net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/export.h>
   7 #include <linux/bitops.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/slab.h>
  10 #include <net/cfg80211.h>
  11 #include <net/ip.h>
  12 #include <net/dsfield.h>
  13 #include "core.h"
  14 #include "rdev-ops.h"
  15
  16
  17 struct ieee80211_rate *
  18 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  19                             u32 basic_rates, int bitrate)
  20 {
  21         struct ieee80211_rate *result = &sband->bitrates[0];
  22         int i;
  23
  24         for (i = 0; i < sband->n_bitrates; i++) {
  25                 if (!(basic_rates & BIT(i)))
  26                         continue;
  27                 if (sband->bitrates[i].bitrate > bitrate)
  28                         continue;
  29                 result = &sband->bitrates[i];
  30         }
  31
  32         return result;
  33 }
  34 EXPORT_SYMBOL(ieee80211_get_response_rate);
  35
  36 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  37                               enum nl80211_bss_scan_width scan_width)
  38 {
  39         struct ieee80211_rate *bitrates;
  40         u32 mandatory_rates = 0;
  41         enum ieee80211_rate_flags mandatory_flag;
  42         int i;
  43
  44         if (WARN_ON(!sband))
  45                 return 1;
  46
  47         if (sband->band == IEEE80211_BAND_2GHZ) {
  48                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  49                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  50                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  51                 else
  52                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  53         } else {
  54                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  55         }
  56
  57         bitrates = sband->bitrates;
  58         for (i = 0; i < sband->n_bitrates; i++)
  59                 if (bitrates[i].flags & mandatory_flag)
  60                         mandatory_rates |= BIT(i);
  61         return mandatory_rates;
  62 }
  63 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  64
  65 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  66 {
  67         /* see 802.11 17.3.8.3.2 and Annex J
  68          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  69         if (chan <= 0)
  70                 return 0; /* not supported */
  71         switch (band) {
  72         case IEEE80211_BAND_2GHZ:
  73                 if (chan == 14)
  74                         return 2484;
  75                 else if (chan < 14)
  76                         return 2407 + chan * 5;
  77                 break;
  78         case IEEE80211_BAND_5GHZ:
  79                 if (chan >= 182 && chan <= 196)
  80                         return 4000 + chan * 5;
  81                 else
  82                         return 5000 + chan * 5;
  83                 break;
  84         case IEEE80211_BAND_60GHZ:
  85                 if (chan < 5)
  86                         return 56160 + chan * 2160;
  87                 break;
  88         default:
  89                 ;
  90         }
  91         return 0; /* not supported */
  92 }
  93 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  94
  95 int ieee80211_frequency_to_channel(int freq)
  96 {
  97         /* see 802.11 17.3.8.3.2 and Annex J */
  98         if (freq == 2484)
  99                 return 14;
 100         else if (freq < 2484)
 101                 return (freq - 2407) / 5;
 102         else if (freq >= 4910 && freq <= 4980)
 103                 return (freq - 4000) / 5;
 104         else if (freq <= 45000) /* DMG band lower limit */
 105                 return (freq - 5000) / 5;
 106         else if (freq >= 58320 && freq <= 64800)
 107                 return (freq - 56160) / 2160;
 108         else
 109                 return 0;
 110 }
 111 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 112
 113 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 114                                                   int freq)
 115 {
 116         enum ieee80211_band band;
 117         struct ieee80211_supported_band *sband;
 118         int i;
 119
 120         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 121                 sband = wiphy->bands[band];
 122
 123                 if (!sband)
 124                         continue;
 125
 126                 for (i = 0; i < sband->n_channels; i++) {
 127                         if (sband->channels[i].center_freq == freq)
 128                                 return &sband->channels[i];
 129                 }
 130         }
 131
 132         return NULL;
 133 }
 134 EXPORT_SYMBOL(__ieee80211_get_channel);
 135
 136 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 137                                      enum ieee80211_band band)
 138 {
 139         int i, want;
 140
 141         switch (band) {
 142         case IEEE80211_BAND_5GHZ:
 143                 want = 3;
 144                 for (i = 0; i < sband->n_bitrates; i++) {
 145                         if (sband->bitrates[i].bitrate == 60 ||
 146                             sband->bitrates[i].bitrate == 120 ||
 147                             sband->bitrates[i].bitrate == 240) {
 148                                 sband->bitrates[i].flags |=
 149                                         IEEE80211_RATE_MANDATORY_A;
 150                                 want--;
 151                         }
 152                 }
 153                 WARN_ON(want);
 154                 break;
 155         case IEEE80211_BAND_2GHZ:
 156                 want = 7;
 157                 for (i = 0; i < sband->n_bitrates; i++) {
 158                         if (sband->bitrates[i].bitrate == 10) {
 159                                 sband->bitrates[i].flags |=
 160                                         IEEE80211_RATE_MANDATORY_B |
 161                                         IEEE80211_RATE_MANDATORY_G;
 162                                 want--;
 163                         }
 164
 165                         if (sband->bitrates[i].bitrate == 20 ||
 166                             sband->bitrates[i].bitrate == 55 ||
 167                             sband->bitrates[i].bitrate == 110 ||
 168                             sband->bitrates[i].bitrate == 60 ||
 169                             sband->bitrates[i].bitrate == 120 ||
 170                             sband->bitrates[i].bitrate == 240) {
 171                                 sband->bitrates[i].flags |=
 172                                         IEEE80211_RATE_MANDATORY_G;
 173                                 want--;
 174                         }
 175
 176                         if (sband->bitrates[i].bitrate != 10 &&
 177                             sband->bitrates[i].bitrate != 20 &&
 178                             sband->bitrates[i].bitrate != 55 &&
 179                             sband->bitrates[i].bitrate != 110)
 180                                 sband->bitrates[i].flags |=
 181                                         IEEE80211_RATE_ERP_G;
 182                 }
 183                 WARN_ON(want != 0 && want != 3 && want != 6);
 184                 break;
 185         case IEEE80211_BAND_60GHZ:
 186                 /* check for mandatory HT MCS 1..4 */
