net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/export.h>
   7 #include <linux/bitops.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/slab.h>
  10 #include <net/cfg80211.h>
  11 #include <net/ip.h>
  12 #include <net/dsfield.h>
  13 #include "core.h"
  14 #include "rdev-ops.h"
  15
  16
  17 struct ieee80211_rate *
  18 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  19                             u32 basic_rates, int bitrate)
  20 {
  21         struct ieee80211_rate *result = &sband->bitrates[0];
  22         int i;
  23
  24         for (i = 0; i < sband->n_bitrates; i++) {
  25                 if (!(basic_rates & BIT(i)))
  26                         continue;
  27                 if (sband->bitrates[i].bitrate > bitrate)
  28                         continue;
  29                 result = &sband->bitrates[i];
  30         }
  31
  32         return result;
  33 }
  34 EXPORT_SYMBOL(ieee80211_get_response_rate);
  35
  36 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband)
  37 {
  38         struct ieee80211_rate *bitrates;
  39         u32 mandatory_rates = 0;
  40         enum ieee80211_rate_flags mandatory_flag;
  41         int i;
  42
  43         if (WARN_ON(!sband))
  44                 return 1;
  45
  46         if (sband->band == IEEE80211_BAND_2GHZ)
  47                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  48         else
  49                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  50
  51         bitrates = sband->bitrates;
  52         for (i = 0; i < sband->n_bitrates; i++)
  53                 if (bitrates[i].flags & mandatory_flag)
  54                         mandatory_rates |= BIT(i);
  55         return mandatory_rates;
  56 }
  57 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  58
  59 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  60 {
  61         /* see 802.11 17.3.8.3.2 and Annex J
  62          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  63         if (chan <= 0)
  64                 return 0; /* not supported */
  65         switch (band) {
  66         case IEEE80211_BAND_2GHZ:
  67                 if (chan == 14)
  68                         return 2484;
  69                 else if (chan < 14)
  70                         return 2407 + chan * 5;
  71                 break;
  72         case IEEE80211_BAND_5GHZ:
  73                 if (chan >= 182 && chan <= 196)
  74                         return 4000 + chan * 5;
  75                 else
  76                         return 5000 + chan * 5;
  77                 break;
  78         case IEEE80211_BAND_60GHZ:
  79                 if (chan < 5)
  80                         return 56160 + chan * 2160;
  81                 break;
  82         default:
  83                 ;
  84         }
  85         return 0; /* not supported */
  86 }
  87 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  88
  89 int ieee80211_frequency_to_channel(int freq)
  90 {
  91         /* see 802.11 17.3.8.3.2 and Annex J */
  92         if (freq == 2484)
  93                 return 14;
  94         else if (freq < 2484)
  95                 return (freq - 2407) / 5;
  96         else if (freq >= 4910 && freq <= 4980)
  97                 return (freq - 4000) / 5;
  98         else if (freq <= 45000) /* DMG band lower limit */
  99                 return (freq - 5000) / 5;
 100         else if (freq >= 58320 && freq <= 64800)
 101                 return (freq - 56160) / 2160;
 102         else
 103                 return 0;
 104 }
 105 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 106
 107 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 108                                                   int freq)
 109 {
 110         enum ieee80211_band band;
 111         struct ieee80211_supported_band *sband;
 112         int i;
 113
 114         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 115                 sband = wiphy->bands[band];
 116
 117                 if (!sband)
 118                         continue;
 119
 120                 for (i = 0; i < sband->n_channels; i++) {
 121                         if (sband->channels[i].center_freq == freq)
 122                                 return &sband->channels[i];
 123                 }
 124         }
 125
 126         return NULL;
 127 }
 128 EXPORT_SYMBOL(__ieee80211_get_channel);
 129
 130 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 131                                      enum ieee80211_band band)
 132 {
 133         int i, want;
 134
 135         switch (band) {
 136         case IEEE80211_BAND_5GHZ:
 137                 want = 3;
 138                 for (i = 0; i < sband->n_bitrates; i++) {
 139                         if (sband->bitrates[i].bitrate == 60 ||
 140                             sband->bitrates[i].bitrate == 120 ||
 141                             sband->bitrates[i].bitrate == 240) {
 142                                 sband->bitrates[i].flags |=
 143                                         IEEE80211_RATE_MANDATORY_A;
 144                                 want--;
 145                         }
 146                 }
 147                 WARN_ON(want);
 148                 break;
 149         case IEEE80211_BAND_2GHZ:
 150                 want = 7;
 151                 for (i = 0; i < sband->n_bitrates; i++) {
 152                         if (sband->bitrates[i].bitrate == 10) {
 153                                 sband->bitrates[i].flags |=
 154                                         IEEE80211_RATE_MANDATORY_B |
 155                                         IEEE80211_RATE_MANDATORY_G;
 156                                 want--;
 157                         }
 158
 159                         if (sband->bitrates[i].bitrate == 20 ||
 160                             sband->bitrates[i].bitrate == 55 ||
 161                             sband->bitrates[i].bitrate == 110 ||
 162                             sband->bitrates[i].bitrate == 60 ||
 163                             sband->bitrates[i].bitrate == 120 ||
 164                             sband->bitrates[i].bitrate == 240) {
 165                                 sband->bitrates[i].flags |=
 166                                         IEEE80211_RATE_MANDATORY_G;
 167                                 want--;
 168                         }
 169
 170                         if (sband->bitrates[i].bitrate != 10 &&
 171                             sband->bitrates[i].bitrate != 20 &&
 172                             sband->bitrates[i].bitrate != 55 &&
 173                             sband->bitrates[i].bitrate != 110)
 174                                 sband->bitrates[i].flags |=
 175                                         IEEE80211_RATE_ERP_G;
 176                 }
 177                 WARN_ON(want != 0 && want != 3 && want != 6);
 178                 break;
 179         case IEEE80211_BAND_60GHZ:
 180                 /* check for mandatory HT MCS 1..4 */
 181                 WARN_ON(!sband->ht_cap.ht_supported);
 182                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 183                 break;
 184         case IEEE80211_NUM_BANDS:
 185                 WARN_ON(1);
