net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/export.h>
   7 #include <linux/bitops.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/slab.h>
  10 #include <net/cfg80211.h>
  11 #include <net/ip.h>
  12 #include <net/dsfield.h>
  13 #include "core.h"
  14 #include "rdev-ops.h"
  15
  16
  17 struct ieee80211_rate *
  18 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  19                             u32 basic_rates, int bitrate)
  20 {
  21         struct ieee80211_rate *result = &sband->bitrates[0];
  22         int i;
  23
  24         for (i = 0; i < sband->n_bitrates; i++) {
  25                 if (!(basic_rates & BIT(i)))
  26                         continue;
  27                 if (sband->bitrates[i].bitrate > bitrate)
  28                         continue;
  29                 result = &sband->bitrates[i];
  30         }
  31
  32         return result;
  33 }
  34 EXPORT_SYMBOL(ieee80211_get_response_rate);
  35
  36 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  37 {
  38         /* see 802.11 17.3.8.3.2 and Annex J
  39          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  40         if (chan <= 0)
  41                 return 0; /* not supported */
  42         switch (band) {
  43         case IEEE80211_BAND_2GHZ:
  44                 if (chan == 14)
  45                         return 2484;
  46                 else if (chan < 14)
  47                         return 2407 + chan * 5;
  48                 break;
  49         case IEEE80211_BAND_5GHZ:
  50                 if (chan >= 182 && chan <= 196)
  51                         return 4000 + chan * 5;
  52                 else
  53                         return 5000 + chan * 5;
  54                 break;
  55         case IEEE80211_BAND_60GHZ:
  56                 if (chan < 5)
  57                         return 56160 + chan * 2160;
  58                 break;
  59         default:
  60                 ;
  61         }
  62         return 0; /* not supported */
  63 }
  64 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  65
  66 int ieee80211_frequency_to_channel(int freq)
  67 {
  68         /* see 802.11 17.3.8.3.2 and Annex J */
  69         if (freq == 2484)
  70                 return 14;
  71         else if (freq < 2484)
  72                 return (freq - 2407) / 5;
  73         else if (freq >= 4910 && freq <= 4980)
  74                 return (freq - 4000) / 5;
  75         else if (freq <= 45000) /* DMG band lower limit */
  76                 return (freq - 5000) / 5;
  77         else if (freq >= 58320 && freq <= 64800)
  78                 return (freq - 56160) / 2160;
  79         else
  80                 return 0;
  81 }
  82 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
  83
  84 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
  85                                                   int freq)
  86 {
  87         enum ieee80211_band band;
  88         struct ieee80211_supported_band *sband;
  89         int i;
  90
  91         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  92                 sband = wiphy->bands[band];
  93
  94                 if (!sband)
  95                         continue;
  96
  97                 for (i = 0; i < sband->n_channels; i++) {
  98                         if (sband->channels[i].center_freq == freq)
  99                                 return &sband->channels[i];
 100                 }
 101         }
 102
 103         return NULL;
 104 }
 105 EXPORT_SYMBOL(__ieee80211_get_channel);
 106
 107 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 108                                      enum ieee80211_band band)
 109 {
 110         int i, want;
 111
 112         switch (band) {
 113         case IEEE80211_BAND_5GHZ:
 114                 want = 3;
 115                 for (i = 0; i < sband->n_bitrates; i++) {
 116                         if (sband->bitrates[i].bitrate == 60 ||
 117                             sband->bitrates[i].bitrate == 120 ||
 118                             sband->bitrates[i].bitrate == 240) {
 119                                 sband->bitrates[i].flags |=
 120                                         IEEE80211_RATE_MANDATORY_A;
 121                                 want--;
 122                         }
 123                 }
 124                 WARN_ON(want);
 125                 break;
 126         case IEEE80211_BAND_2GHZ:
 127                 want = 7;
 128                 for (i = 0; i < sband->n_bitrates; i++) {
 129                         if (sband->bitrates[i].bitrate == 10) {
 130                                 sband->bitrates[i].flags |=
 131                                         IEEE80211_RATE_MANDATORY_B |
 132                                         IEEE80211_RATE_MANDATORY_G;
 133                                 want--;
 134                         }
 135
 136                         if (sband->bitrates[i].bitrate == 20 ||
 137                             sband->bitrates[i].bitrate == 55 ||
 138                             sband->bitrates[i].bitrate == 110 ||
 139                             sband->bitrates[i].bitrate == 60 ||
 140                             sband->bitrates[i].bitrate == 120 ||
 141                             sband->bitrates[i].bitrate == 240) {
 142                                 sband->bitrates[i].flags |=
 143                                         IEEE80211_RATE_MANDATORY_G;
 144                                 want--;
 145                         }
 146
 147                         if (sband->bitrates[i].bitrate != 10 &&
 148                             sband->bitrates[i].bitrate != 20 &&
 149                             sband->bitrates[i].bitrate != 55 &&
 150                             sband->bitrates[i].bitrate != 110)
 151                                 sband->bitrates[i].flags |=
 152                                         IEEE80211_RATE_ERP_G;
 153                 }
 154                 WARN_ON(want != 0 && want != 3 && want != 6);
 155                 break;
 156         case IEEE80211_BAND_60GHZ:
 157                 /* check for mandatory HT MCS 1..4 */
 158                 WARN_ON(!sband->ht_cap.ht_supported);
 159                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 160                 break;
