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                                   u8 data_offset)
 425 {
 426         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 427         struct {
 428                 u8 hdr[ETH_ALEN] __aligned(2);
 429                 __be16 proto;
 430         } payload;
 431         struct ethhdr tmp;
 432         u16 hdrlen;
 433         u8 mesh_flags = 0;
 434
 435         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 436                 return -1;
 437
 438         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 439         if (skb->len < hdrlen + 8)
 440                 return -1;
 441
 442         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 443          * header
 444          * IEEE 802.11 address fields:
 445          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 446          *   0     0   DA    SA    BSSID n/a
 447          *   0     1   DA    BSSID SA    n/a
 448          *   1     0   BSSID SA    DA    n/a
 449          *   1     1   RA    TA    DA    SA
 450          */
 451         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 452         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 453
 454         if (iftype == NL80211_IFTYPE_MESH_POINT)
 455                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 456
 457         mesh_flags &= MESH_FLAGS_AE;
 458
 459         switch (hdr->frame_control &
 460                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 461         case cpu_to_le16(IEEE80211_FCTL_TODS):
 462                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 463                              iftype != NL80211_IFTYPE_AP_VLAN &&
 464                              iftype != NL80211_IFTYPE_P2P_GO))
 465                         return -1;
 466                 break;
 467         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 468                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 469                              iftype != NL80211_IFTYPE_MESH_POINT &&
 470                              iftype != NL80211_IFTYPE_AP_VLAN &&
 471                              iftype != NL80211_IFTYPE_STATION))
 472                         return -1;
 473                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 474                         if (mesh_flags == MESH_FLAGS_AE_A4)
 475                                 return -1;
 476                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 477                                 skb_copy_bits(skb, hdrlen +
 478                                         offsetof(struct ieee80211s_hdr, eaddr1),
 479                                         tmp.h_dest, 2 * ETH_ALEN);
 480                         }
 481                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 482                 }
 483                 break;
 484         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 485                 if ((iftype != NL80211_IFTYPE_STATION &&
 486                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 487                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 488                     (is_multicast_ether_addr(tmp.h_dest) &&
 489                      ether_addr_equal(tmp.h_source, addr)))
 490                         return -1;
 491                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 492                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 493                                 return -1;
 494                         if (mesh_flags == MESH_FLAGS_AE_A4)
 495                                 skb_copy_bits(skb, hdrlen +
 496                                         offsetof(struct ieee80211s_hdr, eaddr1),
 497                                         tmp.h_source, ETH_ALEN);
 498                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 499                 }
 500                 break;
 501         case cpu_to_le16(0):
 502                 if (iftype != NL80211_IFTYPE_ADHOC &&
 503                     iftype != NL80211_IFTYPE_STATION &&
 504                     iftype != NL80211_IFTYPE_OCB)
 505                                 return -1;
 506                 break;
 507         }
 508
 509         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 510         tmp.h_proto = payload.proto;
 511
 512         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 513                     tmp.h_proto != htons(ETH_P_AARP) &&
 514                     tmp.h_proto != htons(ETH_P_IPX)) ||
 515                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 516                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 517                  * replace EtherType */
 518                 hdrlen += ETH_ALEN + 2;
 519         else
 520                 tmp.h_proto = htons(skb->len - hdrlen);
 521
 522         pskb_pull(skb, hdrlen);
 523
 524         if (!ehdr)
 525                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 526         memcpy(ehdr, &tmp, sizeof(tmp));
 527
 528         return 0;
 529 }
 530 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 531
 532 static void
 533 __frame_add_frag(struct sk_buff *skb, struct page *page,
 534                  void *ptr, int len, int size)
 535 {
 536         struct skb_shared_info *sh = skb_shinfo(skb);
 537         int page_offset;
 538
 539         page_ref_inc(page);
 540         page_offset = ptr - page_address(page);
 541         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 542 }
 543
 544 static void
 545 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 546                             int offset, int len)
 547 {
 548         struct skb_shared_info *sh = skb_shinfo(skb);
 549         const skb_frag_t *frag = &sh->frags[0];
 550         struct page *frag_page;
 551         void *frag_ptr;
 552         int frag_len, frag_size;
 553         int head_size = skb->len - skb->data_len;
 554         int cur_len;
 555
 556         frag_page = virt_to_head_page(skb->head);
 557         frag_ptr = skb->data;
 558         frag_size = head_size;
 559
 560         while (offset >= frag_size) {
 561                 offset -= frag_size;
 562                 frag_page = skb_frag_page(frag);
 563                 frag_ptr = skb_frag_address(frag);
 564                 frag_size = skb_frag_size(frag);
 565                 frag++;
 566         }
 567
 568         frag_ptr += offset;
 569         frag_len = frag_size - offset;
 570
 571         cur_len = min(len, frag_len);
 572
 573         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 574         len -= cur_len;
 575
 576         while (len > 0) {
 577                 frag_len = skb_frag_size(frag);
 578                 cur_len = min(len, frag_len);
 579                 __frame_add_frag(frame, skb_frag_page(frag),
 580                                  skb_frag_address(frag), cur_len, frag_len);
 581                 len -= cur_len;
 582                 frag++;
 583         }
 584 }
 585
 586 static struct sk_buff *
 587 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 588                        int offset, int len, bool reuse_frag)
 589 {
 590         struct sk_buff *frame;
 591         int cur_len = len;
 592
 593         if (skb->len - offset < len)
 594                 return NULL;
 595
 596         /*
 597          * When reusing framents, copy some data to the head to simplify
 598          * ethernet header handling and speed up protocol header processing
 599          * in the stack later.
