net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7 #include <linux/export.h>
   8 #include <linux/bitops.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/slab.h>
  11 #include <net/cfg80211.h>
  12 #include <net/ip.h>
  13 #include <net/dsfield.h>
  14 #include <linux/if_vlan.h>
  15 #include <linux/mpls.h>
  16 #include "core.h"
  17 #include "rdev-ops.h"
  18
  19
  20 struct ieee80211_rate *
  21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  22                             u32 basic_rates, int bitrate)
  23 {
  24         struct ieee80211_rate *result = &sband->bitrates[0];
  25         int i;
  26
  27         for (i = 0; i < sband->n_bitrates; i++) {
  28                 if (!(basic_rates & BIT(i)))
  29                         continue;
  30                 if (sband->bitrates[i].bitrate > bitrate)
  31                         continue;
  32                 result = &sband->bitrates[i];
  33         }
  34
  35         return result;
  36 }
  37 EXPORT_SYMBOL(ieee80211_get_response_rate);
  38
  39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  40                               enum nl80211_bss_scan_width scan_width)
  41 {
  42         struct ieee80211_rate *bitrates;
  43         u32 mandatory_rates = 0;
  44         enum ieee80211_rate_flags mandatory_flag;
  45         int i;
  46
  47         if (WARN_ON(!sband))
  48                 return 1;
  49
  50         if (sband->band == NL80211_BAND_2GHZ) {
  51                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  52                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  53                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  54                 else
  55                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  56         } else {
  57                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  58         }
  59
  60         bitrates = sband->bitrates;
  61         for (i = 0; i < sband->n_bitrates; i++)
  62                 if (bitrates[i].flags & mandatory_flag)
  63                         mandatory_rates |= BIT(i);
  64         return mandatory_rates;
  65 }
  66 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  67
  68 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  69 {
  70         /* see 802.11 17.3.8.3.2 and Annex J
  71          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  72         if (chan <= 0)
  73                 return 0; /* not supported */
  74         switch (band) {
  75         case NL80211_BAND_2GHZ:
  76                 if (chan == 14)
  77                         return 2484;
  78                 else if (chan < 14)
  79                         return 2407 + chan * 5;
  80                 break;
  81         case NL80211_BAND_5GHZ:
  82                 if (chan >= 182 && chan <= 196)
  83                         return 4000 + chan * 5;
  84                 else
  85                         return 5000 + chan * 5;
  86                 break;
  87         case NL80211_BAND_60GHZ:
  88                 if (chan < 5)
  89                         return 56160 + chan * 2160;
  90                 break;
  91         default:
  92                 ;
  93         }
  94         return 0; /* not supported */
  95 }
  96 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  97
  98 int ieee80211_frequency_to_channel(int freq)
  99 {
 100         /* see 802.11 17.3.8.3.2 and Annex J */
 101         if (freq == 2484)
 102                 return 14;
 103         else if (freq < 2484)
 104                 return (freq - 2407) / 5;
 105         else if (freq >= 4910 && freq <= 4980)
 106                 return (freq - 4000) / 5;
 107         else if (freq <= 45000) /* DMG band lower limit */
 108                 return (freq - 5000) / 5;
 109         else if (freq >= 58320 && freq <= 64800)
 110                 return (freq - 56160) / 2160;
 111         else
 112                 return 0;
 113 }
 114 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 115
 116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 117                                                   int freq)
 118 {
 119         enum nl80211_band band;
 120         struct ieee80211_supported_band *sband;
 121         int i;
 122
 123         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 124                 sband = wiphy->bands[band];
 125
 126                 if (!sband)
 127                         continue;
 128
 129                 for (i = 0; i < sband->n_channels; i++) {
 130                         if (sband->channels[i].center_freq == freq)
 131                                 return &sband->channels[i];
 132                 }
 133         }
 134
 135         return NULL;
 136 }
 137 EXPORT_SYMBOL(__ieee80211_get_channel);
 138
 139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 140                                      enum nl80211_band band)
 141 {
 142         int i, want;
 143
 144         switch (band) {
 145         case NL80211_BAND_5GHZ:
 146                 want = 3;
 147                 for (i = 0; i < sband->n_bitrates; i++) {
 148                         if (sband->bitrates[i].bitrate == 60 ||
 149                             sband->bitrates[i].bitrate == 120 ||
 150                             sband->bitrates[i].bitrate == 240) {
 151                                 sband->bitrates[i].flags |=
 152                                         IEEE80211_RATE_MANDATORY_A;
 153                                 want--;
 154                         }
 155                 }
 156                 WARN_ON(want);
 157                 break;
 158         case NL80211_BAND_2GHZ:
 159                 want = 7;
 160                 for (i = 0; i < sband->n_bitrates; i++) {
 161                         if (sband->bitrates[i].bitrate == 10) {
 162                                 sband->bitrates[i].flags |=
 163                                         IEEE80211_RATE_MANDATORY_B |
 164                                         IEEE80211_RATE_MANDATORY_G;
 165                                 want--;
 166                         }
 167
 168                         if (sband->bitrates[i].bitrate == 20 ||
 169                             sband->bitrates[i].bitrate == 55 ||
 170                             sband->bitrates[i].bitrate == 110 ||
 171                             sband->bitrates[i].bitrate == 60 ||
 172                             sband->bitrates[i].bitrate == 120 ||
 173                             sband->bitrates[i].bitrate == 240) {
 174                                 sband->bitrates[i].flags |=
 175                                         IEEE80211_RATE_MANDATORY_G;
 176                                 want--;
 177                         }
 178
 179                         if (sband->bitrates[i].bitrate != 10 &&
 180                             sband->bitrates[i].bitrate != 20 &&
 181                             sband->bitrates[i].bitrate != 55 &&
 182                             sband->bitrates[i].bitrate != 110)
 183                                 sband->bitrates[i].flags |=
 184                                         IEEE80211_RATE_ERP_G;
 185                 }
 186                 WARN_ON(want != 0 && want != 3 && want != 6);
 187                 break;
 188         case NL80211_BAND_60GHZ:
 189                 /* check for mandatory HT MCS 1..4 */
 190                 WARN_ON(!sband->ht_cap.ht_supported);
 191                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 192                 break;
 193         case NUM_NL80211_BANDS:
 194                 WARN_ON(1);
 195                 break;
 196         }
 197 }
 198
 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 200 {
 201         enum nl80211_band band;
 202
 203         for (band = 0; band < NUM_NL80211_BANDS; band++)
 204                 if (wiphy->bands[band])
 205                         set_mandatory_flags_band(wiphy->bands[band], band);
 206 }
 207
 208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 209 {
 210         int i;
 211         for (i = 0; i < wiphy->n_cipher_suites; i++)
 212                 if (cipher == wiphy->cipher_suites[i])
 213                         return true;
 214         return false;
 215 }
 216
 217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 218                                    struct key_params *params, int key_idx,
 219                                    bool pairwise, const u8 *mac_addr)
 220 {
 221         if (key_idx < 0 || key_idx > 5)
 222                 return -EINVAL;
 223
 224         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 225                 return -EINVAL;
 226
 227         if (pairwise && !mac_addr)
 228                 return -EINVAL;
 229
 230         switch (params->cipher) {
 231         case WLAN_CIPHER_SUITE_TKIP:
 232         case WLAN_CIPHER_SUITE_CCMP:
 233         case WLAN_CIPHER_SUITE_CCMP_256:
 234         case WLAN_CIPHER_SUITE_GCMP:
 235         case WLAN_CIPHER_SUITE_GCMP_256:
 236                 /* Disallow pairwise keys with non-zero index unless it's WEP
 237                  * or a vendor specific cipher (because current deployments use
 238                  * pairwise WEP keys with non-zero indices and for vendor
 239                  * specific ciphers this should be validated in the driver or
 240                  * hardware level - but 802.11i clearly specifies to use zero)
 241                  */
 242                 if (pairwise && key_idx)
 243                         return -EINVAL;
 244                 break;
 245         case WLAN_CIPHER_SUITE_AES_CMAC:
 246         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 247         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 248         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 249                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 250                 if (pairwise)
 251                         return -EINVAL;
 252                 if (key_idx < 4)
 253                         return -EINVAL;
 254                 break;
 255         case WLAN_CIPHER_SUITE_WEP40:
 256         case WLAN_CIPHER_SUITE_WEP104:
 257                 if (key_idx > 3)
 258                         return -EINVAL;
 259         default:
 260                 break;
 261         }
 262
 263         switch (params->cipher) {
 264         case WLAN_CIPHER_SUITE_WEP40:
 265                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 266                         return -EINVAL;
 267                 break;
 268         case WLAN_CIPHER_SUITE_TKIP:
 269                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 270                         return -EINVAL;
 271                 break;
 272         case WLAN_CIPHER_SUITE_CCMP:
 273                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 274                         return -EINVAL;
 275                 break;
 276         case WLAN_CIPHER_SUITE_CCMP_256:
 277                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 278                         return -EINVAL;
 279                 break;
 280         case WLAN_CIPHER_SUITE_GCMP:
 281                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 282                         return -EINVAL;
 283                 break;
 284         case WLAN_CIPHER_SUITE_GCMP_256:
 285                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 286                         return -EINVAL;
 287                 break;
 288         case WLAN_CIPHER_SUITE_WEP104:
 289                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 290                         return -EINVAL;
 291                 break;
 292         case WLAN_CIPHER_SUITE_AES_CMAC:
 293                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 294                         return -EINVAL;
 295                 break;
 296         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 297                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 298                         return -EINVAL;
 299                 break;
 300         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 301                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 302                         return -EINVAL;
 303                 break;
 304         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 305                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 306                         return -EINVAL;
 307                 break;
 308         default:
 309                 /*
 310                  * We don't know anything about this algorithm,
 311                  * allow using it -- but the driver must check
 312                  * all parameters! We still check below whether
 313                  * or not the driver supports this algorithm,
 314                  * of course.
 315                  */
 316                 break;
 317         }
 318
 319         if (params->seq) {
 320                 switch (params->cipher) {
 321                 case WLAN_CIPHER_SUITE_WEP40:
 322                 case WLAN_CIPHER_SUITE_WEP104:
 323                         /* These ciphers do not use key sequence */
 324                         return -EINVAL;
 325                 case WLAN_CIPHER_SUITE_TKIP:
 326                 case WLAN_CIPHER_SUITE_CCMP:
 327                 case WLAN_CIPHER_SUITE_CCMP_256:
 328                 case WLAN_CIPHER_SUITE_GCMP:
 329                 case WLAN_CIPHER_SUITE_GCMP_256:
 330                 case WLAN_CIPHER_SUITE_AES_CMAC:
 331                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 332                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 333                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 334                         if (params->seq_len != 6)
 335                                 return -EINVAL;
 336                         break;
 337                 }
 338         }
 339
 340         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 341                 return -EINVAL;
 342
 343         return 0;
 344 }
 345
 346 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 347 {
 348         unsigned int hdrlen = 24;
 349
 350         if (ieee80211_is_data(fc)) {
 351                 if (ieee80211_has_a4(fc))
 352                         hdrlen = 30;
 353                 if (ieee80211_is_data_qos(fc)) {
 354                         hdrlen += IEEE80211_QOS_CTL_LEN;
 355                         if (ieee80211_has_order(fc))
 356                                 hdrlen += IEEE80211_HT_CTL_LEN;
 357                 }
 358                 goto out;
 359         }
 360
 361         if (ieee80211_is_mgmt(fc)) {
 362                 if (ieee80211_has_order(fc))
 363                         hdrlen += IEEE80211_HT_CTL_LEN;
 364                 goto out;
 365         }
 366
 367         if (ieee80211_is_ctl(fc)) {
 368                 /*
 369                  * ACK and CTS are 10 bytes, all others 16. To see how
 370                  * to get this condition consider
 371                  *   subtype mask:   0b0000000011110000 (0x00F0)
 372                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 373                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 374                  *   bits that matter:         ^^^      (0x00E0)
 375                  *   value of those: 0b0000000011000000 (0x00C0)
 376                  */
 377                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 378                         hdrlen = 10;
 379                 else
 380                         hdrlen = 16;
 381         }
 382 out:
 383         return hdrlen;
 384 }
 385 EXPORT_SYMBOL(ieee80211_hdrlen);
 386
 387 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 388 {
 389         const struct ieee80211_hdr *hdr =
 390                         (const struct ieee80211_hdr *)skb->data;
 391         unsigned int hdrlen;
 392
 393         if (unlikely(skb->len < 10))
 394                 return 0;
 395         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 396         if (unlikely(hdrlen > skb->len))
 397                 return 0;
 398         return hdrlen;
 399 }
 400 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 401
 402 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 403 {
 404         int ae = flags & MESH_FLAGS_AE;
 405         /* 802.11-2012, 8.2.4.7.3 */
 406         switch (ae) {
 407         default:
 408         case 0:
 409                 return 6;
 410         case MESH_FLAGS_AE_A4:
 411                 return 12;
 412         case MESH_FLAGS_AE_A5_A6:
 413                 return 18;
 414         }
 415 }
 416
 417 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 418 {
 419         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 420 }
 421 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 422
 423 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 424                                   const u8 *addr, enum nl80211_iftype iftype,
 425                                   bool is_amsdu)
 426 {
 427         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 428         struct {
 429                 u8 hdr[ETH_ALEN] __aligned(2);
 430                 __be16 proto;
 431         } payload;
 432         struct ethhdr tmp;
 433         u16 hdrlen;
 434         u8 mesh_flags = 0;
 435
 436         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 437                 return -1;
 438
 439         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 440         if (skb->len < hdrlen + 8)
 441                 return -1;
 442
 443         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 444          * header
 445          * IEEE 802.11 address fields:
 446          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 447          *   0     0   DA    SA    BSSID n/a
 448          *   0     1   DA    BSSID SA    n/a
 449          *   1     0   BSSID SA    DA    n/a
 450          *   1     1   RA    TA    DA    SA
 451          */
 452         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 453         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 454
 455         if (iftype == NL80211_IFTYPE_MESH_POINT)
 456                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 457
 458         mesh_flags &= MESH_FLAGS_AE;
 459
 460         switch (hdr->frame_control &
 461                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 462         case cpu_to_le16(IEEE80211_FCTL_TODS):
 463                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 464                              iftype != NL80211_IFTYPE_AP_VLAN &&
 465                              iftype != NL80211_IFTYPE_P2P_GO))
 466                         return -1;
 467                 break;
 468         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 469                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 470                              iftype != NL80211_IFTYPE_MESH_POINT &&
 471                              iftype != NL80211_IFTYPE_AP_VLAN &&
 472                              iftype != NL80211_IFTYPE_STATION))
 473                         return -1;
 474                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 475                         if (mesh_flags == MESH_FLAGS_AE_A4)
 476                                 return -1;
