1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kmod.h> 3 #include <linux/netdevice.h> 4 #include <linux/inetdevice.h> 5 #include <linux/etherdevice.h> 6 #include <linux/rtnetlink.h> 7 #include <linux/net_tstamp.h> 8 #include <linux/phylib_stubs.h> 9 #include <linux/ptp_clock_kernel.h> 10 #include <linux/wireless.h> 11 #include <linux/if_bridge.h> 12 #include <net/dsa_stubs.h> 13 #include <net/netdev_lock.h> 14 #include <net/wext.h> 15 16 #include "dev.h" 17 18 /* 19 * Map an interface index to its name (SIOCGIFNAME) 20 */ 21 22 /* 23 * We need this ioctl for efficient implementation of the 24 * if_indextoname() function required by the IPv6 API. Without 25 * it, we would have to search all the interfaces to find a 26 * match. --pb 27 */ 28 29 static int dev_ifname(struct net *net, struct ifreq *ifr) 30 { 31 ifr->ifr_name[IFNAMSIZ-1] = 0; 32 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); 33 } 34 35 /* 36 * Perform a SIOCGIFCONF call. This structure will change 37 * size eventually, and there is nothing I can do about it. 38 * Thus we will need a 'compatibility mode'. 39 */ 40 int dev_ifconf(struct net *net, struct ifconf __user *uifc) 41 { 42 struct net_device *dev; 43 void __user *pos; 44 size_t size; 45 int len, total = 0, done; 46 47 /* both the ifconf and the ifreq structures are slightly different */ 48 if (in_compat_syscall()) { 49 struct compat_ifconf ifc32; 50 51 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf))) 52 return -EFAULT; 53 54 pos = compat_ptr(ifc32.ifcbuf); 55 len = ifc32.ifc_len; 56 size = sizeof(struct compat_ifreq); 57 } else { 58 struct ifconf ifc; 59 60 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 61 return -EFAULT; 62 63 pos = ifc.ifc_buf; 64 len = ifc.ifc_len; 65 size = sizeof(struct ifreq); 66 } 67 68 /* Loop over the interfaces, and write an info block for each. */ 69 rtnl_net_lock(net); 70 for_each_netdev(net, dev) { 71 if (!pos) 72 done = inet_gifconf(dev, NULL, 0, size); 73 else 74 done = inet_gifconf(dev, pos + total, 75 len - total, size); 76 if (done < 0) { 77 rtnl_net_unlock(net); 78 return -EFAULT; 79 } 80 total += done; 81 } 82 rtnl_net_unlock(net); 83 84 return put_user(total, &uifc->ifc_len); 85 } 86 87 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr) 88 { 89 struct ifmap *ifmap = &ifr->ifr_map; 90 91 if (in_compat_syscall()) { 92 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap; 93 94 cifmap->mem_start = dev->mem_start; 95 cifmap->mem_end = dev->mem_end; 96 cifmap->base_addr = dev->base_addr; 97 cifmap->irq = dev->irq; 98 cifmap->dma = dev->dma; 99 cifmap->port = dev->if_port; 100 101 return 0; 102 } 103 104 ifmap->mem_start = dev->mem_start; 105 ifmap->mem_end = dev->mem_end; 106 ifmap->base_addr = dev->base_addr; 107 ifmap->irq = dev->irq; 108 ifmap->dma = dev->dma; 109 ifmap->port = dev->if_port; 110 111 return 0; 112 } 113 114 static int netif_setifmap(struct net_device *dev, struct ifreq *ifr) 115 { 116 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map; 117 118 if (!dev->netdev_ops->ndo_set_config) 119 return -EOPNOTSUPP; 120 121 if (in_compat_syscall()) { 122 struct ifmap ifmap = { 123 .mem_start = cifmap->mem_start, 124 .mem_end = cifmap->mem_end, 125 .base_addr = cifmap->base_addr, 126 .irq = cifmap->irq, 127 .dma = cifmap->dma, 128 .port = cifmap->port, 129 }; 130 131 return dev->netdev_ops->ndo_set_config(dev, &ifmap); 132 } 133 134 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map); 135 } 136 137 /* 138 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 139 */ 140 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 141 { 142 int err; 143 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 144 145 if (!dev) 146 return -ENODEV; 147 148 switch (cmd) { 149 case SIOCGIFFLAGS: /* Get interface flags */ 150 ifr->ifr_flags = (short)netif_get_flags(dev); 151 return 0; 152 153 case SIOCGIFMETRIC: /* Get the metric on the interface 154 (currently unused) */ 155 ifr->ifr_metric = 0; 156 return 0; 157 158 case SIOCGIFMTU: /* Get the MTU of a device */ 159 ifr->ifr_mtu = dev->mtu; 160 return 0; 161 162 case SIOCGIFSLAVE: 163 err = -EINVAL; 164 break; 165 166 case SIOCGIFMAP: 167 return dev_getifmap(dev, ifr); 168 169 case SIOCGIFINDEX: 170 ifr->ifr_ifindex = dev->ifindex; 171 return 0; 172 173 case SIOCGIFTXQLEN: 174 ifr->ifr_qlen = dev->tx_queue_len; 175 return 0; 176 177 default: 178 /* dev_ioctl() should ensure this case 179 * is never reached 180 */ 181 WARN_ON(1); 182 err = -ENOTTY; 183 break; 184 185 } 186 return err; 187 } 188 189 int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg) 190 { 191 enum hwtstamp_tx_types tx_type; 192 enum hwtstamp_rx_filters rx_filter; 193 int tx_type_valid = 0; 194 int rx_filter_valid = 0; 195 196 if (cfg->flags & ~HWTSTAMP_FLAG_MASK) 197 return -EINVAL; 198 199 tx_type = cfg->tx_type; 200 rx_filter = cfg->rx_filter; 201 202 switch (tx_type) { 203 case HWTSTAMP_TX_OFF: 204 case HWTSTAMP_TX_ON: 205 case HWTSTAMP_TX_ONESTEP_SYNC: 206 case HWTSTAMP_TX_ONESTEP_P2P: 207 tx_type_valid = 1; 208 break; 209 case __HWTSTAMP_TX_CNT: 210 /* not a real value */ 211 break; 212 } 213 214 switch (rx_filter) { 215 case HWTSTAMP_FILTER_NONE: 216 case HWTSTAMP_FILTER_ALL: 217 case HWTSTAMP_FILTER_SOME: 218 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 219 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 220 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 221 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 222 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 223 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 224 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 225 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 226 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 227 case HWTSTAMP_FILTER_PTP_V2_EVENT: 228 case HWTSTAMP_FILTER_PTP_V2_SYNC: 229 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 230 case HWTSTAMP_FILTER_NTP_ALL: 231 rx_filter_valid = 1; 232 break; 233 case __HWTSTAMP_FILTER_CNT: 234 /* not a real value */ 235 break; 236 } 237 238 if (!tx_type_valid || !rx_filter_valid) 239 return -ERANGE; 240 241 return 0; 242 } 243 244 /** 245 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC 246 * or of attached phylib PHY 247 * @dev: Network device 248 * @cfg: Timestamping configuration structure 249 * 250 * Helper for calling the default hardware provider timestamping. 251 * 252 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), but 253 * phydev->mii_ts has both hwtstamp_get() and hwtstamp_set() methods. So this 254 * will return -EOPNOTSUPP for phylib only if hwtstamp_get() is not 255 * implemented for now, which is still more accurate than letting the netdev 256 * handle the GET request. 257 */ 258 int dev_get_hwtstamp_phylib(struct net_device *dev, 259 struct kernel_hwtstamp_config *cfg) 260 { 261 struct hwtstamp_provider *hwprov; 262 263 hwprov = rtnl_dereference(dev->hwprov); 264 if (hwprov) { 265 cfg->qualifier = hwprov->desc.qualifier; 266 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB && 267 hwprov->phydev) 268 return phy_hwtstamp_get(hwprov->phydev, cfg); 269 270 if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) 271 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg); 272 273 return -EOPNOTSUPP; 274 } 275 276 if (phy_is_default_hwtstamp(dev->phydev)) 277 return phy_hwtstamp_get(dev->phydev, cfg); 278 279 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg); 280 } 281 282 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr) 283 { 284 const struct net_device_ops *ops = dev->netdev_ops; 285 struct kernel_hwtstamp_config kernel_cfg = {}; 286 struct hwtstamp_config