 600          */
 601         if (reuse_frag)
 602                 cur_len = min_t(int, len, 32);
 603
 604         /*
 605          * Allocate and reserve two bytes more for payload
 606          * alignment since sizeof(struct ethhdr) is 14.
 607          */
 608         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 609         if (!frame)
 610                 return NULL;
 611
 612         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 613         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 614
 615         len -= cur_len;
 616         if (!len)
 617                 return frame;
 618
 619         offset += cur_len;
 620         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 621
 622         return frame;
 623 }
 624
 625 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 626                               const u8 *addr, enum nl80211_iftype iftype,
 627                               const unsigned int extra_headroom,
 628                               const u8 *check_da, const u8 *check_sa)
 629 {
 630         unsigned int hlen = ALIGN(extra_headroom, 4);
 631         struct sk_buff *frame = NULL;
 632         u16 ethertype;
 633         u8 *payload;
 634         int offset = 0, remaining;
 635         struct ethhdr eth;
 636         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 637         bool reuse_skb = false;
 638         bool last = false;
 639
 640         while (!last) {
 641                 unsigned int subframe_len;
 642                 int len;
 643                 u8 padding;
 644
 645                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 646                 len = ntohs(eth.h_proto);
 647                 subframe_len = sizeof(struct ethhdr) + len;
 648                 padding = (4 - subframe_len) & 0x3;
 649
 650                 /* the last MSDU has no padding */
 651                 remaining = skb->len - offset;
 652                 if (subframe_len > remaining)
 653                         goto purge;
 654
 655                 offset += sizeof(struct ethhdr);
 656                 last = remaining <= subframe_len + padding;
 657
 658                 /* FIXME: should we really accept multicast DA? */
 659                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 660                      !ether_addr_equal(check_da, eth.h_dest)) ||
 661                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 662                         offset += len + padding;
 663                         continue;
 664                 }
 665
 666                 /* reuse skb for the last subframe */
 667                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 668                         skb_pull(skb, offset);
 669                         frame = skb;
 670                         reuse_skb = true;
 671                 } else {
 672                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 673                                                        reuse_frag);
 674                         if (!frame)
 675                                 goto purge;
 676
 677                         offset += len + padding;
 678                 }
 679
 680                 skb_reset_network_header(frame);
 681                 frame->dev = skb->dev;
 682                 frame->priority = skb->priority;
 683
 684                 payload = frame->data;
 685                 ethertype = (payload[6] << 8) | payload[7];
 686                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 687                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 688                            ether_addr_equal(payload, bridge_tunnel_header))) {
 689                         eth.h_proto = htons(ethertype);
 690                         skb_pull(frame, ETH_ALEN + 2);
 691                 }
 692
 693                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 694                 __skb_queue_tail(list, frame);
 695         }
 696
 697         if (!reuse_skb)
 698                 dev_kfree_skb(skb);
 699
 700         return;
 701
 702  purge:
 703         __skb_queue_purge(list);
 704         dev_kfree_skb(skb);
 705 }
 706 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 707
 708 /* Given a data frame determine the 802.1p/1d tag to use. */
 709 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 710                                     struct cfg80211_qos_map *qos_map)
 711 {
 712         unsigned int dscp;
 713         unsigned char vlan_priority;
 714
 715         /* skb->priority values from 256->263 are magic values to
 716          * directly indicate a specific 802.1d priority.  This is used
 717          * to allow 802.1d priority to be passed directly in from VLAN
 718          * tags, etc.
