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) 2018-2020 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 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                 if (chan == 14)
  84                         return MHZ_TO_KHZ(2484);
  85                 else if (chan < 14)
  86                         return MHZ_TO_KHZ(2407 + chan * 5);
  87                 break;
  88         case NL80211_BAND_5GHZ:
  89                 if (chan >= 182 && chan <= 196)
  90                         return MHZ_TO_KHZ(4000 + chan * 5);
  91                 else
  92                         return MHZ_TO_KHZ(5000 + chan * 5);
  93                 break;
  94         case NL80211_BAND_6GHZ:
  95                 /* see 802.11ax D6.1 27.3.23.2 */
  96                 if (chan == 2)
  97                         return MHZ_TO_KHZ(5935);
  98                 if (chan <= 253)
  99                         return MHZ_TO_KHZ(5950 + chan * 5);
 100                 break;
 101         case NL80211_BAND_60GHZ:
 102                 if (chan < 7)
 103                         return MHZ_TO_KHZ(56160 + chan * 2160);
 104                 break;
 105         case NL80211_BAND_S1GHZ:
 106                 return 902000 + chan * 500;
 107         default:
 108                 ;
 109         }
 110         return 0; /* not supported */
 111 }
 112 EXPORT_SYMBOL(ieee80211_channel_to_freq_khz);
 113
 114 int ieee80211_freq_khz_to_channel(u32 freq)
 115 {
 116         /* TODO: just handle MHz for now */
 117         freq = KHZ_TO_MHZ(freq);
 118
 119         /* see 802.11 17.3.8.3.2 and Annex J */
 120         if (freq == 2484)
 121                 return 14;
 122         else if (freq < 2484)
 123                 return (freq - 2407) / 5;
 124         else if (freq >= 4910 && freq <= 4980)
 125                 return (freq - 4000) / 5;
 126         else if (freq < 5945)
 127                 return (freq - 5000) / 5;
 128         else if (freq <= 45000) /* DMG band lower limit */
 129                 /* see 802.11ax D4.1 27.3.22.2 */
 130                 return (freq - 5940) / 5;
 131         else if (freq >= 58320 && freq <= 70200)
 132                 return (freq - 56160) / 2160;
 133         else
 134                 return 0;
 135 }
 136 EXPORT_SYMBOL(ieee80211_freq_khz_to_channel);
 137
 138 struct ieee80211_channel *ieee80211_get_channel_khz(struct wiphy *wiphy,
 139                                                     u32 freq)
 140 {
 141         enum nl80211_band band;
 142         struct ieee80211_supported_band *sband;
 143         int i;
 144
 145         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 146                 sband = wiphy->bands[band];
 147
 148                 if (!sband)
 149                         continue;
 150
 151                 for (i = 0; i < sband->n_channels; i++) {
 152                         struct ieee80211_channel *chan = &sband->channels[i];
 153
 154                         if (ieee80211_channel_to_khz(chan) == freq)
 155                                 return chan;
 156                 }
 157         }
 158
 159         return NULL;
 160 }
 161 EXPORT_SYMBOL(ieee80211_get_channel_khz);
 162
 163 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 164 {
 165         int i, want;
 166
 167         switch (sband->band) {
 168         case NL80211_BAND_5GHZ:
 169         case NL80211_BAND_6GHZ:
 170                 want = 3;
 171                 for (i = 0; i < sband->n_bitrates; i++) {
 172                         if (sband->bitrates[i].bitrate == 60 ||
 173                             sband->bitrates[i].bitrate == 120 ||
 174                             sband->bitrates[i].bitrate == 240) {
 175                                 sband->bitrates[i].flags |=
 176                                         IEEE80211_RATE_MANDATORY_A;
 177                                 want--;
 178                         }
 179                 }
 180                 WARN_ON(want);
 181                 break;
 182         case NL80211_BAND_2GHZ:
 183                 want = 7;
 184                 for (i = 0; i < sband->n_bitrates; i++) {
 185                         switch (sband->bitrates[i].bitrate) {
 186                         case 10:
 187                         case 20:
 188                         case 55:
 189                         case 110:
 190                                 sband->bitrates[i].flags |=
 191                                         IEEE80211_RATE_MANDATORY_B |
 192                                         IEEE80211_RATE_MANDATORY_G;
 193                                 want--;
 194                                 break;
 195                         case 60:
 196                         case 120:
 197                         case 240:
 198                                 sband->bitrates[i].flags |=
 199                                         IEEE80211_RATE_MANDATORY_G;
 200                                 want--;
 201                                 fallthrough;
 202                         default:
 203                                 sband->bitrates[i].flags |=
 204                                         IEEE80211_RATE_ERP_G;
 205                                 break;
 206                         }
 207                 }
 208                 WARN_ON(want != 0 && want != 3);
 209                 break;
 210         case NL80211_BAND_60GHZ:
 211                 /* check for mandatory HT MCS 1..4 */
 212                 WARN_ON(!sband->ht_cap.ht_supported);
 213                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 214                 break;
 215         case NL80211_BAND_S1GHZ:
 216                 /* Figure 9-589bd: 3 means unsupported, so != 3 means at least
 217                  * mandatory is ok.
 218                  */
 219                 WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
 220                 break;
 221         case NUM_NL80211_BANDS:
 222         default:
 223                 WARN_ON(1);
 224                 break;
 225         }
 226 }
 227
 228 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 229 {
 230         enum nl80211_band band;
 231
 232         for (band = 0; band < NUM_NL80211_BANDS; band++)
 233                 if (wiphy->bands[band])
 234                         set_mandatory_flags_band(wiphy->bands[band]);
 235 }
 236
 237 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 238 {
 239         int i;
 240         for (i = 0; i < wiphy->n_cipher_suites; i++)
 241                 if (cipher == wiphy->cipher_suites[i])
 242                         return true;
 243         return false;
 244 }
 245
 246 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 247                                    struct key_params *params, int key_idx,
 248                                    bool pairwise, const u8 *mac_addr)
 249 {
 250         int max_key_idx = 5;
 251
 252         if (wiphy_ext_feature_isset(&rdev->wiphy,
 253                                     NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
 254             wiphy_ext_feature_isset(&rdev->wiphy,
 255                                     NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
 256                 max_key_idx = 7;
 257         if (key_idx < 0 || key_idx > max_key_idx)
 258                 return -EINVAL;
 259
 260         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 261                 return -EINVAL;
 262
 263         if (pairwise && !mac_addr)
 264                 return -EINVAL;
 265
 266         switch (params->cipher) {
 267         case WLAN_CIPHER_SUITE_TKIP:
 268                 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
 269                 if ((pairwise && key_idx) ||
 270                     params->mode != NL80211_KEY_RX_TX)
 271                         return -EINVAL;
 272                 break;
 273         case WLAN_CIPHER_SUITE_CCMP:
 274         case WLAN_CIPHER_SUITE_CCMP_256:
 275         case WLAN_CIPHER_SUITE_GCMP:
 276         case WLAN_CIPHER_SUITE_GCMP_256:
 277                 /* IEEE802.11-2016 allows only 0 and - when supporting
 278                  * Extended Key ID - 1 as index for pairwise keys.
 279                  * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
 280                  * the driver supports Extended Key ID.
 281                  * @NL80211_KEY_SET_TX can't be set when installing and
 282                  * validating a key.
