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         /*
 231          * Disallow pairwise keys with non-zero index unless it's WEP
 232          * or a vendor specific cipher (because current deployments use
 233          * pairwise WEP keys with non-zero indices and for vendor specific
 234          * ciphers this should be validated in the driver or hardware level
 235          * - but 802.11i clearly specifies to use zero)
 236          */
 237         if (pairwise && key_idx &&
 238             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 239              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 240              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 241                 return -EINVAL;
 242
 243         switch (params->cipher) {
 244         case WLAN_CIPHER_SUITE_WEP40:
 245                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 246                         return -EINVAL;
 247                 break;
 248         case WLAN_CIPHER_SUITE_TKIP:
 249                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 250                         return -EINVAL;
 251                 break;
 252         case WLAN_CIPHER_SUITE_CCMP:
 253                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 254                         return -EINVAL;
 255                 break;
 256         case WLAN_CIPHER_SUITE_WEP104:
 257                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 258                         return -EINVAL;
 259                 break;
 260         case WLAN_CIPHER_SUITE_AES_CMAC:
 261                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 262                         return -EINVAL;
 263                 break;
 264         default:
 265                 /*
 266                  * We don't know anything about this algorithm,
 267                  * allow using it -- but the driver must check
 268                  * all parameters! We still check below whether
 269                  * or not the driver supports this algorithm,
 270                  * of course.
 271                  */
 272                 break;
 273         }
 274
 275         if (params->seq) {
 276                 switch (params->cipher) {
 277                 case WLAN_CIPHER_SUITE_WEP40:
 278                 case WLAN_CIPHER_SUITE_WEP104:
 279                         /* These ciphers do not use key sequence */
 280                         return -EINVAL;
 281                 case WLAN_CIPHER_SUITE_TKIP:
 282                 case WLAN_CIPHER_SUITE_CCMP:
 283                 case WLAN_CIPHER_SUITE_AES_CMAC:
 284                         if (params->seq_len != 6)
 285                                 return -EINVAL;
 286                         break;
 287                 }
 288         }
 289
 290         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 291                 return -EINVAL;
 292
 293         return 0;
 294 }
 295
 296 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 297 {
 298         unsigned int hdrlen = 24;
 299
 300         if (ieee80211_is_data(fc)) {
 301                 if (ieee80211_has_a4(fc))
 302                         hdrlen = 30;
 303                 if (ieee80211_is_data_qos(fc)) {
 304                         hdrlen += IEEE80211_QOS_CTL_LEN;
 305                         if (ieee80211_has_order(fc))
 306                                 hdrlen += IEEE80211_HT_CTL_LEN;
 307                 }
 308                 goto out;
 309         }
 310
 311         if (ieee80211_is_ctl(fc)) {
 312                 /*
 313                  * ACK and CTS are 10 bytes, all others 16. To see how
 314                  * to get this condition consider
 315                  *   subtype mask:   0b0000000011110000 (0x00F0)
 316                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 317                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 318                  *   bits that matter:         ^^^      (0x00E0)
 319                  *   value of those: 0b0000000011000000 (0x00C0)
 320                  */
 321                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 322                         hdrlen = 10;
 323                 else
 324                         hdrlen = 16;
 325         }
 326 out:
 327         return hdrlen;
 328 }
 329 EXPORT_SYMBOL(ieee80211_hdrlen);
 330
 331 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 332 {
 333         const struct ieee80211_hdr *hdr =
 334                         (const struct ieee80211_hdr *)skb->data;
 335         unsigned int hdrlen;
 336
 337         if (unlikely(skb->len < 10))
 338                 return 0;
 339         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 340         if (unlikely(hdrlen > skb->len))
 341                 return 0;
 342         return hdrlen;
 343 }
 344 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 345
 346 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 347 {
 348         int ae = meshhdr->flags & MESH_FLAGS_AE;
 349         /* 802.11-2012, 8.2.4.7.3 */
 350         switch (ae) {
 351         default:
 352         case 0:
 353                 return 6;
 354         case MESH_FLAGS_AE_A4:
 355                 return 12;
 356         case MESH_FLAGS_AE_A5_A6:
 357                 return 18;
 358         }
 359 }
 360 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 361
 362 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 363                            enum nl80211_iftype iftype)
 364 {
 365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 366         u16 hdrlen, ethertype;
 367         u8 *payload;
 368         u8 dst[ETH_ALEN];
 369         u8 src[ETH_ALEN] __aligned(2);
 370
 371         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 372                 return -1;
 373
 374         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 375
 376         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 377          * header
 378          * IEEE 802.11 address fields:
 379          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 380          *   0     0   DA    SA    BSSID n/a
 381          *   0     1   DA    BSSID SA    n/a
 382          *   1     0   BSSID SA    DA    n/a
 383          *   1     1   RA    TA    DA    SA
 384          */
 385         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 386         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 387
 388         switch (hdr->frame_control &
 389                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 390         case cpu_to_le16(IEEE80211_FCTL_TODS):
 391                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 392                              iftype != NL80211_IFTYPE_AP_VLAN &&
 393                              iftype != NL80211_IFTYPE_P2P_GO))
 394                         return -1;
 395                 break;
