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