net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7 #include <linux/export.h>
   8 #include <linux/bitops.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/slab.h>
  11 #include <net/cfg80211.h>
  12 #include <net/ip.h>
  13 #include <net/dsfield.h>
  14 #include <linux/if_vlan.h>
  15 #include <linux/mpls.h>
  16 #include "core.h"
  17 #include "rdev-ops.h"
  18
  19
  20 struct ieee80211_rate *
  21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  22                             u32 basic_rates, int bitrate)
  23 {
  24         struct ieee80211_rate *result = &sband->bitrates[0];
  25         int i;
  26
  27         for (i = 0; i < sband->n_bitrates; i++) {
  28                 if (!(basic_rates & BIT(i)))
  29                         continue;
  30                 if (sband->bitrates[i].bitrate > bitrate)
  31                         continue;
  32                 result = &sband->bitrates[i];
  33         }
  34
  35         return result;
  36 }
  37 EXPORT_SYMBOL(ieee80211_get_response_rate);
  38
  39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  40                               enum nl80211_bss_scan_width scan_width)
  41 {
  42         struct ieee80211_rate *bitrates;
  43         u32 mandatory_rates = 0;
  44         enum ieee80211_rate_flags mandatory_flag;
  45         int i;
  46
  47         if (WARN_ON(!sband))
  48                 return 1;
  49
  50         if (sband->band == IEEE80211_BAND_2GHZ) {
  51                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  52                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  53                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  54                 else
  55                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  56         } else {
  57                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  58         }
  59
  60         bitrates = sband->bitrates;
  61         for (i = 0; i < sband->n_bitrates; i++)
  62                 if (bitrates[i].flags & mandatory_flag)
  63                         mandatory_rates |= BIT(i);
  64         return mandatory_rates;
  65 }
  66 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  67
  68 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  69 {
  70         /* see 802.11 17.3.8.3.2 and Annex J
  71          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  72         if (chan <= 0)
  73                 return 0; /* not supported */
  74         switch (band) {
  75         case IEEE80211_BAND_2GHZ:
  76                 if (chan == 14)
  77                         return 2484;
  78                 else if (chan < 14)
  79                         return 2407 + chan * 5;
  80                 break;
  81         case IEEE80211_BAND_5GHZ:
  82                 if (chan >= 182 && chan <= 196)
  83                         return 4000 + chan * 5;
  84                 else
  85                         return 5000 + chan * 5;
  86                 break;
  87         case IEEE80211_BAND_60GHZ:
  88                 if (chan < 5)
  89                         return 56160 + chan * 2160;
  90                 break;
  91         default:
  92                 ;
  93         }
  94         return 0; /* not supported */
  95 }
  96 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  97
  98 int ieee80211_frequency_to_channel(int freq)
  99 {
 100         /* see 802.11 17.3.8.3.2 and Annex J */
 101         if (freq == 2484)
 102                 return 14;
 103         else if (freq < 2484)
 104                 return (freq - 2407) / 5;
 105         else if (freq >= 4910 && freq <= 4980)
 106                 return (freq - 4000) / 5;
 107         else if (freq <= 45000) /* DMG band lower limit */
 108                 return (freq - 5000) / 5;
 109         else if (freq >= 58320 && freq <= 64800)
 110                 return (freq - 56160) / 2160;
 111         else
 112                 return 0;
 113 }
 114 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 115
 116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 117                                                   int freq)
 118 {
 119         enum ieee80211_band band;
 120         struct ieee80211_supported_band *sband;
 121         int i;
 122
 123         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 124                 sband = wiphy->bands[band];
 125
 126                 if (!sband)
 127                         continue;
 128
 129                 for (i = 0; i < sband->n_channels; i++) {
 130                         if (sband->channels[i].center_freq == freq)
 131                                 return &sband->channels[i];
 132                 }
 133         }
 134
 135         return NULL;
 136 }
 137 EXPORT_SYMBOL(__ieee80211_get_channel);
 138
 139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 140                                      enum ieee80211_band band)
 141 {
 142         int i, want;
 143
 144         switch (band) {
 145         case IEEE80211_BAND_5GHZ:
 146                 want = 3;
 147                 for (i = 0; i < sband->n_bitrates; i++) {
 148                         if (sband->bitrates[i].bitrate == 60 ||
 149                             sband->bitrates[i].bitrate == 120 ||
 150                             sband->bitrates[i].bitrate == 240) {
 151                                 sband->bitrates[i].flags |=
 152                                         IEEE80211_RATE_MANDATORY_A;
 153                                 want--;
 154                         }
 155                 }
 156                 WARN_ON(want);
 157                 break;
 158         case IEEE80211_BAND_2GHZ:
 159                 want = 7;
 160                 for (i = 0; i < sband->n_bitrates; i++) {
 161                         if (sband->bitrates[i].bitrate == 10) {
 162                                 sband->bitrates[i].flags |=
 163                                         IEEE80211_RATE_MANDATORY_B |
 164                                         IEEE80211_RATE_MANDATORY_G;
 165                                 want--;
 166                         }
 167
 168                         if (sband->bitrates[i].bitrate == 20 ||
 169                             sband->bitrates[i].bitrate == 55 ||
 170                             sband->bitrates[i].bitrate == 110 ||
 171                             sband->bitrates[i].bitrate == 60 ||
 172                             sband->bitrates[i].bitrate == 120 ||
 173                             sband->bitrates[i].bitrate == 240) {
 174                                 sband->bitrates[i].flags |=
 175                                         IEEE80211_RATE_MANDATORY_G;
 176                                 want--;
 177                         }
 178
 179                         if (sband->bitrates[i].bitrate != 10 &&
 180                             sband->bitrates[i].bitrate != 20 &&
 181                             sband->bitrates[i].bitrate != 55 &&
 182                             sband->bitrates[i].bitrate != 110)
 183                                 sband->bitrates[i].flags |=
 184                                         IEEE80211_RATE_ERP_G;
 185                 }
 186                 WARN_ON(want != 0 && want != 3 && want != 6);
 187                 break;
 188         case IEEE80211_BAND_60GHZ:
 189                 /* check for mandatory HT MCS 1..4 */
 190                 WARN_ON(!sband->ht_cap.ht_supported);
 191                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 192                 break;
 193         case IEEE80211_NUM_BANDS:
 194                 WARN_ON(1);
 195                 break;
 196         }
 197 }
 198
 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 200 {
 201         enum ieee80211_band band;
 202
 203         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 204                 if (wiphy->bands[band])
 205                         set_mandatory_flags_band(wiphy->bands[band], band);
 206 }
 207
 208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 209 {
 210         int i;
 211         for (i = 0; i < wiphy->n_cipher_suites; i++)
 212                 if (cipher == wiphy->cipher_suites[i])
 213                         return true;
 214         return false;
 215 }
 216
 217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 218                                    struct key_params *params, int key_idx,
 219                                    bool pairwise, const u8 *mac_addr)
 220 {
 221         if (key_idx > 5)
 222                 return -EINVAL;
 223
 224         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 225                 return -EINVAL;
 226
 227         if (pairwise && !mac_addr)
 228                 return -EINVAL;
 229
 230         switch (params->cipher) {
 231         case WLAN_CIPHER_SUITE_TKIP:
 232         case WLAN_CIPHER_SUITE_CCMP:
 233         case WLAN_CIPHER_SUITE_CCMP_256:
 234         case WLAN_CIPHER_SUITE_GCMP:
 235         case WLAN_CIPHER_SUITE_GCMP_256:
 236                 /* Disallow pairwise keys with non-zero index unless it's WEP
 237                  * or a vendor specific cipher (because current deployments use
 238                  * pairwise WEP keys with non-zero indices and for vendor
 239                  * specific ciphers this should be validated in the driver or
 240                  * hardware level - but 802.11i clearly specifies to use zero)
 241                  */
 242                 if (pairwise && key_idx)
 243                         return -EINVAL;
 244                 break;
 245         case WLAN_CIPHER_SUITE_AES_CMAC:
 246         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 247         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 248         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 249                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 250                 if (pairwise)
