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_get_regs(struct net_device *dev, char __user *useraddr)
 213 {
 214         struct ethtool_regs regs;
 215         const struct ethtool_ops *ops = dev->ethtool_ops;
 216         void *regbuf;
 217         int reglen, ret;
 218
 219         if (!ops->get_regs || !ops->get_regs_len)
 220                 return -EOPNOTSUPP;
 221
 222         if (copy_from_user(&regs, useraddr, sizeof(regs)))
 223                 return -EFAULT;
 224
 225         reglen = ops->get_regs_len(dev);
 226         if (regs.len > reglen)
 227                 regs.len = reglen;
 228
 229         regbuf = kmalloc(reglen, GFP_USER);
 230         if (!regbuf)
 231                 return -ENOMEM;
 232
 233         ops->get_regs(dev, &regs, regbuf);
 234
 235         ret = -EFAULT;
 236         if (copy_to_user(useraddr, &regs, sizeof(regs)))
 237                 goto out;
 238         useraddr += offsetof(struct ethtool_regs, data);
 239         if (copy_to_user(useraddr, regbuf, regs.len))
 240                 goto out;
 241         ret = 0;
 242
 243  out:
 244         kfree(regbuf);
 245         return ret;
 246 }
 247
 248 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
 249 {
 250         struct ethtool_wolinfo wol = { ETHTOOL_GWOL };
 251
 252         if (!dev->ethtool_ops->get_wol)
 253                 return -EOPNOTSUPP;
 254
 255         dev->ethtool_ops->get_wol(dev, &wol);
 256
 257         if (copy_to_user(useraddr, &wol, sizeof(wol)))
 258                 return -EFAULT;
 259         return 0;
 260 }
 261
 262 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
 263 {
 264         struct ethtool_wolinfo wol;
 265
 266         if (!dev->ethtool_ops->set_wol)
 267                 return -EOPNOTSUPP;
 268
 269         if (copy_from_user(&wol, useraddr, sizeof(wol)))
 270                 return -EFAULT;
 271
 272         return dev->ethtool_ops->set_wol(dev, &wol);
 273 }
 274
 275 static int ethtool_nway_reset(struct net_device *dev)
 276 {
 277         if (!dev->ethtool_ops->nway_reset)
 278                 return -EOPNOTSUPP;
 279
 280         return dev->ethtool_ops->nway_reset(dev);
 281 }
 282
 283 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
 284 {
 285         struct ethtool_eeprom eeprom;
 286         const struct ethtool_ops *ops = dev->ethtool_ops;
 287         void __user *userbuf = useraddr + sizeof(eeprom);
 288         u32 bytes_remaining;
 289         u8 *data;
 290         int ret = 0;
 291
 292         if (!ops->get_eeprom || !ops->get_eeprom_len)
 293                 return -EOPNOTSUPP;
 294
 295         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
 296                 return -EFAULT;
 297
 298         /* Check for wrap and zero */
 299         if (eeprom.offset + eeprom.len <= eeprom.offset)
 300                 return -EINVAL;
 301
 302         /* Check for exceeding total eeprom len */
 303         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
 304                 return -EINVAL;
 305
 306         data = kmalloc(PAGE_SIZE, GFP_USER);
 307         if (!data)
 308                 return -ENOMEM;
 309
 310         bytes_remaining = eeprom.len;
 311         while (bytes_remaining > 0) {
 312                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
 313
 314                 ret = ops->get_eeprom(dev, &eeprom, data);
 315                 if (ret)
 316                         break;
 317                 if (copy_to_user(userbuf, data, eeprom.len)) {
 318                         ret = -EFAULT;
 319                         break;
 320                 }
 321                 userbuf += eeprom.len;
 322                 eeprom.offset += eeprom.len;
 323                 bytes_remaining -= eeprom.len;
 324         }
 325
 326         kfree(data);
 327         return ret;
 328 }
 329
 330 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
 331 {
 332         struct ethtool_eeprom eeprom;
 333         const struct ethtool_ops *ops = dev->ethtool_ops;
 334         void __user *userbuf = useraddr + sizeof(eeprom);
 335         u32 bytes_remaining;
 336         u8 *data;
 337         int ret = 0;
 338
 339         if (!ops->set_eeprom || !ops->get_eeprom_len)
 340                 return -EOPNOTSUPP;
 341
 342         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
 343                 return -EFAULT;
 344
 345         /* Check for wrap and zero */
 346         if (eeprom.offset + eeprom.len <= eeprom.offset)
 347                 return -EINVAL;
 348
 349         /* Check for exceeding total eeprom len */
 350         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
 351                 return -EINVAL;
 352
 353         data = kmalloc(PAGE_SIZE, GFP_USER);
