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#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        u64_stats_update_begin(&brstats->syncp);
  42        brstats->tx_packets++;
  43        brstats->tx_bytes += skb->len;
  44        u64_stats_update_end(&brstats->syncp);
  45
  46        BR_INPUT_SKB_CB(skb)->brdev = dev;
  47
  48        skb_reset_mac_header(skb);
  49        skb_pull(skb, ETH_HLEN);
  50
  51        rcu_read_lock();
  52        if (is_broadcast_ether_addr(dest))
  53                br_flood_deliver(br, skb);
  54        else if (is_multicast_ether_addr(dest)) {
  55                if (unlikely(netpoll_tx_running(dev))) {
  56                        br_flood_deliver(br, skb);
  57                        goto out;
  58                }
  59                if (br_multicast_rcv(br, NULL, skb)) {
  60                        kfree_skb(skb);
  61                        goto out;
  62                }
  63
  64                mdst = br_mdb_get(br, skb);
  65                if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  66                        br_multicast_deliver(mdst, skb);
  67                else
  68                        br_flood_deliver(br, skb);
  69        } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  70                br_deliver(dst->dst, skb);
  71        else
  72                br_flood_deliver(br, skb);
  73
  74out:
  75        rcu_read_unlock();
  76        return NETDEV_TX_OK;
  77}
  78
  79static int br_dev_init(struct net_device *dev)
  80{
  81        struct net_bridge *br = netdev_priv(dev);
  82
  83        br->stats = alloc_percpu(struct br_cpu_netstats);
  84        if (!br->stats)
  85                return -ENOMEM;
  86
  87        return 0;
  88}
  89
  90static int br_dev_open(struct net_device *dev)
  91{
  92        struct net_bridge *br = netdev_priv(dev);
  93
  94        netdev_update_features(dev);
  95        netif_start_queue(dev);
  96        br_stp_enable_bridge(br);
  97        br_multicast_open(br);
  98
  99        return 0;
 100}
 101
 102static void br_dev_set_multicast_list(struct net_device *dev)
 103{
 104}
 105
 106static int br_dev_stop(struct net_device *dev)
 107{
 108        struct net_bridge *br = netdev_priv(dev);
 109
 110        br_stp_disable_bridge(br);
 111        br_multicast_stop(br);
 112
 113        netif_stop_queue(dev);
 114
 115        return 0;
 116}
 117
 118static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
 119                                                struct rtnl_link_stats64 *stats)
 120{
 121        struct net_bridge *br = netdev_priv(dev);
 122        struct br_cpu_netstats tmp, sum = { 0 };
 123        unsigned int cpu;
 124
 125        for_each_possible_cpu(cpu) {
 126                unsigned int start;
 127                const struct br_cpu_netstats *bstats
 128                        = per_cpu_ptr(br->stats, cpu);
 129                do {
 130                        start = u64_stats_fetch_begin(&bstats->syncp);
 131                        memcpy(&tmp, bstats, sizeof(tmp));
 132                } while (u64_stats_fetch_retry(&bstats->syncp, start));
 133                sum.tx_bytes   += tmp.tx_bytes;
 134                sum.tx_packets += tmp.tx_packets;
 135                sum.rx_bytes   += tmp.rx_bytes;
 136                sum.rx_packets += tmp.rx_packets;
 137        }
 138
 139        stats->tx_bytes   = sum.tx_bytes;
 140        stats->tx_packets = sum.tx_packets;
 141        stats->rx_bytes   = sum.rx_bytes;
 142        stats->rx_packets = sum.rx_packets;
 143
 144        return stats;
 145}
 146
 147static int br_change_mtu(struct net_device *dev, int new_mtu)
 148{
 149        struct net_bridge *br = netdev_priv(dev);
 150        if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 151                return -EINVAL;
 152
 153        dev->mtu = new_mtu;
 154
 155#ifdef CONFIG_BRIDGE_NETFILTER
 156        /* remember the MTU in the rtable for PMTU */
 157        dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
 158#endif
 159
 160        return 0;
 161}
 162
 163/* Allow setting mac address to any valid ethernet address. */
 164static int br_set_mac_address(struct net_device *dev, void *p)
 165{
 166        struct net_bridge *br = netdev_priv(dev);
 167        struct sockaddr *addr = p;
 168
 169        if (!is_valid_ether_addr(addr->sa_data))
 170                return -EINVAL;
 171
 172        spin_lock_bh(&br->lock);
 173        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 174        br_stp_change_bridge_id(br, addr->sa_data);
 175        br->flags |= BR_SET_MAC_ADDR;
 176        spin_unlock_bh(&br->lock);
 177
 178        return 0;
 179}
 180
 181static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 182{
 183        strcpy(info->driver, "bridge");
 184        strcpy(info->version, BR_VERSION);
 185        strcpy(info->fw_version, "N/A");
 186        strcpy(info->bus_info, "N/A");
 187}
 188
 189static u32 br_fix_features(struct net_device *dev, u32 features)
 190{
 191        struct net_bridge *br = netdev_priv(dev);
 192
 193        return br_features_recompute(br, features);
 194}
 195
 196#ifdef CONFIG_NET_POLL_CONTROLLER
 197static void br_poll_controller(struct net_device *br_dev)
 198{
 199}
 200
 201static void br_netpoll_cleanup(struct net_device *dev)
 202{
