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 <linux/gcd.h>
  17 #include "core.h"
  18 #include "rdev-ops.h"
  19
  20
  21 struct ieee80211_rate *
  22 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  23                             u32 basic_rates, int bitrate)
  24 {
  25         struct ieee80211_rate *result = &sband->bitrates[0];
  26         int i;
  27
  28         for (i = 0; i < sband->n_bitrates; i++) {
  29                 if (!(basic_rates & BIT(i)))
  30                         continue;
  31                 if (sband->bitrates[i].bitrate > bitrate)
  32                         continue;
  33                 result = &sband->bitrates[i];
  34         }
  35
  36         return result;
  37 }
  38 EXPORT_SYMBOL(ieee80211_get_response_rate);
  39
  40 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  41                               enum nl80211_bss_scan_width scan_width)
  42 {
  43         struct ieee80211_rate *bitrates;
  44         u32 mandatory_rates = 0;
  45         enum ieee80211_rate_flags mandatory_flag;
  46         int i;
  47
  48         if (WARN_ON(!sband))
  49                 return 1;
  50
  51         if (sband->band == NL80211_BAND_2GHZ) {
  52                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  53                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  54                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  55                 else
  56                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  57         } else {
  58                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  59         }
  60
  61         bitrates = sband->bitrates;
  62         for (i = 0; i < sband->n_bitrates; i++)
  63                 if (bitrates[i].flags & mandatory_flag)
  64                         mandatory_rates |= BIT(i);
  65         return mandatory_rates;
  66 }
  67 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  68
  69 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  70 {
  71         /* see 802.11 17.3.8.3.2 and Annex J
  72          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  73         if (chan <= 0)
  74                 return 0; /* not supported */
  75         switch (band) {
  76         case NL80211_BAND_2GHZ:
  77                 if (chan == 14)
  78                         return 2484;
  79                 else if (chan < 14)
  80                         return 2407 + chan * 5;
  81                 break;
  82         case NL80211_BAND_5GHZ:
  83                 if (chan >= 182 && chan <= 196)
  84                         return 4000 + chan * 5;
  85                 else
  86                         return 5000 + chan * 5;
  87                 break;
  88         case NL80211_BAND_60GHZ:
  89                 if (chan < 5)
  90                         return 56160 + chan * 2160;
  91                 break;
  92         default:
  93                 ;
  94         }
  95         return 0; /* not supported */
  96 }
  97 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  98
  99 int ieee80211_frequency_to_channel(int freq)
 100 {
 101         /* see 802.11 17.3.8.3.2 and Annex J */
 102         if (freq == 2484)
 103                 return 14;
 104         else if (freq < 2484)
 105                 return (freq - 2407) / 5;
 106         else if (freq >= 4910 && freq <= 4980)
 107                 return (freq - 4000) / 5;
 108         else if (freq <= 45000) /* DMG band lower limit */
 109                 return (freq - 5000) / 5;
 110         else if (freq >= 58320 && freq <= 64800)
 111                 return (freq - 56160) / 2160;
 112         else
 113                 return 0;
 114 }
 115 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 116
 117 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 118                                                   int freq)
 119 {
 120         enum nl80211_band band;
 121         struct ieee80211_supported_band *sband;
 122         int i;
 123
 124         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 125                 sband = wiphy->bands[band];
 126
 127                 if (!sband)
 128                         continue;
 129
 130                 for (i = 0; i < sband->n_channels; i++) {
 131                         if (sband->channels[i].center_freq == freq)
 132                                 return &sband->channels[i];
 133                 }
 134         }
 135
 136         return NULL;
 137 }
 138 EXPORT_SYMBOL(__ieee80211_get_channel);
 139
 140 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 141                                      enum nl80211_band band)
 142 {
 143         int i, want;
 144
 145         switch (band) {
 146         case NL80211_BAND_5GHZ:
 147                 want = 3;
 148                 for (i = 0; i < sband->n_bitrates; i++) {
 149                         if (sband->bitrates[i].bitrate == 60 ||
 150                             sband->bitrates[i].bitrate == 120 ||
 151                             sband->bitrates[i].bitrate == 240) {
 152                                 sband->bitrates[i].flags |=
 153                                         IEEE80211_RATE_MANDATORY_A;
 154                                 want--;
 155                         }
 156                 }
 157                 WARN_ON(want);
 158                 break;
 159         case NL80211_BAND_2GHZ:
 160                 want = 7;
 161                 for (i = 0; i < sband->n_bitrates; i++) {
 162                         if (sband->bitrates[i].bitrate == 10) {
 163                                 sband->bitrates[i].flags |=
 164                                         IEEE80211_RATE_MANDATORY_B |
 165                                         IEEE80211_RATE_MANDATORY_G;
 166                                 want--;
 167                         }
 168
 169                         if (sband->bitrates[i].bitrate == 20 ||
 170                             sband->bitrates[i].bitrate == 55 ||
 171                             sband->bitrates[i].bitrate == 110 ||
 172                             sband->bitrates[i].bitrate == 60 ||
 173                             sband->bitrates[i].bitrate == 120 ||
 174                             sband->bitrates[i].bitrate == 240) {
 175                                 sband->bitrates[i].flags |=
 176                                         IEEE80211_RATE_MANDATORY_G;
 177                                 want--;
 178                         }
 179
 180                         if (sband->bitrates[i].bitrate != 10 &&
 181                             sband->bitrates[i].bitrate != 20 &&
 182                             sband->bitrates[i].bitrate != 55 &&
 183                             sband->bitrates[i].bitrate != 110)
 184                                 sband->bitrates[i].flags |=
 185                                         IEEE80211_RATE_ERP_G;
 186                 }
 187                 WARN_ON(want != 0 && want != 3 && want != 6);
 188                 break;
 189         case NL80211_BAND_60GHZ:
 190                 /* check for mandatory HT MCS 1..4 */
 191                 WARN_ON(!sband->ht_cap.ht_supported);
 192                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 193                 break;
 194         case NUM_NL80211_BANDS:
 195                 WARN_ON(1);
 196                 break;
 197         }
 198 }
 199
 200 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 201 {
 202         enum nl80211_band band;
 203
 204         for (band = 0; band < NUM_NL80211_BANDS; band++)
 205                 if (wiphy->bands[band])
 206                         set_mandatory_flags_band(wiphy->bands[band], band);
 207 }
 208
 209 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 210 {
 211         int i;
 212         for (i = 0; i < wiphy->n_cipher_suites; i++)
 213                 if (cipher == wiphy->cipher_suites[i])
 214                         return true;
 215         return false;
 216 }
 217
 218 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 219                                    struct key_params *params, int key_idx,
 220                                    bool pairwise, const u8 *mac_addr)
 221 {
 222         if (key_idx < 0 || key_idx > 5)
 223                 return -EINVAL;
 224
 225         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 226                 return -EINVAL;
 227
 228         if (pairwise && !mac_addr)
 229                 return -EINVAL;
 230
 231         switch (params->cipher) {
 232         case WLAN_CIPHER_SUITE_TKIP:
 233         case WLAN_CIPHER_SUITE_CCMP:
 234         case WLAN_CIPHER_SUITE_CCMP_256:
 235         case WLAN_CIPHER_SUITE_GCMP:
 236         case WLAN_CIPHER_SUITE_GCMP_256:
 237                 /* Disallow pairwise keys with non-zero index unless it's WEP
 238                  * or a vendor specific cipher (because current deployments use
 239                  * pairwise WEP keys with non-zero indices and for vendor
 240                  * specific ciphers this should be validated in the driver or
 241                  * hardware level - but 802.11i clearly specifies to use zero)
 242                  */
