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/wireless.h> 9 #include <linux/if_bridge.h> 10 #include <net/dsa.h> 11 #include <net/wext.h> 12 13 #include "dev.h" 14 15 /* 16 * Map an interface index to its name (SIOCGIFNAME) 17 */ 18 19 /* 20 * We need this ioctl for efficient implementation of the 21 * if_indextoname() function required by the IPv6 API. Without 22 * it, we would have to search all the interfaces to find a 23 * match. --pb 24 */ 25 26 static int dev_ifname(struct net *net, struct ifreq *ifr) 27 { 28 ifr->ifr_name[IFNAMSIZ-1] = 0; 29 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); 30 } 31 32 /* 33 * Perform a SIOCGIFCONF call. This structure will change 34 * size eventually, and there is nothing I can do about it. 35 * Thus we will need a 'compatibility mode'. 36 */ 37 int dev_ifconf(struct net *net, struct ifconf __user *uifc) 38 { 39 struct net_device *dev; 40 void __user *pos; 41 size_t size; 42 int len, total = 0, done; 43 44 /* both the ifconf and the ifreq structures are slightly different */ 45 if (in_compat_syscall()) { 46 struct compat_ifconf ifc32; 47 48 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf))) 49 return -EFAULT; 50 51 pos = compat_ptr(ifc32.ifcbuf); 52 len = ifc32.ifc_len; 53 size = sizeof(struct compat_ifreq); 54 } else { 55 struct ifconf ifc; 56 57 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 58 return -EFAULT; 59 60 pos = ifc.ifc_buf; 61 len = ifc.ifc_len; 62 size = sizeof(struct ifreq); 63 } 64 65 /* Loop over the interfaces, and write an info block for each. */ 66 rtnl_lock(); 67 for_each_netdev(net, dev) { 68 if (!pos) 69 done = inet_gifconf(dev, NULL, 0, size); 70 else 71 done = inet_gifconf(dev, pos + total, 72 len - total, size); 73 if (done < 0) { 74 rtnl_unlock(); 75 return -EFAULT; 76 } 77 total += done; 78 } 79 rtnl_unlock(); 80 81 return put_user(total, &uifc->ifc_len); 82 } 83 84 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr) 85 { 86 struct ifmap *ifmap = &ifr->ifr_map; 87 88 if (in_compat_syscall()) { 89 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap; 90 91 cifmap->mem_start = dev->mem_start; 92 cifmap->mem_end = dev->mem_end; 93 cifmap->base_addr = dev->base_addr; 94 cifmap->irq = dev->irq; 95 cifmap->dma = dev->dma; 96 cifmap->port = dev->if_port; 97 98 return 0; 99 } 100 101 ifmap->mem_start = dev->mem_start; 102 ifmap->mem_end = dev->mem_end; 103 ifmap->base_addr = dev->base_addr; 104 ifmap->irq = dev->irq; 105 ifmap->dma = dev->dma; 106 ifmap->port = dev->if_port; 107 108 return 0; 109 } 110 111 static int dev_setifmap(struct net_device *dev, struct ifreq *ifr) 112 { 113 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map; 114 115 if (!dev->netdev_ops->ndo_set_config) 116 return -EOPNOTSUPP; 117 118 if (in_compat_syscall()) { 119 struct ifmap ifmap = { 120 .mem_start = cifmap->mem_start, 121 .mem_end = cifmap->mem_end, 122 .base_addr = cifmap->base_addr, 123 .irq = cifmap->irq, 124 .dma = cifmap->dma, 125 .port = cifmap->port, 126 }; 127 128 return dev->netdev_ops->ndo_set_config(dev, &ifmap); 129 } 130 131 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map); 132 } 133 134 /* 135 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 136 */ 137 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 138 { 139 int err; 140 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 141 142 if (!dev) 143 return -ENODEV; 144 145 switch (cmd) { 146 case SIOCGIFFLAGS: /* Get interface flags */ 147 ifr->ifr_flags = (short) dev_get_flags(dev); 148 return 0; 149 150 case SIOCGIFMETRIC: /* Get the metric on the interface 151 (currently unused) */ 152 ifr->ifr_metric = 0; 153 return 0; 154 155 case SIOCGIFMTU: /* Get the MTU of a device */ 156 ifr->ifr_mtu = dev->mtu; 157 return 0; 158 159 case SIOCGIFSLAVE: 160 err = -EINVAL; 161 break; 162 163 case SIOCGIFMAP: 164 return dev_getifmap(dev, ifr); 165 166 case SIOCGIFINDEX: 167 ifr->ifr_ifindex = dev->ifindex; 168 return 0; 169 170 case SIOCGIFTXQLEN: 171 ifr->ifr_qlen = dev->tx_queue_len; 172 return 0; 173 174 default: 