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 } 194 195 switch (rx_filter) { 196 case HWTSTAMP_FILTER_NONE: 197 case HWTSTAMP_FILTER_ALL: 198 case HWTSTAMP_FILTER_SOME: 199 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 200 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 201 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 202 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 203 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 204 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 205 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 206 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 207 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 208 case HWTSTAMP_FILTER_PTP_V2_EVENT: 209 case HWTSTAMP_FILTER_PTP_V2_SYNC: 210 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 211 case HWTSTAMP_FILTER_NTP_ALL: 212 rx_filter_valid = 1; 213 break; 214 } 215 216 if (!tx_type_valid || !rx_filter_valid) 217 return -ERANGE; 218 219 return 0; 220 } 221 222 /* 223 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 224 */ 225 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) 226 { 227 int err; 228 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 229 const struct net_device_ops *ops; 230 231 if (!dev) 232 return -ENODEV; 233 234 ops = dev->netdev_ops; 235 236 switch (cmd) { 237 case SIOCSIFFLAGS: /* Set interface flags */ 238 return dev_change_flags(dev, ifr->ifr_flags, NULL); 239 240 case SIOCSIFMETRIC: /* Set the metric on the interface 241 (currently unused) */ 242 return -EOPNOTSUPP; 243 244 case SIOCSIFMTU: /* Set the MTU of a device */ 245 return dev_set_mtu(dev, ifr->ifr_mtu); 246 247 case SIOCSIFHWADDR: 248 if (dev->addr_len > sizeof(struct sockaddr)) 249 return -EINVAL; 250 return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL); 251 252 case SIOCSIFHWBROADCAST: 253 if (ifr->ifr_hwaddr.sa_family != dev->type) 254 return -EINVAL; 255 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 256 min(sizeof(ifr->ifr_hwaddr.sa_data), 257 (size_t)dev->addr_len)); 258 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 259 return 0; 260 261 case SIOCSIFMAP: 262 if (ops->ndo_set_config) { 263 if (!netif_device_present(dev)) 264 return -ENODEV; 265 return ops->ndo_set_config(dev, &ifr->ifr_map); 266 } 267 return -EOPNOTSUPP; 268 269 case SIOCADDMULTI: 270 if (!ops->ndo_set_rx_mode || 271 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 272 return -EINVAL; 273 if (!netif_device_present(dev)) 274 return -ENODEV; 275 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 276 277 case SIOCDELMULTI: 278 if (!ops->ndo_set_rx_mode || 279 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 280 return -EINVAL; 281 if (!netif_device_present(dev)) 282 return -ENODEV; 283 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 284 285 case SIOCSIFTXQLEN: 286 if (ifr->ifr_qlen < 0) 287 return -EINVAL; 288 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 289 290 case SIOCSIFNAME: 291 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 292 return dev_change_name(dev, ifr->ifr_newname); 293 294 case SIOCSHWTSTAMP: 295 err = net_hwtstamp_validate(ifr); 296 if (err) 297 return err; 298 /* fall through */ 299 300 /* 301 * Unknown or private ioctl 302 */ 303 default: 304 if ((cmd >= SIOCDEVPRIVATE && 305 cmd <= SIOCDEVPRIVATE + 15) || 306 cmd == SIOCBONDENSLAVE || 307 cmd == SIOCBONDRELEASE || 308 cmd == SIOCBONDSETHWADDR || 309 cmd == SIOCBONDSLAVEINFOQUERY || 310 cmd == SIOCBONDINFOQUERY || 311 cmd == SIOCBONDCHANGEACTIVE || 312 cmd == SIOCGMIIPHY || 313 cmd == SIOCGMIIREG || 314 cmd == SIOCSMIIREG || 315 cmd == SIOCBRADDIF || 316 cmd == SIOCBRDELIF || 317 cmd == SIOCSHWTSTAMP || 318 cmd == SIOCGHWTSTAMP || 319 cmd == SIOCWANDEV) { 320 err = -EOPNOTSUPP; 321 if (ops->ndo_do_ioctl) { 322 if (netif_device_present(dev)) 323 err = ops->ndo_do_ioctl(dev, ifr, cmd); 324 else 325 err = -ENODEV; 326 } 327 } else 328 err = -EINVAL; 329 330 } 331 return err; 332 } 333 334 /** 335 * dev_load - load a network module 336 * @net: the applicable net namespace 337 * @name: name of interface 338 * 339 * If a network interface is not present and the process has suitable 340 * privileges this function loads the module. If module loading is not 341 * available in this kernel then it becomes a nop. 342 */ 343 344 void dev_load(struct net *net, const char *name) 345 { 346 struct net_device *dev; 347 int no_module; 348 349 rcu_read_lock(); 350 dev = dev_get_by_name_rcu(net, name); 351 rcu_read_unlock(); 352 353 no_module = !dev; 354 if (no_module && capable(CAP_NET_ADMIN)) 355 no_module = request_module("netdev-%s", name); 356 if (no_module && capable(CAP_SYS_MODULE)) 357 request_module("%s", name); 358 } 359 EXPORT_SYMBOL(dev_load); 360 361 /* 362 * This function handles all "interface"-type I/O control requests. The actual 363 * 'doing' part of this is dev_ifsioc above. 