net/wireless/util.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Wireless utility functions
   4  *
   5  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  */
   8 #include <linux/export.h>
   9 #include <linux/bitops.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/slab.h>
  12 #include <net/cfg80211.h>
  13 #include <net/ip.h>
  14 #include <net/dsfield.h>
  15 #include <linux/if_vlan.h>
  16 #include <linux/mpls.h>
  17 #include <linux/gcd.h>
  18 #include "core.h"
  19 #include "rdev-ops.h"
  20
  21
  22 struct ieee80211_rate *
  23 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  24                             u32 basic_rates, int bitrate)
  25 {
  26         struct ieee80211_rate *result = &sband->bitrates[0];
  27         int i;
  28
  29         for (i = 0; i < sband->n_bitrates; i++) {
  30                 if (!(basic_rates & BIT(i)))
  31                         continue;
  32                 if (sband->bitrates[i].bitrate > bitrate)
  33                         continue;
  34                 result = &sband->bitrates[i];
  35         }
  36
  37         return result;
  38 }
  39 EXPORT_SYMBOL(ieee80211_get_response_rate);
  40
  41 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  42                               enum nl80211_bss_scan_width scan_width)
  43 {
  44         struct ieee80211_rate *bitrates;
  45         u32 mandatory_rates = 0;
  46         enum ieee80211_rate_flags mandatory_flag;
  47         int i;
  48
  49         if (WARN_ON(!sband))
  50                 return 1;
  51
  52         if (sband->band == NL80211_BAND_2GHZ) {
  53                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  54                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  55                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  56                 else
  57                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  58         } else {
  59                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  60         }
  61
  62         bitrates = sband->bitrates;
  63         for (i = 0; i < sband->n_bitrates; i++)
  64                 if (bitrates[i].flags & mandatory_flag)
  65                         mandatory_rates |= BIT(i);
  66         return mandatory_rates;
  67 }
  68 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  69
  70 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  71 {
  72         /* see 802.11 17.3.8.3.2 and Annex J
  73          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  74         if (chan <= 0)
  75                 return 0; /* not supported */
  76         switch (band) {
  77         case NL80211_BAND_2GHZ:
  78                 if (chan == 14)
  79                         return 2484;
  80                 else if (chan < 14)
  81                         return 2407 + chan * 5;
  82                 break;
  83         case NL80211_BAND_5GHZ:
  84                 if (chan >= 182 && chan <= 196)
  85                         return 4000 + chan * 5;
  86                 else
  87                         return 5000 + chan * 5;
  88                 break;
  89         case NL80211_BAND_60GHZ:
  90                 if (chan < 5)
  91                         return 56160 + chan * 2160;
  92                 break;
  93         default:
  94                 ;
  95         }
  96         return 0; /* not supported */
  97 }
  98 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  99
 100 int ieee80211_frequency_to_channel(int freq)
 101 {
 102         /* see 802.11 17.3.8.3.2 and Annex J */
 103         if (freq == 2484)
 104                 return 14;
 105         else if (freq < 2484)
 106                 return (freq - 2407) / 5;
 107         else if (freq >= 4910 && freq <= 4980)
 108                 return (freq - 4000) / 5;
 109         else if (freq <= 45000) /* DMG band lower limit */
 110                 return (freq - 5000) / 5;
 111         else if (freq >= 58320 && freq <= 64800)
 112                 return (freq - 56160) / 2160;
 113         else
 114                 return 0;
 115 }
 116 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 117
 118 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
 119 {
 120         enum nl80211_band band;
 121         struct ieee80211_supported_band *sband;
 122         int i;
 123
 124         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 125                 sband = wiphy->bands[band];
 126
 127                 if (!sband)
 128                         continue;
 129
 130                 for (i = 0; i < sband->n_channels; i++) {
 131                         if (sband->channels[i].center_freq == freq)
 132                                 return &sband->channels[i];
 133                 }
 134         }
 135
 136         return NULL;
 137 }
 138 EXPORT_SYMBOL(ieee80211_get_channel);
 139
 140 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 141 {
 142         int i, want;
 143
 144         switch (sband->band) {
 145         case NL80211_BAND_5GHZ:
 146                 want = 3;
 147                 for (i = 0; i < sband->n_bitrates; i++) {
 148                         if (sband->bitrates[i].bitrate == 60 ||
 149                             sband->bitrates[i].bitrate == 120 ||
 150                             sband->bitrates[i].bitrate == 240) {
 151                                 sband->bitrates[i].flags |=
 152                                         IEEE80211_RATE_MANDATORY_A;
 153                                 want--;
 154                         }
 155                 }
 156                 WARN_ON(want);
 157                 break;
 158         case NL80211_BAND_2GHZ:
 159                 want = 7;
 160                 for (i = 0; i < sband->n_bitrates; i++) {
 161                         switch (sband->bitrates[i].bitrate) {
 162                         case 10:
 163                         case 20:
 164                         case 55:
 165                         case 110:
 166                                 sband->bitrates[i].flags |=
 167                                         IEEE80211_RATE_MANDATORY_B |
 168                                         IEEE80211_RATE_MANDATORY_G;
 169                                 want--;
 170                                 break;
 171                         case 60:
 172                         case 120:
 173                         case 240:
 174                                 sband->bitrates[i].flags |=
 175                                         IEEE80211_RATE_MANDATORY_G;
 176                                 want--;
 177                                 /* fall through */
 178                         default:
 179                                 sband->bitrates[i].flags |=
 180                                         IEEE80211_RATE_ERP_G;
 181                                 break;
 182                         }
 183                 }
 184                 WARN_ON(want != 0 && want != 3);
 185                 break;
 186         case NL80211_BAND_60GHZ:
 187                 /* check for mandatory HT MCS 1..4 */
 188                 WARN_ON(!sband->ht_cap.ht_supported);
 189                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 190                 break;
 191         case NUM_NL80211_BANDS:
 192         default:
 193                 WARN_ON(1);
 194                 break;
 195         }
 196 }
 197
 198 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 199 {
 200         enum nl80211_band band;
 201
 202         for (band = 0; band < NUM_NL80211_BANDS; band++)
 203                 if (wiphy->bands[band])
 204                         set_mandatory_flags_band(wiphy->bands[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 < 0 || 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         switch (params->cipher) {
 230         case WLAN_CIPHER_SUITE_TKIP:
 231         case WLAN_CIPHER_SUITE_CCMP:
 232         case WLAN_CIPHER_SUITE_CCMP_256:
 233         case WLAN_CIPHER_SUITE_GCMP:
 234         case WLAN_CIPHER_SUITE_GCMP_256:
 235                 /* Disallow pairwise keys with non-zero index unless it's WEP
 236                  * or a vendor specific cipher (because current deployments use
 237                  * pairwise WEP keys with non-zero indices and for vendor
 238                  * specific ciphers this should be validated in the driver or
 239                  * hardware level - but 802.11i clearly specifies to use zero)
 240                  */
 241                 if (pairwise && key_idx)
 242                         return -EINVAL;
 243                 break;
 244         case WLAN_CIPHER_SUITE_AES_CMAC:
 245         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 246         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 247         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 248                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 249                 if (pairwise)
 250                         return -EINVAL;
 251                 if (key_idx < 4)
 252                         return -EINVAL;
 253                 break;
 254         case WLAN_CIPHER_SUITE_WEP40:
 255         case WLAN_CIPHER_SUITE_WEP104:
 256                 if (key_idx > 3)
 257                         return -EINVAL;
 258         default:
 259                 break;
 260         }
 261
 262         switch (params->cipher) {