 396         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 397                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 398                              iftype != NL80211_IFTYPE_MESH_POINT &&
 399                              iftype != NL80211_IFTYPE_AP_VLAN &&
 400                              iftype != NL80211_IFTYPE_STATION))
 401                         return -1;
 402                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 403                         struct ieee80211s_hdr *meshdr =
 404                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 405                         /* make sure meshdr->flags is on the linear part */
 406                         if (!pskb_may_pull(skb, hdrlen + 1))
 407                                 return -1;
 408                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 409                                 return -1;
 410                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 411                                 skb_copy_bits(skb, hdrlen +
 412                                         offsetof(struct ieee80211s_hdr, eaddr1),
 413                                         dst, ETH_ALEN);
 414                                 skb_copy_bits(skb, hdrlen +
 415                                         offsetof(struct ieee80211s_hdr, eaddr2),
 416                                         src, ETH_ALEN);
 417                         }
 418                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 419                 }
 420                 break;
 421         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 422                 if ((iftype != NL80211_IFTYPE_STATION &&
 423                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 424                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 425                     (is_multicast_ether_addr(dst) &&
 426                      ether_addr_equal(src, addr)))
 427                         return -1;
 428                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 429                         struct ieee80211s_hdr *meshdr =
 430                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 431                         /* make sure meshdr->flags is on the linear part */
 432                         if (!pskb_may_pull(skb, hdrlen + 1))
 433                                 return -1;
 434                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 435                                 return -1;
 436                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 437                                 skb_copy_bits(skb, hdrlen +
 438                                         offsetof(struct ieee80211s_hdr, eaddr1),
 439                                         src, ETH_ALEN);
 440                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 441                 }
 442                 break;
 443         case cpu_to_le16(0):
 444                 if (iftype != NL80211_IFTYPE_ADHOC &&
 445                     iftype != NL80211_IFTYPE_STATION &&
 446                     iftype != NL80211_IFTYPE_OCB)
 447                                 return -1;
 448                 break;
 449         }
 450
 451         if (!pskb_may_pull(skb, hdrlen + 8))
 452                 return -1;
 453
 454         payload = skb->data + hdrlen;
 455         ethertype = (payload[6] << 8) | payload[7];
 456
 457         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 458                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 459                    ether_addr_equal(payload, bridge_tunnel_header))) {
 460                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 461                  * replace EtherType */
 462                 skb_pull(skb, hdrlen + 6);
 463                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 464                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 465         } else {
 466                 struct ethhdr *ehdr;
 467                 __be16 len;
 468
 469                 skb_pull(skb, hdrlen);
 470                 len = htons(skb->len);
 471                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 472                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 473                 memcpy(ehdr->h_source, src, ETH_ALEN);
 474                 ehdr->h_proto = len;
 475         }
 476         return 0;
 477 }
 478 EXPORT_SYMBOL(ieee80211_data_to_8023);
 479
 480 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 481                              enum nl80211_iftype iftype,
 482                              const u8 *bssid, bool qos)
 483 {
 484         struct ieee80211_hdr hdr;
 485         u16 hdrlen, ethertype;
 486         __le16 fc;
 487         const u8 *encaps_data;
 488         int encaps_len, skip_header_bytes;
 489         int nh_pos, h_pos;
 490         int head_need;
 491
 492         if (unlikely(skb->len < ETH_HLEN))
 493                 return -EINVAL;
 494
 495         nh_pos = skb_network_header(skb) - skb->data;
 496         h_pos = skb_transport_header(skb) - skb->data;
 497
 498         /* convert Ethernet header to proper 802.11 header (based on
 499          * operation mode) */
 500         ethertype = (skb->data[12] << 8) | skb->data[13];
 501         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 502
 503         switch (iftype) {
 504         case NL80211_IFTYPE_AP:
 505         case NL80211_IFTYPE_AP_VLAN:
 506         case NL80211_IFTYPE_P2P_GO:
 507                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 508                 /* DA BSSID SA */
 509                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 510                 memcpy(hdr.addr2, addr, ETH_ALEN);
 511                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 512                 hdrlen = 24;
 513                 break;
 514         case NL80211_IFTYPE_STATION:
 515         case NL80211_IFTYPE_P2P_CLIENT:
 516                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 517                 /* BSSID SA DA */
 518                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 519                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 520                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 521                 hdrlen = 24;
 522                 break;
 523         case NL80211_IFTYPE_OCB:
 524         case NL80211_IFTYPE_ADHOC:
 525                 /* DA SA BSSID */
 526                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 527                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 528                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 529                 hdrlen = 24;
 530                 break;
 531         default:
 532                 return -EOPNOTSUPP;
 533         }
 534
 535         if (qos) {
 536                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 537                 hdrlen += 2;
