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 <net/wext.h>
  24
  25 #include "net-sysfs.h"
  26
  27 #ifdef CONFIG_SYSFS
  28 static const char fmt_hex[] = "%#x\n";
  29 static const char fmt_long_hex[] = "%#lx\n";
  30 static const char fmt_dec[] = "%d\n";
  31 static const char fmt_ulong[] = "%lu\n";
  32
  33 static inline int dev_isalive(const struct net_device *dev)
  34 {
  35         return dev->reg_state <= NETREG_REGISTERED;
  36 }
  37
  38 /* use same locking rules as GIF* ioctl's */
  39 static ssize_t netdev_show(const struct device *dev,
  40                            struct device_attribute *attr, char *buf,
  41                            ssize_t (*format)(const struct net_device *, char *))
  42 {
  43         struct net_device *net = to_net_dev(dev);
  44         ssize_t ret = -EINVAL;
  45
  46         read_lock(&dev_base_lock);
  47         if (dev_isalive(net))
  48                 ret = (*format)(net, buf);
  49         read_unlock(&dev_base_lock);
  50
  51         return ret;
  52 }
  53
  54 /* generate a show function for simple field */
  55 #define NETDEVICE_SHOW(field, format_string)                            \
  56 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  57 {                                                                       \
  58         return sprintf(buf, format_string, net->field);                 \
  59 }                                                                       \
  60 static ssize_t show_##field(struct device *dev,                         \
  61                             struct device_attribute *attr, char *buf)   \
  62 {                                                                       \
  63         return netdev_show(dev, attr, buf, format_##field);             \
  64 }
  65
  66
  67 /* use same locking and permission rules as SIF* ioctl's */
  68 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  69                             const char *buf, size_t len,
  70                             int (*set)(struct net_device *, unsigned long))
  71 {
  72         struct net_device *net = to_net_dev(dev);
  73         char *endp;
  74         unsigned long new;
  75         int ret = -EINVAL;
  76
  77         if (!capable(CAP_NET_ADMIN))
  78                 return -EPERM;
  79
  80         new = simple_strtoul(buf, &endp, 0);
  81         if (endp == buf)
  82                 goto err;
  83
  84         if (!rtnl_trylock())
  85                 return restart_syscall();
  86
  87         if (dev_isalive(net)) {
  88                 if ((ret = (*set)(net, new)) == 0)
  89                         ret = len;
  90         }
  91         rtnl_unlock();
  92  err:
  93         return ret;
  94 }
  95
  96 NETDEVICE_SHOW(dev_id, fmt_hex);
  97 NETDEVICE_SHOW(addr_len, fmt_dec);
  98 NETDEVICE_SHOW(iflink, fmt_dec);
  99 NETDEVICE_SHOW(ifindex, fmt_dec);
 100 NETDEVICE_SHOW(features, fmt_long_hex);
 101 NETDEVICE_SHOW(type, fmt_dec);
 102 NETDEVICE_SHOW(link_mode, fmt_dec);
 103
 104 /* use same locking rules as GIFHWADDR ioctl's */
 105 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
 106                             char *buf)
 107 {
 108         struct net_device *net = to_net_dev(dev);
 109         ssize_t ret = -EINVAL;
 110
 111         read_lock(&dev_base_lock);
 112         if (dev_isalive(net))
 113                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 114         read_unlock(&dev_base_lock);
 115         return ret;
 116 }
 117
 118 static ssize_t show_broadcast(struct device *dev,
 119                             struct device_attribute *attr, char *buf)
 120 {
 121         struct net_device *net = to_net_dev(dev);
 122         if (dev_isalive(net))
 123                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 124         return -EINVAL;
 125 }
 126
 127 static ssize_t show_carrier(struct device *dev,
 128                             struct device_attribute *attr, char *buf)
 129 {
 130         struct net_device *netdev = to_net_dev(dev);
 131         if (netif_running(netdev)) {
 132                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 133         }
 134         return -EINVAL;
 135 }
 136
 137 static ssize_t show_speed(struct device *dev,
 138                           struct device_attribute *attr, char *buf)
 139 {
 140         struct net_device *netdev = to_net_dev(dev);
 141         int ret = -EINVAL;
 142
 143         if (!rtnl_trylock())
 144                 return restart_syscall();
 145
 146         if (netif_running(netdev) &&
 147             netdev->ethtool_ops &&
 148             netdev->ethtool_ops->get_settings) {
