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_mgmt(fc)) {
 312                 if (ieee80211_has_order(fc))
 313                         hdrlen += IEEE80211_HT_CTL_LEN;
 314                 goto out;
 315         }
 316
 317         if (ieee80211_is_ctl(fc)) {
 318                 /*
 319                  * ACK and CTS are 10 bytes, all others 16. To see how
 320                  * to get this condition consider
 321                  *   subtype mask:   0b0000000011110000 (0x00F0)
 322                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 323                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 324                  *   bits that matter:         ^^^      (0x00E0)
 325                  *   value of those: 0b0000000011000000 (0x00C0)
 326                  */
 327                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 328                         hdrlen = 10;
 329                 else
 330                         hdrlen = 16;
 331         }
 332 out:
 333         return hdrlen;
 334 }
 335 EXPORT_SYMBOL(ieee80211_hdrlen);
 336
 337 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 338 {
 339         const struct ieee80211_hdr *hdr =
 340                         (const struct ieee80211_hdr *)skb->data;
 341         unsigned int hdrlen;
 342
 343         if (unlikely(skb->len < 10))
 344                 return 0;
 345         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 346         if (unlikely(hdrlen > skb->len))
 347                 return 0;
 348         return hdrlen;
 349 }
 350 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 351
 352 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 353 {
 354         int ae = meshhdr->flags & MESH_FLAGS_AE;
 355         /* 802.11-2012, 8.2.4.7.3 */
 356         switch (ae) {
 357         default:
 358         case 0:
 359                 return 6;
 360         case MESH_FLAGS_AE_A4:
 361                 return 12;
 362         case MESH_FLAGS_AE_A5_A6:
 363                 return 18;
 364         }
 365 }
 366 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 367
 368 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 369                            enum nl80211_iftype iftype)
 370 {
 371         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 372         u16 hdrlen, ethertype;
 373         u8 *payload;
 374         u8 dst[ETH_ALEN];
 375         u8 src[ETH_ALEN] __aligned(2);
 376
 377         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 378                 return -1;
 379
 380         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 381
 382         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 383          * header
 384          * IEEE 802.11 address fields:
 385          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 386          *   0     0   DA    SA    BSSID n/a
 387          *   0     1   DA    BSSID SA    n/a
 388          *   1     0   BSSID SA    DA    n/a
 389          *   1     1   RA    TA    DA    SA
 390          */
 391         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 392         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 393
 394         switch (hdr->frame_control &
 395                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 396         case cpu_to_le16(IEEE80211_FCTL_TODS):
 397                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 398                              iftype != NL80211_IFTYPE_AP_VLAN &&
 399                              iftype != NL80211_IFTYPE_P2P_GO))
 400                         return -1;
 401                 break;
 402         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 403                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 404                              iftype != NL80211_IFTYPE_MESH_POINT &&
 405                              iftype != NL80211_IFTYPE_AP_VLAN &&
 406                              iftype != NL80211_IFTYPE_STATION))
 407                         return -1;
 408                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 409                         struct ieee80211s_hdr *meshdr =
 410                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 411                         /* make sure meshdr->flags is on the linear part */
 412                         if (!pskb_may_pull(skb, hdrlen + 1))
 413                                 return -1;
 414                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 415                                 return -1;
 416                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 417                                 skb_copy_bits(skb, hdrlen +
 418                                         offsetof(struct ieee80211s_hdr, eaddr1),
 419                                         dst, ETH_ALEN);
 420                                 skb_copy_bits(skb, hdrlen +
 421                                         offsetof(struct ieee80211s_hdr, eaddr2),
 422                                         src, ETH_ALEN);
 423                         }
 424                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 425                 }
 426                 break;
 427         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 428                 if ((iftype != NL80211_IFTYPE_STATION &&
 429                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 430                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 431                     (is_multicast_ether_addr(dst) &&
 432                      ether_addr_equal(src, addr)))
 433                         return -1;
 434                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 435                         struct ieee80211s_hdr *meshdr =
 436                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 437                         /* make sure meshdr->flags is on the linear part */
 438                         if (!pskb_may_pull(skb, hdrlen + 1))
 439                                 return -1;
 440                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 441                                 return -1;
 442                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 443                                 skb_copy_bits(skb, hdrlen +
 444                                         offsetof(struct ieee80211s_hdr, eaddr1),
 445                                         src, ETH_ALEN);
 446                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 447                 }
 448                 break;
 449         case cpu_to_le16(0):
 450                 if (iftype != NL80211_IFTYPE_ADHOC &&
 451                     iftype != NL80211_IFTYPE_STATION &&
 452                     iftype != NL80211_IFTYPE_OCB)
 453                                 return -1;
 454                 break;
 455         }
 456
 457         if (!pskb_may_pull(skb, hdrlen + 8))
 458                 return -1;
 459
 460         payload = skb->data + hdrlen;
 461         ethertype = (payload[6] << 8) | payload[7];
 462
 463         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 464                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 465                    ether_addr_equal(payload, bridge_tunnel_header))) {
 466                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 467                  * replace EtherType */