 719          */
 720         if (skb->priority >= 256 && skb->priority <= 263)
 721                 return skb->priority - 256;
 722
 723         if (skb_vlan_tag_present(skb)) {
 724                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 725                         >> VLAN_PRIO_SHIFT;
 726                 if (vlan_priority > 0)
 727                         return vlan_priority;
 728         }
 729
 730         switch (skb->protocol) {
 731         case htons(ETH_P_IP):
 732                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 733                 break;
 734         case htons(ETH_P_IPV6):
 735                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 736                 break;
 737         case htons(ETH_P_MPLS_UC):
 738         case htons(ETH_P_MPLS_MC): {
 739                 struct mpls_label mpls_tmp, *mpls;
 740
 741                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 742                                           sizeof(*mpls), &mpls_tmp);
 743                 if (!mpls)
 744                         return 0;
 745
 746                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 747                         >> MPLS_LS_TC_SHIFT;
 748         }
 749         case htons(ETH_P_80221):
 750                 /* 802.21 is always network control traffic */
 751                 return 7;
 752         default:
 753                 return 0;
 754         }
 755
 756         if (qos_map) {
 757                 unsigned int i, tmp_dscp = dscp >> 2;
 758
 759                 for (i = 0; i < qos_map->num_des; i++) {
 760                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 761                                 return qos_map->dscp_exception[i].up;
 762                 }
 763
 764                 for (i = 0; i < 8; i++) {
 765                         if (tmp_dscp >= qos_map->up[i].low &&
 766                             tmp_dscp <= qos_map->up[i].high)
 767                                 return i;
 768                 }
 769         }
 770
 771         return dscp >> 5;
 772 }
 773 EXPORT_SYMBOL(cfg80211_classify8021d);
 774
 775 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 776 {
 777         const struct cfg80211_bss_ies *ies;
 778
 779         ies = rcu_dereference(bss->ies);
 780         if (!ies)
 781                 return NULL;
 782
 783         return cfg80211_find_ie(ie, ies->data, ies->len);
 784 }
 785 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 786
 787 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 788 {
 789         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 790         struct net_device *dev = wdev->netdev;
 791         int i;
 792
 793         if (!wdev->connect_keys)
 794                 return;
 795
 796         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 797                 if (!wdev->connect_keys->params[i].cipher)
 798                         continue;
 799                 if (rdev_add_key(rdev, dev, i, false, NULL,
 800                                  &wdev->connect_keys->params[i])) {
 801                         netdev_err(dev, "failed to set key %d\n", i);
 802                         continue;
 803                 }
 804                 if (wdev->connect_keys->def == i &&
 805                     rdev_set_default_key(rdev, dev, i, true, true)) {
 806                         netdev_err(dev, "failed to set defkey %d\n", i);
 807                         continue;
 808                 }
 809         }
 810
 811         kzfree(wdev->connect_keys);
 812         wdev->connect_keys = NULL;
 813 }
 814
 815 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 816 {
 817         struct cfg80211_event *ev;
 818         unsigned long flags;
 819
 820         spin_lock_irqsave(&wdev->event_lock, flags);
 821         while (!list_empty(&wdev->event_list)) {
 822                 ev = list_first_entry(&wdev->event_list,
 823                                       struct cfg80211_event, list);
 824                 list_del(&ev->list);
 825                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 826
 827                 wdev_lock(wdev);
 828                 switch (ev->type) {
 829                 case EVENT_CONNECT_RESULT:
 830                         __cfg80211_connect_result(
 831                                 wdev->netdev,
 832                                 &ev->cr,
 833                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 834                         break;
 835                 case EVENT_ROAMED:
 836                         __cfg80211_roamed(wdev, &ev->rm);
 837                         break;
 838                 case EVENT_DISCONNECTED:
 839                         __cfg80211_disconnected(wdev->netdev,
 840                                                 ev->dc.ie, ev->dc.ie_len,
 841                                                 ev->dc.reason,
 842                                                 !ev->dc.locally_generated);
 843                         break;
 844                 case EVENT_IBSS_JOINED:
 845                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 846                                                ev->ij.channel);
 847                         break;
 848                 case EVENT_STOPPED:
 849                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 850                         break;
 851                 case EVENT_PORT_AUTHORIZED:
 852                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 853                         break;
 854                 }
 855                 wdev_unlock(wdev);
 856
 857                 kfree(ev);
 858
 859                 spin_lock_irqsave(&wdev->event_lock, flags);
 860         }
 861         spin_unlock_irqrestore(&wdev->event_lock, flags);
 862 }
 863
 864 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 865 {
 866         struct wireless_dev *wdev;
 867
 868         ASSERT_RTNL();
 869
 870         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 871                 cfg80211_process_wdev_events(wdev);
 872 }
 873
 874 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 875                           struct net_device *dev, enum nl80211_iftype ntype,
 876                           struct vif_params *params)
 877 {
 878         int err;
 879         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 880
 881         ASSERT_RTNL();
 882
 883         /* don't support changing VLANs, you just re-create them */
 884         if (otype == NL80211_IFTYPE_AP_VLAN)
 885                 return -EOPNOTSUPP;
 886
 887         /* cannot change into P2P device or NAN */
 888         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 889             ntype == NL80211_IFTYPE_NAN)
 890                 return -EOPNOTSUPP;
 891
 892         if (!rdev->ops->change_virtual_intf ||
 893             !(rdev->wiphy.interface_modes & (1 << ntype)))
 894                 return -EOPNOTSUPP;
 895
