linux/net/bridge/br_device.c
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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#include <linux/netfilter_bridge.h>
  21
  22#include <asm/uaccess.h>
  23#include "br_private.h"
  24
  25/* net device transmit always called with BH 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        rcu_read_lock();
  35#ifdef CONFIG_BRIDGE_NETFILTER
  36        if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
  37                br_nf_pre_routing_finish_bridge_slow(skb);
  38                rcu_read_unlock();
  39                return NETDEV_TX_OK;
  40        }
  41#endif
  42
  43        u64_stats_update_begin(&brstats->syncp);
  44        brstats->tx_packets++;
  45        brstats->tx_bytes += skb->len;
  46        u64_stats_update_end(&brstats->syncp);
  47
  48        BR_INPUT_SKB_CB(skb)->brdev = dev;
  49
  50        skb_reset_mac_header(skb);
  51        skb_pull(skb, ETH_HLEN);
  52
  53        if (is_broadcast_ether_addr(dest))
  54                br_flood_deliver(br, skb);
  55        else if (is_multicast_ether_addr(dest)) {
  56                if (unlikely(netpoll_tx_running(dev))) {
  57                        br_flood_deliver(br, skb);
  58                        goto out;
  59                }
  60                if (br_multicast_rcv(br, NULL, skb)) {
  61                        kfree_skb(skb);
  62                        goto out;
  63                }
  64
  65                mdst = br_mdb_get(br, skb);
  66                if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  67                        br_multicast_deliver(mdst, skb);
  68                else
  69                        br_flood_deliver(br, skb);
  70        } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  71                br_deliver(dst->dst, skb);
  72        else
  73                br_flood_deliver(br, skb);
  74
  75out:
  76        rcu_read_unlock();
  77        return NETDEV_TX_OK;
  78}
  79
  80static int br_dev_init(struct net_device *dev)
  81{
  82        struct net_bridge *br = netdev_priv(dev);
  83
  84        br->stats = alloc_percpu(struct br_cpu_netstats);
  85        if (!br->stats)
  86                return -ENOMEM;
  87
  88        return 0;
  89}
  90
  91static int br_dev_open(struct net_device *dev)
  92{
  93        struct net_bridge *br = netdev_priv(dev);
  94
  95        netdev_update_features(dev);
  96        netif_start_queue(dev);
  97        br_stp_enable_bridge(br);
  98        br_multicast_open(br);
  99
 100        return 0;
 101}
 102
 103static void br_dev_set_multicast_list(struct net_device *dev)
 104{
 105}
 106
 107static int br_dev_stop(struct net_device *dev)
 108{
 109        struct net_bridge *br = netdev_priv(dev);
 110
 111        br_stp_disable_bridge(br);
 112        br_multicast_stop(br);
 113
 114        netif_stop_queue(dev);
 115
 116        return 0;
 117}
 118
 119static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
 120                                                struct rtnl_link_stats64 *stats)
 121{
 122        struct net_bridge *br = netdev_priv(dev);
 123        struct br_cpu_netstats tmp, sum = { 0 };
 124        unsigned int cpu;
 125
 126        for_each_possible_cpu(cpu) {
 127                unsigned int start;
 128                const struct br_cpu_netstats *bstats
 129                        = per_cpu_ptr(br->stats, cpu);
 130                do {
 131                        start = u64_stats_fetch_begin_bh(&bstats->syncp);
 132                        memcpy(&tmp, bstats, sizeof(tmp));
 133                } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
 134                sum.tx_bytes   += tmp.tx_bytes;
 135                sum.tx_packets += tmp.tx_packets;
 136                sum.rx_bytes   += tmp.rx_bytes;
 137                sum.rx_packets += tmp.rx_packets;
 138        }
 139
 140        stats->tx_bytes   = sum.tx_bytes;
 141        stats->tx_packets = sum.tx_packets;
 142        stats->rx_bytes   = sum.rx_bytes;
 143        stats->rx_packets = sum.rx_packets;
 144
 145        return stats;
 146}
 147
 148static int br_change_mtu(struct net_device *dev, int new_mtu)
 149{
 150        struct net_bridge *br = netdev_priv(dev);
 151        if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 152                return -EINVAL;
 153
 154        dev->mtu = new_mtu;
 155
 156#ifdef CONFIG_BRIDGE_NETFILTER
 157        /* remember the MTU in the rtable for PMTU */
 158        dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
 159#endif
 160
 161        return 0;
 162}
 163
 164/* Allow setting mac address to any valid ethernet address. */
 165static int br_set_mac_address(struct net_device *dev, void *p)
 166{
 167        struct net_bridge *br = netdev_priv(dev);
 168        struct sockaddr *addr = p;
 169
 170        if (!is_valid_ether_addr(addr->sa_data))
 171                return -EADDRNOTAVAIL;
 172
 173        spin_lock_bh(&br->lock);
 174        if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
 175                dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 176                memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 177                br_fdb_change_mac_address(br, addr->sa_data);
 178                br_stp_change_bridge_id(br, addr->sa_data);
 179        }
 180        br->flags |= BR_SET_MAC_ADDR;
 181        spin_unlock_bh(&br->lock);
 182
 183        return 0;
 184}
 185
 186static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 187{
 188        strcpy(info->driver, "bridge");
 189        strcpy(info->version, BR_VERSION);
 190        strcpy(info->fw_version, "N/A");
 191        strcpy(info->bus_info, "N/A");
 192}
 193