 187                 WARN_ON(!sband->ht_cap.ht_supported);
 188                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 189                 break;
 190         case IEEE80211_NUM_BANDS:
 191                 WARN_ON(1);
 192                 break;
 193         }
 194 }
 195
 196 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 197 {
 198         enum ieee80211_band band;
 199
 200         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 201                 if (wiphy->bands[band])
 202                         set_mandatory_flags_band(wiphy->bands[band], band);
 203 }
 204
 205 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 206 {
 207         int i;
 208         for (i = 0; i < wiphy->n_cipher_suites; i++)
 209                 if (cipher == wiphy->cipher_suites[i])
 210                         return true;
 211         return false;
 212 }
 213
 214 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 215                                    struct key_params *params, int key_idx,
 216                                    bool pairwise, const u8 *mac_addr)
 217 {
 218         if (key_idx > 5)
 219                 return -EINVAL;
 220
 221         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 222                 return -EINVAL;
 223
 224         if (pairwise && !mac_addr)
 225                 return -EINVAL;
 226
 227         /*
 228          * Disallow pairwise keys with non-zero index unless it's WEP
 229          * or a vendor specific cipher (because current deployments use
 230          * pairwise WEP keys with non-zero indices and for vendor specific
 231          * ciphers this should be validated in the driver or hardware level
 232          * - but 802.11i clearly specifies to use zero)
 233          */
 234         if (pairwise && key_idx &&
 235             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 236              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 237              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 238                 return -EINVAL;
 239
 240         switch (params->cipher) {
 241         case WLAN_CIPHER_SUITE_WEP40:
 242                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 243                         return -EINVAL;
 244                 break;
 245         case WLAN_CIPHER_SUITE_TKIP:
 246                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 247                         return -EINVAL;
 248                 break;
 249         case WLAN_CIPHER_SUITE_CCMP:
 250                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 251                         return -EINVAL;
 252                 break;
 253         case WLAN_CIPHER_SUITE_WEP104:
 254                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 255                         return -EINVAL;
 256                 break;
 257         case WLAN_CIPHER_SUITE_AES_CMAC:
 258                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 259                         return -EINVAL;
 260                 break;
 261         default:
 262                 /*
 263                  * We don't know anything about this algorithm,
 264                  * allow using it -- but the driver must check
 265                  * all parameters! We still check below whether
 266                  * or not the driver supports this algorithm,
 267                  * of course.
 268                  */
 269                 break;
 270         }
 271
 272         if (params->seq) {
 273                 switch (params->cipher) {
 274                 case WLAN_CIPHER_SUITE_WEP40:
 275                 case WLAN_CIPHER_SUITE_WEP104:
 276                         /* These ciphers do not use key sequence */
 277                         return -EINVAL;
 278                 case WLAN_CIPHER_SUITE_TKIP:
 279                 case WLAN_CIPHER_SUITE_CCMP:
 280                 case WLAN_CIPHER_SUITE_AES_CMAC:
 281                         if (params->seq_len != 6)
 282                                 return -EINVAL;
 283                         break;
 284                 }
 285         }
 286
 287         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 288                 return -EINVAL;
 289
 290         return 0;
 291 }
 292
 293 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 294 {
 295         unsigned int hdrlen = 24;
 296
 297         if (ieee80211_is_data(fc)) {
 298                 if (ieee80211_has_a4(fc))
 299                         hdrlen = 30;
 300                 if (ieee80211_is_data_qos(fc)) {
 301                         hdrlen += IEEE80211_QOS_CTL_LEN;
 302                         if (ieee80211_has_order(fc))
 303                                 hdrlen += IEEE80211_HT_CTL_LEN;
 304                 }
 305                 goto out;
 306         }
 307
 308         if (ieee80211_is_ctl(fc)) {
 309                 /*
 310                  * ACK and CTS are 10 bytes, all others 16. To see how
 311                  * to get this condition consider
 312                  *   subtype mask:   0b0000000011110000 (0x00F0)
 313                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 314                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 315                  *   bits that matter:         ^^^      (0x00E0)
 316                  *   value of those: 0b0000000011000000 (0x00C0)
 317                  */
 318                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 319                         hdrlen = 10;
 320                 else
 321                         hdrlen = 16;
 322         }
 323 out:
 324         return hdrlen;
 325 }
 326 EXPORT_SYMBOL(ieee80211_hdrlen);
 327
 328 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 329 {
 330         const struct ieee80211_hdr *hdr =
 331                         (const struct ieee80211_hdr *)skb->data;
 332         unsigned int hdrlen;
 333
 334         if (unlikely(skb->len < 10))
 335                 return 0;
 336         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 337         if (unlikely(hdrlen > skb->len))
 338                 return 0;
 339         return hdrlen;
 340 }
 341 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 342
 343 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 344 {
 345         int ae = meshhdr->flags & MESH_FLAGS_AE;
 346         /* 802.11-2012, 8.2.4.7.3 */
 347         switch (ae) {
 348         default:
 349         case 0:
 350                 return 6;
 351         case MESH_FLAGS_AE_A4:
 352                 return 12;
 353         case MESH_FLAGS_AE_A5_A6:
 354                 return 18;
 355         }
 356 }
 357 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 358
 359 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 360                            enum nl80211_iftype iftype)
 361 {
 362         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 363         u16 hdrlen, ethertype;
 364         u8 *payload;
 365         u8 dst[ETH_ALEN];
 366         u8 src[ETH_ALEN] __aligned(2);
 367
 368         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 369                 return -1;
 370
 371         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 372
 373         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 374          * header
