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