 243                 if (pairwise && key_idx)
 244                         return -EINVAL;
 245                 break;
 246         case WLAN_CIPHER_SUITE_AES_CMAC:
 247         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 248         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 249         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 250                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 251                 if (pairwise)
 252                         return -EINVAL;
 253                 if (key_idx < 4)
 254                         return -EINVAL;
 255                 break;
 256         case WLAN_CIPHER_SUITE_WEP40:
 257         case WLAN_CIPHER_SUITE_WEP104:
 258                 if (key_idx > 3)
 259                         return -EINVAL;
 260         default:
 261                 break;
 262         }
 263
 264         switch (params->cipher) {
 265         case WLAN_CIPHER_SUITE_WEP40:
 266                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 267                         return -EINVAL;
 268                 break;
 269         case WLAN_CIPHER_SUITE_TKIP:
 270                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 271                         return -EINVAL;
 272                 break;
 273         case WLAN_CIPHER_SUITE_CCMP:
 274                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 275                         return -EINVAL;
 276                 break;
 277         case WLAN_CIPHER_SUITE_CCMP_256:
 278                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 279                         return -EINVAL;
 280                 break;
 281         case WLAN_CIPHER_SUITE_GCMP:
 282                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 283                         return -EINVAL;
 284                 break;
 285         case WLAN_CIPHER_SUITE_GCMP_256:
 286                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 287                         return -EINVAL;
 288                 break;
 289         case WLAN_CIPHER_SUITE_WEP104:
 290                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 291                         return -EINVAL;
 292                 break;
 293         case WLAN_CIPHER_SUITE_AES_CMAC:
 294                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 295                         return -EINVAL;
 296                 break;
 297         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 298                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 299                         return -EINVAL;
 300                 break;
 301         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 302                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 303                         return -EINVAL;
 304                 break;
 305         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 306                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 307                         return -EINVAL;
 308                 break;
 309         default:
 310                 /*
 311                  * We don't know anything about this algorithm,
 312                  * allow using it -- but the driver must check
 313                  * all parameters! We still check below whether
 314                  * or not the driver supports this algorithm,
 315                  * of course.
 316                  */
 317                 break;
 318         }
 319
 320         if (params->seq) {
 321                 switch (params->cipher) {
 322                 case WLAN_CIPHER_SUITE_WEP40:
 323                 case WLAN_CIPHER_SUITE_WEP104:
 324                         /* These ciphers do not use key sequence */
 325                         return -EINVAL;
 326                 case WLAN_CIPHER_SUITE_TKIP:
 327                 case WLAN_CIPHER_SUITE_CCMP:
 328                 case WLAN_CIPHER_SUITE_CCMP_256:
 329                 case WLAN_CIPHER_SUITE_GCMP:
 330                 case WLAN_CIPHER_SUITE_GCMP_256:
 331                 case WLAN_CIPHER_SUITE_AES_CMAC:
 332                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 333                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 334                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 335                         if (params->seq_len != 6)
 336                                 return -EINVAL;
 337                         break;
 338                 }
 339         }
 340
 341         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 342                 return -EINVAL;
 343
 344         return 0;
 345 }
 346
 347 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 348 {
 349         unsigned int hdrlen = 24;
 350
 351         if (ieee80211_is_data(fc)) {
 352                 if (ieee80211_has_a4(fc))
 353                         hdrlen = 30;
 354                 if (ieee80211_is_data_qos(fc)) {
 355                         hdrlen += IEEE80211_QOS_CTL_LEN;
 356                         if (ieee80211_has_order(fc))
 357                                 hdrlen += IEEE80211_HT_CTL_LEN;
 358                 }
 359                 goto out;
 360         }
 361
 362         if (ieee80211_is_mgmt(fc)) {
 363                 if (ieee80211_has_order(fc))
 364                         hdrlen += IEEE80211_HT_CTL_LEN;
 365                 goto out;
 366         }
 367
 368         if (ieee80211_is_ctl(fc)) {
 369                 /*
 370                  * ACK and CTS are 10 bytes, all others 16. To see how
 371                  * to get this condition consider
 372                  *   subtype mask:   0b0000000011110000 (0x00F0)
 373                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 374                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 375                  *   bits that matter:         ^^^      (0x00E0)
 376                  *   value of those: 0b0000000011000000 (0x00C0)
 377                  */
 378                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 379                         hdrlen = 10;
 380                 else
 381                         hdrlen = 16;
 382         }
 383 out:
 384         return hdrlen;
 385 }
 386 EXPORT_SYMBOL(ieee80211_hdrlen);
 387
 388 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 389 {
 390         const struct ieee80211_hdr *hdr =
 391                         (const struct ieee80211_hdr *)skb->data;
 392         unsigned int hdrlen;
 393
 394         if (unlikely(skb->len < 10))
 395                 return 0;
 396         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 397         if (unlikely(hdrlen > skb->len))
 398                 return 0;
 399         return hdrlen;
 400 }
 401 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 402
 403 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 404 {
 405         int ae = flags & MESH_FLAGS_AE;
 406         /* 802.11-2012, 8.2.4.7.3 */
 407         switch (ae) {
 408         default:
 409         case 0:
 410                 return 6;
 411         case MESH_FLAGS_AE_A4:
 412                 return 12;
 413         case MESH_FLAGS_AE_A5_A6:
 414                 return 18;
 415         }
 416 }
 417
 418 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 419 {
 420         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 421 }
 422 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 423
 424 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 425                                   const u8 *addr, enum nl80211_iftype iftype)
 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         switch (hdr->frame_control &
 459                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 460         case cpu_to_le16(IEEE80211_FCTL_TODS):
 461                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 462                              iftype != NL80211_IFTYPE_AP_VLAN &&
 463                              iftype != NL80211_IFTYPE_P2P_GO))
 464                         return -1;
 465                 break;
 466         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 467                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 468                              iftype != NL80211_IFTYPE_MESH_POINT &&
 469                              iftype != NL80211_IFTYPE_AP_VLAN &&
 470                              iftype != NL80211_IFTYPE_STATION))
 471                         return -1;
 472                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 473                         if (mesh_flags & MESH_FLAGS_AE_A4)
 474                                 return -1;
 475                         if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
 476                                 skb_copy_bits(skb, hdrlen +
 477                                         offsetof(struct ieee80211s_hdr, eaddr1),
 478                                         tmp.h_dest, 2 * ETH_ALEN);
 479                         }
 480                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 481                 }
 482                 break;
 483         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 484                 if ((iftype != NL80211_IFTYPE_STATION &&