 149                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 150
 151                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 152                         ret = sprintf(buf, fmt_dec, 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             netdev->ethtool_ops &&
 169             netdev->ethtool_ops->get_settings) {
 170                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 171
 172                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 173                         ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
 174         }
 175         rtnl_unlock();
 176         return ret;
 177 }
 178
 179 static ssize_t show_dormant(struct device *dev,
 180                             struct device_attribute *attr, char *buf)
 181 {
 182         struct net_device *netdev = to_net_dev(dev);
 183
 184         if (netif_running(netdev))
 185                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 186
 187         return -EINVAL;
 188 }
 189
 190 static const char *const operstates[] = {
 191         "unknown",
 192         "notpresent", /* currently unused */
 193         "down",
 194         "lowerlayerdown",
 195         "testing", /* currently unused */
 196         "dormant",
 197         "up"
 198 };
 199
 200 static ssize_t show_operstate(struct device *dev,
 201                               struct device_attribute *attr, char *buf)
 202 {
 203         const struct net_device *netdev = to_net_dev(dev);
 204         unsigned char operstate;
 205
 206         read_lock(&dev_base_lock);
 207         operstate = netdev->operstate;
 208         if (!netif_running(netdev))
 209                 operstate = IF_OPER_DOWN;
 210         read_unlock(&dev_base_lock);
 211
 212         if (operstate >= ARRAY_SIZE(operstates))
 213                 return -EINVAL; /* should not happen */
 214
 215         return sprintf(buf, "%s\n", operstates[operstate]);
 216 }
 217
 218 /* read-write attributes */
 219 NETDEVICE_SHOW(mtu, fmt_dec);
 220
 221 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 222 {
 223         return dev_set_mtu(net, (int) new_mtu);
 224 }
 225
 226 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
 227                          const char *buf, size_t len)
 228 {
 229         return netdev_store(dev, attr, buf, len, change_mtu);
 230 }
 231
 232 NETDEVICE_SHOW(flags, fmt_hex);
 233
 234 static int change_flags(struct net_device *net, unsigned long new_flags)
 235 {
 236         return dev_change_flags(net, (unsigned) new_flags);
 237 }
 238
 239 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
 240                            const char *buf, size_t len)
 241 {
 242         return netdev_store(dev, attr, buf, len, change_flags);
 243 }
 244
 245 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 246
 247 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 248 {
 249         net->tx_queue_len = new_len;
 250         return 0;
 251 }
 252
 253 static ssize_t store_tx_queue_len(struct device *dev,
 254                                   struct device_attribute *attr,
 255                                   const char *buf, size_t len)
 256 {
 257         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 258 }
 259
 260 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
 261                              const char *buf, size_t len)
 262 {
 263         struct net_device *netdev = to_net_dev(dev);
 264         size_t count = len;
 265         ssize_t ret;
 266
 267         if (!capable(CAP_NET_ADMIN))
 268                 return -EPERM;
 269
 270         /* ignore trailing newline */
 271         if (len >  0 && buf[len - 1] == '\n')
 272                 --count;
 273
 274         if (!rtnl_trylock())
 275                 return restart_syscall();
 276         ret = dev_set_alias(netdev, buf, count);
 277         rtnl_unlock();
 278
 279         return ret < 0 ? ret : len;
 280 }
 281
 282 static ssize_t show_ifalias(struct device *dev,
 283                             struct device_attribute *attr, char *buf)
 284 {
 285         const struct net_device *netdev = to_net_dev(dev);
 286         ssize_t ret = 0;
 287
 288         if (!rtnl_trylock())
 289                 return restart_syscall();
 290         if (netdev->ifalias)
 291                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 292         rtnl_unlock();
 293         return ret;
 294 }
 295
 296 static struct device_attribute net_class_attributes[] = {
 297         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 298         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
 299         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
