net/wireless/util.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Wireless utility functions
   4  *
   5  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2017       Intel Deutschland GmbH
   8  * Copyright (C) 2018-2022 Intel Corporation
   9  */
  10 #include <linux/export.h>
  11 #include <linux/bitops.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/slab.h>
  14 #include <linux/ieee80211.h>
  15 #include <net/cfg80211.h>
  16 #include <net/ip.h>
  17 #include <net/dsfield.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/mpls.h>
  20 #include <linux/gcd.h>
  21 #include <linux/bitfield.h>
  22 #include <linux/nospec.h>
  23 #include "core.h"
  24 #include "rdev-ops.h"
  25
  26
  27 const struct ieee80211_rate *
  28 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  29                             u32 basic_rates, int bitrate)
  30 {
  31         struct ieee80211_rate *result = &sband->bitrates[0];
  32         int i;
  33
  34         for (i = 0; i < sband->n_bitrates; i++) {
  35                 if (!(basic_rates & BIT(i)))
  36                         continue;
  37                 if (sband->bitrates[i].bitrate > bitrate)
  38                         continue;
  39                 result = &sband->bitrates[i];
  40         }
  41
  42         return result;
  43 }
  44 EXPORT_SYMBOL(ieee80211_get_response_rate);
  45
  46 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  47                               enum nl80211_bss_scan_width scan_width)
  48 {
  49         struct ieee80211_rate *bitrates;
  50         u32 mandatory_rates = 0;
  51         enum ieee80211_rate_flags mandatory_flag;
  52         int i;
  53
  54         if (WARN_ON(!sband))
  55                 return 1;
  56
  57         if (sband->band == NL80211_BAND_2GHZ) {
  58                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  59                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  60                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  61                 else
  62                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  63         } else {
  64                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  65         }
  66
  67         bitrates = sband->bitrates;
  68         for (i = 0; i < sband->n_bitrates; i++)
  69                 if (bitrates[i].flags & mandatory_flag)
  70                         mandatory_rates |= BIT(i);
  71         return mandatory_rates;
  72 }
  73 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  74
  75 u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
  76 {
  77         /* see 802.11 17.3.8.3.2 and Annex J
  78          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  79         if (chan <= 0)
  80                 return 0; /* not supported */
  81         switch (band) {
  82         case NL80211_BAND_2GHZ:
  83         case NL80211_BAND_LC:
  84                 if (chan == 14)
  85                         return MHZ_TO_KHZ(2484);
  86                 else if (chan < 14)
  87                         return MHZ_TO_KHZ(2407 + chan * 5);
  88                 break;
  89         case NL80211_BAND_5GHZ:
  90                 if (chan >= 182 && chan <= 196)
  91                         return MHZ_TO_KHZ(4000 + chan * 5);
  92                 else
  93                         return MHZ_TO_KHZ(5000 + chan * 5);
  94                 break;
  95         case NL80211_BAND_6GHZ:
  96                 /* see 802.11ax D6.1 27.3.23.2 */
  97                 if (chan == 2)
  98                         return MHZ_TO_KHZ(5935);
  99                 if (chan <= 233)
 100                         return MHZ_TO_KHZ(5950 + chan * 5);
 101                 break;
 102         case NL80211_BAND_60GHZ:
 103                 if (chan < 7)
 104                         return MHZ_TO_KHZ(56160 + chan * 2160);
 105                 break;
 106         case NL80211_BAND_S1GHZ:
 107                 return 902000 + chan * 500;
 108         default:
 109                 ;
 110         }
 111         return 0; /* not supported */
 112 }
 113 EXPORT_SYMBOL(ieee80211_channel_to_freq_khz);
 114
 115 enum nl80211_chan_width
 116 ieee80211_s1g_channel_width(const struct ieee80211_channel *chan)
 117 {
 118         if (WARN_ON(!chan || chan->band != NL80211_BAND_S1GHZ))
 119                 return NL80211_CHAN_WIDTH_20_NOHT;
 120
 121         /*S1G defines a single allowed channel width per channel.
 122          * Extract that width here.
 123          */
 124         if (chan->flags & IEEE80211_CHAN_1MHZ)
 125                 return NL80211_CHAN_WIDTH_1;
 126         else if (chan->flags & IEEE80211_CHAN_2MHZ)
 127                 return NL80211_CHAN_WIDTH_2;
 128         else if (chan->flags & IEEE80211_CHAN_4MHZ)
 129                 return NL80211_CHAN_WIDTH_4;
 130         else if (chan->flags & IEEE80211_CHAN_8MHZ)
 131                 return NL80211_CHAN_WIDTH_8;
 132         else if (chan->flags & IEEE80211_CHAN_16MHZ)
 133                 return NL80211_CHAN_WIDTH_16;
 134
 135         pr_err("unknown channel width for channel at %dKHz?\n",
 136                ieee80211_channel_to_khz(chan));
 137
 138         return NL80211_CHAN_WIDTH_1;
 139 }
 140 EXPORT_SYMBOL(ieee80211_s1g_channel_width);
 141
 142 int ieee80211_freq_khz_to_channel(u32 freq)
 143 {
 144         /* TODO: just handle MHz for now */
 145         freq = KHZ_TO_MHZ(freq);
 146
 147         /* see 802.11 17.3.8.3.2 and Annex J */
 148         if (freq == 2484)
 149                 return 14;
 150         else if (freq < 2484)
 151                 return (freq - 2407) / 5;
 152         else if (freq >= 4910 && freq <= 4980)
 153                 return (freq - 4000) / 5;
 154         else if (freq < 5925)
 155                 return (freq - 5000) / 5;
 156         else if (freq == 5935)
 157                 return 2;
 158         else if (freq <= 45000) /* DMG band lower limit */
 159                 /* see 802.11ax D6.1 27.3.22.2 */
 160                 return (freq - 5950) / 5;
 161         else if (freq >= 58320 && freq <= 70200)
 162                 return (freq - 56160) / 2160;
 163         else
 164                 return 0;
 165 }
 166 EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
 167
 168 struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
 169                                                     u32 freq)
 170 {
 171         enum nl80211_band band;
 172         struct ieee80211_supported_band *sband;
 173         int i;
 174
 175         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 176                 sband = wiphy->bands[band];
 177
 178                 if (!sband)
 179                         continue;
 180
 181                 for (i = 0; i < sband->n_channels; i++) {
 182                         struct ieee80211_channel *chan = &sband->channels[i];
 183
 184                         if (ieee80211_channel_to_khz(chan) == freq)
 185                                 return chan;
 186                 }
 187         }
 188
 189         return NULL;
 190 }
 191 EXPORT_SYMBOL(ieee80211_get_channel_khz);
 192
 193 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 194 {
 195         int i, want;
 196
 197         switch (sband->band) {
 198         case NL80211_BAND_5GHZ:
 199         case NL80211_BAND_6GHZ:
 200                 want = 3;
 201                 for (i = 0; i < sband->n_bitrates; i++) {
 202                         if (sband->bitrates[i].bitrate == 60 ||
 203                             sband->bitrates[i].bitrate == 120 ||
 204                             sband->bitrates[i].bitrate == 240) {
 205                                 sband->bitrates[i].flags |=
 206                                         IEEE80211_RATE_MANDATORY_A;
 207                                 want--;
 208                         }
 209                 }
 210                 WARN_ON(want);
 211                 break;
 212         case NL80211_BAND_2GHZ:
 213         case NL80211_BAND_LC:
 214                 want = 7;
 215                 for (i = 0; i < sband->n_bitrates; i++) {
 216                         switch (sband->bitrates[i].bitrate) {
 217                         case 10:
 218                         case 20:
 219                         case 55:
 220                         case 110:
 221                                 sband->bitrates[i].flags |=
 222                                         IEEE80211_RATE_MANDATORY_B |
 223                                         IEEE80211_RATE_MANDATORY_G;
 224                                 want--;
 225                                 break;
 226                         case 60:
 227                         case 120:
 228                         case 240:
 229                                 sband->bitrates[i].flags |=
 230                                         IEEE80211_RATE_MANDATORY_G;
 231                                 want--;
 232                                 fallthrough;
 233                         default:
 234                                 sband->bitrates[i].flags |=
 235                                         IEEE80211_RATE_ERP_G;
 236                                 break;
 237                         }
 238                 }
 239                 WARN_ON(want != 0 && want != 3);
 240                 break;
 241         case NL80211_BAND_60GHZ:
 242                 /* check for mandatory HT MCS 1..4 */
 243                 WARN_ON(!sband->ht_cap.ht_supported);
 244                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 245                 break;
 246         case NL80211_BAND_S1GHZ:
 247                 /* Figure 9-589bd: 3 means unsupported, so != 3 means at least
 248                  * mandatory is ok.
