net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/bitops.h>
   7 #include <linux/etherdevice.h>
   8 #include <linux/slab.h>
   9 #include <net/cfg80211.h>
  10 #include <net/ip.h>
  11 #include "core.h"
  12
  13 struct ieee80211_rate *
  14 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  15                             u32 basic_rates, int bitrate)
  16 {
  17         struct ieee80211_rate *result = &sband->bitrates[0];
  18         int i;
  19
  20         for (i = 0; i < sband->n_bitrates; i++) {
  21                 if (!(basic_rates & BIT(i)))
  22                         continue;
  23                 if (sband->bitrates[i].bitrate > bitrate)
  24                         continue;
  25                 result = &sband->bitrates[i];
  26         }
  27
  28         return result;
  29 }
  30 EXPORT_SYMBOL(ieee80211_get_response_rate);
  31
  32 int ieee80211_channel_to_frequency(int chan)
  33 {
  34         if (chan < 14)
  35                 return 2407 + chan * 5;
  36
  37         if (chan == 14)
  38                 return 2484;
  39
  40         /* FIXME: 802.11j 17.3.8.3.2 */
  41         return (chan + 1000) * 5;
  42 }
  43 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  44
  45 int ieee80211_frequency_to_channel(int freq)
  46 {
  47         if (freq == 2484)
  48                 return 14;
  49
  50         if (freq < 2484)
  51                 return (freq - 2407) / 5;
  52
  53         /* FIXME: 802.11j 17.3.8.3.2 */
  54         return freq/5 - 1000;
  55 }
  56 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
  57
  58 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
  59                                                   int freq)
  60 {
  61         enum ieee80211_band band;
  62         struct ieee80211_supported_band *sband;
  63         int i;
  64
  65         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  66                 sband = wiphy->bands[band];
  67
  68                 if (!sband)
  69                         continue;
  70
  71                 for (i = 0; i < sband->n_channels; i++) {
  72                         if (sband->channels[i].center_freq == freq)
  73                                 return &sband->channels[i];
  74                 }
  75         }
  76
  77         return NULL;
  78 }
  79 EXPORT_SYMBOL(__ieee80211_get_channel);
  80
  81 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
  82                                      enum ieee80211_band band)
  83 {
  84         int i, want;
  85
  86         switch (band) {
  87         case IEEE80211_BAND_5GHZ:
  88                 want = 3;
  89                 for (i = 0; i < sband->n_bitrates; i++) {
  90                         if (sband->bitrates[i].bitrate == 60 ||
  91                             sband->bitrates[i].bitrate == 120 ||
  92                             sband->bitrates[i].bitrate == 240) {
  93                                 sband->bitrates[i].flags |=
  94                                         IEEE80211_RATE_MANDATORY_A;
  95                                 want--;
  96                         }
  97                 }
  98                 WARN_ON(want);
  99                 break;
 100         case IEEE80211_BAND_2GHZ:
 101                 want = 7;
 102                 for (i = 0; i < sband->n_bitrates; i++) {
 103                         if (sband->bitrates[i].bitrate == 10) {
 104                                 sband->bitrates[i].flags |=
 105                                         IEEE80211_RATE_MANDATORY_B |
 106                                         IEEE80211_RATE_MANDATORY_G;
 107                                 want--;
 108                         }
 109
 110                         if (sband->bitrates[i].bitrate == 20 ||
 111                             sband->bitrates[i].bitrate == 55 ||
 112                             sband->bitrates[i].bitrate == 110 ||
 113                             sband->bitrates[i].bitrate == 60 ||
 114                             sband->bitrates[i].bitrate == 120 ||
 115                             sband->bitrates[i].bitrate == 240) {
 116                                 sband->bitrates[i].flags |=
 117                                         IEEE80211_RATE_MANDATORY_G;
 118                                 want--;
 119                         }
 120
 121                         if (sband->bitrates[i].bitrate != 10 &&
 122                             sband->bitrates[i].bitrate != 20 &&
 123                             sband->bitrates[i].bitrate != 55 &&
 124                             sband->bitrates[i].bitrate != 110)
 125                                 sband->bitrates[i].flags |=
 126                                         IEEE80211_RATE_ERP_G;
 127                 }
 128                 WARN_ON(want != 0 && want != 3 && want != 6);
 129                 break;
 130         case IEEE80211_NUM_BANDS:
 131                 WARN_ON(1);
 132                 break;
 133         }
 134 }
 135
 136 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 137 {