 161         case IEEE80211_NUM_BANDS:
 162                 WARN_ON(1);
 163                 break;
 164         }
 165 }
 166
 167 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 168 {
 169         enum ieee80211_band band;
 170
 171         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 172                 if (wiphy->bands[band])
 173                         set_mandatory_flags_band(wiphy->bands[band], band);
 174 }
 175
 176 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 177 {
 178         int i;
 179         for (i = 0; i < wiphy->n_cipher_suites; i++)
 180                 if (cipher == wiphy->cipher_suites[i])
 181                         return true;
 182         return false;
 183 }
 184
 185 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 186                                    struct key_params *params, int key_idx,
 187                                    bool pairwise, const u8 *mac_addr)
 188 {
 189         if (key_idx > 5)
 190                 return -EINVAL;
 191
 192         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 193                 return -EINVAL;
 194
 195         if (pairwise && !mac_addr)
 196                 return -EINVAL;
 197
 198         /*
 199          * Disallow pairwise keys with non-zero index unless it's WEP
 200          * or a vendor specific cipher (because current deployments use
 201          * pairwise WEP keys with non-zero indices and for vendor specific
 202          * ciphers this should be validated in the driver or hardware level
 203          * - but 802.11i clearly specifies to use zero)
 204          */
 205         if (pairwise && key_idx &&
 206             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 207              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 208              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 209                 return -EINVAL;
 210
 211         switch (params->cipher) {
 212         case WLAN_CIPHER_SUITE_WEP40:
 213                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 214                         return -EINVAL;
 215                 break;
 216         case WLAN_CIPHER_SUITE_TKIP:
 217                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 218                         return -EINVAL;
 219                 break;
 220         case WLAN_CIPHER_SUITE_CCMP:
 221                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 222                         return -EINVAL;
 223                 break;
 224         case WLAN_CIPHER_SUITE_WEP104:
 225                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 226                         return -EINVAL;
 227                 break;
 228         case WLAN_CIPHER_SUITE_AES_CMAC:
 229                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 230                         return -EINVAL;
 231                 break;
 232         default:
 233                 /*
 234                  * We don't know anything about this algorithm,
 235                  * allow using it -- but the driver must check
 236                  * all parameters! We still check below whether
 237                  * or not the driver supports this algorithm,
 238                  * of course.
 239                  */
 240                 break;
 241         }
 242
 243         if (params->seq) {
 244                 switch (params->cipher) {
 245                 case WLAN_CIPHER_SUITE_WEP40:
 246                 case WLAN_CIPHER_SUITE_WEP104:
 247                         /* These ciphers do not use key sequence */
 248                         return -EINVAL;
 249                 case WLAN_CIPHER_SUITE_TKIP:
 250                 case WLAN_CIPHER_SUITE_CCMP:
 251                 case WLAN_CIPHER_SUITE_AES_CMAC:
 252                         if (params->seq_len != 6)
 253                                 return -EINVAL;
 254                         break;
 255                 }
 256         }
 257
 258         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 259                 return -EINVAL;
 260
 261         return 0;
 262 }
 263
 264 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 265 {
 266         unsigned int hdrlen = 24;
 267
 268         if (ieee80211_is_data(fc)) {
 269                 if (ieee80211_has_a4(fc))
 270                         hdrlen = 30;
 271                 if (ieee80211_is_data_qos(fc)) {
 272                         hdrlen += IEEE80211_QOS_CTL_LEN;
 273                         if (ieee80211_has_order(fc))
 274                                 hdrlen += IEEE80211_HT_CTL_LEN;
 275                 }
 276                 goto out;
 277         }
 278
 279         if (ieee80211_is_ctl(fc)) {
 280                 /*
 281                  * ACK and CTS are 10 bytes, all others 16. To see how
 282                  * to get this condition consider
 283                  *   subtype mask:   0b0000000011110000 (0x00F0)
 284                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 285                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 286                  *   bits that matter:         ^^^      (0x00E0)
 287                  *   value of those: 0b0000000011000000 (0x00C0)
 288                  */
 289                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 290                         hdrlen = 10;
 291                 else
 292                         hdrlen = 16;
 293         }
 294 out:
 295         return hdrlen;
 296 }
 297 EXPORT_SYMBOL(ieee80211_hdrlen);
 298
 299 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 300 {
 301         const struct ieee80211_hdr *hdr =
 302                         (const struct ieee80211_hdr *)skb->data;
 303         unsigned int hdrlen;
 304
 305         if (unlikely(skb->len < 10))
 306                 return 0;
 307         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 308         if (unlikely(hdrlen > skb->len))
 309                 return 0;
 310         return hdrlen;
 311 }
 312 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 313
 314 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 315 {
 316         int ae = meshhdr->flags & MESH_FLAGS_AE;
 317         /* 7.1.3.5a.2 */
 318         switch (ae) {
 319         case 0:
 320                 return 6;
