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 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 "core.h"
  23 #include "rdev-ops.h"
  24
  25
  26 struct ieee80211_rate *
  27 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  28                             u32 basic_rates, int bitrate)
  29 {
  30         struct ieee80211_rate *result = &sband->bitrates[0];
  31         int i;
  32
  33         for (i = 0; i < sband->n_bitrates; i++) {
  34                 if (!(basic_rates & BIT(i)))
  35                         continue;
  36                 if (sband->bitrates[i].bitrate > bitrate)
  37                         continue;
  38                 result = &sband->bitrates[i];
  39         }
  40
  41         return result;
  42 }
  43 EXPORT_SYMBOL(ieee80211_get_response_rate);
  44
  45 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  46                               enum nl80211_bss_scan_width scan_width)
  47 {
  48         struct ieee80211_rate *bitrates;
  49         u32 mandatory_rates = 0;
  50         enum ieee80211_rate_flags mandatory_flag;
  51         int i;
  52
  53         if (WARN_ON(!sband))
  54                 return 1;
  55
  56         if (sband->band == NL80211_BAND_2GHZ) {
  57                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  58                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  59                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  60                 else
  61                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  62         } else {
  63                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  64         }
  65
  66         bitrates = sband->bitrates;
  67         for (i = 0; i < sband->n_bitrates; i++)
  68                 if (bitrates[i].flags & mandatory_flag)
  69                         mandatory_rates |= BIT(i);
  70         return mandatory_rates;
  71 }
  72 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  73
  74 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  75 {
  76         /* see 802.11 17.3.8.3.2 and Annex J
  77          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  78         if (chan <= 0)
  79                 return 0; /* not supported */
  80         switch (band) {
  81         case NL80211_BAND_2GHZ:
  82                 if (chan == 14)
  83                         return 2484;
  84                 else if (chan < 14)
  85                         return 2407 + chan * 5;
  86                 break;
  87         case NL80211_BAND_5GHZ:
  88                 if (chan >= 182 && chan <= 196)
  89                         return 4000 + chan * 5;
  90                 else
  91                         return 5000 + chan * 5;
  92                 break;
  93         case NL80211_BAND_60GHZ:
  94                 if (chan < 7)
  95                         return 56160 + chan * 2160;
  96                 break;
  97         default:
  98                 ;
  99         }
 100         return 0; /* not supported */
 101 }
 102 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 103
 104 int ieee80211_frequency_to_channel(int freq)
 105 {
 106         /* see 802.11 17.3.8.3.2 and Annex J */
 107         if (freq == 2484)
 108                 return 14;
 109         else if (freq < 2484)
 110                 return (freq - 2407) / 5;
 111         else if (freq >= 4910 && freq <= 4980)
 112                 return (freq - 4000) / 5;
 113         else if (freq <= 45000) /* DMG band lower limit */
 114                 return (freq - 5000) / 5;
 115         else if (freq >= 58320 && freq <= 70200)
 116                 return (freq - 56160) / 2160;
 117         else
 118                 return 0;
 119 }
 120 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 121
 122 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
 123 {
 124         enum nl80211_band band;
 125         struct ieee80211_supported_band *sband;
 126         int i;
 127
 128         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 129                 sband = wiphy->bands[band];
 130
 131                 if (!sband)
 132                         continue;
 133
 134                 for (i = 0; i < sband->n_channels; i++) {
 135                         if (sband->channels[i].center_freq == freq)
 136                                 return &sband->channels[i];
 137                 }
 138         }
 139
 140         return NULL;
 141 }
 142 EXPORT_SYMBOL(ieee80211_get_channel);
 143
 144 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 145 {
 146         int i, want;
 147
 148         switch (sband->band) {
 149         case NL80211_BAND_5GHZ:
 150                 want = 3;
 151                 for (i = 0; i < sband->n_bitrates; i++) {
 152                         if (sband->bitrates[i].bitrate == 60 ||
 153                             sband->bitrates[i].bitrate == 120 ||
 154                             sband->bitrates[i].bitrate == 240) {
 155                                 sband->bitrates[i].flags |=
 156                                         IEEE80211_RATE_MANDATORY_A;
 157                                 want--;
 158                         }
 159                 }
 160                 WARN_ON(want);
 161                 break;
 162         case NL80211_BAND_2GHZ:
 163                 want = 7;
 164                 for (i = 0; i < sband->n_bitrates; i++) {
 165                         switch (sband->bitrates[i].bitrate) {
 166                         case 10:
 167                         case 20:
 168                         case 55:
 169                         case 110:
 170                                 sband->bitrates[i].flags |=
 171                                         IEEE80211_RATE_MANDATORY_B |
 172                                         IEEE80211_RATE_MANDATORY_G;
 173                                 want--;
 174                                 break;
 175                         case 60:
 176                         case 120:
 177                         case 240:
 178                                 sband->bitrates[i].flags |=
 179                                         IEEE80211_RATE_MANDATORY_G;
 180                                 want--;
 181                                 /* fall through */
 182                         default:
 183                                 sband->bitrates[i].flags |=
 184                                         IEEE80211_RATE_ERP_G;
 185                                 break;
 186                         }
 187                 }
 188                 WARN_ON(want != 0 && want != 3);
 189                 break;
 190         case NL80211_BAND_60GHZ:
 191                 /* check for mandatory HT MCS 1..4 */
 192                 WARN_ON(!sband->ht_cap.ht_supported);
 193                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 194                 break;
 195         case NUM_NL80211_BANDS:
 196         default:
 197                 WARN_ON(1);
 198                 break;
 199         }
 200 }
 201
 202 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 203 {
 204         enum nl80211_band band;
 205
 206         for (band = 0; band < NUM_NL80211_BANDS; band++)
 207                 if (wiphy->bands[band])
 208                         set_mandatory_flags_band(wiphy->bands[band]);
 209 }
 210
 211 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 212 {
 213         int i;
 214         for (i = 0; i < wiphy->n_cipher_suites; i++)
 215                 if (cipher == wiphy->cipher_suites[i])
 216                         return true;
 217         return false;
 218 }
 219
 220 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 221                                    struct key_params *params, int key_idx,
 222                                    bool pairwise, const u8 *mac_addr)
 223 {
 224         if (key_idx < 0 || key_idx > 5)
 225                 return -EINVAL;
 226
 227         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 228                 return -EINVAL;
 229
 230         if (pairwise && !mac_addr)
 231                 return -EINVAL;
 232
 233         switch (params->cipher) {
 234         case WLAN_CIPHER_SUITE_TKIP:
 235         case WLAN_CIPHER_SUITE_CCMP:
 236         case WLAN_CIPHER_SUITE_CCMP_256:
 237         case WLAN_CIPHER_SUITE_GCMP:
 238         case WLAN_CIPHER_SUITE_GCMP_256:
 239                 /* Disallow pairwise keys with non-zero index unless it's WEP
 240                  * or a vendor specific cipher (because current deployments use
 241                  * pairwise WEP keys with non-zero indices and for vendor
 242                  * specific ciphers this should be validated in the driver or
 243                  * hardware level - but 802.11i clearly specifies to use zero)
 244                  */
 245                 if (pairwise && key_idx)
 246                         return -EINVAL;
 247                 break;
 248         case WLAN_CIPHER_SUITE_AES_CMAC:
 249         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 250         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 251         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 252                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 253                 if (pairwise)
 254                         return -EINVAL;
 255                 if (key_idx < 4)
 256                         return -EINVAL;
 257                 break;
 258         case WLAN_CIPHER_SUITE_WEP40:
 259         case WLAN_CIPHER_SUITE_WEP104:
 260                 if (key_idx > 3)
 261                         return -EINVAL;
 262         default:
 263                 break;
 264         }
 265
 266         switch (params->cipher) {
 267         case WLAN_CIPHER_SUITE_WEP40:
 268                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 269                         return -EINVAL;
 270                 break;
 271         case WLAN_CIPHER_SUITE_TKIP:
 272                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 273                         return -EINVAL;
 274                 break;
 275         case WLAN_CIPHER_SUITE_CCMP:
 276                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 277                         return -EINVAL;
 278                 break;
 279         case WLAN_CIPHER_SUITE_CCMP_256:
 280                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 281                         return -EINVAL;
 282                 break;
 283         case WLAN_CIPHER_SUITE_GCMP:
 284                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 285                         return -EINVAL;
 286                 break;
 287         case WLAN_CIPHER_SUITE_GCMP_256:
 288                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 289                         return -EINVAL;
 290                 break;
 291         case WLAN_CIPHER_SUITE_WEP104:
 292                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 293                         return -EINVAL;
 294                 break;
 295         case WLAN_CIPHER_SUITE_AES_CMAC:
 296                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 297                         return -EINVAL;
 298                 break;
 299         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 300                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 301                         return -EINVAL;
 302                 break;
 303         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 304                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 305                         return -EINVAL;
 306                 break;
 307         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 308                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 309                         return -EINVAL;
 310                 break;
 311         default:
 312                 /*
 313                  * We don't know anything about this algorithm,
 314                  * allow using it -- but the driver must check
 315                  * all parameters! We still check below whether
 316                  * or not the driver supports this algorithm,
 317                  * of course.