 249                  */
 250                 WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
 251                 break;
 252         case NUM_NL80211_BANDS:
 253         default:
 254                 WARN_ON(1);
 255                 break;
 256         }
 257 }
 258
 259 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 260 {
 261         enum nl80211_band band;
 262
 263         for (band = 0; band < NUM_NL80211_BANDS; band++)
 264                 if (wiphy->bands[band])
 265                         set_mandatory_flags_band(wiphy->bands[band]);
 266 }
 267
 268 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 269 {
 270         int i;
 271         for (i = 0; i < wiphy->n_cipher_suites; i++)
 272                 if (cipher == wiphy->cipher_suites[i])
 273                         return true;
 274         return false;
 275 }
 276
 277 static bool
 278 cfg80211_igtk_cipher_supported(struct cfg80211_registered_device *rdev)
 279 {
 280         struct wiphy *wiphy = &rdev->wiphy;
 281         int i;
 282
 283         for (i = 0; i < wiphy->n_cipher_suites; i++) {
 284                 switch (wiphy->cipher_suites[i]) {
 285                 case WLAN_CIPHER_SUITE_AES_CMAC:
 286                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 287                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 288                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 289                         return true;
 290                 }
 291         }
 292
 293         return false;
 294 }
 295
 296 bool cfg80211_valid_key_idx(struct cfg80211_registered_device *rdev,
 297                             int key_idx, bool pairwise)
 298 {
 299         int max_key_idx;
 300
 301         if (pairwise)
 302                 max_key_idx = 3;
 303         else if (wiphy_ext_feature_isset(&rdev->wiphy,
 304                                          NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
 305                  wiphy_ext_feature_isset(&rdev->wiphy,
 306                                          NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
 307                 max_key_idx = 7;
 308         else if (cfg80211_igtk_cipher_supported(rdev))
 309                 max_key_idx = 5;
 310         else
 311                 max_key_idx = 3;
 312
 313         if (key_idx < 0 || key_idx > max_key_idx)
 314                 return false;
 315
 316         return true;
 317 }
 318
 319 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 320                                    struct key_params *params, int key_idx,
 321                                    bool pairwise, const u8 *mac_addr)
 322 {
 323         if (!cfg80211_valid_key_idx(rdev, key_idx, pairwise))
 324                 return -EINVAL;
 325
 326         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 327                 return -EINVAL;
 328
 329         if (pairwise && !mac_addr)
 330                 return -EINVAL;
 331
 332         switch (params->cipher) {
 333         case WLAN_CIPHER_SUITE_TKIP:
 334                 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
 335                 if ((pairwise && key_idx) ||
 336                     params->mode != NL80211_KEY_RX_TX)
 337                         return -EINVAL;
 338                 break;
 339         case WLAN_CIPHER_SUITE_CCMP:
 340         case WLAN_CIPHER_SUITE_CCMP_256:
 341         case WLAN_CIPHER_SUITE_GCMP:
 342         case WLAN_CIPHER_SUITE_GCMP_256:
 343                 /* IEEE802.11-2016 allows only 0 and - when supporting
 344                  * Extended Key ID - 1 as index for pairwise keys.
 345                  * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
 346                  * the driver supports Extended Key ID.
 347                  * @NL80211_KEY_SET_TX can't be set when installing and
 348                  * validating a key.
 349                  */
 350                 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
 351                     params->mode == NL80211_KEY_SET_TX)
 352                         return -EINVAL;
 353                 if (wiphy_ext_feature_isset(&rdev->wiphy,
 354                                             NL80211_EXT_FEATURE_EXT_KEY_ID)) {
 355                         if (pairwise && (key_idx < 0 || key_idx > 1))
 356                                 return -EINVAL;
 357                 } else if (pairwise && key_idx) {
 358                         return -EINVAL;
 359                 }
 360                 break;
 361         case WLAN_CIPHER_SUITE_AES_CMAC:
 362         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 363         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 364         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 365                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 366                 if (pairwise)
 367                         return -EINVAL;
 368                 if (key_idx < 4)
 369                         return -EINVAL;
 370                 break;
 371         case WLAN_CIPHER_SUITE_WEP40:
 372         case WLAN_CIPHER_SUITE_WEP104:
 373                 if (key_idx > 3)
 374                         return -EINVAL;
 375                 break;
 376         default:
 377                 break;
 378         }
 379
 380         switch (params->cipher) {
 381         case WLAN_CIPHER_SUITE_WEP40:
 382                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 383                         return -EINVAL;
 384                 break;
 385         case WLAN_CIPHER_SUITE_TKIP:
 386                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 387                         return -EINVAL;
 388                 break;
 389         case WLAN_CIPHER_SUITE_CCMP:
 390                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 391                         return -EINVAL;
 392                 break;
 393         case WLAN_CIPHER_SUITE_CCMP_256:
 394                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 395                         return -EINVAL;
 396                 break;
 397         case WLAN_CIPHER_SUITE_GCMP:
 398                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 399                         return -EINVAL;
 400                 break;
 401         case WLAN_CIPHER_SUITE_GCMP_256:
 402                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 403                         return -EINVAL;
 404                 break;
 405         case WLAN_CIPHER_SUITE_WEP104:
 406                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 407                         return -EINVAL;
 408                 break;
 409         case WLAN_CIPHER_SUITE_AES_CMAC:
 410                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 411                         return -EINVAL;
 412                 break;
 413         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 414                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 415                         return -EINVAL;
 416                 break;
 417         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 418                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 419                         return -EINVAL;
 420                 break;
 421         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 422                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 423                         return -EINVAL;
 424                 break;
 425         default:
 426                 /*
 427                  * We don't know anything about this algorithm,
 428                  * allow using it -- but the driver must check
 429                  * all parameters! We still check below whether
 430                  * or not the driver supports this algorithm,
 431                  * of course.
 432                  */
 433                 break;
 434         }
 435
 436         if (params->seq) {
 437                 switch (params->cipher) {
 438                 case WLAN_CIPHER_SUITE_WEP40:
 439                 case WLAN_CIPHER_SUITE_WEP104:
 440                         /* These ciphers do not use key sequence */
 441                         return -EINVAL;
 442                 case WLAN_CIPHER_SUITE_TKIP:
 443                 case WLAN_CIPHER_SUITE_CCMP:
 444                 case WLAN_CIPHER_SUITE_CCMP_256:
 445                 case WLAN_CIPHER_SUITE_GCMP:
 446                 case WLAN_CIPHER_SUITE_GCMP_256:
 447                 case WLAN_CIPHER_SUITE_AES_CMAC:
 448                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 449                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 450                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 451                         if (params->seq_len != 6)
 452                                 return -EINVAL;
 453                         break;
 454                 }
 455         }
 456
 457         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 458                 return -EINVAL;
 459
 460         return 0;
 461 }
 462
 463 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 464 {
 465         unsigned int hdrlen = 24;
 466
 467         if (ieee80211_is_ext(fc)) {
 468                 hdrlen = 4;
 469                 goto out;
 470         }
 471
 472         if (ieee80211_is_data(fc)) {
 473                 if (ieee80211_has_a4(fc))
 474                         hdrlen = 30;
 475                 if (ieee80211_is_data_qos(fc)) {
 476                         hdrlen += IEEE80211_QOS_CTL_LEN;
 477                         if (ieee80211_has_order(fc))
 478                                 hdrlen += IEEE80211_HT_CTL_LEN;
 479                 }
 480                 goto out;
 481         }
 482
 483         if (ieee80211_is_mgmt(fc)) {
 484                 if (ieee80211_has_order(fc))
 485                         hdrlen += IEEE80211_HT_CTL_LEN;
 486                 goto out;
 487         }
 488
 489         if (ieee80211_is_ctl(fc)) {
 490                 /*
 491                  * ACK and CTS are 10 bytes, all others 16. To see how
 492                  * to get this condition consider
 493                  *   subtype mask:   0b0000000011110000 (0x00F0)
 494                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 495                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 496                  *   bits that matter:         ^^^      (0x00E0)
 497                  *   value of those: 0b0000000011000000 (0x00C0)
 498                  */
 499                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 500                         hdrlen = 10;
 501                 else
 502                         hdrlen = 16;
 503         }
 504 out:
 505         return hdrlen;
 506 }
 507 EXPORT_SYMBOL(ieee80211_hdrlen);
 508
 509 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 510 {
 511         const struct ieee80211_hdr *hdr =
 512                         (const struct ieee80211_hdr *)skb->data;
 513         unsigned int hdrlen;
 514
 515         if (unlikely(skb->len < 10))
 516                 return 0;
 517         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 518         if (unlikely(hdrlen > skb->len))
 519                 return 0;
 520         return hdrlen;
 521 }
 522 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 523
 524 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 525 {
 526         int ae = flags & MESH_FLAGS_AE;
 527         /* 802.11-2012, 8.2.4.7.3 */
 528         switch (ae) {
 529         default:
 530         case 0:
 531                 return 6;
 532         case MESH_FLAGS_AE_A4:
 533                 return 12;
 534         case MESH_FLAGS_AE_A5_A6:
 535                 return 18;
 536         }
 537 }
 538
 539 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 540 {
 541         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 542 }
 543 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 544
 545 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 546                                   const u8 *addr, enum nl80211_iftype iftype,
 547                                   u8 data_offset, bool is_amsdu)
 548 {
 549         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 550         struct {
 551                 u8 hdr[ETH_ALEN] __aligned(2);
 552                 __be16 proto;