 375          * IEEE 802.11 address fields:
 376          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 377          *   0     0   DA    SA    BSSID n/a
 378          *   0     1   DA    BSSID SA    n/a
 379          *   1     0   BSSID SA    DA    n/a
 380          *   1     1   RA    TA    DA    SA
 381          */
 382         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 383         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 384
 385         switch (hdr->frame_control &
 386                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 387         case cpu_to_le16(IEEE80211_FCTL_TODS):
 388                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 389                              iftype != NL80211_IFTYPE_AP_VLAN &&
 390                              iftype != NL80211_IFTYPE_P2P_GO))
 391                         return -1;
 392                 break;
 393         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 394                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 395                              iftype != NL80211_IFTYPE_MESH_POINT &&
 396                              iftype != NL80211_IFTYPE_AP_VLAN &&
 397                              iftype != NL80211_IFTYPE_STATION))
 398                         return -1;
 399                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 400                         struct ieee80211s_hdr *meshdr =
 401                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 402                         /* make sure meshdr->flags is on the linear part */
 403                         if (!pskb_may_pull(skb, hdrlen + 1))
 404                                 return -1;
 405                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 406                                 return -1;
 407                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 408                                 skb_copy_bits(skb, hdrlen +
 409                                         offsetof(struct ieee80211s_hdr, eaddr1),
 410                                         dst, ETH_ALEN);
 411                                 skb_copy_bits(skb, hdrlen +
 412                                         offsetof(struct ieee80211s_hdr, eaddr2),
 413                                         src, ETH_ALEN);
 414                         }
 415                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 416                 }
 417                 break;
 418         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 419                 if ((iftype != NL80211_IFTYPE_STATION &&
 420                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 421                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 422                     (is_multicast_ether_addr(dst) &&
 423                      ether_addr_equal(src, addr)))
 424                         return -1;
 425                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 426                         struct ieee80211s_hdr *meshdr =
 427                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 428                         /* make sure meshdr->flags is on the linear part */
 429                         if (!pskb_may_pull(skb, hdrlen + 1))
 430                                 return -1;
 431                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 432                                 return -1;
 433                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 434                                 skb_copy_bits(skb, hdrlen +
 435                                         offsetof(struct ieee80211s_hdr, eaddr1),
 436                                         src, ETH_ALEN);
 437                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 438                 }
 439                 break;
 440         case cpu_to_le16(0):
 441                 if (iftype != NL80211_IFTYPE_ADHOC &&
 442                     iftype != NL80211_IFTYPE_STATION)
 443                                 return -1;
 444                 break;
 445         }
 446
 447         if (!pskb_may_pull(skb, hdrlen + 8))
 448                 return -1;
 449
 450         payload = skb->data + hdrlen;
 451         ethertype = (payload[6] << 8) | payload[7];
 452
 453         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 454                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 455                    ether_addr_equal(payload, bridge_tunnel_header))) {
 456                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 457                  * replace EtherType */
 458                 skb_pull(skb, hdrlen + 6);
 459                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 460                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 461         } else {
 462                 struct ethhdr *ehdr;
 463                 __be16 len;
 464
 465                 skb_pull(skb, hdrlen);
 466                 len = htons(skb->len);
 467                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 468                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 469                 memcpy(ehdr->h_source, src, ETH_ALEN);
 470                 ehdr->h_proto = len;
 471         }
 472         return 0;
 473 }
 474 EXPORT_SYMBOL(ieee80211_data_to_8023);
 475
 476 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 477                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 478 {
 479         struct ieee80211_hdr hdr;
 480         u16 hdrlen, ethertype;
 481         __le16 fc;
 482         const u8 *encaps_data;
 483         int encaps_len, skip_header_bytes;
 484         int nh_pos, h_pos;
 485         int head_need;
 486
 487         if (unlikely(skb->len < ETH_HLEN))
 488                 return -EINVAL;
 489
 490         nh_pos = skb_network_header(skb) - skb->data;
 491         h_pos = skb_transport_header(skb) - skb->data;
 492
 493         /* convert Ethernet header to proper 802.11 header (based on
 494          * operation mode) */
 495         ethertype = (skb->data[12] << 8) | skb->data[13];
 496         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 497
 498         switch (iftype) {
 499         case NL80211_IFTYPE_AP:
 500         case NL80211_IFTYPE_AP_VLAN:
 501         case NL80211_IFTYPE_P2P_GO:
 502                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 503                 /* DA BSSID SA */
 504                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 505                 memcpy(hdr.addr2, addr, ETH_ALEN);
 506                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 507                 hdrlen = 24;
 508                 break;
 509         case NL80211_IFTYPE_STATION:
 510         case NL80211_IFTYPE_P2P_CLIENT:
 511                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 512                 /* BSSID SA DA */
 513                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 514                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 515                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 516                 hdrlen = 24;
 517                 break;
 518         case NL80211_IFTYPE_ADHOC:
 519                 /* DA SA BSSID */
 520                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 521                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 522                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 523                 hdrlen = 24;
 524                 break;
 525         default:
 526                 return -EOPNOTSUPP;
 527         }
 528
 529         if (qos) {
 530                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 531                 hdrlen += 2;
 532         }
 533
 534         hdr.frame_control = fc;
 535         hdr.duration_id = 0;
 536         hdr.seq_ctrl = 0;
 537
 538         skip_header_bytes = ETH_HLEN;
 539         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 540                 encaps_data = bridge_tunnel_header;
 541                 encaps_len = sizeof(bridge_tunnel_header);
 542                 skip_header_bytes -= 2;
 543         } else if (ethertype >= ETH_P_802_3_MIN) {
 544                 encaps_data = rfc1042_header;
 545                 encaps_len = sizeof(rfc1042_header);
 546                 skip_header_bytes -= 2;
 547         } else {
 548                 encaps_data = NULL;
 549                 encaps_len = 0;
 550         }
 551
 552         skb_pull(skb, skip_header_bytes);
 553         nh_pos -= skip_header_bytes;
 554         h_pos -= skip_header_bytes;
 555
 556         head_need = hdrlen + encaps_len - skb_headroom(skb);
 557
 558         if (head_need > 0 || skb_cloned(skb)) {
 559                 head_need = max(head_need, 0);
 560                 if (head_need)
 561                         skb_orphan(skb);
 562
 563                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 564                         return -ENOMEM;
 565
 566                 skb->truesize += head_need;
 567         }
 568
 569         if (encaps_data) {
 570                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 571                 nh_pos += encaps_len;
 572                 h_pos += encaps_len;
 573         }
 574
 575         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 576
 577         nh_pos += hdrlen;
 578         h_pos += hdrlen;
 579
 580         /* Update skb pointers to various headers since this modified frame
 581          * is going to go through Linux networking code that may potentially
 582          * need things like pointer to IP header. */
 583         skb_set_mac_header(skb, 0);
 584         skb_set_network_header(skb, nh_pos);
 585         skb_set_transport_header(skb, h_pos);
 586
 587         return 0;
 588 }
 589 EXPORT_SYMBOL(ieee80211_data_from_8023);
 590
 591
 592 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 593                               const u8 *addr, enum nl80211_iftype iftype,
 594                               const unsigned int extra_headroom,
 595                               bool has_80211_header)
 596 {
 597         struct sk_buff *frame = NULL;
 598         u16 ethertype;
 599         u8 *payload;
 600         const struct ethhdr *eth;
 601         int remaining, err;
 602         u8 dst[ETH_ALEN], src[ETH_ALEN];
 603
 604         if (has_80211_header) {
 605                 err = ieee80211_data_to_8023(skb, addr, iftype);
 606                 if (err)
 607                         goto out;
 608
 609                 /* skip the wrapping header */
 610                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 611                 if (!eth)
 612                         goto out;
 613         } else {
 614                 eth = (struct ethhdr *) skb->data;
 615         }
 616
 617         while (skb != frame) {
 618                 u8 padding;
 619                 __be16 len = eth->h_proto;
 620                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 621
 622                 remaining = skb->len;
 623                 memcpy(dst, eth->h_dest, ETH_ALEN);
 624                 memcpy(src, eth->h_source, ETH_ALEN);
 625
 626                 padding = (4 - subframe_len) & 0x3;
 627                 /* the last MSDU has no padding */
 628                 if (subframe_len > remaining)
 629                         goto purge;
 630
 631                 skb_pull(skb, sizeof(struct ethhdr));
 632                 /* reuse skb for the last subframe */
 633                 if (remaining <= subframe_len + padding)
 634                         frame = skb;
 635                 else {
 636                         unsigned int hlen = ALIGN(extra_headroom, 4);
 637                         /*
 638                          * Allocate and reserve two bytes more for payload
 639                          * alignment since sizeof(struct ethhdr) is 14.
 640                          */
 641                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 642                         if (!frame)
 643                                 goto purge;
 644
 645                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 646                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 647                                 ntohs(len));
 648
 649                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 650                                                         padding);
 651                         if (!eth) {
 652                                 dev_kfree_skb(frame);
 653                                 goto purge;
 654                         }
 655                 }
 656
 657                 skb_reset_network_header(frame);
 658                 frame->dev = skb->dev;
 659                 frame->priority = skb->priority;
 660
 661                 payload = frame->data;
 662                 ethertype = (payload[6] << 8) | payload[7];
 663
 664                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 665                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 666                            ether_addr_equal(payload, bridge_tunnel_header))) {
 667                         /* remove RFC1042 or Bridge-Tunnel
 668                          * encapsulation and replace EtherType */
 669                         skb_pull(frame, 6);
 670                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 671                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 672                 } else {
 673                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 674                                 sizeof(__be16));
 675                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 676                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 677                 }
 678                 __skb_queue_tail(list, frame);
 679         }
 680
 681         return;
 682
 683  purge:
 684         __skb_queue_purge(list);
 685  out:
 686         dev_kfree_skb(skb);
 687 }
 688 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 689
 690 /* Given a data frame determine the 802.1p/1d tag to use. */
 691 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 692 {
 693         unsigned int dscp;
 694
 695         /* skb->priority values from 256->263 are magic values to
 696          * directly indicate a specific 802.1d priority.  This is used
 697          * to allow 802.1d priority to be passed directly in from VLAN
 698          * tags, etc.