 896         /* if it's part of a bridge, reject changing type to station/ibss */
 897         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 898             (ntype == NL80211_IFTYPE_ADHOC ||
 899              ntype == NL80211_IFTYPE_STATION ||
 900              ntype == NL80211_IFTYPE_P2P_CLIENT))
 901                 return -EBUSY;
 902
 903         if (ntype != otype) {
 904                 dev->ieee80211_ptr->use_4addr = false;
 905                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 906                 wdev_lock(dev->ieee80211_ptr);
 907                 rdev_set_qos_map(rdev, dev, NULL);
 908                 wdev_unlock(dev->ieee80211_ptr);
 909
 910                 switch (otype) {
 911                 case NL80211_IFTYPE_AP:
 912                         cfg80211_stop_ap(rdev, dev, true);
 913                         break;
 914                 case NL80211_IFTYPE_ADHOC:
 915                         cfg80211_leave_ibss(rdev, dev, false);
 916                         break;
 917                 case NL80211_IFTYPE_STATION:
 918                 case NL80211_IFTYPE_P2P_CLIENT:
 919                         wdev_lock(dev->ieee80211_ptr);
 920                         cfg80211_disconnect(rdev, dev,
 921                                             WLAN_REASON_DEAUTH_LEAVING, true);
 922                         wdev_unlock(dev->ieee80211_ptr);
 923                         break;
 924                 case NL80211_IFTYPE_MESH_POINT:
 925                         /* mesh should be handled? */
 926                         break;
 927                 default:
 928                         break;
 929                 }
 930
 931                 cfg80211_process_rdev_events(rdev);
 932         }
 933
 934         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 935
 936         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 937
 938         if (!err && params && params->use_4addr != -1)
 939                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 940
 941         if (!err) {
 942                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 943                 switch (ntype) {
 944                 case NL80211_IFTYPE_STATION:
 945                         if (dev->ieee80211_ptr->use_4addr)
 946                                 break;
 947                         /* fall through */
 948                 case NL80211_IFTYPE_OCB:
 949                 case NL80211_IFTYPE_P2P_CLIENT:
 950                 case NL80211_IFTYPE_ADHOC:
 951                         dev->priv_flags |= IFF_DONT_BRIDGE;
 952                         break;
 953                 case NL80211_IFTYPE_P2P_GO:
 954                 case NL80211_IFTYPE_AP:
 955                 case NL80211_IFTYPE_AP_VLAN:
 956                 case NL80211_IFTYPE_WDS:
 957                 case NL80211_IFTYPE_MESH_POINT:
 958                         /* bridging OK */
 959                         break;
 960                 case NL80211_IFTYPE_MONITOR:
 961                         /* monitor can't bridge anyway */
 962                         break;
 963                 case NL80211_IFTYPE_UNSPECIFIED:
 964                 case NUM_NL80211_IFTYPES:
 965                         /* not happening */
 966                         break;
 967                 case NL80211_IFTYPE_P2P_DEVICE:
 968                 case NL80211_IFTYPE_NAN:
 969                         WARN_ON(1);
 970                         break;
 971                 }
 972         }
 973
 974         if (!err && ntype != otype && netif_running(dev)) {
 975                 cfg80211_update_iface_num(rdev, ntype, 1);
 976                 cfg80211_update_iface_num(rdev, otype, -1);
 977         }
 978
 979         return err;
 980 }
 981
 982 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
 983 {
 984         int modulation, streams, bitrate;
 985
 986         /* the formula below does only work for MCS values smaller than 32 */
 987         if (WARN_ON_ONCE(rate->mcs >= 32))
 988                 return 0;
 989
 990         modulation = rate->mcs & 7;
 991         streams = (rate->mcs >> 3) + 1;
 992
 993         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
 994
 995         if (modulation < 4)
 996                 bitrate *= (modulation + 1);
 997         else if (modulation == 4)
 998                 bitrate *= (modulation + 2);
 999         else
1000                 bitrate *= (modulation + 3);
1001
1002         bitrate *= streams;
1003
1004         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1005                 bitrate = (bitrate / 9) * 10;
1006
1007         /* do NOT round down here */
1008         return (bitrate + 50000) / 100000;
1009 }
1010
1011 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1012 {
1013         static const u32 __mcs2bitrate[] = {
1014                 /* control PHY */
1015                 [0] =   275,
1016                 /* SC PHY */
1017                 [1] =  3850,
1018                 [2] =  7700,
1019                 [3] =  9625,
1020                 [4] = 11550,
1021                 [5] = 12512, /* 1251.25 mbps */
1022                 [6] = 15400,
1023                 [7] = 19250,
1024                 [8] = 23100,
1025                 [9] = 25025,
1026                 [10] = 30800,
1027                 [11] = 38500,
1028                 [12] = 46200,
1029                 /* OFDM PHY */
1030                 [13] =  6930,
1031                 [14] =  8662, /* 866.25 mbps */
1032                 [15] = 13860,
1033                 [16] = 17325,
1034                 [17] = 20790,
1035                 [18] = 27720,
1036                 [19] = 34650,
1037                 [20] = 41580,
1038                 [21] = 45045,
1039                 [22] = 51975,
1040                 [23] = 62370,
1041                 [24] = 67568, /* 6756.75 mbps */
1042                 /* LP-SC PHY */
1043                 [25] =  6260,
1044                 [26] =  8340,
1045                 [27] = 11120,
1046                 [28] = 12510,
1047                 [29] = 16680,
1048                 [30] = 22240,
1049                 [31] = 25030,
1050         };
1051
1052         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1053                 return 0;
1054
1055         return __mcs2bitrate[rate->mcs];
1056 }
1057
1058 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1059 {
1060         static const u32 base[4][10] = {
1061                 {   6500000,
1062                    13000000,
1063                    19500000,
1064                    26000000,
1065                    39000000,
1066                    52000000,
1067                    58500000,
1068                    65000000,
1069                    78000000,
1070                 /* not in the spec, but some devices use this: */
1071                    86500000,
1072                 },
1073                 {  13500000,
1074                    27000000,
1075                    40500000,
1076                    54000000,
