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 <linux/if_vlan.h>
  14 #include "core.h"
  15 #include "rdev-ops.h"
  16
  17
  18 struct ieee80211_rate *
  19 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  20                             u32 basic_rates, int bitrate)
  21 {
  22         struct ieee80211_rate *result = &sband->bitrates[0];
  23         int i;
  24
  25         for (i = 0; i < sband->n_bitrates; i++) {
  26                 if (!(basic_rates & BIT(i)))
  27                         continue;
  28                 if (sband->bitrates[i].bitrate > bitrate)
  29                         continue;
  30                 result = &sband->bitrates[i];
  31         }
  32
  33         return result;
  34 }
  35 EXPORT_SYMBOL(ieee80211_get_response_rate);
  36
  37 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  38                               enum nl80211_bss_scan_width scan_width)
  39 {
  40         struct ieee80211_rate *bitrates;
  41         u32 mandatory_rates = 0;
  42         enum ieee80211_rate_flags mandatory_flag;
  43         int i;
  44
  45         if (WARN_ON(!sband))
  46                 return 1;
  47
  48         if (sband->band == IEEE80211_BAND_2GHZ) {
  49                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  50                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  51                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  52                 else
  53                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  54         } else {
  55                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  56         }
  57
  58         bitrates = sband->bitrates;
  59         for (i = 0; i < sband->n_bitrates; i++)
  60                 if (bitrates[i].flags & mandatory_flag)
  61                         mandatory_rates |= BIT(i);
  62         return mandatory_rates;
  63 }
  64 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  65
  66 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  67 {
  68         /* see 802.11 17.3.8.3.2 and Annex J
  69          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  70         if (chan <= 0)
  71                 return 0; /* not supported */
  72         switch (band) {
  73         case IEEE80211_BAND_2GHZ:
  74                 if (chan == 14)
  75                         return 2484;
  76                 else if (chan < 14)
  77                         return 2407 + chan * 5;
  78                 break;
  79         case IEEE80211_BAND_5GHZ:
  80                 if (chan >= 182 && chan <= 196)
  81                         return 4000 + chan * 5;
  82                 else
  83                         return 5000 + chan * 5;
  84                 break;
  85         case IEEE80211_BAND_60GHZ:
  86                 if (chan < 5)
  87                         return 56160 + chan * 2160;
  88                 break;
  89         default:
  90                 ;
  91         }
  92         return 0; /* not supported */
  93 }
  94 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  95
  96 int ieee80211_frequency_to_channel(int freq)
  97 {
  98         /* see 802.11 17.3.8.3.2 and Annex J */
  99         if (freq == 2484)
 100                 return 14;
 101         else if (freq < 2484)
 102                 return (freq - 2407) / 5;
 103         else if (freq >= 4910 && freq <= 4980)
 104                 return (freq - 4000) / 5;
 105         else if (freq <= 45000) /* DMG band lower limit */
 106                 return (freq - 5000) / 5;
 107         else if (freq >= 58320 && freq <= 64800)
 108                 return (freq - 56160) / 2160;
 109         else
 110                 return 0;
 111 }
 112 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 113
 114 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 115                                                   int freq)
 116 {
 117         enum ieee80211_band band;
 118         struct ieee80211_supported_band *sband;
 119         int i;
 120
 121         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 122                 sband = wiphy->bands[band];
 123
 124                 if (!sband)
 125                         continue;
 126
 127                 for (i = 0; i < sband->n_channels; i++) {
 128                         if (sband->channels[i].center_freq == freq)
 129                                 return &sband->channels[i];
 130                 }
 131         }
 132
 133         return NULL;
 134 }
 135 EXPORT_SYMBOL(__ieee80211_get_channel);
 136
 137 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 138                                      enum ieee80211_band band)
 139 {
 140         int i, want;
 141
 142         switch (band) {
 143         case IEEE80211_BAND_5GHZ:
 144                 want = 3;
 145                 for (i = 0; i < sband->n_bitrates; i++) {
 146                         if (sband->bitrates[i].bitrate == 60 ||
 147                             sband->bitrates[i].bitrate == 120 ||
 148                             sband->bitrates[i].bitrate == 240) {
 149                                 sband->bitrates[i].flags |=
 150                                         IEEE80211_RATE_MANDATORY_A;
 151                                 want--;
 152                         }
 153                 }
 154                 WARN_ON(want);
 155                 break;
 156         case IEEE80211_BAND_2GHZ:
 157                 want = 7;
 158                 for (i = 0; i < sband->n_bitrates; i++) {
 159                         if (sband->bitrates[i].bitrate == 10) {
 160                                 sband->bitrates[i].flags |=
 161                                         IEEE80211_RATE_MANDATORY_B |
 162                                         IEEE80211_RATE_MANDATORY_G;
 163                                 want--;
 164                         }
 165
 166                         if (sband->bitrates[i].bitrate == 20 ||
 167                             sband->bitrates[i].bitrate == 55 ||
 168                             sband->bitrates[i].bitrate == 110 ||
 169                             sband->bitrates[i].bitrate == 60 ||
 170                             sband->bitrates[i].bitrate == 120 ||
 171                             sband->bitrates[i].bitrate == 240) {
 172                                 sband->bitrates[i].flags |=
 173                                         IEEE80211_RATE_MANDATORY_G;
 174                                 want--;
 175                         }
 176
 177                         if (sband->bitrates[i].bitrate != 10 &&
 178                             sband->bitrates[i].bitrate != 20 &&
 179                             sband->bitrates[i].bitrate != 55 &&
 180                             sband->bitrates[i].bitrate != 110)
 181                                 sband->bitrates[i].flags |=
 182                                         IEEE80211_RATE_ERP_G;
 183                 }
 184                 WARN_ON(want != 0 && want != 3 && want != 6);
 185                 break;
 186         case IEEE80211_BAND_60GHZ:
 187                 /* check for mandatory HT MCS 1..4 */
 188                 WARN_ON(!sband->ht_cap.ht_supported);
 189                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 190                 break;