 186                 break;
 187         }
 188 }
 189
 190 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 191 {
 192         enum ieee80211_band band;
 193
 194         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 195                 if (wiphy->bands[band])
 196                         set_mandatory_flags_band(wiphy->bands[band], band);
 197 }
 198
 199 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 200 {
 201         int i;
 202         for (i = 0; i < wiphy->n_cipher_suites; i++)
 203                 if (cipher == wiphy->cipher_suites[i])
 204                         return true;
 205         return false;
 206 }
 207
 208 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 209                                    struct key_params *params, int key_idx,
 210                                    bool pairwise, const u8 *mac_addr)
 211 {
 212         if (key_idx > 5)
 213                 return -EINVAL;
 214
 215         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 216                 return -EINVAL;
 217
 218         if (pairwise && !mac_addr)
 219                 return -EINVAL;
 220
 221         /*
 222          * Disallow pairwise keys with non-zero index unless it's WEP
 223          * or a vendor specific cipher (because current deployments use
 224          * pairwise WEP keys with non-zero indices and for vendor specific
 225          * ciphers this should be validated in the driver or hardware level
 226          * - but 802.11i clearly specifies to use zero)
 227          */
 228         if (pairwise && key_idx &&
 229             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 230              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 231              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 232                 return -EINVAL;
 233
 234         switch (params->cipher) {
 235         case WLAN_CIPHER_SUITE_WEP40:
 236                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 237                         return -EINVAL;
 238                 break;
 239         case WLAN_CIPHER_SUITE_TKIP:
 240                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 241                         return -EINVAL;
 242                 break;
 243         case WLAN_CIPHER_SUITE_CCMP:
 244                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 245                         return -EINVAL;
 246                 break;
 247         case WLAN_CIPHER_SUITE_WEP104:
 248                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 249                         return -EINVAL;
 250                 break;
 251         case WLAN_CIPHER_SUITE_AES_CMAC:
 252                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 253                         return -EINVAL;
 254                 break;
 255         default:
 256                 /*
 257                  * We don't know anything about this algorithm,
 258                  * allow using it -- but the driver must check
 259                  * all parameters! We still check below whether
 260                  * or not the driver supports this algorithm,
 261                  * of course.
 262                  */
 263                 break;
 264         }
 265
 266         if (params->seq) {
 267                 switch (params->cipher) {
 268                 case WLAN_CIPHER_SUITE_WEP40:
 269                 case WLAN_CIPHER_SUITE_WEP104:
 270                         /* These ciphers do not use key sequence */
 271                         return -EINVAL;
 272                 case WLAN_CIPHER_SUITE_TKIP:
 273                 case WLAN_CIPHER_SUITE_CCMP:
 274                 case WLAN_CIPHER_SUITE_AES_CMAC:
 275                         if (params->seq_len != 6)
 276                                 return -EINVAL;
 277                         break;
 278                 }
 279         }
 280
 281         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 282                 return -EINVAL;
 283
 284         return 0;
 285 }
 286
 287 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 288 {
 289         unsigned int hdrlen = 24;
 290
 291         if (ieee80211_is_data(fc)) {
 292                 if (ieee80211_has_a4(fc))
 293                         hdrlen = 30;
 294                 if (ieee80211_is_data_qos(fc)) {
 295                         hdrlen += IEEE80211_QOS_CTL_LEN;
 296                         if (ieee80211_has_order(fc))
 297                                 hdrlen += IEEE80211_HT_CTL_LEN;
 298                 }
 299                 goto out;
 300         }
 301
 302         if (ieee80211_is_ctl(fc)) {
 303                 /*
 304                  * ACK and CTS are 10 bytes, all others 16. To see how
 305                  * to get this condition consider
 306                  *   subtype mask:   0b0000000011110000 (0x00F0)
 307                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 308                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 309                  *   bits that matter:         ^^^      (0x00E0)
 310                  *   value of those: 0b0000000011000000 (0x00C0)
 311                  */
 312                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 313                         hdrlen = 10;
 314                 else
 315                         hdrlen = 16;
 316         }
 317 out:
 318         return hdrlen;
 319 }
 320 EXPORT_SYMBOL(ieee80211_hdrlen);
 321
 322 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 323 {
 324         const struct ieee80211_hdr *hdr =
 325                         (const struct ieee80211_hdr *)skb->data;
 326         unsigned int hdrlen;
 327
 328         if (unlikely(skb->len < 10))
 329                 return 0;
 330         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 331         if (unlikely(hdrlen > skb->len))
 332                 return 0;
 333         return hdrlen;
 334 }
 335 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 336
 337 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 338 {
 339         int ae = meshhdr->flags & MESH_FLAGS_AE;
 340         /* 802.11-2012, 8.2.4.7.3 */
 341         switch (ae) {
 342         default:
 343         case 0:
 344                 return 6;
 345         case MESH_FLAGS_AE_A4:
 346                 return 12;
 347         case MESH_FLAGS_AE_A5_A6:
 348                 return 18;
 349         }
 350 }
 351 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 352
 353 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 354                            enum nl80211_iftype iftype)
 355 {
 356         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 357         u16 hdrlen, ethertype;
 358         u8 *payload;
 359         u8 dst[ETH_ALEN];
 360         u8 src[ETH_ALEN] __aligned(2);
 361
 362         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 363                 return -1;
 364
 365         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 366
 367         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 368          * header
 369          * IEEE 802.11 address fields:
 370          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 371          *   0     0   DA    SA    BSSID n/a
