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) 2018-2021 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 + 8)
 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);
 579
 580         mesh_flags &= MESH_FLAGS_AE;
 581
 582         switch (hdr->frame_control &
 583                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 584         case cpu_to_le16(IEEE80211_FCTL_TODS):
 585                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 586                              iftype != NL80211_IFTYPE_AP_VLAN &&
 587                              iftype != NL80211_IFTYPE_P2P_GO))
 588                         return -1;
 589                 break;
 590         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 591                 if (unlikely(iftype != NL80211_IFTYPE_MESH_POINT &&
 592                              iftype != NL80211_IFTYPE_AP_VLAN &&
 593                              iftype != NL80211_IFTYPE_STATION))
 594                         return -1;
 595                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 596                         if (mesh_flags == MESH_FLAGS_AE_A4)
 597                                 return -1;
 598                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 599                                 skb_copy_bits(skb, hdrlen +
 600                                         offsetof(struct ieee80211s_hdr, eaddr1),
 601                                         tmp.h_dest, 2 * ETH_ALEN);
 602                         }
 603                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 604                 }
 605                 break;
 606         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 607                 if ((iftype != NL80211_IFTYPE_STATION &&
 608                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 609                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 610                     (is_multicast_ether_addr(tmp.h_dest) &&
 611                      ether_addr_equal(tmp.h_source, addr)))
 612                         return -1;
 613                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 614                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 615                                 return -1;
 616                         if (mesh_flags == MESH_FLAGS_AE_A4)
 617                                 skb_copy_bits(skb, hdrlen +
 618                                         offsetof(struct ieee80211s_hdr, eaddr1),
 619                                         tmp.h_source, ETH_ALEN);
 620                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 621                 }
 622                 break;
 623         case cpu_to_le16(0):
 624                 if (iftype != NL80211_IFTYPE_ADHOC &&
 625                     iftype != NL80211_IFTYPE_STATION &&
 626                     iftype != NL80211_IFTYPE_OCB)
 627                                 return -1;
 628                 break;
 629         }
 630
 631         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 632         tmp.h_proto = payload.proto;
 633
 634         if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
 635                     tmp.h_proto != htons(ETH_P_AARP) &&
 636                     tmp.h_proto != htons(ETH_P_IPX)) ||
 637                    ether_addr_equal(payload.hdr, bridge_tunnel_header))) {
 638                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 639                  * replace EtherType */
 640                 hdrlen += ETH_ALEN + 2;
 641                 skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
 642         } else {
 643                 tmp.h_proto = htons(skb->len - hdrlen);
 644         }
 645
 646         pskb_pull(skb, hdrlen);
 647
 648         if (!ehdr)
 649                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 650         memcpy(ehdr, &tmp, sizeof(tmp));
 651
 652         return 0;
 653 }
 654 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 655
 656 static void
 657 __frame_add_frag(struct sk_buff *skb, struct page *page,
 658                  void *ptr, int len, int size)
 659 {
 660         struct skb_shared_info *sh = skb_shinfo(skb);
 661         int page_offset;
 662
 663         get_page(page);
 664         page_offset = ptr - page_address(page);
 665         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 666 }
 667
 668 static void
 669 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 670                             int offset, int len)
 671 {
 672         struct skb_shared_info *sh = skb_shinfo(skb);
 673         const skb_frag_t *frag = &sh->frags[0];
 674         struct page *frag_page;
 675         void *frag_ptr;
 676         int frag_len, frag_size;
 677         int head_size = skb->len - skb->data_len;
 678         int cur_len;
 679
 680         frag_page = virt_to_head_page(skb->head);
 681         frag_ptr = skb->data;
 682         frag_size = head_size;
 683
 684         while (offset >= frag_size) {
 685                 offset -= frag_size;
 686                 frag_page = skb_frag_page(frag);
 687                 frag_ptr = skb_frag_address(frag);
 688                 frag_size = skb_frag_size(frag);
 689                 frag++;
 690         }
 691
 692         frag_ptr += offset;
 693         frag_len = frag_size - offset;
 694
 695         cur_len = min(len, frag_len);
 696
 697         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 698         len -= cur_len;
 699
 700         while (len > 0) {
 701                 frag_len = skb_frag_size(frag);
 702                 cur_len = min(len, frag_len);
 703                 __frame_add_frag(frame, skb_frag_page(frag),
 704                                  skb_frag_address(frag), cur_len, frag_len);
 705                 len -= cur_len;
 706                 frag++;
 707         }
 708 }
 709
 710 static struct sk_buff *
 711 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 712                        int offset, int len, bool reuse_frag)
 713 {
 714         struct sk_buff *frame;
 715         int cur_len = len;
 716
 717         if (skb->len - offset < len)
 718                 return NULL;
 719
 720         /*
 721          * When reusing framents, copy some data to the head to simplify
 722          * ethernet header handling and speed up protocol header processing
 723          * in the stack later.
 724          */
 725         if (reuse_frag)
 726                 cur_len = min_t(int, len, 32);
 727
 728         /*
 729          * Allocate and reserve two bytes more for payload
 730          * alignment since sizeof(struct ethhdr) is 14.
 731          */
 732         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 733         if (!frame)
 734                 return NULL;
 735
 736         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 737         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 738
 739         len -= cur_len;
 740         if (!len)
 741                 return frame;
 742
 743         offset += cur_len;
 744         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 745
 746         return frame;
 747 }
 748
 749 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 750                               const u8 *addr, enum nl80211_iftype iftype,
 751                               const unsigned int extra_headroom,
 752                               const u8 *check_da, const u8 *check_sa)
 753 {
 754         unsigned int hlen = ALIGN(extra_headroom, 4);
 755         struct sk_buff *frame = NULL;
 756         u16 ethertype;
 757         u8 *payload;
 758         int offset = 0, remaining;
 759         struct ethhdr eth;
 760         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 761         bool reuse_skb = false;
 762         bool last = false;
 763
 764         while (!last) {
 765                 unsigned int subframe_len;
 766                 int len;
 767                 u8 padding;
 768
 769                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 770                 len = ntohs(eth.h_proto);
 771                 subframe_len = sizeof(struct ethhdr) + len;
 772                 padding = (4 - subframe_len) & 0x3;
 773
 774                 /* the last MSDU has no padding */
 775                 remaining = skb->len - offset;
 776                 if (subframe_len > remaining)
 777                         goto purge;
 778                 /* mitigate A-MSDU aggregation injection attacks */
 779                 if (ether_addr_equal(eth.h_dest, rfc1042_header))
 780                         goto purge;
 781
 782                 offset += sizeof(struct ethhdr);
 783                 last = remaining <= subframe_len + padding;
 784
 785                 /* FIXME: should we really accept multicast DA? */
 786                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 787                      !ether_addr_equal(check_da, eth.h_dest)) ||
 788                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 789                         offset += len + padding;
 790                         continue;
 791                 }
 792
 793                 /* reuse skb for the last subframe */
 794                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 795                         skb_pull(skb, offset);
 796                         frame = skb;
 797                         reuse_skb = true;
 798                 } else {
 799                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 800                                                        reuse_frag);
 801                         if (!frame)
 802                                 goto purge;
 803
 804                         offset += len + padding;
 805                 }
 806
 807                 skb_reset_network_header(frame);
 808                 frame->dev = skb->dev;
 809                 frame->priority = skb->priority;
 810
 811                 payload = frame->data;
 812                 ethertype = (payload[6] << 8) | payload[7];
 813                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 814                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 815                            ether_addr_equal(payload, bridge_tunnel_header))) {
 816                         eth.h_proto = htons(ethertype);
 817                         skb_pull(frame, ETH_ALEN + 2);
 818                 }
 819
 820                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 821                 __skb_queue_tail(list, frame);
 822         }
 823
 824         if (!reuse_skb)
 825                 dev_kfree_skb(skb);
 826
 827         return;
 828
 829  purge:
 830         __skb_queue_purge(list);
 831         dev_kfree_skb(skb);
 832 }
 833 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 834
 835 /* Given a data frame determine the 802.1p/1d tag to use. */
 836 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 837                                     struct cfg80211_qos_map *qos_map)
 838 {
 839         unsigned int dscp;
 840         unsigned char vlan_priority;
 841         unsigned int ret;
 842
 843         /* skb->priority values from 256->263 are magic values to
 844          * directly indicate a specific 802.1d priority.  This is used
 845          * to allow 802.1d priority to be passed directly in from VLAN
 846          * tags, etc.