 477                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 478                                 skb_copy_bits(skb, hdrlen +
 479                                         offsetof(struct ieee80211s_hdr, eaddr1),
 480                                         tmp.h_dest, 2 * ETH_ALEN);
 481                         }
 482                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 483                 }
 484                 break;
 485         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 486                 if ((iftype != NL80211_IFTYPE_STATION &&
 487                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 488                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 489                     (is_multicast_ether_addr(tmp.h_dest) &&
 490                      ether_addr_equal(tmp.h_source, addr)))
 491                         return -1;
 492                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 493                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 494                                 return -1;
 495                         if (mesh_flags == MESH_FLAGS_AE_A4)
 496                                 skb_copy_bits(skb, hdrlen +
 497                                         offsetof(struct ieee80211s_hdr, eaddr1),
 498                                         tmp.h_source, ETH_ALEN);
 499                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 500                 }
 501                 break;
 502         case cpu_to_le16(0):
 503                 if (iftype != NL80211_IFTYPE_ADHOC &&
 504                     iftype != NL80211_IFTYPE_STATION &&
 505                     iftype != NL80211_IFTYPE_OCB)
 506                                 return -1;
 507                 break;
 508         }
 509
 510         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 511         tmp.h_proto = payload.proto;
 512
 513         if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
 514                     tmp.h_proto != htons(ETH_P_AARP) &&
 515                     tmp.h_proto != htons(ETH_P_IPX)) ||
 516                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 517                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 518                  * replace EtherType */
 519                 hdrlen += ETH_ALEN + 2;
 520         else
 521                 tmp.h_proto = htons(skb->len - hdrlen);
 522
 523         pskb_pull(skb, hdrlen);
 524
 525         if (!ehdr)
 526                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 527         memcpy(ehdr, &tmp, sizeof(tmp));
 528
 529         return 0;
 530 }
 531 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 532
 533 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 534                              enum nl80211_iftype iftype,
 535                              const u8 *bssid, bool qos)
 536 {
 537         struct ieee80211_hdr hdr;
 538         u16 hdrlen, ethertype;
 539         __le16 fc;
 540         const u8 *encaps_data;
 541         int encaps_len, skip_header_bytes;
 542         int nh_pos, h_pos;
 543         int head_need;
 544
 545         if (unlikely(skb->len < ETH_HLEN))
 546                 return -EINVAL;
 547
 548         nh_pos = skb_network_header(skb) - skb->data;
 549         h_pos = skb_transport_header(skb) - skb->data;
 550
 551         /* convert Ethernet header to proper 802.11 header (based on
 552          * operation mode) */
 553         ethertype = (skb->data[12] << 8) | skb->data[13];
 554         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 555
 556         switch (iftype) {
 557         case NL80211_IFTYPE_AP:
 558         case NL80211_IFTYPE_AP_VLAN:
 559         case NL80211_IFTYPE_P2P_GO:
 560                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 561                 /* DA BSSID SA */
 562                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 563                 memcpy(hdr.addr2, addr, ETH_ALEN);
 564                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 565                 hdrlen = 24;
 566                 break;
 567         case NL80211_IFTYPE_STATION:
 568         case NL80211_IFTYPE_P2P_CLIENT:
 569                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 570                 /* BSSID SA DA */
 571                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 572                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 573                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 574                 hdrlen = 24;
 575                 break;
 576         case NL80211_IFTYPE_OCB:
 577         case NL80211_IFTYPE_ADHOC:
 578                 /* DA SA BSSID */
 579                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 580                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 581                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 582                 hdrlen = 24;
 583                 break;
 584         default:
 585                 return -EOPNOTSUPP;
 586         }
 587
 588         if (qos) {
 589                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 590                 hdrlen += 2;
 591         }
 592
 593         hdr.frame_control = fc;
 594         hdr.duration_id = 0;
 595         hdr.seq_ctrl = 0;
 596
 597         skip_header_bytes = ETH_HLEN;
 598         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 599                 encaps_data = bridge_tunnel_header;
 600                 encaps_len = sizeof(bridge_tunnel_header);
 601                 skip_header_bytes -= 2;
 602         } else if (ethertype >= ETH_P_802_3_MIN) {
 603                 encaps_data = rfc1042_header;
 604                 encaps_len = sizeof(rfc1042_header);
 605                 skip_header_bytes -= 2;
 606         } else {
 607                 encaps_data = NULL;
 608                 encaps_len = 0;
 609         }
 610
 611         skb_pull(skb, skip_header_bytes);
 612         nh_pos -= skip_header_bytes;
 613         h_pos -= skip_header_bytes;
 614
 615         head_need = hdrlen + encaps_len - skb_headroom(skb);
 616
 617         if (head_need > 0 || skb_cloned(skb)) {
 618                 head_need = max(head_need, 0);
 619                 if (head_need)
 620                         skb_orphan(skb);
 621
 622                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 623                         return -ENOMEM;
 624
 625                 skb->truesize += head_need;
 626         }
 627
 628         if (encaps_data) {
 629                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 630                 nh_pos += encaps_len;
 631                 h_pos += encaps_len;
 632         }
 633
 634         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 635
 636         nh_pos += hdrlen;
 637         h_pos += hdrlen;
 638
 639         /* Update skb pointers to various headers since this modified frame
 640          * is going to go through Linux networking code that may potentially
 641          * need things like pointer to IP header. */
 642         skb_reset_mac_header(skb);
 643         skb_set_network_header(skb, nh_pos);
 644         skb_set_transport_header(skb, h_pos);
 645
 646         return 0;
 647 }
 648 EXPORT_SYMBOL(ieee80211_data_from_8023);
 649
 650 static void
 651 __frame_add_frag(struct sk_buff *skb, struct page *page,
 652                  void *ptr, int len, int size)
 653 {
 654         struct skb_shared_info *sh = skb_shinfo(skb);
 655         int page_offset;
 656
 657         get_page(page);
 658         page_offset = ptr - page_address(page);
 659         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 660 }
 661
 662 static void
 663 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 664                             int offset, int len)
 665 {
 666         struct skb_shared_info *sh = skb_shinfo(skb);
 667         const skb_frag_t *frag = &sh->frags[0];
 668         struct page *frag_page;
 669         void *frag_ptr;
 670         int frag_len, frag_size;
 671         int head_size = skb->len - skb->data_len;
 672         int cur_len;
 673
 674         frag_page = virt_to_head_page(skb->head);
 675         frag_ptr = skb->data;
 676         frag_size = head_size;
 677
 678         while (offset >= frag_size) {
 679                 offset -= frag_size;
 680                 frag_page = skb_frag_page(frag);
 681                 frag_ptr = skb_frag_address(frag);
 682                 frag_size = skb_frag_size(frag);
 683                 frag++;
 684         }
 685
 686         frag_ptr += offset;
 687         frag_len = frag_size - offset;
 688
 689         cur_len = min(len, frag_len);
 690
 691         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 692         len -= cur_len;
 693
 694         while (len > 0) {
 695                 frag_len = skb_frag_size(frag);
 696                 cur_len = min(len, frag_len);
 697                 __frame_add_frag(frame, skb_frag_page(frag),
 698                                  skb_frag_address(frag), cur_len, frag_len);
 699                 len -= cur_len;
 700                 frag++;
 701         }
 702 }
 703
 704 static struct sk_buff *
 705 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 706                        int offset, int len, bool reuse_frag)
 707 {
 708         struct sk_buff *frame;
 709         int cur_len = len;
 710
 711         if (skb->len - offset < len)
 712                 return NULL;
 713
 714         /*
 715          * When reusing framents, copy some data to the head to simplify
 716          * ethernet header handling and speed up protocol header processing
 717          * in the stack later.
