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  * Copyright 2017       Intel Deutschland GmbH
   8  */
   9 #include <linux/export.h>
  10 #include <linux/bitops.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/slab.h>
  13 #include <net/cfg80211.h>
  14 #include <net/ip.h>
  15 #include <net/dsfield.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/mpls.h>
  18 #include <linux/gcd.h>
  19 #include "core.h"
  20 #include "rdev-ops.h"
  21
  22
  23 struct ieee80211_rate *
  24 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  25                             u32 basic_rates, int bitrate)
  26 {
  27         struct ieee80211_rate *result = &sband->bitrates[0];
  28         int i;
  29
  30         for (i = 0; i < sband->n_bitrates; i++) {
  31                 if (!(basic_rates & BIT(i)))
  32                         continue;
  33                 if (sband->bitrates[i].bitrate > bitrate)
  34                         continue;
  35                 result = &sband->bitrates[i];
  36         }
  37
  38         return result;
  39 }
  40 EXPORT_SYMBOL(ieee80211_get_response_rate);
  41
  42 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  43                               enum nl80211_bss_scan_width scan_width)
  44 {
  45         struct ieee80211_rate *bitrates;
  46         u32 mandatory_rates = 0;
  47         enum ieee80211_rate_flags mandatory_flag;
  48         int i;
  49
  50         if (WARN_ON(!sband))
  51                 return 1;
  52
  53         if (sband->band == NL80211_BAND_2GHZ) {
  54                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  55                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  56                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  57                 else
  58                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  59         } else {
  60                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  61         }
  62
  63         bitrates = sband->bitrates;
  64         for (i = 0; i < sband->n_bitrates; i++)
  65                 if (bitrates[i].flags & mandatory_flag)
  66                         mandatory_rates |= BIT(i);
  67         return mandatory_rates;
  68 }
  69 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  70
  71 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  72 {
  73         /* see 802.11 17.3.8.3.2 and Annex J
  74          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  75         if (chan <= 0)
  76                 return 0; /* not supported */
  77         switch (band) {
  78         case NL80211_BAND_2GHZ:
  79                 if (chan == 14)
  80                         return 2484;
  81                 else if (chan < 14)
  82                         return 2407 + chan * 5;
  83                 break;
  84         case NL80211_BAND_5GHZ:
  85                 if (chan >= 182 && chan <= 196)
  86                         return 4000 + chan * 5;
  87                 else
  88                         return 5000 + chan * 5;
  89                 break;
  90         case NL80211_BAND_60GHZ:
  91                 if (chan < 5)
  92                         return 56160 + chan * 2160;
  93                 break;
  94         default:
  95                 ;
  96         }
  97         return 0; /* not supported */
  98 }
  99 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 100
 101 int ieee80211_frequency_to_channel(int freq)
 102 {
 103         /* see 802.11 17.3.8.3.2 and Annex J */
 104         if (freq == 2484)
 105                 return 14;
 106         else if (freq < 2484)
 107                 return (freq - 2407) / 5;
 108         else if (freq >= 4910 && freq <= 4980)
 109                 return (freq - 4000) / 5;
 110         else if (freq <= 45000) /* DMG band lower limit */
 111                 return (freq - 5000) / 5;
 112         else if (freq >= 58320 && freq <= 64800)
 113                 return (freq - 56160) / 2160;
 114         else
 115                 return 0;
 116 }
 117 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 118
 119 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
 120 {
 121         enum nl80211_band band;
 122         struct ieee80211_supported_band *sband;
 123         int i;
 124
 125         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 126                 sband = wiphy->bands[band];
 127
 128                 if (!sband)
 129                         continue;
 130
 131                 for (i = 0; i < sband->n_channels; i++) {
 132                         if (sband->channels[i].center_freq == freq)
 133                                 return &sband->channels[i];
 134                 }
 135         }
 136
 137         return NULL;
 138 }
 139 EXPORT_SYMBOL(ieee80211_get_channel);
 140
 141 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 142 {
 143         int i, want;
 144
 145         switch (sband->band) {
 146         case NL80211_BAND_5GHZ:
 147                 want = 3;
 148                 for (i = 0; i < sband->n_bitrates; i++) {
 149                         if (sband->bitrates[i].bitrate == 60 ||
 150                             sband->bitrates[i].bitrate == 120 ||
 151                             sband->bitrates[i].bitrate == 240) {
 152                                 sband->bitrates[i].flags |=
 153                                         IEEE80211_RATE_MANDATORY_A;
 154                                 want--;
 155                         }
 156                 }
 157                 WARN_ON(want);
 158                 break;
 159         case NL80211_BAND_2GHZ:
 160                 want = 7;
 161                 for (i = 0; i < sband->n_bitrates; i++) {
 162                         switch (sband->bitrates[i].bitrate) {
 163                         case 10:
 164                         case 20:
 165                         case 55:
 166                         case 110:
 167                                 sband->bitrates[i].flags |=
 168                                         IEEE80211_RATE_MANDATORY_B |
 169                                         IEEE80211_RATE_MANDATORY_G;
 170                                 want--;
 171                                 break;
 172                         case 60:
 173                         case 120:
 174                         case 240:
 175                                 sband->bitrates[i].flags |=
 176                                         IEEE80211_RATE_MANDATORY_G;
 177                                 want--;
 178                                 /* fall through */
 179                         default:
 180                                 sband->bitrates[i].flags |=
 181                                         IEEE80211_RATE_ERP_G;
 182                                 break;
 183                         }
 184                 }
 185                 WARN_ON(want != 0 && want != 3);
 186                 break;
 187         case NL80211_BAND_60GHZ:
 188                 /* check for mandatory HT MCS 1..4 */
 189                 WARN_ON(!sband->ht_cap.ht_supported);
 190                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 191                 break;
 192         case NUM_NL80211_BANDS:
 193         default:
 194                 WARN_ON(1);
 195                 break;
 196         }
 197 }
 198
 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 200 {
 201         enum nl80211_band band;
 202
 203         for (band = 0; band < NUM_NL80211_BANDS; band++)
 204                 if (wiphy->bands[band])
 205                         set_mandatory_flags_band(wiphy->bands[band]);
 206 }
 207
 208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 209 {
 210         int i;
 211         for (i = 0; i < wiphy->n_cipher_suites; i++)
 212                 if (cipher == wiphy->cipher_suites[i])
 213                         return true;
 214         return false;
 215 }
 216
 217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 218                                    struct key_params *params, int key_idx,
 219                                    bool pairwise, const u8 *mac_addr)
 220 {
 221         if (key_idx < 0 || key_idx > 5)
 222                 return -EINVAL;
 223
 224         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 225                 return -EINVAL;
 226
 227         if (pairwise && !mac_addr)
 228                 return -EINVAL;
 229
 230         switch (params->cipher) {
 231         case WLAN_CIPHER_SUITE_TKIP:
 232         case WLAN_CIPHER_SUITE_CCMP:
 233         case WLAN_CIPHER_SUITE_CCMP_256:
 234         case WLAN_CIPHER_SUITE_GCMP:
 235         case WLAN_CIPHER_SUITE_GCMP_256:
 236                 /* Disallow pairwise keys with non-zero index unless it's WEP
 237                  * or a vendor specific cipher (because current deployments use
 238                  * pairwise WEP keys with non-zero indices and for vendor
 239                  * specific ciphers this should be validated in the driver or
 240                  * hardware level - but 802.11i clearly specifies to use zero)
 241                  */
 242                 if (pairwise && key_idx)
 243                         return -EINVAL;
 244                 break;
 245         case WLAN_CIPHER_SUITE_AES_CMAC:
 246         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 247         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 248         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 249                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 250                 if (pairwise)
 251                         return -EINVAL;
