net/core/net-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net-sysfs.c - network device class and attributes
   4  *
   5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   6  */
   7
   8 #include <linux/capability.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/sched/isolation.h>
  15 #include <linux/nsproxy.h>
  16 #include <net/sock.h>
  17 #include <net/net_namespace.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/export.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/of.h>
  24 #include <linux/of_net.h>
  25 #include <linux/cpu.h>
  26
  27 #include "dev.h"
  28 #include "net-sysfs.h"
  29
  30 #ifdef CONFIG_SYSFS
  31 static const char fmt_hex[] = "%#x\n";
  32 static const char fmt_dec[] = "%d\n";
  33 static const char fmt_ulong[] = "%lu\n";
  34 static const char fmt_u64[] = "%llu\n";
  35
  36 /* Caller holds RTNL or dev_base_lock */
  37 static inline int dev_isalive(const struct net_device *dev)
  38 {
  39         return dev->reg_state <= NETREG_REGISTERED;
  40 }
  41
  42 /* use same locking rules as GIF* ioctl's */
  43 static ssize_t netdev_show(const struct device *dev,
  44                            struct device_attribute *attr, char *buf,
  45                            ssize_t (*format)(const struct net_device *, char *))
  46 {
  47         struct net_device *ndev = to_net_dev(dev);
  48         ssize_t ret = -EINVAL;
  49
  50         read_lock(&dev_base_lock);
  51         if (dev_isalive(ndev))
  52                 ret = (*format)(ndev, buf);
  53         read_unlock(&dev_base_lock);
  54
  55         return ret;
  56 }
  57
  58 /* generate a show function for simple field */
  59 #define NETDEVICE_SHOW(field, format_string)                            \
  60 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  61 {                                                                       \
  62         return sprintf(buf, format_string, dev->field);                 \
  63 }                                                                       \
  64 static ssize_t field##_show(struct device *dev,                         \
  65                             struct device_attribute *attr, char *buf)   \
  66 {                                                                       \
  67         return netdev_show(dev, attr, buf, format_##field);             \
  68 }                                                                       \
  69
  70 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  71 NETDEVICE_SHOW(field, format_string);                                   \
  72 static DEVICE_ATTR_RO(field)
  73
  74 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  75 NETDEVICE_SHOW(field, format_string);                                   \
  76 static DEVICE_ATTR_RW(field)
  77
  78 /* use same locking and permission rules as SIF* ioctl's */
  79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  80                             const char *buf, size_t len,
  81                             int (*set)(struct net_device *, unsigned long))
  82 {
  83         struct net_device *netdev = to_net_dev(dev);
  84         struct net *net = dev_net(netdev);
  85         unsigned long new;
  86         int ret;
  87
  88         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  89                 return -EPERM;
  90
  91         ret = kstrtoul(buf, 0, &new);
  92         if (ret)
  93                 goto err;
  94
  95         if (!rtnl_trylock())
  96                 return restart_syscall();
  97
  98         if (dev_isalive(netdev)) {
  99                 ret = (*set)(netdev, new);
 100                 if (ret == 0)
 101                         ret = len;
 102         }
 103         rtnl_unlock();
 104  err:
 105         return ret;
 106 }
 107
 108 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 109 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 110 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 111 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 112 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 113 NETDEVICE_SHOW_RO(type, fmt_dec);
 114 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 115
 116 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 117                            char *buf)
 118 {
 119         struct net_device *ndev = to_net_dev(dev);
 120
 121         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 122 }
 123 static DEVICE_ATTR_RO(iflink);
 124
 125 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 126 {
 127         return sprintf(buf, fmt_dec, dev->name_assign_type);
 128 }
 129
 130 static ssize_t name_assign_type_show(struct device *dev,
 131                                      struct device_attribute *attr,
 132                                      char *buf)
 133 {
 134         struct net_device *ndev = to_net_dev(dev);
 135         ssize_t ret = -EINVAL;
 136
 137         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 138                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 139
 140         return ret;
 141 }
 142 static DEVICE_ATTR_RO(name_assign_type);
 143
 144 /* use same locking rules as GIFHWADDR ioctl's */
 145 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 146                             char *buf)
 147 {
 148         struct net_device *ndev = to_net_dev(dev);
 149         ssize_t ret = -EINVAL;
 150
 151         read_lock(&dev_base_lock);
 152         if (dev_isalive(ndev))
 153                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 154         read_unlock(&dev_base_lock);
 155         return ret;
 156 }
 157 static DEVICE_ATTR_RO(address);
 158
 159 static ssize_t broadcast_show(struct device *dev,
 160                               struct device_attribute *attr, char *buf)
 161 {
 162         struct net_device *ndev = to_net_dev(dev);
 163
 164         if (dev_isalive(ndev))
 165                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 166         return -EINVAL;
 167 }
 168 static DEVICE_ATTR_RO(broadcast);
 169
 170 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 171 {
 172         if (!netif_running(dev))
 173                 return -EINVAL;
 174         return dev_change_carrier(dev, (bool)new_carrier);
 175 }
 176
 177 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 178                              const char *buf, size_t len)
 179 {
 180         struct net_device *netdev = to_net_dev(dev);
 181
 182         /* The check is also done in change_carrier; this helps returning early
 183          * without hitting the trylock/restart in netdev_store.
 184          */
 185         if (!netdev->netdev_ops->ndo_change_carrier)
 186                 return -EOPNOTSUPP;
 187
 188         return netdev_store(dev, attr, buf, len, change_carrier);
 189 }
 190
 191 static ssize_t carrier_show(struct device *dev,
 192                             struct device_attribute *attr, char *buf)
 193 {
 194         struct net_device *netdev = to_net_dev(dev);
 195
 196         if (netif_running(netdev))
 197                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 198
 199         return -EINVAL;
 200 }
 201 static DEVICE_ATTR_RW(carrier);
 202
 203 static ssize_t speed_show(struct device *dev,
 204                           struct device_attribute *attr, char *buf)
 205 {
 206         struct net_device *netdev = to_net_dev(dev);
 207         int ret = -EINVAL;
 208
 209         /* The check is also done in __ethtool_get_link_ksettings; this helps
 210          * returning early without hitting the trylock/restart below.
 211          */
 212         if (!netdev->ethtool_ops->get_link_ksettings)
 213                 return ret;
 214
 215         if (!rtnl_trylock())
 216                 return restart_syscall();
 217
 218         if (netif_running(netdev) && netif_device_present(netdev)) {
 219                 struct ethtool_link_ksettings cmd;
 220
 221                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 222                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 223         }
 224         rtnl_unlock();
 225         return ret;
 226 }
 227 static DEVICE_ATTR_RO(speed);
 228
 229 static ssize_t duplex_show(struct device *dev,
 230                            struct device_attribute *attr, char *buf)
 231 {
 232         struct net_device *netdev = to_net_dev(dev);
 233         int ret = -EINVAL;
 234
 235         /* The check is also done in __ethtool_get_link_ksettings; this helps
 236          * returning early without hitting the trylock/restart below.