 718          */
 719         if (reuse_frag)
 720                 cur_len = min_t(int, len, 32);
 721
 722         /*
 723          * Allocate and reserve two bytes more for payload
 724          * alignment since sizeof(struct ethhdr) is 14.
 725          */
 726         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 727         if (!frame)
 728                 return NULL;
 729
 730         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 731         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 732
 733         len -= cur_len;
 734         if (!len)
 735                 return frame;
 736
 737         offset += cur_len;
 738         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 739
 740         return frame;
 741 }
 742
 743 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 744                               const u8 *addr, enum nl80211_iftype iftype,
 745                               const unsigned int extra_headroom,
 746                               const u8 *check_da, const u8 *check_sa)
 747 {
 748         unsigned int hlen = ALIGN(extra_headroom, 4);
 749         struct sk_buff *frame = NULL;
 750         u16 ethertype;
 751         u8 *payload;
 752         int offset = 0, remaining;
 753         struct ethhdr eth;
 754         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 755         bool reuse_skb = false;
 756         bool last = false;
 757
 758         while (!last) {
 759                 unsigned int subframe_len;
 760                 int len;
 761                 u8 padding;
 762
 763                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 764                 len = ntohs(eth.h_proto);
 765                 subframe_len = sizeof(struct ethhdr) + len;
 766                 padding = (4 - subframe_len) & 0x3;
 767
 768                 /* the last MSDU has no padding */
 769                 remaining = skb->len - offset;
 770                 if (subframe_len > remaining)
 771                         goto purge;
 772                 /* mitigate A-MSDU aggregation injection attacks */
 773                 if (ether_addr_equal(eth.h_dest, rfc1042_header))
 774                         goto purge;
 775
 776                 offset += sizeof(struct ethhdr);
 777                 last = remaining <= subframe_len + padding;
 778
 779                 /* FIXME: should we really accept multicast DA? */
 780                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 781                      !ether_addr_equal(check_da, eth.h_dest)) ||
 782                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 783                         offset += len + padding;
 784                         continue;
 785                 }
 786
 787                 /* reuse skb for the last subframe */
 788                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 789                         skb_pull(skb, offset);
 790                         frame = skb;
 791                         reuse_skb = true;
 792                 } else {
 793                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 794                                                        reuse_frag);
 795                         if (!frame)
 796                                 goto purge;
 797
 798                         offset += len + padding;
 799                 }
 800
 801                 skb_reset_network_header(frame);
 802                 frame->dev = skb->dev;
 803                 frame->priority = skb->priority;
 804
 805                 payload = frame->data;
 806                 ethertype = (payload[6] << 8) | payload[7];
 807                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 808                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 809                            ether_addr_equal(payload, bridge_tunnel_header))) {
 810                         eth.h_proto = htons(ethertype);
 811                         skb_pull(frame, ETH_ALEN + 2);
 812                 }
 813
 814                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 815                 __skb_queue_tail(list, frame);
 816         }
 817
 818         if (!reuse_skb)
 819                 dev_kfree_skb(skb);
 820
 821         return;
 822
 823  purge:
 824         __skb_queue_purge(list);
 825         dev_kfree_skb(skb);
 826 }
 827 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 828
 829 /* Given a data frame determine the 802.1p/1d tag to use. */
 830 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 831                                     struct cfg80211_qos_map *qos_map)
 832 {
 833         unsigned int dscp;
 834         unsigned char vlan_priority;
 835
 836         /* skb->priority values from 256->263 are magic values to
 837          * directly indicate a specific 802.1d priority.  This is used
 838          * to allow 802.1d priority to be passed directly in from VLAN
 839          * tags, etc.
