net/core/ethtool.c

   1 /*
   2  * net/core/ethtool.c - Ethtool ioctl handler
   3  * Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
   4  *
   5  * This file is where we call all the ethtool_ops commands to get
   6  * the information ethtool needs.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/capability.h>
  17 #include <linux/errno.h>
  18 #include <linux/ethtool.h>
  19 #include <linux/netdevice.h>
  20 #include <asm/uaccess.h>
  21
  22 /*
  23  * Some useful ethtool_ops methods that're device independent.
  24  * If we find that all drivers want to do the same thing here,
  25  * we can turn these into dev_() function calls.
  26  */
  27
  28 u32 ethtool_op_get_link(struct net_device *dev)
  29 {
  30         return netif_carrier_ok(dev) ? 1 : 0;
  31 }
  32
  33 u32 ethtool_op_get_tx_csum(struct net_device *dev)
  34 {
  35         return (dev->features & NETIF_F_ALL_CSUM) != 0;
  36 }
  37
  38 int ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
  39 {
  40         if (data)
  41                 dev->features |= NETIF_F_IP_CSUM;
  42         else
  43                 dev->features &= ~NETIF_F_IP_CSUM;
  44
  45         return 0;
  46 }
  47
  48 int ethtool_op_set_tx_hw_csum(struct net_device *dev, u32 data)
  49 {
  50         if (data)
  51                 dev->features |= NETIF_F_HW_CSUM;
  52         else
  53                 dev->features &= ~NETIF_F_HW_CSUM;
  54
  55         return 0;
  56 }
  57
  58 int ethtool_op_set_tx_ipv6_csum(struct net_device *dev, u32 data)
  59 {
  60         if (data)
  61                 dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
  62         else
  63                 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
  64
  65         return 0;
  66 }
  67
  68 u32 ethtool_op_get_sg(struct net_device *dev)
  69 {
  70         return (dev->features & NETIF_F_SG) != 0;
  71 }
  72
  73 int ethtool_op_set_sg(struct net_device *dev, u32 data)
  74 {
  75         if (data)
  76                 dev->features |= NETIF_F_SG;
  77         else
  78                 dev->features &= ~NETIF_F_SG;
  79
  80         return 0;
  81 }
  82
  83 u32 ethtool_op_get_tso(struct net_device *dev)
  84 {
  85         return (dev->features & NETIF_F_TSO) != 0;
  86 }
  87
  88 int ethtool_op_set_tso(struct net_device *dev, u32 data)
  89 {
  90         if (data)
  91                 dev->features |= NETIF_F_TSO;
  92         else
  93                 dev->features &= ~NETIF_F_TSO;
  94
  95         return 0;
  96 }
  97
  98 u32 ethtool_op_get_ufo(struct net_device *dev)
  99 {
 100         return (dev->features & NETIF_F_UFO) != 0;
 101 }
 102
 103 int ethtool_op_set_ufo(struct net_device *dev, u32 data)
 104 {
 105         if (data)
 106                 dev->features |= NETIF_F_UFO;
 107         else
 108                 dev->features &= ~NETIF_F_UFO;
 109         return 0;
 110 }
 111
 112 /* the following list of flags are the same as their associated
 113  * NETIF_F_xxx values in include/linux/netdevice.h
 114  */
 115 static const u32 flags_dup_features =
 116         ETH_FLAG_LRO;
 117
 118 u32 ethtool_op_get_flags(struct net_device *dev)
 119 {
 120         /* in the future, this function will probably contain additional
 121          * handling for flags which are not so easily handled
 122          * by a simple masking operation
 123          */
 124
 125         return dev->features & flags_dup_features;
 126 }
 127
 128 int ethtool_op_set_flags(struct net_device *dev, u32 data)
 129 {
 130         if (data & ETH_FLAG_LRO)
 131                 dev->features |= NETIF_F_LRO;
 132         else
 133                 dev->features &= ~NETIF_F_LRO;
 134
 135         return 0;
 136 }
 137
 138 /* Handlers for each ethtool command */
 139
 140 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 141 {
 142         struct ethtool_cmd cmd = { ETHTOOL_GSET };
 143         int err;
 144
 145         if (!dev->ethtool_ops->get_settings)
 146                 return -EOPNOTSUPP;
 147
 148         err = dev->ethtool_ops->get_settings(dev, &cmd);
 149         if (err < 0)
 150                 return err;
 151
 152         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 153                 return -EFAULT;
 154         return 0;
 155 }
 156
 157 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 158 {
 159         struct ethtool_cmd cmd;
 160
 161         if (!dev->ethtool_ops->set_settings)
 162                 return -EOPNOTSUPP;
 163
 164         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 165                 return -EFAULT;
 166
 167         return dev->ethtool_ops->set_settings(dev, &cmd);
 168 }
 169
 170 static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr)
