1 /* 2 * net-sysfs.c - network device class and attributes 3 * 4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/capability.h> 13 #include <linux/kernel.h> 14 #include <linux/netdevice.h> 15 #include <net/switchdev.h> 16 #include <linux/if_arp.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/nsproxy.h> 20 #include <net/sock.h> 21 #include <net/net_namespace.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/vmalloc.h> 24 #include <linux/export.h> 25 #include <linux/jiffies.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/of.h> 28 #include <linux/of_net.h> 29 30 #include "net-sysfs.h" 31 32 #ifdef CONFIG_SYSFS 33 static const char fmt_hex[] = "%#x\n"; 34 static const char fmt_dec[] = "%d\n"; 35 static const char fmt_ulong[] = "%lu\n"; 36 static const char fmt_u64[] = "%llu\n"; 37 38 static inline int dev_isalive(const struct net_device *dev) 39 { 40 return dev->reg_state <= NETREG_REGISTERED; 41 } 42 43 /* use same locking rules as GIF* ioctl's */ 44 static ssize_t netdev_show(const struct device *dev, 45 struct device_attribute *attr, char *buf, 46 ssize_t (*format)(const struct net_device *, char *)) 47 { 48 struct net_device *ndev = to_net_dev(dev); 49 ssize_t ret = -EINVAL; 50 51 read_lock(&dev_base_lock); 52 if (dev_isalive(ndev)) 53 ret = (*format)(ndev, buf); 54 read_unlock(&dev_base_lock); 55 56 return ret; 57 } 58 59 /* generate a show function for simple field */ 60 #define NETDEVICE_SHOW(field, format_string) \ 61 static ssize_t format_##field(const struct net_device *dev, char *buf) \ 62 { \ 63 return sprintf(buf, format_string, dev->field); \ 64 } \ 65 static ssize_t field##_show(struct device *dev, \ 66 struct device_attribute *attr, char *buf) \ 67 { \ 68 return netdev_show(dev, attr, buf, format_##field); \ 69 } \ 70 71 #define NETDEVICE_SHOW_RO(field, format_string) \ 72 NETDEVICE_SHOW(field, format_string); \ 73 static DEVICE_ATTR_RO(field) 74 75 #define NETDEVICE_SHOW_RW(field, format_string) \ 76 NETDEVICE_SHOW(field, format_string); \ 77 static DEVICE_ATTR_RW(field) 78 79 /* use same locking and permission rules as SIF* ioctl's */ 80 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 81 const char *buf, size_t len, 82 int (*set)(struct net_device *, unsigned long)) 83 { 84 struct net_device *netdev = to_net_dev(dev); 85 struct net *net = dev_net(netdev); 86 unsigned long new; 87 int ret = -EINVAL; 88 89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 90 return -EPERM; 91 92 ret = kstrtoul(buf, 0, &new); 93 if (ret) 94 goto err; 95 96 if (!rtnl_trylock()) 97 return restart_syscall(); 98 99 if (dev_isalive(netdev)) { 100 ret = (*set)(netdev, new); 101 if (ret == 0) 102 ret = len; 103 } 104 rtnl_unlock(); 105 err: 106 return ret; 107 } 108 109 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 110 NETDEVICE_SHOW_RO(dev_port, fmt_dec); 111 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 112 NETDEVICE_SHOW_RO(addr_len, fmt_dec); 113 NETDEVICE_SHOW_RO(ifindex, fmt_dec); 114 NETDEVICE_SHOW_RO(type, fmt_dec); 115 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 116 117 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, 118 char *buf) 119 { 120 struct net_device *ndev = to_net_dev(dev); 121 122 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 123 } 124 static DEVICE_ATTR_RO(iflink); 125 126 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 127 { 128 return sprintf(buf, fmt_dec, dev->name_assign_type); 129 } 130 131 static ssize_t name_assign_type_show(struct device *dev, 132 struct device_attribute *attr, 133 char *buf) 134 { 135 struct net_device *ndev = to_net_dev(dev); 136 ssize_t ret = -EINVAL; 137 138 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 139 ret = netdev_show(dev, attr, buf, format_name_assign_type); 140 141 return ret; 142 } 143 static DEVICE_ATTR_RO(name_assign_type); 144 145 /* use same locking rules as GIFHWADDR ioctl's */ 146 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 147 char *buf) 148 { 149 struct net_device *ndev = to_net_dev(dev); 150 ssize_t ret = -EINVAL; 151 152 read_lock(&dev_base_lock); 153 if (dev_isalive(ndev)) 154 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 155 read_unlock(&dev_base_lock); 156 return ret; 157 } 158 static DEVICE_ATTR_RO(address); 159 160 static ssize_t broadcast_show(struct device *dev, 161 struct device_attribute *attr, char *buf) 162 { 163 struct net_device *ndev = to_net_dev(dev); 164 165 if (dev_isalive(ndev)) 166 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 167 return -EINVAL; 168 } 169 static DEVICE_ATTR_RO(broadcast); 170 171 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 172 { 173 if (!netif_running(dev)) 174 return -EINVAL; 175 return dev_change_carrier(dev, (bool)new_carrier); 176 } 177 178 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 179 const char *buf, size_t len) 180 { 181 return netdev_store(dev, attr, buf, len, change_carrier); 182 } 183 184 static ssize_t carrier_show(struct device *dev, 185 struct device_attribute *attr, char *buf) 186 { 187 struct net_device *netdev = to_net_dev(dev); 188 189 if (netif_running(netdev)) 190 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 191 192 return -EINVAL; 193 } 194 static DEVICE_ATTR_RW(carrier); 195 196 static ssize_t speed_show(struct device *dev, 197 struct device_attribute *attr, char *buf) 198 { 199 struct net_device *netdev = to_net_dev(dev); 200 int ret = -EINVAL; 201 202 if (!rtnl_trylock()) 203 return restart_syscall(); 204 205 if (netif_running(netdev)) { 206 struct ethtool_link_ksettings cmd; 207 208 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 209 ret = sprintf(buf, fmt_dec, cmd.base.speed); 210 } 211 rtnl_unlock(); 212 return ret; 213 } 214 static DEVICE_ATTR_RO(speed); 215 216 static ssize_t duplex_show(struct device *dev, 217 struct device_attribute *attr, char *buf) 218 { 219 struct net_device *netdev = to_net_dev(dev); 220 int ret = -EINVAL; 221 222 if (!rtnl_trylock()) 223 return restart_syscall(); 224 225 if (netif_running(netdev)) { 226 struct ethtool_link_ksettings cmd; 227 228 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 229 const char *duplex; 230 231 switch (cmd.base.duplex) { 232 case DUPLEX_HALF: 233 duplex = "half"; 234 break; 235 case DUPLEX_FULL: 236 duplex = "full"; 237 break; 238 default: 239 duplex = "unknown"; 240 break; 241 } 242 ret = sprintf(buf, "%s\n", duplex); 243 } 244 } 245 rtnl_unlock(); 246 return ret; 247 } 248 static DEVICE_ATTR_RO(duplex); 249 250 static ssize_t dormant_show(struct device *dev, 251 struct device_attribute *attr, char *buf) 252 { 253 struct net_device *netdev = to_net_dev(dev); 254 255 if (netif_running(netdev)) 256 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 257 258 return -EINVAL; 259 } 260 static DEVICE_ATTR_RO(dormant); 261 262 static const char *const operstates[] = { 263 "unknown", 264 "notpresent", /* currently unused */ 265 "down", 266 "lowerlayerdown", 267 "testing", /* currently unused */ 268 "dormant", 269 "up" 270 }; 271 272 static ssize_t operstate_show(struct device *dev, 273 struct device_attribute *attr, char *buf) 274 { 275 const struct net_device *netdev = to_net_dev(dev); 276 unsigned char operstate; 277 278 read_lock(&dev_base_lock); 279 operstate = netdev->operstate; 280 if (!netif_running(netdev)) 281 operstate = IF_OPER_DOWN; 282 read_unlock(&dev_base_lock); 283 284 if (operstate >= ARRAY_SIZE(operstates)) 285 return -EINVAL; /* should not happen */ 286 287 return sprintf(buf, "%s\n", operstates[operstate]); 288 } 289 static DEVICE_ATTR_RO(operstate); 290 291 static ssize_t carrier_changes_show(struct device *dev, 292 struct device_attribute *attr, 293 char *buf) 294 { 295 struct net_device *netdev = to_net_dev(dev); 296 297 return sprintf(buf, fmt_dec, 298 atomic_read(&netdev->carrier_changes)); 299 } 300 static DEVICE_ATTR_RO(carrier_changes); 301 302 /* read-write attributes */ 303 304 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 305 { 306 return dev_set_mtu(dev, (int)new_mtu); 307 } 308 309 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 310 const char *buf, size_t len) 311 { 312 return netdev_store(dev, attr, buf, len, change_mtu); 313 } 314 NETDEVICE_SHOW_RW(mtu, fmt_dec); 315 316 static int change_flags(struct net_device *dev, unsigned long new_flags) 317 { 318 return dev_change_flags(dev, (unsigned int)new_flags); 319 } 320 321 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 322 const char *buf, size_t len) 323 { 324 return netdev_store(dev, attr, buf, len, change_flags); 325 } 326 NETDEVICE_SHOW_RW(flags, fmt_hex); 327 328 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 329 { 330 unsigned int orig_len = dev->tx_queue_len; 331 int res; 332 333 if (new_len != (unsigned int)new_len) 334 return -ERANGE; 335 336 if (new_len != orig_len) { 337 dev->tx_queue_len = new_len; 338 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); 339 res = notifier_to_errno(res); 340 if (res) { 341 netdev_err(dev, 342 "refused to change device tx_queue_len\n"); 343 dev->tx_queue_len = orig_len; 344 return -EFAULT; 345 } 346 } 347 348 return 0; 349 } 350 351 static ssize_t tx_queue_len_store(struct device *dev, 352 struct device_attribute *attr, 353 const char *buf, size_t len) 354 { 355 if (!capable(CAP_NET_ADMIN)) 356 return -EPERM; 357 358 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 359 } 360 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); 361 362 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 363 { 364 dev->gro_flush_timeout = val; 365 return 0; 366 } 367 368 static ssize_t gro_flush_timeout_store(struct device *dev, 369 struct device_attribute *attr, 370 const char *buf, size_t len) 371 { 372 if (!capable(CAP_NET_ADMIN)) 373 return -EPERM; 374 375 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 376 } 377 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 378 379 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 380 const char *buf, size_t len) 381 { 382 struct net_device *netdev = to_net_dev(dev); 383 struct net *net = dev_net(netdev); 384 size_t count = len; 385 ssize_t ret; 386 387 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 388 return -EPERM; 389 390 /* ignore trailing newline */ 391 if (len > 0 && buf[len - 1] == '\n') 392 --count; 393 394 if (!rtnl_trylock()) 395 return restart_syscall(); 396 ret = dev_set_alias(netdev, buf, count); 397 rtnl_unlock(); 398 399 return ret < 0 ? ret : len; 400 } 401 402 static ssize_t ifalias_show(struct device *dev, 403 struct device_attribute *attr, char *buf) 404 { 405 const struct net_device *netdev = to_net_dev(dev); 406 ssize_t ret = 0; 407 408 