1 #include <linux/kmod.h> 2 #include <linux/netdevice.h> 3 #include <linux/etherdevice.h> 4 #include <linux/rtnetlink.h> 5 #include <linux/net_tstamp.h> 6 #include <linux/wireless.h> 7 #include <net/wext.h> 8 9 /* 10 * Map an interface index to its name (SIOCGIFNAME) 11 */ 12 13 /* 14 * We need this ioctl for efficient implementation of the 15 * if_indextoname() function required by the IPv6 API. Without 16 * it, we would have to search all the interfaces to find a 17 * match. --pb 18 */ 19 20 static int dev_ifname(struct net *net, struct ifreq __user *arg) 21 { 22 struct ifreq ifr; 23 int error; 24 25 /* 26 * Fetch the caller's info block. 27 */ 28 29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 30 return -EFAULT; 31 ifr.ifr_name[IFNAMSIZ-1] = 0; 32 33 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex); 34 if (error) 35 return error; 36 37 if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) 38 return -EFAULT; 39 return 0; 40 } 41 42 static gifconf_func_t *gifconf_list[NPROTO]; 43 44 /** 45 * register_gifconf - register a SIOCGIF handler 46 * @family: Address family 47 * @gifconf: Function handler 48 * 49 * Register protocol dependent address dumping routines. The handler 50 * that is passed must not be freed or reused until it has been replaced 51 * by another handler. 52 */ 53 int register_gifconf(unsigned int family, gifconf_func_t *gifconf) 54 { 55 if (family >= NPROTO) 56 return -EINVAL; 57 gifconf_list[family] = gifconf; 58 return 0; 59 } 60 EXPORT_SYMBOL(register_gifconf); 61 62 /* 63 * Perform a SIOCGIFCONF call. This structure will change 64 * size eventually, and there is nothing I can do about it. 65 * Thus we will need a 'compatibility mode'. 66 */ 67 68 static int dev_ifconf(struct net *net, char __user *arg) 69 { 70 struct ifconf ifc; 71 struct net_device *dev; 72 char __user *pos; 73 int len; 74 int total; 75 int i; 76 77 /* 78 * Fetch the caller's info block. 79 */ 80 81 if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) 82 return -EFAULT; 83 84 pos = ifc.ifc_buf; 85 len = ifc.ifc_len; 86 87 /* 88 * Loop over the interfaces, and write an info block for each. 89 */ 90 91 total = 0; 92 for_each_netdev(net, dev) { 93 for (i = 0; i < NPROTO; i++) { 94 if (gifconf_list[i]) { 95 int done; 96 if (!pos) 97 done = gifconf_list[i](dev, NULL, 0); 98 else 99 done = gifconf_list[i](dev, pos + total, 100 len - total); 101 if (done < 0) 102 return -EFAULT; 103 total += done; 104 } 105 } 106 } 107 108 /* 109 * All done. Write the updated control block back to the caller. 110 */ 111 ifc.ifc_len = total; 112 113 /* 114 * Both BSD and Solaris return 0 here, so we do too. 115 */ 116 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; 117 } 118 119 /* 120 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 121 */ 122 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 123 { 124 int err; 125 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 126 127 if (!dev) 128 return -ENODEV; 129 130 switch (cmd) { 131 case SIOCGIFFLAGS: /* Get interface flags */ 132 ifr->ifr_flags = (short) dev_get_flags(dev); 133 return 0; 134 135 case SIOCGIFMETRIC: /* Get the metric on the interface 136 (currently unused) */ 137 ifr->ifr_metric = 0; 138 return 0; 139 140 case SIOCGIFMTU: /* Get the MTU of a device */ 141 ifr->ifr_mtu = dev->mtu; 142 return 0; 143 144 case SIOCGIFHWADDR: 145 if (!dev->addr_len) 146 memset(ifr->ifr_hwaddr.sa_data, 0, 147 sizeof(ifr->ifr_hwaddr.sa_data)); 148 else 149 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, 150 min(sizeof(ifr->ifr_hwaddr.sa_data), 151 (size_t)dev->addr_len)); 152 ifr->ifr_hwaddr.sa_family = dev->type; 153 return 0; 154 155 case SIOCGIFSLAVE: 156 err = -EINVAL; 157 break; 158 159 case SIOCGIFMAP: 160 