 318                  */
 319                 break;
 320         }
 321
 322         if (params->seq) {
 323                 switch (params->cipher) {
 324                 case WLAN_CIPHER_SUITE_WEP40:
 325                 case WLAN_CIPHER_SUITE_WEP104:
 326                         /* These ciphers do not use key sequence */
 327                         return -EINVAL;
 328                 case WLAN_CIPHER_SUITE_TKIP:
 329                 case WLAN_CIPHER_SUITE_CCMP:
 330                 case WLAN_CIPHER_SUITE_CCMP_256:
 331                 case WLAN_CIPHER_SUITE_GCMP:
 332                 case WLAN_CIPHER_SUITE_GCMP_256:
 333                 case WLAN_CIPHER_SUITE_AES_CMAC:
 334                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 335                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 336                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 337                         if (params->seq_len != 6)
 338                                 return -EINVAL;
 339                         break;
 340                 }
 341         }
 342
 343         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 344                 return -EINVAL;
 345
 346         return 0;
 347 }
 348
 349 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 350 {
 351         unsigned int hdrlen = 24;
 352
 353         if (ieee80211_is_data(fc)) {
 354                 if (ieee80211_has_a4(fc))
 355                         hdrlen = 30;
 356                 if (ieee80211_is_data_qos(fc)) {
 357                         hdrlen += IEEE80211_QOS_CTL_LEN;
 358                         if (ieee80211_has_order(fc))
 359                                 hdrlen += IEEE80211_HT_CTL_LEN;
 360                 }
 361                 goto out;
 362         }
 363
 364         if (ieee80211_is_mgmt(fc)) {
 365                 if (ieee80211_has_order(fc))
 366                         hdrlen += IEEE80211_HT_CTL_LEN;
 367                 goto out;
 368         }
 369
 370         if (ieee80211_is_ctl(fc)) {
 371                 /*
 372                  * ACK and CTS are 10 bytes, all others 16. To see how
 373                  * to get this condition consider
 374                  *   subtype mask:   0b0000000011110000 (0x00F0)
 375                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 376                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 377                  *   bits that matter:         ^^^      (0x00E0)
 378                  *   value of those: 0b0000000011000000 (0x00C0)
 379                  */
 380                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 381                         hdrlen = 10;
 382                 else
 383                         hdrlen = 16;
 384         }
 385 out:
 386         return hdrlen;
 387 }
 388 EXPORT_SYMBOL(ieee80211_hdrlen);
 389
 390 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 391 {
 392         const struct ieee80211_hdr *hdr =
 393                         (const struct ieee80211_hdr *)skb->data;
 394         unsigned int hdrlen;
 395
 396         if (unlikely(skb->len < 10))
 397                 return 0;
 398         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 399         if (unlikely(hdrlen > skb->len))
 400                 return 0;
 401         return hdrlen;
 402 }
 403 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 404
 405 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 406 {
 407         int ae = flags & MESH_FLAGS_AE;
 408         /* 802.11-2012, 8.2.4.7.3 */
 409         switch (ae) {
 410         default:
 411         case 0:
 412                 return 6;
 413         case MESH_FLAGS_AE_A4:
 414                 return 12;
 415         case MESH_FLAGS_AE_A5_A6:
 416                 return 18;
 417         }
 418 }
 419
 420 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 421 {
 422         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 423 }
 424 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 425
 426 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 427                                   const u8 *addr, enum nl80211_iftype iftype,
 428                                   u8 data_offset)
 429 {
 430         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 431         struct {
 432                 u8 hdr[ETH_ALEN] __aligned(2);
 433                 __be16 proto;
 434         } payload;
 435         struct ethhdr tmp;
 436         u16 hdrlen;
 437         u8 mesh_flags = 0;
 438
 439         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 440                 return -1;
 441
 442         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 443         if (skb->len < hdrlen + 8)
 444                 return -1;
 445
 446         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 447          * header
 448          * IEEE 802.11 address fields:
 449          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 450          *   0     0   DA    SA    BSSID n/a
 451          *   0     1   DA    BSSID SA    n/a
 452          *   1     0   BSSID SA    DA    n/a
 453          *   1     1   RA    TA    DA    SA
 454          */
 455         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 456         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 457
 458         if (iftype == NL80211_IFTYPE_MESH_POINT)
 459                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 460
 461         mesh_flags &= MESH_FLAGS_AE;
 462
 463         switch (hdr->frame_control &
 464                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 465         case cpu_to_le16(IEEE80211_FCTL_TODS):
 466                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 467                              iftype != NL80211_IFTYPE_AP_VLAN &&
 468                              iftype != NL80211_IFTYPE_P2P_GO))
 469                         return -1;
 470                 break;
 471         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 472                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 473                              iftype != NL80211_IFTYPE_MESH_POINT &&
 474                              iftype != NL80211_IFTYPE_AP_VLAN &&
 475                              iftype != NL80211_IFTYPE_STATION))
 476                         return -1;
 477                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 478                         if (mesh_flags == MESH_FLAGS_AE_A4)
 479                                 return -1;
 480                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 481                                 skb_copy_bits(skb, hdrlen +
 482                                         offsetof(struct ieee80211s_hdr, eaddr1),
 483                                         tmp.h_dest, 2 * ETH_ALEN);
 484                         }
 485                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 486                 }
 487                 break;
 488         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 489                 if ((iftype != NL80211_IFTYPE_STATION &&
 490                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 491                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 492                     (is_multicast_ether_addr(tmp.h_dest) &&
 493                      ether_addr_equal(tmp.h_source, addr)))
 494                         return -1;
 495                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 496                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 497                                 return -1;
 498                         if (mesh_flags == MESH_FLAGS_AE_A4)
 499                                 skb_copy_bits(skb, hdrlen +
 500                                         offsetof(struct ieee80211s_hdr, eaddr1),
 501                                         tmp.h_source, ETH_ALEN);
 502                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 503                 }
 504                 break;
 505         case cpu_to_le16(0):
 506                 if (iftype != NL80211_IFTYPE_ADHOC &&
 507                     iftype != NL80211_IFTYPE_STATION &&
