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   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/netpoll.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/ethtool.h>
  19 #include <linux/list.h>
  20
  21 #include <asm/uaccess.h>
  22 #include "br_private.h"
  23
  24 /* net device transmit always called with no BH (preempt_disabled) */
  25 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  26 {
  27         struct net_bridge *br = netdev_priv(dev);
  28         const unsigned char *dest = skb->data;
  29         struct net_bridge_fdb_entry *dst;
  30         struct net_bridge_mdb_entry *mdst;
  31         struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
  32
  33         brstats->tx_packets++;
  34         brstats->tx_bytes += skb->len;
  35
  36         BR_INPUT_SKB_CB(skb)->brdev = dev;
  37
  38         skb_reset_mac_header(skb);
  39         skb_pull(skb, ETH_HLEN);
  40
  41         if (is_multicast_ether_addr(dest)) {
  42                 if (br_multicast_rcv(br, NULL, skb))
  43                         goto out;
  44
  45                 mdst = br_mdb_get(br, skb);
  46                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  47                         br_multicast_deliver(mdst, skb);
  48                 else
  49                         br_flood_deliver(br, skb);
  50         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  51                 br_deliver(dst->dst, skb);
  52         else
  53                 br_flood_deliver(br, skb);
  54
  55 out:
  56         return NETDEV_TX_OK;
  57 }
  58
  59 static int br_dev_open(struct net_device *dev)
  60 {
  61         struct net_bridge *br = netdev_priv(dev);
  62
  63         br_features_recompute(br);
  64         netif_start_queue(dev);
  65         br_stp_enable_bridge(br);
  66         br_multicast_open(br);
  67
  68         return 0;
  69 }
  70
  71 static void br_dev_set_multicast_list(struct net_device *dev)
  72 {
  73 }
  74
  75 static int br_dev_stop(struct net_device *dev)
  76 {
  77         struct net_bridge *br = netdev_priv(dev);
  78
  79         br_stp_disable_bridge(br);
  80         br_multicast_stop(br);
  81
  82         netif_stop_queue(dev);
  83
  84         return 0;
  85 }
  86
  87 static struct net_device_stats *br_get_stats(struct net_device *dev)
  88 {
  89         struct net_bridge *br = netdev_priv(dev);
  90         struct net_device_stats *stats = &dev->stats;
  91         struct br_cpu_netstats sum = { 0 };
  92         unsigned int cpu;
  93
  94         for_each_possible_cpu(cpu) {
  95                 const struct br_cpu_netstats *bstats
  96                         = per_cpu_ptr(br->stats, cpu);
  97
  98                 sum.tx_bytes   += bstats->tx_bytes;
  99                 sum.tx_packets += bstats->tx_packets;
 100                 sum.rx_bytes   += bstats->rx_bytes;
 101                 sum.rx_packets += bstats->rx_packets;
 102         }
 103
 104         stats->tx_bytes   = sum.tx_bytes;
 105         stats->tx_packets = sum.tx_packets;
 106         stats->rx_bytes   = sum.rx_bytes;
 107         stats->rx_packets = sum.rx_packets;
 108
 109         return stats;
 110 }
 111
 112 static int br_change_mtu(struct net_device *dev, int new_mtu)
 113 {
 114         struct net_bridge *br = netdev_priv(dev);
 115         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 116                 return -EINVAL;
 117
 118         dev->mtu = new_mtu;
 119
 120 #ifdef CONFIG_BRIDGE_NETFILTER
 121         /* remember the MTU in the rtable for PMTU */
 122         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
 123 #endif
 124
 125         return 0;
 126 }
 127
 128 /* Allow setting mac address to any valid ethernet address. */
 129 static int br_set_mac_address(struct net_device *dev, void *p)
 130 {
 131         struct net_bridge *br = netdev_priv(dev);
 132         struct sockaddr *addr = p;
 133
 134         if (!is_valid_ether_addr(addr->sa_data))
 135                 return -EINVAL;
 136
 137         spin_lock_bh(&br->lock);
 138         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 139         br_stp_change_bridge_id(br, addr->sa_data);
 140         br->flags |= BR_SET_MAC_ADDR;
 141         spin_unlock_bh(&br->lock);
 142
 143         return 0;
 144 }
 145
 146 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 147 {
 148         strcpy(info->driver, "bridge");
 149         strcpy(info->version, BR_VERSION);
 150         strcpy(info->fw_version, "N/A");
 151         strcpy(info->bus_info, "N/A");
 152 }
 153
 154 static int br_set_sg(struct net_device *dev, u32 data)
 155 {
 156         struct net_bridge *br = netdev_priv(dev);
 157
 158         if (data)
 159                 br->feature_mask |= NETIF_F_SG;
