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) 2018-2019 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 int ieee80211_channel_to_frequency(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 2484;
  85                 else if (chan < 14)
  86                         return 2407 + chan * 5;
  87                 break;
  88         case NL80211_BAND_5GHZ:
  89                 if (chan >= 182 && chan <= 196)
  90                         return 4000 + chan * 5;
  91                 else
  92                         return 5000 + chan * 5;
  93                 break;
  94         case NL80211_BAND_6GHZ:
  95                 /* see 802.11ax D4.1 27.3.22.2 */
  96                 if (chan <= 253)
  97                         return 5940 + chan * 5;
  98                 break;
  99         case NL80211_BAND_60GHZ:
 100                 if (chan < 7)
 101                         return 56160 + chan * 2160;
 102                 break;
 103         default:
 104                 ;
 105         }
 106         return 0; /* not supported */
 107 }
 108 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 109
 110 int ieee80211_frequency_to_channel(int freq)
 111 {
 112         /* see 802.11 17.3.8.3.2 and Annex J */
 113         if (freq == 2484)
 114                 return 14;
 115         else if (freq < 2484)
 116                 return (freq - 2407) / 5;
 117         else if (freq >= 4910 && freq <= 4980)
 118                 return (freq - 4000) / 5;
 119         else if (freq < 5940)
 120                 return (freq - 5000) / 5;
 121         else if (freq <= 45000) /* DMG band lower limit */
 122                 /* see 802.11ax D4.1 27.3.22.2 */
 123                 return (freq - 5940) / 5;
 124         else if (freq >= 58320 && freq <= 70200)
 125                 return (freq - 56160) / 2160;
 126         else
 127                 return 0;
 128 }
 129 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 130
 131 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
 132 {
 133         enum nl80211_band band;
 134         struct ieee80211_supported_band *sband;
 135         int i;
 136
 137         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 138                 sband = wiphy->bands[band];
 139
 140                 if (!sband)
 141                         continue;
 142
 143                 for (i = 0; i < sband->n_channels; i++) {
 144                         if (sband->channels[i].center_freq == freq)
 145                                 return &sband->channels[i];
 146                 }
 147         }
 148
 149         return NULL;
 150 }
 151 EXPORT_SYMBOL(ieee80211_get_channel);
 152
 153 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 154 {
 155         int i, want;
 156
 157         switch (sband->band) {
 158         case NL80211_BAND_5GHZ:
 159         case NL80211_BAND_6GHZ:
 160                 want = 3;
 161                 for (i = 0; i < sband->n_bitrates; i++) {
 162                         if (sband->bitrates[i].bitrate == 60 ||
 163                             sband->bitrates[i].bitrate == 120 ||
 164                             sband->bitrates[i].bitrate == 240) {
 165                                 sband->bitrates[i].flags |=
 166                                         IEEE80211_RATE_MANDATORY_A;
 167                                 want--;
 168                         }
 169                 }
 170                 WARN_ON(want);
 171                 break;
 172         case NL80211_BAND_2GHZ:
 173                 want = 7;
 174                 for (i = 0; i < sband->n_bitrates; i++) {
 175                         switch (sband->bitrates[i].bitrate) {
 176                         case 10:
 177                         case 20:
 178                         case 55:
 179                         case 110:
 180                                 sband->bitrates[i].flags |=
 181                                         IEEE80211_RATE_MANDATORY_B |
 182                                         IEEE80211_RATE_MANDATORY_G;
 183                                 want--;
 184                                 break;
 185                         case 60:
 186                         case 120:
 187                         case 240:
 188                                 sband->bitrates[i].flags |=
 189                                         IEEE80211_RATE_MANDATORY_G;
 190                                 want--;
 191                                 /* fall through */
 192                         default:
 193                                 sband->bitrates[i].flags |=
 194                                         IEEE80211_RATE_ERP_G;
 195                                 break;
 196                         }
 197                 }
 198                 WARN_ON(want != 0 && want != 3);
 199                 break;
 200         case NL80211_BAND_60GHZ:
 201                 /* check for mandatory HT MCS 1..4 */
 202                 WARN_ON(!sband->ht_cap.ht_supported);
 203                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 204                 break;
 205         case NUM_NL80211_BANDS:
 206         default:
 207                 WARN_ON(1);
 208                 break;
 209         }
 210 }
 211
 212 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 213 {
 214         enum nl80211_band band;
 215
 216         for (band = 0; band < NUM_NL80211_BANDS; band++)
 217                 if (wiphy->bands[band])
 218                         set_mandatory_flags_band(wiphy->bands[band]);
 219 }
 220
 221 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 222 {
 223         int i;
 224         for (i = 0; i < wiphy->n_cipher_suites; i++)
 225                 if (cipher == wiphy->cipher_suites[i])
 226                         return true;
 227         return false;
 228 }
 229
 230 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 231                                    struct key_params *params, int key_idx,
 232                                    bool pairwise, const u8 *mac_addr)
 233 {
 234         if (key_idx < 0 || key_idx > 5)
 235                 return -EINVAL;
 236
 237         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 238                 return -EINVAL;
 239
 240         if (pairwise && !mac_addr)
 241                 return -EINVAL;
 242
 243         switch (params->cipher) {
 244         case WLAN_CIPHER_SUITE_TKIP:
 245         case WLAN_CIPHER_SUITE_CCMP:
 246         case WLAN_CIPHER_SUITE_CCMP_256:
 247         case WLAN_CIPHER_SUITE_GCMP:
 248         case WLAN_CIPHER_SUITE_GCMP_256:
 249                 /* IEEE802.11-2016 allows only 0 and - when using Extended Key
 250                  * ID - 1 as index for pairwise keys.
 251                  * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
 252                  * the driver supports Extended Key ID.
 253                  * @NL80211_KEY_SET_TX can't be set when installing and
 254                  * validating a key.
 255                  */
 256                 if (params->mode == NL80211_KEY_NO_TX) {
 257                         if (!wiphy_ext_feature_isset(&rdev->wiphy,
 258                                                      NL80211_EXT_FEATURE_EXT_KEY_ID))
 259                                 return -EINVAL;
 260                         else if (!pairwise || key_idx < 0 || key_idx > 1)
 261                                 return -EINVAL;
 262                 } else if ((pairwise && key_idx) ||
 263                            params->mode == NL80211_KEY_SET_TX) {
 264                         return -EINVAL;
 265                 }
 266                 break;
 267         case WLAN_CIPHER_SUITE_AES_CMAC:
 268         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 269         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 270         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 271                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 272                 if (pairwise)
 273                         return -EINVAL;
 274                 if (key_idx < 4)
 275                         return -EINVAL;
 276                 break;
 277         case WLAN_CIPHER_SUITE_WEP40:
 278         case WLAN_CIPHER_SUITE_WEP104:
 279                 if (key_idx > 3)
 280                         return -EINVAL;
 281         default:
 282                 break;
 283         }
 284
 285         switch (params->cipher) {
 286         case WLAN_CIPHER_SUITE_WEP40:
 287                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 288                         return -EINVAL;
 289                 break;
 290         case WLAN_CIPHER_SUITE_TKIP:
 291                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 292                         return -EINVAL;
 293                 break;
 294         case WLAN_CIPHER_SUITE_CCMP:
 295                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 296                         return -EINVAL;
 297                 break;
 298         case WLAN_CIPHER_SUITE_CCMP_256:
 299                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 300                         return -EINVAL;
 301                 break;
 302         case WLAN_CIPHER_SUITE_GCMP:
 303                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 304                         return -EINVAL;
 305                 break;
 306         case WLAN_CIPHER_SUITE_GCMP_256:
 307                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 308                         return -EINVAL;
 309                 break;
 310         case WLAN_CIPHER_SUITE_WEP104:
 311                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 312                         return -EINVAL;
 313                 break;
 314         case WLAN_CIPHER_SUITE_AES_CMAC:
 315                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 316                         return -EINVAL;
 317                 break;
 318         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 319                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 320                         return -EINVAL;
 321                 break;
 322         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 323                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 324                         return -EINVAL;
 325                 break;
 326         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 327                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 328                         return -EINVAL;
 329                 break;
 330         default:
 331                 /*
 332                  * We don't know anything about this algorithm,
 333                  * allow using it -- but the driver must check
 334                  * all parameters! We still check below whether
 335                  * or not the driver supports this algorithm,
 336                  * of course.