 263         case WLAN_CIPHER_SUITE_WEP40:
 264                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 265                         return -EINVAL;
 266                 break;
 267         case WLAN_CIPHER_SUITE_TKIP:
 268                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 269                         return -EINVAL;
 270                 break;
 271         case WLAN_CIPHER_SUITE_CCMP:
 272                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 273                         return -EINVAL;
 274                 break;
 275         case WLAN_CIPHER_SUITE_CCMP_256:
 276                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 277                         return -EINVAL;
 278                 break;
 279         case WLAN_CIPHER_SUITE_GCMP:
 280                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 281                         return -EINVAL;
 282                 break;
 283         case WLAN_CIPHER_SUITE_GCMP_256:
 284                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 285                         return -EINVAL;
 286                 break;
 287         case WLAN_CIPHER_SUITE_WEP104:
 288                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 289                         return -EINVAL;
 290                 break;
 291         case WLAN_CIPHER_SUITE_AES_CMAC:
 292                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 293                         return -EINVAL;
 294                 break;
 295         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 296                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 297                         return -EINVAL;
 298                 break;
 299         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 300                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 301                         return -EINVAL;
 302                 break;
 303         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 304                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 305                         return -EINVAL;
 306                 break;
 307         default:
 308                 /*
 309                  * We don't know anything about this algorithm,
 310                  * allow using it -- but the driver must check
 311                  * all parameters! We still check below whether
 312                  * or not the driver supports this algorithm,
 313                  * of course.
 314                  */
 315                 break;
 316         }
 317
 318         if (params->seq) {
 319                 switch (params->cipher) {
 320                 case WLAN_CIPHER_SUITE_WEP40:
 321                 case WLAN_CIPHER_SUITE_WEP104:
 322                         /* These ciphers do not use key sequence */
 323                         return -EINVAL;
 324                 case WLAN_CIPHER_SUITE_TKIP:
 325                 case WLAN_CIPHER_SUITE_CCMP:
 326                 case WLAN_CIPHER_SUITE_CCMP_256:
 327                 case WLAN_CIPHER_SUITE_GCMP:
 328                 case WLAN_CIPHER_SUITE_GCMP_256:
 329                 case WLAN_CIPHER_SUITE_AES_CMAC:
 330                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 331                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 332                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 333                         if (params->seq_len != 6)
 334                                 return -EINVAL;
 335                         break;
 336                 }
 337         }
 338
 339         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 340                 return -EINVAL;
 341
 342         return 0;
 343 }
 344
 345 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 346 {
 347         unsigned int hdrlen = 24;
 348
 349         if (ieee80211_is_data(fc)) {
 350                 if (ieee80211_has_a4(fc))
 351                         hdrlen = 30;
 352                 if (ieee80211_is_data_qos(fc)) {
 353                         hdrlen += IEEE80211_QOS_CTL_LEN;
 354                         if (ieee80211_has_order(fc))
 355                                 hdrlen += IEEE80211_HT_CTL_LEN;
 356                 }
 357                 goto out;
 358         }
 359
 360         if (ieee80211_is_mgmt(fc)) {
 361                 if (ieee80211_has_order(fc))
 362                         hdrlen += IEEE80211_HT_CTL_LEN;
 363                 goto out;
 364         }
 365
 366         if (ieee80211_is_ctl(fc)) {
 367                 /*
 368                  * ACK and CTS are 10 bytes, all others 16. To see how
 369                  * to get this condition consider
 370                  *   subtype mask:   0b0000000011110000 (0x00F0)
 371                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 372                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 373                  *   bits that matter:         ^^^      (0x00E0)
 374                  *   value of those: 0b0000000011000000 (0x00C0)
 375                  */
 376                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 377                         hdrlen = 10;
 378                 else
 379                         hdrlen = 16;
 380         }
 381 out:
 382         return hdrlen;
 383 }
 384 EXPORT_SYMBOL(ieee80211_hdrlen);
 385
 386 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 387 {
 388         const struct ieee80211_hdr *hdr =
 389                         (const struct ieee80211_hdr *)skb->data;
 390         unsigned int hdrlen;
 391
 392         if (unlikely(skb->len < 10))
 393                 return 0;
 394         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 395         if (unlikely(hdrlen > skb->len))
 396                 return 0;
 397         return hdrlen;
 398 }
 399 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 400
 401 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 402 {
 403         int ae = flags & MESH_FLAGS_AE;
 404         /* 802.11-2012, 8.2.4.7.3 */
 405         switch (ae) {
 406         default:
 407         case 0:
 408                 return 6;
 409         case MESH_FLAGS_AE_A4:
 410                 return 12;
 411         case MESH_FLAGS_AE_A5_A6:
 412                 return 18;
 413         }
 414 }
 415
 416 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 417 {
 418         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 419 }
 420 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 421
 422 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 423                                   const u8 *addr, enum nl80211_iftype iftype)
 424 {
 425         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 426         struct {
 427                 u8 hdr[ETH_ALEN] __aligned(2);
 428                 __be16 proto;
 429         } payload;
 430         struct ethhdr tmp;
 431         u16 hdrlen;
 432         u8 mesh_flags = 0;
 433
 434         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 435                 return -1;
 436
 437         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 438         if (skb->len < hdrlen + 8)
 439                 return -1;
 440
 441         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 442          * header
 443          * IEEE 802.11 address fields:
 444          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 445          *   0     0   DA    SA    BSSID n/a
 446          *   0     1   DA    BSSID SA    n/a
 447          *   1     0   BSSID SA    DA    n/a
 448          *   1     1   RA    TA    DA    SA
 449          */
 450         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 451         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 452
 453         if (iftype == NL80211_IFTYPE_MESH_POINT)
 454                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 455
 456         mesh_flags &= MESH_FLAGS_AE;
 457
 458         switch (hdr->frame_control &
 459                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 460         case cpu_to_le16(IEEE80211_FCTL_TODS):
 461                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 462                              iftype != NL80211_IFTYPE_AP_VLAN &&
 463                              iftype != NL80211_IFTYPE_P2P_GO))
 464                         return -1;
 465                 break;
 466         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 467                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 468                              iftype != NL80211_IFTYPE_MESH_POINT &&
 469                              iftype != NL80211_IFTYPE_AP_VLAN &&
 470                              iftype != NL80211_IFTYPE_STATION))
 471                         return -1;
 472                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 473                         if (mesh_flags == MESH_FLAGS_AE_A4)
 474                                 return -1;
 475                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 476                                 skb_copy_bits(skb, hdrlen +
 477                                         offsetof(struct ieee80211s_hdr, eaddr1),
 478                                         tmp.h_dest, 2 * ETH_ALEN);
 479                         }
 480                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 481                 }
 482                 break;
