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 #endif /* CONFIG_SYSFS */
 473
 474 #ifdef CONFIG_RPS
 475 /*
 476  * RX queue sysfs structures and functions.
 477  */
 478 struct rx_queue_attribute {
 479         struct attribute attr;
 480         ssize_t (*show)(struct netdev_rx_queue *queue,
 481             struct rx_queue_attribute *attr, char *buf);
 482         ssize_t (*store)(struct netdev_rx_queue *queue,
 483             struct rx_queue_attribute *attr, const char *buf, size_t len);
 484 };
 485 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 486     struct rx_queue_attribute, attr)
 487
 488 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 489
 490 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 491                                   char *buf)
 492 {
 493         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 494         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 495
 496         if (!attribute->show)
 497                 return -EIO;
 498
 499         return attribute->show(queue, attribute, buf);
 500 }
 501
 502 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 503                                    const char *buf, size_t count)
 504 {
 505         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 506         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 507
 508         if (!attribute->store)
 509                 return -EIO;
 510
 511         return attribute->store(queue, attribute, buf, count);
 512 }
 513
 514 static struct sysfs_ops rx_queue_sysfs_ops = {
 515         .show = rx_queue_attr_show,
 516         .store = rx_queue_attr_store,
 517 };
 518
 519 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 520                             struct rx_queue_attribute *attribute, char *buf)
 521 {
 522         struct rps_map *map;
 523         cpumask_var_t mask;
 524         size_t len = 0;
 525         int i;
 526
 527         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 528                 return -ENOMEM;
 529
 530         rcu_read_lock();
 531         map = rcu_dereference(queue->rps_map);
 532         if (map)
 533                 for (i = 0; i < map->len; i++)
 534                         cpumask_set_cpu(map->cpus[i], mask);
 535
 536         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 537         if (PAGE_SIZE - len < 3) {
 538                 rcu_read_unlock();
 539                 free_cpumask_var(mask);
 540                 return -EINVAL;
 541         }
 542         rcu_read_unlock();
 543
 544         free_cpumask_var(mask);
 545         len += sprintf(buf + len, "\n");
 546         return len;
 547 }
 548
 549 static void rps_map_release(struct rcu_head *rcu)
 550 {
 551         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
 552
 553         kfree(map);
 554 }
 555
 556 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 557                       struct rx_queue_attribute *attribute,
 558                       const char *buf, size_t len)
 559 {
 560         struct rps_map *old_map, *map;
 561         cpumask_var_t mask;
 562         int err, cpu, i;
 563         static DEFINE_SPINLOCK(rps_map_lock);
 564
 565         if (!capable(CAP_NET_ADMIN))
 566                 return -EPERM;
 567
 568         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 569                 return -ENOMEM;
 570
 571         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 572         if (err) {
 573                 free_cpumask_var(mask);
 574                 return err;
 575         }
 576
 577         map = kzalloc(max_t(unsigned,
 578             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 579             GFP_KERNEL);
 580         if (!map) {
 581                 free_cpumask_var(mask);
 582                 return -ENOMEM;
 583         }
 584
 585         i = 0;
 586         for_each_cpu_and(cpu, mask, cpu_online_mask)
 587                 map->cpus[i++] = cpu;
 588
 589         if (i)
 590                 map->len = i;
 591         else {
 592                 kfree(map);
 593                 map = NULL;
 594         }
 595
 596         spin_lock(&rps_map_lock);
 597         old_map = queue->rps_map;
 598         rcu_assign_pointer(queue->rps_map, map);
 599         spin_unlock(&rps_map_lock);
 600
 601         if (old_map)
 602                 call_rcu(&old_map->rcu, rps_map_release);
 603
 604         free_cpumask_var(mask);
 605         return len;
 606 }
 607
 608 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 609                                            struct rx_queue_attribute *attr,
 610                                            char *buf)
 611 {
 612         struct rps_dev_flow_table *flow_table;
 613         unsigned int val = 0;
 614
 615         rcu_read_lock();
 616         flow_table = rcu_dereference(queue->rps_flow_table);
 617         if (flow_table)
 618                 val = flow_table->mask + 1;
 619         rcu_read_unlock();
 620
 621         return sprintf(buf, "%u\n", val);
 622 }
 623
 624 static void rps_dev_flow_table_release_work(struct work_struct *work)
 625 {
 626         struct rps_dev_flow_table *table = container_of(work,
 627             struct rps_dev_flow_table, free_work);
 628
 629         vfree(table);
 630 }
 631
 632 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 633 {
 634         struct rps_dev_flow_table *table = container_of(rcu,
 635             struct rps_dev_flow_table, rcu);
 636
 637         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 638         schedule_work(&table->free_work);