 252                 if (key_idx < 4)
 253                         return -EINVAL;
 254                 break;
 255         case WLAN_CIPHER_SUITE_WEP40:
 256         case WLAN_CIPHER_SUITE_WEP104:
 257                 if (key_idx > 3)
 258                         return -EINVAL;
 259         default:
 260                 break;
 261         }
 262
 263         switch (params->cipher) {
 264         case WLAN_CIPHER_SUITE_WEP40:
 265                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 266                         return -EINVAL;
 267                 break;
 268         case WLAN_CIPHER_SUITE_TKIP:
 269                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 270                         return -EINVAL;
 271                 break;
 272         case WLAN_CIPHER_SUITE_CCMP:
 273                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 274                         return -EINVAL;
 275                 break;
 276         case WLAN_CIPHER_SUITE_CCMP_256:
 277                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 278                         return -EINVAL;
 279                 break;
 280         case WLAN_CIPHER_SUITE_GCMP:
 281                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 282                         return -EINVAL;
 283                 break;
 284         case WLAN_CIPHER_SUITE_GCMP_256:
 285                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 286                         return -EINVAL;
 287                 break;
 288         case WLAN_CIPHER_SUITE_WEP104:
 289                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 290                         return -EINVAL;
 291                 break;
 292         case WLAN_CIPHER_SUITE_AES_CMAC:
 293                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 294                         return -EINVAL;
 295                 break;
 296         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 297                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 298                         return -EINVAL;
 299                 break;
 300         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 301                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 302                         return -EINVAL;
 303                 break;
 304         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 305                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 306                         return -EINVAL;
 307                 break;
 308         default:
 309                 /*
 310                  * We don't know anything about this algorithm,
 311                  * allow using it -- but the driver must check
 312                  * all parameters! We still check below whether
 313                  * or not the driver supports this algorithm,
 314                  * of course.
 315                  */
 316                 break;
 317         }
 318
 319         if (params->seq) {
 320                 switch (params->cipher) {
 321                 case WLAN_CIPHER_SUITE_WEP40:
 322                 case WLAN_CIPHER_SUITE_WEP104:
 323                         /* These ciphers do not use key sequence */
 324                         return -EINVAL;
 325                 case WLAN_CIPHER_SUITE_TKIP:
 326                 case WLAN_CIPHER_SUITE_CCMP:
 327                 case WLAN_CIPHER_SUITE_CCMP_256:
 328                 case WLAN_CIPHER_SUITE_GCMP:
 329                 case WLAN_CIPHER_SUITE_GCMP_256:
 330                 case WLAN_CIPHER_SUITE_AES_CMAC:
 331                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 332                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 333                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 334                         if (params->seq_len != 6)
 335                                 return -EINVAL;
 336                         break;
 337                 }
 338         }
 339
 340         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 341                 return -EINVAL;
 342
 343         return 0;
 344 }
 345
 346 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 347 {
 348         unsigned int hdrlen = 24;
 349
 350         if (ieee80211_is_data(fc)) {
 351                 if (ieee80211_has_a4(fc))
 352                         hdrlen = 30;
 353                 if (ieee80211_is_data_qos(fc)) {
 354                         hdrlen += IEEE80211_QOS_CTL_LEN;
 355                         if (ieee80211_has_order(fc))
 356                                 hdrlen += IEEE80211_HT_CTL_LEN;
 357                 }
 358                 goto out;
 359         }
 360
 361         if (ieee80211_is_mgmt(fc)) {
 362                 if (ieee80211_has_order(fc))
 363                         hdrlen += IEEE80211_HT_CTL_LEN;
 364                 goto out;
 365         }
 366
 367         if (ieee80211_is_ctl(fc)) {
 368                 /*
 369                  * ACK and CTS are 10 bytes, all others 16. To see how
 370                  * to get this condition consider
 371                  *   subtype mask:   0b0000000011110000 (0x00F0)
 372                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 373                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 374                  *   bits that matter:         ^^^      (0x00E0)
 375                  *   value of those: 0b0000000011000000 (0x00C0)
 376                  */
 377                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 378                         hdrlen = 10;
 379                 else
 380                         hdrlen = 16;
 381         }
 382 out:
 383         return hdrlen;
 384 }
 385 EXPORT_SYMBOL(ieee80211_hdrlen);
 386
 387 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 388 {
 389         const struct ieee80211_hdr *hdr =
 390                         (const struct ieee80211_hdr *)skb->data;
 391         unsigned int hdrlen;
 392
 393         if (unlikely(skb->len < 10))
 394                 return 0;
 395         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 396         if (unlikely(hdrlen > skb->len))
 397                 return 0;
 398         return hdrlen;
 399 }
 400 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 401
 402 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 403 {
 404         int ae = flags & MESH_FLAGS_AE;
 405         /* 802.11-2012, 8.2.4.7.3 */
 406         switch (ae) {
 407         default:
 408         case 0:
 409                 return 6;
 410         case MESH_FLAGS_AE_A4:
 411                 return 12;
 412         case MESH_FLAGS_AE_A5_A6:
 413                 return 18;
 414         }
 415 }
 416
 417 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 418 {
 419         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 420 }
 421 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 422
 423 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 424                                   const u8 *addr, enum nl80211_iftype iftype,
 425                                   u8 data_offset)
 426 {
 427         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 428         struct {
 429                 u8 hdr[ETH_ALEN] __aligned(2);
 430                 __be16 proto;
 431         } payload;
 432         struct ethhdr tmp;
 433         u16 hdrlen;
 434         u8 mesh_flags = 0;
 435
 436         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 437                 return -1;
 438
 439         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 440         if (skb->len < hdrlen + 8)
 441                 return -1;
 442
 443         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 444          * header
 445          * IEEE 802.11 address fields:
 446          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 447          *   0     0   DA    SA    BSSID n/a
 448          *   0     1   DA    BSSID SA    n/a
 449          *   1     0   BSSID SA    DA    n/a
 450          *   1     1   RA    TA    DA    SA
 451          */
 452         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 453         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 454
 455         if (iftype == NL80211_IFTYPE_MESH_POINT)
 456                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 457
 458         mesh_flags &= MESH_FLAGS_AE;
 459
 460         switch (hdr->frame_control &
 461                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 462         case cpu_to_le16(IEEE80211_FCTL_TODS):
 463                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 464                              iftype != NL80211_IFTYPE_AP_VLAN &&
 465                              iftype != NL80211_IFTYPE_P2P_GO))
 466                         return -1;
 467                 break;
 468         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 469                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 470                              iftype != NL80211_IFTYPE_MESH_POINT &&
 471                              iftype != NL80211_IFTYPE_AP_VLAN &&
 472                              iftype != NL80211_IFTYPE_STATION))
 473                         return -1;
 474                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 475                         if (mesh_flags == MESH_FLAGS_AE_A4)
 476                                 return -1;
 477                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 478                                 skb_copy_bits(skb, hdrlen +
 479                                         offsetof(struct ieee80211s_hdr, eaddr1),