 251                         return -EINVAL;
 252                 break;
 253         default:
 254                 break;
 255         }
 256
 257         switch (params->cipher) {
 258         case WLAN_CIPHER_SUITE_WEP40:
 259                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 260                         return -EINVAL;
 261                 break;
 262         case WLAN_CIPHER_SUITE_TKIP:
 263                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 264                         return -EINVAL;
 265                 break;
 266         case WLAN_CIPHER_SUITE_CCMP:
 267                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 268                         return -EINVAL;
 269                 break;
 270         case WLAN_CIPHER_SUITE_CCMP_256:
 271                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 272                         return -EINVAL;
 273                 break;
 274         case WLAN_CIPHER_SUITE_GCMP:
 275                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 276                         return -EINVAL;
 277                 break;
 278         case WLAN_CIPHER_SUITE_GCMP_256:
 279                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 280                         return -EINVAL;
 281                 break;
 282         case WLAN_CIPHER_SUITE_WEP104:
 283                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 284                         return -EINVAL;
 285                 break;
 286         case WLAN_CIPHER_SUITE_AES_CMAC:
 287                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 288                         return -EINVAL;
 289                 break;
 290         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 291                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 292                         return -EINVAL;
 293                 break;
 294         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 295                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 296                         return -EINVAL;
 297                 break;
 298         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 299                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 300                         return -EINVAL;
 301                 break;
 302         default:
 303                 /*
 304                  * We don't know anything about this algorithm,
 305                  * allow using it -- but the driver must check
 306                  * all parameters! We still check below whether
 307                  * or not the driver supports this algorithm,
 308                  * of course.
 309                  */
 310                 break;
 311         }
 312
 313         if (params->seq) {
 314                 switch (params->cipher) {
 315                 case WLAN_CIPHER_SUITE_WEP40:
 316                 case WLAN_CIPHER_SUITE_WEP104:
 317                         /* These ciphers do not use key sequence */
 318                         return -EINVAL;
 319                 case WLAN_CIPHER_SUITE_TKIP:
 320                 case WLAN_CIPHER_SUITE_CCMP:
 321                 case WLAN_CIPHER_SUITE_CCMP_256:
 322                 case WLAN_CIPHER_SUITE_GCMP:
 323                 case WLAN_CIPHER_SUITE_GCMP_256:
 324                 case WLAN_CIPHER_SUITE_AES_CMAC:
 325                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 326                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 327                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 328                         if (params->seq_len != 6)
 329                                 return -EINVAL;
 330                         break;
 331                 }
 332         }
 333
 334         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 335                 return -EINVAL;
 336
 337         return 0;
 338 }
 339
 340 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 341 {
 342         unsigned int hdrlen = 24;
 343
 344         if (ieee80211_is_data(fc)) {
 345                 if (ieee80211_has_a4(fc))
 346                         hdrlen = 30;
 347                 if (ieee80211_is_data_qos(fc)) {
 348                         hdrlen += IEEE80211_QOS_CTL_LEN;
 349                         if (ieee80211_has_order(fc))
 350                                 hdrlen += IEEE80211_HT_CTL_LEN;
 351                 }
 352                 goto out;
 353         }
 354
 355         if (ieee80211_is_mgmt(fc)) {
 356                 if (ieee80211_has_order(fc))
 357                         hdrlen += IEEE80211_HT_CTL_LEN;
 358                 goto out;
 359         }
 360
 361         if (ieee80211_is_ctl(fc)) {
 362                 /*
 363                  * ACK and CTS are 10 bytes, all others 16. To see how
 364                  * to get this condition consider
 365                  *   subtype mask:   0b0000000011110000 (0x00F0)
 366                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 367                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 368                  *   bits that matter:         ^^^      (0x00E0)
 369                  *   value of those: 0b0000000011000000 (0x00C0)
 370                  */
 371                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 372                         hdrlen = 10;
 373                 else
 374                         hdrlen = 16;
 375         }
 376 out:
 377         return hdrlen;
 378 }
 379 EXPORT_SYMBOL(ieee80211_hdrlen);
 380
 381 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 382 {
 383         const struct ieee80211_hdr *hdr =
 384                         (const struct ieee80211_hdr *)skb->data;
 385         unsigned int hdrlen;
 386
 387         if (unlikely(skb->len < 10))
 388                 return 0;
 389         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 390         if (unlikely(hdrlen > skb->len))
 391                 return 0;
 392         return hdrlen;
 393 }
 394 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 395
 396 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 397 {
 398         int ae = meshhdr->flags & MESH_FLAGS_AE;
 399         /* 802.11-2012, 8.2.4.7.3 */
 400         switch (ae) {
 401         default:
 402         case 0:
 403                 return 6;
 404         case MESH_FLAGS_AE_A4:
 405                 return 12;
 406         case MESH_FLAGS_AE_A5_A6:
 407                 return 18;
 408         }
 409 }
 410 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 411
 412 static int __ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 413                                     enum nl80211_iftype iftype, bool is_amsdu)
 414 {
 415         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 416         u16 hdrlen, ethertype;
 417         u8 *payload;
 418         u8 dst[ETH_ALEN];
 419         u8 src[ETH_ALEN] __aligned(2);
 420
 421         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 422                 return -1;
 423
 424         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 425
 426         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 427          * header
 428          * IEEE 802.11 address fields:
 429          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 430          *   0     0   DA    SA    BSSID n/a
 431          *   0     1   DA    BSSID SA    n/a
 432          *   1     0   BSSID SA    DA    n/a
 433          *   1     1   RA    TA    DA    SA
 434          */
 435         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 436         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 437
 438         switch (hdr->frame_control &
 439                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 440         case cpu_to_le16(IEEE80211_FCTL_TODS):
 441                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 442                              iftype != NL80211_IFTYPE_AP_VLAN &&
 443                              iftype != NL80211_IFTYPE_P2P_GO))
 444                         return -1;
 445                 break;
 446         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 447                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 448                              iftype != NL80211_IFTYPE_MESH_POINT &&
 449                              iftype != NL80211_IFTYPE_AP_VLAN &&
 450                              iftype != NL80211_IFTYPE_STATION))
 451                         return -1;
 452                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 453                         struct ieee80211s_hdr *meshdr =
 454                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 455                         /* make sure meshdr->flags is on the linear part */
 456                         if (!pskb_may_pull(skb, hdrlen + 1))
 457                                 return -1;
 458                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 459                                 return -1;
 460                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 461                                 skb_copy_bits(skb, hdrlen +
 462                                         offsetof(struct ieee80211s_hdr, eaddr1),
 463                                         dst, ETH_ALEN);
 464                                 skb_copy_bits(skb, hdrlen +
 465                                         offsetof(struct ieee80211s_hdr, eaddr2),
 466                                         src, ETH_ALEN);
 467                         }
 468                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 469                 }
 470                 break;
 471         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 472                 if ((iftype != NL80211_IFTYPE_STATION &&
