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(struct ifreq *ifr) 187 { 188 struct hwtstamp_config cfg; 189 enum hwtstamp_tx_types tx_type; 190 enum hwtstamp_rx_filters rx_filter; 191 int tx_type_valid = 0; 192 int rx_filter_valid = 0; 193 194 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 195 return -EFAULT; 196 197 if (cfg.flags & ~HWTSTAMP_FLAG_MASK) 198 return -EINVAL; 199 200 tx_type = cfg.tx_type; 201 rx_filter = cfg.rx_filter; 202 203 switch (tx_type) { 204 case HWTSTAMP_TX_OFF: 205 case HWTSTAMP_TX_ON: 206 case HWTSTAMP_TX_ONESTEP_SYNC: 207 case HWTSTAMP_TX_ONESTEP_P2P: 208 tx_type_valid = 1; 209 break; 210 case __HWTSTAMP_TX_CNT: 211 /* not a real value */ 212 break; 213 } 214 215 switch (rx_filter) { 216 case HWTSTAMP_FILTER_NONE: 217 case HWTSTAMP_FILTER_ALL: 218 case HWTSTAMP_FILTER_SOME: 219 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 220 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 221 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 222 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 223 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 224 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 225 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 226 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 227 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 228 case HWTSTAMP_FILTER_PTP_V2_EVENT: 229 case HWTSTAMP_FILTER_PTP_V2_SYNC: 230 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 231 case HWTSTAMP_FILTER_NTP_ALL: 232 rx_filter_valid = 1; 233 break; 234 case __HWTSTAMP_FILTER_CNT: 235 /* not a real value */ 236 break; 237 } 238 239 if (!tx_type_valid || !rx_filter_valid) 240 return -ERANGE; 241 242 return 0; 243 } 244 245 static int dev_eth_ioctl(struct net_device *dev, 246 struct ifreq *ifr, unsigned int cmd) 247 { 248 const struct net_device_ops *ops = dev->netdev_ops; 249 int err; 250 251 err = dsa_ndo_eth_ioctl(dev, ifr, cmd); 252 if (err == 0 || err != -EOPNOTSUPP) 253 return err; 254 255 if (ops->ndo_eth_ioctl) { 256 if (netif_device_present(dev)) 257 err = ops->ndo_eth_ioctl(dev, ifr, cmd); 258 else 259 err = -ENODEV; 260 } 261 262 return err; 263 } 264 265 static int dev_siocbond(struct net_device *dev, 266 struct ifreq *ifr, unsigned int cmd) 267 { 268 const struct net_device_ops *ops = dev->netdev_ops; 269 270 if (ops->ndo_siocbond) { 271 if (netif_device_present(dev)) 272 return ops->ndo_siocbond(dev, ifr, cmd); 273 else 274 return -ENODEV; 275 } 276 277 return -EOPNOTSUPP; 278 } 279 280 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 281 void __user *data, unsigned int cmd) 282 { 283 const struct net_device_ops *ops = dev->netdev_ops; 284 285 if (ops->ndo_siocdevprivate) { 286 if (netif_device_present(dev)) 287 return ops->ndo_siocdevprivate(dev, ifr, data, cmd); 288 else 289 return -ENODEV; 290 } 291 292 return -EOPNOTSUPP; 293 } 294 295 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 296 { 297 const struct net_device_ops *ops = dev->netdev_ops; 298 299 if (ops->ndo_siocwandev) { 300 if (netif_device_present(dev)) 301 return ops->ndo_siocwandev(dev, ifs); 302 else 303 return -ENODEV; 304 } 305 306 return -EOPNOTSUPP; 307 } 308 309 /* 310 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 311 */ 312 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 313 unsigned int cmd) 314 { 315 int err; 316 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 317 const struct net_device_ops *ops; 318 netdevice_tracker dev_tracker; 319 320 if (!dev) 321 return -ENODEV; 322 323 ops = dev->netdev_ops; 324 325 switch (cmd) { 326 case SIOCSIFFLAGS: /* Set interface flags */ 327 return dev_change_flags(dev, ifr->ifr_flags, NULL); 328 329 case SIOCSIFMETRIC: /* Set the metric on the interface 330 (currently