 485                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 486                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 487                     (is_multicast_ether_addr(tmp.h_dest) &&
 488                      ether_addr_equal(tmp.h_source, addr)))
 489                         return -1;
 490                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 491                         if (mesh_flags & MESH_FLAGS_AE_A5_A6)
 492                                 return -1;
 493                         if (mesh_flags & MESH_FLAGS_AE_A4)
 494                                 skb_copy_bits(skb, hdrlen +
 495                                         offsetof(struct ieee80211s_hdr, eaddr1),
 496                                         tmp.h_source, ETH_ALEN);
 497                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 498                 }
 499                 break;
 500         case cpu_to_le16(0):
 501                 if (iftype != NL80211_IFTYPE_ADHOC &&
 502                     iftype != NL80211_IFTYPE_STATION &&
 503                     iftype != NL80211_IFTYPE_OCB)
 504                                 return -1;
 505                 break;
 506         }
 507
 508         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 509         tmp.h_proto = payload.proto;
 510
 511         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 512                     tmp.h_proto != htons(ETH_P_AARP) &&
 513                     tmp.h_proto != htons(ETH_P_IPX)) ||
 514                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 515                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 516                  * replace EtherType */
 517                 hdrlen += ETH_ALEN + 2;
 518         else
 519                 tmp.h_proto = htons(skb->len - hdrlen);
 520
 521         pskb_pull(skb, hdrlen);
 522
 523         if (!ehdr)
 524                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 525         memcpy(ehdr, &tmp, sizeof(tmp));
 526
 527         return 0;
 528 }
 529 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 530
 531 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 532                              enum nl80211_iftype iftype,
 533                              const u8 *bssid, bool qos)
 534 {
 535         struct ieee80211_hdr hdr;
 536         u16 hdrlen, ethertype;
 537         __le16 fc;
 538         const u8 *encaps_data;
 539         int encaps_len, skip_header_bytes;
 540         int nh_pos, h_pos;
 541         int head_need;
 542
 543         if (unlikely(skb->len < ETH_HLEN))
 544                 return -EINVAL;
 545
 546         nh_pos = skb_network_header(skb) - skb->data;
 547         h_pos = skb_transport_header(skb) - skb->data;
 548
 549         /* convert Ethernet header to proper 802.11 header (based on
 550          * operation mode) */
 551         ethertype = (skb->data[12] << 8) | skb->data[13];
 552         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 553
 554         switch (iftype) {
 555         case NL80211_IFTYPE_AP:
 556         case NL80211_IFTYPE_AP_VLAN:
 557         case NL80211_IFTYPE_P2P_GO:
 558                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 559                 /* DA BSSID SA */
 560                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 561                 memcpy(hdr.addr2, addr, ETH_ALEN);
 562                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 563                 hdrlen = 24;
 564                 break;
 565         case NL80211_IFTYPE_STATION:
 566         case NL80211_IFTYPE_P2P_CLIENT:
 567                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 568                 /* BSSID SA DA */
 569                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 570                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 571                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 572                 hdrlen = 24;
 573                 break;
 574         case NL80211_IFTYPE_OCB:
 575         case NL80211_IFTYPE_ADHOC:
 576                 /* DA SA BSSID */
 577                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 578                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 579                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 580                 hdrlen = 24;
 581                 break;
 582         default:
 583                 return -EOPNOTSUPP;
 584         }
 585
 586         if (qos) {
 587                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 588                 hdrlen += 2;
 589         }
 590
 591         hdr.frame_control = fc;
 592         hdr.duration_id = 0;
 593         hdr.seq_ctrl = 0;
 594
 595         skip_header_bytes = ETH_HLEN;
 596         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 597                 encaps_data = bridge_tunnel_header;
 598                 encaps_len = sizeof(bridge_tunnel_header);
 599                 skip_header_bytes -= 2;
 600         } else if (ethertype >= ETH_P_802_3_MIN) {
 601                 encaps_data = rfc1042_header;
 602                 encaps_len = sizeof(rfc1042_header);
 603                 skip_header_bytes -= 2;
 604         } else {
 605                 encaps_data = NULL;
 606                 encaps_len = 0;
 607         }
 608
 609         skb_pull(skb, skip_header_bytes);
 610         nh_pos -= skip_header_bytes;
 611         h_pos -= skip_header_bytes;
 612
 613         head_need = hdrlen + encaps_len - skb_headroom(skb);
 614
 615         if (head_need > 0 || skb_cloned(skb)) {
 616                 head_need = max(head_need, 0);
 617                 if (head_need)
 618                         skb_orphan(skb);
 619
 620                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 621                         return -ENOMEM;
 622
 623                 skb->truesize += head_need;
 624         }
 625
 626         if (encaps_data) {
 627                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 628                 nh_pos += encaps_len;
 629                 h_pos += encaps_len;
 630         }
 631
 632         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 633
 634         nh_pos += hdrlen;
 635         h_pos += hdrlen;
 636
 637         /* Update skb pointers to various headers since this modified frame
 638          * is going to go through Linux networking code that may potentially
 639          * need things like pointer to IP header. */
 640         skb_reset_mac_header(skb);
 641         skb_set_network_header(skb, nh_pos);
 642         skb_set_transport_header(skb, h_pos);
 643
 644         return 0;
 645 }
 646 EXPORT_SYMBOL(ieee80211_data_from_8023);
 647
 648 static void
 649 __frame_add_frag(struct sk_buff *skb, struct page *page,
 650                  void *ptr, int len, int size)
 651 {
 652         struct skb_shared_info *sh = skb_shinfo(skb);
 653         int page_offset;
 654
 655         page_ref_inc(page);
 656         page_offset = ptr - page_address(page);
 657         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 658 }
 659
 660 static void
 661 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 662                             int offset, int len)
 663 {
 664         struct skb_shared_info *sh = skb_shinfo(skb);
 665         const skb_frag_t *frag = &sh->frags[-1];
 666         struct page *frag_page;
 667         void *frag_ptr;
 668         int frag_len, frag_size;
 669         int head_size = skb->len - skb->data_len;
 670         int cur_len;
 671
 672         frag_page = virt_to_head_page(skb->head);
 673         frag_ptr = skb->data;
 674         frag_size = head_size;
 675
 676         while (offset >= frag_size) {
 677                 offset -= frag_size;
 678                 frag++;
 679                 frag_page = skb_frag_page(frag);
 680                 frag_ptr = skb_frag_address(frag);
 681                 frag_size = skb_frag_size(frag);
 682         }
 683
 684         frag_ptr += offset;
 685         frag_len = frag_size - offset;
 686
 687         cur_len = min(len, frag_len);
 688
 689         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 690         len -= cur_len;
 691
 692         while (len > 0) {
 693                 frag++;
 694                 frag_len = skb_frag_size(frag);
 695                 cur_len = min(len, frag_len);
 696                 __frame_add_frag(frame, skb_frag_page(frag),
 697                                  skb_frag_address(frag), cur_len, frag_len);
 698                 len -= cur_len;
 699         }
 700 }
 701
 702 static struct sk_buff *
 703 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 704                        int offset, int len, bool reuse_frag)
 705 {
 706         struct sk_buff *frame;
 707         int cur_len = len;
 708
 709         if (skb->len - offset < len)
 710                 return NULL;
 711
 712         /*
 713          * When reusing framents, copy some data to the head to simplify
 714          * ethernet header handling and speed up protocol header processing
 715          * in the stack later.