 473                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 474                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 475                     (is_multicast_ether_addr(dst) &&
 476                      ether_addr_equal(src, addr)))
 477                         return -1;
 478                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 479                         struct ieee80211s_hdr *meshdr =
 480                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 481                         /* make sure meshdr->flags is on the linear part */
 482                         if (!pskb_may_pull(skb, hdrlen + 1))
 483                                 return -1;
 484                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 485                                 return -1;
 486                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 487                                 skb_copy_bits(skb, hdrlen +
 488                                         offsetof(struct ieee80211s_hdr, eaddr1),
 489                                         src, ETH_ALEN);
 490                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 491                 }
 492                 break;
 493         case cpu_to_le16(0):
 494                 if (iftype != NL80211_IFTYPE_ADHOC &&
 495                     iftype != NL80211_IFTYPE_STATION &&
 496                     iftype != NL80211_IFTYPE_OCB)
 497                                 return -1;
 498                 break;
 499         }
 500
 501         if (!pskb_may_pull(skb, hdrlen + 8))
 502                 return -1;
 503
 504         payload = skb->data + hdrlen;
 505         ethertype = (payload[6] << 8) | payload[7];
 506
 507         if (likely((!is_amsdu && ether_addr_equal(payload, rfc1042_header) &&
 508                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 509                    ether_addr_equal(payload, bridge_tunnel_header))) {
 510                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 511                  * replace EtherType */
 512                 skb_pull(skb, hdrlen + 6);
 513                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 514                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 515         } else {
 516                 struct ethhdr *ehdr;
 517                 __be16 len;
 518
 519                 skb_pull(skb, hdrlen);
 520                 len = htons(skb->len);
 521                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 522                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 523                 memcpy(ehdr->h_source, src, ETH_ALEN);
 524                 ehdr->h_proto = len;
 525         }
 526         return 0;
 527 }
 528
 529 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 530                            enum nl80211_iftype iftype)
 531 {
 532         return __ieee80211_data_to_8023(skb, addr, iftype, false);
 533 }
 534 EXPORT_SYMBOL(ieee80211_data_to_8023);
 535
 536 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 537                              enum nl80211_iftype iftype,
 538                              const u8 *bssid, bool qos)
 539 {
 540         struct ieee80211_hdr hdr;
 541         u16 hdrlen, ethertype;
 542         __le16 fc;
 543         const u8 *encaps_data;
 544         int encaps_len, skip_header_bytes;
 545         int nh_pos, h_pos;
 546         int head_need;
 547
 548         if (unlikely(skb->len < ETH_HLEN))
 549                 return -EINVAL;
 550
 551         nh_pos = skb_network_header(skb) - skb->data;
 552         h_pos = skb_transport_header(skb) - skb->data;
 553
 554         /* convert Ethernet header to proper 802.11 header (based on
 555          * operation mode) */
 556         ethertype = (skb->data[12] << 8) | skb->data[13];
 557         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 558
 559         switch (iftype) {
 560         case NL80211_IFTYPE_AP:
 561         case NL80211_IFTYPE_AP_VLAN:
 562         case NL80211_IFTYPE_P2P_GO:
 563                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 564                 /* DA BSSID SA */
 565                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 566                 memcpy(hdr.addr2, addr, ETH_ALEN);
 567                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 568                 hdrlen = 24;
 569                 break;
 570         case NL80211_IFTYPE_STATION:
 571         case NL80211_IFTYPE_P2P_CLIENT:
 572                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 573                 /* BSSID SA DA */
 574                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 575                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 576                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 577                 hdrlen = 24;
 578                 break;
 579         case NL80211_IFTYPE_OCB:
 580         case NL80211_IFTYPE_ADHOC:
 581                 /* DA SA BSSID */
 582                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 583                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 584                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 585                 hdrlen = 24;
 586                 break;
 587         default:
 588                 return -EOPNOTSUPP;
 589         }
 590
 591         if (qos) {
 592                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 593                 hdrlen += 2;
 594         }
 595
 596         hdr.frame_control = fc;
 597         hdr.duration_id = 0;
 598         hdr.seq_ctrl = 0;
 599
 600         skip_header_bytes = ETH_HLEN;
 601         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 602                 encaps_data = bridge_tunnel_header;
 603                 encaps_len = sizeof(bridge_tunnel_header);
 604                 skip_header_bytes -= 2;
 605         } else if (ethertype >= ETH_P_802_3_MIN) {
 606                 encaps_data = rfc1042_header;
 607                 encaps_len = sizeof(rfc1042_header);
 608                 skip_header_bytes -= 2;
 609         } else {
 610                 encaps_data = NULL;
 611                 encaps_len = 0;
 612         }
 613
 614         skb_pull(skb, skip_header_bytes);
 615         nh_pos -= skip_header_bytes;
 616         h_pos -= skip_header_bytes;
 617
 618         head_need = hdrlen + encaps_len - skb_headroom(skb);
 619
 620         if (head_need > 0 || skb_cloned(skb)) {
 621                 head_need = max(head_need, 0);
 622                 if (head_need)
 623                         skb_orphan(skb);
 624
 625                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 626                         return -ENOMEM;
 627
 628                 skb->truesize += head_need;
 629         }
 630
 631         if (encaps_data) {
 632                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 633                 nh_pos += encaps_len;
 634                 h_pos += encaps_len;
 635         }
 636
 637         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 638
 639         nh_pos += hdrlen;
 640         h_pos += hdrlen;
 641
 642         /* Update skb pointers to various headers since this modified frame
 643          * is going to go through Linux networking code that may potentially
 644          * need things like pointer to IP header. */
 645         skb_set_mac_header(skb, 0);
 646         skb_set_network_header(skb, nh_pos);
 647         skb_set_transport_header(skb, h_pos);
 648
 649         return 0;
 650 }
 651 EXPORT_SYMBOL(ieee80211_data_from_8023);
 652
 653
 654 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 655                               const u8 *addr, enum nl80211_iftype iftype,
 656                               const unsigned int extra_headroom,
 657                               bool has_80211_header)
 658 {
 659         struct sk_buff *frame = NULL;
 660         u16 ethertype;
 661         u8 *payload;
 662         const struct ethhdr *eth;
 663         int remaining, err;
 664         u8 dst[ETH_ALEN], src[ETH_ALEN];
 665
 666         if (has_80211_header) {
 667                 err = ieee80211_data_to_8023(skb, addr, iftype);
 668                 if (err)
 669                         goto out;
 670
 671                 /* skip the wrapping header */
 672                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 673                 if (!eth)
 674                         goto out;
 675         } else {
 676                 eth = (struct ethhdr *) skb->data;
 677         }
 678
 679         while (skb != frame) {
 680                 u8 padding;
 681                 __be16 len = eth->h_proto;
 682                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 683
 684                 remaining = skb->len;
 685                 memcpy(dst, eth->h_dest, ETH_ALEN);
 686                 memcpy(src, eth->h_source, ETH_ALEN);
 687
 688                 padding = (4 - subframe_len) & 0x3;
 689                 /* the last MSDU has no padding */
 690                 if (subframe_len > remaining)
 691                         goto purge;
 692                 /* mitigate A-MSDU aggregation injection attacks */
 693                 if (ether_addr_equal(eth->h_dest, rfc1042_header))
 694                         goto purge;
 695
 696                 skb_pull(skb, sizeof(struct ethhdr));
 697                 /* reuse skb for the last subframe */
 698                 if (remaining <= subframe_len + padding)
 699                         frame = skb;
 700                 else {
 701                         unsigned int hlen = ALIGN(extra_headroom, 4);
 702                         /*
 703                          * Allocate and reserve two bytes more for payload
 704                          * alignment since sizeof(struct ethhdr) is 14.