 237          */
 238         if (!netdev->ethtool_ops->get_link_ksettings)
 239                 return ret;
 240
 241         if (!rtnl_trylock())
 242                 return restart_syscall();
 243
 244         if (netif_running(netdev)) {
 245                 struct ethtool_link_ksettings cmd;
 246
 247                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 248                         const char *duplex;
 249
 250                         switch (cmd.base.duplex) {
 251                         case DUPLEX_HALF:
 252                                 duplex = "half";
 253                                 break;
 254                         case DUPLEX_FULL:
 255                                 duplex = "full";
 256                                 break;
 257                         default:
 258                                 duplex = "unknown";
 259                                 break;
 260                         }
 261                         ret = sprintf(buf, "%s\n", duplex);
 262                 }
 263         }
 264         rtnl_unlock();
 265         return ret;
 266 }
 267 static DEVICE_ATTR_RO(duplex);
 268
 269 static ssize_t testing_show(struct device *dev,
 270                             struct device_attribute *attr, char *buf)
 271 {
 272         struct net_device *netdev = to_net_dev(dev);
 273
 274         if (netif_running(netdev))
 275                 return sprintf(buf, fmt_dec, !!netif_testing(netdev));
 276
 277         return -EINVAL;
 278 }
 279 static DEVICE_ATTR_RO(testing);
 280
 281 static ssize_t dormant_show(struct device *dev,
 282                             struct device_attribute *attr, char *buf)
 283 {
 284         struct net_device *netdev = to_net_dev(dev);
 285
 286         if (netif_running(netdev))
 287                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 288
 289         return -EINVAL;
 290 }
 291 static DEVICE_ATTR_RO(dormant);
 292
 293 static const char *const operstates[] = {
 294         "unknown",
 295         "notpresent", /* currently unused */
 296         "down",
 297         "lowerlayerdown",
 298         "testing",
 299         "dormant",
 300         "up"
 301 };
 302
 303 static ssize_t operstate_show(struct device *dev,
 304                               struct device_attribute *attr, char *buf)
 305 {
 306         const struct net_device *netdev = to_net_dev(dev);
 307         unsigned char operstate;
 308
 309         read_lock(&dev_base_lock);
 310         operstate = netdev->operstate;
 311         if (!netif_running(netdev))
 312                 operstate = IF_OPER_DOWN;
 313         read_unlock(&dev_base_lock);
 314
 315         if (operstate >= ARRAY_SIZE(operstates))
 316                 return -EINVAL; /* should not happen */
 317
 318         return sprintf(buf, "%s\n", operstates[operstate]);
 319 }
 320 static DEVICE_ATTR_RO(operstate);
 321
 322 static ssize_t carrier_changes_show(struct device *dev,
 323                                     struct device_attribute *attr,
 324                                     char *buf)
 325 {
 326         struct net_device *netdev = to_net_dev(dev);
 327
 328         return sprintf(buf, fmt_dec,
 329                        atomic_read(&netdev->carrier_up_count) +
 330                        atomic_read(&netdev->carrier_down_count));
 331 }
 332 static DEVICE_ATTR_RO(carrier_changes);
 333
 334 static ssize_t carrier_up_count_show(struct device *dev,
 335                                      struct device_attribute *attr,
 336                                      char *buf)
 337 {
 338         struct net_device *netdev = to_net_dev(dev);
 339
 340         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 341 }
 342 static DEVICE_ATTR_RO(carrier_up_count);
 343
 344 static ssize_t carrier_down_count_show(struct device *dev,
 345                                        struct device_attribute *attr,
 346                                        char *buf)
 347 {
 348         struct net_device *netdev = to_net_dev(dev);
 349
 350         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 351 }
 352 static DEVICE_ATTR_RO(carrier_down_count);
 353
 354 /* read-write attributes */
 355
 356 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 357 {
 358         return dev_set_mtu(dev, (int)new_mtu);
 359 }
 360
 361 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 362                          const char *buf, size_t len)
 363 {
 364         return netdev_store(dev, attr, buf, len, change_mtu);
 365 }
 366 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 367
 368 static int change_flags(struct net_device *dev, unsigned long new_flags)
 369 {
 370         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 371 }
 372
 373 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 374                            const char *buf, size_t len)
 375 {
 376         return netdev_store(dev, attr, buf, len, change_flags);
 377 }
 378 NETDEVICE_SHOW_RW(flags, fmt_hex);
 379
 380 static ssize_t tx_queue_len_store(struct device *dev,
 381                                   struct device_attribute *attr,
 382                                   const char *buf, size_t len)
 383 {
 384         if (!capable(CAP_NET_ADMIN))
 385                 return -EPERM;
 386
 387         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 388 }
 389 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 390
 391 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 392 {
 393         WRITE_ONCE(dev->gro_flush_timeout, val);
 394         return 0;
 395 }
 396
 397 static ssize_t gro_flush_timeout_store(struct device *dev,
 398                                        struct device_attribute *attr,
 399                                        const char *buf, size_t len)
 400 {
 401         if (!capable(CAP_NET_ADMIN))
 402                 return -EPERM;
 403
 404         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 405 }
 406 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 407
 408 static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
 409 {
 410         WRITE_ONCE(dev->napi_defer_hard_irqs, val);
 411         return 0;
 412 }
 413
 414 static ssize_t napi_defer_hard_irqs_store(struct device *dev,
 415                                           struct device_attribute *attr,
 416                                           const char *buf, size_t len)
 417 {
 418         if (!capable(CAP_NET_ADMIN))
 419                 return -EPERM;
 420
 421         return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
 422 }
 423 NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
 424
 425 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 426                              const char *buf, size_t len)
 427 {
 428         struct net_device *netdev = to_net_dev(dev);
 429         struct net *net = dev_net(netdev);
 430         size_t count = len;
 431         ssize_t ret = 0;
 432
 433         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 434                 return -EPERM;
 435
 436         /* ignore trailing newline */
 437         if (len >  0 && buf[len - 1] == '\n')
 438                 --count;
 439
 440         if (!rtnl_trylock())
 441                 return restart_syscall();
 442
 443         if (dev_isalive(netdev)) {
 444                 ret = dev_set_alias(netdev, buf, count);
 445                 if (ret < 0)
 446                         goto err;
 447                 ret = len;
 448                 netdev_state_change(netdev);
 449         }
 450 err:
 451         rtnl_unlock();
 452
 453         return ret;
 454 }
 455
 456 static ssize_t ifalias_show(struct device *dev,
 457                             struct device_attribute *attr, char *buf)
 458 {
 459         const struct net_device *netdev = to_net_dev(dev);
 460         char tmp[IFALIASZ];
 461         ssize_t ret = 0;
 462
 463         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 464         if (ret > 0)
 465                 ret = sprintf(buf, "%s\n", tmp);
 466         return ret;
 467 }
 468 static DEVICE_ATTR_RW(ifalias);
 469
 470 static int change_group(struct net_device *dev, unsigned long new_group)
 471 {
 472         dev_set_group(dev, (int)new_group);
 473         return 0;
 474 }
 475
 476 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 477                            const char *buf, size_t len)
 478 {
 479         return netdev_store(dev, attr, buf, len, change_group);
 480 }
 481 NETDEVICE_SHOW(group, fmt_dec);
 482 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 483
 484 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 485 {
 486         return dev_change_proto_down(dev, (bool)proto_down);
 487 }
 488
 489 static ssize_t proto_down_store(struct device *dev,
 490                                 struct device_attribute *attr,
 491                                 const char *buf, size_t len)
 492 {
 493         return netdev_store(dev, attr, buf, len, change_proto_down);
 494 }
 495 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 496
 497 static ssize_t phys_port_id_show(struct device *dev,
 498                                  struct device_attribute *attr, char *buf)
 499 {
 500         struct net_device *netdev = to_net_dev(dev);
 501         ssize_t ret = -EINVAL;
 502
 503         /* The check is also done in dev_get_phys_port_id; this helps returning
 504          * early without hitting the trylock/restart below.
 505          */
 506         if (!netdev->netdev_ops->ndo_get_phys_port_id)
 507                 return -EOPNOTSUPP;
 508
 509         if (!rtnl_trylock())
 510                 return restart_syscall();
 511
 512         if (dev_isalive(netdev)) {
 513                 struct netdev_phys_item_id ppid;
 514
 515                 ret = dev_get_phys_port_id(netdev, &ppid);
 516                 if (!ret)
 517                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 518         }
 519         rtnl_unlock();
 520
 521         return ret;
 522 }
 523 static DEVICE_ATTR_RO(phys_port_id);
 524
 525 static ssize_t phys_port_name_show(struct device *dev,
 526                                    struct device_attribute *attr, char *buf)
 527 {
 528         struct net_device *netdev = to_net_dev(dev);
 529         ssize_t ret = -EINVAL;
 530
 531         /* The checks are also done in dev_get_phys_port_name; this helps
 532          * returning early without hitting the trylock/restart below.