 716          */
 717         if (reuse_frag)
 718                 cur_len = min_t(int, len, 32);
 719
 720         /*
 721          * Allocate and reserve two bytes more for payload
 722          * alignment since sizeof(struct ethhdr) is 14.
 723          */
 724         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 725         if (!frame)
 726                 return NULL;
 727
 728         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 729         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 730
 731         len -= cur_len;
 732         if (!len)
 733                 return frame;
 734
 735         offset += cur_len;
 736         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 737
 738         return frame;
 739 }
 740
 741 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 742                               const u8 *addr, enum nl80211_iftype iftype,
 743                               const unsigned int extra_headroom,
 744                               const u8 *check_da, const u8 *check_sa)
 745 {
 746         unsigned int hlen = ALIGN(extra_headroom, 4);
 747         struct sk_buff *frame = NULL;
 748         u16 ethertype;
 749         u8 *payload;
 750         int offset = 0, remaining;
 751         struct ethhdr eth;
 752         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 753         bool reuse_skb = false;
 754         bool last = false;
 755
 756         while (!last) {
 757                 unsigned int subframe_len;
 758                 int len;
 759                 u8 padding;
 760
 761                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 762                 len = ntohs(eth.h_proto);
 763                 subframe_len = sizeof(struct ethhdr) + len;
 764                 padding = (4 - subframe_len) & 0x3;
 765
 766                 /* the last MSDU has no padding */
 767                 remaining = skb->len - offset;
 768                 if (subframe_len > remaining)
 769                         goto purge;
 770
 771                 offset += sizeof(struct ethhdr);
 772                 last = remaining <= subframe_len + padding;
 773
 774                 /* FIXME: should we really accept multicast DA? */
 775                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 776                      !ether_addr_equal(check_da, eth.h_dest)) ||
 777                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 778                         offset += len + padding;
 779                         continue;
 780                 }
 781
 782                 /* reuse skb for the last subframe */
 783                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 784                         skb_pull(skb, offset);
 785                         frame = skb;
 786                         reuse_skb = true;
 787                 } else {
 788                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 789                                                        reuse_frag);
 790                         if (!frame)
 791                                 goto purge;
 792
 793                         offset += len + padding;
 794                 }
 795
 796                 skb_reset_network_header(frame);
 797                 frame->dev = skb->dev;
 798                 frame->priority = skb->priority;
 799
 800                 payload = frame->data;
 801                 ethertype = (payload[6] << 8) | payload[7];
 802                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 803                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 804                            ether_addr_equal(payload, bridge_tunnel_header))) {
 805                         eth.h_proto = htons(ethertype);
 806                         skb_pull(frame, ETH_ALEN + 2);
 807                 }
 808
 809                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 810                 __skb_queue_tail(list, frame);
 811         }
 812
 813         if (!reuse_skb)
 814                 dev_kfree_skb(skb);
 815
 816         return;
 817
 818  purge:
 819         __skb_queue_purge(list);
 820         dev_kfree_skb(skb);
 821 }
 822 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 823
 824 /* Given a data frame determine the 802.1p/1d tag to use. */
 825 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 826                                     struct cfg80211_qos_map *qos_map)
 827 {
 828         unsigned int dscp;
 829         unsigned char vlan_priority;
 830
 831         /* skb->priority values from 256->263 are magic values to
 832          * directly indicate a specific 802.1d priority.  This is used
 833          * to allow 802.1d priority to be passed directly in from VLAN
 834          * tags, etc.
 835          */
 836         if (skb->priority >= 256 && skb->priority <= 263)
 837                 return skb->priority - 256;
 838
 839         if (skb_vlan_tag_present(skb)) {
 840                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 841                         >> VLAN_PRIO_SHIFT;
 842                 if (vlan_priority > 0)
 843                         return vlan_priority;
 844         }
 845
 846         switch (skb->protocol) {
 847         case htons(ETH_P_IP):
 848                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 849                 break;
 850         case htons(ETH_P_IPV6):
 851                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 852                 break;
 853         case htons(ETH_P_MPLS_UC):
 854         case htons(ETH_P_MPLS_MC): {
 855                 struct mpls_label mpls_tmp, *mpls;
 856
 857                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 858                                           sizeof(*mpls), &mpls_tmp);
 859                 if (!mpls)
 860                         return 0;
 861
 862                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 863                         >> MPLS_LS_TC_SHIFT;
 864         }
 865         case htons(ETH_P_80221):
 866                 /* 802.21 is always network control traffic */
 867                 return 7;
 868         default:
 869                 return 0;
 870         }
 871
 872         if (qos_map) {
 873                 unsigned int i, tmp_dscp = dscp >> 2;
 874
 875                 for (i = 0; i < qos_map->num_des; i++) {
 876                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 877                                 return qos_map->dscp_exception[i].up;
 878                 }
 879
 880                 for (i = 0; i < 8; i++) {
 881                         if (tmp_dscp >= qos_map->up[i].low &&
 882                             tmp_dscp <= qos_map->up[i].high)
 883                                 return i;
 884                 }
 885         }
 886
 887         return dscp >> 5;
 888 }
 889 EXPORT_SYMBOL(cfg80211_classify8021d);
 890
 891 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 892 {
 893         const struct cfg80211_bss_ies *ies;
 894
 895         ies = rcu_dereference(bss->ies);
 896         if (!ies)
 897                 return NULL;
 898
 899         return cfg80211_find_ie(ie, ies->data, ies->len);
 900 }
 901 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 902
 903 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 904 {
 905         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 906         struct net_device *dev = wdev->netdev;
 907         int i;
 908
 909         if (!wdev->connect_keys)
 910                 return;
 911
 912         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 913                 if (!wdev->connect_keys->params[i].cipher)
 914                         continue;
 915                 if (rdev_add_key(rdev, dev, i, false, NULL,
 916                                  &wdev->connect_keys->params[i])) {
 917                         netdev_err(dev, "failed to set key %d\n", i);
 918                         continue;
 919                 }
 920                 if (wdev->connect_keys->def == i)
 921                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 922                                 netdev_err(dev, "failed to set defkey %d\n", i);
 923                                 continue;
 924                         }
 925         }
 926
 927         kzfree(wdev->connect_keys);
 928         wdev->connect_keys = NULL;
 929 }
 930
 931 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 932 {
 933         struct cfg80211_event *ev;
 934         unsigned long flags;
 935         const u8 *bssid = NULL;
 936
 937         spin_lock_irqsave(&wdev->event_lock, flags);
 938         while (!list_empty(&wdev->event_list)) {
 939                 ev = list_first_entry(&wdev->event_list,
 940                                       struct cfg80211_event, list);
 941                 list_del(&ev->list);