 337                  */
 338                 break;
 339         }
 340
 341         if (params->seq) {
 342                 switch (params->cipher) {
 343                 case WLAN_CIPHER_SUITE_WEP40:
 344                 case WLAN_CIPHER_SUITE_WEP104:
 345                         /* These ciphers do not use key sequence */
 346                         return -EINVAL;
 347                 case WLAN_CIPHER_SUITE_TKIP:
 348                 case WLAN_CIPHER_SUITE_CCMP:
 349                 case WLAN_CIPHER_SUITE_CCMP_256:
 350                 case WLAN_CIPHER_SUITE_GCMP:
 351                 case WLAN_CIPHER_SUITE_GCMP_256:
 352                 case WLAN_CIPHER_SUITE_AES_CMAC:
 353                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 354                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 355                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 356                         if (params->seq_len != 6)
 357                                 return -EINVAL;
 358                         break;
 359                 }
 360         }
 361
 362         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 363                 return -EINVAL;
 364
 365         return 0;
 366 }
 367
 368 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 369 {
 370         unsigned int hdrlen = 24;
 371
 372         if (ieee80211_is_data(fc)) {
 373                 if (ieee80211_has_a4(fc))
 374                         hdrlen = 30;
 375                 if (ieee80211_is_data_qos(fc)) {
 376                         hdrlen += IEEE80211_QOS_CTL_LEN;
 377                         if (ieee80211_has_order(fc))
 378                                 hdrlen += IEEE80211_HT_CTL_LEN;
 379                 }
 380                 goto out;
 381         }
 382
 383         if (ieee80211_is_mgmt(fc)) {
 384                 if (ieee80211_has_order(fc))
 385                         hdrlen += IEEE80211_HT_CTL_LEN;
 386                 goto out;
 387         }
 388
 389         if (ieee80211_is_ctl(fc)) {
 390                 /*
 391                  * ACK and CTS are 10 bytes, all others 16. To see how
 392                  * to get this condition consider
 393                  *   subtype mask:   0b0000000011110000 (0x00F0)
 394                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 395                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 396                  *   bits that matter:         ^^^      (0x00E0)
 397                  *   value of those: 0b0000000011000000 (0x00C0)
 398                  */
 399                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 400                         hdrlen = 10;
 401                 else
 402                         hdrlen = 16;
 403         }
 404 out:
 405         return hdrlen;
 406 }
 407 EXPORT_SYMBOL(ieee80211_hdrlen);
 408
 409 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 410 {
 411         const struct ieee80211_hdr *hdr =
 412                         (const struct ieee80211_hdr *)skb->data;
 413         unsigned int hdrlen;
 414
 415         if (unlikely(skb->len < 10))
 416                 return 0;
 417         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 418         if (unlikely(hdrlen > skb->len))
 419                 return 0;
 420         return hdrlen;
 421 }
 422 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 423
 424 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 425 {
 426         int ae = flags & MESH_FLAGS_AE;
 427         /* 802.11-2012, 8.2.4.7.3 */
 428         switch (ae) {
 429         default:
 430         case 0:
 431                 return 6;
 432         case MESH_FLAGS_AE_A4:
 433                 return 12;
 434         case MESH_FLAGS_AE_A5_A6:
 435                 return 18;
 436         }
 437 }
 438
 439 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 440 {
 441         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 442 }
 443 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 444
 445 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 446                                   const u8 *addr, enum nl80211_iftype iftype,
 447                                   u8 data_offset)
 448 {
 449         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 450         struct {
 451                 u8 hdr[ETH_ALEN] __aligned(2);
 452                 __be16 proto;
 453         } payload;
 454         struct ethhdr tmp;
 455         u16 hdrlen;
 456         u8 mesh_flags = 0;
 457
 458         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 459                 return -1;
 460
 461         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 462         if (skb->len < hdrlen + 8)
 463                 return -1;
 464
 465         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 466          * header
 467          * IEEE 802.11 address fields:
 468          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 469          *   0     0   DA    SA    BSSID n/a
 470          *   0     1   DA    BSSID SA    n/a
 471          *   1     0   BSSID SA    DA    n/a
 472          *   1     1   RA    TA    DA    SA
 473          */
 474         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 475         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 476
 477         if (iftype == NL80211_IFTYPE_MESH_POINT)
 478                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 479
 480         mesh_flags &= MESH_FLAGS_AE;
 481
 482         switch (hdr->frame_control &
 483                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 484         case cpu_to_le16(IEEE80211_FCTL_TODS):
 485                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 486                              iftype != NL80211_IFTYPE_AP_VLAN &&
 487                              iftype != NL80211_IFTYPE_P2P_GO))
 488                         return -1;
 489                 break;
 490         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 491                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 492                              iftype != NL80211_IFTYPE_MESH_POINT &&
 493                              iftype != NL80211_IFTYPE_AP_VLAN &&
 494                              iftype != NL80211_IFTYPE_STATION))
 495                         return -1;
 496                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 497                         if (mesh_flags == MESH_FLAGS_AE_A4)
 498                                 return -1;
 499                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 500                                 skb_copy_bits(skb, hdrlen +
 501                                         offsetof(struct ieee80211s_hdr, eaddr1),
 502                                         tmp.h_dest, 2 * ETH_ALEN);
 503                         }
 504                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 505                 }
 506                 break;
 507         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 508                 if ((iftype != NL80211_IFTYPE_STATION &&
 509                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 510                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 511                     (is_multicast_ether_addr(tmp.h_dest) &&
 512                      ether_addr_equal(tmp.h_source, addr)))
 513                         return -1;
 514                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 515                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 516                                 return -1;
 517                         if (mesh_flags == MESH_FLAGS_AE_A4)
 518                                 skb_copy_bits(skb, hdrlen +
 519                                         offsetof(struct ieee80211s_hdr, eaddr1),
 520                                         tmp.h_source, ETH_ALEN);
 521                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 522                 }
 523                 break;
 524         case cpu_to_le16(0):
 525                 if (iftype != NL80211_IFTYPE_ADHOC &&
 526                     iftype != NL80211_IFTYPE_STATION &&
 527                     iftype != NL80211_IFTYPE_OCB)
 528                                 return -1;
 529                 break;
 530         }
 531
 532         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 533         tmp.h_proto = payload.proto;
 534
 535         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 536                     tmp.h_proto != htons(ETH_P_AARP) &&
 537                     tmp.h_proto != htons(ETH_P_IPX)) ||
 538                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 539                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 540                  * replace EtherType */
 541                 hdrlen += ETH_ALEN + 2;
 542         else
 543                 tmp.h_proto = htons(skb->len - hdrlen);
 544
 545         pskb_pull(skb, hdrlen);
 546
 547         if (!ehdr)
 548                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 549         memcpy(ehdr, &tmp, sizeof(tmp));
 550
 551         return 0;
 552 }
 553 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 554
 555 static void
 556 __frame_add_frag(struct sk_buff *skb, struct page *page,
 557                  void *ptr, int len, int size)
 558 {
 559         struct skb_shared_info *sh = skb_shinfo(skb);
 560         int page_offset;
 561
 562         page_ref_inc(page);
 563         page_offset = ptr - page_address(page);
 564         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 565 }
 566
 567 static void
 568 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 569                             int offset, int len)
 570 {
 571         struct skb_shared_info *sh = skb_shinfo(skb);
 572         const skb_frag_t *frag = &sh->frags[0];
 573         struct page *frag_page;
 574         void *frag_ptr;
 575         int frag_len, frag_size;
 576         int head_size = skb->len - skb->data_len;
 577         int cur_len;
 578
 579         frag_page = virt_to_head_page(skb->head);
 580         frag_ptr = skb->data;
 581         frag_size = head_size;
 582
 583         while (offset >= frag_size) {
 584                 offset -= frag_size;
 585                 frag_page = skb_frag_page(frag);
 586                 frag_ptr = skb_frag_address(frag);
 587                 frag_size = skb_frag_size(frag);
 588                 frag++;
 589         }
 590
 591         frag_ptr += offset;
 592         frag_len = frag_size - offset;
 593
 594         cur_len = min(len, frag_len);
 595
 596         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 597         len -= cur_len;
 598
 599         while (len > 0) {
 600                 frag_len = skb_frag_size(frag);
 601                 cur_len = min(len, frag_len);
 602                 __frame_add_frag(frame, skb_frag_page(frag),
 603                                  skb_frag_address(frag), cur_len, frag_len);
 604                 len -= cur_len;
 605                 frag++;
 606         }
 607 }
 608
 609 static struct sk_buff *
 610 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 611                        int offset, int len, bool reuse_frag)
 612 {
 613         struct sk_buff *frame;
 614         int cur_len = len;
 615
 616         if (skb->len - offset < len)
 617                 return NULL;
 618
 619         /*
 620          * When reusing framents, copy some data to the head to simplify
 621          * ethernet header handling and speed up protocol header processing
 622          * in the stack later.
