net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <[email protected]>
   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, 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 {
 141         int i, want;
 142
 143         switch (sband->band) {
 144         case NL80211_BAND_5GHZ:
 145                 want = 3;
 146                 for (i = 0; i < sband->n_bitrates; i++) {
 147                         if (sband->bitrates[i].bitrate == 60 ||
 148                             sband->bitrates[i].bitrate == 120 ||
 149                             sband->bitrates[i].bitrate == 240) {
 150                                 sband->bitrates[i].flags |=
 151                                         IEEE80211_RATE_MANDATORY_A;
 152                                 want--;
 153                         }
 154                 }
 155                 WARN_ON(want);
 156                 break;
 157         case NL80211_BAND_2GHZ:
 158                 want = 7;
 159                 for (i = 0; i < sband->n_bitrates; i++) {
 160                         if (sband->bitrates[i].bitrate == 10) {
 161                                 sband->bitrates[i].flags |=
 162                                         IEEE80211_RATE_MANDATORY_B |
 163                                         IEEE80211_RATE_MANDATORY_G;
 164                                 want--;
 165                         }
 166
 167                         if (sband->bitrates[i].bitrate == 20 ||
 168                             sband->bitrates[i].bitrate == 55 ||
 169                             sband->bitrates[i].bitrate == 110 ||
 170                             sband->bitrates[i].bitrate == 60 ||
 171                             sband->bitrates[i].bitrate == 120 ||
 172                             sband->bitrates[i].bitrate == 240) {
 173                                 sband->bitrates[i].flags |=
 174                                         IEEE80211_RATE_MANDATORY_G;
 175                                 want--;
 176                         }
 177
 178                         if (sband->bitrates[i].bitrate != 10 &&
 179                             sband->bitrates[i].bitrate != 20 &&
 180                             sband->bitrates[i].bitrate != 55 &&
 181                             sband->bitrates[i].bitrate != 110)
 182                                 sband->bitrates[i].flags |=
 183                                         IEEE80211_RATE_ERP_G;
 184                 }
 185                 WARN_ON(want != 0 && want != 3 && want != 6);
 186                 break;
 187         case NL80211_BAND_60GHZ:
 188                 /* check for mandatory HT MCS 1..4 */
 189                 WARN_ON(!sband->ht_cap.ht_supported);
 190                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 191                 break;
 192         case NUM_NL80211_BANDS:
 193         default:
 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]);
 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 = 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
 625         if (encaps_data) {
 626                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 627                 nh_pos += encaps_len;
 628                 h_pos += encaps_len;
 629         }
 630
 631         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 632
 633         nh_pos += hdrlen;
 634         h_pos += hdrlen;
 635
 636         /* Update skb pointers to various headers since this modified frame
 637          * is going to go through Linux networking code that may potentially
 638          * need things like pointer to IP header. */
 639         skb_reset_mac_header(skb);
 640         skb_set_network_header(skb, nh_pos);
 641         skb_set_transport_header(skb, h_pos);
 642
 643         return 0;
 644 }
 645 EXPORT_SYMBOL(ieee80211_data_from_8023);
 646
 647 static void
 648 __frame_add_frag(struct sk_buff *skb, struct page *page,
 649                  void *ptr, int len, int size)
 650 {
 651         struct skb_shared_info *sh = skb_shinfo(skb);
 652         int page_offset;
 653
 654         page_ref_inc(page);
 655         page_offset = ptr - page_address(page);
 656         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 657 }
 658
 659 static void
 660 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 661                             int offset, int len)
 662 {
 663         struct skb_shared_info *sh = skb_shinfo(skb);
 664         const skb_frag_t *frag = &sh->frags[0];
 665         struct page *frag_page;
 666         void *frag_ptr;
 667         int frag_len, frag_size;
 668         int head_size = skb->len - skb->data_len;
 669         int cur_len;
 670
 671         frag_page = virt_to_head_page(skb->head);
 672         frag_ptr = skb->data;
 673         frag_size = head_size;
 674
 675         while (offset >= frag_size) {
 676                 offset -= frag_size;
 677                 frag_page = skb_frag_page(frag);
 678                 frag_ptr = skb_frag_address(frag);
 679                 frag_size = skb_frag_size(frag);
 680                 frag++;
 681         }
 682
 683         frag_ptr += offset;
 684         frag_len = frag_size - offset;
 685
 686         cur_len = min(len, frag_len);
 687
 688         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 689         len -= cur_len;
 690
 691         while (len > 0) {
 692                 frag_len = skb_frag_size(frag);
 693                 cur_len = min(len, frag_len);
 694                 __frame_add_frag(frame, skb_frag_page(frag),
 695                                  skb_frag_address(frag), cur_len, frag_len);
 696                 len -= cur_len;
 697                 frag++;
 698         }
 699 }
 700
 701 static struct sk_buff *
 702 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 703                        int offset, int len, bool reuse_frag)
 704 {
 705         struct sk_buff *frame;
 706         int cur_len = len;
 707
 708         if (skb->len - offset < len)
 709                 return NULL;
 710
 711         /*
 712          * When reusing framents, copy some data to the head to simplify
 713          * ethernet header handling and speed up protocol header processing
 714          * in the stack later.