ifr->ifr_map.mem_start = dev->mem_start; 161 ifr->ifr_map.mem_end = dev->mem_end; 162 ifr->ifr_map.base_addr = dev->base_addr; 163 ifr->ifr_map.irq = dev->irq; 164 ifr->ifr_map.dma = dev->dma; 165 ifr->ifr_map.port = dev->if_port; 166 return 0; 167 168 case SIOCGIFINDEX: 169 ifr->ifr_ifindex = dev->ifindex; 170 return 0; 171 172 case SIOCGIFTXQLEN: 173 ifr->ifr_qlen = dev->tx_queue_len; 174 return 0; 175 176 default: 177 /* dev_ioctl() should ensure this case 178 * is never reached 179 */ 180 WARN_ON(1); 181 err = -ENOTTY; 182 break; 183 184 } 185 return err; 186 } 187 188 static int net_hwtstamp_validate(struct ifreq *ifr) 189 { 190 struct hwtstamp_config cfg; 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 (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 197 return -EFAULT; 198 199 if (cfg.flags) /* reserved for future extensions */ 200 return -EINVAL; 201 202 tx_type = cfg.tx_type; 203 rx_filter = cfg.rx_filter; 204 205 switch (tx_type) { 206 case HWTSTAMP_TX_OFF: 207 case HWTSTAMP_TX_ON: 208 case HWTSTAMP_TX_ONESTEP_SYNC: 209 tx_type_valid = 1; 210 break; 211 } 212 213 switch (rx_filter) { 214 case HWTSTAMP_FILTER_NONE: 215 case HWTSTAMP_FILTER_ALL: 216 case HWTSTAMP_FILTER_SOME: 217 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 218 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 219 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 220 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 221 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 222 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 223 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 224 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 225 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 226 case HWTSTAMP_FILTER_PTP_V2_EVENT: 227 case HWTSTAMP_FILTER_PTP_V2_SYNC: 228 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 229 case HWTSTAMP_FILTER_NTP_ALL: 230 rx_filter_valid = 1; 231 break; 232 } 233 234 if (!tx_type_valid || !rx_filter_valid) 235 return -ERANGE; 236 237 return 0; 238 } 239 240 /* 241 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 242 */ 243 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) 244 { 245 int err; 246 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 247 const struct net_device_ops *ops; 248 249 if (!dev) 250 return -ENODEV; 251 252 ops = dev->netdev_ops; 253 254 switch (cmd) { 255 case SIOCSIFFLAGS: /* Set interface flags */ 256 return dev_change_flags(dev, ifr->ifr_flags); 257 258 case SIOCSIFMETRIC: /* Set the metric on the interface 259 (currently unused) */ 260 return -EOPNOTSUPP; 261 262 case SIOCSIFMTU: /* Set the MTU of a device */ 263 return dev_set_mtu(dev, ifr->ifr_mtu); 264 265 case SIOCSIFHWADDR: 266 if (dev->addr_len > sizeof(struct sockaddr)) 267 return -EINVAL; 268 return dev_set_mac_address(dev, &ifr->ifr_hwaddr); 269 270 case SIOCSIFHWBROADCAST: 271 if (ifr->ifr_hwaddr.sa_family != dev->type) 272 return -EINVAL; 273 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 274 min(sizeof(ifr->ifr_hwaddr.sa_data), 275 (size_t)dev->addr_len)); 276 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 277 return 0; 278 279 case SIOCSIFMAP: 280 if (ops->ndo_set_config) { 281 if (!netif_device_present(dev)) 282 return -ENODEV; 283 return ops->ndo_set_config(dev, &ifr->ifr_map); 284 } 285 return -EOPNOTSUPP; 286 287 case SIOCADDMULTI: 288 if (!ops->ndo_set_rx_mode || 289 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 290 return -EINVAL; 291 if (!netif_device_present(dev)) 292 return -ENODEV; 293 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 294 295 case SIOCDELMULTI: 296 if (!ops->ndo_set_rx_mode || 297 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 298 return -EINVAL; 299 