 300         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 301         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 302         __ATTR(features, S_IRUGO, show_features, NULL),
 303         __ATTR(type, S_IRUGO, show_type, NULL),
 304         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 305         __ATTR(address, S_IRUGO, show_address, NULL),
 306         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 307         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 308         __ATTR(speed, S_IRUGO, show_speed, NULL),
 309         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 310         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 311         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 312         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 313         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 314         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 315                store_tx_queue_len),
 316         {}
 317 };
 318
 319 /* Show a given an attribute in the statistics group */
 320 static ssize_t netstat_show(const struct device *d,
 321                             struct device_attribute *attr, char *buf,
 322                             unsigned long offset)
 323 {
 324         struct net_device *dev = to_net_dev(d);
 325         ssize_t ret = -EINVAL;
 326
 327         WARN_ON(offset > sizeof(struct net_device_stats) ||
 328                         offset % sizeof(unsigned long) != 0);
 329
 330         read_lock(&dev_base_lock);
 331         if (dev_isalive(dev)) {
 332                 const struct net_device_stats *stats = dev_get_stats(dev);
 333                 ret = sprintf(buf, fmt_ulong,
 334                               *(unsigned long *)(((u8 *) stats) + offset));
 335         }
 336         read_unlock(&dev_base_lock);
 337         return ret;
 338 }
 339
 340 /* generate a read-only statistics attribute */
 341 #define NETSTAT_ENTRY(name)                                             \
 342 static ssize_t show_##name(struct device *d,                            \
 343                            struct device_attribute *attr, char *buf)    \
 344 {                                                                       \
 345         return netstat_show(d, attr, buf,                               \
 346                             offsetof(struct net_device_stats, name));   \
 347 }                                                                       \
 348 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 349
 350 NETSTAT_ENTRY(rx_packets);
 351 NETSTAT_ENTRY(tx_packets);
 352 NETSTAT_ENTRY(rx_bytes);
 353 NETSTAT_ENTRY(tx_bytes);
 354 NETSTAT_ENTRY(rx_errors);
 355 NETSTAT_ENTRY(tx_errors);
 356 NETSTAT_ENTRY(rx_dropped);
 357 NETSTAT_ENTRY(tx_dropped);
 358 NETSTAT_ENTRY(multicast);
 359 NETSTAT_ENTRY(collisions);
 360 NETSTAT_ENTRY(rx_length_errors);
 361 NETSTAT_ENTRY(rx_over_errors);
 362 NETSTAT_ENTRY(rx_crc_errors);
 363 NETSTAT_ENTRY(rx_frame_errors);
 364 NETSTAT_ENTRY(rx_fifo_errors);
 365 NETSTAT_ENTRY(rx_missed_errors);
 366 NETSTAT_ENTRY(tx_aborted_errors);
 367 NETSTAT_ENTRY(tx_carrier_errors);
 368 NETSTAT_ENTRY(tx_fifo_errors);
 369 NETSTAT_ENTRY(tx_heartbeat_errors);
 370 NETSTAT_ENTRY(tx_window_errors);
 371 NETSTAT_ENTRY(rx_compressed);
 372 NETSTAT_ENTRY(tx_compressed);
 373
 374 static struct attribute *netstat_attrs[] = {
 375         &dev_attr_rx_packets.attr,
 376         &dev_attr_tx_packets.attr,
 377         &dev_attr_rx_bytes.attr,
 378         &dev_attr_tx_bytes.attr,
 379         &dev_attr_rx_errors.attr,
 380         &dev_attr_tx_errors.attr,
 381         &dev_attr_rx_dropped.attr,
 382         &dev_attr_tx_dropped.attr,
 383         &dev_attr_multicast.attr,
 384         &dev_attr_collisions.attr,
 385         &dev_attr_rx_length_errors.attr,
 386         &dev_attr_rx_over_errors.attr,
 387         &dev_attr_rx_crc_errors.attr,
 388         &dev_attr_rx_frame_errors.attr,
 389         &dev_attr_rx_fifo_errors.attr,
 390         &dev_attr_rx_missed_errors.attr,
 391         &dev_attr_tx_aborted_errors.attr,
 392         &dev_attr_tx_carrier_errors.attr,
 393         &dev_attr_tx_fifo_errors.attr,
 394         &dev_attr_tx_heartbeat_errors.attr,
 395         &dev_attr_tx_window_errors.attr,
 396         &dev_attr_rx_compressed.attr,
 397         &dev_attr_tx_compressed.attr,
 398         NULL
 399 };
 400
 401
 402 static struct attribute_group netstat_group = {
 403         .name  = "statistics",
 404         .attrs  = netstat_attrs,
 405 };
 406
 407 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 408 /* helper function that does all the locking etc for wireless stats */