 533          */
 534         if (!netdev->netdev_ops->ndo_get_phys_port_name &&
 535             !netdev->netdev_ops->ndo_get_devlink_port)
 536                 return -EOPNOTSUPP;
 537
 538         if (!rtnl_trylock())
 539                 return restart_syscall();
 540
 541         if (dev_isalive(netdev)) {
 542                 char name[IFNAMSIZ];
 543
 544                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 545                 if (!ret)
 546                         ret = sprintf(buf, "%s\n", name);
 547         }
 548         rtnl_unlock();
 549
 550         return ret;
 551 }
 552 static DEVICE_ATTR_RO(phys_port_name);
 553
 554 static ssize_t phys_switch_id_show(struct device *dev,
 555                                    struct device_attribute *attr, char *buf)
 556 {
 557         struct net_device *netdev = to_net_dev(dev);
 558         ssize_t ret = -EINVAL;
 559
 560         /* The checks are also done in dev_get_phys_port_name; this helps
 561          * returning early without hitting the trylock/restart below. This works
 562          * because recurse is false when calling dev_get_port_parent_id.
 563          */
 564         if (!netdev->netdev_ops->ndo_get_port_parent_id &&
 565             !netdev->netdev_ops->ndo_get_devlink_port)
 566                 return -EOPNOTSUPP;
 567
 568         if (!rtnl_trylock())
 569                 return restart_syscall();
 570
 571         if (dev_isalive(netdev)) {
 572                 struct netdev_phys_item_id ppid = { };
 573
 574                 ret = dev_get_port_parent_id(netdev, &ppid, false);
 575                 if (!ret)
 576                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 577         }
 578         rtnl_unlock();
 579
 580         return ret;
 581 }
 582 static DEVICE_ATTR_RO(phys_switch_id);
 583
 584 static ssize_t threaded_show(struct device *dev,
 585                              struct device_attribute *attr, char *buf)
 586 {
 587         struct net_device *netdev = to_net_dev(dev);
 588         ssize_t ret = -EINVAL;
 589
 590         if (!rtnl_trylock())
 591                 return restart_syscall();
 592
 593         if (dev_isalive(netdev))
 594                 ret = sprintf(buf, fmt_dec, netdev->threaded);
 595
 596         rtnl_unlock();
 597         return ret;
 598 }
 599
 600 static int modify_napi_threaded(struct net_device *dev, unsigned long val)
 601 {
 602         int ret;
 603
 604         if (list_empty(&dev->napi_list))
 605                 return -EOPNOTSUPP;
 606
 607         if (val != 0 && val != 1)
 608                 return -EOPNOTSUPP;
 609
 610         ret = dev_set_threaded(dev, val);
 611
 612         return ret;
 613 }
 614
 615 static ssize_t threaded_store(struct device *dev,
 616                               struct device_attribute *attr,
 617                               const char *buf, size_t len)
 618 {
 619         return netdev_store(dev, attr, buf, len, modify_napi_threaded);
 620 }
 621 static DEVICE_ATTR_RW(threaded);
 622
 623 static struct attribute *net_class_attrs[] __ro_after_init = {
 624         &dev_attr_netdev_group.attr,
 625         &dev_attr_type.attr,
 626         &dev_attr_dev_id.attr,
 627         &dev_attr_dev_port.attr,
 628         &dev_attr_iflink.attr,
 629         &dev_attr_ifindex.attr,
 630         &dev_attr_name_assign_type.attr,
 631         &dev_attr_addr_assign_type.attr,
 632         &dev_attr_addr_len.attr,
 633         &dev_attr_link_mode.attr,
 634         &dev_attr_address.attr,
 635         &dev_attr_broadcast.attr,
 636         &dev_attr_speed.attr,
 637         &dev_attr_duplex.attr,
 638         &dev_attr_dormant.attr,
 639         &dev_attr_testing.attr,
 640         &dev_attr_operstate.attr,
 641         &dev_attr_carrier_changes.attr,
 642         &dev_attr_ifalias.attr,
 643         &dev_attr_carrier.attr,
 644         &dev_attr_mtu.attr,
 645         &dev_attr_flags.attr,
 646         &dev_attr_tx_queue_len.attr,
 647         &dev_attr_gro_flush_timeout.attr,
 648         &dev_attr_napi_defer_hard_irqs.attr,
 649         &dev_attr_phys_port_id.attr,
 650         &dev_attr_phys_port_name.attr,
 651         &dev_attr_phys_switch_id.attr,
 652         &dev_attr_proto_down.attr,
 653         &dev_attr_carrier_up_count.attr,
 654         &dev_attr_carrier_down_count.attr,
 655         &dev_attr_threaded.attr,
 656         NULL,
 657 };
 658 ATTRIBUTE_GROUPS(net_class);
 659
 660 /* Show a given an attribute in the statistics group */
 661 static ssize_t netstat_show(const struct device *d,
 662                             struct device_attribute *attr, char *buf,
 663                             unsigned long offset)
 664 {
 665         struct net_device *dev = to_net_dev(d);
 666         ssize_t ret = -EINVAL;
 667
 668         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 669                 offset % sizeof(u64) != 0);
 670
 671         read_lock(&dev_base_lock);
 672         if (dev_isalive(dev)) {
 673                 struct rtnl_link_stats64 temp;
 674                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 675
 676                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 677         }
 678         read_unlock(&dev_base_lock);
 679         return ret;
 680 }
 681
 682 /* generate a read-only statistics attribute */
 683 #define NETSTAT_ENTRY(name)                                             \
 684 static ssize_t name##_show(struct device *d,                            \
 685                            struct device_attribute *attr, char *buf)    \
 686 {                                                                       \
 687         return netstat_show(d, attr, buf,                               \
 688                             offsetof(struct rtnl_link_stats64, name));  \
 689 }                                                                       \
 690 static DEVICE_ATTR_RO(name)
 691
 692 NETSTAT_ENTRY(rx_packets);
 693 NETSTAT_ENTRY(tx_packets);
 694 NETSTAT_ENTRY(rx_bytes);
 695 NETSTAT_ENTRY(tx_bytes);
 696 NETSTAT_ENTRY(rx_errors);
 697 NETSTAT_ENTRY(tx_errors);
 698 NETSTAT_ENTRY(rx_dropped);
 699 NETSTAT_ENTRY(tx_dropped);
 700 NETSTAT_ENTRY(multicast);
 701 NETSTAT_ENTRY(collisions);
 702 NETSTAT_ENTRY(rx_length_errors);
 703 NETSTAT_ENTRY(rx_over_errors);
 704 NETSTAT_ENTRY(rx_crc_errors);
 705 NETSTAT_ENTRY(rx_frame_errors);
 706 NETSTAT_ENTRY(rx_fifo_errors);
 707 NETSTAT_ENTRY(rx_missed_errors);
 708 NETSTAT_ENTRY(tx_aborted_errors);
 709 NETSTAT_ENTRY(tx_carrier_errors);
 710 NETSTAT_ENTRY(tx_fifo_errors);
 711 NETSTAT_ENTRY(tx_heartbeat_errors);
 712 NETSTAT_ENTRY(tx_window_errors);
 713 NETSTAT_ENTRY(rx_compressed);
 714 NETSTAT_ENTRY(tx_compressed);
 715 NETSTAT_ENTRY(rx_nohandler);
 716
 717 static struct attribute *netstat_attrs[] __ro_after_init = {
 718         &dev_attr_rx_packets.attr,
 719         &dev_attr_tx_packets.attr,
 720         &dev_attr_rx_bytes.attr,
 721         &dev_attr_tx_bytes.attr,
 722         &dev_attr_rx_errors.attr,
 723         &dev_attr_tx_errors.attr,
 724         &dev_attr_rx_dropped.attr,
 725         &dev_attr_tx_dropped.attr,