 171 {
 172         struct ethtool_drvinfo info;
 173         const struct ethtool_ops *ops = dev->ethtool_ops;
 174
 175         if (!ops->get_drvinfo)
 176                 return -EOPNOTSUPP;
 177
 178         memset(&info, 0, sizeof(info));
 179         info.cmd = ETHTOOL_GDRVINFO;
 180         ops->get_drvinfo(dev, &info);
 181
 182         if (ops->get_sset_count) {
 183                 int rc;
 184
 185                 rc = ops->get_sset_count(dev, ETH_SS_TEST);
 186                 if (rc >= 0)
 187                         info.testinfo_len = rc;
 188                 rc = ops->get_sset_count(dev, ETH_SS_STATS);
 189                 if (rc >= 0)
 190                         info.n_stats = rc;
 191                 rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
 192                 if (rc >= 0)
 193                         info.n_priv_flags = rc;
 194         } else {
 195                 /* code path for obsolete hooks */
 196
 197                 if (ops->self_test_count)
 198                         info.testinfo_len = ops->self_test_count(dev);
 199                 if (ops->get_stats_count)
 200                         info.n_stats = ops->get_stats_count(dev);
 201         }
 202         if (ops->get_regs_len)
 203                 info.regdump_len = ops->get_regs_len(dev);
 204         if (ops->get_eeprom_len)
 205                 info.eedump_len = ops->get_eeprom_len(dev);
 206
 207         if (copy_to_user(useraddr, &info, sizeof(info)))
 208                 return -EFAULT;
 209         return 0;
 210 }
 211
 212 static int ethtool_set_rxhash(struct net_device *dev, void __user *useraddr)
 213 {
 214         struct ethtool_rxnfc cmd;
 215
 216         if (!dev->ethtool_ops->set_rxhash)
 217                 return -EOPNOTSUPP;
 218
 219         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 220                 return -EFAULT;
 221
 222         return dev->ethtool_ops->set_rxhash(dev, &cmd);
 223 }
 224
 225 static int ethtool_get_rxhash(struct net_device *dev, void __user *useraddr)
 226 {
 227         struct ethtool_rxnfc info;
 228
 229         if (!dev->ethtool_ops->get_rxhash)
 230                 return -EOPNOTSUPP;
 231
 232         if (copy_from_user(&info, useraddr, sizeof(info)))
 233                 return -EFAULT;
 234
 235         dev->ethtool_ops->get_rxhash(dev, &info);
 236
 237         if (copy_to_user(useraddr, &info, sizeof(info)))
 238                 return -EFAULT;
 239         return 0;
 240 }
 241
 242 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 243 {
 244         struct ethtool_regs regs;
 245         const struct ethtool_ops *ops = dev->ethtool_ops;
 246         void *regbuf;
 247         int reglen, ret;
 248
 249         if (!ops->get_regs || !ops->get_regs_len)
 250                 return -EOPNOTSUPP;
 251
 252         if (copy_from_user(&regs, useraddr, sizeof(regs)))
 253                 return -EFAULT;
 254
 255         reglen = ops->get_regs_len(dev);
 256         if (regs.len > reglen)
 257                 regs.len = reglen;
 258
 259         regbuf = kmalloc(reglen, GFP_USER);
 260         if (!regbuf)
 261                 return -ENOMEM;
 262
 263         ops->get_regs(dev, &regs, regbuf);
 264
 265         ret = -EFAULT;
 266         if (copy_to_user(useraddr, &regs, sizeof(regs)))
 267                 goto out;
 268         useraddr += offsetof(struct ethtool_regs, data);
 269         if (copy_to_user(useraddr, regbuf, regs.len))
 270                 goto out;
 271         ret = 0;
 272
 273  out:
 274         kfree(regbuf);
 275         return ret;
 276 }
 277
 278 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
 279 {
 280         struct ethtool_wolinfo wol = { ETHTOOL_GWOL };
 281
 282         if (!dev->ethtool_ops->get_wol)
 283                 return -EOPNOTSUPP;
 284
 285         dev->ethtool_ops->get_wol(dev, &wol);
 286
 287         if (copy_to_user(useraddr, &wol, sizeof(wol)))
 288                 return -EFAULT;
 289         return 0;
 290 }
 291
 292 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
 293 {
 294         struct ethtool_wolinfo wol;
 295
 296         if (!dev->ethtool_ops->set_wol)
 297                 return -EOPNOTSUPP;
 298
 299         if (copy_from_user(&wol, useraddr, sizeof(wol)))
 300                 return -EFAULT;
 301
 302         return dev->ethtool_ops->set_wol(dev, &wol);
 303 }
 304
 305 static int ethtool_nway_reset(struct net_device *dev)
 306 {
 307         if (!dev->ethtool_ops->nway_reset)
 308                 return -EOPNOTSUPP;
 309
 310         return dev->ethtool_ops->nway_reset(dev);
 311 }
 312
 313 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
 314 {
