linux/net/bridge/br_device.c
<<
>>
Prefs
   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#include <linux/netfilter_bridge.h>
  21
  22#include <asm/uaccess.h>
  23#include "br_private.h"
  24
  25/* net device transmit always called with no BH (preempt_disabled) */
  26netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  27{
  28        struct net_bridge *br = netdev_priv(dev);
  29        const unsigned char *dest = skb->data;
  30        struct net_bridge_fdb_entry *dst;
  31        struct net_bridge_mdb_entry *mdst;
  32        struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
  33
  34#ifdef CONFIG_BRIDGE_NETFILTER
  35        if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
  36                br_nf_pre_routing_finish_bridge_slow(skb);
  37                return NETDEV_TX_OK;
  38        }
  39#endif
  40
  41        brstats->tx_packets++;
  42        brstats->tx_bytes += skb->len;
  43
  44        BR_INPUT_SKB_CB(skb)->brdev = dev;
  45
  46        skb_reset_mac_header(skb);
  47        skb_pull(skb, ETH_HLEN);
  48
  49        if (is_multicast_ether_addr(dest)) {
  50                if (br_multicast_rcv(br, NULL, skb))
  51                        goto out;
  52
  53                mdst = br_mdb_get(br, skb);
  54                if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  55                        br_multicast_deliver(mdst, skb);
  56                else
  57                        br_flood_deliver(br, skb);
  58        } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  59                br_deliver(dst->dst, skb);
  60        else
  61                br_flood_deliver(br, skb);
  62
  63out:
  64        return NETDEV_TX_OK;
  65}
  66
  67static int br_dev_open(struct net_device *dev)
  68{
  69        struct net_bridge *br = netdev_priv(dev);
  70
  71        br_features_recompute(br);
  72        netif_start_queue(dev);
  73        br_stp_enable_bridge(br);
  74        br_multicast_open(br);
  75
  76        return 0;
  77}
  78
  79static void br_dev_set_multicast_list(struct net_device *dev)
  80{
  81}
  82
  83static int br_dev_stop(struct net_device *dev)
  84{
  85        struct net_bridge *br = netdev_priv(dev);
  86
  87        br_stp_disable_bridge(br);
  88        br_multicast_stop(br);
  89
  90        netif_stop_queue(dev);
  91
  92        return 0;
  93}
  94
  95static struct net_device_stats *br_get_stats(struct net_device *dev)
  96{
  97        struct net_bridge *br = netdev_priv(dev);
  98        struct net_device_stats *stats = &dev->stats;
  99        struct br_cpu_netstats sum = { 0 };
 100        unsigned int cpu;
 101
 102        for_each_possible_cpu(cpu) {
 103                const struct br_cpu_netstats *bstats
 104                        = per_cpu_ptr(br->stats, cpu);
 105
 106                sum.tx_bytes   += bstats->tx_bytes;
 107                sum.tx_packets += bstats->tx_packets;
 108                sum.rx_bytes   += bstats->rx_bytes;
 109                sum.rx_packets += bstats->rx_packets;
 110        }
 111
 112        stats->tx_bytes   = sum.tx_bytes;
 113        stats->tx_packets = sum.tx_packets;
 114        stats->rx_bytes   = sum.rx_bytes;
 115        stats->rx_packets = sum.rx_packets;
 116
 117        return stats;
 118}
 119
 120static int br_change_mtu(struct net_device *dev, int new_mtu)
 121{
 122        struct net_bridge *br = netdev_priv(dev);
 123        if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 124                return -EINVAL;
 125
 126        dev->mtu = new_mtu;
 127
 128#ifdef CONFIG_BRIDGE_NETFILTER
 129        /* remember the MTU in the rtable for PMTU */
 130        br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
 131#endif
 132
 133        return 0;
 134}
 135
 136/* Allow setting mac address to any valid ethernet address. */
 137static int br_set_mac_address(struct net_device *dev, void *p)
 138{
 139        struct net_bridge *br = netdev_priv(dev);
 140        struct sockaddr *addr = p;
 141
 142        if (!is_valid_ether_addr(addr->sa_data))
 143                return -EINVAL;
 144
 145        spin_lock_bh(&br->lock);
 146        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 147        br_stp_change_bridge_id(br, addr->sa_data);
 148        br->flags |= BR_SET_MAC_ADDR;
 149        spin_unlock_bh(&br->lock);
 150
 151        return 0;
 152}
 153
 154static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 155{
 156        strcpy(info->driver, "bridge");
 157        strcpy(info->version, BR_VERSION);
 158        strcpy(info->fw_version, "N/A");
 159        strcpy(info->bus_info, "N/A");
 160}
 161
 162static int br_set_sg(struct net_device *dev, u32 data)
 163{
 164        struct net_bridge *br = netdev_priv(dev);
 165
 166        if (data)