 553         } payload;
 554         struct ethhdr tmp;
 555         u16 hdrlen;
 556         u8 mesh_flags = 0;
 557
 558         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 559                 return -1;
 560
 561         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 562         if (skb->len < hdrlen)
 563                 return -1;
 564
 565         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 566          * header
 567          * IEEE 802.11 address fields:
 568          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 569          *   0     0   DA    SA    BSSID n/a
 570          *   0     1   DA    BSSID SA    n/a
 571          *   1     0   BSSID SA    DA    n/a
 572          *   1     1   RA    TA    DA    SA
 573          */
 574         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 575         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 576
 577         if (iftype == NL80211_IFTYPE_MESH_POINT &&
 578             skb_copy_bits(skb, hdrlen, &mesh_flags, 1) < 0)
 579                 return -1;
 580
 581         mesh_flags &= MESH_FLAGS_AE;
 582
 583         switch (hdr->frame_control &
 584                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 585         case cpu_to_le16(IEEE80211_FCTL_TODS):
 586                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 587                              iftype != NL80211_IFTYPE_AP_VLAN &&
 588                              iftype != NL80211_IFTYPE_P2P_GO))
 589                         return -1;
 590                 break;
 591         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 592                 if (unlikely(iftype != NL80211_IFTYPE_MESH_POINT &&
 593                              iftype != NL80211_IFTYPE_AP_VLAN &&
 594                              iftype != NL80211_IFTYPE_STATION))
 595                         return -1;
 596                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 597                         if (mesh_flags == MESH_FLAGS_AE_A4)
 598                                 return -1;
 599                         if (mesh_flags == MESH_FLAGS_AE_A5_A6 &&
 600                             skb_copy_bits(skb, hdrlen +
 601                                           offsetof(struct ieee80211s_hdr, eaddr1),
 602                                           tmp.h_dest, 2 * ETH_ALEN) < 0)
 603                                 return -1;
 604
 605                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 606                 }
 607                 break;
 608         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 609                 if ((iftype != NL80211_IFTYPE_STATION &&
 610                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 611                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 612                     (is_multicast_ether_addr(tmp.h_dest) &&
 613                      ether_addr_equal(tmp.h_source, addr)))
 614                         return -1;
 615                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 616                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 617                                 return -1;
 618                         if (mesh_flags == MESH_FLAGS_AE_A4 &&
 619                             skb_copy_bits(skb, hdrlen +
 620                                           offsetof(struct ieee80211s_hdr, eaddr1),
 621                                           tmp.h_source, ETH_ALEN) < 0)
 622                                 return -1;
 623                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 624                 }
 625                 break;
 626         case cpu_to_le16(0):
 627                 if (iftype != NL80211_IFTYPE_ADHOC &&
 628                     iftype != NL80211_IFTYPE_STATION &&
 629                     iftype != NL80211_IFTYPE_OCB)
 630                                 return -1;
 631                 break;
 632         }
 633
 634         if (likely(skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)) == 0 &&
 635                    ((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
 636                      payload.proto != htons(ETH_P_AARP) &&
 637                      payload.proto != htons(ETH_P_IPX)) ||
 638                     ether_addr_equal(payload.hdr, bridge_tunnel_header)))) {
 639                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 640                  * replace EtherType */
 641                 hdrlen += ETH_ALEN + 2;
 642                 tmp.h_proto = payload.proto;
 643                 skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
 644         } else {
 645                 tmp.h_proto = htons(skb->len - hdrlen);
 646         }
 647
 648         pskb_pull(skb, hdrlen);
 649
 650         if (!ehdr)
 651                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 652         memcpy(ehdr, &tmp, sizeof(tmp));
 653
 654         return 0;
 655 }
 656 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 657
 658 static void
 659 __frame_add_frag(struct sk_buff *skb, struct page *page,
 660                  void *ptr, int len, int size)
 661 {
 662         struct skb_shared_info *sh = skb_shinfo(skb);
 663         int page_offset;
 664
 665         get_page(page);
 666         page_offset = ptr - page_address(page);
 667         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 668 }
 669
 670 static void
 671 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 672                             int offset, int len)
 673 {
 674         struct skb_shared_info *sh = skb_shinfo(skb);
 675         const skb_frag_t *frag = &sh->frags[0];
 676         struct page *frag_page;
 677         void *frag_ptr;
 678         int frag_len, frag_size;
 679         int head_size = skb->len - skb->data_len;
 680         int cur_len;
 681
 682         frag_page = virt_to_head_page(skb->head);
 683         frag_ptr = skb->data;
 684         frag_size = head_size;
 685
 686         while (offset >= frag_size) {
 687                 offset -= frag_size;
 688                 frag_page = skb_frag_page(frag);
 689                 frag_ptr = skb_frag_address(frag);
 690                 frag_size = skb_frag_size(frag);
 691                 frag++;
 692         }
 693
 694         frag_ptr += offset;
 695         frag_len = frag_size - offset;
 696
 697         cur_len = min(len, frag_len);
 698
 699         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 700         len -= cur_len;
 701
 702         while (len > 0) {
 703                 frag_len = skb_frag_size(frag);
 704                 cur_len = min(len, frag_len);
 705                 __frame_add_frag(frame, skb_frag_page(frag),
 706                                  skb_frag_address(frag), cur_len, frag_len);
 707                 len -= cur_len;
 708                 frag++;
 709         }
 710 }
 711
 712 static struct sk_buff *
 713 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 714                        int offset, int len, bool reuse_frag)
 715 {
 716         struct sk_buff *frame;
 717         int cur_len = len;
 718
 719         if (skb->len - offset < len)
 720                 return NULL;
 721
 722         /*
 723          * When reusing framents, copy some data to the head to simplify
 724          * ethernet header handling and speed up protocol header processing
 725          * in the stack later.
 726          */
 727         if (reuse_frag)
 728                 cur_len = min_t(int, len, 32);
 729
 730         /*
 731          * Allocate and reserve two bytes more for payload
 732          * alignment since sizeof(struct ethhdr) is 14.
 733          */
 734         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 735         if (!frame)
 736                 return NULL;
 737
 738         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 739         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 740
 741         len -= cur_len;
 742         if (!len)
 743                 return frame;
 744
 745         offset += cur_len;
 746         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 747
 748         return frame;
 749 }
 750
 751 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 752                               const u8 *addr, enum nl80211_iftype iftype,
 753                               const unsigned int extra_headroom,
 754                               const u8 *check_da, const u8 *check_sa)
 755 {
 756         unsigned int hlen = ALIGN(extra_headroom, 4);
 757         struct sk_buff *frame = NULL;
 758         u16 ethertype;
 759         u8 *payload;
 760         int offset = 0, remaining;
 761         struct ethhdr eth;
 762         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 763         bool reuse_skb = false;
 764         bool last = false;
 765
 766         while (!last) {
 767                 unsigned int subframe_len;
 768                 int len;
 769                 u8 padding;
 770
 771                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 772                 len = ntohs(eth.h_proto);
 773                 subframe_len = sizeof(struct ethhdr) + len;
 774                 padding = (4 - subframe_len) & 0x3;
 775
 776                 /* the last MSDU has no padding */
 777                 remaining = skb->len - offset;
 778                 if (subframe_len > remaining)
 779                         goto purge;
 780                 /* mitigate A-MSDU aggregation injection attacks */
 781                 if (ether_addr_equal(eth.h_dest, rfc1042_header))
 782                         goto purge;
 783
 784                 offset += sizeof(struct ethhdr);
 785                 last = remaining <= subframe_len + padding;
 786
 787                 /* FIXME: should we really accept multicast DA? */
 788                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 789                      !ether_addr_equal(check_da, eth.h_dest)) ||
 790                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 791                         offset += len + padding;
 792                         continue;
 793                 }
 794
 795                 /* reuse skb for the last subframe */
 796                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 797                         skb_pull(skb, offset);
 798                         frame = skb;
 799                         reuse_skb = true;
 800                 } else {
 801                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 802                                                        reuse_frag);
 803                         if (!frame)
 804                                 goto purge;
 805
 806                         offset += len + padding;
 807                 }
 808
 809                 skb_reset_network_header(frame);
 810                 frame->dev = skb->dev;
 811                 frame->priority = skb->priority;
 812
 813                 payload = frame->data;
 814                 ethertype = (payload[6] << 8) | payload[7];
 815                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 816                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 817                            ether_addr_equal(payload, bridge_tunnel_header))) {
 818                         eth.h_proto = htons(ethertype);
 819                         skb_pull(frame, ETH_ALEN + 2);
 820                 }
 821
 822                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 823                 __skb_queue_tail(list, frame);
 824         }
 825
 826         if (!reuse_skb)
 827                 dev_kfree_skb(skb);
 828
 829         return;
 830
 831  purge:
 832         __skb_queue_purge(list);
 833         dev_kfree_skb(skb);
 834 }
 835 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 836
 837 /* Given a data frame determine the 802.1p/1d tag to use. */
 838 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 839                                     struct cfg80211_qos_map *qos_map)
 840 {
 841         unsigned int dscp;
 842         unsigned char vlan_priority;
 843         unsigned int ret;
 844
 845         /* skb->priority values from 256->263 are magic values to
 846          * directly indicate a specific 802.1d priority.  This is used
 847          * to allow 802.1d priority to be passed directly in from VLAN
 848          * tags, etc.
