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