 508                     iftype != NL80211_IFTYPE_OCB)
 509                                 return -1;
 510                 break;
 511         }
 512
 513         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 514         tmp.h_proto = payload.proto;
 515
 516         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 517                     tmp.h_proto != htons(ETH_P_AARP) &&
 518                     tmp.h_proto != htons(ETH_P_IPX)) ||
 519                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 520                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 521                  * replace EtherType */
 522                 hdrlen += ETH_ALEN + 2;
 523         else
 524                 tmp.h_proto = htons(skb->len - hdrlen);
 525
 526         pskb_pull(skb, hdrlen);
 527
 528         if (!ehdr)
 529                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 530         memcpy(ehdr, &tmp, sizeof(tmp));
 531
 532         return 0;
 533 }
 534 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 535
 536 static void
 537 __frame_add_frag(struct sk_buff *skb, struct page *page,
 538                  void *ptr, int len, int size)
 539 {
 540         struct skb_shared_info *sh = skb_shinfo(skb);
 541         int page_offset;
 542
 543         page_ref_inc(page);
 544         page_offset = ptr - page_address(page);
 545         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 546 }
 547
 548 static void
 549 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 550                             int offset, int len)
 551 {
 552         struct skb_shared_info *sh = skb_shinfo(skb);
 553         const skb_frag_t *frag = &sh->frags[0];
 554         struct page *frag_page;
 555         void *frag_ptr;
 556         int frag_len, frag_size;
 557         int head_size = skb->len - skb->data_len;
 558         int cur_len;
 559
 560         frag_page = virt_to_head_page(skb->head);
 561         frag_ptr = skb->data;
 562         frag_size = head_size;
 563
 564         while (offset >= frag_size) {
 565                 offset -= frag_size;
 566                 frag_page = skb_frag_page(frag);
 567                 frag_ptr = skb_frag_address(frag);
 568                 frag_size = skb_frag_size(frag);
 569                 frag++;
 570         }
 571
 572         frag_ptr += offset;
 573         frag_len = frag_size - offset;
 574
 575         cur_len = min(len, frag_len);
 576
 577         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 578         len -= cur_len;
 579
 580         while (len > 0) {
 581                 frag_len = skb_frag_size(frag);
 582                 cur_len = min(len, frag_len);
 583                 __frame_add_frag(frame, skb_frag_page(frag),
 584                                  skb_frag_address(frag), cur_len, frag_len);
 585                 len -= cur_len;
 586                 frag++;
 587         }
 588 }
 589
 590 static struct sk_buff *
 591 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 592                        int offset, int len, bool reuse_frag)
 593 {
 594         struct sk_buff *frame;
 595         int cur_len = len;
 596
 597         if (skb->len - offset < len)
 598                 return NULL;
 599
 600         /*
 601          * When reusing framents, copy some data to the head to simplify
 602          * ethernet header handling and speed up protocol header processing
 603          * in the stack later.
 604          */
 605         if (reuse_frag)
 606                 cur_len = min_t(int, len, 32);
 607
 608         /*
 609          * Allocate and reserve two bytes more for payload
 610          * alignment since sizeof(struct ethhdr) is 14.
 611          */
 612         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 613         if (!frame)
 614                 return NULL;
 615
 616         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 617         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 618
 619         len -= cur_len;
 620         if (!len)
 621                 return frame;
 622
 623         offset += cur_len;
 624         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 625
 626         return frame;
 627 }
 628
 629 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 630                               const u8 *addr, enum nl80211_iftype iftype,
 631                               const unsigned int extra_headroom,
 632                               const u8 *check_da, const u8 *check_sa)
 633 {
 634         unsigned int hlen = ALIGN(extra_headroom, 4);
 635         struct sk_buff *frame = NULL;
 636         u16 ethertype;
 637         u8 *payload;
 638         int offset = 0, remaining;
 639         struct ethhdr eth;
 640         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 641         bool reuse_skb = false;
 642         bool last = false;
 643
 644         while (!last) {
 645                 unsigned int subframe_len;
 646                 int len;
 647                 u8 padding;
 648
 649                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 650                 len = ntohs(eth.h_proto);
 651                 subframe_len = sizeof(struct ethhdr) + len;
 652                 padding = (4 - subframe_len) & 0x3;
 653
 654                 /* the last MSDU has no padding */
 655                 remaining = skb->len - offset;
 656                 if (subframe_len > remaining)
 657                         goto purge;
 658
 659                 offset += sizeof(struct ethhdr);
 660                 last = remaining <= subframe_len + padding;
 661
 662                 /* FIXME: should we really accept multicast DA? */
 663                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 664                      !ether_addr_equal(check_da, eth.h_dest)) ||
 665                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 666                         offset += len + padding;
 667                         continue;
 668                 }
 669
 670                 /* reuse skb for the last subframe */
 671                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 672                         skb_pull(skb, offset);
 673                         frame = skb;
 674                         reuse_skb = true;
 675                 } else {
 676                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 677                                                        reuse_frag);
 678                         if (!frame)
 679                                 goto purge;
 680
 681                         offset += len + padding;
 682                 }
 683
 684                 skb_reset_network_header(frame);
 685                 frame->dev = skb->dev;
 686                 frame->priority = skb->priority;
 687
 688                 payload = frame->data;
 689                 ethertype = (payload[6] << 8) | payload[7];
 690                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 691                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 692                            ether_addr_equal(payload, bridge_tunnel_header))) {
 693                         eth.h_proto = htons(ethertype);
 694                         skb_pull(frame, ETH_ALEN + 2);
 695                 }
 696
 697                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 698                 __skb_queue_tail(list, frame);
 699         }
 700
 701         if (!reuse_skb)
 702                 dev_kfree_skb(skb);
 703
 704         return;
 705
 706  purge:
 707         __skb_queue_purge(list);
 708         dev_kfree_skb(skb);
 709 }
 710 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 711
 712 /* Given a data frame determine the 802.1p/1d tag to use. */
 713 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 714                                     struct cfg80211_qos_map *qos_map)
 715 {
 716         unsigned int dscp;
 717         unsigned char vlan_priority;
 718
 719         /* skb->priority values from 256->263 are magic values to
 720          * directly indicate a specific 802.1d priority.  This is used
 721          * to allow 802.1d priority to be passed directly in from VLAN
 722          * tags, etc.
