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); 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); 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 if (dev->tx_queue_len ^ ifr->ifr_qlen) { 288 err = dev_change_tx_queue_len(dev, ifr->ifr_qlen); 289 if (err) 290 return err; 291 } 292 return 0; 293 294 case SIOCSIFNAME: 295 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 296 return dev_change_name(dev, ifr->ifr_newname); 297 298 case SIOCSHWTSTAMP: 299 err = net_hwtstamp_validate(ifr); 300 if (err) 301 return err; 302 /* fall through */ 303 304 /* 305 * Unknown or private ioctl 306 */ 307 default: 308 if ((cmd >= SIOCDEVPRIVATE && 309 cmd <= SIOCDEVPRIVATE + 15) || 310 cmd == SIOCBONDENSLAVE || 311 cmd == SIOCBONDRELEASE || 312 cmd == SIOCBONDSETHWADDR || 313 cmd == SIOCBONDSLAVEINFOQUERY || 314 cmd == SIOCBONDINFOQUERY || 315 cmd == SIOCBONDCHANGEACTIVE || 316 cmd == SIOCGMIIPHY || 317 cmd == SIOCGMIIREG || 318 cmd == SIOCSMIIREG || 319 cmd == SIOCBRADDIF || 320 cmd == SIOCBRDELIF || 321 cmd == SIOCSHWTSTAMP || 322 cmd == SIOCGHWTSTAMP || 323 cmd == SIOCWANDEV) { 324 err = -EOPNOTSUPP; 325 if (ops->ndo_do_ioctl) { 326 if (netif_device_present(dev)) 327 err = ops->ndo_do_ioctl(dev, ifr, cmd); 328 else 329 err = -ENODEV; 330 } 331 } else 332 err = -EINVAL; 333 334 } 335 return err; 336 } 337 338 /** 339 * dev_load - load a network module 340 * @net: the applicable net namespace 341 * @name: name of interface 342 * 343 * If a network interface is not present and the process has suitable 344 * privileges this function loads the module. If module loading is not 345 * available in this kernel then it becomes a nop. 346 */ 347 348 void dev_load(struct net *net, const char *name) 349 { 350 struct net_device *dev; 351 int no_module; 352 353 rcu_read_lock(); 354 dev = dev_get_by_name_rcu(net, name); 355 rcu_read_unlock(); 356 357 no_module = !dev; 358 if (no_module && capable(CAP_NET_ADMIN)) 359 no_module = request_module("netdev-%s", name); 360 if (no_module && capable(CAP_SYS_MODULE)) 361 request_module("%s", name); 362 } 363 EXPORT_SYMBOL(dev_load); 364 365 /* 366 * This function handles all "interface"-type I/O control requests. The actual 367 * 'doing' part of this is dev_ifsioc above. 368 */ 369 370 /** 371 * dev_ioctl - network device ioctl 372 * @net: the applicable net namespace 373 * @cmd: command to issue 374 * @arg: pointer to a struct ifreq in user space 375 * 376 * Issue ioctl functions to devices. This is normally called by the 377 * user space syscall interfaces but can sometimes be useful for 378 * other purposes. The return value is the return from the syscall if 379 * positive or a negative errno code on error. 380 */ 381 382 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout) 383 { 384 int ret; 385 char *colon; 386 387 if (need_copyout) 388 *need_copyout = true; 389 if (cmd == SIOCGIFNAME) 390 return dev_ifname(net, ifr); 391 392 ifr->ifr_name[IFNAMSIZ-1] = 0; 393 394 colon = strchr(ifr->ifr_name, ':'); 395 if (colon) 396 *colon = 0; 397 398 /* 399 * See which interface the caller is talking about. 400 */ 401 402 switch (cmd) { 403 /* 404 * These ioctl calls: 405 * - can be done by all. 406 * - atomic and do not require locking. 407 * - return a value 408 */ 409 case SIOCGIFFLAGS: 410 case SIOCGIFMETRIC: 411 case SIOCGIFMTU: 412 case SIOCGIFHWADDR: 413 case SIOCGIFSLAVE: 414 case SIOCGIFMAP: 415 case SIOCGIFINDEX: 416 case SIOCGIFTXQLEN: 417 dev_load(net, ifr->ifr_name); 418 rcu_read_lock(); 419 ret = dev_ifsioc_locked(net, ifr, cmd); 420 rcu_read_unlock(); 421 if (colon) 422 *colon = ':'; 423 return ret; 424 425 case SIOCETHTOOL: 426 dev_load(net, ifr->ifr_name); 427 rtnl_lock(); 428 ret = dev_ethtool(net, ifr); 429 rtnl_unlock(); 430 if (colon) 431 *colon = ':'; 432 return ret; 433 434 /* 435 * These ioctl calls: 436 * - require superuser power. 437 * - require strict serialization. 438 * - return a value 439 */ 440 case SIOCGMIIPHY: 441 case SIOCGMIIREG: 442 case SIOCSIFNAME: 443 dev_load(net, ifr->ifr_name); 444 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 445 return -EPERM; 446 rtnl_lock(); 447 ret = dev_ifsioc(net, ifr, cmd); 448 rtnl_unlock(); 449 if (colon) 450 *colon = ':'; 451 return ret; 452 453 /* 454 * These ioctl calls: 455 * - require superuser power. 456 * - require strict serialization. 457 * - do not return a value 458 */ 459 case SIOCSIFMAP: 460 case SIOCSIFTXQLEN: 461 if (!capable(CAP_NET_ADMIN)) 462 return -EPERM; 463 /* fall through */ 464 /* 465 * These ioctl calls: 466 * - require local superuser power. 467 * - require strict serialization. 468 * - do not return a value 469 */ 470 case SIOCSIFFLAGS: 471 case SIOCSIFMETRIC: 472 case SIOCSIFMTU: 473 case SIOCSIFHWADDR: 474 case SIOCSIFSLAVE: 475 case SIOCADDMULTI: 476 case SIOCDELMULTI: 477 case SIOCSIFHWBROADCAST: 478 case SIOCSMIIREG: 479 case SIOCBONDENSLAVE: 480 case SIOCBONDRELEASE: 481 case SIOCBONDSETHWADDR: 482 case SIOCBONDCHANGEACTIVE: 483 case SIOCBRADDIF: 484 case SIOCBRDELIF: 485 case SIOCSHWTSTAMP: 486 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 487 return -EPERM; 488 /* fall through */ 489 case SIOCBONDSLAVEINFOQUERY: 490 case SIOCBONDINFOQUERY: 491 dev_load(net, ifr->ifr_name); 492 rtnl_lock(); 493 ret = dev_ifsioc(net, ifr, cmd); 494 rtnl_unlock(); 495 if (need_copyout) 496 *need_copyout = false; 497 return ret; 498 499 case SIOCGIFMEM: 500 /* Get the per device memory space. We can add this but 501 * currently do not support it */ 502 case SIOCSIFMEM: 503 /* Set the per device memory buffer space. 504 * Not applicable in our case */ 505 case SIOCSIFLINK: 506 return -ENOTTY; 507 508 /* 509 * Unknown or private ioctl. 510 */ 511 default: 512 if (cmd == SIOCWANDEV || 513 cmd == SIOCGHWTSTAMP || 514 (cmd >= SIOCDEVPRIVATE && 515 cmd <= SIOCDEVPRIVATE + 15)) { 516 dev_load(net, ifr->ifr_name); 517 rtnl_lock(); 518 ret = dev_ifsioc(net, ifr, cmd); 519 rtnl_unlock(); 520 return ret; 521 } 522 return -ENOTTY; 523 } 524 } 525