if (!rtnl_trylock()) 409 return restart_syscall(); 410 if (netdev->ifalias) 411 ret = sprintf(buf, "%s\n", netdev->ifalias); 412 rtnl_unlock(); 413 return ret; 414 } 415 static DEVICE_ATTR_RW(ifalias); 416 417 static int change_group(struct net_device *dev, unsigned long new_group) 418 { 419 dev_set_group(dev, (int)new_group); 420 return 0; 421 } 422 423 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 424 const char *buf, size_t len) 425 { 426 return netdev_store(dev, attr, buf, len, change_group); 427 } 428 NETDEVICE_SHOW(group, fmt_dec); 429 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 430 431 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 432 { 433 return dev_change_proto_down(dev, (bool)proto_down); 434 } 435 436 static ssize_t proto_down_store(struct device *dev, 437 struct device_attribute *attr, 438 const char *buf, size_t len) 439 { 440 return netdev_store(dev, attr, buf, len, change_proto_down); 441 } 442 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 443 444 static ssize_t phys_port_id_show(struct device *dev, 445 struct device_attribute *attr, char *buf) 446 { 447 struct net_device *netdev = to_net_dev(dev); 448 ssize_t ret = -EINVAL; 449 450 if (!rtnl_trylock()) 451 return restart_syscall(); 452 453 if (dev_isalive(netdev)) { 454 struct netdev_phys_item_id ppid; 455 456 ret = dev_get_phys_port_id(netdev, &ppid); 457 if (!ret) 458 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 459 } 460 rtnl_unlock(); 461 462 return ret; 463 } 464 static DEVICE_ATTR_RO(phys_port_id); 465 466 static ssize_t phys_port_name_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468 { 469 struct net_device *netdev = to_net_dev(dev); 470 ssize_t ret = -EINVAL; 471 472 if (!rtnl_trylock()) 473 return restart_syscall(); 474 475 if (dev_isalive(netdev)) { 476 char name[IFNAMSIZ]; 477 478 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 479 if (!ret) 480 ret = sprintf(buf, "%s\n", name); 481 } 482 rtnl_unlock(); 483 484 return ret; 485 } 486 static DEVICE_ATTR_RO(phys_port_name); 487 488 static ssize_t phys_switch_id_show(struct device *dev, 489 struct device_attribute *attr, char *buf) 490 { 491 struct net_device *netdev = to_net_dev(dev); 492 ssize_t ret = -EINVAL; 493 494 if (!rtnl_trylock()) 495 return restart_syscall(); 496 497 if (dev_isalive(netdev)) { 498 struct switchdev_attr attr = { 499 .orig_dev = netdev, 500 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 501 .flags = SWITCHDEV_F_NO_RECURSE, 502 }; 503 504 ret = switchdev_port_attr_get(netdev, &attr); 505 if (!ret) 506 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 507 attr.u.ppid.id); 508 } 509 rtnl_unlock(); 510 511 return ret; 512 } 513 static DEVICE_ATTR_RO(phys_switch_id); 514 515 static struct attribute *net_class_attrs[] __ro_after_init = { 516 &dev_attr_netdev_group.attr, 517 &dev_attr_type.attr, 518 &dev_attr_dev_id.attr, 519 &dev_attr_dev_port.attr, 520 &dev_attr_iflink.attr, 521 &dev_attr_ifindex.attr, 522 &dev_attr_name_assign_type.attr, 523 &dev_attr_addr_assign_type.attr, 524 &dev_attr_addr_len.attr, 525 &dev_attr_link_mode.attr, 526 &dev_attr_address.attr, 527 &dev_attr_broadcast.attr, 528 &dev_attr_speed.attr, 529 &dev_attr_duplex.attr, 530 &dev_attr_dormant.attr, 531 &dev_attr_operstate.attr, 532 &dev_attr_carrier_changes.attr, 533 &dev_attr_ifalias.attr, 534 &dev_attr_carrier.attr, 535 &dev_attr_mtu.attr, 536 &dev_attr_flags.attr, 537 &dev_attr_tx_queue_len.attr, 538 &dev_attr_gro_flush_timeout.attr, 539 &dev_attr_phys_port_id.attr, 540 &dev_attr_phys_port_name.attr, 541 &dev_attr_phys_switch_id.attr, 542 &dev_attr_proto_down.attr, 543 NULL, 544 }; 545 ATTRIBUTE_GROUPS(net_class); 546 547 /* Show a given an attribute in the statistics group */ 548 static ssize_t netstat_show(const struct device *d, 549 struct device_attribute *attr, char *buf, 550 unsigned long offset) 551 { 552 struct net_device *dev = to_net_dev(d); 553 ssize_t ret = -EINVAL; 554 555 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 556 offset % sizeof(u64) != 0); 557 558 read_lock(&dev_base_lock); 559 if (dev_isalive(dev)) { 560 struct rtnl_link_stats64 temp; 561 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 562 563 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset)); 564 } 565 read_unlock(&dev_base_lock); 566 return ret; 567 } 568 569 /* generate a read-only statistics attribute */ 570 #define NETSTAT_ENTRY(name) \ 571 static ssize_t name##_show(struct device *d, \ 572 struct device_attribute *attr, char *buf) \ 573 { \ 574 return netstat_show(d, attr, buf, \ 575 offsetof(struct rtnl_link_stats64, name)); \ 576 } \ 577 static DEVICE_ATTR_RO(name) 578 579 NETSTAT_ENTRY(rx_packets); 580 NETSTAT_ENTRY(tx_packets); 581 NETSTAT_ENTRY(rx_bytes); 582 NETSTAT_ENTRY(tx_bytes); 583 NETSTAT_ENTRY(rx_errors); 584 NETSTAT_ENTRY(tx_errors); 585 NETSTAT_ENTRY(rx_dropped); 586 NETSTAT_ENTRY(tx_dropped); 587 NETSTAT_ENTRY(multicast); 588 NETSTAT_ENTRY(collisions); 589 NETSTAT_ENTRY(rx_length_errors); 590 NETSTAT_ENTRY(rx_over_errors); 591 NETSTAT_ENTRY(rx_crc_errors); 592 NETSTAT_ENTRY(rx_frame_errors); 593 NETSTAT_ENTRY(rx_fifo_errors); 594 NETSTAT_ENTRY(rx_missed_errors); 595 NETSTAT_ENTRY(tx_aborted_errors); 596 NETSTAT_ENTRY(tx_carrier_errors); 597 NETSTAT_ENTRY(tx_fifo_errors); 598 