1077                    81000000,
1078                   108000000,
1079                   121500000,
1080                   135000000,
1081                   162000000,
1082                   180000000,
1083                 },
1084                 {  29300000,
1085                    58500000,
1086                    87800000,
1087                   117000000,
1088                   175500000,
1089                   234000000,
1090                   263300000,
1091                   292500000,
1092                   351000000,
1093                   390000000,
1094                 },
1095                 {  58500000,
1096                   117000000,
1097                   175500000,
1098                   234000000,
1099                   351000000,
1100                   468000000,
1101                   526500000,
1102                   585000000,
1103                   702000000,
1104                   780000000,
1105                 },
1106         };
1107         u32 bitrate;
1108         int idx;
1109
1110         if (rate->mcs > 9)
1111                 goto warn;
1112
1113         switch (rate->bw) {
1114         case RATE_INFO_BW_160:
1115                 idx = 3;
1116                 break;
1117         case RATE_INFO_BW_80:
1118                 idx = 2;
1119                 break;
1120         case RATE_INFO_BW_40:
1121                 idx = 1;
1122                 break;
1123         case RATE_INFO_BW_5:
1124         case RATE_INFO_BW_10:
1125         default:
1126                 goto warn;
1127         case RATE_INFO_BW_20:
1128                 idx = 0;
1129         }
1130
1131         bitrate = base[idx][rate->mcs];
1132         bitrate *= rate->nss;
1133
1134         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1135                 bitrate = (bitrate / 9) * 10;
1136
1137         /* do NOT round down here */
1138         return (bitrate + 50000) / 100000;
1139  warn:
1140         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1141                   rate->bw, rate->mcs, rate->nss);
1142         return 0;
1143 }
1144
1145 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1146 {
1147         if (rate->flags & RATE_INFO_FLAGS_MCS)
1148                 return cfg80211_calculate_bitrate_ht(rate);
1149         if (rate->flags & RATE_INFO_FLAGS_60G)
1150                 return cfg80211_calculate_bitrate_60g(rate);
1151         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1152                 return cfg80211_calculate_bitrate_vht(rate);
1153
1154         return rate->legacy;
1155 }
1156 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1157
1158 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1159                           enum ieee80211_p2p_attr_id attr,
1160                           u8 *buf, unsigned int bufsize)
1161 {
1162         u8 *out = buf;
1163         u16 attr_remaining = 0;
1164         bool desired_attr = false;
1165         u16 desired_len = 0;
1166
1167         while (len > 0) {
1168                 unsigned int iedatalen;
1169                 unsigned int copy;
1170                 const u8 *iedata;
1171
1172                 if (len < 2)
1173                         return -EILSEQ;
1174                 iedatalen = ies[1];
1175                 if (iedatalen + 2 > len)
1176                         return -EILSEQ;
1177
1178                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1179                         goto cont;
1180
1181                 if (iedatalen < 4)
1182                         goto cont;
1183
1184                 iedata = ies + 2;
1185
1186                 /* check WFA OUI, P2P subtype */
1187                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1188                     iedata[2] != 0x9a || iedata[3] != 0x09)
1189                         goto cont;
1190
1191                 iedatalen -= 4;
1192                 iedata += 4;
1193
1194                 /* check attribute continuation into this IE */
1195                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1196                 if (copy && 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
1205                         if (copy == attr_remaining)
1206                                 return desired_len;
1207                 }
1208
1209                 attr_remaining -= copy;
1210                 if (attr_remaining)
1211                         goto cont;
1212
1213                 iedatalen -= copy;
1214                 iedata += copy;
1215
1216                 while (iedatalen > 0) {
1217                         u16 attr_len;
1218
1219                         /* P2P attribute ID & size must fit */
1220                         if (iedatalen < 3)
1221                                 return -EILSEQ;
1222                         desired_attr = iedata[0] == attr;
1223                         attr_len = get_unaligned_le16(iedata + 1);
1224                         iedatalen -= 3;
1225                         iedata += 3;
1226
1227                         copy = min_t(unsigned int, attr_len, iedatalen);
1228
1229                         if (desired_attr) {
1230                                 desired_len += copy;
1231                                 if (out) {
1232                                         memcpy(out, iedata, min(bufsize, copy));
1233                                         out += min(bufsize, copy);
1234                                         bufsize -= min(bufsize, copy);
1235                                 }
1236
1237                                 if (copy == attr_len)
1238                                         return desired_len;
1239                         }
1240
1241                         iedata += copy;
1242                         iedatalen -= copy;
1243                         attr_remaining = attr_len - copy;
1244                 }
1245
1246  cont:
1247                 len -= ies[1] + 2;
1248                 ies += ies[1] + 2;
1249         }
1250
1251         if (attr_remaining && desired_attr)
1252                 return -EILSEQ;
1253
1254         return -ENOENT;
1255 }
1256 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1257
1258 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1259 {
1260         int i;
1261
1262         /* Make sure array values are legal */
1263         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1264                 return false;
1265
1266         i = 0;
1267         while (i < n_ids) {
1268                 if (ids[i] == WLAN_EID_EXTENSION) {
1269                         if (id_ext && (ids[i + 1] == id))
1270                                 return true;
1271
1272                         i += 2;
1273                         continue;
1274                 }
1275
1276                 if (ids[i] == id && !id_ext)
1277                         return true;
1278
1279                 i++;
1280         }
1281         return false;
1282 }
1283
1284 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1285 {
1286         /* we assume a validly formed IEs buffer */