 623          */
 624         if (reuse_frag)
 625                 cur_len = min_t(int, len, 32);
 626
 627         /*
 628          * Allocate and reserve two bytes more for payload
 629          * alignment since sizeof(struct ethhdr) is 14.
 630          */
 631         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 632         if (!frame)
 633                 return NULL;
 634
 635         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 636         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 637
 638         len -= cur_len;
 639         if (!len)
 640                 return frame;
 641
 642         offset += cur_len;
 643         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 644
 645         return frame;
 646 }
 647
 648 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 649                               const u8 *addr, enum nl80211_iftype iftype,
 650                               const unsigned int extra_headroom,
 651                               const u8 *check_da, const u8 *check_sa)
 652 {
 653         unsigned int hlen = ALIGN(extra_headroom, 4);
 654         struct sk_buff *frame = NULL;
 655         u16 ethertype;
 656         u8 *payload;
 657         int offset = 0, remaining;
 658         struct ethhdr eth;
 659         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 660         bool reuse_skb = false;
 661         bool last = false;
 662
 663         while (!last) {
 664                 unsigned int subframe_len;
 665                 int len;
 666                 u8 padding;
 667
 668                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 669                 len = ntohs(eth.h_proto);
 670                 subframe_len = sizeof(struct ethhdr) + len;
 671                 padding = (4 - subframe_len) & 0x3;
 672
 673                 /* the last MSDU has no padding */
 674                 remaining = skb->len - offset;
 675                 if (subframe_len > remaining)
 676                         goto purge;
 677
 678                 offset += sizeof(struct ethhdr);
 679                 last = remaining <= subframe_len + padding;
 680
 681                 /* FIXME: should we really accept multicast DA? */
 682                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 683                      !ether_addr_equal(check_da, eth.h_dest)) ||
 684                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 685                         offset += len + padding;
 686                         continue;
 687                 }
 688
 689                 /* reuse skb for the last subframe */
 690                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 691                         skb_pull(skb, offset);
 692                         frame = skb;
 693                         reuse_skb = true;
 694                 } else {
 695                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 696                                                        reuse_frag);
 697                         if (!frame)
 698                                 goto purge;
 699
 700                         offset += len + padding;
 701                 }
 702
 703                 skb_reset_network_header(frame);
 704                 frame->dev = skb->dev;
 705                 frame->priority = skb->priority;
 706
 707                 payload = frame->data;
 708                 ethertype = (payload[6] << 8) | payload[7];
 709                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 710                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 711                            ether_addr_equal(payload, bridge_tunnel_header))) {
 712                         eth.h_proto = htons(ethertype);
 713                         skb_pull(frame, ETH_ALEN + 2);
 714                 }
 715
 716                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 717                 __skb_queue_tail(list, frame);
 718         }
 719
 720         if (!reuse_skb)
 721                 dev_kfree_skb(skb);
 722
 723         return;
 724
 725  purge:
 726         __skb_queue_purge(list);
 727         dev_kfree_skb(skb);
 728 }
 729 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 730
 731 /* Given a data frame determine the 802.1p/1d tag to use. */
 732 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 733                                     struct cfg80211_qos_map *qos_map)
 734 {
 735         unsigned int dscp;
 736         unsigned char vlan_priority;
 737         unsigned int ret;
 738
 739         /* skb->priority values from 256->263 are magic values to
 740          * directly indicate a specific 802.1d priority.  This is used
 741          * to allow 802.1d priority to be passed directly in from VLAN
 742          * tags, etc.
 743          */
 744         if (skb->priority >= 256 && skb->priority <= 263) {
 745                 ret = skb->priority - 256;
 746                 goto out;
 747         }
 748
 749         if (skb_vlan_tag_present(skb)) {
 750                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 751                         >> VLAN_PRIO_SHIFT;
 752                 if (vlan_priority > 0) {
 753                         ret = vlan_priority;
 754                         goto out;
 755                 }
 756         }
 757
 758         switch (skb->protocol) {
 759         case htons(ETH_P_IP):
 760                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 761                 break;
 762         case htons(ETH_P_IPV6):
 763                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 764                 break;
 765         case htons(ETH_P_MPLS_UC):
 766         case htons(ETH_P_MPLS_MC): {
 767                 struct mpls_label mpls_tmp, *mpls;
 768
 769                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 770                                           sizeof(*mpls), &mpls_tmp);
 771                 if (!mpls)
 772                         return 0;
 773
 774                 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 775                         >> MPLS_LS_TC_SHIFT;
 776                 goto out;
 777         }
 778         case htons(ETH_P_80221):
 779                 /* 802.21 is always network control traffic */
 780                 return 7;
 781         default:
 782                 return 0;
 783         }
 784
 785         if (qos_map) {
 786                 unsigned int i, tmp_dscp = dscp >> 2;
 787
 788                 for (i = 0; i < qos_map->num_des; i++) {
 789                         if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
 790                                 ret = qos_map->dscp_exception[i].up;
 791                                 goto out;
 792                         }
 793                 }
 794
 795                 for (i = 0; i < 8; i++) {
 796                         if (tmp_dscp >= qos_map->up[i].low &&
 797                             tmp_dscp <= qos_map->up[i].high) {
 798                                 ret = i;
 799                                 goto out;
 800                         }
 801                 }
 802         }
 803
 804         ret = dscp >> 5;
 805 out:
 806         return array_index_nospec(ret, IEEE80211_NUM_TIDS);
 807 }
 808 EXPORT_SYMBOL(cfg80211_classify8021d);
 809
 810 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
 811 {
 812         const struct cfg80211_bss_ies *ies;
 813
 814         ies = rcu_dereference(bss->ies);
 815         if (!ies)
 816                 return NULL;
 817
 818         return cfg80211_find_elem(id, ies->data, ies->len);
 819 }
 820 EXPORT_SYMBOL(ieee80211_bss_get_elem);
 821
 822 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 823 {
 824         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 825         struct net_device *dev = wdev->netdev;
 826         int i;
 827
 828         if (!wdev->connect_keys)
 829                 return;
 830
 831         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 832                 if (!wdev->connect_keys->params[i].cipher)
 833                         continue;
 834                 if (rdev_add_key(rdev, dev, i, false, NULL,
 835                                  &wdev->connect_keys->params[i])) {
 836                         netdev_err(dev, "failed to set key %d\n", i);
 837                         continue;
 838                 }
 839                 if (wdev->connect_keys->def == i &&
 840                     rdev_set_default_key(rdev, dev, i, true, true)) {
 841                         netdev_err(dev, "failed to set defkey %d\n", i);
 842                         continue;
 843                 }
 844         }
 845
 846         kzfree(wdev->connect_keys);
 847         wdev->connect_keys = NULL;
 848 }
 849
 850 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 851 {
 852         struct cfg80211_event *ev;
 853         unsigned long flags;
 854
 855         spin_lock_irqsave(&wdev->event_lock, flags);
 856         while (!list_empty(&wdev->event_list)) {
 857                 ev = list_first_entry(&wdev->event_list,
 858                                       struct cfg80211_event, list);
 859                 list_del(&ev->list);
 860                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 861
 862                 wdev_lock(wdev);
 863                 switch (ev->type) {
 864                 case EVENT_CONNECT_RESULT:
 865                         __cfg80211_connect_result(
 866                                 wdev->netdev,
 867                                 &ev->cr,
 868                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 869                         break;
 870                 case EVENT_ROAMED:
 871                         __cfg80211_roamed(wdev, &ev->rm);
 872                         break;
 873                 case EVENT_DISCONNECTED:
 874                         __cfg80211_disconnected(wdev->netdev,
 875                                                 ev->dc.ie, ev->dc.ie_len,
