net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <net/sock.h>
  19 #include <net/net_namespace.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/export.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/pm_runtime.h>
  25
  26 #include "net-sysfs.h"
  27
  28 #ifdef CONFIG_SYSFS
  29 static const char fmt_hex[] = "%#x\n";
  30 static const char fmt_long_hex[] = "%#lx\n";
  31 static const char fmt_dec[] = "%d\n";
  32 static const char fmt_udec[] = "%u\n";
  33 static const char fmt_ulong[] = "%lu\n";
  34 static const char fmt_u64[] = "%llu\n";
  35
  36 static inline int dev_isalive(const struct net_device *dev)
  37 {
  38         return dev->reg_state <= NETREG_REGISTERED;
  39 }
  40
  41 /* use same locking rules as GIF* ioctl's */
  42 static ssize_t netdev_show(const struct device *dev,
  43                            struct device_attribute *attr, char *buf,
  44                            ssize_t (*format)(const struct net_device *, char *))
  45 {
  46         struct net_device *net = to_net_dev(dev);
  47         ssize_t ret = -EINVAL;
  48
  49         read_lock(&dev_base_lock);
  50         if (dev_isalive(net))
  51                 ret = (*format)(net, buf);
  52         read_unlock(&dev_base_lock);
  53
  54         return ret;
  55 }
  56
  57 /* generate a show function for simple field */
  58 #define NETDEVICE_SHOW(field, format_string)                            \
  59 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  60 {                                                                       \
  61         return sprintf(buf, format_string, net->field);                 \
  62 }                                                                       \
  63 static ssize_t field##_show(struct device *dev,                         \
  64                             struct device_attribute *attr, char *buf)   \
  65 {                                                                       \
  66         return netdev_show(dev, attr, buf, format_##field);             \
  67 }                                                                       \
  68
  69 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  70 NETDEVICE_SHOW(field, format_string);                                   \
  71 static DEVICE_ATTR_RO(field)
  72
  73 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  74 NETDEVICE_SHOW(field, format_string);                                   \
  75 static DEVICE_ATTR_RW(field)
  76
  77 /* use same locking and permission rules as SIF* ioctl's */
  78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  79                             const char *buf, size_t len,
  80                             int (*set)(struct net_device *, unsigned long))
  81 {
  82         struct net_device *netdev = to_net_dev(dev);
  83         struct net *net = dev_net(netdev);
  84         unsigned long new;
  85         int ret = -EINVAL;
  86
  87         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  88                 return -EPERM;
  89
  90         ret = kstrtoul(buf, 0, &new);
  91         if (ret)
  92                 goto err;
  93
  94         if (!rtnl_trylock())
  95                 return restart_syscall();
  96
  97         if (dev_isalive(netdev)) {
  98                 if ((ret = (*set)(netdev, new)) == 0)
  99                         ret = len;
 100         }
 101         rtnl_unlock();
 102  err:
 103         return ret;
 104 }
 105
 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 109 NETDEVICE_SHOW_RO(iflink, fmt_dec);
 110 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 111 NETDEVICE_SHOW_RO(type, fmt_dec);
 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 113
 114 /* use same locking rules as GIFHWADDR ioctl's */
 115 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 116                             char *buf)
 117 {
 118         struct net_device *net = to_net_dev(dev);
 119         ssize_t ret = -EINVAL;
 120
 121         read_lock(&dev_base_lock);
 122         if (dev_isalive(net))
 123                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 124         read_unlock(&dev_base_lock);
 125         return ret;
 126 }
 127 static DEVICE_ATTR_RO(address);
 128
 129 static ssize_t broadcast_show(struct device *dev,
 130                               struct device_attribute *attr, char *buf)
 131 {
 132         struct net_device *net = to_net_dev(dev);
 133         if (dev_isalive(net))
 134                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 135         return -EINVAL;
 136 }
 137 static DEVICE_ATTR_RO(broadcast);
 138
 139 static int change_carrier(struct net_device *net, unsigned long new_carrier)
 140 {
 141         if (!netif_running(net))
 142                 return -EINVAL;
 143         return dev_change_carrier(net, (bool) new_carrier);
 144 }
 145
 146 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 147                              const char *buf, size_t len)
 148 {
 149         return netdev_store(dev, attr, buf, len, change_carrier);
 150 }
 151
 152 static ssize_t carrier_show(struct device *dev,
 153                             struct device_attribute *attr, char *buf)
 154 {
 155         struct net_device *netdev = to_net_dev(dev);
 156         if (netif_running(netdev)) {
 157                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 158         }
 159         return -EINVAL;
 160 }
 161 static DEVICE_ATTR_RW(carrier);
 162
 163 static ssize_t speed_show(struct device *dev,
 164                           struct device_attribute *attr, char *buf)
 165 {
 166         struct net_device *netdev = to_net_dev(dev);
 167         int ret = -EINVAL;
 168
 169         if (!rtnl_trylock())
 170                 return restart_syscall();