NETSTAT_ENTRY(tx_heartbeat_errors); 599 NETSTAT_ENTRY(tx_window_errors); 600 NETSTAT_ENTRY(rx_compressed); 601 NETSTAT_ENTRY(tx_compressed); 602 NETSTAT_ENTRY(rx_nohandler); 603 604 static struct attribute *netstat_attrs[] __ro_after_init = { 605 &dev_attr_rx_packets.attr, 606 &dev_attr_tx_packets.attr, 607 &dev_attr_rx_bytes.attr, 608 &dev_attr_tx_bytes.attr, 609 &dev_attr_rx_errors.attr, 610 &dev_attr_tx_errors.attr, 611 &dev_attr_rx_dropped.attr, 612 &dev_attr_tx_dropped.attr, 613 &dev_attr_multicast.attr, 614 &dev_attr_collisions.attr, 615 &dev_attr_rx_length_errors.attr, 616 &dev_attr_rx_over_errors.attr, 617 &dev_attr_rx_crc_errors.attr, 618 &dev_attr_rx_frame_errors.attr, 619 &dev_attr_rx_fifo_errors.attr, 620 &dev_attr_rx_missed_errors.attr, 621 &dev_attr_tx_aborted_errors.attr, 622 &dev_attr_tx_carrier_errors.attr, 623 &dev_attr_tx_fifo_errors.attr, 624 &dev_attr_tx_heartbeat_errors.attr, 625 &dev_attr_tx_window_errors.attr, 626 &dev_attr_rx_compressed.attr, 627 &dev_attr_tx_compressed.attr, 628 &dev_attr_rx_nohandler.attr, 629 NULL 630 }; 631 632 static const struct attribute_group netstat_group = { 633 .name = "statistics", 634 .attrs = netstat_attrs, 635 }; 636 637 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 638 static struct attribute *wireless_attrs[] = { 639 NULL 640 }; 641 642 static const struct attribute_group wireless_group = { 643 .name = "wireless", 644 .attrs = wireless_attrs, 645 }; 646 #endif 647 648 #else /* CONFIG_SYSFS */ 649 #define net_class_groups NULL 650 #endif /* CONFIG_SYSFS */ 651 652 #ifdef CONFIG_SYSFS 653 #define to_rx_queue_attr(_attr) \ 654 container_of(_attr, struct rx_queue_attribute, attr) 655 656 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 657 658 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 659 char *buf) 660 { 661 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 662 struct netdev_rx_queue *queue = to_rx_queue(kobj); 663 664 if (!attribute->show) 665 return -EIO; 666 667 return attribute->show(queue, buf); 668 } 669 670 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 671 const char *buf, size_t count) 672 { 673 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 674 struct netdev_rx_queue *queue = to_rx_queue(kobj); 675 676 if (!attribute->store) 677 return -EIO; 678 679 return attribute->store(queue, buf, count); 680 } 681 682 static const struct sysfs_ops rx_queue_sysfs_ops = { 683 .show = rx_queue_attr_show, 684 .store = rx_queue_attr_store, 685 }; 686 687 #ifdef CONFIG_RPS 688 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf) 689 { 690 struct rps_map *map; 691 cpumask_var_t mask; 692 int i, len; 693 694 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 695 return -ENOMEM; 696 697 rcu_read_lock(); 698 map = rcu_dereference(queue->rps_map); 699 if (map) 700 for (i = 0; i < map->len; i++) 701 cpumask_set_cpu(map->cpus[i], mask); 702 703 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 704 rcu_read_unlock(); 705 free_cpumask_var(mask); 706 707 return len < PAGE_SIZE ? len : -EINVAL; 708 } 709 710 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 711 const char *buf, size_t len) 712 { 713 struct rps_map *old_map, *map; 714 cpumask_var_t mask; 715 int err, cpu, i; 716 static DEFINE_MUTEX(rps_map_mutex); 717 718 if (!capable(CAP_NET_ADMIN)) 719 return -EPERM; 720 721 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 722 return -ENOMEM; 723 724 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 725 if (err) { 726 free_cpumask_var(mask); 727 return err; 728 } 729 730 map = kzalloc(max_t(unsigned int, 731 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 732 GFP_KERNEL); 733 if (!map) { 734 free_cpumask_var(mask); 735 return -ENOMEM; 736 } 737 738 i = 0; 739 for_each_cpu_and(cpu, mask, cpu_online_mask) 740 map->cpus[i++] = cpu; 741 742 if (i) { 743 map->len = i; 744 } else { 745 kfree(map); 746 map = NULL; 747 } 748 749 mutex_lock(&rps_map_mutex); 750 old_map = rcu_dereference_protected(queue->rps_map, 751 mutex_is_locked(&rps_map_mutex)); 752 rcu_assign_pointer(queue->rps_map, map); 753 754 if (map) 755 static_key_slow_inc(&rps_needed); 756 if (old_map) 757 static_key_slow_dec(&rps_needed); 758 759 mutex_unlock(&rps_map_mutex); 760 761 if (old_map) 762 kfree_rcu(old_map, rcu); 763 764 free_cpumask_var(mask); 765 return len; 766 } 767 768 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 769 char *buf) 770 { 771 struct rps_dev_flow_table *flow_table; 772 unsigned long val = 0; 773 774 rcu_read_lock(); 775 flow_table = rcu_dereference(queue->rps_flow_table); 776 if (flow_table) 777 val = (unsigned long)flow_table->mask + 1; 778 rcu_read_unlock(); 779 780 return sprintf(buf, "%lu\n", val); 781 } 782 783 static void rps_dev_flow_table_release(struct rcu_head *rcu) 784 { 785 struct rps_dev_flow_table *table = container_of(rcu, 786 struct rps_dev_flow_table, rcu); 787 vfree(table); 788 } 789 790 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 791 const char *buf, size_t len) 792 { 793 unsigned long mask, count; 794 struct rps_dev_flow_table *table, *old_table; 795 static DEFINE_SPINLOCK(rps_dev_flow_lock); 796 int rc; 797 798 if (!capable(CAP_NET_ADMIN)) 799 return -EPERM; 800 801 rc = kstrtoul(buf, 0, &count); 802 if (rc < 0) 803 return rc; 804 805 if (count) { 806 mask = count - 1; 807 /* mask = roundup_pow_of_two(count) - 1; 808 * without overflows... 