 194static netdev_features_t br_fix_features(struct net_device *dev,
 195        netdev_features_t features)
 196{
 197        struct net_bridge *br = netdev_priv(dev);
 198
 199        return br_features_recompute(br, features);
 200}
 201
 202#ifdef CONFIG_NET_POLL_CONTROLLER
 203static void br_poll_controller(struct net_device *br_dev)
 204{
 205}
 206
 207static void br_netpoll_cleanup(struct net_device *dev)
 208{
 209        struct net_bridge *br = netdev_priv(dev);
 210        struct net_bridge_port *p;
 211
 212        list_for_each_entry(p, &br->port_list, list)
 213                br_netpoll_disable(p);
 214}
 215
 216static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
 217                            gfp_t gfp)
 218{
 219        struct net_bridge *br = netdev_priv(dev);
 220        struct net_bridge_port *p;
 221        int err = 0;
 222
 223        list_for_each_entry(p, &br->port_list, list) {
 224                if (!p->dev)
 225                        continue;
 226                err = br_netpoll_enable(p, gfp);
 227                if (err)
 228                        goto fail;
 229        }
 230
 231out:
 232        return err;
 233
 234fail:
 235        br_netpoll_cleanup(dev);
 236        goto out;
 237}
 238
 239int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 240{
 241        struct netpoll *np;
 242        int err = 0;
 243
 244        np = kzalloc(sizeof(*p->np), gfp);
 245        err = -ENOMEM;
 246        if (!np)
 247                goto out;
 248
 249        err = __netpoll_setup(np, p->dev, gfp);
 250        if (err) {
 251                kfree(np);
 252                goto out;
 253        }
 254
 255        p->np = np;
 256
 257out:
 258        return err;
 259}
 260
 261void br_netpoll_disable(struct net_bridge_port *p)
 262{
 263        struct netpoll *np = p->np;
 264
 265        if (!np)
 266                return;
 267
 268        p->np = NULL;
 269
 270        __netpoll_free_rcu(np);
 271}
 272
 273#endif
 274
 275static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
 276
 277{
 278        struct net_bridge *br = netdev_priv(dev);
 279
 280        return br_add_if(br, slave_dev);
 281}
 282
 283static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
 284{
 285        struct net_bridge *br = netdev_priv(dev);
 286
 287        return br_del_if(br, slave_dev);
 288}
 289
 290static const struct ethtool_ops br_ethtool_ops = {
 291        .get_drvinfo    = br_getinfo,
 292        .get_link       = ethtool_op_get_link,
 293};
 294
 295static const struct net_device_ops br_netdev_ops = {
 296        .ndo_open                = br_dev_open,
 297        .ndo_stop                = br_dev_stop,
 298        .ndo_init                = br_dev_init,
 299        .ndo_start_xmit          = br_dev_xmit,
 300        .ndo_get_stats64         = br_get_stats64,
 301        .ndo_set_mac_address     = br_set_mac_address,
 302        .ndo_set_rx_mode         = br_dev_set_multicast_list,
 303        .ndo_change_mtu          = br_change_mtu,
 304        .ndo_do_ioctl            = br_dev_ioctl,
 305#ifdef CONFIG_NET_POLL_CONTROLLER
 306        .ndo_netpoll_setup       = br_netpoll_setup,
 307        .ndo_netpoll_cleanup     = br_netpoll_cleanup,
 308        .ndo_poll_controller     = br_poll_controller,
 309#endif
 310        .ndo_add_slave           = br_add_slave,
 311        .ndo_del_slave           = br_del_slave,
 312        .ndo_fix_features        = br_fix_features,
 313        .ndo_fdb_add             = br_fdb_add,
 314        .ndo_fdb_del             = br_fdb_delete,
 315        .ndo_fdb_dump            = br_fdb_dump,
 316};
 317
 318static void br_dev_free(struct net_device *dev)
 319{
 320        struct net_bridge *br = netdev_priv(dev);
 321
 322        free_percpu(br->stats);
 323        free_netdev(dev);
 324}
 325
 326static struct device_type br_type = {
 327        .name   = "bridge",
 328};
 329
 330void br_dev_setup(struct net_device *dev)
 331{
 332        struct net_bridge *br = netdev_priv(dev);
 333
 334        eth_hw_addr_random(dev);
 335        ether_setup(dev);
 336
 337        dev->netdev_ops = &br_netdev_ops;
 338        dev->destructor = br_dev_free;
 339        SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 340        SET_NETDEV_DEVTYPE(dev, &br_type);
 341        dev->tx_queue_len = 0;
 342        dev->priv_flags = IFF_EBRIDGE;
 343
 344        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 345                        NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
 346                        NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
 347        dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 348                           NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
 349                           NETIF_F_HW_VLAN_TX;
 350
 351        br->dev = dev;
 352        spin_lock_init(&br->lock);
 353        INIT_LIST_HEAD(&br->port_list);
 354        spin_lock_init(&br->hash_lock);
 355
 356        br->bridge_id.prio[0] = 0x80;
 357        br->bridge_id.prio[1] = 0x00;
 358
 359        memcpy(br->group_addr, br_group_address, ETH_ALEN);
 360
 361        br->stp_enabled = BR_NO_STP;
 362        br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
 363
 364        br->designated_root = br->bridge_id;
 365        br->bridge_max_age = br->max_age = 20 * HZ;
 366        br->bridge_hello_time = br->hello_time = 2 * HZ;
 367        br->bridge_forward_delay = br->forward_delay = 15 * HZ;
 368        br->ageing_time = 300 * HZ;
 369
 370        br_netfilter_rtable_init(br);
 371        br_stp_timer_init(br);
 372        br_multicast_init(br);
 373}
 374
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