 171
 172         if (netif_running(netdev)) {
 173                 struct ethtool_cmd cmd;
 174                 if (!__ethtool_get_settings(netdev, &cmd))
 175                         ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
 176         }
 177         rtnl_unlock();
 178         return ret;
 179 }
 180 static DEVICE_ATTR_RO(speed);
 181
 182 static ssize_t duplex_show(struct device *dev,
 183                            struct device_attribute *attr, char *buf)
 184 {
 185         struct net_device *netdev = to_net_dev(dev);
 186         int ret = -EINVAL;
 187
 188         if (!rtnl_trylock())
 189                 return restart_syscall();
 190
 191         if (netif_running(netdev)) {
 192                 struct ethtool_cmd cmd;
 193                 if (!__ethtool_get_settings(netdev, &cmd)) {
 194                         const char *duplex;
 195                         switch (cmd.duplex) {
 196                         case DUPLEX_HALF:
 197                                 duplex = "half";
 198                                 break;
 199                         case DUPLEX_FULL:
 200                                 duplex = "full";
 201                                 break;
 202                         default:
 203                                 duplex = "unknown";
 204                                 break;
 205                         }
 206                         ret = sprintf(buf, "%s\n", duplex);
 207                 }
 208         }
 209         rtnl_unlock();
 210         return ret;
 211 }
 212 static DEVICE_ATTR_RO(duplex);
 213
 214 static ssize_t dormant_show(struct device *dev,
 215                             struct device_attribute *attr, char *buf)
 216 {
 217         struct net_device *netdev = to_net_dev(dev);
 218
 219         if (netif_running(netdev))
 220                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 221
 222         return -EINVAL;
 223 }
 224 static DEVICE_ATTR_RO(dormant);
 225
 226 static const char *const operstates[] = {
 227         "unknown",
 228         "notpresent", /* currently unused */
 229         "down",
 230         "lowerlayerdown",
 231         "testing", /* currently unused */
 232         "dormant",
 233         "up"
 234 };
 235
 236 static ssize_t operstate_show(struct device *dev,
 237                               struct device_attribute *attr, char *buf)
 238 {
 239         const struct net_device *netdev = to_net_dev(dev);
 240         unsigned char operstate;
 241
 242         read_lock(&dev_base_lock);
 243         operstate = netdev->operstate;
 244         if (!netif_running(netdev))
 245                 operstate = IF_OPER_DOWN;
 246         read_unlock(&dev_base_lock);
 247
 248         if (operstate >= ARRAY_SIZE(operstates))
 249                 return -EINVAL; /* should not happen */
 250
 251         return sprintf(buf, "%s\n", operstates[operstate]);
 252 }
 253 static DEVICE_ATTR_RO(operstate);
 254
 255 /* read-write attributes */
 256
 257 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 258 {
 259         return dev_set_mtu(net, (int) new_mtu);
 260 }
 261
 262 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 263                          const char *buf, size_t len)
 264 {
 265         return netdev_store(dev, attr, buf, len, change_mtu);
 266 }
 267 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 268
 269 static int change_flags(struct net_device *net, unsigned long new_flags)
 270 {
 271         return dev_change_flags(net, (unsigned int) new_flags);
 272 }
 273
 274 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 275                            const char *buf, size_t len)
 276 {
 277         return netdev_store(dev, attr, buf, len, change_flags);
 278 }
 279 NETDEVICE_SHOW_RW(flags, fmt_hex);
 280
 281 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 282 {
 283         net->tx_queue_len = new_len;
 284         return 0;
 285 }
 286
 287 static ssize_t tx_queue_len_store(struct device *dev,
 288                                   struct device_attribute *attr,
 289                                   const char *buf, size_t len)
 290 {
 291         if (!capable(CAP_NET_ADMIN))
 292                 return -EPERM;
 293
 294         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 295 }
 296 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 297
 298 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 299                              const char *buf, size_t len)
 300 {
 301         struct net_device *netdev = to_net_dev(dev);
 302         struct net *net = dev_net(netdev);
 303         size_t count = len;
 304         ssize_t ret;
 305
 306         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 307                 return -EPERM;
 308
 309         /* ignore trailing newline */
 310         if (len >  0 && buf[len - 1] == '\n')
 311                 --count;
 312
 313         if (!rtnl_trylock())
 314                 return restart_syscall();
 315         ret = dev_set_alias(netdev, buf, count);
 316         rtnl_unlock();
 317
 318         return ret < 0 ? ret : len;
 319 }
 320
 321 static ssize_t ifalias_show(struct device *dev,
 322                             struct device_attribute *attr, char *buf)
 323 {
 324         const struct net_device *netdev = to_net_dev(dev);
 325         ssize_t ret = 0;
 326
 327         if (!rtnl_trylock())
 328                 return restart_syscall();
 329         if (netdev->ifalias)
 330                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 331         rtnl_unlock();
 332         return ret;
 333 }
 334 static DEVICE_ATTR_RW(ifalias);
 335
 336 static int change_group(struct net_device *net, unsigned long new_group)
 337 {