 723          */
 724         if (skb->priority >= 256 && skb->priority <= 263)
 725                 return skb->priority - 256;
 726
 727         if (skb_vlan_tag_present(skb)) {
 728                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 729                         >> VLAN_PRIO_SHIFT;
 730                 if (vlan_priority > 0)
 731                         return vlan_priority;
 732         }
 733
 734         switch (skb->protocol) {
 735         case htons(ETH_P_IP):
 736                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 737                 break;
 738         case htons(ETH_P_IPV6):
 739                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 740                 break;
 741         case htons(ETH_P_MPLS_UC):
 742         case htons(ETH_P_MPLS_MC): {
 743                 struct mpls_label mpls_tmp, *mpls;
 744
 745                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 746                                           sizeof(*mpls), &mpls_tmp);
 747                 if (!mpls)
 748                         return 0;
 749
 750                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 751                         >> MPLS_LS_TC_SHIFT;
 752         }
 753         case htons(ETH_P_80221):
 754                 /* 802.21 is always network control traffic */
 755                 return 7;
 756         default:
 757                 return 0;
 758         }
 759
 760         if (qos_map) {
 761                 unsigned int i, tmp_dscp = dscp >> 2;
 762
 763                 for (i = 0; i < qos_map->num_des; i++) {
 764                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 765                                 return qos_map->dscp_exception[i].up;
 766                 }
 767
 768                 for (i = 0; i < 8; i++) {
 769                         if (tmp_dscp >= qos_map->up[i].low &&
 770                             tmp_dscp <= qos_map->up[i].high)
 771                                 return i;
 772                 }
 773         }
 774
 775         return dscp >> 5;
 776 }
 777 EXPORT_SYMBOL(cfg80211_classify8021d);
 778
 779 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 780 {
 781         const struct cfg80211_bss_ies *ies;
 782
 783         ies = rcu_dereference(bss->ies);
 784         if (!ies)
 785                 return NULL;
 786
 787         return cfg80211_find_ie(ie, ies->data, ies->len);
 788 }
 789 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 790
 791 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 792 {
 793         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 794         struct net_device *dev = wdev->netdev;
 795         int i;
 796
 797         if (!wdev->connect_keys)
 798                 return;
 799
 800         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 801                 if (!wdev->connect_keys->params[i].cipher)
 802                         continue;
 803                 if (rdev_add_key(rdev, dev, i, false, NULL,
 804                                  &wdev->connect_keys->params[i])) {
 805                         netdev_err(dev, "failed to set key %d\n", i);
 806                         continue;
 807                 }
 808                 if (wdev->connect_keys->def == i &&
 809                     rdev_set_default_key(rdev, dev, i, true, true)) {
 810                         netdev_err(dev, "failed to set defkey %d\n", i);
 811                         continue;
 812                 }
 813         }
 814
 815         kzfree(wdev->connect_keys);
 816         wdev->connect_keys = NULL;
 817 }
 818
 819 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 820 {
 821         struct cfg80211_event *ev;
 822         unsigned long flags;
 823
 824         spin_lock_irqsave(&wdev->event_lock, flags);
 825         while (!list_empty(&wdev->event_list)) {
 826                 ev = list_first_entry(&wdev->event_list,
 827                                       struct cfg80211_event, list);
 828                 list_del(&ev->list);
 829                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 830
 831                 wdev_lock(wdev);
 832                 switch (ev->type) {
 833                 case EVENT_CONNECT_RESULT:
 834                         __cfg80211_connect_result(
 835                                 wdev->netdev,
 836                                 &ev->cr,
 837                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 838                         break;
 839                 case EVENT_ROAMED:
 840                         __cfg80211_roamed(wdev, &ev->rm);
 841                         break;
 842                 case EVENT_DISCONNECTED:
 843                         __cfg80211_disconnected(wdev->netdev,
 844                                                 ev->dc.ie, ev->dc.ie_len,
 845                                                 ev->dc.reason,
 846                                                 !ev->dc.locally_generated);
 847                         break;
 848                 case EVENT_IBSS_JOINED:
 849                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 850                                                ev->ij.channel);
 851                         break;
 852                 case EVENT_STOPPED:
 853                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 854                         break;
 855                 case EVENT_PORT_AUTHORIZED:
 856                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 857                         break;
 858                 }
 859                 wdev_unlock(wdev);
 860
 861                 kfree(ev);
 862
 863                 spin_lock_irqsave(&wdev->event_lock, flags);
 864         }
 865         spin_unlock_irqrestore(&wdev->event_lock, flags);
 866 }
 867
 868 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 869 {
 870         struct wireless_dev *wdev;
 871
 872         ASSERT_RTNL();
 873
 874         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 875                 cfg80211_process_wdev_events(wdev);
 876 }
 877
 878 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 879                           struct net_device *dev, enum nl80211_iftype ntype,
 880                           struct vif_params *params)
 881 {
 882         int err;
 883         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 884
 885         ASSERT_RTNL();
 886
 887         /* don't support changing VLANs, you just re-create them */
 888         if (otype == NL80211_IFTYPE_AP_VLAN)
 889                 return -EOPNOTSUPP;
 890
 891         /* cannot change into P2P device or NAN */
 892         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 893             ntype == NL80211_IFTYPE_NAN)
 894                 return -EOPNOTSUPP;
 895
 896         if (!rdev->ops->change_virtual_intf ||
 897             !(rdev->wiphy.interface_modes & (1 << ntype)))
 898                 return -EOPNOTSUPP;
 899
 900         /* if it's part of a bridge, reject changing type to station/ibss */
 901         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 902             (ntype == NL80211_IFTYPE_ADHOC ||
 903              ntype == NL80211_IFTYPE_STATION ||
 904              ntype == NL80211_IFTYPE_P2P_CLIENT))
 905                 return -EBUSY;
 906
 907         if (ntype != otype) {
 908                 dev->ieee80211_ptr->use_4addr = false;
 909                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 910                 wdev_lock(dev->ieee80211_ptr);
 911                 rdev_set_qos_map(rdev, dev, NULL);
 912                 wdev_unlock(dev->ieee80211_ptr);
 913
 914                 switch (otype) {
 915                 case NL80211_IFTYPE_AP:
 916                         cfg80211_stop_ap(rdev, dev, true);
 917                         break;
 918                 case NL80211_IFTYPE_ADHOC:
 919                         cfg80211_leave_ibss(rdev, dev, false);
 920                         break;
 921                 case NL80211_IFTYPE_STATION:
 922                 case NL80211_IFTYPE_P2P_CLIENT:
 923                         wdev_lock(dev->ieee80211_ptr);
 924                         cfg80211_disconnect(rdev, dev,
 925                                             WLAN_REASON_DEAUTH_LEAVING, true);
 926                         wdev_unlock(dev->ieee80211_ptr);
 927                         break;
 928                 case NL80211_IFTYPE_MESH_POINT:
 929                         /* mesh should be handled? */
 930                         break;
 931                 default:
 932                         break;
 933                 }
 934
 935                 cfg80211_process_rdev_events(rdev);
 936         }
 937
 938         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 939
 940         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 941
 942         if (!err && params && params->use_4addr != -1)
 943                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 944
 945         if (!err) {
 946                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 947                 switch (ntype) {
 948                 case NL80211_IFTYPE_STATION:
 949                         if (dev->ieee80211_ptr->use_4addr)
 950                                 break;
 951                         /* fall through */
 952                 case NL80211_IFTYPE_OCB:
 953                 case NL80211_IFTYPE_P2P_CLIENT:
 954                 case NL80211_IFTYPE_ADHOC:
 955                         dev->priv_flags |= IFF_DONT_BRIDGE;
 956                         break;
 957                 case NL80211_IFTYPE_P2P_GO:
 958                 case NL80211_IFTYPE_AP:
 959                 case NL80211_IFTYPE_AP_VLAN:
 960                 case NL80211_IFTYPE_WDS:
 961                 case NL80211_IFTYPE_MESH_POINT:
 962                         /* bridging OK */
 963                         break;
 964                 case NL80211_IFTYPE_MONITOR:
 965                         /* monitor can't bridge anyway */
 966                         break;
 967                 case NL80211_IFTYPE_UNSPECIFIED:
 968                 case NUM_NL80211_IFTYPES:
 969                         /* not happening */
 970                         break;
 971                 case NL80211_IFTYPE_P2P_DEVICE:
 972                 case NL80211_IFTYPE_NAN:
 973                         WARN_ON(1);
 974                         break;
 975                 }
 976         }
 977
 978         if (!err && ntype != otype && netif_running(dev)) {
 979                 cfg80211_update_iface_num(rdev, ntype, 1);
 980                 cfg80211_update_iface_num(rdev, otype, -1);
 981         }
 982
 983         return err;
 984 }
 985
 986 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
 987 {
 988         int modulation, streams, bitrate;
 989
 990         /* the formula below does only work for MCS values smaller than 32 */
 991         if (WARN_ON_ONCE(rate->mcs >= 32))
 992                 return 0;
 993
 994         modulation = rate->mcs & 7;
 995         streams = (rate->mcs >> 3) + 1;
 996
 997         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
 998
 999         if (modulation < 4)
1000                 bitrate *= (modulation + 1);
1001         else if (modulation == 4)
1002                 bitrate *= (modulation + 2);
1003         else
1004                 bitrate *= (modulation + 3);
1005
1006         bitrate *= streams;
1007