 283                  */
 284                 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
 285                     params->mode == NL80211_KEY_SET_TX)
 286                         return -EINVAL;
 287                 if (wiphy_ext_feature_isset(&rdev->wiphy,
 288                                             NL80211_EXT_FEATURE_EXT_KEY_ID)) {
 289                         if (pairwise && (key_idx < 0 || key_idx > 1))
 290                                 return -EINVAL;
 291                 } else if (pairwise && key_idx) {
 292                         return -EINVAL;
 293                 }
 294                 break;
 295         case WLAN_CIPHER_SUITE_AES_CMAC:
 296         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 297         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 298         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 299                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 300                 if (pairwise)
 301                         return -EINVAL;
 302                 if (key_idx < 4)
 303                         return -EINVAL;
 304                 break;
 305         case WLAN_CIPHER_SUITE_WEP40:
 306         case WLAN_CIPHER_SUITE_WEP104:
 307                 if (key_idx > 3)
 308                         return -EINVAL;
 309         default:
 310                 break;
 311         }
 312
 313         switch (params->cipher) {
 314         case WLAN_CIPHER_SUITE_WEP40:
 315                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 316                         return -EINVAL;
 317                 break;
 318         case WLAN_CIPHER_SUITE_TKIP:
 319                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 320                         return -EINVAL;
 321                 break;
 322         case WLAN_CIPHER_SUITE_CCMP:
 323                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 324                         return -EINVAL;
 325                 break;
 326         case WLAN_CIPHER_SUITE_CCMP_256:
 327                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 328                         return -EINVAL;
 329                 break;
 330         case WLAN_CIPHER_SUITE_GCMP:
 331                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 332                         return -EINVAL;
 333                 break;
 334         case WLAN_CIPHER_SUITE_GCMP_256:
 335                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 336                         return -EINVAL;
 337                 break;
 338         case WLAN_CIPHER_SUITE_WEP104:
 339                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 340                         return -EINVAL;
 341                 break;
 342         case WLAN_CIPHER_SUITE_AES_CMAC:
 343                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 344                         return -EINVAL;
 345                 break;
 346         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 347                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 348                         return -EINVAL;
 349                 break;
 350         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 351                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 352                         return -EINVAL;
 353                 break;
 354         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 355                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 356                         return -EINVAL;
 357                 break;
 358         default:
 359                 /*
 360                  * We don't know anything about this algorithm,
 361                  * allow using it -- but the driver must check
 362                  * all parameters! We still check below whether
 363                  * or not the driver supports this algorithm,
 364                  * of course.
 365                  */
 366                 break;
 367         }
 368
 369         if (params->seq) {
 370                 switch (params->cipher) {
 371                 case WLAN_CIPHER_SUITE_WEP40:
 372                 case WLAN_CIPHER_SUITE_WEP104:
 373                         /* These ciphers do not use key sequence */
 374                         return -EINVAL;
 375                 case WLAN_CIPHER_SUITE_TKIP:
 376                 case WLAN_CIPHER_SUITE_CCMP:
 377                 case WLAN_CIPHER_SUITE_CCMP_256:
 378                 case WLAN_CIPHER_SUITE_GCMP:
 379                 case WLAN_CIPHER_SUITE_GCMP_256:
 380                 case WLAN_CIPHER_SUITE_AES_CMAC:
 381                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 382                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 383                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 384                         if (params->seq_len != 6)
 385                                 return -EINVAL;
 386                         break;
 387                 }
 388         }
 389
 390         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 391                 return -EINVAL;
 392
 393         return 0;
 394 }
 395
 396 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 397 {
 398         unsigned int hdrlen = 24;
 399
 400         if (ieee80211_is_data(fc)) {
 401                 if (ieee80211_has_a4(fc))
 402                         hdrlen = 30;
 403                 if (ieee80211_is_data_qos(fc)) {
 404                         hdrlen += IEEE80211_QOS_CTL_LEN;
 405                         if (ieee80211_has_order(fc))
 406                                 hdrlen += IEEE80211_HT_CTL_LEN;
 407                 }
 408                 goto out;
 409         }
 410
 411         if (ieee80211_is_mgmt(fc)) {
 412                 if (ieee80211_has_order(fc))
 413                         hdrlen += IEEE80211_HT_CTL_LEN;
 414                 goto out;
 415         }
 416
 417         if (ieee80211_is_ctl(fc)) {
 418                 /*
 419                  * ACK and CTS are 10 bytes, all others 16. To see how
 420                  * to get this condition consider
 421                  *   subtype mask:   0b0000000011110000 (0x00F0)
 422                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 423                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 424                  *   bits that matter:         ^^^      (0x00E0)
 425                  *   value of those: 0b0000000011000000 (0x00C0)
 426                  */
 427                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 428                         hdrlen = 10;
 429                 else
 430                         hdrlen = 16;
 431         }
 432 out:
 433         return hdrlen;
 434 }
 435 EXPORT_SYMBOL(ieee80211_hdrlen);
 436
 437 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 438 {
 439         const struct ieee80211_hdr *hdr =
 440                         (const struct ieee80211_hdr *)skb->data;
 441         unsigned int hdrlen;
 442
 443         if (unlikely(skb->len < 10))
 444                 return 0;
 445         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 446         if (unlikely(hdrlen > skb->len))
 447                 return 0;
 448         return hdrlen;
 449 }
 450 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 451
 452 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 453 {
 454         int ae = flags & MESH_FLAGS_AE;
 455         /* 802.11-2012, 8.2.4.7.3 */
 456         switch (ae) {
 457         default:
 458         case 0:
 459                 return 6;
 460         case MESH_FLAGS_AE_A4:
 461                 return 12;
 462         case MESH_FLAGS_AE_A5_A6:
 463                 return 18;
 464         }
 465 }
 466
 467 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 468 {
 469         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 470 }
 471 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 472
 473 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 474                                   const u8 *addr, enum nl80211_iftype iftype,
 475                                   u8 data_offset)
 476 {
 477         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 478         struct {
 479                 u8 hdr[ETH_ALEN] __aligned(2);
 480                 __be16 proto;
 481         } payload;
 482         struct ethhdr tmp;
 483         u16 hdrlen;
 484         u8 mesh_flags = 0;
 485
 486         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 487                 return -1;
 488
 489         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 490         if (skb->len < hdrlen + 8)
 491                 return -1;
 492
 493         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 494          * header
 495          * IEEE 802.11 address fields:
 496          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 497          *   0     0   DA    SA    BSSID n/a
 498          *   0     1   DA    BSSID SA    n/a
 499          *   1     0   BSSID SA    DA    n/a
 500          *   1     1   RA    TA    DA    SA
 501          */
 502         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 503         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 504
 505         if (iftype == NL80211_IFTYPE_MESH_POINT)
 506                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 507
 508         mesh_flags &= MESH_FLAGS_AE;
 509
 510         switch (hdr->frame_control &
 511                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 512         case cpu_to_le16(IEEE80211_FCTL_TODS):
 513                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 514                              iftype != NL80211_IFTYPE_AP_VLAN &&
 515                              iftype != NL80211_IFTYPE_P2P_GO))
 516                         return -1;
 517                 break;
 518         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 519                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 520                              iftype != NL80211_IFTYPE_MESH_POINT &&
 521                              iftype != NL80211_IFTYPE_AP_VLAN &&