 538         }
 539
 540         hdr.frame_control = fc;
 541         hdr.duration_id = 0;
 542         hdr.seq_ctrl = 0;
 543
 544         skip_header_bytes = ETH_HLEN;
 545         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 546                 encaps_data = bridge_tunnel_header;
 547                 encaps_len = sizeof(bridge_tunnel_header);
 548                 skip_header_bytes -= 2;
 549         } else if (ethertype >= ETH_P_802_3_MIN) {
 550                 encaps_data = rfc1042_header;
 551                 encaps_len = sizeof(rfc1042_header);
 552                 skip_header_bytes -= 2;
 553         } else {
 554                 encaps_data = NULL;
 555                 encaps_len = 0;
 556         }
 557
 558         skb_pull(skb, skip_header_bytes);
 559         nh_pos -= skip_header_bytes;
 560         h_pos -= skip_header_bytes;
 561
 562         head_need = hdrlen + encaps_len - skb_headroom(skb);
 563
 564         if (head_need > 0 || skb_cloned(skb)) {
 565                 head_need = max(head_need, 0);
 566                 if (head_need)
 567                         skb_orphan(skb);
 568
 569                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 570                         return -ENOMEM;
 571
 572                 skb->truesize += head_need;
 573         }
 574
 575         if (encaps_data) {
 576                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 577                 nh_pos += encaps_len;
 578                 h_pos += encaps_len;
 579         }
 580
 581         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 582
 583         nh_pos += hdrlen;
 584         h_pos += hdrlen;
 585
 586         /* Update skb pointers to various headers since this modified frame
 587          * is going to go through Linux networking code that may potentially
 588          * need things like pointer to IP header. */
 589         skb_set_mac_header(skb, 0);
 590         skb_set_network_header(skb, nh_pos);
 591         skb_set_transport_header(skb, h_pos);
 592
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(ieee80211_data_from_8023);
 596
 597
 598 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 599                               const u8 *addr, enum nl80211_iftype iftype,
 600                               const unsigned int extra_headroom,
 601                               bool has_80211_header)
 602 {
 603         struct sk_buff *frame = NULL;
 604         u16 ethertype;
 605         u8 *payload;
 606         const struct ethhdr *eth;
 607         int remaining, err;
 608         u8 dst[ETH_ALEN], src[ETH_ALEN];
 609
 610         if (has_80211_header) {
 611                 err = ieee80211_data_to_8023(skb, addr, iftype);
 612                 if (err)
 613                         goto out;
 614
 615                 /* skip the wrapping header */
 616                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 617                 if (!eth)
 618                         goto out;
 619         } else {
 620                 eth = (struct ethhdr *) skb->data;
 621         }
 622
 623         while (skb != frame) {
 624                 u8 padding;
 625                 __be16 len = eth->h_proto;
 626                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 627
 628                 remaining = skb->len;
 629                 memcpy(dst, eth->h_dest, ETH_ALEN);
 630                 memcpy(src, eth->h_source, ETH_ALEN);
 631
 632                 padding = (4 - subframe_len) & 0x3;
 633                 /* the last MSDU has no padding */
 634                 if (subframe_len > remaining)
 635                         goto purge;
 636
 637                 skb_pull(skb, sizeof(struct ethhdr));
 638                 /* reuse skb for the last subframe */
 639                 if (remaining <= subframe_len + padding)
 640                         frame = skb;
 641                 else {
 642                         unsigned int hlen = ALIGN(extra_headroom, 4);
 643                         /*
 644                          * Allocate and reserve two bytes more for payload
 645                          * alignment since sizeof(struct ethhdr) is 14.
 646                          */
 647                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 648                         if (!frame)
 649                                 goto purge;
 650
 651                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 652                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 653                                 ntohs(len));
 654
 655                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 656                                                         padding);
 657                         if (!eth) {
 658                                 dev_kfree_skb(frame);
 659                                 goto purge;
 660                         }
 661                 }
 662
 663                 skb_reset_network_header(frame);
 664                 frame->dev = skb->dev;
 665                 frame->priority = skb->priority;
 666
 667                 payload = frame->data;
 668                 ethertype = (payload[6] << 8) | payload[7];
 669
 670                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 671                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 672                            ether_addr_equal(payload, bridge_tunnel_header))) {
 673                         /* remove RFC1042 or Bridge-Tunnel
 674                          * encapsulation and replace EtherType */
 675                         skb_pull(frame, 6);
 676                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 677                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 678                 } else {
 679                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 680                                 sizeof(__be16));
 681                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 682                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 683                 }
 684                 __skb_queue_tail(list, frame);
 685         }
 686
 687         return;
 688
 689  purge:
 690         __skb_queue_purge(list);
 691  out:
 692         dev_kfree_skb(skb);
 693 }
 694 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 695
 696 /* Given a data frame determine the 802.1p/1d tag to use. */
 697 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 698                                     struct cfg80211_qos_map *qos_map)
 699 {
 700         unsigned int dscp;
 701         unsigned char vlan_priority;
 702
 703         /* skb->priority values from 256->263 are magic values to
 704          * directly indicate a specific 802.1d priority.  This is used
 705          * to allow 802.1d priority to be passed directly in from VLAN
 706          * tags, etc.