1008         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1009                 bitrate = (bitrate / 9) * 10;
1010
1011         /* do NOT round down here */
1012         return (bitrate + 50000) / 100000;
1013 }
1014
1015 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1016 {
1017         static const u32 __mcs2bitrate[] = {
1018                 /* control PHY */
1019                 [0] =   275,
1020                 /* SC PHY */
1021                 [1] =  3850,
1022                 [2] =  7700,
1023                 [3] =  9625,
1024                 [4] = 11550,
1025                 [5] = 12512, /* 1251.25 mbps */
1026                 [6] = 15400,
1027                 [7] = 19250,
1028                 [8] = 23100,
1029                 [9] = 25025,
1030                 [10] = 30800,
1031                 [11] = 38500,
1032                 [12] = 46200,
1033                 /* OFDM PHY */
1034                 [13] =  6930,
1035                 [14] =  8662, /* 866.25 mbps */
1036                 [15] = 13860,
1037                 [16] = 17325,
1038                 [17] = 20790,
1039                 [18] = 27720,
1040                 [19] = 34650,
1041                 [20] = 41580,
1042                 [21] = 45045,
1043                 [22] = 51975,
1044                 [23] = 62370,
1045                 [24] = 67568, /* 6756.75 mbps */
1046                 /* LP-SC PHY */
1047                 [25] =  6260,
1048                 [26] =  8340,
1049                 [27] = 11120,
1050                 [28] = 12510,
1051                 [29] = 16680,
1052                 [30] = 22240,
1053                 [31] = 25030,
1054         };
1055
1056         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1057                 return 0;
1058
1059         return __mcs2bitrate[rate->mcs];
1060 }
1061
1062 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1063 {
1064         static const u32 base[4][10] = {
1065                 {   6500000,
1066                    13000000,
1067                    19500000,
1068                    26000000,
1069                    39000000,
1070                    52000000,
1071                    58500000,
1072                    65000000,
1073                    78000000,
1074                 /* not in the spec, but some devices use this: */
1075                    86500000,
1076                 },
1077                 {  13500000,
1078                    27000000,
1079                    40500000,
1080                    54000000,
1081                    81000000,
1082                   108000000,
1083                   121500000,
1084                   135000000,
1085                   162000000,
1086                   180000000,
1087                 },
1088                 {  29300000,
1089                    58500000,
1090                    87800000,
1091                   117000000,
1092                   175500000,
1093                   234000000,
1094                   263300000,
1095                   292500000,
1096                   351000000,
1097                   390000000,
1098                 },
1099                 {  58500000,
1100                   117000000,
1101                   175500000,
1102                   234000000,
1103                   351000000,
1104                   468000000,
1105                   526500000,
1106                   585000000,
1107                   702000000,
1108                   780000000,
1109                 },
1110         };
1111         u32 bitrate;
1112         int idx;
1113
1114         if (rate->mcs > 9)
1115                 goto warn;
1116
1117         switch (rate->bw) {
1118         case RATE_INFO_BW_160:
1119                 idx = 3;
1120                 break;
1121         case RATE_INFO_BW_80:
1122                 idx = 2;
1123                 break;
1124         case RATE_INFO_BW_40:
1125                 idx = 1;
1126                 break;
1127         case RATE_INFO_BW_5:
1128         case RATE_INFO_BW_10:
1129         default:
1130                 goto warn;
1131         case RATE_INFO_BW_20:
1132                 idx = 0;
1133         }
1134
1135         bitrate = base[idx][rate->mcs];
1136         bitrate *= rate->nss;
1137
1138         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1139                 bitrate = (bitrate / 9) * 10;
1140
1141         /* do NOT round down here */
1142         return (bitrate + 50000) / 100000;
1143  warn:
1144         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1145                   rate->bw, rate->mcs, rate->nss);
1146         return 0;
1147 }
1148
1149 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1150 {
1151 #define SCALE 2048
1152         u16 mcs_divisors[12] = {
1153                 34133, /* 16.666666... */
1154                 17067, /*  8.333333... */
1155                 11378, /*  5.555555... */
1156                  8533, /*  4.166666... */
1157                  5689, /*  2.777777... */
1158                  4267, /*  2.083333... */
1159                  3923, /*  1.851851... */
1160                  3413, /*  1.666666... */
1161                  2844, /*  1.388888... */
1162                  2560, /*  1.250000... */
1163                  2276, /*  1.111111... */
1164                  2048, /*  1.000000... */
1165         };
1166         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1167         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1168         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1169         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1170         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1171         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1172         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1173         u64 tmp;
1174         u32 result;
1175
1176         if (WARN_ON_ONCE(rate->mcs > 11))
1177                 return 0;
1178
1179         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1180                 return 0;
1181         if (WARN_ON_ONCE(rate->he_ru_alloc >
1182                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1183                 return 0;
1184         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1185                 return 0;
1186
1187         if (rate->bw == RATE_INFO_BW_160)
1188                 result = rates_160M[rate->he_gi];
1189         else if (rate->bw == RATE_INFO_BW_80 ||
1190                  (rate->bw == RATE_INFO_BW_HE_RU &&
1191                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1192                 result = rates_969[rate->he_gi];
1193         else if (rate->bw == RATE_INFO_BW_40 ||
1194                  (rate->bw == RATE_INFO_BW_HE_RU &&
1195                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1196                 result = rates_484[rate->he_gi];
1197         else if (rate->bw == RATE_INFO_BW_20 ||
1198                  (rate->bw == RATE_INFO_BW_HE_RU &&
1199                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1200                 result = rates_242[rate->he_gi];
1201         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1202                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1203                 result = rates_106[rate->he_gi];
1204         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1205                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1206                 result = rates_52[rate->he_gi];
1207         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1208                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1209                 result = rates_26[rate->he_gi];
1210         else if (WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1211                       rate->bw, rate->he_ru_alloc))
1212                 return 0;
1213
1214         /* now scale to the appropriate MCS */
1215         tmp = result;
1216         tmp *= SCALE;
1217         do_div(tmp, mcs_divisors[rate->mcs]);
1218         result = tmp;
1219
1220         /* and take NSS, DCM into account */
1221         result = (result * rate->nss) / 8;
1222         if (rate->he_dcm)
1223                 result /= 2;
1224
1225         return result;
1226 }
1227
1228 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1229 {
1230         if (rate->flags & RATE_INFO_FLAGS_MCS)
1231                 return cfg80211_calculate_bitrate_ht(rate);
1232         if (rate->flags & RATE_INFO_FLAGS_60G)
1233                 return cfg80211_calculate_bitrate_60g(rate);
1234         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1235                 return cfg80211_calculate_bitrate_vht(rate);
1236         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1237                 return cfg80211_calculate_bitrate_he(rate);
1238
1239         return rate->legacy;
1240 }
1241 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1242
1243 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1244                           enum ieee80211_p2p_attr_id attr,
1245                           u8 *buf, unsigned int bufsize)
1246 {
1247         u8 *out = buf;
1248         u16 attr_remaining = 0;
1249         bool desired_attr = false;
1250         u16 desired_len = 0;
1251
1252         while (len > 0) {
1253                 unsigned int iedatalen;
1254                 unsigned int copy;
1255                 const u8 *iedata;
1256
1257                 if (len < 2)
1258                         return -EILSEQ;
1259                 iedatalen = ies[1];
1260                 if (iedatalen + 2 > len)
1261                         return -EILSEQ;
1262
1263                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1264                         goto cont;
1265
1266                 if (iedatalen < 4)
1267                         goto cont;
1268
1269                 iedata = ies + 2;
1270
1271                 /* check WFA OUI, P2P subtype */
1272                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1273                     iedata[2] != 0x9a || iedata[3] != 0x09)
1274                         goto cont;
1275
1276                 iedatalen -= 4;
1277                 iedata += 4;
1278
1279                 /* check attribute continuation into this IE */
1280                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1281                 if (copy && desired_attr) {
1282                         desired_len += copy;
1283                         if (out) {
1284                                 memcpy(out, iedata, min(bufsize, copy));
1285                                 out += min(bufsize, copy);
1286                                 bufsize -= min(bufsize, copy);
1287                         }
1288
1289
1290                         if (copy == attr_remaining)
1291                                 return desired_len;
1292                 }
1293
1294                 attr_remaining -= copy;
1295                 if (attr_remaining)
1296                         goto cont;
1297
1298                 iedatalen -= copy;
1299                 iedata += copy;
1300
1301                 while (iedatalen > 0) {
1302                         u16 attr_len;
1303
1304                         /* P2P attribute ID & size must fit */
1305                         if (iedatalen < 3)
1306                                 return -EILSEQ;
1307                         desired_attr = iedata[0] == attr;
1308                         attr_len = get_unaligned_le16(iedata + 1);
1309                         iedatalen -= 3;