 468                 skb_pull(skb, hdrlen + 6);
 469                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 470                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 471         } else {
 472                 struct ethhdr *ehdr;
 473                 __be16 len;
 474
 475                 skb_pull(skb, hdrlen);
 476                 len = htons(skb->len);
 477                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 478                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 479                 memcpy(ehdr->h_source, src, ETH_ALEN);
 480                 ehdr->h_proto = len;
 481         }
 482         return 0;
 483 }
 484 EXPORT_SYMBOL(ieee80211_data_to_8023);
 485
 486 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 487                              enum nl80211_iftype iftype,
 488                              const u8 *bssid, bool qos)
 489 {
 490         struct ieee80211_hdr hdr;
 491         u16 hdrlen, ethertype;
 492         __le16 fc;
 493         const u8 *encaps_data;
 494         int encaps_len, skip_header_bytes;
 495         int nh_pos, h_pos;
 496         int head_need;
 497
 498         if (unlikely(skb->len < ETH_HLEN))
 499                 return -EINVAL;
 500
 501         nh_pos = skb_network_header(skb) - skb->data;
 502         h_pos = skb_transport_header(skb) - skb->data;
 503
 504         /* convert Ethernet header to proper 802.11 header (based on
 505          * operation mode) */
 506         ethertype = (skb->data[12] << 8) | skb->data[13];
 507         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 508
 509         switch (iftype) {
 510         case NL80211_IFTYPE_AP:
 511         case NL80211_IFTYPE_AP_VLAN:
 512         case NL80211_IFTYPE_P2P_GO:
 513                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 514                 /* DA BSSID SA */
 515                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 516                 memcpy(hdr.addr2, addr, ETH_ALEN);
 517                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 518                 hdrlen = 24;
 519                 break;
 520         case NL80211_IFTYPE_STATION:
 521         case NL80211_IFTYPE_P2P_CLIENT:
 522                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 523                 /* BSSID SA DA */
 524                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 525                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 526                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 527                 hdrlen = 24;
 528                 break;
 529         case NL80211_IFTYPE_OCB:
 530         case NL80211_IFTYPE_ADHOC:
 531                 /* DA SA BSSID */
 532                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 533                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 534                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 535                 hdrlen = 24;
 536                 break;
 537         default:
 538                 return -EOPNOTSUPP;
 539         }
 540
 541         if (qos) {
 542                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 543                 hdrlen += 2;
 544         }
 545
 546         hdr.frame_control = fc;
 547         hdr.duration_id = 0;
 548         hdr.seq_ctrl = 0;
 549
 550         skip_header_bytes = ETH_HLEN;
 551         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 552                 encaps_data = bridge_tunnel_header;
 553                 encaps_len = sizeof(bridge_tunnel_header);
 554                 skip_header_bytes -= 2;
 555         } else if (ethertype >= ETH_P_802_3_MIN) {
 556                 encaps_data = rfc1042_header;
 557                 encaps_len = sizeof(rfc1042_header);
 558                 skip_header_bytes -= 2;
 559         } else {
 560                 encaps_data = NULL;
 561                 encaps_len = 0;
 562         }
 563
 564         skb_pull(skb, skip_header_bytes);
 565         nh_pos -= skip_header_bytes;
 566         h_pos -= skip_header_bytes;
 567
 568         head_need = hdrlen + encaps_len - skb_headroom(skb);
 569
 570         if (head_need > 0 || skb_cloned(skb)) {
 571                 head_need = max(head_need, 0);
 572                 if (head_need)
 573                         skb_orphan(skb);
 574
 575                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 576                         return -ENOMEM;
 577
 578                 skb->truesize += head_need;
 579         }
 580
 581         if (encaps_data) {
 582                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 583                 nh_pos += encaps_len;
 584                 h_pos += encaps_len;
 585         }
 586
 587         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 588
 589         nh_pos += hdrlen;
 590         h_pos += hdrlen;
 591
 592         /* Update skb pointers to various headers since this modified frame
 593          * is going to go through Linux networking code that may potentially
 594          * need things like pointer to IP header. */
 595         skb_set_mac_header(skb, 0);
 596         skb_set_network_header(skb, nh_pos);
 597         skb_set_transport_header(skb, h_pos);
 598
 599         return 0;
 600 }
 601 EXPORT_SYMBOL(ieee80211_data_from_8023);
 602
 603
 604 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 605                               const u8 *addr, enum nl80211_iftype iftype,
 606                               const unsigned int extra_headroom,
 607                               bool has_80211_header)
 608 {
 609         struct sk_buff *frame = NULL;
 610         u16 ethertype;
 611         u8 *payload;
 612         const struct ethhdr *eth;
 613         int remaining, err;
 614         u8 dst[ETH_ALEN], src[ETH_ALEN];
 615
 616         if (has_80211_header) {
 617                 err = ieee80211_data_to_8023(skb, addr, iftype);
 618                 if (err)
 619                         goto out;
 620
 621                 /* skip the wrapping header */
 622                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 623                 if (!eth)
 624                         goto out;
 625         } else {
 626                 eth = (struct ethhdr *) skb->data;
 627         }
 628
 629         while (skb != frame) {
 630                 u8 padding;
 631                 __be16 len = eth->h_proto;
 632                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 633
 634                 remaining = skb->len;
 635                 memcpy(dst, eth->h_dest, ETH_ALEN);
 636                 memcpy(src, eth->h_source, ETH_ALEN);
 637
 638                 padding = (4 - subframe_len) & 0x3;
 639                 /* the last MSDU has no padding */
 640                 if (subframe_len > remaining)
 641                         goto purge;
 642
 643                 skb_pull(skb, sizeof(struct ethhdr));
 644                 /* reuse skb for the last subframe */
 645                 if (remaining <= subframe_len + padding)
 646                         frame = skb;
 647                 else {
 648                         unsigned int hlen = ALIGN(extra_headroom, 4);
 649                         /*
 650                          * Allocate and reserve two bytes more for payload
 651                          * alignment since sizeof(struct ethhdr) is 14.