 707          */
 708         if (skb->priority >= 256 && skb->priority <= 263)
 709                 return skb->priority - 256;
 710
 711         if (vlan_tx_tag_present(skb)) {
 712                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
 713                         >> VLAN_PRIO_SHIFT;
 714                 if (vlan_priority > 0)
 715                         return vlan_priority;
 716         }
 717
 718         switch (skb->protocol) {
 719         case htons(ETH_P_IP):
 720                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 721                 break;
 722         case htons(ETH_P_IPV6):
 723                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 724                 break;
 725         case htons(ETH_P_MPLS_UC):
 726         case htons(ETH_P_MPLS_MC): {
 727                 struct mpls_label mpls_tmp, *mpls;
 728
 729                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 730                                           sizeof(*mpls), &mpls_tmp);
 731                 if (!mpls)
 732                         return 0;
 733
 734                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 735                         >> MPLS_LS_TC_SHIFT;
 736         }
 737         case htons(ETH_P_80221):
 738                 /* 802.21 is always network control traffic */
 739                 return 7;
 740         default:
 741                 return 0;
 742         }
 743
 744         if (qos_map) {
 745                 unsigned int i, tmp_dscp = dscp >> 2;
 746
 747                 for (i = 0; i < qos_map->num_des; i++) {
 748                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 749                                 return qos_map->dscp_exception[i].up;
 750                 }
 751
 752                 for (i = 0; i < 8; i++) {
 753                         if (tmp_dscp >= qos_map->up[i].low &&
 754                             tmp_dscp <= qos_map->up[i].high)
 755                                 return i;
 756                 }
 757         }
 758
 759         return dscp >> 5;
 760 }
 761 EXPORT_SYMBOL(cfg80211_classify8021d);
 762
 763 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 764 {
 765         const struct cfg80211_bss_ies *ies;
 766
 767         ies = rcu_dereference(bss->ies);
 768         if (!ies)
 769                 return NULL;
 770
 771         return cfg80211_find_ie(ie, ies->data, ies->len);
 772 }
 773 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 774
 775 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 776 {
 777         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 778         struct net_device *dev = wdev->netdev;
 779         int i;
 780
 781         if (!wdev->connect_keys)
 782                 return;
 783
 784         for (i = 0; i < 6; i++) {
 785                 if (!wdev->connect_keys->params[i].cipher)
 786                         continue;
 787                 if (rdev_add_key(rdev, dev, i, false, NULL,
 788                                  &wdev->connect_keys->params[i])) {
 789                         netdev_err(dev, "failed to set key %d\n", i);
 790                         continue;
 791                 }
 792                 if (wdev->connect_keys->def == i)
 793                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 794                                 netdev_err(dev, "failed to set defkey %d\n", i);
 795                                 continue;
 796                         }
 797                 if (wdev->connect_keys->defmgmt == i)
 798                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 799                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 800         }
 801
 802         kzfree(wdev->connect_keys);
 803         wdev->connect_keys = NULL;
 804 }
 805
 806 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 807 {
 808         struct cfg80211_event *ev;
 809         unsigned long flags;
 810         const u8 *bssid = NULL;
 811
 812         spin_lock_irqsave(&wdev->event_lock, flags);
 813         while (!list_empty(&wdev->event_list)) {
 814                 ev = list_first_entry(&wdev->event_list,
 815                                       struct cfg80211_event, list);
 816                 list_del(&ev->list);
 817                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 818
 819                 wdev_lock(wdev);
 820                 switch (ev->type) {
 821                 case EVENT_CONNECT_RESULT:
 822                         if (!is_zero_ether_addr(ev->cr.bssid))
 823                                 bssid = ev->cr.bssid;
 824                         __cfg80211_connect_result(
 825                                 wdev->netdev, bssid,
 826                                 ev->cr.req_ie, ev->cr.req_ie_len,
 827                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 828                                 ev->cr.status,
 829                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 830                                 NULL);
 831                         break;
 832                 case EVENT_ROAMED:
 833                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 834                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 835                                           ev->rm.resp_ie_len);
 836                         break;
 837                 case EVENT_DISCONNECTED:
 838                         __cfg80211_disconnected(wdev->netdev,
 839                                                 ev->dc.ie, ev->dc.ie_len,
 840                                                 ev->dc.reason, true);
 841                         break;
 842                 case EVENT_IBSS_JOINED:
 843                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 844                                                ev->ij.channel);
 845                         break;
 846                 case EVENT_STOPPED:
 847                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 848                         break;
 849                 }
 850                 wdev_unlock(wdev);
 851
 852                 kfree(ev);
 853
 854                 spin_lock_irqsave(&wdev->event_lock, flags);
 855         }
 856         spin_unlock_irqrestore(&wdev->event_lock, flags);
 857 }
 858
 859 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 860 {
 861         struct wireless_dev *wdev;
 862
 863         ASSERT_RTNL();
 864
 865         list_for_each_entry(wdev, &rdev->wdev_list, list)
 866                 cfg80211_process_wdev_events(wdev);
 867 }
 868
 869 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 870                           struct net_device *dev, enum nl80211_iftype ntype,
 871                           u32 *flags, struct vif_params *params)
 872 {
 873         int err;
 874         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 875
 876         ASSERT_RTNL();
 877
 878         /* don't support changing VLANs, you just re-create them */
 879         if (otype == NL80211_IFTYPE_AP_VLAN)