 372          *   0     1   DA    BSSID SA    n/a
 373          *   1     0   BSSID SA    DA    n/a
 374          *   1     1   RA    TA    DA    SA
 375          */
 376         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 377         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 378
 379         switch (hdr->frame_control &
 380                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 381         case cpu_to_le16(IEEE80211_FCTL_TODS):
 382                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 383                              iftype != NL80211_IFTYPE_AP_VLAN &&
 384                              iftype != NL80211_IFTYPE_P2P_GO))
 385                         return -1;
 386                 break;
 387         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 388                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 389                              iftype != NL80211_IFTYPE_MESH_POINT &&
 390                              iftype != NL80211_IFTYPE_AP_VLAN &&
 391                              iftype != NL80211_IFTYPE_STATION))
 392                         return -1;
 393                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 394                         struct ieee80211s_hdr *meshdr =
 395                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 396                         /* make sure meshdr->flags is on the linear part */
 397                         if (!pskb_may_pull(skb, hdrlen + 1))
 398                                 return -1;
 399                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 400                                 return -1;
 401                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 402                                 skb_copy_bits(skb, hdrlen +
 403                                         offsetof(struct ieee80211s_hdr, eaddr1),
 404                                         dst, ETH_ALEN);
 405                                 skb_copy_bits(skb, hdrlen +
 406                                         offsetof(struct ieee80211s_hdr, eaddr2),
 407                                         src, ETH_ALEN);
 408                         }
 409                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 410                 }
 411                 break;
 412         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 413                 if ((iftype != NL80211_IFTYPE_STATION &&
 414                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 415                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 416                     (is_multicast_ether_addr(dst) &&
 417                      ether_addr_equal(src, addr)))
 418                         return -1;
 419                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 420                         struct ieee80211s_hdr *meshdr =
 421                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 422                         /* make sure meshdr->flags is on the linear part */
 423                         if (!pskb_may_pull(skb, hdrlen + 1))
 424                                 return -1;
 425                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 426                                 return -1;
 427                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 428                                 skb_copy_bits(skb, hdrlen +
 429                                         offsetof(struct ieee80211s_hdr, eaddr1),
 430                                         src, ETH_ALEN);
 431                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 432                 }
 433                 break;
 434         case cpu_to_le16(0):
 435                 if (iftype != NL80211_IFTYPE_ADHOC &&
 436                     iftype != NL80211_IFTYPE_STATION)
 437                                 return -1;
 438                 break;
 439         }
 440
 441         if (!pskb_may_pull(skb, hdrlen + 8))
 442                 return -1;
 443
 444         payload = skb->data + hdrlen;
 445         ethertype = (payload[6] << 8) | payload[7];
 446
 447         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 448                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 449                    ether_addr_equal(payload, bridge_tunnel_header))) {
 450                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 451                  * replace EtherType */
 452                 skb_pull(skb, hdrlen + 6);
 453                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 454                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 455         } else {
 456                 struct ethhdr *ehdr;
 457                 __be16 len;
 458
 459                 skb_pull(skb, hdrlen);
 460                 len = htons(skb->len);
 461                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 462                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 463                 memcpy(ehdr->h_source, src, ETH_ALEN);
 464                 ehdr->h_proto = len;
 465         }
 466         return 0;
 467 }
 468 EXPORT_SYMBOL(ieee80211_data_to_8023);
 469
 470 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 471                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 472 {
 473         struct ieee80211_hdr hdr;
 474         u16 hdrlen, ethertype;
 475         __le16 fc;
 476         const u8 *encaps_data;
 477         int encaps_len, skip_header_bytes;
 478         int nh_pos, h_pos;
 479         int head_need;
 480
 481         if (unlikely(skb->len < ETH_HLEN))
 482                 return -EINVAL;
 483
 484         nh_pos = skb_network_header(skb) - skb->data;
 485         h_pos = skb_transport_header(skb) - skb->data;
 486
 487         /* convert Ethernet header to proper 802.11 header (based on
 488          * operation mode) */
 489         ethertype = (skb->data[12] << 8) | skb->data[13];
 490         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 491
 492         switch (iftype) {
 493         case NL80211_IFTYPE_AP:
 494         case NL80211_IFTYPE_AP_VLAN:
 495         case NL80211_IFTYPE_P2P_GO:
 496                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 497                 /* DA BSSID SA */
 498                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 499                 memcpy(hdr.addr2, addr, ETH_ALEN);
 500                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 501                 hdrlen = 24;
 502                 break;
 503         case NL80211_IFTYPE_STATION:
 504         case NL80211_IFTYPE_P2P_CLIENT:
 505                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 506                 /* BSSID SA DA */
 507                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 508                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 509                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 510                 hdrlen = 24;
 511                 break;
 512         case NL80211_IFTYPE_ADHOC:
 513                 /* DA SA BSSID */