 715          */
 716         if (reuse_frag)
 717                 cur_len = min_t(int, len, 32);
 718
 719         /*
 720          * Allocate and reserve two bytes more for payload
 721          * alignment since sizeof(struct ethhdr) is 14.
 722          */
 723         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 724         if (!frame)
 725                 return NULL;
 726
 727         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 728         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 729
 730         len -= cur_len;
 731         if (!len)
 732                 return frame;
 733
 734         offset += cur_len;
 735         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 736
 737         return frame;
 738 }
 739
 740 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 741                               const u8 *addr, enum nl80211_iftype iftype,
 742                               const unsigned int extra_headroom,
 743                               const u8 *check_da, const u8 *check_sa)
 744 {
 745         unsigned int hlen = ALIGN(extra_headroom, 4);
 746         struct sk_buff *frame = NULL;
 747         u16 ethertype;
 748         u8 *payload;
 749         int offset = 0, remaining;
 750         struct ethhdr eth;
 751         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 752         bool reuse_skb = false;
 753         bool last = false;
 754
 755         while (!last) {
 756                 unsigned int subframe_len;
 757                 int len;
 758                 u8 padding;
 759
 760                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 761                 len = ntohs(eth.h_proto);
 762                 subframe_len = sizeof(struct ethhdr) + len;
 763                 padding = (4 - subframe_len) & 0x3;
 764
 765                 /* the last MSDU has no padding */
 766                 remaining = skb->len - offset;
 767                 if (subframe_len > remaining)
 768                         goto purge;
 769
 770                 offset += sizeof(struct ethhdr);
 771                 last = remaining <= subframe_len + padding;
 772
 773                 /* FIXME: should we really accept multicast DA? */
 774                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 775                      !ether_addr_equal(check_da, eth.h_dest)) ||
 776                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 777                         offset += len + padding;
 778                         continue;
 779                 }
 780
 781                 /* reuse skb for the last subframe */
 782                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 783                         skb_pull(skb, offset);
 784                         frame = skb;
 785                         reuse_skb = true;
 786                 } else {
 787                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 788                                                        reuse_frag);
 789                         if (!frame)
 790                                 goto purge;
 791
 792                         offset += len + padding;
 793                 }
 794
 795                 skb_reset_network_header(frame);
 796                 frame->dev = skb->dev;
 797                 frame->priority = skb->priority;
 798
 799                 payload = frame->data;
 800                 ethertype = (payload[6] << 8) | payload[7];
 801                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 802                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 803                            ether_addr_equal(payload, bridge_tunnel_header))) {
 804                         eth.h_proto = htons(ethertype);
 805                         skb_pull(frame, ETH_ALEN + 2);
 806                 }
 807
 808                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 809                 __skb_queue_tail(list, frame);
 810         }
 811
 812         if (!reuse_skb)
 813                 dev_kfree_skb(skb);
 814
 815         return;
 816
 817  purge:
 818         __skb_queue_purge(list);
 819         dev_kfree_skb(skb);
 820 }
 821 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 822
 823 /* Given a data frame determine the 802.1p/1d tag to use. */
 824 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 825                                     struct cfg80211_qos_map *qos_map)
 826 {
 827         unsigned int dscp;
 828         unsigned char vlan_priority;
 829
 830         /* skb->priority values from 256->263 are magic values to
 831          * directly indicate a specific 802.1d priority.  This is used
 832          * to allow 802.1d priority to be passed directly in from VLAN
 833          * tags, etc.