 409 static ssize_t wireless_show(struct device *d, char *buf,
 410                              ssize_t (*format)(const struct iw_statistics *,
 411                                                char *))
 412 {
 413         struct net_device *dev = to_net_dev(d);
 414         const struct iw_statistics *iw;
 415         ssize_t ret = -EINVAL;
 416
 417         if (!rtnl_trylock())
 418                 return restart_syscall();
 419         if (dev_isalive(dev)) {
 420                 iw = get_wireless_stats(dev);
 421                 if (iw)
 422                         ret = (*format)(iw, buf);
 423         }
 424         rtnl_unlock();
 425
 426         return ret;
 427 }
 428
 429 /* show function template for wireless fields */
 430 #define WIRELESS_SHOW(name, field, format_string)                       \
 431 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 432 {                                                                       \
 433         return sprintf(buf, format_string, iw->field);                  \
 434 }                                                                       \
 435 static ssize_t show_iw_##name(struct device *d,                         \
 436                               struct device_attribute *attr, char *buf) \
 437 {                                                                       \
 438         return wireless_show(d, buf, format_iw_##name);                 \
 439 }                                                                       \
 440 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 441
 442 WIRELESS_SHOW(status, status, fmt_hex);
 443 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 444 WIRELESS_SHOW(level, qual.level, fmt_dec);
 445 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 446 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 447 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 448 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 449 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 450 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 451 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 452
 453 static struct attribute *wireless_attrs[] = {
 454         &dev_attr_status.attr,
 455         &dev_attr_link.attr,
 456         &dev_attr_level.attr,
 457         &dev_attr_noise.attr,
 458         &dev_attr_nwid.attr,
 459         &dev_attr_crypt.attr,
 460         &dev_attr_fragment.attr,
 461         &dev_attr_retries.attr,
 462         &dev_attr_misc.attr,
 463         &dev_attr_beacon.attr,
 464         NULL
 465 };
 466
 467 static struct attribute_group wireless_group = {
 468         .name = "wireless",
 469         .attrs = wireless_attrs,
 470 };
 471 #endif
 472
 473 #ifdef CONFIG_RPS
 474 /*
 475  * RX queue sysfs structures and functions.
 476  */
 477 struct rx_queue_attribute {
 478         struct attribute attr;
 479         ssize_t (*show)(struct netdev_rx_queue *queue,
 480             struct rx_queue_attribute *attr, char *buf);
 481         ssize_t (*store)(struct netdev_rx_queue *queue,
 482             struct rx_queue_attribute *attr, const char *buf, size_t len);
 483 };
 484 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 485     struct rx_queue_attribute, attr)
 486
 487 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 488
 489 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 490                                   char *buf)
 491 {
 492         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 493         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 494
 495         if (!attribute->show)
 496                 return -EIO;
 497
 498         return attribute->show(queue, attribute, buf);
 499 }
 500
 501 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 502                                    const char *buf, size_t count)
 503 {
 504         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 505         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 506
 507         if (!attribute->store)
 508                 return -EIO;
 509
 510         return attribute->store(queue, attribute, buf, count);
 511 }
 512
 513 static struct sysfs_ops rx_queue_sysfs_ops = {
 514         .show = rx_queue_attr_show,
 515         .store = rx_queue_attr_store,
 516 };
 517
 518 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 519                             struct rx_queue_attribute *attribute, char *buf)
 520 {
 521         struct rps_map *map;
 522         cpumask_var_t mask;
 523         size_t len = 0;
 524         int i;
 525
 526         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 527                 return -ENOMEM;