 483         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 484                 if ((iftype != NL80211_IFTYPE_STATION &&
 485                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 486                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 487                     (is_multicast_ether_addr(tmp.h_dest) &&
 488                      ether_addr_equal(tmp.h_source, addr)))
 489                         return -1;
 490                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 491                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 492                                 return -1;
 493                         if (mesh_flags == MESH_FLAGS_AE_A4)
 494                                 skb_copy_bits(skb, hdrlen +
 495                                         offsetof(struct ieee80211s_hdr, eaddr1),
 496                                         tmp.h_source, ETH_ALEN);
 497                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 498                 }
 499                 break;
 500         case cpu_to_le16(0):
 501                 if (iftype != NL80211_IFTYPE_ADHOC &&
 502                     iftype != NL80211_IFTYPE_STATION &&
 503                     iftype != NL80211_IFTYPE_OCB)
 504                                 return -1;
 505                 break;
 506         }
 507
 508         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 509         tmp.h_proto = payload.proto;
 510
 511         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 512                     tmp.h_proto != htons(ETH_P_AARP) &&
 513                     tmp.h_proto != htons(ETH_P_IPX)) ||
 514                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 515                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 516                  * replace EtherType */
 517                 hdrlen += ETH_ALEN + 2;
 518         else
 519                 tmp.h_proto = htons(skb->len - hdrlen);
 520
 521         pskb_pull(skb, hdrlen);
 522
 523         if (!ehdr)
 524                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 525         memcpy(ehdr, &tmp, sizeof(tmp));
 526
 527         return 0;
 528 }
 529 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 530
 531 static void
 532 __frame_add_frag(struct sk_buff *skb, struct page *page,
 533                  void *ptr, int len, int size)
 534 {
 535         struct skb_shared_info *sh = skb_shinfo(skb);
 536         int page_offset;
 537
 538         page_ref_inc(page);
 539         page_offset = ptr - page_address(page);
 540         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 541 }
 542
 543 static void
 544 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 545                             int offset, int len)
 546 {
 547         struct skb_shared_info *sh = skb_shinfo(skb);
 548         const skb_frag_t *frag = &sh->frags[0];
 549         struct page *frag_page;
 550         void *frag_ptr;
 551         int frag_len, frag_size;
 552         int head_size = skb->len - skb->data_len;
 553         int cur_len;
 554
 555         frag_page = virt_to_head_page(skb->head);
 556         frag_ptr = skb->data;
 557         frag_size = head_size;
 558
 559         while (offset >= frag_size) {
 560                 offset -= frag_size;
 561                 frag_page = skb_frag_page(frag);
 562                 frag_ptr = skb_frag_address(frag);
 563                 frag_size = skb_frag_size(frag);
 564                 frag++;
 565         }
 566
 567         frag_ptr += offset;
 568         frag_len = frag_size - offset;
 569
 570         cur_len = min(len, frag_len);
 571
 572         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 573         len -= cur_len;
 574
 575         while (len > 0) {
 576                 frag_len = skb_frag_size(frag);
 577                 cur_len = min(len, frag_len);
 578                 __frame_add_frag(frame, skb_frag_page(frag),
 579                                  skb_frag_address(frag), cur_len, frag_len);
 580                 len -= cur_len;
 581                 frag++;
 582         }
 583 }
 584
 585 static struct sk_buff *
 586 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 587                        int offset, int len, bool reuse_frag)
 588 {
 589         struct sk_buff *frame;
 590         int cur_len = len;
 591
 592         if (skb->len - offset < len)
 593                 return NULL;
 594
 595         /*
 596          * When reusing framents, copy some data to the head to simplify
 597          * ethernet header handling and speed up protocol header processing
 598          * in the stack later.
 599          */
 600         if (reuse_frag)
 601                 cur_len = min_t(int, len, 32);
 602
 603         /*
 604          * Allocate and reserve two bytes more for payload
 605          * alignment since sizeof(struct ethhdr) is 14.
 606          */
 607         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 608         if (!frame)
 609                 return NULL;
 610
 611         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 612         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 613
 614         len -= cur_len;
 615         if (!len)
 616                 return frame;
 617
 618         offset += cur_len;
 619         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 620
 621         return frame;
 622 }
 623
 624 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 625                               const u8 *addr, enum nl80211_iftype iftype,
 626                               const unsigned int extra_headroom,
 627                               const u8 *check_da, const u8 *check_sa)
 628 {
 629         unsigned int hlen = ALIGN(extra_headroom, 4);
 630         struct sk_buff *frame = NULL;
 631         u16 ethertype;
 632         u8 *payload;
 633         int offset = 0, remaining;
 634         struct ethhdr eth;
 635         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 636         bool reuse_skb = false;
 637         bool last = false;
 638
 639         while (!last) {
 640                 unsigned int subframe_len;
 641                 int len;
 642                 u8 padding;
 643
 644                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 645                 len = ntohs(eth.h_proto);
 646                 subframe_len = sizeof(struct ethhdr) + len;
 647                 padding = (4 - subframe_len) & 0x3;
 648
 649                 /* the last MSDU has no padding */
 650                 remaining = skb->len - offset;
 651                 if (subframe_len > remaining)
 652                         goto purge;
 653
 654                 offset += sizeof(struct ethhdr);
 655                 last = remaining <= subframe_len + padding;
 656
 657                 /* FIXME: should we really accept multicast DA? */
 658                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 659                      !ether_addr_equal(check_da, eth.h_dest)) ||
 660                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 661                         offset += len + padding;
 662                         continue;
 663                 }
 664
 665                 /* reuse skb for the last subframe */
 666                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 667                         skb_pull(skb, offset);
 668                         frame = skb;
 669                         reuse_skb = true;
 670                 } else {
 671                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 672                                                        reuse_frag);
 673                         if (!frame)
 674                                 goto purge;
 675
 676                         offset += len + padding;
 677                 }
 678
 679                 skb_reset_network_header(frame);
 680                 frame->dev = skb->dev;
 681                 frame->priority = skb->priority;
 682
 683                 payload = frame->data;
 684                 ethertype = (payload[6] << 8) | payload[7];
 685                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 686                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 687                            ether_addr_equal(payload, bridge_tunnel_header))) {
 688                         eth.h_proto = htons(ethertype);
 689                         skb_pull(frame, ETH_ALEN + 2);
 690                 }
 691
 692                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 693                 __skb_queue_tail(list, frame);
 694         }
 695
 696         if (!reuse_skb)
 697                 dev_kfree_skb(skb);
 698
 699         return;
 700
 701  purge:
 702         __skb_queue_purge(list);
 703         dev_kfree_skb(skb);
 704 }
 705 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 706
 707 /* Given a data frame determine the 802.1p/1d tag to use. */
 708 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 709                                     struct cfg80211_qos_map *qos_map)
 710 {
 711         unsigned int dscp;
 712         unsigned char vlan_priority;
 713
 714         /* skb->priority values from 256->263 are magic values to
 715          * directly indicate a specific 802.1d priority.  This is used
 716          * to allow 802.1d priority to be passed directly in from VLAN
 717          * tags, etc.