809 */ 810 while ((mask | (mask >> 1)) != mask) 811 mask |= (mask >> 1); 812 /* On 64 bit arches, must check mask fits in table->mask (u32), 813 * and on 32bit arches, must check 814 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 815 */ 816 #if BITS_PER_LONG > 32 817 if (mask > (unsigned long)(u32)mask) 818 return -EINVAL; 819 #else 820 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 821 / sizeof(struct rps_dev_flow)) { 822 /* Enforce a limit to prevent overflow */ 823 return -EINVAL; 824 } 825 #endif 826 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 827 if (!table) 828 return -ENOMEM; 829 830 table->mask = mask; 831 for (count = 0; count <= mask; count++) 832 table->flows[count].cpu = RPS_NO_CPU; 833 } else { 834 table = NULL; 835 } 836 837 spin_lock(&rps_dev_flow_lock); 838 old_table = rcu_dereference_protected(queue->rps_flow_table, 839 lockdep_is_held(&rps_dev_flow_lock)); 840 rcu_assign_pointer(queue->rps_flow_table, table); 841 spin_unlock(&rps_dev_flow_lock); 842 843 if (old_table) 844 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 845 846 return len; 847 } 848 849 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init 850 = __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 851 852 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init 853 = __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 854 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 855 #endif /* CONFIG_RPS */ 856 857 static struct attribute *rx_queue_default_attrs[] __ro_after_init = { 858 #ifdef CONFIG_RPS 859 &rps_cpus_attribute.attr, 860 &rps_dev_flow_table_cnt_attribute.attr, 861 #endif 862 NULL 863 }; 864 865 static void rx_queue_release(struct kobject *kobj) 866 { 867 struct netdev_rx_queue *queue = to_rx_queue(kobj); 868 #ifdef CONFIG_RPS 869 struct rps_map *map; 870 struct rps_dev_flow_table *flow_table; 871 872 map = rcu_dereference_protected(queue->rps_map, 1); 873 if (map) { 874 RCU_INIT_POINTER(queue->rps_map, NULL); 875 kfree_rcu(map, rcu); 876 } 877 878 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 879 if (flow_table) { 880 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 881 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 882 } 883 #endif 884 885 memset(kobj, 0, sizeof(*kobj)); 886 dev_put(queue->dev); 887 } 888 889 static const void *rx_queue_namespace(struct kobject *kobj) 890 { 891 struct netdev_rx_queue *queue = to_rx_queue(kobj); 892 struct device *dev = &queue->dev->dev; 893 const void *ns = NULL; 894 895 if (dev->class && dev->class->ns_type) 896 ns = dev->class->namespace(dev); 897 898 return ns; 899 } 900 901 static struct kobj_type rx_queue_ktype __ro_after_init = { 902 .sysfs_ops = &rx_queue_sysfs_ops, 903 .release = rx_queue_release, 904 .default_attrs = rx_queue_default_attrs, 905 .namespace = rx_queue_namespace 906 }; 907 908 static int rx_queue_add_kobject(struct net_device *dev, int index) 909 { 910 struct netdev_rx_queue *queue = dev->_rx + index; 911 struct kobject *kobj = &queue->kobj; 912 int error = 0; 913 914 kobj->kset = dev->queues_kset; 915 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 916 "rx-%u", index); 917 if (error) 918 return error; 919 920 if (dev->sysfs_rx_queue_group) { 921 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 922 if (error) { 923 kobject_put(kobj); 924 return error; 925 } 926 } 927 928 kobject_uevent(kobj, KOBJ_ADD); 929 dev_hold(queue->dev); 930 931 return error; 932 } 933 #endif /* CONFIG_SYSFS */ 934 935 int 936 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 937 { 938 #ifdef CONFIG_SYSFS 939 int i; 940 int error = 0; 941 942 #ifndef CONFIG_RPS 943 if (!dev->sysfs_rx_queue_group) 944 return 0; 945 #endif 946 for (i = old_num; i < new_num; i++) { 947 error = rx_queue_add_kobject(dev, i); 948 if (error) { 949 new_num = old_num; 950 break; 951 } 952 } 953 954 while (--i >= new_num) { 955 struct kobject *kobj = &dev->_rx[i].kobj; 956 957 if (!atomic_read(&dev_net(dev)->count)) 958 kobj->uevent_suppress = 1; 959 if (dev->sysfs_rx_queue_group) 960 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); 961 kobject_put(kobj); 962 } 963 964 return error; 965 #else 966 return 0; 967 #endif 968 } 969 970 #ifdef CONFIG_SYSFS 971 /* 972 * netdev_queue sysfs structures and functions. 973 */ 974 struct netdev_queue_attribute { 975 struct attribute attr; 976 ssize_t (*show)(struct netdev_queue *queue, char *buf); 977 ssize_t (*store)(struct netdev_queue *queue, 978 const char *buf, size_t len); 979 }; 980 #define to_netdev_queue_attr(_attr) \ 981 container_of(_attr, struct netdev_queue_attribute, attr) 982 983 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 984 985 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 986 struct attribute *attr, char *buf) 987 { 988 const struct netdev_queue_attribute *attribute 989 = to_netdev_queue_attr(attr); 990 struct netdev_queue *queue = to_netdev_queue(kobj); 991 992 if (!attribute->show) 993 return -EIO; 994 995 return attribute->show(queue, buf); 996 } 997 998 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 999 struct attribute *attr, 1000 const char *buf, size_t count) 1001 { 1002 const struct netdev_queue_attribute *attribute 1003 = to_netdev_queue_attr(attr); 1004 struct