 840          */
 841         if (skb->priority >= 256 && skb->priority <= 263)
 842                 return skb->priority - 256;
 843
 844         if (skb_vlan_tag_present(skb)) {
 845                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 846                         >> VLAN_PRIO_SHIFT;
 847                 if (vlan_priority > 0)
 848                         return vlan_priority;
 849         }
 850
 851         switch (skb->protocol) {
 852         case htons(ETH_P_IP):
 853                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 854                 break;
 855         case htons(ETH_P_IPV6):
 856                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 857                 break;
 858         case htons(ETH_P_MPLS_UC):
 859         case htons(ETH_P_MPLS_MC): {
 860                 struct mpls_label mpls_tmp, *mpls;
 861
 862                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 863                                           sizeof(*mpls), &mpls_tmp);
 864                 if (!mpls)
 865                         return 0;
 866
 867                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 868                         >> MPLS_LS_TC_SHIFT;
 869         }
 870         case htons(ETH_P_80221):
 871                 /* 802.21 is always network control traffic */
 872                 return 7;
 873         default:
 874                 return 0;
 875         }
 876
 877         if (qos_map) {
 878                 unsigned int i, tmp_dscp = dscp >> 2;
 879
 880                 for (i = 0; i < qos_map->num_des; i++) {
 881                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 882                                 return qos_map->dscp_exception[i].up;
 883                 }
 884
 885                 for (i = 0; i < 8; i++) {
 886                         if (tmp_dscp >= qos_map->up[i].low &&
 887                             tmp_dscp <= qos_map->up[i].high)
 888                                 return i;
 889                 }
 890         }
 891
 892         return dscp >> 5;
 893 }
 894 EXPORT_SYMBOL(cfg80211_classify8021d);
 895
 896 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 897 {
 898         const struct cfg80211_bss_ies *ies;
 899
 900         ies = rcu_dereference(bss->ies);
 901         if (!ies)
 902                 return NULL;
 903
 904         return cfg80211_find_ie(ie, ies->data, ies->len);
 905 }
 906 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 907
 908 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 909 {
 910         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 911         struct net_device *dev = wdev->netdev;
 912         int i;
 913
 914         if (!wdev->connect_keys)
 915                 return;
 916
 917         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 918                 if (!wdev->connect_keys->params[i].cipher)
 919                         continue;
 920                 if (rdev_add_key(rdev, dev, i, false, NULL,
 921                                  &wdev->connect_keys->params[i])) {
 922                         netdev_err(dev, "failed to set key %d\n", i);
 923                         continue;
 924                 }
 925                 if (wdev->connect_keys->def == i)
 926                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 927                                 netdev_err(dev, "failed to set defkey %d\n", i);
 928                                 continue;
 929                         }
 930         }
 931
 932         kzfree(wdev->connect_keys);
 933         wdev->connect_keys = NULL;
 934 }
 935
 936 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 937 {
 938         struct cfg80211_event *ev;
 939         unsigned long flags;
 940         const u8 *bssid = NULL;
 941
 942         spin_lock_irqsave(&wdev->event_lock, flags);
 943         while (!list_empty(&wdev->event_list)) {
 944                 ev = list_first_entry(&wdev->event_list,
 945                                       struct cfg80211_event, list);
 946                 list_del(&ev->list);
 947                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 948
 949                 wdev_lock(wdev);
 950                 switch (ev->type) {
 951                 case EVENT_CONNECT_RESULT:
 952                         if (!is_zero_ether_addr(ev->cr.bssid))
 953                                 bssid = ev->cr.bssid;
 954                         __cfg80211_connect_result(
 955                                 wdev->netdev, bssid,
 956                                 ev->cr.req_ie, ev->cr.req_ie_len,
 957                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 958                                 ev->cr.status,
 959                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 960                                 ev->cr.bss);
 961                         break;
 962                 case EVENT_ROAMED:
 963                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 964                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 965                                           ev->rm.resp_ie_len);
 966                         break;
 967                 case EVENT_DISCONNECTED:
 968                         __cfg80211_disconnected(wdev->netdev,
 969                                                 ev->dc.ie, ev->dc.ie_len,
 970                                                 ev->dc.reason,
 971                                                 !ev->dc.locally_generated);
 972                         break;
 973                 case EVENT_IBSS_JOINED:
 974                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 975                                                ev->ij.channel);
 976                         break;
 977                 case EVENT_STOPPED:
 978                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 979                         break;
 980                 }
 981                 wdev_unlock(wdev);
 982
 983                 kfree(ev);
 984
 985                 spin_lock_irqsave(&wdev->event_lock, flags);
 986         }
 987         spin_unlock_irqrestore(&wdev->event_lock, flags);
 988 }
 989
 990 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 991 {
 992         struct wireless_dev *wdev;
 993
 994         ASSERT_RTNL();
 995
 996         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 997                 cfg80211_process_wdev_events(wdev);
 998 }
 999
1000 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
1001                           struct net_device *dev, enum nl80211_iftype ntype,
1002                           u32 *flags, struct vif_params *params)
1003 {
1004         int err;
1005         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1006
1007         ASSERT_RTNL();
1008
1009         /* don't support changing VLANs, you just re-create them */
1010         if (otype == NL80211_IFTYPE_AP_VLAN)
1011                 return -EOPNOTSUPP;
1012
1013         /* cannot change into P2P device or NAN */
1014         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1015             ntype == NL80211_IFTYPE_NAN)
1016                 return -EOPNOTSUPP;
1017
1018         if (!rdev->ops->change_virtual_intf ||
1019             !(rdev->wiphy.interface_modes & (1 << ntype)))
1020                 return -EOPNOTSUPP;
1021
1022         /* if it's part of a bridge, reject changing type to station/ibss */
1023         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1024             (ntype == NL80211_IFTYPE_ADHOC ||
1025              ntype == NL80211_IFTYPE_STATION ||
1026              ntype == NL80211_IFTYPE_P2P_CLIENT))
1027                 return -EBUSY;
1028
1029         if (ntype != otype) {
1030                 dev->ieee80211_ptr->use_4addr = false;
1031                 dev->ieee80211_ptr->mesh_id_up_len = 0;
1032                 wdev_lock(dev->ieee80211_ptr);
1033                 rdev_set_qos_map(rdev, dev, NULL);
1034                 wdev_unlock(dev->ieee80211_ptr);
1035
1036                 switch (otype) {
1037                 case NL80211_IFTYPE_AP:
1038                         cfg80211_stop_ap(rdev, dev, true);
1039                         break;
1040                 case NL80211_IFTYPE_ADHOC:
1041                         cfg80211_leave_ibss(rdev, dev, false);
1042                         break;
1043                 case NL80211_IFTYPE_STATION:
1044                 case NL80211_IFTYPE_P2P_CLIENT:
1045                         wdev_lock(dev->ieee80211_ptr);
1046                         cfg80211_disconnect(rdev, dev,
1047                                             WLAN_REASON_DEAUTH_LEAVING, true);
1048                         wdev_unlock(dev->ieee80211_ptr);
1049                         break;
1050                 case NL80211_IFTYPE_MESH_POINT:
1051                         /* mesh should be handled? */
1052                         break;
1053                 case NL80211_IFTYPE_OCB:
1054                         cfg80211_leave_ocb(rdev, dev);
1055                         break;
1056                 default:
1057                         break;
1058                 }
1059
1060                 cfg80211_process_rdev_events(rdev);
1061                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1062         }
1063
1064         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
1065
1066         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1067
1068         if (!err && params && params->use_4addr != -1)
1069                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1070
1071         if (!err) {
1072                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1073                 switch (ntype) {
1074                 case NL80211_IFTYPE_STATION:
1075                         if (dev->ieee80211_ptr->use_4addr)
1076                                 break;
1077                         /* fall through */
1078                 case NL80211_IFTYPE_OCB:
1079                 case NL80211_IFTYPE_P2P_CLIENT:
1080                 case NL80211_IFTYPE_ADHOC:
1081                         dev->priv_flags |= IFF_DONT_BRIDGE;
1082                         break;
1083                 case NL80211_IFTYPE_P2P_GO:
1084                 case NL80211_IFTYPE_AP:
1085                 case NL80211_IFTYPE_AP_VLAN:
1086                 case NL80211_IFTYPE_WDS:
1087                 case NL80211_IFTYPE_MESH_POINT:
1088                         /* bridging OK */
1089                         break;
1090                 case NL80211_IFTYPE_MONITOR:
1091                         /* monitor can't bridge anyway */
1092                         break;
1093                 case NL80211_IFTYPE_UNSPECIFIED:
1094                 case NUM_NL80211_IFTYPES:
1095                         /* not happening */
1096                         break;
1097                 case NL80211_IFTYPE_P2P_DEVICE:
1098                 case NL80211_IFTYPE_NAN:
1099                         WARN_ON(1);
1100                         break;
1101                 }
1102         }
1103
1104         if (!err && ntype != otype && netif_running(dev)) {
1105                 cfg80211_update_iface_num(rdev, ntype, 1);
1106                 cfg80211_update_iface_num(rdev, otype, -1);
1107         }
1108
1109         return err;
1110 }
1111
1112 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1113 {
1114         static const u32 __mcs2bitrate[] = {
1115                 /* control PHY */
1116                 [0] =   275,
1117                 /* SC PHY */
1118                 [1] =  3850,
1119                 [2] =  7700,
1120                 [3] =  9625,
1121                 [4] = 11550,
1122                 [5] = 12512, /* 1251.25 mbps */
1123                 [6] = 15400,
1124                 [7] = 19250,
1125                 [8] = 23100,
1126                 [9] = 25025,
1127                 [10] = 30800,
1128                 [11] = 38500,
1129                 [12] = 46200,
1130                 /* OFDM PHY */
1131                 [13] =  6930,
1132                 [14] =  8662, /* 866.25 mbps */
1133                 [15] = 13860,
1134                 [16] = 17325,
1135                 [17] = 20790,
1136                 [18] = 27720,
1137                 [19] = 34650,
1138                 [20] = 41580,
1139                 [21] = 45045,
1140                 [22] = 51975,
1141                 [23] = 62370,
1142                 [24] = 67568, /* 6756.75 mbps */
1143                 /* LP-SC PHY */
1144                 [25] =  6260,
1145                 [26] =  8340,
1146                 [27] = 11120,
1147                 [28] = 12510,
1148                 [29] = 16680,
1149                 [30] = 22240,
1150                 [31] = 25030,
1151         };
1152
1153         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1154                 return 0;
1155
1156         return __mcs2bitrate[rate->mcs];
1157 }
1158
1159 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1160 {
1161         static const u32 base[4][10] = {
1162                 {   6500000,
1163                    13000000,
1164                    19500000,
1165                    26000000,
1166                    39000000,
1167                    52000000,
1168                    58500000,
1169                    65000000,
1170                    78000000,
1171                 /* not in the spec, but some devices use this: */
1172                    86500000,
1173                 },
1174                 {  13500000,
1175                    27000000,
1176                    40500000,
1177                    54000000,
1178                    81000000,
1179                   108000000,
1180                   121500000,
1181                   135000000,
1182                   162000000,
1183                   180000000,
1184                 },
1185                 {  29300000,
1186                    58500000,
1187                    87800000,
1188                   117000000,
1189                   175500000,
1190                   234000000,
1191                   263300000,
1192                   292500000,
1193                   351000000,
1194                   390000000,
1195                 },
1196                 {  58500000,
1197                   117000000,
1198                   175500000,
1199                   234000000,
1200                   351000000,
1201                   468000000,
1202                   526500000,
1203                   585000000,
1204                   702000000,
1205                   780000000,
1206                 },
1207         };
1208         u32 bitrate;
1209         int idx;
1210
1211         if (WARN_ON_ONCE(rate->mcs > 9))
1212                 return 0;
1213
1214         switch (rate->bw) {
1215         case RATE_INFO_BW_160:
1216                 idx = 3;
1217                 break;
1218         case RATE_INFO_BW_80:
1219                 idx = 2;
1220                 break;
1221         case RATE_INFO_BW_40:
1222                 idx = 1;
1223                 break;
1224         case RATE_INFO_BW_5:
1225         case RATE_INFO_BW_10:
1226         default:
1227                 WARN_ON(1);
1228                 /* fall through */
1229         case RATE_INFO_BW_20:
1230                 idx = 0;
1231         }
1232
1233         bitrate = base[idx][rate->mcs];
1234         bitrate *= rate->nss;
1235
1236         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1237                 bitrate = (bitrate / 9) * 10;
1238
1239         /* do NOT round down here */
1240         return (bitrate + 50000) / 100000;
1241 }
1242
1243 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1244 {
1245         int modulation, streams, bitrate;
1246
1247         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1248             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1249                 return rate->legacy;
1250         if (rate->flags & RATE_INFO_FLAGS_60G)
1251                 return cfg80211_calculate_bitrate_60g(rate);
1252         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1253                 return cfg80211_calculate_bitrate_vht(rate);
1254
1255         /* the formula below does only work for MCS values smaller than 32 */
1256         if (WARN_ON_ONCE(rate->mcs >= 32))
1257                 return 0;
1258
1259         modulation = rate->mcs & 7;
1260         streams = (rate->mcs >> 3) + 1;
1261
1262         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1263
1264         if (modulation < 4)
1265                 bitrate *= (modulation + 1);
1266         else if (modulation == 4)
1267                 bitrate *= (modulation + 2);
1268         else
1269                 bitrate *= (modulation + 3);
1270
1271         bitrate *= streams;
1272
1273         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1274                 bitrate = (bitrate / 9) * 10;
1275
1276         /* do NOT round down here */
1277         return (bitrate + 50000) / 100000;
1278 }
1279 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1280
1281 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1282                           enum ieee80211_p2p_attr_id attr,
1283                           u8 *buf, unsigned int bufsize)
1284 {
1285         u8 *out = buf;
1286         u16 attr_remaining = 0;
1287         bool desired_attr = false;
1288         u16 desired_len = 0;
1289
1290         while (len > 0) {
1291                 unsigned int iedatalen;
1292                 unsigned int copy;
1293                 const u8 *iedata;
1294
1295                 if (len < 2)
1296                         return -EILSEQ;
1297                 iedatalen = ies[1];
1298                 if (iedatalen + 2 > len)
1299                         return -EILSEQ;
1300
1301                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1302                         goto cont;
1303
1304                 if (iedatalen < 4)
1305                         goto cont;
1306
1307                 iedata = ies + 2;
1308
1309                 /* check WFA OUI, P2P subtype */
1310                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1311                     iedata[2] != 0x9a || iedata[3] != 0x09)
1312                         goto cont;
1313
1314                 iedatalen -= 4;
1315                 iedata += 4;
1316
1317                 /* check attribute continuation into this IE */
1318                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1319                 if (copy && desired_attr) {
1320                         desired_len += copy;
1321                         if (out) {
1322                                 memcpy(out, iedata, min(bufsize, copy));
1323                                 out += min(bufsize, copy);
1324                                 bufsize -= min(bufsize, copy);
1325                         }
1326
1327
1328                         if (copy == attr_remaining)
1329                                 return desired_len;
1330                 }
1331
1332                 attr_remaining -= copy;
1333                 if (attr_remaining)
1334                         goto cont;
1335
1336                 iedatalen -= copy;
1337                 iedata += copy;
1338
1339                 while (iedatalen > 0) {
1340                         u16 attr_len;
1341
1342                         /* P2P attribute ID & size must fit */
1343                         if (iedatalen < 3)
1344                                 return -EILSEQ;
1345                         desired_attr = iedata[0] == attr;
1346                         attr_len = get_unaligned_le16(iedata + 1);
1347                         iedatalen -= 3;
1348                         iedata += 3;
1349
1350                         copy = min_t(unsigned int, attr_len, iedatalen);
1351
1352                         if (desired_attr) {
1353                                 desired_len += copy;
1354                                 if (out) {
1355                                         memcpy(out, iedata, min(bufsize, copy));
1356                                         out += min(bufsize, copy);
1357                                         bufsize -= min(bufsize, copy);
1358                                 }
1359
1360                                 if (copy == attr_len)
1361                                         return desired_len;
1362                         }
1363
1364                         iedata += copy;
1365                         iedatalen -= copy;
1366                         attr_remaining = attr_len - copy;
1367                 }
1368
1369  cont:
1370                 len -= ies[1] + 2;
1371                 ies += ies[1] + 2;
1372         }
1373
1374         if (attr_remaining && desired_attr)
1375                 return -EILSEQ;
1376
1377         return -ENOENT;
1378 }
1379 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1380
1381 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1382 {
1383         int i;
1384
1385         for (i = 0; i < n_ids; i++)
1386                 if (ids[i] == id)
1387                         return true;
1388         return false;
1389 }