 652                          */
 653                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 654                         if (!frame)
 655                                 goto purge;
 656
 657                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 658                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 659                                 ntohs(len));
 660
 661                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 662                                                         padding);
 663                         if (!eth) {
 664                                 dev_kfree_skb(frame);
 665                                 goto purge;
 666                         }
 667                 }
 668
 669                 skb_reset_network_header(frame);
 670                 frame->dev = skb->dev;
 671                 frame->priority = skb->priority;
 672
 673                 payload = frame->data;
 674                 ethertype = (payload[6] << 8) | payload[7];
 675
 676                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 677                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 678                            ether_addr_equal(payload, bridge_tunnel_header))) {
 679                         /* remove RFC1042 or Bridge-Tunnel
 680                          * encapsulation and replace EtherType */
 681                         skb_pull(frame, 6);
 682                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 683                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 684                 } else {
 685                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 686                                 sizeof(__be16));
 687                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 688                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 689                 }
 690                 __skb_queue_tail(list, frame);
 691         }
 692
 693         return;
 694
 695  purge:
 696         __skb_queue_purge(list);
 697  out:
 698         dev_kfree_skb(skb);
 699 }
 700 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 701
 702 /* Given a data frame determine the 802.1p/1d tag to use. */
 703 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 704                                     struct cfg80211_qos_map *qos_map)
 705 {
 706         unsigned int dscp;
 707         unsigned char vlan_priority;
 708
 709         /* skb->priority values from 256->263 are magic values to
 710          * directly indicate a specific 802.1d priority.  This is used
 711          * to allow 802.1d priority to be passed directly in from VLAN
 712          * tags, etc.
 713          */
 714         if (skb->priority >= 256 && skb->priority <= 263)
 715                 return skb->priority - 256;
 716
 717         if (vlan_tx_tag_present(skb)) {
 718                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
 719                         >> VLAN_PRIO_SHIFT;
 720                 if (vlan_priority > 0)
 721                         return vlan_priority;
 722         }
 723
 724         switch (skb->protocol) {
 725         case htons(ETH_P_IP):
 726                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 727                 break;
 728         case htons(ETH_P_IPV6):
 729                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 730                 break;
 731         case htons(ETH_P_MPLS_UC):
 732         case htons(ETH_P_MPLS_MC): {
 733                 struct mpls_label mpls_tmp, *mpls;
 734
 735                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 736                                           sizeof(*mpls), &mpls_tmp);
 737                 if (!mpls)
 738                         return 0;
 739
 740                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 741                         >> MPLS_LS_TC_SHIFT;
 742         }
 743         case htons(ETH_P_80221):
 744                 /* 802.21 is always network control traffic */
 745                 return 7;
 746         default:
 747                 return 0;
 748         }
 749
 750         if (qos_map) {
 751                 unsigned int i, tmp_dscp = dscp >> 2;
 752
 753                 for (i = 0; i < qos_map->num_des; i++) {
 754                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 755                                 return qos_map->dscp_exception[i].up;
 756                 }
 757
 758                 for (i = 0; i < 8; i++) {
 759                         if (tmp_dscp >= qos_map->up[i].low &&
 760                             tmp_dscp <= qos_map->up[i].high)
 761                                 return i;
 762                 }
 763         }
 764
 765         return dscp >> 5;
 766 }
 767 EXPORT_SYMBOL(cfg80211_classify8021d);
 768
 769 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 770 {
 771         const struct cfg80211_bss_ies *ies;
 772
 773         ies = rcu_dereference(bss->ies);
 774         if (!ies)
 775                 return NULL;
 776
 777         return cfg80211_find_ie(ie, ies->data, ies->len);
 778 }
 779 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 780
 781 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 782 {
 783         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 784         struct net_device *dev = wdev->netdev;
 785         int i;
 786
 787         if (!wdev->connect_keys)
 788                 return;
 789
 790         for (i = 0; i < 6; i++) {
 791                 if (!wdev->connect_keys->params[i].cipher)
 792                         continue;
 793                 if (rdev_add_key(rdev, dev, i, false, NULL,
 794                                  &wdev->connect_keys->params[i])) {
 795                         netdev_err(dev, "failed to set key %d\n", i);
 796                         continue;
 797                 }
 798                 if (wdev->connect_keys->def == i)
 799                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 800                                 netdev_err(dev, "failed to set defkey %d\n", i);
 801                                 continue;