if (!netif_device_present(dev)) 300 return -ENODEV; 301 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 302 303 case SIOCSIFTXQLEN: 304 if (ifr->ifr_qlen < 0) 305 return -EINVAL; 306 if (dev->tx_queue_len ^ ifr->ifr_qlen) { 307 unsigned int orig_len = dev->tx_queue_len; 308 309 dev->tx_queue_len = ifr->ifr_qlen; 310 err = call_netdevice_notifiers( 311 NETDEV_CHANGE_TX_QUEUE_LEN, dev); 312 err = notifier_to_errno(err); 313 if (err) { 314 dev->tx_queue_len = orig_len; 315 return err; 316 } 317 } 318 return 0; 319 320 case SIOCSIFNAME: 321 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 322 return dev_change_name(dev, ifr->ifr_newname); 323 324 case SIOCSHWTSTAMP: 325 err = net_hwtstamp_validate(ifr); 326 if (err) 327 return err; 328 /* fall through */ 329 330 /* 331 * Unknown or private ioctl 332 */ 333 default: 334 if ((cmd >= SIOCDEVPRIVATE && 335 cmd <= SIOCDEVPRIVATE + 15) || 336 cmd == SIOCBONDENSLAVE || 337 cmd == SIOCBONDRELEASE || 338 cmd == SIOCBONDSETHWADDR || 339 cmd == SIOCBONDSLAVEINFOQUERY || 340 cmd == SIOCBONDINFOQUERY || 341 cmd == SIOCBONDCHANGEACTIVE || 342 cmd == SIOCGMIIPHY || 343 cmd == SIOCGMIIREG || 344 cmd == SIOCSMIIREG || 345 cmd == SIOCBRADDIF || 346 cmd == SIOCBRDELIF || 347 cmd == SIOCSHWTSTAMP || 348 cmd == SIOCGHWTSTAMP || 349 cmd == SIOCWANDEV) { 350 err = -EOPNOTSUPP; 351 if (ops->ndo_do_ioctl) { 352 if (netif_device_present(dev)) 353 err = ops->ndo_do_ioctl(dev, ifr, cmd); 354 else 355 err = -ENODEV; 356 } 357 } else 358 err = -EINVAL; 359 360 } 361 return err; 362 } 363 364 /** 365 * dev_load - load a network module 366 * @net: the applicable net namespace 367 * @name: name of interface 368 * 369 * If a network interface is not present and the process has suitable 370 * privileges this function loads the module. If module loading is not 371 * available in this kernel then it becomes a nop. 372 */ 373 374 void dev_load(struct net *net, const char *name) 375 { 376 struct net_device *dev; 377 int no_module; 378 379 rcu_read_lock(); 380 dev = dev_get_by_name_rcu(net, name); 381 rcu_read_unlock(); 382 383 no_module = !dev; 384 if (no_module && capable(CAP_NET_ADMIN)) 385 no_module = request_module("netdev-%s", name); 386 if (no_module && capable(CAP_SYS_MODULE)) 387 request_module("%s", name); 388 } 389 EXPORT_SYMBOL(dev_load); 390 391 /* 392 * This function handles all "interface"-type I/O control requests. The actual 393 * 'doing' part of this is dev_ifsioc above. 394 */ 395 396 /** 397 * dev_ioctl - network device ioctl 398 * @net: the applicable net namespace 399 * @cmd: command to issue 400 * @arg: pointer to a struct ifreq in user space 401 * 402 * Issue ioctl functions to devices. This is normally called by the 403 * user space syscall interfaces but can sometimes be useful for 404 * other purposes. The return value is the return from the syscall if 405 * positive or a negative errno code on error. 406 */ 407 408 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) 409 { 410 struct ifreq ifr; 411 int ret; 412 char *colon; 413 414 /* One special case: SIOCGIFCONF takes ifconf argument 415 and requires shared lock, because it sleeps writing 416 to user space. 417 */ 418 419 if (cmd == SIOCGIFCONF) { 420 rtnl_lock(); 421 ret = dev_ifconf(net, (char __user *) arg); 422 rtnl_unlock(); 423 return ret; 424 } 425 if (cmd == SIOCGIFNAME) 426 return dev_ifname(net, (struct ifreq __user *)arg); 427 428 /* 429 * Take care of Wireless Extensions. Unfortunately struct iwreq 430 * isn't a proper subset of struct ifreq (it's 8 byte shorter) 431 * so we need to treat it specially, otherwise applications may 432 * fault if the struct they're passing happens to land at the 433 * end of a mapped page. 434 */ 435 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 436 struct iwreq iwr; 437 438 if (copy_from_user(&iwr, arg, sizeof(iwr))) 439 return -EFAULT; 440 441 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0; 442 443 return wext_handle_ioctl(net, &iwr, cmd, arg); 444 } 445 446 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 447 return -EFAULT; 448 449 ifr.ifr_name[IFNAMSIZ-1] = 0; 450 451 colon = strchr(ifr.ifr_name, ':'); 452 if (colon) 453 *colon = 0; 454 455 /* 456 * See which interface the caller is talking about. 