 528
 529         rcu_read_lock();
 530         map = rcu_dereference(queue->rps_map);
 531         if (map)
 532                 for (i = 0; i < map->len; i++)
 533                         cpumask_set_cpu(map->cpus[i], mask);
 534
 535         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 536         if (PAGE_SIZE - len < 3) {
 537                 rcu_read_unlock();
 538                 free_cpumask_var(mask);
 539                 return -EINVAL;
 540         }
 541         rcu_read_unlock();
 542
 543         free_cpumask_var(mask);
 544         len += sprintf(buf + len, "\n");
 545         return len;
 546 }
 547
 548 static void rps_map_release(struct rcu_head *rcu)
 549 {
 550         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
 551
 552         kfree(map);
 553 }
 554
 555 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 556                       struct rx_queue_attribute *attribute,
 557                       const char *buf, size_t len)
 558 {
 559         struct rps_map *old_map, *map;
 560         cpumask_var_t mask;
 561         int err, cpu, i;
 562         static DEFINE_SPINLOCK(rps_map_lock);
 563
 564         if (!capable(CAP_NET_ADMIN))
 565                 return -EPERM;
 566
 567         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 568                 return -ENOMEM;
 569
 570         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 571         if (err) {
 572                 free_cpumask_var(mask);
 573                 return err;
 574         }
 575
 576         map = kzalloc(max_t(unsigned,
 577             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 578             GFP_KERNEL);
 579         if (!map) {
 580                 free_cpumask_var(mask);
 581                 return -ENOMEM;
 582         }
 583
 584         i = 0;
 585         for_each_cpu_and(cpu, mask, cpu_online_mask)
 586                 map->cpus[i++] = cpu;
 587
 588         if (i)
 589                 map->len = i;
 590         else {
 591                 kfree(map);
 592                 map = NULL;
 593         }
 594
 595         spin_lock(&rps_map_lock);
 596         old_map = queue->rps_map;
 597         rcu_assign_pointer(queue->rps_map, map);
 598         spin_unlock(&rps_map_lock);
 599
 600         if (old_map)
 601                 call_rcu(&old_map->rcu, rps_map_release);
 602
 603         free_cpumask_var(mask);
 604         return len;
 605 }
 606
 607 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 608                                            struct rx_queue_attribute *attr,
 609                                            char *buf)
 610 {
 611         struct rps_dev_flow_table *flow_table;
 612         unsigned int val = 0;
 613
 614         rcu_read_lock();
 615         flow_table = rcu_dereference(queue->rps_flow_table);
 616         if (flow_table)
 617                 val = flow_table->mask + 1;
 618         rcu_read_unlock();
 619
 620         return sprintf(buf, "%u\n", val);
 621 }
 622
 623 static void rps_dev_flow_table_release_work(struct work_struct *work)
 624 {
 625         struct rps_dev_flow_table *table = container_of(work,
 626             struct rps_dev_flow_table, free_work);
 627
 628         vfree(table);
 629 }
 630
 631 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 632 {
 633         struct rps_dev_flow_table *table = container_of(rcu,
 634             struct rps_dev_flow_table, rcu);
 635
 636         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 637         schedule_work(&table->free_work);
 638 }
 639
 640 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 641                                      struct rx_queue_attribute *attr,
 642                                      const char *buf, size_t len)
 643 {
 644         unsigned int count;
 645         char *endp;
 646         struct rps_dev_flow_table *table, *old_table;
 647         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 648
 649         if (!capable(CAP_NET_ADMIN))
 650                 return -EPERM;
 651
 652         count = simple_strtoul(buf, &endp, 0);
 653         if (endp == buf)
 654                 return -EINVAL;
 655
 656         if (count) {
 657                 int i;
 658
 659                 if (count > 1<<30) {
 660                         /* Enforce a limit to prevent overflow */
 661                         return -EINVAL;
 662                 }
 663                 count = roundup_pow_of_two(count);
 664                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 665                 if (!table)
 666                         return -ENOMEM;
 667
 668                 table->mask = count - 1;