 480                                         tmp.h_dest, 2 * ETH_ALEN);
 481                         }
 482                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 483                 }
 484                 break;
 485         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 486                 if ((iftype != NL80211_IFTYPE_STATION &&
 487                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 488                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 489                     (is_multicast_ether_addr(tmp.h_dest) &&
 490                      ether_addr_equal(tmp.h_source, addr)))
 491                         return -1;
 492                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 493                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 494                                 return -1;
 495                         if (mesh_flags == MESH_FLAGS_AE_A4)
 496                                 skb_copy_bits(skb, hdrlen +
 497                                         offsetof(struct ieee80211s_hdr, eaddr1),
 498                                         tmp.h_source, ETH_ALEN);
 499                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 500                 }
 501                 break;
 502         case cpu_to_le16(0):
 503                 if (iftype != NL80211_IFTYPE_ADHOC &&
 504                     iftype != NL80211_IFTYPE_STATION &&
 505                     iftype != NL80211_IFTYPE_OCB)
 506                                 return -1;
 507                 break;
 508         }
 509
 510         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 511         tmp.h_proto = payload.proto;
 512
 513         if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
 514                     tmp.h_proto != htons(ETH_P_AARP) &&
 515                     tmp.h_proto != htons(ETH_P_IPX)) ||
 516                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 517                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 518                  * replace EtherType */
 519                 hdrlen += ETH_ALEN + 2;
 520         else
 521                 tmp.h_proto = htons(skb->len - hdrlen);
 522
 523         pskb_pull(skb, hdrlen);
 524
 525         if (!ehdr)
 526                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 527         memcpy(ehdr, &tmp, sizeof(tmp));
 528
 529         return 0;
 530 }
 531 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 532
 533 static void
 534 __frame_add_frag(struct sk_buff *skb, struct page *page,
 535                  void *ptr, int len, int size)
 536 {
 537         struct skb_shared_info *sh = skb_shinfo(skb);
 538         int page_offset;
 539
 540         page_ref_inc(page);
 541         page_offset = ptr - page_address(page);
 542         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 543 }
 544
 545 static void
 546 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 547                             int offset, int len)
 548 {
 549         struct skb_shared_info *sh = skb_shinfo(skb);
 550         const skb_frag_t *frag = &sh->frags[0];
 551         struct page *frag_page;
 552         void *frag_ptr;
 553         int frag_len, frag_size;
 554         int head_size = skb->len - skb->data_len;
 555         int cur_len;
 556
 557         frag_page = virt_to_head_page(skb->head);
 558         frag_ptr = skb->data;
 559         frag_size = head_size;
 560
 561         while (offset >= frag_size) {
 562                 offset -= frag_size;
 563                 frag_page = skb_frag_page(frag);
 564                 frag_ptr = skb_frag_address(frag);
 565                 frag_size = skb_frag_size(frag);
 566                 frag++;
 567         }
 568
 569         frag_ptr += offset;
 570         frag_len = frag_size - offset;
 571
 572         cur_len = min(len, frag_len);
 573
 574         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 575         len -= cur_len;
 576
 577         while (len > 0) {
 578                 frag_len = skb_frag_size(frag);
 579                 cur_len = min(len, frag_len);
 580                 __frame_add_frag(frame, skb_frag_page(frag),
 581                                  skb_frag_address(frag), cur_len, frag_len);
 582                 len -= cur_len;
 583                 frag++;
 584         }
 585 }
 586
 587 static struct sk_buff *
 588 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 589                        int offset, int len, bool reuse_frag)
 590 {
 591         struct sk_buff *frame;
 592         int cur_len = len;
 593
 594         if (skb->len - offset < len)
 595                 return NULL;
 596
 597         /*
 598          * When reusing framents, copy some data to the head to simplify
 599          * ethernet header handling and speed up protocol header processing
 600          * in the stack later.
 601          */
 602         if (reuse_frag)
 603                 cur_len = min_t(int, len, 32);
 604
 605         /*
 606          * Allocate and reserve two bytes more for payload
 607          * alignment since sizeof(struct ethhdr) is 14.
 608          */
 609         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 610         if (!frame)
 611                 return NULL;
 612
 613         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 614         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 615
 616         len -= cur_len;
 617         if (!len)
 618                 return frame;
 619
 620         offset += cur_len;
 621         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 622
 623         return frame;
 624 }
 625
 626 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 627                               const u8 *addr, enum nl80211_iftype iftype,
 628                               const unsigned int extra_headroom,
 629                               const u8 *check_da, const u8 *check_sa)
 630 {
 631         unsigned int hlen = ALIGN(extra_headroom, 4);
 632         struct sk_buff *frame = NULL;
 633         u16 ethertype;
 634         u8 *payload;
 635         int offset = 0, remaining;
 636         struct ethhdr eth;
 637         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 638         bool reuse_skb = false;
 639         bool last = false;
 640
 641         while (!last) {
 642                 unsigned int subframe_len;
 643                 int len;
 644                 u8 padding;
 645
 646                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 647                 len = ntohs(eth.h_proto);
 648                 subframe_len = sizeof(struct ethhdr) + len;
 649                 padding = (4 - subframe_len) & 0x3;
 650
 651                 /* the last MSDU has no padding */
 652                 remaining = skb->len - offset;
 653                 if (subframe_len > remaining)
 654                         goto purge;
 655
 656                 offset += sizeof(struct ethhdr);
 657                 last = remaining <= subframe_len + padding;
 658
 659                 /* FIXME: should we really accept multicast DA? */
 660                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 661                      !ether_addr_equal(check_da, eth.h_dest)) ||
 662                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 663                         offset += len + padding;
 664                         continue;
 665                 }
 666
 667                 /* reuse skb for the last subframe */
 668                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 669                         skb_pull(skb, offset);
 670                         frame = skb;
 671                         reuse_skb = true;
 672                 } else {
 673                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 674                                                        reuse_frag);
 675                         if (!frame)
 676                                 goto purge;
 677
 678                         offset += len + padding;
 679                 }
 680
 681                 skb_reset_network_header(frame);
 682                 frame->dev = skb->dev;
 683                 frame->priority = skb->priority;
 684
 685                 payload = frame->data;
 686                 ethertype = (payload[6] << 8) | payload[7];
 687                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 688                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 689                            ether_addr_equal(payload, bridge_tunnel_header))) {
 690                         eth.h_proto = htons(ethertype);
 691                         skb_pull(frame, ETH_ALEN + 2);
 692                 }
 693
 694                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 695                 __skb_queue_tail(list, frame);
 696         }
 697
 698         if (!reuse_skb)
 699                 dev_kfree_skb(skb);
 700
 701         return;
 702
 703  purge:
 704         __skb_queue_purge(list);
 705         dev_kfree_skb(skb);
 706 }
 707 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 708
 709 /* Given a data frame determine the 802.1p/1d tag to use. */
 710 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 711                                     struct cfg80211_qos_map *qos_map)
 712 {
 713         unsigned int dscp;
 714         unsigned char vlan_priority;
 715
 716         /* skb->priority values from 256->263 are magic values to
 717          * directly indicate a specific 802.1d priority.  This is used
 718          * to allow 802.1d priority to be passed directly in from VLAN
 719          * tags, etc.