 942                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 943
 944                 wdev_lock(wdev);
 945                 switch (ev->type) {
 946                 case EVENT_CONNECT_RESULT:
 947                         if (!is_zero_ether_addr(ev->cr.bssid))
 948                                 bssid = ev->cr.bssid;
 949                         __cfg80211_connect_result(
 950                                 wdev->netdev, bssid,
 951                                 ev->cr.req_ie, ev->cr.req_ie_len,
 952                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 953                                 ev->cr.status,
 954                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 955                                 ev->cr.bss);
 956                         break;
 957                 case EVENT_ROAMED:
 958                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 959                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 960                                           ev->rm.resp_ie_len);
 961                         break;
 962                 case EVENT_DISCONNECTED:
 963                         __cfg80211_disconnected(wdev->netdev,
 964                                                 ev->dc.ie, ev->dc.ie_len,
 965                                                 ev->dc.reason,
 966                                                 !ev->dc.locally_generated);
 967                         break;
 968                 case EVENT_IBSS_JOINED:
 969                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 970                                                ev->ij.channel);
 971                         break;
 972                 case EVENT_STOPPED:
 973                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 974                         break;
 975                 }
 976                 wdev_unlock(wdev);
 977
 978                 kfree(ev);
 979
 980                 spin_lock_irqsave(&wdev->event_lock, flags);
 981         }
 982         spin_unlock_irqrestore(&wdev->event_lock, flags);
 983 }
 984
 985 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 986 {
 987         struct wireless_dev *wdev;
 988
 989         ASSERT_RTNL();
 990
 991         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 992                 cfg80211_process_wdev_events(wdev);
 993 }
 994
 995 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 996                           struct net_device *dev, enum nl80211_iftype ntype,
 997                           u32 *flags, struct vif_params *params)
 998 {
 999         int err;
1000         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1001
1002         ASSERT_RTNL();
1003
1004         /* don't support changing VLANs, you just re-create them */
1005         if (otype == NL80211_IFTYPE_AP_VLAN)
1006                 return -EOPNOTSUPP;
1007
1008         /* cannot change into P2P device or NAN */
1009         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1010             ntype == NL80211_IFTYPE_NAN)
1011                 return -EOPNOTSUPP;
1012
1013         if (!rdev->ops->change_virtual_intf ||
1014             !(rdev->wiphy.interface_modes & (1 << ntype)))
1015                 return -EOPNOTSUPP;
1016
1017         /* if it's part of a bridge, reject changing type to station/ibss */
1018         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1019             (ntype == NL80211_IFTYPE_ADHOC ||
1020              ntype == NL80211_IFTYPE_STATION ||
1021              ntype == NL80211_IFTYPE_P2P_CLIENT))
1022                 return -EBUSY;
1023
1024         if (ntype != otype) {
1025                 dev->ieee80211_ptr->use_4addr = false;
1026                 dev->ieee80211_ptr->mesh_id_up_len = 0;
1027                 wdev_lock(dev->ieee80211_ptr);
1028                 rdev_set_qos_map(rdev, dev, NULL);
1029                 wdev_unlock(dev->ieee80211_ptr);
1030
1031                 switch (otype) {
1032                 case NL80211_IFTYPE_AP:
1033                         cfg80211_stop_ap(rdev, dev, true);
1034                         break;
1035                 case NL80211_IFTYPE_ADHOC:
1036                         cfg80211_leave_ibss(rdev, dev, false);
1037                         break;
1038                 case NL80211_IFTYPE_STATION:
1039                 case NL80211_IFTYPE_P2P_CLIENT:
1040                         wdev_lock(dev->ieee80211_ptr);
1041                         cfg80211_disconnect(rdev, dev,
1042                                             WLAN_REASON_DEAUTH_LEAVING, true);
1043                         wdev_unlock(dev->ieee80211_ptr);
1044                         break;
1045                 case NL80211_IFTYPE_MESH_POINT:
1046                         /* mesh should be handled? */
1047                         break;
1048                 default:
1049                         break;
1050                 }
1051
1052                 cfg80211_process_rdev_events(rdev);
1053         }
1054
1055         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
1056
1057         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1058
1059         if (!err && params && params->use_4addr != -1)
1060                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1061
1062         if (!err) {
1063                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1064                 switch (ntype) {
1065                 case NL80211_IFTYPE_STATION:
1066                         if (dev->ieee80211_ptr->use_4addr)
1067                                 break;
1068                         /* fall through */
1069                 case NL80211_IFTYPE_OCB:
1070                 case NL80211_IFTYPE_P2P_CLIENT:
1071                 case NL80211_IFTYPE_ADHOC:
1072                         dev->priv_flags |= IFF_DONT_BRIDGE;
1073                         break;
1074                 case NL80211_IFTYPE_P2P_GO:
1075                 case NL80211_IFTYPE_AP:
1076                 case NL80211_IFTYPE_AP_VLAN:
1077                 case NL80211_IFTYPE_WDS:
1078                 case NL80211_IFTYPE_MESH_POINT:
1079                         /* bridging OK */
1080                         break;
1081                 case NL80211_IFTYPE_MONITOR:
1082                         /* monitor can't bridge anyway */
1083                         break;
1084                 case NL80211_IFTYPE_UNSPECIFIED:
1085                 case NUM_NL80211_IFTYPES:
1086                         /* not happening */
1087                         break;
1088                 case NL80211_IFTYPE_P2P_DEVICE:
1089                 case NL80211_IFTYPE_NAN:
1090                         WARN_ON(1);
1091                         break;
1092                 }
1093         }
1094
1095         if (!err && ntype != otype && netif_running(dev)) {
1096                 cfg80211_update_iface_num(rdev, ntype, 1);
1097                 cfg80211_update_iface_num(rdev, otype, -1);
1098         }
1099
1100         return err;
1101 }
1102
1103 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1104 {
1105         static const u32 __mcs2bitrate[] = {
1106                 /* control PHY */
1107                 [0] =   275,
1108                 /* SC PHY */
1109                 [1] =  3850,
1110                 [2] =  7700,
1111                 [3] =  9625,
1112                 [4] = 11550,
1113                 [5] = 12512, /* 1251.25 mbps */
1114                 [6] = 15400,
1115                 [7] = 19250,
1116                 [8] = 23100,
1117                 [9] = 25025,
1118                 [10] = 30800,
1119                 [11] = 38500,
1120                 [12] = 46200,
1121                 /* OFDM PHY */
1122                 [13] =  6930,
1123                 [14] =  8662, /* 866.25 mbps */
1124                 [15] = 13860,
1125                 [16] = 17325,
1126                 [17] = 20790,
1127                 [18] = 27720,
1128                 [19] = 34650,
1129                 [20] = 41580,
1130                 [21] = 45045,
1131                 [22] = 51975,
1132                 [23] = 62370,
1133                 [24] = 67568, /* 6756.75 mbps */
1134                 /* LP-SC PHY */
1135                 [25] =  6260,
1136                 [26] =  8340,
1137                 [27] = 11120,
1138                 [28] = 12510,
1139                 [29] = 16680,
1140                 [30] = 22240,
1141                 [31] = 25030,
1142         };
1143
1144         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1145                 return 0;
1146
1147         return __mcs2bitrate[rate->mcs];
1148 }
1149
1150 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1151 {
1152         static const u32 base[4][10] = {
1153                 {   6500000,
1154                    13000000,
1155                    19500000,
1156                    26000000,
1157                    39000000,
