Pileus Git - ~andy/linux/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/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 */
  26 netdev_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         if (!br_allowed_ingress(br, br_get_vlan_info(br), skb))
  49                 goto out;
  50
  51         BR_INPUT_SKB_CB(skb)->brdev = dev;
  52
  53         skb_reset_mac_header(skb);
  54         skb_pull(skb, ETH_HLEN);
  55
  56         if (is_broadcast_ether_addr(dest))
  57                 br_flood_deliver(br, skb);
  58         else if (is_multicast_ether_addr(dest)) {
  59                 if (unlikely(netpoll_tx_running(dev))) {
  60                         br_flood_deliver(br, skb);
  61                         goto out;
  62                 }
  63                 if (br_multicast_rcv(br, NULL, skb)) {
  64                         kfree_skb(skb);
  65                         goto out;
  66                 }
  67
  68                 mdst = br_mdb_get(br, skb);
  69                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  70                         br_multicast_deliver(mdst, skb);
  71                 else
  72                         br_flood_deliver(br, skb);
  73         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  74                 br_deliver(dst->dst, skb);
  75         else
  76                 br_flood_deliver(br, skb);
  77
  78 out:
  79         rcu_read_unlock();
  80         return NETDEV_TX_OK;
  81 }
  82
  83 static int br_dev_init(struct net_device *dev)
  84 {
  85         struct net_bridge *br = netdev_priv(dev);
  86
  87         br->stats = alloc_percpu(struct br_cpu_netstats);
  88         if (!br->stats)
  89                 return -ENOMEM;
  90
  91         return 0;
  92 }
  93
  94 static int br_dev_open(struct net_device *dev)
  95 {
  96         struct net_bridge *br = netdev_priv(dev);
  97
  98         netdev_update_features(dev);
  99         netif_start_queue(dev);
 100         br_stp_enable_bridge(br);
 101         br_multicast_open(br);
 102
 103         return 0;
 104 }
 105
 106 static void br_dev_set_multicast_list(struct net_device *dev)
 107 {
 108 }
 109
 110 static int br_dev_stop(struct net_device *dev)
 111 {
 112         struct net_bridge *br = netdev_priv(dev);
 113
 114         br_stp_disable_bridge(br);
 115         br_multicast_stop(br);
 116
 117         netif_stop_queue(dev);
 118
 119         return 0;
 120 }
 121
 122 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
 123                                                 struct rtnl_link_stats64 *stats)
 124 {
 125         struct net_bridge *br = netdev_priv(dev);
 126         struct br_cpu_netstats tmp, sum = { 0 };
 127         unsigned int cpu;
 128
 129         for_each_possible_cpu(cpu) {
 130                 unsigned int start;
 131                 const struct br_cpu_netstats *bstats
 132                         = per_cpu_ptr(br->stats, cpu);
 133                 do {
 134                         start = u64_stats_fetch_begin_bh(&bstats->syncp);
 135                         memcpy(&tmp, bstats, sizeof(tmp));
 136                 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
 137                 sum.tx_bytes   += tmp.tx_bytes;
 138                 sum.tx_packets += tmp.tx_packets;
 139                 sum.rx_bytes   += tmp.rx_bytes;
 140                 sum.rx_packets += tmp.rx_packets;
 141         }
 142
 143         stats->tx_bytes   = sum.tx_bytes;
 144         stats->tx_packets = sum.tx_packets;
 145         stats->rx_bytes   = sum.rx_bytes;
 146         stats->rx_packets = sum.rx_packets;
 147
 148         return stats;
 149 }
 150
 151 static int br_change_mtu(struct net_device *dev, int new_mtu)
 152 {
 153         struct net_bridge *br = netdev_priv(dev);
 154         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 155                 return -EINVAL;
 156
 157         dev->mtu = new_mtu;
 158
 159 #ifdef CONFIG_BRIDGE_NETFILTER
 160         /* remember the MTU in the rtable for PMTU */
 161         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
 162 #endif
 163
 164         return 0;
 165 }
 166
 167 /* Allow setting mac address to any valid ethernet address. */
 168 static int br_set_mac_address(struct net_device *dev, void *p)
 169 {
 170         struct net_bridge *br = netdev_priv(dev);
 171         struct sockaddr *addr = p;
 172
 173         if (!is_valid_ether_addr(addr->sa_data))
 174                 return -EADDRNOTAVAIL;
 175
 176         spin_lock_bh(&br->lock);
 177         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
 178                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 179                 br_fdb_change_mac_address(br, addr->sa_data);
 180                 br_stp_change_bridge_id(br, addr->sa_data);
 181         }
 182         spin_unlock_bh(&br->lock);
 183
 184         return 0;
 185 }
 186
 187 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 188 {
 189         strlcpy(info->driver, "bridge", sizeof(info->driver));
 190         strlcpy(info->version, BR_VERSION, sizeof(info->version));
 191         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 192         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
 193 }
 194
 195 static netdev_features_t br_fix_features(struct net_device *dev,
 196         netdev_features_t features)
 197 {
 198         struct net_bridge *br = netdev_priv(dev);
 199
 200         return br_features_recompute(br, features);
 201 }
 202
 203 #ifdef CONFIG_NET_POLL_CONTROLLER
 204 static void br_poll_controller(struct net_device *br_dev)