 718          */
 719         if (skb->priority >= 256 && skb->priority <= 263)
 720                 return skb->priority - 256;
 721
 722         if (skb_vlan_tag_present(skb)) {
 723                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 724                         >> VLAN_PRIO_SHIFT;
 725                 if (vlan_priority > 0)
 726                         return vlan_priority;
 727         }
 728
 729         switch (skb->protocol) {
 730         case htons(ETH_P_IP):
 731                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 732                 break;
 733         case htons(ETH_P_IPV6):
 734                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 735                 break;
 736         case htons(ETH_P_MPLS_UC):
 737         case htons(ETH_P_MPLS_MC): {
 738                 struct mpls_label mpls_tmp, *mpls;
 739
 740                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 741                                           sizeof(*mpls), &mpls_tmp);
 742                 if (!mpls)
 743                         return 0;
 744
 745                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 746                         >> MPLS_LS_TC_SHIFT;
 747         }
 748         case htons(ETH_P_80221):
 749                 /* 802.21 is always network control traffic */
 750                 return 7;
 751         default:
 752                 return 0;
 753         }
 754
 755         if (qos_map) {
 756                 unsigned int i, tmp_dscp = dscp >> 2;
 757
 758                 for (i = 0; i < qos_map->num_des; i++) {
 759                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 760                                 return qos_map->dscp_exception[i].up;
 761                 }
 762
 763                 for (i = 0; i < 8; i++) {
 764                         if (tmp_dscp >= qos_map->up[i].low &&
 765                             tmp_dscp <= qos_map->up[i].high)
 766                                 return i;
 767                 }
 768         }
 769
 770         return dscp >> 5;
 771 }
 772 EXPORT_SYMBOL(cfg80211_classify8021d);
 773
 774 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 775 {
 776         const struct cfg80211_bss_ies *ies;
 777
 778         ies = rcu_dereference(bss->ies);
 779         if (!ies)
 780                 return NULL;
 781
 782         return cfg80211_find_ie(ie, ies->data, ies->len);
 783 }
 784 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 785
 786 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 787 {
 788         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 789         struct net_device *dev = wdev->netdev;
 790         int i;
 791
 792         if (!wdev->connect_keys)
 793                 return;
 794
 795         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 796                 if (!wdev->connect_keys->params[i].cipher)
 797                         continue;
 798                 if (rdev_add_key(rdev, dev, i, false, NULL,
 799                                  &wdev->connect_keys->params[i])) {
 800                         netdev_err(dev, "failed to set key %d\n", i);
 801                         continue;
 802                 }
 803                 if (wdev->connect_keys->def == i &&
 804                     rdev_set_default_key(rdev, dev, i, true, true)) {
 805                         netdev_err(dev, "failed to set defkey %d\n", i);
 806                         continue;
 807                 }
 808         }
 809
 810         kzfree(wdev->connect_keys);
 811         wdev->connect_keys = NULL;
 812 }
 813
 814 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 815 {
 816         struct cfg80211_event *ev;
 817         unsigned long flags;
 818
 819         spin_lock_irqsave(&wdev->event_lock, flags);
 820         while (!list_empty(&wdev->event_list)) {
 821                 ev = list_first_entry(&wdev->event_list,
 822                                       struct cfg80211_event, list);
 823                 list_del(&ev->list);
 824                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 825
 826                 wdev_lock(wdev);
 827                 switch (ev->type) {
 828                 case EVENT_CONNECT_RESULT:
 829                         __cfg80211_connect_result(
 830                                 wdev->netdev,
 831                                 &ev->cr,
 832                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 833                         break;
 834                 case EVENT_ROAMED:
 835                         __cfg80211_roamed(wdev, &ev->rm);
 836                         break;
 837                 case EVENT_DISCONNECTED:
 838                         __cfg80211_disconnected(wdev->netdev,
 839                                                 ev->dc.ie, ev->dc.ie_len,
 840                                                 ev->dc.reason,
 841                                                 !ev->dc.locally_generated);
 842                         break;
 843                 case EVENT_IBSS_JOINED:
 844                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 845                                                ev->ij.channel);
 846                         break;
 847                 case EVENT_STOPPED:
 848                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 849                         break;
 850                 case EVENT_PORT_AUTHORIZED:
 851                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 852                         break;
 853                 }
 854                 wdev_unlock(wdev);
 855
 856                 kfree(ev);
 857
 858                 spin_lock_irqsave(&wdev->event_lock, flags);
 859         }
 860         spin_unlock_irqrestore(&wdev->event_lock, flags);
 861 }
 862
 863 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 864 {
 865         struct wireless_dev *wdev;
 866
 867         ASSERT_RTNL();
 868
 869         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 870                 cfg80211_process_wdev_events(wdev);
 871 }
 872
 873 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 874                           struct net_device *dev, enum nl80211_iftype ntype,
 875                           struct vif_params *params)
 876 {
 877         int err;
 878         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 879
 880         ASSERT_RTNL();
 881
 882         /* don't support changing VLANs, you just re-create them */
 883         if (otype == NL80211_IFTYPE_AP_VLAN)
 884                 return -EOPNOTSUPP;
 885
 886         /* cannot change into P2P device or NAN */
 887         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 888             ntype == NL80211_IFTYPE_NAN)
 889                 return -EOPNOTSUPP;
 890
 891         if (!rdev->ops->change_virtual_intf ||
 892             !(rdev->wiphy.interface_modes & (1 << ntype)))
 893                 return -EOPNOTSUPP;
 894
 895         /* if it's part of a bridge, reject changing type to station/ibss */
 896         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 897             (ntype == NL80211_IFTYPE_ADHOC ||
 898              ntype == NL80211_IFTYPE_STATION ||
 899              ntype == NL80211_IFTYPE_P2P_CLIENT))
 900                 return -EBUSY;
 901
 902         if (ntype != otype) {
 903                 dev->ieee80211_ptr->use_4addr = false;
 904                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 905                 wdev_lock(dev->ieee80211_ptr);
 906                 rdev_set_qos_map(rdev, dev, NULL);
 907                 wdev_unlock(dev->ieee80211_ptr);
 908
 909                 switch (otype) {
 910                 case NL80211_IFTYPE_AP:
 911                         cfg80211_stop_ap(rdev, dev, true);
 912                         break;
 913                 case NL80211_IFTYPE_ADHOC:
 914                         cfg80211_leave_ibss(rdev, dev, false);
 915                         break;
 916                 case NL80211_IFTYPE_STATION:
 917                 case NL80211_IFTYPE_P2P_CLIENT:
 918                         wdev_lock(dev->ieee80211_ptr);
 919                         cfg80211_disconnect(rdev, dev,
 920                                             WLAN_REASON_DEAUTH_LEAVING, true);
 921                         wdev_unlock(dev->ieee80211_ptr);
 922                         break;
 923                 case NL80211_IFTYPE_MESH_POINT:
 924                         /* mesh should be handled? */
 925                         break;
 926                 default:
 927                         break;
 928                 }
 929
 930                 cfg80211_process_rdev_events(rdev);
 931         }
 932
 933         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 934
 935         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 936
 937         if (!err && params && params->use_4addr != -1)
 938                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 939
 940         if (!err) {
 941                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 942                 switch (ntype) {
 943                 case NL80211_IFTYPE_STATION:
 944                         if (dev->ieee80211_ptr->use_4addr)
 945                                 break;
 946                         /* fall through */
 947                 case NL80211_IFTYPE_OCB:
 948                 case NL80211_IFTYPE_P2P_CLIENT:
 949                 case NL80211_IFTYPE_ADHOC:
 950                         dev->priv_flags |= IFF_DONT_BRIDGE;
 951                         break;
 952                 case NL80211_IFTYPE_P2P_GO:
 953                 case NL80211_IFTYPE_AP:
 954                 case NL80211_IFTYPE_AP_VLAN:
 955                 case NL80211_IFTYPE_WDS:
 956                 case NL80211_IFTYPE_MESH_POINT:
 957                         /* bridging OK */
 958                         break;
 959                 case NL80211_IFTYPE_MONITOR:
 960                         /* monitor can't bridge anyway */
 961                         break;
 962                 case NL80211_IFTYPE_UNSPECIFIED:
 963                 case NUM_NL80211_IFTYPES:
 964                         /* not happening */
 965                         break;
 966                 case NL80211_IFTYPE_P2P_DEVICE:
 967                 case NL80211_IFTYPE_NAN:
 968                         WARN_ON(1);
 969                         break;
 970                 }
 971         }
 972
 973         if (!err && ntype != otype && netif_running(dev)) {
 974                 cfg80211_update_iface_num(rdev, ntype, 1);
 975                 cfg80211_update_iface_num(rdev, otype, -1);
 976         }
 977
 978         return err;
 979 }
 980
 981 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
 982 {
 983         int modulation, streams, bitrate;
 984
 985         /* the formula below does only work for MCS values smaller than 32 */
 986         if (WARN_ON_ONCE(rate->mcs >= 32))
 987                 return 0;
 988
 989         modulation = rate->mcs & 7;
 990         streams = (rate->mcs >> 3) + 1;
 991
 992         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
 993
 994         if (modulation < 4)
 995                 bitrate *= (modulation + 1);
 996         else if (modulation == 4)
 997                 bitrate *= (modulation + 2);
 998         else
 999                 bitrate *= (modulation + 3);
1000
1001         bitrate *= streams;
1002
1003         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1004                 bitrate = (bitrate / 9) * 10;
1005
1006         /* do NOT round down here */
1007         return (bitrate + 50000) / 100000;
1008 }
1009
1010 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1011 {
1012         static const u32 __mcs2bitrate[] = {
1013                 /* control PHY */
1014                 [0] =   275,
1015                 /* SC PHY */
1016                 [1] =  3850,
1017                 [2] =  7700,
1018                 [3] =  9625,
1019                 [4] = 11550,
1020                 [5] = 12512, /* 1251.25 mbps */
1021                 [6] = 15400,
1022                 [7] = 19250,
1023                 [8] = 23100,
1024                 [9] = 25025,
1025                 [10] = 30800,
1026                 [11] = 38500,
1027                 [12] = 46200,
1028                 /* OFDM PHY */
1029                 [13] =  6930,
1030                 [14] =  8662, /* 866.25 mbps */
1031                 [15] = 13860,
1032                 [16] = 17325,
1033                 [17] = 20790,
1034                 [18] = 27720,
1035                 [19] = 34650,
1036                 [20] = 41580,
1037                 [21] = 45045,
1038                 [22] = 51975,
1039                 [23] = 62370,
1040                 [24] = 67568, /* 6756.75 mbps */
1041                 /* LP-SC PHY */
1042                 [25] =  6260,
1043                 [26] =  8340,
1044                 [27] = 11120,
1045                 [28] = 12510,
1046                 [29] = 16680,
1047                 [30] = 22240,
1048                 [31] = 25030,
1049         };
1050
1051         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1052                 return 0;
1053
1054         return __mcs2bitrate[rate->mcs];
1055 }
1056
1057 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1058 {
1059         static const u32 base[4][10] = {
1060                 {   6500000,
1061                    13000000,
1062                    19500000,
1063                    26000000,
1064                    39000000,
1065                    52000000,
1066                    58500000,
1067                    65000000,
1068                    78000000,
1069                 /* not in the spec, but some devices use this: */
1070                    86500000,
1071                 },
1072                 {  13500000,
1073                    27000000,
1074                    40500000,
1075                    54000000,
1076                    81000000,
1077                   108000000,
1078                   121500000,
1079                   135000000,
1080                   162000000,
1081                   180000000,
1082                 },
1083                 {  29300000,
1084                    58500000,
1085                    87800000,
1086                   117000000,
1087                   175500000,
1088                   234000000,
1089                   263300000,
1090                   292500000,
1091                   351000000,
1092                   390000000,
1093                 },
1094                 {  58500000,
1095                   117000000,
1096                   175500000,
1097                   234000000,
1098                   351000000,
1099                   468000000,
1100                   526500000,
1101                   585000000,
1102                   702000000,
1103                   780000000,
1104                 },
1105         };
1106         u32 bitrate;
1107         int idx;
1108
1109         if (rate->mcs > 9)
1110                 goto warn;
1111
1112         switch (rate->bw) {
1113         case RATE_INFO_BW_160:
1114                 idx = 3;
1115                 break;
1116         case RATE_INFO_BW_80:
1117                 idx = 2;
1118                 break;
1119         case RATE_INFO_BW_40:
1120                 idx = 1;
1121                 break;
1122         case RATE_INFO_BW_5:
1123         case RATE_INFO_BW_10:
1124         default:
1125                 goto warn;
1126         case RATE_INFO_BW_20:
1127                 idx = 0;
1128         }
1129
1130         bitrate = base[idx][rate->mcs];
1131         bitrate *= rate->nss;
1132
1133         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1134                 bitrate = (bitrate / 9) * 10;
1135
1136         /* do NOT round down here */
1137         return (bitrate + 50000) / 100000;
1138  warn:
1139         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1140                   rate->bw, rate->mcs, rate->nss);
1141         return 0;
1142 }
1143
1144 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1145 {
1146         if (rate->flags & RATE_INFO_FLAGS_MCS)