 321         case MESH_FLAGS_AE_A4:
 322                 return 12;
 323         case MESH_FLAGS_AE_A5_A6:
 324                 return 18;
 325         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 326                 return 24;
 327         default:
 328                 return 6;
 329         }
 330 }
 331
 332 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 333                            enum nl80211_iftype iftype)
 334 {
 335         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 336         u16 hdrlen, ethertype;
 337         u8 *payload;
 338         u8 dst[ETH_ALEN];
 339         u8 src[ETH_ALEN] __aligned(2);
 340
 341         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 342                 return -1;
 343
 344         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 345
 346         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 347          * header
 348          * IEEE 802.11 address fields:
 349          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 350          *   0     0   DA    SA    BSSID n/a
 351          *   0     1   DA    BSSID SA    n/a
 352          *   1     0   BSSID SA    DA    n/a
 353          *   1     1   RA    TA    DA    SA
 354          */
 355         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 356         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 357
 358         switch (hdr->frame_control &
 359                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 360         case cpu_to_le16(IEEE80211_FCTL_TODS):
 361                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 362                              iftype != NL80211_IFTYPE_AP_VLAN &&
 363                              iftype != NL80211_IFTYPE_P2P_GO))
 364                         return -1;
 365                 break;
 366         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 367                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 368                              iftype != NL80211_IFTYPE_MESH_POINT &&
 369                              iftype != NL80211_IFTYPE_AP_VLAN &&
 370                              iftype != NL80211_IFTYPE_STATION))
 371                         return -1;
 372                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 373                         struct ieee80211s_hdr *meshdr =
 374                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 375                         /* make sure meshdr->flags is on the linear part */
 376                         if (!pskb_may_pull(skb, hdrlen + 1))
 377                                 return -1;
 378                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 379                                 skb_copy_bits(skb, hdrlen +
 380                                         offsetof(struct ieee80211s_hdr, eaddr1),
 381                                         dst, ETH_ALEN);
 382                                 skb_copy_bits(skb, hdrlen +
 383                                         offsetof(struct ieee80211s_hdr, eaddr2),
 384                                         src, ETH_ALEN);
 385                         }
 386                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 387                 }
 388                 break;
 389         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 390                 if ((iftype != NL80211_IFTYPE_STATION &&
 391                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 392                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 393                     (is_multicast_ether_addr(dst) &&
 394                      ether_addr_equal(src, addr)))
 395                         return -1;
 396                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 397                         struct ieee80211s_hdr *meshdr =
 398                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 399                         /* make sure meshdr->flags is on the linear part */
 400                         if (!pskb_may_pull(skb, hdrlen + 1))
 401                                 return -1;
 402                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 403                                 skb_copy_bits(skb, hdrlen +
 404                                         offsetof(struct ieee80211s_hdr, eaddr1),
 405                                         src, ETH_ALEN);
 406                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 407                 }
 408                 break;
 409         case cpu_to_le16(0):
 410                 if (iftype != NL80211_IFTYPE_ADHOC &&
 411                     iftype != NL80211_IFTYPE_STATION)
 412                                 return -1;
 413                 break;
 414         }
 415
 416         if (!pskb_may_pull(skb, hdrlen + 8))
 417                 return -1;
 418
 419         payload = skb->data + hdrlen;
 420         ethertype = (payload[6] << 8) | payload[7];
 421
 422         if (likely((ether_addr_equal(payload, rfc1042_header) &&
 423                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 424                    ether_addr_equal(payload, bridge_tunnel_header))) {
 425                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 426                  * replace EtherType */
 427                 skb_pull(skb, hdrlen + 6);
 428                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 429                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 430         } else {
 431                 struct ethhdr *ehdr;
 432                 __be16 len;
 433
 434                 skb_pull(skb, hdrlen);
 435                 len = htons(skb->len);
 436                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 437                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 438                 memcpy(ehdr->h_source, src, ETH_ALEN);
 439                 ehdr->h_proto = len;
 440         }
 441         return 0;
 442 }
 443 EXPORT_SYMBOL(ieee80211_data_to_8023);
 444
 445 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 446                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 447 {
 448         struct ieee80211_hdr hdr;
 449         u16 hdrlen, ethertype;
 450         __le16 fc;
 451         const u8 *encaps_data;
