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 == IEEE80211_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 ieee80211_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 IEEE80211_BAND_2GHZ:
  76                 if (chan == 14)
  77                         return 2484;
  78                 else if (chan < 14)
  79                         return 2407 + chan * 5;
  80                 break;
  81         case IEEE80211_BAND_5GHZ:
  82                 if (chan >= 182 && chan <= 196)
  83                         return 4000 + chan * 5;
  84                 else
  85                         return 5000 + chan * 5;
  86                 break;
  87         case IEEE80211_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 ieee80211_band band;
 120         struct ieee80211_supported_band *sband;
 121         int i;
 122
 123         for (band = 0; band < IEEE80211_NUM_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 ieee80211_band band)
 141 {
 142         int i, want;
 143
 144         switch (band) {
 145         case IEEE80211_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 IEEE80211_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 IEEE80211_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 IEEE80211_NUM_BANDS:
 194                 WARN_ON(1);
 195                 break;
 196         }
 197 }
 198
 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 200 {
 201         enum ieee80211_band band;
 202
 203         for (band = 0; band < IEEE80211_NUM_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 > 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                 break;
 253         default:
 254                 break;
 255         }
 256
 257         switch (params->cipher) {
 258         case WLAN_CIPHER_SUITE_WEP40:
 259                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 260                         return -EINVAL;
 261                 break;
 262         case WLAN_CIPHER_SUITE_TKIP:
 263                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 264                         return -EINVAL;
 265                 break;
 266         case WLAN_CIPHER_SUITE_CCMP:
 267                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 268                         return -EINVAL;
 269                 break;
 270         case WLAN_CIPHER_SUITE_CCMP_256:
 271                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 272                         return -EINVAL;
 273                 break;
 274         case WLAN_CIPHER_SUITE_GCMP:
 275                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 276                         return -EINVAL;
 277                 break;
 278         case WLAN_CIPHER_SUITE_GCMP_256:
 279                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 280                         return -EINVAL;
 281                 break;
 282         case WLAN_CIPHER_SUITE_WEP104:
 283                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 284                         return -EINVAL;
 285                 break;
 286         case WLAN_CIPHER_SUITE_AES_CMAC:
 287                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 288                         return -EINVAL;
 289                 break;
 290         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 291                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 292                         return -EINVAL;
 293                 break;
 294         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 295                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 296                         return -EINVAL;
 297                 break;
 298         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 299                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 300                         return -EINVAL;
 301                 break;
 302         default:
 303                 /*
 304                  * We don't know anything about this algorithm,
 305                  * allow using it -- but the driver must check
 306                  * all parameters! We still check below whether
 307                  * or not the driver supports this algorithm,
 308                  * of course.
 309                  */
 310                 break;
 311         }
 312
 313         if (params->seq) {
 314                 switch (params->cipher) {
 315                 case WLAN_CIPHER_SUITE_WEP40:
 316                 case WLAN_CIPHER_SUITE_WEP104:
 317                         /* These ciphers do not use key sequence */
 318                         return -EINVAL;
 319                 case WLAN_CIPHER_SUITE_TKIP:
 320                 case WLAN_CIPHER_SUITE_CCMP:
 321                 case WLAN_CIPHER_SUITE_CCMP_256:
 322                 case WLAN_CIPHER_SUITE_GCMP:
 323                 case WLAN_CIPHER_SUITE_GCMP_256:
 324                 case WLAN_CIPHER_SUITE_AES_CMAC:
 325                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 326                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 327                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 328                         if (params->seq_len != 6)
 329                                 return -EINVAL;
 330                         break;
 331                 }
 332         }
 333
 334         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 335                 return -EINVAL;
 336
 337         return 0;
 338 }
 339
 340 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 341 {
 342         unsigned int hdrlen = 24;
 343
 344         if (ieee80211_is_data(fc)) {
 345                 if (ieee80211_has_a4(fc))
 346                         hdrlen = 30;
 347                 if (ieee80211_is_data_qos(fc)) {
 348                         hdrlen += IEEE80211_QOS_CTL_LEN;
 349                         if (ieee80211_has_order(fc))
 350                                 hdrlen += IEEE80211_HT_CTL_LEN;
 351                 }
 352                 goto out;
 353         }
 354
 355         if (ieee80211_is_mgmt(fc)) {
 356                 if (ieee80211_has_order(fc))
 357                         hdrlen += IEEE80211_HT_CTL_LEN;
 358                 goto out;
 359         }
 360
 361         if (ieee80211_is_ctl(fc)) {
 362                 /*
 363                  * ACK and CTS are 10 bytes, all others 16. To see how
 364                  * to get this condition consider
 365                  *   subtype mask:   0b0000000011110000 (0x00F0)
 366                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 367                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 368                  *   bits that matter:         ^^^      (0x00E0)
 369                  *   value of those: 0b0000000011000000 (0x00C0)
 370                  */
 371                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 372                         hdrlen = 10;
 373                 else
 374                         hdrlen = 16;
 375         }
 376 out:
 377         return hdrlen;
 378 }
 379 EXPORT_SYMBOL(ieee80211_hdrlen);
 380
 381 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 382 {
 383         const struct ieee80211_hdr *hdr =
 384                         (const struct ieee80211_hdr *)skb->data;
 385         unsigned int hdrlen;
 386
 387         if (unlikely(skb->len < 10))
 388                 return 0;
 389         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 390         if (unlikely(hdrlen > skb->len))