 338         dev_set_group(net, (int) new_group);
 339         return 0;
 340 }
 341
 342 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 343                            const char *buf, size_t len)
 344 {
 345         return netdev_store(dev, attr, buf, len, change_group);
 346 }
 347 NETDEVICE_SHOW(group, fmt_dec);
 348 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 349
 350 static ssize_t phys_port_id_show(struct device *dev,
 351                                  struct device_attribute *attr, char *buf)
 352 {
 353         struct net_device *netdev = to_net_dev(dev);
 354         ssize_t ret = -EINVAL;
 355
 356         if (!rtnl_trylock())
 357                 return restart_syscall();
 358
 359         if (dev_isalive(netdev)) {
 360                 struct netdev_phys_port_id ppid;
 361
 362                 ret = dev_get_phys_port_id(netdev, &ppid);
 363                 if (!ret)
 364                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 365         }
 366         rtnl_unlock();
 367
 368         return ret;
 369 }
 370 static DEVICE_ATTR_RO(phys_port_id);
 371
 372 static struct attribute *net_class_attrs[] = {
 373         &dev_attr_netdev_group.attr,
 374         &dev_attr_type.attr,
 375         &dev_attr_dev_id.attr,
 376         &dev_attr_iflink.attr,
 377         &dev_attr_ifindex.attr,
 378         &dev_attr_addr_assign_type.attr,
 379         &dev_attr_addr_len.attr,
 380         &dev_attr_link_mode.attr,
 381         &dev_attr_address.attr,
 382         &dev_attr_broadcast.attr,
 383         &dev_attr_speed.attr,
 384         &dev_attr_duplex.attr,
 385         &dev_attr_dormant.attr,
 386         &dev_attr_operstate.attr,
 387         &dev_attr_ifalias.attr,
 388         &dev_attr_carrier.attr,
 389         &dev_attr_mtu.attr,
 390         &dev_attr_flags.attr,
 391         &dev_attr_tx_queue_len.attr,
 392         &dev_attr_phys_port_id.attr,
 393         NULL,
 394 };
 395 ATTRIBUTE_GROUPS(net_class);
 396
 397 /* Show a given an attribute in the statistics group */
 398 static ssize_t netstat_show(const struct device *d,
 399                             struct device_attribute *attr, char *buf,
 400                             unsigned long offset)
 401 {
 402         struct net_device *dev = to_net_dev(d);
 403         ssize_t ret = -EINVAL;
 404
 405         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 406                         offset % sizeof(u64) != 0);
 407
 408         read_lock(&dev_base_lock);
 409         if (dev_isalive(dev)) {
 410                 struct rtnl_link_stats64 temp;
 411                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 412
 413                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 414         }
 415         read_unlock(&dev_base_lock);
 416         return ret;
 417 }
 418
 419 /* generate a read-only statistics attribute */
 420 #define NETSTAT_ENTRY(name)                                             \
 421 static ssize_t name##_show(struct device *d,                            \
 422                            struct device_attribute *attr, char *buf)    \
 423 {                                                                       \
 424         return netstat_show(d, attr, buf,                               \
 425                             offsetof(struct rtnl_link_stats64, name));  \
 426 }                                                                       \
 427 static DEVICE_ATTR_RO(name)
 428
 429 NETSTAT_ENTRY(rx_packets);
 430 NETSTAT_ENTRY(tx_packets);
 431 NETSTAT_ENTRY(rx_bytes);
 432 NETSTAT_ENTRY(tx_bytes);
 433 NETSTAT_ENTRY(rx_errors);
 434 NETSTAT_ENTRY(tx_errors);
 435 NETSTAT_ENTRY(rx_dropped);
 436 NETSTAT_ENTRY(tx_dropped);
 437 NETSTAT_ENTRY(multicast);
 438 NETSTAT_ENTRY(collisions);
 439 NETSTAT_ENTRY(rx_length_errors);
 440 NETSTAT_ENTRY(rx_over_errors);
 441 NETSTAT_ENTRY(rx_crc_errors);
 442 NETSTAT_ENTRY(rx_frame_errors);
 443 NETSTAT_ENTRY(rx_fifo_errors);
 444 NETSTAT_ENTRY(rx_missed_errors);
 445 NETSTAT_ENTRY(tx_aborted_errors);
 446 NETSTAT_ENTRY(tx_carrier_errors);
 447 NETSTAT_ENTRY(tx_fifo_errors);
 448 NETSTAT_ENTRY(tx_heartbeat_errors);
 449 NETSTAT_ENTRY(tx_window_errors);
 450 NETSTAT_ENTRY(rx_compressed);
 451 NETSTAT_ENTRY(tx_compressed);
 452
 453 static struct attribute *netstat_attrs[] = {
 454         &dev_attr_rx_packets.attr,
 455         &dev_attr_tx_packets.attr,
 456         &dev_attr_rx_bytes.attr,
 457         &dev_attr_tx_bytes.attr,
 458         &dev_attr_rx_errors.attr,
 459         &dev_attr_tx_errors.attr,
 460         &dev_attr_rx_dropped.attr,
 461         &dev_attr_tx_dropped.attr,
 462         &dev_attr_multicast.attr,
 463         &dev_attr_collisions.attr,
 464         &dev_attr_rx_length_errors.attr,
 465         &dev_attr_rx_over_errors.attr,
 466         &dev_attr_rx_crc_errors.attr,
 467         &dev_attr_rx_frame_errors.attr,
 468         &dev_attr_rx_fifo_errors.attr,
 469         &dev_attr_rx_missed_errors.attr,
 470         &dev_attr_tx_aborted_errors.attr,
 471         &dev_attr_tx_carrier_errors.attr,
 472         &dev_attr_tx_fifo_errors.attr,
 473         &dev_attr_tx_heartbeat_errors.attr,
 474         &dev_attr_tx_window_errors.attr,
 475         &dev_attr_rx_compressed.attr,
 476         &dev_attr_tx_compressed.attr,
 477         NULL
 478 };
 479
 480
 481 static struct attribute_group netstat_group = {
 482         .name  = "statistics",
 483         .attrs  = netstat_attrs,
 484 };
 485
 486 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 487 static struct attribute *wireless_attrs[] = {
 488         NULL
 489 };
 490
 491 static struct attribute_group wireless_group = {
 492         .name = "wireless",
 493         .attrs = wireless_attrs,
 494 };
 495 #endif