 452         int encaps_len, skip_header_bytes;
 453         int nh_pos, h_pos;
 454         int head_need;
 455
 456         if (unlikely(skb->len < ETH_HLEN))
 457                 return -EINVAL;
 458
 459         nh_pos = skb_network_header(skb) - skb->data;
 460         h_pos = skb_transport_header(skb) - skb->data;
 461
 462         /* convert Ethernet header to proper 802.11 header (based on
 463          * operation mode) */
 464         ethertype = (skb->data[12] << 8) | skb->data[13];
 465         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 466
 467         switch (iftype) {
 468         case NL80211_IFTYPE_AP:
 469         case NL80211_IFTYPE_AP_VLAN:
 470         case NL80211_IFTYPE_P2P_GO:
 471                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 472                 /* DA BSSID SA */
 473                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 474                 memcpy(hdr.addr2, addr, ETH_ALEN);
 475                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 476                 hdrlen = 24;
 477                 break;
 478         case NL80211_IFTYPE_STATION:
 479         case NL80211_IFTYPE_P2P_CLIENT:
 480                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 481                 /* BSSID SA DA */
 482                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 483                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 484                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 485                 hdrlen = 24;
 486                 break;
 487         case NL80211_IFTYPE_ADHOC:
 488                 /* DA SA BSSID */
 489                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 490                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 491                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 492                 hdrlen = 24;
 493                 break;
 494         default:
 495                 return -EOPNOTSUPP;
 496         }
 497
 498         if (qos) {
 499                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 500                 hdrlen += 2;
 501         }
 502
 503         hdr.frame_control = fc;
 504         hdr.duration_id = 0;
 505         hdr.seq_ctrl = 0;
 506
 507         skip_header_bytes = ETH_HLEN;
 508         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 509                 encaps_data = bridge_tunnel_header;
 510                 encaps_len = sizeof(bridge_tunnel_header);
 511                 skip_header_bytes -= 2;
 512         } else if (ethertype > 0x600) {
 513                 encaps_data = rfc1042_header;
 514                 encaps_len = sizeof(rfc1042_header);
 515                 skip_header_bytes -= 2;
 516         } else {
 517                 encaps_data = NULL;
 518                 encaps_len = 0;
 519         }
 520
 521         skb_pull(skb, skip_header_bytes);
 522         nh_pos -= skip_header_bytes;
 523         h_pos -= skip_header_bytes;
 524
 525         head_need = hdrlen + encaps_len - skb_headroom(skb);
 526
 527         if (head_need > 0 || skb_cloned(skb)) {
 528                 head_need = max(head_need, 0);
 529                 if (head_need)
 530                         skb_orphan(skb);
 531
 532                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 533                         return -ENOMEM;
 534
 535                 skb->truesize += head_need;
 536         }
 537
 538         if (encaps_data) {
 539                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 540                 nh_pos += encaps_len;
 541                 h_pos += encaps_len;
 542         }
 543
 544         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 545
 546         nh_pos += hdrlen;
 547         h_pos += hdrlen;
 548
 549         /* Update skb pointers to various headers since this modified frame
 550          * is going to go through Linux networking code that may potentially
 551          * need things like pointer to IP header. */
 552         skb_set_mac_header(skb, 0);
 553         skb_set_network_header(skb, nh_pos);
 554         skb_set_transport_header(skb, h_pos);
 555
 556         return 0;
 557 }
 558 EXPORT_SYMBOL(ieee80211_data_from_8023);
 559
 560
 561 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 562                               const u8 *addr, enum nl80211_iftype iftype,
 563                               const unsigned int extra_headroom,
 564                               bool has_80211_header)
 565 {
 566         struct sk_buff *frame = NULL;
 567         u16 ethertype;
 568         u8 *payload;
 569         const struct ethhdr *eth;
 570         int remaining, err;
 571         u8 dst[ETH_ALEN], src[ETH_ALEN];
 572
 573         if (has_80211_header) {
 574                 err = ieee80211_data_to_8023(skb, addr, iftype);
 575                 if (err)
 576                         goto out;
 577
 578                 /* skip the wrapping header */
 579                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 580                 if (!eth)
 581                         goto out;
 582         } else {
 583                 eth = (struct ethhdr *) skb->data;
 584         }
 585
 586         while (skb != frame) {
 587                 u8 padding;
 588                 __be16 len = eth->h_proto;
 589                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 590
 591                 remaining = skb->len;
 592                 memcpy(dst, eth->h_dest, ETH_ALEN);
 593                 memcpy(src, eth->h_source, ETH_ALEN);
 594
 595                 padding = (4 - subframe_len) & 0x3;
 596                 /* the last MSDU has no padding */
 597                 if (subframe_len > remaining)
 598                         goto purge;
 599
 600                 skb_pull(skb, sizeof(struct ethhdr));
 601                 /* reuse skb for the last subframe */
 602                 if (remaining <= subframe_len + padding)
 603                         frame = skb;
 604                 else {
 605                         unsigned int hlen = ALIGN(extra_headroom, 4);
 606                         /*
 607                          * Allocate and reserve two bytes more for payload
 608                          * alignment since sizeof(struct ethhdr) is 14.