 834          */
 835         if (skb->priority >= 256 && skb->priority <= 263)
 836                 return skb->priority - 256;
 837
 838         if (skb_vlan_tag_present(skb)) {
 839                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 840                         >> VLAN_PRIO_SHIFT;
 841                 if (vlan_priority > 0)
 842                         return vlan_priority;
 843         }
 844
 845         switch (skb->protocol) {
 846         case htons(ETH_P_IP):
 847                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 848                 break;
 849         case htons(ETH_P_IPV6):
 850                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 851                 break;
 852         case htons(ETH_P_MPLS_UC):
 853         case htons(ETH_P_MPLS_MC): {
 854                 struct mpls_label mpls_tmp, *mpls;
 855
 856                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 857                                           sizeof(*mpls), &mpls_tmp);
 858                 if (!mpls)
 859                         return 0;
 860
 861                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 862                         >> MPLS_LS_TC_SHIFT;
 863         }
 864         case htons(ETH_P_80221):
 865                 /* 802.21 is always network control traffic */
 866                 return 7;
 867         default:
 868                 return 0;
 869         }
 870
 871         if (qos_map) {
 872                 unsigned int i, tmp_dscp = dscp >> 2;
 873
 874                 for (i = 0; i < qos_map->num_des; i++) {
 875                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 876                                 return qos_map->dscp_exception[i].up;
 877                 }
 878
 879                 for (i = 0; i < 8; i++) {
 880                         if (tmp_dscp >= qos_map->up[i].low &&
 881                             tmp_dscp <= qos_map->up[i].high)
 882                                 return i;
 883                 }
 884         }
 885
 886         return dscp >> 5;
 887 }
 888 EXPORT_SYMBOL(cfg80211_classify8021d);
 889
 890 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 891 {
 892         const struct cfg80211_bss_ies *ies;
 893
 894         ies = rcu_dereference(bss->ies);
 895         if (!ies)
 896                 return NULL;
 897
 898         return cfg80211_find_ie(ie, ies->data, ies->len);
 899 }
 900 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 901
 902 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 903 {
 904         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 905         struct net_device *dev = wdev->netdev;
 906         int i;
 907
 908         if (!wdev->connect_keys)
 909                 return;
 910
 911         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 912                 if (!wdev->connect_keys->params[i].cipher)
 913                         continue;
 914                 if (rdev_add_key(rdev, dev, i, false, NULL,
 915                                  &wdev->connect_keys->params[i])) {
 916                         netdev_err(dev, "failed to set key %d\n", i);
 917                         continue;
 918                 }
 919                 if (wdev->connect_keys->def == i &&
 920                     rdev_set_default_key(rdev, dev, i, true, true)) {
 921                         netdev_err(dev, "failed to set defkey %d\n", i);
 922                         continue;
 923                 }
 924         }
 925
 926         kzfree(wdev->connect_keys);
 927         wdev->connect_keys = NULL;
 928 }
 929
 930 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 931 {
 932         struct cfg80211_event *ev;
 933         unsigned long flags;
 934
 935         spin_lock_irqsave(&wdev->event_lock, flags);
 936         while (!list_empty(&wdev->event_list)) {
 937                 ev = list_first_entry(&wdev->event_list,
 938                                       struct cfg80211_event, list);
 939                 list_del(&ev->list);
 940                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 941
 942                 wdev_lock(wdev);
 943                 switch (ev->type) {
 944                 case EVENT_CONNECT_RESULT:
 945                         __cfg80211_connect_result(
 946                                 wdev->netdev,
 947                                 &ev->cr,
 948                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 949                         break;
 950                 case EVENT_ROAMED:
 951                         __cfg80211_roamed(wdev, &ev->rm);
 952                         break;
 953                 case EVENT_DISCONNECTED:
 954                         __cfg80211_disconnected(wdev->netdev,
 955                                                 ev->dc.ie, ev->dc.ie_len,
 956                                                 ev->dc.reason,
 957                                                 !ev->dc.locally_generated);
 958                         break;
 959                 case EVENT_IBSS_JOINED:
 960                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 961                                                ev->ij.channel);
 962                         break;
 963                 case EVENT_STOPPED:
 964                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 965                         break;
 966                 }
 967                 wdev_unlock(wdev);
 968
 969                 kfree(ev);
 970
 971                 spin_lock_irqsave(&wdev->event_lock, flags);
 972         }
 973         spin_unlock_irqrestore(&wdev->event_lock, flags);
 974 }
 975
 976 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 977 {
 978         struct wireless_dev *wdev;
 979
 980         ASSERT_RTNL();
 981
 982         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 983                 cfg80211_process_wdev_events(wdev);
 984 }
 985
 986 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 987                           struct net_device *dev, enum nl80211_iftype ntype,
 988                           struct vif_params *params)
 989 {
 990         int err;
 991         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 992
 993         ASSERT_RTNL();
 994
 995         /* don't support changing VLANs, you just re-create them */
 996         if (otype == NL80211_IFTYPE_AP_VLAN)
 997                 return -EOPNOTSUPP;
 998
 999         /* cannot change into P2P device or NAN */
1000         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1001             ntype == NL80211_IFTYPE_NAN)