1310                         iedata += 3;
1311
1312                         copy = min_t(unsigned int, attr_len, iedatalen);
1313
1314                         if (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                                 if (copy == attr_len)
1323                                         return desired_len;
1324                         }
1325
1326                         iedata += copy;
1327                         iedatalen -= copy;
1328                         attr_remaining = attr_len - copy;
1329                 }
1330
1331  cont:
1332                 len -= ies[1] + 2;
1333                 ies += ies[1] + 2;
1334         }
1335
1336         if (attr_remaining && desired_attr)
1337                 return -EILSEQ;
1338
1339         return -ENOENT;
1340 }
1341 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1342
1343 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1344 {
1345         int i;
1346
1347         /* Make sure array values are legal */
1348         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1349                 return false;
1350
1351         i = 0;
1352         while (i < n_ids) {
1353                 if (ids[i] == WLAN_EID_EXTENSION) {
1354                         if (id_ext && (ids[i + 1] == id))
1355                                 return true;
1356
1357                         i += 2;
1358                         continue;
1359                 }
1360
1361                 if (ids[i] == id && !id_ext)
1362                         return true;
1363
1364                 i++;
1365         }
1366         return false;
1367 }
1368
1369 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1370 {
1371         /* we assume a validly formed IEs buffer */
1372         u8 len = ies[pos + 1];
1373
1374         pos += 2 + len;
1375
1376         /* the IE itself must have 255 bytes for fragments to follow */
1377         if (len < 255)
1378                 return pos;
1379
1380         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1381                 len = ies[pos + 1];
1382                 pos += 2 + len;
1383         }
1384
1385         return pos;
1386 }
1387
1388 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1389                               const u8 *ids, int n_ids,
1390                               const u8 *after_ric, int n_after_ric,
1391                               size_t offset)
1392 {
1393         size_t pos = offset;
1394
1395         while (pos < ielen) {
1396                 u8 ext = 0;
1397
1398                 if (ies[pos] == WLAN_EID_EXTENSION)
1399                         ext = 2;
1400                 if ((pos + ext) >= ielen)
1401                         break;
1402
1403                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1404                                           ies[pos] == WLAN_EID_EXTENSION))
1405                         break;
1406
1407                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1408                         pos = skip_ie(ies, ielen, pos);
1409
1410                         while (pos < ielen) {
1411                                 if (ies[pos] == WLAN_EID_EXTENSION)
1412                                         ext = 2;
1413                                 else
1414                                         ext = 0;
1415
1416                                 if ((pos + ext) >= ielen)
1417                                         break;
1418
1419                                 if (!ieee80211_id_in_list(after_ric,
1420                                                           n_after_ric,
1421                                                           ies[pos + ext],
1422                                                           ext == 2))
1423                                         pos = skip_ie(ies, ielen, pos);
1424                                 else
1425                                         break;
1426                         }
1427                 } else {
1428                         pos = skip_ie(ies, ielen, pos);
1429                 }
1430         }
1431
1432         return pos;
1433 }
1434 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1435
1436 bool ieee80211_operating_class_to_band(u8 operating_class,
1437                                        enum nl80211_band *band)
1438 {
1439         switch (operating_class) {
1440         case 112:
1441         case 115 ... 127:
1442         case 128 ... 130:
1443                 *band = NL80211_BAND_5GHZ;
1444                 return true;
1445         case 81:
1446         case 82:
1447         case 83:
1448         case 84:
1449                 *band = NL80211_BAND_2GHZ;
1450                 return true;
1451         case 180:
1452                 *band = NL80211_BAND_60GHZ;
1453                 return true;
1454         }
1455
1456         return false;
1457 }
1458 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1459
1460 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1461                                           u8 *op_class)
1462 {
1463         u8 vht_opclass;
1464         u32 freq = chandef->center_freq1;
1465
1466         if (freq >= 2412 && freq <= 2472) {
1467                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1468                         return false;
1469
1470                 /* 2.407 GHz, channels 1..13 */
1471                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1472                         if (freq > chandef->chan->center_freq)
1473                                 *op_class = 83; /* HT40+ */
1474                         else
1475                                 *op_class = 84; /* HT40- */
1476                 } else {
1477                         *op_class = 81;
1478                 }
1479
1480                 return true;
1481         }
1482
1483         if (freq == 2484) {
1484                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1485                         return false;
1486
1487                 *op_class = 82; /* channel 14 */
1488                 return true;
1489         }
1490
1491         switch (chandef->width) {
1492         case NL80211_CHAN_WIDTH_80:
1493                 vht_opclass = 128;
1494                 break;
1495         case NL80211_CHAN_WIDTH_160:
1496                 vht_opclass = 129;
1497                 break;
1498         case NL80211_CHAN_WIDTH_80P80:
1499                 vht_opclass = 130;
1500                 break;
1501         case NL80211_CHAN_WIDTH_10:
1502         case NL80211_CHAN_WIDTH_5:
1503                 return false; /* unsupported for now */
1504         default:
1505                 vht_opclass = 0;
1506                 break;
1507         }
1508
1509         /* 5 GHz, channels 36..48 */
1510         if (freq >= 5180 && freq <= 5240) {
1511                 if (vht_opclass) {
1512                         *op_class = vht_opclass;
1513                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1514                         if (freq > chandef->chan->center_freq)
1515                                 *op_class = 116;
1516                         else
1517                                 *op_class = 117;
1518                 } else {
1519                         *op_class = 115;
1520                 }
1521
1522                 return true;
1523         }
1524
1525         /* 5 GHz, channels 52..64 */
1526         if (freq >= 5260 && freq <= 5320) {
1527                 if (vht_opclass) {
1528                         *op_class = vht_opclass;
1529                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1530                         if (freq > chandef->chan->center_freq)
1531                                 *op_class = 119;
1532                         else
1533                                 *op_class = 120;
1534                 } else {
1535                         *op_class = 118;
1536                 }
1537
1538                 return true;
1539         }
1540
1541         /* 5 GHz, channels 100..144 */
1542         if (freq >= 5500 && freq <= 5720) {
1543                 if (vht_opclass) {
1544                         *op_class = vht_opclass;
1545                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1546                         if (freq > chandef->chan->center_freq)
1547                                 *op_class = 122;
1548                         else
1549                                 *op_class = 123;
1550                 } else {
1551                         *op_class = 121;
1552                 }
1553
1554                 return true;
1555         }
1556
1557         /* 5 GHz, channels 149..169 */
1558         if (freq >= 5745 && freq <= 5845) {
1559                 if (vht_opclass) {
1560                         *op_class = vht_opclass;
1561                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1562                         if (freq > chandef->chan->center_freq)
1563                                 *op_class = 126;
1564                         else
1565                                 *op_class = 127;
1566                 } else if (freq <= 5805) {
1567                         *op_class = 124;
1568                 } else {
1569                         *op_class = 125;
1570                 }
1571
1572                 return true;
1573         }
1574
1575         /* 56.16 GHz, channel 1..4 */
1576         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1577                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1578                         return false;
1579
1580                 *op_class = 180;
1581                 return true;
1582         }
1583
1584         /* not supported yet */
1585         return false;
1586 }
1587 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1588
1589 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1590                                        u32 *beacon_int_gcd,
1591                                        bool *beacon_int_different)
1592 {
1593         struct wireless_dev *wdev;
1594
1595         *beacon_int_gcd = 0;
1596         *beacon_int_different = false;
1597
1598         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1599                 if (!wdev->beacon_interval)
1600                         continue;
1601
1602                 if (!*beacon_int_gcd) {
1603                         *beacon_int_gcd = wdev->beacon_interval;
1604                         continue;
1605                 }
1606
1607                 if (wdev->beacon_interval == *beacon_int_gcd)
1608                         continue;
1609
1610                 *beacon_int_different = true;
1611                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1612         }
1613
1614         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1615                 if (*beacon_int_gcd)
1616                         *beacon_int_different = true;
1617                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1618         }
1619 }
1620
1621 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1622                                  enum nl80211_iftype iftype, u32 beacon_int)
1623 {
1624         /*
1625          * This is just a basic pre-condition check; if interface combinations
1626          * are possible the driver must already be checking those with a call
1627          * to cfg80211_check_combinations(), in which case we'll validate more
1628          * through the cfg80211_calculate_bi_data() call and code in
1629          * cfg80211_iter_combinations().