 203        struct net_bridge *br = netdev_priv(dev);
 204        struct net_bridge_port *p, *n;
 205
 206        list_for_each_entry_safe(p, n, &br->port_list, list) {
 207                br_netpoll_disable(p);
 208        }
 209}
 210
 211static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
 212{
 213        struct net_bridge *br = netdev_priv(dev);
 214        struct net_bridge_port *p, *n;
 215        int err = 0;
 216
 217        list_for_each_entry_safe(p, n, &br->port_list, list) {
 218                if (!p->dev)
 219                        continue;
 220
 221                err = br_netpoll_enable(p);
 222                if (err)
 223                        goto fail;
 224        }
 225
 226out:
 227        return err;
 228
 229fail:
 230        br_netpoll_cleanup(dev);
 231        goto out;
 232}
 233
 234int br_netpoll_enable(struct net_bridge_port *p)
 235{
 236        struct netpoll *np;
 237        int err = 0;
 238
 239        np = kzalloc(sizeof(*p->np), GFP_KERNEL);
 240        err = -ENOMEM;
 241        if (!np)
 242                goto out;
 243
 244        np->dev = p->dev;
 245        strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
 246
 247        err = __netpoll_setup(np);
 248        if (err) {
 249                kfree(np);
 250                goto out;
 251        }
 252
 253        p->np = np;
 254
 255out:
 256        return err;
 257}
 258
 259void br_netpoll_disable(struct net_bridge_port *p)
 260{
 261        struct netpoll *np = p->np;
 262
 263        if (!np)
 264                return;
 265
 266        p->np = NULL;
 267
 268        /* Wait for transmitting packets to finish before freeing. */
 269        synchronize_rcu_bh();
 270
 271        __netpoll_cleanup(np);
 272        kfree(np);
 273}
 274
 275#endif
 276
 277static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
 278
 279{
 280        struct net_bridge *br = netdev_priv(dev);
 281
 282        return br_add_if(br, slave_dev);
 283}
 284
 285static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
 286{
 287        struct net_bridge *br = netdev_priv(dev);
 288
 289        return br_del_if(br, slave_dev);
 290}
 291
 292static const struct ethtool_ops br_ethtool_ops = {
 293        .get_drvinfo    = br_getinfo,
 294        .get_link       = ethtool_op_get_link,
 295};
 296
 297static const struct net_device_ops br_netdev_ops = {
 298        .ndo_open                = br_dev_open,
 299        .ndo_stop                = br_dev_stop,
 300        .ndo_init                = br_dev_init,
 301        .ndo_start_xmit          = br_dev_xmit,
 302        .ndo_get_stats64         = br_get_stats64,
 303        .ndo_set_mac_address     = br_set_mac_address,
 304        .ndo_set_rx_mode         = br_dev_set_multicast_list,
 305        .ndo_change_mtu          = br_change_mtu,
 306        .ndo_do_ioctl            = br_dev_ioctl,
 307#ifdef CONFIG_NET_POLL_CONTROLLER
 308        .ndo_netpoll_setup       = br_netpoll_setup,
 309        .ndo_netpoll_cleanup     = br_netpoll_cleanup,
 310        .ndo_poll_controller     = br_poll_controller,
 311#endif
 312        .ndo_add_slave           = br_add_slave,
 313        .ndo_del_slave           = br_del_slave,
 314        .ndo_fix_features        = br_fix_features,
 315};
 316
 317static void br_dev_free(struct net_device *dev)
 318{
 319        struct net_bridge *br = netdev_priv(dev);
 320
 321        free_percpu(br->stats);
 322        free_netdev(dev);
 323}
 324
 325static struct device_type br_type = {
 326        .name   = "bridge",
 327};
 328
 329void br_dev_setup(struct net_device *dev)
 330{
 331        struct net_bridge *br = netdev_priv(dev);
 332
 333        random_ether_addr(dev->dev_addr);
 334        ether_setup(dev);
 335
 336        dev->netdev_ops = &br_netdev_ops;
 337        dev->destructor = br_dev_free;
 338        SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 339        SET_NETDEV_DEVTYPE(dev, &br_type);
 340        dev->tx_queue_len = 0;
 341        dev->priv_flags = IFF_EBRIDGE;
 342
 343        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 344                        NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 345                        NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
 346        dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 347                           NETIF_F_GSO_MASK | NETIF_F_NO_CSUM |
 348                           NETIF_F_HW_VLAN_TX;
 349
 350        br->dev = dev;
 351        spin_lock_init(&br->lock);
 352        INIT_LIST_HEAD(&br->port_list);
 353        spin_lock_init(&br->hash_lock);
 354
 355        br->bridge_id.prio[0] = 0x80;
 356        br->bridge_id.prio[1] = 0x00;
 357
 358        memcpy(br->group_addr, br_group_address, ETH_ALEN);
 359
 360        br->stp_enabled = BR_NO_STP;
 361        br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
 362
 363        br->designated_root = br->bridge_id;
 364        br->bridge_max_age = br->max_age = 20 * HZ;
 365        br->bridge_hello_time = br->hello_time = 2 * HZ;
 366        br->bridge_forward_delay = br->forward_delay = 15 * HZ;
 367        br->ageing_time = 300 * HZ;
 368
 369        br_netfilter_rtable_init(br);
 370        br_stp_timer_init(br);
 371        br_multicast_init(br);
 372}
 373
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