 391                 return 0;
 392         return hdrlen;
 393 }
 394 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 395
 396 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 397 {
 398         int ae = flags & MESH_FLAGS_AE;
 399         /* 802.11-2012, 8.2.4.7.3 */
 400         switch (ae) {
 401         default:
 402         case 0:
 403                 return 6;
 404         case MESH_FLAGS_AE_A4:
 405                 return 12;
 406         case MESH_FLAGS_AE_A5_A6:
 407                 return 18;
 408         }
 409 }
 410
 411 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 412 {
 413         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 414 }
 415 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 416
 417 static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr,
 418                                     const u8 *addr, enum nl80211_iftype iftype)
 419 {
 420         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 421         struct {
 422                 u8 hdr[ETH_ALEN] __aligned(2);
 423                 __be16 proto;
 424         } payload;
 425         struct ethhdr tmp;
 426         u16 hdrlen;
 427         u8 mesh_flags = 0;
 428
 429         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 430                 return -1;
 431
 432         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 433         if (skb->len < hdrlen + 8)
 434                 return -1;
 435
 436         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 437          * header
 438          * IEEE 802.11 address fields:
 439          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 440          *   0     0   DA    SA    BSSID n/a
 441          *   0     1   DA    BSSID SA    n/a
 442          *   1     0   BSSID SA    DA    n/a
 443          *   1     1   RA    TA    DA    SA
 444          */
 445         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 446         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 447
 448         if (iftype == NL80211_IFTYPE_MESH_POINT)
 449                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 450
 451         switch (hdr->frame_control &
 452                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 453         case cpu_to_le16(IEEE80211_FCTL_TODS):
 454                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 455                              iftype != NL80211_IFTYPE_AP_VLAN &&
 456                              iftype != NL80211_IFTYPE_P2P_GO))
 457                         return -1;
 458                 break;
 459         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 460                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 461                              iftype != NL80211_IFTYPE_MESH_POINT &&
 462                              iftype != NL80211_IFTYPE_AP_VLAN &&
 463                              iftype != NL80211_IFTYPE_STATION))
 464                         return -1;
 465                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 466                         if (mesh_flags & MESH_FLAGS_AE_A4)
 467                                 return -1;
 468                         if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
 469                                 skb_copy_bits(skb, hdrlen +
 470                                         offsetof(struct ieee80211s_hdr, eaddr1),
 471                                         tmp.h_dest, 2 * ETH_ALEN);
 472                         }
 473                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 474                 }
 475                 break;
 476         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 477                 if ((iftype != NL80211_IFTYPE_STATION &&
 478                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 479                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 480                     (is_multicast_ether_addr(tmp.h_dest) &&
 481                      ether_addr_equal(tmp.h_source, addr)))
 482                         return -1;
 483                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 484                         if (mesh_flags & MESH_FLAGS_AE_A5_A6)
 485                                 return -1;
 486                         if (mesh_flags & MESH_FLAGS_AE_A4)
 487                                 skb_copy_bits(skb, hdrlen +
 488                                         offsetof(struct ieee80211s_hdr, eaddr1),
 489                                         tmp.h_source, ETH_ALEN);
 490                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 491                 }
 492                 break;
 493         case cpu_to_le16(0):
 494                 if (iftype != NL80211_IFTYPE_ADHOC &&
 495                     iftype != NL80211_IFTYPE_STATION &&
 496                     iftype != NL80211_IFTYPE_OCB)
 497                                 return -1;
 498                 break;
 499         }
 500
 501         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 502         tmp.h_proto = payload.proto;
 503
 504         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 505                     tmp.h_proto != htons(ETH_P_AARP) &&
 506                     tmp.h_proto != htons(ETH_P_IPX)) ||
 507                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 508                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 509                  * replace EtherType */
 510                 hdrlen += ETH_ALEN + 2;
 511         else
 512                 tmp.h_proto = htons(skb->len);
 513
 514         pskb_pull(skb, hdrlen);
 515
 516         if (!ehdr)
 517                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 518         memcpy(ehdr, &tmp, sizeof(tmp));
 519
 520         return 0;
 521 }
 522
 523 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 524                            enum nl80211_iftype iftype)
 525 {
 526         return __ieee80211_data_to_8023(skb, NULL, addr, iftype);
 527 }
 528 EXPORT_SYMBOL(ieee80211_data_to_8023);
 529
 530 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 531                              enum nl80211_iftype iftype,
 532                              const u8 *bssid, bool qos)
 533 {
 534         struct ieee80211_hdr hdr;
 535         u16 hdrlen, ethertype;
 536         __le16 fc;
 537         const u8 *encaps_data;
 538         int encaps_len, skip_header_bytes;
 539         int nh_pos, h_pos;
 540         int head_need;
 541
 542         if (unlikely(skb->len < ETH_HLEN))
 543                 return -EINVAL;
 544
 545         nh_pos = skb_network_header(skb) - skb->data;
 546         h_pos = skb_transport_header(skb) - skb->data;
 547
 548         /* convert Ethernet header to proper 802.11 header (based on
 549          * operation mode) */
 550         ethertype = (skb->data[12] << 8) | skb->data[13];
 551         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 552
 553         switch (iftype) {
 554         case NL80211_IFTYPE_AP:
 555         case NL80211_IFTYPE_AP_VLAN:
 556         case NL80211_IFTYPE_P2P_GO:
 557                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 558                 /* DA BSSID SA */
 559                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 560                 memcpy(hdr.addr2, addr, ETH_ALEN);
 561                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 562                 hdrlen = 24;
 563                 break;