 847          */
 848         if (skb->priority >= 256 && skb->priority <= 263) {
 849                 ret = skb->priority - 256;
 850                 goto out;
 851         }
 852
 853         if (skb_vlan_tag_present(skb)) {
 854                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 855                         >> VLAN_PRIO_SHIFT;
 856                 if (vlan_priority > 0) {
 857                         ret = vlan_priority;
 858                         goto out;
 859                 }
 860         }
 861
 862         switch (skb->protocol) {
 863         case htons(ETH_P_IP):
 864                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 865                 break;
 866         case htons(ETH_P_IPV6):
 867                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 868                 break;
 869         case htons(ETH_P_MPLS_UC):
 870         case htons(ETH_P_MPLS_MC): {
 871                 struct mpls_label mpls_tmp, *mpls;
 872
 873                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 874                                           sizeof(*mpls), &mpls_tmp);
 875                 if (!mpls)
 876                         return 0;
 877
 878                 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 879                         >> MPLS_LS_TC_SHIFT;
 880                 goto out;
 881         }
 882         case htons(ETH_P_80221):
 883                 /* 802.21 is always network control traffic */
 884                 return 7;
 885         default:
 886                 return 0;
 887         }
 888
 889         if (qos_map) {
 890                 unsigned int i, tmp_dscp = dscp >> 2;
 891
 892                 for (i = 0; i < qos_map->num_des; i++) {
 893                         if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
 894                                 ret = qos_map->dscp_exception[i].up;
 895                                 goto out;
 896                         }
 897                 }
 898
 899                 for (i = 0; i < 8; i++) {
 900                         if (tmp_dscp >= qos_map->up[i].low &&
 901                             tmp_dscp <= qos_map->up[i].high) {
 902                                 ret = i;
 903                                 goto out;
 904                         }
 905                 }
 906         }
 907
 908         ret = dscp >> 5;
 909 out:
 910         return array_index_nospec(ret, IEEE80211_NUM_TIDS);
 911 }
 912 EXPORT_SYMBOL(cfg80211_classify8021d);
 913
 914 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
 915 {
 916         const struct cfg80211_bss_ies *ies;
 917
 918         ies = rcu_dereference(bss->ies);
 919         if (!ies)
 920                 return NULL;
 921
 922         return cfg80211_find_elem(id, ies->data, ies->len);
 923 }
 924 EXPORT_SYMBOL(ieee80211_bss_get_elem);
 925
 926 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 927 {
 928         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 929         struct net_device *dev = wdev->netdev;
 930         int i;
 931
 932         if (!wdev->connect_keys)
 933                 return;
 934
 935         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 936                 if (!wdev->connect_keys->params[i].cipher)
 937                         continue;
 938                 if (rdev_add_key(rdev, dev, i, false, NULL,
 939                                  &wdev->connect_keys->params[i])) {
 940                         netdev_err(dev, "failed to set key %d\n", i);
 941                         continue;
 942                 }
 943                 if (wdev->connect_keys->def == i &&
 944                     rdev_set_default_key(rdev, dev, i, true, true)) {
 945                         netdev_err(dev, "failed to set defkey %d\n", i);
 946                         continue;
 947                 }
 948         }
 949
 950         kfree_sensitive(wdev->connect_keys);
 951         wdev->connect_keys = NULL;
 952 }
 953
 954 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 955 {
 956         struct cfg80211_event *ev;
 957         unsigned long flags;
 958
 959         spin_lock_irqsave(&wdev->event_lock, flags);
 960         while (!list_empty(&wdev->event_list)) {
 961                 ev = list_first_entry(&wdev->event_list,
 962                                       struct cfg80211_event, list);
 963                 list_del(&ev->list);
 964                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 965
 966                 wdev_lock(wdev);
 967                 switch (ev->type) {
 968                 case EVENT_CONNECT_RESULT:
 969                         __cfg80211_connect_result(
 970                                 wdev->netdev,
 971                                 &ev->cr,
 972                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 973                         break;
 974                 case EVENT_ROAMED:
 975                         __cfg80211_roamed(wdev, &ev->rm);
 976                         break;
 977                 case EVENT_DISCONNECTED:
 978                         __cfg80211_disconnected(wdev->netdev,
 979                                                 ev->dc.ie, ev->dc.ie_len,
 980                                                 ev->dc.reason,
 981                                                 !ev->dc.locally_generated);
 982                         break;
 983                 case EVENT_IBSS_JOINED:
 984                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 985                                                ev->ij.channel);
 986                         break;
 987                 case EVENT_STOPPED:
 988                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 989                         break;
 990                 case EVENT_PORT_AUTHORIZED:
 991                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 992                         break;
 993                 }
 994                 wdev_unlock(wdev);
 995
 996                 kfree(ev);
 997
 998                 spin_lock_irqsave(&wdev->event_lock, flags);
 999         }
1000         spin_unlock_irqrestore(&wdev->event_lock, flags);
1001 }
1002
1003 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
1004 {
1005         struct wireless_dev *wdev;
1006
1007         lockdep_assert_held(&rdev->wiphy.mtx);
1008
1009         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
1010                 cfg80211_process_wdev_events(wdev);
1011 }
1012
1013 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
1014                           struct net_device *dev, enum nl80211_iftype ntype,
1015                           struct vif_params *params)
1016 {
1017         int err;
1018         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1019
1020         lockdep_assert_held(&rdev->wiphy.mtx);
1021
1022         /* don't support changing VLANs, you just re-create them */
1023         if (otype == NL80211_IFTYPE_AP_VLAN)
1024                 return -EOPNOTSUPP;
1025
1026         /* cannot change into P2P device or NAN */
1027         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1028             ntype == NL80211_IFTYPE_NAN)
1029                 return -EOPNOTSUPP;
1030
1031         if (!rdev->ops->change_virtual_intf ||
1032             !(rdev->wiphy.interface_modes & (1 << ntype)))
1033                 return -EOPNOTSUPP;
1034
1035         if (ntype != otype) {
1036                 /* if it's part of a bridge, reject changing type to station/ibss */
1037                 if (netif_is_bridge_port(dev) &&
1038                     (ntype == NL80211_IFTYPE_ADHOC ||
1039                      ntype == NL80211_IFTYPE_STATION ||
1040                      ntype == NL80211_IFTYPE_P2P_CLIENT))
1041                         return -EBUSY;
1042
1043                 dev->ieee80211_ptr->use_4addr = false;
1044                 dev->ieee80211_ptr->mesh_id_up_len = 0;
1045                 wdev_lock(dev->ieee80211_ptr);
1046                 rdev_set_qos_map(rdev, dev, NULL);
1047                 wdev_unlock(dev->ieee80211_ptr);
1048
1049                 switch (otype) {
1050                 case NL80211_IFTYPE_AP:
1051                 case NL80211_IFTYPE_P2P_GO:
1052                         cfg80211_stop_ap(rdev, dev, true);
1053                         break;
1054                 case NL80211_IFTYPE_ADHOC:
1055                         cfg80211_leave_ibss(rdev, dev, false);
1056                         break;
1057                 case NL80211_IFTYPE_STATION:
1058                 case NL80211_IFTYPE_P2P_CLIENT:
1059                         wdev_lock(dev->ieee80211_ptr);
1060                         cfg80211_disconnect(rdev, dev,
1061                                             WLAN_REASON_DEAUTH_LEAVING, true);
1062                         wdev_unlock(dev->ieee80211_ptr);
1063                         break;
1064                 case NL80211_IFTYPE_MESH_POINT:
1065                         /* mesh should be handled? */
1066                         break;
1067                 case NL80211_IFTYPE_OCB:
1068                         cfg80211_leave_ocb(rdev, dev);
1069                         break;
1070                 default:
1071                         break;
1072                 }
1073
1074                 cfg80211_process_rdev_events(rdev);
1075                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1076         }
1077
1078         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1079
1080         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1081
1082         if (!err && params && params->use_4addr != -1)
1083                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1084
1085         if (!err) {
1086                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1087                 switch (ntype) {
1088                 case NL80211_IFTYPE_STATION:
1089                         if (dev->ieee80211_ptr->use_4addr)
1090                                 break;
1091                         fallthrough;
1092                 case NL80211_IFTYPE_OCB:
1093                 case NL80211_IFTYPE_P2P_CLIENT:
1094                 case NL80211_IFTYPE_ADHOC:
1095                         dev->priv_flags |= IFF_DONT_BRIDGE;
1096                         break;
1097                 case NL80211_IFTYPE_P2P_GO:
1098                 case NL80211_IFTYPE_AP:
1099                 case NL80211_IFTYPE_AP_VLAN:
1100                 case NL80211_IFTYPE_MESH_POINT:
1101                         /* bridging OK */
1102                         break;
1103                 case NL80211_IFTYPE_MONITOR:
1104                         /* monitor can't bridge anyway */
1105                         break;
1106                 case NL80211_IFTYPE_UNSPECIFIED:
1107                 case NUM_NL80211_IFTYPES:
1108                         /* not happening */
1109                         break;
1110                 case NL80211_IFTYPE_P2P_DEVICE:
1111                 case NL80211_IFTYPE_WDS:
1112                 case NL80211_IFTYPE_NAN:
1113                         WARN_ON(1);
1114                         break;
1115                 }
1116         }
1117
1118         if (!err && ntype != otype && netif_running(dev)) {
1119                 cfg80211_update_iface_num(rdev, ntype, 1);
1120                 cfg80211_update_iface_num(rdev, otype, -1);
1121         }
1122
1123         return err;
1124 }
1125
1126 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1127 {
1128         int modulation, streams, bitrate;
1129
1130         /* the formula below does only work for MCS values smaller than 32 */
1131         if (WARN_ON_ONCE(rate->mcs >= 32))
1132                 return 0;
1133
1134         modulation = rate->mcs & 7;
1135         streams = (rate->mcs >> 3) + 1;
1136
1137         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1138
1139         if (modulation < 4)
1140                 bitrate *= (modulation + 1);
1141         else if (modulation == 4)
1142                 bitrate *= (modulation + 2);
1143         else
1144                 bitrate *= (modulation + 3);
1145
1146         bitrate *= streams;
1147
1148         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1149                 bitrate = (bitrate / 9) * 10;
1150
1151         /* do NOT round down here */
1152         return (bitrate + 50000) / 100000;
1153 }
1154
1155 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1156 {
1157         static const u32 __mcs2bitrate[] = {
1158                 /* control PHY */
1159                 [0] =   275,
1160                 /* SC PHY */
1161                 [1] =  3850,
1162                 [2] =  7700,
1163                 [3] =  9625,
1164                 [4] = 11550,
1165                 [5] = 12512, /* 1251.25 mbps */
1166                 [6] = 15400,
1167                 [7] = 19250,
1168                 [8] = 23100,
1169                 [9] = 25025,
1170                 [10] = 30800,
1171                 [11] = 38500,
1172                 [12] = 46200,
1173                 /* OFDM PHY */
1174                 [13] =  6930,
1175                 [14] =  8662, /* 866.25 mbps */
1176                 [15] = 13860,
1177                 [16] = 17325,
1178                 [17] = 20790,
1179                 [18] = 27720,
1180                 [19] = 34650,
1181                 [20] = 41580,
1182                 [21] = 45045,
1183                 [22] = 51975,
1184                 [23] = 62370,
1185                 [24] = 67568, /* 6756.75 mbps */
1186                 /* LP-SC PHY */
1187                 [25] =  6260,
1188                 [26] =  8340,
1189                 [27] = 11120,
1190                 [28] = 12510,
1191                 [29] = 16680,
1192                 [30] = 22240,
1193                 [31] = 25030,
1194         };
1195
1196         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1197                 return 0;
1198
1199         return __mcs2bitrate[rate->mcs];
1200 }
1201
1202 static u32 cfg80211_calculate_bitrate_extended_sc_dmg(struct rate_info *rate)
1203 {
1204         static const u32 __mcs2bitrate[] = {
1205                 [6 - 6] = 26950, /* MCS 9.1 : 2695.0 mbps */
1206                 [7 - 6] = 50050, /* MCS 12.1 */
1207                 [8 - 6] = 53900,
1208                 [9 - 6] = 57750,
1209                 [10 - 6] = 63900,
1210                 [11 - 6] = 75075,
1211                 [12 - 6] = 80850,
1212         };
1213
1214         /* Extended SC MCS not defined for base MCS below 6 or above 12 */
1215         if (WARN_ON_ONCE(rate->mcs < 6 || rate->mcs > 12))
1216                 return 0;
1217
1218         return __mcs2bitrate[rate->mcs - 6];
1219 }
1220
1221 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1222 {
1223         static const u32 __mcs2bitrate[] = {
1224                 /* control PHY */
1225                 [0] =   275,
1226                 /* SC PHY */
1227                 [1] =  3850,
1228                 [2] =  7700,
1229                 [3] =  9625,
1230                 [4] = 11550,
1231                 [5] = 12512, /* 1251.25 mbps */
1232                 [6] = 13475,
1233                 [7] = 15400,
1234                 [8] = 19250,
1235                 [9] = 23100,
1236                 [10] = 25025,
1237                 [11] = 26950,
1238                 [12] = 30800,
1239                 [13] = 38500,
1240                 [14] = 46200,
1241                 [15] = 50050,
1242                 [16] = 53900,
1243                 [17] = 57750,
1244                 [18] = 69300,
1245                 [19] = 75075,
1246                 [20] = 80850,
1247         };
1248
1249         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1250                 return 0;
1251
1252         return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1253 }
1254
1255 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1256 {
1257         static const u32 base[4][12] = {
1258                 {   6500000,
1259                    13000000,
1260                    19500000,
1261                    26000000,
1262                    39000000,
1263                    52000000,
1264                    58500000,
1265                    65000000,
1266                    78000000,
1267                 /* not in the spec, but some devices use this: */
1268                    86700000,
1269                    97500000,
1270                   108300000,
1271                 },
1272                 {  13500000,
1273                    27000000,
1274                    40500000,
1275                    54000000,
1276                    81000000,
1277                   108000000,
1278                   121500000,
1279                   135000000,
1280                   162000000,
1281                   180000000,
1282                   202500000,
1283                   225000000,
1284                 },
1285                 {  29300000,
1286                    58500000,
1287                    87800000,
1288                   117000000,
1289                   175500000,
1290                   234000000,
1291                   263300000,
1292                   292500000,
1293                   351000000,
1294                   390000000,
1295                   438800000,
1296                   487500000,
1297                 },
1298                 {  58500000,
1299                   117000000,
1300                   175500000,
1301                   234000000,
1302                   351000000,
1303                   468000000,
1304                   526500000,
1305                   585000000,
1306                   702000000,
1307                   780000000,
1308                   877500000,
1309                   975000000,
1310                 },
1311         };
1312         u32 bitrate;
1313         int idx;
1314
1315         if (rate->mcs > 11)
1316                 goto warn;
1317
1318         switch (rate->bw) {
1319         case RATE_INFO_BW_160:
1320                 idx = 3;
1321                 break;
1322         case RATE_INFO_BW_80:
1323                 idx = 2;
1324                 break;
1325         case RATE_INFO_BW_40:
1326                 idx = 1;
1327                 break;
1328         case RATE_INFO_BW_5:
1329         case RATE_INFO_BW_10:
1330         default:
1331                 goto warn;
1332         case RATE_INFO_BW_20:
1333                 idx = 0;
1334         }
1335
1336         bitrate = base[idx][rate->mcs];
1337         bitrate *= rate->nss;
1338
1339         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1340                 bitrate = (bitrate / 9) * 10;
1341
1342         /* do NOT round down here */
1343         return (bitrate + 50000) / 100000;
1344  warn:
1345         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1346                   rate->bw, rate->mcs, rate->nss);
1347         return 0;
1348 }
1349
1350 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1351 {
1352 #define SCALE 6144
1353         u32 mcs_divisors[14] = {
1354                 102399, /* 16.666666... */
1355                  51201, /*  8.333333... */
1356                  34134, /*  5.555555... */
1357                  25599, /*  4.166666... */
1358                  17067, /*  2.777777... */
1359                  12801, /*  2.083333... */
1360                  11769, /*  1.851851... */
1361                  10239, /*  1.666666... */
1362                   8532, /*  1.388888... */
1363                   7680, /*  1.250000... */
1364                   6828, /*  1.111111... */
1365                   6144, /*  1.000000... */
1366                   5690, /*  0.926106... */
1367                   5120, /*  0.833333... */
1368         };
1369         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1370         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1371         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1372         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1373         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1374         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1375         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1376         u64 tmp;
1377         u32 result;
1378
1379         if (WARN_ON_ONCE(rate->mcs > 13))
1380                 return 0;
1381
1382         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1383                 return 0;
1384         if (WARN_ON_ONCE(rate->he_ru_alloc >
1385                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1386                 return 0;
1387         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1388                 return 0;
1389
1390         if (rate->bw == RATE_INFO_BW_160)
1391                 result = rates_160M[rate->he_gi];
1392         else if (rate->bw == RATE_INFO_BW_80 ||
1393                  (rate->bw == RATE_INFO_BW_HE_RU &&
1394                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1395                 result = rates_969[rate->he_gi];
1396         else if (rate->bw == RATE_INFO_BW_40 ||
1397                  (rate->bw == RATE_INFO_BW_HE_RU &&
1398                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1399                 result = rates_484[rate->he_gi];
1400         else if (rate->bw == RATE_INFO_BW_20 ||
1401                  (rate->bw == RATE_INFO_BW_HE_RU &&
1402                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1403                 result = rates_242[rate->he_gi];
1404         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1405                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1406                 result = rates_106[rate->he_gi];
1407         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1408                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1409                 result = rates_52[rate->he_gi];
1410         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1411                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1412                 result = rates_26[rate->he_gi];
1413         else {
1414                 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1415                      rate->bw, rate->he_ru_alloc);
1416                 return 0;
1417         }
1418
1419         /* now scale to the appropriate MCS */
1420         tmp = result;
1421         tmp *= SCALE;
1422         do_div(tmp, mcs_divisors[rate->mcs]);
1423         result = tmp;
1424
1425         /* and take NSS, DCM into account */
1426         result = (result * rate->nss) / 8;
1427         if (rate->he_dcm)
1428                 result /= 2;
1429
1430         return result / 10000;
1431 }
1432
1433 static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
1434 {
1435 #define SCALE 6144
1436         static const u32 mcs_divisors[16] = {
1437                 102399, /* 16.666666... */
1438                  51201, /*  8.333333... */
1439                  34134, /*  5.555555... */
1440                  25599, /*  4.166666... */
1441                  17067, /*  2.777777... */
1442                  12801, /*  2.083333... */
1443                  11769, /*  1.851851... */
1444                  10239, /*  1.666666... */
1445                   8532, /*  1.388888... */
1446                   7680, /*  1.250000... */
1447                   6828, /*  1.111111... */
1448                   6144, /*  1.000000... */
1449                   5690, /*  0.926106... */
1450                   5120, /*  0.833333... */
1451                 409600, /* 66.666666... */
1452                 204800, /* 33.333333... */
1453         };
1454         static const u32 rates_996[3] =  { 480388888, 453700000, 408333333 };
1455         static const u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1456         static const u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1457         static const u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1458         static const u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1459         static const u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1460         u64 tmp;
1461         u32 result;
1462
1463         if (WARN_ON_ONCE(rate->mcs > 15))
1464                 return 0;
1465         if (WARN_ON_ONCE(rate->eht_gi > NL80211_RATE_INFO_EHT_GI_3_2))
1466                 return 0;
1467         if (WARN_ON_ONCE(rate->eht_ru_alloc >
1468                          NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1469                 return 0;
1470         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1471                 return 0;
1472
1473         /* Bandwidth checks for MCS 14 */
1474         if (rate->mcs == 14) {
1475                 if ((rate->bw != RATE_INFO_BW_EHT_RU &&
1476                      rate->bw != RATE_INFO_BW_80 &&
1477                      rate->bw != RATE_INFO_BW_160 &&
1478                      rate->bw != RATE_INFO_BW_320) ||
1479                     (rate->bw == RATE_INFO_BW_EHT_RU &&
1480                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_996 &&
1481                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_2x996 &&
1482                      rate->eht_ru_alloc != NL80211_RATE_INFO_EHT_RU_ALLOC_4x996)) {
1483                         WARN(1, "invalid EHT BW for MCS 14: bw:%d, ru:%d\n",
1484                              rate->bw, rate->eht_ru_alloc);
1485                         return 0;
1486                 }
1487         }
1488
1489         if (rate->bw == RATE_INFO_BW_320 ||
1490             (rate->bw == RATE_INFO_BW_EHT_RU &&
1491              rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_4x996))
1492                 result = 4 * rates_996[rate->eht_gi];
1493         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1494                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996P484)
1495                 result = 3 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1496         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1497                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_3x996)
1498                 result = 3 * rates_996[rate->eht_gi];
1499         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1500                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996P484)
1501                 result = 2 * rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1502         else if (rate->bw == RATE_INFO_BW_160 ||
1503                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1504                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_2x996))
1505                 result = 2 * rates_996[rate->eht_gi];
1506         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1507                  rate->eht_ru_alloc ==
1508                  NL80211_RATE_INFO_EHT_RU_ALLOC_996P484P242)
1509                 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi]
1510                          + rates_242[rate->eht_gi];
1511         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1512                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996P484)
1513                 result = rates_996[rate->eht_gi] + rates_484[rate->eht_gi];
1514         else if (rate->bw == RATE_INFO_BW_80 ||