cfg; 287 int err; 288 289 if (!ops->ndo_hwtstamp_get) 290 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */ 291 292 if (!netif_device_present(dev)) 293 return -ENODEV; 294 295 kernel_cfg.ifr = ifr; 296 netdev_lock_ops(dev); 297 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg); 298 netdev_unlock_ops(dev); 299 if (err) 300 return err; 301 302 /* If the request was resolved through an unconverted driver, omit 303 * the copy_to_user(), since the implementation has already done that 304 */ 305 if (!kernel_cfg.copied_to_user) { 306 hwtstamp_config_from_kernel(&cfg, &kernel_cfg); 307 308 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 309 return -EFAULT; 310 } 311 312 return 0; 313 } 314 315 /** 316 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC 317 * or of attached phylib PHY 318 * @dev: Network device 319 * @cfg: Timestamping configuration structure 320 * @extack: Netlink extended ack message structure, for error reporting 321 * 322 * Helper for enforcing a common policy that phylib timestamping, if available, 323 * should take precedence in front of hardware timestamping provided by the 324 * netdev. If the netdev driver needs to perform specific actions even for PHY 325 * timestamping to work properly (a switch port must trap the timestamped 326 * frames and not forward them), it must set dev->see_all_hwtstamp_requests. 327 */ 328 int dev_set_hwtstamp_phylib(struct net_device *dev, 329 struct kernel_hwtstamp_config *cfg, 330 struct netlink_ext_ack *extack) 331 { 332 const struct net_device_ops *ops = dev->netdev_ops; 333 struct kernel_hwtstamp_config old_cfg = {}; 334 struct hwtstamp_provider *hwprov; 335 struct phy_device *phydev; 336 bool changed = false; 337 bool phy_ts; 338 int err; 339 340 hwprov = rtnl_dereference(dev->hwprov); 341 if (hwprov) { 342 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB && 343 hwprov->phydev) { 344 phy_ts = true; 345 phydev = hwprov->phydev; 346 } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) { 347 phy_ts = false; 348 } else { 349 return -EOPNOTSUPP; 350 } 351 352 cfg->qualifier = hwprov->desc.qualifier; 353 } else { 354 phy_ts = phy_is_default_hwtstamp(dev->phydev); 355 if (phy_ts) 356 phydev = dev->phydev; 357 } 358 359 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV; 360 361 if (phy_ts && dev->see_all_hwtstamp_requests) { 362 err = ops->ndo_hwtstamp_get(dev, &old_cfg); 363 if (err) 364 return err; 365 } 366 367 if (!phy_ts || dev->see_all_hwtstamp_requests) { 368 err = ops->ndo_hwtstamp_set(dev, cfg, extack); 369 if (err) { 370 if (extack->_msg) 371 netdev_err(dev, "%s\n", extack->_msg); 372 return err; 373 } 374 } 375 376 if (phy_ts && dev->see_all_hwtstamp_requests) 377 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg); 378 379 if (phy_ts) { 380 err = phy_hwtstamp_set(phydev, cfg, extack); 381 if (err) { 382 if (changed) 383 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL); 384 return err; 385 } 386 } 387 388 return 0; 389 } 390 391 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr) 392 { 393 const struct net_device_ops *ops = dev->netdev_ops; 394 struct kernel_hwtstamp_config kernel_cfg = {}; 395 struct netlink_ext_ack extack = {}; 396 struct hwtstamp_config cfg; 397 int err; 398 399 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 400 return -EFAULT; 401 402 hwtstamp_config_to_kernel(&kernel_cfg, &cfg); 403 kernel_cfg.ifr = ifr; 404 405 err = net_hwtstamp_validate(&kernel_cfg); 406 if (err) 407 return err; 408 409 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack); 410 if (err) { 411 if (extack._msg) 412 netdev_err(dev, "%s\n", extack._msg); 413 return err; 414 } 415 416 if (!ops->ndo_hwtstamp_set) 417 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */ 418 419 if (!netif_device_present(dev)) 420 return -ENODEV; 421 