 849          */
 850         if (skb->priority >= 256 && skb->priority <= 263) {
 851                 ret = skb->priority - 256;
 852                 goto out;
 853         }
 854
 855         if (skb_vlan_tag_present(skb)) {
 856                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 857                         >> VLAN_PRIO_SHIFT;
 858                 if (vlan_priority > 0) {
 859                         ret = vlan_priority;
 860                         goto out;
 861                 }
 862         }
 863
 864         switch (skb->protocol) {
 865         case htons(ETH_P_IP):
 866                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 867                 break;
 868         case htons(ETH_P_IPV6):
 869                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 870                 break;
 871         case htons(ETH_P_MPLS_UC):
 872         case htons(ETH_P_MPLS_MC): {
 873                 struct mpls_label mpls_tmp, *mpls;
 874
 875                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 876                                           sizeof(*mpls), &mpls_tmp);
 877                 if (!mpls)
 878                         return 0;
 879
 880                 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 881                         >> MPLS_LS_TC_SHIFT;
 882                 goto out;
 883         }
 884         case htons(ETH_P_80221):
 885                 /* 802.21 is always network control traffic */
 886                 return 7;
 887         default:
 888                 return 0;
 889         }
 890
 891         if (qos_map) {
 892                 unsigned int i, tmp_dscp = dscp >> 2;
 893
 894                 for (i = 0; i < qos_map->num_des; i++) {
 895                         if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
 896                                 ret = qos_map->dscp_exception[i].up;
 897                                 goto out;
 898                         }
 899                 }
 900
 901                 for (i = 0; i < 8; i++) {
 902                         if (tmp_dscp >= qos_map->up[i].low &&
 903                             tmp_dscp <= qos_map->up[i].high) {
 904                                 ret = i;
 905                                 goto out;
 906                         }
 907                 }
 908         }
 909
 910         ret = dscp >> 5;
 911 out:
 912         return array_index_nospec(ret, IEEE80211_NUM_TIDS);
 913 }
 914 EXPORT_SYMBOL(cfg80211_classify8021d);
 915
 916 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
 917 {
 918         const struct cfg80211_bss_ies *ies;
 919
 920         ies = rcu_dereference(bss->ies);
 921         if (!ies)
 922                 return NULL;
 923
 924         return cfg80211_find_elem(id, ies->data, ies->len);
 925 }
 926 EXPORT_SYMBOL(ieee80211_bss_get_elem);
 927
 928 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 929 {
 930         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 931         struct net_device *dev = wdev->netdev;
 932         int i;
 933
 934         if (!wdev->connect_keys)
 935                 return;
 936
 937         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 938                 if (!wdev->connect_keys->params[i].cipher)
 939                         continue;
 940                 if (rdev_add_key(rdev, dev, -1, i, false, NULL,
 941                                  &wdev->connect_keys->params[i])) {
 942                         netdev_err(dev, "failed to set key %d\n", i);
 943                         continue;
 944                 }
 945                 if (wdev->connect_keys->def == i &&
 946                     rdev_set_default_key(rdev, dev, -1, i, true, true)) {
 947                         netdev_err(dev, "failed to set defkey %d\n", i);
 948                         continue;
 949                 }
 950         }
 951
 952         kfree_sensitive(wdev->connect_keys);
 953         wdev->connect_keys = NULL;
 954 }
 955
 956 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 957 {
 958         struct cfg80211_event *ev;
 959         unsigned long flags;
 960
 961         spin_lock_irqsave(&wdev->event_lock, flags);
 962         while (!list_empty(&wdev->event_list)) {
 963                 ev = list_first_entry(&wdev->event_list,
 964                                       struct cfg80211_event, list);
 965                 list_del(&ev->list);
 966                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 967
 968                 wdev_lock(wdev);
 969                 switch (ev->type) {
 970                 case EVENT_CONNECT_RESULT:
 971                         __cfg80211_connect_result(
 972                                 wdev->netdev,
 973                                 &ev->cr,
 974                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 975                         break;
 976                 case EVENT_ROAMED:
 977                         __cfg80211_roamed(wdev, &ev->rm);
 978                         break;
 979                 case EVENT_DISCONNECTED:
 980                         __cfg80211_disconnected(wdev->netdev,
 981                                                 ev->dc.ie, ev->dc.ie_len,
 982                                                 ev->dc.reason,
 983                                                 !ev->dc.locally_generated);
 984                         break;
 985                 case EVENT_IBSS_JOINED:
 986                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 987                                                ev->ij.channel);
 988                         break;
 989                 case EVENT_STOPPED:
 990                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 991                         break;
 992                 case EVENT_PORT_AUTHORIZED:
 993                         __cfg80211_port_authorized(wdev, ev->pa.bssid,
 994                                                    ev->pa.td_bitmap,
 995                                                    ev->pa.td_bitmap_len);
 996                         break;
 997                 }
 998                 wdev_unlock(wdev);
 999
1000                 kfree(ev);
1001
1002                 spin_lock_irqsave(&wdev->event_lock, flags);
1003         }
1004         spin_unlock_irqrestore(&wdev->event_lock, flags);
1005 }
1006
1007 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
1008 {
1009         struct wireless_dev *wdev;
1010
1011         lockdep_assert_held(&rdev->wiphy.mtx);
1012
1013         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
1014                 cfg80211_process_wdev_events(wdev);
1015 }
1016
1017 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
1018                           struct net_device *dev, enum nl80211_iftype ntype,
1019                           struct vif_params *params)
1020 {
1021         int err;
1022         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1023
1024         lockdep_assert_held(&rdev->wiphy.mtx);
1025
1026         /* don't support changing VLANs, you just re-create them */
1027         if (otype == NL80211_IFTYPE_AP_VLAN)
1028                 return -EOPNOTSUPP;
1029
1030         /* cannot change into P2P device or NAN */
1031         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1032             ntype == NL80211_IFTYPE_NAN)
1033                 return -EOPNOTSUPP;
1034
1035         if (!rdev->ops->change_virtual_intf ||
1036             !(rdev->wiphy.interface_modes & (1 << ntype)))
1037                 return -EOPNOTSUPP;
1038
1039         if (ntype != otype) {
1040                 /* if it's part of a bridge, reject changing type to station/ibss */
1041                 if (netif_is_bridge_port(dev) &&
1042                     (ntype == NL80211_IFTYPE_ADHOC ||
1043                      ntype == NL80211_IFTYPE_STATION ||
1044                      ntype == NL80211_IFTYPE_P2P_CLIENT))
1045                         return -EBUSY;
1046
1047                 dev->ieee80211_ptr->use_4addr = false;
1048                 wdev_lock(dev->ieee80211_ptr);
1049                 rdev_set_qos_map(rdev, dev, NULL);
1050                 wdev_unlock(dev->ieee80211_ptr);
1051
1052                 switch (otype) {
1053                 case NL80211_IFTYPE_AP:
1054                 case NL80211_IFTYPE_P2P_GO:
1055                         cfg80211_stop_ap(rdev, dev, -1, true);
1056                         break;
1057                 case NL80211_IFTYPE_ADHOC:
1058                         cfg80211_leave_ibss(rdev, dev, false);
1059                         break;
1060                 case NL80211_IFTYPE_STATION:
1061                 case NL80211_IFTYPE_P2P_CLIENT:
1062                         wdev_lock(dev->ieee80211_ptr);
1063                         cfg80211_disconnect(rdev, dev,
1064                                             WLAN_REASON_DEAUTH_LEAVING, true);
1065                         wdev_unlock(dev->ieee80211_ptr);
1066                         break;
1067                 case NL80211_IFTYPE_MESH_POINT:
1068                         /* mesh should be handled? */
1069                         break;
1070                 case NL80211_IFTYPE_OCB:
1071                         cfg80211_leave_ocb(rdev, dev);
1072                         break;
1073                 default:
1074                         break;
1075                 }
1076
1077                 cfg80211_process_rdev_events(rdev);
1078                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1079
1080                 memset(&dev->ieee80211_ptr->u, 0,
1081                        sizeof(dev->ieee80211_ptr->u));
1082                 memset(&dev->ieee80211_ptr->links, 0,
1083                        sizeof(dev->ieee80211_ptr->links));
1084         }
1085
1086         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1087
1088         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1089
1090         if (!err && params && params->use_4addr != -1)
1091                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1092
1093         if (!err) {
1094                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1095                 switch (ntype) {
1096                 case NL80211_IFTYPE_STATION:
1097                         if (dev->ieee80211_ptr->use_4addr)
1098                                 break;
1099                         fallthrough;
1100                 case NL80211_IFTYPE_OCB:
1101                 case NL80211_IFTYPE_P2P_CLIENT:
1102                 case NL80211_IFTYPE_ADHOC:
1103                         dev->priv_flags |= IFF_DONT_BRIDGE;
1104                         break;
1105                 case NL80211_IFTYPE_P2P_GO:
1106                 case NL80211_IFTYPE_AP:
1107                 case NL80211_IFTYPE_AP_VLAN:
1108                 case NL80211_IFTYPE_MESH_POINT:
1109                         /* bridging OK */
1110                         break;
1111                 case NL80211_IFTYPE_MONITOR:
1112                         /* monitor can't bridge anyway */
1113                         break;
1114                 case NL80211_IFTYPE_UNSPECIFIED:
1115                 case NUM_NL80211_IFTYPES:
1116                         /* not happening */
1117                         break;
1118                 case NL80211_IFTYPE_P2P_DEVICE:
1119                 case NL80211_IFTYPE_WDS:
1120                 case NL80211_IFTYPE_NAN:
1121                         WARN_ON(1);
1122                         break;
1123                 }
1124         }
1125
1126         if (!err && ntype != otype && netif_running(dev)) {
1127                 cfg80211_update_iface_num(rdev, ntype, 1);
1128                 cfg80211_update_iface_num(rdev, otype, -1);
1129         }
1130
1131         return err;
1132 }
1133
1134 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1135 {
1136         int modulation, streams, bitrate;
1137
1138         /* the formula below does only work for MCS values smaller than 32 */
1139         if (WARN_ON_ONCE(rate->mcs >= 32))
1140                 return 0;
1141
1142         modulation = rate->mcs & 7;
1143         streams = (rate->mcs >> 3) + 1;
1144
1145         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1146
1147         if (modulation < 4)
1148                 bitrate *= (modulation + 1);
1149         else if (modulation == 4)
1150                 bitrate *= (modulation + 2);
1151         else
1152                 bitrate *= (modulation + 3);
1153
1154         bitrate *= streams;
1155
1156         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1157                 bitrate = (bitrate / 9) * 10;
1158
1159         /* do NOT round down here */
1160         return (bitrate + 50000) / 100000;
1161 }
1162
1163 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1164 {
1165         static const u32 __mcs2bitrate[] = {
1166                 /* control PHY */
