1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kmod.h> 3 #include <linux/netdevice.h> 4 #include <linux/inetdevice.h> 5 #include <linux/etherdevice.h> 6 #include <linux/rtnetlink.h> 7 #include <linux/net_tstamp.h> 8 #include <linux/wireless.h> 9 #include <linux/if_bridge.h> 10 #include <net/dsa_stubs.h> 11 #include <net/wext.h> 12 13 #include "dev.h" 14 15 /* 16 * Map an interface index to its name (SIOCGIFNAME) 17 */ 18 19 /* 20 * We need this ioctl for efficient implementation of the 21 * if_indextoname() function required by the IPv6 API. Without 22 * it, we would have to search all the interfaces to find a 23 * match. --pb 24 */ 25 26 static int dev_ifname(struct net *net, struct ifreq *ifr) 27 { 28 ifr->ifr_name[IFNAMSIZ-1] = 0; 29 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); 30 } 31 32 /* 33 * Perform a SIOCGIFCONF call. This structure will change 34 * size eventually, and there is nothing I can do about it. 35 * Thus we will need a 'compatibility mode'. 36 */ 37 int dev_ifconf(struct net *net, struct ifconf __user *uifc) 38 { 39 struct net_device *dev; 40 void __user *pos; 41 size_t size; 42 int len, total = 0, done; 43 44 /* both the ifconf and the ifreq structures are slightly different */ 45 if (in_compat_syscall()) { 46 struct compat_ifconf ifc32; 47 48 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf))) 49 return -EFAULT; 50 51 pos = compat_ptr(ifc32.ifcbuf); 52 len = ifc32.ifc_len; 53 size = sizeof(struct compat_ifreq); 54 } else { 55 struct ifconf ifc; 56 57 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 58 return -EFAULT; 59 60 pos = ifc.ifc_buf; 61 len = ifc.ifc_len; 62 size = sizeof(struct ifreq); 63 } 64 65 /* Loop over the interfaces, and write an info block for each. */ 66 rtnl_lock(); 67 for_each_netdev(net, dev) { 68 if (!pos) 69 done = inet_gifconf(dev, NULL, 0, size); 70 else 71 done = inet_gifconf(dev, pos + total, 72 len - total, size); 73 if (done < 0) { 74 rtnl_unlock(); 75 return -EFAULT; 76 } 77 total += done; 78 } 79 rtnl_unlock(); 80 81 return put_user(total, &uifc->ifc_len); 82 } 83 84 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr) 85 { 86 struct ifmap *ifmap = &ifr->ifr_map; 87 88 if (in_compat_syscall()) { 89 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap; 90 91 cifmap->mem_start = dev->mem_start; 92 cifmap->mem_end = dev->mem_end; 93 cifmap->base_addr = dev->base_addr; 94 cifmap->irq = dev->irq; 95 cifmap->dma = dev->dma; 96 cifmap->port = dev->if_port; 97 98 return 0; 99 } 100 101 ifmap->mem_start = dev->mem_start; 102 ifmap->mem_end = dev->mem_end; 103 ifmap->base_addr = dev->base_addr; 104 ifmap->irq = dev->irq; 105 ifmap->dma = dev->dma; 106 ifmap->port = dev->if_port; 107 108 return 0; 109 } 110 111 static int dev_setifmap(struct net_device *dev, struct ifreq *ifr) 112 { 113 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map; 114 115 if (!dev->netdev_ops->ndo_set_config) 116 return -EOPNOTSUPP; 117 118 if (in_compat_syscall()) { 119 struct ifmap ifmap = { 120 .mem_start = cifmap->mem_start, 121 .mem_end = cifmap->mem_end, 122 .base_addr = cifmap->base_addr, 123 .irq = cifmap->irq, 124 .dma = cifmap->dma, 125 .port = cifmap->port, 126 }; 127 128 return dev->netdev_ops->ndo_set_config(dev, &ifmap); 129 } 130 131 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map); 132 } 133 134 /* 135 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 136 */ 137 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 138 { 139 int err; 140 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 141 142 if (!dev) 143 return -ENODEV; 144 145 switch (cmd) { 146 case SIOCGIFFLAGS: /* Get interface flags */ 147 ifr->ifr_flags = (short) dev_get_flags(dev); 148 return 0; 149 150 case SIOCGIFMETRIC: /* Get the metric on the interface 151 (currently unused) */ 152 ifr->ifr_metric = 0; 153 return 0; 154 155 case SIOCGIFMTU: /* Get the MTU of a device */ 156 ifr->ifr_mtu = dev->mtu; 157 return 0; 158 159 case SIOCGIFSLAVE: 160 err = -EINVAL; 161 break; 162 163 case SIOCGIFMAP: 164 return