1147                 return cfg80211_calculate_bitrate_ht(rate);
1148         if (rate->flags & RATE_INFO_FLAGS_60G)
1149                 return cfg80211_calculate_bitrate_60g(rate);
1150         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1151                 return cfg80211_calculate_bitrate_vht(rate);
1152
1153         return rate->legacy;
1154 }
1155 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1156
1157 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1158                           enum ieee80211_p2p_attr_id attr,
1159                           u8 *buf, unsigned int bufsize)
1160 {
1161         u8 *out = buf;
1162         u16 attr_remaining = 0;
1163         bool desired_attr = false;
1164         u16 desired_len = 0;
1165
1166         while (len > 0) {
1167                 unsigned int iedatalen;
1168                 unsigned int copy;
1169                 const u8 *iedata;
1170
1171                 if (len < 2)
1172                         return -EILSEQ;
1173                 iedatalen = ies[1];
1174                 if (iedatalen + 2 > len)
1175                         return -EILSEQ;
1176
1177                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1178                         goto cont;
1179
1180                 if (iedatalen < 4)
1181                         goto cont;
1182
1183                 iedata = ies + 2;
1184
1185                 /* check WFA OUI, P2P subtype */
1186                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1187                     iedata[2] != 0x9a || iedata[3] != 0x09)
1188                         goto cont;
1189
1190                 iedatalen -= 4;
1191                 iedata += 4;
1192
1193                 /* check attribute continuation into this IE */
1194                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1195                 if (copy && desired_attr) {
1196                         desired_len += copy;
1197                         if (out) {
1198                                 memcpy(out, iedata, min(bufsize, copy));
1199                                 out += min(bufsize, copy);
1200                                 bufsize -= min(bufsize, copy);
1201                         }
1202
1203
1204                         if (copy == attr_remaining)
1205                                 return desired_len;
1206                 }
1207
1208                 attr_remaining -= copy;
1209                 if (attr_remaining)
1210                         goto cont;
1211
1212                 iedatalen -= copy;
1213                 iedata += copy;
1214
1215                 while (iedatalen > 0) {
1216                         u16 attr_len;
1217
1218                         /* P2P attribute ID & size must fit */
1219                         if (iedatalen < 3)
1220                                 return -EILSEQ;
1221                         desired_attr = iedata[0] == attr;
1222                         attr_len = get_unaligned_le16(iedata + 1);
1223                         iedatalen -= 3;
1224                         iedata += 3;
1225
1226                         copy = min_t(unsigned int, attr_len, iedatalen);
1227
1228                         if (desired_attr) {
1229                                 desired_len += copy;
1230                                 if (out) {
1231                                         memcpy(out, iedata, min(bufsize, copy));
1232                                         out += min(bufsize, copy);
1233                                         bufsize -= min(bufsize, copy);
1234                                 }
1235
1236                                 if (copy == attr_len)
1237                                         return desired_len;
1238                         }
1239
1240                         iedata += copy;
1241                         iedatalen -= copy;
1242                         attr_remaining = attr_len - copy;
1243                 }
1244
1245  cont:
1246                 len -= ies[1] + 2;
1247                 ies += ies[1] + 2;
1248         }
1249
1250         if (attr_remaining && desired_attr)
1251                 return -EILSEQ;
1252
1253         return -ENOENT;
1254 }
1255 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1256
1257 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1258 {
1259         int i;
1260
1261         /* Make sure array values are legal */
1262         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1263                 return false;
1264
1265         i = 0;
1266         while (i < n_ids) {
1267                 if (ids[i] == WLAN_EID_EXTENSION) {
1268                         if (id_ext && (ids[i + 1] == id))
1269                                 return true;
1270
1271                         i += 2;
1272                         continue;
1273                 }
1274
1275                 if (ids[i] == id && !id_ext)
1276                         return true;
1277
1278                 i++;
1279         }
1280         return false;
1281 }
1282
1283 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1284 {
1285         /* we assume a validly formed IEs buffer */
1286         u8 len = ies[pos + 1];
1287
1288         pos += 2 + len;
1289
1290         /* the IE itself must have 255 bytes for fragments to follow */
1291         if (len < 255)
1292                 return pos;
1293
1294         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1295                 len = ies[pos + 1];
1296                 pos += 2 + len;
1297         }
1298
1299         return pos;
1300 }
1301
1302 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1303                               const u8 *ids, int n_ids,
1304                               const u8 *after_ric, int n_after_ric,
1305                               size_t offset)
1306 {
1307         size_t pos = offset;
1308
1309         while (pos < ielen) {
1310                 u8 ext = 0;
1311
1312                 if (ies[pos] == WLAN_EID_EXTENSION)
1313                         ext = 2;
1314                 if ((pos + ext) >= ielen)
1315                         break;
1316
1317                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1318                                           ies[pos] == WLAN_EID_EXTENSION))
1319                         break;
1320
1321                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1322                         pos = skip_ie(ies, ielen, pos);
1323
1324                         while (pos < ielen) {
1325                                 if (ies[pos] == WLAN_EID_EXTENSION)
1326                                         ext = 2;
1327                                 else
1328                                         ext = 0;
1329
1330                                 if ((pos + ext) >= ielen)
1331                                         break;
1332
1333                                 if (!ieee80211_id_in_list(after_ric,
1334                                                           n_after_ric,
1335                                                           ies[pos + ext],
1336                                                           ext == 2))
1337                                         pos = skip_ie(ies, ielen, pos);
1338                         }
1339                 } else {
1340                         pos = skip_ie(ies, ielen, pos);
1341                 }
1342         }
1343
1344         return pos;
1345 }
1346 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1347
1348 bool ieee80211_operating_class_to_band(u8 operating_class,
1349                                        enum nl80211_band *band)
1350 {
1351         switch (operating_class) {
1352         case 112:
1353         case 115 ... 127:
1354         case 128 ... 130:
1355                 *band = NL80211_BAND_5GHZ;
1356                 return true;
1357         case 81:
1358         case 82:
1359         case 83:
1360         case 84:
1361                 *band = NL80211_BAND_2GHZ;
1362                 return true;
1363         case 180:
1364                 *band = NL80211_BAND_60GHZ;
1365                 return true;