 705                          */
 706                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 707                         if (!frame)
 708                                 goto purge;
 709
 710                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 711                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 712                                 ntohs(len));
 713
 714                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 715                                                         padding);
 716                         if (!eth) {
 717                                 dev_kfree_skb(frame);
 718                                 goto purge;
 719                         }
 720                 }
 721
 722                 skb_reset_network_header(frame);
 723                 frame->dev = skb->dev;
 724                 frame->priority = skb->priority;
 725
 726                 payload = frame->data;
 727                 ethertype = (payload[6] << 8) | payload[7];
 728
 729                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 730                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 731                            ether_addr_equal(payload, bridge_tunnel_header))) {
 732                         /* remove RFC1042 or Bridge-Tunnel
 733                          * encapsulation and replace EtherType */
 734                         skb_pull(frame, 6);
 735                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 736                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 737                 } else {
 738                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 739                                 sizeof(__be16));
 740                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 741                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 742                 }
 743                 __skb_queue_tail(list, frame);
 744         }
 745
 746         return;
 747
 748  purge:
 749         __skb_queue_purge(list);
 750  out:
 751         dev_kfree_skb(skb);
 752 }
 753 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 754
 755 /* Given a data frame determine the 802.1p/1d tag to use. */
 756 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 757                                     struct cfg80211_qos_map *qos_map)
 758 {
 759         unsigned int dscp;
 760         unsigned char vlan_priority;
 761
 762         /* skb->priority values from 256->263 are magic values to
 763          * directly indicate a specific 802.1d priority.  This is used
 764          * to allow 802.1d priority to be passed directly in from VLAN
 765          * tags, etc.
 766          */
 767         if (skb->priority >= 256 && skb->priority <= 263)
 768                 return skb->priority - 256;
 769
 770         if (skb_vlan_tag_present(skb)) {
 771                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 772                         >> VLAN_PRIO_SHIFT;
 773                 if (vlan_priority > 0)
 774                         return vlan_priority;
 775         }
 776
 777         switch (skb->protocol) {
 778         case htons(ETH_P_IP):
 779                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 780                 break;
 781         case htons(ETH_P_IPV6):
 782                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 783                 break;
 784         case htons(ETH_P_MPLS_UC):
 785         case htons(ETH_P_MPLS_MC): {
 786                 struct mpls_label mpls_tmp, *mpls;
 787
 788                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 789                                           sizeof(*mpls), &mpls_tmp);
 790                 if (!mpls)
 791                         return 0;
 792
 793                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 794                         >> MPLS_LS_TC_SHIFT;
 795         }
 796         case htons(ETH_P_80221):
 797                 /* 802.21 is always network control traffic */
 798                 return 7;
 799         default:
 800                 return 0;
 801         }
 802
 803         if (qos_map) {
 804                 unsigned int i, tmp_dscp = dscp >> 2;
 805
 806                 for (i = 0; i < qos_map->num_des; i++) {
 807                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 808                                 return qos_map->dscp_exception[i].up;
 809                 }
 810
 811                 for (i = 0; i < 8; i++) {
 812                         if (tmp_dscp >= qos_map->up[i].low &&
 813                             tmp_dscp <= qos_map->up[i].high)
 814                                 return i;
 815                 }
 816         }
 817
 818         return dscp >> 5;
 819 }
 820 EXPORT_SYMBOL(cfg80211_classify8021d);
 821
 822 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 823 {
 824         const struct cfg80211_bss_ies *ies;
 825
 826         ies = rcu_dereference(bss->ies);
 827         if (!ies)
 828                 return NULL;
 829
 830         return cfg80211_find_ie(ie, ies->data, ies->len);
 831 }
 832 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 833
 834 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 835 {
 836         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 837         struct net_device *dev = wdev->netdev;
 838         int i;
 839
 840         if (!wdev->connect_keys)
 841                 return;
 842
 843         for (i = 0; i < 6; i++) {
 844                 if (!wdev->connect_keys->params[i].cipher)
 845                         continue;
 846                 if (rdev_add_key(rdev, dev, i, false, NULL,
 847                                  &wdev->connect_keys->params[i])) {
 848                         netdev_err(dev, "failed to set key %d\n", i);
 849                         continue;
 850                 }
 851                 if (wdev->connect_keys->def == i)
 852                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 853                                 netdev_err(dev, "failed to set defkey %d\n", i);
 854                                 continue;
 855                         }
 856                 if (wdev->connect_keys->defmgmt == i)
 857                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 858                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 859         }
 860
 861         kzfree(wdev->connect_keys);
 862         wdev->connect_keys = NULL;
 863 }
 864
 865 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 866 {
 867         struct cfg80211_event *ev;
 868         unsigned long flags;
 869         const u8 *bssid = NULL;
 870
 871         spin_lock_irqsave(&wdev->event_lock, flags);
 872         while (!list_empty(&wdev->event_list)) {
 873                 ev = list_first_entry(&wdev->event_list,
 874                                       struct cfg80211_event, list);
 875                 list_del(&ev->list);
 876                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 877
 878                 wdev_lock(wdev);
 879                 switch (ev->type) {
 880                 case EVENT_CONNECT_RESULT:
 881                         if (!is_zero_ether_addr(ev->cr.bssid))
 882                                 bssid = ev->cr.bssid;
 883                         __cfg80211_connect_result(
 884                                 wdev->netdev, bssid,
 885                                 ev->cr.req_ie, ev->cr.req_ie_len,
 886                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 887                                 ev->cr.status,
 888                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 889                                 NULL);
 890                         break;
 891                 case EVENT_ROAMED:
 892                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 893                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 894                                           ev->rm.resp_ie_len);
 895                         break;
 896                 case EVENT_DISCONNECTED:
 897                         __cfg80211_disconnected(wdev->netdev,
 898                                                 ev->dc.ie, ev->dc.ie_len,
 899                                                 ev->dc.reason,
 900                                                 !ev->dc.locally_generated);
 901                         break;
 902                 case EVENT_IBSS_JOINED:
 903                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 904                                                ev->ij.channel);
 905                         break;
 906                 case EVENT_STOPPED:
 907                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 908                         break;
 909                 }
 910                 wdev_unlock(wdev);
 911
 912                 kfree(ev);
 913
 914                 spin_lock_irqsave(&wdev->event_lock, flags);
 915         }
 916         spin_unlock_irqrestore(&wdev->event_lock, flags);
 917 }
 918
 919 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 920 {
 921         struct wireless_dev *wdev;
 922
 923         ASSERT_RTNL();
 924
 925         list_for_each_entry(wdev, &rdev->wdev_list, list)
 926                 cfg80211_process_wdev_events(wdev);
 927 }
 928
 929 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 930                           struct net_device *dev, enum nl80211_iftype ntype,
 931                           u32 *flags, struct vif_params *params)
 932 {
 933         int err;
 934         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 935
 936         ASSERT_RTNL();
 937
 938         /* don't support changing VLANs, you just re-create them */
 939         if (otype == NL80211_IFTYPE_AP_VLAN)
 940                 return -EOPNOTSUPP;
 941
 942         /* cannot change into P2P device type */
 943         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 944                 return -EOPNOTSUPP;
 945
 946         if (!rdev->ops->change_virtual_intf ||
 947             !(rdev->wiphy.interface_modes & (1 << ntype)))
 948                 return -EOPNOTSUPP;
 949
 950         /* if it's part of a bridge, reject changing type to station/ibss */
 951         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 952             (ntype == NL80211_IFTYPE_ADHOC ||
 953              ntype == NL80211_IFTYPE_STATION ||
 954              ntype == NL80211_IFTYPE_P2P_CLIENT))
 955                 return -EBUSY;
 956
 957         if (ntype != otype) {
 958                 dev->ieee80211_ptr->use_4addr = false;
 959                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 960                 wdev_lock(dev->ieee80211_ptr);
 961                 rdev_set_qos_map(rdev, dev, NULL);
 962                 wdev_unlock(dev->ieee80211_ptr);
 963
 964                 switch (otype) {
 965                 case NL80211_IFTYPE_AP:
 966                         cfg80211_stop_ap(rdev, dev, true);
 967                         break;
 968                 case NL80211_IFTYPE_ADHOC:
 969                         cfg80211_leave_ibss(rdev, dev, false);
 970                         break;
 971                 case NL80211_IFTYPE_STATION:
 972                 case NL80211_IFTYPE_P2P_CLIENT:
 973                         wdev_lock(dev->ieee80211_ptr);
 974                         cfg80211_disconnect(rdev, dev,
 975                                             WLAN_REASON_DEAUTH_LEAVING, true);
 976                         wdev_unlock(dev->ieee80211_ptr);
 977                         break;
 978                 case NL80211_IFTYPE_MESH_POINT:
 979                         /* mesh should be handled? */
 980                         break;
 981                 case NL80211_IFTYPE_OCB:
 982                         cfg80211_leave_ocb(rdev, dev);
 983                         break;
 984                 default:
 985                         break;
 986                 }
 987
 988                 cfg80211_process_rdev_events(rdev);
 989                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
 990         }
 991
 992         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 993
 994         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 995
 996         if (!err && params && params->use_4addr != -1)
 997                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 998
 999         if (!err) {
1000                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1001                 switch (ntype) {
1002                 case NL80211_IFTYPE_STATION:
1003                         if (dev->ieee80211_ptr->use_4addr)
1004                                 break;
1005                         /* fall through */
1006                 case NL80211_IFTYPE_OCB:
1007                 case NL80211_IFTYPE_P2P_CLIENT:
1008                 case NL80211_IFTYPE_ADHOC:
1009                         dev->priv_flags |= IFF_DONT_BRIDGE;
1010                         break;
1011                 case NL80211_IFTYPE_P2P_GO:
1012                 case NL80211_IFTYPE_AP:
1013                 case NL80211_IFTYPE_AP_VLAN:
1014                 case NL80211_IFTYPE_WDS:
1015                 case NL80211_IFTYPE_MESH_POINT:
1016                         /* bridging OK */
1017                         break;
1018                 case NL80211_IFTYPE_MONITOR:
1019                         /* monitor can't bridge anyway */
1020                         break;
1021                 case NL80211_IFTYPE_UNSPECIFIED:
1022                 case NUM_NL80211_IFTYPES:
1023                         /* not happening */
1024                         break;
1025                 case NL80211_IFTYPE_P2P_DEVICE:
1026                         WARN_ON(1);
1027                         break;
1028                 }
1029         }
1030
1031         if (!err && ntype != otype && netif_running(dev)) {
1032                 cfg80211_update_iface_num(rdev, ntype, 1);
1033                 cfg80211_update_iface_num(rdev, otype, -1);
1034         }
1035
1036         return err;
1037 }
1038
1039 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1040 {
1041         static const u32 __mcs2bitrate[] = {
1042                 /* control PHY */
1043                 [0] =   275,
1044                 /* SC PHY */
1045                 [1] =  3850,
1046                 [2] =  7700,
1047                 [3] =  9625,
1048                 [4] = 11550,
1049                 [5] = 12512, /* 1251.25 mbps */
1050                 [6] = 15400,
1051                 [7] = 19250,
1052                 [8] = 23100,
1053                 [9] = 25025,
1054                 [10] = 30800,
1055                 [11] = 38500,
1056                 [12] = 46200,
1057                 /* OFDM PHY */
1058                 [13] =  6930,
1059                 [14] =  8662, /* 866.25 mbps */
1060                 [15] = 13860,
1061                 [16] = 17325,
1062                 [17] = 20790,
1063                 [18] = 27720,
1064                 [19] = 34650,
1065                 [20] = 41580,
1066                 [21] = 45045,
1067                 [22] = 51975,
1068                 [23] = 62370,
1069                 [24] = 67568, /* 6756.75 mbps */
1070                 /* LP-SC PHY */
1071                 [25] =  6260,
1072                 [26] =  8340,
1073                 [27] = 11120,
1074                 [28] = 12510,
1075                 [29] = 16680,
1076                 [30] = 22240,
1077                 [31] = 25030,
1078         };
1079
1080         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1081                 return 0;
1082
1083         return __mcs2bitrate[rate->mcs];
1084 }
1085
1086 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1087 {
1088         static const u32 base[4][10] = {
1089                 {   6500000,
1090                    13000000,
1091                    19500000,
1092                    26000000,
1093                    39000000,
1094                    52000000,
1095                    58500000,
1096                    65000000,
1097                    78000000,
1098                    0,
1099                 },
1100                 {  13500000,
1101                    27000000,
1102                    40500000,
1103                    54000000,
1104                    81000000,
1105                   108000000,
1106                   121500000,
1107                   135000000,
1108                   162000000,
1109                   180000000,
1110                 },
1111                 {  29300000,
1112                    58500000,
1113                    87800000,
1114                   117000000,
1115                   175500000,
1116                   234000000,
1117                   263300000,
1118                   292500000,
1119                   351000000,
1120                   390000000,
1121                 },
1122                 {  58500000,
1123                   117000000,
1124                   175500000,
1125                   234000000,
1126                   351000000,
1127                   468000000,
1128                   526500000,
1129                   585000000,
1130                   702000000,
1131                   780000000,
1132                 },
1133         };
1134         u32 bitrate;
1135         int idx;
1136
1137         if (WARN_ON_ONCE(rate->mcs > 9))
1138                 return 0;
1139