 315         struct ethtool_eeprom eeprom;
 316         const struct ethtool_ops *ops = dev->ethtool_ops;
 317         void __user *userbuf = useraddr + sizeof(eeprom);
 318         u32 bytes_remaining;
 319         u8 *data;
 320         int ret = 0;
 321
 322         if (!ops->get_eeprom || !ops->get_eeprom_len)
 323                 return -EOPNOTSUPP;
 324
 325         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
 326                 return -EFAULT;
 327
 328         /* Check for wrap and zero */
 329         if (eeprom.offset + eeprom.len <= eeprom.offset)
 330                 return -EINVAL;
 331
 332         /* Check for exceeding total eeprom len */
 333         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
 334                 return -EINVAL;
 335
 336         data = kmalloc(PAGE_SIZE, GFP_USER);
 337         if (!data)
 338                 return -ENOMEM;
 339
 340         bytes_remaining = eeprom.len;
 341         while (bytes_remaining > 0) {
 342                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
 343
 344                 ret = ops->get_eeprom(dev, &eeprom, data);
 345                 if (ret)
 346                         break;
 347                 if (copy_to_user(userbuf, data, eeprom.len)) {
 348                         ret = -EFAULT;
 349                         break;
 350                 }
 351                 userbuf += eeprom.len;
 352                 eeprom.offset += eeprom.len;
 353                 bytes_remaining -= eeprom.len;
 354         }
 355
 356         eeprom.len = userbuf - (useraddr + sizeof(eeprom));
 357         eeprom.offset -= eeprom.len;
 358         if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
 359                 ret = -EFAULT;
 360
 361         kfree(data);
 362         return ret;
 363 }
 364
 365 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
 366 {
 367         struct ethtool_eeprom eeprom;
 368         const struct ethtool_ops *ops = dev->ethtool_ops;
 369         void __user *userbuf = useraddr + sizeof(eeprom);
 370         u32 bytes_remaining;
 371         u8 *data;
 372         int ret = 0;
 373
 374         if (!ops->set_eeprom || !ops->get_eeprom_len)
 375                 return -EOPNOTSUPP;
 376
 377         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
 378                 return -EFAULT;
 379
 380         /* Check for wrap and zero */
 381         if (eeprom.offset + eeprom.len <= eeprom.offset)
 382                 return -EINVAL;
 383
 384         /* Check for exceeding total eeprom len */
 385         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
 386                 return -EINVAL;
 387
 388         data = kmalloc(PAGE_SIZE, GFP_USER);
 389         if (!data)
 390                 return -ENOMEM;
 391
 392         bytes_remaining = eeprom.len;
 393         while (bytes_remaining > 0) {
 394                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
 395
 396                 if (copy_from_user(data, userbuf, eeprom.len)) {
 397                         ret = -EFAULT;
 398                         break;
 399                 }
 400                 ret = ops->set_eeprom(dev, &eeprom, data);
 401                 if (ret)
 402                         break;
 403                 userbuf += eeprom.len;
 404                 eeprom.offset += eeprom.len;
 405                 bytes_remaining -= eeprom.len;
 406         }
 407
 408         kfree(data);
 409         return ret;
 410 }
 411
 412 static int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr)
 413 {
 414         struct ethtool_coalesce coalesce = { ETHTOOL_GCOALESCE };
 415
 416         if (!dev->ethtool_ops->get_coalesce)
 417                 return -EOPNOTSUPP;
 418
 419         dev->ethtool_ops->get_coalesce(dev, &coalesce);
 420
 421         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
 422                 return -EFAULT;
 423         return 0;
 424 }
 425
 426 static int ethtool_set_coalesce(struct net_device *dev, void __user *useraddr)
 427 {
 428         struct ethtool_coalesce coalesce;
 429
 430         if (!dev->ethtool_ops->set_coalesce)
 431                 return -EOPNOTSUPP;
 432
 433         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
 434                 return -EFAULT;
 435
 436         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
 437 }
 438
 439 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
 440 {
 441         struct ethtool_ringparam ringparam = { ETHTOOL_GRINGPARAM };
 442
 443         if (!dev->ethtool_ops->get_ringparam)
 444                 return -EOPNOTSUPP;
 445
 446         dev->ethtool_ops->get_ringparam(dev, &ringparam);
 447
 448         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