 720          */
 721         if (skb->priority >= 256 && skb->priority <= 263)
 722                 return skb->priority - 256;
 723
 724         if (skb_vlan_tag_present(skb)) {
 725                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 726                         >> VLAN_PRIO_SHIFT;
 727                 if (vlan_priority > 0)
 728                         return vlan_priority;
 729         }
 730
 731         switch (skb->protocol) {
 732         case htons(ETH_P_IP):
 733                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 734                 break;
 735         case htons(ETH_P_IPV6):
 736                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 737                 break;
 738         case htons(ETH_P_MPLS_UC):
 739         case htons(ETH_P_MPLS_MC): {
 740                 struct mpls_label mpls_tmp, *mpls;
 741
 742                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 743                                           sizeof(*mpls), &mpls_tmp);
 744                 if (!mpls)
 745                         return 0;
 746
 747                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 748                         >> MPLS_LS_TC_SHIFT;
 749         }
 750         case htons(ETH_P_80221):
 751                 /* 802.21 is always network control traffic */
 752                 return 7;
 753         default:
 754                 return 0;
 755         }
 756
 757         if (qos_map) {
 758                 unsigned int i, tmp_dscp = dscp >> 2;
 759
 760                 for (i = 0; i < qos_map->num_des; i++) {
 761                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
 762                                 return qos_map->dscp_exception[i].up;
 763                 }
 764
 765                 for (i = 0; i < 8; i++) {
 766                         if (tmp_dscp >= qos_map->up[i].low &&
 767                             tmp_dscp <= qos_map->up[i].high)
 768                                 return i;
 769                 }
 770         }
 771
 772         return dscp >> 5;
 773 }
 774 EXPORT_SYMBOL(cfg80211_classify8021d);
 775
 776 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 777 {
 778         const struct cfg80211_bss_ies *ies;
 779
 780         ies = rcu_dereference(bss->ies);
 781         if (!ies)
 782                 return NULL;
 783
 784         return cfg80211_find_ie(ie, ies->data, ies->len);
 785 }
 786 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 787
 788 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 789 {
 790         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 791         struct net_device *dev = wdev->netdev;
 792         int i;
 793
 794         if (!wdev->connect_keys)
 795                 return;
 796
 797         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 798                 if (!wdev->connect_keys->params[i].cipher)
 799                         continue;
 800                 if (rdev_add_key(rdev, dev, i, false, NULL,
 801                                  &wdev->connect_keys->params[i])) {
 802                         netdev_err(dev, "failed to set key %d\n", i);
 803                         continue;
 804                 }
 805                 if (wdev->connect_keys->def == i &&
 806                     rdev_set_default_key(rdev, dev, i, true, true)) {
 807                         netdev_err(dev, "failed to set defkey %d\n", i);
 808                         continue;
 809                 }
 810         }
 811
 812         kzfree(wdev->connect_keys);
 813         wdev->connect_keys = NULL;
 814 }
 815
 816 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 817 {
 818         struct cfg80211_event *ev;
 819         unsigned long flags;
 820
 821         spin_lock_irqsave(&wdev->event_lock, flags);
 822         while (!list_empty(&wdev->event_list)) {
 823                 ev = list_first_entry(&wdev->event_list,
 824                                       struct cfg80211_event, list);
 825                 list_del(&ev->list);
 826                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 827
 828                 wdev_lock(wdev);
 829                 switch (ev->type) {
 830                 case EVENT_CONNECT_RESULT:
 831                         __cfg80211_connect_result(
 832                                 wdev->netdev,
 833                                 &ev->cr,
 834                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 835                         break;
 836                 case EVENT_ROAMED:
 837                         __cfg80211_roamed(wdev, &ev->rm);
 838                         break;
 839                 case EVENT_DISCONNECTED:
 840                         __cfg80211_disconnected(wdev->netdev,
 841                                                 ev->dc.ie, ev->dc.ie_len,
 842                                                 ev->dc.reason,
 843                                                 !ev->dc.locally_generated);
 844                         break;
 845                 case EVENT_IBSS_JOINED:
 846                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 847                                                ev->ij.channel);
 848                         break;
 849                 case EVENT_STOPPED:
 850                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 851                         break;
 852                 case EVENT_PORT_AUTHORIZED:
 853                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 854                         break;
 855                 }
 856                 wdev_unlock(wdev);
 857
 858                 kfree(ev);
 859
 860                 spin_lock_irqsave(&wdev->event_lock, flags);
 861         }
 862         spin_unlock_irqrestore(&wdev->event_lock, flags);
 863 }
 864
 865 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 866 {
 867         struct wireless_dev *wdev;
 868
 869         ASSERT_RTNL();
 870
 871         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 872                 cfg80211_process_wdev_events(wdev);
 873 }
 874
 875 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 876                           struct net_device *dev, enum nl80211_iftype ntype,
 877                           struct vif_params *params)
 878 {
 879         int err;
 880         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 881
 882         ASSERT_RTNL();
 883
 884         /* don't support changing VLANs, you just re-create them */
 885         if (otype == NL80211_IFTYPE_AP_VLAN)
 886                 return -EOPNOTSUPP;
 887
 888         /* cannot change into P2P device or NAN */
 889         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 890             ntype == NL80211_IFTYPE_NAN)
 891                 return -EOPNOTSUPP;
 892
 893         if (!rdev->ops->change_virtual_intf ||
 894             !(rdev->wiphy.interface_modes & (1 << ntype)))
 895                 return -EOPNOTSUPP;
 896
 897         /* if it's part of a bridge, reject changing type to station/ibss */
 898         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 899             (ntype == NL80211_IFTYPE_ADHOC ||
 900              ntype == NL80211_IFTYPE_STATION ||
 901              ntype == NL80211_IFTYPE_P2P_CLIENT))
 902                 return -EBUSY;
 903
 904         if (ntype != otype) {
 905                 dev->ieee80211_ptr->use_4addr = false;
 906                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 907                 wdev_lock(dev->ieee80211_ptr);
 908                 rdev_set_qos_map(rdev, dev, NULL);
 909                 wdev_unlock(dev->ieee80211_ptr);
 910
 911                 switch (otype) {
 912                 case NL80211_IFTYPE_AP:
 913                         cfg80211_stop_ap(rdev, dev, true);
 914                         break;
 915                 case NL80211_IFTYPE_ADHOC:
 916                         cfg80211_leave_ibss(rdev, dev, false);
 917                         break;
 918                 case NL80211_IFTYPE_STATION:
 919                 case NL80211_IFTYPE_P2P_CLIENT:
 920                         wdev_lock(dev->ieee80211_ptr);
 921                         cfg80211_disconnect(rdev, dev,
 922                                             WLAN_REASON_DEAUTH_LEAVING, true);
 923                         wdev_unlock(dev->ieee80211_ptr);
 924                         break;
 925                 case NL80211_IFTYPE_MESH_POINT:
 926                         /* mesh should be handled? */
 927                         break;
 928                 default:
 929                         break;
 930                 }
 931
 932                 cfg80211_process_rdev_events(rdev);
 933         }
 934
 935         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
 936
 937         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 938
 939         if (!err && params && params->use_4addr != -1)
 940                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 941
 942         if (!err) {