 522                              iftype != NL80211_IFTYPE_STATION))
 523                         return -1;
 524                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 525                         if (mesh_flags == MESH_FLAGS_AE_A4)
 526                                 return -1;
 527                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 528                                 skb_copy_bits(skb, hdrlen +
 529                                         offsetof(struct ieee80211s_hdr, eaddr1),
 530                                         tmp.h_dest, 2 * ETH_ALEN);
 531                         }
 532                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 533                 }
 534                 break;
 535         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 536                 if ((iftype != NL80211_IFTYPE_STATION &&
 537                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 538                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 539                     (is_multicast_ether_addr(tmp.h_dest) &&
 540                      ether_addr_equal(tmp.h_source, addr)))
 541                         return -1;
 542                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 543                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 544                                 return -1;
 545                         if (mesh_flags == MESH_FLAGS_AE_A4)
 546                                 skb_copy_bits(skb, hdrlen +
 547                                         offsetof(struct ieee80211s_hdr, eaddr1),
 548                                         tmp.h_source, ETH_ALEN);
 549                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 550                 }
 551                 break;
 552         case cpu_to_le16(0):
 553                 if (iftype != NL80211_IFTYPE_ADHOC &&
 554                     iftype != NL80211_IFTYPE_STATION &&
 555                     iftype != NL80211_IFTYPE_OCB)
 556                                 return -1;
 557                 break;
 558         }
 559
 560         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 561         tmp.h_proto = payload.proto;
 562
 563         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 564                     tmp.h_proto != htons(ETH_P_AARP) &&
 565                     tmp.h_proto != htons(ETH_P_IPX)) ||
 566                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 567                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 568                  * replace EtherType */
 569                 hdrlen += ETH_ALEN + 2;
 570         else
 571                 tmp.h_proto = htons(skb->len - hdrlen);
 572
 573         pskb_pull(skb, hdrlen);
 574
 575         if (!ehdr)
 576                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 577         memcpy(ehdr, &tmp, sizeof(tmp));
 578
 579         return 0;
 580 }
 581 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 582
 583 static void
 584 __frame_add_frag(struct sk_buff *skb, struct page *page,
 585                  void *ptr, int len, int size)
 586 {
 587         struct skb_shared_info *sh = skb_shinfo(skb);
 588         int page_offset;
 589
 590         get_page(page);
 591         page_offset = ptr - page_address(page);
 592         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 593 }
 594
 595 static void
 596 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 597                             int offset, int len)
 598 {
 599         struct skb_shared_info *sh = skb_shinfo(skb);
 600         const skb_frag_t *frag = &sh->frags[0];
 601         struct page *frag_page;
 602         void *frag_ptr;
 603         int frag_len, frag_size;
 604         int head_size = skb->len - skb->data_len;
 605         int cur_len;
 606
 607         frag_page = virt_to_head_page(skb->head);
 608         frag_ptr = skb->data;
 609         frag_size = head_size;
 610
 611         while (offset >= frag_size) {
 612                 offset -= frag_size;
 613                 frag_page = skb_frag_page(frag);
 614                 frag_ptr = skb_frag_address(frag);
 615                 frag_size = skb_frag_size(frag);
 616                 frag++;
 617         }
 618
 619         frag_ptr += offset;
 620         frag_len = frag_size - offset;
 621
 622         cur_len = min(len, frag_len);
 623
 624         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 625         len -= cur_len;
 626
 627         while (len > 0) {
 628                 frag_len = skb_frag_size(frag);
 629                 cur_len = min(len, frag_len);
 630                 __frame_add_frag(frame, skb_frag_page(frag),
 631                                  skb_frag_address(frag), cur_len, frag_len);
 632                 len -= cur_len;
 633                 frag++;
 634         }
 635 }
 636
 637 static struct sk_buff *
 638 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 639                        int offset, int len, bool reuse_frag)
 640 {
 641         struct sk_buff *frame;
 642         int cur_len = len;
 643
 644         if (skb->len - offset < len)
 645                 return NULL;
 646
 647         /*
 648          * When reusing framents, copy some data to the head to simplify
 649          * ethernet header handling and speed up protocol header processing
 650          * in the stack later.
 651          */
 652         if (reuse_frag)
 653                 cur_len = min_t(int, len, 32);
 654
 655         /*
 656          * Allocate and reserve two bytes more for payload
 657          * alignment since sizeof(struct ethhdr) is 14.
 658          */
 659         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 660         if (!frame)
 661                 return NULL;
 662
 663         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 664         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 665
 666         len -= cur_len;
 667         if (!len)
 668                 return frame;
 669
 670         offset += cur_len;
 671         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 672
 673         return frame;
 674 }
 675
 676 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 677                               const u8 *addr, enum nl80211_iftype iftype,
 678                               const unsigned int extra_headroom,
 679                               const u8 *check_da, const u8 *check_sa)
 680 {
 681         unsigned int hlen = ALIGN(extra_headroom, 4);
 682         struct sk_buff *frame = NULL;
 683         u16 ethertype;
 684         u8 *payload;
 685         int offset = 0, remaining;
 686         struct ethhdr eth;
 687         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 688         bool reuse_skb = false;
 689         bool last = false;
 690
 691         while (!last) {
 692                 unsigned int subframe_len;
 693                 int len;
 694                 u8 padding;
 695
 696                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 697                 len = ntohs(eth.h_proto);
 698                 subframe_len = sizeof(struct ethhdr) + len;
 699                 padding = (4 - subframe_len) & 0x3;
 700
 701                 /* the last MSDU has no padding */
 702                 remaining = skb->len - offset;
 703                 if (subframe_len > remaining)
 704                         goto purge;
 705
 706                 offset += sizeof(struct ethhdr);
 707                 last = remaining <= subframe_len + padding;
 708
 709                 /* FIXME: should we really accept multicast DA? */
 710                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 711                      !ether_addr_equal(check_da, eth.h_dest)) ||
 712                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 713                         offset += len + padding;
 714                         continue;
 715                 }
 716
 717                 /* reuse skb for the last subframe */
 718                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 719                         skb_pull(skb, offset);
 720                         frame = skb;
 721                         reuse_skb = true;
 722                 } else {
 723                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 724                                                        reuse_frag);
 725                         if (!frame)
 726                                 goto purge;
 727
 728                         offset += len + padding;
 729                 }
 730
 731                 skb_reset_network_header(frame);
 732                 frame->dev = skb->dev;
 733                 frame->priority = skb->priority;
 734
 735                 payload = frame->data;
 736                 ethertype = (payload[6] << 8) | payload[7];
 737                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 738                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 739                            ether_addr_equal(payload, bridge_tunnel_header))) {
 740                         eth.h_proto = htons(ethertype);
 741                         skb_pull(frame, ETH_ALEN + 2);
 742                 }
 743
 744                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 745                 __skb_queue_tail(list, frame);
 746         }
 747
 748         if (!reuse_skb)
 749                 dev_kfree_skb(skb);
 750
 751         return;
 752
 753  purge:
 754         __skb_queue_purge(list);
 755         dev_kfree_skb(skb);
 756 }
 757 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 758
 759 /* Given a data frame determine the 802.1p/1d tag to use. */
 760 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 761                                     struct cfg80211_qos_map *qos_map)
 762 {
 763         unsigned int dscp;
 764         unsigned char vlan_priority;
 765         unsigned int ret;
 766
 767         /* skb->priority values from 256->263 are magic values to
 768          * directly indicate a specific 802.1d priority.  This is used
 769          * to allow 802.1d priority to be passed directly in from VLAN
 770          * tags, etc.
