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