net/core/dev_ioctl.c

   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.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(struct ifreq *ifr)
 187 {
 188         struct hwtstamp_config cfg;
 189         enum hwtstamp_tx_types tx_type;
 190         enum hwtstamp_rx_filters rx_filter;
 191         int tx_type_valid = 0;
 192         int rx_filter_valid = 0;
 193
 194         if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
 195                 return -EFAULT;
 196
 197         if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
 198                 return -EINVAL;
 199
 200         tx_type = cfg.tx_type;
 201         rx_filter = cfg.rx_filter;
 202
 203         switch (tx_type) {
 204         case HWTSTAMP_TX_OFF:
 205         case HWTSTAMP_TX_ON:
 206         case HWTSTAMP_TX_ONESTEP_SYNC:
 207         case HWTSTAMP_TX_ONESTEP_P2P:
 208                 tx_type_valid = 1;
 209                 break;
 210         case __HWTSTAMP_TX_CNT:
 211                 /* not a real value */
 212                 break;
 213         }
 214
 215         switch (rx_filter) {
 216         case HWTSTAMP_FILTER_NONE:
 217         case HWTSTAMP_FILTER_ALL:
 218         case HWTSTAMP_FILTER_SOME:
 219         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 220         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 221         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 222         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 223         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 224         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 225         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 226         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 227         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 228         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 229         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 230         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 231         case HWTSTAMP_FILTER_NTP_ALL:
 232                 rx_filter_valid = 1;
 233                 break;
 234         case __HWTSTAMP_FILTER_CNT:
 235                 /* not a real value */
 236                 break;
 237         }
 238
 239         if (!tx_type_valid || !rx_filter_valid)
 240                 return -ERANGE;
 241
 242         return 0;
 243 }
 244
 245 static int dev_eth_ioctl(struct net_device *dev,
 246                          struct ifreq *ifr, unsigned int cmd)
 247 {
 248         const struct net_device_ops *ops = dev->netdev_ops;
 249         int err;
 250
 251         err = dsa_ndo_eth_ioctl(dev, ifr, cmd);
 252         if (err == 0 || err != -EOPNOTSUPP)
 253                 return err;
 254
 255         if (ops->ndo_eth_ioctl) {
 256                 if (netif_device_present(dev))
 257                         err = ops->ndo_eth_ioctl(dev, ifr, cmd);
 258                 else
 259                         err = -ENODEV;
 260         }
 261
 262         return err;
 263 }
 264
 265 static int dev_siocbond(struct net_device *dev,
 266                         struct ifreq *ifr, unsigned int cmd)
 267 {
 268         const struct net_device_ops *ops = dev->netdev_ops;
 269
 270         if (ops->ndo_siocbond) {
 271                 if (netif_device_present(dev))
 272                         return ops->ndo_siocbond(dev, ifr, cmd);
 273                 else
 274                         return -ENODEV;
 275         }
 276
 277         return -EOPNOTSUPP;
 278 }
 279
 280 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
 281                               void __user *data, unsigned int cmd)
 282 {
 283         const struct net_device_ops *ops = dev->netdev_ops;
 284
 285         if (ops->ndo_siocdevprivate) {
 286                 if (netif_device_present(dev))
 287                         return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
 288                 else
 289                         return -ENODEV;
 290         }
 291
 292         return -EOPNOTSUPP;
 293 }
 294
 295 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
 296 {
 297         const struct net_device_ops *ops = dev->netdev_ops;
 298
 299         if (ops->ndo_siocwandev) {
 300                 if (netif_device_present(dev))
 301                         return ops->ndo_siocwandev(dev, ifs);
 302                 else
 303                         return -ENODEV;
 304         }
 305
 306         return -EOPNOTSUPP;
 307 }
 308
 309 /*
 310  *      Perform the SIOCxIFxxx calls, inside rtnl_lock()
 311  */
 312 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
 313                       unsigned int cmd)
 314 {
 315         int err;
 316         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
 317         const struct net_device_ops *ops;
 318         netdevice_tracker dev_tracker;
 319
 320         if (!dev)
 321                 return -ENODEV;
 322
 323         ops = dev->netdev_ops;
 324
 325         switch (cmd) {
 326         case SIOCSIFFLAGS:      /* Set interface flags */
 327                 return dev_change_flags(dev, ifr->ifr_flags, NULL);
 328
 329         case SIOCSIFMETRIC:     /* Set the metric on the interface
 330                                    (currently unused) */
 331                 return -EOPNOTSUPP;
 332
 333         case SIOCSIFMTU:        /* Set the MTU of a device */
 334                 return dev_set_mtu(dev, ifr->ifr_mtu);
 335
 336         case SIOCSIFHWADDR:
 337                 if (dev->addr_len > sizeof(struct sockaddr))