 802                         }
 803                 if (wdev->connect_keys->defmgmt == i)
 804                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 805                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 806         }
 807
 808         kzfree(wdev->connect_keys);
 809         wdev->connect_keys = NULL;
 810 }
 811
 812 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 813 {
 814         struct cfg80211_event *ev;
 815         unsigned long flags;
 816         const u8 *bssid = NULL;
 817
 818         spin_lock_irqsave(&wdev->event_lock, flags);
 819         while (!list_empty(&wdev->event_list)) {
 820                 ev = list_first_entry(&wdev->event_list,
 821                                       struct cfg80211_event, list);
 822                 list_del(&ev->list);
 823                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 824
 825                 wdev_lock(wdev);
 826                 switch (ev->type) {
 827                 case EVENT_CONNECT_RESULT:
 828                         if (!is_zero_ether_addr(ev->cr.bssid))
 829                                 bssid = ev->cr.bssid;
 830                         __cfg80211_connect_result(
 831                                 wdev->netdev, bssid,
 832                                 ev->cr.req_ie, ev->cr.req_ie_len,
 833                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 834                                 ev->cr.status,
 835                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 836                                 NULL);
 837                         break;
 838                 case EVENT_ROAMED:
 839                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 840                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 841                                           ev->rm.resp_ie_len);
 842                         break;
 843                 case EVENT_DISCONNECTED:
 844                         __cfg80211_disconnected(wdev->netdev,
 845                                                 ev->dc.ie, ev->dc.ie_len,
 846                                                 ev->dc.reason, true);
 847                         break;
 848                 case EVENT_IBSS_JOINED:
 849                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 850                                                ev->ij.channel);
 851                         break;
 852                 case EVENT_STOPPED:
 853                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 854                         break;
 855                 }
 856                 wdev_unlock(wdev);
 857
 858                 kfree(ev);
 859
 860                 spin_lock_irqsave(&wdev->event_lock, flags);
 861         }
 862         spin_unlock_irqrestore(&wdev->event_lock, flags);
 863 }
 864
 865 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 866 {
 867         struct wireless_dev *wdev;
 868
 869         ASSERT_RTNL();
 870
 871         list_for_each_entry(wdev, &rdev->wdev_list, list)
 872                 cfg80211_process_wdev_events(wdev);
 873 }
 874
 875 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 876                           struct net_device *dev, enum nl80211_iftype ntype,
 877                           u32 *flags, struct vif_params *params)
 878 {
 879         int err;
 880         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 881
 882         ASSERT_RTNL();
 883
 884         /* don't support changing VLANs, you just re-create them */
 885         if (otype == NL80211_IFTYPE_AP_VLAN)
 886                 return -EOPNOTSUPP;
 887
 888         /* cannot change into P2P device type */
 889         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 890                 return -EOPNOTSUPP;
 891
 892         if (!rdev->ops->change_virtual_intf ||
 893             !(rdev->wiphy.interface_modes & (1 << ntype)))
 894                 return -EOPNOTSUPP;
 895
 896         /* if it's part of a bridge, reject changing type to station/ibss */
 897         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 898             (ntype == NL80211_IFTYPE_ADHOC ||
 899              ntype == NL80211_IFTYPE_STATION ||
 900              ntype == NL80211_IFTYPE_P2P_CLIENT))
 901                 return -EBUSY;
 902
 903         if (ntype != otype && netif_running(dev)) {
 904                 dev->ieee80211_ptr->use_4addr = false;
 905                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 906                 wdev_lock(dev->ieee80211_ptr);
 907                 rdev_set_qos_map(rdev, dev, NULL);
 908                 wdev_unlock(dev->ieee80211_ptr);
 909
 910                 switch (otype) {
 911                 case NL80211_IFTYPE_AP:
 912                         cfg80211_stop_ap(rdev, dev, true);
 913                         break;
 914                 case NL80211_IFTYPE_ADHOC:
 915                         cfg80211_leave_ibss(rdev, dev, false);
 916                         break;
 917                 case NL80211_IFTYPE_STATION:
 918                 case NL80211_IFTYPE_P2P_CLIENT:
 919                         wdev_lock(dev->ieee80211_ptr);
 920                         cfg80211_disconnect(rdev, dev,
 921                                             WLAN_REASON_DEAUTH_LEAVING, true);
 922                         wdev_unlock(dev->ieee80211_ptr);
 923                         break;
 924                 case NL80211_IFTYPE_MESH_POINT:
 925                         /* mesh should be handled? */
 926                         break;
 927                 default:
 928                         break;
 929                 }
 930
 931                 cfg80211_process_rdev_events(rdev);
 932         }
 933
 934         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 935
 936         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 937
 938         if (!err && params && params->use_4addr != -1)
 939                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 940
 941         if (!err) {
 942                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 943                 switch (ntype) {
 944                 case NL80211_IFTYPE_STATION:
 945                         if (dev->ieee80211_ptr->use_4addr)
 946                                 break;
 947                         /* fall through */
 948                 case NL80211_IFTYPE_OCB:
 949                 case NL80211_IFTYPE_P2P_CLIENT:
 950                 case NL80211_IFTYPE_ADHOC:
 951                         dev->priv_flags |= IFF_DONT_BRIDGE;
 952                         break;
 953                 case NL80211_IFTYPE_P2P_GO:
 954                 case NL80211_IFTYPE_AP:
 955                 case NL80211_IFTYPE_AP_VLAN:
 956                 case NL80211_IFTYPE_WDS:
 957                 case NL80211_IFTYPE_MESH_POINT:
 958                         /* bridging OK */
 959                         break;
 960                 case NL80211_IFTYPE_MONITOR:
 961                         /* monitor can't bridge anyway */
 962                         break;
 963                 case NL80211_IFTYPE_UNSPECIFIED:
 964                 case NUM_NL80211_IFTYPES:
 965                         /* not happening */
 966                         break;
 967                 case NL80211_IFTYPE_P2P_DEVICE:
 968                         WARN_ON(1);
 969                         break;
 970                 }
 971         }
 972
 973         if (!err && ntype != otype && netif_running(dev)) {
 974                 cfg80211_update_iface_num(rdev, ntype, 1);
 975                 cfg80211_update_iface_num(rdev, otype, -1);
 976         }
 977
 978         return err;
 979 }
 980
 981 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 982 {
 983         static const u32 __mcs2bitrate[] = {
 984                 /* control PHY */
 985                 [0] =   275,
 986                 /* SC PHY */
 987                 [1] =  3850,
 988                 [2] =  7700,
 989                 [3] =  9625,
 990                 [4] = 11550,
 991                 [5] = 12512, /* 1251.25 mbps */
 992                 [6] = 15400,
 993                 [7] = 19250,
 994                 [8] = 23100,
 995                 [9] = 25025,
 996                 [10] = 30800,
 997                 [11] = 38500,
 998                 [12] = 46200,
 999                 /* OFDM PHY */
1000                 [13] =  6930,
1001                 [14] =  8662, /* 866.25 mbps */
1002                 [15] = 13860,
1003                 [16] = 17325,
1004                 [17] = 20790,
1005                 [18] = 27720,
1006                 [19] = 34650,
1007                 [20] = 41580,
1008                 [21] = 45045,
1009                 [22] = 51975,
1010                 [23] = 62370,
1011                 [24] = 67568, /* 6756.75 mbps */
1012                 /* LP-SC PHY */
1013                 [25] =  6260,
1014                 [26] =  8340,
1015                 [27] = 11120,
1016                 [28] = 12510,
1017                 [29] = 16680,
1018                 [30] = 22240,
1019                 [31] = 25030,
1020         };
1021
1022         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1023                 return 0;
1024
1025         return __mcs2bitrate[rate->mcs];
1026 }
1027
1028 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1029 {
1030         static const u32 base[4][10] = {
1031                 {   6500000,
1032                    13000000,
1033                    19500000,
1034                    26000000,
1035                    39000000,
1036                    52000000,
1037                    58500000,
1038                    65000000,
1039                    78000000,
1040                    0,
1041                 },
1042                 {  13500000,
1043                    27000000,
1044                    40500000,
1045                    54000000,
1046                    81000000,
1047                   108000000,
1048                   121500000,
1049                   135000000,
1050                   162000000,
1051                   180000000,
1052                 },
1053                 {  29300000,
1054                    58500000,
1055                    87800000,
1056                   117000000,
1057                   175500000,
1058                   234000000,
1059                   263300000,
1060                   292500000,
1061                   351000000,
1062                   390000000,
1063                 },
1064                 {  58500000,
1065                   117000000,
1066                   175500000,
1067                   234000000,
1068                   351000000,
1069                   468000000,
1070                   526500000,
1071                   585000000,
1072                   702000000,
1073                   780000000,
1074                 },
1075         };
1076         u32 bitrate;
1077         int idx;
1078
1079         if (WARN_ON_ONCE(rate->mcs > 9))
1080                 return 0;
1081
1082         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1083                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1084                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1085                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1086
1087         bitrate = base[idx][rate->mcs];
1088         bitrate *= rate->nss;
1089
1090         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1091                 bitrate = (bitrate / 9) * 10;
1092
1093         /* do NOT round down here */
1094         return (bitrate + 50000) / 100000;
1095 }
1096
1097 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1098 {
1099         int modulation, streams, bitrate;
1100
1101         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1102             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1103                 return rate->legacy;
1104         if (rate->flags & RATE_INFO_FLAGS_60G)
1105                 return cfg80211_calculate_bitrate_60g(rate);
1106         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1107                 return cfg80211_calculate_bitrate_vht(rate);
1108
1109         /* the formula below does only work for MCS values smaller than 32 */
1110         if (WARN_ON_ONCE(rate->mcs >= 32))
1111                 return 0;
1112
1113         modulation = rate->mcs & 7;