 880                 return -EOPNOTSUPP;
 881
 882         /* cannot change into P2P device type */
 883         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 884                 return -EOPNOTSUPP;
 885
 886         if (!rdev->ops->change_virtual_intf ||
 887             !(rdev->wiphy.interface_modes & (1 << ntype)))
 888                 return -EOPNOTSUPP;
 889
 890         /* if it's part of a bridge, reject changing type to station/ibss */
 891         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 892             (ntype == NL80211_IFTYPE_ADHOC ||
 893              ntype == NL80211_IFTYPE_STATION ||
 894              ntype == NL80211_IFTYPE_P2P_CLIENT))
 895                 return -EBUSY;
 896
 897         if (ntype != otype && netif_running(dev)) {
 898                 dev->ieee80211_ptr->use_4addr = false;
 899                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 900                 wdev_lock(dev->ieee80211_ptr);
 901                 rdev_set_qos_map(rdev, dev, NULL);
 902                 wdev_unlock(dev->ieee80211_ptr);
 903
 904                 switch (otype) {
 905                 case NL80211_IFTYPE_AP:
 906                         cfg80211_stop_ap(rdev, dev, true);
 907                         break;
 908                 case NL80211_IFTYPE_ADHOC:
 909                         cfg80211_leave_ibss(rdev, dev, false);
 910                         break;
 911                 case NL80211_IFTYPE_STATION:
 912                 case NL80211_IFTYPE_P2P_CLIENT:
 913                         wdev_lock(dev->ieee80211_ptr);
 914                         cfg80211_disconnect(rdev, dev,
 915                                             WLAN_REASON_DEAUTH_LEAVING, true);
 916                         wdev_unlock(dev->ieee80211_ptr);
 917                         break;
 918                 case NL80211_IFTYPE_MESH_POINT:
 919                         /* mesh should be handled? */
 920                         break;
 921                 default:
 922                         break;
 923                 }
 924
 925                 cfg80211_process_rdev_events(rdev);
 926         }
 927
 928         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 929
 930         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 931
 932         if (!err && params && params->use_4addr != -1)
 933                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 934
 935         if (!err) {
 936                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 937                 switch (ntype) {
 938                 case NL80211_IFTYPE_STATION:
 939                         if (dev->ieee80211_ptr->use_4addr)
 940                                 break;
 941                         /* fall through */
 942                 case NL80211_IFTYPE_OCB:
 943                 case NL80211_IFTYPE_P2P_CLIENT:
 944                 case NL80211_IFTYPE_ADHOC:
 945                         dev->priv_flags |= IFF_DONT_BRIDGE;
 946                         break;
 947                 case NL80211_IFTYPE_P2P_GO:
 948                 case NL80211_IFTYPE_AP:
 949                 case NL80211_IFTYPE_AP_VLAN:
 950                 case NL80211_IFTYPE_WDS:
 951                 case NL80211_IFTYPE_MESH_POINT:
 952                         /* bridging OK */
 953                         break;
 954                 case NL80211_IFTYPE_MONITOR:
 955                         /* monitor can't bridge anyway */
 956                         break;
 957                 case NL80211_IFTYPE_UNSPECIFIED:
 958                 case NUM_NL80211_IFTYPES:
 959                         /* not happening */
 960                         break;
 961                 case NL80211_IFTYPE_P2P_DEVICE:
 962                         WARN_ON(1);
 963                         break;
 964                 }
 965         }
 966
 967         if (!err && ntype != otype && netif_running(dev)) {
 968                 cfg80211_update_iface_num(rdev, ntype, 1);
 969                 cfg80211_update_iface_num(rdev, otype, -1);
 970         }
 971
 972         return err;
 973 }
 974
 975 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 976 {
 977         static const u32 __mcs2bitrate[] = {
 978                 /* control PHY */
 979                 [0] =   275,
 980                 /* SC PHY */
 981                 [1] =  3850,
 982                 [2] =  7700,
 983                 [3] =  9625,
 984                 [4] = 11550,
 985                 [5] = 12512, /* 1251.25 mbps */
 986                 [6] = 15400,
 987                 [7] = 19250,
 988                 [8] = 23100,
 989                 [9] = 25025,
 990                 [10] = 30800,
 991                 [11] = 38500,
 992                 [12] = 46200,
 993                 /* OFDM PHY */
 994                 [13] =  6930,
 995                 [14] =  8662, /* 866.25 mbps */
 996                 [15] = 13860,
 997                 [16] = 17325,
 998                 [17] = 20790,
 999                 [18] = 27720,
1000                 [19] = 34650,
1001                 [20] = 41580,
1002                 [21] = 45045,
1003                 [22] = 51975,
1004                 [23] = 62370,
1005                 [24] = 67568, /* 6756.75 mbps */
1006                 /* LP-SC PHY */
1007                 [25] =  6260,
1008                 [26] =  8340,
1009                 [27] = 11120,
1010                 [28] = 12510,
1011                 [29] = 16680,
1012                 [30] = 22240,
1013                 [31] = 25030,
1014         };
1015
1016         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1017                 return 0;
1018
1019         return __mcs2bitrate[rate->mcs];
1020 }
1021
1022 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1023 {
1024         static const u32 base[4][10] = {
1025                 {   6500000,
1026                    13000000,
1027                    19500000,
1028                    26000000,
1029                    39000000,
1030                    52000000,
1031                    58500000,
1032                    65000000,
1033                    78000000,
1034                    0,
1035                 },
1036                 {  13500000,
1037                    27000000,
1038                    40500000,
1039                    54000000,
1040                    81000000,
1041                   108000000,
1042                   121500000,
1043                   135000000,
1044                   162000000,
1045                   180000000,
1046                 },
1047                 {  29300000,
1048                    58500000,
1049                    87800000,
1050                   117000000,
1051                   175500000,
1052                   234000000,
1053                   263300000,
1054                   292500000,
1055                   351000000,
1056                   390000000,
1057                 },
1058                 {  58500000,
1059                   117000000,
1060                   175500000,
1061                   234000000,