 876                                                 ev->dc.reason,
 877                                                 !ev->dc.locally_generated);
 878                         break;
 879                 case EVENT_IBSS_JOINED:
 880                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 881                                                ev->ij.channel);
 882                         break;
 883                 case EVENT_STOPPED:
 884                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 885                         break;
 886                 case EVENT_PORT_AUTHORIZED:
 887                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 888                         break;
 889                 }
 890                 wdev_unlock(wdev);
 891
 892                 kfree(ev);
 893
 894                 spin_lock_irqsave(&wdev->event_lock, flags);
 895         }
 896         spin_unlock_irqrestore(&wdev->event_lock, flags);
 897 }
 898
 899 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 900 {
 901         struct wireless_dev *wdev;
 902
 903         ASSERT_RTNL();
 904
 905         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 906                 cfg80211_process_wdev_events(wdev);
 907 }
 908
 909 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 910                           struct net_device *dev, enum nl80211_iftype ntype,
 911                           struct vif_params *params)
 912 {
 913         int err;
 914         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 915
 916         ASSERT_RTNL();
 917
 918         /* don't support changing VLANs, you just re-create them */
 919         if (otype == NL80211_IFTYPE_AP_VLAN)
 920                 return -EOPNOTSUPP;
 921
 922         /* cannot change into P2P device or NAN */
 923         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 924             ntype == NL80211_IFTYPE_NAN)
 925                 return -EOPNOTSUPP;
 926
 927         if (!rdev->ops->change_virtual_intf ||
 928             !(rdev->wiphy.interface_modes & (1 << ntype)))
 929                 return -EOPNOTSUPP;
 930
 931         /* if it's part of a bridge, reject changing type to station/ibss */
 932         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 933             (ntype == NL80211_IFTYPE_ADHOC ||
 934              ntype == NL80211_IFTYPE_STATION ||
 935              ntype == NL80211_IFTYPE_P2P_CLIENT))
 936                 return -EBUSY;
 937
 938         if (ntype != otype) {
 939                 dev->ieee80211_ptr->use_4addr = false;
 940                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 941                 wdev_lock(dev->ieee80211_ptr);
 942                 rdev_set_qos_map(rdev, dev, NULL);
 943                 wdev_unlock(dev->ieee80211_ptr);
 944
 945                 switch (otype) {
 946                 case NL80211_IFTYPE_AP:
 947                         cfg80211_stop_ap(rdev, dev, true);
 948                         break;
 949                 case NL80211_IFTYPE_ADHOC:
 950                         cfg80211_leave_ibss(rdev, dev, false);
 951                         break;
 952                 case NL80211_IFTYPE_STATION:
 953                 case NL80211_IFTYPE_P2P_CLIENT:
 954                         wdev_lock(dev->ieee80211_ptr);
 955                         cfg80211_disconnect(rdev, dev,
 956                                             WLAN_REASON_DEAUTH_LEAVING, true);
 957                         wdev_unlock(dev->ieee80211_ptr);
 958                         break;
 959                 case NL80211_IFTYPE_MESH_POINT:
 960                         /* mesh should be handled? */
 961                         break;
 962                 default:
 963                         break;
 964                 }
 965
 966                 cfg80211_process_rdev_events(rdev);
 967         }
 968
 969         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 970
 971         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 972
 973         if (!err && params && params->use_4addr != -1)
 974                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 975
 976         if (!err) {
 977                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 978                 switch (ntype) {
 979                 case NL80211_IFTYPE_STATION:
 980                         if (dev->ieee80211_ptr->use_4addr)
 981                                 break;
 982                         /* fall through */
 983                 case NL80211_IFTYPE_OCB:
 984                 case NL80211_IFTYPE_P2P_CLIENT:
 985                 case NL80211_IFTYPE_ADHOC:
 986                         dev->priv_flags |= IFF_DONT_BRIDGE;
 987                         break;
 988                 case NL80211_IFTYPE_P2P_GO:
 989                 case NL80211_IFTYPE_AP:
 990                 case NL80211_IFTYPE_AP_VLAN:
 991                 case NL80211_IFTYPE_WDS:
 992                 case NL80211_IFTYPE_MESH_POINT:
 993                         /* bridging OK */
 994                         break;
 995                 case NL80211_IFTYPE_MONITOR:
 996                         /* monitor can't bridge anyway */
 997                         break;
 998                 case NL80211_IFTYPE_UNSPECIFIED:
 999                 case NUM_NL80211_IFTYPES:
1000                         /* not happening */
1001                         break;
1002                 case NL80211_IFTYPE_P2P_DEVICE:
1003                 case NL80211_IFTYPE_NAN:
1004                         WARN_ON(1);
1005                         break;
1006                 }
1007         }
1008
1009         if (!err && ntype != otype && netif_running(dev)) {
1010                 cfg80211_update_iface_num(rdev, ntype, 1);
1011                 cfg80211_update_iface_num(rdev, otype, -1);
1012         }
1013
1014         return err;
1015 }
1016
1017 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1018 {
1019         int modulation, streams, bitrate;
1020
1021         /* the formula below does only work for MCS values smaller than 32 */
1022         if (WARN_ON_ONCE(rate->mcs >= 32))
1023                 return 0;
1024
1025         modulation = rate->mcs & 7;
1026         streams = (rate->mcs >> 3) + 1;
1027
1028         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1029
1030         if (modulation < 4)
1031                 bitrate *= (modulation + 1);
1032         else if (modulation == 4)
1033                 bitrate *= (modulation + 2);
1034         else
1035                 bitrate *= (modulation + 3);
1036
1037         bitrate *= streams;
1038
1039         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1040                 bitrate = (bitrate / 9) * 10;
1041
1042         /* do NOT round down here */
1043         return (bitrate + 50000) / 100000;
1044 }
1045
1046 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1047 {
1048         static const u32 __mcs2bitrate[] = {
1049                 /* control PHY */
1050                 [0] =   275,
1051                 /* SC PHY */
1052                 [1] =  3850,
1053                 [2] =  7700,
1054                 [3] =  9625,
1055                 [4] = 11550,
1056                 [5] = 12512, /* 1251.25 mbps */
1057                 [6] = 15400,
1058                 [7] = 19250,
1059                 [8] = 23100,
1060                 [9] = 25025,
1061                 [10] = 30800,
1062                 [11] = 38500,
1063                 [12] = 46200,
1064                 /* OFDM PHY */
1065                 [13] =  6930,
1066                 [14] =  8662, /* 866.25 mbps */
1067                 [15] = 13860,
1068                 [16] = 17325,
1069                 [17] = 20790,
1070                 [18] = 27720,
1071                 [19] = 34650,
1072                 [20] = 41580,
1073                 [21] = 45045,
1074                 [22] = 51975,
1075                 [23] = 62370,
1076                 [24] = 67568, /* 6756.75 mbps */
1077                 /* LP-SC PHY */
1078                 [25] =  6260,
1079                 [26] =  8340,
1080                 [27] = 11120,
1081                 [28] = 12510,
1082                 [29] = 16680,
1083                 [30] = 22240,
1084                 [31] = 25030,
1085         };
1086
1087         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1088                 return 0;
1089
1090         return __mcs2bitrate[rate->mcs];
1091 }
1092
1093 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1094 {
1095         static const u32 base[4][10] = {
1096                 {   6500000,
1097                    13000000,
1098                    19500000,
1099                    26000000,
1100                    39000000,
1101                    52000000,
1102                    58500000,
1103                    65000000,
1104                    78000000,
1105                 /* not in the spec, but some devices use this: */
1106                    86500000,
1107                 },
1108                 {  13500000,
1109                    27000000,
1110                    40500000,
1111                    54000000,
1112                    81000000,
1113                   108000000,
1114                   121500000,
1115                   135000000,
1116                   162000000,
1117                   180000000,
1118                 },
1119                 {  29300000,
1120                    58500000,
1121                    87800000,
1122                   117000000,
1123                   175500000,
1124                   234000000,
1125                   263300000,
1126                   292500000,
1127                   351000000,
1128                   390000000,
1129                 },
1130                 {  58500000,
1131                   117000000,
1132                   175500000,
1133                   234000000,
1134                   351000000,
1135                   468000000,
1136                   526500000,
1137                   585000000,
1138                   702000000,