422 netdev_lock_ops(dev); 423 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack); 424 netdev_unlock_ops(dev); 425 if (err) 426 return err; 427 428 /* The driver may have modified the configuration, so copy the 429 * updated version of it back to user space 430 */ 431 if (!kernel_cfg.copied_to_user) { 432 hwtstamp_config_from_kernel(&cfg, &kernel_cfg); 433 434 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 435 return -EFAULT; 436 } 437 438 return 0; 439 } 440 441 static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd, 442 struct kernel_hwtstamp_config *kernel_cfg) 443 { 444 struct ifreq ifrr; 445 int err; 446 447 if (!kernel_cfg->ifr) 448 return -EINVAL; 449 450 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ); 451 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru; 452 453 err = dev_eth_ioctl(dev, &ifrr, cmd); 454 if (err) 455 return err; 456 457 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru; 458 kernel_cfg->copied_to_user = true; 459 460 return 0; 461 } 462 463 int generic_hwtstamp_get_lower(struct net_device *dev, 464 struct kernel_hwtstamp_config *kernel_cfg) 465 { 466 const struct net_device_ops *ops = dev->netdev_ops; 467 468 if (!netif_device_present(dev)) 469 return -ENODEV; 470 471 if (ops->ndo_hwtstamp_get) { 472 int err; 473 474 netdev_lock_ops(dev); 475 err = dev_get_hwtstamp_phylib(dev, kernel_cfg); 476 netdev_unlock_ops(dev); 477 478 return err; 479 } 480 481 /* Legacy path: unconverted lower driver */ 482 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg); 483 } 484 EXPORT_SYMBOL(generic_hwtstamp_get_lower); 485 486 int generic_hwtstamp_set_lower(struct net_device *dev, 487 struct kernel_hwtstamp_config *kernel_cfg, 488 struct netlink_ext_ack *extack) 489 { 490 const struct net_device_ops *ops = dev->netdev_ops; 491 492 if (!netif_device_present(dev)) 493 return -ENODEV; 494 495 if (ops->ndo_hwtstamp_set) { 496 int err; 497 498 netdev_lock_ops(dev); 499 err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack); 500 netdev_unlock_ops(dev); 501 502 return err; 503 } 504 505 /* Legacy path: unconverted lower driver */ 506 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg); 507 } 508 EXPORT_SYMBOL(generic_hwtstamp_set_lower); 509 510 static int dev_siocbond(struct net_device *dev, 511 struct ifreq *ifr, unsigned int cmd) 512 { 513 const struct net_device_ops *ops = dev->netdev_ops; 514 515 if (ops->ndo_siocbond) { 516 int ret = -ENODEV; 517 518 netdev_lock_ops(dev); 519 if (netif_device_present(dev)) 520 ret = ops->ndo_siocbond(dev, ifr, cmd); 521 netdev_unlock_ops(dev); 522 523 return ret; 524 } 525 526 return -EOPNOTSUPP; 527 } 528 529 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 530 void __user *data, unsigned int cmd) 531 { 532 const struct net_device_ops *ops = dev->netdev_ops; 533 534 if (ops->ndo_siocdevprivate) { 535 int ret = -ENODEV; 536 537 netdev_lock_ops(dev); 538 if (netif_device_present(dev)) 539 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd); 540 netdev_unlock_ops(dev); 541 542 return ret; 543 } 544 545 return -EOPNOTSUPP; 546 } 547 548 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 549 { 550 const struct net_device_ops *ops = dev->netdev_ops; 551 552 if (ops->ndo_siocwandev) { 553 int ret = -ENODEV; 554 555 netdev_lock_ops(dev); 556 if (netif_device_present(dev)) 557 ret = ops->ndo_siocwandev(dev, ifs); 558 netdev_unlock_ops(dev); 559 560 return ret; 561 } 562 563 return -EOPNOTSUPP; 564 } 565 566 /* 567 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock() 568 */ 569 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 570 unsigned int cmd) 571 { 572 int err; 573 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 574 const struct net_device_ops *ops; 575 576 if (!dev) 577 return -ENODEV; 578 579 ops = dev->netdev_ops; 580 581 