net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/export.h>
   7 #include <linux/bitops.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/slab.h>
  10 #include <net/cfg80211.h>
  11 #include <net/ip.h>
  12 #include <net/dsfield.h>
  13 #include <linux/if_vlan.h>
  14 #include <linux/mpls.h>
  15 #include "core.h"
  16 #include "rdev-ops.h"
  17
  18
  19 struct ieee80211_rate *
  20 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  21                             u32 basic_rates, int bitrate)
  22 {
  23         struct ieee80211_rate *result = &sband->bitrates[0];
  24         int i;
  25
  26         for (i = 0; i < sband->n_bitrates; i++) {
  27                 if (!(basic_rates & BIT(i)))
  28                         continue;
  29                 if (sband->bitrates[i].bitrate > bitrate)
  30                         continue;
  31                 result = &sband->bitrates[i];
  32         }
  33
  34         return result;
  35 }
  36 EXPORT_SYMBOL(ieee80211_get_response_rate);
  37
  38 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  39                               enum nl80211_bss_scan_width scan_width)
  40 {
  41         struct ieee80211_rate *bitrates;
  42         u32 mandatory_rates = 0;
  43         enum ieee80211_rate_flags mandatory_flag;
  44         int i;
  45
  46         if (WARN_ON(!sband))
  47                 return 1;
  48
  49         if (sband->band == IEEE80211_BAND_2GHZ) {
  50                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  51                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  52                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  53                 else
  54                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  55         } else {
  56                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  57         }
  58
  59         bitrates = sband->bitrates;
  60         for (i = 0; i < sband->n_bitrates; i++)
  61                 if (bitrates[i].flags & mandatory_flag)
  62                         mandatory_rates |= BIT(i);
  63         return mandatory_rates;
  64 }
  65 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  66
  67 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  68 {
  69         /* see 802.11 17.3.8.3.2 and Annex J
  70          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  71         if (chan <= 0)
  72                 return 0; /* not supported */
  73         switch (band) {
  74         case IEEE80211_BAND_2GHZ:
  75                 if (chan == 14)
  76                         return 2484;
  77                 else if (chan < 14)
  78                         return 2407 + chan * 5;
  79                 break;
  80         case IEEE80211_BAND_5GHZ:
  81                 if (chan >= 182 && chan <= 196)
  82                         return 4000 + chan * 5;
  83                 else
  84                         return 5000 + chan * 5;
  85                 break;
  86         case IEEE80211_BAND_60GHZ:
  87                 if (chan < 5)
  88                         return 56160 + chan * 2160;
  89                 break;
  90         default:
  91                 ;
  92         }
  93         return 0; /* not supported */
  94 }
  95 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  96
  97 int ieee80211_frequency_to_channel(int freq)
  98 {
  99         /* see 802.11 17.3.8.3.2 and Annex J */
 100         if (freq == 2484)
 101                 return 14;
 102         else if (freq < 2484)
 103                 return (freq - 2407) / 5;
 104         else if (freq >= 4910 && freq <= 4980)
 105                 return (freq - 4000) / 5;
 106         else if (freq <= 45000) /* DMG band lower limit */
 107                 return (freq - 5000) / 5;
 108         else if (freq >= 58320 && freq <= 64800)
 109                 return (freq - 56160) / 2160;
 110         else
 111                 return 0;
 112 }
 113 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 114
 115 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 116                                                   int freq)
 117 {
 118         enum ieee80211_band band;
 119         struct ieee80211_supported_band *sband;
 120         int i;
 121
 122         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 123                 sband = wiphy->bands[band];
 124
 125                 if (!sband)
 126                         continue;
 127
 128                 for (i = 0; i < sband->n_channels; i++) {
 129                         if (sband->channels[i].center_freq == freq)
 130                                 return &sband->channels[i];
 131                 }
 132         }
 133
 134         return NULL;
 135 }
 136 EXPORT_SYMBOL(__ieee80211_get_channel);
 137
 138 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 139                                      enum ieee80211_band band)
 140 {
 141         int i, want;
 142
 143         switch (band) {
 144         case IEEE80211_BAND_5GHZ:
 145                 want = 3;
 146                 for (i = 0; i < sband->n_bitrates; i++) {
 147                         if (sband->bitrates[i].bitrate == 60 ||
 148                             sband->bitrates[i].bitrate == 120 ||
 149                             sband->bitrates[i].bitrate == 240) {
 150                                 sband->bitrates[i].flags |=
 151                                         IEEE80211_RATE_MANDATORY_A;
 152                                 want--;
 153                         }
 154                 }
 155                 WARN_ON(want);
 156                 break;
 157         case IEEE80211_BAND_2GHZ:
 158                 want = 7;
 159                 for (i = 0; i < sband->n_bitrates; i++) {
 160                         if (sband->bitrates[i].bitrate == 10) {
 161                                 sband->bitrates[i].flags |=
 162                                         IEEE80211_RATE_MANDATORY_B |
 163                                         IEEE80211_RATE_MANDATORY_G;
 164                                 want--;
 165                         }
 166
 167                         if (sband->bitrates[i].bitrate == 20 ||
 168                             sband->bitrates[i].bitrate == 55 ||
 169                             sband->bitrates[i].bitrate == 110 ||
 170                             sband->bitrates[i].bitrate == 60 ||
 171                             sband->bitrates[i].bitrate == 120 ||
 172                             sband->bitrates[i].bitrate == 240) {
 173                                 sband->bitrates[i].flags |=
 174                                         IEEE80211_RATE_MANDATORY_G;
 175                                 want--;
 176                         }
 177
 178                         if (sband->bitrates[i].bitrate != 10 &&
 179                             sband->bitrates[i].bitrate != 20 &&
 180                             sband->bitrates[i].bitrate != 55 &&
 181                             sband->bitrates[i].bitrate != 110)
 182                                 sband->bitrates[i].flags |=
 183                                         IEEE80211_RATE_ERP_G;
 184                 }
 185                 WARN_ON(want != 0 && want != 3 && want != 6);
 186                 break;
 187         case IEEE80211_BAND_60GHZ:
 188                 /* check for mandatory HT MCS 1..4 */
 189                 WARN_ON(!sband->ht_cap.ht_supported);
 190                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 191                 break;
 192         case IEEE80211_NUM_BANDS:
 193                 WARN_ON(1);
 194                 break;
 195         }
 196 }
 197
 198 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 199 {
 200         enum ieee80211_band band;
 201
 202         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 203                 if (wiphy->bands[band])
 204                         set_mandatory_flags_band(wiphy->bands[band], band);
 205 }
 206
 207 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 208 {
 209         int i;
 210         for (i = 0; i < wiphy->n_cipher_suites; i++)
 211                 if (cipher == wiphy->cipher_suites[i])
 212                         return true;
 213         return false;
 214 }
 215
 216 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 217                                    struct key_params *params, int key_idx,
 218                                    bool pairwise, const u8 *mac_addr)
 219 {
 220         if (key_idx > 5)
 221                 return -EINVAL;
 222
 223         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 224                 return -EINVAL;
 225
 226         if (pairwise && !mac_addr)
 227                 return -EINVAL;
 228
 229         /*
 230          * Disallow pairwise keys with non-zero index unless it's WEP
 231          * or a vendor specific cipher (because current deployments use
 232          * pairwise WEP keys with non-zero indices and for vendor specific
 233          * ciphers this should be validated in the driver or hardware level
 234          * - but 802.11i clearly specifies to use zero)
 235          */
 236         if (pairwise && key_idx &&
 237             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 238              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 239              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 240                 return -EINVAL;
 241
 242         switch (params->cipher) {
 243         case WLAN_CIPHER_SUITE_WEP40:
 244                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 245                         return -EINVAL;
 246                 break;
 247         case WLAN_CIPHER_SUITE_TKIP:
 248                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 249                         return -EINVAL;
 250                 break;
 251         case WLAN_CIPHER_SUITE_CCMP:
 252                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 253                         return -EINVAL;
 254                 break;
 255         case WLAN_CIPHER_SUITE_WEP104:
 256                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 257                         return -EINVAL;
 258                 break;
 259         case WLAN_CIPHER_SUITE_AES_CMAC:
 260                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 261                         return -EINVAL;
 262                 break;
 263         default:
 264                 /*
 265                  * We don't know anything about this algorithm,
 266                  * allow using it -- but the driver must check
 267                  * all parameters! We still check below whether
 268                  * or not the driver supports this algorithm,
 269                  * of course.
 270                  */
 271                 break;
 272         }
 273
 274         if (params->seq) {
 275                 switch (params->cipher) {
 276                 case WLAN_CIPHER_SUITE_WEP40:
 277                 case WLAN_CIPHER_SUITE_WEP104:
 278                         /* These ciphers do not use key sequence */
 279                         return -EINVAL;
 280                 case WLAN_CIPHER_SUITE_TKIP:
 281                 case WLAN_CIPHER_SUITE_CCMP:
 282                 case WLAN_CIPHER_SUITE_AES_CMAC:
 283                         if (params->seq_len != 6)
 284                                 return -EINVAL;
 285                         break;
 286                 }
 287         }
 288
 289         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 290                 return -EINVAL;
 291
 292         return 0;
 293 }
 294
 295 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 296 {
 297         unsigned int hdrlen = 24;
 298
 299         if (ieee80211_is_data(fc)) {
 300                 if (ieee80211_has_a4(fc))
 301                         hdrlen = 30;
 302                 if (ieee80211_is_data_qos(fc)) {
 303                         hdrlen += IEEE80211_QOS_CTL_LEN;
 304                         if (ieee80211_has_order(fc))
 305                                 hdrlen += IEEE80211_HT_CTL_LEN;
 306                 }
 307                 goto out;
 308         }
 309
 310         if (ieee80211_is_ctl(fc)) {
 311                 /*
 312                  * ACK and CTS are 10 bytes, all others 16. To see how
 313                  * to get this condition consider
 314                  *   subtype mask:   0b0000000011110000 (0x00F0)
 315                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 316                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 317                  *   bits that matter:         ^^^      (0x00E0)
 318                  *   value of those: 0b0000000011000000 (0x00C0)
 319                  */
 320                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 321                         hdrlen = 10;
 322                 else
 323                         hdrlen = 16;
 324         }
 325 out:
 326         return hdrlen;
 327 }
 328 EXPORT_SYMBOL(ieee80211_hdrlen);
 329
 330 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 331 {
 332         const struct ieee80211_hdr *hdr =
 333                         (const struct ieee80211_hdr *)skb->data;
 334         unsigned int hdrlen;
 335
 336         if (unlikely(skb->len < 10))
 337                 return 0;
 338         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 339         if (unlikely(hdrlen > skb->len))
 340                 return 0;
 341         return hdrlen;
 342 }
 343 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 344
 345 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 346 {
 347         int ae = meshhdr->flags & MESH_FLAGS_AE;
 348         /* 802.11-2012, 8.2.4.7.3 */
 349         switch (ae) {
 350         default:
 351         case 0:
 352                 return 6;
 353         case MESH_FLAGS_AE_A4:
 354                 return 12;
 355         case MESH_FLAGS_AE_A5_A6:
 356                 return 18;
 357         }
 358 }
 359 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 360
 361 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 362                            enum nl80211_iftype iftype)
 363 {
 364         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 365         u16 hdrlen, ethertype;
 366         u8 *payload;
 367         u8 dst[ETH_ALEN];
 368         u8 src[ETH_ALEN] __aligned(2);
 369
 370         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 371                 return -1;
 372
 373         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 374
 375         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 376          * header