1515                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1516                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_996))
1517                 result = rates_996[rate->eht_gi];
1518         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1519                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484P242)
1520                 result = rates_484[rate->eht_gi] + rates_242[rate->eht_gi];
1521         else if (rate->bw == RATE_INFO_BW_40 ||
1522                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1523                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_484))
1524                 result = rates_484[rate->eht_gi];
1525         else if (rate->bw == RATE_INFO_BW_20 ||
1526                  (rate->bw == RATE_INFO_BW_EHT_RU &&
1527                   rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_242))
1528                 result = rates_242[rate->eht_gi];
1529         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1530                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106P26)
1531                 result = rates_106[rate->eht_gi] + rates_26[rate->eht_gi];
1532         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1533                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_106)
1534                 result = rates_106[rate->eht_gi];
1535         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1536                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52P26)
1537                 result = rates_52[rate->eht_gi] + rates_26[rate->eht_gi];
1538         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1539                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_52)
1540                 result = rates_52[rate->eht_gi];
1541         else if (rate->bw == RATE_INFO_BW_EHT_RU &&
1542                  rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_26)
1543                 result = rates_26[rate->eht_gi];
1544         else {
1545                 WARN(1, "invalid EHT MCS: bw:%d, ru:%d\n",
1546                      rate->bw, rate->eht_ru_alloc);
1547                 return 0;
1548         }
1549
1550         /* now scale to the appropriate MCS */
1551         tmp = result;
1552         tmp *= SCALE;
1553         do_div(tmp, mcs_divisors[rate->mcs]);
1554         result = tmp;
1555
1556         /* and take NSS */
1557         result = (result * rate->nss) / 8;
1558
1559         return result / 10000;
1560 }
1561
1562 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1563 {
1564         if (rate->flags & RATE_INFO_FLAGS_MCS)
1565                 return cfg80211_calculate_bitrate_ht(rate);
1566         if (rate->flags & RATE_INFO_FLAGS_DMG)
1567                 return cfg80211_calculate_bitrate_dmg(rate);
1568         if (rate->flags & RATE_INFO_FLAGS_EXTENDED_SC_DMG)
1569                 return cfg80211_calculate_bitrate_extended_sc_dmg(rate);
1570         if (rate->flags & RATE_INFO_FLAGS_EDMG)
1571                 return cfg80211_calculate_bitrate_edmg(rate);
1572         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1573                 return cfg80211_calculate_bitrate_vht(rate);
1574         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1575                 return cfg80211_calculate_bitrate_he(rate);
1576         if (rate->flags & RATE_INFO_FLAGS_EHT_MCS)
1577                 return cfg80211_calculate_bitrate_eht(rate);
1578
1579         return rate->legacy;
1580 }
1581 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1582
1583 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1584                           enum ieee80211_p2p_attr_id attr,
1585                           u8 *buf, unsigned int bufsize)
1586 {
1587         u8 *out = buf;
1588         u16 attr_remaining = 0;
1589         bool desired_attr = false;
1590         u16 desired_len = 0;
1591
1592         while (len > 0) {
1593                 unsigned int iedatalen;
1594                 unsigned int copy;
1595                 const u8 *iedata;
1596
1597                 if (len < 2)
1598                         return -EILSEQ;
1599                 iedatalen = ies[1];
1600                 if (iedatalen + 2 > len)
1601                         return -EILSEQ;
1602
1603                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1604                         goto cont;
1605
1606                 if (iedatalen < 4)
1607                         goto cont;
1608
1609                 iedata = ies + 2;
1610
1611                 /* check WFA OUI, P2P subtype */
1612                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1613                     iedata[2] != 0x9a || iedata[3] != 0x09)
1614                         goto cont;
1615
1616                 iedatalen -= 4;
1617                 iedata += 4;
1618
1619                 /* check attribute continuation into this IE */
1620                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1621                 if (copy && desired_attr) {
1622                         desired_len += copy;
1623                         if (out) {
1624                                 memcpy(out, iedata, min(bufsize, copy));
1625                                 out += min(bufsize, copy);
1626                                 bufsize -= min(bufsize, copy);
1627                         }
1628
1629
1630                         if (copy == attr_remaining)
1631                                 return desired_len;
1632                 }
1633
1634                 attr_remaining -= copy;
1635                 if (attr_remaining)
1636                         goto cont;
1637
1638                 iedatalen -= copy;
1639                 iedata += copy;
1640
1641                 while (iedatalen > 0) {
1642                         u16 attr_len;
1643
1644                         /* P2P attribute ID & size must fit */
1645                         if (iedatalen < 3)
1646                                 return -EILSEQ;
1647                         desired_attr = iedata[0] == attr;
1648                         attr_len = get_unaligned_le16(iedata + 1);
1649                         iedatalen -= 3;
1650                         iedata += 3;
1651
1652                         copy = min_t(unsigned int, attr_len, iedatalen);
1653
1654                         if (desired_attr) {
1655                                 desired_len += copy;
1656                                 if (out) {
1657                                         memcpy(out, iedata, min(bufsize, copy));
1658                                         out += min(bufsize, copy);
1659                                         bufsize -= min(bufsize, copy);
1660                                 }
1661
1662                                 if (copy == attr_len)
1663                                         return desired_len;
1664                         }
1665
1666                         iedata += copy;
1667                         iedatalen -= copy;
1668                         attr_remaining = attr_len - copy;
1669                 }
1670
1671  cont:
1672                 len -= ies[1] + 2;
1673                 ies += ies[1] + 2;
1674         }
1675
1676         if (attr_remaining && desired_attr)
1677                 return -EILSEQ;
1678
1679         return -ENOENT;
1680 }
1681 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1682
1683 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1684 {
1685         int i;
1686
1687         /* Make sure array values are legal */
1688         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1689                 return false;
1690
1691         i = 0;
1692         while (i < n_ids) {
1693                 if (ids[i] == WLAN_EID_EXTENSION) {
1694                         if (id_ext && (ids[i + 1] == id))
1695                                 return true;
1696
1697                         i += 2;
1698                         continue;
1699                 }
1700
1701                 if (ids[i] == id && !id_ext)
1702                         return true;
1703
1704                 i++;
1705         }
1706         return false;
1707 }
1708
1709 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1710 {
1711         /* we assume a validly formed IEs buffer */
1712         u8 len = ies[pos + 1];
1713
1714         pos += 2 + len;
1715
1716         /* the IE itself must have 255 bytes for fragments to follow */
1717         if (len < 255)
1718                 return pos;
1719
1720         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1721                 len = ies[pos + 1];
1722                 pos += 2 + len;
1723         }
1724
1725         return pos;
1726 }
1727
1728 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1729                               const u8 *ids, int n_ids,
1730                               const u8 *after_ric, int n_after_ric,
1731                               size_t offset)
1732 {
1733         size_t pos = offset;
1734
1735         while (pos < ielen) {
1736                 u8 ext = 0;
1737
1738                 if (ies[pos] == WLAN_EID_EXTENSION)