 699          */
 700         if (skb->priority >= 256 && skb->priority <= 263)
 701                 return skb->priority - 256;
 702
 703         switch (skb->protocol) {
 704         case htons(ETH_P_IP):
 705                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 706                 break;
 707         case htons(ETH_P_IPV6):
 708                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 709                 break;
 710         default:
 711                 return 0;
 712         }
 713
 714         return dscp >> 5;
 715 }
 716 EXPORT_SYMBOL(cfg80211_classify8021d);
 717
 718 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 719 {
 720         const struct cfg80211_bss_ies *ies;
 721
 722         ies = rcu_dereference(bss->ies);
 723         if (!ies)
 724                 return NULL;
 725
 726         return cfg80211_find_ie(ie, ies->data, ies->len);
 727 }
 728 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 729
 730 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 731 {
 732         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 733         struct net_device *dev = wdev->netdev;
 734         int i;
 735
 736         if (!wdev->connect_keys)
 737                 return;
 738
 739         for (i = 0; i < 6; i++) {
 740                 if (!wdev->connect_keys->params[i].cipher)
 741                         continue;
 742                 if (rdev_add_key(rdev, dev, i, false, NULL,
 743                                  &wdev->connect_keys->params[i])) {
 744                         netdev_err(dev, "failed to set key %d\n", i);
 745                         continue;
 746                 }
 747                 if (wdev->connect_keys->def == i)
 748                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 749                                 netdev_err(dev, "failed to set defkey %d\n", i);
 750                                 continue;
 751                         }
 752                 if (wdev->connect_keys->defmgmt == i)
 753                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 754                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 755         }
 756
 757         kfree(wdev->connect_keys);
 758         wdev->connect_keys = NULL;
 759 }
 760
 761 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 762 {
 763         struct cfg80211_event *ev;
 764         unsigned long flags;
 765         const u8 *bssid = NULL;
 766
 767         spin_lock_irqsave(&wdev->event_lock, flags);
 768         while (!list_empty(&wdev->event_list)) {
 769                 ev = list_first_entry(&wdev->event_list,
 770                                       struct cfg80211_event, list);
 771                 list_del(&ev->list);
 772                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 773
 774                 wdev_lock(wdev);
 775                 switch (ev->type) {
 776                 case EVENT_CONNECT_RESULT:
 777                         if (!is_zero_ether_addr(ev->cr.bssid))
 778                                 bssid = ev->cr.bssid;
 779                         __cfg80211_connect_result(
 780                                 wdev->netdev, bssid,
 781                                 ev->cr.req_ie, ev->cr.req_ie_len,
 782                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 783                                 ev->cr.status,
 784                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 785                                 NULL);
 786                         break;
 787                 case EVENT_ROAMED:
 788                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 789                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 790                                           ev->rm.resp_ie_len);
 791                         break;
 792                 case EVENT_DISCONNECTED:
 793                         __cfg80211_disconnected(wdev->netdev,
 794                                                 ev->dc.ie, ev->dc.ie_len,
 795                                                 ev->dc.reason, true);
 796                         break;
 797                 case EVENT_IBSS_JOINED:
 798                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 799                         break;
 800                 }
 801                 wdev_unlock(wdev);
 802
 803                 kfree(ev);
 804
 805                 spin_lock_irqsave(&wdev->event_lock, flags);
 806         }
 807         spin_unlock_irqrestore(&wdev->event_lock, flags);
 808 }
 809
 810 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 811 {
 812         struct wireless_dev *wdev;
 813
 814         ASSERT_RTNL();
 815         ASSERT_RDEV_LOCK(rdev);
 816
 817         list_for_each_entry(wdev, &rdev->wdev_list, list)
 818                 cfg80211_process_wdev_events(wdev);
 819 }
 820
 821 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 822                           struct net_device *dev, enum nl80211_iftype ntype,
 823                           u32 *flags, struct vif_params *params)
 824 {
 825         int err;
 826         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 827
 828         ASSERT_RDEV_LOCK(rdev);
 829
 830         /* don't support changing VLANs, you just re-create them */
 831         if (otype == NL80211_IFTYPE_AP_VLAN)
 832                 return -EOPNOTSUPP;
 833
 834         /* cannot change into P2P device type */
 835         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 836                 return -EOPNOTSUPP;
 837
 838         if (!rdev->ops->change_virtual_intf ||
 839             !(rdev->wiphy.interface_modes & (1 << ntype)))
 840                 return -EOPNOTSUPP;
 841
 842         /* if it's part of a bridge, reject changing type to station/ibss */
 843         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 844             (ntype == NL80211_IFTYPE_ADHOC ||
 845              ntype == NL80211_IFTYPE_STATION ||
 846              ntype == NL80211_IFTYPE_P2P_CLIENT))
 847                 return -EBUSY;
 848
 849         if (ntype != otype && netif_running(dev)) {
 850                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 851                                                     ntype);
 852                 if (err)
 853                         return err;
 854
 855                 dev->ieee80211_ptr->use_4addr = false;
 856                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 857
 858                 switch (otype) {
 859                 case NL80211_IFTYPE_AP:
 860                         cfg80211_stop_ap(rdev, dev);
 861                         break;
 862                 case NL80211_IFTYPE_ADHOC:
 863                         cfg80211_leave_ibss(rdev, dev, false);
 864                         break;
 865                 case NL80211_IFTYPE_STATION:
 866                 case NL80211_IFTYPE_P2P_CLIENT:
 867                         wdev_lock(dev->ieee80211_ptr);
 868                         cfg80211_disconnect(rdev, dev,
 869                                             WLAN_REASON_DEAUTH_LEAVING, true);
 870                         wdev_unlock(dev->ieee80211_ptr);
 871                         break;
 872                 case NL80211_IFTYPE_MESH_POINT:
 873                         /* mesh should be handled? */
 874                         break;
 875                 default:
 876                         break;
 877                 }
 878
 879                 cfg80211_process_rdev_events(rdev);
 880         }
 881
 882         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 883
 884         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 885
 886         if (!err && params && params->use_4addr != -1)
 887                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 888
 889         if (!err) {
 890                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 891                 switch (ntype) {