 191         case IEEE80211_NUM_BANDS:
 192                 WARN_ON(1);
 193                 break;
 194         }
 195 }
 196
 197 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 198 {
 199         enum ieee80211_band band;
 200
 201         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 202                 if (wiphy->bands[band])
 203                         set_mandatory_flags_band(wiphy->bands[band], band);
 204 }
 205
 206 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 207 {
 208         int i;
 209         for (i = 0; i < wiphy->n_cipher_suites; i++)
 210                 if (cipher == wiphy->cipher_suites[i])
 211                         return true;
 212         return false;
 213 }
 214
 215 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 216                                    struct key_params *params, int key_idx,
 217                                    bool pairwise, const u8 *mac_addr)
 218 {
 219         if (key_idx > 5)
 220                 return -EINVAL;
 221
 222         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 223                 return -EINVAL;
 224
 225         if (pairwise && !mac_addr)
 226                 return -EINVAL;
 227
 228         /*
 229          * Disallow pairwise keys with non-zero index unless it's WEP
 230          * or a vendor specific cipher (because current deployments use
 231          * pairwise WEP keys with non-zero indices and for vendor specific
 232          * ciphers this should be validated in the driver or hardware level
 233          * - but 802.11i clearly specifies to use zero)
 234          */
 235         if (pairwise && key_idx &&
 236             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 237              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 238              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 239                 return -EINVAL;
 240
 241         switch (params->cipher) {
 242         case WLAN_CIPHER_SUITE_WEP40:
 243                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 244                         return -EINVAL;
 245                 break;
 246         case WLAN_CIPHER_SUITE_TKIP:
 247                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 248                         return -EINVAL;
 249                 break;
 250         case WLAN_CIPHER_SUITE_CCMP:
 251                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 252                         return -EINVAL;
 253                 break;
 254         case WLAN_CIPHER_SUITE_WEP104:
 255                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 256                         return -EINVAL;
 257                 break;
 258         case WLAN_CIPHER_SUITE_AES_CMAC:
 259                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 260                         return -EINVAL;
 261                 break;
 262         default:
 263                 /*
 264                  * We don't know anything about this algorithm,
 265                  * allow using it -- but the driver must check
 266                  * all parameters! We still check below whether
 267                  * or not the driver supports this algorithm,
 268                  * of course.
 269                  */
 270                 break;
 271         }
 272
 273         if (params->seq) {
 274                 switch (params->cipher) {
 275                 case WLAN_CIPHER_SUITE_WEP40:
 276                 case WLAN_CIPHER_SUITE_WEP104:
 277                         /* These ciphers do not use key sequence */
 278                         return -EINVAL;
 279                 case WLAN_CIPHER_SUITE_TKIP:
 280                 case WLAN_CIPHER_SUITE_CCMP:
 281                 case WLAN_CIPHER_SUITE_AES_CMAC:
 282                         if (params->seq_len != 6)
 283                                 return -EINVAL;
 284                         break;
 285                 }
 286         }
 287
 288         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 289                 return -EINVAL;
 290
 291         return 0;
 292 }
 293
 294 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 295 {
 296         unsigned int hdrlen = 24;
 297
 298         if (ieee80211_is_data(fc)) {
 299                 if (ieee80211_has_a4(fc))
 300                         hdrlen = 30;
 301                 if (ieee80211_is_data_qos(fc)) {
 302                         hdrlen += IEEE80211_QOS_CTL_LEN;
 303                         if (ieee80211_has_order(fc))
 304                                 hdrlen += IEEE80211_HT_CTL_LEN;
 305                 }
 306                 goto out;
 307         }
 308
 309         if (ieee80211_is_ctl(fc)) {
 310                 /*
 311                  * ACK and CTS are 10 bytes, all others 16. To see how
 312                  * to get this condition consider
 313                  *   subtype mask:   0b0000000011110000 (0x00F0)
 314                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 315                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 316                  *   bits that matter:         ^^^      (0x00E0)
 317                  *   value of those: 0b0000000011000000 (0x00C0)
 318                  */
 319                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 320                         hdrlen = 10;
 321                 else
 322                         hdrlen = 16;
 323         }
 324 out:
 325         return hdrlen;
 326 }
 327 EXPORT_SYMBOL(ieee80211_hdrlen);
 328
 329 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 330 {
 331         const struct ieee80211_hdr *hdr =
 332                         (const struct ieee80211_hdr *)skb->data;
 333         unsigned int hdrlen;
 334
 335         if (unlikely(skb->len < 10))
 336                 return 0;
 337         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 338         if (unlikely(hdrlen > skb->len))
 339                 return 0;
 340         return hdrlen;
 341 }
 342 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 343
 344 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 345 {
 346         int ae = meshhdr->flags & MESH_FLAGS_AE;
 347         /* 802.11-2012, 8.2.4.7.3 */
 348         switch (ae) {
 349         default:
 350         case 0:
 351                 return 6;
 352         case MESH_FLAGS_AE_A4:
 353                 return 12;
 354         case MESH_FLAGS_AE_A5_A6:
 355                 return 18;
 356         }
 357 }
 358 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 359
 360 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 361                            enum nl80211_iftype iftype)
 362 {
 363         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 364         u16 hdrlen, ethertype;
 365         u8 *payload;
 366         u8 dst[ETH_ALEN];
 367         u8 src[ETH_ALEN] __aligned(2);
 368
 369         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 370                 return -1;
 371
 372         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 373
 374         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 375          * header
 376          * IEEE 802.11 address fields:
 377          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 378          *   0     0   DA    SA    BSSID n/a
 379          *   0     1   DA    BSSID SA    n/a
 380          *   1     0   BSSID SA    DA    n/a
 381          *   1     1   RA    TA    DA    SA
 382          */
 383         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 384         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 385
 386         switch (hdr->frame_control &
 387                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 388         case cpu_to_le16(IEEE80211_FCTL_TODS):
 389                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 390                              iftype != NL80211_IFTYPE_AP_VLAN &&
 391                              iftype != NL80211_IFTYPE_P2P_GO))
 392                         return -1;
 393                 break;
 394         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 395                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 396                              iftype != NL80211_IFTYPE_MESH_POINT &&
 397                              iftype != NL80211_IFTYPE_AP_VLAN &&
 398                              iftype != NL80211_IFTYPE_STATION))
 399                         return -1;
 400                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 401                         struct ieee80211s_hdr *meshdr =
 402                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 403                         /* make sure meshdr->flags is on the linear part */
 404                         if (!pskb_may_pull(skb, hdrlen + 1))
 405                                 return -1;
 406                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 407                                 return -1;
 408                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 409                                 skb_copy_bits(skb, hdrlen +
 410                                         offsetof(struct ieee80211s_hdr, eaddr1),
 411                                         dst, ETH_ALEN);
 412                                 skb_copy_bits(skb, hdrlen +
 413                                         offsetof(struct ieee80211s_hdr, eaddr2),
 414                                         src, ETH_ALEN);
 415                         }
 416                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 417                 }
 418                 break;
 419         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 420                 if ((iftype != NL80211_IFTYPE_STATION &&
 421                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 422                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 423                     (is_multicast_ether_addr(dst) &&
 424                      ether_addr_equal(src, addr)))
 425                         return -1;
 426                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 427                         struct ieee80211s_hdr *meshdr =
 428                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 429                         /* make sure meshdr->flags is on the linear part */
 430                         if (!pskb_may_pull(skb, hdrlen + 1))
 431                                 return -1;
 432                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 433                                 return -1;
 434                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 435                                 skb_copy_bits(skb, hdrlen +
 436                                         offsetof(struct ieee80211s_hdr, eaddr1),
 437                                         src, ETH_ALEN);
 438                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 439                 }
 440                 break;
 441         case cpu_to_le16(0):
 442                 if (iftype != NL80211_IFTYPE_ADHOC &&
 443                     iftype != NL80211_IFTYPE_STATION)
 444                                 return -1;
 445                 break;
 446         }
 447
 448         if (!pskb_may_pull(skb, hdrlen + 8))
 449                 return -1;
 450
 451         payload = skb->data + hdrlen;
 452         ethertype = (payload[6] << 8) | payload[7];
 453
 454         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 455                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 456                    ether_addr_equal(payload, bridge_tunnel_header))) {
 457                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 458                  * replace EtherType */
 459                 skb_pull(skb, hdrlen + 6);
 460                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 461                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 462         } else {
 463                 struct ethhdr *ehdr;
 464                 __be16 len;
 465
 466                 skb_pull(skb, hdrlen);
 467                 len = htons(skb->len);
 468                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 469                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 470                 memcpy(ehdr->h_source, src, ETH_ALEN);
 471                 ehdr->h_proto = len;
 472         }
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(ieee80211_data_to_8023);
 476
 477 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 478                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 479 {
 480         struct ieee80211_hdr hdr;
 481         u16 hdrlen, ethertype;
 482         __le16 fc;
 483         const u8 *encaps_data;
 484         int encaps_len, skip_header_bytes;
 485         int nh_pos, h_pos;
 486         int head_need;
 487
 488         if (unlikely(skb->len < ETH_HLEN))
 489                 return -EINVAL;
 490
 491         nh_pos = skb_network_header(skb) - skb->data;
 492         h_pos = skb_transport_header(skb) - skb->data;
 493
 494         /* convert Ethernet header to proper 802.11 header (based on
 495          * operation mode) */
 496         ethertype = (skb->data[12] << 8) | skb->data[13];
 497         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 498
 499         switch (iftype) {
 500         case NL80211_IFTYPE_AP:
 501         case NL80211_IFTYPE_AP_VLAN:
 502         case NL80211_IFTYPE_P2P_GO:
 503                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 504                 /* DA BSSID SA */
 505                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 506                 memcpy(hdr.addr2, addr, ETH_ALEN);
 507                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 508                 hdrlen = 24;
 509                 break;
 510         case NL80211_IFTYPE_STATION:
 511         case NL80211_IFTYPE_P2P_CLIENT:
 512                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 513                 /* BSSID SA DA */
 514                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 515                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 516                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 517                 hdrlen = 24;
 518                 break;
 519         case NL80211_IFTYPE_ADHOC:
 520                 /* DA SA BSSID */