 609                          */
 610                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 611                         if (!frame)
 612                                 goto purge;
 613
 614                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 615                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 616                                 ntohs(len));
 617
 618                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 619                                                         padding);
 620                         if (!eth) {
 621                                 dev_kfree_skb(frame);
 622                                 goto purge;
 623                         }
 624                 }
 625
 626                 skb_reset_network_header(frame);
 627                 frame->dev = skb->dev;
 628                 frame->priority = skb->priority;
 629
 630                 payload = frame->data;
 631                 ethertype = (payload[6] << 8) | payload[7];
 632
 633                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 634                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 635                            ether_addr_equal(payload, bridge_tunnel_header))) {
 636                         /* remove RFC1042 or Bridge-Tunnel
 637                          * encapsulation and replace EtherType */
 638                         skb_pull(frame, 6);
 639                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 640                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 641                 } else {
 642                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 643                                 sizeof(__be16));
 644                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 645                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 646                 }
 647                 __skb_queue_tail(list, frame);
 648         }
 649
 650         return;
 651
 652  purge:
 653         __skb_queue_purge(list);
 654  out:
 655         dev_kfree_skb(skb);
 656 }
 657 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 658
 659 /* Given a data frame determine the 802.1p/1d tag to use. */
 660 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 661 {
 662         unsigned int dscp;
 663
 664         /* skb->priority values from 256->263 are magic values to
 665          * directly indicate a specific 802.1d priority.  This is used
 666          * to allow 802.1d priority to be passed directly in from VLAN
 667          * tags, etc.
 668          */
 669         if (skb->priority >= 256 && skb->priority <= 263)
 670                 return skb->priority - 256;
 671
 672         switch (skb->protocol) {
 673         case htons(ETH_P_IP):
 674                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 675                 break;
 676         case htons(ETH_P_IPV6):
 677                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 678                 break;
 679         default:
 680                 return 0;
 681         }
 682
 683         return dscp >> 5;
 684 }
 685 EXPORT_SYMBOL(cfg80211_classify8021d);
 686
 687 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 688 {
 689         if (bss->information_elements == NULL)
 690                 return NULL;
 691         return cfg80211_find_ie(ie, bss->information_elements,
 692                                  bss->len_information_elements);
 693 }
 694 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 695
 696 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 697 {
 698         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 699         struct net_device *dev = wdev->netdev;
 700         int i;
 701
 702         if (!wdev->connect_keys)
 703                 return;
 704
 705         for (i = 0; i < 6; i++) {
 706                 if (!wdev->connect_keys->params[i].cipher)
 707                         continue;
 708                 if (rdev_add_key(rdev, dev, i, false, NULL,
 709                                  &wdev->connect_keys->params[i])) {
 710                         netdev_err(dev, "failed to set key %d\n", i);
 711                         continue;
 712                 }
 713                 if (wdev->connect_keys->def == i)
 714                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
 715                                 netdev_err(dev, "failed to set defkey %d\n", i);
 716                                 continue;
 717                         }
 718                 if (wdev->connect_keys->defmgmt == i)
 719                         if (rdev_set_default_mgmt_key(rdev, dev, i))
 720                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
 721         }
 722
 723         kfree(wdev->connect_keys);
 724         wdev->connect_keys = NULL;
 725 }
 726
 727 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 728 {
 729         struct cfg80211_event *ev;
 730         unsigned long flags;
 731         const u8 *bssid = NULL;
 732
 733         spin_lock_irqsave(&wdev->event_lock, flags);
 734         while (!list_empty(&wdev->event_list)) {
 735                 ev = list_first_entry(&wdev->event_list,
 736                                       struct cfg80211_event, list);
 737                 list_del(&ev->list);
 738                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 739
 740                 wdev_lock(wdev);
 741                 switch (ev->type) {
 742                 case EVENT_CONNECT_RESULT:
 743                         if (!is_zero_ether_addr(ev->cr.bssid))
 744                                 bssid = ev->cr.bssid;
 745                         __cfg80211_connect_result(
 746                                 wdev->netdev, bssid,
 747                                 ev->cr.req_ie, ev->cr.req_ie_len,
 748                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 749                                 ev->cr.status,
 750                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 751                                 NULL);
 752                         break;