 892                 case NL80211_IFTYPE_STATION:
 893                         if (dev->ieee80211_ptr->use_4addr)
 894                                 break;
 895                         /* fall through */
 896                 case NL80211_IFTYPE_P2P_CLIENT:
 897                 case NL80211_IFTYPE_ADHOC:
 898                         dev->priv_flags |= IFF_DONT_BRIDGE;
 899                         break;
 900                 case NL80211_IFTYPE_P2P_GO:
 901                 case NL80211_IFTYPE_AP:
 902                 case NL80211_IFTYPE_AP_VLAN:
 903                 case NL80211_IFTYPE_WDS:
 904                 case NL80211_IFTYPE_MESH_POINT:
 905                         /* bridging OK */
 906                         break;
 907                 case NL80211_IFTYPE_MONITOR:
 908                         /* monitor can't bridge anyway */
 909                         break;
 910                 case NL80211_IFTYPE_UNSPECIFIED:
 911                 case NUM_NL80211_IFTYPES:
 912                         /* not happening */
 913                         break;
 914                 case NL80211_IFTYPE_P2P_DEVICE:
 915                         WARN_ON(1);
 916                         break;
 917                 }
 918         }
 919
 920         if (!err && ntype != otype && netif_running(dev)) {
 921                 cfg80211_update_iface_num(rdev, ntype, 1);
 922                 cfg80211_update_iface_num(rdev, otype, -1);
 923         }
 924
 925         return err;
 926 }
 927
 928 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 929 {
 930         static const u32 __mcs2bitrate[] = {
 931                 /* control PHY */
 932                 [0] =   275,
 933                 /* SC PHY */
 934                 [1] =  3850,
 935                 [2] =  7700,
 936                 [3] =  9625,
 937                 [4] = 11550,
 938                 [5] = 12512, /* 1251.25 mbps */
 939                 [6] = 15400,
 940                 [7] = 19250,
 941                 [8] = 23100,
 942                 [9] = 25025,
 943                 [10] = 30800,
 944                 [11] = 38500,
 945                 [12] = 46200,
 946                 /* OFDM PHY */
 947                 [13] =  6930,
 948                 [14] =  8662, /* 866.25 mbps */
 949                 [15] = 13860,
 950                 [16] = 17325,
 951                 [17] = 20790,
 952                 [18] = 27720,
 953                 [19] = 34650,
 954                 [20] = 41580,
 955                 [21] = 45045,
 956                 [22] = 51975,
 957                 [23] = 62370,
 958                 [24] = 67568, /* 6756.75 mbps */
 959                 /* LP-SC PHY */
 960                 [25] =  6260,
 961                 [26] =  8340,
 962                 [27] = 11120,
 963                 [28] = 12510,
 964                 [29] = 16680,
 965                 [30] = 22240,
 966                 [31] = 25030,
 967         };
 968
 969         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
 970                 return 0;
 971
 972         return __mcs2bitrate[rate->mcs];
 973 }
 974
 975 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
 976 {
 977         static const u32 base[4][10] = {
 978                 {   6500000,
 979                    13000000,
 980                    19500000,
 981                    26000000,
 982                    39000000,
 983                    52000000,
 984                    58500000,
 985                    65000000,
 986                    78000000,
 987                    0,
 988                 },
 989                 {  13500000,
 990                    27000000,
 991                    40500000,
 992                    54000000,
 993                    81000000,
 994                   108000000,
 995                   121500000,
 996                   135000000,
 997                   162000000,
 998                   180000000,
 999                 },
1000                 {  29300000,
1001                    58500000,
1002                    87800000,
1003                   117000000,
1004                   175500000,
1005                   234000000,
1006                   263300000,
1007                   292500000,
1008                   351000000,
1009                   390000000,
1010                 },
1011                 {  58500000,
1012                   117000000,
1013                   175500000,
1014                   234000000,
1015                   351000000,
1016                   468000000,
1017                   526500000,
1018                   585000000,
1019                   702000000,
1020                   780000000,
1021                 },
1022         };
1023         u32 bitrate;
1024         int idx;
1025
1026         if (WARN_ON_ONCE(rate->mcs > 9))
1027                 return 0;
1028
1029         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1030                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1031                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1032                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1033
1034         bitrate = base[idx][rate->mcs];
1035         bitrate *= rate->nss;
1036
1037         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1038                 bitrate = (bitrate / 9) * 10;
1039
1040         /* do NOT round down here */
1041         return (bitrate + 50000) / 100000;
1042 }
1043
1044 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1045 {
1046         int modulation, streams, bitrate;
1047
1048         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1049             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1050                 return rate->legacy;
1051         if (rate->flags & RATE_INFO_FLAGS_60G)
1052                 return cfg80211_calculate_bitrate_60g(rate);
1053         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1054                 return cfg80211_calculate_bitrate_vht(rate);
1055
1056         /* the formula below does only work for MCS values smaller than 32 */
1057         if (WARN_ON_ONCE(rate->mcs >= 32))
1058                 return 0;
1059
1060         modulation = rate->mcs & 7;
1061         streams = (rate->mcs >> 3) + 1;
1062
1063         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1064                         13500000 : 6500000;
1065
1066         if (modulation < 4)
1067                 bitrate *= (modulation + 1);
1068         else if (modulation == 4)
1069                 bitrate *= (modulation + 2);
1070         else
1071                 bitrate *= (modulation + 3);
1072
1073         bitrate *= streams;
1074
1075         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1076                 bitrate = (bitrate / 9) * 10;
1077
1078         /* do NOT round down here */
1079         return (bitrate + 50000) / 100000;
1080 }
1081 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1082
1083 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1084                           enum ieee80211_p2p_attr_id attr,
1085                           u8 *buf, unsigned int bufsize)
1086 {
1087         u8 *out = buf;
1088         u16 attr_remaining = 0;
1089         bool desired_attr = false;
1090         u16 desired_len = 0;
1091
1092         while (len > 0) {
1093                 unsigned int iedatalen;
1094                 unsigned int copy;
1095                 const u8 *iedata;
1096
1097                 if (len < 2)
1098                         return -EILSEQ;
1099                 iedatalen = ies[1];
1100                 if (iedatalen + 2 > len)
1101                         return -EILSEQ;
1102
1103                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1104                         goto cont;
1105
1106                 if (iedatalen < 4)
1107                         goto cont;
1108
1109                 iedata = ies + 2;
1110
1111                 /* check WFA OUI, P2P subtype */