switch (cmd) { 582 case SIOCSIFFLAGS: /* Set interface flags */ 583 return dev_change_flags(dev, ifr->ifr_flags, NULL); 584 585 case SIOCSIFMETRIC: /* Set the metric on the interface 586 (currently unused) */ 587 return -EOPNOTSUPP; 588 589 case SIOCSIFMTU: /* Set the MTU of a device */ 590 return dev_set_mtu(dev, ifr->ifr_mtu); 591 592 case SIOCSIFHWADDR: 593 if (dev->addr_len > sizeof(ifr->ifr_hwaddr)) 594 return -EINVAL; 595 return dev_set_mac_address_user(dev, 596 (struct sockaddr_storage *)&ifr->ifr_hwaddr, 597 NULL); 598 599 case SIOCSIFHWBROADCAST: 600 if (ifr->ifr_hwaddr.sa_family != dev->type) 601 return -EINVAL; 602 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 603 min(sizeof(ifr->ifr_hwaddr.sa_data), 604 (size_t)dev->addr_len)); 605 netdev_lock_ops(dev); 606 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 607 netdev_unlock_ops(dev); 608 return 0; 609 610 case SIOCSIFMAP: 611 netdev_lock_ops(dev); 612 err = netif_setifmap(dev, ifr); 613 netdev_unlock_ops(dev); 614 return err; 615 616 case SIOCADDMULTI: 617 if (!ops->ndo_set_rx_mode || 618 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 619 return -EINVAL; 620 if (!netif_device_present(dev)) 621 return -ENODEV; 622 netdev_lock_ops(dev); 623 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 624 netdev_unlock_ops(dev); 625 return err; 626 627 case SIOCDELMULTI: 628 if (!ops->ndo_set_rx_mode || 629 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 630 return -EINVAL; 631 if (!netif_device_present(dev)) 632 return -ENODEV; 633 netdev_lock_ops(dev); 634 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 635 netdev_unlock_ops(dev); 636 return err; 637 638 case SIOCSIFTXQLEN: 639 if (ifr->ifr_qlen < 0) 640 return -EINVAL; 641 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 642 643 case SIOCSIFNAME: 644 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 645 return dev_change_name(dev, ifr->ifr_newname); 646 647 case SIOCWANDEV: 648 return dev_siocwandev(dev, &ifr->ifr_settings); 649 650 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15: 651 return dev_siocdevprivate(dev, ifr, data, cmd); 652 653 case SIOCSHWTSTAMP: 654 return dev_set_hwtstamp(dev, ifr); 655 656 case SIOCGHWTSTAMP: 657 return dev_get_hwtstamp(dev, ifr); 658 659 case SIOCGMIIPHY: 660 case SIOCGMIIREG: 661 case SIOCSMIIREG: 662 return dev_eth_ioctl(dev, ifr, cmd); 663 664 case SIOCBONDENSLAVE: 665 case SIOCBONDRELEASE: 666 case SIOCBONDSETHWADDR: 667 case SIOCBONDSLAVEINFOQUERY: 668 case SIOCBONDINFOQUERY: 669 case SIOCBONDCHANGEACTIVE: 670 return dev_siocbond(dev, ifr, cmd); 671 672 /* Unknown ioctl */ 673 default: 674 err = -EINVAL; 675 } 676 return err; 677 } 678 679 /** 680 * dev_load - load a network module 681 * @net: the applicable net namespace 682 * @name: name of interface 683 * 684 * If a network interface is not present and the process has suitable 685 * privileges this function loads the module. If module loading is not 686 * available in this kernel then it becomes a nop. 687 */ 688 689 void dev_load(struct net *net, const char *name) 690 { 691 struct net_device *dev; 692 int no_module; 693 694 rcu_read_lock(); 695 dev = dev_get_by_name_rcu(net, name); 696 rcu_read_unlock(); 697 698 no_module = !dev; 699 if (no_module && capable(CAP_NET_ADMIN)) 700 no_module = request_module("netdev-%s", name); 701 if (no_module && capable(CAP_SYS_MODULE)) 702 request_module("%s", name); 703 } 704 EXPORT_SYMBOL(dev_load); 705 706 /* 707 * This function handles all "interface"-type I/O control requests. The actual 708 * 'doing' part of this is dev_ifsioc above. 