1630          */
1631
1632         if (beacon_int < 10 || beacon_int > 10000)
1633                 return -EINVAL;
1634
1635         return 0;
1636 }
1637
1638 int cfg80211_iter_combinations(struct wiphy *wiphy,
1639                                struct iface_combination_params *params,
1640                                void (*iter)(const struct ieee80211_iface_combination *c,
1641                                             void *data),
1642                                void *data)
1643 {
1644         const struct ieee80211_regdomain *regdom;
1645         enum nl80211_dfs_regions region = 0;
1646         int i, j, iftype;
1647         int num_interfaces = 0;
1648         u32 used_iftypes = 0;
1649         u32 beacon_int_gcd;
1650         bool beacon_int_different;
1651
1652         /*
1653          * This is a bit strange, since the iteration used to rely only on
1654          * the data given by the driver, but here it now relies on context,
1655          * in form of the currently operating interfaces.
1656          * This is OK for all current users, and saves us from having to
1657          * push the GCD calculations into all the drivers.
1658          * In the future, this should probably rely more on data that's in
1659          * cfg80211 already - the only thing not would appear to be any new
1660          * interfaces (while being brought up) and channel/radar data.
1661          */
1662         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1663                                    &beacon_int_gcd, &beacon_int_different);
1664
1665         if (params->radar_detect) {
1666                 rcu_read_lock();
1667                 regdom = rcu_dereference(cfg80211_regdomain);
1668                 if (regdom)
1669                         region = regdom->dfs_region;
1670                 rcu_read_unlock();
1671         }
1672
1673         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1674                 num_interfaces += params->iftype_num[iftype];
1675                 if (params->iftype_num[iftype] > 0 &&
1676                     !(wiphy->software_iftypes & BIT(iftype)))
1677                         used_iftypes |= BIT(iftype);
1678         }
1679
1680         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1681                 const struct ieee80211_iface_combination *c;
1682                 struct ieee80211_iface_limit *limits;
1683                 u32 all_iftypes = 0;
1684
1685                 c = &wiphy->iface_combinations[i];
1686
1687                 if (num_interfaces > c->max_interfaces)
1688                         continue;
1689                 if (params->num_different_channels > c->num_different_channels)
1690                         continue;
1691
1692                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1693                                  GFP_KERNEL);
1694                 if (!limits)
1695                         return -ENOMEM;
1696
1697                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1698                         if (wiphy->software_iftypes & BIT(iftype))
1699                                 continue;
1700                         for (j = 0; j < c->n_limits; j++) {
1701                                 all_iftypes |= limits[j].types;
1702                                 if (!(limits[j].types & BIT(iftype)))
1703                                         continue;
1704                                 if (limits[j].max < params->iftype_num[iftype])
1705                                         goto cont;
1706                                 limits[j].max -= params->iftype_num[iftype];
1707                         }
1708                 }
1709
1710                 if (params->radar_detect !=
1711                         (c->radar_detect_widths & params->radar_detect))
1712                         goto cont;
1713
1714                 if (params->radar_detect && c->radar_detect_regions &&
1715                     !(c->radar_detect_regions & BIT(region)))
1716                         goto cont;
1717
1718                 /* Finally check that all iftypes that we're currently
1719                  * using are actually part of this combination. If they
1720                  * aren't then we can't use this combination and have
1721                  * to continue to the next.
1722                  */
1723                 if ((all_iftypes & used_iftypes) != used_iftypes)
1724                         goto cont;
1725
1726                 if (beacon_int_gcd) {
1727                         if (c->beacon_int_min_gcd &&
1728                             beacon_int_gcd < c->beacon_int_min_gcd)
1729                                 goto cont;
1730                         if (!c->beacon_int_min_gcd && beacon_int_different)
1731                                 goto cont;
1732                 }
1733
1734                 /* This combination covered all interface types and
1735                  * supported the requested numbers, so we're good.