 564         case NL80211_IFTYPE_STATION:
 565         case NL80211_IFTYPE_P2P_CLIENT:
 566                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 567                 /* BSSID SA DA */
 568                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 569                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 570                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 571                 hdrlen = 24;
 572                 break;
 573         case NL80211_IFTYPE_OCB:
 574         case NL80211_IFTYPE_ADHOC:
 575                 /* DA SA BSSID */
 576                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 577                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 578                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 579                 hdrlen = 24;
 580                 break;
 581         default:
 582                 return -EOPNOTSUPP;
 583         }
 584
 585         if (qos) {
 586                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 587                 hdrlen += 2;
 588         }
 589
 590         hdr.frame_control = fc;
 591         hdr.duration_id = 0;
 592         hdr.seq_ctrl = 0;
 593
 594         skip_header_bytes = ETH_HLEN;
 595         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 596                 encaps_data = bridge_tunnel_header;
 597                 encaps_len = sizeof(bridge_tunnel_header);
 598                 skip_header_bytes -= 2;
 599         } else if (ethertype >= ETH_P_802_3_MIN) {
 600                 encaps_data = rfc1042_header;
 601                 encaps_len = sizeof(rfc1042_header);
 602                 skip_header_bytes -= 2;
 603         } else {
 604                 encaps_data = NULL;
 605                 encaps_len = 0;
 606         }
 607
 608         skb_pull(skb, skip_header_bytes);
 609         nh_pos -= skip_header_bytes;
 610         h_pos -= skip_header_bytes;
 611
 612         head_need = hdrlen + encaps_len - skb_headroom(skb);
 613
 614         if (head_need > 0 || skb_cloned(skb)) {
 615                 head_need = max(head_need, 0);
 616                 if (head_need)
 617                         skb_orphan(skb);
 618
 619                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 620                         return -ENOMEM;
 621
 622                 skb->truesize += head_need;
 623         }
 624
 625         if (encaps_data) {
 626                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 627                 nh_pos += encaps_len;
 628                 h_pos += encaps_len;
 629         }
 630
 631         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 632
 633         nh_pos += hdrlen;
 634         h_pos += hdrlen;
 635
 636         /* Update skb pointers to various headers since this modified frame
 637          * is going to go through Linux networking code that may potentially
 638          * need things like pointer to IP header. */
 639         skb_set_mac_header(skb, 0);
 640         skb_set_network_header(skb, nh_pos);
 641         skb_set_transport_header(skb, h_pos);
 642
 643         return 0;
 644 }
 645 EXPORT_SYMBOL(ieee80211_data_from_8023);
 646
 647 static struct sk_buff *
 648 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 649                        int offset, int len)
 650 {
 651         struct sk_buff *frame;
 652
 653         if (skb->len - offset < len)
 654                 return NULL;
 655
 656         /*
 657          * Allocate and reserve two bytes more for payload
 658          * alignment since sizeof(struct ethhdr) is 14.
 659          */
 660         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + len);
 661
 662         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 663         skb_copy_bits(skb, offset, skb_put(frame, len), len);
 664
 665         return frame;
 666 }
 667
 668 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 669                               const u8 *addr, enum nl80211_iftype iftype,
 670                               const unsigned int extra_headroom,
 671                               bool has_80211_header)
 672 {
 673         unsigned int hlen = ALIGN(extra_headroom, 4);
 674         struct sk_buff *frame = NULL;
 675         u16 ethertype;
 676         u8 *payload;
 677         int offset = 0, remaining, err;
 678         struct ethhdr eth;
 679         bool reuse_skb = true;
 680         bool last = false;
 681
 682         if (has_80211_header) {
 683                 err = __ieee80211_data_to_8023(skb, &eth, addr, iftype);
 684                 if (err)
 685                         goto out;
 686         }
 687
 688         while (!last) {
 689                 unsigned int subframe_len;
 690                 int len;
 691                 u8 padding;
 692
 693                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 694                 len = ntohs(eth.h_proto);
 695                 subframe_len = sizeof(struct ethhdr) + len;
 696                 padding = (4 - subframe_len) & 0x3;
 697
 698                 /* the last MSDU has no padding */
 699                 remaining = skb->len - offset;
 700                 if (subframe_len > remaining)
 701                         goto purge;
 702
 703                 offset += sizeof(struct ethhdr);
 704                 /* reuse skb for the last subframe */
 705                 last = remaining <= subframe_len + padding;
 706                 if (!skb_is_nonlinear(skb) && last) {
 707                         skb_pull(skb, offset);
 708                         frame = skb;
 709                         reuse_skb = true;
 710                 } else {
 711                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len);
 712                         if (!frame)
 713                                 goto purge;
 714
 715                         offset += len + padding;
 716                 }
 717
 718                 skb_reset_network_header(frame);
 719                 frame->dev = skb->dev;
 720                 frame->priority = skb->priority;
 721
 722                 payload = frame->data;
 723                 ethertype = (payload[6] << 8) | payload[7];
 724                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 725                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 726                            ether_addr_equal(payload, bridge_tunnel_header))) {
 727                         eth.h_proto = htons(ethertype);
 728                         skb_pull(frame, ETH_ALEN + 2);
 729                 }
 730
 731                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 732                 __skb_queue_tail(list, frame);
 733         }
 734
 735         if (!reuse_skb)
 736                 dev_kfree_skb(skb);
 737
 738         return;
 739
 740  purge:
 741         __skb_queue_purge(list);
 742  out:
 743         dev_kfree_skb(skb);
 744 }
 745 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 746
 747 /* Given a data frame determine the 802.1p/1d tag to use. */
 748 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 749                                     struct cfg80211_qos_map *qos_map)
 750 {
 751         unsigned int dscp;
 752         unsigned char vlan_priority;
 753
 754         /* skb->priority values from 256->263 are magic values to
 755          * directly indicate a specific 802.1d priority.  This is used
 756          * to allow 802.1d priority to be passed directly in from VLAN
 757          * tags, etc.