 167                br->feature_mask |= NETIF_F_SG;
 168        else
 169                br->feature_mask &= ~NETIF_F_SG;
 170
 171        br_features_recompute(br);
 172        return 0;
 173}
 174
 175static int br_set_tso(struct net_device *dev, u32 data)
 176{
 177        struct net_bridge *br = netdev_priv(dev);
 178
 179        if (data)
 180                br->feature_mask |= NETIF_F_TSO;
 181        else
 182                br->feature_mask &= ~NETIF_F_TSO;
 183
 184        br_features_recompute(br);
 185        return 0;
 186}
 187
 188static int br_set_tx_csum(struct net_device *dev, u32 data)
 189{
 190        struct net_bridge *br = netdev_priv(dev);
 191
 192        if (data)
 193                br->feature_mask |= NETIF_F_NO_CSUM;
 194        else
 195                br->feature_mask &= ~NETIF_F_ALL_CSUM;
 196
 197        br_features_recompute(br);
 198        return 0;
 199}
 200
 201#ifdef CONFIG_NET_POLL_CONTROLLER
 202static bool br_devices_support_netpoll(struct net_bridge *br)
 203{
 204        struct net_bridge_port *p;
 205        bool ret = true;
 206        int count = 0;
 207        unsigned long flags;
 208
 209        spin_lock_irqsave(&br->lock, flags);
 210        list_for_each_entry(p, &br->port_list, list) {
 211                count++;
 212                if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
 213                    !p->dev->netdev_ops->ndo_poll_controller)
 214                        ret = false;
 215        }
 216        spin_unlock_irqrestore(&br->lock, flags);
 217        return count != 0 && ret;
 218}
 219
 220void br_netpoll_cleanup(struct net_device *dev)
 221{
 222        struct net_bridge *br = netdev_priv(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
 238void br_netpoll_disable(struct net_bridge *br,
 239                        struct net_device *dev)
 240{
 241        if (br_devices_support_netpoll(br))
 242                br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
 243        if (dev->netdev_ops->ndo_netpoll_cleanup)
 244                dev->netdev_ops->ndo_netpoll_cleanup(dev);
 245        else
 246                dev->npinfo = NULL;
 247}
 248
 249void br_netpoll_enable(struct net_bridge *br,
 250                       struct net_device *dev)
 251{
 252        if (br_devices_support_netpoll(br)) {
 253                br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
 254                if (br->dev->npinfo)
 255                        dev->npinfo = br->dev->npinfo;
 256        } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
 257                br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
 258                br_info(br,"new device %s does not support netpoll (disabling)",
 259                        dev->name);
 260        }
 261}
 262
 263#endif
 264
 265static const struct ethtool_ops br_ethtool_ops = {
 266        .get_drvinfo    = br_getinfo,
 267        .get_link       = ethtool_op_get_link,
 268        .get_tx_csum    = ethtool_op_get_tx_csum,
 269        .set_tx_csum    = br_set_tx_csum,
 270        .get_sg         = ethtool_op_get_sg,
 271        .set_sg         = br_set_sg,
 272        .get_tso        = ethtool_op_get_tso,
 273        .set_tso        = br_set_tso,
 274        .get_ufo        = ethtool_op_get_ufo,
 275        .set_ufo        = ethtool_op_set_ufo,
 276        .get_flags      = ethtool_op_get_flags,
 277};
 278
 279static const struct net_device_ops br_netdev_ops = {
 280        .ndo_open                = br_dev_open,
 281        .ndo_stop                = br_dev_stop,
 282        .ndo_start_xmit          = br_dev_xmit,
 283        .ndo_get_stats           = br_get_stats,
 284        .ndo_set_mac_address     = br_set_mac_address,
 285        .ndo_set_multicast_list  = br_dev_set_multicast_list,
 286        .ndo_change_mtu          = br_change_mtu,
 287        .ndo_do_ioctl            = br_dev_ioctl,
 288#ifdef CONFIG_NET_POLL_CONTROLLER
 289        .ndo_netpoll_cleanup     = br_netpoll_cleanup,
 290#endif
 291};
 292
 293static void br_dev_free(struct net_device *dev)
 294{
 295        struct net_bridge *br = netdev_priv(dev);
 296
 297        free_percpu(br->stats);
 298        free_netdev(dev);
 299}
 300
 301void br_dev_setup(struct net_device *dev)
 302{
 303        random_ether_addr(dev->dev_addr);
 304        ether_setup(dev);
 305
 306        dev->netdev_ops = &br_netdev_ops;
 307        dev->destructor = br_dev_free;
 308        SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 309        dev->tx_queue_len = 0;
 310        dev->priv_flags = IFF_EBRIDGE;
 311
 312        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 313                        NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 314                        NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 315}
 316