 639 }
 640
 641 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 642                                      struct rx_queue_attribute *attr,
 643                                      const char *buf, size_t len)
 644 {
 645         unsigned int count;
 646         char *endp;
 647         struct rps_dev_flow_table *table, *old_table;
 648         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 649
 650         if (!capable(CAP_NET_ADMIN))
 651                 return -EPERM;
 652
 653         count = simple_strtoul(buf, &endp, 0);
 654         if (endp == buf)
 655                 return -EINVAL;
 656
 657         if (count) {
 658                 int i;
 659
 660                 if (count > 1<<30) {
 661                         /* Enforce a limit to prevent overflow */
 662                         return -EINVAL;
 663                 }
 664                 count = roundup_pow_of_two(count);
 665                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 666                 if (!table)
 667                         return -ENOMEM;
 668
 669                 table->mask = count - 1;
 670                 for (i = 0; i < count; i++)
 671                         table->flows[i].cpu = RPS_NO_CPU;
 672         } else
 673                 table = NULL;
 674
 675         spin_lock(&rps_dev_flow_lock);
 676         old_table = queue->rps_flow_table;
 677         rcu_assign_pointer(queue->rps_flow_table, table);
 678         spin_unlock(&rps_dev_flow_lock);
 679
 680         if (old_table)
 681                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 682
 683         return len;
 684 }
 685
 686 static struct rx_queue_attribute rps_cpus_attribute =
 687         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 688
 689
 690 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 691         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 692             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 693
 694 static struct attribute *rx_queue_default_attrs[] = {
 695         &rps_cpus_attribute.attr,
 696         &rps_dev_flow_table_cnt_attribute.attr,
 697         NULL
 698 };
 699
 700 static void rx_queue_release(struct kobject *kobj)
 701 {
 702         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 703         struct netdev_rx_queue *first = queue->first;
 704
 705         if (queue->rps_map)
 706                 call_rcu(&queue->rps_map->rcu, rps_map_release);
 707
 708         if (queue->rps_flow_table)
 709                 call_rcu(&queue->rps_flow_table->rcu,
 710                     rps_dev_flow_table_release);
 711
 712         if (atomic_dec_and_test(&first->count))
 713                 kfree(first);
 714 }
 715
 716 static struct kobj_type rx_queue_ktype = {
 717         .sysfs_ops = &rx_queue_sysfs_ops,
 718         .release = rx_queue_release,
 719         .default_attrs = rx_queue_default_attrs,
 720 };
 721
 722 static int rx_queue_add_kobject(struct net_device *net, int index)
 723 {
 724         struct netdev_rx_queue *queue = net->_rx + index;
 725         struct kobject *kobj = &queue->kobj;
 726         int error = 0;
 727
 728         kobj->kset = net->queues_kset;
 729         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 730             "rx-%u", index);
 731         if (error) {
 732                 kobject_put(kobj);
 733                 return error;
 734         }
 735
 736         kobject_uevent(kobj, KOBJ_ADD);
 737
 738         return error;
 739 }
 740
 741 static int rx_queue_register_kobjects(struct net_device *net)
 742 {
 743         int i;
 744         int error = 0;
 745
 746         net->queues_kset = kset_create_and_add("queues",
 747             NULL, &net->dev.kobj);
 748         if (!net->queues_kset)
 749                 return -ENOMEM;
 750         for (i = 0; i < net->num_rx_queues; i++) {
 751                 error = rx_queue_add_kobject(net, i);
 752                 if (error)
 753                         break;
 754         }
 755
 756         if (error)
 757                 while (--i >= 0)
 758                         kobject_put(&net->_rx[i].kobj);
 759
 760         return error;
 761 }
 762
 763 static void rx_queue_remove_kobjects(struct net_device *net)
 764 {
 765         int i;
 766
 767         for (i = 0; i < net->num_rx_queues; i++)
 768                 kobject_put(&net->_rx[i].kobj);
 769         kset_unregister(net->queues_kset);
 770 }
 771 #endif /* CONFIG_RPS */
 772
 773 static const void *net_current_ns(void)
 774 {
 775         return current->nsproxy->net_ns;
 776 }
 777
 778 static const void *net_initial_ns(void)
 779 {
 780         return &init_net;
 781 }
 782
 783 static const void *net_netlink_ns(struct sock *sk)
 784 {
 785         return sock_net(sk);
 786 }
 787
 788 static struct kobj_ns_type_operations net_ns_type_operations = {
 789         .type = KOBJ_NS_TYPE_NET,
 790         .current_ns = net_current_ns,
 791         .netlink_ns = net_netlink_ns,
 792         .initial_ns = net_initial_ns,
 793 };
 794
 795 static void net_kobj_ns_exit(struct net *net)
 796 {
 797         kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
 798 }
 799
 800 static struct pernet_operations kobj_net_ops = {
 801         .exit = net_kobj_ns_exit,
 802 };
 803
 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         /* pass interface to uevent. */
 812         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
 813         if (retval)
 814                 goto exit;
 815
 816         /* pass ifindex to uevent.