dev_getifmap(dev, ifr); 165 166 case SIOCGIFINDEX: 167 ifr->ifr_ifindex = dev->ifindex; 168 return 0; 169 170 case SIOCGIFTXQLEN: 171 ifr->ifr_qlen = dev->tx_queue_len; 172 return 0; 173 174 default: 175 /* dev_ioctl() should ensure this case 176 * is never reached 177 */ 178 WARN_ON(1); 179 err = -ENOTTY; 180 break; 181 182 } 183 return err; 184 } 185 186 static int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg) 187 { 188 enum hwtstamp_tx_types tx_type; 189 enum hwtstamp_rx_filters rx_filter; 190 int tx_type_valid = 0; 191 int rx_filter_valid = 0; 192 193 if (cfg->flags & ~HWTSTAMP_FLAG_MASK) 194 return -EINVAL; 195 196 tx_type = cfg->tx_type; 197 rx_filter = cfg->rx_filter; 198 199 switch (tx_type) { 200 case HWTSTAMP_TX_OFF: 201 case HWTSTAMP_TX_ON: 202 case HWTSTAMP_TX_ONESTEP_SYNC: 203 case HWTSTAMP_TX_ONESTEP_P2P: 204 tx_type_valid = 1; 205 break; 206 case __HWTSTAMP_TX_CNT: 207 /* not a real value */ 208 break; 209 } 210 211 switch (rx_filter) { 212 case HWTSTAMP_FILTER_NONE: 213 case HWTSTAMP_FILTER_ALL: 214 case HWTSTAMP_FILTER_SOME: 215 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 216 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 217 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 218 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 219 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 220 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 221 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 222 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 223 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 224 case HWTSTAMP_FILTER_PTP_V2_EVENT: 225 case HWTSTAMP_FILTER_PTP_V2_SYNC: 226 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 227 case HWTSTAMP_FILTER_NTP_ALL: 228 rx_filter_valid = 1; 229 break; 230 case __HWTSTAMP_FILTER_CNT: 231 /* not a real value */ 232 break; 233 } 234 235 if (!tx_type_valid || !rx_filter_valid) 236 return -ERANGE; 237 238 return 0; 239 } 240 241 static int dev_eth_ioctl(struct net_device *dev, 242 struct ifreq *ifr, unsigned int cmd) 243 { 244 const struct net_device_ops *ops = dev->netdev_ops; 245 246 if (!ops->ndo_eth_ioctl) 247 return -EOPNOTSUPP; 248 249 if (!netif_device_present(dev)) 250 return -ENODEV; 251 252 return ops->ndo_eth_ioctl(dev, ifr, cmd); 253 } 254 255 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr) 256 { 257 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); 258 } 259 260 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr) 261 { 262 struct kernel_hwtstamp_config kernel_cfg; 263 struct netlink_ext_ack extack = {}; 264 struct hwtstamp_config cfg; 265 int err; 266 267 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 268 return -EFAULT; 269 270 hwtstamp_config_to_kernel(&kernel_cfg, &cfg); 271 272 err = net_hwtstamp_validate(&kernel_cfg); 273 if (err) 274 return err; 275 276 err = dsa_master_hwtstamp_validate(dev, &kernel_cfg, &extack); 277 if (err) { 278 if (extack._msg) 279 netdev_err(dev, "%s\n", extack._msg); 280 return err; 281 } 282 283 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); 284 } 285 286 static int dev_siocbond(struct net_device *dev, 287 struct ifreq *ifr, unsigned int cmd) 288 { 289 const struct net_device_ops *ops = dev->netdev_ops; 290 291 if (ops->ndo_siocbond) { 292 if (netif_device_present(dev)) 293 return ops->ndo_siocbond(dev, ifr, cmd); 294 else 295 return -ENODEV; 296 } 297 298 return -EOPNOTSUPP; 299 } 300 301 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 302 void __user *data, unsigned int cmd) 303 { 304 const struct net_device_ops *ops = dev->netdev_ops; 305 306 if (ops->ndo_siocdevprivate) { 307 if (netif_device_present(dev)) 308 return ops->ndo_siocdevprivate(dev, ifr, data, cmd); 309 else 310 return -ENODEV; 311 } 312 313 return -EOPNOTSUPP; 314 } 315 316 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 317 { 318 const struct net_device_ops *ops = dev->netdev_ops; 319 320 if (ops->ndo_siocwandev) { 321 if (netif_device_present(dev)) 322 return ops->ndo_siocwandev(dev, ifs); 323 else 324 return -ENODEV; 325 } 326 327 return -EOPNOTSUPP; 328 } 329 330 /* 331 * Perform the SIOCxIFxxx calls, inside rtnl_lock() 332 */ 333 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 334 unsigned int cmd) 335 { 336 int err; 337 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 338 const struct net_device_ops *ops; 339 netdevice_tracker dev_tracker; 340 341 if (!dev) 342 return -ENODEV; 343 344 ops = dev->netdev_ops; 345 346 switch (cmd) { 347 case SIOCSIFFLAGS: /* Set interface flags */ 348 return dev_change_flags(dev, ifr->ifr_flags, NULL); 349 350 case SIOCSIFMETRIC: /* Set the metric on the interface 351 (currently unused) */ 352 return -EOPNOTSUPP; 353 354 case SIOCSIFMTU: /* Set the MTU of a device */ 355 return dev_set_mtu(dev, ifr->ifr_mtu); 356 357 case SIOCSIFHWADDR: 358 if (dev->addr_len > sizeof(struct sockaddr)) 359 return -EINVAL; 360 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL); 361 362 case SIOCSIFHWBROADCAST: 363 if (ifr->ifr_hwaddr.sa_family != dev->type) 364 return -EINVAL; 365 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 366 min(sizeof(ifr->ifr_hwaddr.sa_data_min), 367 (size_t)dev->addr_len)); 368 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 369 return 0; 370 371 case SIOCSIFMAP: 372 return dev_setifmap(dev, ifr); 373 374 case SIOCADDMULTI: 375 if (!ops->ndo_set_rx_mode || 376 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 377 return -EINVAL; 378 if (!netif_device_present(dev)) 379 return -ENODEV; 380 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 381 382 case SIOCDELMULTI: 383 if (!ops->ndo_set_rx_mode || 384 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 385 return -EINVAL; 386 if (!netif_device_present(dev)) 387 return -ENODEV; 388 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 389 390 case SIOCSIFTXQLEN: 391 if (ifr->ifr_qlen < 0) 392 return -EINVAL; 393 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 394 395 case SIOCSIFNAME: 396 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 397 return dev_change_name(dev, ifr->ifr_newname); 398 399 case SIOCWANDEV: 400 return dev_siocwandev(dev, &ifr->ifr_settings); 401 402 case SIOCBRADDIF: 403 case SIOCBRDELIF: 404 if (!netif_device_present(dev)) 405 return -ENODEV; 406 if (!netif_is_bridge_master(dev)) 407 return -EOPNOTSUPP; 408 netdev_hold(dev, &dev_tracker, GFP_KERNEL); 409 rtnl_unlock(); 410 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL); 411 netdev_put(dev, &dev_tracker); 412 rtnl_lock(); 413 return err; 414 415 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15: 416 return dev_siocdevprivate(dev, ifr, data, cmd); 417 418 case SIOCSHWTSTAMP: 419 return dev_set_hwtstamp(dev, ifr); 420 421 case SIOCGHWTSTAMP: 422 return dev_get_hwtstamp(dev, ifr); 423 424 case SIOCGMIIPHY: 425 case SIOCGMIIREG: 426 case SIOCSMIIREG: 427 return dev_eth_ioctl(dev, ifr, cmd); 428 429 case SIOCBONDENSLAVE: 430 case SIOCBONDRELEASE: 431 case SIOCBONDSETHWADDR: 432 case SIOCBONDSLAVEINFOQUERY: 433 case SIOCBONDINFOQUERY: 434 case SIOCBONDCHANGEACTIVE: 435 return dev_siocbond(dev, ifr, cmd); 436 437 /* Unknown ioctl */ 438 default: 439 err = -EINVAL; 440 } 441 return err; 442 } 443 444 /** 445 * dev_load - load a network module 446 * @net: the applicable net namespace 447 * @name: name of interface 448 * 449 * If a network interface is not present and the process has suitable 450 * privileges this function loads the module. If module loading is not 451 * available in this kernel then it becomes a nop. 452 */ 453 454 void dev_load(struct net *net, const char *name) 455 { 456 struct net_device *dev; 457 int no_module; 458 459 rcu_read_lock(); 460 dev = dev_get_by_name_rcu(net, name); 461 rcu_read_unlock(); 462 463 no_module = !dev; 464 if (no_module && capable(CAP_NET_ADMIN)) 465 no_module = request_module("netdev-%s", name); 466 if (no_module && capable(CAP_SYS_MODULE)) 467 request_module("%s", name); 468 } 469 EXPORT_SYMBOL(dev_load); 470 471 /* 472 * This function handles all "interface"-type I/O control requests. The actual 473 * 'doing' part of this is dev_ifsioc above. 