unused) */ 331 return -EOPNOTSUPP; 332 333 case SIOCSIFMTU: /* Set the MTU of a device */ 334 return dev_set_mtu(dev, ifr->ifr_mtu); 335 336 case SIOCSIFHWADDR: 337 if (dev->addr_len > sizeof(struct sockaddr)) 338 return -EINVAL; 339 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL); 340 341 case SIOCSIFHWBROADCAST: 342 if (ifr->ifr_hwaddr.sa_family != dev->type) 343 return -EINVAL; 344 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 345 min(sizeof(ifr->ifr_hwaddr.sa_data), 346 (size_t)dev->addr_len)); 347 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 348 return 0; 349 350 case SIOCSIFMAP: 351 return dev_setifmap(dev, ifr); 352 353 case SIOCADDMULTI: 354 if (!ops->ndo_set_rx_mode || 355 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 356 return -EINVAL; 357 if (!netif_device_present(dev)) 358 return -ENODEV; 359 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 360 361 case SIOCDELMULTI: 362 if (!ops->ndo_set_rx_mode || 363 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 364 return -EINVAL; 365 if (!netif_device_present(dev)) 366 return -ENODEV; 367 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 368 369 case SIOCSIFTXQLEN: 370 if (ifr->ifr_qlen < 0) 371 return -EINVAL; 372 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 373 374 case SIOCSIFNAME: 375 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 376 return dev_change_name(dev, ifr->ifr_newname); 377 378 case SIOCWANDEV: 379 return dev_siocwandev(dev, &ifr->ifr_settings); 380 381 case SIOCBRADDIF: 382 case SIOCBRDELIF: 383 if (!netif_device_present(dev)) 384 return -ENODEV; 385 if (!netif_is_bridge_master(dev)) 386 return -EOPNOTSUPP; 387 netdev_hold(dev, &dev_tracker, GFP_KERNEL); 388 rtnl_unlock(); 389 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL); 390 netdev_put(dev, &dev_tracker); 391 rtnl_lock(); 392 return err; 393 394 case SIOCSHWTSTAMP: 395 err = net_hwtstamp_validate(ifr); 396 if (err) 397 return err; 398 fallthrough; 399 400 /* 401 * Unknown or private ioctl 402 */ 403 default: 404 if (cmd >= SIOCDEVPRIVATE && 405 cmd <= SIOCDEVPRIVATE + 15) 406 return dev_siocdevprivate(dev, ifr, data, cmd); 407 408 if (cmd == SIOCGMIIPHY || 409 cmd == SIOCGMIIREG || 410 cmd == SIOCSMIIREG || 411 cmd == SIOCSHWTSTAMP || 412 cmd == SIOCGHWTSTAMP) { 413 err = dev_eth_ioctl(dev, ifr, cmd); 414 } else if (cmd == SIOCBONDENSLAVE || 415 cmd == SIOCBONDRELEASE || 416 cmd == SIOCBONDSETHWADDR || 417 cmd == SIOCBONDSLAVEINFOQUERY || 418 cmd == SIOCBONDINFOQUERY || 419 cmd == SIOCBONDCHANGEACTIVE) { 420 err = dev_siocbond(dev, ifr, cmd); 421 } else 422 err = -EINVAL; 423 424 } 425 return err; 426 } 427 428 /** 429 * dev_load - load a network module 430 * @net: the applicable net namespace 431 * @name: name of interface 432 * 433 * If a network interface is not present and the process has suitable 434 * privileges this function loads the module. If module loading is not 435 * available in this kernel then it becomes a nop. 436 */ 437 438 void dev_load(struct net *net, const char *name) 439 { 440 struct net_device *dev; 441 int no_module; 442 443 rcu_read_lock(); 444 dev = dev_get_by_name_rcu(net, name); 445 rcu_read_unlock(); 446 447 no_module = !dev; 448 if (no_module && capable(CAP_NET_ADMIN)) 449 no_module = request_module("netdev-%s", name); 450 if (no_module && capable(CAP_SYS_MODULE)) 451 request_module("%s", name); 452 } 453 EXPORT_SYMBOL(dev_load); 454 455 /* 456 * This function handles all "interface"-type I/O control requests. The actual 457 * 'doing' part of this is dev_ifsioc above. 