1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kmod.h> 3 #include <linux/netdevice.h> 4 #include <linux/etherdevice.h> 5 #include <linux/rtnetlink.h> 6 #include <linux/net_tstamp.h> 7 #include <linux/wireless.h> 8 #include <net/wext.h> 9 10 /* 11 * Map an interface index to its name (SIOCGIFNAME) 12 */ 13 14 /* 15 * We need this ioctl for efficient implementation of the 16 * if_indextoname() function required by the IPv6 API. Without 17 * it, we would have to search all the interfaces to find a 18 * match. --pb 19 */ 20 21 static int dev_ifname(struct net *net, struct ifreq *ifr) 22 { 23 ifr->ifr_name[IFNAMSIZ-1] = 0; 24 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); 25 } 26 27 static gifconf_func_t *gifconf_list[NPROTO]; 28 29 /** 30 * register_gifconf - register a SIOCGIF handler 31 * @family: Address family 32 * @gifconf: Function handler 33 * 34 * Register protocol dependent address dumping routines. The handler 35 * that is passed must not be freed or reused until it has been replaced 36 * by another handler. 37 */ 38 int register_gifconf(unsigned int family, gifconf_func_t *gifconf) 39 { 40 if (family >= NPROTO) 41 return -EINVAL; 42 gifconf_list[family] = gifconf; 43 return 0; 44 } 45 EXPORT_SYMBOL(register_gifconf); 46 47 /* 48 * Perform a SIOCGIFCONF call. This structure will change 49 * size eventually, and there is nothing I can do about it. 50 * Thus we will need a 'compatibility mode'. 51 */ 52 53 int dev_ifconf(struct net *net, struct ifconf *ifc, int size) 54 { 55 struct net_device *dev; 56 char __user *pos; 57 int len; 58 int total; 59 int i; 60 61 /* 62 * Fetch the caller's info block. 63 */ 64 65 pos = ifc->ifc_buf; 66 len = ifc->ifc_len; 67 68 /* 69 * Loop over the interfaces, and write an info block for each. 70 */ 71 72 total = 0; 73 for_each_netdev(net, dev) { 74 for (i = 0; i < NPROTO; i++) { 75 if (gifconf_list[i]) { 76 int done; 77 if (!pos) 78 done = gifconf_list[i](dev, NULL, 0, size); 79 else 80 done = gifconf_list[i](dev, pos + total, 81 len - total, size); 82 if (done < 0) 83 return -EFAULT; 84 total += done; 85 } 86 } 87 } 88 89 /* 90 * All done. Write the updated control block back to the caller. 91 */ 92 ifc->ifc_len = total; 93 94 /* 95 * Both BSD and Solaris return 0 here, so we do too. 96 */ 97 return 0; 98 } 99 100 /* 101 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 102 */ 103 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 104 { 105 int err; 106 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 107 108 if (!dev) 109 return -ENODEV; 110 111 switch (cmd) { 112 case SIOCGIFFLAGS: /* Get interface flags */ 113 ifr->ifr_flags = (short) dev_get_flags(dev); 114 return 0; 115 116 case SIOCGIFMETRIC: /* Get the metric on the interface 117 (currently unused) */ 118 ifr->ifr_metric = 0; 119 return 0; 120 121 case SIOCGIFMTU: /* Get the MTU of a device */ 122 ifr->ifr_mtu = dev->mtu; 123 return 0; 124 125 case SIOCGIFHWADDR: 126 if (!dev->addr_len) 127 memset(ifr->ifr_hwaddr.sa_data, 0, 128 sizeof(ifr->ifr_hwaddr.sa_data)); 129 else 130 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, 131 min(sizeof(ifr->ifr_hwaddr.sa_data), 132 (size_t)dev->addr_len)); 133 ifr->ifr_hwaddr.sa_family = dev->type; 134 return 0; 135 136 case SIOCGIFSLAVE: 137 err = -EINVAL; 138 break; 139 140 case SIOCGIFMAP: 141 