1114         streams = (rate->mcs >> 3) + 1;
1115
1116         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1117                         13500000 : 6500000;
1118
1119         if (modulation < 4)
1120                 bitrate *= (modulation + 1);
1121         else if (modulation == 4)
1122                 bitrate *= (modulation + 2);
1123         else
1124                 bitrate *= (modulation + 3);
1125
1126         bitrate *= streams;
1127
1128         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1129                 bitrate = (bitrate / 9) * 10;
1130
1131         /* do NOT round down here */
1132         return (bitrate + 50000) / 100000;
1133 }
1134 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1135
1136 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1137                           enum ieee80211_p2p_attr_id attr,
1138                           u8 *buf, unsigned int bufsize)
1139 {
1140         u8 *out = buf;
1141         u16 attr_remaining = 0;
1142         bool desired_attr = false;
1143         u16 desired_len = 0;
1144
1145         while (len > 0) {
1146                 unsigned int iedatalen;
1147                 unsigned int copy;
1148                 const u8 *iedata;
1149
1150                 if (len < 2)
1151                         return -EILSEQ;
1152                 iedatalen = ies[1];
1153                 if (iedatalen + 2 > len)
1154                         return -EILSEQ;
1155
1156                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1157                         goto cont;
1158
1159                 if (iedatalen < 4)
1160                         goto cont;
1161
1162                 iedata = ies + 2;
1163
1164                 /* check WFA OUI, P2P subtype */
1165                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1166                     iedata[2] != 0x9a || iedata[3] != 0x09)
1167                         goto cont;
1168
1169                 iedatalen -= 4;
1170                 iedata += 4;
1171
1172                 /* check attribute continuation into this IE */
1173                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1174                 if (copy && desired_attr) {
1175                         desired_len += copy;
1176                         if (out) {
1177                                 memcpy(out, iedata, min(bufsize, copy));
1178                                 out += min(bufsize, copy);
1179                                 bufsize -= min(bufsize, copy);
1180                         }
1181
1182
1183                         if (copy == attr_remaining)
1184                                 return desired_len;
1185                 }
1186
1187                 attr_remaining -= copy;
1188                 if (attr_remaining)
1189                         goto cont;
1190
1191                 iedatalen -= copy;
1192                 iedata += copy;
1193
1194                 while (iedatalen > 0) {
1195                         u16 attr_len;
1196
1197                         /* P2P attribute ID & size must fit */
1198                         if (iedatalen < 3)
1199                                 return -EILSEQ;
1200                         desired_attr = iedata[0] == attr;
1201                         attr_len = get_unaligned_le16(iedata + 1);
1202                         iedatalen -= 3;
1203                         iedata += 3;
1204
1205                         copy = min_t(unsigned int, attr_len, iedatalen);
1206
1207                         if (desired_attr) {
1208                                 desired_len += copy;
1209                                 if (out) {
1210                                         memcpy(out, iedata, min(bufsize, copy));
1211                                         out += min(bufsize, copy);
1212                                         bufsize -= min(bufsize, copy);
1213                                 }
1214
1215                                 if (copy == attr_len)
1216                                         return desired_len;
1217                         }
1218
1219                         iedata += copy;
1220                         iedatalen -= copy;
1221                         attr_remaining = attr_len - copy;
1222                 }
1223
1224  cont:
1225                 len -= ies[1] + 2;
1226                 ies += ies[1] + 2;
1227         }
1228
1229         if (attr_remaining && desired_attr)
1230                 return -EILSEQ;
1231
1232         return -ENOENT;
1233 }
1234 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1235
1236 bool ieee80211_operating_class_to_band(u8 operating_class,
1237                                        enum ieee80211_band *band)
1238 {
1239         switch (operating_class) {
1240         case 112:
1241         case 115 ... 127:
1242                 *band = IEEE80211_BAND_5GHZ;
1243                 return true;
1244         case 81:
1245         case 82:
1246         case 83:
1247         case 84:
1248                 *band = IEEE80211_BAND_2GHZ;
1249                 return true;
1250         case 180:
1251                 *band = IEEE80211_BAND_60GHZ;
1252                 return true;
1253         }
1254
1255         return false;
1256 }
1257 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1258
1259 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1260                                  u32 beacon_int)
1261 {
1262         struct wireless_dev *wdev;
1263         int res = 0;
1264
1265         if (!beacon_int)
1266                 return -EINVAL;
1267
1268         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1269                 if (!wdev->beacon_interval)
1270                         continue;
1271                 if (wdev->beacon_interval != beacon_int) {
1272                         res = -EINVAL;
1273                         break;
1274                 }
1275         }
1276
1277         return res;
1278 }
1279
1280 int cfg80211_iter_combinations(struct wiphy *wiphy,
1281                                const int num_different_channels,
1282                                const u8 radar_detect,
1283                                const int iftype_num[NUM_NL80211_IFTYPES],