 338                         return -EINVAL;
 339                 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
 340
 341         case SIOCSIFHWBROADCAST:
 342                 if (ifr->ifr_hwaddr.sa_family != dev->type)
 343                         return -EINVAL;
 344                 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
 345                        min(sizeof(ifr->ifr_hwaddr.sa_data),
 346                            (size_t)dev->addr_len));
 347                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 348                 return 0;
 349
 350         case SIOCSIFMAP:
 351                 return dev_setifmap(dev, ifr);
 352
 353         case SIOCADDMULTI:
 354                 if (!ops->ndo_set_rx_mode ||
 355                     ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
 356                         return -EINVAL;
 357                 if (!netif_device_present(dev))
 358                         return -ENODEV;
 359                 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
 360
 361         case SIOCDELMULTI:
 362                 if (!ops->ndo_set_rx_mode ||
 363                     ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
 364                         return -EINVAL;
 365                 if (!netif_device_present(dev))
 366                         return -ENODEV;
 367                 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
 368
 369         case SIOCSIFTXQLEN:
 370                 if (ifr->ifr_qlen < 0)
 371                         return -EINVAL;
 372                 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
 373
 374         case SIOCSIFNAME:
 375                 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
 376                 return dev_change_name(dev, ifr->ifr_newname);
 377
 378         case SIOCWANDEV:
 379                 return dev_siocwandev(dev, &ifr->ifr_settings);
 380
 381         case SIOCBRADDIF:
 382         case SIOCBRDELIF:
 383                 if (!netif_device_present(dev))
 384                         return -ENODEV;
 385                 if (!netif_is_bridge_master(dev))
 386                         return -EOPNOTSUPP;
 387                 dev_hold_track(dev, &dev_tracker, GFP_KERNEL);
 388                 rtnl_unlock();
 389                 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
 390                 dev_put_track(dev, &dev_tracker);
 391                 rtnl_lock();
 392                 return err;
 393
 394         case SIOCSHWTSTAMP:
 395                 err = net_hwtstamp_validate(ifr);
 396                 if (err)
 397                         return err;
 398                 fallthrough;
 399
 400         /*
 401          *      Unknown or private ioctl
 402          */
 403         default:
 404                 if (cmd >= SIOCDEVPRIVATE &&
 405                     cmd <= SIOCDEVPRIVATE + 15)
 406                         return dev_siocdevprivate(dev, ifr, data, cmd);
 407
 408                 if (cmd == SIOCGMIIPHY ||
 409                     cmd == SIOCGMIIREG ||
 410                     cmd == SIOCSMIIREG ||
 411                     cmd == SIOCSHWTSTAMP ||
 412                     cmd == SIOCGHWTSTAMP) {
 413                         err = dev_eth_ioctl(dev, ifr, cmd);
 414                 } else if (cmd == SIOCBONDENSLAVE ||
 415                     cmd == SIOCBONDRELEASE ||
 416                     cmd == SIOCBONDSETHWADDR ||
 417                     cmd == SIOCBONDSLAVEINFOQUERY ||
 418                     cmd == SIOCBONDINFOQUERY ||
 419                     cmd == SIOCBONDCHANGEACTIVE) {
 420                         err = dev_siocbond(dev, ifr, cmd);
 421                 } else
 422                         err = -EINVAL;
 423
 424         }
 425         return err;
 426 }
 427
 428 /**
 429  *      dev_load        - load a network module
 430  *      @net: the applicable net namespace
 431  *      @name: name of interface
 432  *
 433  *      If a network interface is not present and the process has suitable
 434  *      privileges this function loads the module. If module loading is not
 435  *      available in this kernel then it becomes a nop.
 436  */
 437
 438 void dev_load(struct net *net, const char *name)
 439 {
 440         struct net_device *dev;
 441         int no_module;
 442
 443         rcu_read_lock();
 444         dev = dev_get_by_name_rcu(net, name);
 445         rcu_read_unlock();
 446
 447         no_module = !dev;
 448         if (no_module && capable(CAP_NET_ADMIN))
 449                 no_module = request_module("netdev-%s", name);
 450         if (no_module && capable(CAP_SYS_MODULE))
 451                 request_module("%s", name);
 452 }
 453 EXPORT_SYMBOL(dev_load);
 454
 455 /*
 456  *      This function handles all "interface"-type I/O control requests. The actual
 457  *      'doing' part of this is dev_ifsioc above.
 458  */
 459
 460 /**
 461  *      dev_ioctl       -       network device ioctl
 462  *      @net: the applicable net namespace
 463  *      @cmd: command to issue
 464  *      @ifr: pointer to a struct ifreq in user space
 465  *      @need_copyout: whether or not copy_to_user() should be called
 466  *
 467  *      Issue ioctl functions to devices. This is normally called by the
 468  *      user space syscall interfaces but can sometimes be useful for
 469  *      other purposes. The return value is the return from the syscall if
 470  *      positive or a negative errno code on error.