1287         u8 len = ies[pos + 1];
1288
1289         pos += 2 + len;
1290
1291         /* the IE itself must have 255 bytes for fragments to follow */
1292         if (len < 255)
1293                 return pos;
1294
1295         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1296                 len = ies[pos + 1];
1297                 pos += 2 + len;
1298         }
1299
1300         return pos;
1301 }
1302
1303 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1304                               const u8 *ids, int n_ids,
1305                               const u8 *after_ric, int n_after_ric,
1306                               size_t offset)
1307 {
1308         size_t pos = offset;
1309
1310         while (pos < ielen) {
1311                 u8 ext = 0;
1312
1313                 if (ies[pos] == WLAN_EID_EXTENSION)
1314                         ext = 2;
1315                 if ((pos + ext) >= ielen)
1316                         break;
1317
1318                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1319                                           ies[pos] == WLAN_EID_EXTENSION))
1320                         break;
1321
1322                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1323                         pos = skip_ie(ies, ielen, pos);
1324
1325                         while (pos < ielen) {
1326                                 if (ies[pos] == WLAN_EID_EXTENSION)
1327                                         ext = 2;
1328                                 else
1329                                         ext = 0;
1330
1331                                 if ((pos + ext) >= ielen)
1332                                         break;
1333
1334                                 if (!ieee80211_id_in_list(after_ric,
1335                                                           n_after_ric,
1336                                                           ies[pos + ext],
1337                                                           ext == 2))
1338                                         pos = skip_ie(ies, ielen, pos);
1339                         }
1340                 } else {
1341                         pos = skip_ie(ies, ielen, pos);
1342                 }
1343         }
1344
1345         return pos;
1346 }
1347 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1348
1349 bool ieee80211_operating_class_to_band(u8 operating_class,
1350                                        enum nl80211_band *band)
1351 {
1352         switch (operating_class) {
1353         case 112:
1354         case 115 ... 127:
1355         case 128 ... 130:
1356                 *band = NL80211_BAND_5GHZ;
1357                 return true;
1358         case 81:
1359         case 82:
1360         case 83:
1361         case 84:
1362                 *band = NL80211_BAND_2GHZ;
1363                 return true;
1364         case 180:
1365                 *band = NL80211_BAND_60GHZ;
1366                 return true;
1367         }
1368
1369         return false;
1370 }
1371 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1372
1373 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1374                                           u8 *op_class)
1375 {
1376         u8 vht_opclass;
1377         u16 freq = chandef->center_freq1;
1378
1379         if (freq >= 2412 && freq <= 2472) {
1380                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1381                         return false;
1382
1383                 /* 2.407 GHz, channels 1..13 */
1384                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1385                         if (freq > chandef->chan->center_freq)
1386                                 *op_class = 83; /* HT40+ */
1387                         else
1388                                 *op_class = 84; /* HT40- */
1389                 } else {
1390                         *op_class = 81;
1391                 }
1392
1393                 return true;
1394         }
1395
1396         if (freq == 2484) {
1397                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1398                         return false;
1399
1400                 *op_class = 82; /* channel 14 */
1401                 return true;
1402         }
1403
1404         switch (chandef->width) {
1405         case NL80211_CHAN_WIDTH_80:
1406                 vht_opclass = 128;
1407                 break;
1408         case NL80211_CHAN_WIDTH_160:
1409                 vht_opclass = 129;
1410                 break;
1411         case NL80211_CHAN_WIDTH_80P80:
1412                 vht_opclass = 130;
1413                 break;
1414         case NL80211_CHAN_WIDTH_10:
1415         case NL80211_CHAN_WIDTH_5:
1416                 return false; /* unsupported for now */
1417         default:
1418                 vht_opclass = 0;
1419                 break;
1420         }
1421
1422         /* 5 GHz, channels 36..48 */
1423         if (freq >= 5180 && freq <= 5240) {
1424                 if (vht_opclass) {
1425                         *op_class = vht_opclass;
1426                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1427                         if (freq > chandef->chan->center_freq)
1428                                 *op_class = 116;
1429                         else
1430                                 *op_class = 117;
1431                 } else {
1432                         *op_class = 115;
1433                 }
1434
1435                 return true;
1436         }
1437
1438         /* 5 GHz, channels 52..64 */
1439         if (freq >= 5260 && freq <= 5320) {
1440                 if (vht_opclass) {
1441                         *op_class = vht_opclass;
1442                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1443                         if (freq > chandef->chan->center_freq)
1444                                 *op_class = 119;
1445                         else
1446                                 *op_class = 120;
1447                 } else {
1448                         *op_class = 118;
1449                 }
1450
1451                 return true;
1452         }
1453
1454         /* 5 GHz, channels 100..144 */
1455         if (freq >= 5500 && freq <= 5720) {
1456                 if (vht_opclass) {
1457                         *op_class = vht_opclass;
1458                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1459                         if (freq > chandef->chan->center_freq)
1460                                 *op_class = 122;
1461                         else
1462                                 *op_class = 123;
1463                 } else {
1464                         *op_class = 121;
1465                 }
1466
1467                 return true;
1468         }
1469
1470         /* 5 GHz, channels 149..169 */
1471         if (freq >= 5745 && freq <= 5845) {
1472                 if (vht_opclass) {
1473                         *op_class = vht_opclass;