netdev_queue *queue = to_netdev_queue(kobj); 1005 1006 if (!attribute->store) 1007 return -EIO; 1008 1009 return attribute->store(queue, buf, count); 1010 } 1011 1012 static const struct sysfs_ops netdev_queue_sysfs_ops = { 1013 .show = netdev_queue_attr_show, 1014 .store = netdev_queue_attr_store, 1015 }; 1016 1017 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf) 1018 { 1019 unsigned long trans_timeout; 1020 1021 spin_lock_irq(&queue->_xmit_lock); 1022 trans_timeout = queue->trans_timeout; 1023 spin_unlock_irq(&queue->_xmit_lock); 1024 1025 return sprintf(buf, "%lu", trans_timeout); 1026 } 1027 1028 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1029 { 1030 struct net_device *dev = queue->dev; 1031 unsigned int i; 1032 1033 i = queue - dev->_tx; 1034 BUG_ON(i >= dev->num_tx_queues); 1035 1036 return i; 1037 } 1038 1039 static ssize_t traffic_class_show(struct netdev_queue *queue, 1040 char *buf) 1041 { 1042 struct net_device *dev = queue->dev; 1043 int index = get_netdev_queue_index(queue); 1044 int tc = netdev_txq_to_tc(dev, index); 1045 1046 if (tc < 0) 1047 return -EINVAL; 1048 1049 return sprintf(buf, "%u\n", tc); 1050 } 1051 1052 #ifdef CONFIG_XPS 1053 static ssize_t tx_maxrate_show(struct netdev_queue *queue, 1054 char *buf) 1055 { 1056 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1057 } 1058 1059 static ssize_t tx_maxrate_store(struct netdev_queue *queue, 1060 const char *buf, size_t len) 1061 { 1062 struct net_device *dev = queue->dev; 1063 int err, index = get_netdev_queue_index(queue); 1064 u32 rate = 0; 1065 1066 err = kstrtou32(buf, 10, &rate); 1067 if (err < 0) 1068 return err; 1069 1070 if (!rtnl_trylock()) 1071 return restart_syscall(); 1072 1073 err = -EOPNOTSUPP; 1074 if (dev->netdev_ops->ndo_set_tx_maxrate) 1075 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1076 1077 rtnl_unlock(); 1078 if (!err) { 1079 queue->tx_maxrate = rate; 1080 return len; 1081 } 1082 return err; 1083 } 1084 1085 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init 1086 = __ATTR_RW(tx_maxrate); 1087 #endif 1088 1089 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init 1090 = __ATTR_RO(tx_timeout); 1091 1092 static struct netdev_queue_attribute queue_traffic_class __ro_after_init 1093 = __ATTR_RO(traffic_class); 1094 1095 #ifdef CONFIG_BQL 1096 /* 1097 * Byte queue limits sysfs structures and functions. 1098 */ 1099 static ssize_t bql_show(char *buf, unsigned int value) 1100 { 1101 return sprintf(buf, "%u\n", value); 1102 } 1103 1104 static ssize_t bql_set(const char *buf, const size_t count, 1105 unsigned int *pvalue) 1106 { 1107 unsigned int value; 1108 int err; 1109 1110 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) { 1111 value = DQL_MAX_LIMIT; 1112 } else { 1113 err = kstrtouint(buf, 10, &value); 1114 if (err < 0) 1115 return err; 1116 if (value > DQL_MAX_LIMIT) 1117 return -EINVAL; 1118 } 1119 1120 *pvalue = value; 1121 1122 return count; 1123 } 1124 1125 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1126 char *buf) 1127 { 1128 struct dql *dql = &queue->dql; 1129 1130 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1131 } 1132 1133 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1134 const char *buf, size_t len) 1135 { 1136 struct dql *dql = &queue->dql; 1137 unsigned int value; 1138 int err; 1139 1140 err = kstrtouint(buf, 10, &value); 1141 if (err < 0) 1142 return err; 1143 1144 dql->slack_hold_time = msecs_to_jiffies(value); 1145 1146 return len; 1147 } 1148 1149 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init 1150 = __ATTR(hold_time, S_IRUGO | S_IWUSR, 1151 bql_show_hold_time, bql_set_hold_time); 1152 1153 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1154 char *buf) 1155 { 1156 struct dql *dql = &queue->dql; 1157 1158 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1159 } 1160 1161 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init = 1162 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1163 1164 #define BQL_ATTR(NAME, FIELD) \ 1165 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1166 char *buf) \ 1167 { \ 1168 return bql_show(buf, queue->dql.FIELD); \ 1169 } \ 1170 \ 1171 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1172 const char *buf, size_t len) \ 1173 { \ 1174 return bql_set(buf, len, &queue->dql.FIELD); \ 1175 } \ 1176 \ 1177 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \ 1178 = __ATTR(NAME, S_IRUGO | S_IWUSR, \ 1179 bql_show_ ## NAME, bql_set_ ## NAME) 1180 1181 BQL_ATTR(limit, limit); 1182 BQL_ATTR(limit_max, max_limit); 1183 BQL_ATTR(limit_min, min_limit); 1184 1185 static struct attribute *dql_attrs[] __ro_after_init = { 1186 &bql_limit_attribute.attr, 1187 &bql_limit_max_attribute.attr, 1188 &bql_limit_min_attribute.attr, 1189 &bql_hold_time_attribute.attr, 1190 &bql_inflight_attribute.attr, 1191 NULL 1192 }; 1193 1194 static const struct attribute_group dql_group = { 1195 .name = "byte_queue_limits", 1196 .attrs = dql_attrs, 1197 }; 1198 #endif /* CONFIG_BQL */ 1199 1200 #ifdef CONFIG_XPS 1201 static ssize_t xps_cpus_show(struct netdev_queue *queue, 1202 char *buf) 1203 { 1204 struct net_device *dev = queue->dev; 1205 int cpu, len, num_tc = 1, tc = 0; 1206 struct xps_dev_maps *dev_maps; 1207 cpumask_var_t mask; 1208 unsigned long index; 1209 1210 