 726         &dev_attr_multicast.attr,
 727         &dev_attr_collisions.attr,
 728         &dev_attr_rx_length_errors.attr,
 729         &dev_attr_rx_over_errors.attr,
 730         &dev_attr_rx_crc_errors.attr,
 731         &dev_attr_rx_frame_errors.attr,
 732         &dev_attr_rx_fifo_errors.attr,
 733         &dev_attr_rx_missed_errors.attr,
 734         &dev_attr_tx_aborted_errors.attr,
 735         &dev_attr_tx_carrier_errors.attr,
 736         &dev_attr_tx_fifo_errors.attr,
 737         &dev_attr_tx_heartbeat_errors.attr,
 738         &dev_attr_tx_window_errors.attr,
 739         &dev_attr_rx_compressed.attr,
 740         &dev_attr_tx_compressed.attr,
 741         &dev_attr_rx_nohandler.attr,
 742         NULL
 743 };
 744
 745 static const struct attribute_group netstat_group = {
 746         .name  = "statistics",
 747         .attrs  = netstat_attrs,
 748 };
 749
 750 static struct attribute *wireless_attrs[] = {
 751         NULL
 752 };
 753
 754 static const struct attribute_group wireless_group = {
 755         .name = "wireless",
 756         .attrs = wireless_attrs,
 757 };
 758
 759 static bool wireless_group_needed(struct net_device *ndev)
 760 {
 761 #if IS_ENABLED(CONFIG_CFG80211)
 762         if (ndev->ieee80211_ptr)
 763                 return true;
 764 #endif
 765 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
 766         if (ndev->wireless_handlers)
 767                 return true;
 768 #endif
 769         return false;
 770 }
 771
 772 #else /* CONFIG_SYSFS */
 773 #define net_class_groups        NULL
 774 #endif /* CONFIG_SYSFS */
 775
 776 #ifdef CONFIG_SYSFS
 777 #define to_rx_queue_attr(_attr) \
 778         container_of(_attr, struct rx_queue_attribute, attr)
 779
 780 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 781
 782 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 783                                   char *buf)
 784 {
 785         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 786         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 787
 788         if (!attribute->show)
 789                 return -EIO;
 790
 791         return attribute->show(queue, buf);
 792 }
 793
 794 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 795                                    const char *buf, size_t count)
 796 {
 797         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 798         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 799
 800         if (!attribute->store)
 801                 return -EIO;
 802
 803         return attribute->store(queue, buf, count);
 804 }
 805
 806 static const struct sysfs_ops rx_queue_sysfs_ops = {
 807         .show = rx_queue_attr_show,
 808         .store = rx_queue_attr_store,
 809 };
 810
 811 #ifdef CONFIG_RPS
 812 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 813 {
 814         struct rps_map *map;
 815         cpumask_var_t mask;
 816         int i, len;
 817
 818         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 819                 return -ENOMEM;
 820
 821         rcu_read_lock();
 822         map = rcu_dereference(queue->rps_map);
 823         if (map)
 824                 for (i = 0; i < map->len; i++)
 825                         cpumask_set_cpu(map->cpus[i], mask);
 826
 827         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 828         rcu_read_unlock();
 829         free_cpumask_var(mask);
 830
 831         return len < PAGE_SIZE ? len : -EINVAL;
 832 }
 833
 834 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 835                              const char *buf, size_t len)
 836 {
 837         struct rps_map *old_map, *map;
 838         cpumask_var_t mask;
 839         int err, cpu, i;
 840         static DEFINE_MUTEX(rps_map_mutex);
 841
 842         if (!capable(CAP_NET_ADMIN))
 843                 return -EPERM;
 844
 845         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 846                 return -ENOMEM;
 847
 848         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 849         if (err) {
 850                 free_cpumask_var(mask);
 851                 return err;
 852         }
 853
 854         if (!cpumask_empty(mask)) {
 855                 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
 856                 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
 857                 if (cpumask_empty(mask)) {
 858                         free_cpumask_var(mask);
 859                         return -EINVAL;
 860                 }
 861         }
 862
 863         map = kzalloc(max_t(unsigned int,
 864                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 865                       GFP_KERNEL);
 866         if (!map) {
 867                 free_cpumask_var(mask);
 868                 return -ENOMEM;
 869         }
 870
 871         i = 0;
 872         for_each_cpu_and(cpu, mask, cpu_online_mask)
 873                 map->cpus[i++] = cpu;
 874
 875         if (i) {
 876                 map->len = i;
 877         } else {
 878                 kfree(map);
 879                 map = NULL;
 880         }
 881
 882         mutex_lock(&rps_map_mutex);
 883         old_map = rcu_dereference_protected(queue->rps_map,
 884                                             mutex_is_locked(&rps_map_mutex));
 885         rcu_assign_pointer(queue->rps_map, map);
 886
 887         if (map)
 888                 static_branch_inc(&rps_needed);
 889         if (old_map)
 890                 static_branch_dec(&rps_needed);
 891
 892         mutex_unlock(&rps_map_mutex);
 893
 894         if (old_map)
 895                 kfree_rcu(old_map, rcu);
 896
 897         free_cpumask_var(mask);
 898         return len;
 899 }
 900
 901 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 902                                            char *buf)
 903 {
 904         struct rps_dev_flow_table *flow_table;
 905         unsigned long val = 0;
 906
 907         rcu_read_lock();
 908         flow_table = rcu_dereference(queue->rps_flow_table);
 909         if (flow_table)
 910                 val = (unsigned long)flow_table->mask + 1;
 911         rcu_read_unlock();
 912
 913         return sprintf(buf, "%lu\n", val);
 914 }
 915
 916 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 917 {
 918         struct rps_dev_flow_table *table = container_of(rcu,
 919             struct rps_dev_flow_table, rcu);
 920         vfree(table);
 921 }
 922
 923 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 924                                             const char *buf, size_t len)
 925 {
 926         unsigned long mask, count;
 927         struct rps_dev_flow_table *table, *old_table;
 928         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 929         int rc;
 930
 931         if (!capable(CAP_NET_ADMIN))
 932                 return -EPERM;
 933
 934         rc = kstrtoul(buf, 0, &count);
 935         if (rc < 0)
 936                 return rc;
 937
 938         if (count) {
 939                 mask = count - 1;
 940                 /* mask = roundup_pow_of_two(count) - 1;
 941                  * without overflows...