 943                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 944                 switch (ntype) {
 945                 case NL80211_IFTYPE_STATION:
 946                         if (dev->ieee80211_ptr->use_4addr)
 947                                 break;
 948                         /* fall through */
 949                 case NL80211_IFTYPE_OCB:
 950                 case NL80211_IFTYPE_P2P_CLIENT:
 951                 case NL80211_IFTYPE_ADHOC:
 952                         dev->priv_flags |= IFF_DONT_BRIDGE;
 953                         break;
 954                 case NL80211_IFTYPE_P2P_GO:
 955                 case NL80211_IFTYPE_AP:
 956                 case NL80211_IFTYPE_AP_VLAN:
 957                 case NL80211_IFTYPE_WDS:
 958                 case NL80211_IFTYPE_MESH_POINT:
 959                         /* bridging OK */
 960                         break;
 961                 case NL80211_IFTYPE_MONITOR:
 962                         /* monitor can't bridge anyway */
 963                         break;
 964                 case NL80211_IFTYPE_UNSPECIFIED:
 965                 case NUM_NL80211_IFTYPES:
 966                         /* not happening */
 967                         break;
 968                 case NL80211_IFTYPE_P2P_DEVICE:
 969                 case NL80211_IFTYPE_NAN:
 970                         WARN_ON(1);
 971                         break;
 972                 }
 973         }
 974
 975         if (!err && ntype != otype && netif_running(dev)) {
 976                 cfg80211_update_iface_num(rdev, ntype, 1);
 977                 cfg80211_update_iface_num(rdev, otype, -1);
 978         }
 979
 980         return err;
 981 }
 982
 983 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
 984 {
 985         int modulation, streams, bitrate;
 986
 987         /* the formula below does only work for MCS values smaller than 32 */
 988         if (WARN_ON_ONCE(rate->mcs >= 32))
 989                 return 0;
 990
 991         modulation = rate->mcs & 7;
 992         streams = (rate->mcs >> 3) + 1;
 993
 994         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
 995
 996         if (modulation < 4)
 997                 bitrate *= (modulation + 1);
 998         else if (modulation == 4)
 999                 bitrate *= (modulation + 2);
1000         else
1001                 bitrate *= (modulation + 3);
1002
1003         bitrate *= streams;
1004
1005         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1006                 bitrate = (bitrate / 9) * 10;
1007
1008         /* do NOT round down here */
1009         return (bitrate + 50000) / 100000;
1010 }
1011
1012 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1013 {
1014         static const u32 __mcs2bitrate[] = {
1015                 /* control PHY */
1016                 [0] =   275,
1017                 /* SC PHY */
1018                 [1] =  3850,
1019                 [2] =  7700,
1020                 [3] =  9625,
1021                 [4] = 11550,
1022                 [5] = 12512, /* 1251.25 mbps */
1023                 [6] = 15400,
1024                 [7] = 19250,
1025                 [8] = 23100,
1026                 [9] = 25025,
1027                 [10] = 30800,
1028                 [11] = 38500,
1029                 [12] = 46200,
1030                 /* OFDM PHY */
1031                 [13] =  6930,
1032                 [14] =  8662, /* 866.25 mbps */
1033                 [15] = 13860,
1034                 [16] = 17325,
1035                 [17] = 20790,
1036                 [18] = 27720,
1037                 [19] = 34650,
1038                 [20] = 41580,
1039                 [21] = 45045,
1040                 [22] = 51975,
1041                 [23] = 62370,
1042                 [24] = 67568, /* 6756.75 mbps */
1043                 /* LP-SC PHY */
1044                 [25] =  6260,
1045                 [26] =  8340,
1046                 [27] = 11120,
1047                 [28] = 12510,
1048                 [29] = 16680,
1049                 [30] = 22240,
1050                 [31] = 25030,
1051         };
1052
1053         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1054                 return 0;
1055
1056         return __mcs2bitrate[rate->mcs];
1057 }
1058
1059 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1060 {
1061         static const u32 base[4][10] = {
1062                 {   6500000,
1063                    13000000,
1064                    19500000,
1065                    26000000,
1066                    39000000,
1067                    52000000,
1068                    58500000,
1069                    65000000,
1070                    78000000,
1071                 /* not in the spec, but some devices use this: */
1072                    86500000,
1073                 },
1074                 {  13500000,
1075                    27000000,
1076                    40500000,
1077                    54000000,
1078                    81000000,
1079                   108000000,
1080                   121500000,
1081                   135000000,
1082                   162000000,
1083                   180000000,
1084                 },
1085                 {  29300000,
1086                    58500000,
1087                    87800000,
1088                   117000000,
1089                   175500000,
1090                   234000000,
1091                   263300000,
1092                   292500000,
1093                   351000000,
1094                   390000000,
1095                 },
1096                 {  58500000,
1097                   117000000,
1098                   175500000,
1099                   234000000,
1100                   351000000,
1101                   468000000,
1102                   526500000,
1103                   585000000,
1104                   702000000,
1105                   780000000,
1106                 },
1107         };
1108         u32 bitrate;
1109         int idx;
1110
1111         if (rate->mcs > 9)
1112                 goto warn;
1113
1114         switch (rate->bw) {
1115         case RATE_INFO_BW_160:
1116                 idx = 3;
1117                 break;
1118         case RATE_INFO_BW_80:
1119                 idx = 2;
1120                 break;
1121         case RATE_INFO_BW_40:
1122                 idx = 1;
1123                 break;
1124         case RATE_INFO_BW_5:
1125         case RATE_INFO_BW_10:
1126         default:
1127                 goto warn;
1128         case RATE_INFO_BW_20:
1129                 idx = 0;
1130         }
1131
1132         bitrate = base[idx][rate->mcs];
1133         bitrate *= rate->nss;
1134
1135         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1136                 bitrate = (bitrate / 9) * 10;
1137
1138         /* do NOT round down here */
1139         return (bitrate + 50000) / 100000;
1140  warn:
1141         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1142                   rate->bw, rate->mcs, rate->nss);
1143         return 0;
1144 }
1145
1146 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1147 {
1148 #define SCALE 2048
1149         u16 mcs_divisors[12] = {
1150                 34133, /* 16.666666... */
1151                 17067, /*  8.333333... */
1152                 11378, /*  5.555555... */
1153                  8533, /*  4.166666... */
1154                  5689, /*  2.777777... */
1155                  4267, /*  2.083333... */
1156                  3923, /*  1.851851... */
1157                  3413, /*  1.666666... */
1158                  2844, /*  1.388888... */
1159                  2560, /*  1.250000... */
1160                  2276, /*  1.111111... */
1161                  2048, /*  1.000000... */
1162         };
1163         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1164         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1165         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1166         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1167         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1168         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1169         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1170         u64 tmp;
1171         u32 result;
1172
1173         if (WARN_ON_ONCE(rate->mcs > 11))
1174                 return 0;
1175
1176         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1177                 return 0;
1178         if (WARN_ON_ONCE(rate->he_ru_alloc >
1179                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1180                 return 0;
1181         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1182                 return 0;
1183
1184         if (rate->bw == RATE_INFO_BW_160)
1185                 result = rates_160M[rate->he_gi];
1186         else if (rate->bw == RATE_INFO_BW_80 ||
1187                  (rate->bw == RATE_INFO_BW_HE_RU &&
1188                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1189                 result = rates_969[rate->he_gi];