 758          */
 759         if (skb->priority >= 256 && skb->priority <= 263)
 760                 return skb->priority - 256;
 761
 762         if (skb_vlan_tag_present(skb)) {
 763                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 764                         >> VLAN_PRIO_SHIFT;
 765                 if (vlan_priority > 0)
 766                         return vlan_priority;
 767         }
 768
 769         switch (skb->protocol) {
 770         case htons(ETH_P_IP):
 771                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 772                 break;
 773         case htons(ETH_P_IPV6):
 774                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 775                 break;
 776         case htons(ETH_P_MPLS_UC):
 777         case htons(ETH_P_MPLS_MC): {
 778                 struct mpls_label mpls_tmp, *mpls;
 779
 780                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 781                                           sizeof(*mpls), &mpls_tmp);
 782                 if (!mpls)
 783                         return 0;
 784
 785                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 786                         >> MPLS_LS_TC_SHIFT;
 787         }
 788         case htons(ETH_P_80221):
 789                 /* 802.21 is always network control traffic */
 790                 return 7;
 791         default:
 792                 return 0;
 793         }
 794
 795         if (qos_map) {
 796                 unsigned int i, tmp_dscp = dscp >> 2;
 797
 798                 for (i = 0; i < qos_map->num_des; i++) {
 799                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 800                                 return qos_map->dscp_exception[i].up;
 801                 }
 802
 803                 for (i = 0; i < 8; i++) {
 804                         if (tmp_dscp >= qos_map->up[i].low &&
 805                             tmp_dscp <= qos_map->up[i].high)
 806                                 return i;
 807                 }
 808         }
 809
 810         return dscp >> 5;
 811 }
 812 EXPORT_SYMBOL(cfg80211_classify8021d);
 813
 814 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 815 {
 816         const struct cfg80211_bss_ies *ies;
 817
 818         ies = rcu_dereference(bss->ies);
 819         if (!ies)
 820                 return NULL;
 821
 822         return cfg80211_find_ie(ie, ies->data, ies->len);
 823 }
 824 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 825
 826 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 827 {
 828         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 829         struct net_device *dev = wdev->netdev;
 830         int i;
 831
 832         if (!wdev->connect_keys)
 833                 return;
 834
 835         for (i = 0; i < 6; i++) {
 836                 if (!wdev->connect_keys->params[i].cipher)
 837                         continue;
 838                 if (rdev_add_key(rdev, dev, i, false, NULL,
 839                                  &wdev->connect_keys->params[i])) {
 840                         netdev_err(dev, "failed to set key %d\n", i);
 841                         continue;
 842                 }
 843                 if (wdev->connect_keys->def == i)
 844                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 845                                 netdev_err(dev, "failed to set defkey %d\n", i);
 846                                 continue;
 847                         }
 848                 if (wdev->connect_keys->defmgmt == i)
 849                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 850                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 851         }
 852
 853         kzfree(wdev->connect_keys);
 854         wdev->connect_keys = NULL;
 855 }
 856
 857 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 858 {
 859         struct cfg80211_event *ev;
 860         unsigned long flags;
 861         const u8 *bssid = NULL;
 862
 863         spin_lock_irqsave(&wdev->event_lock, flags);
 864         while (!list_empty(&wdev->event_list)) {
 865                 ev = list_first_entry(&wdev->event_list,
 866                                       struct cfg80211_event, list);
 867                 list_del(&ev->list);
 868                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 869
 870                 wdev_lock(wdev);
 871                 switch (ev->type) {
 872                 case EVENT_CONNECT_RESULT:
 873                         if (!is_zero_ether_addr(ev->cr.bssid))
 874                                 bssid = ev->cr.bssid;
 875                         __cfg80211_connect_result(
 876                                 wdev->netdev, bssid,
 877                                 ev->cr.req_ie, ev->cr.req_ie_len,
 878                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 879                                 ev->cr.status,
 880                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 881                                 NULL);
 882                         break;
 883                 case EVENT_ROAMED:
 884                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 885                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 886                                           ev->rm.resp_ie_len);
 887                         break;
 888                 case EVENT_DISCONNECTED:
 889                         __cfg80211_disconnected(wdev->netdev,
 890                                                 ev->dc.ie, ev->dc.ie_len,
 891                                                 ev->dc.reason,
 892                                                 !ev->dc.locally_generated);
 893                         break;
 894                 case EVENT_IBSS_JOINED:
 895                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 896                                                ev->ij.channel);
 897                         break;
 898                 case EVENT_STOPPED:
 899                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 900                         break;
 901                 }
 902                 wdev_unlock(wdev);
 903
 904                 kfree(ev);
 905
 906                 spin_lock_irqsave(&wdev->event_lock, flags);
 907         }
 908         spin_unlock_irqrestore(&wdev->event_lock, flags);
 909 }
 910
 911 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 912 {
 913         struct wireless_dev *wdev;
 914
 915         ASSERT_RTNL();
 916
 917         list_for_each_entry(wdev, &rdev->wdev_list, list)
 918                 cfg80211_process_wdev_events(wdev);
 919 }
 920
 921 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 922                           struct net_device *dev, enum nl80211_iftype ntype,
 923                           u32 *flags, struct vif_params *params)
 924 {
 925         int err;
 926         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 927
 928         ASSERT_RTNL();
 929
 930         /* don't support changing VLANs, you just re-create them */
 931         if (otype == NL80211_IFTYPE_AP_VLAN)