457 */ 458 459 switch (cmd) { 460 /* 461 * These ioctl calls: 462 * - can be done by all. 463 * - atomic and do not require locking. 464 * - return a value 465 */ 466 case SIOCGIFFLAGS: 467 case SIOCGIFMETRIC: 468 case SIOCGIFMTU: 469 case SIOCGIFHWADDR: 470 case SIOCGIFSLAVE: 471 case SIOCGIFMAP: 472 case SIOCGIFINDEX: 473 case SIOCGIFTXQLEN: 474 dev_load(net, ifr.ifr_name); 475 rcu_read_lock(); 476 ret = dev_ifsioc_locked(net, &ifr, cmd); 477 rcu_read_unlock(); 478 if (!ret) { 479 if (colon) 480 *colon = ':'; 481 if (copy_to_user(arg, &ifr, 482 sizeof(struct ifreq))) 483 ret = -EFAULT; 484 } 485 return ret; 486 487 case SIOCETHTOOL: 488 dev_load(net, ifr.ifr_name); 489 rtnl_lock(); 490 ret = dev_ethtool(net, &ifr); 491 rtnl_unlock(); 492 if (!ret) { 493 if (colon) 494 *colon = ':'; 495 if (copy_to_user(arg, &ifr, 496 sizeof(struct ifreq))) 497 ret = -EFAULT; 498 } 499 return ret; 500 501 /* 502 * These ioctl calls: 503 * - require superuser power. 504 * - require strict serialization. 505 * - return a value 506 */ 507 case SIOCGMIIPHY: 508 case SIOCGMIIREG: 509 case SIOCSIFNAME: 510 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 511 return -EPERM; 512 dev_load(net, ifr.ifr_name); 513 rtnl_lock(); 514 ret = dev_ifsioc(net, &ifr, cmd); 515 rtnl_unlock(); 516 if (!ret) { 517 if (colon) 518 *colon = ':'; 519 if (copy_to_user(arg, &ifr, 520 sizeof(struct ifreq))) 521 ret = -EFAULT; 522 } 523 return ret; 524 525 /* 526 * These ioctl calls: 527 * - require superuser power. 528 * - require strict serialization. 529 * - do not return a value 530 */ 531 case SIOCSIFMAP: 532 case SIOCSIFTXQLEN: 533 if (!capable(CAP_NET_ADMIN)) 534 return -EPERM; 535 /* fall through */ 536 /* 537 * These ioctl calls: 538 * - require local superuser power. 539 * - require strict serialization. 540 * - do not return a value 541 */ 542 case SIOCSIFFLAGS: 543 case SIOCSIFMETRIC: 544 case SIOCSIFMTU: 545 case SIOCSIFHWADDR: 546 case SIOCSIFSLAVE: 547 case SIOCADDMULTI: 548 case SIOCDELMULTI: 549 case SIOCSIFHWBROADCAST: 550 case SIOCSMIIREG: 551 case SIOCBONDENSLAVE: 552 case SIOCBONDRELEASE: 553 case SIOCBONDSETHWADDR: 554 case SIOCBONDCHANGEACTIVE: 555 case SIOCBRADDIF: 556 case SIOCBRDELIF: 557 case SIOCSHWTSTAMP: 558 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 559 return -EPERM; 560 /* fall through */ 561 case SIOCBONDSLAVEINFOQUERY: 562 case SIOCBONDINFOQUERY: 563 dev_load(net, ifr.ifr_name); 564 rtnl_lock(); 565 ret = dev_ifsioc(net, &ifr, cmd); 566 rtnl_unlock(); 567 return ret; 568 569 case SIOCGIFMEM: 570 /* Get the per device memory space. We can add this but 571 * currently do not support it */ 572 case SIOCSIFMEM: 573 /* Set the per device memory buffer space. 574 * Not applicable in our case */ 575 case SIOCSIFLINK: 576 return -ENOTTY; 577 578 /* 579 * Unknown or private ioctl. 580 */ 581 default: 582 if (cmd == SIOCWANDEV || 583 cmd == SIOCGHWTSTAMP || 584 (cmd >= SIOCDEVPRIVATE && 585 cmd <= SIOCDEVPRIVATE + 15)) { 586 dev_load(net, ifr.ifr_name); 587 rtnl_lock(); 588 ret = dev_ifsioc(net, &ifr, cmd); 589 rtnl_unlock(); 590 if (!ret && copy_to_user(arg, &ifr, 591 sizeof(struct ifreq))) 592 ret = -EFAULT; 593 return ret; 594 } 595 return -ENOTTY; 596 } 597 } 598