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1211 return -ENOMEM; 1212 1213 index = get_netdev_queue_index(queue); 1214 1215 if (dev->num_tc) { 1216 num_tc = dev->num_tc; 1217 tc = netdev_txq_to_tc(dev, index); 1218 if (tc < 0) 1219 return -EINVAL; 1220 } 1221 1222 rcu_read_lock(); 1223 dev_maps = rcu_dereference(dev->xps_maps); 1224 if (dev_maps) { 1225 for_each_possible_cpu(cpu) { 1226 int i, tci = cpu * num_tc + tc; 1227 struct xps_map *map; 1228 1229 map = rcu_dereference(dev_maps->cpu_map[tci]); 1230 if (!map) 1231 continue; 1232 1233 for (i = map->len; i--;) { 1234 if (map->queues[i] == index) { 1235 cpumask_set_cpu(cpu, mask); 1236 break; 1237 } 1238 } 1239 } 1240 } 1241 rcu_read_unlock(); 1242 1243 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1244 free_cpumask_var(mask); 1245 return len < PAGE_SIZE ? len : -EINVAL; 1246 } 1247 1248 static ssize_t xps_cpus_store(struct netdev_queue *queue, 1249 const char *buf, size_t len) 1250 { 1251 struct net_device *dev = queue->dev; 1252 unsigned long index; 1253 cpumask_var_t mask; 1254 int err; 1255 1256 if (!capable(CAP_NET_ADMIN)) 1257 return -EPERM; 1258 1259 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1260 return -ENOMEM; 1261 1262 index = get_netdev_queue_index(queue); 1263 1264 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1265 if (err) { 1266 free_cpumask_var(mask); 1267 return err; 1268 } 1269 1270 err = netif_set_xps_queue(dev, mask, index); 1271 1272 free_cpumask_var(mask); 1273 1274 return err ? : len; 1275 } 1276 1277 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init 1278 = __ATTR_RW(xps_cpus); 1279 #endif /* CONFIG_XPS */ 1280 1281 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = { 1282 &queue_trans_timeout.attr, 1283 &queue_traffic_class.attr, 1284 #ifdef CONFIG_XPS 1285 &xps_cpus_attribute.attr, 1286 &queue_tx_maxrate.attr, 1287 #endif 1288 NULL 1289 }; 1290 1291 static void netdev_queue_release(struct kobject *kobj) 1292 { 1293 struct netdev_queue *queue = to_netdev_queue(kobj); 1294 1295 memset(kobj, 0, sizeof(*kobj)); 1296 dev_put(queue->dev); 1297 } 1298 1299 static const void *netdev_queue_namespace(struct kobject *kobj) 1300 { 1301 struct netdev_queue *queue = to_netdev_queue(kobj); 1302 struct device *dev = &queue->dev->dev; 1303 const void *ns = NULL; 1304 1305 if (dev->class && dev->class->ns_type) 1306 ns = dev->class->namespace(dev); 1307 1308 return ns; 1309 } 1310 1311 static struct kobj_type netdev_queue_ktype __ro_after_init = { 1312 .sysfs_ops = &netdev_queue_sysfs_ops, 1313 .release = netdev_queue_release, 1314 .default_attrs = netdev_queue_default_attrs, 1315 .namespace = netdev_queue_namespace, 1316 }; 1317 1318 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1319 { 1320 struct netdev_queue *queue = dev->_tx + index; 1321 struct kobject *kobj = &queue->kobj; 1322 int error = 0; 1323 1324 kobj->kset = dev->queues_kset; 1325 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1326 "tx-%u", index); 1327 if (error) 1328 return error; 1329 1330 #ifdef CONFIG_BQL 1331 error = sysfs_create_group(kobj, &dql_group); 1332 if (error) { 1333 kobject_put(kobj); 1334 return error; 1335 } 1336 #endif 1337 1338 kobject_uevent(kobj, KOBJ_ADD); 1339 dev_hold(queue->dev); 1340 1341 return 0; 1342 } 1343 #endif /* CONFIG_SYSFS */ 1344 1345 int 1346 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1347 { 1348 #ifdef CONFIG_SYSFS 1349 int i; 1350 int error = 0; 1351 1352 for (i = old_num; i < new_num; i++) { 1353 error = netdev_queue_add_kobject(dev, i); 1354 if (error) { 1355 new_num = old_num; 1356 break; 1357 } 1358 } 1359 1360 while (--i >= new_num) { 1361 struct netdev_queue *queue = dev->_tx + i; 1362 1363 if (!atomic_read(&dev_net(dev)->count)) 1364 queue->kobj.uevent_suppress = 1; 1365 #ifdef CONFIG_BQL 1366 sysfs_remove_group(&queue->kobj, &dql_group); 1367 #endif 1368 kobject_put(&queue->kobj); 1369 } 1370 1371 return error; 1372 #else 1373 return 0; 1374 #endif /* CONFIG_SYSFS */ 1375 } 1376 1377 static int register_queue_kobjects(struct net_device *dev) 1378 { 1379 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1380 1381 #ifdef CONFIG_SYSFS 1382 dev->queues_kset = kset_create_and_add("queues", 1383 NULL, &dev->dev.kobj); 1384 if (!dev->queues_kset) 1385 return -ENOMEM; 1386 real_rx = dev->real_num_rx_queues; 1387 #endif 1388 real_tx = dev->real_num_tx_queues; 1389 1390 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1391 if (error) 1392 goto error; 1393 rxq = real_rx; 1394 1395 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1396 if (error) 1397 goto error; 1398 txq = real_tx; 1399 1400 return 0; 1401 1402 error: 1403 netdev_queue_update_kobjects(dev, txq, 0); 1404 net_rx_queue_update_kobjects(dev, rxq, 0); 1405 return error; 1406 } 1407 1408 static void remove_queue_kobjects(struct net_device *dev) 1409 { 1410 int real_rx = 0, real_tx = 0; 1411 1412 #ifdef CONFIG_SYSFS 1413 real_rx = dev->real_num_rx_queues; 1414 #endif 1415 real_tx = dev->real_num_tx_queues; 1416 1417 net_rx_queue_update_kobjects(dev, real_rx, 0); 1418 netdev_queue_update_kobjects(dev, real_tx, 0); 1419 #ifdef CONFIG_SYSFS 1420 kset_unregister(dev->queues_kset); 1421 #endif 1422 } 1423 1424 static bool net_current_may_mount(void) 1425 { 1426 struct net *net = current->nsproxy->net_ns; 1427 1428 