 932                 return -EOPNOTSUPP;
 933
 934         /* cannot change into P2P device type */
 935         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 936                 return -EOPNOTSUPP;
 937
 938         if (!rdev->ops->change_virtual_intf ||
 939             !(rdev->wiphy.interface_modes & (1 << ntype)))
 940                 return -EOPNOTSUPP;
 941
 942         /* if it's part of a bridge, reject changing type to station/ibss */
 943         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 944             (ntype == NL80211_IFTYPE_ADHOC ||
 945              ntype == NL80211_IFTYPE_STATION ||
 946              ntype == NL80211_IFTYPE_P2P_CLIENT))
 947                 return -EBUSY;
 948
 949         if (ntype != otype) {
 950                 dev->ieee80211_ptr->use_4addr = false;
 951                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 952                 wdev_lock(dev->ieee80211_ptr);
 953                 rdev_set_qos_map(rdev, dev, NULL);
 954                 wdev_unlock(dev->ieee80211_ptr);
 955
 956                 switch (otype) {
 957                 case NL80211_IFTYPE_AP:
 958                         cfg80211_stop_ap(rdev, dev, true);
 959                         break;
 960                 case NL80211_IFTYPE_ADHOC:
 961                         cfg80211_leave_ibss(rdev, dev, false);
 962                         break;
 963                 case NL80211_IFTYPE_STATION:
 964                 case NL80211_IFTYPE_P2P_CLIENT:
 965                         wdev_lock(dev->ieee80211_ptr);
 966                         cfg80211_disconnect(rdev, dev,
 967                                             WLAN_REASON_DEAUTH_LEAVING, true);
 968                         wdev_unlock(dev->ieee80211_ptr);
 969                         break;
 970                 case NL80211_IFTYPE_MESH_POINT:
 971                         /* mesh should be handled? */
 972                         break;
 973                 default:
 974                         break;
 975                 }
 976
 977                 cfg80211_process_rdev_events(rdev);
 978         }
 979
 980         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 981
 982         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 983
 984         if (!err && params && params->use_4addr != -1)
 985                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 986
 987         if (!err) {
 988                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 989                 switch (ntype) {
 990                 case NL80211_IFTYPE_STATION:
 991                         if (dev->ieee80211_ptr->use_4addr)
 992                                 break;
 993                         /* fall through */
 994                 case NL80211_IFTYPE_OCB:
 995                 case NL80211_IFTYPE_P2P_CLIENT:
 996                 case NL80211_IFTYPE_ADHOC:
 997                         dev->priv_flags |= IFF_DONT_BRIDGE;
 998                         break;
 999                 case NL80211_IFTYPE_P2P_GO:
1000                 case NL80211_IFTYPE_AP:
1001                 case NL80211_IFTYPE_AP_VLAN:
1002                 case NL80211_IFTYPE_WDS:
1003                 case NL80211_IFTYPE_MESH_POINT:
1004                         /* bridging OK */
1005                         break;
1006                 case NL80211_IFTYPE_MONITOR:
1007                         /* monitor can't bridge anyway */
1008                         break;
1009                 case NL80211_IFTYPE_UNSPECIFIED:
1010                 case NUM_NL80211_IFTYPES:
1011                         /* not happening */
1012                         break;
1013                 case NL80211_IFTYPE_P2P_DEVICE:
1014                         WARN_ON(1);
1015                         break;
1016                 }
1017         }
1018
1019         if (!err && ntype != otype && netif_running(dev)) {
1020                 cfg80211_update_iface_num(rdev, ntype, 1);
1021                 cfg80211_update_iface_num(rdev, otype, -1);
1022         }
1023
1024         return err;
1025 }
1026
1027 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1028 {
1029         static const u32 __mcs2bitrate[] = {
1030                 /* control PHY */
1031                 [0] =   275,
1032                 /* SC PHY */
1033                 [1] =  3850,
1034                 [2] =  7700,
1035                 [3] =  9625,
1036                 [4] = 11550,
1037                 [5] = 12512, /* 1251.25 mbps */
1038                 [6] = 15400,
1039                 [7] = 19250,
1040                 [8] = 23100,
1041                 [9] = 25025,
1042                 [10] = 30800,
1043                 [11] = 38500,
1044                 [12] = 46200,
1045                 /* OFDM PHY */
1046                 [13] =  6930,
1047                 [14] =  8662, /* 866.25 mbps */
1048                 [15] = 13860,
1049                 [16] = 17325,
1050                 [17] = 20790,
1051                 [18] = 27720,
1052                 [19] = 34650,
1053                 [20] = 41580,
1054                 [21] = 45045,
1055                 [22] = 51975,
1056                 [23] = 62370,
1057                 [24] = 67568, /* 6756.75 mbps */
1058                 /* LP-SC PHY */
1059                 [25] =  6260,
1060                 [26] =  8340,
1061                 [27] = 11120,
1062                 [28] = 12510,
1063                 [29] = 16680,
1064                 [30] = 22240,
1065                 [31] = 25030,
1066         };
1067
1068         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1069                 return 0;
1070
1071         return __mcs2bitrate[rate->mcs];
1072 }
1073
1074 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1075 {
1076         static const u32 base[4][10] = {
1077                 {   6500000,
1078                    13000000,
1079                    19500000,
1080                    26000000,
1081                    39000000,
1082                    52000000,
1083                    58500000,
1084                    65000000,
1085                    78000000,
1086                    0,
1087                 },
1088                 {  13500000,
1089                    27000000,
1090                    40500000,
1091                    54000000,
1092                    81000000,
1093                   108000000,
1094                   121500000,
1095                   135000000,
1096                   162000000,
1097                   180000000,
1098                 },
1099                 {  29300000,
1100                    58500000,
1101                    87800000,
1102                   117000000,
1103                   175500000,
1104                   234000000,
1105                   263300000,
1106                   292500000,
1107                   351000000,
1108                   390000000,
1109                 },
1110                 {  58500000,
1111                   117000000,
1112                   175500000,
1113                   234000000,
1114                   351000000,
1115                   468000000,
1116                   526500000,
1117                   585000000,