1062                   351000000,
1063                   468000000,
1064                   526500000,
1065                   585000000,
1066                   702000000,
1067                   780000000,
1068                 },
1069         };
1070         u32 bitrate;
1071         int idx;
1072
1073         if (WARN_ON_ONCE(rate->mcs > 9))
1074                 return 0;
1075
1076         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1077                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1078                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1079                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1080
1081         bitrate = base[idx][rate->mcs];
1082         bitrate *= rate->nss;
1083
1084         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1085                 bitrate = (bitrate / 9) * 10;
1086
1087         /* do NOT round down here */
1088         return (bitrate + 50000) / 100000;
1089 }
1090
1091 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1092 {
1093         int modulation, streams, bitrate;
1094
1095         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1096             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1097                 return rate->legacy;
1098         if (rate->flags & RATE_INFO_FLAGS_60G)
1099                 return cfg80211_calculate_bitrate_60g(rate);
1100         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1101                 return cfg80211_calculate_bitrate_vht(rate);
1102
1103         /* the formula below does only work for MCS values smaller than 32 */
1104         if (WARN_ON_ONCE(rate->mcs >= 32))
1105                 return 0;
1106
1107         modulation = rate->mcs & 7;
1108         streams = (rate->mcs >> 3) + 1;
1109
1110         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1111                         13500000 : 6500000;
1112
1113         if (modulation < 4)
1114                 bitrate *= (modulation + 1);
1115         else if (modulation == 4)
1116                 bitrate *= (modulation + 2);
1117         else
1118                 bitrate *= (modulation + 3);
1119
1120         bitrate *= streams;
1121
1122         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1123                 bitrate = (bitrate / 9) * 10;
1124
1125         /* do NOT round down here */
1126         return (bitrate + 50000) / 100000;
1127 }
1128 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1129
1130 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1131                           enum ieee80211_p2p_attr_id attr,
1132                           u8 *buf, unsigned int bufsize)
1133 {
1134         u8 *out = buf;
1135         u16 attr_remaining = 0;
1136         bool desired_attr = false;
1137         u16 desired_len = 0;
1138
1139         while (len > 0) {
1140                 unsigned int iedatalen;
1141                 unsigned int copy;
1142                 const u8 *iedata;
1143
1144                 if (len < 2)
1145                         return -EILSEQ;
1146                 iedatalen = ies[1];
1147                 if (iedatalen + 2 > len)
1148                         return -EILSEQ;
1149
1150                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1151                         goto cont;
1152
1153                 if (iedatalen < 4)
1154                         goto cont;
1155
1156                 iedata = ies + 2;
1157
1158                 /* check WFA OUI, P2P subtype */
1159                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1160                     iedata[2] != 0x9a || iedata[3] != 0x09)
1161                         goto cont;
1162
1163                 iedatalen -= 4;
1164                 iedata += 4;
1165
1166                 /* check attribute continuation into this IE */
1167                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1168                 if (copy && desired_attr) {
1169                         desired_len += copy;
1170                         if (out) {
1171                                 memcpy(out, iedata, min(bufsize, copy));
1172                                 out += min(bufsize, copy);
1173                                 bufsize -= min(bufsize, copy);
1174                         }
1175
1176
1177                         if (copy == attr_remaining)
1178                                 return desired_len;
1179                 }
1180
1181                 attr_remaining -= copy;
1182                 if (attr_remaining)
1183                         goto cont;
1184
1185                 iedatalen -= copy;
1186                 iedata += copy;
1187
1188                 while (iedatalen > 0) {
1189                         u16 attr_len;
1190
1191                         /* P2P attribute ID & size must fit */
1192                         if (iedatalen < 3)
1193                                 return -EILSEQ;
1194                         desired_attr = iedata[0] == attr;
1195                         attr_len = get_unaligned_le16(iedata + 1);
1196                         iedatalen -= 3;
1197                         iedata += 3;
1198
1199                         copy = min_t(unsigned int, attr_len, iedatalen);
1200
1201                         if (desired_attr) {
1202                                 desired_len += copy;
1203                                 if (out) {
1204                                         memcpy(out, iedata, min(bufsize, copy));
1205                                         out += min(bufsize, copy);
1206                                         bufsize -= min(bufsize, copy);
1207                                 }
1208
1209                                 if (copy == attr_len)
1210                                         return desired_len;
1211                         }
1212
1213                         iedata += copy;
1214                         iedatalen -= copy;
1215                         attr_remaining = attr_len - copy;
1216                 }
1217
1218  cont:
1219                 len -= ies[1] + 2;
1220                 ies += ies[1] + 2;
1221         }
1222
1223         if (attr_remaining && desired_attr)
1224                 return -EILSEQ;
1225
1226         return -ENOENT;
1227 }
1228 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1229
1230 bool ieee80211_operating_class_to_band(u8 operating_class,
1231                                        enum ieee80211_band *band)
1232 {
1233         switch (operating_class) {
1234         case 112:
1235         case 115 ... 127:
1236                 *band = IEEE80211_BAND_5GHZ;
1237                 return true;
1238         case 81:
1239         case 82:
1240         case 83:
1241         case 84:
1242                 *band = IEEE80211_BAND_2GHZ;
1243                 return true;
1244         case 180:
1245                 *band = IEEE80211_BAND_60GHZ;
1246                 return true;
1247         }
1248
1249         return false;
1250 }
1251 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1252