 942                  */
 943                 while ((mask | (mask >> 1)) != mask)
 944                         mask |= (mask >> 1);
 945                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 946                  * and on 32bit arches, must check
 947                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 948                  */
 949 #if BITS_PER_LONG > 32
 950                 if (mask > (unsigned long)(u32)mask)
 951                         return -EINVAL;
 952 #else
 953                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 954                                 / sizeof(struct rps_dev_flow)) {
 955                         /* Enforce a limit to prevent overflow */
 956                         return -EINVAL;
 957                 }
 958 #endif
 959                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 960                 if (!table)
 961                         return -ENOMEM;
 962
 963                 table->mask = mask;
 964                 for (count = 0; count <= mask; count++)
 965                         table->flows[count].cpu = RPS_NO_CPU;
 966         } else {
 967                 table = NULL;
 968         }
 969
 970         spin_lock(&rps_dev_flow_lock);
 971         old_table = rcu_dereference_protected(queue->rps_flow_table,
 972                                               lockdep_is_held(&rps_dev_flow_lock));
 973         rcu_assign_pointer(queue->rps_flow_table, table);
 974         spin_unlock(&rps_dev_flow_lock);
 975
 976         if (old_table)
 977                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 978
 979         return len;
 980 }
 981
 982 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 983         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 984
 985 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 986         = __ATTR(rps_flow_cnt, 0644,
 987                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 988 #endif /* CONFIG_RPS */
 989
 990 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 991 #ifdef CONFIG_RPS
 992         &rps_cpus_attribute.attr,
 993         &rps_dev_flow_table_cnt_attribute.attr,
 994 #endif
 995         NULL
 996 };
 997 ATTRIBUTE_GROUPS(rx_queue_default);
 998
 999 static void rx_queue_release(struct kobject *kobj)
1000 {
1001         struct netdev_rx_queue *queue = to_rx_queue(kobj);
1002 #ifdef CONFIG_RPS
1003         struct rps_map *map;
1004         struct rps_dev_flow_table *flow_table;
1005
1006         map = rcu_dereference_protected(queue->rps_map, 1);
1007         if (map) {
1008                 RCU_INIT_POINTER(queue->rps_map, NULL);
1009                 kfree_rcu(map, rcu);
1010         }
1011
1012         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1013         if (flow_table) {
1014                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1015                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1016         }
1017 #endif
1018
1019         memset(kobj, 0, sizeof(*kobj));
1020         dev_put_track(queue->dev, &queue->dev_tracker);
1021 }
1022
1023 static const void *rx_queue_namespace(struct kobject *kobj)
1024 {
1025         struct netdev_rx_queue *queue = to_rx_queue(kobj);
1026         struct device *dev = &queue->dev->dev;
1027         const void *ns = NULL;
1028
1029         if (dev->class && dev->class->ns_type)
1030                 ns = dev->class->namespace(dev);
1031
1032         return ns;
1033 }
1034
1035 static void rx_queue_get_ownership(struct kobject *kobj,
1036                                    kuid_t *uid, kgid_t *gid)
1037 {
1038         const struct net *net = rx_queue_namespace(kobj);
1039
1040         net_ns_get_ownership(net, uid, gid);
1041 }
1042
1043 static struct kobj_type rx_queue_ktype __ro_after_init = {
1044         .sysfs_ops = &rx_queue_sysfs_ops,
1045         .release = rx_queue_release,
1046         .default_groups = rx_queue_default_groups,
1047         .namespace = rx_queue_namespace,
1048         .get_ownership = rx_queue_get_ownership,
1049 };
1050
1051 static int rx_queue_add_kobject(struct net_device *dev, int index)
1052 {
1053         struct netdev_rx_queue *queue = dev->_rx + index;
1054         struct kobject *kobj = &queue->kobj;
1055         int error = 0;
1056
1057         /* Kobject_put later will trigger rx_queue_release call which
1058          * decreases dev refcount: Take that reference here
1059          */
1060         dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1061
1062         kobj->kset = dev->queues_kset;
1063         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1064                                      "rx-%u", index);
1065         if (error)
1066                 goto err;
1067
1068         if (dev->sysfs_rx_queue_group) {
1069                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1070                 if (error)
1071                         goto err;
1072         }
1073
1074         kobject_uevent(kobj, KOBJ_ADD);
1075
1076         return error;
1077
1078 err:
1079         kobject_put(kobj);
1080         return error;
1081 }
1082
1083 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1084                                  kgid_t kgid)
1085 {
1086         struct netdev_rx_queue *queue = dev->_rx + index;
1087         struct kobject *kobj = &queue->kobj;
1088         int error;
1089
1090         error = sysfs_change_owner(kobj, kuid, kgid);
1091         if (error)
1092                 return error;
1093
1094         if (dev->sysfs_rx_queue_group)
1095                 error = sysfs_group_change_owner(
1096                         kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1097
1098         return error;
1099 }
1100 #endif /* CONFIG_SYSFS */
1101
1102 int
1103 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1104 {
1105 #ifdef CONFIG_SYSFS
1106         int i;
1107         int error = 0;
1108
1109 #ifndef CONFIG_RPS
1110         if (!dev->sysfs_rx_queue_group)
1111                 return 0;
1112 #endif
1113         for (i = old_num; i < new_num; i++) {
1114                 error = rx_queue_add_kobject(dev, i);
1115                 if (error) {
1116                         new_num = old_num;
1117                         break;
1118                 }
1119         }
1120
1121         while (--i >= new_num) {
1122                 struct kobject *kobj = &dev->_rx[i].kobj;
1123
1124                 if (!refcount_read(&dev_net(dev)->ns.count))
1125                         kobj->uevent_suppress = 1;
1126                 if (dev->sysfs_rx_queue_group)
1127                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1128                 kobject_put(kobj);
1129         }
1130
1131         return error;
1132 #else
1133         return 0;
1134 #endif
1135 }
1136
1137 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1138                                      kuid_t kuid, kgid_t kgid)
1139 {
1140 #ifdef CONFIG_SYSFS
1141         int error = 0;
1142         int i;
1143
1144 #ifndef CONFIG_RPS
1145         if (!dev->sysfs_rx_queue_group)
1146                 return 0;
1147 #endif
1148         for (i = 0; i < num; i++) {
1149                 error = rx_queue_change_owner(dev, i, kuid, kgid);
1150                 if (error)
1151                         break;
1152         }
1153
1154         return error;
1155 #else
1156         return 0;
1157 #endif
1158 }
1159
1160 #ifdef CONFIG_SYSFS
1161 /*
1162  * netdev_queue sysfs structures and functions.
1163  */
1164 struct netdev_queue_attribute {
1165         struct attribute attr;
1166         ssize_t (*show)(struct netdev_queue *queue, char *buf);
1167         ssize_t (*store)(struct netdev_queue *queue,
1168                          const char *buf, size_t len);
1169 };
1170 #define to_netdev_queue_attr(_attr) \
1171         container_of(_attr, struct netdev_queue_attribute, attr)
1172
1173 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1174
1175 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1176                                       struct attribute *attr, char *buf)
1177 {
1178         const struct netdev_queue_attribute *attribute
1179                 = to_netdev_queue_attr(attr);
1180         struct netdev_queue *queue = to_netdev_queue(kobj);
1181
1182         if (!attribute->show)
1183                 return -EIO;
1184
1185         return attribute->show(queue, buf);
1186 }
1187
1188 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1189                                        struct attribute *attr,
1190                                        const char *buf, size_t count)
1191 {
1192         const struct netdev_queue_attribute *attribute
1193                 = to_netdev_queue_attr(attr);
1194         struct netdev_queue *queue = to_netdev_queue(kobj);
1195
1196         if (!attribute->store)
1197                 return -EIO;
1198
1199         return attribute->store(queue, buf, count);
1200 }
1201
1202 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1203         .show = netdev_queue_attr_show,
1204         .store = netdev_queue_attr_store,
1205 };
1206
1207 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1208 {
1209         unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1210
1211         return sprintf(buf, fmt_ulong, trans_timeout);
1212 }
1213
1214 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1215 {
1216         struct net_device *dev = queue->dev;
1217         unsigned int i;
1218
1219         i = queue - dev->_tx;
1220         BUG_ON(i >= dev->num_tx_queues);
1221
1222         return i;
1223 }
1224
1225 static ssize_t traffic_class_show(struct netdev_queue *queue,
1226                                   char *buf)
1227 {
1228         struct net_device *dev = queue->dev;
1229         int num_tc, tc;
1230         int index;
1231
1232         if (!netif_is_multiqueue(dev))
1233                 return -ENOENT;
1234
1235         if (!rtnl_trylock())
1236                 return restart_syscall();
1237
1238         index = get_netdev_queue_index(queue);
1239
1240         /* If queue belongs to subordinate dev use its TC mapping */
1241         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1242
1243         num_tc = dev->num_tc;
1244         tc = netdev_txq_to_tc(dev, index);
1245
1246         rtnl_unlock();
1247
1248         if (tc < 0)
1249                 return -EINVAL;
1250
1251         /* We can report the traffic class one of two ways:
1252          * Subordinate device traffic classes are reported with the traffic
1253          * class first, and then the subordinate class so for example TC0 on
1254          * subordinate device 2 will be reported as "0-2". If the queue
1255          * belongs to the root device it will be reported with just the
1256          * traffic class, so just "0" for TC 0 for example.