1190         else if (rate->bw == RATE_INFO_BW_40 ||
1191                  (rate->bw == RATE_INFO_BW_HE_RU &&
1192                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1193                 result = rates_484[rate->he_gi];
1194         else if (rate->bw == RATE_INFO_BW_20 ||
1195                  (rate->bw == RATE_INFO_BW_HE_RU &&
1196                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1197                 result = rates_242[rate->he_gi];
1198         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1199                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1200                 result = rates_106[rate->he_gi];
1201         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1202                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1203                 result = rates_52[rate->he_gi];
1204         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1205                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1206                 result = rates_26[rate->he_gi];
1207         else if (WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1208                       rate->bw, rate->he_ru_alloc))
1209                 return 0;
1210
1211         /* now scale to the appropriate MCS */
1212         tmp = result;
1213         tmp *= SCALE;
1214         do_div(tmp, mcs_divisors[rate->mcs]);
1215         result = tmp;
1216
1217         /* and take NSS, DCM into account */
1218         result = (result * rate->nss) / 8;
1219         if (rate->he_dcm)
1220                 result /= 2;
1221
1222         return result;
1223 }
1224
1225 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1226 {
1227         if (rate->flags & RATE_INFO_FLAGS_MCS)
1228                 return cfg80211_calculate_bitrate_ht(rate);
1229         if (rate->flags & RATE_INFO_FLAGS_60G)
1230                 return cfg80211_calculate_bitrate_60g(rate);
1231         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1232                 return cfg80211_calculate_bitrate_vht(rate);
1233         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1234                 return cfg80211_calculate_bitrate_he(rate);
1235
1236         return rate->legacy;
1237 }
1238 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1239
1240 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1241                           enum ieee80211_p2p_attr_id attr,
1242                           u8 *buf, unsigned int bufsize)
1243 {
1244         u8 *out = buf;
1245         u16 attr_remaining = 0;
1246         bool desired_attr = false;
1247         u16 desired_len = 0;
1248
1249         while (len > 0) {
1250                 unsigned int iedatalen;
1251                 unsigned int copy;
1252                 const u8 *iedata;
1253
1254                 if (len < 2)
1255                         return -EILSEQ;
1256                 iedatalen = ies[1];
1257                 if (iedatalen + 2 > len)
1258                         return -EILSEQ;
1259
1260                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1261                         goto cont;
1262
1263                 if (iedatalen < 4)
1264                         goto cont;
1265
1266                 iedata = ies + 2;
1267
1268                 /* check WFA OUI, P2P subtype */
1269                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1270                     iedata[2] != 0x9a || iedata[3] != 0x09)
1271                         goto cont;
1272
1273                 iedatalen -= 4;
1274                 iedata += 4;
1275
1276                 /* check attribute continuation into this IE */
1277                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1278                 if (copy && desired_attr) {
1279                         desired_len += copy;
1280                         if (out) {
1281                                 memcpy(out, iedata, min(bufsize, copy));
1282                                 out += min(bufsize, copy);
1283                                 bufsize -= min(bufsize, copy);
1284                         }
1285
1286
1287                         if (copy == attr_remaining)
1288                                 return desired_len;
1289                 }
1290
1291                 attr_remaining -= copy;
1292                 if (attr_remaining)
1293                         goto cont;
1294
1295                 iedatalen -= copy;
1296                 iedata += copy;
1297
1298                 while (iedatalen > 0) {
1299                         u16 attr_len;
1300
1301                         /* P2P attribute ID & size must fit */
1302                         if (iedatalen < 3)
1303                                 return -EILSEQ;
1304                         desired_attr = iedata[0] == attr;
1305                         attr_len = get_unaligned_le16(iedata + 1);
1306                         iedatalen -= 3;
1307                         iedata += 3;
1308
1309                         copy = min_t(unsigned int, attr_len, iedatalen);
1310
1311                         if (desired_attr) {
1312                                 desired_len += copy;
1313                                 if (out) {
1314                                         memcpy(out, iedata, min(bufsize, copy));
1315                                         out += min(bufsize, copy);
1316                                         bufsize -= min(bufsize, copy);
1317                                 }
1318
1319                                 if (copy == attr_len)
1320                                         return desired_len;
1321                         }
1322
1323                         iedata += copy;
1324                         iedatalen -= copy;
1325                         attr_remaining = attr_len - copy;
1326                 }
1327
1328  cont:
1329                 len -= ies[1] + 2;
1330                 ies += ies[1] + 2;
1331         }
1332
1333         if (attr_remaining && desired_attr)
1334                 return -EILSEQ;
1335
1336         return -ENOENT;
1337 }
1338 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1339
1340 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1341 {
1342         int i;
1343
1344         /* Make sure array values are legal */
1345         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1346                 return false;
1347
1348         i = 0;
1349         while (i < n_ids) {
1350                 if (ids[i] == WLAN_EID_EXTENSION) {
1351                         if (id_ext && (ids[i + 1] == id))
1352                                 return true;
1353
1354                         i += 2;
1355                         continue;
1356                 }
1357
1358                 if (ids[i] == id && !id_ext)
1359                         return true;
1360
1361                 i++;
1362         }
1363         return false;
1364 }
1365
1366 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1367 {
1368         /* we assume a validly formed IEs buffer */
1369         u8 len = ies[pos + 1];
1370
1371         pos += 2 + len;
1372
1373         /* the IE itself must have 255 bytes for fragments to follow */
1374         if (len < 255)
1375                 return pos;
1376
1377         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1378                 len = ies[pos + 1];
1379                 pos += 2 + len;
1380         }
1381
1382         return pos;
1383 }
1384
1385 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1386                               const u8 *ids, int n_ids,
1387                               const u8 *after_ric, int n_after_ric,
1388                               size_t offset)
1389 {
1390         size_t pos = offset;
1391
1392         while (pos < ielen) {
1393                 u8 ext = 0;
1394
1395                 if (ies[pos] == WLAN_EID_EXTENSION)
1396                         ext = 2;
1397                 if ((pos + ext) >= ielen)
1398                         break;
1399
1400                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1401                                           ies[pos] == WLAN_EID_EXTENSION))
1402                         break;
1403
1404                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1405                         pos = skip_ie(ies, ielen, pos);
1406
1407                         while (pos < ielen) {
1408                                 if (ies[pos] == WLAN_EID_EXTENSION)
1409                                         ext = 2;
1410                                 else
1411                                         ext = 0;
1412
1413                                 if ((pos + ext) >= ielen)
1414                                         break;
1415
1416                                 if (!ieee80211_id_in_list(after_ric,
1417                                                           n_after_ric,
1418                                                           ies[pos + ext],
1419                                                           ext == 2))