1284                                void (*iter)(const struct ieee80211_iface_combination *c,
1285                                             void *data),
1286                                void *data)
1287 {
1288         const struct ieee80211_regdomain *regdom;
1289         enum nl80211_dfs_regions region = 0;
1290         int i, j, iftype;
1291         int num_interfaces = 0;
1292         u32 used_iftypes = 0;
1293
1294         if (radar_detect) {
1295                 rcu_read_lock();
1296                 regdom = rcu_dereference(cfg80211_regdomain);
1297                 if (regdom)
1298                         region = regdom->dfs_region;
1299                 rcu_read_unlock();
1300         }
1301
1302         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1303                 num_interfaces += iftype_num[iftype];
1304                 if (iftype_num[iftype] > 0 &&
1305                     !(wiphy->software_iftypes & BIT(iftype)))
1306                         used_iftypes |= BIT(iftype);
1307         }
1308
1309         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1310                 const struct ieee80211_iface_combination *c;
1311                 struct ieee80211_iface_limit *limits;
1312                 u32 all_iftypes = 0;
1313
1314                 c = &wiphy->iface_combinations[i];
1315
1316                 if (num_interfaces > c->max_interfaces)
1317                         continue;
1318                 if (num_different_channels > c->num_different_channels)
1319                         continue;
1320
1321                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1322                                  GFP_KERNEL);
1323                 if (!limits)
1324                         return -ENOMEM;
1325
1326                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1327                         if (wiphy->software_iftypes & BIT(iftype))
1328                                 continue;
1329                         for (j = 0; j < c->n_limits; j++) {
1330                                 all_iftypes |= limits[j].types;
1331                                 if (!(limits[j].types & BIT(iftype)))
1332                                         continue;
1333                                 if (limits[j].max < iftype_num[iftype])
1334                                         goto cont;
1335                                 limits[j].max -= iftype_num[iftype];
1336                         }
1337                 }
1338
1339                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1340                         goto cont;
1341
1342                 if (radar_detect && c->radar_detect_regions &&
1343                     !(c->radar_detect_regions & BIT(region)))
1344                         goto cont;
1345
1346                 /* Finally check that all iftypes that we're currently
1347                  * using are actually part of this combination. If they
1348                  * aren't then we can't use this combination and have
1349                  * to continue to the next.
1350                  */
1351                 if ((all_iftypes & used_iftypes) != used_iftypes)
1352                         goto cont;
1353
1354                 /* This combination covered all interface types and
1355                  * supported the requested numbers, so we're good.
1356                  */
1357
1358                 (*iter)(c, data);
1359  cont:
1360                 kfree(limits);
1361         }
1362
1363         return 0;
1364 }
1365 EXPORT_SYMBOL(cfg80211_iter_combinations);
1366
1367 static void
1368 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1369                           void *data)
1370 {
1371         int *num = data;
1372         (*num)++;
1373 }
1374
1375 int cfg80211_check_combinations(struct wiphy *wiphy,
1376                                 const int num_different_channels,
1377                                 const u8 radar_detect,
1378                                 const int iftype_num[NUM_NL80211_IFTYPES])
1379 {
1380         int err, num = 0;
1381
1382         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1383                                          radar_detect, iftype_num,
1384                                          cfg80211_iter_sum_ifcombs, &num);
1385         if (err)
1386                 return err;
1387         if (num == 0)
1388                 return -EBUSY;
1389
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(cfg80211_check_combinations);
1393
1394 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1395                                  struct wireless_dev *wdev,
1396                                  enum nl80211_iftype iftype,
1397                                  struct ieee80211_channel *chan,
1398                                  enum cfg80211_chan_mode chanmode,
1399                                  u8 radar_detect)
1400 {
1401         struct wireless_dev *wdev_iter;
1402         int num[NUM_NL80211_IFTYPES];
1403         struct ieee80211_channel
1404                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1405         struct ieee80211_channel *ch;
1406         enum cfg80211_chan_mode chmode;
1407         int num_different_channels = 0;
1408         int total = 1;
1409         int i;
1410
1411         ASSERT_RTNL();
1412
1413         if (WARN_ON(hweight32(radar_detect) > 1))
1414                 return -EINVAL;
1415
1416         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1417                 return -EINVAL;
1418
1419         /* Always allow software iftypes */
1420         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1421                 if (radar_detect)
1422                         return -EINVAL;
1423                 return 0;
1424         }
1425
1426         memset(num, 0, sizeof(num));
1427         memset(used_channels, 0, sizeof(used_channels));
1428
1429         num[iftype] = 1;
1430
1431         /* TODO: We'll probably not need this anymore, since this
1432          * should only be called with CHAN_MODE_UNDEFINED. There are
1433          * still a couple of pending calls where other chanmodes are
1434          * used, but we should get rid of them.