 354         if (!data)
 355                 return -ENOMEM;
 356
 357         bytes_remaining = eeprom.len;
 358         while (bytes_remaining > 0) {
 359                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
 360
 361                 if (copy_from_user(data, userbuf, eeprom.len)) {
 362                         ret = -EFAULT;
 363                         break;
 364                 }
 365                 ret = ops->set_eeprom(dev, &eeprom, data);
 366                 if (ret)
 367                         break;
 368                 userbuf += eeprom.len;
 369                 eeprom.offset += eeprom.len;
 370                 bytes_remaining -= eeprom.len;
 371         }
 372
 373         kfree(data);
 374         return ret;
 375 }
 376
 377 static int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr)
 378 {
 379         struct ethtool_coalesce coalesce = { ETHTOOL_GCOALESCE };
 380
 381         if (!dev->ethtool_ops->get_coalesce)
 382                 return -EOPNOTSUPP;
 383
 384         dev->ethtool_ops->get_coalesce(dev, &coalesce);
 385
 386         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
 387                 return -EFAULT;
 388         return 0;
 389 }
 390
 391 static int ethtool_set_coalesce(struct net_device *dev, void __user *useraddr)
 392 {
 393         struct ethtool_coalesce coalesce;
 394
 395         if (!dev->ethtool_ops->set_coalesce)
 396                 return -EOPNOTSUPP;
 397
 398         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
 399                 return -EFAULT;
 400
 401         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
 402 }
 403
 404 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
 405 {
 406         struct ethtool_ringparam ringparam = { ETHTOOL_GRINGPARAM };
 407
 408         if (!dev->ethtool_ops->get_ringparam)
 409                 return -EOPNOTSUPP;
 410
 411         dev->ethtool_ops->get_ringparam(dev, &ringparam);
 412
 413         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
 414                 return -EFAULT;
 415         return 0;
 416 }
 417
 418 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
 419 {
 420         struct ethtool_ringparam ringparam;
 421
 422         if (!dev->ethtool_ops->set_ringparam)
 423                 return -EOPNOTSUPP;
 424
 425         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
 426                 return -EFAULT;
 427
 428         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
 429 }
 430
 431 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
 432 {
 433         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
 434
 435         if (!dev->ethtool_ops->get_pauseparam)
 436                 return -EOPNOTSUPP;
 437
 438         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
 439
 440         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
 441                 return -EFAULT;
 442         return 0;
 443 }
 444
 445 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
 446 {
 447         struct ethtool_pauseparam pauseparam;
 448
 449         if (!dev->ethtool_ops->set_pauseparam)
 450                 return -EOPNOTSUPP;
 451
 452         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
 453                 return -EFAULT;
 454
 455         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
 456 }
 457
 458 static int __ethtool_set_sg(struct net_device *dev, u32 data)
 459 {
 460         int err;
 461
 462         if (!data && dev->ethtool_ops->set_tso) {
 463                 err = dev->ethtool_ops->set_tso(dev, 0);
 464                 if (err)
 465                         return err;
 466         }
 467
 468         if (!data && dev->ethtool_ops->set_ufo) {
 469                 err = dev->ethtool_ops->set_ufo(dev, 0);
 470                 if (err)
 471                         return err;
 472         }
 473         return dev->ethtool_ops->set_sg(dev, data);
 474 }
 475
 476 static int ethtool_set_tx_csum(struct net_device *dev, char __user *useraddr)
 477 {
 478         struct ethtool_value edata;
 479         int err;
 480
 481         if (!dev->ethtool_ops->set_tx_csum)
 482                 return -EOPNOTSUPP;
 483
 484         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 485                 return -EFAULT;
 486
 487         if (!edata.data && dev->ethtool_ops->set_sg) {
 488                 err = __ethtool_set_sg(dev, 0);
 489                 if (err)
 490                         return err;
 491         }
 492
 493         return dev->ethtool_ops->set_tx_csum(dev, edata.data);
 494 }
 495
 496 static int ethtool_set_sg(struct net_device *dev, char __user *useraddr)
 497 {
 498         struct ethtool_value edata;
 499
 500         if (!dev->ethtool_ops->set_sg)