 669                 for (i = 0; i < count; i++)
 670                         table->flows[i].cpu = RPS_NO_CPU;
 671         } else
 672                 table = NULL;
 673
 674         spin_lock(&rps_dev_flow_lock);
 675         old_table = queue->rps_flow_table;
 676         rcu_assign_pointer(queue->rps_flow_table, table);
 677         spin_unlock(&rps_dev_flow_lock);
 678
 679         if (old_table)
 680                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 681
 682         return len;
 683 }
 684
 685 static struct rx_queue_attribute rps_cpus_attribute =
 686         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 687
 688
 689 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 690         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 691             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 692
 693 static struct attribute *rx_queue_default_attrs[] = {
 694         &rps_cpus_attribute.attr,
 695         &rps_dev_flow_table_cnt_attribute.attr,
 696         NULL
 697 };
 698
 699 static void rx_queue_release(struct kobject *kobj)
 700 {
 701         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 702         struct netdev_rx_queue *first = queue->first;
 703
 704         if (queue->rps_map)
 705                 call_rcu(&queue->rps_map->rcu, rps_map_release);
 706
 707         if (queue->rps_flow_table)
 708                 call_rcu(&queue->rps_flow_table->rcu,
 709                     rps_dev_flow_table_release);
 710
 711         if (atomic_dec_and_test(&first->count))
 712                 kfree(first);
 713 }
 714
 715 static struct kobj_type rx_queue_ktype = {
 716         .sysfs_ops = &rx_queue_sysfs_ops,
 717         .release = rx_queue_release,
 718         .default_attrs = rx_queue_default_attrs,
 719 };
 720
 721 static int rx_queue_add_kobject(struct net_device *net, int index)
 722 {
 723         struct netdev_rx_queue *queue = net->_rx + index;
 724         struct kobject *kobj = &queue->kobj;
 725         int error = 0;
 726
 727         kobj->kset = net->queues_kset;
 728         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 729             "rx-%u", index);
 730         if (error) {
 731                 kobject_put(kobj);
 732                 return error;
 733         }
 734
 735         kobject_uevent(kobj, KOBJ_ADD);
 736
 737         return error;
 738 }
 739
 740 static int rx_queue_register_kobjects(struct net_device *net)
 741 {
 742         int i;
 743         int error = 0;
 744
 745         net->queues_kset = kset_create_and_add("queues",
 746             NULL, &net->dev.kobj);
 747         if (!net->queues_kset)
 748                 return -ENOMEM;
 749         for (i = 0; i < net->num_rx_queues; i++) {
 750                 error = rx_queue_add_kobject(net, i);
 751                 if (error)
 752                         break;
 753         }
 754
 755         if (error)
 756                 while (--i >= 0)
 757                         kobject_put(&net->_rx[i].kobj);
 758
 759         return error;
 760 }
 761
 762 static void rx_queue_remove_kobjects(struct net_device *net)
 763 {
 764         int i;
 765
 766         for (i = 0; i < net->num_rx_queues; i++)
 767                 kobject_put(&net->_rx[i].kobj);
 768         kset_unregister(net->queues_kset);
 769 }
 770 #endif /* CONFIG_RPS */
 771
 772 static const void *net_current_ns(void)
 773 {
 774         return current->nsproxy->net_ns;
 775 }
 776
 777 static const void *net_initial_ns(void)
 778 {
 779         return &init_net;
 780 }
 781
 782 static const void *net_netlink_ns(struct sock *sk)
 783 {
 784         return sock_net(sk);
 785 }
 786
 787 static struct kobj_ns_type_operations net_ns_type_operations = {
 788         .type = KOBJ_NS_TYPE_NET,
 789         .current_ns = net_current_ns,
 790         .netlink_ns = net_netlink_ns,
 791         .initial_ns = net_initial_ns,
 792 };
 793
 794 static void net_kobj_ns_exit(struct net *net)
 795 {
 796         kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
 797 }
 798
 799 static struct pernet_operations sysfs_net_ops = {
 800         .exit = net_kobj_ns_exit,
 801 };
 802
 803 #endif /* CONFIG_SYSFS */
 804
 805 #ifdef CONFIG_HOTPLUG
 806 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
 807 {
 808         struct net_device *dev = to_net_dev(d);
 809         int retval;
 810
 811         if (!net_eq(dev_net(dev), &init_net))
 812                 return 0;
 813
 814         /* pass interface to uevent. */
 815         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
 816         if (retval)
 817                 goto exit;
 818
 819         /* pass ifindex to uevent.