1002                 return -EOPNOTSUPP;
1003
1004         if (!rdev->ops->change_virtual_intf ||
1005             !(rdev->wiphy.interface_modes & (1 << ntype)))
1006                 return -EOPNOTSUPP;
1007
1008         /* if it's part of a bridge, reject changing type to station/ibss */
1009         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1010             (ntype == NL80211_IFTYPE_ADHOC ||
1011              ntype == NL80211_IFTYPE_STATION ||
1012              ntype == NL80211_IFTYPE_P2P_CLIENT))
1013                 return -EBUSY;
1014
1015         if (ntype != otype) {
1016                 dev->ieee80211_ptr->use_4addr = false;
1017                 dev->ieee80211_ptr->mesh_id_up_len = 0;
1018                 wdev_lock(dev->ieee80211_ptr);
1019                 rdev_set_qos_map(rdev, dev, NULL);
1020                 wdev_unlock(dev->ieee80211_ptr);
1021
1022                 switch (otype) {
1023                 case NL80211_IFTYPE_AP:
1024                         cfg80211_stop_ap(rdev, dev, true);
1025                         break;
1026                 case NL80211_IFTYPE_ADHOC:
1027                         cfg80211_leave_ibss(rdev, dev, false);
1028                         break;
1029                 case NL80211_IFTYPE_STATION:
1030                 case NL80211_IFTYPE_P2P_CLIENT:
1031                         wdev_lock(dev->ieee80211_ptr);
1032                         cfg80211_disconnect(rdev, dev,
1033                                             WLAN_REASON_DEAUTH_LEAVING, true);
1034                         wdev_unlock(dev->ieee80211_ptr);
1035                         break;
1036                 case NL80211_IFTYPE_MESH_POINT:
1037                         /* mesh should be handled? */
1038                         break;
1039                 default:
1040                         break;
1041                 }
1042
1043                 cfg80211_process_rdev_events(rdev);
1044         }
1045
1046         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1047
1048         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1049
1050         if (!err && params && params->use_4addr != -1)
1051                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1052
1053         if (!err) {
1054                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1055                 switch (ntype) {
1056                 case NL80211_IFTYPE_STATION:
1057                         if (dev->ieee80211_ptr->use_4addr)
1058                                 break;
1059                         /* fall through */
1060                 case NL80211_IFTYPE_OCB:
1061                 case NL80211_IFTYPE_P2P_CLIENT:
1062                 case NL80211_IFTYPE_ADHOC:
1063                         dev->priv_flags |= IFF_DONT_BRIDGE;
1064                         break;
1065                 case NL80211_IFTYPE_P2P_GO:
1066                 case NL80211_IFTYPE_AP:
1067                 case NL80211_IFTYPE_AP_VLAN:
1068                 case NL80211_IFTYPE_WDS:
1069                 case NL80211_IFTYPE_MESH_POINT:
1070                         /* bridging OK */
1071                         break;
1072                 case NL80211_IFTYPE_MONITOR:
1073                         /* monitor can't bridge anyway */
1074                         break;
1075                 case NL80211_IFTYPE_UNSPECIFIED:
1076                 case NUM_NL80211_IFTYPES:
1077                         /* not happening */
1078                         break;
1079                 case NL80211_IFTYPE_P2P_DEVICE:
1080                 case NL80211_IFTYPE_NAN:
1081                         WARN_ON(1);
1082                         break;
1083                 }
1084         }
1085
1086         if (!err && ntype != otype && netif_running(dev)) {
1087                 cfg80211_update_iface_num(rdev, ntype, 1);
1088                 cfg80211_update_iface_num(rdev, otype, -1);
1089         }
1090
1091         return err;
1092 }
1093
1094 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1095 {
1096         int modulation, streams, bitrate;
1097
1098         /* the formula below does only work for MCS values smaller than 32 */
1099         if (WARN_ON_ONCE(rate->mcs >= 32))
1100                 return 0;
1101
1102         modulation = rate->mcs & 7;
1103         streams = (rate->mcs >> 3) + 1;
1104
1105         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1106
1107         if (modulation < 4)
1108                 bitrate *= (modulation + 1);
1109         else if (modulation == 4)
1110                 bitrate *= (modulation + 2);
1111         else
1112                 bitrate *= (modulation + 3);
1113
1114         bitrate *= streams;
1115
1116         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1117                 bitrate = (bitrate / 9) * 10;
1118
1119         /* do NOT round down here */
1120         return (bitrate + 50000) / 100000;
1121 }
1122
1123 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1124 {
1125         static const u32 __mcs2bitrate[] = {
1126                 /* control PHY */
1127                 [0] =   275,
1128                 /* SC PHY */
1129                 [1] =  3850,
1130                 [2] =  7700,
1131                 [3] =  9625,
1132                 [4] = 11550,
1133                 [5] = 12512, /* 1251.25 mbps */
1134                 [6] = 15400,
1135                 [7] = 19250,
1136                 [8] = 23100,
1137                 [9] = 25025,
1138                 [10] = 30800,
1139                 [11] = 38500,
1140                 [12] = 46200,
1141                 /* OFDM PHY */
1142                 [13] =  6930,
1143                 [14] =  8662, /* 866.25 mbps */
1144                 [15] = 13860,
1145                 [16] = 17325,
1146                 [17] = 20790,
1147                 [18] = 27720,
1148                 [19] = 34650,
1149                 [20] = 41580,
1150                 [21] = 45045,
1151                 [22] = 51975,
1152                 [23] = 62370,
1153                 [24] = 67568, /* 6756.75 mbps */
1154                 /* LP-SC PHY */
1155                 [25] =  6260,
1156                 [26] =  8340,
1157                 [27] = 11120,
1158                 [28] = 12510,
1159                 [29] = 16680,
1160                 [30] = 22240,
1161                 [31] = 25030,
1162         };
1163
1164         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1165                 return 0;
1166
1167         return __mcs2bitrate[rate->mcs];
1168 }
1169
1170 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1171 {