1366         }
1367
1368         return false;
1369 }
1370 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1371
1372 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1373                                           u8 *op_class)
1374 {
1375         u8 vht_opclass;
1376         u16 freq = chandef->center_freq1;
1377
1378         if (freq >= 2412 && freq <= 2472) {
1379                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1380                         return false;
1381
1382                 /* 2.407 GHz, channels 1..13 */
1383                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1384                         if (freq > chandef->chan->center_freq)
1385                                 *op_class = 83; /* HT40+ */
1386                         else
1387                                 *op_class = 84; /* HT40- */
1388                 } else {
1389                         *op_class = 81;
1390                 }
1391
1392                 return true;
1393         }
1394
1395         if (freq == 2484) {
1396                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1397                         return false;
1398
1399                 *op_class = 82; /* channel 14 */
1400                 return true;
1401         }
1402
1403         switch (chandef->width) {
1404         case NL80211_CHAN_WIDTH_80:
1405                 vht_opclass = 128;
1406                 break;
1407         case NL80211_CHAN_WIDTH_160:
1408                 vht_opclass = 129;
1409                 break;
1410         case NL80211_CHAN_WIDTH_80P80:
1411                 vht_opclass = 130;
1412                 break;
1413         case NL80211_CHAN_WIDTH_10:
1414         case NL80211_CHAN_WIDTH_5:
1415                 return false; /* unsupported for now */
1416         default:
1417                 vht_opclass = 0;
1418                 break;
1419         }
1420
1421         /* 5 GHz, channels 36..48 */
1422         if (freq >= 5180 && freq <= 5240) {
1423                 if (vht_opclass) {
1424                         *op_class = vht_opclass;
1425                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1426                         if (freq > chandef->chan->center_freq)
1427                                 *op_class = 116;
1428                         else
1429                                 *op_class = 117;
1430                 } else {
1431                         *op_class = 115;
1432                 }
1433
1434                 return true;
1435         }
1436
1437         /* 5 GHz, channels 52..64 */
1438         if (freq >= 5260 && freq <= 5320) {
1439                 if (vht_opclass) {
1440                         *op_class = vht_opclass;
1441                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1442                         if (freq > chandef->chan->center_freq)
1443                                 *op_class = 119;
1444                         else
1445                                 *op_class = 120;
1446                 } else {
1447                         *op_class = 118;
1448                 }
1449
1450                 return true;
1451         }
1452
1453         /* 5 GHz, channels 100..144 */
1454         if (freq >= 5500 && freq <= 5720) {
1455                 if (vht_opclass) {
1456                         *op_class = vht_opclass;
1457                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1458                         if (freq > chandef->chan->center_freq)
1459                                 *op_class = 122;
1460                         else
1461                                 *op_class = 123;
1462                 } else {
1463                         *op_class = 121;
1464                 }
1465
1466                 return true;
1467         }
1468
1469         /* 5 GHz, channels 149..169 */
1470         if (freq >= 5745 && freq <= 5845) {
1471                 if (vht_opclass) {
1472                         *op_class = vht_opclass;
1473                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1474                         if (freq > chandef->chan->center_freq)
1475                                 *op_class = 126;
1476                         else
1477                                 *op_class = 127;
1478                 } else if (freq <= 5805) {
1479                         *op_class = 124;
1480                 } else {
1481                         *op_class = 125;
1482                 }
1483
1484                 return true;
1485         }
1486
1487         /* 56.16 GHz, channel 1..4 */
1488         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1489                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1490                         return false;
1491
1492                 *op_class = 180;
1493                 return true;
1494         }
1495
1496         /* not supported yet */
1497         return false;
1498 }
1499 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1500
1501 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1502                                        u32 *beacon_int_gcd,
1503                                        bool *beacon_int_different)
1504 {
1505         struct wireless_dev *wdev;
1506
1507         *beacon_int_gcd = 0;
1508         *beacon_int_different = false;
1509
1510         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1511                 if (!wdev->beacon_interval)
1512                         continue;
1513
1514                 if (!*beacon_int_gcd) {
1515                         *beacon_int_gcd = wdev->beacon_interval;
1516                         continue;
1517                 }
1518
1519                 if (wdev->beacon_interval == *beacon_int_gcd)
1520                         continue;
1521
1522                 *beacon_int_different = true;
1523                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1524         }
1525
1526         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1527                 if (*beacon_int_gcd)
1528                         *beacon_int_different = true;
1529                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1530         }
1531 }
1532
1533 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1534                                  enum nl80211_iftype iftype, u32 beacon_int)
1535 {
1536         /*
1537          * This is just a basic pre-condition check; if interface combinations
1538          * are possible the driver must already be checking those with a call
1539          * to cfg80211_check_combinations(), in which case we'll validate more
1540          * through the cfg80211_calculate_bi_data() call and code in
1541          * cfg80211_iter_combinations().
1542          */
1543
1544         if (beacon_int < 10 || beacon_int > 10000)
1545                 return -EINVAL;
1546
1547         return 0;
1548 }
1549
1550 int cfg80211_iter_combinations(struct wiphy *wiphy,
1551                                struct iface_combination_params *params,
1552                                void (*iter)(const struct ieee80211_iface_combination *c,
1553                                             void *data),
1554                                void *data)
1555 {
1556         const struct ieee80211_regdomain *regdom;
1557         enum nl80211_dfs_regions region = 0;
1558         int i, j, iftype;
1559         int num_interfaces = 0;
1560         u32 used_iftypes = 0;
1561         u32 beacon_int_gcd;
1562         bool beacon_int_different;
1563
1564         /*
1565          * This is a bit strange, since the iteration used to rely only on
1566          * the data given by the driver, but here it now relies on context,
1567          * in form of the currently operating interfaces.
1568          * This is OK for all current users, and saves us from having to
1569          * push the GCD calculations into all the drivers.
1570          * In the future, this should probably rely more on data that's in
1571          * cfg80211 already - the only thing not would appear to be any new
1572          * interfaces (while being brought up) and channel/radar data.