1140         switch (rate->bw) {
1141         case RATE_INFO_BW_160:
1142                 idx = 3;
1143                 break;
1144         case RATE_INFO_BW_80:
1145                 idx = 2;
1146                 break;
1147         case RATE_INFO_BW_40:
1148                 idx = 1;
1149                 break;
1150         case RATE_INFO_BW_5:
1151         case RATE_INFO_BW_10:
1152         default:
1153                 WARN_ON(1);
1154                 /* fall through */
1155         case RATE_INFO_BW_20:
1156                 idx = 0;
1157         }
1158
1159         bitrate = base[idx][rate->mcs];
1160         bitrate *= rate->nss;
1161
1162         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1163                 bitrate = (bitrate / 9) * 10;
1164
1165         /* do NOT round down here */
1166         return (bitrate + 50000) / 100000;
1167 }
1168
1169 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1170 {
1171         int modulation, streams, bitrate;
1172
1173         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1174             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1175                 return rate->legacy;
1176         if (rate->flags & RATE_INFO_FLAGS_60G)
1177                 return cfg80211_calculate_bitrate_60g(rate);
1178         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1179                 return cfg80211_calculate_bitrate_vht(rate);
1180
1181         /* the formula below does only work for MCS values smaller than 32 */
1182         if (WARN_ON_ONCE(rate->mcs >= 32))
1183                 return 0;
1184
1185         modulation = rate->mcs & 7;
1186         streams = (rate->mcs >> 3) + 1;
1187
1188         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1189
1190         if (modulation < 4)
1191                 bitrate *= (modulation + 1);
1192         else if (modulation == 4)
1193                 bitrate *= (modulation + 2);
1194         else
1195                 bitrate *= (modulation + 3);
1196
1197         bitrate *= streams;
1198
1199         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1200                 bitrate = (bitrate / 9) * 10;
1201
1202         /* do NOT round down here */
1203         return (bitrate + 50000) / 100000;
1204 }
1205 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1206
1207 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1208                           enum ieee80211_p2p_attr_id attr,
1209                           u8 *buf, unsigned int bufsize)
1210 {
1211         u8 *out = buf;
1212         u16 attr_remaining = 0;
1213         bool desired_attr = false;
1214         u16 desired_len = 0;
1215
1216         while (len > 0) {
1217                 unsigned int iedatalen;
1218                 unsigned int copy;
1219                 const u8 *iedata;
1220
1221                 if (len < 2)
1222                         return -EILSEQ;
1223                 iedatalen = ies[1];
1224                 if (iedatalen + 2 > len)
1225                         return -EILSEQ;
1226
1227                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1228                         goto cont;
1229
1230                 if (iedatalen < 4)
1231                         goto cont;
1232
1233                 iedata = ies + 2;
1234
1235                 /* check WFA OUI, P2P subtype */
1236                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1237                     iedata[2] != 0x9a || iedata[3] != 0x09)
1238                         goto cont;
1239
1240                 iedatalen -= 4;
1241                 iedata += 4;
1242
1243                 /* check attribute continuation into this IE */
1244                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1245                 if (copy && desired_attr) {
1246                         desired_len += copy;
1247                         if (out) {
1248                                 memcpy(out, iedata, min(bufsize, copy));
1249                                 out += min(bufsize, copy);
1250                                 bufsize -= min(bufsize, copy);
1251                         }
1252
1253
1254                         if (copy == attr_remaining)
1255                                 return desired_len;
1256                 }
1257
1258                 attr_remaining -= copy;
1259                 if (attr_remaining)
1260                         goto cont;
1261
1262                 iedatalen -= copy;
1263                 iedata += copy;
1264
1265                 while (iedatalen > 0) {
1266                         u16 attr_len;
1267
1268                         /* P2P attribute ID & size must fit */
1269                         if (iedatalen < 3)
1270                                 return -EILSEQ;
1271                         desired_attr = iedata[0] == attr;
1272                         attr_len = get_unaligned_le16(iedata + 1);
1273                         iedatalen -= 3;
1274                         iedata += 3;
1275
1276                         copy = min_t(unsigned int, attr_len, iedatalen);
1277
1278                         if (desired_attr) {
1279                                 desired_len += copy;
1280                                 if (out) {
1281                                         memcpy(out, iedata, min(bufsize, copy));
1282                                         out += min(bufsize, copy);
1283                                         bufsize -= min(bufsize, copy);
1284                                 }
1285
1286                                 if (copy == attr_len)
1287                                         return desired_len;
1288                         }
1289
1290                         iedata += copy;
1291                         iedatalen -= copy;
1292                         attr_remaining = attr_len - copy;
1293                 }
1294
1295  cont:
1296                 len -= ies[1] + 2;
1297                 ies += ies[1] + 2;
1298         }
1299
1300         if (attr_remaining && desired_attr)
1301                 return -EILSEQ;
1302
1303         return -ENOENT;
1304 }
1305 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1306
1307 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1308 {
1309         int i;
1310
1311         for (i = 0; i < n_ids; i++)
1312                 if (ids[i] == id)
1313                         return true;
1314         return false;
1315 }
1316
1317 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1318                               const u8 *ids, int n_ids,
1319                               const u8 *after_ric, int n_after_ric,
1320                               size_t offset)
1321 {
1322         size_t pos = offset;
1323
1324         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1325                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1326                         pos += 2 + ies[pos + 1];
1327
1328                         while (pos < ielen &&
1329                                !ieee80211_id_in_list(after_ric, n_after_ric,
1330                                                      ies[pos]))
1331                                 pos += 2 + ies[pos + 1];
1332                 } else {
1333                         pos += 2 + ies[pos + 1];
1334                 }
1335         }
1336
1337         return pos;
1338 }
1339 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1340
1341 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1342                           const u8 *ids, int n_ids, size_t offset)
1343 {
1344         return ieee80211_ie_split_ric(ies, ielen, ids, n_ids, NULL, 0, offset);
1345 }
1346 EXPORT_SYMBOL(ieee80211_ie_split);
1347
1348 bool ieee80211_operating_class_to_band(u8 operating_class,
1349                                        enum ieee80211_band *band)
1350 {
1351         switch (operating_class) {
1352         case 112:
1353         case 115 ... 127:
1354         case 128 ... 130:
1355                 *band = IEEE80211_BAND_5GHZ;
1356                 return true;
1357         case 81:
1358         case 82:
1359         case 83:
1360         case 84:
1361                 *band = IEEE80211_BAND_2GHZ;
1362                 return true;
1363         case 180:
1364                 *band = IEEE80211_BAND_60GHZ;
1365                 return true;
1366         }
1367
1368         return false;
1369 }
1370 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1371
1372 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1373                                           u8 *op_class)
1374 {
1375         u8 vht_opclass;
1376         u32 freq = chandef->center_freq1;
1377
1378         if (freq >= 2412 && freq <= 2472) {
1379                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1380                         return false;