1172         static const u32 base[4][10] = {
1173                 {   6500000,
1174                    13000000,
1175                    19500000,
1176                    26000000,
1177                    39000000,
1178                    52000000,
1179                    58500000,
1180                    65000000,
1181                    78000000,
1182                 /* not in the spec, but some devices use this: */
1183                    86500000,
1184                 },
1185                 {  13500000,
1186                    27000000,
1187                    40500000,
1188                    54000000,
1189                    81000000,
1190                   108000000,
1191                   121500000,
1192                   135000000,
1193                   162000000,
1194                   180000000,
1195                 },
1196                 {  29300000,
1197                    58500000,
1198                    87800000,
1199                   117000000,
1200                   175500000,
1201                   234000000,
1202                   263300000,
1203                   292500000,
1204                   351000000,
1205                   390000000,
1206                 },
1207                 {  58500000,
1208                   117000000,
1209                   175500000,
1210                   234000000,
1211                   351000000,
1212                   468000000,
1213                   526500000,
1214                   585000000,
1215                   702000000,
1216                   780000000,
1217                 },
1218         };
1219         u32 bitrate;
1220         int idx;
1221
1222         if (rate->mcs > 9)
1223                 goto warn;
1224
1225         switch (rate->bw) {
1226         case RATE_INFO_BW_160:
1227                 idx = 3;
1228                 break;
1229         case RATE_INFO_BW_80:
1230                 idx = 2;
1231                 break;
1232         case RATE_INFO_BW_40:
1233                 idx = 1;
1234                 break;
1235         case RATE_INFO_BW_5:
1236         case RATE_INFO_BW_10:
1237         default:
1238                 goto warn;
1239         case RATE_INFO_BW_20:
1240                 idx = 0;
1241         }
1242
1243         bitrate = base[idx][rate->mcs];
1244         bitrate *= rate->nss;
1245
1246         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1247                 bitrate = (bitrate / 9) * 10;
1248
1249         /* do NOT round down here */
1250         return (bitrate + 50000) / 100000;
1251  warn:
1252         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1253                   rate->bw, rate->mcs, rate->nss);
1254         return 0;
1255 }
1256
1257 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1258 {
1259         if (rate->flags & RATE_INFO_FLAGS_MCS)
1260                 return cfg80211_calculate_bitrate_ht(rate);
1261         if (rate->flags & RATE_INFO_FLAGS_60G)
1262                 return cfg80211_calculate_bitrate_60g(rate);
1263         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1264                 return cfg80211_calculate_bitrate_vht(rate);
1265
1266         return rate->legacy;
1267 }
1268 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1269
1270 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1271                           enum ieee80211_p2p_attr_id attr,
1272                           u8 *buf, unsigned int bufsize)
1273 {
1274         u8 *out = buf;
1275         u16 attr_remaining = 0;
1276         bool desired_attr = false;
1277         u16 desired_len = 0;
1278
1279         while (len > 0) {
1280                 unsigned int iedatalen;
1281                 unsigned int copy;
1282                 const u8 *iedata;
1283
1284                 if (len < 2)
1285                         return -EILSEQ;
1286                 iedatalen = ies[1];
1287                 if (iedatalen + 2 > len)
1288                         return -EILSEQ;
1289
1290                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1291                         goto cont;
1292
1293                 if (iedatalen < 4)
1294                         goto cont;
1295
1296                 iedata = ies + 2;
1297
1298                 /* check WFA OUI, P2P subtype */
1299                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1300                     iedata[2] != 0x9a || iedata[3] != 0x09)
1301                         goto cont;
1302
1303                 iedatalen -= 4;
1304                 iedata += 4;
1305
1306                 /* check attribute continuation into this IE */
1307                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1308                 if (copy && desired_attr) {
1309                         desired_len += copy;
1310                         if (out) {
1311                                 memcpy(out, iedata, min(bufsize, copy));
1312                                 out += min(bufsize, copy);
1313                                 bufsize -= min(bufsize, copy);
1314                         }
1315
1316
1317                         if (copy == attr_remaining)
1318                                 return desired_len;
1319                 }
1320
1321                 attr_remaining -= copy;
1322                 if (attr_remaining)
1323                         goto cont;
1324
1325                 iedatalen -= copy;
1326                 iedata += copy;
1327
1328                 while (iedatalen > 0) {
1329                         u16 attr_len;
1330
1331                         /* P2P attribute ID & size must fit */
1332                         if (iedatalen < 3)
1333                                 return -EILSEQ;
1334                         desired_attr = iedata[0] == attr;
1335                         attr_len = get_unaligned_le16(iedata + 1);
1336                         iedatalen -= 3;
1337                         iedata += 3;
1338
1339                         copy = min_t(unsigned int, attr_len, iedatalen);
1340
1341                         if (desired_attr) {
1342                                 desired_len += copy;
1343                                 if (out) {
1344                                         memcpy(out, iedata, min(bufsize, copy));
1345                                         out += min(bufsize, copy);
1346                                         bufsize -= min(bufsize, copy);
1347                                 }
1348
1349                                 if (copy == attr_len)
1350                                         return desired_len;
1351                         }
1352
1353                         iedata += copy;