1253 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1254                                  u32 beacon_int)
1255 {
1256         struct wireless_dev *wdev;
1257         int res = 0;
1258
1259         if (!beacon_int)
1260                 return -EINVAL;
1261
1262         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1263                 if (!wdev->beacon_interval)
1264                         continue;
1265                 if (wdev->beacon_interval != beacon_int) {
1266                         res = -EINVAL;
1267                         break;
1268                 }
1269         }
1270
1271         return res;
1272 }
1273
1274 int cfg80211_iter_combinations(struct wiphy *wiphy,
1275                                const int num_different_channels,
1276                                const u8 radar_detect,
1277                                const int iftype_num[NUM_NL80211_IFTYPES],
1278                                void (*iter)(const struct ieee80211_iface_combination *c,
1279                                             void *data),
1280                                void *data)
1281 {
1282         const struct ieee80211_regdomain *regdom;
1283         enum nl80211_dfs_regions region = 0;
1284         int i, j, iftype;
1285         int num_interfaces = 0;
1286         u32 used_iftypes = 0;
1287
1288         if (radar_detect) {
1289                 rcu_read_lock();
1290                 regdom = rcu_dereference(cfg80211_regdomain);
1291                 if (regdom)
1292                         region = regdom->dfs_region;
1293                 rcu_read_unlock();
1294         }
1295
1296         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1297                 num_interfaces += iftype_num[iftype];
1298                 if (iftype_num[iftype] > 0 &&
1299                     !(wiphy->software_iftypes & BIT(iftype)))
1300                         used_iftypes |= BIT(iftype);
1301         }
1302
1303         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1304                 const struct ieee80211_iface_combination *c;
1305                 struct ieee80211_iface_limit *limits;
1306                 u32 all_iftypes = 0;
1307
1308                 c = &wiphy->iface_combinations[i];
1309
1310                 if (num_interfaces > c->max_interfaces)
1311                         continue;
1312                 if (num_different_channels > c->num_different_channels)
1313                         continue;
1314
1315                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1316                                  GFP_KERNEL);
1317                 if (!limits)
1318                         return -ENOMEM;
1319
1320                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1321                         if (wiphy->software_iftypes & BIT(iftype))
1322                                 continue;
1323                         for (j = 0; j < c->n_limits; j++) {
1324                                 all_iftypes |= limits[j].types;
1325                                 if (!(limits[j].types & BIT(iftype)))
1326                                         continue;
1327                                 if (limits[j].max < iftype_num[iftype])
1328                                         goto cont;
1329                                 limits[j].max -= iftype_num[iftype];
1330                         }
1331                 }
1332
1333                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1334                         goto cont;
1335
1336                 if (radar_detect && c->radar_detect_regions &&
1337                     !(c->radar_detect_regions & BIT(region)))
1338                         goto cont;
1339
1340                 /* Finally check that all iftypes that we're currently
1341                  * using are actually part of this combination. If they
1342                  * aren't then we can't use this combination and have
1343                  * to continue to the next.
1344                  */
1345                 if ((all_iftypes & used_iftypes) != used_iftypes)
1346                         goto cont;
1347
1348                 /* This combination covered all interface types and
1349                  * supported the requested numbers, so we're good.
1350                  */
1351
1352                 (*iter)(c, data);
1353  cont:
1354                 kfree(limits);
1355         }
1356
1357         return 0;
1358 }
1359 EXPORT_SYMBOL(cfg80211_iter_combinations);
1360
1361 static void
1362 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1363                           void *data)
1364 {
1365         int *num = data;
1366         (*num)++;
1367 }
1368
1369 int cfg80211_check_combinations(struct wiphy *wiphy,
1370                                 const int num_different_channels,
1371                                 const u8 radar_detect,
1372                                 const int iftype_num[NUM_NL80211_IFTYPES])
1373 {
1374         int err, num = 0;
1375
1376         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1377                                          radar_detect, iftype_num,
1378                                          cfg80211_iter_sum_ifcombs, &num);
1379         if (err)
1380                 return err;
1381         if (num == 0)
1382                 return -EBUSY;
1383
1384         return 0;
1385 }
1386 EXPORT_SYMBOL(cfg80211_check_combinations);
1387
1388 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1389                                  struct wireless_dev *wdev,
1390                                  enum nl80211_iftype iftype,
1391                                  struct ieee80211_channel *chan,
1392                                  enum cfg80211_chan_mode chanmode,
1393                                  u8 radar_detect)
1394 {
1395         struct wireless_dev *wdev_iter;
1396         int num[NUM_NL80211_IFTYPES];
1397         struct ieee80211_channel
1398                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1399         struct ieee80211_channel *ch;
1400         enum cfg80211_chan_mode chmode;
1401         int num_different_channels = 0;
1402         int total = 1;
1403         int i;
1404
1405         ASSERT_RTNL();
1406
1407         if (WARN_ON(hweight32(radar_detect) > 1))
1408                 return -EINVAL;
1409
1410         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1411                 return -EINVAL;
1412
1413         /* Always allow software iftypes */
1414         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1415                 if (radar_detect)
1416                         return -EINVAL;
1417                 return 0;
1418         }
1419
1420         memset(num, 0, sizeof(num));
1421         memset(used_channels, 0, sizeof(used_channels));
1422
1423         num[iftype] = 1;
1424
1425         /* TODO: We'll probably not need this anymore, since this
1426          * should only be called with CHAN_MODE_UNDEFINED. There are
1427          * still a couple of pending calls where other chanmodes are
1428          * used, but we should get rid of them.