 496
 497 #else /* CONFIG_SYSFS */
 498 #define net_class_groups        NULL
 499 #endif /* CONFIG_SYSFS */
 500
 501 #ifdef CONFIG_SYSFS
 502 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 503     struct rx_queue_attribute, attr)
 504
 505 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 506
 507 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 508                                   char *buf)
 509 {
 510         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 511         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 512
 513         if (!attribute->show)
 514                 return -EIO;
 515
 516         return attribute->show(queue, attribute, buf);
 517 }
 518
 519 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 520                                    const char *buf, size_t count)
 521 {
 522         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 523         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 524
 525         if (!attribute->store)
 526                 return -EIO;
 527
 528         return attribute->store(queue, attribute, buf, count);
 529 }
 530
 531 static const struct sysfs_ops rx_queue_sysfs_ops = {
 532         .show = rx_queue_attr_show,
 533         .store = rx_queue_attr_store,
 534 };
 535
 536 #ifdef CONFIG_RPS
 537 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 538                             struct rx_queue_attribute *attribute, char *buf)
 539 {
 540         struct rps_map *map;
 541         cpumask_var_t mask;
 542         size_t len = 0;
 543         int i;
 544
 545         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 546                 return -ENOMEM;
 547
 548         rcu_read_lock();
 549         map = rcu_dereference(queue->rps_map);
 550         if (map)
 551                 for (i = 0; i < map->len; i++)
 552                         cpumask_set_cpu(map->cpus[i], mask);
 553
 554         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 555         if (PAGE_SIZE - len < 3) {
 556                 rcu_read_unlock();
 557                 free_cpumask_var(mask);
 558                 return -EINVAL;
 559         }
 560         rcu_read_unlock();
 561
 562         free_cpumask_var(mask);
 563         len += sprintf(buf + len, "\n");
 564         return len;
 565 }
 566
 567 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 568                       struct rx_queue_attribute *attribute,
 569                       const char *buf, size_t len)
 570 {
 571         struct rps_map *old_map, *map;
 572         cpumask_var_t mask;
 573         int err, cpu, i;
 574         static DEFINE_SPINLOCK(rps_map_lock);
 575
 576         if (!capable(CAP_NET_ADMIN))
 577                 return -EPERM;
 578
 579         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 580                 return -ENOMEM;
 581
 582         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 583         if (err) {
 584                 free_cpumask_var(mask);
 585                 return err;
 586         }
 587
 588         map = kzalloc(max_t(unsigned int,
 589             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 590             GFP_KERNEL);
 591         if (!map) {
 592                 free_cpumask_var(mask);
 593                 return -ENOMEM;
 594         }
 595
 596         i = 0;
 597         for_each_cpu_and(cpu, mask, cpu_online_mask)
 598                 map->cpus[i++] = cpu;
 599
 600         if (i)
 601                 map->len = i;
 602         else {
 603                 kfree(map);
 604                 map = NULL;
 605         }
 606
 607         spin_lock(&rps_map_lock);
 608         old_map = rcu_dereference_protected(queue->rps_map,
 609                                             lockdep_is_held(&rps_map_lock));
 610         rcu_assign_pointer(queue->rps_map, map);
 611         spin_unlock(&rps_map_lock);
 612
 613         if (map)
 614                 static_key_slow_inc(&rps_needed);
 615         if (old_map) {
 616                 kfree_rcu(old_map, rcu);
 617                 static_key_slow_dec(&rps_needed);
 618         }
 619         free_cpumask_var(mask);
 620         return len;
 621 }
 622
 623 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 624                                            struct rx_queue_attribute *attr,
 625                                            char *buf)
 626 {
 627         struct rps_dev_flow_table *flow_table;
 628         unsigned long val = 0;
 629
 630         rcu_read_lock();
 631         flow_table = rcu_dereference(queue->rps_flow_table);
 632         if (flow_table)
 633                 val = (unsigned long)flow_table->mask + 1;
 634         rcu_read_unlock();
 635
 636         return sprintf(buf, "%lu\n", val);
 637 }
 638
 639 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 640 {
 641         struct rps_dev_flow_table *table = container_of(rcu,
 642             struct rps_dev_flow_table, rcu);
 643         vfree(table);
 644 }
 645
 646 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 647                                      struct rx_queue_attribute *attr,
 648                                      const char *buf, size_t len)
 649 {
 650         unsigned long mask, count;
 651         struct rps_dev_flow_table *table, *old_table;
 652         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 653         int rc;
 654
 655         if (!capable(CAP_NET_ADMIN))
 656                 return -EPERM;
 657
 658         rc = kstrtoul(buf, 0, &count);
 659         if (rc < 0)
 660                 return rc;
 661
 662         if (count) {
 663                 mask = count - 1;
 664                 /* mask = roundup_pow_of_two(count) - 1;
 665                  * without overflows...