364 */ 365 366 /** 367 * dev_ioctl - network device ioctl 368 * @net: the applicable net namespace 369 * @cmd: command to issue 370 * @ifr: pointer to a struct ifreq in user space 371 * @need_copyout: whether or not copy_to_user() should be called 372 * 373 * Issue ioctl functions to devices. This is normally called by the 374 * user space syscall interfaces but can sometimes be useful for 375 * other purposes. The return value is the return from the syscall if 376 * positive or a negative errno code on error. 377 */ 378 379 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout) 380 { 381 int ret; 382 char *colon; 383 384 if (need_copyout) 385 *need_copyout = true; 386 if (cmd == SIOCGIFNAME) 387 return dev_ifname(net, ifr); 388 389 ifr->ifr_name[IFNAMSIZ-1] = 0; 390 391 colon = strchr(ifr->ifr_name, ':'); 392 if (colon) 393 *colon = 0; 394 395 /* 396 * See which interface the caller is talking about. 397 */ 398 399 switch (cmd) { 400 /* 401 * These ioctl calls: 402 * - can be done by all. 403 * - atomic and do not require locking. 404 * - return a value 405 */ 406 case SIOCGIFFLAGS: 407 case SIOCGIFMETRIC: 408 case SIOCGIFMTU: 409 case SIOCGIFHWADDR: 410 case SIOCGIFSLAVE: 411 case SIOCGIFMAP: 412 case SIOCGIFINDEX: 413 case SIOCGIFTXQLEN: 414 dev_load(net, ifr->ifr_name); 415 rcu_read_lock(); 416 ret = dev_ifsioc_locked(net, ifr, cmd); 417 rcu_read_unlock(); 418 if (colon) 419 *colon = ':'; 420 return ret; 421 422 case SIOCETHTOOL: 423 dev_load(net, ifr->ifr_name); 424 rtnl_lock(); 425 ret = dev_ethtool(net, ifr); 426 rtnl_unlock(); 427 if (colon) 428 *colon = ':'; 429 return ret; 430 431 /* 432 * These ioctl calls: 433 * - require superuser power. 434 * - require strict serialization. 435 * - return a value 436 */ 437 case SIOCGMIIPHY: 438 case SIOCGMIIREG: 439 case SIOCSIFNAME: 440 dev_load(net, ifr->ifr_name); 441 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 442 return -EPERM; 443 rtnl_lock(); 444 ret = dev_ifsioc(net, ifr, cmd); 445 rtnl_unlock(); 446 if (colon) 447 *colon = ':'; 448 return ret; 449 450 /* 451 * These ioctl calls: 452 * - require superuser power. 453 * - require strict serialization. 454 * - do not return a value 455 */ 456 case SIOCSIFMAP: 457 case SIOCSIFTXQLEN: 458 if (!capable(CAP_NET_ADMIN)) 459 return -EPERM; 460 /* fall through */ 461 /* 462 * These ioctl calls: 463 * - require local superuser power. 464 * - require strict serialization. 465 * - do not return a value 466 */ 467 case SIOCSIFFLAGS: 468 case SIOCSIFMETRIC: 469 case SIOCSIFMTU: 470 case SIOCSIFHWADDR: 471 case SIOCSIFSLAVE: 472 case SIOCADDMULTI: 473 case SIOCDELMULTI: 474 case SIOCSIFHWBROADCAST: 475 case SIOCSMIIREG: 476 case SIOCBONDENSLAVE: 477 case SIOCBONDRELEASE: 478 case SIOCBONDSETHWADDR: 479 case SIOCBONDCHANGEACTIVE: 480 case SIOCBRADDIF: 481 case SIOCBRDELIF: 482 case SIOCSHWTSTAMP: 483 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 484 return -EPERM; 485 /* fall through */ 486 case SIOCBONDSLAVEINFOQUERY: 487 case SIOCBONDINFOQUERY: 488 dev_load(net, ifr->ifr_name); 489 rtnl_lock(); 490 ret = dev_ifsioc(net, ifr, cmd); 491 rtnl_unlock(); 492 if (need_copyout) 493 *need_copyout = false; 494 return ret; 495 496 case SIOCGIFMEM: 497 /* Get the per device memory space. We can add this but 498 * currently do not support it */ 499 case SIOCSIFMEM: 500 /* Set the per device memory buffer space. 501 * Not applicable in our case */ 502 case SIOCSIFLINK: 503 return -ENOTTY; 504 505 /* 506 * Unknown or private ioctl. 507 */ 508 default: 509 if (cmd == SIOCWANDEV || 510 cmd == SIOCGHWTSTAMP || 511 (cmd >= SIOCDEVPRIVATE && 512 cmd <= SIOCDEVPRIVATE + 15)) { 513 dev_load(net, ifr->ifr_name); 514 rtnl_lock(); 515 ret = dev_ifsioc(net, ifr, cmd); 516 rtnl_unlock(); 517 return ret; 518 } 519 return -ENOTTY; 520 } 521 } 522