175 /* dev_ioctl() should ensure this case 176 * is never reached 177 */ 178 WARN_ON(1); 179 err = -ENOTTY; 180 break; 181 182 } 183 return err; 184 } 185 186 static int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg) 187 { 188 enum hwtstamp_tx_types tx_type; 189 enum hwtstamp_rx_filters rx_filter; 190 int tx_type_valid = 0; 191 int rx_filter_valid = 0; 192 193 if (cfg->flags & ~HWTSTAMP_FLAG_MASK) 194 return -EINVAL; 195 196 tx_type = cfg->tx_type; 197 rx_filter = cfg->rx_filter; 198 199 switch (tx_type) { 200 case HWTSTAMP_TX_OFF: 201 case HWTSTAMP_TX_ON: 202 case HWTSTAMP_TX_ONESTEP_SYNC: 203 case HWTSTAMP_TX_ONESTEP_P2P: 204 tx_type_valid = 1; 205 break; 206 case __HWTSTAMP_TX_CNT: 207 /* not a real value */ 208 break; 209 } 210 211 switch (rx_filter) { 212 case HWTSTAMP_FILTER_NONE: 213 case HWTSTAMP_FILTER_ALL: 214 case HWTSTAMP_FILTER_SOME: 215 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 216 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 217 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 218 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 219 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 220 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 221 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 222 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 223 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 224 case HWTSTAMP_FILTER_PTP_V2_EVENT: 225 case HWTSTAMP_FILTER_PTP_V2_SYNC: 226 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 227 case HWTSTAMP_FILTER_NTP_ALL: 228 rx_filter_valid = 1; 229 break; 230 case __HWTSTAMP_FILTER_CNT: 231 /* not a real value */ 232 break; 233 } 234 235 if (!tx_type_valid || !rx_filter_valid) 236 return -ERANGE; 237 238 return 0; 239 } 240 241 static int dev_eth_ioctl(struct net_device *dev, 242 struct ifreq *ifr, unsigned int cmd) 243 { 244 const struct net_device_ops *ops = dev->netdev_ops; 245 246 if (!ops->ndo_eth_ioctl) 247 return -EOPNOTSUPP; 248 249 if (!netif_device_present(dev)) 250 return -ENODEV; 251 252 return ops->ndo_eth_ioctl(dev, ifr, cmd); 253 } 254 255 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr) 256 { 257 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); 258 } 259 260 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr) 261 { 262 struct netdev_notifier_hwtstamp_info info = { 263 .info.dev = dev, 264 }; 265 struct kernel_hwtstamp_config kernel_cfg; 266 struct netlink_ext_ack extack = {}; 267 struct hwtstamp_config cfg; 268 int err; 269 270 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 271 return -EFAULT; 272 273 hwtstamp_config_to_kernel(&kernel_cfg, &cfg); 274 275 err = net_hwtstamp_validate(&kernel_cfg); 276 if (err) 277 return err; 278 279 info.info.extack = &extack; 280 info.config = &kernel_cfg; 281 282 err = call_netdevice_notifiers_info(NETDEV_PRE_CHANGE_HWTSTAMP, 283 &info.info); 284 err = notifier_to_errno(err); 285 if (err) { 286 if (extack._msg) 287 netdev_err(dev, "%s\n", extack._msg); 288 return err; 289 } 290 291 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); 292 } 293 294 static int dev_siocbond(struct net_device *dev, 295 struct ifreq *ifr, unsigned int cmd) 296 { 297 const struct net_device_ops *ops = dev->netdev_ops; 298 299 if (ops->ndo_siocbond) { 300 if (netif_device_present(dev)) 301 return ops->ndo_siocbond(dev, ifr, cmd); 302 else 303 return -ENODEV; 304 } 305 306 return -EOPNOTSUPP; 307 } 308 309 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 310 void __user *data, unsigned int cmd) 311 { 312 const struct net_device_ops *ops = dev->netdev_ops; 313 314 if (ops->ndo_siocdevprivate) { 315 if (netif_device_present(dev)) 316 return ops->ndo_siocdevprivate(dev, ifr, data, cmd); 317 else 318 return -ENODEV; 319 } 320 321 return -EOPNOTSUPP; 322 } 323 324 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 325 { 326 const struct net_device_ops *ops = dev->netdev_ops; 327 328 if (ops->ndo_siocwandev) { 329 if (netif_device_present(dev)) 330 return ops->ndo_siocwandev(dev, ifs); 331 else 332 