 377          * IEEE 802.11 address fields:
 378          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 379          *   0     0   DA    SA    BSSID n/a
 380          *   0     1   DA    BSSID SA    n/a
 381          *   1     0   BSSID SA    DA    n/a
 382          *   1     1   RA    TA    DA    SA
 383          */
 384         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 385         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 386
 387         switch (hdr->frame_control &
 388                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 389         case cpu_to_le16(IEEE80211_FCTL_TODS):
 390                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 391                              iftype != NL80211_IFTYPE_AP_VLAN &&
 392                              iftype != NL80211_IFTYPE_P2P_GO))
 393                         return -1;
 394                 break;
 395         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 396                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 397                              iftype != NL80211_IFTYPE_MESH_POINT &&
 398                              iftype != NL80211_IFTYPE_AP_VLAN &&
 399                              iftype != NL80211_IFTYPE_STATION))
 400                         return -1;
 401                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 402                         struct ieee80211s_hdr *meshdr =
 403                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 404                         /* make sure meshdr->flags is on the linear part */
 405                         if (!pskb_may_pull(skb, hdrlen + 1))
 406                                 return -1;
 407                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 408                                 return -1;
 409                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 410                                 skb_copy_bits(skb, hdrlen +
 411                                         offsetof(struct ieee80211s_hdr, eaddr1),
 412                                         dst, ETH_ALEN);
 413                                 skb_copy_bits(skb, hdrlen +
 414                                         offsetof(struct ieee80211s_hdr, eaddr2),
 415                                         src, ETH_ALEN);
 416                         }
 417                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 418                 }
 419                 break;
 420         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 421                 if ((iftype != NL80211_IFTYPE_STATION &&
 422                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 423                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 424                     (is_multicast_ether_addr(dst) &&
 425                      ether_addr_equal(src, addr)))
 426                         return -1;
 427                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 428                         struct ieee80211s_hdr *meshdr =
 429                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 430                         /* make sure meshdr->flags is on the linear part */
 431                         if (!pskb_may_pull(skb, hdrlen + 1))
 432                                 return -1;
 433                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
 434                                 return -1;
 435                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 436                                 skb_copy_bits(skb, hdrlen +
 437                                         offsetof(struct ieee80211s_hdr, eaddr1),
 438                                         src, ETH_ALEN);
 439                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 440                 }
 441                 break;
 442         case cpu_to_le16(0):
 443                 if (iftype != NL80211_IFTYPE_ADHOC &&
 444                     iftype != NL80211_IFTYPE_STATION)
 445                                 return -1;
 446                 break;
 447         }
 448
 449         if (!pskb_may_pull(skb, hdrlen + 8))
 450                 return -1;
 451
 452         payload = skb->data + hdrlen;
 453         ethertype = (payload[6] << 8) | payload[7];
 454
 455         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 456                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 457                    ether_addr_equal(payload, bridge_tunnel_header))) {
 458                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 459                  * replace EtherType */
 460                 skb_pull(skb, hdrlen + 6);
 461                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 462                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 463         } else {
 464                 struct ethhdr *ehdr;
 465                 __be16 len;
 466
 467                 skb_pull(skb, hdrlen);
 468                 len = htons(skb->len);
 469                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 470                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 471                 memcpy(ehdr->h_source, src, ETH_ALEN);
 472                 ehdr->h_proto = len;
 473         }
 474         return 0;
 475 }
 476 EXPORT_SYMBOL(ieee80211_data_to_8023);
 477
 478 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 479                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 480 {
 481         struct ieee80211_hdr hdr;
 482         u16 hdrlen, ethertype;
 483         __le16 fc;
 484         const u8 *encaps_data;
 485         int encaps_len, skip_header_bytes;
 486         int nh_pos, h_pos;
 487         int head_need;
 488
 489         if (unlikely(skb->len < ETH_HLEN))
 490                 return -EINVAL;
 491
 492         nh_pos = skb_network_header(skb) - skb->data;
 493         h_pos = skb_transport_header(skb) - skb->data;
 494
 495         /* convert Ethernet header to proper 802.11 header (based on
 496          * operation mode) */
 497         ethertype = (skb->data[12] << 8) | skb->data[13];
 498         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 499
 500         switch (iftype) {
 501         case NL80211_IFTYPE_AP:
 502         case NL80211_IFTYPE_AP_VLAN:
 503         case NL80211_IFTYPE_P2P_GO:
 504                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 505                 /* DA BSSID SA */
 506                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 507                 memcpy(hdr.addr2, addr, ETH_ALEN);
 508                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 509                 hdrlen = 24;
 510                 break;
 511         case NL80211_IFTYPE_STATION:
 512         case NL80211_IFTYPE_P2P_CLIENT:
 513                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 514                 /* BSSID SA DA */
 515                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 516                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 517                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 518                 hdrlen = 24;
 519                 break;
 520         case NL80211_IFTYPE_ADHOC:
 521                 /* DA SA BSSID */
