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