 514                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 515                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 516                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 517                 hdrlen = 24;
 518                 break;
 519         default:
 520                 return -EOPNOTSUPP;
 521         }
 522
 523         if (qos) {
 524                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 525                 hdrlen += 2;
 526         }
 527
 528         hdr.frame_control = fc;
 529         hdr.duration_id = 0;
 530         hdr.seq_ctrl = 0;
 531
 532         skip_header_bytes = ETH_HLEN;
 533         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 534                 encaps_data = bridge_tunnel_header;
 535                 encaps_len = sizeof(bridge_tunnel_header);
 536                 skip_header_bytes -= 2;
 537         } else if (ethertype >= ETH_P_802_3_MIN) {
 538                 encaps_data = rfc1042_header;
 539                 encaps_len = sizeof(rfc1042_header);
 540                 skip_header_bytes -= 2;
 541         } else {
 542                 encaps_data = NULL;
 543                 encaps_len = 0;
 544         }
 545
 546         skb_pull(skb, skip_header_bytes);
 547         nh_pos -= skip_header_bytes;
 548         h_pos -= skip_header_bytes;
 549
 550         head_need = hdrlen + encaps_len - skb_headroom(skb);
 551
 552         if (head_need > 0 || skb_cloned(skb)) {
 553                 head_need = max(head_need, 0);
 554                 if (head_need)
 555                         skb_orphan(skb);
 556
 557                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 558                         return -ENOMEM;
 559
 560                 skb->truesize += head_need;
 561         }
 562
 563         if (encaps_data) {
 564                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 565                 nh_pos += encaps_len;
 566                 h_pos += encaps_len;
 567         }
 568
 569         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 570
 571         nh_pos += hdrlen;
 572         h_pos += hdrlen;
 573
 574         /* Update skb pointers to various headers since this modified frame
 575          * is going to go through Linux networking code that may potentially
 576          * need things like pointer to IP header. */
 577         skb_set_mac_header(skb, 0);
 578         skb_set_network_header(skb, nh_pos);
 579         skb_set_transport_header(skb, h_pos);
 580
 581         return 0;
 582 }
 583 EXPORT_SYMBOL(ieee80211_data_from_8023);
 584
 585
 586 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 587                               const u8 *addr, enum nl80211_iftype iftype,
 588                               const unsigned int extra_headroom,
 589                               bool has_80211_header)
 590 {
 591         struct sk_buff *frame = NULL;
 592         u16 ethertype;
 593         u8 *payload;
 594         const struct ethhdr *eth;
 595         int remaining, err;
 596         u8 dst[ETH_ALEN], src[ETH_ALEN];
 597
 598         if (has_80211_header) {
 599                 err = ieee80211_data_to_8023(skb, addr, iftype);
 600                 if (err)
 601                         goto out;
 602
 603                 /* skip the wrapping header */
 604                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 605                 if (!eth)
 606                         goto out;
 607         } else {
 608                 eth = (struct ethhdr *) skb->data;
 609         }
 610
 611         while (skb != frame) {
 612                 u8 padding;
 613                 __be16 len = eth->h_proto;
 614                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 615
 616                 remaining = skb->len;
 617                 memcpy(dst, eth->h_dest, ETH_ALEN);
 618                 memcpy(src, eth->h_source, ETH_ALEN);
 619
 620                 padding = (4 - subframe_len) & 0x3;
 621                 /* the last MSDU has no padding */
 622                 if (subframe_len > remaining)
 623                         goto purge;
 624
 625                 skb_pull(skb, sizeof(struct ethhdr));
 626                 /* reuse skb for the last subframe */
 627                 if (remaining <= subframe_len + padding)
 628                         frame = skb;
 629                 else {
 630                         unsigned int hlen = ALIGN(extra_headroom, 4);
 631                         /*
 632                          * Allocate and reserve two bytes more for payload
 633                          * alignment since sizeof(struct ethhdr) is 14.
 634                          */
 635                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 636                         if (!frame)
 637                                 goto purge;
 638
 639                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 640                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 641                                 ntohs(len));
 642
 643                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 644                                                         padding);
 645                         if (!eth) {
 646                                 dev_kfree_skb(frame);
 647                                 goto purge;
 648                         }
 649                 }
 650
 651                 skb_reset_network_header(frame);
 652                 frame->dev = skb->dev;
 653                 frame->priority = skb->priority;
 654
 655                 payload = frame->data;
 656                 ethertype = (payload[6] << 8) | payload[7];
 657
 658                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 659                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 660                            ether_addr_equal(payload, bridge_tunnel_header))) {
 661                         /* remove RFC1042 or Bridge-Tunnel
 662                          * encapsulation and replace EtherType */
 663                         skb_pull(frame, 6);
 664                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 665                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 666                 } else {
 667                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 668                                 sizeof(__be16));
 669                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 670                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 671                 }
 672                 __skb_queue_tail(list, frame);
 673         }
 674
 675         return;
 676
 677  purge:
 678         __skb_queue_purge(list);
 679  out:
 680         dev_kfree_skb(skb);
 681 }
 682 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 683
 684 /* Given a data frame determine the 802.1p/1d tag to use. */
 685 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 686 {
 687         unsigned int dscp;
 688
 689         /* skb->priority values from 256->263 are magic values to
 690          * directly indicate a specific 802.1d priority.  This is used
 691          * to allow 802.1d priority to be passed directly in from VLAN
 692          * tags, etc.