 771          */
 772         if (skb->priority >= 256 && skb->priority <= 263) {
 773                 ret = skb->priority - 256;
 774                 goto out;
 775         }
 776
 777         if (skb_vlan_tag_present(skb)) {
 778                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 779                         >> VLAN_PRIO_SHIFT;
 780                 if (vlan_priority > 0) {
 781                         ret = vlan_priority;
 782                         goto out;
 783                 }
 784         }
 785
 786         switch (skb->protocol) {
 787         case htons(ETH_P_IP):
 788                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 789                 break;
 790         case htons(ETH_P_IPV6):
 791                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 792                 break;
 793         case htons(ETH_P_MPLS_UC):
 794         case htons(ETH_P_MPLS_MC): {
 795                 struct mpls_label mpls_tmp, *mpls;
 796
 797                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 798                                           sizeof(*mpls), &mpls_tmp);
 799                 if (!mpls)
 800                         return 0;
 801
 802                 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 803                         >> MPLS_LS_TC_SHIFT;
 804                 goto out;
 805         }
 806         case htons(ETH_P_80221):
 807                 /* 802.21 is always network control traffic */
 808                 return 7;
 809         default:
 810                 return 0;
 811         }
 812
 813         if (qos_map) {
 814                 unsigned int i, tmp_dscp = dscp >> 2;
 815
 816                 for (i = 0; i < qos_map->num_des; i++) {
 817                         if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
 818                                 ret = qos_map->dscp_exception[i].up;
 819                                 goto out;
 820                         }
 821                 }
 822
 823                 for (i = 0; i < 8; i++) {
 824                         if (tmp_dscp >= qos_map->up[i].low &&
 825                             tmp_dscp <= qos_map->up[i].high) {
 826                                 ret = i;
 827                                 goto out;
 828                         }
 829                 }
 830         }
 831
 832         ret = dscp >> 5;
 833 out:
 834         return array_index_nospec(ret, IEEE80211_NUM_TIDS);
 835 }
 836 EXPORT_SYMBOL(cfg80211_classify8021d);
 837
 838 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
 839 {
 840         const struct cfg80211_bss_ies *ies;
 841
 842         ies = rcu_dereference(bss->ies);
 843         if (!ies)
 844                 return NULL;
 845
 846         return cfg80211_find_elem(id, ies->data, ies->len);
 847 }
 848 EXPORT_SYMBOL(ieee80211_bss_get_elem);
 849
 850 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 851 {
 852         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 853         struct net_device *dev = wdev->netdev;
 854         int i;
 855
 856         if (!wdev->connect_keys)
 857                 return;
 858
 859         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 860                 if (!wdev->connect_keys->params[i].cipher)
 861                         continue;
 862                 if (rdev_add_key(rdev, dev, i, false, NULL,
 863                                  &wdev->connect_keys->params[i])) {
 864                         netdev_err(dev, "failed to set key %d\n", i);
 865                         continue;
 866                 }
 867                 if (wdev->connect_keys->def == i &&
 868                     rdev_set_default_key(rdev, dev, i, true, true)) {
 869                         netdev_err(dev, "failed to set defkey %d\n", i);
 870                         continue;
 871                 }
 872         }
 873
 874         kfree_sensitive(wdev->connect_keys);
 875         wdev->connect_keys = NULL;
 876 }
 877
 878 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 879 {
 880         struct cfg80211_event *ev;
 881         unsigned long flags;
 882
 883         spin_lock_irqsave(&wdev->event_lock, flags);
 884         while (!list_empty(&wdev->event_list)) {
 885                 ev = list_first_entry(&wdev->event_list,
 886                                       struct cfg80211_event, list);
 887                 list_del(&ev->list);
 888                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 889
 890                 wdev_lock(wdev);
 891                 switch (ev->type) {
 892                 case EVENT_CONNECT_RESULT:
 893                         __cfg80211_connect_result(
 894                                 wdev->netdev,
 895                                 &ev->cr,
 896                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 897                         break;
 898                 case EVENT_ROAMED:
 899                         __cfg80211_roamed(wdev, &ev->rm);
 900                         break;
 901                 case EVENT_DISCONNECTED:
 902                         __cfg80211_disconnected(wdev->netdev,
 903                                                 ev->dc.ie, ev->dc.ie_len,
 904                                                 ev->dc.reason,
 905                                                 !ev->dc.locally_generated);
 906                         break;
 907                 case EVENT_IBSS_JOINED:
 908                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 909                                                ev->ij.channel);
 910                         break;
 911                 case EVENT_STOPPED:
 912                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 913                         break;
 914                 case EVENT_PORT_AUTHORIZED:
 915                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 916                         break;
 917                 }
 918                 wdev_unlock(wdev);
 919
 920                 kfree(ev);
 921
 922                 spin_lock_irqsave(&wdev->event_lock, flags);
 923         }
 924         spin_unlock_irqrestore(&wdev->event_lock, flags);
 925 }
 926
 927 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 928 {
 929         struct wireless_dev *wdev;
 930
 931         ASSERT_RTNL();
 932
 933         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 934                 cfg80211_process_wdev_events(wdev);
 935 }
 936
 937 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 938                           struct net_device *dev, enum nl80211_iftype ntype,
 939                           struct vif_params *params)
 940 {
 941         int err;
 942         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 943
 944         ASSERT_RTNL();
 945
 946         /* don't support changing VLANs, you just re-create them */
 947         if (otype == NL80211_IFTYPE_AP_VLAN)
 948                 return -EOPNOTSUPP;
 949
 950         /* cannot change into P2P device or NAN */
 951         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 952             ntype == NL80211_IFTYPE_NAN)
 953                 return -EOPNOTSUPP;
 954
 955         if (!rdev->ops->change_virtual_intf ||
 956             !(rdev->wiphy.interface_modes & (1 << ntype)))
 957                 return -EOPNOTSUPP;
 958
 959         /* if it's part of a bridge, reject changing type to station/ibss */
 960         if (netif_is_bridge_port(dev) &&
 961             (ntype == NL80211_IFTYPE_ADHOC ||
 962              ntype == NL80211_IFTYPE_STATION ||
 963              ntype == NL80211_IFTYPE_P2P_CLIENT))
 964                 return -EBUSY;
 965
 966         if (ntype != otype) {
 967                 dev->ieee80211_ptr->use_4addr = false;
 968                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 969                 wdev_lock(dev->ieee80211_ptr);
 970                 rdev_set_qos_map(rdev, dev, NULL);
 971                 wdev_unlock(dev->ieee80211_ptr);
 972
 973                 switch (otype) {
 974                 case NL80211_IFTYPE_AP:
 975                         cfg80211_stop_ap(rdev, dev, true);
 976                         break;
 977                 case NL80211_IFTYPE_ADHOC:
 978                         cfg80211_leave_ibss(rdev, dev, false);
 979                         break;
 980                 case NL80211_IFTYPE_STATION:
 981                 case NL80211_IFTYPE_P2P_CLIENT:
 982                         wdev_lock(dev->ieee80211_ptr);
 983                         cfg80211_disconnect(rdev, dev,
 984                                             WLAN_REASON_DEAUTH_LEAVING, true);
 985                         wdev_unlock(dev->ieee80211_ptr);
 986                         break;
 987                 case NL80211_IFTYPE_MESH_POINT:
 988                         /* mesh should be handled? */
 989                         break;
 990                 default:
 991                         break;
 992                 }
 993
 994                 cfg80211_process_rdev_events(rdev);
 995                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
 996         }
 997
 998         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 999
1000         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1001
1002         if (!err && params && params->use_4addr != -1)
1003                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1004
1005         if (!err) {
1006                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1007                 switch (ntype) {
1008                 case NL80211_IFTYPE_STATION:
1009                         if (dev->ieee80211_ptr->use_4addr)
1010                                 break;
1011                         fallthrough;
1012                 case NL80211_IFTYPE_OCB:
1013                 case NL80211_IFTYPE_P2P_CLIENT:
1014                 case NL80211_IFTYPE_ADHOC:
1015                         dev->priv_flags |= IFF_DONT_BRIDGE;
1016                         break;
1017                 case NL80211_IFTYPE_P2P_GO:
1018                 case NL80211_IFTYPE_AP:
1019                 case NL80211_IFTYPE_AP_VLAN:
1020                 case NL80211_IFTYPE_WDS:
1021                 case NL80211_IFTYPE_MESH_POINT:
1022                         /* bridging OK */
1023                         break;
1024                 case NL80211_IFTYPE_MONITOR:
1025                         /* monitor can't bridge anyway */
1026                         break;
1027                 case NL80211_IFTYPE_UNSPECIFIED:
1028                 case NUM_NL80211_IFTYPES:
1029                         /* not happening */
1030                         break;
1031                 case NL80211_IFTYPE_P2P_DEVICE:
1032                 case NL80211_IFTYPE_NAN:
1033                         WARN_ON(1);
1034                         break;
1035                 }
1036         }
1037
1038         if (!err && ntype != otype && netif_running(dev)) {
1039                 cfg80211_update_iface_num(rdev, ntype, 1);
1040                 cfg80211_update_iface_num(rdev, otype, -1);
1041         }
1042
1043         return err;
1044 }
1045
1046 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1047 {
1048         int modulation, streams, bitrate;
1049
1050         /* the formula below does only work for MCS values smaller than 32 */
1051         if (WARN_ON_ONCE(rate->mcs >= 32))
1052                 return 0;
1053
1054         modulation = rate->mcs & 7;
1055         streams = (rate->mcs >> 3) + 1;
1056
1057         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1058
1059         if (modulation < 4)
1060                 bitrate *= (modulation + 1);
1061         else if (modulation == 4)
1062                 bitrate *= (modulation + 2);
1063         else
1064                 bitrate *= (modulation + 3);
1065
1066         bitrate *= streams;
1067
1068         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1069                 bitrate = (bitrate / 9) * 10;
1070
1071         /* do NOT round down here */
1072         return (bitrate + 50000) / 100000;
1073 }
1074
1075 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1076 {
1077         static const u32 __mcs2bitrate[] = {