1167                 [0] =   275,
1168                 /* SC PHY */
1169                 [1] =  3850,
1170                 [2] =  7700,
1171                 [3] =  9625,
1172                 [4] = 11550,
1173                 [5] = 12512, /* 1251.25 mbps */
1174                 [6] = 15400,
1175                 [7] = 19250,
1176                 [8] = 23100,
1177                 [9] = 25025,
1178                 [10] = 30800,
1179                 [11] = 38500,
1180                 [12] = 46200,
1181                 /* OFDM PHY */
1182                 [13] =  6930,
1183                 [14] =  8662, /* 866.25 mbps */
1184                 [15] = 13860,
1185                 [16] = 17325,
1186                 [17] = 20790,
1187                 [18] = 27720,
1188                 [19] = 34650,
1189                 [20] = 41580,
1190                 [21] = 45045,
1191                 [22] = 51975,
1192                 [23] = 62370,
1193                 [24] = 67568, /* 6756.75 mbps */
1194                 /* LP-SC PHY */
1195                 [25] =  6260,
1196                 [26] =  8340,
1197                 [27] = 11120,
1198                 [28] = 12510,
1199                 [29] = 16680,
1200                 [30] = 22240,
1201                 [31] = 25030,
1202         };
1203
1204         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1205                 return 0;
1206
1207         return __mcs2bitrate[rate->mcs];
1208 }
1209
1210 static u32 cfg80211_calculate_bitrate_extended_sc_dmg(struct rate_info *rate)
1211 {
1212         static const u32 __mcs2bitrate[] = {
1213                 [6 - 6] = 26950, /* MCS 9.1 : 2695.0 mbps */
1214                 [7 - 6] = 50050, /* MCS 12.1 */
1215                 [8 - 6] = 53900,
1216                 [9 - 6] = 57750,
1217                 [10 - 6] = 63900,
1218                 [11 - 6] = 75075,
1219                 [12 - 6] = 80850,
1220         };
1221
1222         /* Extended SC MCS not defined for base MCS below 6 or above 12 */
1223         if (WARN_ON_ONCE(rate->mcs < 6 || rate->mcs > 12))
1224                 return 0;
1225
1226         return __mcs2bitrate[rate->mcs - 6];
1227 }
1228
1229 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1230 {
1231         static const u32 __mcs2bitrate[] = {
1232                 /* control PHY */
1233                 [0] =   275,
1234                 /* SC PHY */
1235                 [1] =  3850,
1236                 [2] =  7700,
1237                 [3] =  9625,
1238                 [4] = 11550,
1239                 [5] = 12512, /* 1251.25 mbps */
1240                 [6] = 13475,
1241                 [7] = 15400,
1242                 [8] = 19250,
1243                 [9] = 23100,
1244                 [10] = 25025,
1245                 [11] = 26950,
1246                 [12] = 30800,
1247                 [13] = 38500,
1248                 [14] = 46200,
1249                 [15] = 50050,
1250                 [16] = 53900,
1251                 [17] = 57750,
1252                 [18] = 69300,
1253                 [19] = 75075,
1254                 [20] = 80850,
1255         };
1256
1257         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1258                 return 0;
1259
1260         return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1261 }
1262
1263 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1264 {
1265         static const u32 base[4][12] = {
1266                 {   6500000,
1267                    13000000,
1268                    19500000,
1269                    26000000,
1270                    39000000,
1271                    52000000,
1272                    58500000,
1273                    65000000,
1274                    78000000,
1275                 /* not in the spec, but some devices use this: */
1276                    86700000,
1277                    97500000,
1278                   108300000,
1279                 },
1280                 {  13500000,
1281                    27000000,
1282                    40500000,
1283                    54000000,
1284                    81000000,
1285                   108000000,
1286                   121500000,
1287                   135000000,
1288                   162000000,
1289                   180000000,
1290                   202500000,
1291                   225000000,
1292                 },
1293                 {  29300000,
1294                    58500000,
1295                    87800000,
1296                   117000000,
1297                   175500000,
1298                   234000000,
1299                   263300000,
1300                   292500000,
1301                   351000000,
1302                   390000000,
1303                   438800000,
1304                   487500000,
1305                 },
1306                 {  58500000,
1307                   117000000,
1308                   175500000,
1309                   234000000,
1310                   351000000,
1311                   468000000,
1312                   526500000,
1313                   585000000,
1314                   702000000,
1315                   780000000,
1316                   877500000,
1317                   975000000,
1318                 },
1319         };
1320         u32 bitrate;
1321         int idx;
1322
1323         if (rate->mcs > 11)
1324                 goto warn;
1325
1326         switch (rate->bw) {
1327         case RATE_INFO_BW_160:
1328                 idx = 3;
1329                 break;
1330         case RATE_INFO_BW_80:
1331                 idx = 2;
1332                 break;
1333         case RATE_INFO_BW_40:
1334                 idx = 1;
1335                 break;
1336         case RATE_INFO_BW_5:
1337         case RATE_INFO_BW_10:
1338         default:
1339                 goto warn;
1340         case RATE_INFO_BW_20:
1341                 idx = 0;
1342         }
1343
1344         bitrate = base[idx][rate->mcs];
1345         bitrate *= rate->nss;
1346
1347         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1348                 bitrate = (bitrate / 9) * 10;
1349
1350         /* do NOT round down here */
1351         return (bitrate + 50000) / 100000;
1352  warn:
1353         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1354                   rate->bw, rate->mcs, rate->nss);
1355         return 0;
1356 }
1357
1358 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1359 {
1360 #define SCALE 6144
1361         u32 mcs_divisors[14] = {
1362                 102399, /* 16.666666... */
1363                  51201, /*  8.333333... */
1364                  34134, /*  5.555555... */
1365                  25599, /*  4.166666... */
1366                  17067, /*  2.777777... */
1367                  12801, /*  2.083333... */
1368                  11377, /*  1.851725... */
1369                  10239, /*  1.666666... */
1370                   8532, /*  1.388888... */
1371                   7680, /*  1.250000... */
1372                   6828, /*  1.111111... */
1373                   6144, /*  1.000000... */
1374                   5690, /*  0.926106... */
1375                   5120, /*  0.833333... */
1376         };
1377         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1378         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1379         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1380         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1381         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1382         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1383         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1384         u64 tmp;
1385         u32 result;
1386
1387         if (WARN_ON_ONCE(rate->mcs > 13))
1388                 return 0;
1389
1390         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1391                 return 0;
1392         if (WARN_ON_ONCE(rate->he_ru_alloc >
1393                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1394                 return 0;
1395         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1396                 return 0;
1397
1398         if (rate->bw == RATE_INFO_BW_160)
1399                 result = rates_160M[rate->he_gi];
1400         else if (rate->bw == RATE_INFO_BW_80 ||
1401                  (rate->bw == RATE_INFO_BW_HE_RU &&
1402                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1403                 result = rates_969[rate->he_gi];
1404         else if (rate->bw == RATE_INFO_BW_40 ||
1405                  (rate->bw == RATE_INFO_BW_HE_RU &&
1406                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1407                 result = rates_484[rate->he_gi];
1408         else if (rate->bw == RATE_INFO_BW_20 ||
1409                  (rate->bw == RATE_INFO_BW_HE_RU &&
1410                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1411                 result = rates_242[rate->he_gi];
1412         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1413                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1414                 result = rates_106[rate->he_gi];
1415         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1416                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1417                 result = rates_52[rate->he_gi];
1418         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1419                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1420                 result = rates_26[rate->he_gi];
1421         else {
1422                 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1423                      rate->bw, rate->he_ru_alloc);
1424                 return 0;
1425         }
1426
1427         /* now scale to the appropriate MCS */
1428         tmp = result;
1429         tmp *= SCALE;
1430         do_div(tmp, mcs_divisors[rate->mcs]);
1431         result = tmp;
1432
1433         /* and take NSS, DCM into account */
1434         result = (result * rate->nss) / 8;
1435         if (rate->he_dcm)
1436                 result /= 2;
1437
1438         return result / 10000;
1439 }
1440
1441 static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
1442 {
1443 #define SCALE 6144
1444         static const u32 mcs_divisors[16] = {
1445                 102399, /* 16.666666... */
1446                  51201, /*  8.333333... */
1447                  34134, /*  5.555555... */
1448                  25599, /*  4.166666... */
1449                  17067, /*  2.777777... */
1450                  12801, /*  2.083333... */
1451                  11377, /*  1.851725... */
1452                  10239, /*  1.666666... */
1453                   8532, /*  1.388888... */
1454                   7680, /*  1.250000... */
1455                   6828, /*  1.111111... */
1456                   6144, /*  1.000000... */
1457                   5690, /*  0.926106... */
1458                   5120, /*  0.833333... */
1459                 409600, /* 66.666666... */
1460                 204800, /* 33.333333... */
1461         };
1462         static const u32 rates_996[3] =  { 480388888, 453700000, 408333333 };
1463         static const u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1464         static const u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1465         static const u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1466         static const u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1467         static const u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1468         u64 tmp;
1469         u32 result;
1470
1471         if (WARN_ON_ONCE(rate->mcs > 15))
1472                 return 0;
1473         if (WARN_ON_ONCE(rate->eht_gi > NL80211_RATE_INFO_EHT_GI_3_2))
1474                 return 0;
1475         if (WARN_ON_ONCE(rate->eht_ru_alloc >
1476                          NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1477                 return 0;
1478         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1479                 return 0;
1480
1481         /* Bandwidth checks for MCS 14 */
1482         if (rate->mcs == 14) {
1483                 if ((rate->bw != RATE_INFO_BW_EHT_RU &&
1484                      rate->bw != RATE_INFO_BW_80 &&
1485                      rate->bw != RATE_INFO_BW_160 &&
1486                      rate->bw != RATE_INFO_BW_320) ||
1487                     (rate->bw == RATE_INFO_BW_EHT_RU &&
1488                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_996 &&
1489                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_2x996 &&
1490                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_4x996)) {
1491                         WARN(1, "invalid EHT BW for MCS 14: bw:%d, ru:%d\n",
1492                              rate->bw, rate->eht_ru_alloc);
1493                         return 0;
1494                 }
1495         }
1496