1474                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1475                         if (freq > chandef->chan->center_freq)
1476                                 *op_class = 126;
1477                         else
1478                                 *op_class = 127;
1479                 } else if (freq <= 5805) {
1480                         *op_class = 124;
1481                 } else {
1482                         *op_class = 125;
1483                 }
1484
1485                 return true;
1486         }
1487
1488         /* 56.16 GHz, channel 1..4 */
1489         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1490                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1491                         return false;
1492
1493                 *op_class = 180;
1494                 return true;
1495         }
1496
1497         /* not supported yet */
1498         return false;
1499 }
1500 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1501
1502 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1503                                        u32 *beacon_int_gcd,
1504                                        bool *beacon_int_different)
1505 {
1506         struct wireless_dev *wdev;
1507
1508         *beacon_int_gcd = 0;
1509         *beacon_int_different = false;
1510
1511         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1512                 if (!wdev->beacon_interval)
1513                         continue;
1514
1515                 if (!*beacon_int_gcd) {
1516                         *beacon_int_gcd = wdev->beacon_interval;
1517                         continue;
1518                 }
1519
1520                 if (wdev->beacon_interval == *beacon_int_gcd)
1521                         continue;
1522
1523                 *beacon_int_different = true;
1524                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1525         }
1526
1527         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1528                 if (*beacon_int_gcd)
1529                         *beacon_int_different = true;
1530                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1531         }
1532 }
1533
1534 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1535                                  enum nl80211_iftype iftype, u32 beacon_int)
1536 {
1537         /*
1538          * This is just a basic pre-condition check; if interface combinations
1539          * are possible the driver must already be checking those with a call
1540          * to cfg80211_check_combinations(), in which case we'll validate more
1541          * through the cfg80211_calculate_bi_data() call and code in
1542          * cfg80211_iter_combinations().
1543          */
1544
1545         if (beacon_int < 10 || beacon_int > 10000)
1546                 return -EINVAL;
1547
1548         return 0;
1549 }
1550
1551 int cfg80211_iter_combinations(struct wiphy *wiphy,
1552                                struct iface_combination_params *params,
1553                                void (*iter)(const struct ieee80211_iface_combination *c,
1554                                             void *data),
1555                                void *data)
1556 {
1557         const struct ieee80211_regdomain *regdom;
1558         enum nl80211_dfs_regions region = 0;
1559         int i, j, iftype;
1560         int num_interfaces = 0;
1561         u32 used_iftypes = 0;
1562         u32 beacon_int_gcd;
1563         bool beacon_int_different;
1564
1565         /*
1566          * This is a bit strange, since the iteration used to rely only on
1567          * the data given by the driver, but here it now relies on context,
1568          * in form of the currently operating interfaces.
1569          * This is OK for all current users, and saves us from having to
1570          * push the GCD calculations into all the drivers.
1571          * In the future, this should probably rely more on data that's in
1572          * cfg80211 already - the only thing not would appear to be any new
1573          * interfaces (while being brought up) and channel/radar data.
1574          */
1575         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1576                                    &beacon_int_gcd, &beacon_int_different);
1577
1578         if (params->radar_detect) {
1579                 rcu_read_lock();
1580                 regdom = rcu_dereference(cfg80211_regdomain);
1581                 if (regdom)
1582                         region = regdom->dfs_region;
1583                 rcu_read_unlock();
1584         }
1585
1586         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1587                 num_interfaces += params->iftype_num[iftype];
1588                 if (params->iftype_num[iftype] > 0 &&
1589                     !(wiphy->software_iftypes & BIT(iftype)))
1590                         used_iftypes |= BIT(iftype);
1591         }
1592
1593         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1594                 const struct ieee80211_iface_combination *c;
1595                 struct ieee80211_iface_limit *limits;
1596                 u32 all_iftypes = 0;
1597
1598                 c = &wiphy->iface_combinations[i];
1599
1600                 if (num_interfaces > c->max_interfaces)
1601                         continue;
1602                 if (params->num_different_channels > c->num_different_channels)
1603                         continue;
1604
1605                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1606                                  GFP_KERNEL);
1607                 if (!limits)
1608                         return -ENOMEM;
1609
1610                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1611                         if (wiphy->software_iftypes & BIT(iftype))
1612                                 continue;
1613                         for (j = 0; j < c->n_limits; j++) {
1614                                 all_iftypes |= limits[j].types;
1615                                 if (!(limits[j].types & BIT(iftype)))
1616                                         continue;
1617                                 if (limits[j].max < params->iftype_num[iftype])
1618                                         goto cont;
1619                                 limits[j].max -= params->iftype_num[iftype];
1620                         }
1621                 }
1622
1623                 if (params->radar_detect !=
1624                         (c->radar_detect_widths & params->radar_detect))
1625                         goto cont;
1626
1627                 if (params->radar_detect && c->radar_detect_regions &&
1628                     !(c->radar_detect_regions & BIT(region)))
1629                         goto cont;
1630
1631                 /* Finally check that all iftypes that we're currently
1632                  * using are actually part of this combination. If they
1633                  * aren't then we can't use this combination and have
1634                  * to continue to the next.