 753                 case EVENT_ROAMED:
 754                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 755                                           ev->rm.req_ie_len, ev->rm.resp_ie,
 756                                           ev->rm.resp_ie_len);
 757                         break;
 758                 case EVENT_DISCONNECTED:
 759                         __cfg80211_disconnected(wdev->netdev,
 760                                                 ev->dc.ie, ev->dc.ie_len,
 761                                                 ev->dc.reason, true);
 762                         break;
 763                 case EVENT_IBSS_JOINED:
 764                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 765                         break;
 766                 }
 767                 wdev_unlock(wdev);
 768
 769                 kfree(ev);
 770
 771                 spin_lock_irqsave(&wdev->event_lock, flags);
 772         }
 773         spin_unlock_irqrestore(&wdev->event_lock, flags);
 774 }
 775
 776 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 777 {
 778         struct wireless_dev *wdev;
 779
 780         ASSERT_RTNL();
 781         ASSERT_RDEV_LOCK(rdev);
 782
 783         mutex_lock(&rdev->devlist_mtx);
 784
 785         list_for_each_entry(wdev, &rdev->wdev_list, list)
 786                 cfg80211_process_wdev_events(wdev);
 787
 788         mutex_unlock(&rdev->devlist_mtx);
 789 }
 790
 791 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 792                           struct net_device *dev, enum nl80211_iftype ntype,
 793                           u32 *flags, struct vif_params *params)
 794 {
 795         int err;
 796         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 797
 798         ASSERT_RDEV_LOCK(rdev);
 799
 800         /* don't support changing VLANs, you just re-create them */
 801         if (otype == NL80211_IFTYPE_AP_VLAN)
 802                 return -EOPNOTSUPP;
 803
 804         /* cannot change into P2P device type */
 805         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
 806                 return -EOPNOTSUPP;
 807
 808         if (!rdev->ops->change_virtual_intf ||
 809             !(rdev->wiphy.interface_modes & (1 << ntype)))
 810                 return -EOPNOTSUPP;
 811
 812         /* if it's part of a bridge, reject changing type to station/ibss */
 813         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 814             (ntype == NL80211_IFTYPE_ADHOC ||
 815              ntype == NL80211_IFTYPE_STATION ||
 816              ntype == NL80211_IFTYPE_P2P_CLIENT))
 817                 return -EBUSY;
 818
 819         if (ntype != otype && netif_running(dev)) {
 820                 mutex_lock(&rdev->devlist_mtx);
 821                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 822                                                     ntype);
 823                 mutex_unlock(&rdev->devlist_mtx);
 824                 if (err)
 825                         return err;
 826
 827                 dev->ieee80211_ptr->use_4addr = false;
 828                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 829
 830                 switch (otype) {
 831                 case NL80211_IFTYPE_AP:
 832                         cfg80211_stop_ap(rdev, dev);
 833                         break;
 834                 case NL80211_IFTYPE_ADHOC:
 835                         cfg80211_leave_ibss(rdev, dev, false);
 836                         break;
 837                 case NL80211_IFTYPE_STATION:
 838                 case NL80211_IFTYPE_P2P_CLIENT:
 839                         cfg80211_disconnect(rdev, dev,
 840                                             WLAN_REASON_DEAUTH_LEAVING, true);
 841                         break;
 842                 case NL80211_IFTYPE_MESH_POINT:
 843                         /* mesh should be handled? */
 844                         break;
 845                 default:
 846                         break;
 847                 }
 848
 849                 cfg80211_process_rdev_events(rdev);
 850         }
 851
 852         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
 853
 854         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 855
 856         if (!err && params && params->use_4addr != -1)
 857                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 858
 859         if (!err) {
 860                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 861                 switch (ntype) {
 862                 case NL80211_IFTYPE_STATION:
 863                         if (dev->ieee80211_ptr->use_4addr)
 864                                 break;
 865                         /* fall through */
 866                 case NL80211_IFTYPE_P2P_CLIENT:
 867                 case NL80211_IFTYPE_ADHOC:
 868                         dev->priv_flags |= IFF_DONT_BRIDGE;
 869                         break;
 870                 case NL80211_IFTYPE_P2P_GO:
 871                 case NL80211_IFTYPE_AP:
 872                 case NL80211_IFTYPE_AP_VLAN:
 873                 case NL80211_IFTYPE_WDS:
 874                 case NL80211_IFTYPE_MESH_POINT:
 875                         /* bridging OK */
 876                         break;
 877                 case NL80211_IFTYPE_MONITOR:
 878                         /* monitor can't bridge anyway */
 879                         break;
 880                 case NL80211_IFTYPE_UNSPECIFIED:
 881                 case NUM_NL80211_IFTYPES:
 882                         /* not happening */
 883                         break;
 884                 case NL80211_IFTYPE_P2P_DEVICE:
 885                         WARN_ON(1);
 886                         break;
 887                 }
 888         }
 889
 890         if (!err && ntype != otype && netif_running(dev)) {
 891                 cfg80211_update_iface_num(rdev, ntype, 1);
 892                 cfg80211_update_iface_num(rdev, otype, -1);
 893         }
 894
 895         return err;
 896 }
 897
 898 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 899 {
 900         static const u32 __mcs2bitrate[] = {