1381
1382                 /* 2.407 GHz, channels 1..13 */
1383                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1384                         if (freq > chandef->chan->center_freq)
1385                                 *op_class = 83; /* HT40+ */
1386                         else
1387                                 *op_class = 84; /* HT40- */
1388                 } else {
1389                         *op_class = 81;
1390                 }
1391
1392                 return true;
1393         }
1394
1395         if (freq == 2484) {
1396                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1397                         return false;
1398
1399                 *op_class = 82; /* channel 14 */
1400                 return true;
1401         }
1402
1403         switch (chandef->width) {
1404         case NL80211_CHAN_WIDTH_80:
1405                 vht_opclass = 128;
1406                 break;
1407         case NL80211_CHAN_WIDTH_160:
1408                 vht_opclass = 129;
1409                 break;
1410         case NL80211_CHAN_WIDTH_80P80:
1411                 vht_opclass = 130;
1412                 break;
1413         case NL80211_CHAN_WIDTH_10:
1414         case NL80211_CHAN_WIDTH_5:
1415                 return false; /* unsupported for now */
1416         default:
1417                 vht_opclass = 0;
1418                 break;
1419         }
1420
1421         /* 5 GHz, channels 36..48 */
1422         if (freq >= 5180 && freq <= 5240) {
1423                 if (vht_opclass) {
1424                         *op_class = vht_opclass;
1425                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1426                         if (freq > chandef->chan->center_freq)
1427                                 *op_class = 116;
1428                         else
1429                                 *op_class = 117;
1430                 } else {
1431                         *op_class = 115;
1432                 }
1433
1434                 return true;
1435         }
1436
1437         /* 5 GHz, channels 52..64 */
1438         if (freq >= 5260 && freq <= 5320) {
1439                 if (vht_opclass) {
1440                         *op_class = vht_opclass;
1441                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1442                         if (freq > chandef->chan->center_freq)
1443                                 *op_class = 119;
1444                         else
1445                                 *op_class = 120;
1446                 } else {
1447                         *op_class = 118;
1448                 }
1449
1450                 return true;
1451         }
1452
1453         /* 5 GHz, channels 100..144 */
1454         if (freq >= 5500 && freq <= 5720) {
1455                 if (vht_opclass) {
1456                         *op_class = vht_opclass;
1457                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1458                         if (freq > chandef->chan->center_freq)
1459                                 *op_class = 122;
1460                         else
1461                                 *op_class = 123;
1462                 } else {
1463                         *op_class = 121;
1464                 }
1465
1466                 return true;
1467         }
1468
1469         /* 5 GHz, channels 149..169 */
1470         if (freq >= 5745 && freq <= 5845) {
1471                 if (vht_opclass) {
1472                         *op_class = vht_opclass;
1473                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1474                         if (freq > chandef->chan->center_freq)
1475                                 *op_class = 126;
1476                         else
1477                                 *op_class = 127;
1478                 } else if (freq <= 5805) {
1479                         *op_class = 124;
1480                 } else {
1481                         *op_class = 125;
1482                 }
1483
1484                 return true;
1485         }
1486
1487         /* 56.16 GHz, channel 1..4 */
1488         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1489                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1490                         return false;
1491
1492                 *op_class = 180;
1493                 return true;
1494         }
1495
1496         /* not supported yet */
1497         return false;
1498 }
1499 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1500
1501 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1502                                  u32 beacon_int)
1503 {
1504         struct wireless_dev *wdev;
1505         int res = 0;
1506
1507         if (!beacon_int)
1508                 return -EINVAL;
1509
1510         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1511                 if (!wdev->beacon_interval)
1512                         continue;
1513                 if (wdev->beacon_interval != beacon_int) {
1514                         res = -EINVAL;
1515                         break;
1516                 }
1517         }
1518
1519         return res;
1520 }
1521
1522 int cfg80211_iter_combinations(struct wiphy *wiphy,
1523                                const int num_different_channels,
1524                                const u8 radar_detect,
1525                                const int iftype_num[NUM_NL80211_IFTYPES],
1526                                void (*iter)(const struct ieee80211_iface_combination *c,
1527                                             void *data),
1528                                void *data)
1529 {
1530         const struct ieee80211_regdomain *regdom;
1531         enum nl80211_dfs_regions region = 0;
1532         int i, j, iftype;
1533         int num_interfaces = 0;
1534         u32 used_iftypes = 0;
1535
1536         if (radar_detect) {
1537                 rcu_read_lock();
1538                 regdom = rcu_dereference(cfg80211_regdomain);
1539                 if (regdom)
1540                         region = regdom->dfs_region;
1541                 rcu_read_unlock();
1542         }
1543
1544         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1545                 num_interfaces += iftype_num[iftype];
1546                 if (iftype_num[iftype] > 0 &&
1547                     !(wiphy->software_iftypes & BIT(iftype)))
1548                         used_iftypes |= BIT(iftype);
1549         }
1550
1551         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1552                 const struct ieee80211_iface_combination *c;
1553                 struct ieee80211_iface_limit *limits;
1554                 u32 all_iftypes = 0;
1555
1556                 c = &wiphy->iface_combinations[i];
1557
1558                 if (num_interfaces > c->max_interfaces)
1559                         continue;
1560                 if (num_different_channels > c->num_different_channels)
1561                         continue;
1562
1563                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1564                                  GFP_KERNEL);
1565                 if (!limits)
1566                         return -ENOMEM;
1567
1568                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1569                         if (wiphy->software_iftypes & BIT(iftype))
1570                                 continue;
1571                         for (j = 0; j < c->n_limits; j++) {
1572                                 all_iftypes |= limits[j].types;
1573                                 if (!(limits[j].types & BIT(iftype)))
1574                                         continue;
1575                                 if (limits[j].max < iftype_num[iftype])
1576                                         goto cont;
1577                                 limits[j].max -= iftype_num[iftype];
1578                         }
1579                 }
1580
1581                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1582                         goto cont;
1583
1584                 if (radar_detect && c->radar_detect_regions &&
1585                     !(c->radar_detect_regions & BIT(region)))
1586                         goto cont;
1587
1588                 /* Finally check that all iftypes that we're currently
1589                  * using are actually part of this combination. If they
1590                  * aren't then we can't use this combination and have
1591                  * to continue to the next.
1592                  */
1593                 if ((all_iftypes & used_iftypes) != used_iftypes)
1594                         goto cont;
1595
1596                 /* This combination covered all interface types and
1597                  * supported the requested numbers, so we're good.