 521                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 522                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 523                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 524                 hdrlen = 24;
 525                 break;
 526         default:
 527                 return -EOPNOTSUPP;
 528         }
 529
 530         if (qos) {
 531                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 532                 hdrlen += 2;
 533         }
 534
 535         hdr.frame_control = fc;
 536         hdr.duration_id = 0;
 537         hdr.seq_ctrl = 0;
 538
 539         skip_header_bytes = ETH_HLEN;
 540         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 541                 encaps_data = bridge_tunnel_header;
 542                 encaps_len = sizeof(bridge_tunnel_header);
 543                 skip_header_bytes -= 2;
 544         } else if (ethertype >= ETH_P_802_3_MIN) {
 545                 encaps_data = rfc1042_header;
 546                 encaps_len = sizeof(rfc1042_header);
 547                 skip_header_bytes -= 2;
 548         } else {
 549                 encaps_data = NULL;
 550                 encaps_len = 0;
 551         }
 552
 553         skb_pull(skb, skip_header_bytes);
 554         nh_pos -= skip_header_bytes;
 555         h_pos -= skip_header_bytes;
 556
 557         head_need = hdrlen + encaps_len - skb_headroom(skb);
 558
 559         if (head_need > 0 || skb_cloned(skb)) {
 560                 head_need = max(head_need, 0);
 561                 if (head_need)
 562                         skb_orphan(skb);
 563
 564                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 565                         return -ENOMEM;
 566
 567                 skb->truesize += head_need;
 568         }
 569
 570         if (encaps_data) {
 571                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 572                 nh_pos += encaps_len;
 573                 h_pos += encaps_len;
 574         }
 575
 576         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 577
 578         nh_pos += hdrlen;
 579         h_pos += hdrlen;
 580
 581         /* Update skb pointers to various headers since this modified frame
 582          * is going to go through Linux networking code that may potentially
 583          * need things like pointer to IP header. */
 584         skb_set_mac_header(skb, 0);
 585         skb_set_network_header(skb, nh_pos);
 586         skb_set_transport_header(skb, h_pos);
 587
 588         return 0;
 589 }
 590 EXPORT_SYMBOL(ieee80211_data_from_8023);
 591
 592
 593 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 594                               const u8 *addr, enum nl80211_iftype iftype,
 595                               const unsigned int extra_headroom,
 596                               bool has_80211_header)
 597 {
 598         struct sk_buff *frame = NULL;
 599         u16 ethertype;
 600         u8 *payload;
 601         const struct ethhdr *eth;
 602         int remaining, err;
 603         u8 dst[ETH_ALEN], src[ETH_ALEN];
 604
 605         if (has_80211_header) {
 606                 err = ieee80211_data_to_8023(skb, addr, iftype);
 607                 if (err)
 608                         goto out;
 609
 610                 /* skip the wrapping header */
 611                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 612                 if (!eth)
 613                         goto out;
 614         } else {
 615                 eth = (struct ethhdr *) skb->data;
 616         }
 617
 618         while (skb != frame) {
 619                 u8 padding;
 620                 __be16 len = eth->h_proto;
 621                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 622
 623                 remaining = skb->len;
 624                 memcpy(dst, eth->h_dest, ETH_ALEN);
 625                 memcpy(src, eth->h_source, ETH_ALEN);
 626
 627                 padding = (4 - subframe_len) & 0x3;
 628                 /* the last MSDU has no padding */
 629                 if (subframe_len > remaining)
 630                         goto purge;
 631
 632                 skb_pull(skb, sizeof(struct ethhdr));
 633                 /* reuse skb for the last subframe */
 634                 if (remaining <= subframe_len + padding)
 635                         frame = skb;
 636                 else {
 637                         unsigned int hlen = ALIGN(extra_headroom, 4);
 638                         /*
 639                          * Allocate and reserve two bytes more for payload
 640                          * alignment since sizeof(struct ethhdr) is 14.
 641                          */
 642                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 643                         if (!frame)
 644                                 goto purge;
 645
 646                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 647                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 648                                 ntohs(len));
 649
 650                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 651                                                         padding);
 652                         if (!eth) {
 653                                 dev_kfree_skb(frame);
 654                                 goto purge;
 655                         }
 656                 }
 657
 658                 skb_reset_network_header(frame);
 659                 frame->dev = skb->dev;
 660                 frame->priority = skb->priority;
 661
 662                 payload = frame->data;
 663                 ethertype = (payload[6] << 8) | payload[7];
 664
 665                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 666                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 667                            ether_addr_equal(payload, bridge_tunnel_header))) {
 668                         /* remove RFC1042 or Bridge-Tunnel
 669                          * encapsulation and replace EtherType */
 670                         skb_pull(frame, 6);
 671                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 672                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 673                 } else {
 674                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 675                                 sizeof(__be16));
 676                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 677                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 678                 }
 679                 __skb_queue_tail(list, frame);
 680         }
 681
 682         return;
 683
 684  purge:
 685         __skb_queue_purge(list);
 686  out:
 687         dev_kfree_skb(skb);
 688 }
 689 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 690
 691 /* Given a data frame determine the 802.1p/1d tag to use. */
 692 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 693 {
 694         unsigned int dscp;
 695         unsigned char vlan_priority;
 696
 697         /* skb->priority values from 256->263 are magic values to
 698          * directly indicate a specific 802.1d priority.  This is used
 699          * to allow 802.1d priority to be passed directly in from VLAN
 700          * tags, etc.