1078                 /* control PHY */
1079                 [0] =   275,
1080                 /* SC PHY */
1081                 [1] =  3850,
1082                 [2] =  7700,
1083                 [3] =  9625,
1084                 [4] = 11550,
1085                 [5] = 12512, /* 1251.25 mbps */
1086                 [6] = 15400,
1087                 [7] = 19250,
1088                 [8] = 23100,
1089                 [9] = 25025,
1090                 [10] = 30800,
1091                 [11] = 38500,
1092                 [12] = 46200,
1093                 /* OFDM PHY */
1094                 [13] =  6930,
1095                 [14] =  8662, /* 866.25 mbps */
1096                 [15] = 13860,
1097                 [16] = 17325,
1098                 [17] = 20790,
1099                 [18] = 27720,
1100                 [19] = 34650,
1101                 [20] = 41580,
1102                 [21] = 45045,
1103                 [22] = 51975,
1104                 [23] = 62370,
1105                 [24] = 67568, /* 6756.75 mbps */
1106                 /* LP-SC PHY */
1107                 [25] =  6260,
1108                 [26] =  8340,
1109                 [27] = 11120,
1110                 [28] = 12510,
1111                 [29] = 16680,
1112                 [30] = 22240,
1113                 [31] = 25030,
1114         };
1115
1116         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1117                 return 0;
1118
1119         return __mcs2bitrate[rate->mcs];
1120 }
1121
1122 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1123 {
1124         static const u32 __mcs2bitrate[] = {
1125                 /* control PHY */
1126                 [0] =   275,
1127                 /* SC PHY */
1128                 [1] =  3850,
1129                 [2] =  7700,
1130                 [3] =  9625,
1131                 [4] = 11550,
1132                 [5] = 12512, /* 1251.25 mbps */
1133                 [6] = 13475,
1134                 [7] = 15400,
1135                 [8] = 19250,
1136                 [9] = 23100,
1137                 [10] = 25025,
1138                 [11] = 26950,
1139                 [12] = 30800,
1140                 [13] = 38500,
1141                 [14] = 46200,
1142                 [15] = 50050,
1143                 [16] = 53900,
1144                 [17] = 57750,
1145                 [18] = 69300,
1146                 [19] = 75075,
1147                 [20] = 80850,
1148         };
1149
1150         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1151                 return 0;
1152
1153         return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1154 }
1155
1156 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1157 {
1158         static const u32 base[4][10] = {
1159                 {   6500000,
1160                    13000000,
1161                    19500000,
1162                    26000000,
1163                    39000000,
1164                    52000000,
1165                    58500000,
1166                    65000000,
1167                    78000000,
1168                 /* not in the spec, but some devices use this: */
1169                    86500000,
1170                 },
1171                 {  13500000,
1172                    27000000,
1173                    40500000,
1174                    54000000,
1175                    81000000,
1176                   108000000,
1177                   121500000,
1178                   135000000,
1179                   162000000,
1180                   180000000,
1181                 },
1182                 {  29300000,
1183                    58500000,
1184                    87800000,
1185                   117000000,
1186                   175500000,
1187                   234000000,
1188                   263300000,
1189                   292500000,
1190                   351000000,
1191                   390000000,
1192                 },
1193                 {  58500000,
1194                   117000000,
1195                   175500000,
1196                   234000000,
1197                   351000000,
1198                   468000000,
1199                   526500000,
1200                   585000000,
1201                   702000000,
1202                   780000000,
1203                 },
1204         };
1205         u32 bitrate;
1206         int idx;
1207
1208         if (rate->mcs > 9)
1209                 goto warn;
1210
1211         switch (rate->bw) {
1212         case RATE_INFO_BW_160:
1213                 idx = 3;
1214                 break;
1215         case RATE_INFO_BW_80:
1216                 idx = 2;
1217                 break;
1218         case RATE_INFO_BW_40:
1219                 idx = 1;
1220                 break;
1221         case RATE_INFO_BW_5:
1222         case RATE_INFO_BW_10:
1223         default:
1224                 goto warn;
1225         case RATE_INFO_BW_20:
1226                 idx = 0;
1227         }
1228
1229         bitrate = base[idx][rate->mcs];
1230         bitrate *= rate->nss;
1231
1232         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1233                 bitrate = (bitrate / 9) * 10;
1234
1235         /* do NOT round down here */
1236         return (bitrate + 50000) / 100000;
1237  warn:
1238         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1239                   rate->bw, rate->mcs, rate->nss);
1240         return 0;
1241 }
1242
1243 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1244 {
1245 #define SCALE 2048
1246         u16 mcs_divisors[12] = {
1247                 34133, /* 16.666666... */
1248                 17067, /*  8.333333... */
1249                 11378, /*  5.555555... */
1250                  8533, /*  4.166666... */
1251                  5689, /*  2.777777... */
1252                  4267, /*  2.083333... */
1253                  3923, /*  1.851851... */
1254                  3413, /*  1.666666... */
1255                  2844, /*  1.388888... */
1256                  2560, /*  1.250000... */
1257                  2276, /*  1.111111... */
1258                  2048, /*  1.000000... */
1259         };
1260         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1261         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1262         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1263         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1264         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1265         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1266         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1267         u64 tmp;
1268         u32 result;
1269
1270         if (WARN_ON_ONCE(rate->mcs > 11))
1271                 return 0;
1272
1273         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1274                 return 0;
1275         if (WARN_ON_ONCE(rate->he_ru_alloc >
1276                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1277                 return 0;
1278         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1279                 return 0;
1280
1281         if (rate->bw == RATE_INFO_BW_160)
1282                 result = rates_160M[rate->he_gi];
1283         else if (rate->bw == RATE_INFO_BW_80 ||
1284                  (rate->bw == RATE_INFO_BW_HE_RU &&
1285                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1286                 result = rates_969[rate->he_gi];
1287         else if (rate->bw == RATE_INFO_BW_40 ||
1288                  (rate->bw == RATE_INFO_BW_HE_RU &&
1289                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1290                 result = rates_484[rate->he_gi];
1291         else if (rate->bw == RATE_INFO_BW_20 ||
1292                  (rate->bw == RATE_INFO_BW_HE_RU &&
1293                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1294                 result = rates_242[rate->he_gi];
1295         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1296                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1297                 result = rates_106[rate->he_gi];
1298         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1299                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1300                 result = rates_52[rate->he_gi];
1301         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1302                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1303                 result = rates_26[rate->he_gi];
1304         else {
1305                 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1306                      rate->bw, rate->he_ru_alloc);
1307                 return 0;
1308         }
1309
1310         /* now scale to the appropriate MCS */
1311         tmp = result;
1312         tmp *= SCALE;
1313         do_div(tmp, mcs_divisors[rate->mcs]);
1314         result = tmp;
1315
1316         /* and take NSS, DCM into account */
1317         result = (result * rate->nss) / 8;
1318         if (rate->he_dcm)
1319                 result /= 2;
1320
1321         return result / 10000;
1322 }
1323
1324 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1325 {
1326         if (rate->flags & RATE_INFO_FLAGS_MCS)
1327                 return cfg80211_calculate_bitrate_ht(rate);
1328         if (rate->flags & RATE_INFO_FLAGS_DMG)
1329                 return cfg80211_calculate_bitrate_dmg(rate);
1330         if (rate->flags & RATE_INFO_FLAGS_EDMG)
1331                 return cfg80211_calculate_bitrate_edmg(rate);
1332         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1333                 return cfg80211_calculate_bitrate_vht(rate);
1334         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1335                 return cfg80211_calculate_bitrate_he(rate);
1336
1337         return rate->legacy;
1338 }
1339 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1340
1341 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1342                           enum ieee80211_p2p_attr_id attr,
1343                           u8 *buf, unsigned int bufsize)
1344 {
1345         u8 *out = buf;
1346         u16 attr_remaining = 0;
1347         bool desired_attr = false;
1348         u16 desired_len = 0;
1349
1350         while (len > 0) {
1351                 unsigned int iedatalen;
1352                 unsigned int copy;
1353                 const u8 *iedata;
1354
1355                 if (len < 2)
1356                         return -EILSEQ;
1357                 iedatalen = ies[1];
1358                 if (iedatalen + 2 > len)
1359                         return -EILSEQ;
1360
1361                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1362                         goto cont;
1363
1364                 if (iedatalen < 4)
1365                         goto cont;
1366
1367                 iedata = ies + 2;
1368
1369                 /* check WFA OUI, P2P subtype */
1370                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1371                     iedata[2] != 0x9a || iedata[3] != 0x09)
1372                         goto cont;
1373
1374                 iedatalen -= 4;
1375                 iedata += 4;
1376
1377                 /* check attribute continuation into this IE */
1378                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1379                 if (copy && desired_attr) {
1380                         desired_len += copy;
1381                         if (out) {
1382                                 memcpy(out, iedata, min(bufsize, copy));
1383                                 out += min(bufsize, copy);
1384                                 bufsize -= min(bufsize, copy);
1385                         }
1386
1387
1388                         if (copy == attr_remaining)
1389                                 return desired_len;
1390                 }
1391
1392                 attr_remaining -= copy;
1393                 if (attr_remaining)
1394                         goto cont;
1395
1396                 iedatalen -= copy;
1397                 iedata += copy;
1398
1399                 while (iedatalen > 0) {
1400                         u16 attr_len;
1401
1402                         /* P2P attribute ID & size must fit */
1403                         if (iedatalen < 3)