1435          */
1436         switch (chanmode) {
1437         case CHAN_MODE_UNDEFINED:
1438                 break;
1439         case CHAN_MODE_SHARED:
1440                 WARN_ON(!chan);
1441                 used_channels[0] = chan;
1442                 num_different_channels++;
1443                 break;
1444         case CHAN_MODE_EXCLUSIVE:
1445                 num_different_channels++;
1446                 break;
1447         }
1448
1449         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1450                 if (wdev_iter == wdev)
1451                         continue;
1452                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1453                         if (!wdev_iter->p2p_started)
1454                                 continue;
1455                 } else if (wdev_iter->netdev) {
1456                         if (!netif_running(wdev_iter->netdev))
1457                                 continue;
1458                 } else {
1459                         WARN_ON(1);
1460                 }
1461
1462                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1463                         continue;
1464
1465                 /*
1466                  * We may be holding the "wdev" mutex, but now need to lock
1467                  * wdev_iter. This is OK because once we get here wdev_iter
1468                  * is not wdev (tested above), but we need to use the nested
1469                  * locking for lockdep.
1470                  */
1471                 mutex_lock_nested(&wdev_iter->mtx, 1);
1472                 __acquire(wdev_iter->mtx);
1473                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1474                 wdev_unlock(wdev_iter);
1475
1476                 switch (chmode) {
1477                 case CHAN_MODE_UNDEFINED:
1478                         break;
1479                 case CHAN_MODE_SHARED:
1480                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1481                                 if (!used_channels[i] || used_channels[i] == ch)
1482                                         break;
1483
1484                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1485                                 return -EBUSY;
1486
1487                         if (used_channels[i] == NULL) {
1488                                 used_channels[i] = ch;
1489                                 num_different_channels++;
1490                         }
1491                         break;
1492                 case CHAN_MODE_EXCLUSIVE:
1493                         num_different_channels++;
1494                         break;
1495                 }
1496
1497                 num[wdev_iter->iftype]++;
1498                 total++;
1499         }
1500
1501         if (total == 1 && !radar_detect)
1502                 return 0;
1503
1504         return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1505                                            radar_detect, num);
1506 }
1507
1508 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1509                            const u8 *rates, unsigned int n_rates,
1510                            u32 *mask)
1511 {
1512         int i, j;
1513
1514         if (!sband)
1515                 return -EINVAL;
1516
1517         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1518                 return -EINVAL;
1519
1520         *mask = 0;
1521
1522         for (i = 0; i < n_rates; i++) {
1523                 int rate = (rates[i] & 0x7f) * 5;
1524                 bool found = false;
1525
1526                 for (j = 0; j < sband->n_bitrates; j++) {
1527                         if (sband->bitrates[j].bitrate == rate) {
1528                                 found = true;
1529                                 *mask |= BIT(j);
1530                                 break;
1531                         }
1532                 }
1533                 if (!found)
1534                         return -EINVAL;
1535         }
1536
1537         /*
1538          * mask must have at least one bit set here since we
1539          * didn't accept a 0-length rates array nor allowed
1540          * entries in the array that didn't exist
1541          */
1542
1543         return 0;
1544 }
1545
1546 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1547 {
1548         enum ieee80211_band band;
1549         unsigned int n_channels = 0;
1550
1551         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1552                 if (wiphy->bands[band])
1553                         n_channels += wiphy->bands[band]->n_channels;
1554
1555         return n_channels;
1556 }
1557 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1558
1559 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1560                          struct station_info *sinfo)
1561 {
1562         struct cfg80211_registered_device *rdev;
1563         struct wireless_dev *wdev;
1564
1565         wdev = dev->ieee80211_ptr;
1566         if (!wdev)
1567                 return -EOPNOTSUPP;
1568
1569         rdev = wiphy_to_rdev(wdev->wiphy);
1570         if (!rdev->ops->get_station)
1571                 return -EOPNOTSUPP;
1572
1573         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1574 }
1575 EXPORT_SYMBOL(cfg80211_get_station);
1576
1577 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1578 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1579 const unsigned char rfc1042_header[] __aligned(2) =
1580         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1581 EXPORT_SYMBOL(rfc1042_header);
1582
1583 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1584 const unsigned char bridge_tunnel_header[] __aligned(2) =
1585         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1586 EXPORT_SYMBOL(bridge_tunnel_header);