1139                   780000000,
1140                 },
1141         };
1142         u32 bitrate;
1143         int idx;
1144
1145         if (rate->mcs > 9)
1146                 goto warn;
1147
1148         switch (rate->bw) {
1149         case RATE_INFO_BW_160:
1150                 idx = 3;
1151                 break;
1152         case RATE_INFO_BW_80:
1153                 idx = 2;
1154                 break;
1155         case RATE_INFO_BW_40:
1156                 idx = 1;
1157                 break;
1158         case RATE_INFO_BW_5:
1159         case RATE_INFO_BW_10:
1160         default:
1161                 goto warn;
1162         case RATE_INFO_BW_20:
1163                 idx = 0;
1164         }
1165
1166         bitrate = base[idx][rate->mcs];
1167         bitrate *= rate->nss;
1168
1169         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1170                 bitrate = (bitrate / 9) * 10;
1171
1172         /* do NOT round down here */
1173         return (bitrate + 50000) / 100000;
1174  warn:
1175         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1176                   rate->bw, rate->mcs, rate->nss);
1177         return 0;
1178 }
1179
1180 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1181 {
1182 #define SCALE 2048
1183         u16 mcs_divisors[12] = {
1184                 34133, /* 16.666666... */
1185                 17067, /*  8.333333... */
1186                 11378, /*  5.555555... */
1187                  8533, /*  4.166666... */
1188                  5689, /*  2.777777... */
1189                  4267, /*  2.083333... */
1190                  3923, /*  1.851851... */
1191                  3413, /*  1.666666... */
1192                  2844, /*  1.388888... */
1193                  2560, /*  1.250000... */
1194                  2276, /*  1.111111... */
1195                  2048, /*  1.000000... */
1196         };
1197         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1198         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1199         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1200         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1201         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1202         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1203         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1204         u64 tmp;
1205         u32 result;
1206
1207         if (WARN_ON_ONCE(rate->mcs > 11))
1208                 return 0;
1209
1210         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1211                 return 0;
1212         if (WARN_ON_ONCE(rate->he_ru_alloc >
1213                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1214                 return 0;
1215         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1216                 return 0;
1217
1218         if (rate->bw == RATE_INFO_BW_160)
1219                 result = rates_160M[rate->he_gi];
1220         else if (rate->bw == RATE_INFO_BW_80 ||
1221                  (rate->bw == RATE_INFO_BW_HE_RU &&
1222                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1223                 result = rates_969[rate->he_gi];
1224         else if (rate->bw == RATE_INFO_BW_40 ||
1225                  (rate->bw == RATE_INFO_BW_HE_RU &&
1226                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1227                 result = rates_484[rate->he_gi];
1228         else if (rate->bw == RATE_INFO_BW_20 ||
1229                  (rate->bw == RATE_INFO_BW_HE_RU &&
1230                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1231                 result = rates_242[rate->he_gi];
1232         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1233                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1234                 result = rates_106[rate->he_gi];
1235         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1236                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1237                 result = rates_52[rate->he_gi];
1238         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1239                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1240                 result = rates_26[rate->he_gi];
1241         else {
1242                 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1243                      rate->bw, rate->he_ru_alloc);
1244                 return 0;
1245         }
1246
1247         /* now scale to the appropriate MCS */
1248         tmp = result;
1249         tmp *= SCALE;
1250         do_div(tmp, mcs_divisors[rate->mcs]);
1251         result = tmp;
1252
1253         /* and take NSS, DCM into account */
1254         result = (result * rate->nss) / 8;
1255         if (rate->he_dcm)
1256                 result /= 2;
1257
1258         return result / 10000;
1259 }
1260
1261 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1262 {
1263         if (rate->flags & RATE_INFO_FLAGS_MCS)
1264                 return cfg80211_calculate_bitrate_ht(rate);
1265         if (rate->flags & RATE_INFO_FLAGS_60G)
1266                 return cfg80211_calculate_bitrate_60g(rate);
1267         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1268                 return cfg80211_calculate_bitrate_vht(rate);
1269         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1270                 return cfg80211_calculate_bitrate_he(rate);
1271
1272         return rate->legacy;
1273 }
1274 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1275
1276 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1277                           enum ieee80211_p2p_attr_id attr,
1278                           u8 *buf, unsigned int bufsize)
1279 {
1280         u8 *out = buf;
1281         u16 attr_remaining = 0;
1282         bool desired_attr = false;
1283         u16 desired_len = 0;
1284
1285         while (len > 0) {
1286                 unsigned int iedatalen;
1287                 unsigned int copy;
1288                 const u8 *iedata;
1289
1290                 if (len < 2)
1291                         return -EILSEQ;
1292                 iedatalen = ies[1];
1293                 if (iedatalen + 2 > len)
1294                         return -EILSEQ;
1295
1296                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1297                         goto cont;
1298
1299                 if (iedatalen < 4)
1300                         goto cont;
1301
1302                 iedata = ies + 2;
1303
1304                 /* check WFA OUI, P2P subtype */
1305                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1306                     iedata[2] != 0x9a || iedata[3] != 0x09)
1307                         goto cont;
1308
1309                 iedatalen -= 4;
1310                 iedata += 4;
1311
1312                 /* check attribute continuation into this IE */
1313                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1314                 if (copy && desired_attr) {
1315                         desired_len += copy;
1316                         if (out) {
1317                                 memcpy(out, iedata, min(bufsize, copy));
1318                                 out += min(bufsize, copy);
1319                                 bufsize -= min(bufsize, copy);
1320                         }
1321
1322
1323                         if (copy == attr_remaining)
1324                                 return desired_len;
1325                 }
1326
1327                 attr_remaining -= copy;
1328                 if (attr_remaining)
1329                         goto cont;
1330
1331                 iedatalen -= copy;
1332                 iedata += copy;
1333
1334                 while (iedatalen > 0) {
1335                         u16 attr_len;
1336
1337                         /* P2P attribute ID & size must fit */
1338                         if (iedatalen < 3)
1339                                 return -EILSEQ;
1340                         desired_attr = iedata[0] == attr;
1341                         attr_len = get_unaligned_le16(iedata + 1);
1342                         iedatalen -= 3;
1343                         iedata += 3;
1344
1345                         copy = min_t(unsigned int, attr_len, iedatalen);
1346
1347                         if (desired_attr) {
1348                                 desired_len += copy;
1349                                 if (out) {
1350                                         memcpy(out, iedata, min(bufsize, copy));
1351                                         out += min(bufsize, copy);
1352                                         bufsize -= min(bufsize, copy);
1353                                 }
1354
1355                                 if (copy == attr_len)
1356                                         return desired_len;
1357                         }
1358
1359                         iedata += copy;
1360                         iedatalen -= copy;
1361                         attr_remaining = attr_len - copy;
1362                 }
1363
1364  cont:
1365                 len -= ies[1] + 2;
1366                 ies += ies[1] + 2;
1367         }
1368
1369         if (attr_remaining && desired_attr)
1370                 return -EILSEQ;
1371
1372         return -ENOENT;
1373 }
1374 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1375
1376 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1377 {
1378         int i;
1379
1380         /* Make sure array values are legal */
1381         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1382                 return false;
1383
1384         i = 0;
1385         while (i < n_ids) {
1386                 if (ids[i] == WLAN_EID_EXTENSION) {
1387                         if (id_ext && (ids[i + 1] == id))
1388                                 return true;
1389
1390                         i += 2;
1391                         continue;
1392                 }
1393
1394                 if (ids[i] == id && !id_ext)
1395                         return true;
1396
1397                 i++;