1158                    52000000,
1159                    58500000,
1160                    65000000,
1161                    78000000,
1162                 /* not in the spec, but some devices use this: */
1163                    86500000,
1164                 },
1165                 {  13500000,
1166                    27000000,
1167                    40500000,
1168                    54000000,
1169                    81000000,
1170                   108000000,
1171                   121500000,
1172                   135000000,
1173                   162000000,
1174                   180000000,
1175                 },
1176                 {  29300000,
1177                    58500000,
1178                    87800000,
1179                   117000000,
1180                   175500000,
1181                   234000000,
1182                   263300000,
1183                   292500000,
1184                   351000000,
1185                   390000000,
1186                 },
1187                 {  58500000,
1188                   117000000,
1189                   175500000,
1190                   234000000,
1191                   351000000,
1192                   468000000,
1193                   526500000,
1194                   585000000,
1195                   702000000,
1196                   780000000,
1197                 },
1198         };
1199         u32 bitrate;
1200         int idx;
1201
1202         if (WARN_ON_ONCE(rate->mcs > 9))
1203                 return 0;
1204
1205         switch (rate->bw) {
1206         case RATE_INFO_BW_160:
1207                 idx = 3;
1208                 break;
1209         case RATE_INFO_BW_80:
1210                 idx = 2;
1211                 break;
1212         case RATE_INFO_BW_40:
1213                 idx = 1;
1214                 break;
1215         case RATE_INFO_BW_5:
1216         case RATE_INFO_BW_10:
1217         default:
1218                 WARN_ON(1);
1219                 /* fall through */
1220         case RATE_INFO_BW_20:
1221                 idx = 0;
1222         }
1223
1224         bitrate = base[idx][rate->mcs];
1225         bitrate *= rate->nss;
1226
1227         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1228                 bitrate = (bitrate / 9) * 10;
1229
1230         /* do NOT round down here */
1231         return (bitrate + 50000) / 100000;
1232 }
1233
1234 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1235 {
1236         int modulation, streams, bitrate;
1237
1238         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1239             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1240                 return rate->legacy;
1241         if (rate->flags & RATE_INFO_FLAGS_60G)
1242                 return cfg80211_calculate_bitrate_60g(rate);
1243         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1244                 return cfg80211_calculate_bitrate_vht(rate);
1245
1246         /* the formula below does only work for MCS values smaller than 32 */
1247         if (WARN_ON_ONCE(rate->mcs >= 32))
1248                 return 0;
1249
1250         modulation = rate->mcs & 7;
1251         streams = (rate->mcs >> 3) + 1;
1252
1253         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1254
1255         if (modulation < 4)
1256                 bitrate *= (modulation + 1);
1257         else if (modulation == 4)
1258                 bitrate *= (modulation + 2);
1259         else
1260                 bitrate *= (modulation + 3);
1261
1262         bitrate *= streams;
1263
1264         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1265                 bitrate = (bitrate / 9) * 10;
1266
1267         /* do NOT round down here */
1268         return (bitrate + 50000) / 100000;
1269 }
1270 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1271
1272 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1273                           enum ieee80211_p2p_attr_id attr,
1274                           u8 *buf, unsigned int bufsize)
1275 {
1276         u8 *out = buf;
1277         u16 attr_remaining = 0;
1278         bool desired_attr = false;
1279         u16 desired_len = 0;
1280
1281         while (len > 0) {
1282                 unsigned int iedatalen;
1283                 unsigned int copy;
1284                 const u8 *iedata;
1285
1286                 if (len < 2)
1287                         return -EILSEQ;
1288                 iedatalen = ies[1];
1289                 if (iedatalen + 2 > len)
1290                         return -EILSEQ;
1291
1292                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1293                         goto cont;
1294
1295                 if (iedatalen < 4)
1296                         goto cont;
1297
1298                 iedata = ies + 2;
1299
1300                 /* check WFA OUI, P2P subtype */
1301                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1302                     iedata[2] != 0x9a || iedata[3] != 0x09)
1303                         goto cont;
1304
1305                 iedatalen -= 4;
1306                 iedata += 4;
1307
1308                 /* check attribute continuation into this IE */
1309                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1310                 if (copy && desired_attr) {
1311                         desired_len += copy;
1312                         if (out) {
1313                                 memcpy(out, iedata, min(bufsize, copy));
1314                                 out += min(bufsize, copy);
1315                                 bufsize -= min(bufsize, copy);
1316                         }
1317
1318
1319                         if (copy == attr_remaining)
1320                                 return desired_len;
1321                 }
1322
1323                 attr_remaining -= copy;
1324                 if (attr_remaining)
1325                         goto cont;
1326
1327                 iedatalen -= copy;
1328                 iedata += copy;
1329
1330                 while (iedatalen > 0) {
1331                         u16 attr_len;
1332
1333                         /* P2P attribute ID & size must fit */
1334                         if (iedatalen < 3)
1335                                 return -EILSEQ;
1336                         desired_attr = iedata[0] == attr;
1337                         attr_len = get_unaligned_le16(iedata + 1);
1338                         iedatalen -= 3;
1339                         iedata += 3;
1340
1341                         copy = min_t(unsigned int, attr_len, iedatalen);
1342
1343                         if (desired_attr) {
1344                                 desired_len += copy;
1345                                 if (out) {
1346                                         memcpy(out, iedata, min(bufsize, copy));
1347                                         out += min(bufsize, copy);
1348                                         bufsize -= min(bufsize, copy);
1349                                 }
1350
1351                                 if (copy == attr_len)
1352                                         return desired_len;
1353                         }
1354
1355                         iedata += copy;
1356                         iedatalen -= copy;
1357                         attr_remaining = attr_len - copy;
1358                 }
1359
1360  cont:
1361                 len -= ies[1] + 2;
1362                 ies += ies[1] + 2;
1363         }
1364
1365         if (attr_remaining && desired_attr)
1366                 return -EILSEQ;
1367
1368         return -ENOENT;
1369 }
1370 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1371
1372 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1373 {
1374         int i;
1375
1376         for (i = 0; i < n_ids; i++)
1377                 if (ids[i] == id)
1378                         return true;
1379         return false;
1380 }
1381
1382 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1383 {
1384         /* we assume a validly formed IEs buffer */
1385         u8 len = ies[pos + 1];
1386
1387         pos += 2 + len;
1388
1389         /* the IE itself must have 255 bytes for fragments to follow */
1390         if (len < 255)
1391                 return pos;
1392
1393         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1394                 len = ies[pos + 1];
1395                 pos += 2 + len;
1396         }
1397
1398         return pos;
1399 }
1400
1401 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1402                               const u8 *ids, int n_ids,
1403                               const u8 *after_ric, int n_after_ric,
1404                               size_t offset)
1405 {
1406         size_t pos = offset;
1407
1408         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1409                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1410                         pos = skip_ie(ies, ielen, pos);