1118                   702000000,
1119                   780000000,
1120                 },
1121         };
1122         u32 bitrate;
1123         int idx;
1124
1125         if (WARN_ON_ONCE(rate->mcs > 9))
1126                 return 0;
1127
1128         switch (rate->bw) {
1129         case RATE_INFO_BW_160:
1130                 idx = 3;
1131                 break;
1132         case RATE_INFO_BW_80:
1133                 idx = 2;
1134                 break;
1135         case RATE_INFO_BW_40:
1136                 idx = 1;
1137                 break;
1138         case RATE_INFO_BW_5:
1139         case RATE_INFO_BW_10:
1140         default:
1141                 WARN_ON(1);
1142                 /* fall through */
1143         case RATE_INFO_BW_20:
1144                 idx = 0;
1145         }
1146
1147         bitrate = base[idx][rate->mcs];
1148         bitrate *= rate->nss;
1149
1150         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1151                 bitrate = (bitrate / 9) * 10;
1152
1153         /* do NOT round down here */
1154         return (bitrate + 50000) / 100000;
1155 }
1156
1157 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1158 {
1159         int modulation, streams, bitrate;
1160
1161         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1162             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1163                 return rate->legacy;
1164         if (rate->flags & RATE_INFO_FLAGS_60G)
1165                 return cfg80211_calculate_bitrate_60g(rate);
1166         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1167                 return cfg80211_calculate_bitrate_vht(rate);
1168
1169         /* the formula below does only work for MCS values smaller than 32 */
1170         if (WARN_ON_ONCE(rate->mcs >= 32))
1171                 return 0;
1172
1173         modulation = rate->mcs & 7;
1174         streams = (rate->mcs >> 3) + 1;
1175
1176         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1177
1178         if (modulation < 4)
1179                 bitrate *= (modulation + 1);
1180         else if (modulation == 4)
1181                 bitrate *= (modulation + 2);
1182         else
1183                 bitrate *= (modulation + 3);
1184
1185         bitrate *= streams;
1186
1187         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1188                 bitrate = (bitrate / 9) * 10;
1189
1190         /* do NOT round down here */
1191         return (bitrate + 50000) / 100000;
1192 }
1193 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1194
1195 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1196                           enum ieee80211_p2p_attr_id attr,
1197                           u8 *buf, unsigned int bufsize)
1198 {
1199         u8 *out = buf;
1200         u16 attr_remaining = 0;
1201         bool desired_attr = false;
1202         u16 desired_len = 0;
1203
1204         while (len > 0) {
1205                 unsigned int iedatalen;
1206                 unsigned int copy;
1207                 const u8 *iedata;
1208
1209                 if (len < 2)
1210                         return -EILSEQ;
1211                 iedatalen = ies[1];
1212                 if (iedatalen + 2 > len)
1213                         return -EILSEQ;
1214
1215                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1216                         goto cont;
1217
1218                 if (iedatalen < 4)
1219                         goto cont;
1220
1221                 iedata = ies + 2;
1222
1223                 /* check WFA OUI, P2P subtype */
1224                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1225                     iedata[2] != 0x9a || iedata[3] != 0x09)
1226                         goto cont;
1227
1228                 iedatalen -= 4;
1229                 iedata += 4;
1230
1231                 /* check attribute continuation into this IE */
1232                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1233                 if (copy && desired_attr) {
1234                         desired_len += copy;
1235                         if (out) {
1236                                 memcpy(out, iedata, min(bufsize, copy));
1237                                 out += min(bufsize, copy);
1238                                 bufsize -= min(bufsize, copy);
1239                         }
1240
1241
1242                         if (copy == attr_remaining)
1243                                 return desired_len;
1244                 }
1245
1246                 attr_remaining -= copy;
1247                 if (attr_remaining)
1248                         goto cont;
1249
1250                 iedatalen -= copy;
1251                 iedata += copy;
1252
1253                 while (iedatalen > 0) {
1254                         u16 attr_len;
1255
1256                         /* P2P attribute ID & size must fit */
1257                         if (iedatalen < 3)
1258                                 return -EILSEQ;
1259                         desired_attr = iedata[0] == attr;
1260                         attr_len = get_unaligned_le16(iedata + 1);
1261                         iedatalen -= 3;
1262                         iedata += 3;
1263
1264                         copy = min_t(unsigned int, attr_len, iedatalen);
1265
1266                         if (desired_attr) {
1267                                 desired_len += copy;
1268                                 if (out) {
1269                                         memcpy(out, iedata, min(bufsize, copy));
1270                                         out += min(bufsize, copy);
1271                                         bufsize -= min(bufsize, copy);
1272                                 }
1273
1274                                 if (copy == attr_len)
1275                                         return desired_len;
1276                         }
1277
1278                         iedata += copy;
1279                         iedatalen -= copy;
1280                         attr_remaining = attr_len - copy;
1281                 }
1282
1283  cont:
1284                 len -= ies[1] + 2;
1285                 ies += ies[1] + 2;
1286         }
1287
1288         if (attr_remaining && desired_attr)
1289                 return -EILSEQ;
1290
1291         return -ENOENT;
1292 }
1293 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1294
1295 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1296 {
1297         int i;
1298
1299         for (i = 0; i < n_ids; i++)
1300                 if (ids[i] == id)
1301                         return true;
1302         return false;
1303 }
1304
1305 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1306                               const u8 *ids, int n_ids,
1307                               const u8 *after_ric, int n_after_ric,
1308                               size_t offset)
1309 {
1310         size_t pos = offset;
1311
1312         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1313                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1314                         pos += 2 + ies[pos + 1];
1315