1257          */
1258         return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
1259                             sprintf(buf, "%d\n", tc);
1260 }
1261
1262 #ifdef CONFIG_XPS
1263 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1264                                char *buf)
1265 {
1266         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1267 }
1268
1269 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1270                                 const char *buf, size_t len)
1271 {
1272         struct net_device *dev = queue->dev;
1273         int err, index = get_netdev_queue_index(queue);
1274         u32 rate = 0;
1275
1276         if (!capable(CAP_NET_ADMIN))
1277                 return -EPERM;
1278
1279         /* The check is also done later; this helps returning early without
1280          * hitting the trylock/restart below.
1281          */
1282         if (!dev->netdev_ops->ndo_set_tx_maxrate)
1283                 return -EOPNOTSUPP;
1284
1285         err = kstrtou32(buf, 10, &rate);
1286         if (err < 0)
1287                 return err;
1288
1289         if (!rtnl_trylock())
1290                 return restart_syscall();
1291
1292         err = -EOPNOTSUPP;
1293         if (dev->netdev_ops->ndo_set_tx_maxrate)
1294                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1295
1296         rtnl_unlock();
1297         if (!err) {
1298                 queue->tx_maxrate = rate;
1299                 return len;
1300         }
1301         return err;
1302 }
1303
1304 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1305         = __ATTR_RW(tx_maxrate);
1306 #endif
1307
1308 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1309         = __ATTR_RO(tx_timeout);
1310
1311 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1312         = __ATTR_RO(traffic_class);
1313
1314 #ifdef CONFIG_BQL
1315 /*
1316  * Byte queue limits sysfs structures and functions.
1317  */
1318 static ssize_t bql_show(char *buf, unsigned int value)
1319 {
1320         return sprintf(buf, "%u\n", value);
1321 }
1322
1323 static ssize_t bql_set(const char *buf, const size_t count,
1324                        unsigned int *pvalue)
1325 {
1326         unsigned int value;
1327         int err;
1328
1329         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1330                 value = DQL_MAX_LIMIT;
1331         } else {
1332                 err = kstrtouint(buf, 10, &value);
1333                 if (err < 0)
1334                         return err;
1335                 if (value > DQL_MAX_LIMIT)
1336                         return -EINVAL;
1337         }
1338
1339         *pvalue = value;
1340
1341         return count;
1342 }
1343
1344 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1345                                   char *buf)
1346 {
1347         struct dql *dql = &queue->dql;
1348
1349         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1350 }
1351
1352 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1353                                  const char *buf, size_t len)
1354 {
1355         struct dql *dql = &queue->dql;
1356         unsigned int value;
1357         int err;
1358
1359         err = kstrtouint(buf, 10, &value);
1360         if (err < 0)
1361                 return err;
1362
1363         dql->slack_hold_time = msecs_to_jiffies(value);
1364
1365         return len;
1366 }
1367
1368 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1369         = __ATTR(hold_time, 0644,
1370                  bql_show_hold_time, bql_set_hold_time);
1371
1372 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1373                                  char *buf)
1374 {
1375         struct dql *dql = &queue->dql;
1376
1377         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1378 }
1379
1380 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1381         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1382
1383 #define BQL_ATTR(NAME, FIELD)                                           \
1384 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1385                                  char *buf)                             \
1386 {                                                                       \
1387         return bql_show(buf, queue->dql.FIELD);                         \
1388 }                                                                       \
1389                                                                         \
1390 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1391                                 const char *buf, size_t len)            \
1392 {                                                                       \
1393         return bql_set(buf, len, &queue->dql.FIELD);                    \
1394 }                                                                       \
1395                                                                         \
1396 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1397         = __ATTR(NAME, 0644,                            \
1398                  bql_show_ ## NAME, bql_set_ ## NAME)
1399
1400 BQL_ATTR(limit, limit);
1401 BQL_ATTR(limit_max, max_limit);
1402 BQL_ATTR(limit_min, min_limit);
1403
1404 static struct attribute *dql_attrs[] __ro_after_init = {
1405         &bql_limit_attribute.attr,
1406         &bql_limit_max_attribute.attr,
1407         &bql_limit_min_attribute.attr,
1408         &bql_hold_time_attribute.attr,
1409         &bql_inflight_attribute.attr,
1410         NULL
1411 };
1412
1413 static const struct attribute_group dql_group = {
1414         .name  = "byte_queue_limits",
1415         .attrs  = dql_attrs,
1416 };
1417 #endif /* CONFIG_BQL */
1418
1419 #ifdef CONFIG_XPS
1420 static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1421                               int tc, char *buf, enum xps_map_type type)
1422 {
1423         struct xps_dev_maps *dev_maps;
1424         unsigned long *mask;
1425         unsigned int nr_ids;
1426         int j, len;
1427
1428         rcu_read_lock();
1429         dev_maps = rcu_dereference(dev->xps_maps[type]);
1430
1431         /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1432          * when dev_maps hasn't been allocated yet, to be backward compatible.
1433          */
1434         nr_ids = dev_maps ? dev_maps->nr_ids :
1435                  (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1436
1437         mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1438         if (!mask) {
1439                 rcu_read_unlock();
1440                 return -ENOMEM;
1441         }
1442
1443         if (!dev_maps || tc >= dev_maps->num_tc)
1444                 goto out_no_maps;
1445
1446         for (j = 0; j < nr_ids; j++) {
1447                 int i, tci = j * dev_maps->num_tc + tc;
1448                 struct xps_map *map;
1449
1450                 map = rcu_dereference(dev_maps->attr_map[tci]);
1451                 if (!map)
1452                         continue;
1453
1454                 for (i = map->len; i--;) {
1455                         if (map->queues[i] == index) {
1456                                 __set_bit(j, mask);
1457                                 break;
1458                         }
1459                 }
1460         }
1461 out_no_maps:
1462         rcu_read_unlock();
1463
1464         len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1465         bitmap_free(mask);
1466
1467         return len < PAGE_SIZE ? len : -EINVAL;
1468 }
1469
1470 static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1471 {
1472         struct net_device *dev = queue->dev;
1473         unsigned int index;
1474         int len, tc;
1475
1476         if (!netif_is_multiqueue(dev))
1477                 return -ENOENT;
1478
1479         index = get_netdev_queue_index(queue);
1480
1481         if (!rtnl_trylock())
1482                 return restart_syscall();
1483
1484         /* If queue belongs to subordinate dev use its map */
1485         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1486
1487         tc = netdev_txq_to_tc(dev, index);
1488         if (tc < 0) {
1489                 rtnl_unlock();
1490                 return -EINVAL;
1491         }
1492
1493         /* Make sure the subordinate device can't be freed */
1494         get_device(&dev->dev);
1495         rtnl_unlock();
1496
1497         len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1498
1499         put_device(&dev->dev);
1500         return len;
1501 }
1502
1503 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1504                               const char *buf, size_t len)
1505 {
1506         struct net_device *dev = queue->dev;
1507         unsigned int index;
1508         cpumask_var_t mask;
1509         int err;
1510
1511         if (!netif_is_multiqueue(dev))
1512                 return -ENOENT;
1513
1514         if (!capable(CAP_NET_ADMIN))
1515                 return -EPERM;
1516
1517         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1518                 return -ENOMEM;
1519
1520         index = get_netdev_queue_index(queue);
1521
1522         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1523         if (err) {
1524                 free_cpumask_var(mask);
1525                 return err;
1526         }
1527
1528         if (!rtnl_trylock()) {
1529                 free_cpumask_var(mask);
1530                 return restart_syscall();
1531         }
1532
1533         err = netif_set_xps_queue(dev, mask, index);
1534         rtnl_unlock();
1535
1536         free_cpumask_var(mask);
1537
1538         return err ? : len;
1539 }
1540
1541 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1542         = __ATTR_RW(xps_cpus);
1543
1544 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1545 {
1546         struct net_device *dev = queue->dev;
1547         unsigned int index;
1548         int tc;
1549
1550         index = get_netdev_queue_index(queue);
1551
1552         if (!rtnl_trylock())
1553                 return restart_syscall();
1554
1555         tc = netdev_txq_to_tc(dev, index);
1556         rtnl_unlock();
1557         if (tc < 0)
1558                 return -EINVAL;
1559