 701          */
 702         if (skb->priority >= 256 && skb->priority <= 263)
 703                 return skb->priority - 256;
 704
 705         if (vlan_tx_tag_present(skb)) {
 706                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
 707                         >> VLAN_PRIO_SHIFT;
 708                 if (vlan_priority > 0)
 709                         return vlan_priority;
 710         }
 711
 712         switch (skb->protocol) {
 713         case htons(ETH_P_IP):
 714                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 715                 break;
 716         case htons(ETH_P_IPV6):
 717                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 718                 break;
 719         default:
 720                 return 0;
 721         }
 722
 723         return dscp >> 5;
 724 }
 725 EXPORT_SYMBOL(cfg80211_classify8021d);
 726
 727 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 728 {
 729         const struct cfg80211_bss_ies *ies;
 730
 731         ies = rcu_dereference(bss->ies);
 732         if (!ies)
 733                 return NULL;
 734
 735         return cfg80211_find_ie(ie, ies->data, ies->len);
 736 }
 737 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 738
 739 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 740 {
 741         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 742         struct net_device *dev = wdev->netdev;
 743         int i;
 744
 745         if (!wdev->connect_keys)
 746                 return;
 747
 748         for (i = 0; i < 6; i++) {
 749                 if (!wdev->connect_keys->params[i].cipher)
 750                         continue;
 751                 if (rdev_add_key(rdev, dev, i, false, NULL,
 752                                  &wdev->connect_keys->params[i])) {
 753                         netdev_err(dev, "failed to set key %d\n", i);
 754                         continue;
 755                 }
 756                 if (wdev->connect_keys->def == i)
 757                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 758                                 netdev_err(dev, "failed to set defkey %d\n", i);
 759                                 continue;
 760                         }
 761                 if (wdev->connect_keys->defmgmt == i)
 762                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 763                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 764         }
 765
 766         kfree(wdev->connect_keys);
 767         wdev->connect_keys = NULL;
 768 }
 769
 770 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 771 {
 772         struct cfg80211_event *ev;
 773         unsigned long flags;
 774         const u8 *bssid = NULL;
 775
 776         spin_lock_irqsave(&wdev->event_lock, flags);
 777         while (!list_empty(&wdev->event_list)) {
 778                 ev = list_first_entry(&wdev->event_list,
 779                                       struct cfg80211_event, list);
 780                 list_del(&ev->list);
 781                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 782
 783                 wdev_lock(wdev);
 784                 switch (ev->type) {
 785                 case EVENT_CONNECT_RESULT:
 786                         if (!is_zero_ether_addr(ev->cr.bssid))
 787                                 bssid = ev->cr.bssid;
 788                         __cfg80211_connect_result(
 789                                 wdev->netdev, bssid,
 790                                 ev->cr.req_ie, ev->cr.req_ie_len,
 791                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 792                                 ev->cr.status,
 793                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 794                                 NULL);
 795                         break;
 796                 case EVENT_ROAMED:
 797                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 798                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 799                                           ev->rm.resp_ie_len);
 800                         break;
 801                 case EVENT_DISCONNECTED:
 802                         __cfg80211_disconnected(wdev->netdev,
 803                                                 ev->dc.ie, ev->dc.ie_len,
 804                                                 ev->dc.reason, true);
 805                         break;
 806                 case EVENT_IBSS_JOINED:
 807                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 808                         break;
 809                 }
 810                 wdev_unlock(wdev);
 811
 812                 kfree(ev);
 813
 814                 spin_lock_irqsave(&wdev->event_lock, flags);
 815         }
 816         spin_unlock_irqrestore(&wdev->event_lock, flags);
 817 }
 818
 819 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 820 {
 821         struct wireless_dev *wdev;
 822
 823         ASSERT_RTNL();
 824         ASSERT_RDEV_LOCK(rdev);
 825
 826         list_for_each_entry(wdev, &rdev->wdev_list, list)
 827                 cfg80211_process_wdev_events(wdev);
 828 }
 829
 830 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 831                           struct net_device *dev, enum nl80211_iftype ntype,
 832                           u32 *flags, struct vif_params *params)
 833 {
 834         int err;
 835         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 836
 837         ASSERT_RDEV_LOCK(rdev);
 838
 839         /* don't support changing VLANs, you just re-create them */
 840         if (otype == NL80211_IFTYPE_AP_VLAN)
 841                 return -EOPNOTSUPP;
 842
 843         /* cannot change into P2P device type */
 844         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 845                 return -EOPNOTSUPP;
 846
 847         if (!rdev->ops->change_virtual_intf ||
 848             !(rdev->wiphy.interface_modes & (1 << ntype)))
 849                 return -EOPNOTSUPP;
 850
 851         /* if it's part of a bridge, reject changing type to station/ibss */
 852         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 853             (ntype == NL80211_IFTYPE_ADHOC ||
 854              ntype == NL80211_IFTYPE_STATION ||
 855              ntype == NL80211_IFTYPE_P2P_CLIENT))
 856                 return -EBUSY;
 857
 858         if (ntype != otype && netif_running(dev)) {
 859                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 860                                                     ntype);
 861                 if (err)
 862                         return err;
 863
 864                 dev->ieee80211_ptr->use_4addr = false;
 865                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 866
 867                 switch (otype) {
 868                 case NL80211_IFTYPE_AP:
 869                         cfg80211_stop_ap(rdev, dev);
 870                         break;
 871                 case NL80211_IFTYPE_ADHOC:
 872                         cfg80211_leave_ibss(rdev, dev, false);
 873                         break;
 874                 case NL80211_IFTYPE_STATION:
 875                 case NL80211_IFTYPE_P2P_CLIENT:
 876                         wdev_lock(dev->ieee80211_ptr);
 877                         cfg80211_disconnect(rdev, dev,
 878                                             WLAN_REASON_DEAUTH_LEAVING, true);
 879                         wdev_unlock(dev->ieee80211_ptr);
 880                         break;
 881                 case NL80211_IFTYPE_MESH_POINT:
 882                         /* mesh should be handled? */
 883                         break;
 884                 default:
 885                         break;
 886                 }
 887
 888                 cfg80211_process_rdev_events(rdev);
 889         }
 890
 891         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 892
 893         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 894
 895         if (!err && params && params->use_4addr != -1)