1398         }
1399         return false;
1400 }
1401
1402 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1403 {
1404         /* we assume a validly formed IEs buffer */
1405         u8 len = ies[pos + 1];
1406
1407         pos += 2 + len;
1408
1409         /* the IE itself must have 255 bytes for fragments to follow */
1410         if (len < 255)
1411                 return pos;
1412
1413         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1414                 len = ies[pos + 1];
1415                 pos += 2 + len;
1416         }
1417
1418         return pos;
1419 }
1420
1421 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1422                               const u8 *ids, int n_ids,
1423                               const u8 *after_ric, int n_after_ric,
1424                               size_t offset)
1425 {
1426         size_t pos = offset;
1427
1428         while (pos < ielen) {
1429                 u8 ext = 0;
1430
1431                 if (ies[pos] == WLAN_EID_EXTENSION)
1432                         ext = 2;
1433                 if ((pos + ext) >= ielen)
1434                         break;
1435
1436                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1437                                           ies[pos] == WLAN_EID_EXTENSION))
1438                         break;
1439
1440                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1441                         pos = skip_ie(ies, ielen, pos);
1442
1443                         while (pos < ielen) {
1444                                 if (ies[pos] == WLAN_EID_EXTENSION)
1445                                         ext = 2;
1446                                 else
1447                                         ext = 0;
1448
1449                                 if ((pos + ext) >= ielen)
1450                                         break;
1451
1452                                 if (!ieee80211_id_in_list(after_ric,
1453                                                           n_after_ric,
1454                                                           ies[pos + ext],
1455                                                           ext == 2))
1456                                         pos = skip_ie(ies, ielen, pos);
1457                                 else
1458                                         break;
1459                         }
1460                 } else {
1461                         pos = skip_ie(ies, ielen, pos);
1462                 }
1463         }
1464
1465         return pos;
1466 }
1467 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1468
1469 bool ieee80211_operating_class_to_band(u8 operating_class,
1470                                        enum nl80211_band *band)
1471 {
1472         switch (operating_class) {
1473         case 112:
1474         case 115 ... 127:
1475         case 128 ... 130:
1476                 *band = NL80211_BAND_5GHZ;
1477                 return true;
1478         case 131 ... 135:
1479                 *band = NL80211_BAND_6GHZ;
1480                 return true;
1481         case 81:
1482         case 82:
1483         case 83:
1484         case 84:
1485                 *band = NL80211_BAND_2GHZ;
1486                 return true;
1487         case 180:
1488                 *band = NL80211_BAND_60GHZ;
1489                 return true;
1490         }
1491
1492         return false;
1493 }
1494 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1495
1496 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1497                                           u8 *op_class)
1498 {
1499         u8 vht_opclass;
1500         u32 freq = chandef->center_freq1;
1501
1502         if (freq >= 2412 && freq <= 2472) {
1503                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1504                         return false;
1505
1506                 /* 2.407 GHz, channels 1..13 */
1507                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1508                         if (freq > chandef->chan->center_freq)
1509                                 *op_class = 83; /* HT40+ */
1510                         else
1511                                 *op_class = 84; /* HT40- */
1512                 } else {
1513                         *op_class = 81;
1514                 }
1515
1516                 return true;
1517         }
1518
1519         if (freq == 2484) {
1520                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1521                         return false;
1522
1523                 *op_class = 82; /* channel 14 */
1524                 return true;
1525         }
1526
1527         switch (chandef->width) {
1528         case NL80211_CHAN_WIDTH_80:
1529                 vht_opclass = 128;
1530                 break;
1531         case NL80211_CHAN_WIDTH_160:
1532                 vht_opclass = 129;
1533                 break;
1534         case NL80211_CHAN_WIDTH_80P80:
1535                 vht_opclass = 130;
1536                 break;
1537         case NL80211_CHAN_WIDTH_10:
1538         case NL80211_CHAN_WIDTH_5:
1539                 return false; /* unsupported for now */
1540         default:
1541                 vht_opclass = 0;
1542                 break;
1543         }
1544
1545         /* 5 GHz, channels 36..48 */
1546         if (freq >= 5180 && freq <= 5240) {
1547                 if (vht_opclass) {
1548                         *op_class = vht_opclass;
1549                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1550                         if (freq > chandef->chan->center_freq)
1551                                 *op_class = 116;
1552                         else
1553                                 *op_class = 117;
1554                 } else {
1555                         *op_class = 115;
1556                 }
1557
1558                 return true;
1559         }
1560
1561         /* 5 GHz, channels 52..64 */
1562         if (freq >= 5260 && freq <= 5320) {
1563                 if (vht_opclass) {
1564                         *op_class = vht_opclass;
1565                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1566                         if (freq > chandef->chan->center_freq)
1567                                 *op_class = 119;
1568                         else
1569                                 *op_class = 120;
1570                 } else {
1571                         *op_class = 118;
1572                 }
1573
1574                 return true;
1575         }
1576
1577         /* 5 GHz, channels 100..144 */
1578         if (freq >= 5500 && freq <= 5720) {
1579                 if (vht_opclass) {
1580                         *op_class = vht_opclass;
1581                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1582                         if (freq > chandef->chan->center_freq)
1583                                 *op_class = 122;
1584                         else
1585                                 *op_class = 123;
1586                 } else {
1587                         *op_class = 121;
1588                 }
1589
1590                 return true;
1591         }
1592
1593         /* 5 GHz, channels 149..169 */
1594         if (freq >= 5745 && freq <= 5845) {
1595                 if (vht_opclass) {
1596                         *op_class = vht_opclass;
1597                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1598                         if (freq > chandef->chan->center_freq)
1599                                 *op_class = 126;
1600                         else
1601                                 *op_class = 127;
1602                 } else if (freq <= 5805) {
1603                         *op_class = 124;
1604                 } else {
1605                         *op_class = 125;
1606                 }
1607
1608                 return true;
1609         }
1610
1611         /* 56.16 GHz, channel 1..4 */
1612         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1613                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1614                         return false;
1615
1616                 *op_class = 180;
1617                 return true;
1618         }
1619
1620         /* not supported yet */
1621         return false;
1622 }
1623 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1624
1625 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1626                                        u32 *beacon_int_gcd,
1627                                        bool *beacon_int_different)
1628 {
1629         struct wireless_dev *wdev;
1630
1631         *beacon_int_gcd = 0;
1632         *beacon_int_different = false;
1633
1634         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1635                 if (!wdev->beacon_interval)
1636                         continue;
1637
1638                 if (!*beacon_int_gcd) {
1639                         *beacon_int_gcd = wdev->beacon_interval;
1640                         continue;
1641                 }
1642
1643                 if (wdev->beacon_interval == *beacon_int_gcd)
1644                         continue;
1645
1646                 *beacon_int_different = true;
1647                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1648         }
1649
1650         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1651                 if (*beacon_int_gcd)
1652                         *beacon_int_different = true;
1653                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1654         }
1655 }
1656
1657 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1658                                  enum nl80211_iftype iftype, u32 beacon_int)
1659 {
1660         /*
1661          * This is just a basic pre-condition check; if interface combinations
1662          * are possible the driver must already be checking those with a call
1663          * to cfg80211_check_combinations(), in which case we'll validate more
1664          * through the cfg80211_calculate_bi_data() call and code in
1665          * cfg80211_iter_combinations().
