net/wireless/util.c

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