1404                                 return -EILSEQ;
1405                         desired_attr = iedata[0] == attr;
1406                         attr_len = get_unaligned_le16(iedata + 1);
1407                         iedatalen -= 3;
1408                         iedata += 3;
1409
1410                         copy = min_t(unsigned int, attr_len, iedatalen);
1411
1412                         if (desired_attr) {
1413                                 desired_len += copy;
1414                                 if (out) {
1415                                         memcpy(out, iedata, min(bufsize, copy));
1416                                         out += min(bufsize, copy);
1417                                         bufsize -= min(bufsize, copy);
1418                                 }
1419
1420                                 if (copy == attr_len)
1421                                         return desired_len;
1422                         }
1423
1424                         iedata += copy;
1425                         iedatalen -= copy;
1426                         attr_remaining = attr_len - copy;
1427                 }
1428
1429  cont:
1430                 len -= ies[1] + 2;
1431                 ies += ies[1] + 2;
1432         }
1433
1434         if (attr_remaining && desired_attr)
1435                 return -EILSEQ;
1436
1437         return -ENOENT;
1438 }
1439 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1440
1441 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1442 {
1443         int i;
1444
1445         /* Make sure array values are legal */
1446         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1447                 return false;
1448
1449         i = 0;
1450         while (i < n_ids) {
1451                 if (ids[i] == WLAN_EID_EXTENSION) {
1452                         if (id_ext && (ids[i + 1] == id))
1453                                 return true;
1454
1455                         i += 2;
1456                         continue;
1457                 }
1458
1459                 if (ids[i] == id && !id_ext)
1460                         return true;
1461
1462                 i++;
1463         }
1464         return false;
1465 }
1466
1467 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1468 {
1469         /* we assume a validly formed IEs buffer */
1470         u8 len = ies[pos + 1];
1471
1472         pos += 2 + len;
1473
1474         /* the IE itself must have 255 bytes for fragments to follow */
1475         if (len < 255)
1476                 return pos;
1477
1478         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1479                 len = ies[pos + 1];
1480                 pos += 2 + len;
1481         }
1482
1483         return pos;
1484 }
1485
1486 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1487                               const u8 *ids, int n_ids,
1488                               const u8 *after_ric, int n_after_ric,
1489                               size_t offset)
1490 {
1491         size_t pos = offset;
1492
1493         while (pos < ielen) {
1494                 u8 ext = 0;
1495
1496                 if (ies[pos] == WLAN_EID_EXTENSION)
1497                         ext = 2;
1498                 if ((pos + ext) >= ielen)
1499                         break;
1500
1501                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1502                                           ies[pos] == WLAN_EID_EXTENSION))
1503                         break;
1504
1505                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1506                         pos = skip_ie(ies, ielen, pos);
1507
1508                         while (pos < ielen) {
1509                                 if (ies[pos] == WLAN_EID_EXTENSION)
1510                                         ext = 2;
1511                                 else
1512                                         ext = 0;
1513
1514                                 if ((pos + ext) >= ielen)
1515                                         break;
1516
1517                                 if (!ieee80211_id_in_list(after_ric,
1518                                                           n_after_ric,
1519                                                           ies[pos + ext],
1520                                                           ext == 2))
1521                                         pos = skip_ie(ies, ielen, pos);
1522                                 else
1523                                         break;
1524                         }
1525                 } else {
1526                         pos = skip_ie(ies, ielen, pos);
1527                 }
1528         }
1529
1530         return pos;
1531 }
1532 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1533
1534 bool ieee80211_operating_class_to_band(u8 operating_class,
1535                                        enum nl80211_band *band)
1536 {
1537         switch (operating_class) {
1538         case 112:
1539         case 115 ... 127:
1540         case 128 ... 130:
1541                 *band = NL80211_BAND_5GHZ;
1542                 return true;
1543         case 131 ... 135:
1544                 *band = NL80211_BAND_6GHZ;
1545                 return true;
1546         case 81:
1547         case 82:
1548         case 83:
1549         case 84:
1550                 *band = NL80211_BAND_2GHZ;
1551                 return true;
1552         case 180:
1553                 *band = NL80211_BAND_60GHZ;
1554                 return true;
1555         }
1556
1557         return false;
1558 }
1559 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1560
1561 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1562                                           u8 *op_class)
1563 {
1564         u8 vht_opclass;
1565         u32 freq = chandef->center_freq1;
1566
1567         if (freq >= 2412 && freq <= 2472) {
1568                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1569                         return false;
1570
1571                 /* 2.407 GHz, channels 1..13 */
1572                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1573                         if (freq > chandef->chan->center_freq)
1574                                 *op_class = 83; /* HT40+ */
1575                         else
1576                                 *op_class = 84; /* HT40- */
1577                 } else {
1578                         *op_class = 81;
1579                 }
1580
1581                 return true;
1582         }
1583
1584         if (freq == 2484) {
1585                 /* channel 14 is only for IEEE 802.11b */
1586                 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1587                         return false;
1588
1589                 *op_class = 82; /* channel 14 */
1590                 return true;
1591         }
1592
1593         switch (chandef->width) {
1594         case NL80211_CHAN_WIDTH_80:
1595                 vht_opclass = 128;
1596                 break;
1597         case NL80211_CHAN_WIDTH_160:
1598                 vht_opclass = 129;
1599                 break;
1600         case NL80211_CHAN_WIDTH_80P80:
1601                 vht_opclass = 130;
1602                 break;
1603         case NL80211_CHAN_WIDTH_10:
1604         case NL80211_CHAN_WIDTH_5:
1605                 return false; /* unsupported for now */
1606         default:
1607                 vht_opclass = 0;
1608                 break;
1609         }
1610
1611         /* 5 GHz, channels 36..48 */
1612         if (freq >= 5180 && freq <= 5240) {
1613                 if (vht_opclass) {
1614                         *op_class = vht_opclass;
1615                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1616                         if (freq > chandef->chan->center_freq)
1617                                 *op_class = 116;
1618                         else
1619                                 *op_class = 117;
1620                 } else {
1621                         *op_class = 115;
1622                 }
1623
1624                 return true;
1625         }
1626
1627         /* 5 GHz, channels 52..64 */
1628         if (freq >= 5260 && freq <= 5320) {
1629                 if (vht_opclass) {
1630                         *op_class = vht_opclass;
1631                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1632                         if (freq > chandef->chan->center_freq)
1633                                 *op_class = 119;
1634                         else
1635                                 *op_class = 120;
1636                 } else {
1637                         *op_class = 118;
1638                 }
1639
1640                 return true;
1641         }
1642
1643         /* 5 GHz, channels 100..144 */
1644         if (freq >= 5500 && freq <= 5720) {
1645                 if (vht_opclass) {
1646                         *op_class = vht_opclass;
1647                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1648                         if (freq > chandef->chan->center_freq)
1649                                 *op_class = 122;
1650                         else
1651                                 *op_class = 123;
1652                 } else {
1653                         *op_class = 121;
1654                 }
1655
1656                 return true;
1657         }
1658
1659         /* 5 GHz, channels 149..169 */
1660         if (freq >= 5745 && freq <= 5845) {
1661                 if (vht_opclass) {
1662                         *op_class = vht_opclass;
1663                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1664                         if (freq > chandef->chan->center_freq)
1665                                 *op_class = 126;
1666                         else
1667                                 *op_class = 127;
1668                 } else if (freq <= 5805) {
1669                         *op_class = 124;
1670                 } else {
1671                         *op_class = 125;
1672                 }
1673
1674                 return true;
1675         }
1676
1677         /* 56.16 GHz, channel 1..4 */
1678         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1679                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1680                         return false;
1681
1682                 *op_class = 180;
1683                 return true;
1684         }
1685
1686         /* not supported yet */
1687         return false;
1688 }
1689 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1690
1691 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1692                                        u32 *beacon_int_gcd,
1693                                        bool *beacon_int_different)
1694 {
1695         struct wireless_dev *wdev;
1696
1697         *beacon_int_gcd = 0;
1698         *beacon_int_different = false;
1699
1700         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1701                 if (!wdev->beacon_interval)
1702                         continue;
1703
1704                 if (!*beacon_int_gcd) {
1705                         *beacon_int_gcd = wdev->beacon_interval;
1706                         continue;
1707                 }
1708
1709                 if (wdev->beacon_interval == *beacon_int_gcd)
1710                         continue;
1711
1712                 *beacon_int_different = true;
1713                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1714         }
1715
1716         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1717                 if (*beacon_int_gcd)
1718                         *beacon_int_different = true;
1719                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1720         }
1721 }
1722
1723 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1724                                  enum nl80211_iftype iftype, u32 beacon_int)
1725 {
1726         /*
1727          * This is just a basic pre-condition check; if interface combinations
1728          * are possible the driver must already be checking those with a call
1729          * to cfg80211_check_combinations(), in which case we'll validate more
1730          * through the cfg80211_calculate_bi_data() call and code in
1731          * cfg80211_iter_combinations().