474 */ 475 476 /** 477 * dev_ioctl - network device ioctl 478 * @net: the applicable net namespace 479 * @cmd: command to issue 480 * @ifr: pointer to a struct ifreq in user space 481 * @data: data exchanged with userspace 482 * @need_copyout: whether or not copy_to_user() should be called 483 * 484 * Issue ioctl functions to devices. This is normally called by the 485 * user space syscall interfaces but can sometimes be useful for 486 * other purposes. The return value is the return from the syscall if 487 * positive or a negative errno code on error. 488 */ 489 490 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 491 void __user *data, bool *need_copyout) 492 { 493 int ret; 494 char *colon; 495 496 if (need_copyout) 497 *need_copyout = true; 498 if (cmd == SIOCGIFNAME) 499 return dev_ifname(net, ifr); 500 501 ifr->ifr_name[IFNAMSIZ-1] = 0; 502 503 colon = strchr(ifr->ifr_name, ':'); 504 if (colon) 505 *colon = 0; 506 507 /* 508 * See which interface the caller is talking about. 509 */ 510 511 switch (cmd) { 512 case SIOCGIFHWADDR: 513 dev_load(net, ifr->ifr_name); 514 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name); 515 if (colon) 516 *colon = ':'; 517 return ret; 518 /* 519 * These ioctl calls: 520 * - can be done by all. 521 * - atomic and do not require locking. 522 * - return a value 523 */ 524 case SIOCGIFFLAGS: 525 case SIOCGIFMETRIC: 526 case SIOCGIFMTU: 527 case SIOCGIFSLAVE: 528 case SIOCGIFMAP: 529 case SIOCGIFINDEX: 530 case SIOCGIFTXQLEN: 531 dev_load(net, ifr->ifr_name); 532 rcu_read_lock(); 533 ret = dev_ifsioc_locked(net, ifr, cmd); 534 rcu_read_unlock(); 535 if (colon) 536 *colon = ':'; 537 return ret; 538 539 case SIOCETHTOOL: 540 dev_load(net, ifr->ifr_name); 541 ret = dev_ethtool(net, ifr, data); 542 if (colon) 543 *colon = ':'; 544 return ret; 545 546 /* 547 * These ioctl calls: 548 * - require superuser power. 549 * - require strict serialization. 550 * - return a value 551 */ 552 case SIOCGMIIPHY: 553 case SIOCGMIIREG: 554 case SIOCSIFNAME: 555 dev_load(net, ifr->ifr_name); 556 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 557 return -EPERM; 558 rtnl_lock(); 559 ret = dev_ifsioc(net, ifr, data, cmd); 560 rtnl_unlock(); 561 if (colon) 562 *colon = ':'; 563 return ret; 564 565 /* 566 * These ioctl calls: 567 * - require superuser power. 568 * - require strict serialization. 569 * - do not return a value 570 */ 571 case SIOCSIFMAP: 572 case SIOCSIFTXQLEN: 573 if (!capable(CAP_NET_ADMIN)) 574 return -EPERM; 575 fallthrough; 576 /* 577 * These ioctl calls: 578 * - require local superuser power. 579 * - require strict serialization. 580 * - do not return a value 581 */ 582 case SIOCSIFFLAGS: 583 case SIOCSIFMETRIC: 584 case SIOCSIFMTU: 585 case SIOCSIFHWADDR: 586 case SIOCSIFSLAVE: 587 case SIOCADDMULTI: 588 case SIOCDELMULTI: 589 case SIOCSIFHWBROADCAST: 590 case SIOCSMIIREG: 591 case SIOCBONDENSLAVE: 592 case SIOCBONDRELEASE: 593 case SIOCBONDSETHWADDR: 594 case SIOCBONDCHANGEACTIVE: 595 case SIOCBRADDIF: 596 case SIOCBRDELIF: 597 case SIOCSHWTSTAMP: 598 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 599 return -EPERM; 600 fallthrough; 601 case SIOCBONDSLAVEINFOQUERY: 602 case SIOCBONDINFOQUERY: 603 dev_load(net, ifr->ifr_name); 604 rtnl_lock(); 605 ret = dev_ifsioc(net, ifr, data, cmd); 606 rtnl_unlock(); 607 if (need_copyout) 608 *need_copyout = false; 609 return ret; 610 611 case SIOCGIFMEM: 612 /* Get the per device memory space. We can add this but 613 * currently do not support it */ 614 case SIOCSIFMEM: 615 /* Set the per device memory buffer space. 616 * Not applicable in our case */ 617 case SIOCSIFLINK: 618 return -ENOTTY; 619 620 /* 621 * Unknown or private ioctl. 622 */ 623 default: 624 if (cmd == SIOCWANDEV || 625 cmd == SIOCGHWTSTAMP || 626 (cmd >= SIOCDEVPRIVATE && 627 cmd <= SIOCDEVPRIVATE + 15)) { 628 dev_load(net, ifr->ifr_name); 629 rtnl_lock(); 630 ret = dev_ifsioc(net, ifr, data, cmd); 631 rtnl_unlock(); 632 return ret; 633 } 634 return -ENOTTY; 635 } 636 } 637