 501                 return -EOPNOTSUPP;
 502
 503         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 504                 return -EFAULT;
 505
 506         if (edata.data &&
 507             !(dev->features & NETIF_F_ALL_CSUM))
 508                 return -EINVAL;
 509
 510         return __ethtool_set_sg(dev, edata.data);
 511 }
 512
 513 static int ethtool_set_tso(struct net_device *dev, char __user *useraddr)
 514 {
 515         struct ethtool_value edata;
 516
 517         if (!dev->ethtool_ops->set_tso)
 518                 return -EOPNOTSUPP;
 519
 520         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 521                 return -EFAULT;
 522
 523         if (edata.data && !(dev->features & NETIF_F_SG))
 524                 return -EINVAL;
 525
 526         return dev->ethtool_ops->set_tso(dev, edata.data);
 527 }
 528
 529 static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
 530 {
 531         struct ethtool_value edata;
 532
 533         if (!dev->ethtool_ops->set_ufo)
 534                 return -EOPNOTSUPP;
 535         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 536                 return -EFAULT;
 537         if (edata.data && !(dev->features & NETIF_F_SG))
 538                 return -EINVAL;
 539         if (edata.data && !(dev->features & NETIF_F_HW_CSUM))
 540                 return -EINVAL;
 541         return dev->ethtool_ops->set_ufo(dev, edata.data);
 542 }
 543
 544 static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
 545 {
 546         struct ethtool_value edata = { ETHTOOL_GGSO };
 547
 548         edata.data = dev->features & NETIF_F_GSO;
 549         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 550                  return -EFAULT;
 551         return 0;
 552 }
 553
 554 static int ethtool_set_gso(struct net_device *dev, char __user *useraddr)
 555 {
 556         struct ethtool_value edata;
 557
 558         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 559                 return -EFAULT;
 560         if (edata.data)
 561                 dev->features |= NETIF_F_GSO;
 562         else
 563                 dev->features &= ~NETIF_F_GSO;
 564         return 0;
 565 }
 566
 567 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 568 {
 569         struct ethtool_test test;
 570         const struct ethtool_ops *ops = dev->ethtool_ops;
 571         u64 *data;
 572         int ret, test_len;
 573
 574         if (!ops->self_test)
 575                 return -EOPNOTSUPP;
 576         if (!ops->get_sset_count && !ops->self_test_count)
 577                 return -EOPNOTSUPP;
 578
 579         if (ops->get_sset_count)
 580                 test_len = ops->get_sset_count(dev, ETH_SS_TEST);
 581         else
 582                 /* code path for obsolete hook */
 583                 test_len = ops->self_test_count(dev);
 584         if (test_len < 0)
 585                 return test_len;
 586         WARN_ON(test_len == 0);
 587
 588         if (copy_from_user(&test, useraddr, sizeof(test)))
 589                 return -EFAULT;
 590
 591         test.len = test_len;
 592         data = kmalloc(test_len * sizeof(u64), GFP_USER);
 593         if (!data)
 594                 return -ENOMEM;
 595
 596         ops->self_test(dev, &test, data);
 597
 598         ret = -EFAULT;
 599         if (copy_to_user(useraddr, &test, sizeof(test)))
 600                 goto out;
 601         useraddr += sizeof(test);
 602         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
 603                 goto out;
 604         ret = 0;
 605
 606  out:
 607         kfree(data);
 608         return ret;
 609 }
 610
 611 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 612 {
 613         struct ethtool_gstrings gstrings;
 614         const struct ethtool_ops *ops = dev->ethtool_ops;
 615         u8 *data;
 616         int ret;
 617
 618         if (!ops->get_strings)
 619                 return -EOPNOTSUPP;
 620
 621         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
 622                 return -EFAULT;
 623
 624         if (ops->get_sset_count) {
 625                 ret = ops->get_sset_count(dev, gstrings.string_set);
 626                 if (ret < 0)
 627                         return ret;
 628
 629                 gstrings.len = ret;
 630         } else {
 631                 /* code path for obsolete hooks */
 632
 633                 switch (gstrings.string_set) {
 634                 case ETH_SS_TEST:
 635                         if (!ops->self_test_count)
 636                                 return -EOPNOTSUPP;
 637                         gstrings.len = ops->self_test_count(dev);
 638                         break;
 639                 case ETH_SS_STATS:
 640                         if (!ops->get_stats_count)
 641                                 return -EOPNOTSUPP;
 642                         gstrings.len = ops->get_stats_count(dev);
 643                         break;
 644                 default:
 645                         return -EINVAL;
 646                 }
 647         }
 648
 649         data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
 650         if (!data)
 651                 return -ENOMEM;
 652
 653         ops->get_strings(dev, gstrings.string_set, data);
 654
 655         ret = -EFAULT;
 656         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
 657                 goto out;
 658         useraddr += sizeof(gstrings);
 659         if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
 660                 goto out;
 661         ret = 0;
 662
 663  out:
 664         kfree(data);
 665         return ret;
 666 }
 667
 668 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 669 {
 670         struct ethtool_value id;
 671
 672         if (!dev->ethtool_ops->phys_id)
 673                 return -EOPNOTSUPP;
 674
 675         if (copy_from_user(&id, useraddr, sizeof(id)))
 676                 return -EFAULT;
 677
 678         return dev->ethtool_ops->phys_id(dev, id.data);
 679 }
 680
 681 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
 682 {
 683         struct ethtool_stats stats;
 684         const struct ethtool_ops *ops = dev->ethtool_ops;
 685         u64 *data;
 686         int ret, n_stats;
 687
 688         if (!ops->get_ethtool_stats)
 689                 return -EOPNOTSUPP;
 690         if (!ops->get_sset_count && !ops->get_stats_count)
 691                 return -EOPNOTSUPP;
 692
 693         if (ops->get_sset_count)
 694                 n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
 695         else
 696                 /* code path for obsolete hook */
 697                 n_stats = ops->get_stats_count(dev);
 698         if (n_stats < 0)
 699                 return n_stats;
 700         WARN_ON(n_stats == 0);
 701
 702         if (copy_from_user(&stats, useraddr, sizeof(stats)))
 703                 return -EFAULT;
 704
 705         stats.n_stats = n_stats;
 706         data = kmalloc(n_stats * sizeof(u64), GFP_USER);
 707         if (!data)
 708                 return -ENOMEM;
 709
 710         ops->get_ethtool_stats(dev, &stats, data);
 711
 712         ret = -EFAULT;
 713         if (copy_to_user(useraddr, &stats, sizeof(stats)))
 714                 goto out;
 715         useraddr += sizeof(stats);
 716         if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
 717                 goto out;
 718         ret = 0;
 719
 720  out:
 721         kfree(data);
 722         return ret;
 723 }
 724
 725 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
 726 {
 727         struct ethtool_perm_addr epaddr;
 728
 729         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
 730                 return -EFAULT;
 731
 732         if (epaddr.size < dev->addr_len)
 733                 return -ETOOSMALL;
 734         epaddr.size = dev->addr_len;
 735
 736         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
 737                 return -EFAULT;
 738         useraddr += sizeof(epaddr);
 739         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
 740                 return -EFAULT;
 741         return 0;
 742 }
 743
 744 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
 745                              u32 cmd, u32 (*actor)(struct net_device *))
 746 {
 747         struct ethtool_value edata = { cmd };
 748
 749         if (!actor)
 750                 return -EOPNOTSUPP;
 751
 752         edata.data = actor(dev);
 753
 754         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 755                 return -EFAULT;
 756         return 0;
 757 }
 758
 759 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
 760                              void (*actor)(struct net_device *, u32))
 761 {
 762         struct ethtool_value edata;
 763
 764         if (!actor)
 765                 return -EOPNOTSUPP;
 766
 767         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 768                 return -EFAULT;
 769
 770         actor(dev, edata.data);
 771         return 0;
 772 }
 773
 774 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
 775                              int (*actor)(struct net_device *, u32))
 776 {
 777         struct ethtool_value edata;
 778
 779         if (!actor)
 780                 return -EOPNOTSUPP;
 781
 782         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 783                 return -EFAULT;
 784
 785         return actor(dev, edata.data);
 786 }
 787