1732          */
1733
1734         if (beacon_int < 10 || beacon_int > 10000)
1735                 return -EINVAL;
1736
1737         return 0;
1738 }
1739
1740 int cfg80211_iter_combinations(struct wiphy *wiphy,
1741                                struct iface_combination_params *params,
1742                                void (*iter)(const struct ieee80211_iface_combination *c,
1743                                             void *data),
1744                                void *data)
1745 {
1746         const struct ieee80211_regdomain *regdom;
1747         enum nl80211_dfs_regions region = 0;
1748         int i, j, iftype;
1749         int num_interfaces = 0;
1750         u32 used_iftypes = 0;
1751         u32 beacon_int_gcd;
1752         bool beacon_int_different;
1753
1754         /*
1755          * This is a bit strange, since the iteration used to rely only on
1756          * the data given by the driver, but here it now relies on context,
1757          * in form of the currently operating interfaces.
1758          * This is OK for all current users, and saves us from having to
1759          * push the GCD calculations into all the drivers.
1760          * In the future, this should probably rely more on data that's in
1761          * cfg80211 already - the only thing not would appear to be any new
1762          * interfaces (while being brought up) and channel/radar data.
1763          */
1764         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1765                                    &beacon_int_gcd, &beacon_int_different);
1766
1767         if (params->radar_detect) {
1768                 rcu_read_lock();
1769                 regdom = rcu_dereference(cfg80211_regdomain);
1770                 if (regdom)
1771                         region = regdom->dfs_region;
1772                 rcu_read_unlock();
1773         }
1774
1775         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1776                 num_interfaces += params->iftype_num[iftype];
1777                 if (params->iftype_num[iftype] > 0 &&
1778                     !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1779                         used_iftypes |= BIT(iftype);
1780         }
1781
1782         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1783                 const struct ieee80211_iface_combination *c;
1784                 struct ieee80211_iface_limit *limits;
1785                 u32 all_iftypes = 0;
1786
1787                 c = &wiphy->iface_combinations[i];
1788
1789                 if (num_interfaces > c->max_interfaces)
1790                         continue;
1791                 if (params->num_different_channels > c->num_different_channels)
1792                         continue;
1793
1794                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1795                                  GFP_KERNEL);
1796                 if (!limits)
1797                         return -ENOMEM;
1798
1799                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1800                         if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1801                                 continue;
1802                         for (j = 0; j < c->n_limits; j++) {
1803                                 all_iftypes |= limits[j].types;
1804                                 if (!(limits[j].types & BIT(iftype)))
1805                                         continue;
1806                                 if (limits[j].max < params->iftype_num[iftype])
1807                                         goto cont;
1808                                 limits[j].max -= params->iftype_num[iftype];
1809                         }
1810                 }
1811
1812                 if (params->radar_detect !=
1813                         (c->radar_detect_widths & params->radar_detect))
1814                         goto cont;
1815
1816                 if (params->radar_detect && c->radar_detect_regions &&
1817                     !(c->radar_detect_regions & BIT(region)))
1818                         goto cont;
1819
1820                 /* Finally check that all iftypes that we're currently
1821                  * using are actually part of this combination. If they
1822                  * aren't then we can't use this combination and have
1823                  * to continue to the next.
1824                  */
1825                 if ((all_iftypes & used_iftypes) != used_iftypes)
1826                         goto cont;
1827
1828                 if (beacon_int_gcd) {
1829                         if (c->beacon_int_min_gcd &&
1830                             beacon_int_gcd < c->beacon_int_min_gcd)
1831                                 goto cont;
1832                         if (!c->beacon_int_min_gcd && beacon_int_different)
1833                                 goto cont;
1834                 }
1835
1836                 /* This combination covered all interface types and
1837                  * supported the requested numbers, so we're good.