458 */ 459 460 /** 461 * dev_ioctl - network device ioctl 462 * @net: the applicable net namespace 463 * @cmd: command to issue 464 * @ifr: pointer to a struct ifreq in user space 465 * @need_copyout: whether or not copy_to_user() should be called 466 * 467 * Issue ioctl functions to devices. This is normally called by the 468 * user space syscall interfaces but can sometimes be useful for 469 * other purposes. The return value is the return from the syscall if 470 * positive or a negative errno code on error. 471 */ 472 473 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 474 void __user *data, bool *need_copyout) 475 { 476 int ret; 477 char *colon; 478 479 if (need_copyout) 480 *need_copyout = true; 481 if (cmd == SIOCGIFNAME) 482 return dev_ifname(net, ifr); 483 484 ifr->ifr_name[IFNAMSIZ-1] = 0; 485 486 colon = strchr(ifr->ifr_name, ':'); 487 if (colon) 488 *colon = 0; 489 490 /* 491 * See which interface the caller is talking about. 492 */ 493 494 switch (cmd) { 495 case SIOCGIFHWADDR: 496 dev_load(net, ifr->ifr_name); 497 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name); 498 if (colon) 499 *colon = ':'; 500 return ret; 501 /* 502 * These ioctl calls: 503 * - can be done by all. 504 * - atomic and do not require locking. 505 * - return a value 506 */ 507 case SIOCGIFFLAGS: 508 case SIOCGIFMETRIC: 509 case SIOCGIFMTU: 510 case SIOCGIFSLAVE: 511 case SIOCGIFMAP: 512 case SIOCGIFINDEX: 513 case SIOCGIFTXQLEN: 514 dev_load(net, ifr->ifr_name); 515 rcu_read_lock(); 516 ret = dev_ifsioc_locked(net, ifr, cmd); 517 rcu_read_unlock(); 518 if (colon) 519 *colon = ':'; 520 return ret; 521 522 case SIOCETHTOOL: 523 dev_load(net, ifr->ifr_name); 524 ret = dev_ethtool(net, ifr, data); 525 if (colon) 526 *colon = ':'; 527 return ret; 528 529 /* 530 * These ioctl calls: 531 * - require superuser power. 532 * - require strict serialization. 533 * - return a value 534 */ 535 case SIOCGMIIPHY: 536 case SIOCGMIIREG: 537 case SIOCSIFNAME: 538 dev_load(net, ifr->ifr_name); 539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 540 return -EPERM; 541 rtnl_lock(); 542 ret = dev_ifsioc(net, ifr, data, cmd); 543 rtnl_unlock(); 544 if (colon) 545 *colon = ':'; 546 return ret; 547 548 /* 549 * These ioctl calls: 550 * - require superuser power. 551 * - require strict serialization. 552 * - do not return a value 553 */ 554 case SIOCSIFMAP: 555 case SIOCSIFTXQLEN: 556 if (!capable(CAP_NET_ADMIN)) 557 return -EPERM; 558 fallthrough; 559 /* 560 * These ioctl calls: 561 * - require local superuser power. 562 * - require strict serialization. 563 * - do not return a value 564 */ 565 case SIOCSIFFLAGS: 566 case SIOCSIFMETRIC: 567 case SIOCSIFMTU: 568 case SIOCSIFHWADDR: 569 case SIOCSIFSLAVE: 570 case SIOCADDMULTI: 571 case SIOCDELMULTI: 572 case SIOCSIFHWBROADCAST: 573 case SIOCSMIIREG: 574 case SIOCBONDENSLAVE: 575 case SIOCBONDRELEASE: 576 case SIOCBONDSETHWADDR: 577 case SIOCBONDCHANGEACTIVE: 578 case SIOCBRADDIF: 579 case SIOCBRDELIF: 580 case SIOCSHWTSTAMP: 581 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 582 return -EPERM; 583 fallthrough; 584 case SIOCBONDSLAVEINFOQUERY: 585 case SIOCBONDINFOQUERY: 586 dev_load(net, ifr->ifr_name); 587 rtnl_lock(); 588 ret = dev_ifsioc(net, ifr, data, cmd); 589 rtnl_unlock(); 590 if (need_copyout) 591 *need_copyout = false; 592 return ret; 593 594 case SIOCGIFMEM: 595 /* Get the per device memory space. We can add this but 596 * currently do not support it */ 597 case SIOCSIFMEM: 598 /* Set the per device memory buffer space. 599 * Not applicable in our case */ 600 case SIOCSIFLINK: 601 return -ENOTTY; 602 603 /* 604 * Unknown or private ioctl. 605 */ 606 default: 607 if (cmd == SIOCWANDEV || 608 cmd == SIOCGHWTSTAMP || 609 (cmd >= SIOCDEVPRIVATE && 610 cmd <= SIOCDEVPRIVATE + 15)) { 611 dev_load(net, ifr->ifr_name); 612 rtnl_lock(); 613 ret = dev_ifsioc(net, ifr, data, cmd); 614 rtnl_unlock(); 615 return ret; 616 } 617 return -ENOTTY; 618 } 619 } 620