1497         if (rate->bw == RATE_INFO_BW_320 ||
1498             (rate->bw == RATE_INFO_BW_EHT_RU &&
1499              rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1500                 result = 4 * rates_996[rate->eht_gi];
1501         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1502                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996P484)
1503                 result = 3 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1504         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1505                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996)
1506                 result = 3 * rates_996[rate->eht_gi];
1507         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1508                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996P484)
1509                 result = 2 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1510         else if (rate->bw == RATE_INFO_BW_160 ||
1511                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1512                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996))
1513                 result = 2 * rates_996[rate->eht_gi];
1514         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1515                  rate->eht_ru_alloc ==
1516                  NL80211_RATE_INFO_EHT_RU_ALLOC_996P484P242)
1517                 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi]
1518                          + rates_242[rate->eht_gi];
1519         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1520                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996P484)
1521                 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1522         else if (rate->bw == RATE_INFO_BW_80 ||
1523                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1524                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996))
1525                 result = rates_996[rate->eht_gi];
1526         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1527                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484P242)
1528                 result = rates_484[rate->eht_gi] + rates_242[rate->eht_gi];
1529         else if (rate->bw == RATE_INFO_BW_40 ||
1530                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1531                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484))
1532                 result = rates_484[rate->eht_gi];
1533         else if (rate->bw == RATE_INFO_BW_20 ||
1534                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1535                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_242))
1536                 result = rates_242[rate->eht_gi];
1537         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1538                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106P26)
1539                 result = rates_106[rate->eht_gi] + rates_26[rate->eht_gi];
1540         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1541                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106)
1542                 result = rates_106[rate->eht_gi];
1543         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1544                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52P26)
1545                 result = rates_52[rate->eht_gi] + rates_26[rate->eht_gi];
1546         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1547                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52)
1548                 result = rates_52[rate->eht_gi];
1549         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1550                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_26)
1551                 result = rates_26[rate->eht_gi];
1552         else {
1553                 WARN(1, "invalid EHT MCS: bw:%d, ru:%d\n",
1554                      rate->bw, rate->eht_ru_alloc);
1555                 return 0;
1556         }
1557
1558         /* now scale to the appropriate MCS */
1559         tmp = result;
1560         tmp *= SCALE;
1561         do_div(tmp, mcs_divisors[rate->mcs]);
1562
1563         /* and take NSS */
1564         tmp *= rate->nss;
1565         do_div(tmp, 8);
1566
1567         result = tmp;
1568
1569         return result / 10000;
1570 }
1571
1572 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1573 {
1574         if (rate->flags & RATE_INFO_FLAGS_MCS)
1575                 return cfg80211_calculate_bitrate_ht(rate);
1576         if (rate->flags & RATE_INFO_FLAGS_DMG)
1577                 return cfg80211_calculate_bitrate_dmg(rate);
1578         if (rate->flags & RATE_INFO_FLAGS_EXTENDED_SC_DMG)
1579                 return cfg80211_calculate_bitrate_extended_sc_dmg(rate);
1580         if (rate->flags & RATE_INFO_FLAGS_EDMG)
1581                 return cfg80211_calculate_bitrate_edmg(rate);
1582         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1583                 return cfg80211_calculate_bitrate_vht(rate);
1584         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1585                 return cfg80211_calculate_bitrate_he(rate);
1586         if (rate->flags & RATE_INFO_FLAGS_EHT_MCS)
1587                 return cfg80211_calculate_bitrate_eht(rate);
1588
1589         return rate->legacy;
1590 }
1591 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1592
1593 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1594                           enum ieee80211_p2p_attr_id attr,
1595                           u8 *buf, unsigned int bufsize)
1596 {
1597         u8 *out = buf;
1598         u16 attr_remaining = 0;
1599         bool desired_attr = false;
1600         u16 desired_len = 0;
1601
1602         while (len > 0) {
1603                 unsigned int iedatalen;
1604                 unsigned int copy;
1605                 const u8 *iedata;
1606
1607                 if (len < 2)
1608                         return -EILSEQ;
1609                 iedatalen = ies[1];
1610                 if (iedatalen + 2 > len)
1611                         return -EILSEQ;
1612
1613                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1614                         goto cont;
1615
1616                 if (iedatalen < 4)
1617                         goto cont;
1618
1619                 iedata = ies + 2;
1620
1621                 /* check WFA OUI, P2P subtype */
1622                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1623                     iedata[2] != 0x9a || iedata[3] != 0x09)
1624                         goto cont;
1625
1626                 iedatalen -= 4;
1627                 iedata += 4;
1628
1629                 /* check attribute continuation into this IE */
1630                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1631                 if (copy && desired_attr) {
1632                         desired_len += copy;
1633                         if (out) {
1634                                 memcpy(out, iedata, min(bufsize, copy));
1635                                 out += min(bufsize, copy);
1636                                 bufsize -= min(bufsize, copy);
1637                         }
1638
1639
1640                         if (copy == attr_remaining)
1641                                 return desired_len;
1642                 }
1643
1644                 attr_remaining -= copy;
1645                 if (attr_remaining)
1646                         goto cont;
1647
1648                 iedatalen -= copy;
1649                 iedata += copy;
1650
1651                 while (iedatalen > 0) {
1652                         u16 attr_len;
1653
1654                         /* P2P attribute ID & size must fit */
1655                         if (iedatalen < 3)
1656                                 return -EILSEQ;
1657                         desired_attr = iedata[0] == attr;
1658                         attr_len = get_unaligned_le16(iedata + 1);
1659                         iedatalen -= 3;
1660                         iedata += 3;
1661
1662                         copy = min_t(unsigned int, attr_len, iedatalen);
1663
1664                         if (desired_attr) {
1665                                 desired_len += copy;
1666                                 if (out) {
1667                                         memcpy(out, iedata, min(bufsize, copy));
1668                                         out += min(bufsize, copy);
1669                                         bufsize -= min(bufsize, copy);
1670                                 }
1671
1672                                 if (copy == attr_len)
1673                                         return desired_len;
1674                         }
1675
1676                         iedata += copy;
1677                         iedatalen -= copy;
1678                         attr_remaining = attr_len - copy;
1679                 }
1680
1681  cont:
1682                 len -= ies[1] + 2;
1683                 ies += ies[1] + 2;
1684         }
1685
1686         if (attr_remaining && desired_attr)
1687                 return -EILSEQ;
1688
1689         return -ENOENT;
1690 }
1691 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1692
1693 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1694 {
1695         int i;
1696
1697         /* Make sure array values are legal */
1698         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1699                 return false;
1700
1701         i = 0;
1702         while (i < n_ids) {
1703                 if (ids[i] == WLAN_EID_EXTENSION) {
1704                         if (id_ext && (ids[i + 1] == id))
1705                                 return true;
1706
1707                         i += 2;
1708                         continue;
1709                 }
1710
1711                 if (ids[i] == id && !id_ext)
1712                         return true;
1713
1714                 i++;
1715         }
1716         return false;
1717 }
1718
1719 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1720 {
1721         /* we assume a validly formed IEs buffer */
1722         u8 len = ies[pos + 1];
1723
1724         pos += 2 + len;
1725
1726         /* the IE itself must have 255 bytes for fragments to follow */
1727         if (len < 255)
1728                 return pos;
1729
1730         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1731                 len = ies[pos + 1];
1732                 pos += 2 + len;
1733         }
1734
1735         return pos;
1736 }
1737
1738 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1739                               const u8 *ids, int n_ids,
1740                               const u8 *after_ric, int n_after_ric,
1741                               size_t offset)
1742 {
1743         size_t pos = offset;
1744
1745         while (pos < ielen) {
1746                 u8 ext = 0;
1747
1748                 if (ies[pos] == WLAN_EID_EXTENSION)
1749                         ext = 2;
1750                 if ((pos + ext) >= ielen)
1751                         break;
1752
1753                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1754                                           ies[pos] == WLAN_EID_EXTENSION))
1755                         break;
1756
1757                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1758                         pos = skip_ie(ies, ielen, pos);
1759
1760                         while (pos < ielen) {
1761                                 if (ies[pos] == WLAN_EID_EXTENSION)
1762                                         ext = 2;
1763                                 else
1764                                         ext = 0;
1765
1766                                 if ((pos + ext) >= ielen)
1767                                         break;
1768
1769                                 if (!ieee80211_id_in_list(after_ric,
1770                                                           n_after_ric,
1771                                                           ies[pos + ext],
1772                                                           ext == 2))
1773                                         pos = skip_ie(ies, ielen, pos);
1774                                 else
1775                                         break;
1776                         }
1777                 } else {
1778                         pos = skip_ie(ies, ielen, pos);
1779                 }
1780         }
1781
1782         return pos;
1783 }
1784 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1785
1786 bool ieee80211_operating_class_to_band(u8 operating_class,
1787                                        enum nl80211_band *band)
1788 {
1789         switch (operating_class) {
1790         case 112:
1791         case 115 ... 127:
1792         case 128 ... 130:
1793                 *band = NL80211_BAND_5GHZ;
1794                 return true;
1795         case 131 ... 135:
1796                 *band = NL80211_BAND_6GHZ;