 449                 return -EFAULT;
 450         return 0;
 451 }
 452
 453 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
 454 {
 455         struct ethtool_ringparam ringparam;
 456
 457         if (!dev->ethtool_ops->set_ringparam)
 458                 return -EOPNOTSUPP;
 459
 460         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
 461                 return -EFAULT;
 462
 463         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
 464 }
 465
 466 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
 467 {
 468         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
 469
 470         if (!dev->ethtool_ops->get_pauseparam)
 471                 return -EOPNOTSUPP;
 472
 473         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
 474
 475         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
 476                 return -EFAULT;
 477         return 0;
 478 }
 479
 480 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
 481 {
 482         struct ethtool_pauseparam pauseparam;
 483
 484         if (!dev->ethtool_ops->set_pauseparam)
 485                 return -EOPNOTSUPP;
 486
 487         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
 488                 return -EFAULT;
 489
 490         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
 491 }
 492
 493 static int __ethtool_set_sg(struct net_device *dev, u32 data)
 494 {
 495         int err;
 496
 497         if (!data && dev->ethtool_ops->set_tso) {
 498                 err = dev->ethtool_ops->set_tso(dev, 0);
 499                 if (err)
 500                         return err;
 501         }
 502
 503         if (!data && dev->ethtool_ops->set_ufo) {
 504                 err = dev->ethtool_ops->set_ufo(dev, 0);
 505                 if (err)
 506                         return err;
 507         }
 508         return dev->ethtool_ops->set_sg(dev, data);
 509 }
 510
 511 static int ethtool_set_tx_csum(struct net_device *dev, char __user *useraddr)
 512 {
 513         struct ethtool_value edata;
 514         int err;
 515
 516         if (!dev->ethtool_ops->set_tx_csum)
 517                 return -EOPNOTSUPP;
 518
 519         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 520                 return -EFAULT;
 521
 522         if (!edata.data && dev->ethtool_ops->set_sg) {
 523                 err = __ethtool_set_sg(dev, 0);
 524                 if (err)
 525                         return err;
 526         }
 527
 528         return dev->ethtool_ops->set_tx_csum(dev, edata.data);
 529 }
 530
 531 static int ethtool_set_rx_csum(struct net_device *dev, char __user *useraddr)
 532 {
 533         struct ethtool_value edata;
 534
 535         if (!dev->ethtool_ops->set_rx_csum)
 536                 return -EOPNOTSUPP;
 537
 538         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 539                 return -EFAULT;
 540
 541         if (!edata.data && dev->ethtool_ops->set_sg)
 542                 dev->features &= ~NETIF_F_GRO;
 543
 544         return dev->ethtool_ops->set_rx_csum(dev, edata.data);
 545 }
 546
 547 static int ethtool_set_sg(struct net_device *dev, char __user *useraddr)
 548 {
 549         struct ethtool_value edata;
 550
 551         if (!dev->ethtool_ops->set_sg)
 552                 return -EOPNOTSUPP;
 553
 554         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 555                 return -EFAULT;
 556
 557         if (edata.data &&
 558             !(dev->features & NETIF_F_ALL_CSUM))
 559                 return -EINVAL;
 560
 561         return __ethtool_set_sg(dev, edata.data);
 562 }
 563
 564 static int ethtool_set_tso(struct net_device *dev, char __user *useraddr)
 565 {
 566         struct ethtool_value edata;
 567
 568         if (!dev->ethtool_ops->set_tso)
 569                 return -EOPNOTSUPP;
 570
 571         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 572                 return -EFAULT;
 573
 574         if (edata.data && !(dev->features & NETIF_F_SG))
 575                 return -EINVAL;
 576
 577         return dev->ethtool_ops->set_tso(dev, edata.data);
 578 }
 579
 580 static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
 581 {
 582         struct ethtool_value edata;
 583
 584         if (!dev->ethtool_ops->set_ufo)
 585                 return -EOPNOTSUPP;
 586         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 587                 return -EFAULT;
 588         if (edata.data && !(dev->features & NETIF_F_SG))
 589                 return -EINVAL;
 590         if (edata.data && !(dev->features & NETIF_F_HW_CSUM))
 591                 return -EINVAL;
 592         return dev->ethtool_ops->set_ufo(dev, edata.data);