1666          */
1667
1668         if (beacon_int < 10 || beacon_int > 10000)
1669                 return -EINVAL;
1670
1671         return 0;
1672 }
1673
1674 int cfg80211_iter_combinations(struct wiphy *wiphy,
1675                                struct iface_combination_params *params,
1676                                void (*iter)(const struct ieee80211_iface_combination *c,
1677                                             void *data),
1678                                void *data)
1679 {
1680         const struct ieee80211_regdomain *regdom;
1681         enum nl80211_dfs_regions region = 0;
1682         int i, j, iftype;
1683         int num_interfaces = 0;
1684         u32 used_iftypes = 0;
1685         u32 beacon_int_gcd;
1686         bool beacon_int_different;
1687
1688         /*
1689          * This is a bit strange, since the iteration used to rely only on
1690          * the data given by the driver, but here it now relies on context,
1691          * in form of the currently operating interfaces.
1692          * This is OK for all current users, and saves us from having to
1693          * push the GCD calculations into all the drivers.
1694          * In the future, this should probably rely more on data that's in
1695          * cfg80211 already - the only thing not would appear to be any new
1696          * interfaces (while being brought up) and channel/radar data.
1697          */
1698         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1699                                    &beacon_int_gcd, &beacon_int_different);
1700
1701         if (params->radar_detect) {
1702                 rcu_read_lock();
1703                 regdom = rcu_dereference(cfg80211_regdomain);
1704                 if (regdom)
1705                         region = regdom->dfs_region;
1706                 rcu_read_unlock();
1707         }
1708
1709         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1710                 num_interfaces += params->iftype_num[iftype];
1711                 if (params->iftype_num[iftype] > 0 &&
1712                     !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1713                         used_iftypes |= BIT(iftype);
1714         }
1715
1716         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1717                 const struct ieee80211_iface_combination *c;
1718                 struct ieee80211_iface_limit *limits;
1719                 u32 all_iftypes = 0;
1720
1721                 c = &wiphy->iface_combinations[i];
1722
1723                 if (num_interfaces > c->max_interfaces)
1724                         continue;
1725                 if (params->num_different_channels > c->num_different_channels)
1726                         continue;
1727
1728                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1729                                  GFP_KERNEL);
1730                 if (!limits)
1731                         return -ENOMEM;
1732
1733                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1734                         if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1735                                 continue;
1736                         for (j = 0; j < c->n_limits; j++) {
1737                                 all_iftypes |= limits[j].types;
1738                                 if (!(limits[j].types & BIT(iftype)))
1739                                         continue;
1740                                 if (limits[j].max < params->iftype_num[iftype])
1741                                         goto cont;
1742                                 limits[j].max -= params->iftype_num[iftype];
1743                         }
1744                 }
1745
1746                 if (params->radar_detect !=
1747                         (c->radar_detect_widths & params->radar_detect))
1748                         goto cont;
1749
1750                 if (params->radar_detect && c->radar_detect_regions &&
1751                     !(c->radar_detect_regions & BIT(region)))
1752                         goto cont;
1753
1754                 /* Finally check that all iftypes that we're currently
1755                  * using are actually part of this combination. If they
1756                  * aren't then we can't use this combination and have
1757                  * to continue to the next.
1758                  */
1759                 if ((all_iftypes & used_iftypes) != used_iftypes)
1760                         goto cont;
1761
1762                 if (beacon_int_gcd) {
1763                         if (c->beacon_int_min_gcd &&
1764                             beacon_int_gcd < c->beacon_int_min_gcd)
1765                                 goto cont;
1766                         if (!c->beacon_int_min_gcd && beacon_int_different)
1767                                 goto cont;
1768                 }
1769
1770                 /* This combination covered all interface types and
1771                  * supported the requested numbers, so we're good.
