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