 593 }
 594
 595 static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
 596 {
 597         struct ethtool_value edata = { ETHTOOL_GGSO };
 598
 599         edata.data = dev->features & NETIF_F_GSO;
 600         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 601                  return -EFAULT;
 602         return 0;
 603 }
 604
 605 static int ethtool_set_gso(struct net_device *dev, char __user *useraddr)
 606 {
 607         struct ethtool_value edata;
 608
 609         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 610                 return -EFAULT;
 611         if (edata.data)
 612                 dev->features |= NETIF_F_GSO;
 613         else
 614                 dev->features &= ~NETIF_F_GSO;
 615         return 0;
 616 }
 617
 618 static int ethtool_get_gro(struct net_device *dev, char __user *useraddr)
 619 {
 620         struct ethtool_value edata = { ETHTOOL_GGRO };
 621
 622         edata.data = dev->features & NETIF_F_GRO;
 623         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 624                  return -EFAULT;
 625         return 0;
 626 }
 627
 628 static int ethtool_set_gro(struct net_device *dev, char __user *useraddr)
 629 {
 630         struct ethtool_value edata;
 631
 632         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 633                 return -EFAULT;
 634
 635         if (edata.data) {
 636                 if (!dev->ethtool_ops->get_rx_csum ||
 637                     !dev->ethtool_ops->get_rx_csum(dev))
 638                         return -EINVAL;
 639                 dev->features |= NETIF_F_GRO;
 640         } else
 641                 dev->features &= ~NETIF_F_GRO;
 642
 643         return 0;
 644 }
 645
 646 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 647 {
 648         struct ethtool_test test;
 649         const struct ethtool_ops *ops = dev->ethtool_ops;
 650         u64 *data;
 651         int ret, test_len;
 652
 653         if (!ops->self_test)
 654                 return -EOPNOTSUPP;
 655         if (!ops->get_sset_count && !ops->self_test_count)
 656                 return -EOPNOTSUPP;
 657
 658         if (ops->get_sset_count)
 659                 test_len = ops->get_sset_count(dev, ETH_SS_TEST);
 660         else
 661                 /* code path for obsolete hook */
 662                 test_len = ops->self_test_count(dev);
 663         if (test_len < 0)
 664                 return test_len;
 665         WARN_ON(test_len == 0);
 666
 667         if (copy_from_user(&test, useraddr, sizeof(test)))
 668                 return -EFAULT;
 669
 670         test.len = test_len;
 671         data = kmalloc(test_len * sizeof(u64), GFP_USER);
 672         if (!data)
 673                 return -ENOMEM;
 674
 675         ops->self_test(dev, &test, data);
 676
 677         ret = -EFAULT;
 678         if (copy_to_user(useraddr, &test, sizeof(test)))
 679                 goto out;
 680         useraddr += sizeof(test);
 681         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
 682                 goto out;
 683         ret = 0;
 684
 685  out:
 686         kfree(data);
 687         return ret;
 688 }
 689
 690 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 691 {
 692         struct ethtool_gstrings gstrings;
 693         const struct ethtool_ops *ops = dev->ethtool_ops;
 694         u8 *data;
 695         int ret;
 696
 697         if (!ops->get_strings)
 698                 return -EOPNOTSUPP;
 699
 700         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
 701                 return -EFAULT;
 702
 703         if (ops->get_sset_count) {
 704                 ret = ops->get_sset_count(dev, gstrings.string_set);
 705                 if (ret < 0)
 706                         return ret;
 707
 708                 gstrings.len = ret;
 709         } else {
 710                 /* code path for obsolete hooks */
 711
 712                 switch (gstrings.string_set) {
 713                 case ETH_SS_TEST:
 714                         if (!ops->self_test_count)
 715                                 return -EOPNOTSUPP;
 716                         gstrings.len = ops->self_test_count(dev);
 717                         break;
 718                 case ETH_SS_STATS:
 719                         if (!ops->get_stats_count)
 720                                 return -EOPNOTSUPP;
 721                         gstrings.len = ops->get_stats_count(dev);
 722                         break;
 723                 default:
 724                         return -EINVAL;
 725                 }
 726         }
 727
 728         data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
 729         if (!data)
 730                 return -ENOMEM;
 731