709 */ 710 711 /** 712 * dev_ioctl - network device ioctl 713 * @net: the applicable net namespace 714 * @cmd: command to issue 715 * @ifr: pointer to a struct ifreq in user space 716 * @data: data exchanged with userspace 717 * @need_copyout: whether or not copy_to_user() should be called 718 * 719 * Issue ioctl functions to devices. This is normally called by the 720 * user space syscall interfaces but can sometimes be useful for 721 * other purposes. The return value is the return from the syscall if 722 * positive or a negative errno code on error. 723 */ 724 725 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 726 void __user *data, bool *need_copyout) 727 { 728 int ret; 729 char *colon; 730 731 if (need_copyout) 732 *need_copyout = true; 733 if (cmd == SIOCGIFNAME) 734 return dev_ifname(net, ifr); 735 736 ifr->ifr_name[IFNAMSIZ-1] = 0; 737 738 colon = strchr(ifr->ifr_name, ':'); 739 if (colon) 740 *colon = 0; 741 742 /* 743 * See which interface the caller is talking about. 744 */ 745 746 switch (cmd) { 747 case SIOCGIFHWADDR: 748 dev_load(net, ifr->ifr_name); 749 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net, 750 ifr->ifr_name); 751 if (colon) 752 *colon = ':'; 753 return ret; 754 /* 755 * These ioctl calls: 756 * - can be done by all. 757 * - atomic and do not require locking. 758 * - return a value 759 */ 760 case SIOCGIFFLAGS: 761 case SIOCGIFMETRIC: 762 case SIOCGIFMTU: 763 case SIOCGIFSLAVE: 764 case SIOCGIFMAP: 765 case SIOCGIFINDEX: 766 case SIOCGIFTXQLEN: 767 dev_load(net, ifr->ifr_name); 768 rcu_read_lock(); 769 ret = dev_ifsioc_locked(net, ifr, cmd); 770 rcu_read_unlock(); 771 if (colon) 772 *colon = ':'; 773 return ret; 774 775 case SIOCETHTOOL: 776 dev_load(net, ifr->ifr_name); 777 ret = dev_ethtool(net, ifr, data); 778 if (colon) 779 *colon = ':'; 780 return ret; 781 782 /* 783 * These ioctl calls: 784 * - require superuser power. 785 * - require strict serialization. 786 * - return a value 787 */ 788 case SIOCGMIIPHY: 789 case SIOCGMIIREG: 790 case SIOCSIFNAME: 791 dev_load(net, ifr->ifr_name); 792 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 793 return -EPERM; 794 795 rtnl_net_lock(net); 796 ret = dev_ifsioc(net, ifr, data, cmd); 797 rtnl_net_unlock(net); 798 799 if (colon) 800 *colon = ':'; 801 return ret; 802 803 /* 804 * These ioctl calls: 805 * - require superuser power. 806 * - require strict serialization. 807 * - do not return a value 808 */ 809 case SIOCSIFMAP: 810 case SIOCSIFTXQLEN: 811 if (!capable(CAP_NET_ADMIN)) 812 return -EPERM; 813 fallthrough; 814 /* 815 * These ioctl calls: 816 * - require local superuser power. 817 * - require strict serialization. 818 * - do not return a value 819 */ 820 case SIOCSIFFLAGS: 821 case SIOCSIFMETRIC: 822 case SIOCSIFMTU: 823 case SIOCSIFHWADDR: 824 case SIOCSIFSLAVE: 825 case SIOCADDMULTI: 826 case SIOCDELMULTI: 827 case SIOCSIFHWBROADCAST: 828 case SIOCSMIIREG: 829 case SIOCBONDENSLAVE: 830 case SIOCBONDRELEASE: 831 case SIOCBONDSETHWADDR: 832 case SIOCBONDCHANGEACTIVE: 833 case SIOCSHWTSTAMP: 834 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 835 return -EPERM; 836 fallthrough; 837 case SIOCBONDSLAVEINFOQUERY: 838 case SIOCBONDINFOQUERY: 839 dev_load(net, ifr->ifr_name); 840 841 rtnl_net_lock(net); 842 ret = dev_ifsioc(net, ifr, data, cmd); 843 rtnl_net_unlock(net); 844 845 if (need_copyout) 846 *need_copyout = false; 847 return ret; 848 849 case SIOCGIFMEM: 850 /* Get the per device memory space. We can add this but 851 * currently do not support it */ 852 case SIOCSIFMEM: 853 /* Set the per device memory buffer space. 854 * Not applicable in our case */ 855 case SIOCSIFLINK: 856 return -ENOTTY; 857 858 /* 859 * Unknown or private ioctl. 860 */ 861 default: 862 if (cmd == SIOCWANDEV || 863 cmd == SIOCGHWTSTAMP || 864 (cmd >= SIOCDEVPRIVATE && 865 cmd <= SIOCDEVPRIVATE + 15)) { 866 dev_load(net, ifr->ifr_name); 867 868 rtnl_net_lock(net); 869 ret = dev_ifsioc(net, ifr, data, cmd); 870 rtnl_net_unlock(net); 871 return ret; 872 } 873 return -ENOTTY; 874 } 875 } 876