 896                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 897
 898         if (!err) {
 899                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 900                 switch (ntype) {
 901                 case NL80211_IFTYPE_STATION:
 902                         if (dev->ieee80211_ptr->use_4addr)
 903                                 break;
 904                         /* fall through */
 905                 case NL80211_IFTYPE_P2P_CLIENT:
 906                 case NL80211_IFTYPE_ADHOC:
 907                         dev->priv_flags |= IFF_DONT_BRIDGE;
 908                         break;
 909                 case NL80211_IFTYPE_P2P_GO:
 910                 case NL80211_IFTYPE_AP:
 911                 case NL80211_IFTYPE_AP_VLAN:
 912                 case NL80211_IFTYPE_WDS:
 913                 case NL80211_IFTYPE_MESH_POINT:
 914                         /* bridging OK */
 915                         break;
 916                 case NL80211_IFTYPE_MONITOR:
 917                         /* monitor can't bridge anyway */
 918                         break;
 919                 case NL80211_IFTYPE_UNSPECIFIED:
 920                 case NUM_NL80211_IFTYPES:
 921                         /* not happening */
 922                         break;
 923                 case NL80211_IFTYPE_P2P_DEVICE:
 924                         WARN_ON(1);
 925                         break;
 926                 }
 927         }
 928
 929         if (!err && ntype != otype && netif_running(dev)) {
 930                 cfg80211_update_iface_num(rdev, ntype, 1);
 931                 cfg80211_update_iface_num(rdev, otype, -1);
 932         }
 933
 934         return err;
 935 }
 936
 937 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 938 {
 939         static const u32 __mcs2bitrate[] = {
 940                 /* control PHY */
 941                 [0] =   275,
 942                 /* SC PHY */
 943                 [1] =  3850,
 944                 [2] =  7700,
 945                 [3] =  9625,
 946                 [4] = 11550,
 947                 [5] = 12512, /* 1251.25 mbps */
 948                 [6] = 15400,
 949                 [7] = 19250,
 950                 [8] = 23100,
 951                 [9] = 25025,
 952                 [10] = 30800,
 953                 [11] = 38500,
 954                 [12] = 46200,
 955                 /* OFDM PHY */
 956                 [13] =  6930,
 957                 [14] =  8662, /* 866.25 mbps */
 958                 [15] = 13860,
 959                 [16] = 17325,
 960                 [17] = 20790,
 961                 [18] = 27720,
 962                 [19] = 34650,
 963                 [20] = 41580,
 964                 [21] = 45045,
 965                 [22] = 51975,
 966                 [23] = 62370,
 967                 [24] = 67568, /* 6756.75 mbps */
 968                 /* LP-SC PHY */
 969                 [25] =  6260,
 970                 [26] =  8340,
 971                 [27] = 11120,
 972                 [28] = 12510,
 973                 [29] = 16680,
 974                 [30] = 22240,
 975                 [31] = 25030,
 976         };
 977
 978         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
 979                 return 0;
 980
 981         return __mcs2bitrate[rate->mcs];
 982 }
 983
 984 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
 985 {
 986         static const u32 base[4][10] = {
 987                 {   6500000,
 988                    13000000,
 989                    19500000,
 990                    26000000,
 991                    39000000,
 992                    52000000,
 993                    58500000,
 994                    65000000,
 995                    78000000,
 996                    0,
 997                 },
 998                 {  13500000,
 999                    27000000,
1000                    40500000,
1001                    54000000,
1002                    81000000,
1003                   108000000,
1004                   121500000,
1005                   135000000,
1006                   162000000,
1007                   180000000,
1008                 },
1009                 {  29300000,
1010                    58500000,
1011                    87800000,
1012                   117000000,
1013                   175500000,
1014                   234000000,
1015                   263300000,
1016                   292500000,
1017                   351000000,
1018                   390000000,
1019                 },
1020                 {  58500000,
1021                   117000000,
1022                   175500000,
1023                   234000000,
1024                   351000000,
1025                   468000000,
1026                   526500000,
1027                   585000000,
1028                   702000000,
1029                   780000000,
1030                 },
1031         };
1032         u32 bitrate;
1033         int idx;
1034
1035         if (WARN_ON_ONCE(rate->mcs > 9))
1036                 return 0;
1037
1038         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1039                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1040                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1041                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1042
1043         bitrate = base[idx][rate->mcs];
1044         bitrate *= rate->nss;
1045
1046         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1047                 bitrate = (bitrate / 9) * 10;
1048
1049         /* do NOT round down here */
1050         return (bitrate + 50000) / 100000;
1051 }
1052
1053 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1054 {
1055         int modulation, streams, bitrate;
1056
1057         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1058             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1059                 return rate->legacy;
1060         if (rate->flags & RATE_INFO_FLAGS_60G)
1061                 return cfg80211_calculate_bitrate_60g(rate);
1062         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1063                 return cfg80211_calculate_bitrate_vht(rate);
1064
1065         /* the formula below does only work for MCS values smaller than 32 */
1066         if (WARN_ON_ONCE(rate->mcs >= 32))
1067                 return 0;
1068
1069         modulation = rate->mcs & 7;
1070         streams = (rate->mcs >> 3) + 1;
1071
1072         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1073                         13500000 : 6500000;
1074
1075         if (modulation < 4)
1076                 bitrate *= (modulation + 1);
1077         else if (modulation == 4)
1078                 bitrate *= (modulation + 2);
1079         else
1080                 bitrate *= (modulation + 3);
1081
1082         bitrate *= streams;
1083
1084         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1085                 bitrate = (bitrate / 9) * 10;
1086
1087         /* do NOT round down here */
1088         return (bitrate + 50000) / 100000;
1089 }
1090 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1091
1092 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1093                           enum ieee80211_p2p_attr_id attr,
1094                           u8 *buf, unsigned int bufsize)
1095 {
1096         u8 *out = buf;
1097         u16 attr_remaining = 0;
1098         bool desired_attr = false;
1099         u16 desired_len = 0;
1100
1101         while (len > 0) {
1102                 unsigned int iedatalen;
1103                 unsigned int copy;
1104                 const u8 *iedata;
1105
1106                 if (len < 2)
1107                         return -EILSEQ;
1108                 iedatalen = ies[1];
1109                 if (iedatalen + 2 > len)
1110                         return -EILSEQ;
1111
1112                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1113                         goto cont;
1114
1115                 if (iedatalen < 4)
1116                         goto cont;
1117