return -ENODEV; 333 } 334 335 return -EOPNOTSUPP; 336 } 337 338 /* 339 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 340 */ 341 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 342 unsigned int cmd) 343 { 344 int err; 345 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 346 const struct net_device_ops *ops; 347 netdevice_tracker dev_tracker; 348 349 if (!dev) 350 return -ENODEV; 351 352 ops = dev->netdev_ops; 353 354 switch (cmd) { 355 case SIOCSIFFLAGS: /* Set interface flags */ 356 return dev_change_flags(dev, ifr->ifr_flags, NULL); 357 358 case SIOCSIFMETRIC: /* Set the metric on the interface 359 (currently unused) */ 360 return -EOPNOTSUPP; 361 362 case SIOCSIFMTU: /* Set the MTU of a device */ 363 return dev_set_mtu(dev, ifr->ifr_mtu); 364 365 case SIOCSIFHWADDR: 366 if (dev->addr_len > sizeof(struct sockaddr)) 367 return -EINVAL; 368 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL); 369 370 case SIOCSIFHWBROADCAST: 371 if (ifr->ifr_hwaddr.sa_family != dev->type) 372 return -EINVAL; 373 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 374 min(sizeof(ifr->ifr_hwaddr.sa_data_min), 375 (size_t)dev->addr_len)); 376 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 377 return 0; 378 379 case SIOCSIFMAP: 380 return dev_setifmap(dev, ifr); 381 382 case SIOCADDMULTI: 383 if (!ops->ndo_set_rx_mode || 384 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 385 return -EINVAL; 386 if (!netif_device_present(dev)) 387 return -ENODEV; 388 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 389 390 case SIOCDELMULTI: 391 if (!ops->ndo_set_rx_mode || 392 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 393 return -EINVAL; 394 if (!netif_device_present(dev)) 395 return -ENODEV; 396 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 397 398 case SIOCSIFTXQLEN: 399 if (ifr->ifr_qlen < 0) 400 return -EINVAL; 401 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 402 403 case SIOCSIFNAME: 404 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 405 return dev_change_name(dev, ifr->ifr_newname); 406 407 case SIOCWANDEV: 408 return dev_siocwandev(dev, &ifr->ifr_settings); 409 410 case SIOCBRADDIF: 411 case SIOCBRDELIF: 412 if (!netif_device_present(dev)) 413 return -ENODEV; 414 if (!netif_is_bridge_master(dev)) 415 return -EOPNOTSUPP; 416 netdev_hold(dev, &dev_tracker, GFP_KERNEL); 417 rtnl_unlock(); 418 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL); 419 netdev_put(dev, &dev_tracker); 420 rtnl_lock(); 421 return err; 422 423 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15: 424 return dev_siocdevprivate(dev, ifr, data, cmd); 425 426 case SIOCSHWTSTAMP: 427 return dev_set_hwtstamp(dev, ifr); 428 429 case SIOCGHWTSTAMP: 430 return dev_get_hwtstamp(dev, ifr); 431 432 case SIOCGMIIPHY: 433 case SIOCGMIIREG: 434 case SIOCSMIIREG: 435 return dev_eth_ioctl(dev, ifr, cmd); 436 437 case SIOCBONDENSLAVE: 438 case SIOCBONDRELEASE: 439 case SIOCBONDSETHWADDR: 440 case SIOCBONDSLAVEINFOQUERY: 441 case SIOCBONDINFOQUERY: 442 case SIOCBONDCHANGEACTIVE: 443 return dev_siocbond(dev, ifr, cmd); 444 445 /* Unknown ioctl */ 446 default: 447 err = -EINVAL; 448 } 449 return err; 450 } 451 452 /** 453 * dev_load - load a network module 454 * @net: the applicable net namespace 455 * @name: name of interface 456 * 457 * If a network interface is not present and the process has suitable 458 * privileges this function loads the module. If module loading is not 459 * available in this kernel then it becomes a nop. 460 */ 461 462 void dev_load(struct net *net, const char *name) 463 { 464 struct net_device *dev; 465 int no_module; 466 467 rcu_read_lock(); 468 dev = dev_get_by_name_rcu(net, name); 469 rcu_read_unlock(); 470 471 no_module = !dev; 472 if (no_module && capable(CAP_NET_ADMIN)) 473 no_module = request_module("netdev-%s", name); 474 if (no_module && capable(CAP_SYS_MODULE)) 475 request_module("%s", name); 476 } 477 EXPORT_SYMBOL(dev_load); 478 479 /* 480 * This function handles all "interface"-type I/O control requests. The actual 481 * 'doing' part of this is dev_ifsioc above. 