1411
1412                         while (pos < ielen &&
1413                                !ieee80211_id_in_list(after_ric, n_after_ric,
1414                                                      ies[pos]))
1415                                 pos = skip_ie(ies, ielen, pos);
1416                 } else {
1417                         pos = skip_ie(ies, ielen, pos);
1418                 }
1419         }
1420
1421         return pos;
1422 }
1423 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1424
1425 bool ieee80211_operating_class_to_band(u8 operating_class,
1426                                        enum nl80211_band *band)
1427 {
1428         switch (operating_class) {
1429         case 112:
1430         case 115 ... 127:
1431         case 128 ... 130:
1432                 *band = NL80211_BAND_5GHZ;
1433                 return true;
1434         case 81:
1435         case 82:
1436         case 83:
1437         case 84:
1438                 *band = NL80211_BAND_2GHZ;
1439                 return true;
1440         case 180:
1441                 *band = NL80211_BAND_60GHZ;
1442                 return true;
1443         }
1444
1445         return false;
1446 }
1447 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1448
1449 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1450                                           u8 *op_class)
1451 {
1452         u8 vht_opclass;
1453         u16 freq = chandef->center_freq1;
1454
1455         if (freq >= 2412 && freq <= 2472) {
1456                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1457                         return false;
1458
1459                 /* 2.407 GHz, channels 1..13 */
1460                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1461                         if (freq > chandef->chan->center_freq)
1462                                 *op_class = 83; /* HT40+ */
1463                         else
1464                                 *op_class = 84; /* HT40- */
1465                 } else {
1466                         *op_class = 81;
1467                 }
1468
1469                 return true;
1470         }
1471
1472         if (freq == 2484) {
1473                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1474                         return false;
1475
1476                 *op_class = 82; /* channel 14 */
1477                 return true;
1478         }
1479
1480         switch (chandef->width) {
1481         case NL80211_CHAN_WIDTH_80:
1482                 vht_opclass = 128;
1483                 break;
1484         case NL80211_CHAN_WIDTH_160:
1485                 vht_opclass = 129;
1486                 break;
1487         case NL80211_CHAN_WIDTH_80P80:
1488                 vht_opclass = 130;
1489                 break;
1490         case NL80211_CHAN_WIDTH_10:
1491         case NL80211_CHAN_WIDTH_5:
1492                 return false; /* unsupported for now */
1493         default:
1494                 vht_opclass = 0;
1495                 break;
1496         }
1497
1498         /* 5 GHz, channels 36..48 */
1499         if (freq >= 5180 && freq <= 5240) {
1500                 if (vht_opclass) {
1501                         *op_class = vht_opclass;
1502                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1503                         if (freq > chandef->chan->center_freq)
1504                                 *op_class = 116;
1505                         else
1506                                 *op_class = 117;
1507                 } else {
1508                         *op_class = 115;
1509                 }
1510
1511                 return true;
1512         }
1513
1514         /* 5 GHz, channels 52..64 */
1515         if (freq >= 5260 && freq <= 5320) {
1516                 if (vht_opclass) {
1517                         *op_class = vht_opclass;
1518                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1519                         if (freq > chandef->chan->center_freq)
1520                                 *op_class = 119;
1521                         else
1522                                 *op_class = 120;
1523                 } else {
1524                         *op_class = 118;
1525                 }
1526
1527                 return true;
1528         }
1529
1530         /* 5 GHz, channels 100..144 */
1531         if (freq >= 5500 && freq <= 5720) {
1532                 if (vht_opclass) {
1533                         *op_class = vht_opclass;
1534                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1535                         if (freq > chandef->chan->center_freq)
1536                                 *op_class = 122;
1537                         else
1538                                 *op_class = 123;
1539                 } else {
1540                         *op_class = 121;
1541                 }
1542
1543                 return true;
1544         }
1545
1546         /* 5 GHz, channels 149..169 */
1547         if (freq >= 5745 && freq <= 5845) {
1548                 if (vht_opclass) {
1549                         *op_class = vht_opclass;
1550                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1551                         if (freq > chandef->chan->center_freq)
1552                                 *op_class = 126;
1553                         else
1554                                 *op_class = 127;
1555                 } else if (freq <= 5805) {
1556                         *op_class = 124;
1557                 } else {
1558                         *op_class = 125;
1559                 }
1560
1561                 return true;
1562         }
1563
1564         /* 56.16 GHz, channel 1..4 */
1565         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1566                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1567                         return false;
1568
1569                 *op_class = 180;
1570                 return true;
1571         }
1572
1573         /* not supported yet */
1574         return false;
1575 }
1576 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1577
1578 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1579                                        u32 *beacon_int_gcd,
1580                                        bool *beacon_int_different)
1581 {
1582         struct wireless_dev *wdev;
1583
1584         *beacon_int_gcd = 0;
1585         *beacon_int_different = false;
1586
1587         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1588                 if (!wdev->beacon_interval)
1589                         continue;
1590
1591                 if (!*beacon_int_gcd) {
1592                         *beacon_int_gcd = wdev->beacon_interval;
1593                         continue;
1594                 }
1595
1596                 if (wdev->beacon_interval == *beacon_int_gcd)
1597                         continue;
1598
1599                 *beacon_int_different = true;
1600                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1601         }
1602
1603         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1604                 if (*beacon_int_gcd)
1605                         *beacon_int_different = true;
1606                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1607         }
1608 }
1609
1610 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1611                                  enum nl80211_iftype iftype, u32 beacon_int)
1612 {
1613         /*
1614          * This is just a basic pre-condition check; if interface combinations
1615          * are possible the driver must already be checking those with a call
1616          * to cfg80211_check_combinations(), in which case we'll validate more
1617          * through the cfg80211_calculate_bi_data() call and code in
1618          * cfg80211_iter_combinations().
1619          */
1620
1621         if (beacon_int < 10 || beacon_int > 10000)
1622                 return -EINVAL;
1623
1624         return 0;
1625 }
1626
1627 int cfg80211_iter_combinations(struct wiphy *wiphy,
1628                                struct iface_combination_params *params,
1629                                void (*iter)(const struct ieee80211_iface_combination *c,
1630                                             void *data),
1631                                void *data)
1632 {
1633         const struct ieee80211_regdomain *regdom;
1634         enum nl80211_dfs_regions region = 0;
1635         int i, j, iftype;
1636         int num_interfaces = 0;
1637         u32 used_iftypes = 0;
1638         u32 beacon_int_gcd;
1639         bool beacon_int_different;
1640
1641         /*
1642          * This is a bit strange, since the iteration used to rely only on
1643          * the data given by the driver, but here it now relies on context,
1644          * in form of the currently operating interfaces.