 471  */
 472
 473 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
 474               void __user *data, bool *need_copyout)
 475 {
 476         int ret;
 477         char *colon;
 478
 479         if (need_copyout)
 480                 *need_copyout = true;
 481         if (cmd == SIOCGIFNAME)
 482                 return dev_ifname(net, ifr);
 483
 484         ifr->ifr_name[IFNAMSIZ-1] = 0;
 485
 486         colon = strchr(ifr->ifr_name, ':');
 487         if (colon)
 488                 *colon = 0;
 489
 490         /*
 491          *      See which interface the caller is talking about.
 492          */
 493
 494         switch (cmd) {
 495         case SIOCGIFHWADDR:
 496                 dev_load(net, ifr->ifr_name);
 497                 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
 498                 if (colon)
 499                         *colon = ':';
 500                 return ret;
 501         /*
 502          *      These ioctl calls:
 503          *      - can be done by all.
 504          *      - atomic and do not require locking.
 505          *      - return a value
 506          */
 507         case SIOCGIFFLAGS:
 508         case SIOCGIFMETRIC:
 509         case SIOCGIFMTU:
 510         case SIOCGIFSLAVE:
 511         case SIOCGIFMAP:
 512         case SIOCGIFINDEX:
 513         case SIOCGIFTXQLEN:
 514                 dev_load(net, ifr->ifr_name);
 515                 rcu_read_lock();
 516                 ret = dev_ifsioc_locked(net, ifr, cmd);
 517                 rcu_read_unlock();
 518                 if (colon)
 519                         *colon = ':';
 520                 return ret;
 521
 522         case SIOCETHTOOL:
 523                 dev_load(net, ifr->ifr_name);
 524                 ret = dev_ethtool(net, ifr, data);
 525                 if (colon)
 526                         *colon = ':';
 527                 return ret;
 528
 529         /*
 530          *      These ioctl calls:
 531          *      - require superuser power.
 532          *      - require strict serialization.
 533          *      - return a value
 534          */
 535         case SIOCGMIIPHY:
 536         case SIOCGMIIREG:
 537         case SIOCSIFNAME:
 538                 dev_load(net, ifr->ifr_name);
 539                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 540                         return -EPERM;
 541                 rtnl_lock();
 542                 ret = dev_ifsioc(net, ifr, data, cmd);
 543                 rtnl_unlock();
 544                 if (colon)
 545                         *colon = ':';
 546                 return ret;
 547
 548         /*
 549          *      These ioctl calls:
 550          *      - require superuser power.
 551          *      - require strict serialization.
 552          *      - do not return a value
 553          */
 554         case SIOCSIFMAP:
 555         case SIOCSIFTXQLEN:
 556                 if (!capable(CAP_NET_ADMIN))
 557                         return -EPERM;
 558                 fallthrough;
 559         /*
 560          *      These ioctl calls:
 561          *      - require local superuser power.
 562          *      - require strict serialization.
 563          *      - do not return a value
 564          */
 565         case SIOCSIFFLAGS:
 566         case SIOCSIFMETRIC:
 567         case SIOCSIFMTU:
 568         case SIOCSIFHWADDR:
 569         case SIOCSIFSLAVE:
 570         case SIOCADDMULTI:
 571         case SIOCDELMULTI:
 572         case SIOCSIFHWBROADCAST:
 573         case SIOCSMIIREG:
 574         case SIOCBONDENSLAVE:
 575         case SIOCBONDRELEASE:
 576         case SIOCBONDSETHWADDR:
 577         case SIOCBONDCHANGEACTIVE:
 578         case SIOCBRADDIF:
 579         case SIOCBRDELIF:
 580         case SIOCSHWTSTAMP:
 581                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 582                         return -EPERM;
 583                 fallthrough;
 584         case SIOCBONDSLAVEINFOQUERY:
 585         case SIOCBONDINFOQUERY:
 586                 dev_load(net, ifr->ifr_name);
 587                 rtnl_lock();
 588                 ret = dev_ifsioc(net, ifr, data, cmd);
 589                 rtnl_unlock();
 590                 if (need_copyout)
 591                         *need_copyout = false;
 592                 return ret;
 593
 594         case SIOCGIFMEM:
 595                 /* Get the per device memory space. We can add this but
 596                  * currently do not support it */
 597         case SIOCSIFMEM:
 598                 /* Set the per device memory buffer space.
 599                  * Not applicable in our case */
 600         case SIOCSIFLINK:
 601                 return -ENOTTY;
 602
 603         /*
 604          *      Unknown or private ioctl.
 605          */
 606         default:
 607                 if (cmd == SIOCWANDEV ||
 608                     cmd == SIOCGHWTSTAMP ||
 609                     (cmd >= SIOCDEVPRIVATE &&
 610                      cmd <= SIOCDEVPRIVATE + 15)) {
 611                         dev_load(net, ifr->ifr_name);
 612                         rtnl_lock();
 613                         ret = dev_ifsioc(net, ifr, data, cmd);
 614                         rtnl_unlock();
 615                         return ret;
 616                 }
 617                 return -ENOTTY;
 618         }
 619 }