482 */ 483 484 /** 485 * dev_ioctl - network device ioctl 486 * @net: the applicable net namespace 487 * @cmd: command to issue 488 * @ifr: pointer to a struct ifreq in user space 489 * @data: data exchanged with userspace 490 * @need_copyout: whether or not copy_to_user() should be called 491 * 492 * Issue ioctl functions to devices. This is normally called by the 493 * user space syscall interfaces but can sometimes be useful for 494 * other purposes. The return value is the return from the syscall if 495 * positive or a negative errno code on error. 496 */ 497 498 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 499 void __user *data, bool *need_copyout) 500 { 501 int ret; 502 char *colon; 503 504 if (need_copyout) 505 *need_copyout = true; 506 if (cmd == SIOCGIFNAME) 507 return dev_ifname(net, ifr); 508 509 ifr->ifr_name[IFNAMSIZ-1] = 0; 510 511 colon = strchr(ifr->ifr_name, ':'); 512 if (colon) 513 *colon = 0; 514 515 /* 516 * See which interface the caller is talking about. 517 */ 518 519 switch (cmd) { 520 case SIOCGIFHWADDR: 521 dev_load(net, ifr->ifr_name); 522 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name); 523 if (colon) 524 *colon = ':'; 525 return ret; 526 /* 527 * These ioctl calls: 528 * - can be done by all. 529 * - atomic and do not require locking. 530 * - return a value 531 */ 532 case SIOCGIFFLAGS: 533 case SIOCGIFMETRIC: 534 case SIOCGIFMTU: 535 case SIOCGIFSLAVE: 536 case SIOCGIFMAP: 537 case SIOCGIFINDEX: 538 case SIOCGIFTXQLEN: 539 dev_load(net, ifr->ifr_name); 540 rcu_read_lock(); 541 ret = dev_ifsioc_locked(net, ifr, cmd); 542 rcu_read_unlock(); 543 if (colon) 544 *colon = ':'; 545 return ret; 546 547 case SIOCETHTOOL: 548 dev_load(net, ifr->ifr_name); 549 ret = dev_ethtool(net, ifr, data); 550 if (colon) 551 *colon = ':'; 552 return ret; 553 554 /* 555 * These ioctl calls: 556 * - require superuser power. 557 * - require strict serialization. 558 * - return a value 559 */ 560 case SIOCGMIIPHY: 561 case SIOCGMIIREG: 562 case SIOCSIFNAME: 563 dev_load(net, ifr->ifr_name); 564 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 565 return -EPERM; 566 rtnl_lock(); 567 ret = dev_ifsioc(net, ifr, data, cmd); 568 rtnl_unlock(); 569 if (colon) 570 *colon = ':'; 571 return ret; 572 573 /* 574 * These ioctl calls: 575 * - require superuser power. 576 * - require strict serialization. 577 * - do not return a value 578 */ 579 case SIOCSIFMAP: 580 case SIOCSIFTXQLEN: 581 if (!capable(CAP_NET_ADMIN)) 582 return -EPERM; 583 fallthrough; 584 /* 585 * These ioctl calls: 586 * - require local superuser power. 587 * - require strict serialization. 588 * - do not return a value 589 */ 590 case SIOCSIFFLAGS: 591 case SIOCSIFMETRIC: 592 case SIOCSIFMTU: 593 case SIOCSIFHWADDR: 594 case SIOCSIFSLAVE: 595 case SIOCADDMULTI: 596 case SIOCDELMULTI: 597 case SIOCSIFHWBROADCAST: 598 case SIOCSMIIREG: 599 case SIOCBONDENSLAVE: 600 case SIOCBONDRELEASE: 601 case SIOCBONDSETHWADDR: 602 case SIOCBONDCHANGEACTIVE: 603 case SIOCBRADDIF: 604 case SIOCBRDELIF: 605 case SIOCSHWTSTAMP: 606 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 607 return -EPERM; 608 fallthrough; 609 case SIOCBONDSLAVEINFOQUERY: 610 case SIOCBONDINFOQUERY: 611 dev_load(net, ifr->ifr_name); 612 rtnl_lock(); 613 ret = dev_ifsioc(net, ifr, data, cmd); 614 rtnl_unlock(); 615 if (need_copyout) 616 *need_copyout = false; 617 return ret; 618 619 case SIOCGIFMEM: 620 /* Get the per device memory space. We can add this but 621 * currently do not support it */ 622 case SIOCSIFMEM: 623 /* Set the per device memory buffer space. 624 * Not applicable in our case */ 625 case SIOCSIFLINK: 626 return -ENOTTY; 627 628 /* 629 * Unknown or private ioctl. 630 */ 631 default: 632 if (cmd == SIOCWANDEV || 633 cmd == SIOCGHWTSTAMP || 634 (cmd >= SIOCDEVPRIVATE && 635 cmd <= SIOCDEVPRIVATE + 15)) { 636 dev_load(net, ifr->ifr_name); 637 rtnl_lock(); 638 ret = dev_ifsioc(net, ifr, data, cmd); 639 rtnl_unlock(); 640 return ret; 641 } 642 return -ENOTTY; 643 } 644 } 645