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1429 } 1430 1431 static void *net_grab_current_ns(void) 1432 { 1433 struct net *ns = current->nsproxy->net_ns; 1434 #ifdef CONFIG_NET_NS 1435 if (ns) 1436 refcount_inc(&ns->passive); 1437 #endif 1438 return ns; 1439 } 1440 1441 static const void *net_initial_ns(void) 1442 { 1443 return &init_net; 1444 } 1445 1446 static const void *net_netlink_ns(struct sock *sk) 1447 { 1448 return sock_net(sk); 1449 } 1450 1451 const struct kobj_ns_type_operations net_ns_type_operations = { 1452 .type = KOBJ_NS_TYPE_NET, 1453 .current_may_mount = net_current_may_mount, 1454 .grab_current_ns = net_grab_current_ns, 1455 .netlink_ns = net_netlink_ns, 1456 .initial_ns = net_initial_ns, 1457 .drop_ns = net_drop_ns, 1458 }; 1459 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1460 1461 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1462 { 1463 struct net_device *dev = to_net_dev(d); 1464 int retval; 1465 1466 /* pass interface to uevent. */ 1467 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1468 if (retval) 1469 goto exit; 1470 1471 /* pass ifindex to uevent. 1472 * ifindex is useful as it won't change (interface name may change) 1473 * and is what RtNetlink uses natively. 1474 */ 1475 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1476 1477 exit: 1478 return retval; 1479 } 1480 1481 /* 1482 * netdev_release -- destroy and free a dead device. 1483 * Called when last reference to device kobject is gone. 1484 */ 1485 static void netdev_release(struct device *d) 1486 { 1487 struct net_device *dev = to_net_dev(d); 1488 1489 BUG_ON(dev->reg_state != NETREG_RELEASED); 1490 1491 kfree(dev->ifalias); 1492 netdev_freemem(dev); 1493 } 1494 1495 static const void *net_namespace(struct device *d) 1496 { 1497 struct net_device *dev = to_net_dev(d); 1498 1499 return dev_net(dev); 1500 } 1501 1502 static struct class net_class __ro_after_init = { 1503 .name = "net", 1504 .dev_release = netdev_release, 1505 .dev_groups = net_class_groups, 1506 .dev_uevent = netdev_uevent, 1507 .ns_type = &net_ns_type_operations, 1508 .namespace = net_namespace, 1509 }; 1510 1511 #ifdef CONFIG_OF_NET 1512 static int of_dev_node_match(struct device *dev, const void *data) 1513 { 1514 int ret = 0; 1515 1516 if (dev->parent) 1517 ret = dev->parent->of_node == data; 1518 1519 return ret == 0 ? dev->of_node == data : ret; 1520 } 1521 1522 /* 1523 * of_find_net_device_by_node - lookup the net device for the device node 1524 * @np: OF device node 1525 * 1526 * Looks up the net_device structure corresponding with the device node. 1527 * If successful, returns a pointer to the net_device with the embedded 1528 * struct device refcount incremented by one, or NULL on failure. The 1529 * refcount must be dropped when done with the net_device. 1530 */ 1531 struct net_device *of_find_net_device_by_node(struct device_node *np) 1532 { 1533 struct device *dev; 1534 1535 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1536 if (!dev) 1537 return NULL; 1538 1539 return to_net_dev(dev); 1540 } 1541 EXPORT_SYMBOL(of_find_net_device_by_node); 1542 #endif 1543 1544 /* Delete sysfs entries but hold kobject reference until after all 1545 * netdev references are gone. 1546 */ 1547 void netdev_unregister_kobject(struct net_device *ndev) 1548 { 1549 struct device *dev = &ndev->dev; 1550 1551 if (!atomic_read(&dev_net(ndev)->count)) 1552 dev_set_uevent_suppress(dev, 1); 1553 1554 kobject_get(&dev->kobj); 1555 1556 remove_queue_kobjects(ndev); 1557 1558 pm_runtime_set_memalloc_noio(dev, false); 1559 1560 device_del(dev); 1561 } 1562 1563 /* Create sysfs entries for network device. */ 1564 int netdev_register_kobject(struct net_device *ndev) 1565 { 1566 struct device *dev = &ndev->dev; 1567 const struct attribute_group **groups = ndev->sysfs_groups; 1568 int error = 0; 1569 1570 device_initialize(dev); 1571 dev->class = &net_class; 1572 dev->platform_data = ndev; 1573 dev->groups = groups; 1574 1575 dev_set_name(dev, "%s", ndev->name); 1576 1577 #ifdef CONFIG_SYSFS 1578 /* Allow for a device specific group */ 1579 if (*groups) 1580 groups++; 1581 1582 *groups++ = &netstat_group; 1583 1584 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1585 if (ndev->ieee80211_ptr) 1586 *groups++ = &wireless_group; 1587 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1588 else if (ndev->wireless_handlers) 1589 *groups++ = &wireless_group; 1590 #endif 1591 #endif 1592 #endif /* CONFIG_SYSFS */ 1593 1594 error = device_add(dev); 1595 if (error) 1596 return error; 1597 1598 error = register_queue_kobjects(ndev); 1599 if (error) { 1600 device_del(dev); 1601 return error; 1602 } 1603 1604 pm_runtime_set_memalloc_noio(dev, true); 1605 1606 return error; 1607 } 1608 1609 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 1610 const void *ns) 1611 { 1612 return class_create_file_ns(&net_class, class_attr, ns); 1613 } 1614 EXPORT_SYMBOL(netdev_class_create_file_ns); 1615 1616 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 1617 const void *ns) 1618 { 1619 class_remove_file_ns(&net_class, class_attr, ns); 1620 } 1621 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1622 1623 int __init netdev_kobject_init(void) 1624 { 1625 kobj_ns_type_register(&net_ns_type_operations); 1626 return class_register(&net_class); 1627 } 1628