 160         else
 161                 br->feature_mask &= ~NETIF_F_SG;
 162
 163         br_features_recompute(br);
 164         return 0;
 165 }
 166
 167 static int br_set_tso(struct net_device *dev, u32 data)
 168 {
 169         struct net_bridge *br = netdev_priv(dev);
 170
 171         if (data)
 172                 br->feature_mask |= NETIF_F_TSO;
 173         else
 174                 br->feature_mask &= ~NETIF_F_TSO;
 175
 176         br_features_recompute(br);
 177         return 0;
 178 }
 179
 180 static int br_set_tx_csum(struct net_device *dev, u32 data)
 181 {
 182         struct net_bridge *br = netdev_priv(dev);
 183
 184         if (data)
 185                 br->feature_mask |= NETIF_F_NO_CSUM;
 186         else
 187                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 188
 189         br_features_recompute(br);
 190         return 0;
 191 }
 192
 193 #ifdef CONFIG_NET_POLL_CONTROLLER
 194 bool br_devices_support_netpoll(struct net_bridge *br)
 195 {
 196         struct net_bridge_port *p;
 197         bool ret = true;
 198         int count = 0;
 199         unsigned long flags;
 200
 201         spin_lock_irqsave(&br->lock, flags);
 202         list_for_each_entry(p, &br->port_list, list) {
 203                 count++;
 204                 if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
 205                     !p->dev->netdev_ops->ndo_poll_controller)
 206                         ret = false;
 207         }
 208         spin_unlock_irqrestore(&br->lock, flags);
 209         return count != 0 && ret;
 210 }
 211
 212 static void br_poll_controller(struct net_device *br_dev)
 213 {
 214         struct netpoll *np = br_dev->npinfo->netpoll;
 215
 216         if (np->real_dev != br_dev)
 217                 netpoll_poll_dev(np->real_dev);
 218 }
 219
 220 void br_netpoll_cleanup(struct net_device *br_dev)
 221 {
 222         struct net_bridge *br = netdev_priv(br_dev);
 223         struct net_bridge_port *p, *n;
 224         const struct net_device_ops *ops;
 225
 226         br->dev->npinfo = NULL;
 227         list_for_each_entry_safe(p, n, &br->port_list, list) {
 228                 if (p->dev) {
 229                         ops = p->dev->netdev_ops;
 230                         if (ops->ndo_netpoll_cleanup)
 231                                 ops->ndo_netpoll_cleanup(p->dev);
 232                         else
 233                                 p->dev->npinfo = NULL;
 234                 }
 235         }
 236 }
 237
 238 #else
 239
 240 void br_netpoll_cleanup(struct net_device *br_dev)
 241 {
 242 }
 243
 244 #endif
 245
 246 static const struct ethtool_ops br_ethtool_ops = {
 247         .get_drvinfo    = br_getinfo,
 248         .get_link       = ethtool_op_get_link,
 249         .get_tx_csum    = ethtool_op_get_tx_csum,
 250         .set_tx_csum    = br_set_tx_csum,
 251         .get_sg         = ethtool_op_get_sg,
 252         .set_sg         = br_set_sg,
 253         .get_tso        = ethtool_op_get_tso,
 254         .set_tso        = br_set_tso,
 255         .get_ufo        = ethtool_op_get_ufo,
 256         .set_ufo        = ethtool_op_set_ufo,
 257         .get_flags      = ethtool_op_get_flags,
 258 };
 259
 260 static const struct net_device_ops br_netdev_ops = {
 261         .ndo_open                = br_dev_open,
 262         .ndo_stop                = br_dev_stop,
 263         .ndo_start_xmit          = br_dev_xmit,
 264         .ndo_get_stats           = br_get_stats,
 265         .ndo_set_mac_address     = br_set_mac_address,
 266         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 267         .ndo_change_mtu          = br_change_mtu,
 268         .ndo_do_ioctl            = br_dev_ioctl,
 269 #ifdef CONFIG_NET_POLL_CONTROLLER
 270         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
 271         .ndo_poll_controller     = br_poll_controller,
 272 #endif
 273 };
 274
 275 static void br_dev_free(struct net_device *dev)
 276 {
 277         struct net_bridge *br = netdev_priv(dev);
 278
 279         free_percpu(br->stats);
 280         free_netdev(dev);
 281 }
 282
 283 void br_dev_setup(struct net_device *dev)
 284 {
 285         random_ether_addr(dev->dev_addr);
 286         ether_setup(dev);
 287
 288         dev->netdev_ops = &br_netdev_ops;
 289         dev->destructor = br_dev_free;
 290         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 291         dev->tx_queue_len = 0;
 292         dev->priv_flags = IFF_EBRIDGE;
 293
 294         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 295                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 296                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 297 }