 666                  */
 667                 while ((mask | (mask >> 1)) != mask)
 668                         mask |= (mask >> 1);
 669                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 670                  * and on 32bit arches, must check
 671                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 672                  */
 673 #if BITS_PER_LONG > 32
 674                 if (mask > (unsigned long)(u32)mask)
 675                         return -EINVAL;
 676 #else
 677                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 678                                 / sizeof(struct rps_dev_flow)) {
 679                         /* Enforce a limit to prevent overflow */
 680                         return -EINVAL;
 681                 }
 682 #endif
 683                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 684                 if (!table)
 685                         return -ENOMEM;
 686
 687                 table->mask = mask;
 688                 for (count = 0; count <= mask; count++)
 689                         table->flows[count].cpu = RPS_NO_CPU;
 690         } else
 691                 table = NULL;
 692
 693         spin_lock(&rps_dev_flow_lock);
 694         old_table = rcu_dereference_protected(queue->rps_flow_table,
 695                                               lockdep_is_held(&rps_dev_flow_lock));
 696         rcu_assign_pointer(queue->rps_flow_table, table);
 697         spin_unlock(&rps_dev_flow_lock);
 698
 699         if (old_table)
 700                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 701
 702         return len;
 703 }
 704
 705 static struct rx_queue_attribute rps_cpus_attribute =
 706         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 707
 708
 709 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 710         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 711             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 712 #endif /* CONFIG_RPS */
 713
 714 static struct attribute *rx_queue_default_attrs[] = {
 715 #ifdef CONFIG_RPS
 716         &rps_cpus_attribute.attr,
 717         &rps_dev_flow_table_cnt_attribute.attr,
 718 #endif
 719         NULL
 720 };
 721
 722 static void rx_queue_release(struct kobject *kobj)
 723 {
 724         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 725 #ifdef CONFIG_RPS
 726         struct rps_map *map;
 727         struct rps_dev_flow_table *flow_table;
 728
 729
 730         map = rcu_dereference_protected(queue->rps_map, 1);
 731         if (map) {
 732                 RCU_INIT_POINTER(queue->rps_map, NULL);
 733                 kfree_rcu(map, rcu);
 734         }
 735
 736         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 737         if (flow_table) {
 738                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 739                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 740         }
 741 #endif
 742
 743         memset(kobj, 0, sizeof(*kobj));
 744         dev_put(queue->dev);
 745 }
 746
 747 static struct kobj_type rx_queue_ktype = {
 748         .sysfs_ops = &rx_queue_sysfs_ops,
 749         .release = rx_queue_release,
 750         .default_attrs = rx_queue_default_attrs,
 751 };
 752
 753 static int rx_queue_add_kobject(struct net_device *net, int index)
 754 {
 755         struct netdev_rx_queue *queue = net->_rx + index;
 756         struct kobject *kobj = &queue->kobj;
 757         int error = 0;
 758
 759         kobj->kset = net->queues_kset;
 760         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 761             "rx-%u", index);
 762         if (error)
 763                 goto exit;
 764
 765         if (net->sysfs_rx_queue_group) {
 766                 error = sysfs_create_group(kobj, net->sysfs_rx_queue_group);
 767                 if (error)
 768                         goto exit;
 769         }
 770
 771         kobject_uevent(kobj, KOBJ_ADD);
 772         dev_hold(queue->dev);
 773
 774         return error;
 775 exit:
 776         kobject_put(kobj);
 777         return error;
 778 }
 779 #endif /* CONFIG_SYFS */
 780
 781 int
 782 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 783 {
 784 #ifdef CONFIG_SYSFS
 785         int i;
 786         int error = 0;
 787
 788 #ifndef CONFIG_RPS
 789         if (!net->sysfs_rx_queue_group)
 790                 return 0;
 791 #endif
 792         for (i = old_num; i < new_num; i++) {
 793                 error = rx_queue_add_kobject(net, i);
 794                 if (error) {
 795                         new_num = old_num;
 796                         break;
 797                 }
 798         }
 799
 800         while (--i >= new_num) {
 801                 if (net->sysfs_rx_queue_group)
 802                         sysfs_remove_group(&net->_rx[i].kobj,
 803                                            net->sysfs_rx_queue_group);
 804                 kobject_put(&net->_rx[i].kobj);
 805         }
 806
 807         return error;
 808 #else
 809         return 0;
 810 #endif
 811 }
 812
 813 #ifdef CONFIG_SYSFS
 814 /*
 815  * netdev_queue sysfs structures and functions.