1772                  */
1773
1774                 (*iter)(c, data);
1775  cont:
1776                 kfree(limits);
1777         }
1778
1779         return 0;
1780 }
1781 EXPORT_SYMBOL(cfg80211_iter_combinations);
1782
1783 static void
1784 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1785                           void *data)
1786 {
1787         int *num = data;
1788         (*num)++;
1789 }
1790
1791 int cfg80211_check_combinations(struct wiphy *wiphy,
1792                                 struct iface_combination_params *params)
1793 {
1794         int err, num = 0;
1795
1796         err = cfg80211_iter_combinations(wiphy, params,
1797                                          cfg80211_iter_sum_ifcombs, &num);
1798         if (err)
1799                 return err;
1800         if (num == 0)
1801                 return -EBUSY;
1802
1803         return 0;
1804 }
1805 EXPORT_SYMBOL(cfg80211_check_combinations);
1806
1807 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1808                            const u8 *rates, unsigned int n_rates,
1809                            u32 *mask)
1810 {
1811         int i, j;
1812
1813         if (!sband)
1814                 return -EINVAL;
1815
1816         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1817                 return -EINVAL;
1818
1819         *mask = 0;
1820
1821         for (i = 0; i < n_rates; i++) {
1822                 int rate = (rates[i] & 0x7f) * 5;
1823                 bool found = false;
1824
1825                 for (j = 0; j < sband->n_bitrates; j++) {
1826                         if (sband->bitrates[j].bitrate == rate) {
1827                                 found = true;
1828                                 *mask |= BIT(j);
1829                                 break;
1830                         }
1831                 }
1832                 if (!found)
1833                         return -EINVAL;
1834         }
1835
1836         /*
1837          * mask must have at least one bit set here since we
1838          * didn't accept a 0-length rates array nor allowed
1839          * entries in the array that didn't exist
1840          */
1841
1842         return 0;
1843 }
1844
1845 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1846 {
1847         enum nl80211_band band;
1848         unsigned int n_channels = 0;
1849
1850         for (band = 0; band < NUM_NL80211_BANDS; band++)
1851                 if (wiphy->bands[band])
1852                         n_channels += wiphy->bands[band]->n_channels;
1853
1854         return n_channels;
1855 }
1856 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1857
1858 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1859                          struct station_info *sinfo)
1860 {
1861         struct cfg80211_registered_device *rdev;
1862         struct wireless_dev *wdev;
1863
1864         wdev = dev->ieee80211_ptr;
1865         if (!wdev)
1866                 return -EOPNOTSUPP;
1867
1868         rdev = wiphy_to_rdev(wdev->wiphy);
1869         if (!rdev->ops->get_station)
1870                 return -EOPNOTSUPP;
1871
1872         memset(sinfo, 0, sizeof(*sinfo));
1873
1874         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1875 }
1876 EXPORT_SYMBOL(cfg80211_get_station);
1877
1878 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1879 {
1880         int i;
1881
1882         if (!f)
1883                 return;
1884
1885         kfree(f->serv_spec_info);
1886         kfree(f->srf_bf);
1887         kfree(f->srf_macs);
1888         for (i = 0; i < f->num_rx_filters; i++)
1889                 kfree(f->rx_filters[i].filter);
1890
1891         for (i = 0; i < f->num_tx_filters; i++)
1892                 kfree(f->tx_filters[i].filter);
1893
1894         kfree(f->rx_filters);
1895         kfree(f->tx_filters);
1896         kfree(f);
1897 }
1898 EXPORT_SYMBOL(cfg80211_free_nan_func);
1899
1900 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1901                                 u32 center_freq_khz, u32 bw_khz)
1902 {
1903         u32 start_freq_khz, end_freq_khz;
1904
1905         start_freq_khz = center_freq_khz - (bw_khz / 2);
1906         end_freq_khz = center_freq_khz + (bw_khz / 2);
1907
1908         if (start_freq_khz >= freq_range->start_freq_khz &&
1909             end_freq_khz <= freq_range->end_freq_khz)
1910                 return true;
1911
1912         return false;
1913 }
1914
1915 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1916 {
1917         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1918                                 sizeof(*(sinfo->pertid)),
1919                                 gfp);
1920         if (!sinfo->pertid)
1921                 return -ENOMEM;
1922
1923         return 0;
1924 }
1925 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1926
1927 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1928 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1929 const unsigned char rfc1042_header[] __aligned(2) =
1930         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1931 EXPORT_SYMBOL(rfc1042_header);
1932
1933 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1934 const unsigned char bridge_tunnel_header[] __aligned(2) =
1935         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1936 EXPORT_SYMBOL(bridge_tunnel_header);
1937
1938 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
1939 struct iapp_layer2_update {
1940         u8 da[ETH_ALEN];        /* broadcast */
1941         u8 sa[ETH_ALEN];        /* STA addr */
1942         __be16 len;             /* 6 */
1943         u8 dsap;                /* 0 */
1944         u8 ssap;                /* 0 */
1945         u8 control;
1946         u8 xid_info[3];
1947 } __packed;
1948
1949 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
1950 {
1951         struct iapp_layer2_update *msg;
1952         struct sk_buff *skb;
1953
1954         /* Send Level 2 Update Frame to update forwarding tables in layer 2
1955          * bridge devices */
1956
1957         skb = dev_alloc_skb(sizeof(*msg));
1958         if (!skb)
1959                 return;
1960         msg = skb_put(skb, sizeof(*msg));
1961
1962         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
1963          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
1964
1965         eth_broadcast_addr(msg->da);
1966         ether_addr_copy(msg->sa, addr);
1967         msg->len = htons(6);
1968         msg->dsap = 0;
1969         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
1970         msg->control = 0xaf;    /* XID response lsb.1111F101.
1971                                  * F=0 (no poll command; unsolicited frame) */
1972         msg->xid_info[0] = 0x81;        /* XID format identifier */
1973         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
1974         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
1975
1976         skb->dev = dev;
1977         skb->protocol = eth_type_trans(skb, dev);
1978         memset(skb->cb, 0, sizeof(skb->cb));
1979         netif_rx_ni(skb);
1980 }
1981 EXPORT_SYMBOL(cfg80211_send_layer2_update);
1982
1983 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
1984                               enum ieee80211_vht_chanwidth bw,
1985                               int mcs, bool ext_nss_bw_capable)
1986 {
1987         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
1988         int max_vht_nss = 0;
1989         int ext_nss_bw;
1990         int supp_width;
1991         int i, mcs_encoding;
1992
1993         if (map == 0xffff)
1994                 return 0;
1995
1996         if (WARN_ON(mcs > 9))
1997                 return 0;
1998         if (mcs <= 7)
1999                 mcs_encoding = 0;
2000         else if (mcs == 8)
2001                 mcs_encoding = 1;
2002         else
2003                 mcs_encoding = 2;
2004
2005         /* find max_vht_nss for the given MCS */
2006         for (i = 7; i >= 0; i--) {
2007                 int supp = (map >> (2 * i)) & 3;
2008
2009                 if (supp == 3)
2010                         continue;
2011
2012                 if (supp >= mcs_encoding) {
2013                         max_vht_nss = i + 1;
2014                         break;
2015                 }
2016         }
2017
2018         if (!(cap->supp_mcs.tx_mcs_map &
2019                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2020                 return max_vht_nss;
2021
2022         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2023                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2024         supp_width = le32_get_bits(cap->vht_cap_info,
2025                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2026
2027         /* if not capable, treat ext_nss_bw as 0 */
2028         if (!ext_nss_bw_capable)
2029                 ext_nss_bw = 0;
2030
2031         /* This is invalid */
2032         if (supp_width == 3)
2033                 return 0;
2034
2035         /* This is an invalid combination so pretend nothing is supported */
2036         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2037                 return 0;
2038
2039         /*
2040          * Cover all the special cases according to IEEE 802.11-2016
2041          * Table 9-250. All other cases are either factor of 1 or not
2042          * valid/supported.
2043          */
2044         switch (bw) {
2045         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2046         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2047                 if ((supp_width == 1 || supp_width == 2) &&
2048                     ext_nss_bw == 3)
2049                         return 2 * max_vht_nss;
2050                 break;
2051         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2052                 if (supp_width == 0 &&
2053                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2054                         return max_vht_nss / 2;
2055                 if (supp_width == 0 &&
2056                     ext_nss_bw == 3)
2057                         return (3 * max_vht_nss) / 4;
2058                 if (supp_width == 1 &&
2059                     ext_nss_bw == 3)
2060                         return 2 * max_vht_nss;
2061                 break;
2062         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2063                 if (supp_width == 0 && ext_nss_bw == 1)
2064                         return 0; /* not possible */
2065                 if (supp_width == 0 &&
2066                     ext_nss_bw == 2)
2067                         return max_vht_nss / 2;
2068                 if (supp_width == 0 &&
2069                     ext_nss_bw == 3)
2070                         return (3 * max_vht_nss) / 4;
2071                 if (supp_width == 1 &&
2072                     ext_nss_bw == 0)
2073                         return 0; /* not possible */
2074                 if (supp_width == 1 &&
2075                     ext_nss_bw == 1)
2076                         return max_vht_nss / 2;
2077                 if (supp_width == 1 &&
2078                     ext_nss_bw == 2)
2079                         return (3 * max_vht_nss) / 4;
2080                 break;
2081         }
2082
2083         /* not covered or invalid combination received */
2084         return max_vht_nss;
2085 }
2086 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2087
2088 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2089                              bool is_4addr, u8 check_swif)
2090
2091 {
2092         bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2093
2094         switch (check_swif) {
2095         case 0:
2096                 if (is_vlan && is_4addr)
2097                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2098                 return wiphy->interface_modes & BIT(iftype);
2099         case 1:
2100                 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2101                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2102                 return wiphy->software_iftypes & BIT(iftype);
2103         default:
2104                 break;
2105         }
2106
2107         return false;
2108 }
2109 EXPORT_SYMBOL(cfg80211_iftype_allowed);