1645          * This is OK for all current users, and saves us from having to
1646          * push the GCD calculations into all the drivers.
1647          * In the future, this should probably rely more on data that's in
1648          * cfg80211 already - the only thing not would appear to be any new
1649          * interfaces (while being brought up) and channel/radar data.
1650          */
1651         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1652                                    &beacon_int_gcd, &beacon_int_different);
1653
1654         if (params->radar_detect) {
1655                 rcu_read_lock();
1656                 regdom = rcu_dereference(cfg80211_regdomain);
1657                 if (regdom)
1658                         region = regdom->dfs_region;
1659                 rcu_read_unlock();
1660         }
1661
1662         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1663                 num_interfaces += params->iftype_num[iftype];
1664                 if (params->iftype_num[iftype] > 0 &&
1665                     !(wiphy->software_iftypes & BIT(iftype)))
1666                         used_iftypes |= BIT(iftype);
1667         }
1668
1669         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1670                 const struct ieee80211_iface_combination *c;
1671                 struct ieee80211_iface_limit *limits;
1672                 u32 all_iftypes = 0;
1673
1674                 c = &wiphy->iface_combinations[i];
1675
1676                 if (num_interfaces > c->max_interfaces)
1677                         continue;
1678                 if (params->num_different_channels > c->num_different_channels)
1679                         continue;
1680
1681                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1682                                  GFP_KERNEL);
1683                 if (!limits)
1684                         return -ENOMEM;
1685
1686                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1687                         if (wiphy->software_iftypes & BIT(iftype))
1688                                 continue;
1689                         for (j = 0; j < c->n_limits; j++) {
1690                                 all_iftypes |= limits[j].types;
1691                                 if (!(limits[j].types & BIT(iftype)))
1692                                         continue;
1693                                 if (limits[j].max < params->iftype_num[iftype])
1694                                         goto cont;
1695                                 limits[j].max -= params->iftype_num[iftype];
1696                         }
1697                 }
1698
1699                 if (params->radar_detect !=
1700                         (c->radar_detect_widths & params->radar_detect))
1701                         goto cont;
1702
1703                 if (params->radar_detect && c->radar_detect_regions &&
1704                     !(c->radar_detect_regions & BIT(region)))
1705                         goto cont;
1706
1707                 /* Finally check that all iftypes that we're currently
1708                  * using are actually part of this combination. If they
1709                  * aren't then we can't use this combination and have
1710                  * to continue to the next.
1711                  */
1712                 if ((all_iftypes & used_iftypes) != used_iftypes)
1713                         goto cont;
1714
1715                 if (beacon_int_gcd) {
1716                         if (c->beacon_int_min_gcd &&
1717                             beacon_int_gcd < c->beacon_int_min_gcd)
1718                                 goto cont;
1719                         if (!c->beacon_int_min_gcd && beacon_int_different)
1720                                 goto cont;
1721                 }
1722
1723                 /* This combination covered all interface types and
1724                  * supported the requested numbers, so we're good.
1725                  */
1726
1727                 (*iter)(c, data);
1728  cont:
1729                 kfree(limits);
1730         }
1731
1732         return 0;
1733 }
1734 EXPORT_SYMBOL(cfg80211_iter_combinations);
1735
1736 static void
1737 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1738                           void *data)
1739 {
1740         int *num = data;
1741         (*num)++;
1742 }
1743
1744 int cfg80211_check_combinations(struct wiphy *wiphy,
1745                                 struct iface_combination_params *params)
1746 {
1747         int err, num = 0;
1748
1749         err = cfg80211_iter_combinations(wiphy, params,
1750                                          cfg80211_iter_sum_ifcombs, &num);
1751         if (err)
1752                 return err;
1753         if (num == 0)
1754                 return -EBUSY;
1755
1756         return 0;
1757 }
1758 EXPORT_SYMBOL(cfg80211_check_combinations);
1759
1760 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1761                            const u8 *rates, unsigned int n_rates,
1762                            u32 *mask)
1763 {
1764         int i, j;
1765
1766         if (!sband)
1767                 return -EINVAL;
1768
1769         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1770                 return -EINVAL;
1771
1772         *mask = 0;
1773
1774         for (i = 0; i < n_rates; i++) {
1775                 int rate = (rates[i] & 0x7f) * 5;
1776                 bool found = false;
1777
1778                 for (j = 0; j < sband->n_bitrates; j++) {
1779                         if (sband->bitrates[j].bitrate == rate) {
1780                                 found = true;
1781                                 *mask |= BIT(j);
1782                                 break;
1783                         }
1784                 }
1785                 if (!found)
1786                         return -EINVAL;
1787         }
1788
1789         /*
1790          * mask must have at least one bit set here since we
1791          * didn't accept a 0-length rates array nor allowed
1792          * entries in the array that didn't exist
1793          */
1794
1795         return 0;
1796 }
1797
1798 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1799 {
1800         enum nl80211_band band;
1801         unsigned int n_channels = 0;
1802
1803         for (band = 0; band < NUM_NL80211_BANDS; band++)
1804                 if (wiphy->bands[band])
1805                         n_channels += wiphy->bands[band]->n_channels;
1806
1807         return n_channels;
1808 }
1809 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1810
1811 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1812                          struct station_info *sinfo)
1813 {
1814         struct cfg80211_registered_device *rdev;
1815         struct wireless_dev *wdev;
1816
1817         wdev = dev->ieee80211_ptr;
1818         if (!wdev)
1819                 return -EOPNOTSUPP;
1820
1821         rdev = wiphy_to_rdev(wdev->wiphy);
1822         if (!rdev->ops->get_station)
1823                 return -EOPNOTSUPP;
1824
1825         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1826 }
1827 EXPORT_SYMBOL(cfg80211_get_station);
1828
1829 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1830 {
1831         int i;
1832
1833         if (!f)
1834                 return;
1835
1836         kfree(f->serv_spec_info);
1837         kfree(f->srf_bf);
1838         kfree(f->srf_macs);
1839         for (i = 0; i < f->num_rx_filters; i++)
1840                 kfree(f->rx_filters[i].filter);
1841
1842         for (i = 0; i < f->num_tx_filters; i++)
1843                 kfree(f->tx_filters[i].filter);
1844
1845         kfree(f->rx_filters);
1846         kfree(f->tx_filters);
1847         kfree(f);
1848 }
1849 EXPORT_SYMBOL(cfg80211_free_nan_func);
1850
1851 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1852 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1853 const unsigned char rfc1042_header[] __aligned(2) =
1854         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1855 EXPORT_SYMBOL(rfc1042_header);
1856
1857 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1858 const unsigned char bridge_tunnel_header[] __aligned(2) =
1859         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1860 EXPORT_SYMBOL(bridge_tunnel_header);