1797                 return true;
1798         case 81:
1799         case 82:
1800         case 83:
1801         case 84:
1802                 *band = NL80211_BAND_2GHZ;
1803                 return true;
1804         case 180:
1805                 *band = NL80211_BAND_60GHZ;
1806                 return true;
1807         }
1808
1809         return false;
1810 }
1811 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1812
1813 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1814                                           u8 *op_class)
1815 {
1816         u8 vht_opclass;
1817         u32 freq = chandef->center_freq1;
1818
1819         if (freq >= 2412 && freq <= 2472) {
1820                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1821                         return false;
1822
1823                 /* 2.407 GHz, channels 1..13 */
1824                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1825                         if (freq > chandef->chan->center_freq)
1826                                 *op_class = 83; /* HT40+ */
1827                         else
1828                                 *op_class = 84; /* HT40- */
1829                 } else {
1830                         *op_class = 81;
1831                 }
1832
1833                 return true;
1834         }
1835
1836         if (freq == 2484) {
1837                 /* channel 14 is only for IEEE 802.11b */
1838                 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1839                         return false;
1840
1841                 *op_class = 82; /* channel 14 */
1842                 return true;
1843         }
1844
1845         switch (chandef->width) {
1846         case NL80211_CHAN_WIDTH_80:
1847                 vht_opclass = 128;
1848                 break;
1849         case NL80211_CHAN_WIDTH_160:
1850                 vht_opclass = 129;
1851                 break;
1852         case NL80211_CHAN_WIDTH_80P80:
1853                 vht_opclass = 130;
1854                 break;
1855         case NL80211_CHAN_WIDTH_10:
1856         case NL80211_CHAN_WIDTH_5:
1857                 return false; /* unsupported for now */
1858         default:
1859                 vht_opclass = 0;
1860                 break;
1861         }
1862
1863         /* 5 GHz, channels 36..48 */
1864         if (freq >= 5180 && freq <= 5240) {
1865                 if (vht_opclass) {
1866                         *op_class = vht_opclass;
1867                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1868                         if (freq > chandef->chan->center_freq)
1869                                 *op_class = 116;
1870                         else
1871                                 *op_class = 117;
1872                 } else {
1873                         *op_class = 115;
1874                 }
1875
1876                 return true;
1877         }
1878
1879         /* 5 GHz, channels 52..64 */
1880         if (freq >= 5260 && freq <= 5320) {
1881                 if (vht_opclass) {
1882                         *op_class = vht_opclass;
1883                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1884                         if (freq > chandef->chan->center_freq)
1885                                 *op_class = 119;
1886                         else
1887                                 *op_class = 120;
1888                 } else {
1889                         *op_class = 118;
1890                 }
1891
1892                 return true;
1893         }
1894
1895         /* 5 GHz, channels 100..144 */
1896         if (freq >= 5500 && freq <= 5720) {
1897                 if (vht_opclass) {
1898                         *op_class = vht_opclass;
1899                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1900                         if (freq > chandef->chan->center_freq)
1901                                 *op_class = 122;
1902                         else
1903                                 *op_class = 123;
1904                 } else {
1905                         *op_class = 121;
1906                 }
1907
1908                 return true;
1909         }
1910
1911         /* 5 GHz, channels 149..169 */
1912         if (freq >= 5745 && freq <= 5845) {
1913                 if (vht_opclass) {
1914                         *op_class = vht_opclass;
1915                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1916                         if (freq > chandef->chan->center_freq)
1917                                 *op_class = 126;
1918                         else
1919                                 *op_class = 127;
1920                 } else if (freq <= 5805) {
1921                         *op_class = 124;
1922                 } else {
1923                         *op_class = 125;
1924                 }
1925
1926                 return true;
1927         }
1928
1929         /* 56.16 GHz, channel 1..4 */
1930         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1931                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1932                         return false;
1933
1934                 *op_class = 180;
1935                 return true;
1936         }
1937
1938         /* not supported yet */
1939         return false;
1940 }
1941 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1942
1943 static int cfg80211_wdev_bi(struct wireless_dev *wdev)
1944 {
1945         switch (wdev->iftype) {
1946         case NL80211_IFTYPE_AP:
1947         case NL80211_IFTYPE_P2P_GO:
1948                 WARN_ON(wdev->valid_links);
1949                 return wdev->links[0].ap.beacon_interval;
1950         case NL80211_IFTYPE_MESH_POINT:
1951                 return wdev->u.mesh.beacon_interval;
1952         case NL80211_IFTYPE_ADHOC:
1953                 return wdev->u.ibss.beacon_interval;
1954         default:
1955                 break;
1956         }
1957
1958         return 0;
1959 }
1960
1961 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1962                                        u32 *beacon_int_gcd,
1963                                        bool *beacon_int_different)
1964 {
1965         struct wireless_dev *wdev;
1966
1967         *beacon_int_gcd = 0;
1968         *beacon_int_different = false;
1969
1970         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1971                 int wdev_bi;
1972
1973                 /* this feature isn't supported with MLO */
1974                 if (wdev->valid_links)
1975                         continue;
1976
1977                 wdev_bi = cfg80211_wdev_bi(wdev);
1978
1979                 if (!wdev_bi)
1980                         continue;
1981
1982                 if (!*beacon_int_gcd) {
1983                         *beacon_int_gcd = wdev_bi;
1984                         continue;
1985                 }
1986
1987                 if (wdev_bi == *beacon_int_gcd)
1988                         continue;
1989
1990                 *beacon_int_different = true;
1991                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev_bi);
1992         }
1993
1994         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1995                 if (*beacon_int_gcd)
1996                         *beacon_int_different = true;
1997                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1998         }
1999 }
2000
2001 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
2002                                  enum nl80211_iftype iftype, u32 beacon_int)
2003 {
2004         /*
2005          * This is just a basic pre-condition check; if interface combinations
2006          * are possible the driver must already be checking those with a call
2007          * to cfg80211_check_combinations(), in which case we'll validate more
2008          * through the cfg80211_calculate_bi_data() call and code in
2009          * cfg80211_iter_combinations().
2010          */
2011
2012         if (beacon_int < 10 || beacon_int > 10000)
2013                 return -EINVAL;
2014
2015         return 0;
2016 }
2017
2018 int cfg80211_iter_combinations(struct wiphy *wiphy,
2019                                struct iface_combination_params *params,
2020                                void (*iter)(const struct ieee80211_iface_combination *c,
2021                                             void *data),
2022                                void *data)
2023 {
2024         const struct ieee80211_regdomain *regdom;
2025         enum nl80211_dfs_regions region = 0;
2026         int i, j, iftype;
2027         int num_interfaces = 0;
2028         u32 used_iftypes = 0;
2029         u32 beacon_int_gcd;
2030         bool beacon_int_different;
2031
2032         /*
2033          * This is a bit strange, since the iteration used to rely only on
2034          * the data given by the driver, but here it now relies on context,
2035          * in form of the currently operating interfaces.
2036          * This is OK for all current users, and saves us from having to
2037          * push the GCD calculations into all the drivers.
2038          * In the future, this should probably rely more on data that's in
2039          * cfg80211 already - the only thing not would appear to be any new
2040          * interfaces (while being brought up) and channel/radar data.
2041          */
2042         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
2043                                    &beacon_int_gcd, &beacon_int_different);
2044
2045         if (params->radar_detect) {
2046                 rcu_read_lock();
2047                 regdom = rcu_dereference(cfg80211_regdomain);
2048                 if (regdom)
2049                         region = regdom->dfs_region;
2050                 rcu_read_unlock();
2051         }
2052
2053         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2054                 num_interfaces += params->iftype_num[iftype];
2055                 if (params->iftype_num[iftype] > 0 &&
2056                     !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2057                         used_iftypes |= BIT(iftype);
2058         }
2059
2060         for (i = 0; i < wiphy->n_iface_combinations; i++) {
2061                 const struct ieee80211_iface_combination *c;
2062                 struct ieee80211_iface_limit *limits;
2063                 u32 all_iftypes = 0;
2064
2065                 c = &wiphy->iface_combinations[i];
2066
2067                 if (num_interfaces > c->max_interfaces)
2068                         continue;
2069                 if (params->num_different_channels > c->num_different_channels)
2070                         continue;
2071
2072                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
2073                                  GFP_KERNEL);
2074                 if (!limits)
2075                         return -ENOMEM;
2076
2077                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2078                         if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2079                                 continue;
2080                         for (j = 0; j < c->n_limits; j++) {
2081                                 all_iftypes |= limits[j].types;
2082                                 if (!(limits[j].types & BIT(iftype)))
2083                                         continue;
2084                                 if (limits[j].max < params->iftype_num[iftype])
2085                                         goto cont;
2086                                 limits[j].max -= params->iftype_num[iftype];
2087                         }
2088                 }
2089
2090                 if (params->radar_detect !=
2091                         (c->radar_detect_widths & params->radar_detect))
2092                         goto cont;
2093
2094                 if (params->radar_detect && c->radar_detect_regions &&
2095                     !(c->radar_detect_regions & BIT(region)))
2096                         goto cont;
2097
2098                 /* Finally check that all iftypes that we're currently
2099                  * using are actually part of this combination. If they
2100                  * aren't then we can't use this combination and have
2101                  * to continue to the next.
2102                  */
2103                 if ((all_iftypes & used_iftypes) != used_iftypes)
2104                         goto cont;
2105
2106                 if (beacon_int_gcd) {
2107                         if (c->beacon_int_min_gcd &&
2108                             beacon_int_gcd < c->beacon_int_min_gcd)
2109                                 goto cont;
2110                         if (!c->beacon_int_min_gcd && beacon_int_different)
2111                                 goto cont;
2112                 }
2113
2114                 /* This combination covered all interface types and
2115                  * supported the requested numbers, so we're good.