 522                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 523                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 524                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 525                 hdrlen = 24;
 526                 break;
 527         default:
 528                 return -EOPNOTSUPP;
 529         }
 530
 531         if (qos) {
 532                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 533                 hdrlen += 2;
 534         }
 535
 536         hdr.frame_control = fc;
 537         hdr.duration_id = 0;
 538         hdr.seq_ctrl = 0;
 539
 540         skip_header_bytes = ETH_HLEN;
 541         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 542                 encaps_data = bridge_tunnel_header;
 543                 encaps_len = sizeof(bridge_tunnel_header);
 544                 skip_header_bytes -= 2;
 545         } else if (ethertype >= ETH_P_802_3_MIN) {
 546                 encaps_data = rfc1042_header;
 547                 encaps_len = sizeof(rfc1042_header);
 548                 skip_header_bytes -= 2;
 549         } else {
 550                 encaps_data = NULL;
 551                 encaps_len = 0;
 552         }
 553
 554         skb_pull(skb, skip_header_bytes);
 555         nh_pos -= skip_header_bytes;
 556         h_pos -= skip_header_bytes;
 557
 558         head_need = hdrlen + encaps_len - skb_headroom(skb);
 559
 560         if (head_need > 0 || skb_cloned(skb)) {
 561                 head_need = max(head_need, 0);
 562                 if (head_need)
 563                         skb_orphan(skb);
 564
 565                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 566                         return -ENOMEM;
 567
 568                 skb->truesize += head_need;
 569         }
 570
 571         if (encaps_data) {
 572                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 573                 nh_pos += encaps_len;
 574                 h_pos += encaps_len;
 575         }
 576
 577         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 578
 579         nh_pos += hdrlen;
 580         h_pos += hdrlen;
 581
 582         /* Update skb pointers to various headers since this modified frame
 583          * is going to go through Linux networking code that may potentially
 584          * need things like pointer to IP header. */
 585         skb_set_mac_header(skb, 0);
 586         skb_set_network_header(skb, nh_pos);
 587         skb_set_transport_header(skb, h_pos);
 588
 589         return 0;
 590 }
 591 EXPORT_SYMBOL(ieee80211_data_from_8023);
 592
 593
 594 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 595                               const u8 *addr, enum nl80211_iftype iftype,
 596                               const unsigned int extra_headroom,
 597                               bool has_80211_header)
 598 {
 599         struct sk_buff *frame = NULL;
 600         u16 ethertype;
 601         u8 *payload;
 602         const struct ethhdr *eth;
 603         int remaining, err;
 604         u8 dst[ETH_ALEN], src[ETH_ALEN];
 605
 606         if (has_80211_header) {
 607                 err = ieee80211_data_to_8023(skb, addr, iftype);
 608                 if (err)
 609                         goto out;
 610
 611                 /* skip the wrapping header */
 612                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 613                 if (!eth)
 614                         goto out;
 615         } else {
 616                 eth = (struct ethhdr *) skb->data;
 617         }
 618
 619         while (skb != frame) {
 620                 u8 padding;
 621                 __be16 len = eth->h_proto;
 622                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 623
 624                 remaining = skb->len;
 625                 memcpy(dst, eth->h_dest, ETH_ALEN);
 626                 memcpy(src, eth->h_source, ETH_ALEN);
 627
 628                 padding = (4 - subframe_len) & 0x3;
 629                 /* the last MSDU has no padding */
 630                 if (subframe_len > remaining)
 631                         goto purge;
 632
 633                 skb_pull(skb, sizeof(struct ethhdr));
 634                 /* reuse skb for the last subframe */
 635                 if (remaining <= subframe_len + padding)
 636                         frame = skb;
 637                 else {
 638                         unsigned int hlen = ALIGN(extra_headroom, 4);
 639                         /*
 640                          * Allocate and reserve two bytes more for payload
 641                          * alignment since sizeof(struct ethhdr) is 14.
 642                          */
 643                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 644                         if (!frame)
 645                                 goto purge;
 646
 647                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 648                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 649                                 ntohs(len));
 650
 651                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 652                                                         padding);
 653                         if (!eth) {
 654                                 dev_kfree_skb(frame);
 655                                 goto purge;
 656                         }
 657                 }
 658
 659                 skb_reset_network_header(frame);
 660                 frame->dev = skb->dev;
 661                 frame->priority = skb->priority;
 662
 663                 payload = frame->data;
 664                 ethertype = (payload[6] << 8) | payload[7];
 665
 666                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 667                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 668                            ether_addr_equal(payload, bridge_tunnel_header))) {
 669                         /* remove RFC1042 or Bridge-Tunnel
 670                          * encapsulation and replace EtherType */
 671                         skb_pull(frame, 6);
 672                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 673                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 674                 } else {
 675                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 676                                 sizeof(__be16));
 677                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 678                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 679                 }
 680                 __skb_queue_tail(list, frame);
 681         }
 682
 683         return;
 684
 685  purge:
 686         __skb_queue_purge(list);
 687  out:
 688         dev_kfree_skb(skb);
 689 }
 690 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 691
 692 /* Given a data frame determine the 802.1p/1d tag to use. */
 693 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 694                                     struct cfg80211_qos_map *qos_map)
 695 {
 696         unsigned int dscp;
 697         unsigned char vlan_priority;
 698
 699         /* skb->priority values from 256->263 are magic values to
 700          * directly indicate a specific 802.1d priority.  This is used
 701          * to allow 802.1d priority to be passed directly in from VLAN
 702          * tags, etc.