ifr->ifr_map.mem_start = dev->mem_start; 142 ifr->ifr_map.mem_end = dev->mem_end; 143 ifr->ifr_map.base_addr = dev->base_addr; 144 ifr->ifr_map.irq = dev->irq; 145 ifr->ifr_map.dma = dev->dma; 146 ifr->ifr_map.port = dev->if_port; 147 return 0; 148 149 case SIOCGIFINDEX: 150 ifr->ifr_ifindex = dev->ifindex; 151 return 0; 152 153 case SIOCGIFTXQLEN: 154 ifr->ifr_qlen = dev->tx_queue_len; 155 return 0; 156 157 default: 158 /* dev_ioctl() should ensure this case 159 * is never reached 160 */ 161 WARN_ON(1); 162 err = -ENOTTY; 163 break; 164 165 } 166 return err; 167 } 168 169 static int net_hwtstamp_validate(struct ifreq *ifr) 170 { 171 struct hwtstamp_config cfg; 172 enum hwtstamp_tx_types tx_type; 173 enum hwtstamp_rx_filters rx_filter; 174 int tx_type_valid = 0; 175 int rx_filter_valid = 0; 176 177 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 178 return -EFAULT; 179 180 if (cfg.flags) /* reserved for future extensions */ 181 return -EINVAL; 182 183 tx_type = cfg.tx_type; 184 rx_filter = cfg.rx_filter; 185 186 switch (tx_type) { 187 case HWTSTAMP_TX_OFF: 188 case HWTSTAMP_TX_ON: 189 case HWTSTAMP_TX_ONESTEP_SYNC: 190 case HWTSTAMP_TX_ONESTEP_P2P: 191 tx_type_valid = 1; 192 break; 193 case __HWTSTAMP_TX_CNT: 194 /* not a real value */ 195 break; 196 } 197 198 switch (rx_filter) { 199 case HWTSTAMP_FILTER_NONE: 200 case HWTSTAMP_FILTER_ALL: 201 case HWTSTAMP_FILTER_SOME: 202 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 203 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 204 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 205 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 206 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 207 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 208 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 209 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 210 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 211 case HWTSTAMP_FILTER_PTP_V2_EVENT: 212 case HWTSTAMP_FILTER_PTP_V2_SYNC: 213 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 214 case HWTSTAMP_FILTER_NTP_ALL: 215 rx_filter_valid = 1; 216 break; 217 case __HWTSTAMP_FILTER_CNT: 218 /* not a real value */ 219 break; 220 } 221 222 if (!tx_type_valid || !rx_filter_valid) 223 return -ERANGE; 224 225 return 0; 226 } 227 228 /* 229 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 230 */ 231 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) 232 { 233 int err; 234 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 235 const struct net_device_ops *ops; 236 237 if (!dev) 238 return -ENODEV; 239 240 ops = dev->netdev_ops; 241 242 switch (cmd) { 243 case SIOCSIFFLAGS: /* Set interface flags */ 244 return dev_change_flags(dev, ifr->ifr_flags, NULL); 245 246 case SIOCSIFMETRIC: /* Set the metric on the interface 247 (currently unused) */ 248 return -EOPNOTSUPP; 249 250 case SIOCSIFMTU: /* Set the MTU of a device */ 251 return dev_set_mtu(dev, ifr->ifr_mtu); 252 253 case SIOCSIFHWADDR: 254 if (dev->addr_len > sizeof(struct sockaddr)) 255 return -EINVAL; 256 return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL); 257 258 case SIOCSIFHWBROADCAST: 259 if (ifr->ifr_hwaddr.sa_family != dev->type) 260 return -EINVAL; 261 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 262 min(sizeof(ifr->ifr_hwaddr.sa_data), 263 (size_t)dev->addr_len)); 264 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 265 return 0; 266 267 case SIOCSIFMAP: 268 if (ops->ndo_set_config) { 269 if (!netif_device_present(dev)) 270 return -ENODEV; 271 return ops->ndo_set_config(dev, &ifr->ifr_map); 272 } 273 return -EOPNOTSUPP; 274 275 case SIOCADDMULTI: 276 if (!ops->ndo_set_rx_mode || 277 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 278 return -EINVAL; 279 if (!netif_device_present(dev)) 280 return -ENODEV; 281 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 282 283 case SIOCDELMULTI: 284 if (!ops->ndo_set_rx_mode || 285 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 286 return -EINVAL; 287 if (!netif_device_present(dev)) 288 return -ENODEV; 289 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 290 291 case SIOCSIFTXQLEN: 292 if (ifr->ifr_qlen < 0) 293 return -EINVAL; 294 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 295 296 case SIOCSIFNAME: 297 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 298 return dev_change_name(dev, ifr->ifr_newname); 299 300 case SIOCSHWTSTAMP: 301 err = net_hwtstamp_validate(ifr); 302 if (err) 303 return err; 304 /* fall through */ 305 306 /* 307 * Unknown or private ioctl 308 */ 309 default: 310 if ((cmd >= SIOCDEVPRIVATE && 311 cmd <= SIOCDEVPRIVATE + 15) || 312 cmd == SIOCBONDENSLAVE || 313 cmd == SIOCBONDRELEASE || 314 cmd == SIOCBONDSETHWADDR || 315 cmd == SIOCBONDSLAVEINFOQUERY || 316 cmd == SIOCBONDINFOQUERY || 317 cmd == SIOCBONDCHANGEACTIVE || 318 cmd == SIOCGMIIPHY || 319 cmd == SIOCGMIIREG || 320 cmd == SIOCSMIIREG || 321 cmd == SIOCBRADDIF || 322 cmd == SIOCBRDELIF || 323 cmd == SIOCSHWTSTAMP || 324 cmd == SIOCGHWTSTAMP || 325 cmd == SIOCWANDEV) { 326 err = -EOPNOTSUPP; 327 if (ops->ndo_do_ioctl) { 328 if (netif_device_present(dev)) 329 err = ops->ndo_do_ioctl(dev, ifr, cmd); 330 else 331 err = -ENODEV; 332 } 333 } else 334 err = -EINVAL; 335 336 } 337 return err; 338 } 339 340 /** 341 * dev_load - load a network module 342 * @net: the applicable net namespace 343 * @name: name of interface 344 * 345 * If a network interface is not present and the process has suitable 346 * privileges this function loads the module. If module loading is not 347 * available in this kernel then it becomes a nop. 348 */ 349 350 void dev_load(struct net *net, const char *name) 351 { 352 struct net_device *dev; 353 int no_module; 354 355 rcu_read_lock(); 356 dev = dev_get_by_name_rcu(net, name); 357 rcu_read_unlock(); 358 359 no_module = !dev; 360 if (no_module && capable(CAP_NET_ADMIN)) 361 no_module = request_module("netdev-%s", name); 362 if (no_module && capable(CAP_SYS_MODULE)) 363 request_module("%s", name); 364 } 365 EXPORT_SYMBOL(dev_load); 366 367 /* 368 * This function handles all "interface"-type I/O control requests. The actual 369 * 'doing' part of this is dev_ifsioc above. 370 */ 371 372 /** 373 * dev_ioctl - network device ioctl 374 * @net: the applicable net namespace 375 * @cmd: command to issue 376 * @ifr: pointer to a struct ifreq in user space 377 * @need_copyout: whether or not copy_to_user() should be called 378 * 379 * Issue ioctl functions to devices. This is normally called by the 380 * user space syscall interfaces but can sometimes be useful for 381 * other purposes. The return value is the return from the syscall if 382 * positive or a negative errno code on error. 