 816  */
 817 struct netdev_queue_attribute {
 818         struct attribute attr;
 819         ssize_t (*show)(struct netdev_queue *queue,
 820             struct netdev_queue_attribute *attr, char *buf);
 821         ssize_t (*store)(struct netdev_queue *queue,
 822             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 823 };
 824 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 825     struct netdev_queue_attribute, attr)
 826
 827 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 828
 829 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 830                                       struct attribute *attr, char *buf)
 831 {
 832         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 833         struct netdev_queue *queue = to_netdev_queue(kobj);
 834
 835         if (!attribute->show)
 836                 return -EIO;
 837
 838         return attribute->show(queue, attribute, buf);
 839 }
 840
 841 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 842                                        struct attribute *attr,
 843                                        const char *buf, size_t count)
 844 {
 845         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 846         struct netdev_queue *queue = to_netdev_queue(kobj);
 847
 848         if (!attribute->store)
 849                 return -EIO;
 850
 851         return attribute->store(queue, attribute, buf, count);
 852 }
 853
 854 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 855         .show = netdev_queue_attr_show,
 856         .store = netdev_queue_attr_store,
 857 };
 858
 859 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 860                                   struct netdev_queue_attribute *attribute,
 861                                   char *buf)
 862 {
 863         unsigned long trans_timeout;
 864
 865         spin_lock_irq(&queue->_xmit_lock);
 866         trans_timeout = queue->trans_timeout;
 867         spin_unlock_irq(&queue->_xmit_lock);
 868
 869         return sprintf(buf, "%lu", trans_timeout);
 870 }
 871
 872 static struct netdev_queue_attribute queue_trans_timeout =
 873         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
 874
 875 #ifdef CONFIG_BQL
 876 /*
 877  * Byte queue limits sysfs structures and functions.
 878  */
 879 static ssize_t bql_show(char *buf, unsigned int value)
 880 {
 881         return sprintf(buf, "%u\n", value);
 882 }
 883
 884 static ssize_t bql_set(const char *buf, const size_t count,
 885                        unsigned int *pvalue)
 886 {
 887         unsigned int value;
 888         int err;
 889
 890         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
 891                 value = DQL_MAX_LIMIT;
 892         else {
 893                 err = kstrtouint(buf, 10, &value);
 894                 if (err < 0)
 895                         return err;
 896                 if (value > DQL_MAX_LIMIT)
 897                         return -EINVAL;
 898         }
 899
 900         *pvalue = value;
 901
 902         return count;
 903 }
 904
 905 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 906                                   struct netdev_queue_attribute *attr,
 907                                   char *buf)
 908 {
 909         struct dql *dql = &queue->dql;
 910
 911         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
 912 }
 913
 914 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 915                                  struct netdev_queue_attribute *attribute,
 916                                  const char *buf, size_t len)
 917 {
 918         struct dql *dql = &queue->dql;
 919         unsigned int value;
 920         int err;
 921
 922         err = kstrtouint(buf, 10, &value);
 923         if (err < 0)
 924                 return err;
 925
 926         dql->slack_hold_time = msecs_to_jiffies(value);
 927
 928         return len;
 929 }
 930
 931 static struct netdev_queue_attribute bql_hold_time_attribute =
 932         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
 933             bql_set_hold_time);
 934
 935 static ssize_t bql_show_inflight(struct netdev_queue *queue,
 936                                  struct netdev_queue_attribute *attr,
 937                                  char *buf)
 938 {
 939         struct dql *dql = &queue->dql;
 940
 941         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
 942 }
 943
 944 static struct netdev_queue_attribute bql_inflight_attribute =
 945         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
 946
 947 #define BQL_ATTR(NAME, FIELD)                                           \
 948 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
 949                                  struct netdev_queue_attribute *attr,   \
 950                                  char *buf)                             \
 951 {                                                                       \
 952         return bql_show(buf, queue->dql.FIELD);                         \
 953 }                                                                       \
 954                                                                         \
 955 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
 956                                 struct netdev_queue_attribute *attr,    \
 957                                 const char *buf, size_t len)            \
 958 {                                                                       \
 959         return bql_set(buf, len, &queue->dql.FIELD);                    \
 960 }                                                                       \
 961                                                                         \
 962 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
 963         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
 964             bql_set_ ## NAME);
 965
 966 BQL_ATTR(limit, limit)
 967 BQL_ATTR(limit_max, max_limit)
 968 BQL_ATTR(limit_min, min_limit)
 969
 970 static struct attribute *dql_attrs[] = {
 971         &bql_limit_attribute.attr,
 972         &bql_limit_max_attribute.attr,
 973         &bql_limit_min_attribute.attr,