 703          */
 704         if (skb->priority >= 256 && skb->priority <= 263)
 705                 return skb->priority - 256;
 706
 707         if (vlan_tx_tag_present(skb)) {
 708                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
 709                         >> VLAN_PRIO_SHIFT;
 710                 if (vlan_priority > 0)
 711                         return vlan_priority;
 712         }
 713
 714         switch (skb->protocol) {
 715         case htons(ETH_P_IP):
 716                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 717                 break;
 718         case htons(ETH_P_IPV6):
 719                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 720                 break;
 721         case htons(ETH_P_MPLS_UC):
 722         case htons(ETH_P_MPLS_MC): {
 723                 struct mpls_label mpls_tmp, *mpls;
 724
 725                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 726                                           sizeof(*mpls), &mpls_tmp);
 727                 if (!mpls)
 728                         return 0;
 729
 730                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 731                         >> MPLS_LS_TC_SHIFT;
 732         }
 733         case htons(ETH_P_80221):
 734                 /* 802.21 is always network control traffic */
 735                 return 7;
 736         default:
 737                 return 0;
 738         }
 739
 740         if (qos_map) {
 741                 unsigned int i, tmp_dscp = dscp >> 2;
 742
 743                 for (i = 0; i < qos_map->num_des; i++) {
 744                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 745                                 return qos_map->dscp_exception[i].up;
 746                 }
 747
 748                 for (i = 0; i < 8; i++) {
 749                         if (tmp_dscp >= qos_map->up[i].low &&
 750                             tmp_dscp <= qos_map->up[i].high)
 751                                 return i;
 752                 }
 753         }
 754
 755         return dscp >> 5;
 756 }
 757 EXPORT_SYMBOL(cfg80211_classify8021d);
 758
 759 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 760 {
 761         const struct cfg80211_bss_ies *ies;
 762
 763         ies = rcu_dereference(bss->ies);
 764         if (!ies)
 765                 return NULL;
 766
 767         return cfg80211_find_ie(ie, ies->data, ies->len);
 768 }
 769 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 770
 771 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 772 {
 773         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 774         struct net_device *dev = wdev->netdev;
 775         int i;
 776
 777         if (!wdev->connect_keys)
 778                 return;
 779
 780         for (i = 0; i < 6; i++) {
 781                 if (!wdev->connect_keys->params[i].cipher)
 782                         continue;
 783                 if (rdev_add_key(rdev, dev, i, false, NULL,
 784                                  &wdev->connect_keys->params[i])) {
 785                         netdev_err(dev, "failed to set key %d\n", i);
 786                         continue;
 787                 }
 788                 if (wdev->connect_keys->def == i)
 789                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 790                                 netdev_err(dev, "failed to set defkey %d\n", i);
 791                                 continue;
 792                         }
 793                 if (wdev->connect_keys->defmgmt == i)
 794                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 795                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 796         }
 797
 798         kfree(wdev->connect_keys);
 799         wdev->connect_keys = NULL;
 800 }
 801
 802 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 803 {
 804         struct cfg80211_event *ev;
 805         unsigned long flags;
 806         const u8 *bssid = NULL;
 807
 808         spin_lock_irqsave(&wdev->event_lock, flags);
 809         while (!list_empty(&wdev->event_list)) {
 810                 ev = list_first_entry(&wdev->event_list,
 811                                       struct cfg80211_event, list);
 812                 list_del(&ev->list);
 813                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 814
 815                 wdev_lock(wdev);
 816                 switch (ev->type) {
 817                 case EVENT_CONNECT_RESULT:
 818                         if (!is_zero_ether_addr(ev->cr.bssid))
 819                                 bssid = ev->cr.bssid;
 820                         __cfg80211_connect_result(
 821                                 wdev->netdev, bssid,
 822                                 ev->cr.req_ie, ev->cr.req_ie_len,
 823                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 824                                 ev->cr.status,
 825                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 826                                 NULL);
 827                         break;
 828                 case EVENT_ROAMED:
 829                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 830                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 831                                           ev->rm.resp_ie_len);
 832                         break;
 833                 case EVENT_DISCONNECTED:
 834                         __cfg80211_disconnected(wdev->netdev,
 835                                                 ev->dc.ie, ev->dc.ie_len,
 836                                                 ev->dc.reason, true);
 837                         break;
 838                 case EVENT_IBSS_JOINED:
 839                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 840                                                ev->ij.channel);
 841                         break;
 842                 case EVENT_STOPPED:
 843                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 844                         break;
 845                 }
 846                 wdev_unlock(wdev);
 847
 848                 kfree(ev);
 849
 850                 spin_lock_irqsave(&wdev->event_lock, flags);
 851         }
 852         spin_unlock_irqrestore(&wdev->event_lock, flags);
 853 }
 854
 855 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 856 {
 857         struct wireless_dev *wdev;
 858
 859         ASSERT_RTNL();
 860
 861         list_for_each_entry(wdev, &rdev->wdev_list, list)
 862                 cfg80211_process_wdev_events(wdev);
 863 }
 864
 865 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 866                           struct net_device *dev, enum nl80211_iftype ntype,
 867                           u32 *flags, struct vif_params *params)
 868 {
 869         int err;
 870         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 871
 872         ASSERT_RTNL();
 873
 874         /* don't support changing VLANs, you just re-create them */
 875         if (otype == NL80211_IFTYPE_AP_VLAN)
 876                 return -EOPNOTSUPP;
 877
 878         /* cannot change into P2P device type */
 879         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 880                 return -EOPNOTSUPP;
 881
 882         if (!rdev->ops->change_virtual_intf ||
 883             !(rdev->wiphy.interface_modes & (1 << ntype)))
 884                 return -EOPNOTSUPP;
 885
 886         /* if it's part of a bridge, reject changing type to station/ibss */
 887         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 888             (ntype == NL80211_IFTYPE_ADHOC ||
 889              ntype == NL80211_IFTYPE_STATION ||
 890              ntype == NL80211_IFTYPE_P2P_CLIENT))
 891                 return -EBUSY;
 892
 893         if (ntype != otype && netif_running(dev)) {
 894                 dev->ieee80211_ptr->use_4addr = false;
 895                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 896                 wdev_lock(dev->ieee80211_ptr);
 897                 rdev_set_qos_map(rdev, dev, NULL);
 898                 wdev_unlock(dev->ieee80211_ptr);
 899
 900                 switch (otype) {
 901                 case NL80211_IFTYPE_AP:
 902                         cfg80211_stop_ap(rdev, dev, true);