 901                 /* control PHY */
 902                 [0] =   275,
 903                 /* SC PHY */
 904                 [1] =  3850,
 905                 [2] =  7700,
 906                 [3] =  9625,
 907                 [4] = 11550,
 908                 [5] = 12512, /* 1251.25 mbps */
 909                 [6] = 15400,
 910                 [7] = 19250,
 911                 [8] = 23100,
 912                 [9] = 25025,
 913                 [10] = 30800,
 914                 [11] = 38500,
 915                 [12] = 46200,
 916                 /* OFDM PHY */
 917                 [13] =  6930,
 918                 [14] =  8662, /* 866.25 mbps */
 919                 [15] = 13860,
 920                 [16] = 17325,
 921                 [17] = 20790,
 922                 [18] = 27720,
 923                 [19] = 34650,
 924                 [20] = 41580,
 925                 [21] = 45045,
 926                 [22] = 51975,
 927                 [23] = 62370,
 928                 [24] = 67568, /* 6756.75 mbps */
 929                 /* LP-SC PHY */
 930                 [25] =  6260,
 931                 [26] =  8340,
 932                 [27] = 11120,
 933                 [28] = 12510,
 934                 [29] = 16680,
 935                 [30] = 22240,
 936                 [31] = 25030,
 937         };
 938
 939         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
 940                 return 0;
 941
 942         return __mcs2bitrate[rate->mcs];
 943 }
 944
 945 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
 946 {
 947         int modulation, streams, bitrate;
 948
 949         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 950                 return rate->legacy;
 951         if (rate->flags & RATE_INFO_FLAGS_60G)
 952                 return cfg80211_calculate_bitrate_60g(rate);
 953
 954         /* the formula below does only work for MCS values smaller than 32 */
 955         if (WARN_ON_ONCE(rate->mcs >= 32))
 956                 return 0;
 957
 958         modulation = rate->mcs & 7;
 959         streams = (rate->mcs >> 3) + 1;
 960
 961         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 962                         13500000 : 6500000;
 963
 964         if (modulation < 4)
 965                 bitrate *= (modulation + 1);
 966         else if (modulation == 4)
 967                 bitrate *= (modulation + 2);
 968         else
 969                 bitrate *= (modulation + 3);
 970
 971         bitrate *= streams;
 972
 973         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 974                 bitrate = (bitrate / 9) * 10;
 975
 976         /* do NOT round down here */
 977         return (bitrate + 50000) / 100000;
 978 }
 979 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
 980
 981 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 982                                  u32 beacon_int)
 983 {
 984         struct wireless_dev *wdev;
 985         int res = 0;
 986
 987         if (!beacon_int)
 988                 return -EINVAL;
 989
 990         mutex_lock(&rdev->devlist_mtx);
 991
 992         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 993                 if (!wdev->beacon_interval)
 994                         continue;
 995                 if (wdev->beacon_interval != beacon_int) {
 996                         res = -EINVAL;
 997                         break;
 998                 }
 999         }
1000
1001         mutex_unlock(&rdev->devlist_mtx);
1002
1003         return res;
1004 }
1005
1006 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1007                                  struct wireless_dev *wdev,
1008                                  enum nl80211_iftype iftype,
1009                                  struct ieee80211_channel *chan,
1010                                  enum cfg80211_chan_mode chanmode)
1011 {
1012         struct wireless_dev *wdev_iter;
1013         u32 used_iftypes = BIT(iftype);
1014         int num[NUM_NL80211_IFTYPES];
1015         struct ieee80211_channel
1016                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1017         struct ieee80211_channel *ch;
1018         enum cfg80211_chan_mode chmode;
1019         int num_different_channels = 0;
1020         int total = 1;
1021         int i, j;
1022
1023         ASSERT_RTNL();
1024         lockdep_assert_held(&rdev->devlist_mtx);
1025
1026         /* Always allow software iftypes */
1027         if (rdev->wiphy.software_iftypes & BIT(iftype))
1028                 return 0;
1029
1030         memset(num, 0, sizeof(num));
1031         memset(used_channels, 0, sizeof(used_channels));
1032
1033         num[iftype] = 1;
1034
1035         switch (chanmode) {
1036         case CHAN_MODE_UNDEFINED:
1037                 break;
1038         case CHAN_MODE_SHARED:
1039                 WARN_ON(!chan);
1040                 used_channels[0] = chan;
1041                 num_different_channels++;
1042                 break;
1043         case CHAN_MODE_EXCLUSIVE:
1044                 num_different_channels++;
1045                 break;
1046         }
1047
1048         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1049                 if (wdev_iter == wdev)
1050                         continue;
1051                 if (wdev_iter->netdev) {
1052                         if (!netif_running(wdev_iter->netdev))
1053                                 continue;
1054                 } else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1055                         if (!wdev_iter->p2p_started)
1056                                 continue;
1057                 } else {
1058                         WARN_ON(1);
1059                 }
1060
1061                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1062                         continue;
1063
1064                 /*
1065                  * We may be holding the "wdev" mutex, but now need to lock
1066                  * wdev_iter. This is OK because once we get here wdev_iter
1067                  * is not wdev (tested above), but we need to use the nested
1068                  * locking for lockdep.