 974         &bql_hold_time_attribute.attr,
 975         &bql_inflight_attribute.attr,
 976         NULL
 977 };
 978
 979 static struct attribute_group dql_group = {
 980         .name  = "byte_queue_limits",
 981         .attrs  = dql_attrs,
 982 };
 983 #endif /* CONFIG_BQL */
 984
 985 #ifdef CONFIG_XPS
 986 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 987 {
 988         struct net_device *dev = queue->dev;
 989         int i;
 990
 991         for (i = 0; i < dev->num_tx_queues; i++)
 992                 if (queue == &dev->_tx[i])
 993                         break;
 994
 995         BUG_ON(i >= dev->num_tx_queues);
 996
 997         return i;
 998 }
 999
1000
1001 static ssize_t show_xps_map(struct netdev_queue *queue,
1002                             struct netdev_queue_attribute *attribute, char *buf)
1003 {
1004         struct net_device *dev = queue->dev;
1005         struct xps_dev_maps *dev_maps;
1006         cpumask_var_t mask;
1007         unsigned long index;
1008         size_t len = 0;
1009         int i;
1010
1011         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1012                 return -ENOMEM;
1013
1014         index = get_netdev_queue_index(queue);
1015
1016         rcu_read_lock();
1017         dev_maps = rcu_dereference(dev->xps_maps);
1018         if (dev_maps) {
1019                 for_each_possible_cpu(i) {
1020                         struct xps_map *map =
1021                             rcu_dereference(dev_maps->cpu_map[i]);
1022                         if (map) {
1023                                 int j;
1024                                 for (j = 0; j < map->len; j++) {
1025                                         if (map->queues[j] == index) {
1026                                                 cpumask_set_cpu(i, mask);
1027                                                 break;
1028                                         }
1029                                 }
1030                         }
1031                 }
1032         }
1033         rcu_read_unlock();
1034
1035         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1036         if (PAGE_SIZE - len < 3) {
1037                 free_cpumask_var(mask);
1038                 return -EINVAL;
1039         }
1040
1041         free_cpumask_var(mask);
1042         len += sprintf(buf + len, "\n");
1043         return len;
1044 }
1045
1046 static ssize_t store_xps_map(struct netdev_queue *queue,
1047                       struct netdev_queue_attribute *attribute,
1048                       const char *buf, size_t len)
1049 {
1050         struct net_device *dev = queue->dev;
1051         unsigned long index;
1052         cpumask_var_t mask;
1053         int err;
1054
1055         if (!capable(CAP_NET_ADMIN))
1056                 return -EPERM;
1057
1058         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1059                 return -ENOMEM;
1060
1061         index = get_netdev_queue_index(queue);
1062
1063         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1064         if (err) {
1065                 free_cpumask_var(mask);
1066                 return err;
1067         }
1068
1069         err = netif_set_xps_queue(dev, mask, index);
1070
1071         free_cpumask_var(mask);
1072
1073         return err ? : len;
1074 }
1075
1076 static struct netdev_queue_attribute xps_cpus_attribute =
1077     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1078 #endif /* CONFIG_XPS */
1079
1080 static struct attribute *netdev_queue_default_attrs[] = {
1081         &queue_trans_timeout.attr,
1082 #ifdef CONFIG_XPS
1083         &xps_cpus_attribute.attr,
1084 #endif
1085         NULL
1086 };
1087
1088 static void netdev_queue_release(struct kobject *kobj)
1089 {
1090         struct netdev_queue *queue = to_netdev_queue(kobj);
1091
1092         memset(kobj, 0, sizeof(*kobj));
1093         dev_put(queue->dev);
1094 }
1095
1096 static struct kobj_type netdev_queue_ktype = {
1097         .sysfs_ops = &netdev_queue_sysfs_ops,
1098         .release = netdev_queue_release,
1099         .default_attrs = netdev_queue_default_attrs,
1100 };
1101
1102 static int netdev_queue_add_kobject(struct net_device *net, int index)
1103 {
1104         struct netdev_queue *queue = net->_tx + index;
1105         struct kobject *kobj = &queue->kobj;
1106         int error = 0;
1107
1108         kobj->kset = net->queues_kset;
1109         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1110             "tx-%u", index);
1111         if (error)
1112                 goto exit;
1113
1114 #ifdef CONFIG_BQL
1115         error = sysfs_create_group(kobj, &dql_group);
1116         if (error)
1117                 goto exit;
1118 #endif
1119
1120         kobject_uevent(kobj, KOBJ_ADD);
1121         dev_hold(queue->dev);
1122
1123         return 0;
1124 exit:
1125         kobject_put(kobj);
1126         return error;
1127 }
1128 #endif /* CONFIG_SYSFS */
1129
1130 int
1131 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1132 {
1133 #ifdef CONFIG_SYSFS
1134         int i;
1135         int error = 0;
1136
1137         for (i = old_num; i < new_num; i++) {
1138                 error = netdev_queue_add_kobject(net, i);
1139                 if (error) {
1140                         new_num = old_num;
1141                         break;
1142                 }
1143         }
1144
1145         while (--i >= new_num) {
1146                 struct netdev_queue *queue = net->_tx + i;
1147
1148 #ifdef CONFIG_BQL
1149                 sysfs_remove_group(&queue->kobj, &dql_group);
1150 #endif
1151                 kobject_put(&queue->kobj);
1152         }
1153
1154         return error;
1155 #else
1156         return 0;
1157 #endif /* CONFIG_SYSFS */
1158 }
1159
1160 static int register_queue_kobjects(struct net_device *net)
1161 {
1162         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1163
1164 #ifdef CONFIG_SYSFS
1165         net->queues_kset = kset_create_and_add("queues",
1166             NULL, &net->dev.kobj);
1167         if (!net->queues_kset)
1168                 return -ENOMEM;
1169         real_rx = net->real_num_rx_queues;