 788 /* The main entry point in this file.  Called from net/core/dev.c */
 789
 790 int dev_ethtool(struct net *net, struct ifreq *ifr)
 791 {
 792         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
 793         void __user *useraddr = ifr->ifr_data;
 794         u32 ethcmd;
 795         int rc;
 796         unsigned long old_features;
 797
 798         if (!dev || !netif_device_present(dev))
 799                 return -ENODEV;
 800
 801         if (!dev->ethtool_ops)
 802                 return -EOPNOTSUPP;
 803
 804         if (copy_from_user(&ethcmd, useraddr, sizeof (ethcmd)))
 805                 return -EFAULT;
 806
 807         /* Allow some commands to be done by anyone */
 808         switch(ethcmd) {
 809         case ETHTOOL_GDRVINFO:
 810         case ETHTOOL_GMSGLVL:
 811         case ETHTOOL_GCOALESCE:
 812         case ETHTOOL_GRINGPARAM:
 813         case ETHTOOL_GPAUSEPARAM:
 814         case ETHTOOL_GRXCSUM:
 815         case ETHTOOL_GTXCSUM:
 816         case ETHTOOL_GSG:
 817         case ETHTOOL_GSTRINGS:
 818         case ETHTOOL_GTSO:
 819         case ETHTOOL_GPERMADDR:
 820         case ETHTOOL_GUFO:
 821         case ETHTOOL_GGSO:
 822         case ETHTOOL_GFLAGS:
 823         case ETHTOOL_GPFLAGS:
 824                 break;
 825         default:
 826                 if (!capable(CAP_NET_ADMIN))
 827                         return -EPERM;
 828         }
 829
 830         if (dev->ethtool_ops->begin)
 831                 if ((rc = dev->ethtool_ops->begin(dev)) < 0)
 832                         return rc;
 833
 834         old_features = dev->features;
 835
 836         switch (ethcmd) {
 837         case ETHTOOL_GSET:
 838                 rc = ethtool_get_settings(dev, useraddr);
 839                 break;
 840         case ETHTOOL_SSET:
 841                 rc = ethtool_set_settings(dev, useraddr);
 842                 break;
 843         case ETHTOOL_GDRVINFO:
 844                 rc = ethtool_get_drvinfo(dev, useraddr);
 845                 break;
 846         case ETHTOOL_GREGS:
 847                 rc = ethtool_get_regs(dev, useraddr);
 848                 break;
 849         case ETHTOOL_GWOL:
 850                 rc = ethtool_get_wol(dev, useraddr);
 851                 break;
 852         case ETHTOOL_SWOL:
 853                 rc = ethtool_set_wol(dev, useraddr);
 854                 break;
 855         case ETHTOOL_GMSGLVL:
 856                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 857                                        dev->ethtool_ops->get_msglevel);
 858                 break;
 859         case ETHTOOL_SMSGLVL:
 860                 rc = ethtool_set_value_void(dev, useraddr,
 861                                        dev->ethtool_ops->set_msglevel);
 862                 break;
 863         case ETHTOOL_NWAY_RST:
 864                 rc = ethtool_nway_reset(dev);
 865                 break;
 866         case ETHTOOL_GLINK:
 867                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 868                                        dev->ethtool_ops->get_link);
 869                 break;
 870         case ETHTOOL_GEEPROM:
 871                 rc = ethtool_get_eeprom(dev, useraddr);
 872                 break;
 873         case ETHTOOL_SEEPROM:
 874                 rc = ethtool_set_eeprom(dev, useraddr);
 875                 break;
 876         case ETHTOOL_GCOALESCE:
 877                 rc = ethtool_get_coalesce(dev, useraddr);
 878                 break;
 879         case ETHTOOL_SCOALESCE:
 880                 rc = ethtool_set_coalesce(dev, useraddr);
 881                 break;
 882         case ETHTOOL_GRINGPARAM:
 883                 rc = ethtool_get_ringparam(dev, useraddr);
 884                 break;
 885         case ETHTOOL_SRINGPARAM:
 886                 rc = ethtool_set_ringparam(dev, useraddr);
 887                 break;
 888         case ETHTOOL_GPAUSEPARAM:
 889                 rc = ethtool_get_pauseparam(dev, useraddr);
 890                 break;
 891         case ETHTOOL_SPAUSEPARAM:
 892                 rc = ethtool_set_pauseparam(dev, useraddr);
 893                 break;
 894         case ETHTOOL_GRXCSUM:
 895                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 896                                        dev->ethtool_ops->get_rx_csum);
 897                 break;
 898         case ETHTOOL_SRXCSUM:
 899                 rc = ethtool_set_value(dev, useraddr,
 900                                        dev->ethtool_ops->set_rx_csum);
 901                 break;
 902         case ETHTOOL_GTXCSUM:
 903                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 904                                        (dev->ethtool_ops->get_tx_csum ?