1390
1391 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1392                               const u8 *ids, int n_ids,
1393                               const u8 *after_ric, int n_after_ric,
1394                               size_t offset)
1395 {
1396         size_t pos = offset;
1397
1398         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1399                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1400                         pos += 2 + ies[pos + 1];
1401
1402                         while (pos < ielen &&
1403                                !ieee80211_id_in_list(after_ric, n_after_ric,
1404                                                      ies[pos]))
1405                                 pos += 2 + ies[pos + 1];
1406                 } else {
1407                         pos += 2 + ies[pos + 1];
1408                 }
1409         }
1410
1411         return pos;
1412 }
1413 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1414
1415 bool ieee80211_operating_class_to_band(u8 operating_class,
1416                                        enum nl80211_band *band)
1417 {
1418         switch (operating_class) {
1419         case 112:
1420         case 115 ... 127:
1421         case 128 ... 130:
1422                 *band = NL80211_BAND_5GHZ;
1423                 return true;
1424         case 81:
1425         case 82:
1426         case 83:
1427         case 84:
1428                 *band = NL80211_BAND_2GHZ;
1429                 return true;
1430         case 180:
1431                 *band = NL80211_BAND_60GHZ;
1432                 return true;
1433         }
1434
1435         return false;
1436 }
1437 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1438
1439 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1440                                           u8 *op_class)
1441 {
1442         u8 vht_opclass;
1443         u32 freq = chandef->center_freq1;
1444
1445         if (freq >= 2412 && freq <= 2472) {
1446                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1447                         return false;
1448
1449                 /* 2.407 GHz, channels 1..13 */
1450                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1451                         if (freq > chandef->chan->center_freq)
1452                                 *op_class = 83; /* HT40+ */
1453                         else
1454                                 *op_class = 84; /* HT40- */
1455                 } else {
1456                         *op_class = 81;
1457                 }
1458
1459                 return true;
1460         }
1461
1462         if (freq == 2484) {
1463                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1464                         return false;
1465
1466                 *op_class = 82; /* channel 14 */
1467                 return true;
1468         }
1469
1470         switch (chandef->width) {
1471         case NL80211_CHAN_WIDTH_80:
1472                 vht_opclass = 128;
1473                 break;
1474         case NL80211_CHAN_WIDTH_160:
1475                 vht_opclass = 129;
1476                 break;
1477         case NL80211_CHAN_WIDTH_80P80:
1478                 vht_opclass = 130;
1479                 break;
1480         case NL80211_CHAN_WIDTH_10:
1481         case NL80211_CHAN_WIDTH_5:
1482                 return false; /* unsupported for now */
1483         default:
1484                 vht_opclass = 0;
1485                 break;
1486         }
1487
1488         /* 5 GHz, channels 36..48 */
1489         if (freq >= 5180 && freq <= 5240) {
1490                 if (vht_opclass) {
1491                         *op_class = vht_opclass;
1492                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1493                         if (freq > chandef->chan->center_freq)
1494                                 *op_class = 116;
1495                         else
1496                                 *op_class = 117;
1497                 } else {
1498                         *op_class = 115;
1499                 }
1500
1501                 return true;
1502         }
1503
1504         /* 5 GHz, channels 52..64 */
1505         if (freq >= 5260 && freq <= 5320) {
1506                 if (vht_opclass) {
1507                         *op_class = vht_opclass;
1508                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1509                         if (freq > chandef->chan->center_freq)
1510                                 *op_class = 119;
1511                         else
1512                                 *op_class = 120;
1513                 } else {
1514                         *op_class = 118;
1515                 }
1516
1517                 return true;
1518         }
1519
1520         /* 5 GHz, channels 100..144 */
1521         if (freq >= 5500 && freq <= 5720) {
1522                 if (vht_opclass) {
1523                         *op_class = vht_opclass;
1524                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1525                         if (freq > chandef->chan->center_freq)
1526                                 *op_class = 122;
1527                         else
1528                                 *op_class = 123;
1529                 } else {
1530                         *op_class = 121;
1531                 }
1532
1533                 return true;
1534         }
1535
1536         /* 5 GHz, channels 149..169 */
1537         if (freq >= 5745 && freq <= 5845) {
1538                 if (vht_opclass) {
1539                         *op_class = vht_opclass;
1540                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1541                         if (freq > chandef->chan->center_freq)
1542                                 *op_class = 126;
1543                         else
1544                                 *op_class = 127;
1545                 } else if (freq <= 5805) {
1546                         *op_class = 124;
1547                 } else {
1548                         *op_class = 125;
1549                 }
1550
1551                 return true;
1552         }
1553
1554         /* 56.16 GHz, channel 1..4 */
1555         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1556                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1557                         return false;
1558
1559                 *op_class = 180;
1560                 return true;
1561         }
1562
1563         /* not supported yet */
1564         return false;
1565 }
1566 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1567
1568 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1569                                  u32 beacon_int)
1570 {
1571         struct wireless_dev *wdev;
1572         int res = 0;
1573
1574         if (beacon_int < 10 || beacon_int > 10000)
1575                 return -EINVAL;
1576
1577         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1578                 if (!wdev->beacon_interval)
1579                         continue;
1580                 if (wdev->beacon_interval != beacon_int) {
1581                         res = -EINVAL;
1582                         break;
1583                 }
1584         }
1585
1586         return res;
1587 }
1588
1589 int cfg80211_iter_combinations(struct wiphy *wiphy,
1590                                const int num_different_channels,
1591                                const u8 radar_detect,
1592                                const int iftype_num[NUM_NL80211_IFTYPES],
1593                                void (*iter)(const struct ieee80211_iface_combination *c,
1594                                             void *data),
1595                                void *data)
1596 {
1597         const struct ieee80211_regdomain *regdom;
1598         enum nl80211_dfs_regions region = 0;
1599         int i, j, iftype;
1600         int num_interfaces = 0;
1601         u32 used_iftypes = 0;
1602
1603         if (radar_detect) {
1604                 rcu_read_lock();
1605                 regdom = rcu_dereference(cfg80211_regdomain);
1606                 if (regdom)
1607                         region = regdom->dfs_region;
1608                 rcu_read_unlock();
1609         }
1610
1611         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1612                 num_interfaces += iftype_num[iftype];
1613                 if (iftype_num[iftype] > 0 &&
1614                     !(wiphy->software_iftypes & BIT(iftype)))
1615                         used_iftypes |= BIT(iftype);
1616         }
1617
1618         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1619                 const struct ieee80211_iface_combination *c;
1620                 struct ieee80211_iface_limit *limits;
1621                 u32 all_iftypes = 0;
1622
1623                 c = &wiphy->iface_combinations[i];
1624
1625                 if (num_interfaces > c->max_interfaces)
1626                         continue;
1627                 if (num_different_channels > c->num_different_channels)
1628                         continue;
1629
1630                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1631                                  GFP_KERNEL);
1632                 if (!limits)
1633                         return -ENOMEM;
1634
1635                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1636                         if (wiphy->software_iftypes & BIT(iftype))
1637                                 continue;
1638                         for (j = 0; j < c->n_limits; j++) {
1639                                 all_iftypes |= limits[j].types;
1640                                 if (!(limits[j].types & BIT(iftype)))
1641                                         continue;
1642                                 if (limits[j].max < iftype_num[iftype])
1643                                         goto cont;
1644                                 limits[j].max -= iftype_num[iftype];
1645                         }
1646                 }
1647
1648                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1649                         goto cont;
1650
1651                 if (radar_detect && c->radar_detect_regions &&
1652                     !(c->radar_detect_regions & BIT(region)))
1653                         goto cont;
1654
1655                 /* Finally check that all iftypes that we're currently
1656                  * using are actually part of this combination. If they
1657                  * aren't then we can't use this combination and have
1658                  * to continue to the next.