 732         ops->get_strings(dev, gstrings.string_set, data);
 733
 734         ret = -EFAULT;
 735         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
 736                 goto out;
 737         useraddr += sizeof(gstrings);
 738         if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
 739                 goto out;
 740         ret = 0;
 741
 742  out:
 743         kfree(data);
 744         return ret;
 745 }
 746
 747 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 748 {
 749         struct ethtool_value id;
 750
 751         if (!dev->ethtool_ops->phys_id)
 752                 return -EOPNOTSUPP;
 753
 754         if (copy_from_user(&id, useraddr, sizeof(id)))
 755                 return -EFAULT;
 756
 757         return dev->ethtool_ops->phys_id(dev, id.data);
 758 }
 759
 760 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
 761 {
 762         struct ethtool_stats stats;
 763         const struct ethtool_ops *ops = dev->ethtool_ops;
 764         u64 *data;
 765         int ret, n_stats;
 766
 767         if (!ops->get_ethtool_stats)
 768                 return -EOPNOTSUPP;
 769         if (!ops->get_sset_count && !ops->get_stats_count)
 770                 return -EOPNOTSUPP;
 771
 772         if (ops->get_sset_count)
 773                 n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
 774         else
 775                 /* code path for obsolete hook */
 776                 n_stats = ops->get_stats_count(dev);
 777         if (n_stats < 0)
 778                 return n_stats;
 779         WARN_ON(n_stats == 0);
 780
 781         if (copy_from_user(&stats, useraddr, sizeof(stats)))
 782                 return -EFAULT;
 783
 784         stats.n_stats = n_stats;
 785         data = kmalloc(n_stats * sizeof(u64), GFP_USER);
 786         if (!data)
 787                 return -ENOMEM;
 788
 789         ops->get_ethtool_stats(dev, &stats, data);
 790
 791         ret = -EFAULT;
 792         if (copy_to_user(useraddr, &stats, sizeof(stats)))
 793                 goto out;
 794         useraddr += sizeof(stats);
 795         if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
 796                 goto out;
 797         ret = 0;
 798
 799  out:
 800         kfree(data);
 801         return ret;
 802 }
 803
 804 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
 805 {
 806         struct ethtool_perm_addr epaddr;
 807
 808         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
 809                 return -EFAULT;
 810
 811         if (epaddr.size < dev->addr_len)
 812                 return -ETOOSMALL;
 813         epaddr.size = dev->addr_len;
 814
 815         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
 816                 return -EFAULT;
 817         useraddr += sizeof(epaddr);
 818         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
 819                 return -EFAULT;
 820         return 0;
 821 }
 822
 823 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
 824                              u32 cmd, u32 (*actor)(struct net_device *))
 825 {
 826         struct ethtool_value edata = { cmd };
 827
 828         if (!actor)
 829                 return -EOPNOTSUPP;
 830
 831         edata.data = actor(dev);
 832
 833         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 834                 return -EFAULT;
 835         return 0;
 836 }
 837
 838 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
 839                              void (*actor)(struct net_device *, u32))
 840 {
 841         struct ethtool_value edata;
 842
 843         if (!actor)
 844                 return -EOPNOTSUPP;
 845
 846         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 847                 return -EFAULT;
 848
 849         actor(dev, edata.data);
 850         return 0;
 851 }
 852
 853 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
 854                              int (*actor)(struct net_device *, u32))
 855 {
 856         struct ethtool_value edata;
 857
 858         if (!actor)
 859                 return -EOPNOTSUPP;
 860
 861         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 862                 return -EFAULT;
 863
 864         return actor(dev, edata.data);
 865 }
 866
 867 /* The main entry point in this file.  Called from net/core/dev.c */
 868
 869 int dev_ethtool(struct net *net, struct ifreq *ifr)
 870 {
 871         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
 872         void __user *useraddr = ifr->ifr_data;
 873         u32 ethcmd;
 874         int rc;
 875         unsigned long old_features;
 876
 877         if (!dev || !netif_device_present(dev))
 878                 return -ENODEV;
 879
 880         if (!dev->ethtool_ops)