1739                         ext = 2;
1740                 if ((pos + ext) >= ielen)
1741                         break;
1742
1743                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1744                                           ies[pos] == WLAN_EID_EXTENSION))
1745                         break;
1746
1747                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1748                         pos = skip_ie(ies, ielen, pos);
1749
1750                         while (pos < ielen) {
1751                                 if (ies[pos] == WLAN_EID_EXTENSION)
1752                                         ext = 2;
1753                                 else
1754                                         ext = 0;
1755
1756                                 if ((pos + ext) >= ielen)
1757                                         break;
1758
1759                                 if (!ieee80211_id_in_list(after_ric,
1760                                                           n_after_ric,
1761                                                           ies[pos + ext],
1762                                                           ext == 2))
1763                                         pos = skip_ie(ies, ielen, pos);
1764                                 else
1765                                         break;
1766                         }
1767                 } else {
1768                         pos = skip_ie(ies, ielen, pos);
1769                 }
1770         }
1771
1772         return pos;
1773 }
1774 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1775
1776 bool ieee80211_operating_class_to_band(u8 operating_class,
1777                                        enum nl80211_band *band)
1778 {
1779         switch (operating_class) {
1780         case 112:
1781         case 115 ... 127:
1782         case 128 ... 130:
1783                 *band = NL80211_BAND_5GHZ;
1784                 return true;
1785         case 131 ... 135:
1786                 *band = NL80211_BAND_6GHZ;
1787                 return true;
1788         case 81:
1789         case 82:
1790         case 83:
1791         case 84:
1792                 *band = NL80211_BAND_2GHZ;
1793                 return true;
1794         case 180:
1795                 *band = NL80211_BAND_60GHZ;
1796                 return true;
1797         }
1798
1799         return false;
1800 }
1801 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1802
1803 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1804                                           u8 *op_class)
1805 {
1806         u8 vht_opclass;
1807         u32 freq = chandef->center_freq1;
1808
1809         if (freq >= 2412 && freq <= 2472) {
1810                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1811                         return false;
1812
1813                 /* 2.407 GHz, channels 1..13 */
1814                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1815                         if (freq > chandef->chan->center_freq)
1816                                 *op_class = 83; /* HT40+ */
1817                         else
1818                                 *op_class = 84; /* HT40- */
1819                 } else {
1820                         *op_class = 81;
1821                 }
1822
1823                 return true;
1824         }
1825
1826         if (freq == 2484) {
1827                 /* channel 14 is only for IEEE 802.11b */
1828                 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1829                         return false;
1830
1831                 *op_class = 82; /* channel 14 */
1832                 return true;
1833         }
1834
1835         switch (chandef->width) {
1836         case NL80211_CHAN_WIDTH_80:
1837                 vht_opclass = 128;
1838                 break;
1839         case NL80211_CHAN_WIDTH_160:
1840                 vht_opclass = 129;
1841                 break;
1842         case NL80211_CHAN_WIDTH_80P80:
1843                 vht_opclass = 130;
1844                 break;
1845         case NL80211_CHAN_WIDTH_10:
1846         case NL80211_CHAN_WIDTH_5:
1847                 return false; /* unsupported for now */
1848         default:
1849                 vht_opclass = 0;
1850                 break;
1851         }
1852
1853         /* 5 GHz, channels 36..48 */
1854         if (freq >= 5180 && freq <= 5240) {
1855                 if (vht_opclass) {
1856                         *op_class = vht_opclass;
1857                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1858                         if (freq > chandef->chan->center_freq)
1859                                 *op_class = 116;
1860                         else
1861                                 *op_class = 117;
1862                 } else {
1863                         *op_class = 115;
1864                 }
1865
1866                 return true;
1867         }
1868
1869         /* 5 GHz, channels 52..64 */
1870         if (freq >= 5260 && freq <= 5320) {
1871                 if (vht_opclass) {
1872                         *op_class = vht_opclass;
1873                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1874                         if (freq > chandef->chan->center_freq)
1875                                 *op_class = 119;
1876                         else
1877                                 *op_class = 120;
1878                 } else {
1879                         *op_class = 118;
1880                 }
1881
1882                 return true;
1883         }
1884
1885         /* 5 GHz, channels 100..144 */
1886         if (freq >= 5500 && freq <= 5720) {
1887                 if (vht_opclass) {
1888                         *op_class = vht_opclass;
1889                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1890                         if (freq > chandef->chan->center_freq)
1891                                 *op_class = 122;
1892                         else
1893                                 *op_class = 123;
1894                 } else {
1895                         *op_class = 121;
1896                 }
1897
1898                 return true;
1899         }
1900
1901         /* 5 GHz, channels 149..169 */
1902         if (freq >= 5745 && freq <= 5845) {
1903                 if (vht_opclass) {
1904                         *op_class = vht_opclass;
1905                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1906                         if (freq > chandef->chan->center_freq)
1907                                 *op_class = 126;
1908                         else
1909                                 *op_class = 127;
1910                 } else if (freq <= 5805) {
1911                         *op_class = 124;
1912                 } else {
1913                         *op_class = 125;
1914                 }
1915
1916                 return true;
1917         }
1918
1919         /* 56.16 GHz, channel 1..4 */
1920         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1921                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1922                         return false;
1923
1924                 *op_class = 180;
1925                 return true;
1926         }
1927
1928         /* not supported yet */
1929         return false;
1930 }
1931 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1932
1933 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1934                                        u32 *beacon_int_gcd,
1935                                        bool *beacon_int_different)
1936 {
1937         struct wireless_dev *wdev;
1938
1939         *beacon_int_gcd = 0;
1940         *beacon_int_different = false;
1941
1942         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1943                 if (!wdev->beacon_interval)
1944                         continue;
1945
1946                 if (!*beacon_int_gcd) {
1947                         *beacon_int_gcd = wdev->beacon_interval;
1948                         continue;
1949                 }
1950
1951                 if (wdev->beacon_interval == *beacon_int_gcd)
1952                         continue;
1953
1954                 *beacon_int_different = true;
1955                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1956         }
1957
1958         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1959                 if (*beacon_int_gcd)
1960                         *beacon_int_different = true;
1961                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1962         }
1963 }
1964
1965 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1966                                  enum nl80211_iftype iftype, u32 beacon_int)
1967 {
1968         /*
1969          * This is just a basic pre-condition check; if interface combinations
1970          * are possible the driver must already be checking those with a call
1971          * to cfg80211_check_combinations(), in which case we'll validate more
1972          * through the cfg80211_calculate_bi_data() call and code in
1973          * cfg80211_iter_combinations().
