SAFE public projects git trees. - safe/jmp/linux-2.6/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 #include <linux/netfilter_bridge.h>
  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 #ifdef CONFIG_BRIDGE_NETFILTER
  32         if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
  33                 br_nf_pre_routing_finish_bridge_slow(skb);
  34                 return NETDEV_TX_OK;
  35         }
  36 #endif
  37
  38         brstats->tx_packets++;
  39         brstats->tx_bytes += skb->len;
  40
  41         BR_INPUT_SKB_CB(skb)->brdev = dev;
  42
  43         skb_reset_mac_header(skb);
  44         skb_pull(skb, ETH_HLEN);
  45
  46         if (dest[0] & 1) {
  47                 if (br_multicast_rcv(br, NULL, skb))
  48                         goto out;
  49
  50                 mdst = br_mdb_get(br, skb);
  51                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  52                         br_multicast_deliver(mdst, skb);
  53                 else
  54                         br_flood_deliver(br, skb);
  55         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  56                 br_deliver(dst->dst, skb);
  57         else
  58                 br_flood_deliver(br, skb);
  59
  60 out:
  61         return NETDEV_TX_OK;
  62 }
  63
  64 static int br_dev_open(struct net_device *dev)
  65 {
  66         struct net_bridge *br = netdev_priv(dev);
  67
  68         br_features_recompute(br);
  69         netif_start_queue(dev);
  70         br_stp_enable_bridge(br);
  71         br_multicast_open(br);
  72
  73         return 0;
  74 }
  75
  76 static void br_dev_set_multicast_list(struct net_device *dev)
  77 {
  78 }
  79
  80 static int br_dev_stop(struct net_device *dev)
  81 {
  82         struct net_bridge *br = netdev_priv(dev);
  83
  84         br_stp_disable_bridge(br);
  85         br_multicast_stop(br);
  86
  87         netif_stop_queue(dev);
  88
  89         return 0;
  90 }
  91
  92 static struct net_device_stats *br_get_stats(struct net_device *dev)
  93 {
  94         struct net_bridge *br = netdev_priv(dev);
  95         struct net_device_stats *stats = &dev->stats;
  96         struct br_cpu_netstats sum = { 0 };
  97         unsigned int cpu;
  98
  99         for_each_possible_cpu(cpu) {
 100                 const struct br_cpu_netstats *bstats
 101                         = per_cpu_ptr(br->stats, cpu);
 102
 103                 sum.tx_bytes   += bstats->tx_bytes;
 104                 sum.tx_packets += bstats->tx_packets;
 105                 sum.rx_bytes   += bstats->rx_bytes;
 106                 sum.rx_packets += bstats->rx_packets;
 107         }
 108
 109         stats->tx_bytes   = sum.tx_bytes;
 110         stats->tx_packets = sum.tx_packets;
 111         stats->rx_bytes   = sum.rx_bytes;
 112         stats->rx_packets = sum.rx_packets;
 113
 114         return stats;
 115 }
 116
 117 static int br_change_mtu(struct net_device *dev, int new_mtu)
 118 {
 119         struct net_bridge *br = netdev_priv(dev);
 120         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 121                 return -EINVAL;
 122
 123         dev->mtu = new_mtu;
 124
 125 #ifdef CONFIG_BRIDGE_NETFILTER
 126         /* remember the MTU in the rtable for PMTU */
 127         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
 128 #endif
 129
 130         return 0;
 131 }
 132
 133 /* Allow setting mac address to any valid ethernet address. */
 134 static int br_set_mac_address(struct net_device *dev, void *p)
 135 {
 136         struct net_bridge *br = netdev_priv(dev);
 137         struct sockaddr *addr = p;
 138
 139         if (!is_valid_ether_addr(addr->sa_data))
 140                 return -EINVAL;
 141
 142         spin_lock_bh(&br->lock);
 143         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 144         br_stp_change_bridge_id(br, addr->sa_data);
 145         br->flags |= BR_SET_MAC_ADDR;
 146         spin_unlock_bh(&br->lock);
 147
 148         return 0;
 149 }
 150
 151 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 152 {
 153         strcpy(info->driver, "bridge");
 154         strcpy(info->version, BR_VERSION);
 155         strcpy(info->fw_version, "N/A");
 156         strcpy(info->bus_info, "N/A");
 157 }
 158
 159 static int br_set_sg(struct net_device *dev, u32 data)
 160 {
 161         struct net_bridge *br = netdev_priv(dev);
 162
 163         if (data)
 164                 br->feature_mask |= NETIF_F_SG;
 165         else
 166                 br->feature_mask &= ~NETIF_F_SG;
 167
 168         br_features_recompute(br);
 169         return 0;
 170 }
 171
 172 static int br_set_tso(struct net_device *dev, u32 data)
 173 {
 174         struct net_bridge *br = netdev_priv(dev);
 175
 176         if (data)
 177                 br->feature_mask |= NETIF_F_TSO;
 178         else
 179                 br->feature_mask &= ~NETIF_F_TSO;
 180
 181         br_features_recompute(br);
 182         return 0;
 183 }
 184
 185 static int br_set_tx_csum(struct net_device *dev, u32 data)
 186 {
 187         struct net_bridge *br = netdev_priv(dev);
 188
 189         if (data)
 190                 br->feature_mask |= NETIF_F_NO_CSUM;
 191         else
 192                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 193
 194         br_features_recompute(br);
 195         return 0;
 196 }
 197
 198 static const struct ethtool_ops br_ethtool_ops = {
 199         .get_drvinfo    = br_getinfo,
 200         .get_link       = ethtool_op_get_link,
 201         .get_tx_csum    = ethtool_op_get_tx_csum,
 202         .set_tx_csum    = br_set_tx_csum,
 203         .get_sg         = ethtool_op_get_sg,
 204         .set_sg         = br_set_sg,
 205         .get_tso        = ethtool_op_get_tso,
 206         .set_tso        = br_set_tso,
 207         .get_ufo        = ethtool_op_get_ufo,
 208         .set_ufo        = ethtool_op_set_ufo,
 209         .get_flags      = ethtool_op_get_flags,
 210 };
 211
 212 static const struct net_device_ops br_netdev_ops = {
 213         .ndo_open                = br_dev_open,
 214         .ndo_stop                = br_dev_stop,
 215         .ndo_start_xmit          = br_dev_xmit,
 216         .ndo_get_stats           = br_get_stats,
 217         .ndo_set_mac_address     = br_set_mac_address,
 218         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 219         .ndo_change_mtu          = br_change_mtu,
 220         .ndo_do_ioctl            = br_dev_ioctl,
 221 };
 222
 223 static void br_dev_free(struct net_device *dev)
 224 {
 225         struct net_bridge *br = netdev_priv(dev);
 226
 227         free_percpu(br->stats);
 228         free_netdev(dev);
 229 }
 230
 231 void br_dev_setup(struct net_device *dev)
 232 {
 233         random_ether_addr(dev->dev_addr);
 234         ether_setup(dev);
 235
 236         dev->netdev_ops = &br_netdev_ops;
 237         dev->destructor = br_dev_free;
 238         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 239         dev->tx_queue_len = 0;
 240         dev->priv_flags = IFF_EBRIDGE;
 241
 242         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 243                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 244                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 245 }