1069                  */
1070                 mutex_lock_nested(&wdev_iter->mtx, 1);
1071                 __acquire(wdev_iter->mtx);
1072                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1073                 wdev_unlock(wdev_iter);
1074
1075                 switch (chmode) {
1076                 case CHAN_MODE_UNDEFINED:
1077                         break;
1078                 case CHAN_MODE_SHARED:
1079                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1080                                 if (!used_channels[i] || used_channels[i] == ch)
1081                                         break;
1082
1083                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1084                                 return -EBUSY;
1085
1086                         if (used_channels[i] == NULL) {
1087                                 used_channels[i] = ch;
1088                                 num_different_channels++;
1089                         }
1090                         break;
1091                 case CHAN_MODE_EXCLUSIVE:
1092                         num_different_channels++;
1093                         break;
1094                 }
1095
1096                 num[wdev_iter->iftype]++;
1097                 total++;
1098                 used_iftypes |= BIT(wdev_iter->iftype);
1099         }
1100
1101         if (total == 1)
1102                 return 0;
1103
1104         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1105                 const struct ieee80211_iface_combination *c;
1106                 struct ieee80211_iface_limit *limits;
1107                 u32 all_iftypes = 0;
1108
1109                 c = &rdev->wiphy.iface_combinations[i];
1110
1111                 if (total > c->max_interfaces)
1112                         continue;
1113                 if (num_different_channels > c->num_different_channels)
1114                         continue;
1115
1116                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1117                                  GFP_KERNEL);
1118                 if (!limits)
1119                         return -ENOMEM;
1120
1121                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1122                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1123                                 continue;
1124                         for (j = 0; j < c->n_limits; j++) {
1125                                 all_iftypes |= limits[j].types;
1126                                 if (!(limits[j].types & BIT(iftype)))
1127                                         continue;
1128                                 if (limits[j].max < num[iftype])
1129                                         goto cont;
1130                                 limits[j].max -= num[iftype];
1131                         }
1132                 }
1133
1134                 /*
1135                  * Finally check that all iftypes that we're currently
1136                  * using are actually part of this combination. If they
1137                  * aren't then we can't use this combination and have
1138                  * to continue to the next.
1139                  */
1140                 if ((all_iftypes & used_iftypes) != used_iftypes)
1141                         goto cont;
1142
1143                 /*
1144                  * This combination covered all interface types and
1145                  * supported the requested numbers, so we're good.
1146                  */
1147                 kfree(limits);
1148                 return 0;
1149  cont:
1150                 kfree(limits);
1151         }
1152
1153         return -EBUSY;
1154 }
1155
1156 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1157                            const u8 *rates, unsigned int n_rates,
1158                            u32 *mask)
1159 {
1160         int i, j;
1161
1162         if (!sband)
1163                 return -EINVAL;
1164
1165         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1166                 return -EINVAL;
1167
1168         *mask = 0;
1169
1170         for (i = 0; i < n_rates; i++) {
1171                 int rate = (rates[i] & 0x7f) * 5;
1172                 bool found = false;
1173
1174                 for (j = 0; j < sband->n_bitrates; j++) {
1175                         if (sband->bitrates[j].bitrate == rate) {
1176                                 found = true;
1177                                 *mask |= BIT(j);
1178                                 break;
1179                         }
1180                 }
1181                 if (!found)
1182                         return -EINVAL;
1183         }
1184
1185         /*
1186          * mask must have at least one bit set here since we
1187          * didn't accept a 0-length rates array nor allowed
1188          * entries in the array that didn't exist
1189          */
1190
1191         return 0;
1192 }
1193
1194 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1195 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1196 const unsigned char rfc1042_header[] __aligned(2) =
1197         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1198 EXPORT_SYMBOL(rfc1042_header);
1199
1200 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1201 const unsigned char bridge_tunnel_header[] __aligned(2) =
1202         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1203 EXPORT_SYMBOL(bridge_tunnel_header);