2116                  */
2117
2118                 (*iter)(c, data);
2119  cont:
2120                 kfree(limits);
2121         }
2122
2123         return 0;
2124 }
2125 EXPORT_SYMBOL(cfg80211_iter_combinations);
2126
2127 static void
2128 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
2129                           void *data)
2130 {
2131         int *num = data;
2132         (*num)++;
2133 }
2134
2135 int cfg80211_check_combinations(struct wiphy *wiphy,
2136                                 struct iface_combination_params *params)
2137 {
2138         int err, num = 0;
2139
2140         err = cfg80211_iter_combinations(wiphy, params,
2141                                          cfg80211_iter_sum_ifcombs, &num);
2142         if (err)
2143                 return err;
2144         if (num == 0)
2145                 return -EBUSY;
2146
2147         return 0;
2148 }
2149 EXPORT_SYMBOL(cfg80211_check_combinations);
2150
2151 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
2152                            const u8 *rates, unsigned int n_rates,
2153                            u32 *mask)
2154 {
2155         int i, j;
2156
2157         if (!sband)
2158                 return -EINVAL;
2159
2160         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
2161                 return -EINVAL;
2162
2163         *mask = 0;
2164
2165         for (i = 0; i < n_rates; i++) {
2166                 int rate = (rates[i] & 0x7f) * 5;
2167                 bool found = false;
2168
2169                 for (j = 0; j < sband->n_bitrates; j++) {
2170                         if (sband->bitrates[j].bitrate == rate) {
2171                                 found = true;
2172                                 *mask |= BIT(j);
2173                                 break;
2174                         }
2175                 }
2176                 if (!found)
2177                         return -EINVAL;
2178         }
2179
2180         /*
2181          * mask must have at least one bit set here since we
2182          * didn't accept a 0-length rates array nor allowed
2183          * entries in the array that didn't exist
2184          */
2185
2186         return 0;
2187 }
2188
2189 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
2190 {
2191         enum nl80211_band band;
2192         unsigned int n_channels = 0;
2193
2194         for (band = 0; band < NUM_NL80211_BANDS; band++)
2195                 if (wiphy->bands[band])
2196                         n_channels += wiphy->bands[band]->n_channels;
2197
2198         return n_channels;
2199 }
2200 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
2201
2202 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
2203                          struct station_info *sinfo)
2204 {
2205         struct cfg80211_registered_device *rdev;
2206         struct wireless_dev *wdev;
2207
2208         wdev = dev->ieee80211_ptr;
2209         if (!wdev)
2210                 return -EOPNOTSUPP;
2211
2212         rdev = wiphy_to_rdev(wdev->wiphy);
2213         if (!rdev->ops->get_station)
2214                 return -EOPNOTSUPP;
2215
2216         memset(sinfo, 0, sizeof(*sinfo));
2217
2218         return rdev_get_station(rdev, dev, mac_addr, sinfo);
2219 }
2220 EXPORT_SYMBOL(cfg80211_get_station);
2221
2222 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
2223 {
2224         int i;
2225
2226         if (!f)
2227                 return;
2228
2229         kfree(f->serv_spec_info);
2230         kfree(f->srf_bf);
2231         kfree(f->srf_macs);
2232         for (i = 0; i < f->num_rx_filters; i++)
2233                 kfree(f->rx_filters[i].filter);
2234
2235         for (i = 0; i < f->num_tx_filters; i++)
2236                 kfree(f->tx_filters[i].filter);
2237
2238         kfree(f->rx_filters);
2239         kfree(f->tx_filters);
2240         kfree(f);
2241 }
2242 EXPORT_SYMBOL(cfg80211_free_nan_func);
2243
2244 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
2245                                 u32 center_freq_khz, u32 bw_khz)
2246 {
2247         u32 start_freq_khz, end_freq_khz;
2248
2249         start_freq_khz = center_freq_khz - (bw_khz / 2);
2250         end_freq_khz = center_freq_khz + (bw_khz / 2);
2251
2252         if (start_freq_khz >= freq_range->start_freq_khz &&
2253             end_freq_khz <= freq_range->end_freq_khz)
2254                 return true;
2255
2256         return false;
2257 }
2258
2259 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
2260 {
2261         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
2262                                 sizeof(*(sinfo->pertid)),
2263                                 gfp);
2264         if (!sinfo->pertid)
2265                 return -ENOMEM;
2266
2267         return 0;
2268 }
2269 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
2270
2271 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
2272 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
2273 const unsigned char rfc1042_header[] __aligned(2) =
2274         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
2275 EXPORT_SYMBOL(rfc1042_header);
2276
2277 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2278 const unsigned char bridge_tunnel_header[] __aligned(2) =
2279         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2280 EXPORT_SYMBOL(bridge_tunnel_header);
2281
2282 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2283 struct iapp_layer2_update {
2284         u8 da[ETH_ALEN];        /* broadcast */
2285         u8 sa[ETH_ALEN];        /* STA addr */
2286         __be16 len;             /* 6 */
2287         u8 dsap;                /* 0 */
2288         u8 ssap;                /* 0 */
2289         u8 control;
2290         u8 xid_info[3];
2291 } __packed;
2292
2293 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2294 {
2295         struct iapp_layer2_update *msg;
2296         struct sk_buff *skb;
2297
2298         /* Send Level 2 Update Frame to update forwarding tables in layer 2
2299          * bridge devices */
2300
2301         skb = dev_alloc_skb(sizeof(*msg));
2302         if (!skb)
2303                 return;
2304         msg = skb_put(skb, sizeof(*msg));
2305
2306         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2307          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2308
2309         eth_broadcast_addr(msg->da);
2310         ether_addr_copy(msg->sa, addr);
2311         msg->len = htons(6);
2312         msg->dsap = 0;
2313         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
2314         msg->control = 0xaf;    /* XID response lsb.1111F101.
2315                                  * F=0 (no poll command; unsolicited frame) */
2316         msg->xid_info[0] = 0x81;        /* XID format identifier */
2317         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
2318         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
2319
2320         skb->dev = dev;
2321         skb->protocol = eth_type_trans(skb, dev);
2322         memset(skb->cb, 0, sizeof(skb->cb));
2323         netif_rx(skb);
2324 }
2325 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2326
2327 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2328                               enum ieee80211_vht_chanwidth bw,
2329                               int mcs, bool ext_nss_bw_capable,
2330                               unsigned int max_vht_nss)
2331 {
2332         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2333         int ext_nss_bw;
2334         int supp_width;
2335         int i, mcs_encoding;
2336
2337         if (map == 0xffff)
2338                 return 0;
2339
2340         if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2341                 return 0;
2342         if (mcs <= 7)
2343                 mcs_encoding = 0;
2344         else if (mcs == 8)
2345                 mcs_encoding = 1;
2346         else
2347                 mcs_encoding = 2;
2348
2349         if (!max_vht_nss) {
2350                 /* find max_vht_nss for the given MCS */
2351                 for (i = 7; i >= 0; i--) {
2352                         int supp = (map >> (2 * i)) & 3;
2353
2354                         if (supp == 3)
2355                                 continue;
2356
2357                         if (supp >= mcs_encoding) {
2358                                 max_vht_nss = i + 1;
2359                                 break;
2360                         }
2361                 }
2362         }
2363
2364         if (!(cap->supp_mcs.tx_mcs_map &
2365                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2366                 return max_vht_nss;
2367
2368         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2369                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2370         supp_width = le32_get_bits(cap->vht_cap_info,
2371                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2372
2373         /* if not capable, treat ext_nss_bw as 0 */
2374         if (!ext_nss_bw_capable)
2375                 ext_nss_bw = 0;
2376
2377         /* This is invalid */
2378         if (supp_width == 3)
2379                 return 0;
2380
2381         /* This is an invalid combination so pretend nothing is supported */
2382         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2383                 return 0;
2384
2385         /*
2386          * Cover all the special cases according to IEEE 802.11-2016
2387          * Table 9-250. All other cases are either factor of 1 or not
2388          * valid/supported.
2389          */
2390         switch (bw) {
2391         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2392         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2393                 if ((supp_width == 1 || supp_width == 2) &&
2394                     ext_nss_bw == 3)
2395                         return 2 * max_vht_nss;
2396                 break;
2397         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2398                 if (supp_width == 0 &&
2399                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2400                         return max_vht_nss / 2;
2401                 if (supp_width == 0 &&
2402                     ext_nss_bw == 3)
2403                         return (3 * max_vht_nss) / 4;
2404                 if (supp_width == 1 &&
2405                     ext_nss_bw == 3)
2406                         return 2 * max_vht_nss;
2407                 break;
2408         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2409                 if (supp_width == 0 && ext_nss_bw == 1)
2410                         return 0; /* not possible */
2411                 if (supp_width == 0 &&
2412                     ext_nss_bw == 2)
2413                         return max_vht_nss / 2;
2414                 if (supp_width == 0 &&
2415                     ext_nss_bw == 3)
2416                         return (3 * max_vht_nss) / 4;
2417                 if (supp_width == 1 &&
2418                     ext_nss_bw == 0)
2419                         return 0; /* not possible */
2420                 if (supp_width == 1 &&
2421                     ext_nss_bw == 1)
2422                         return max_vht_nss / 2;
2423                 if (supp_width == 1 &&
2424                     ext_nss_bw == 2)
2425                         return (3 * max_vht_nss) / 4;
2426                 break;
2427         }
2428
2429         /* not covered or invalid combination received */
2430         return max_vht_nss;
2431 }
2432 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2433
2434 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2435                              bool is_4addr, u8 check_swif)
2436
2437 {
2438         bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2439
2440         switch (check_swif) {
2441         case 0:
2442                 if (is_vlan && is_4addr)
2443                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2444                 return wiphy->interface_modes & BIT(iftype);
2445         case 1:
2446                 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2447                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2448                 return wiphy->software_iftypes & BIT(iftype);
2449         default:
2450                 break;
2451         }
2452
2453         return false;
2454 }
2455 EXPORT_SYMBOL(cfg80211_iftype_allowed);
2456
2457 void cfg80211_remove_link(struct wireless_dev *wdev, unsigned int link_id)
2458 {
2459         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
2460
2461         ASSERT_WDEV_LOCK(wdev);
2462
2463         switch (wdev->iftype) {
2464         case NL80211_IFTYPE_AP:
2465         case NL80211_IFTYPE_P2P_GO:
2466                 __cfg80211_stop_ap(rdev, wdev->netdev, link_id, true);
2467                 break;
2468         default:
2469                 /* per-link not relevant */
2470                 break;
2471         }
2472
2473         wdev->valid_links &= ~BIT(link_id);
2474
2475         rdev_del_intf_link(rdev, wdev, link_id);
2476
2477         eth_zero_addr(wdev->links[link_id].addr);
2478 }
2479
2480 void cfg80211_remove_links(struct wireless_dev *wdev)
2481 {
2482         unsigned int link_id;
2483
2484         wdev_lock(wdev);
2485         if (wdev->valid_links) {
2486                 for_each_valid_link(wdev, link_id)
2487                         cfg80211_remove_link(wdev, link_id);
2488         }
2489         wdev_unlock(wdev);
2490 }
2491
2492 int cfg80211_remove_virtual_intf(struct cfg80211_registered_device *rdev,
2493                                  struct wireless_dev *wdev)
2494 {
2495         cfg80211_remove_links(wdev);
2496
2497         return rdev_del_virtual_intf(rdev, wdev);
2498 }
2499
2500 const struct wiphy_iftype_ext_capab *
2501 cfg80211_get_iftype_ext_capa(struct wiphy *wiphy, enum nl80211_iftype type)
2502 {
2503         int i;
2504
2505         for (i = 0; i < wiphy->num_iftype_ext_capab; i++) {
2506                 if (wiphy->iftype_ext_capab[i].iftype == type)
2507                         return &wiphy->iftype_ext_capab[i];
2508         }
2509
2510         return NULL;
2511 }
2512 EXPORT_SYMBOL(cfg80211_get_iftype_ext_capa);