 881                 return -EOPNOTSUPP;
 882
 883         if (copy_from_user(&ethcmd, useraddr, sizeof (ethcmd)))
 884                 return -EFAULT;
 885
 886         /* Allow some commands to be done by anyone */
 887         switch(ethcmd) {
 888         case ETHTOOL_GDRVINFO:
 889         case ETHTOOL_GMSGLVL:
 890         case ETHTOOL_GCOALESCE:
 891         case ETHTOOL_GRINGPARAM:
 892         case ETHTOOL_GPAUSEPARAM:
 893         case ETHTOOL_GRXCSUM:
 894         case ETHTOOL_GTXCSUM:
 895         case ETHTOOL_GSG:
 896         case ETHTOOL_GSTRINGS:
 897         case ETHTOOL_GTSO:
 898         case ETHTOOL_GPERMADDR:
 899         case ETHTOOL_GUFO:
 900         case ETHTOOL_GGSO:
 901         case ETHTOOL_GFLAGS:
 902         case ETHTOOL_GPFLAGS:
 903         case ETHTOOL_GRXFH:
 904                 break;
 905         default:
 906                 if (!capable(CAP_NET_ADMIN))
 907                         return -EPERM;
 908         }
 909
 910         if (dev->ethtool_ops->begin)
 911                 if ((rc = dev->ethtool_ops->begin(dev)) < 0)
 912                         return rc;
 913
 914         old_features = dev->features;
 915
 916         switch (ethcmd) {
 917         case ETHTOOL_GSET:
 918                 rc = ethtool_get_settings(dev, useraddr);
 919                 break;
 920         case ETHTOOL_SSET:
 921                 rc = ethtool_set_settings(dev, useraddr);
 922                 break;
 923         case ETHTOOL_GDRVINFO:
 924                 rc = ethtool_get_drvinfo(dev, useraddr);
 925                 break;
 926         case ETHTOOL_GREGS:
 927                 rc = ethtool_get_regs(dev, useraddr);
 928                 break;
 929         case ETHTOOL_GWOL:
 930                 rc = ethtool_get_wol(dev, useraddr);
 931                 break;
 932         case ETHTOOL_SWOL:
 933                 rc = ethtool_set_wol(dev, useraddr);
 934                 break;
 935         case ETHTOOL_GMSGLVL:
 936                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 937                                        dev->ethtool_ops->get_msglevel);
 938                 break;
 939         case ETHTOOL_SMSGLVL:
 940                 rc = ethtool_set_value_void(dev, useraddr,
 941                                        dev->ethtool_ops->set_msglevel);
 942                 break;
 943         case ETHTOOL_NWAY_RST:
 944                 rc = ethtool_nway_reset(dev);
 945                 break;
 946         case ETHTOOL_GLINK:
 947                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 948                                        dev->ethtool_ops->get_link);
 949                 break;
 950         case ETHTOOL_GEEPROM:
 951                 rc = ethtool_get_eeprom(dev, useraddr);
 952                 break;
 953         case ETHTOOL_SEEPROM:
 954                 rc = ethtool_set_eeprom(dev, useraddr);
 955                 break;
 956         case ETHTOOL_GCOALESCE:
 957                 rc = ethtool_get_coalesce(dev, useraddr);
 958                 break;
 959         case ETHTOOL_SCOALESCE:
 960                 rc = ethtool_set_coalesce(dev, useraddr);
 961                 break;
 962         case ETHTOOL_GRINGPARAM:
 963                 rc = ethtool_get_ringparam(dev, useraddr);
 964                 break;
 965         case ETHTOOL_SRINGPARAM:
 966                 rc = ethtool_set_ringparam(dev, useraddr);
 967                 break;
 968         case ETHTOOL_GPAUSEPARAM:
 969                 rc = ethtool_get_pauseparam(dev, useraddr);
 970                 break;
 971         case ETHTOOL_SPAUSEPARAM:
 972                 rc = ethtool_set_pauseparam(dev, useraddr);
 973                 break;
 974         case ETHTOOL_GRXCSUM:
 975                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 976                                        dev->ethtool_ops->get_rx_csum);
 977                 break;
 978         case ETHTOOL_SRXCSUM:
 979                 rc = ethtool_set_rx_csum(dev, useraddr);
 980                 break;
 981         case ETHTOOL_GTXCSUM:
 982                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 983                                        (dev->ethtool_ops->get_tx_csum ?
 984                                         dev->ethtool_ops->get_tx_csum :
 985                                         ethtool_op_get_tx_csum));
 986                 break;
 987         case ETHTOOL_STXCSUM:
 988                 rc = ethtool_set_tx_csum(dev, useraddr);
 989                 break;
 990         case ETHTOOL_GSG:
 991                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 992                                        (dev->ethtool_ops->get_sg ?