1429          */
1430         switch (chanmode) {
1431         case CHAN_MODE_UNDEFINED:
1432                 break;
1433         case CHAN_MODE_SHARED:
1434                 WARN_ON(!chan);
1435                 used_channels[0] = chan;
1436                 num_different_channels++;
1437                 break;
1438         case CHAN_MODE_EXCLUSIVE:
1439                 num_different_channels++;
1440                 break;
1441         }
1442
1443         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1444                 if (wdev_iter == wdev)
1445                         continue;
1446                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1447                         if (!wdev_iter->p2p_started)
1448                                 continue;
1449                 } else if (wdev_iter->netdev) {
1450                         if (!netif_running(wdev_iter->netdev))
1451                                 continue;
1452                 } else {
1453                         WARN_ON(1);
1454                 }
1455
1456                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1457                         continue;
1458
1459                 /*
1460                  * We may be holding the "wdev" mutex, but now need to lock
1461                  * wdev_iter. This is OK because once we get here wdev_iter
1462                  * is not wdev (tested above), but we need to use the nested
1463                  * locking for lockdep.
1464                  */
1465                 mutex_lock_nested(&wdev_iter->mtx, 1);
1466                 __acquire(wdev_iter->mtx);
1467                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1468                 wdev_unlock(wdev_iter);
1469
1470                 switch (chmode) {
1471                 case CHAN_MODE_UNDEFINED:
1472                         break;
1473                 case CHAN_MODE_SHARED:
1474                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1475                                 if (!used_channels[i] || used_channels[i] == ch)
1476                                         break;
1477
1478                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1479                                 return -EBUSY;
1480
1481                         if (used_channels[i] == NULL) {
1482                                 used_channels[i] = ch;
1483                                 num_different_channels++;
1484                         }
1485                         break;
1486                 case CHAN_MODE_EXCLUSIVE:
1487                         num_different_channels++;
1488                         break;
1489                 }
1490
1491                 num[wdev_iter->iftype]++;
1492                 total++;
1493         }
1494
1495         if (total == 1 && !radar_detect)
1496                 return 0;
1497
1498         return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1499                                            radar_detect, num);
1500 }
1501
1502 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1503                            const u8 *rates, unsigned int n_rates,
1504                            u32 *mask)
1505 {
1506         int i, j;
1507
1508         if (!sband)
1509                 return -EINVAL;
1510
1511         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1512                 return -EINVAL;
1513
1514         *mask = 0;
1515
1516         for (i = 0; i < n_rates; i++) {
1517                 int rate = (rates[i] & 0x7f) * 5;
1518                 bool found = false;
1519
1520                 for (j = 0; j < sband->n_bitrates; j++) {
1521                         if (sband->bitrates[j].bitrate == rate) {
1522                                 found = true;
1523                                 *mask |= BIT(j);
1524                                 break;
1525                         }
1526                 }
1527                 if (!found)
1528                         return -EINVAL;
1529         }
1530
1531         /*
1532          * mask must have at least one bit set here since we
1533          * didn't accept a 0-length rates array nor allowed
1534          * entries in the array that didn't exist
1535          */
1536
1537         return 0;
1538 }
1539
1540 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1541 {
1542         enum ieee80211_band band;
1543         unsigned int n_channels = 0;
1544
1545         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1546                 if (wiphy->bands[band])
1547                         n_channels += wiphy->bands[band]->n_channels;
1548
1549         return n_channels;
1550 }
1551 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1552
1553 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1554                          struct station_info *sinfo)
1555 {
1556         struct cfg80211_registered_device *rdev;
1557         struct wireless_dev *wdev;
1558
1559         wdev = dev->ieee80211_ptr;
1560         if (!wdev)
1561                 return -EOPNOTSUPP;
1562
1563         rdev = wiphy_to_rdev(wdev->wiphy);
1564         if (!rdev->ops->get_station)
1565                 return -EOPNOTSUPP;
1566
1567         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1568 }
1569 EXPORT_SYMBOL(cfg80211_get_station);
1570
1571 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1572 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1573 const unsigned char rfc1042_header[] __aligned(2) =
1574         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1575 EXPORT_SYMBOL(rfc1042_header);
1576
1577 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1578 const unsigned char bridge_tunnel_header[] __aligned(2) =
1579         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1580 EXPORT_SYMBOL(bridge_tunnel_header);