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 -EOPNOTSUPP; 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 -EOPNOTSUPP; 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 int generic_hwtstamp_get_lower(struct net_device *dev, 442 struct kernel_hwtstamp_config *kernel_cfg) 443 { 444 const struct net_device_ops *ops = dev->netdev_ops; 445 int err; 446 447 if (!netif_device_present(dev)) 448 return -ENODEV; 449 450 if (!ops->ndo_hwtstamp_get) 451 return -EOPNOTSUPP; 452 453 netdev_lock_ops(dev); 454 err = dev_get_hwtstamp_phylib(dev, kernel_cfg); 455 netdev_unlock_ops(dev); 456 457 return err; 458 } 459 EXPORT_SYMBOL(generic_hwtstamp_get_lower); 460 461 int generic_hwtstamp_set_lower(struct net_device *dev, 462 struct kernel_hwtstamp_config *kernel_cfg, 463 struct netlink_ext_ack *extack) 464 { 465 const struct net_device_ops *ops = dev->netdev_ops; 466 int err; 467 468 if (!netif_device_present(dev)) 469 return -ENODEV; 470 471 if (!ops->ndo_hwtstamp_set) 472 return -EOPNOTSUPP; 473 474 netdev_lock_ops(dev); 475 err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack); 476 netdev_unlock_ops(dev); 477 478 return err; 479 } 480 EXPORT_SYMBOL(generic_hwtstamp_set_lower); 481 482 static int dev_siocbond(struct net_device *dev, 483 struct ifreq *ifr, unsigned int cmd) 484 { 485 const struct net_device_ops *ops = dev->netdev_ops; 486 487 if (ops->ndo_siocbond) { 488 int ret = -ENODEV; 489 490 netdev_lock_ops(dev); 491 if (netif_device_present(dev)) 492 ret = ops->ndo_siocbond(dev, ifr, cmd); 493 netdev_unlock_ops(dev); 494 495 return ret; 496 } 497 498 return -EOPNOTSUPP; 499 } 500 501 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 502 void __user *data, unsigned int cmd) 503 { 504 const struct net_device_ops *ops = dev->netdev_ops; 505 506 if (ops->ndo_siocdevprivate) { 507 int ret = -ENODEV; 508 509 netdev_lock_ops(dev); 510 if (netif_device_present(dev)) 511 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd); 512 netdev_unlock_ops(dev); 513 514 return ret; 515 } 516 517 return -EOPNOTSUPP; 518 } 519 520 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 521 { 522 const struct net_device_ops *ops = dev->netdev_ops; 523 524 if (ops->ndo_siocwandev) { 525 int ret = -ENODEV; 526 527 netdev_lock_ops(dev); 528 if (netif_device_present(dev)) 529 ret = ops->ndo_siocwandev(dev, ifs); 530 netdev_unlock_ops(dev); 531 532 return ret; 533 } 534 535 return -EOPNOTSUPP; 536 } 537 538 /* 539 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock() 540 */ 541 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 542 unsigned int cmd) 543 { 544 int err; 545 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 546 const struct net_device_ops *ops; 547 548 if (!dev) 549 return -ENODEV; 550 551 ops = dev->netdev_ops; 552 553 switch (cmd) { 554 case SIOCSIFFLAGS: /* Set interface flags */ 555 return dev_change_flags(dev, ifr->ifr_flags, NULL); 556 557 case SIOCSIFMETRIC: /* Set the metric on the interface 558 (currently unused) */ 559 return -EOPNOTSUPP; 560 561 case SIOCSIFMTU: /* Set the MTU of a device */ 562 return dev_set_mtu(dev, ifr->ifr_mtu); 563 564 case SIOCSIFHWADDR: 565 if (dev->addr_len > sizeof(ifr->ifr_hwaddr)) 566 return -EINVAL; 567 return dev_set_mac_address_user(dev, 568 (struct sockaddr_storage *)&ifr->ifr_hwaddr, 569 NULL); 570 571 case SIOCSIFHWBROADCAST: 572 if (ifr->ifr_hwaddr.sa_family != dev->type) 573 return -EINVAL; 574 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 575 min(sizeof(ifr->ifr_hwaddr.sa_data), 