 903                         break;
 904                 case NL80211_IFTYPE_ADHOC:
 905                         cfg80211_leave_ibss(rdev, dev, false);
 906                         break;
 907                 case NL80211_IFTYPE_STATION:
 908                 case NL80211_IFTYPE_P2P_CLIENT:
 909                         wdev_lock(dev->ieee80211_ptr);
 910                         cfg80211_disconnect(rdev, dev,
 911                                             WLAN_REASON_DEAUTH_LEAVING, true);
 912                         wdev_unlock(dev->ieee80211_ptr);
 913                         break;
 914                 case NL80211_IFTYPE_MESH_POINT:
 915                         /* mesh should be handled? */
 916                         break;
 917                 default:
 918                         break;
 919                 }
 920
 921                 cfg80211_process_rdev_events(rdev);
 922         }
 923
 924         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 925
 926         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 927
 928         if (!err && params && params->use_4addr != -1)
 929                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 930
 931         if (!err) {
 932                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 933                 switch (ntype) {
 934                 case NL80211_IFTYPE_STATION:
 935                         if (dev->ieee80211_ptr->use_4addr)
 936                                 break;
 937                         /* fall through */
 938                 case NL80211_IFTYPE_P2P_CLIENT:
 939                 case NL80211_IFTYPE_ADHOC:
 940                         dev->priv_flags |= IFF_DONT_BRIDGE;
 941                         break;
 942                 case NL80211_IFTYPE_P2P_GO:
 943                 case NL80211_IFTYPE_AP:
 944                 case NL80211_IFTYPE_AP_VLAN:
 945                 case NL80211_IFTYPE_WDS:
 946                 case NL80211_IFTYPE_MESH_POINT:
 947                         /* bridging OK */
 948                         break;
 949                 case NL80211_IFTYPE_MONITOR:
 950                         /* monitor can't bridge anyway */
 951                         break;
 952                 case NL80211_IFTYPE_UNSPECIFIED:
 953                 case NUM_NL80211_IFTYPES:
 954                         /* not happening */
 955                         break;
 956                 case NL80211_IFTYPE_P2P_DEVICE:
 957                         WARN_ON(1);
 958                         break;
 959                 }
 960         }
 961
 962         if (!err && ntype != otype && netif_running(dev)) {
 963                 cfg80211_update_iface_num(rdev, ntype, 1);
 964                 cfg80211_update_iface_num(rdev, otype, -1);
 965         }
 966
 967         return err;
 968 }
 969
 970 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 971 {
 972         static const u32 __mcs2bitrate[] = {
 973                 /* control PHY */
 974                 [0] =   275,
 975                 /* SC PHY */
 976                 [1] =  3850,
 977                 [2] =  7700,
 978                 [3] =  9625,
 979                 [4] = 11550,
 980                 [5] = 12512, /* 1251.25 mbps */
 981                 [6] = 15400,
 982                 [7] = 19250,
 983                 [8] = 23100,
 984                 [9] = 25025,
 985                 [10] = 30800,
 986                 [11] = 38500,
 987                 [12] = 46200,
 988                 /* OFDM PHY */
 989                 [13] =  6930,
 990                 [14] =  8662, /* 866.25 mbps */
 991                 [15] = 13860,
 992                 [16] = 17325,
 993                 [17] = 20790,
 994                 [18] = 27720,
 995                 [19] = 34650,
 996                 [20] = 41580,
 997                 [21] = 45045,
 998                 [22] = 51975,
 999                 [23] = 62370,
1000                 [24] = 67568, /* 6756.75 mbps */
1001                 /* LP-SC PHY */
1002                 [25] =  6260,
1003                 [26] =  8340,
1004                 [27] = 11120,
1005                 [28] = 12510,
1006                 [29] = 16680,
1007                 [30] = 22240,
1008                 [31] = 25030,
1009         };
1010
1011         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1012                 return 0;
1013
1014         return __mcs2bitrate[rate->mcs];
1015 }
1016
1017 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1018 {
1019         static const u32 base[4][10] = {
1020                 {   6500000,
1021                    13000000,
1022                    19500000,
1023                    26000000,
1024                    39000000,
1025                    52000000,
1026                    58500000,
1027                    65000000,
1028                    78000000,
1029                    0,
1030                 },
1031                 {  13500000,
1032                    27000000,
1033                    40500000,
1034                    54000000,
1035                    81000000,
1036                   108000000,
1037                   121500000,
1038                   135000000,
1039                   162000000,
1040                   180000000,
1041                 },
1042                 {  29300000,
1043                    58500000,
1044                    87800000,
1045                   117000000,
1046                   175500000,
1047                   234000000,
1048                   263300000,
1049                   292500000,
1050                   351000000,
1051                   390000000,
1052                 },
1053                 {  58500000,
1054                   117000000,
1055                   175500000,
1056                   234000000,
1057                   351000000,
1058                   468000000,
1059                   526500000,
1060                   585000000,
1061                   702000000,
1062                   780000000,
1063                 },
1064         };
1065         u32 bitrate;
1066         int idx;
1067
1068         if (WARN_ON_ONCE(rate->mcs > 9))
1069                 return 0;
1070
1071         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1072                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1073                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1074                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1075
1076         bitrate = base[idx][rate->mcs];
1077         bitrate *= rate->nss;
1078
1079         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1080                 bitrate = (bitrate / 9) * 10;
1081
1082         /* do NOT round down here */
1083         return (bitrate + 50000) / 100000;
1084 }
1085
1086 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1087 {
1088         int modulation, streams, bitrate;
1089
1090         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1091             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1092                 return rate->legacy;
1093         if (rate->flags & RATE_INFO_FLAGS_60G)
1094                 return cfg80211_calculate_bitrate_60g(rate);
1095         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1096                 return cfg80211_calculate_bitrate_vht(rate);
1097
1098         /* the formula below does only work for MCS values smaller than 32 */
1099         if (WARN_ON_ONCE(rate->mcs >= 32))
1100                 return 0;
1101
1102         modulation = rate->mcs & 7;
1103         streams = (rate->mcs >> 3) + 1;
1104
1105         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1106                         13500000 : 6500000;
1107
1108         if (modulation < 4)
1109                 bitrate *= (modulation + 1);
1110         else if (modulation == 4)
1111                 bitrate *= (modulation + 2);
1112         else
1113                 bitrate *= (modulation + 3);
1114
1115         bitrate *= streams;
1116
1117         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1118                 bitrate = (bitrate / 9) * 10;
1119
1120         /* do NOT round down here */
1121         return (bitrate + 50000) / 100000;
1122 }
1123 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1124