1118                 iedata = ies + 2;
1119
1120                 /* check WFA OUI, P2P subtype */
1121                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1122                     iedata[2] != 0x9a || iedata[3] != 0x09)
1123                         goto cont;
1124
1125                 iedatalen -= 4;
1126                 iedata += 4;
1127
1128                 /* check attribute continuation into this IE */
1129                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1130                 if (copy && desired_attr) {
1131                         desired_len += copy;
1132                         if (out) {
1133                                 memcpy(out, iedata, min(bufsize, copy));
1134                                 out += min(bufsize, copy);
1135                                 bufsize -= min(bufsize, copy);
1136                         }
1137
1138
1139                         if (copy == attr_remaining)
1140                                 return desired_len;
1141                 }
1142
1143                 attr_remaining -= copy;
1144                 if (attr_remaining)
1145                         goto cont;
1146
1147                 iedatalen -= copy;
1148                 iedata += copy;
1149
1150                 while (iedatalen > 0) {
1151                         u16 attr_len;
1152
1153                         /* P2P attribute ID & size must fit */
1154                         if (iedatalen < 3)
1155                                 return -EILSEQ;
1156                         desired_attr = iedata[0] == attr;
1157                         attr_len = get_unaligned_le16(iedata + 1);
1158                         iedatalen -= 3;
1159                         iedata += 3;
1160
1161                         copy = min_t(unsigned int, attr_len, iedatalen);
1162
1163                         if (desired_attr) {
1164                                 desired_len += copy;
1165                                 if (out) {
1166                                         memcpy(out, iedata, min(bufsize, copy));
1167                                         out += min(bufsize, copy);
1168                                         bufsize -= min(bufsize, copy);
1169                                 }
1170
1171                                 if (copy == attr_len)
1172                                         return desired_len;
1173                         }
1174
1175                         iedata += copy;
1176                         iedatalen -= copy;
1177                         attr_remaining = attr_len - copy;
1178                 }
1179
1180  cont:
1181                 len -= ies[1] + 2;
1182                 ies += ies[1] + 2;
1183         }
1184
1185         if (attr_remaining && desired_attr)
1186                 return -EILSEQ;
1187
1188         return -ENOENT;
1189 }
1190 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1191
1192 bool ieee80211_operating_class_to_band(u8 operating_class,
1193                                        enum ieee80211_band *band)
1194 {
1195         switch (operating_class) {
1196         case 112:
1197         case 115 ... 127:
1198                 *band = IEEE80211_BAND_5GHZ;
1199                 return true;
1200         case 81:
1201         case 82:
1202         case 83:
1203         case 84:
1204                 *band = IEEE80211_BAND_2GHZ;
1205                 return true;
1206         case 180:
1207                 *band = IEEE80211_BAND_60GHZ;
1208                 return true;
1209         }
1210
1211         return false;
1212 }
1213 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1214
1215 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1216                                  u32 beacon_int)
1217 {
1218         struct wireless_dev *wdev;
1219         int res = 0;
1220
1221         if (!beacon_int)
1222                 return -EINVAL;
1223
1224         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1225                 if (!wdev->beacon_interval)
1226                         continue;
1227                 if (wdev->beacon_interval != beacon_int) {
1228                         res = -EINVAL;
1229                         break;
1230                 }
1231         }
1232
1233         return res;
1234 }
1235
1236 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1237                                  struct wireless_dev *wdev,
1238                                  enum nl80211_iftype iftype,
1239                                  struct ieee80211_channel *chan,
1240                                  enum cfg80211_chan_mode chanmode,
1241                                  u8 radar_detect)
1242 {
1243         struct wireless_dev *wdev_iter;
1244         u32 used_iftypes = BIT(iftype);
1245         int num[NUM_NL80211_IFTYPES];
1246         struct ieee80211_channel
1247                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1248         struct ieee80211_channel *ch;
1249         enum cfg80211_chan_mode chmode;
1250         int num_different_channels = 0;
1251         int total = 1;
1252         bool radar_required;
1253         int i, j;
1254
1255         ASSERT_RTNL();
1256
1257         if (WARN_ON(hweight32(radar_detect) > 1))
1258                 return -EINVAL;
1259
1260         switch (iftype) {
1261         case NL80211_IFTYPE_ADHOC:
1262         case NL80211_IFTYPE_AP:
1263         case NL80211_IFTYPE_AP_VLAN:
1264         case NL80211_IFTYPE_MESH_POINT:
1265         case NL80211_IFTYPE_P2P_GO:
1266         case NL80211_IFTYPE_WDS:
1267                 radar_required = !!(chan &&
1268                                     (chan->flags & IEEE80211_CHAN_RADAR));
1269                 break;
1270         case NL80211_IFTYPE_P2P_CLIENT:
1271         case NL80211_IFTYPE_STATION:
1272         case NL80211_IFTYPE_P2P_DEVICE:
1273         case NL80211_IFTYPE_MONITOR:
1274                 radar_required = false;
1275                 break;
1276         case NUM_NL80211_IFTYPES:
1277         case NL80211_IFTYPE_UNSPECIFIED:
1278         default:
1279                 return -EINVAL;
1280         }
1281
1282         if (radar_required && !radar_detect)
1283                 return -EINVAL;
1284
1285         /* Always allow software iftypes */
1286         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1287                 if (radar_detect)
1288                         return -EINVAL;
1289                 return 0;
1290         }
1291
1292         memset(num, 0, sizeof(num));
1293         memset(used_channels, 0, sizeof(used_channels));
1294
1295         num[iftype] = 1;
1296
1297         switch (chanmode) {
1298         case CHAN_MODE_UNDEFINED:
1299                 break;
1300         case CHAN_MODE_SHARED:
1301                 WARN_ON(!chan);
1302                 used_channels[0] = chan;
1303                 num_different_channels++;
1304                 break;
1305         case CHAN_MODE_EXCLUSIVE:
1306                 num_different_channels++;
1307                 break;
1308         }
1309
1310         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1311                 if (wdev_iter == wdev)
1312                         continue;
1313                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1314                         if (!wdev_iter->p2p_started)
1315                                 continue;
1316                 } else if (wdev_iter->netdev) {
1317                         if (!netif_running(wdev_iter->netdev))
1318                                 continue;
1319                 } else {
1320                         WARN_ON(1);
1321                 }
1322
1323                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1324                         continue;
1325
1326                 /*
1327                  * We may be holding the "wdev" mutex, but now need to lock
1328                  * wdev_iter. This is OK because once we get here wdev_iter
1329                  * is not wdev (tested above), but we need to use the nested
1330                  * locking for lockdep.