1560         return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1561 }
1562
1563 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1564                               size_t len)
1565 {
1566         struct net_device *dev = queue->dev;
1567         struct net *net = dev_net(dev);
1568         unsigned long *mask;
1569         unsigned int index;
1570         int err;
1571
1572         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1573                 return -EPERM;
1574
1575         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1576         if (!mask)
1577                 return -ENOMEM;
1578
1579         index = get_netdev_queue_index(queue);
1580
1581         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1582         if (err) {
1583                 bitmap_free(mask);
1584                 return err;
1585         }
1586
1587         if (!rtnl_trylock()) {
1588                 bitmap_free(mask);
1589                 return restart_syscall();
1590         }
1591
1592         cpus_read_lock();
1593         err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1594         cpus_read_unlock();
1595
1596         rtnl_unlock();
1597
1598         bitmap_free(mask);
1599         return err ? : len;
1600 }
1601
1602 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1603         = __ATTR_RW(xps_rxqs);
1604 #endif /* CONFIG_XPS */
1605
1606 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1607         &queue_trans_timeout.attr,
1608         &queue_traffic_class.attr,
1609 #ifdef CONFIG_XPS
1610         &xps_cpus_attribute.attr,
1611         &xps_rxqs_attribute.attr,
1612         &queue_tx_maxrate.attr,
1613 #endif
1614         NULL
1615 };
1616 ATTRIBUTE_GROUPS(netdev_queue_default);
1617
1618 static void netdev_queue_release(struct kobject *kobj)
1619 {
1620         struct netdev_queue *queue = to_netdev_queue(kobj);
1621
1622         memset(kobj, 0, sizeof(*kobj));
1623         dev_put_track(queue->dev, &queue->dev_tracker);
1624 }
1625
1626 static const void *netdev_queue_namespace(struct kobject *kobj)
1627 {
1628         struct netdev_queue *queue = to_netdev_queue(kobj);
1629         struct device *dev = &queue->dev->dev;
1630         const void *ns = NULL;
1631
1632         if (dev->class && dev->class->ns_type)
1633                 ns = dev->class->namespace(dev);
1634
1635         return ns;
1636 }
1637
1638 static void netdev_queue_get_ownership(struct kobject *kobj,
1639                                        kuid_t *uid, kgid_t *gid)
1640 {
1641         const struct net *net = netdev_queue_namespace(kobj);
1642
1643         net_ns_get_ownership(net, uid, gid);
1644 }
1645
1646 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1647         .sysfs_ops = &netdev_queue_sysfs_ops,
1648         .release = netdev_queue_release,
1649         .default_groups = netdev_queue_default_groups,
1650         .namespace = netdev_queue_namespace,
1651         .get_ownership = netdev_queue_get_ownership,
1652 };
1653
1654 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1655 {
1656         struct netdev_queue *queue = dev->_tx + index;
1657         struct kobject *kobj = &queue->kobj;
1658         int error = 0;
1659
1660         /* Kobject_put later will trigger netdev_queue_release call
1661          * which decreases dev refcount: Take that reference here
1662          */
1663         dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1664
1665         kobj->kset = dev->queues_kset;
1666         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1667                                      "tx-%u", index);
1668         if (error)
1669                 goto err;
1670
1671 #ifdef CONFIG_BQL
1672         error = sysfs_create_group(kobj, &dql_group);
1673         if (error)
1674                 goto err;
1675 #endif
1676
1677         kobject_uevent(kobj, KOBJ_ADD);
1678         return 0;
1679
1680 err:
1681         kobject_put(kobj);
1682         return error;
1683 }
1684
1685 static int tx_queue_change_owner(struct net_device *ndev, int index,
1686                                  kuid_t kuid, kgid_t kgid)
1687 {
1688         struct netdev_queue *queue = ndev->_tx + index;
1689         struct kobject *kobj = &queue->kobj;
1690         int error;
1691
1692         error = sysfs_change_owner(kobj, kuid, kgid);
1693         if (error)
1694                 return error;
1695
1696 #ifdef CONFIG_BQL
1697         error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1698 #endif
1699         return error;
1700 }
1701 #endif /* CONFIG_SYSFS */
1702
1703 int
1704 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1705 {
1706 #ifdef CONFIG_SYSFS
1707         int i;
1708         int error = 0;
1709
1710         /* Tx queue kobjects are allowed to be updated when a device is being
1711          * unregistered, but solely to remove queues from qdiscs. Any path
1712          * adding queues should be fixed.
1713          */
1714         WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1715              "New queues can't be registered after device unregistration.");
1716
1717         for (i = old_num; i < new_num; i++) {
1718                 error = netdev_queue_add_kobject(dev, i);
1719                 if (error) {
1720                         new_num = old_num;
1721                         break;
1722                 }
1723         }
1724
1725         while (--i >= new_num) {
1726                 struct netdev_queue *queue = dev->_tx + i;
1727
1728                 if (!refcount_read(&dev_net(dev)->ns.count))
1729                         queue->kobj.uevent_suppress = 1;
1730 #ifdef CONFIG_BQL
1731                 sysfs_remove_group(&queue->kobj, &dql_group);
1732 #endif
1733                 kobject_put(&queue->kobj);
1734         }
1735
1736         return error;
1737 #else
1738         return 0;
1739 #endif /* CONFIG_SYSFS */
1740 }
1741
1742 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1743                                      kuid_t kuid, kgid_t kgid)
1744 {
1745 #ifdef CONFIG_SYSFS
1746         int error = 0;
1747         int i;
1748
1749         for (i = 0; i < num; i++) {
1750                 error = tx_queue_change_owner(dev, i, kuid, kgid);
1751                 if (error)
1752                         break;
1753         }
1754
1755         return error;
1756 #else
1757         return 0;
1758 #endif /* CONFIG_SYSFS */
1759 }
1760
1761 static int register_queue_kobjects(struct net_device *dev)
1762 {
1763         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1764
1765 #ifdef CONFIG_SYSFS
1766         dev->queues_kset = kset_create_and_add("queues",
1767                                                NULL, &dev->dev.kobj);
1768         if (!dev->queues_kset)
1769                 return -ENOMEM;
1770         real_rx = dev->real_num_rx_queues;
1771 #endif
1772         real_tx = dev->real_num_tx_queues;
1773
1774         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1775         if (error)
1776                 goto error;
1777         rxq = real_rx;
1778
1779         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1780         if (error)
1781                 goto error;
1782         txq = real_tx;
1783
1784         return 0;
1785
1786 error:
1787         netdev_queue_update_kobjects(dev, txq, 0);
1788         net_rx_queue_update_kobjects(dev, rxq, 0);
1789 #ifdef CONFIG_SYSFS
1790         kset_unregister(dev->queues_kset);
1791 #endif
1792         return error;
1793 }
1794
1795 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1796 {
1797         int error = 0, real_rx = 0, real_tx = 0;
1798
1799 #ifdef CONFIG_SYSFS
1800         if (ndev->queues_kset) {
1801                 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1802                 if (error)
1803                         return error;
1804         }
1805         real_rx = ndev->real_num_rx_queues;
1806 #endif
1807         real_tx = ndev->real_num_tx_queues;
1808
1809         error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1810         if (error)
1811                 return error;
1812
1813         error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1814         if (error)
1815                 return error;
1816
1817         return 0;
1818 }
1819
1820 static void remove_queue_kobjects(struct net_device *dev)
1821 {
1822         int real_rx = 0, real_tx = 0;
1823
1824 #ifdef CONFIG_SYSFS
1825         real_rx = dev->real_num_rx_queues;
1826 #endif
1827         real_tx = dev->real_num_tx_queues;
1828
1829         net_rx_queue_update_kobjects(dev, real_rx, 0);
1830         netdev_queue_update_kobjects(dev, real_tx, 0);
1831
1832         dev->real_num_rx_queues = 0;
1833         dev->real_num_tx_queues = 0;
1834 #ifdef CONFIG_SYSFS
1835         kset_unregister(dev->queues_kset);
1836 #endif
1837 }
1838
1839 static bool net_current_may_mount(void)
1840 {
1841         struct net *net = current->nsproxy->net_ns;
1842
1843         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1844 }
1845
1846 static void *net_grab_current_ns(void)
1847 {
1848         struct net *ns = current->nsproxy->net_ns;
1849 #ifdef CONFIG_NET_NS
1850         if (ns)
1851                 refcount_inc(&ns->passive);
1852 #endif
1853         return ns;
1854 }
1855
1856 static const void *net_initial_ns(void)
1857 {
1858         return &init_net;
1859 }
1860
1861 static const void *net_netlink_ns(struct sock *sk)
1862 {
1863         return sock_net(sk);
1864 }
1865
1866 const struct kobj_ns_type_operations net_ns_type_operations = {
1867         .type = KOBJ_NS_TYPE_NET,
1868         .current_may_mount = net_current_may_mount,
1869         .grab_current_ns = net_grab_current_ns,
1870         .netlink_ns = net_netlink_ns,
1871         .initial_ns = net_initial_ns,
1872         .drop_ns = net_drop_ns,
1873 };
1874 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1875
1876 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1877 {
1878         struct net_device *dev = to_net_dev(d);
1879         int retval;
1880
1881         /* pass interface to uevent. */
1882         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1883         if (retval)
1884                 goto exit;
1885
1886         /* pass ifindex to uevent.
