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         struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
  30
  31         brstats->tx_packets++;
  32         brstats->tx_bytes += skb->len;
  33
  34         BR_INPUT_SKB_CB(skb)->brdev = dev;
  35
  36         skb_reset_mac_header(skb);
  37         skb_pull(skb, ETH_HLEN);
  38
  39         if (dest[0] & 1) {
  40                 if (br_multicast_rcv(br, NULL, skb))
  41                         goto out;
  42
  43                 mdst = br_mdb_get(br, skb);
  44                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  45                         br_multicast_deliver(mdst, skb);
  46                 else
  47                         br_flood_deliver(br, skb);
  48         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  49                 br_deliver(dst->dst, skb);
  50         else
  51                 br_flood_deliver(br, skb);
  52
  53 out:
  54         return NETDEV_TX_OK;
  55 }
  56
  57 static int br_dev_open(struct net_device *dev)
  58 {
  59         struct net_bridge *br = netdev_priv(dev);
  60
  61         br_features_recompute(br);
  62         netif_start_queue(dev);
  63         br_stp_enable_bridge(br);
  64         br_multicast_open(br);
  65
  66         return 0;
  67 }
  68
  69 static void br_dev_set_multicast_list(struct net_device *dev)
  70 {
  71 }
  72
  73 static int br_dev_stop(struct net_device *dev)
  74 {
  75         struct net_bridge *br = netdev_priv(dev);
  76
  77         br_stp_disable_bridge(br);
  78         br_multicast_stop(br);
  79
  80         netif_stop_queue(dev);
  81
  82         return 0;
  83 }
  84
  85 static struct net_device_stats *br_get_stats(struct net_device *dev)
  86 {
  87         struct net_bridge *br = netdev_priv(dev);
  88         struct net_device_stats *stats = &dev->stats;
  89         struct br_cpu_netstats sum = { 0 };
  90         unsigned int cpu;
  91
  92         for_each_possible_cpu(cpu) {
  93                 const struct br_cpu_netstats *bstats
  94                         = per_cpu_ptr(br->stats, cpu);
  95
  96                 sum.tx_bytes   += bstats->tx_bytes;
  97                 sum.tx_packets += bstats->tx_packets;
  98                 sum.rx_bytes   += bstats->rx_bytes;
  99                 sum.rx_packets += bstats->rx_packets;
 100         }
 101
 102         stats->tx_bytes   = sum.tx_bytes;
 103         stats->tx_packets = sum.tx_packets;
 104         stats->rx_bytes   = sum.rx_bytes;
 105         stats->rx_packets = sum.rx_packets;
 106
 107         return stats;
 108 }
 109
 110 static int br_change_mtu(struct net_device *dev, int new_mtu)
 111 {
 112         struct net_bridge *br = netdev_priv(dev);
 113         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 114                 return -EINVAL;
 115
 116         dev->mtu = new_mtu;
 117
 118 #ifdef CONFIG_BRIDGE_NETFILTER
 119         /* remember the MTU in the rtable for PMTU */
 120         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
 121 #endif
 122
 123         return 0;
 124 }
 125
 126 /* Allow setting mac address to any valid ethernet address. */
 127 static int br_set_mac_address(struct net_device *dev, void *p)
 128 {
 129         struct net_bridge *br = netdev_priv(dev);
 130         struct sockaddr *addr = p;
 131
 132         if (!is_valid_ether_addr(addr->sa_data))
 133                 return -EINVAL;
 134
 135         spin_lock_bh(&br->lock);
 136         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 137         br_stp_change_bridge_id(br, addr->sa_data);
 138         br->flags |= BR_SET_MAC_ADDR;
 139         spin_unlock_bh(&br->lock);
 140
 141         return 0;
 142 }
 143
 144 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 145 {
 146         strcpy(info->driver, "bridge");
 147         strcpy(info->version, BR_VERSION);
 148         strcpy(info->fw_version, "N/A");
 149         strcpy(info->bus_info, "N/A");
 150 }
 151
 152 static int br_set_sg(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_SG;
 158         else
 159                 br->feature_mask &= ~NETIF_F_SG;
 160
 161         br_features_recompute(br);
 162         return 0;
 163 }
 164
 165 static int br_set_tso(struct net_device *dev, u32 data)
 166 {
 167         struct net_bridge *br = netdev_priv(dev);
 168
 169         if (data)
 170                 br->feature_mask |= NETIF_F_TSO;
 171         else
 172                 br->feature_mask &= ~NETIF_F_TSO;
 173
 174         br_features_recompute(br);
 175         return 0;
 176 }
 177
 178 static int br_set_tx_csum(struct net_device *dev, u32 data)
 179 {
 180         struct net_bridge *br = netdev_priv(dev);
 181
 182         if (data)
 183                 br->feature_mask |= NETIF_F_NO_CSUM;
 184         else
 185                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 186
 187         br_features_recompute(br);
 188         return 0;
 189 }
 190
 191 static const struct ethtool_ops br_ethtool_ops = {
 192         .get_drvinfo    = br_getinfo,
 193         .get_link       = ethtool_op_get_link,
 194         .get_tx_csum    = ethtool_op_get_tx_csum,
 195         .set_tx_csum    = br_set_tx_csum,
 196         .get_sg         = ethtool_op_get_sg,
 197         .set_sg         = br_set_sg,
 198         .get_tso        = ethtool_op_get_tso,
 199         .set_tso        = br_set_tso,
 200         .get_ufo        = ethtool_op_get_ufo,
 201         .set_ufo        = ethtool_op_set_ufo,
 202         .get_flags      = ethtool_op_get_flags,
 203 };
 204
 205 static const struct net_device_ops br_netdev_ops = {
 206         .ndo_open                = br_dev_open,
 207         .ndo_stop                = br_dev_stop,
 208         .ndo_start_xmit          = br_dev_xmit,
 209         .ndo_get_stats           = br_get_stats,
 210         .ndo_set_mac_address     = br_set_mac_address,
 211         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 212         .ndo_change_mtu          = br_change_mtu,
 213         .ndo_do_ioctl            = br_dev_ioctl,
 214 };
 215
 216 static void br_dev_free(struct net_device *dev)
 217 {
 218         struct net_bridge *br = netdev_priv(dev);
 219
 220         free_percpu(br->stats);
 221         free_netdev(dev);
 222 }
 223
 224 void br_dev_setup(struct net_device *dev)
 225 {
 226         random_ether_addr(dev->dev_addr);
 227         ether_setup(dev);
 228
 229         dev->netdev_ops = &br_netdev_ops;
 230         dev->destructor = br_dev_free;
 231         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 232         dev->tx_queue_len = 0;
 233         dev->priv_flags = IFF_EBRIDGE;
 234
 235         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 236                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 237                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 238 }