1125 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1126                           enum ieee80211_p2p_attr_id attr,
1127                           u8 *buf, unsigned int bufsize)
1128 {
1129         u8 *out = buf;
1130         u16 attr_remaining = 0;
1131         bool desired_attr = false;
1132         u16 desired_len = 0;
1133
1134         while (len > 0) {
1135                 unsigned int iedatalen;
1136                 unsigned int copy;
1137                 const u8 *iedata;
1138
1139                 if (len < 2)
1140                         return -EILSEQ;
1141                 iedatalen = ies[1];
1142                 if (iedatalen + 2 > len)
1143                         return -EILSEQ;
1144
1145                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1146                         goto cont;
1147
1148                 if (iedatalen < 4)
1149                         goto cont;
1150
1151                 iedata = ies + 2;
1152
1153                 /* check WFA OUI, P2P subtype */
1154                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1155                     iedata[2] != 0x9a || iedata[3] != 0x09)
1156                         goto cont;
1157
1158                 iedatalen -= 4;
1159                 iedata += 4;
1160
1161                 /* check attribute continuation into this IE */
1162                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1163                 if (copy && desired_attr) {
1164                         desired_len += copy;
1165                         if (out) {
1166                                 memcpy(out, iedata, min(bufsize, copy));
1167                                 out += min(bufsize, copy);
1168                                 bufsize -= min(bufsize, copy);
1169                         }
1170
1171
1172                         if (copy == attr_remaining)
1173                                 return desired_len;
1174                 }
1175
1176                 attr_remaining -= copy;
1177                 if (attr_remaining)
1178                         goto cont;
1179
1180                 iedatalen -= copy;
1181                 iedata += copy;
1182
1183                 while (iedatalen > 0) {
1184                         u16 attr_len;
1185
1186                         /* P2P attribute ID & size must fit */
1187                         if (iedatalen < 3)
1188                                 return -EILSEQ;
1189                         desired_attr = iedata[0] == attr;
1190                         attr_len = get_unaligned_le16(iedata + 1);
1191                         iedatalen -= 3;
1192                         iedata += 3;
1193
1194                         copy = min_t(unsigned int, attr_len, iedatalen);
1195
1196                         if (desired_attr) {
1197                                 desired_len += copy;
1198                                 if (out) {
1199                                         memcpy(out, iedata, min(bufsize, copy));
1200                                         out += min(bufsize, copy);
1201                                         bufsize -= min(bufsize, copy);
1202                                 }
1203
1204                                 if (copy == attr_len)
1205                                         return desired_len;
1206                         }
1207
1208                         iedata += copy;
1209                         iedatalen -= copy;
1210                         attr_remaining = attr_len - copy;
1211                 }
1212
1213  cont:
1214                 len -= ies[1] + 2;
1215                 ies += ies[1] + 2;
1216         }
1217
1218         if (attr_remaining && desired_attr)
1219                 return -EILSEQ;
1220
1221         return -ENOENT;
1222 }
1223 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1224
1225 bool ieee80211_operating_class_to_band(u8 operating_class,
1226                                        enum ieee80211_band *band)
1227 {
1228         switch (operating_class) {
1229         case 112:
1230         case 115 ... 127:
1231                 *band = IEEE80211_BAND_5GHZ;
1232                 return true;
1233         case 81:
1234         case 82:
1235         case 83:
1236         case 84:
1237                 *band = IEEE80211_BAND_2GHZ;
1238                 return true;
1239         case 180:
1240                 *band = IEEE80211_BAND_60GHZ;
1241                 return true;
1242         }
1243
1244         return false;
1245 }
1246 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1247
1248 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1249                                  u32 beacon_int)
1250 {
1251         struct wireless_dev *wdev;
1252         int res = 0;
1253
1254         if (!beacon_int)
1255                 return -EINVAL;
1256
1257         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1258                 if (!wdev->beacon_interval)
1259                         continue;
1260                 if (wdev->beacon_interval != beacon_int) {
1261                         res = -EINVAL;
1262                         break;
1263                 }
1264         }
1265
1266         return res;
1267 }
1268
1269 int cfg80211_iter_combinations(struct wiphy *wiphy,
1270                                const int num_different_channels,
1271                                const u8 radar_detect,
1272                                const int iftype_num[NUM_NL80211_IFTYPES],
1273                                void (*iter)(const struct ieee80211_iface_combination *c,
1274                                             void *data),
1275                                void *data)
1276 {
1277         int i, j, iftype;
1278         int num_interfaces = 0;
1279         u32 used_iftypes = 0;
1280
1281         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1282                 num_interfaces += iftype_num[iftype];
1283                 if (iftype_num[iftype] > 0 &&
1284                     !(wiphy->software_iftypes & BIT(iftype)))
1285                         used_iftypes |= BIT(iftype);
1286         }
1287
1288         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1289                 const struct ieee80211_iface_combination *c;
1290                 struct ieee80211_iface_limit *limits;
1291                 u32 all_iftypes = 0;
1292
1293                 c = &wiphy->iface_combinations[i];
1294
1295                 if (num_interfaces > c->max_interfaces)
1296                         continue;
1297                 if (num_different_channels > c->num_different_channels)
1298                         continue;
1299
1300                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1301                                  GFP_KERNEL);
1302                 if (!limits)
1303                         return -ENOMEM;
1304
1305                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1306                         if (wiphy->software_iftypes & BIT(iftype))
1307                                 continue;
1308                         for (j = 0; j < c->n_limits; j++) {
1309                                 all_iftypes |= limits[j].types;
1310                                 if (!(limits[j].types & BIT(iftype)))
1311                                         continue;
1312                                 if (limits[j].max < iftype_num[iftype])
1313                                         goto cont;
1314                                 limits[j].max -= iftype_num[iftype];
1315                         }
1316                 }
1317
1318                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1319                         goto cont;
1320
1321                 /* Finally check that all iftypes that we're currently
1322                  * using are actually part of this combination. If they
1323                  * aren't then we can't use this combination and have
1324                  * to continue to the next.
1325                  */
1326                 if ((all_iftypes & used_iftypes) != used_iftypes)
1327                         goto cont;
1328
1329                 /* This combination covered all interface types and
1330                  * supported the requested numbers, so we're good.