1170 #endif
1171         real_tx = net->real_num_tx_queues;
1172
1173         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1174         if (error)
1175                 goto error;
1176         rxq = real_rx;
1177
1178         error = netdev_queue_update_kobjects(net, 0, real_tx);
1179         if (error)
1180                 goto error;
1181         txq = real_tx;
1182
1183         return 0;
1184
1185 error:
1186         netdev_queue_update_kobjects(net, txq, 0);
1187         net_rx_queue_update_kobjects(net, rxq, 0);
1188         return error;
1189 }
1190
1191 static void remove_queue_kobjects(struct net_device *net)
1192 {
1193         int real_rx = 0, real_tx = 0;
1194
1195 #ifdef CONFIG_SYSFS
1196         real_rx = net->real_num_rx_queues;
1197 #endif
1198         real_tx = net->real_num_tx_queues;
1199
1200         net_rx_queue_update_kobjects(net, real_rx, 0);
1201         netdev_queue_update_kobjects(net, real_tx, 0);
1202 #ifdef CONFIG_SYSFS
1203         kset_unregister(net->queues_kset);
1204 #endif
1205 }
1206
1207 static bool net_current_may_mount(void)
1208 {
1209         struct net *net = current->nsproxy->net_ns;
1210
1211         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1212 }
1213
1214 static void *net_grab_current_ns(void)
1215 {
1216         struct net *ns = current->nsproxy->net_ns;
1217 #ifdef CONFIG_NET_NS
1218         if (ns)
1219                 atomic_inc(&ns->passive);
1220 #endif
1221         return ns;
1222 }
1223
1224 static const void *net_initial_ns(void)
1225 {
1226         return &init_net;
1227 }
1228
1229 static const void *net_netlink_ns(struct sock *sk)
1230 {
1231         return sock_net(sk);
1232 }
1233
1234 struct kobj_ns_type_operations net_ns_type_operations = {
1235         .type = KOBJ_NS_TYPE_NET,
1236         .current_may_mount = net_current_may_mount,
1237         .grab_current_ns = net_grab_current_ns,
1238         .netlink_ns = net_netlink_ns,
1239         .initial_ns = net_initial_ns,
1240         .drop_ns = net_drop_ns,
1241 };
1242 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1243
1244 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1245 {
1246         struct net_device *dev = to_net_dev(d);
1247         int retval;
1248
1249         /* pass interface to uevent. */
1250         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1251         if (retval)
1252                 goto exit;
1253
1254         /* pass ifindex to uevent.
1255          * ifindex is useful as it won't change (interface name may change)
1256          * and is what RtNetlink uses natively. */
1257         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1258
1259 exit:
1260         return retval;
1261 }
1262
1263 /*
1264  *      netdev_release -- destroy and free a dead device.
1265  *      Called when last reference to device kobject is gone.
1266  */
1267 static void netdev_release(struct device *d)
1268 {
1269         struct net_device *dev = to_net_dev(d);
1270
1271         BUG_ON(dev->reg_state != NETREG_RELEASED);
1272
1273         kfree(dev->ifalias);
1274         netdev_freemem(dev);
1275 }
1276
1277 static const void *net_namespace(struct device *d)
1278 {
1279         struct net_device *dev;
1280         dev = container_of(d, struct net_device, dev);
1281         return dev_net(dev);
1282 }
1283
1284 static struct class net_class = {
1285         .name = "net",
1286         .dev_release = netdev_release,
1287         .dev_groups = net_class_groups,
1288         .dev_uevent = netdev_uevent,
1289         .ns_type = &net_ns_type_operations,
1290         .namespace = net_namespace,
1291 };
1292
1293 /* Delete sysfs entries but hold kobject reference until after all
1294  * netdev references are gone.
1295  */
1296 void netdev_unregister_kobject(struct net_device * net)
1297 {
1298         struct device *dev = &(net->dev);
1299
1300         kobject_get(&dev->kobj);
1301
1302         remove_queue_kobjects(net);
1303
1304         pm_runtime_set_memalloc_noio(dev, false);
1305
1306         device_del(dev);
1307 }
1308
1309 /* Create sysfs entries for network device. */
1310 int netdev_register_kobject(struct net_device *net)
1311 {
1312         struct device *dev = &(net->dev);
1313         const struct attribute_group **groups = net->sysfs_groups;
1314         int error = 0;
1315
1316         device_initialize(dev);
1317         dev->class = &net_class;
1318         dev->platform_data = net;
1319         dev->groups = groups;
1320
1321         dev_set_name(dev, "%s", net->name);
1322
1323 #ifdef CONFIG_SYSFS
1324         /* Allow for a device specific group */
1325         if (*groups)
1326                 groups++;
1327
1328         *groups++ = &netstat_group;
1329
1330 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1331         if (net->ieee80211_ptr)
1332                 *groups++ = &wireless_group;
1333 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1334         else if (net->wireless_handlers)
1335                 *groups++ = &wireless_group;
1336 #endif
1337 #endif
1338 #endif /* CONFIG_SYSFS */
1339
1340         error = device_add(dev);
1341         if (error)
1342                 return error;
1343
1344         error = register_queue_kobjects(net);
1345         if (error) {
1346                 device_del(dev);
1347                 return error;
1348         }
1349
1350         pm_runtime_set_memalloc_noio(dev, true);
1351
1352         return error;
1353 }
1354
1355 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1356                                 const void *ns)
1357 {
1358         return class_create_file_ns(&net_class, class_attr, ns);
1359 }
1360 EXPORT_SYMBOL(netdev_class_create_file_ns);
1361
1362 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1363                                  const void *ns)
1364 {
1365         class_remove_file_ns(&net_class, class_attr, ns);
1366 }
1367 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1368
1369 int __init netdev_kobject_init(void)
1370 {
1371         kobj_ns_type_register(&net_ns_type_operations);
1372         return class_register(&net_class);
1373 }