1354                         iedatalen -= copy;
1355                         attr_remaining = attr_len - copy;
1356                 }
1357
1358  cont:
1359                 len -= ies[1] + 2;
1360                 ies += ies[1] + 2;
1361         }
1362
1363         if (attr_remaining && desired_attr)
1364                 return -EILSEQ;
1365
1366         return -ENOENT;
1367 }
1368 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1369
1370 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1371 {
1372         int i;
1373
1374         for (i = 0; i < n_ids; i++)
1375                 if (ids[i] == id)
1376                         return true;
1377         return false;
1378 }
1379
1380 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1381 {
1382         /* we assume a validly formed IEs buffer */
1383         u8 len = ies[pos + 1];
1384
1385         pos += 2 + len;
1386
1387         /* the IE itself must have 255 bytes for fragments to follow */
1388         if (len < 255)
1389                 return pos;
1390
1391         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1392                 len = ies[pos + 1];
1393                 pos += 2 + len;
1394         }
1395
1396         return pos;
1397 }
1398
1399 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1400                               const u8 *ids, int n_ids,
1401                               const u8 *after_ric, int n_after_ric,
1402                               size_t offset)
1403 {
1404         size_t pos = offset;
1405
1406         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1407                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1408                         pos = skip_ie(ies, ielen, pos);
1409
1410                         while (pos < ielen &&
1411                                !ieee80211_id_in_list(after_ric, n_after_ric,
1412                                                      ies[pos]))
1413                                 pos = skip_ie(ies, ielen, pos);
1414                 } else {
1415                         pos = skip_ie(ies, ielen, pos);
1416                 }
1417         }
1418
1419         return pos;
1420 }
1421 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1422
1423 bool ieee80211_operating_class_to_band(u8 operating_class,
1424                                        enum nl80211_band *band)
1425 {
1426         switch (operating_class) {
1427         case 112:
1428         case 115 ... 127:
1429         case 128 ... 130:
1430                 *band = NL80211_BAND_5GHZ;
1431                 return true;
1432         case 81:
1433         case 82:
1434         case 83:
1435         case 84:
1436                 *band = NL80211_BAND_2GHZ;
1437                 return true;
1438         case 180:
1439                 *band = NL80211_BAND_60GHZ;
1440                 return true;
1441         }
1442
1443         return false;
1444 }
1445 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1446
1447 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1448                                           u8 *op_class)
1449 {
1450         u8 vht_opclass;
1451         u16 freq = chandef->center_freq1;
1452
1453         if (freq >= 2412 && freq <= 2472) {
1454                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1455                         return false;
1456
1457                 /* 2.407 GHz, channels 1..13 */
1458                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1459                         if (freq > chandef->chan->center_freq)
1460                                 *op_class = 83; /* HT40+ */
1461                         else
1462                                 *op_class = 84; /* HT40- */
1463                 } else {
1464                         *op_class = 81;
1465                 }
1466
1467                 return true;
1468         }
1469
1470         if (freq == 2484) {
1471                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1472                         return false;
1473
1474                 *op_class = 82; /* channel 14 */
1475                 return true;
1476         }
1477
1478         switch (chandef->width) {
1479         case NL80211_CHAN_WIDTH_80:
1480                 vht_opclass = 128;
1481                 break;
1482         case NL80211_CHAN_WIDTH_160:
1483                 vht_opclass = 129;
1484                 break;
1485         case NL80211_CHAN_WIDTH_80P80:
1486                 vht_opclass = 130;
1487                 break;
1488         case NL80211_CHAN_WIDTH_10:
1489         case NL80211_CHAN_WIDTH_5:
1490                 return false; /* unsupported for now */
1491         default:
1492                 vht_opclass = 0;
1493                 break;
1494         }
1495
1496         /* 5 GHz, channels 36..48 */
1497         if (freq >= 5180 && freq <= 5240) {
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 = 116;
1503                         else
1504                                 *op_class = 117;
1505                 } else {
1506                         *op_class = 115;
1507                 }
1508
1509                 return true;
1510         }
1511
1512         /* 5 GHz, channels 52..64 */
1513         if (freq >= 5260 && freq <= 5320) {
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 = 119;
1519                         else
1520                                 *op_class = 120;
1521                 } else {
1522                         *op_class = 118;
1523                 }
1524
1525                 return true;
1526         }
1527
1528         /* 5 GHz, channels 100..144 */
1529         if (freq >= 5500 && freq <= 5720) {
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 = 122;
1535                         else
1536                                 *op_class = 123;
1537                 } else {
1538                         *op_class = 121;
1539                 }
1540
1541                 return true;
1542         }
1543
1544         /* 5 GHz, channels 149..169 */
1545         if (freq >= 5745 && freq <= 5845) {
1546                 if (vht_opclass) {
1547                         *op_class = vht_opclass;
1548                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1549                         if (freq > chandef->chan->center_freq)
1550                                 *op_class = 126;
1551                         else
1552                                 *op_class = 127;
1553                 } else if (freq <= 5805) {
1554                         *op_class = 124;
1555                 } else {
1556                         *op_class = 125;