1838                  */
1839
1840                 (*iter)(c, data);
1841  cont:
1842                 kfree(limits);
1843         }
1844
1845         return 0;
1846 }
1847 EXPORT_SYMBOL(cfg80211_iter_combinations);
1848
1849 static void
1850 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1851                           void *data)
1852 {
1853         int *num = data;
1854         (*num)++;
1855 }
1856
1857 int cfg80211_check_combinations(struct wiphy *wiphy,
1858                                 struct iface_combination_params *params)
1859 {
1860         int err, num = 0;
1861
1862         err = cfg80211_iter_combinations(wiphy, params,
1863                                          cfg80211_iter_sum_ifcombs, &num);
1864         if (err)
1865                 return err;
1866         if (num == 0)
1867                 return -EBUSY;
1868
1869         return 0;
1870 }
1871 EXPORT_SYMBOL(cfg80211_check_combinations);
1872
1873 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1874                            const u8 *rates, unsigned int n_rates,
1875                            u32 *mask)
1876 {
1877         int i, j;
1878
1879         if (!sband)
1880                 return -EINVAL;
1881
1882         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1883                 return -EINVAL;
1884
1885         *mask = 0;
1886
1887         for (i = 0; i < n_rates; i++) {
1888                 int rate = (rates[i] & 0x7f) * 5;
1889                 bool found = false;
1890
1891                 for (j = 0; j < sband->n_bitrates; j++) {
1892                         if (sband->bitrates[j].bitrate == rate) {
1893                                 found = true;
1894                                 *mask |= BIT(j);
1895                                 break;
1896                         }
1897                 }
1898                 if (!found)
1899                         return -EINVAL;
1900         }
1901
1902         /*
1903          * mask must have at least one bit set here since we
1904          * didn't accept a 0-length rates array nor allowed
1905          * entries in the array that didn't exist
1906          */
1907
1908         return 0;
1909 }
1910
1911 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1912 {
1913         enum nl80211_band band;
1914         unsigned int n_channels = 0;
1915
1916         for (band = 0; band < NUM_NL80211_BANDS; band++)
1917                 if (wiphy->bands[band])
1918                         n_channels += wiphy->bands[band]->n_channels;
1919
1920         return n_channels;
1921 }
1922 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1923
1924 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1925                          struct station_info *sinfo)
1926 {
1927         struct cfg80211_registered_device *rdev;
1928         struct wireless_dev *wdev;
1929
1930         wdev = dev->ieee80211_ptr;
1931         if (!wdev)
1932                 return -EOPNOTSUPP;
1933
1934         rdev = wiphy_to_rdev(wdev->wiphy);
1935         if (!rdev->ops->get_station)
1936                 return -EOPNOTSUPP;
1937
1938         memset(sinfo, 0, sizeof(*sinfo));
1939
1940         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1941 }
1942 EXPORT_SYMBOL(cfg80211_get_station);
1943
1944 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1945 {
1946         int i;
1947
1948         if (!f)
1949                 return;
1950
1951         kfree(f->serv_spec_info);
1952         kfree(f->srf_bf);
1953         kfree(f->srf_macs);
1954         for (i = 0; i < f->num_rx_filters; i++)
1955                 kfree(f->rx_filters[i].filter);
1956
1957         for (i = 0; i < f->num_tx_filters; i++)
1958                 kfree(f->tx_filters[i].filter);
1959
1960         kfree(f->rx_filters);
1961         kfree(f->tx_filters);
1962         kfree(f);
1963 }
1964 EXPORT_SYMBOL(cfg80211_free_nan_func);
1965
1966 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1967                                 u32 center_freq_khz, u32 bw_khz)
1968 {
1969         u32 start_freq_khz, end_freq_khz;
1970
1971         start_freq_khz = center_freq_khz - (bw_khz / 2);
1972         end_freq_khz = center_freq_khz + (bw_khz / 2);
1973
1974         if (start_freq_khz >= freq_range->start_freq_khz &&
1975             end_freq_khz <= freq_range->end_freq_khz)
1976                 return true;
1977
1978         return false;
1979 }
1980
1981 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1982 {
1983         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1984                                 sizeof(*(sinfo->pertid)),
1985                                 gfp);
1986         if (!sinfo->pertid)
1987                 return -ENOMEM;
1988
1989         return 0;
1990 }
1991 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1992
1993 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1994 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1995 const unsigned char rfc1042_header[] __aligned(2) =
1996         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1997 EXPORT_SYMBOL(rfc1042_header);
1998
1999 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2000 const unsigned char bridge_tunnel_header[] __aligned(2) =
2001         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2002 EXPORT_SYMBOL(bridge_tunnel_header);
2003
2004 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2005 struct iapp_layer2_update {
2006         u8 da[ETH_ALEN];        /* broadcast */
2007         u8 sa[ETH_ALEN];        /* STA addr */
2008         __be16 len;             /* 6 */
2009         u8 dsap;                /* 0 */
2010         u8 ssap;                /* 0 */
2011         u8 control;
2012         u8 xid_info[3];
2013 } __packed;
2014
2015 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2016 {
2017         struct iapp_layer2_update *msg;
2018         struct sk_buff *skb;
2019
2020         /* Send Level 2 Update Frame to update forwarding tables in layer 2
2021          * bridge devices */
2022
2023         skb = dev_alloc_skb(sizeof(*msg));
2024         if (!skb)
2025                 return;
2026         msg = skb_put(skb, sizeof(*msg));
2027
2028         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2029          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2030
2031         eth_broadcast_addr(msg->da);
2032         ether_addr_copy(msg->sa, addr);
2033         msg->len = htons(6);
2034         msg->dsap = 0;
2035         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
2036         msg->control = 0xaf;    /* XID response lsb.1111F101.
2037                                  * F=0 (no poll command; unsolicited frame) */
2038         msg->xid_info[0] = 0x81;        /* XID format identifier */
2039         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
2040         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
2041
2042         skb->dev = dev;
2043         skb->protocol = eth_type_trans(skb, dev);
2044         memset(skb->cb, 0, sizeof(skb->cb));
2045         netif_rx_ni(skb);
2046 }
2047 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2048
2049 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2050                               enum ieee80211_vht_chanwidth bw,
2051                               int mcs, bool ext_nss_bw_capable,
2052                               unsigned int max_vht_nss)
2053 {
2054         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2055         int ext_nss_bw;
2056         int supp_width;
2057         int i, mcs_encoding;
2058
2059         if (map == 0xffff)
2060                 return 0;
2061
2062         if (WARN_ON(mcs > 9 || max_vht_nss > 8))
2063                 return 0;
2064         if (mcs <= 7)
2065                 mcs_encoding = 0;
2066         else if (mcs == 8)
2067                 mcs_encoding = 1;
2068         else
2069                 mcs_encoding = 2;
2070
2071         if (!max_vht_nss) {
2072                 /* find max_vht_nss for the given MCS */
2073                 for (i = 7; i >= 0; i--) {
2074                         int supp = (map >> (2 * i)) & 3;
2075
2076                         if (supp == 3)
2077                                 continue;
2078
2079                         if (supp >= mcs_encoding) {
2080                                 max_vht_nss = i + 1;
2081                                 break;
2082                         }
2083                 }
2084         }
2085
2086         if (!(cap->supp_mcs.tx_mcs_map &
2087                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2088                 return max_vht_nss;
2089
2090         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2091                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2092         supp_width = le32_get_bits(cap->vht_cap_info,
2093                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2094
2095         /* if not capable, treat ext_nss_bw as 0 */
2096         if (!ext_nss_bw_capable)
2097                 ext_nss_bw = 0;
2098
2099         /* This is invalid */
2100         if (supp_width == 3)
2101                 return 0;
2102
2103         /* This is an invalid combination so pretend nothing is supported */
2104         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2105                 return 0;
2106
2107         /*
2108          * Cover all the special cases according to IEEE 802.11-2016
2109          * Table 9-250. All other cases are either factor of 1 or not
2110          * valid/supported.
2111          */
2112         switch (bw) {
2113         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2114         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2115                 if ((supp_width == 1 || supp_width == 2) &&
2116                     ext_nss_bw == 3)
2117                         return 2 * max_vht_nss;
2118                 break;
2119         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2120                 if (supp_width == 0 &&
2121                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2122                         return max_vht_nss / 2;
2123                 if (supp_width == 0 &&
2124                     ext_nss_bw == 3)
2125                         return (3 * max_vht_nss) / 4;
2126                 if (supp_width == 1 &&
2127                     ext_nss_bw == 3)
2128                         return 2 * max_vht_nss;
2129                 break;
2130         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2131                 if (supp_width == 0 && ext_nss_bw == 1)
2132                         return 0; /* not possible */
2133                 if (supp_width == 0 &&
2134                     ext_nss_bw == 2)
2135                         return max_vht_nss / 2;
2136                 if (supp_width == 0 &&
2137                     ext_nss_bw == 3)
2138                         return (3 * max_vht_nss) / 4;
2139                 if (supp_width == 1 &&
2140                     ext_nss_bw == 0)
2141                         return 0; /* not possible */
2142                 if (supp_width == 1 &&
2143                     ext_nss_bw == 1)
2144                         return max_vht_nss / 2;
2145                 if (supp_width == 1 &&
2146                     ext_nss_bw == 2)
2147                         return (3 * max_vht_nss) / 4;
2148                 break;
2149         }
2150
2151         /* not covered or invalid combination received */
2152         return max_vht_nss;
2153 }
2154 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2155
2156 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2157                              bool is_4addr, u8 check_swif)
2158
2159 {
2160         bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2161
2162         switch (check_swif) {
2163         case 0:
2164                 if (is_vlan && is_4addr)
2165                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2166                 return wiphy->interface_modes & BIT(iftype);
2167         case 1:
2168                 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2169                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2170                 return wiphy->software_iftypes & BIT(iftype);
2171         default:
2172                 break;
2173         }
2174
2175         return false;
2176 }
2177 EXPORT_SYMBOL(cfg80211_iftype_allowed);