 820          * ifindex is useful as it won't change (interface name may change)
 821          * and is what RtNetlink uses natively. */
 822         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
 823
 824 exit:
 825         return retval;
 826 }
 827 #endif
 828
 829 /*
 830  *      netdev_release -- destroy and free a dead device.
 831  *      Called when last reference to device kobject is gone.
 832  */
 833 static void netdev_release(struct device *d)
 834 {
 835         struct net_device *dev = to_net_dev(d);
 836
 837         BUG_ON(dev->reg_state != NETREG_RELEASED);
 838
 839         kfree(dev->ifalias);
 840         kfree((char *)dev - dev->padded);
 841 }
 842
 843 static const void *net_namespace(struct device *d)
 844 {
 845         struct net_device *dev;
 846         dev = container_of(d, struct net_device, dev);
 847         return dev_net(dev);
 848 }
 849
 850 static struct class net_class = {
 851         .name = "net",
 852         .dev_release = netdev_release,
 853 #ifdef CONFIG_SYSFS
 854         .dev_attrs = net_class_attributes,
 855 #endif /* CONFIG_SYSFS */
 856 #ifdef CONFIG_HOTPLUG
 857         .dev_uevent = netdev_uevent,
 858 #endif
 859         .ns_type = &net_ns_type_operations,
 860         .namespace = net_namespace,
 861 };
 862
 863 /* Delete sysfs entries but hold kobject reference until after all
 864  * netdev references are gone.
 865  */
 866 void netdev_unregister_kobject(struct net_device * net)
 867 {
 868         struct device *dev = &(net->dev);
 869
 870         kobject_get(&dev->kobj);
 871
 872         if (!net_eq(dev_net(net), &init_net))
 873                 return;
 874
 875 #ifdef CONFIG_RPS
 876         rx_queue_remove_kobjects(net);
 877 #endif
 878
 879         device_del(dev);
 880 }
 881
 882 /* Create sysfs entries for network device. */
 883 int netdev_register_kobject(struct net_device *net)
 884 {
 885         struct device *dev = &(net->dev);
 886         const struct attribute_group **groups = net->sysfs_groups;
 887         int error = 0;
 888
 889         dev->class = &net_class;
 890         dev->platform_data = net;
 891         dev->groups = groups;
 892
 893         dev_set_name(dev, "%s", net->name);
 894
 895 #ifdef CONFIG_SYSFS
 896         /* Allow for a device specific group */
 897         if (*groups)
 898                 groups++;
 899
 900         *groups++ = &netstat_group;
 901 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 902         if (net->ieee80211_ptr)
 903                 *groups++ = &wireless_group;
 904 #ifdef CONFIG_WIRELESS_EXT
 905         else if (net->wireless_handlers)
 906                 *groups++ = &wireless_group;
 907 #endif
 908 #endif
 909 #endif /* CONFIG_SYSFS */
 910
 911         if (!net_eq(dev_net(net), &init_net))
 912                 return 0;
 913
 914         error = device_add(dev);
 915         if (error)
 916                 return error;
 917
 918 #ifdef CONFIG_RPS
 919         error = rx_queue_register_kobjects(net);
 920         if (error) {
 921                 device_del(dev);
 922                 return error;
 923         }
 924 #endif
 925
 926         return error;
 927 }
 928
 929 int netdev_class_create_file(struct class_attribute *class_attr)
 930 {
 931         return class_create_file(&net_class, class_attr);
 932 }
 933
 934 void netdev_class_remove_file(struct class_attribute *class_attr)
 935 {
 936         class_remove_file(&net_class, class_attr);
 937 }
 938
 939 EXPORT_SYMBOL(netdev_class_create_file);
 940 EXPORT_SYMBOL(netdev_class_remove_file);
 941
 942 void netdev_initialize_kobject(struct net_device *net)
 943 {
 944         struct device *device = &(net->dev);
 945         device_initialize(device);
 946 }
 947
 948 int netdev_kobject_init(void)
 949 {
 950         kobj_ns_type_register(&net_ns_type_operations);
 951 #ifdef CONFIG_SYSFS
 952         register_pernet_subsys(&sysfs_net_ops);
 953 #endif
 954         return class_register(&net_class);
 955 }