 905                                         dev->ethtool_ops->get_tx_csum :
 906                                         ethtool_op_get_tx_csum));
 907                 break;
 908         case ETHTOOL_STXCSUM:
 909                 rc = ethtool_set_tx_csum(dev, useraddr);
 910                 break;
 911         case ETHTOOL_GSG:
 912                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 913                                        (dev->ethtool_ops->get_sg ?
 914                                         dev->ethtool_ops->get_sg :
 915                                         ethtool_op_get_sg));
 916                 break;
 917         case ETHTOOL_SSG:
 918                 rc = ethtool_set_sg(dev, useraddr);
 919                 break;
 920         case ETHTOOL_GTSO:
 921                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 922                                        (dev->ethtool_ops->get_tso ?
 923                                         dev->ethtool_ops->get_tso :
 924                                         ethtool_op_get_tso));
 925                 break;
 926         case ETHTOOL_STSO:
 927                 rc = ethtool_set_tso(dev, useraddr);
 928                 break;
 929         case ETHTOOL_TEST:
 930                 rc = ethtool_self_test(dev, useraddr);
 931                 break;
 932         case ETHTOOL_GSTRINGS:
 933                 rc = ethtool_get_strings(dev, useraddr);
 934                 break;
 935         case ETHTOOL_PHYS_ID:
 936                 rc = ethtool_phys_id(dev, useraddr);
 937                 break;
 938         case ETHTOOL_GSTATS:
 939                 rc = ethtool_get_stats(dev, useraddr);
 940                 break;
 941         case ETHTOOL_GPERMADDR:
 942                 rc = ethtool_get_perm_addr(dev, useraddr);
 943                 break;
 944         case ETHTOOL_GUFO:
 945                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 946                                        (dev->ethtool_ops->get_ufo ?
 947                                         dev->ethtool_ops->get_ufo :
 948                                         ethtool_op_get_ufo));
 949                 break;
 950         case ETHTOOL_SUFO:
 951                 rc = ethtool_set_ufo(dev, useraddr);
 952                 break;
 953         case ETHTOOL_GGSO:
 954                 rc = ethtool_get_gso(dev, useraddr);
 955                 break;
 956         case ETHTOOL_SGSO:
 957                 rc = ethtool_set_gso(dev, useraddr);
 958                 break;
 959         case ETHTOOL_GFLAGS:
 960                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 961                                        dev->ethtool_ops->get_flags);
 962                 break;
 963         case ETHTOOL_SFLAGS:
 964                 rc = ethtool_set_value(dev, useraddr,
 965                                        dev->ethtool_ops->set_flags);
 966                 break;
 967         case ETHTOOL_GPFLAGS:
 968                 rc = ethtool_get_value(dev, useraddr, ethcmd,
 969                                        dev->ethtool_ops->get_priv_flags);
 970                 break;
 971         case ETHTOOL_SPFLAGS:
 972                 rc = ethtool_set_value(dev, useraddr,
 973                                        dev->ethtool_ops->set_priv_flags);
 974                 break;
 975         default:
 976                 rc = -EOPNOTSUPP;
 977         }
 978
 979         if (dev->ethtool_ops->complete)
 980                 dev->ethtool_ops->complete(dev);
 981
 982         if (old_features != dev->features)
 983                 netdev_features_change(dev);
 984
 985         return rc;
 986 }
 987
 988 EXPORT_SYMBOL(ethtool_op_get_link);
 989 EXPORT_SYMBOL(ethtool_op_get_sg);
 990 EXPORT_SYMBOL(ethtool_op_get_tso);
 991 EXPORT_SYMBOL(ethtool_op_get_tx_csum);
 992 EXPORT_SYMBOL(ethtool_op_set_sg);
 993 EXPORT_SYMBOL(ethtool_op_set_tso);
 994 EXPORT_SYMBOL(ethtool_op_set_tx_csum);
 995 EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
 996 EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
 997 EXPORT_SYMBOL(ethtool_op_set_ufo);
 998 EXPORT_SYMBOL(ethtool_op_get_ufo);
 999 EXPORT_SYMBOL(ethtool_op_set_flags);
1000 EXPORT_SYMBOL(ethtool_op_get_flags);