1331                  */
1332                 mutex_lock_nested(&wdev_iter->mtx, 1);
1333                 __acquire(wdev_iter->mtx);
1334                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1335                 wdev_unlock(wdev_iter);
1336
1337                 switch (chmode) {
1338                 case CHAN_MODE_UNDEFINED:
1339                         break;
1340                 case CHAN_MODE_SHARED:
1341                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1342                                 if (!used_channels[i] || used_channels[i] == ch)
1343                                         break;
1344
1345                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1346                                 return -EBUSY;
1347
1348                         if (used_channels[i] == NULL) {
1349                                 used_channels[i] = ch;
1350                                 num_different_channels++;
1351                         }
1352                         break;
1353                 case CHAN_MODE_EXCLUSIVE:
1354                         num_different_channels++;
1355                         break;
1356                 }
1357
1358                 num[wdev_iter->iftype]++;
1359                 total++;
1360                 used_iftypes |= BIT(wdev_iter->iftype);
1361         }
1362
1363         if (total == 1 && !radar_detect)
1364                 return 0;
1365
1366         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1367                 const struct ieee80211_iface_combination *c;
1368                 struct ieee80211_iface_limit *limits;
1369                 u32 all_iftypes = 0;
1370
1371                 c = &rdev->wiphy.iface_combinations[i];
1372
1373                 if (total > c->max_interfaces)
1374                         continue;
1375                 if (num_different_channels > c->num_different_channels)
1376                         continue;
1377
1378                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1379                                  GFP_KERNEL);
1380                 if (!limits)
1381                         return -ENOMEM;
1382
1383                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1384                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1385                                 continue;
1386                         for (j = 0; j < c->n_limits; j++) {
1387                                 all_iftypes |= limits[j].types;
1388                                 if (!(limits[j].types & BIT(iftype)))
1389                                         continue;
1390                                 if (limits[j].max < num[iftype])
1391                                         goto cont;
1392                                 limits[j].max -= num[iftype];
1393                         }
1394                 }
1395
1396                 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1397                         goto cont;
1398
1399                 /*
1400                  * Finally check that all iftypes that we're currently
1401                  * using are actually part of this combination. If they
1402                  * aren't then we can't use this combination and have
1403                  * to continue to the next.
1404                  */
1405                 if ((all_iftypes & used_iftypes) != used_iftypes)
1406                         goto cont;
1407
1408                 /*
1409                  * This combination covered all interface types and
1410                  * supported the requested numbers, so we're good.
1411                  */
1412                 kfree(limits);
1413                 return 0;
1414  cont:
1415                 kfree(limits);
1416         }
1417
1418         return -EBUSY;
1419 }
1420
1421 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1422                            const u8 *rates, unsigned int n_rates,
1423                            u32 *mask)
1424 {
1425         int i, j;
1426
1427         if (!sband)
1428                 return -EINVAL;
1429
1430         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1431                 return -EINVAL;
1432
1433         *mask = 0;
1434
1435         for (i = 0; i < n_rates; i++) {
1436                 int rate = (rates[i] & 0x7f) * 5;
1437                 bool found = false;
1438
1439                 for (j = 0; j < sband->n_bitrates; j++) {
1440                         if (sband->bitrates[j].bitrate == rate) {
1441                                 found = true;
1442                                 *mask |= BIT(j);
1443                                 break;
1444                         }
1445                 }
1446                 if (!found)
1447                         return -EINVAL;
1448         }
1449
1450         /*
1451          * mask must have at least one bit set here since we
1452          * didn't accept a 0-length rates array nor allowed
1453          * entries in the array that didn't exist
1454          */
1455
1456         return 0;
1457 }
1458
1459 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1460 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1461 const unsigned char rfc1042_header[] __aligned(2) =
1462         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1463 EXPORT_SYMBOL(rfc1042_header);
1464
1465 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1466 const unsigned char bridge_tunnel_header[] __aligned(2) =
1467         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1468 EXPORT_SYMBOL(bridge_tunnel_header);