1420                                         pos = skip_ie(ies, ielen, pos);
1421                         }
1422                 } else {
1423                         pos = skip_ie(ies, ielen, pos);
1424                 }
1425         }
1426
1427         return pos;
1428 }
1429 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1430
1431 bool ieee80211_operating_class_to_band(u8 operating_class,
1432                                        enum nl80211_band *band)
1433 {
1434         switch (operating_class) {
1435         case 112:
1436         case 115 ... 127:
1437         case 128 ... 130:
1438                 *band = NL80211_BAND_5GHZ;
1439                 return true;
1440         case 81:
1441         case 82:
1442         case 83:
1443         case 84:
1444                 *band = NL80211_BAND_2GHZ;
1445                 return true;
1446         case 180:
1447                 *band = NL80211_BAND_60GHZ;
1448                 return true;
1449         }
1450
1451         return false;
1452 }
1453 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1454
1455 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1456                                           u8 *op_class)
1457 {
1458         u8 vht_opclass;
1459         u16 freq = chandef->center_freq1;
1460
1461         if (freq >= 2412 && freq <= 2472) {
1462                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1463                         return false;
1464
1465                 /* 2.407 GHz, channels 1..13 */
1466                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1467                         if (freq > chandef->chan->center_freq)
1468                                 *op_class = 83; /* HT40+ */
1469                         else
1470                                 *op_class = 84; /* HT40- */
1471                 } else {
1472                         *op_class = 81;
1473                 }
1474
1475                 return true;
1476         }
1477
1478         if (freq == 2484) {
1479                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1480                         return false;
1481
1482                 *op_class = 82; /* channel 14 */
1483                 return true;
1484         }
1485
1486         switch (chandef->width) {
1487         case NL80211_CHAN_WIDTH_80:
1488                 vht_opclass = 128;
1489                 break;
1490         case NL80211_CHAN_WIDTH_160:
1491                 vht_opclass = 129;
1492                 break;
1493         case NL80211_CHAN_WIDTH_80P80:
1494                 vht_opclass = 130;
1495                 break;
1496         case NL80211_CHAN_WIDTH_10:
1497         case NL80211_CHAN_WIDTH_5:
1498                 return false; /* unsupported for now */
1499         default:
1500                 vht_opclass = 0;
1501                 break;
1502         }
1503
1504         /* 5 GHz, channels 36..48 */
1505         if (freq >= 5180 && freq <= 5240) {
1506                 if (vht_opclass) {
1507                         *op_class = vht_opclass;
1508                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1509                         if (freq > chandef->chan->center_freq)
1510                                 *op_class = 116;
1511                         else
1512                                 *op_class = 117;
1513                 } else {
1514                         *op_class = 115;
1515                 }
1516
1517                 return true;
1518         }
1519
1520         /* 5 GHz, channels 52..64 */
1521         if (freq >= 5260 && freq <= 5320) {
1522                 if (vht_opclass) {
1523                         *op_class = vht_opclass;
1524                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1525                         if (freq > chandef->chan->center_freq)
1526                                 *op_class = 119;
1527                         else
1528                                 *op_class = 120;
1529                 } else {
1530                         *op_class = 118;
1531                 }
1532
1533                 return true;
1534         }
1535
1536         /* 5 GHz, channels 100..144 */
1537         if (freq >= 5500 && freq <= 5720) {
1538                 if (vht_opclass) {
1539                         *op_class = vht_opclass;
1540                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1541                         if (freq > chandef->chan->center_freq)
1542                                 *op_class = 122;
1543                         else
1544                                 *op_class = 123;
1545                 } else {
1546                         *op_class = 121;
1547                 }
1548
1549                 return true;
1550         }
1551
1552         /* 5 GHz, channels 149..169 */
1553         if (freq >= 5745 && freq <= 5845) {
1554                 if (vht_opclass) {
1555                         *op_class = vht_opclass;
1556                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1557                         if (freq > chandef->chan->center_freq)
1558                                 *op_class = 126;
1559                         else
1560                                 *op_class = 127;
1561                 } else if (freq <= 5805) {
1562                         *op_class = 124;
1563                 } else {
1564                         *op_class = 125;
1565                 }
1566
1567                 return true;
1568         }
1569
1570         /* 56.16 GHz, channel 1..4 */
1571         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1572                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1573                         return false;
1574
1575                 *op_class = 180;
1576                 return true;
1577         }
1578
1579         /* not supported yet */
1580         return false;
1581 }
1582 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1583
1584 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1585                                        u32 *beacon_int_gcd,
1586                                        bool *beacon_int_different)
1587 {
1588         struct wireless_dev *wdev;
1589
1590         *beacon_int_gcd = 0;
1591         *beacon_int_different = false;
1592
1593         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1594                 if (!wdev->beacon_interval)
1595                         continue;
1596
1597                 if (!*beacon_int_gcd) {
1598                         *beacon_int_gcd = wdev->beacon_interval;
1599                         continue;
1600                 }
1601
1602                 if (wdev->beacon_interval == *beacon_int_gcd)
1603                         continue;
1604
1605                 *beacon_int_different = true;
1606                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1607         }
1608
1609         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1610                 if (*beacon_int_gcd)
1611                         *beacon_int_different = true;
1612                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1613         }
1614 }
1615
1616 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1617                                  enum nl80211_iftype iftype, u32 beacon_int)
1618 {
1619         /*
1620          * This is just a basic pre-condition check; if interface combinations
1621          * are possible the driver must already be checking those with a call
1622          * to cfg80211_check_combinations(), in which case we'll validate more
1623          * through the cfg80211_calculate_bi_data() call and code in
1624          * cfg80211_iter_combinations().
1625          */
1626
1627         if (beacon_int < 10 || beacon_int > 10000)
1628                 return -EINVAL;
1629
1630         return 0;
1631 }
1632
1633 int cfg80211_iter_combinations(struct wiphy *wiphy,
1634                                struct iface_combination_params *params,
1635                                void (*iter)(const struct ieee80211_iface_combination *c,
1636                                             void *data),
1637                                void *data)
1638 {
1639         const struct ieee80211_regdomain *regdom;
1640         enum nl80211_dfs_regions region = 0;
1641         int i, j, iftype;
1642         int num_interfaces = 0;
1643         u32 used_iftypes = 0;
1644         u32 beacon_int_gcd;
1645         bool beacon_int_different;
1646
1647         /*
1648          * This is a bit strange, since the iteration used to rely only on
1649          * the data given by the driver, but here it now relies on context,
1650          * in form of the currently operating interfaces.
1651          * This is OK for all current users, and saves us from having to
1652          * push the GCD calculations into all the drivers.
1653          * In the future, this should probably rely more on data that's in
1654          * cfg80211 already - the only thing not would appear to be any new
1655          * interfaces (while being brought up) and channel/radar data.