1316                         while (pos < ielen &&
1317                                !ieee80211_id_in_list(after_ric, n_after_ric,
1318                                                      ies[pos]))
1319                                 pos += 2 + ies[pos + 1];
1320                 } else {
1321                         pos += 2 + ies[pos + 1];
1322                 }
1323         }
1324
1325         return pos;
1326 }
1327 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1328
1329 bool ieee80211_operating_class_to_band(u8 operating_class,
1330                                        enum ieee80211_band *band)
1331 {
1332         switch (operating_class) {
1333         case 112:
1334         case 115 ... 127:
1335         case 128 ... 130:
1336                 *band = IEEE80211_BAND_5GHZ;
1337                 return true;
1338         case 81:
1339         case 82:
1340         case 83:
1341         case 84:
1342                 *band = IEEE80211_BAND_2GHZ;
1343                 return true;
1344         case 180:
1345                 *band = IEEE80211_BAND_60GHZ;
1346                 return true;
1347         }
1348
1349         return false;
1350 }
1351 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1352
1353 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1354                                           u8 *op_class)
1355 {
1356         u8 vht_opclass;
1357         u16 freq = chandef->center_freq1;
1358
1359         if (freq >= 2412 && freq <= 2472) {
1360                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1361                         return false;
1362
1363                 /* 2.407 GHz, channels 1..13 */
1364                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1365                         if (freq > chandef->chan->center_freq)
1366                                 *op_class = 83; /* HT40+ */
1367                         else
1368                                 *op_class = 84; /* HT40- */
1369                 } else {
1370                         *op_class = 81;
1371                 }
1372
1373                 return true;
1374         }
1375
1376         if (freq == 2484) {
1377                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1378                         return false;
1379
1380                 *op_class = 82; /* channel 14 */
1381                 return true;
1382         }
1383
1384         switch (chandef->width) {
1385         case NL80211_CHAN_WIDTH_80:
1386                 vht_opclass = 128;
1387                 break;
1388         case NL80211_CHAN_WIDTH_160:
1389                 vht_opclass = 129;
1390                 break;
1391         case NL80211_CHAN_WIDTH_80P80:
1392                 vht_opclass = 130;
1393                 break;
1394         case NL80211_CHAN_WIDTH_10:
1395         case NL80211_CHAN_WIDTH_5:
1396                 return false; /* unsupported for now */
1397         default:
1398                 vht_opclass = 0;
1399                 break;
1400         }
1401
1402         /* 5 GHz, channels 36..48 */
1403         if (freq >= 5180 && freq <= 5240) {
1404                 if (vht_opclass) {
1405                         *op_class = vht_opclass;
1406                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1407                         if (freq > chandef->chan->center_freq)
1408                                 *op_class = 116;
1409                         else
1410                                 *op_class = 117;
1411                 } else {
1412                         *op_class = 115;
1413                 }
1414
1415                 return true;
1416         }
1417
1418         /* 5 GHz, channels 52..64 */
1419         if (freq >= 5260 && freq <= 5320) {
1420                 if (vht_opclass) {
1421                         *op_class = vht_opclass;
1422                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1423                         if (freq > chandef->chan->center_freq)
1424                                 *op_class = 119;
1425                         else
1426                                 *op_class = 120;
1427                 } else {
1428                         *op_class = 118;
1429                 }
1430
1431                 return true;
1432         }
1433
1434         /* 5 GHz, channels 100..144 */
1435         if (freq >= 5500 && freq <= 5720) {
1436                 if (vht_opclass) {
1437                         *op_class = vht_opclass;
1438                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1439                         if (freq > chandef->chan->center_freq)
1440                                 *op_class = 122;
1441                         else
1442                                 *op_class = 123;
1443                 } else {
1444                         *op_class = 121;
1445                 }
1446
1447                 return true;
1448         }
1449
1450         /* 5 GHz, channels 149..169 */
1451         if (freq >= 5745 && freq <= 5845) {
1452                 if (vht_opclass) {
1453                         *op_class = vht_opclass;
1454                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1455                         if (freq > chandef->chan->center_freq)
1456                                 *op_class = 126;
1457                         else
1458                                 *op_class = 127;
1459                 } else if (freq <= 5805) {
1460                         *op_class = 124;
1461                 } else {
1462                         *op_class = 125;
1463                 }
1464
1465                 return true;
1466         }
1467
1468         /* 56.16 GHz, channel 1..4 */
1469         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1470                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1471                         return false;
1472
1473                 *op_class = 180;
1474                 return true;
1475         }
1476
1477         /* not supported yet */
1478         return false;
1479 }
1480 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1481
1482 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1483                                  u32 beacon_int)
1484 {
1485         struct wireless_dev *wdev;
1486         int res = 0;
1487
1488         if (!beacon_int)
1489                 return -EINVAL;
1490
1491         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1492                 if (!wdev->beacon_interval)
1493                         continue;
1494                 if (wdev->beacon_interval != beacon_int) {
1495                         res = -EINVAL;
1496                         break;
1497                 }
1498         }
1499
1500         return res;
1501 }
1502
1503 int cfg80211_iter_combinations(struct wiphy *wiphy,
1504                                const int num_different_channels,
1505                                const u8 radar_detect,
1506                                const int iftype_num[NUM_NL80211_IFTYPES],
1507                                void (*iter)(const struct ieee80211_iface_combination *c,
1508                                             void *data),