1557                 }
1558
1559                 return true;
1560         }
1561
1562         /* 56.16 GHz, channel 1..4 */
1563         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1564                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1565                         return false;
1566
1567                 *op_class = 180;
1568                 return true;
1569         }
1570
1571         /* not supported yet */
1572         return false;
1573 }
1574 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1575
1576 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1577                                        u32 *beacon_int_gcd,
1578                                        bool *beacon_int_different)
1579 {
1580         struct wireless_dev *wdev;
1581
1582         *beacon_int_gcd = 0;
1583         *beacon_int_different = false;
1584
1585         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1586                 if (!wdev->beacon_interval)
1587                         continue;
1588
1589                 if (!*beacon_int_gcd) {
1590                         *beacon_int_gcd = wdev->beacon_interval;
1591                         continue;
1592                 }
1593
1594                 if (wdev->beacon_interval == *beacon_int_gcd)
1595                         continue;
1596
1597                 *beacon_int_different = true;
1598                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1599         }
1600
1601         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1602                 if (*beacon_int_gcd)
1603                         *beacon_int_different = true;
1604                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1605         }
1606 }
1607
1608 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1609                                  enum nl80211_iftype iftype, u32 beacon_int)
1610 {
1611         /*
1612          * This is just a basic pre-condition check; if interface combinations
1613          * are possible the driver must already be checking those with a call
1614          * to cfg80211_check_combinations(), in which case we'll validate more
1615          * through the cfg80211_calculate_bi_data() call and code in
1616          * cfg80211_iter_combinations().
1617          */
1618
1619         if (beacon_int < 10 || beacon_int > 10000)
1620                 return -EINVAL;
1621
1622         return 0;
1623 }
1624
1625 int cfg80211_iter_combinations(struct wiphy *wiphy,
1626                                struct iface_combination_params *params,
1627                                void (*iter)(const struct ieee80211_iface_combination *c,
1628                                             void *data),
1629                                void *data)
1630 {
1631         const struct ieee80211_regdomain *regdom;
1632         enum nl80211_dfs_regions region = 0;
1633         int i, j, iftype;
1634         int num_interfaces = 0;
1635         u32 used_iftypes = 0;
1636         u32 beacon_int_gcd;
1637         bool beacon_int_different;
1638
1639         /*
1640          * This is a bit strange, since the iteration used to rely only on
1641          * the data given by the driver, but here it now relies on context,
1642          * in form of the currently operating interfaces.
1643          * This is OK for all current users, and saves us from having to
1644          * push the GCD calculations into all the drivers.
1645          * In the future, this should probably rely more on data that's in
1646          * cfg80211 already - the only thing not would appear to be any new
1647          * interfaces (while being brought up) and channel/radar data.
1648          */
1649         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1650                                    &beacon_int_gcd, &beacon_int_different);
1651
1652         if (params->radar_detect) {
1653                 rcu_read_lock();
1654                 regdom = rcu_dereference(cfg80211_regdomain);
1655                 if (regdom)
1656                         region = regdom->dfs_region;
1657                 rcu_read_unlock();
1658         }
1659
1660         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1661                 num_interfaces += params->iftype_num[iftype];
1662                 if (params->iftype_num[iftype] > 0 &&
1663                     !(wiphy->software_iftypes & BIT(iftype)))
1664                         used_iftypes |= BIT(iftype);
1665         }
1666
1667         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1668                 const struct ieee80211_iface_combination *c;
1669                 struct ieee80211_iface_limit *limits;
1670                 u32 all_iftypes = 0;
1671
1672                 c = &wiphy->iface_combinations[i];
1673
1674                 if (num_interfaces > c->max_interfaces)
1675                         continue;
1676                 if (params->num_different_channels > c->num_different_channels)
1677                         continue;
1678
1679                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1680                                  GFP_KERNEL);
1681                 if (!limits)
1682                         return -ENOMEM;
1683
1684                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1685                         if (wiphy->software_iftypes & BIT(iftype))
1686                                 continue;
1687                         for (j = 0; j < c->n_limits; j++) {
1688                                 all_iftypes |= limits[j].types;
1689                                 if (!(limits[j].types & BIT(iftype)))
1690                                         continue;
1691                                 if (limits[j].max < params->iftype_num[iftype])
1692                                         goto cont;
1693                                 limits[j].max -= params->iftype_num[iftype];
1694                         }
1695                 }
1696
1697                 if (params->radar_detect !=
1698                         (c->radar_detect_widths & params->radar_detect))
1699                         goto cont;
1700
1701                 if (params->radar_detect && c->radar_detect_regions &&
1702                     !(c->radar_detect_regions & BIT(region)))
1703                         goto cont;
1704
1705                 /* Finally check that all iftypes that we're currently
1706                  * using are actually part of this combination. If they
1707                  * aren't then we can't use this combination and have
1708                  * to continue to the next.