 817          * ifindex is useful as it won't change (interface name may change)
 818          * and is what RtNetlink uses natively. */
 819         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
 820
 821 exit:
 822         return retval;
 823 }
 824 #endif
 825
 826 /*
 827  *      netdev_release -- destroy and free a dead device.
 828  *      Called when last reference to device kobject is gone.
 829  */
 830 static void netdev_release(struct device *d)
 831 {
 832         struct net_device *dev = to_net_dev(d);
 833
 834         BUG_ON(dev->reg_state != NETREG_RELEASED);
 835
 836         kfree(dev->ifalias);
 837         kfree((char *)dev - dev->padded);
 838 }
 839
 840 static const void *net_namespace(struct device *d)
 841 {
 842         struct net_device *dev;
 843         dev = container_of(d, struct net_device, dev);
 844         return dev_net(dev);
 845 }
 846
 847 static struct class net_class = {
 848         .name = "net",
 849         .dev_release = netdev_release,
 850 #ifdef CONFIG_SYSFS
 851         .dev_attrs = net_class_attributes,
 852 #endif /* CONFIG_SYSFS */
 853 #ifdef CONFIG_HOTPLUG
 854         .dev_uevent = netdev_uevent,
 855 #endif
 856         .ns_type = &net_ns_type_operations,
 857         .namespace = net_namespace,
 858 };
 859
 860 /* Delete sysfs entries but hold kobject reference until after all
 861  * netdev references are gone.
 862  */
 863 void netdev_unregister_kobject(struct net_device * net)
 864 {
 865         struct device *dev = &(net->dev);
 866
 867         kobject_get(&dev->kobj);
 868
 869 #ifdef CONFIG_RPS
 870         rx_queue_remove_kobjects(net);
 871 #endif
 872
 873         device_del(dev);
 874 }
 875
 876 /* Create sysfs entries for network device. */
 877 int netdev_register_kobject(struct net_device *net)
 878 {
 879         struct device *dev = &(net->dev);
 880         const struct attribute_group **groups = net->sysfs_groups;
 881         int error = 0;
 882
 883         device_initialize(dev);
 884         dev->class = &net_class;
 885         dev->platform_data = net;
 886         dev->groups = groups;
 887
 888         dev_set_name(dev, "%s", net->name);
 889
 890 #ifdef CONFIG_SYSFS
 891         /* Allow for a device specific group */
 892         if (*groups)
 893                 groups++;
 894
 895         *groups++ = &netstat_group;
 896 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 897         if (net->ieee80211_ptr)
 898                 *groups++ = &wireless_group;
 899 #ifdef CONFIG_WIRELESS_EXT
 900         else if (net->wireless_handlers)
 901                 *groups++ = &wireless_group;
 902 #endif
 903 #endif
 904 #endif /* CONFIG_SYSFS */
 905
 906         error = device_add(dev);
 907         if (error)
 908                 return error;
 909
 910 #ifdef CONFIG_RPS
 911         error = rx_queue_register_kobjects(net);
 912         if (error) {
 913                 device_del(dev);
 914                 return error;
 915         }
 916 #endif
 917
 918         return error;
 919 }
 920
 921 int netdev_class_create_file(struct class_attribute *class_attr)
 922 {
 923         return class_create_file(&net_class, class_attr);
 924 }
 925
 926 void netdev_class_remove_file(struct class_attribute *class_attr)
 927 {
 928         class_remove_file(&net_class, class_attr);
 929 }
 930
 931 EXPORT_SYMBOL(netdev_class_create_file);
 932 EXPORT_SYMBOL(netdev_class_remove_file);
 933
 934 int netdev_kobject_init(void)
 935 {
 936         kobj_ns_type_register(&net_ns_type_operations);
 937         register_pernet_subsys(&kobj_net_ops);
 938         return class_register(&net_class);
 939 }