1509                                void *data)
1510 {
1511         const struct ieee80211_regdomain *regdom;
1512         enum nl80211_dfs_regions region = 0;
1513         int i, j, iftype;
1514         int num_interfaces = 0;
1515         u32 used_iftypes = 0;
1516
1517         if (radar_detect) {
1518                 rcu_read_lock();
1519                 regdom = rcu_dereference(cfg80211_regdomain);
1520                 if (regdom)
1521                         region = regdom->dfs_region;
1522                 rcu_read_unlock();
1523         }
1524
1525         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1526                 num_interfaces += iftype_num[iftype];
1527                 if (iftype_num[iftype] > 0 &&
1528                     !(wiphy->software_iftypes & BIT(iftype)))
1529                         used_iftypes |= BIT(iftype);
1530         }
1531
1532         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1533                 const struct ieee80211_iface_combination *c;
1534                 struct ieee80211_iface_limit *limits;
1535                 u32 all_iftypes = 0;
1536
1537                 c = &wiphy->iface_combinations[i];
1538
1539                 if (num_interfaces > c->max_interfaces)
1540                         continue;
1541                 if (num_different_channels > c->num_different_channels)
1542                         continue;
1543
1544                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1545                                  GFP_KERNEL);
1546                 if (!limits)
1547                         return -ENOMEM;
1548
1549                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1550                         if (wiphy->software_iftypes & BIT(iftype))
1551                                 continue;
1552                         for (j = 0; j < c->n_limits; j++) {
1553                                 all_iftypes |= limits[j].types;
1554                                 if (!(limits[j].types & BIT(iftype)))
1555                                         continue;
1556                                 if (limits[j].max < iftype_num[iftype])
1557                                         goto cont;
1558                                 limits[j].max -= iftype_num[iftype];
1559                         }
1560                 }
1561
1562                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1563                         goto cont;
1564
1565                 if (radar_detect && c->radar_detect_regions &&
1566                     !(c->radar_detect_regions & BIT(region)))
1567                         goto cont;
1568
1569                 /* Finally check that all iftypes that we're currently
1570                  * using are actually part of this combination. If they
1571                  * aren't then we can't use this combination and have
1572                  * to continue to the next.
1573                  */
1574                 if ((all_iftypes & used_iftypes) != used_iftypes)
1575                         goto cont;
1576
1577                 /* This combination covered all interface types and
1578                  * supported the requested numbers, so we're good.
1579                  */
1580
1581                 (*iter)(c, data);
1582  cont:
1583                 kfree(limits);
1584         }
1585
1586         return 0;
1587 }
1588 EXPORT_SYMBOL(cfg80211_iter_combinations);
1589
1590 static void
1591 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1592                           void *data)
1593 {
1594         int *num = data;
1595         (*num)++;
1596 }
1597
1598 int cfg80211_check_combinations(struct wiphy *wiphy,
1599                                 const int num_different_channels,
1600                                 const u8 radar_detect,
1601                                 const int iftype_num[NUM_NL80211_IFTYPES])
1602 {
1603         int err, num = 0;
1604
1605         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1606                                          radar_detect, iftype_num,
1607                                          cfg80211_iter_sum_ifcombs, &num);
1608         if (err)
1609                 return err;
1610         if (num == 0)
1611                 return -EBUSY;
1612
1613         return 0;
1614 }
1615 EXPORT_SYMBOL(cfg80211_check_combinations);
1616
1617 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1618                            const u8 *rates, unsigned int n_rates,
1619                            u32 *mask)
1620 {
1621         int i, j;
1622
1623         if (!sband)
1624                 return -EINVAL;
1625
1626         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1627                 return -EINVAL;
1628
1629         *mask = 0;
1630
1631         for (i = 0; i < n_rates; i++) {
1632                 int rate = (rates[i] & 0x7f) * 5;
1633                 bool found = false;
1634
1635                 for (j = 0; j < sband->n_bitrates; j++) {
1636                         if (sband->bitrates[j].bitrate == rate) {
1637                                 found = true;
1638                                 *mask |= BIT(j);
1639                                 break;
1640                         }
1641                 }
1642                 if (!found)
1643                         return -EINVAL;
1644         }
1645
1646         /*
1647          * mask must have at least one bit set here since we
1648          * didn't accept a 0-length rates array nor allowed
1649          * entries in the array that didn't exist
1650          */
1651
1652         return 0;
1653 }
1654
1655 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1656 {
1657         enum ieee80211_band band;
1658         unsigned int n_channels = 0;
1659
1660         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1661                 if (wiphy->bands[band])
1662                         n_channels += wiphy->bands[band]->n_channels;
1663
1664         return n_channels;
1665 }
1666 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1667
1668 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1669                          struct station_info *sinfo)
1670 {
1671         struct cfg80211_registered_device *rdev;
1672         struct wireless_dev *wdev;
1673
1674         wdev = dev->ieee80211_ptr;
1675         if (!wdev)
1676                 return -EOPNOTSUPP;
1677
1678         rdev = wiphy_to_rdev(wdev->wiphy);
1679         if (!rdev->ops->get_station)
1680                 return -EOPNOTSUPP;
1681
1682         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1683 }
1684 EXPORT_SYMBOL(cfg80211_get_station);
1685
1686 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1687 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1688 const unsigned char rfc1042_header[] __aligned(2) =
1689         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1690 EXPORT_SYMBOL(rfc1042_header);
1691
1692 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1693 const unsigned char bridge_tunnel_header[] __aligned(2) =
1694         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1695 EXPORT_SYMBOL(bridge_tunnel_header);