 693          */
 694         if (skb->priority >= 256 && skb->priority <= 263)
 695                 return skb->priority - 256;
 696
 697         switch (skb->protocol) {
 698         case htons(ETH_P_IP):
 699                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 700                 break;
 701         case htons(ETH_P_IPV6):
 702                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 703                 break;
 704         default:
 705                 return 0;
 706         }
 707
 708         return dscp >> 5;
 709 }
 710 EXPORT_SYMBOL(cfg80211_classify8021d);
 711
 712 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 713 {
 714         const struct cfg80211_bss_ies *ies;
 715
 716         ies = rcu_dereference(bss->ies);
 717         if (!ies)
 718                 return NULL;
 719
 720         return cfg80211_find_ie(ie, ies->data, ies->len);
 721 }
 722 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 723
 724 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 725 {
 726         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 727         struct net_device *dev = wdev->netdev;
 728         int i;
 729
 730         if (!wdev->connect_keys)
 731                 return;
 732
 733         for (i = 0; i < 6; i++) {
 734                 if (!wdev->connect_keys->params[i].cipher)
 735                         continue;
 736                 if (rdev_add_key(rdev, dev, i, false, NULL,
 737                                  &wdev->connect_keys->params[i])) {
 738                         netdev_err(dev, "failed to set key %d\n", i);
 739                         continue;
 740                 }
 741                 if (wdev->connect_keys->def == i)
 742                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 743                                 netdev_err(dev, "failed to set defkey %d\n", i);
 744                                 continue;
 745                         }
 746                 if (wdev->connect_keys->defmgmt == i)
 747                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 748                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 749         }
 750
 751         kfree(wdev->connect_keys);
 752         wdev->connect_keys = NULL;
 753 }
 754
 755 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 756 {
 757         struct cfg80211_event *ev;
 758         unsigned long flags;
 759         const u8 *bssid = NULL;
 760
 761         spin_lock_irqsave(&wdev->event_lock, flags);
 762         while (!list_empty(&wdev->event_list)) {
 763                 ev = list_first_entry(&wdev->event_list,
 764                                       struct cfg80211_event, list);
 765                 list_del(&ev->list);
 766                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 767
 768                 wdev_lock(wdev);
 769                 switch (ev->type) {
 770                 case EVENT_CONNECT_RESULT:
 771                         if (!is_zero_ether_addr(ev->cr.bssid))
 772                                 bssid = ev->cr.bssid;
 773                         __cfg80211_connect_result(
 774                                 wdev->netdev, bssid,
 775                                 ev->cr.req_ie, ev->cr.req_ie_len,
 776                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 777                                 ev->cr.status,
 778                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 779                                 NULL);
 780                         break;
 781                 case EVENT_ROAMED:
 782                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 783                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 784                                           ev->rm.resp_ie_len);
 785                         break;
 786                 case EVENT_DISCONNECTED:
 787                         __cfg80211_disconnected(wdev->netdev,
 788                                                 ev->dc.ie, ev->dc.ie_len,
 789                                                 ev->dc.reason, true);
 790                         break;
 791                 case EVENT_IBSS_JOINED:
 792                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 793                         break;
 794                 }
 795                 wdev_unlock(wdev);
 796
 797                 kfree(ev);
 798
 799                 spin_lock_irqsave(&wdev->event_lock, flags);
 800         }
 801         spin_unlock_irqrestore(&wdev->event_lock, flags);
 802 }
 803
 804 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 805 {
 806         struct wireless_dev *wdev;
 807
 808         ASSERT_RTNL();
 809         ASSERT_RDEV_LOCK(rdev);
 810
 811         list_for_each_entry(wdev, &rdev->wdev_list, list)
 812                 cfg80211_process_wdev_events(wdev);
 813 }
 814
 815 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 816                           struct net_device *dev, enum nl80211_iftype ntype,
 817                           u32 *flags, struct vif_params *params)
 818 {
 819         int err;
 820         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 821
 822         ASSERT_RDEV_LOCK(rdev);
 823
 824         /* don't support changing VLANs, you just re-create them */
 825         if (otype == NL80211_IFTYPE_AP_VLAN)
 826                 return -EOPNOTSUPP;
 827
 828         /* cannot change into P2P device type */
 829         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 830                 return -EOPNOTSUPP;
 831
 832         if (!rdev->ops->change_virtual_intf ||
 833             !(rdev->wiphy.interface_modes & (1 << ntype)))
 834                 return -EOPNOTSUPP;
 835
 836         /* if it's part of a bridge, reject changing type to station/ibss */
 837         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 838             (ntype == NL80211_IFTYPE_ADHOC ||
 839              ntype == NL80211_IFTYPE_STATION ||
 840              ntype == NL80211_IFTYPE_P2P_CLIENT))
 841                 return -EBUSY;
 842
 843         if (ntype != otype && netif_running(dev)) {
 844                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 845                                                     ntype);
 846                 if (err)
 847                         return err;
 848
 849                 dev->ieee80211_ptr->use_4addr = false;
 850                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 851
 852                 switch (otype) {
 853                 case NL80211_IFTYPE_AP:
 854                         cfg80211_stop_ap(rdev, dev);
 855                         break;
 856                 case NL80211_IFTYPE_ADHOC:
 857                         cfg80211_leave_ibss(rdev, dev, false);
 858                         break;
 859                 case NL80211_IFTYPE_STATION:
 860                 case NL80211_IFTYPE_P2P_CLIENT:
 861                         wdev_lock(dev->ieee80211_ptr);
 862                         cfg80211_disconnect(rdev, dev,
 863                                             WLAN_REASON_DEAUTH_LEAVING, true);
 864                         wdev_unlock(dev->ieee80211_ptr);
 865                         break;
 866                 case NL80211_IFTYPE_MESH_POINT:
 867                         /* mesh should be handled? */
 868                         break;
 869                 default:
 870                         break;
 871                 }
 872
 873                 cfg80211_process_rdev_events(rdev);
 874         }
 875
 876         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 877
 878         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 879
 880         if (!err && params && params->use_4addr != -1)
 881                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 882
 883         if (!err) {
 884                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 885                 switch (ntype) {