576 (size_t)dev->addr_len)); 577 netdev_lock_ops(dev); 578 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 579 netdev_unlock_ops(dev); 580 return 0; 581 582 case SIOCSIFMAP: 583 netdev_lock_ops(dev); 584 err = netif_setifmap(dev, ifr); 585 netdev_unlock_ops(dev); 586 return err; 587 588 case SIOCADDMULTI: 589 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) || 590 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 591 return -EINVAL; 592 if (!netif_device_present(dev)) 593 return -ENODEV; 594 netdev_lock_ops(dev); 595 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 596 netif_rx_mode_sync(dev); 597 netdev_unlock_ops(dev); 598 return err; 599 600 case SIOCDELMULTI: 601 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) || 602 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 603 return -EINVAL; 604 if (!netif_device_present(dev)) 605 return -ENODEV; 606 netdev_lock_ops(dev); 607 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 608 netif_rx_mode_sync(dev); 609 netdev_unlock_ops(dev); 610 return err; 611 612 case SIOCSIFTXQLEN: 613 if (ifr->ifr_qlen < 0) 614 return -EINVAL; 615 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 616 617 case SIOCSIFNAME: 618 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 619 return dev_change_name(dev, ifr->ifr_newname); 620 621 case SIOCWANDEV: 622 return dev_siocwandev(dev, &ifr->ifr_settings); 623 624 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15: 625 return dev_siocdevprivate(dev, ifr, data, cmd); 626 627 case SIOCSHWTSTAMP: 628 return dev_set_hwtstamp(dev, ifr); 629 630 case SIOCGHWTSTAMP: 631 return dev_get_hwtstamp(dev, ifr); 632 633 case SIOCGMIIPHY: 634 case SIOCGMIIREG: 635 case SIOCSMIIREG: 636 return dev_eth_ioctl(dev, ifr, cmd); 637 638 case SIOCBONDENSLAVE: 639 case SIOCBONDRELEASE: 640 case SIOCBONDSETHWADDR: 641 case SIOCBONDSLAVEINFOQUERY: 642 case SIOCBONDINFOQUERY: 643 case SIOCBONDCHANGEACTIVE: 644 return dev_siocbond(dev, ifr, cmd); 645 646 /* Unknown ioctl */ 647 default: 648 err = -EINVAL; 649 } 650 return err; 651 } 652 653 /** 654 * dev_load - load a network module 655 * @net: the applicable net namespace 656 * @name: name of interface 657 * 658 * If a network interface is not present and the process has suitable 659 * privileges this function loads the module. If module loading is not 660 * available in this kernel then it becomes a nop. 661 */ 662 663 void dev_load(struct net *net, const char *name) 664 { 665 struct net_device *dev; 666 int no_module; 667 668 rcu_read_lock(); 669 dev = dev_get_by_name_rcu(net, name); 670 rcu_read_unlock(); 671 672 no_module = !dev; 673 if (no_module && capable(CAP_NET_ADMIN)) 674 no_module = request_module("netdev-%s", name); 675 if (no_module && capable(CAP_SYS_MODULE)) 676 request_module("%s", name); 677 } 678 EXPORT_SYMBOL(dev_load); 679 680 /* 681 * This function handles all "interface"-type I/O control requests. The actual 682 * 'doing' part of this is dev_ifsioc above. 683 */ 684 685 /** 686 * dev_ioctl - network device ioctl 687 * @net: the applicable net namespace 688 * @cmd: command to issue 689 * @ifr: pointer to a struct ifreq in user space 690 * @data: data exchanged with userspace 691 * @need_copyout: whether or not copy_to_user() should be called 692 * 693 * Issue ioctl functions to devices. This is normally called by the 694 * user space syscall interfaces but can sometimes be useful for 695 * other purposes. The return value is the return from the syscall if 696 * positive or a negative errno code on error. 