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 dev->tx_queue_len = ifr->ifr_qlen; 307 return 0; 308 309 case SIOCSIFNAME: 310 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 311 return dev_change_name(dev, ifr->ifr_newname); 312 313 case SIOCSHWTSTAMP: 314 err = net_hwtstamp_validate(ifr); 315 if (err) 316 return err; 317 /* fall through */ 318 319 /* 320 * Unknown or private ioctl 321 */ 322 default: 323 if ((cmd >= SIOCDEVPRIVATE && 324 cmd <= SIOCDEVPRIVATE + 15) || 325 cmd == SIOCBONDENSLAVE || 326 cmd == SIOCBONDRELEASE || 327 cmd == SIOCBONDSETHWADDR || 328 cmd == SIOCBONDSLAVEINFOQUERY || 329 cmd == SIOCBONDINFOQUERY || 330 cmd == SIOCBONDCHANGEACTIVE || 331 cmd == SIOCGMIIPHY || 332 cmd == SIOCGMIIREG || 333 cmd == SIOCSMIIREG || 334 cmd == SIOCBRADDIF || 335 cmd == SIOCBRDELIF || 336 cmd == SIOCSHWTSTAMP || 337 cmd == SIOCGHWTSTAMP || 338 cmd == SIOCWANDEV) { 339 err = -EOPNOTSUPP; 340 if (ops->ndo_do_ioctl) { 341 if (netif_device_present(dev)) 342 err = ops->ndo_do_ioctl(dev, ifr, cmd); 343 else 344 err = -ENODEV; 345 } 346 } else 347 err = -EINVAL; 348 349 } 350 return err; 351 } 352 353 /** 354 * dev_load - load a network module 355 * @net: the applicable net namespace 356 * @name: name of interface 357 * 358 * If a network interface is not present and the process has suitable 359 * privileges this function loads the module. If module loading is not 360 * available in this kernel then it becomes a nop. 361 */ 362 363 void dev_load(struct net *net, const char *name) 364 { 365 struct net_device *dev; 366 int no_module; 367 368 rcu_read_lock(); 369 dev = dev_get_by_name_rcu(net, name); 370 rcu_read_unlock(); 371 372 no_module = !dev; 373 if (no_module && capable(CAP_NET_ADMIN)) 374 no_module = request_module("netdev-%s", name); 375 if (no_module && capable(CAP_SYS_MODULE)) 376 request_module("%s", name); 377 } 378 EXPORT_SYMBOL(dev_load); 379 380 /* 381 * This function handles all "interface"-type I/O control requests. The actual 382 * 'doing' part of this is dev_ifsioc above. 383 */ 384 385 /** 386 * dev_ioctl - network device ioctl 387 * @net: the applicable net namespace 388 * @cmd: command to issue 389 * @arg: pointer to a struct ifreq in user space 390 * 391 * Issue ioctl functions to devices. This is normally called by the 392 * user space syscall interfaces but can sometimes be useful for 393 * other purposes. The return value is the return from the syscall if 394 * positive or a negative errno code on error. 395 */ 396 397 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) 398 { 399 struct ifreq ifr; 400 int ret; 401 char *colon; 402 403 /* One special case: SIOCGIFCONF takes ifconf argument 404 and requires shared lock, because it sleeps writing 405 to user space. 406 */ 407 408 if (cmd == SIOCGIFCONF) { 409 rtnl_lock(); 410 ret = dev_ifconf(net, (char __user *) arg); 411 rtnl_unlock(); 412 return ret; 413 } 414 if (cmd == SIOCGIFNAME) 415 return dev_ifname(net, (struct ifreq __user *)arg); 416 417 /* 418 * Take care of Wireless Extensions. Unfortunately struct iwreq 419 * isn't a proper subset of struct ifreq (it's 8 byte shorter) 420 * so we need to treat it specially, otherwise applications may 421 * fault if the struct they're passing happens to land at the 422 * end of a mapped page. 423 */ 424 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 425 struct iwreq iwr; 426 427 if (copy_from_user(&iwr, arg, sizeof(iwr))) 428 return -EFAULT; 429 430 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0; 431 432 return wext_handle_ioctl(net, &iwr, cmd, arg); 433 } 434 435 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 436 return -EFAULT; 437 438 ifr.ifr_name[IFNAMSIZ-1] = 0; 439 440 colon = strchr(ifr.ifr_name, ':'); 441 if (colon) 442 *colon = 0; 443 444 /* 445 * See which interface the caller is talking about. 