1659                  */
1660                 if ((all_iftypes & used_iftypes) != used_iftypes)
1661                         goto cont;
1662
1663                 /* This combination covered all interface types and
1664                  * supported the requested numbers, so we're good.
1665                  */
1666
1667                 (*iter)(c, data);
1668  cont:
1669                 kfree(limits);
1670         }
1671
1672         return 0;
1673 }
1674 EXPORT_SYMBOL(cfg80211_iter_combinations);
1675
1676 static void
1677 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1678                           void *data)
1679 {
1680         int *num = data;
1681         (*num)++;
1682 }
1683
1684 int cfg80211_check_combinations(struct wiphy *wiphy,
1685                                 const int num_different_channels,
1686                                 const u8 radar_detect,
1687                                 const int iftype_num[NUM_NL80211_IFTYPES])
1688 {
1689         int err, num = 0;
1690
1691         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1692                                          radar_detect, iftype_num,
1693                                          cfg80211_iter_sum_ifcombs, &num);
1694         if (err)
1695                 return err;
1696         if (num == 0)
1697                 return -EBUSY;
1698
1699         return 0;
1700 }
1701 EXPORT_SYMBOL(cfg80211_check_combinations);
1702
1703 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1704                            const u8 *rates, unsigned int n_rates,
1705                            u32 *mask)
1706 {
1707         int i, j;
1708
1709         if (!sband)
1710                 return -EINVAL;
1711
1712         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1713                 return -EINVAL;
1714
1715         *mask = 0;
1716
1717         for (i = 0; i < n_rates; i++) {
1718                 int rate = (rates[i] & 0x7f) * 5;
1719                 bool found = false;
1720
1721                 for (j = 0; j < sband->n_bitrates; j++) {
1722                         if (sband->bitrates[j].bitrate == rate) {
1723                                 found = true;
1724                                 *mask |= BIT(j);
1725                                 break;
1726                         }
1727                 }
1728                 if (!found)
1729                         return -EINVAL;
1730         }
1731
1732         /*
1733          * mask must have at least one bit set here since we
1734          * didn't accept a 0-length rates array nor allowed
1735          * entries in the array that didn't exist
1736          */
1737
1738         return 0;
1739 }
1740
1741 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1742 {
1743         enum nl80211_band band;
1744         unsigned int n_channels = 0;
1745
1746         for (band = 0; band < NUM_NL80211_BANDS; band++)
1747                 if (wiphy->bands[band])
1748                         n_channels += wiphy->bands[band]->n_channels;
1749
1750         return n_channels;
1751 }
1752 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1753
1754 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1755                          struct station_info *sinfo)
1756 {
1757         struct cfg80211_registered_device *rdev;
1758         struct wireless_dev *wdev;
1759
1760         wdev = dev->ieee80211_ptr;
1761         if (!wdev)
1762                 return -EOPNOTSUPP;
1763
1764         rdev = wiphy_to_rdev(wdev->wiphy);
1765         if (!rdev->ops->get_station)
1766                 return -EOPNOTSUPP;
1767
1768         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1769 }
1770 EXPORT_SYMBOL(cfg80211_get_station);
1771
1772 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1773 {
1774         int i;
1775
1776         if (!f)
1777                 return;
1778
1779         kfree(f->serv_spec_info);
1780         kfree(f->srf_bf);
1781         kfree(f->srf_macs);
1782         for (i = 0; i < f->num_rx_filters; i++)
1783                 kfree(f->rx_filters[i].filter);
1784
1785         for (i = 0; i < f->num_tx_filters; i++)
1786                 kfree(f->tx_filters[i].filter);
1787
1788         kfree(f->rx_filters);
1789         kfree(f->tx_filters);
1790         kfree(f);
1791 }
1792 EXPORT_SYMBOL(cfg80211_free_nan_func);
1793
1794 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1795 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1796 const unsigned char rfc1042_header[] __aligned(2) =
1797         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1798 EXPORT_SYMBOL(rfc1042_header);
1799
1800 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1801 const unsigned char bridge_tunnel_header[] __aligned(2) =
1802         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1803 EXPORT_SYMBOL(bridge_tunnel_header);
1804
1805 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
1806 struct iapp_layer2_update {
1807         u8 da[ETH_ALEN];        /* broadcast */
1808         u8 sa[ETH_ALEN];        /* STA addr */
1809         __be16 len;             /* 6 */
1810         u8 dsap;                /* 0 */
1811         u8 ssap;                /* 0 */
1812         u8 control;
1813         u8 xid_info[3];
1814 } __packed;
1815
1816 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
1817 {
1818         struct iapp_layer2_update *msg;
1819         struct sk_buff *skb;
1820
1821         /* Send Level 2 Update Frame to update forwarding tables in layer 2
1822          * bridge devices */
1823
1824         skb = dev_alloc_skb(sizeof(*msg));
1825         if (!skb)
1826                 return;
1827         msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));
1828
1829         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
1830          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
1831
1832         eth_broadcast_addr(msg->da);
1833         ether_addr_copy(msg->sa, addr);
1834         msg->len = htons(6);
1835         msg->dsap = 0;
1836         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
1837         msg->control = 0xaf;    /* XID response lsb.1111F101.
1838                                  * F=0 (no poll command; unsolicited frame) */
1839         msg->xid_info[0] = 0x81;        /* XID format identifier */
1840         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
1841         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
1842
1843         skb->dev = dev;
1844         skb->protocol = eth_type_trans(skb, dev);
1845         memset(skb->cb, 0, sizeof(skb->cb));
1846         netif_rx_ni(skb);
1847 }
1848 EXPORT_SYMBOL(cfg80211_send_layer2_update);