1573          */
1574         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1575                                    &beacon_int_gcd, &beacon_int_different);
1576
1577         if (params->radar_detect) {
1578                 rcu_read_lock();
1579                 regdom = rcu_dereference(cfg80211_regdomain);
1580                 if (regdom)
1581                         region = regdom->dfs_region;
1582                 rcu_read_unlock();
1583         }
1584
1585         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1586                 num_interfaces += params->iftype_num[iftype];
1587                 if (params->iftype_num[iftype] > 0 &&
1588                     !(wiphy->software_iftypes & BIT(iftype)))
1589                         used_iftypes |= BIT(iftype);
1590         }
1591
1592         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1593                 const struct ieee80211_iface_combination *c;
1594                 struct ieee80211_iface_limit *limits;
1595                 u32 all_iftypes = 0;
1596
1597                 c = &wiphy->iface_combinations[i];
1598
1599                 if (num_interfaces > c->max_interfaces)
1600                         continue;
1601                 if (params->num_different_channels > c->num_different_channels)
1602                         continue;
1603
1604                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1605                                  GFP_KERNEL);
1606                 if (!limits)
1607                         return -ENOMEM;
1608
1609                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1610                         if (wiphy->software_iftypes & BIT(iftype))
1611                                 continue;
1612                         for (j = 0; j < c->n_limits; j++) {
1613                                 all_iftypes |= limits[j].types;
1614                                 if (!(limits[j].types & BIT(iftype)))
1615                                         continue;
1616                                 if (limits[j].max < params->iftype_num[iftype])
1617                                         goto cont;
1618                                 limits[j].max -= params->iftype_num[iftype];
1619                         }
1620                 }
1621
1622                 if (params->radar_detect !=
1623                         (c->radar_detect_widths & params->radar_detect))
1624                         goto cont;
1625
1626                 if (params->radar_detect && c->radar_detect_regions &&
1627                     !(c->radar_detect_regions & BIT(region)))
1628                         goto cont;
1629
1630                 /* Finally check that all iftypes that we're currently
1631                  * using are actually part of this combination. If they
1632                  * aren't then we can't use this combination and have
1633                  * to continue to the next.
1634                  */
1635                 if ((all_iftypes & used_iftypes) != used_iftypes)
1636                         goto cont;
1637
1638                 if (beacon_int_gcd) {
1639                         if (c->beacon_int_min_gcd &&
1640                             beacon_int_gcd < c->beacon_int_min_gcd)
1641                                 goto cont;
1642                         if (!c->beacon_int_min_gcd && beacon_int_different)
1643                                 goto cont;
1644                 }
1645
1646                 /* This combination covered all interface types and
1647                  * supported the requested numbers, so we're good.
1648                  */
1649
1650                 (*iter)(c, data);
1651  cont:
1652                 kfree(limits);
1653         }
1654
1655         return 0;
1656 }
1657 EXPORT_SYMBOL(cfg80211_iter_combinations);
1658
1659 static void
1660 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1661                           void *data)
1662 {
1663         int *num = data;
1664         (*num)++;
1665 }
1666
1667 int cfg80211_check_combinations(struct wiphy *wiphy,
1668                                 struct iface_combination_params *params)
1669 {
1670         int err, num = 0;
1671
1672         err = cfg80211_iter_combinations(wiphy, params,
1673                                          cfg80211_iter_sum_ifcombs, &num);
1674         if (err)
1675                 return err;
1676         if (num == 0)
1677                 return -EBUSY;
1678
1679         return 0;
1680 }
1681 EXPORT_SYMBOL(cfg80211_check_combinations);
1682
1683 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1684                            const u8 *rates, unsigned int n_rates,
1685                            u32 *mask)
1686 {
1687         int i, j;
1688
1689         if (!sband)
1690                 return -EINVAL;
1691
1692         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1693                 return -EINVAL;
1694
1695         *mask = 0;
1696
1697         for (i = 0; i < n_rates; i++) {
1698                 int rate = (rates[i] & 0x7f) * 5;
1699                 bool found = false;
1700
1701                 for (j = 0; j < sband->n_bitrates; j++) {
1702                         if (sband->bitrates[j].bitrate == rate) {
1703                                 found = true;
1704                                 *mask |= BIT(j);
1705                                 break;
1706                         }
1707                 }
1708                 if (!found)
1709                         return -EINVAL;
1710         }
1711
1712         /*
1713          * mask must have at least one bit set here since we
1714          * didn't accept a 0-length rates array nor allowed
1715          * entries in the array that didn't exist
1716          */
1717
1718         return 0;
1719 }
1720
1721 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1722 {
1723         enum nl80211_band band;
1724         unsigned int n_channels = 0;
1725
1726         for (band = 0; band < NUM_NL80211_BANDS; band++)
1727                 if (wiphy->bands[band])
1728                         n_channels += wiphy->bands[band]->n_channels;
1729
1730         return n_channels;
1731 }
1732 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1733
1734 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1735                          struct station_info *sinfo)
1736 {
1737         struct cfg80211_registered_device *rdev;
1738         struct wireless_dev *wdev;
1739
1740         wdev = dev->ieee80211_ptr;
1741         if (!wdev)
1742                 return -EOPNOTSUPP;
1743
1744         rdev = wiphy_to_rdev(wdev->wiphy);
1745         if (!rdev->ops->get_station)
1746                 return -EOPNOTSUPP;
1747
1748         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1749 }
1750 EXPORT_SYMBOL(cfg80211_get_station);
1751
1752 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1753 {
1754         int i;
1755
1756         if (!f)
1757                 return;
1758
1759         kfree(f->serv_spec_info);
1760         kfree(f->srf_bf);
1761         kfree(f->srf_macs);
1762         for (i = 0; i < f->num_rx_filters; i++)
1763                 kfree(f->rx_filters[i].filter);
1764
1765         for (i = 0; i < f->num_tx_filters; i++)
1766                 kfree(f->tx_filters[i].filter);
1767
1768         kfree(f->rx_filters);
1769         kfree(f->tx_filters);
1770         kfree(f);
1771 }
1772 EXPORT_SYMBOL(cfg80211_free_nan_func);
1773
1774 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1775                                 u32 center_freq_khz, u32 bw_khz)
1776 {
1777         u32 start_freq_khz, end_freq_khz;
1778
1779         start_freq_khz = center_freq_khz - (bw_khz / 2);
1780         end_freq_khz = center_freq_khz + (bw_khz / 2);
1781
1782         if (start_freq_khz >= freq_range->start_freq_khz &&
1783             end_freq_khz <= freq_range->end_freq_khz)
1784                 return true;
1785
1786         return false;
1787 }
1788
1789 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1790 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1791 const unsigned char rfc1042_header[] __aligned(2) =
1792         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1793 EXPORT_SYMBOL(rfc1042_header);
1794
1795 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1796 const unsigned char bridge_tunnel_header[] __aligned(2) =
1797         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1798 EXPORT_SYMBOL(bridge_tunnel_header);