 886                 case NL80211_IFTYPE_STATION:
 887                         if (dev->ieee80211_ptr->use_4addr)
 888                                 break;
 889                         /* fall through */
 890                 case NL80211_IFTYPE_P2P_CLIENT:
 891                 case NL80211_IFTYPE_ADHOC:
 892                         dev->priv_flags |= IFF_DONT_BRIDGE;
 893                         break;
 894                 case NL80211_IFTYPE_P2P_GO:
 895                 case NL80211_IFTYPE_AP:
 896                 case NL80211_IFTYPE_AP_VLAN:
 897                 case NL80211_IFTYPE_WDS:
 898                 case NL80211_IFTYPE_MESH_POINT:
 899                         /* bridging OK */
 900                         break;
 901                 case NL80211_IFTYPE_MONITOR:
 902                         /* monitor can't bridge anyway */
 903                         break;
 904                 case NL80211_IFTYPE_UNSPECIFIED:
 905                 case NUM_NL80211_IFTYPES:
 906                         /* not happening */
 907                         break;
 908                 case NL80211_IFTYPE_P2P_DEVICE:
 909                         WARN_ON(1);
 910                         break;
 911                 }
 912         }
 913
 914         if (!err && ntype != otype && netif_running(dev)) {
 915                 cfg80211_update_iface_num(rdev, ntype, 1);
 916                 cfg80211_update_iface_num(rdev, otype, -1);
 917         }
 918
 919         return err;
 920 }
 921
 922 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 923 {
 924         static const u32 __mcs2bitrate[] = {
 925                 /* control PHY */
 926                 [0] =   275,
 927                 /* SC PHY */
 928                 [1] =  3850,
 929                 [2] =  7700,
 930                 [3] =  9625,
 931                 [4] = 11550,
 932                 [5] = 12512, /* 1251.25 mbps */
 933                 [6] = 15400,
 934                 [7] = 19250,
 935                 [8] = 23100,
 936                 [9] = 25025,
 937                 [10] = 30800,
 938                 [11] = 38500,
 939                 [12] = 46200,
 940                 /* OFDM PHY */
 941                 [13] =  6930,
 942                 [14] =  8662, /* 866.25 mbps */
 943                 [15] = 13860,
 944                 [16] = 17325,
 945                 [17] = 20790,
 946                 [18] = 27720,
 947                 [19] = 34650,
 948                 [20] = 41580,
 949                 [21] = 45045,
 950                 [22] = 51975,
 951                 [23] = 62370,
 952                 [24] = 67568, /* 6756.75 mbps */
 953                 /* LP-SC PHY */
 954                 [25] =  6260,
 955                 [26] =  8340,
 956                 [27] = 11120,
 957                 [28] = 12510,
 958                 [29] = 16680,
 959                 [30] = 22240,
 960                 [31] = 25030,
 961         };
 962
 963         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
 964                 return 0;
 965
 966         return __mcs2bitrate[rate->mcs];
 967 }
 968
 969 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
 970 {
 971         static const u32 base[4][10] = {
 972                 {   6500000,
 973                    13000000,
 974                    19500000,
 975                    26000000,
 976                    39000000,
 977                    52000000,
 978                    58500000,
 979                    65000000,
 980                    78000000,
 981                    0,
 982                 },
 983                 {  13500000,
 984                    27000000,
 985                    40500000,
 986                    54000000,
 987                    81000000,
 988                   108000000,
 989                   121500000,
 990                   135000000,
 991                   162000000,
 992                   180000000,
 993                 },
 994                 {  29300000,
 995                    58500000,
 996                    87800000,
 997                   117000000,
 998                   175500000,
 999                   234000000,
1000                   263300000,
1001                   292500000,
1002                   351000000,
1003                   390000000,
1004                 },
1005                 {  58500000,
1006                   117000000,
1007                   175500000,
1008                   234000000,
1009                   351000000,
1010                   468000000,
1011                   526500000,
1012                   585000000,
1013                   702000000,
1014                   780000000,
1015                 },
1016         };
1017         u32 bitrate;
1018         int idx;
1019
1020         if (WARN_ON_ONCE(rate->mcs > 9))
1021                 return 0;
1022
1023         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1024                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1025                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1026                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1027
1028         bitrate = base[idx][rate->mcs];
1029         bitrate *= rate->nss;
1030
1031         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1032                 bitrate = (bitrate / 9) * 10;
1033
1034         /* do NOT round down here */
1035         return (bitrate + 50000) / 100000;
1036 }
1037
1038 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1039 {
1040         int modulation, streams, bitrate;
1041
1042         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1043             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1044                 return rate->legacy;
1045         if (rate->flags & RATE_INFO_FLAGS_60G)
1046                 return cfg80211_calculate_bitrate_60g(rate);
1047         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1048                 return cfg80211_calculate_bitrate_vht(rate);
1049
1050         /* the formula below does only work for MCS values smaller than 32 */
1051         if (WARN_ON_ONCE(rate->mcs >= 32))
1052                 return 0;
1053
1054         modulation = rate->mcs & 7;
1055         streams = (rate->mcs >> 3) + 1;
1056
1057         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1058                         13500000 : 6500000;
1059
1060         if (modulation < 4)
1061                 bitrate *= (modulation + 1);
1062         else if (modulation == 4)
1063                 bitrate *= (modulation + 2);
1064         else
1065                 bitrate *= (modulation + 3);
1066
1067         bitrate *= streams;
1068
1069         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1070                 bitrate = (bitrate / 9) * 10;
1071
1072         /* do NOT round down here */
1073         return (bitrate + 50000) / 100000;
1074 }
1075 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1076
1077 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1078                           enum ieee80211_p2p_attr_id attr,
1079                           u8 *buf, unsigned int bufsize)
1080 {
1081         u8 *out = buf;
1082         u16 attr_remaining = 0;
1083         bool desired_attr = false;
1084         u16 desired_len = 0;
1085
1086         while (len > 0) {
1087                 unsigned int iedatalen;
1088                 unsigned int copy;
1089                 const u8 *iedata;
1090
1091                 if (len < 2)
1092                         return -EILSEQ;
1093                 iedatalen = ies[1];
1094                 if (iedatalen + 2 > len)
1095                         return -EILSEQ;
1096
1097                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1098                         goto cont;
1099
1100                 if (iedatalen < 4)
1101                         goto cont;
1102
1103                 iedata = ies + 2;
1104
1105                 /* check WFA OUI, P2P subtype */