1112                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1113                     iedata[2] != 0x9a || iedata[3] != 0x09)
1114                         goto cont;
1115
1116                 iedatalen -= 4;
1117                 iedata += 4;
1118
1119                 /* check attribute continuation into this IE */
1120                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1121                 if (copy && desired_attr) {
1122                         desired_len += copy;
1123                         if (out) {
1124                                 memcpy(out, iedata, min(bufsize, copy));
1125                                 out += min(bufsize, copy);
1126                                 bufsize -= min(bufsize, copy);
1127                         }
1128
1129
1130                         if (copy == attr_remaining)
1131                                 return desired_len;
1132                 }
1133
1134                 attr_remaining -= copy;
1135                 if (attr_remaining)
1136                         goto cont;
1137
1138                 iedatalen -= copy;
1139                 iedata += copy;
1140
1141                 while (iedatalen > 0) {
1142                         u16 attr_len;
1143
1144                         /* P2P attribute ID & size must fit */
1145                         if (iedatalen < 3)
1146                                 return -EILSEQ;
1147                         desired_attr = iedata[0] == attr;
1148                         attr_len = get_unaligned_le16(iedata + 1);
1149                         iedatalen -= 3;
1150                         iedata += 3;
1151
1152                         copy = min_t(unsigned int, attr_len, iedatalen);
1153
1154                         if (desired_attr) {
1155                                 desired_len += copy;
1156                                 if (out) {
1157                                         memcpy(out, iedata, min(bufsize, copy));
1158                                         out += min(bufsize, copy);
1159                                         bufsize -= min(bufsize, copy);
1160                                 }
1161
1162                                 if (copy == attr_len)
1163                                         return desired_len;
1164                         }
1165
1166                         iedata += copy;
1167                         iedatalen -= copy;
1168                         attr_remaining = attr_len - copy;
1169                 }
1170
1171  cont:
1172                 len -= ies[1] + 2;
1173                 ies += ies[1] + 2;
1174         }
1175
1176         if (attr_remaining && desired_attr)
1177                 return -EILSEQ;
1178
1179         return -ENOENT;
1180 }
1181 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1182
1183 bool ieee80211_operating_class_to_band(u8 operating_class,
1184                                        enum ieee80211_band *band)
1185 {
1186         switch (operating_class) {
1187         case 112:
1188         case 115 ... 127:
1189                 *band = IEEE80211_BAND_5GHZ;
1190                 return true;
1191         case 81:
1192         case 82:
1193         case 83:
1194         case 84:
1195                 *band = IEEE80211_BAND_2GHZ;
1196                 return true;
1197         case 180:
1198                 *band = IEEE80211_BAND_60GHZ;
1199                 return true;
1200         }
1201
1202         return false;
1203 }
1204 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1205
1206 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1207                                  u32 beacon_int)
1208 {
1209         struct wireless_dev *wdev;
1210         int res = 0;
1211
1212         if (!beacon_int)
1213                 return -EINVAL;
1214
1215         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1216                 if (!wdev->beacon_interval)
1217                         continue;
1218                 if (wdev->beacon_interval != beacon_int) {
1219                         res = -EINVAL;
1220                         break;
1221                 }
1222         }
1223
1224         return res;
1225 }
1226
1227 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1228                                  struct wireless_dev *wdev,
1229                                  enum nl80211_iftype iftype,
1230                                  struct ieee80211_channel *chan,
1231                                  enum cfg80211_chan_mode chanmode,
1232                                  u8 radar_detect)
1233 {
1234         struct wireless_dev *wdev_iter;
1235         u32 used_iftypes = BIT(iftype);
1236         int num[NUM_NL80211_IFTYPES];
1237         struct ieee80211_channel
1238                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1239         struct ieee80211_channel *ch;
1240         enum cfg80211_chan_mode chmode;
1241         int num_different_channels = 0;
1242         int total = 1;
1243         bool radar_required;
1244         int i, j;
1245
1246         ASSERT_RTNL();
1247
1248         if (WARN_ON(hweight32(radar_detect) > 1))
1249                 return -EINVAL;
1250
1251         switch (iftype) {
1252         case NL80211_IFTYPE_ADHOC:
1253         case NL80211_IFTYPE_AP:
1254         case NL80211_IFTYPE_AP_VLAN:
1255         case NL80211_IFTYPE_MESH_POINT:
1256         case NL80211_IFTYPE_P2P_GO:
1257         case NL80211_IFTYPE_WDS:
1258                 radar_required = !!(chan &&
1259                                     (chan->flags & IEEE80211_CHAN_RADAR));
1260                 break;
1261         case NL80211_IFTYPE_P2P_CLIENT:
1262         case NL80211_IFTYPE_STATION:
1263         case NL80211_IFTYPE_P2P_DEVICE:
1264         case NL80211_IFTYPE_MONITOR:
1265                 radar_required = false;
1266                 break;
1267         case NUM_NL80211_IFTYPES:
1268         case NL80211_IFTYPE_UNSPECIFIED:
1269         default:
1270                 return -EINVAL;
1271         }
1272
1273         if (radar_required && !radar_detect)
1274                 return -EINVAL;
1275
1276         /* Always allow software iftypes */
1277         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1278                 if (radar_detect)
1279                         return -EINVAL;
1280                 return 0;
1281         }
1282
1283         memset(num, 0, sizeof(num));
1284         memset(used_channels, 0, sizeof(used_channels));
1285
1286         num[iftype] = 1;
1287
1288         switch (chanmode) {
1289         case CHAN_MODE_UNDEFINED:
1290                 break;
1291         case CHAN_MODE_SHARED:
1292                 WARN_ON(!chan);
1293                 used_channels[0] = chan;
1294                 num_different_channels++;
1295                 break;
1296         case CHAN_MODE_EXCLUSIVE:
1297                 num_different_channels++;
1298                 break;
1299         }
1300
1301         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1302                 if (wdev_iter == wdev)
1303                         continue;
1304                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1305                         if (!wdev_iter->p2p_started)
1306                                 continue;
1307                 } else if (wdev_iter->netdev) {
1308                         if (!netif_running(wdev_iter->netdev))
1309                                 continue;
1310                 } else {
1311                         WARN_ON(1);
1312                 }
1313
1314                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1315                         continue;
1316
1317                 /*
1318                  * We may be holding the "wdev" mutex, but now need to lock
1319                  * wdev_iter. This is OK because once we get here wdev_iter
1320                  * is not wdev (tested above), but we need to use the nested
1321                  * locking for lockdep.