1656          */
1657         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1658                                    &beacon_int_gcd, &beacon_int_different);
1659
1660         if (params->radar_detect) {
1661                 rcu_read_lock();
1662                 regdom = rcu_dereference(cfg80211_regdomain);
1663                 if (regdom)
1664                         region = regdom->dfs_region;
1665                 rcu_read_unlock();
1666         }
1667
1668         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1669                 num_interfaces += params->iftype_num[iftype];
1670                 if (params->iftype_num[iftype] > 0 &&
1671                     !(wiphy->software_iftypes & BIT(iftype)))
1672                         used_iftypes |= BIT(iftype);
1673         }
1674
1675         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1676                 const struct ieee80211_iface_combination *c;
1677                 struct ieee80211_iface_limit *limits;
1678                 u32 all_iftypes = 0;
1679
1680                 c = &wiphy->iface_combinations[i];
1681
1682                 if (num_interfaces > c->max_interfaces)
1683                         continue;
1684                 if (params->num_different_channels > c->num_different_channels)
1685                         continue;
1686
1687                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1688                                  GFP_KERNEL);
1689                 if (!limits)
1690                         return -ENOMEM;
1691
1692                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1693                         if (wiphy->software_iftypes & BIT(iftype))
1694                                 continue;
1695                         for (j = 0; j < c->n_limits; j++) {
1696                                 all_iftypes |= limits[j].types;
1697                                 if (!(limits[j].types & BIT(iftype)))
1698                                         continue;
1699                                 if (limits[j].max < params->iftype_num[iftype])
1700                                         goto cont;
1701                                 limits[j].max -= params->iftype_num[iftype];
1702                         }
1703                 }
1704
1705                 if (params->radar_detect !=
1706                         (c->radar_detect_widths & params->radar_detect))
1707                         goto cont;
1708
1709                 if (params->radar_detect && c->radar_detect_regions &&
1710                     !(c->radar_detect_regions & BIT(region)))
1711                         goto cont;
1712
1713                 /* Finally check that all iftypes that we're currently
1714                  * using are actually part of this combination. If they
1715                  * aren't then we can't use this combination and have
1716                  * to continue to the next.
1717                  */
1718                 if ((all_iftypes & used_iftypes) != used_iftypes)
1719                         goto cont;
1720
1721                 if (beacon_int_gcd) {
1722                         if (c->beacon_int_min_gcd &&
1723                             beacon_int_gcd < c->beacon_int_min_gcd)
1724                                 goto cont;
1725                         if (!c->beacon_int_min_gcd && beacon_int_different)
1726                                 goto cont;
1727                 }
1728
1729                 /* This combination covered all interface types and
1730                  * supported the requested numbers, so we're good.
1731                  */
1732
1733                 (*iter)(c, data);
1734  cont:
1735                 kfree(limits);
1736         }
1737
1738         return 0;
1739 }
1740 EXPORT_SYMBOL(cfg80211_iter_combinations);
1741
1742 static void
1743 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1744                           void *data)
1745 {
1746         int *num = data;
1747         (*num)++;
1748 }
1749
1750 int cfg80211_check_combinations(struct wiphy *wiphy,
1751                                 struct iface_combination_params *params)
1752 {
1753         int err, num = 0;
1754
1755         err = cfg80211_iter_combinations(wiphy, params,
1756                                          cfg80211_iter_sum_ifcombs, &num);
1757         if (err)
1758                 return err;
1759         if (num == 0)
1760                 return -EBUSY;
1761
1762         return 0;
1763 }
1764 EXPORT_SYMBOL(cfg80211_check_combinations);
1765
1766 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1767                            const u8 *rates, unsigned int n_rates,
1768                            u32 *mask)
1769 {
1770         int i, j;
1771
1772         if (!sband)
1773                 return -EINVAL;
1774
1775         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1776                 return -EINVAL;
1777
1778         *mask = 0;
1779
1780         for (i = 0; i < n_rates; i++) {
1781                 int rate = (rates[i] & 0x7f) * 5;
1782                 bool found = false;
1783
1784                 for (j = 0; j < sband->n_bitrates; j++) {
1785                         if (sband->bitrates[j].bitrate == rate) {
1786                                 found = true;
1787                                 *mask |= BIT(j);
1788                                 break;
1789                         }
1790                 }
1791                 if (!found)
1792                         return -EINVAL;
1793         }
1794
1795         /*
1796          * mask must have at least one bit set here since we
1797          * didn't accept a 0-length rates array nor allowed
1798          * entries in the array that didn't exist
1799          */
1800
1801         return 0;
1802 }
1803
1804 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1805 {
1806         enum nl80211_band band;
1807         unsigned int n_channels = 0;
1808
1809         for (band = 0; band < NUM_NL80211_BANDS; band++)
1810                 if (wiphy->bands[band])
1811                         n_channels += wiphy->bands[band]->n_channels;
1812
1813         return n_channels;
1814 }
1815 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1816
1817 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1818                          struct station_info *sinfo)
1819 {
1820         struct cfg80211_registered_device *rdev;
1821         struct wireless_dev *wdev;
1822
1823         wdev = dev->ieee80211_ptr;
1824         if (!wdev)
1825                 return -EOPNOTSUPP;
1826
1827         rdev = wiphy_to_rdev(wdev->wiphy);
1828         if (!rdev->ops->get_station)
1829                 return -EOPNOTSUPP;
1830
1831         memset(sinfo, 0, sizeof(*sinfo));
1832
1833         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1834 }
1835 EXPORT_SYMBOL(cfg80211_get_station);
1836
1837 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1838 {
1839         int i;
1840
1841         if (!f)
1842                 return;
1843
1844         kfree(f->serv_spec_info);
1845         kfree(f->srf_bf);
1846         kfree(f->srf_macs);
1847         for (i = 0; i < f->num_rx_filters; i++)
1848                 kfree(f->rx_filters[i].filter);
1849
1850         for (i = 0; i < f->num_tx_filters; i++)
1851                 kfree(f->tx_filters[i].filter);
1852
1853         kfree(f->rx_filters);
1854         kfree(f->tx_filters);
1855         kfree(f);
1856 }
1857 EXPORT_SYMBOL(cfg80211_free_nan_func);
1858
1859 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1860                                 u32 center_freq_khz, u32 bw_khz)
1861 {
1862         u32 start_freq_khz, end_freq_khz;
1863
1864         start_freq_khz = center_freq_khz - (bw_khz / 2);
1865         end_freq_khz = center_freq_khz + (bw_khz / 2);
1866
1867         if (start_freq_khz >= freq_range->start_freq_khz &&
1868             end_freq_khz <= freq_range->end_freq_khz)
1869                 return true;
1870
1871         return false;
1872 }
1873
1874 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
1875 {
1876         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
1877                                 sizeof(*(sinfo->pertid)),
1878                                 gfp);
1879         if (!sinfo->pertid)
1880                 return -ENOMEM;
1881
1882         return 0;
1883 }
1884 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
1885
1886 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1887 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1888 const unsigned char rfc1042_header[] __aligned(2) =
1889         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1890 EXPORT_SYMBOL(rfc1042_header);
1891
1892 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1893 const unsigned char bridge_tunnel_header[] __aligned(2) =
1894         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1895 EXPORT_SYMBOL(bridge_tunnel_header);