697 */ 698 699 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 700 void __user *data, bool *need_copyout) 701 { 702 int ret; 703 char *colon; 704 705 if (need_copyout) 706 *need_copyout = true; 707 if (cmd == SIOCGIFNAME) 708 return dev_ifname(net, ifr); 709 710 ifr->ifr_name[IFNAMSIZ-1] = 0; 711 712 colon = strchr(ifr->ifr_name, ':'); 713 if (colon) 714 *colon = 0; 715 716 /* 717 * See which interface the caller is talking about. 718 */ 719 720 switch (cmd) { 721 case SIOCGIFHWADDR: 722 dev_load(net, ifr->ifr_name); 723 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net, 724 ifr->ifr_name); 725 if (colon) 726 *colon = ':'; 727 return ret; 728 /* 729 * These ioctl calls: 730 * - can be done by all. 731 * - atomic and do not require locking. 732 * - return a value 733 */ 734 case SIOCGIFFLAGS: 735 case SIOCGIFMETRIC: 736 case SIOCGIFMTU: 737 case SIOCGIFSLAVE: 738 case SIOCGIFMAP: 739 case SIOCGIFINDEX: 740 case SIOCGIFTXQLEN: 741 dev_load(net, ifr->ifr_name); 742 rcu_read_lock(); 743 ret = dev_ifsioc_locked(net, ifr, cmd); 744 rcu_read_unlock(); 745 if (colon) 746 *colon = ':'; 747 return ret; 748 749 case SIOCETHTOOL: 750 dev_load(net, ifr->ifr_name); 751 ret = dev_ethtool(net, ifr, data); 752 if (colon) 753 *colon = ':'; 754 return ret; 755 756 /* 757 * These ioctl calls: 758 * - require superuser power. 759 * - require strict serialization. 760 * - return a value 761 */ 762 case SIOCGMIIPHY: 763 case SIOCGMIIREG: 764 case SIOCSIFNAME: 765 dev_load(net, ifr->ifr_name); 766 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 767 return -EPERM; 768 769 rtnl_net_lock(net); 770 ret = dev_ifsioc(net, ifr, data, cmd); 771 rtnl_net_unlock(net); 772 773 if (colon) 774 *colon = ':'; 775 return ret; 776 777 /* 778 * These ioctl calls: 779 * - require superuser power. 780 * - require strict serialization. 781 * - do not return a value 782 */ 783 case SIOCSIFMAP: 784 case SIOCSIFTXQLEN: 785 if (!capable(CAP_NET_ADMIN)) 786 return -EPERM; 787 fallthrough; 788 /* 789 * These ioctl calls: 790 * - require local superuser power. 791 * - require strict serialization. 792 * - do not return a value 793 */ 794 case SIOCSIFFLAGS: 795 case SIOCSIFMETRIC: 796 case SIOCSIFMTU: 797 case SIOCSIFHWADDR: 798 case SIOCSIFSLAVE: 799 case SIOCADDMULTI: 800 case SIOCDELMULTI: 801 case SIOCSIFHWBROADCAST: 802 case SIOCSMIIREG: 803 case SIOCBONDENSLAVE: 804 case SIOCBONDRELEASE: 805 case SIOCBONDSETHWADDR: 806 case SIOCBONDCHANGEACTIVE: 807 case SIOCSHWTSTAMP: 808 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 809 return -EPERM; 810 fallthrough; 811 case SIOCBONDSLAVEINFOQUERY: 812 case SIOCBONDINFOQUERY: 813 dev_load(net, ifr->ifr_name); 814 815 rtnl_net_lock(net); 816 ret = dev_ifsioc(net, ifr, data, cmd); 817 rtnl_net_unlock(net); 818 819 if (need_copyout) 820 *need_copyout = false; 821 return ret; 822 823 case SIOCGIFMEM: 824 /* Get the per device memory space. We can add this but 825 * currently do not support it */ 826 case SIOCSIFMEM: 827 /* Set the per device memory buffer space. 828 * Not applicable in our case */ 829 case SIOCSIFLINK: 830 return -ENOTTY; 831 832 /* 833 * Unknown or private ioctl. 834 */ 835 default: 836 if (cmd == SIOCWANDEV || 837 cmd == SIOCGHWTSTAMP || 838 (cmd >= SIOCDEVPRIVATE && 839 cmd <= SIOCDEVPRIVATE + 15)) { 840 dev_load(net, ifr->ifr_name); 841 842 rtnl_net_lock(net); 843 ret = dev_ifsioc(net, ifr, data, cmd); 844 rtnl_net_unlock(net); 845 return ret; 846 } 847 return -ENOTTY; 848 } 849 } 850