1974          */
1975
1976         if (beacon_int < 10 || beacon_int > 10000)
1977                 return -EINVAL;
1978
1979         return 0;
1980 }
1981
1982 int cfg80211_iter_combinations(struct wiphy *wiphy,
1983                                struct iface_combination_params *params,
1984                                void (*iter)(const struct ieee80211_iface_combination *c,
1985                                             void *data),
1986                                void *data)
1987 {
1988         const struct ieee80211_regdomain *regdom;
1989         enum nl80211_dfs_regions region = 0;
1990         int i, j, iftype;
1991         int num_interfaces = 0;
1992         u32 used_iftypes = 0;
1993         u32 beacon_int_gcd;
1994         bool beacon_int_different;
1995
1996         /*
1997          * This is a bit strange, since the iteration used to rely only on
1998          * the data given by the driver, but here it now relies on context,
1999          * in form of the currently operating interfaces.
2000          * This is OK for all current users, and saves us from having to
2001          * push the GCD calculations into all the drivers.
2002          * In the future, this should probably rely more on data that's in
2003          * cfg80211 already - the only thing not would appear to be any new
2004          * interfaces (while being brought up) and channel/radar data.
2005          */
2006         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
2007                                    &beacon_int_gcd, &beacon_int_different);
2008
2009         if (params->radar_detect) {
2010                 rcu_read_lock();
2011                 regdom = rcu_dereference(cfg80211_regdomain);
2012                 if (regdom)
2013                         region = regdom->dfs_region;
2014                 rcu_read_unlock();
2015         }
2016
2017         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2018                 num_interfaces += params->iftype_num[iftype];
2019                 if (params->iftype_num[iftype] > 0 &&
2020                     !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2021                         used_iftypes |= BIT(iftype);
2022         }
2023
2024         for (i = 0; i < wiphy->n_iface_combinations; i++) {
2025                 const struct ieee80211_iface_combination *c;
2026                 struct ieee80211_iface_limit *limits;
2027                 u32 all_iftypes = 0;
2028
2029                 c = &wiphy->iface_combinations[i];
2030
2031                 if (num_interfaces > c->max_interfaces)
2032                         continue;
2033                 if (params->num_different_channels > c->num_different_channels)
2034                         continue;
2035
2036                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
2037                                  GFP_KERNEL);
2038                 if (!limits)
2039                         return -ENOMEM;
2040
2041                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
2042                         if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
2043                                 continue;
2044                         for (j = 0; j < c->n_limits; j++) {
2045                                 all_iftypes |= limits[j].types;
2046                                 if (!(limits[j].types & BIT(iftype)))
2047                                         continue;
2048                                 if (limits[j].max < params->iftype_num[iftype])
2049                                         goto cont;
2050                                 limits[j].max -= params->iftype_num[iftype];
2051                         }
2052                 }
2053
2054                 if (params->radar_detect !=
2055                         (c->radar_detect_widths & params->radar_detect))
2056                         goto cont;
2057
2058                 if (params->radar_detect && c->radar_detect_regions &&
2059                     !(c->radar_detect_regions & BIT(region)))
2060                         goto cont;
2061
2062                 /* Finally check that all iftypes that we're currently
2063                  * using are actually part of this combination. If they
2064                  * aren't then we can't use this combination and have
2065                  * to continue to the next.
2066                  */
2067                 if ((all_iftypes & used_iftypes) != used_iftypes)
2068                         goto cont;
2069
2070                 if (beacon_int_gcd) {
2071                         if (c->beacon_int_min_gcd &&
2072                             beacon_int_gcd < c->beacon_int_min_gcd)
2073                                 goto cont;
2074                         if (!c->beacon_int_min_gcd && beacon_int_different)
2075                                 goto cont;
2076                 }
2077
2078                 /* This combination covered all interface types and
2079                  * supported the requested numbers, so we're good.
2080                  */
2081
2082                 (*iter)(c, data);
2083  cont:
2084                 kfree(limits);
2085         }
2086
2087         return 0;
2088 }
2089 EXPORT_SYMBOL(cfg80211_iter_combinations);
2090
2091 static void
2092 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
2093                           void *data)
2094 {
2095         int *num = data;
2096         (*num)++;
2097 }
2098
2099 int cfg80211_check_combinations(struct wiphy *wiphy,
2100                                 struct iface_combination_params *params)
2101 {
2102         int err, num = 0;
2103
2104         err = cfg80211_iter_combinations(wiphy, params,
2105                                          cfg80211_iter_sum_ifcombs, &num);
2106         if (err)
2107                 return err;
2108         if (num == 0)
2109                 return -EBUSY;
2110
2111         return 0;
2112 }
2113 EXPORT_SYMBOL(cfg80211_check_combinations);
2114
2115 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
2116                            const u8 *rates, unsigned int n_rates,
2117                            u32 *mask)
2118 {
2119         int i, j;
2120
2121         if (!sband)
2122                 return -EINVAL;
2123
2124         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
2125                 return -EINVAL;
2126
2127         *mask = 0;
2128
2129         for (i = 0; i < n_rates; i++) {
2130                 int rate = (rates[i] & 0x7f) * 5;
2131                 bool found = false;
2132
2133                 for (j = 0; j < sband->n_bitrates; j++) {
2134                         if (sband->bitrates[j].bitrate == rate) {
2135                                 found = true;
2136                                 *mask |= BIT(j);
2137                                 break;
2138                         }
2139                 }
2140                 if (!found)
2141                         return -EINVAL;
2142         }
2143
2144         /*
2145          * mask must have at least one bit set here since we
2146          * didn't accept a 0-length rates array nor allowed
2147          * entries in the array that didn't exist
2148          */
2149
2150         return 0;
2151 }
2152
2153 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
2154 {
2155         enum nl80211_band band;
2156         unsigned int n_channels = 0;
2157
2158         for (band = 0; band < NUM_NL80211_BANDS; band++)
2159                 if (wiphy->bands[band])
2160                         n_channels += wiphy->bands[band]->n_channels;
2161
2162         return n_channels;
2163 }
2164 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
2165
2166 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
2167                          struct station_info *sinfo)
2168 {
2169         struct cfg80211_registered_device *rdev;
2170         struct wireless_dev *wdev;
2171
2172         wdev = dev->ieee80211_ptr;
2173         if (!wdev)
2174                 return -EOPNOTSUPP;
2175
2176         rdev = wiphy_to_rdev(wdev->wiphy);
2177         if (!rdev->ops->get_station)
2178                 return -EOPNOTSUPP;
2179
2180         memset(sinfo, 0, sizeof(*sinfo));
2181
2182         return rdev_get_station(rdev, dev, mac_addr, sinfo);
2183 }
2184 EXPORT_SYMBOL(cfg80211_get_station);
2185
2186 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
2187 {
2188         int i;
2189
2190         if (!f)
2191                 return;
2192
2193         kfree(f->serv_spec_info);
2194         kfree(f->srf_bf);
2195         kfree(f->srf_macs);
2196         for (i = 0; i < f->num_rx_filters; i++)
2197                 kfree(f->rx_filters[i].filter);
2198
2199         for (i = 0; i < f->num_tx_filters; i++)