1736                  */
1737
1738                 (*iter)(c, data);
1739  cont:
1740                 kfree(limits);
1741         }
1742
1743         return 0;
1744 }
1745 EXPORT_SYMBOL(cfg80211_iter_combinations);
1746
1747 static void
1748 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1749                           void *data)
1750 {
1751         int *num = data;
1752         (*num)++;
1753 }
1754
1755 int cfg80211_check_combinations(struct wiphy *wiphy,
1756                                 struct iface_combination_params *params)
1757 {
1758         int err, num = 0;
1759
1760         err = cfg80211_iter_combinations(wiphy, params,
1761                                          cfg80211_iter_sum_ifcombs, &num);
1762         if (err)
1763                 return err;
1764         if (num == 0)
1765                 return -EBUSY;
1766
1767         return 0;
1768 }
1769 EXPORT_SYMBOL(cfg80211_check_combinations);
1770
1771 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1772                            const u8 *rates, unsigned int n_rates,
1773                            u32 *mask)
1774 {
1775         int i, j;
1776
1777         if (!sband)
1778                 return -EINVAL;
1779
1780         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1781                 return -EINVAL;
1782
1783         *mask = 0;
1784
1785         for (i = 0; i < n_rates; i++) {
1786                 int rate = (rates[i] & 0x7f) * 5;
1787                 bool found = false;
1788
1789                 for (j = 0; j < sband->n_bitrates; j++) {
1790                         if (sband->bitrates[j].bitrate == rate) {
1791                                 found = true;
1792                                 *mask |= BIT(j);
1793                                 break;
1794                         }
1795                 }
1796                 if (!found)
1797                         return -EINVAL;
1798         }
1799
1800         /*
1801          * mask must have at least one bit set here since we
1802          * didn't accept a 0-length rates array nor allowed
1803          * entries in the array that didn't exist
1804          */
1805
1806         return 0;
1807 }
1808
1809 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1810 {
1811         enum nl80211_band band;
1812         unsigned int n_channels = 0;
1813
1814         for (band = 0; band < NUM_NL80211_BANDS; band++)
1815                 if (wiphy->bands[band])
1816                         n_channels += wiphy->bands[band]->n_channels;
1817
1818         return n_channels;
1819 }
1820 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1821
1822 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1823                          struct station_info *sinfo)
1824 {
1825         struct cfg80211_registered_device *rdev;
1826         struct wireless_dev *wdev;
1827
1828         wdev = dev->ieee80211_ptr;
1829         if (!wdev)
1830                 return -EOPNOTSUPP;
1831
1832         rdev = wiphy_to_rdev(wdev->wiphy);
1833         if (!rdev->ops->get_station)
1834                 return -EOPNOTSUPP;
1835
1836         memset(sinfo, 0, sizeof(*sinfo));
1837
1838         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1839 }
1840 EXPORT_SYMBOL(cfg80211_get_station);
1841
1842 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1843 {
1844         int i;
1845
1846         if (!f)
1847                 return;
1848
1849         kfree(f->serv_spec_info);
1850         kfree(f->srf_bf);
1851         kfree(f->srf_macs);
1852         for (i = 0; i < f->num_rx_filters; i++)
1853                 kfree(f->rx_filters[i].filter);
1854
1855         for (i = 0; i < f->num_tx_filters; i++)
1856                 kfree(f->tx_filters[i].filter);
1857
1858         kfree(f->rx_filters);
1859         kfree(f->tx_filters);
1860         kfree(f);
1861 }
1862 EXPORT_SYMBOL(cfg80211_free_nan_func);
1863
1864 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1865                                 u32 center_freq_khz, u32 bw_khz)
1866 {
1867         u32 start_freq_khz, end_freq_khz;
1868
1869         start_freq_khz = center_freq_khz - (bw_khz / 2);
1870         end_freq_khz = center_freq_khz + (bw_khz / 2);
1871
1872         if (start_freq_khz >= freq_range->start_freq_khz &&
1873             end_freq_khz <= freq_range->end_freq_khz)
1874                 return true;
1875
1876         return false;
1877 }
1878
1879 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1880 {
1881         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1882                                 sizeof(*(sinfo->pertid)),
1883                                 gfp);
1884         if (!sinfo->pertid)
1885                 return -ENOMEM;
1886
1887         return 0;
1888 }
1889 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1890
1891 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1892 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1893 const unsigned char rfc1042_header[] __aligned(2) =
1894         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1895 EXPORT_SYMBOL(rfc1042_header);
1896
1897 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1898 const unsigned char bridge_tunnel_header[] __aligned(2) =
1899         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1900 EXPORT_SYMBOL(bridge_tunnel_header);
1901
1902 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
1903 struct iapp_layer2_update {
1904         u8 da[ETH_ALEN];        /* broadcast */
1905         u8 sa[ETH_ALEN];        /* STA addr */
1906         __be16 len;             /* 6 */
1907         u8 dsap;                /* 0 */
1908         u8 ssap;                /* 0 */
1909         u8 control;
1910         u8 xid_info[3];
1911 } __packed;
1912
1913 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
1914 {
1915         struct iapp_layer2_update *msg;
1916         struct sk_buff *skb;
1917
1918         /* Send Level 2 Update Frame to update forwarding tables in layer 2
1919          * bridge devices */
1920
1921         skb = dev_alloc_skb(sizeof(*msg));
1922         if (!skb)
1923                 return;
1924         msg = skb_put(skb, sizeof(*msg));
1925
1926         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
1927          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
1928
1929         eth_broadcast_addr(msg->da);
1930         ether_addr_copy(msg->sa, addr);
1931         msg->len = htons(6);
1932         msg->dsap = 0;
1933         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
1934         msg->control = 0xaf;    /* XID response lsb.1111F101.
1935                                  * F=0 (no poll command; unsolicited frame) */
1936         msg->xid_info[0] = 0x81;        /* XID format identifier */
1937         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
1938         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
1939
1940         skb->dev = dev;
1941         skb->protocol = eth_type_trans(skb, dev);
1942         memset(skb->cb, 0, sizeof(skb->cb));
1943         netif_rx_ni(skb);
1944 }
1945 EXPORT_SYMBOL(cfg80211_send_layer2_update);
1946
1947 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
1948                               enum ieee80211_vht_chanwidth bw,
1949                               int mcs, bool ext_nss_bw_capable)
1950 {
1951         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
1952         int max_vht_nss = 0;
1953         int ext_nss_bw;
1954         int supp_width;
1955         int i, mcs_encoding;
1956
1957         if (map == 0xffff)
1958                 return 0;
1959
1960         if (WARN_ON(mcs > 9))
1961                 return 0;
1962         if (mcs <= 7)
1963                 mcs_encoding = 0;
1964         else if (mcs == 8)
1965                 mcs_encoding = 1;
1966         else
1967                 mcs_encoding = 2;
1968
1969         /* find max_vht_nss for the given MCS */
1970         for (i = 7; i >= 0; i--) {
1971                 int supp = (map >> (2 * i)) & 3;
1972
1973                 if (supp == 3)
1974                         continue;
1975
1976                 if (supp >= mcs_encoding) {
1977                         max_vht_nss = i;
1978                         break;
1979                 }
1980         }
1981
1982         if (!(cap->supp_mcs.tx_mcs_map &
1983                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
1984                 return max_vht_nss;
1985
1986         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
1987                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
1988         supp_width = le32_get_bits(cap->vht_cap_info,
1989                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
1990
1991         /* if not capable, treat ext_nss_bw as 0 */
1992         if (!ext_nss_bw_capable)
1993                 ext_nss_bw = 0;
1994
1995         /* This is invalid */
1996         if (supp_width == 3)
1997                 return 0;
1998
1999         /* This is an invalid combination so pretend nothing is supported */
2000         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2001                 return 0;
2002
2003         /*
2004          * Cover all the special cases according to IEEE 802.11-2016
2005          * Table 9-250. All other cases are either factor of 1 or not
2006          * valid/supported.
2007          */
2008         switch (bw) {
2009         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2010         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2011                 if ((supp_width == 1 || supp_width == 2) &&
2012                     ext_nss_bw == 3)
2013                         return 2 * max_vht_nss;
2014                 break;
2015         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2016                 if (supp_width == 0 &&
2017                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2018                         return max_vht_nss / 2;
2019                 if (supp_width == 0 &&
2020                     ext_nss_bw == 3)
2021                         return (3 * max_vht_nss) / 4;
2022                 if (supp_width == 1 &&
2023                     ext_nss_bw == 3)
2024                         return 2 * max_vht_nss;
2025                 break;
2026         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2027                 if (supp_width == 0 && ext_nss_bw == 1)
2028                         return 0; /* not possible */
2029                 if (supp_width == 0 &&
2030                     ext_nss_bw == 2)
2031                         return max_vht_nss / 2;
2032                 if (supp_width == 0 &&
2033                     ext_nss_bw == 3)
2034                         return (3 * max_vht_nss) / 4;
2035                 if (supp_width == 1 &&
2036                     ext_nss_bw == 0)
2037                         return 0; /* not possible */
2038                 if (supp_width == 1 &&
2039                     ext_nss_bw == 1)
2040                         return max_vht_nss / 2;
2041                 if (supp_width == 1 &&
2042                     ext_nss_bw == 2)
2043                         return (3 * max_vht_nss) / 4;
2044                 break;
2045         }
2046
2047         /* not covered or invalid combination received */
2048         return max_vht_nss;
2049 }
2050 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);