1106                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1107                     iedata[2] != 0x9a || iedata[3] != 0x09)
1108                         goto cont;
1109
1110                 iedatalen -= 4;
1111                 iedata += 4;
1112
1113                 /* check attribute continuation into this IE */
1114                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1115                 if (copy && desired_attr) {
1116                         desired_len += copy;
1117                         if (out) {
1118                                 memcpy(out, iedata, min(bufsize, copy));
1119                                 out += min(bufsize, copy);
1120                                 bufsize -= min(bufsize, copy);
1121                         }
1122
1123
1124                         if (copy == attr_remaining)
1125                                 return desired_len;
1126                 }
1127
1128                 attr_remaining -= copy;
1129                 if (attr_remaining)
1130                         goto cont;
1131
1132                 iedatalen -= copy;
1133                 iedata += copy;
1134
1135                 while (iedatalen > 0) {
1136                         u16 attr_len;
1137
1138                         /* P2P attribute ID & size must fit */
1139                         if (iedatalen < 3)
1140                                 return -EILSEQ;
1141                         desired_attr = iedata[0] == attr;
1142                         attr_len = get_unaligned_le16(iedata + 1);
1143                         iedatalen -= 3;
1144                         iedata += 3;
1145
1146                         copy = min_t(unsigned int, attr_len, iedatalen);
1147
1148                         if (desired_attr) {
1149                                 desired_len += copy;
1150                                 if (out) {
1151                                         memcpy(out, iedata, min(bufsize, copy));
1152                                         out += min(bufsize, copy);
1153                                         bufsize -= min(bufsize, copy);
1154                                 }
1155
1156                                 if (copy == attr_len)
1157                                         return desired_len;
1158                         }
1159
1160                         iedata += copy;
1161                         iedatalen -= copy;
1162                         attr_remaining = attr_len - copy;
1163                 }
1164
1165  cont:
1166                 len -= ies[1] + 2;
1167                 ies += ies[1] + 2;
1168         }
1169
1170         if (attr_remaining && desired_attr)
1171                 return -EILSEQ;
1172
1173         return -ENOENT;
1174 }
1175 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1176
1177 bool ieee80211_operating_class_to_band(u8 operating_class,
1178                                        enum ieee80211_band *band)
1179 {
1180         switch (operating_class) {
1181         case 112:
1182         case 115 ... 127:
1183                 *band = IEEE80211_BAND_5GHZ;
1184                 return true;
1185         case 81:
1186         case 82:
1187         case 83:
1188         case 84:
1189                 *band = IEEE80211_BAND_2GHZ;
1190                 return true;
1191         case 180:
1192                 *band = IEEE80211_BAND_60GHZ;
1193                 return true;
1194         }
1195
1196         return false;
1197 }
1198 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1199
1200 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1201                                  u32 beacon_int)
1202 {
1203         struct wireless_dev *wdev;
1204         int res = 0;
1205
1206         if (!beacon_int)
1207                 return -EINVAL;
1208
1209         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1210                 if (!wdev->beacon_interval)
1211                         continue;
1212                 if (wdev->beacon_interval != beacon_int) {
1213                         res = -EINVAL;
1214                         break;
1215                 }
1216         }
1217
1218         return res;
1219 }
1220
1221 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1222                                  struct wireless_dev *wdev,
1223                                  enum nl80211_iftype iftype,
1224                                  struct ieee80211_channel *chan,
1225                                  enum cfg80211_chan_mode chanmode,
1226                                  u8 radar_detect)
1227 {
1228         struct wireless_dev *wdev_iter;
1229         u32 used_iftypes = BIT(iftype);
1230         int num[NUM_NL80211_IFTYPES];
1231         struct ieee80211_channel
1232                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1233         struct ieee80211_channel *ch;
1234         enum cfg80211_chan_mode chmode;
1235         int num_different_channels = 0;
1236         int total = 1;
1237         bool radar_required;
1238         int i, j;
1239
1240         ASSERT_RTNL();
1241
1242         if (WARN_ON(hweight32(radar_detect) > 1))
1243                 return -EINVAL;
1244
1245         switch (iftype) {
1246         case NL80211_IFTYPE_ADHOC:
1247         case NL80211_IFTYPE_AP:
1248         case NL80211_IFTYPE_AP_VLAN:
1249         case NL80211_IFTYPE_MESH_POINT:
1250         case NL80211_IFTYPE_P2P_GO:
1251         case NL80211_IFTYPE_WDS:
1252                 radar_required = !!(chan &&
1253                                     (chan->flags & IEEE80211_CHAN_RADAR));
1254                 break;
1255         case NL80211_IFTYPE_P2P_CLIENT:
1256         case NL80211_IFTYPE_STATION:
1257         case NL80211_IFTYPE_P2P_DEVICE:
1258         case NL80211_IFTYPE_MONITOR:
1259                 radar_required = false;
1260                 break;
1261         case NUM_NL80211_IFTYPES:
1262         case NL80211_IFTYPE_UNSPECIFIED:
1263         default:
1264                 return -EINVAL;
1265         }
1266
1267         if (radar_required && !radar_detect)
1268                 return -EINVAL;
1269
1270         /* Always allow software iftypes */
1271         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1272                 if (radar_detect)
1273                         return -EINVAL;
1274                 return 0;
1275         }
1276
1277         memset(num, 0, sizeof(num));
1278         memset(used_channels, 0, sizeof(used_channels));
1279
1280         num[iftype] = 1;
1281
1282         switch (chanmode) {
1283         case CHAN_MODE_UNDEFINED:
1284                 break;
1285         case CHAN_MODE_SHARED:
1286                 WARN_ON(!chan);
1287                 used_channels[0] = chan;
1288                 num_different_channels++;
1289                 break;
1290         case CHAN_MODE_EXCLUSIVE:
1291                 num_different_channels++;
1292                 break;
1293         }
1294
1295         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1296                 if (wdev_iter == wdev)
1297                         continue;
1298                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1299                         if (!wdev_iter->p2p_started)
1300                                 continue;
1301                 } else if (wdev_iter->netdev) {
1302                         if (!netif_running(wdev_iter->netdev))
1303                                 continue;
1304                 } else {
1305                         WARN_ON(1);
1306                 }
1307
1308                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1309                         continue;
1310
1311                 /*
1312                  * We may be holding the "wdev" mutex, but now need to lock
1313                  * wdev_iter. This is OK because once we get here wdev_iter
1314                  * is not wdev (tested above), but we need to use the nested
1315                  * locking for lockdep.