 205 {
 206 }
 207
 208 static void br_netpoll_cleanup(struct net_device *dev)
 209 {
 210         struct net_bridge *br = netdev_priv(dev);
 211         struct net_bridge_port *p;
 212
 213         list_for_each_entry(p, &br->port_list, list)
 214                 br_netpoll_disable(p);
 215 }
 216
 217 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
 218                             gfp_t gfp)
 219 {
 220         struct net_bridge *br = netdev_priv(dev);
 221         struct net_bridge_port *p;
 222         int err = 0;
 223
 224         list_for_each_entry(p, &br->port_list, list) {
 225                 if (!p->dev)
 226                         continue;
 227                 err = br_netpoll_enable(p, gfp);
 228                 if (err)
 229                         goto fail;
 230         }
 231
 232 out:
 233         return err;
 234
 235 fail:
 236         br_netpoll_cleanup(dev);
 237         goto out;
 238 }
 239
 240 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 241 {
 242         struct netpoll *np;
 243         int err = 0;
 244
 245         np = kzalloc(sizeof(*p->np), gfp);
 246         err = -ENOMEM;
 247         if (!np)
 248                 goto out;
 249
 250         err = __netpoll_setup(np, p->dev, gfp);
 251         if (err) {
 252                 kfree(np);
 253                 goto out;
 254         }
 255
 256         p->np = np;
 257
 258 out:
 259         return err;
 260 }
 261
 262 void br_netpoll_disable(struct net_bridge_port *p)
 263 {
 264         struct netpoll *np = p->np;
 265
 266         if (!np)
 267                 return;
 268
 269         p->np = NULL;
 270
 271         __netpoll_free_async(np);
 272 }
 273
 274 #endif
 275
 276 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
 277
 278 {
 279         struct net_bridge *br = netdev_priv(dev);
 280
 281         return br_add_if(br, slave_dev);
 282 }
 283
 284 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
 285 {
 286         struct net_bridge *br = netdev_priv(dev);
 287
 288         return br_del_if(br, slave_dev);
 289 }
 290
 291 static const struct ethtool_ops br_ethtool_ops = {
 292         .get_drvinfo    = br_getinfo,
 293         .get_link       = ethtool_op_get_link,
 294 };
 295
 296 static const struct net_device_ops br_netdev_ops = {
 297         .ndo_open                = br_dev_open,
 298         .ndo_stop                = br_dev_stop,
 299         .ndo_init                = br_dev_init,
 300         .ndo_start_xmit          = br_dev_xmit,
 301         .ndo_get_stats64         = br_get_stats64,
 302         .ndo_set_mac_address     = br_set_mac_address,
 303         .ndo_set_rx_mode         = br_dev_set_multicast_list,
 304         .ndo_change_mtu          = br_change_mtu,
 305         .ndo_do_ioctl            = br_dev_ioctl,
 306 #ifdef CONFIG_NET_POLL_CONTROLLER
 307         .ndo_netpoll_setup       = br_netpoll_setup,
 308         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
 309         .ndo_poll_controller     = br_poll_controller,
 310 #endif
 311         .ndo_add_slave           = br_add_slave,
 312         .ndo_del_slave           = br_del_slave,
 313         .ndo_fix_features        = br_fix_features,
 314         .ndo_fdb_add             = br_fdb_add,
 315         .ndo_fdb_del             = br_fdb_delete,
 316         .ndo_fdb_dump            = br_fdb_dump,
 317         .ndo_bridge_getlink      = br_getlink,
 318         .ndo_bridge_setlink      = br_setlink,
 319         .ndo_bridge_dellink      = br_dellink,
 320 };
 321
 322 static void br_dev_free(struct net_device *dev)
 323 {
 324         struct net_bridge *br = netdev_priv(dev);
 325
 326         free_percpu(br->stats);
 327         free_netdev(dev);
 328 }
 329
 330 static struct device_type br_type = {
 331         .name   = "bridge",
 332 };
 333
 334 void br_dev_setup(struct net_device *dev)
 335 {
 336         struct net_bridge *br = netdev_priv(dev);
 337
 338         eth_hw_addr_random(dev);
 339         ether_setup(dev);
 340
 341         dev->netdev_ops = &br_netdev_ops;
 342         dev->destructor = br_dev_free;
 343         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 344         SET_NETDEV_DEVTYPE(dev, &br_type);
 345         dev->tx_queue_len = 0;
 346         dev->priv_flags = IFF_EBRIDGE;
 347
 348         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 349                         NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
 350                         NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
 351         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 352                            NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
 353                            NETIF_F_HW_VLAN_TX;
 354
 355         br->dev = dev;
 356         spin_lock_init(&br->lock);
 357         INIT_LIST_HEAD(&br->port_list);
 358         spin_lock_init(&br->hash_lock);
 359
 360         br->bridge_id.prio[0] = 0x80;
 361         br->bridge_id.prio[1] = 0x00;
 362
 363         memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
 364
 365         br->stp_enabled = BR_NO_STP;
 366         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
 367
 368         br->designated_root = br->bridge_id;
 369         br->bridge_max_age = br->max_age = 20 * HZ;
 370         br->bridge_hello_time = br->hello_time = 2 * HZ;
 371         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
 372         br->ageing_time = 300 * HZ;
 373
 374         br_netfilter_rtable_init(br);
 375         br_stp_timer_init(br);
 376         br_multicast_init(br);
 377 }