 993                                         dev->ethtool_ops->get_sg :
 994                                         ethtool_op_get_sg));
 995                 break;
 996         case ETHTOOL_SSG:
 997                 rc = ethtool_set_sg(dev, useraddr);
 998                 break;
 999         case ETHTOOL_GTSO:
1000                 rc = ethtool_get_value(dev, useraddr, ethcmd,
1001                                        (dev->ethtool_ops->get_tso ?
1002                                         dev->ethtool_ops->get_tso :
1003                                         ethtool_op_get_tso));
1004                 break;
1005         case ETHTOOL_STSO:
1006                 rc = ethtool_set_tso(dev, useraddr);
1007                 break;
1008         case ETHTOOL_TEST:
1009                 rc = ethtool_self_test(dev, useraddr);
1010                 break;
1011         case ETHTOOL_GSTRINGS:
1012                 rc = ethtool_get_strings(dev, useraddr);
1013                 break;
1014         case ETHTOOL_PHYS_ID:
1015                 rc = ethtool_phys_id(dev, useraddr);
1016                 break;
1017         case ETHTOOL_GSTATS:
1018                 rc = ethtool_get_stats(dev, useraddr);
1019                 break;
1020         case ETHTOOL_GPERMADDR:
1021                 rc = ethtool_get_perm_addr(dev, useraddr);
1022                 break;
1023         case ETHTOOL_GUFO:
1024                 rc = ethtool_get_value(dev, useraddr, ethcmd,
1025                                        (dev->ethtool_ops->get_ufo ?
1026                                         dev->ethtool_ops->get_ufo :
1027                                         ethtool_op_get_ufo));
1028                 break;
1029         case ETHTOOL_SUFO:
1030                 rc = ethtool_set_ufo(dev, useraddr);
1031                 break;
1032         case ETHTOOL_GGSO:
1033                 rc = ethtool_get_gso(dev, useraddr);
1034                 break;
1035         case ETHTOOL_SGSO:
1036                 rc = ethtool_set_gso(dev, useraddr);
1037                 break;
1038         case ETHTOOL_GFLAGS:
1039                 rc = ethtool_get_value(dev, useraddr, ethcmd,
1040                                        dev->ethtool_ops->get_flags);
1041                 break;
1042         case ETHTOOL_SFLAGS:
1043                 rc = ethtool_set_value(dev, useraddr,
1044                                        dev->ethtool_ops->set_flags);
1045                 break;
1046         case ETHTOOL_GPFLAGS:
1047                 rc = ethtool_get_value(dev, useraddr, ethcmd,
1048                                        dev->ethtool_ops->get_priv_flags);
1049                 break;
1050         case ETHTOOL_SPFLAGS:
1051                 rc = ethtool_set_value(dev, useraddr,
1052                                        dev->ethtool_ops->set_priv_flags);
1053                 break;
1054         case ETHTOOL_GRXFH:
1055                 rc = ethtool_get_rxhash(dev, useraddr);
1056                 break;
1057         case ETHTOOL_SRXFH:
1058                 rc = ethtool_set_rxhash(dev, useraddr);
1059                 break;
1060         case ETHTOOL_GGRO:
1061                 rc = ethtool_get_gro(dev, useraddr);
1062                 break;
1063         case ETHTOOL_SGRO:
1064                 rc = ethtool_set_gro(dev, useraddr);
1065                 break;
1066         default:
1067                 rc = -EOPNOTSUPP;
1068         }
1069
1070         if (dev->ethtool_ops->complete)
1071                 dev->ethtool_ops->complete(dev);
1072
1073         if (old_features != dev->features)
1074                 netdev_features_change(dev);
1075
1076         return rc;
1077 }
1078
1079 EXPORT_SYMBOL(ethtool_op_get_link);
1080 EXPORT_SYMBOL(ethtool_op_get_sg);
1081 EXPORT_SYMBOL(ethtool_op_get_tso);
1082 EXPORT_SYMBOL(ethtool_op_get_tx_csum);
1083 EXPORT_SYMBOL(ethtool_op_set_sg);
1084 EXPORT_SYMBOL(ethtool_op_set_tso);
1085 EXPORT_SYMBOL(ethtool_op_set_tx_csum);
1086 EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
1087 EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
1088 EXPORT_SYMBOL(ethtool_op_set_ufo);
1089 EXPORT_SYMBOL(ethtool_op_get_ufo);
1090 EXPORT_SYMBOL(ethtool_op_set_flags);
1091 EXPORT_SYMBOL(ethtool_op_get_flags);