1322                  */
1323                 mutex_lock_nested(&wdev_iter->mtx, 1);
1324                 __acquire(wdev_iter->mtx);
1325                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1326                 wdev_unlock(wdev_iter);
1327
1328                 switch (chmode) {
1329                 case CHAN_MODE_UNDEFINED:
1330                         break;
1331                 case CHAN_MODE_SHARED:
1332                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1333                                 if (!used_channels[i] || used_channels[i] == ch)
1334                                         break;
1335
1336                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1337                                 return -EBUSY;
1338
1339                         if (used_channels[i] == NULL) {
1340                                 used_channels[i] = ch;
1341                                 num_different_channels++;
1342                         }
1343                         break;
1344                 case CHAN_MODE_EXCLUSIVE:
1345                         num_different_channels++;
1346                         break;
1347                 }
1348
1349                 num[wdev_iter->iftype]++;
1350                 total++;
1351                 used_iftypes |= BIT(wdev_iter->iftype);
1352         }
1353
1354         if (total == 1 && !radar_detect)
1355                 return 0;
1356
1357         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1358                 const struct ieee80211_iface_combination *c;
1359                 struct ieee80211_iface_limit *limits;
1360                 u32 all_iftypes = 0;
1361
1362                 c = &rdev->wiphy.iface_combinations[i];
1363
1364                 if (total > c->max_interfaces)
1365                         continue;
1366                 if (num_different_channels > c->num_different_channels)
1367                         continue;
1368
1369                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1370                                  GFP_KERNEL);
1371                 if (!limits)
1372                         return -ENOMEM;
1373
1374                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1375                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1376                                 continue;
1377                         for (j = 0; j < c->n_limits; j++) {
1378                                 all_iftypes |= limits[j].types;
1379                                 if (!(limits[j].types & BIT(iftype)))
1380                                         continue;
1381                                 if (limits[j].max < num[iftype])
1382                                         goto cont;
1383                                 limits[j].max -= num[iftype];
1384                         }
1385                 }
1386
1387                 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1388                         goto cont;
1389
1390                 /*
1391                  * Finally check that all iftypes that we're currently
1392                  * using are actually part of this combination. If they
1393                  * aren't then we can't use this combination and have
1394                  * to continue to the next.
1395                  */
1396                 if ((all_iftypes & used_iftypes) != used_iftypes)
1397                         goto cont;
1398
1399                 /*
1400                  * This combination covered all interface types and
1401                  * supported the requested numbers, so we're good.
1402                  */
1403                 kfree(limits);
1404                 return 0;
1405  cont:
1406                 kfree(limits);
1407         }
1408
1409         return -EBUSY;
1410 }
1411
1412 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1413                            const u8 *rates, unsigned int n_rates,
1414                            u32 *mask)
1415 {
1416         int i, j;
1417
1418         if (!sband)
1419                 return -EINVAL;
1420
1421         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1422                 return -EINVAL;
1423
1424         *mask = 0;
1425
1426         for (i = 0; i < n_rates; i++) {
1427                 int rate = (rates[i] & 0x7f) * 5;
1428                 bool found = false;
1429
1430                 for (j = 0; j < sband->n_bitrates; j++) {
1431                         if (sband->bitrates[j].bitrate == rate) {
1432                                 found = true;
1433                                 *mask |= BIT(j);
1434                                 break;
1435                         }
1436                 }
1437                 if (!found)
1438                         return -EINVAL;
1439         }
1440
1441         /*
1442          * mask must have at least one bit set here since we
1443          * didn't accept a 0-length rates array nor allowed
1444          * entries in the array that didn't exist
1445          */
1446
1447         return 0;
1448 }
1449
1450 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1451 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1452 const unsigned char rfc1042_header[] __aligned(2) =
1453         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1454 EXPORT_SYMBOL(rfc1042_header);
1455
1456 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1457 const unsigned char bridge_tunnel_header[] __aligned(2) =
1458         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1459 EXPORT_SYMBOL(bridge_tunnel_header);