2200                 kfree(f->tx_filters[i].filter);
2201
2202         kfree(f->rx_filters);
2203         kfree(f->tx_filters);
2204         kfree(f);
2205 }
2206 EXPORT_SYMBOL(cfg80211_free_nan_func);
2207
2208 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
2209                                 u32 center_freq_khz, u32 bw_khz)
2210 {
2211         u32 start_freq_khz, end_freq_khz;
2212
2213         start_freq_khz = center_freq_khz - (bw_khz / 2);
2214         end_freq_khz = center_freq_khz + (bw_khz / 2);
2215
2216         if (start_freq_khz >= freq_range->start_freq_khz &&
2217             end_freq_khz <= freq_range->end_freq_khz)
2218                 return true;
2219
2220         return false;
2221 }
2222
2223 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
2224 {
2225         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
2226                                 sizeof(*(sinfo->pertid)),
2227                                 gfp);
2228         if (!sinfo->pertid)
2229                 return -ENOMEM;
2230
2231         return 0;
2232 }
2233 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
2234
2235 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
2236 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
2237 const unsigned char rfc1042_header[] __aligned(2) =
2238         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
2239 EXPORT_SYMBOL(rfc1042_header);
2240
2241 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2242 const unsigned char bridge_tunnel_header[] __aligned(2) =
2243         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2244 EXPORT_SYMBOL(bridge_tunnel_header);
2245
2246 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2247 struct iapp_layer2_update {
2248         u8 da[ETH_ALEN];        /* broadcast */
2249         u8 sa[ETH_ALEN];        /* STA addr */
2250         __be16 len;             /* 6 */
2251         u8 dsap;                /* 0 */
2252         u8 ssap;                /* 0 */
2253         u8 control;
2254         u8 xid_info[3];
2255 } __packed;
2256
2257 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2258 {
2259         struct iapp_layer2_update *msg;
2260         struct sk_buff *skb;
2261
2262         /* Send Level 2 Update Frame to update forwarding tables in layer 2
2263          * bridge devices */
2264
2265         skb = dev_alloc_skb(sizeof(*msg));
2266         if (!skb)
2267                 return;
2268         msg = skb_put(skb, sizeof(*msg));
2269
2270         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2271          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2272
2273         eth_broadcast_addr(msg->da);
2274         ether_addr_copy(msg->sa, addr);
2275         msg->len = htons(6);
2276         msg->dsap = 0;
2277         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
2278         msg->control = 0xaf;    /* XID response lsb.1111F101.
2279                                  * F=0 (no poll command; unsolicited frame) */
2280         msg->xid_info[0] = 0x81;        /* XID format identifier */
2281         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
2282         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
2283
2284         skb->dev = dev;
2285         skb->protocol = eth_type_trans(skb, dev);
2286         memset(skb->cb, 0, sizeof(skb->cb));
2287         netif_rx(skb);
2288 }
2289 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2290
2291 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2292                               enum ieee80211_vht_chanwidth bw,
2293                               int mcs, bool ext_nss_bw_capable,
2294                               unsigned int max_vht_nss)
2295 {
2296         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2297         int ext_nss_bw;
2298         int supp_width;
2299         int i, mcs_encoding;
2300
2301         if (map == 0xffff)
2302                 return 0;
2303
2304         if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2305                 return 0;
2306         if (mcs <= 7)
2307                 mcs_encoding = 0;
2308         else if (mcs == 8)
2309                 mcs_encoding = 1;
2310         else
2311                 mcs_encoding = 2;
2312
2313         if (!max_vht_nss) {
2314                 /* find max_vht_nss for the given MCS */
2315                 for (i = 7; i >= 0; i--) {
2316                         int supp = (map >> (2 * i)) & 3;
2317
2318                         if (supp == 3)
2319                                 continue;
2320
2321                         if (supp >= mcs_encoding) {
2322                                 max_vht_nss = i + 1;
2323                                 break;
2324                         }
2325                 }
2326         }
2327
2328         if (!(cap->supp_mcs.tx_mcs_map &
2329                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2330                 return max_vht_nss;
2331
2332         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2333                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2334         supp_width = le32_get_bits(cap->vht_cap_info,
2335                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2336
2337         /* if not capable, treat ext_nss_bw as 0 */
2338         if (!ext_nss_bw_capable)
2339                 ext_nss_bw = 0;
2340
2341         /* This is invalid */
2342         if (supp_width == 3)
2343                 return 0;
2344
2345         /* This is an invalid combination so pretend nothing is supported */
2346         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2347                 return 0;
2348
2349         /*
2350          * Cover all the special cases according to IEEE 802.11-2016
2351          * Table 9-250. All other cases are either factor of 1 or not
2352          * valid/supported.
2353          */
2354         switch (bw) {
2355         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2356         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2357                 if ((supp_width == 1 || supp_width == 2) &&
2358                     ext_nss_bw == 3)
2359                         return 2 * max_vht_nss;
2360                 break;
2361         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2362                 if (supp_width == 0 &&
2363                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2364                         return max_vht_nss / 2;
2365                 if (supp_width == 0 &&
2366                     ext_nss_bw == 3)
2367                         return (3 * max_vht_nss) / 4;
2368                 if (supp_width == 1 &&
2369                     ext_nss_bw == 3)
2370                         return 2 * max_vht_nss;
2371                 break;
2372         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2373                 if (supp_width == 0 && ext_nss_bw == 1)
2374                         return 0; /* not possible */
2375                 if (supp_width == 0 &&
2376                     ext_nss_bw == 2)
2377                         return max_vht_nss / 2;
2378                 if (supp_width == 0 &&
2379                     ext_nss_bw == 3)
2380                         return (3 * max_vht_nss) / 4;
2381                 if (supp_width == 1 &&
2382                     ext_nss_bw == 0)
2383                         return 0; /* not possible */
2384                 if (supp_width == 1 &&
2385                     ext_nss_bw == 1)
2386                         return max_vht_nss / 2;
2387                 if (supp_width == 1 &&
2388                     ext_nss_bw == 2)
2389                         return (3 * max_vht_nss) / 4;
2390                 break;
2391         }
2392
2393         /* not covered or invalid combination received */
2394         return max_vht_nss;
2395 }
2396 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2397
2398 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2399                              bool is_4addr, u8 check_swif)
2400
2401 {
2402         bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2403
2404         switch (check_swif) {
2405         case 0:
2406                 if (is_vlan && is_4addr)
2407                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2408                 return wiphy->interface_modes & BIT(iftype);
2409         case 1:
2410                 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2411                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2412                 return wiphy->software_iftypes & BIT(iftype);
2413         default:
2414                 break;
2415         }
2416
2417         return false;
2418 }
2419 EXPORT_SYMBOL(cfg80211_iftype_allowed);