1331                  */
1332
1333                 (*iter)(c, data);
1334  cont:
1335                 kfree(limits);
1336         }
1337
1338         return 0;
1339 }
1340 EXPORT_SYMBOL(cfg80211_iter_combinations);
1341
1342 static void
1343 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1344                           void *data)
1345 {
1346         int *num = data;
1347         (*num)++;
1348 }
1349
1350 int cfg80211_check_combinations(struct wiphy *wiphy,
1351                                 const int num_different_channels,
1352                                 const u8 radar_detect,
1353                                 const int iftype_num[NUM_NL80211_IFTYPES])
1354 {
1355         int err, num = 0;
1356
1357         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1358                                          radar_detect, iftype_num,
1359                                          cfg80211_iter_sum_ifcombs, &num);
1360         if (err)
1361                 return err;
1362         if (num == 0)
1363                 return -EBUSY;
1364
1365         return 0;
1366 }
1367 EXPORT_SYMBOL(cfg80211_check_combinations);
1368
1369 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1370                                  struct wireless_dev *wdev,
1371                                  enum nl80211_iftype iftype,
1372                                  struct ieee80211_channel *chan,
1373                                  enum cfg80211_chan_mode chanmode,
1374                                  u8 radar_detect)
1375 {
1376         struct wireless_dev *wdev_iter;
1377         int num[NUM_NL80211_IFTYPES];
1378         struct ieee80211_channel
1379                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1380         struct ieee80211_channel *ch;
1381         enum cfg80211_chan_mode chmode;
1382         int num_different_channels = 0;
1383         int total = 1;
1384         int i;
1385
1386         ASSERT_RTNL();
1387
1388         if (WARN_ON(hweight32(radar_detect) > 1))
1389                 return -EINVAL;
1390
1391         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1392                 return -EINVAL;
1393
1394         /* Always allow software iftypes */
1395         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1396                 if (radar_detect)
1397                         return -EINVAL;
1398                 return 0;
1399         }
1400
1401         memset(num, 0, sizeof(num));
1402         memset(used_channels, 0, sizeof(used_channels));
1403
1404         num[iftype] = 1;
1405
1406         /* TODO: We'll probably not need this anymore, since this
1407          * should only be called with CHAN_MODE_UNDEFINED. There are
1408          * still a couple of pending calls where other chanmodes are
1409          * used, but we should get rid of them.
1410          */
1411         switch (chanmode) {
1412         case CHAN_MODE_UNDEFINED:
1413                 break;
1414         case CHAN_MODE_SHARED:
1415                 WARN_ON(!chan);
1416                 used_channels[0] = chan;
1417                 num_different_channels++;
1418                 break;
1419         case CHAN_MODE_EXCLUSIVE:
1420                 num_different_channels++;
1421                 break;
1422         }
1423
1424         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1425                 if (wdev_iter == wdev)
1426                         continue;
1427                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1428                         if (!wdev_iter->p2p_started)
1429                                 continue;
1430                 } else if (wdev_iter->netdev) {
1431                         if (!netif_running(wdev_iter->netdev))
1432                                 continue;
1433                 } else {
1434                         WARN_ON(1);
1435                 }
1436
1437                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1438                         continue;
1439
1440                 /*
1441                  * We may be holding the "wdev" mutex, but now need to lock
1442                  * wdev_iter. This is OK because once we get here wdev_iter
1443                  * is not wdev (tested above), but we need to use the nested
1444                  * locking for lockdep.
1445                  */
1446                 mutex_lock_nested(&wdev_iter->mtx, 1);
1447                 __acquire(wdev_iter->mtx);
1448                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1449                 wdev_unlock(wdev_iter);
1450
1451                 switch (chmode) {
1452                 case CHAN_MODE_UNDEFINED:
1453                         break;
1454                 case CHAN_MODE_SHARED:
1455                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1456                                 if (!used_channels[i] || used_channels[i] == ch)
1457                                         break;
1458
1459                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1460                                 return -EBUSY;
1461
1462                         if (used_channels[i] == NULL) {
1463                                 used_channels[i] = ch;
1464                                 num_different_channels++;
1465                         }
1466                         break;
1467                 case CHAN_MODE_EXCLUSIVE:
1468                         num_different_channels++;
1469                         break;
1470                 }
1471
1472                 num[wdev_iter->iftype]++;
1473                 total++;
1474         }
1475
1476         if (total == 1 && !radar_detect)
1477                 return 0;
1478
1479         return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1480                                            radar_detect, num);
1481 }
1482
1483 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1484                            const u8 *rates, unsigned int n_rates,
1485                            u32 *mask)
1486 {
1487         int i, j;
1488
1489         if (!sband)
1490                 return -EINVAL;
1491
1492         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1493                 return -EINVAL;
1494
1495         *mask = 0;
1496
1497         for (i = 0; i < n_rates; i++) {
1498                 int rate = (rates[i] & 0x7f) * 5;
1499                 bool found = false;
1500
1501                 for (j = 0; j < sband->n_bitrates; j++) {
1502                         if (sband->bitrates[j].bitrate == rate) {
1503                                 found = true;
1504                                 *mask |= BIT(j);
1505                                 break;
1506                         }
1507                 }
1508                 if (!found)
1509                         return -EINVAL;
1510         }
1511
1512         /*
1513          * mask must have at least one bit set here since we
1514          * didn't accept a 0-length rates array nor allowed
1515          * entries in the array that didn't exist
1516          */
1517
1518         return 0;
1519 }
1520
1521 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1522 {
1523         enum ieee80211_band band;
1524         unsigned int n_channels = 0;
1525
1526         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1527                 if (wiphy->bands[band])
1528                         n_channels += wiphy->bands[band]->n_channels;
1529
1530         return n_channels;
1531 }
1532 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1533
1534 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1535 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1536 const unsigned char rfc1042_header[] __aligned(2) =
1537         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1538 EXPORT_SYMBOL(rfc1042_header);
1539
1540 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1541 const unsigned char bridge_tunnel_header[] __aligned(2) =
1542         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1543 EXPORT_SYMBOL(bridge_tunnel_header);