1316                  */
1317                 mutex_lock_nested(&wdev_iter->mtx, 1);
1318                 __acquire(wdev_iter->mtx);
1319                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1320                 wdev_unlock(wdev_iter);
1321
1322                 switch (chmode) {
1323                 case CHAN_MODE_UNDEFINED:
1324                         break;
1325                 case CHAN_MODE_SHARED:
1326                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1327                                 if (!used_channels[i] || used_channels[i] == ch)
1328                                         break;
1329
1330                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1331                                 return -EBUSY;
1332
1333                         if (used_channels[i] == NULL) {
1334                                 used_channels[i] = ch;
1335                                 num_different_channels++;
1336                         }
1337                         break;
1338                 case CHAN_MODE_EXCLUSIVE:
1339                         num_different_channels++;
1340                         break;
1341                 }
1342
1343                 num[wdev_iter->iftype]++;
1344                 total++;
1345                 used_iftypes |= BIT(wdev_iter->iftype);
1346         }
1347
1348         if (total == 1 && !radar_detect)
1349                 return 0;
1350
1351         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1352                 const struct ieee80211_iface_combination *c;
1353                 struct ieee80211_iface_limit *limits;
1354                 u32 all_iftypes = 0;
1355
1356                 c = &rdev->wiphy.iface_combinations[i];
1357
1358                 if (total > c->max_interfaces)
1359                         continue;
1360                 if (num_different_channels > c->num_different_channels)
1361                         continue;
1362
1363                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1364                                  GFP_KERNEL);
1365                 if (!limits)
1366                         return -ENOMEM;
1367
1368                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1369                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1370                                 continue;
1371                         for (j = 0; j < c->n_limits; j++) {
1372                                 all_iftypes |= limits[j].types;
1373                                 if (!(limits[j].types & BIT(iftype)))
1374                                         continue;
1375                                 if (limits[j].max < num[iftype])
1376                                         goto cont;
1377                                 limits[j].max -= num[iftype];
1378                         }
1379                 }
1380
1381                 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1382                         goto cont;
1383
1384                 /*
1385                  * Finally check that all iftypes that we're currently
1386                  * using are actually part of this combination. If they
1387                  * aren't then we can't use this combination and have
1388                  * to continue to the next.
1389                  */
1390                 if ((all_iftypes & used_iftypes) != used_iftypes)
1391                         goto cont;
1392
1393                 /*
1394                  * This combination covered all interface types and
1395                  * supported the requested numbers, so we're good.
1396                  */
1397                 kfree(limits);
1398                 return 0;
1399  cont:
1400                 kfree(limits);
1401         }
1402
1403         return -EBUSY;
1404 }
1405
1406 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1407                            const u8 *rates, unsigned int n_rates,
1408                            u32 *mask)
1409 {
1410         int i, j;
1411
1412         if (!sband)
1413                 return -EINVAL;
1414
1415         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1416                 return -EINVAL;
1417
1418         *mask = 0;
1419
1420         for (i = 0; i < n_rates; i++) {
1421                 int rate = (rates[i] & 0x7f) * 5;
1422                 bool found = false;
1423
1424                 for (j = 0; j < sband->n_bitrates; j++) {
1425                         if (sband->bitrates[j].bitrate == rate) {
1426                                 found = true;
1427                                 *mask |= BIT(j);
1428                                 break;
1429                         }
1430                 }
1431                 if (!found)
1432                         return -EINVAL;
1433         }
1434
1435         /*
1436          * mask must have at least one bit set here since we
1437          * didn't accept a 0-length rates array nor allowed
1438          * entries in the array that didn't exist
1439          */
1440
1441         return 0;
1442 }
1443
1444 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1445 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1446 const unsigned char rfc1042_header[] __aligned(2) =
1447         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1448 EXPORT_SYMBOL(rfc1042_header);
1449
1450 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1451 const unsigned char bridge_tunnel_header[] __aligned(2) =
1452         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1453 EXPORT_SYMBOL(bridge_tunnel_header);