1709                  */
1710                 if ((all_iftypes & used_iftypes) != used_iftypes)
1711                         goto cont;
1712
1713                 if (beacon_int_gcd) {
1714                         if (c->beacon_int_min_gcd &&
1715                             beacon_int_gcd < c->beacon_int_min_gcd)
1716                                 goto cont;
1717                         if (!c->beacon_int_min_gcd && beacon_int_different)
1718                                 goto cont;
1719                 }
1720
1721                 /* This combination covered all interface types and
1722                  * supported the requested numbers, so we're good.
1723                  */
1724
1725                 (*iter)(c, data);
1726  cont:
1727                 kfree(limits);
1728         }
1729
1730         return 0;
1731 }
1732 EXPORT_SYMBOL(cfg80211_iter_combinations);
1733
1734 static void
1735 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1736                           void *data)
1737 {
1738         int *num = data;
1739         (*num)++;
1740 }
1741
1742 int cfg80211_check_combinations(struct wiphy *wiphy,
1743                                 struct iface_combination_params *params)
1744 {
1745         int err, num = 0;
1746
1747         err = cfg80211_iter_combinations(wiphy, params,
1748                                          cfg80211_iter_sum_ifcombs, &num);
1749         if (err)
1750                 return err;
1751         if (num == 0)
1752                 return -EBUSY;
1753
1754         return 0;
1755 }
1756 EXPORT_SYMBOL(cfg80211_check_combinations);
1757
1758 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1759                            const u8 *rates, unsigned int n_rates,
1760                            u32 *mask)
1761 {
1762         int i, j;
1763
1764         if (!sband)
1765                 return -EINVAL;
1766
1767         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1768                 return -EINVAL;
1769
1770         *mask = 0;
1771
1772         for (i = 0; i < n_rates; i++) {
1773                 int rate = (rates[i] & 0x7f) * 5;
1774                 bool found = false;
1775
1776                 for (j = 0; j < sband->n_bitrates; j++) {
1777                         if (sband->bitrates[j].bitrate == rate) {
1778                                 found = true;
1779                                 *mask |= BIT(j);
1780                                 break;
1781                         }
1782                 }
1783                 if (!found)
1784                         return -EINVAL;
1785         }
1786
1787         /*
1788          * mask must have at least one bit set here since we
1789          * didn't accept a 0-length rates array nor allowed
1790          * entries in the array that didn't exist
1791          */
1792
1793         return 0;
1794 }
1795
1796 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1797 {
1798         enum nl80211_band band;
1799         unsigned int n_channels = 0;
1800
1801         for (band = 0; band < NUM_NL80211_BANDS; band++)
1802                 if (wiphy->bands[band])
1803                         n_channels += wiphy->bands[band]->n_channels;
1804
1805         return n_channels;
1806 }
1807 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1808
1809 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1810                          struct station_info *sinfo)
1811 {
1812         struct cfg80211_registered_device *rdev;
1813         struct wireless_dev *wdev;
1814
1815         wdev = dev->ieee80211_ptr;
1816         if (!wdev)
1817                 return -EOPNOTSUPP;
1818
1819         rdev = wiphy_to_rdev(wdev->wiphy);
1820         if (!rdev->ops->get_station)
1821                 return -EOPNOTSUPP;
1822
1823         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1824 }
1825 EXPORT_SYMBOL(cfg80211_get_station);
1826
1827 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1828 {
1829         int i;
1830
1831         if (!f)
1832                 return;
1833
1834         kfree(f->serv_spec_info);
1835         kfree(f->srf_bf);
1836         kfree(f->srf_macs);
1837         for (i = 0; i < f->num_rx_filters; i++)
1838                 kfree(f->rx_filters[i].filter);
1839
1840         for (i = 0; i < f->num_tx_filters; i++)
1841                 kfree(f->tx_filters[i].filter);
1842
1843         kfree(f->rx_filters);
1844         kfree(f->tx_filters);
1845         kfree(f);
1846 }
1847 EXPORT_SYMBOL(cfg80211_free_nan_func);
1848
1849 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1850                                 u32 center_freq_khz, u32 bw_khz)
1851 {
1852         u32 start_freq_khz, end_freq_khz;
1853
1854         start_freq_khz = center_freq_khz - (bw_khz / 2);
1855         end_freq_khz = center_freq_khz + (bw_khz / 2);
1856
1857         if (start_freq_khz >= freq_range->start_freq_khz &&
1858             end_freq_khz <= freq_range->end_freq_khz)
1859                 return true;
1860
1861         return false;
1862 }
1863
1864 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1865 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1866 const unsigned char rfc1042_header[] __aligned(2) =
1867         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1868 EXPORT_SYMBOL(rfc1042_header);
1869
1870 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1871 const unsigned char bridge_tunnel_header[] __aligned(2) =
1872         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1873 EXPORT_SYMBOL(bridge_tunnel_header);