1887          * ifindex is useful as it won't change (interface name may change)
1888          * and is what RtNetlink uses natively.
1889          */
1890         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1891
1892 exit:
1893         return retval;
1894 }
1895
1896 /*
1897  *      netdev_release -- destroy and free a dead device.
1898  *      Called when last reference to device kobject is gone.
1899  */
1900 static void netdev_release(struct device *d)
1901 {
1902         struct net_device *dev = to_net_dev(d);
1903
1904         BUG_ON(dev->reg_state != NETREG_RELEASED);
1905
1906         /* no need to wait for rcu grace period:
1907          * device is dead and about to be freed.
1908          */
1909         kfree(rcu_access_pointer(dev->ifalias));
1910         netdev_freemem(dev);
1911 }
1912
1913 static const void *net_namespace(struct device *d)
1914 {
1915         struct net_device *dev = to_net_dev(d);
1916
1917         return dev_net(dev);
1918 }
1919
1920 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1921 {
1922         struct net_device *dev = to_net_dev(d);
1923         const struct net *net = dev_net(dev);
1924
1925         net_ns_get_ownership(net, uid, gid);
1926 }
1927
1928 static struct class net_class __ro_after_init = {
1929         .name = "net",
1930         .dev_release = netdev_release,
1931         .dev_groups = net_class_groups,
1932         .dev_uevent = netdev_uevent,
1933         .ns_type = &net_ns_type_operations,
1934         .namespace = net_namespace,
1935         .get_ownership = net_get_ownership,
1936 };
1937
1938 #ifdef CONFIG_OF
1939 static int of_dev_node_match(struct device *dev, const void *data)
1940 {
1941         for (; dev; dev = dev->parent) {
1942                 if (dev->of_node == data)
1943                         return 1;
1944         }
1945
1946         return 0;
1947 }
1948
1949 /*
1950  * of_find_net_device_by_node - lookup the net device for the device node
1951  * @np: OF device node
1952  *
1953  * Looks up the net_device structure corresponding with the device node.
1954  * If successful, returns a pointer to the net_device with the embedded
1955  * struct device refcount incremented by one, or NULL on failure. The
1956  * refcount must be dropped when done with the net_device.
1957  */
1958 struct net_device *of_find_net_device_by_node(struct device_node *np)
1959 {
1960         struct device *dev;
1961
1962         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1963         if (!dev)
1964                 return NULL;
1965
1966         return to_net_dev(dev);
1967 }
1968 EXPORT_SYMBOL(of_find_net_device_by_node);
1969 #endif
1970
1971 /* Delete sysfs entries but hold kobject reference until after all
1972  * netdev references are gone.
1973  */
1974 void netdev_unregister_kobject(struct net_device *ndev)
1975 {
1976         struct device *dev = &ndev->dev;
1977
1978         if (!refcount_read(&dev_net(ndev)->ns.count))
1979                 dev_set_uevent_suppress(dev, 1);
1980
1981         kobject_get(&dev->kobj);
1982
1983         remove_queue_kobjects(ndev);
1984
1985         pm_runtime_set_memalloc_noio(dev, false);
1986
1987         device_del(dev);
1988 }
1989
1990 /* Create sysfs entries for network device. */
1991 int netdev_register_kobject(struct net_device *ndev)
1992 {
1993         struct device *dev = &ndev->dev;
1994         const struct attribute_group **groups = ndev->sysfs_groups;
1995         int error = 0;
1996
1997         device_initialize(dev);
1998         dev->class = &net_class;
1999         dev->platform_data = ndev;
2000         dev->groups = groups;
2001
2002         dev_set_name(dev, "%s", ndev->name);
2003
2004 #ifdef CONFIG_SYSFS
2005         /* Allow for a device specific group */
2006         if (*groups)
2007                 groups++;
2008
2009         *groups++ = &netstat_group;
2010
2011         if (wireless_group_needed(ndev))
2012                 *groups++ = &wireless_group;
2013 #endif /* CONFIG_SYSFS */
2014
2015         error = device_add(dev);
2016         if (error)
2017                 return error;
2018
2019         error = register_queue_kobjects(ndev);
2020         if (error) {
2021                 device_del(dev);
2022                 return error;
2023         }
2024
2025         pm_runtime_set_memalloc_noio(dev, true);
2026
2027         return error;
2028 }
2029
2030 /* Change owner for sysfs entries when moving network devices across network
2031  * namespaces owned by different user namespaces.
2032  */
2033 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2034                         const struct net *net_new)
2035 {
2036         kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2037         kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2038         struct device *dev = &ndev->dev;
2039         int error;
2040
2041         net_ns_get_ownership(net_old, &old_uid, &old_gid);
2042         net_ns_get_ownership(net_new, &new_uid, &new_gid);
2043
2044         /* The network namespace was changed but the owning user namespace is
2045          * identical so there's no need to change the owner of sysfs entries.
2046          */
2047         if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2048                 return 0;
2049
2050         error = device_change_owner(dev, new_uid, new_gid);
2051         if (error)
2052                 return error;
2053
2054         error = queue_change_owner(ndev, new_uid, new_gid);
2055         if (error)
2056                 return error;
2057
2058         return 0;
2059 }
2060
2061 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2062                                 const void *ns)
2063 {
2064         return class_create_file_ns(&net_class, class_attr, ns);
2065 }
2066 EXPORT_SYMBOL(netdev_class_create_file_ns);
2067
2068 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2069                                  const void *ns)
2070 {
2071         class_remove_file_ns(&net_class, class_attr, ns);
2072 }
2073 EXPORT_SYMBOL(netdev_class_remove_file_ns);
2074
2075 int __init netdev_kobject_init(void)
2076 {
2077         kobj_ns_type_register(&net_ns_type_operations);
2078         return class_register(&net_class);
2079 }