1598                  */
1599
1600                 (*iter)(c, data);
1601  cont:
1602                 kfree(limits);
1603         }
1604
1605         return 0;
1606 }
1607 EXPORT_SYMBOL(cfg80211_iter_combinations);
1608
1609 static void
1610 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1611                           void *data)
1612 {
1613         int *num = data;
1614         (*num)++;
1615 }
1616
1617 int cfg80211_check_combinations(struct wiphy *wiphy,
1618                                 const int num_different_channels,
1619                                 const u8 radar_detect,
1620                                 const int iftype_num[NUM_NL80211_IFTYPES])
1621 {
1622         int err, num = 0;
1623
1624         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1625                                          radar_detect, iftype_num,
1626                                          cfg80211_iter_sum_ifcombs, &num);
1627         if (err)
1628                 return err;
1629         if (num == 0)
1630                 return -EBUSY;
1631
1632         return 0;
1633 }
1634 EXPORT_SYMBOL(cfg80211_check_combinations);
1635
1636 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1637                                  struct wireless_dev *wdev,
1638                                  enum nl80211_iftype iftype,
1639                                  struct ieee80211_channel *chan,
1640                                  enum cfg80211_chan_mode chanmode,
1641                                  u8 radar_detect)
1642 {
1643         struct wireless_dev *wdev_iter;
1644         int num[NUM_NL80211_IFTYPES];
1645         struct ieee80211_channel
1646                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1647         struct ieee80211_channel *ch;
1648         enum cfg80211_chan_mode chmode;
1649         int num_different_channels = 0;
1650         int total = 1;
1651         int i;
1652
1653         ASSERT_RTNL();
1654
1655         if (WARN_ON(hweight32(radar_detect) > 1))
1656                 return -EINVAL;
1657
1658         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1659                 return -EINVAL;
1660
1661         /* Always allow software iftypes */
1662         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1663                 if (radar_detect)
1664                         return -EINVAL;
1665                 return 0;
1666         }
1667
1668         memset(num, 0, sizeof(num));
1669         memset(used_channels, 0, sizeof(used_channels));
1670
1671         num[iftype] = 1;
1672
1673         /* TODO: We'll probably not need this anymore, since this
1674          * should only be called with CHAN_MODE_UNDEFINED. There are
1675          * still a couple of pending calls where other chanmodes are
1676          * used, but we should get rid of them.
1677          */
1678         switch (chanmode) {
1679         case CHAN_MODE_UNDEFINED:
1680                 break;
1681         case CHAN_MODE_SHARED:
1682                 WARN_ON(!chan);
1683                 used_channels[0] = chan;
1684                 num_different_channels++;
1685                 break;
1686         case CHAN_MODE_EXCLUSIVE:
1687                 num_different_channels++;
1688                 break;
1689         }
1690
1691         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1692                 if (wdev_iter == wdev)
1693                         continue;
1694                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1695                         if (!wdev_iter->p2p_started)
1696                                 continue;
1697                 } else if (wdev_iter->netdev) {
1698                         if (!netif_running(wdev_iter->netdev))
1699                                 continue;
1700                 } else {
1701                         WARN_ON(1);
1702                 }
1703
1704                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1705                         continue;
1706
1707                 /*
1708                  * We may be holding the "wdev" mutex, but now need to lock
1709                  * wdev_iter. This is OK because once we get here wdev_iter
1710                  * is not wdev (tested above), but we need to use the nested
1711                  * locking for lockdep.
1712                  */
1713                 mutex_lock_nested(&wdev_iter->mtx, 1);
1714                 __acquire(wdev_iter->mtx);
1715                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1716                 wdev_unlock(wdev_iter);
1717
1718                 switch (chmode) {
1719                 case CHAN_MODE_UNDEFINED:
1720                         break;
1721                 case CHAN_MODE_SHARED:
1722                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1723                                 if (!used_channels[i] || used_channels[i] == ch)
1724                                         break;
1725
1726                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1727                                 return -EBUSY;
1728
1729                         if (used_channels[i] == NULL) {
1730                                 used_channels[i] = ch;
1731                                 num_different_channels++;
1732                         }
1733                         break;
1734                 case CHAN_MODE_EXCLUSIVE:
1735                         num_different_channels++;
1736                         break;
1737                 }
1738
1739                 num[wdev_iter->iftype]++;
1740                 total++;
1741         }
1742
1743         if (total == 1 && !radar_detect)
1744                 return 0;
1745
1746         return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1747                                            radar_detect, num);
1748 }
1749
1750 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1751                            const u8 *rates, unsigned int n_rates,
1752                            u32 *mask)
1753 {
1754         int i, j;
1755
1756         if (!sband)
1757                 return -EINVAL;
1758
1759         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1760                 return -EINVAL;
1761
1762         *mask = 0;
1763
1764         for (i = 0; i < n_rates; i++) {
1765                 int rate = (rates[i] & 0x7f) * 5;
1766                 bool found = false;
1767
1768                 for (j = 0; j < sband->n_bitrates; j++) {
1769                         if (sband->bitrates[j].bitrate == rate) {
1770                                 found = true;
1771                                 *mask |= BIT(j);
1772                                 break;
1773                         }
1774                 }
1775                 if (!found)
1776                         return -EINVAL;
1777         }
1778
1779         /*
1780          * mask must have at least one bit set here since we
1781          * didn't accept a 0-length rates array nor allowed
1782          * entries in the array that didn't exist
1783          */
1784
1785         return 0;
1786 }
1787
1788 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1789 {
1790         enum ieee80211_band band;
1791         unsigned int n_channels = 0;
1792
1793         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1794                 if (wiphy->bands[band])
1795                         n_channels += wiphy->bands[band]->n_channels;
1796
1797         return n_channels;
1798 }
1799 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1800
1801 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1802                          struct station_info *sinfo)
1803 {
1804         struct cfg80211_registered_device *rdev;
1805         struct wireless_dev *wdev;
1806
1807         wdev = dev->ieee80211_ptr;
1808         if (!wdev)
1809                 return -EOPNOTSUPP;
1810
1811         rdev = wiphy_to_rdev(wdev->wiphy);
1812         if (!rdev->ops->get_station)
1813                 return -EOPNOTSUPP;
1814
1815         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1816 }
1817 EXPORT_SYMBOL(cfg80211_get_station);
1818
1819 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1820 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1821 const unsigned char rfc1042_header[] __aligned(2) =
1822         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1823 EXPORT_SYMBOL(rfc1042_header);
1824
1825 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1826 const unsigned char bridge_tunnel_header[] __aligned(2) =
1827         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1828 EXPORT_SYMBOL(bridge_tunnel_header);
1829
1830 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
1831 struct iapp_layer2_update {
1832         u8 da[ETH_ALEN];        /* broadcast */
1833         u8 sa[ETH_ALEN];        /* STA addr */
1834         __be16 len;             /* 6 */
1835         u8 dsap;                /* 0 */
1836         u8 ssap;                /* 0 */
1837         u8 control;
1838         u8 xid_info[3];
1839 } __packed;
1840
1841 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
1842 {
1843         struct iapp_layer2_update *msg;
1844         struct sk_buff *skb;
1845
1846         /* Send Level 2 Update Frame to update forwarding tables in layer 2
1847          * bridge devices */
1848
1849         skb = dev_alloc_skb(sizeof(*msg));
1850         if (!skb)
1851                 return;
1852         msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));
1853
1854         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
1855          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
1856
1857         eth_broadcast_addr(msg->da);
1858         ether_addr_copy(msg->sa, addr);
1859         msg->len = htons(6);
1860         msg->dsap = 0;
1861         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
1862         msg->control = 0xaf;    /* XID response lsb.1111F101.
1863                                  * F=0 (no poll command; unsolicited frame) */
1864         msg->xid_info[0] = 0x81;        /* XID format identifier */
1865         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
1866         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
1867
1868         skb->dev = dev;
1869         skb->protocol = eth_type_trans(skb, dev);
1870         memset(skb->cb, 0, sizeof(skb->cb));
1871         netif_rx_ni(skb);
1872 }
1873 EXPORT_SYMBOL(cfg80211_send_layer2_update);