1635                  */
1636                 if ((all_iftypes & used_iftypes) != used_iftypes)
1637                         goto cont;
1638
1639                 if (beacon_int_gcd) {
1640                         if (c->beacon_int_min_gcd &&
1641                             beacon_int_gcd < c->beacon_int_min_gcd)
1642                                 goto cont;
1643                         if (!c->beacon_int_min_gcd && beacon_int_different)
1644                                 goto cont;
1645                 }
1646
1647                 /* This combination covered all interface types and
1648                  * supported the requested numbers, so we're good.
1649                  */
1650
1651                 (*iter)(c, data);
1652  cont:
1653                 kfree(limits);
1654         }
1655
1656         return 0;
1657 }
1658 EXPORT_SYMBOL(cfg80211_iter_combinations);
1659
1660 static void
1661 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1662                           void *data)
1663 {
1664         int *num = data;
1665         (*num)++;
1666 }
1667
1668 int cfg80211_check_combinations(struct wiphy *wiphy,
1669                                 struct iface_combination_params *params)
1670 {
1671         int err, num = 0;
1672
1673         err = cfg80211_iter_combinations(wiphy, params,
1674                                          cfg80211_iter_sum_ifcombs, &num);
1675         if (err)
1676                 return err;
1677         if (num == 0)
1678                 return -EBUSY;
1679
1680         return 0;
1681 }
1682 EXPORT_SYMBOL(cfg80211_check_combinations);
1683
1684 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1685                            const u8 *rates, unsigned int n_rates,
1686                            u32 *mask)
1687 {
1688         int i, j;
1689
1690         if (!sband)
1691                 return -EINVAL;
1692
1693         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1694                 return -EINVAL;
1695
1696         *mask = 0;
1697
1698         for (i = 0; i < n_rates; i++) {
1699                 int rate = (rates[i] & 0x7f) * 5;
1700                 bool found = false;
1701
1702                 for (j = 0; j < sband->n_bitrates; j++) {
1703                         if (sband->bitrates[j].bitrate == rate) {
1704                                 found = true;
1705                                 *mask |= BIT(j);
1706                                 break;
1707                         }
1708                 }
1709                 if (!found)
1710                         return -EINVAL;
1711         }
1712
1713         /*
1714          * mask must have at least one bit set here since we
1715          * didn't accept a 0-length rates array nor allowed
1716          * entries in the array that didn't exist
1717          */
1718
1719         return 0;
1720 }
1721
1722 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1723 {
1724         enum nl80211_band band;
1725         unsigned int n_channels = 0;
1726
1727         for (band = 0; band < NUM_NL80211_BANDS; band++)
1728                 if (wiphy->bands[band])
1729                         n_channels += wiphy->bands[band]->n_channels;
1730
1731         return n_channels;
1732 }
1733 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1734
1735 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1736                          struct station_info *sinfo)
1737 {
1738         struct cfg80211_registered_device *rdev;
1739         struct wireless_dev *wdev;
1740
1741         wdev = dev->ieee80211_ptr;
1742         if (!wdev)
1743                 return -EOPNOTSUPP;
1744
1745         rdev = wiphy_to_rdev(wdev->wiphy);
1746         if (!rdev->ops->get_station)
1747                 return -EOPNOTSUPP;
1748
1749         memset(sinfo, 0, sizeof(*sinfo));
1750
1751         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1752 }
1753 EXPORT_SYMBOL(cfg80211_get_station);
1754
1755 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1756 {
1757         int i;
1758
1759         if (!f)
1760                 return;
1761
1762         kfree(f->serv_spec_info);
1763         kfree(f->srf_bf);
1764         kfree(f->srf_macs);
1765         for (i = 0; i < f->num_rx_filters; i++)
1766                 kfree(f->rx_filters[i].filter);
1767
1768         for (i = 0; i < f->num_tx_filters; i++)
1769                 kfree(f->tx_filters[i].filter);
1770
1771         kfree(f->rx_filters);
1772         kfree(f->tx_filters);
1773         kfree(f);
1774 }
1775 EXPORT_SYMBOL(cfg80211_free_nan_func);
1776
1777 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1778                                 u32 center_freq_khz, u32 bw_khz)
1779 {
1780         u32 start_freq_khz, end_freq_khz;
1781
1782         start_freq_khz = center_freq_khz - (bw_khz / 2);
1783         end_freq_khz = center_freq_khz + (bw_khz / 2);
1784
1785         if (start_freq_khz >= freq_range->start_freq_khz &&
1786             end_freq_khz <= freq_range->end_freq_khz)
1787                 return true;
1788
1789         return false;
1790 }
1791
1792 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1793 {
1794         sinfo->pertid = kcalloc(sizeof(*(sinfo->pertid)),
1795                                 IEEE80211_NUM_TIDS + 1, gfp);
1796         if (!sinfo->pertid)
1797                 return -ENOMEM;
1798
1799         return 0;
1800 }
1801 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1802
1803 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1804 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1805 const unsigned char rfc1042_header[] __aligned(2) =
1806         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1807 EXPORT_SYMBOL(rfc1042_header);
1808
1809 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1810 const unsigned char bridge_tunnel_header[] __aligned(2) =
1811         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1812 EXPORT_SYMBOL(bridge_tunnel_header);