446 */ 447 448 switch (cmd) { 449 /* 450 * These ioctl calls: 451 * - can be done by all. 452 * - atomic and do not require locking. 453 * - return a value 454 */ 455 case SIOCGIFFLAGS: 456 case SIOCGIFMETRIC: 457 case SIOCGIFMTU: 458 case SIOCGIFHWADDR: 459 case SIOCGIFSLAVE: 460 case SIOCGIFMAP: 461 case SIOCGIFINDEX: 462 case SIOCGIFTXQLEN: 463 dev_load(net, ifr.ifr_name); 464 rcu_read_lock(); 465 ret = dev_ifsioc_locked(net, &ifr, cmd); 466 rcu_read_unlock(); 467 if (!ret) { 468 if (colon) 469 *colon = ':'; 470 if (copy_to_user(arg, &ifr, 471 sizeof(struct ifreq))) 472 ret = -EFAULT; 473 } 474 return ret; 475 476 case SIOCETHTOOL: 477 dev_load(net, ifr.ifr_name); 478 rtnl_lock(); 479 ret = dev_ethtool(net, &ifr); 480 rtnl_unlock(); 481 if (!ret) { 482 if (colon) 483 *colon = ':'; 484 if (copy_to_user(arg, &ifr, 485 sizeof(struct ifreq))) 486 ret = -EFAULT; 487 } 488 return ret; 489 490 /* 491 * These ioctl calls: 492 * - require superuser power. 493 * - require strict serialization. 494 * - return a value 495 */ 496 case SIOCGMIIPHY: 497 case SIOCGMIIREG: 498 case SIOCSIFNAME: 499 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 500 return -EPERM; 501 dev_load(net, ifr.ifr_name); 502 rtnl_lock(); 503 ret = dev_ifsioc(net, &ifr, cmd); 504 rtnl_unlock(); 505 if (!ret) { 506 if (colon) 507 *colon = ':'; 508 if (copy_to_user(arg, &ifr, 509 sizeof(struct ifreq))) 510 ret = -EFAULT; 511 } 512 return ret; 513 514 /* 515 * These ioctl calls: 516 * - require superuser power. 517 * - require strict serialization. 518 * - do not return a value 519 */ 520 case SIOCSIFMAP: 521 case SIOCSIFTXQLEN: 522 if (!capable(CAP_NET_ADMIN)) 523 return -EPERM; 524 /* fall through */ 525 /* 526 * These ioctl calls: 527 * - require local superuser power. 528 * - require strict serialization. 529 * - do not return a value 530 */ 531 case SIOCSIFFLAGS: 532 case SIOCSIFMETRIC: 533 case SIOCSIFMTU: 534 case SIOCSIFHWADDR: 535 case SIOCSIFSLAVE: 536 case SIOCADDMULTI: 537 case SIOCDELMULTI: 538 case SIOCSIFHWBROADCAST: 539 case SIOCSMIIREG: 540 case SIOCBONDENSLAVE: 541 case SIOCBONDRELEASE: 542 case SIOCBONDSETHWADDR: 543 case SIOCBONDCHANGEACTIVE: 544 case SIOCBRADDIF: 545 case SIOCBRDELIF: 546 case SIOCSHWTSTAMP: 547 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 548 return -EPERM; 549 /* fall through */ 550 case SIOCBONDSLAVEINFOQUERY: 551 case SIOCBONDINFOQUERY: 552 dev_load(net, ifr.ifr_name); 553 rtnl_lock(); 554 ret = dev_ifsioc(net, &ifr, cmd); 555 rtnl_unlock(); 556 return ret; 557 558 case SIOCGIFMEM: 559 /* Get the per device memory space. We can add this but 560 * currently do not support it */ 561 case SIOCSIFMEM: 562 /* Set the per device memory buffer space. 563 * Not applicable in our case */ 564 case SIOCSIFLINK: 565 return -ENOTTY; 566 567 /* 568 * Unknown or private ioctl. 569 */ 570 default: 571 if (cmd == SIOCWANDEV || 572 cmd == SIOCGHWTSTAMP || 573 (cmd >= SIOCDEVPRIVATE && 574 cmd <= SIOCDEVPRIVATE + 15)) { 575 dev_load(net, ifr.ifr_name); 576 rtnl_lock(); 577 ret = dev_ifsioc(net, &ifr, cmd); 578 rtnl_unlock(); 579 if (!ret && copy_to_user(arg, &ifr, 580 sizeof(struct ifreq))) 581 ret = -EFAULT; 582 return ret; 583 } 584 return -ENOTTY; 585 } 586 } 587