383 */ 384 385 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout) 386 { 387 int ret; 388 char *colon; 389 390 if (need_copyout) 391 *need_copyout = true; 392 if (cmd == SIOCGIFNAME) 393 return dev_ifname(net, ifr); 394 395 ifr->ifr_name[IFNAMSIZ-1] = 0; 396 397 colon = strchr(ifr->ifr_name, ':'); 398 if (colon) 399 *colon = 0; 400 401 /* 402 * See which interface the caller is talking about. 403 */ 404 405 switch (cmd) { 406 /* 407 * These ioctl calls: 408 * - can be done by all. 409 * - atomic and do not require locking. 410 * - return a value 411 */ 412 case SIOCGIFFLAGS: 413 case SIOCGIFMETRIC: 414 case SIOCGIFMTU: 415 case SIOCGIFHWADDR: 416 case SIOCGIFSLAVE: 417 case SIOCGIFMAP: 418 case SIOCGIFINDEX: 419 case SIOCGIFTXQLEN: 420 dev_load(net, ifr->ifr_name); 421 rcu_read_lock(); 422 ret = dev_ifsioc_locked(net, ifr, cmd); 423 rcu_read_unlock(); 424 if (colon) 425 *colon = ':'; 426 return ret; 427 428 case SIOCETHTOOL: 429 dev_load(net, ifr->ifr_name); 430 rtnl_lock(); 431 ret = dev_ethtool(net, ifr); 432 rtnl_unlock(); 433 if (colon) 434 *colon = ':'; 435 return ret; 436 437 /* 438 * These ioctl calls: 439 * - require superuser power. 440 * - require strict serialization. 441 * - return a value 442 */ 443 case SIOCGMIIPHY: 444 case SIOCGMIIREG: 445 case SIOCSIFNAME: 446 dev_load(net, ifr->ifr_name); 447 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 448 return -EPERM; 449 rtnl_lock(); 450 ret = dev_ifsioc(net, ifr, cmd); 451 rtnl_unlock(); 452 if (colon) 453 *colon = ':'; 454 return ret; 455 456 /* 457 * These ioctl calls: 458 * - require superuser power. 459 * - require strict serialization. 460 * - do not return a value 461 */ 462 case SIOCSIFMAP: 463 case SIOCSIFTXQLEN: 464 if (!capable(CAP_NET_ADMIN)) 465 return -EPERM; 466 /* fall through */ 467 /* 468 * These ioctl calls: 469 * - require local superuser power. 470 * - require strict serialization. 471 * - do not return a value 472 */ 473 case SIOCSIFFLAGS: 474 case SIOCSIFMETRIC: 475 case SIOCSIFMTU: 476 case SIOCSIFHWADDR: 477 case SIOCSIFSLAVE: 478 case SIOCADDMULTI: 479 case SIOCDELMULTI: 480 case SIOCSIFHWBROADCAST: 481 case SIOCSMIIREG: 482 case SIOCBONDENSLAVE: 483 case SIOCBONDRELEASE: 484 case SIOCBONDSETHWADDR: 485 case SIOCBONDCHANGEACTIVE: 486 case SIOCBRADDIF: 487 case SIOCBRDELIF: 488 case SIOCSHWTSTAMP: 489 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 490 return -EPERM; 491 /* fall through */ 492 case SIOCBONDSLAVEINFOQUERY: 493 case SIOCBONDINFOQUERY: 494 dev_load(net, ifr->ifr_name); 495 rtnl_lock(); 496 ret = dev_ifsioc(net, ifr, cmd); 497 rtnl_unlock(); 498 if (need_copyout) 499 *need_copyout = false; 500 return ret; 501 502 case SIOCGIFMEM: 503 /* Get the per device memory space. We can add this but 504 * currently do not support it */ 505 case SIOCSIFMEM: 506 /* Set the per device memory buffer space. 507 * Not applicable in our case */ 508 case SIOCSIFLINK: 509 return -ENOTTY; 510 511 /* 512 * Unknown or private ioctl. 513 */ 514 default: 515 if (cmd == SIOCWANDEV || 516 cmd == SIOCGHWTSTAMP || 517 (cmd >= SIOCDEVPRIVATE && 518 cmd <= SIOCDEVPRIVATE + 15)) { 519 dev_load(net, ifr->ifr_name); 520 rtnl_lock(); 521 ret = dev_ifsioc(net, ifr, cmd); 522 rtnl_unlock(); 523 return ret; 524 } 525 return -ENOTTY; 526 } 527 } 528