 138         enum ieee80211_band band;
 139
 140         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 141                 if (wiphy->bands[band])
 142                         set_mandatory_flags_band(wiphy->bands[band], band);
 143 }
 144
 145 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 146                                    struct key_params *params, int key_idx,
 147                                    const u8 *mac_addr)
 148 {
 149         int i;
 150
 151         if (key_idx > 5)
 152                 return -EINVAL;
 153
 154         /*
 155          * Disallow pairwise keys with non-zero index unless it's WEP
 156          * (because current deployments use pairwise WEP keys with
 157          * non-zero indizes but 802.11i clearly specifies to use zero)
 158          */
 159         if (mac_addr && key_idx &&
 160             params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
 161             params->cipher != WLAN_CIPHER_SUITE_WEP104)
 162                 return -EINVAL;
 163
 164         switch (params->cipher) {
 165         case WLAN_CIPHER_SUITE_WEP40:
 166                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 167                         return -EINVAL;
 168                 break;
 169         case WLAN_CIPHER_SUITE_TKIP:
 170                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 171                         return -EINVAL;
 172                 break;
 173         case WLAN_CIPHER_SUITE_CCMP:
 174                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 175                         return -EINVAL;
 176                 break;
 177         case WLAN_CIPHER_SUITE_WEP104:
 178                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 179                         return -EINVAL;
 180                 break;
 181         case WLAN_CIPHER_SUITE_AES_CMAC:
 182                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 183                         return -EINVAL;
 184                 break;
 185         default:
 186                 return -EINVAL;
 187         }
 188
 189         if (params->seq) {
 190                 switch (params->cipher) {
 191                 case WLAN_CIPHER_SUITE_WEP40:
 192                 case WLAN_CIPHER_SUITE_WEP104:
 193                         /* These ciphers do not use key sequence */
 194                         return -EINVAL;
 195                 case WLAN_CIPHER_SUITE_TKIP:
 196                 case WLAN_CIPHER_SUITE_CCMP:
 197                 case WLAN_CIPHER_SUITE_AES_CMAC:
 198                         if (params->seq_len != 6)
 199                                 return -EINVAL;
 200                         break;
 201                 }
 202         }
 203
 204         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
 205                 if (params->cipher == rdev->wiphy.cipher_suites[i])
 206                         break;
 207         if (i == rdev->wiphy.n_cipher_suites)
 208                 return -EINVAL;
 209
 210         return 0;
 211 }
 212
 213 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
 214 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
 215 const unsigned char rfc1042_header[] __aligned(2) =
 216         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 217 EXPORT_SYMBOL(rfc1042_header);
 218
 219 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 220 const unsigned char bridge_tunnel_header[] __aligned(2) =
 221         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 222 EXPORT_SYMBOL(bridge_tunnel_header);
 223
 224 unsigned int ieee80211_hdrlen(__le16 fc)
 225 {
 226         unsigned int hdrlen = 24;
 227
 228         if (ieee80211_is_data(fc)) {
 229                 if (ieee80211_has_a4(fc))
 230                         hdrlen = 30;
 231                 if (ieee80211_is_data_qos(fc)) {
 232                         hdrlen += IEEE80211_QOS_CTL_LEN;
 233                         if (ieee80211_has_order(fc))
 234                                 hdrlen += IEEE80211_HT_CTL_LEN;
 235                 }
 236                 goto out;
 237         }
 238
 239         if (ieee80211_is_ctl(fc)) {
 240                 /*
 241                  * ACK and CTS are 10 bytes, all others 16. To see how
 242                  * to get this condition consider
 243                  *   subtype mask:   0b0000000011110000 (0x00F0)
 244                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 245                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 246                  *   bits that matter:         ^^^      (0x00E0)
 247                  *   value of those: 0b0000000011000000 (0x00C0)
 248                  */
 249                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 250                         hdrlen = 10;
 251                 else
 252                         hdrlen = 16;
 253         }
 254 out:
 255         return hdrlen;
 256 }
 257 EXPORT_SYMBOL(ieee80211_hdrlen);
 258
 259 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 260 {
 261         const struct ieee80211_hdr *hdr =
 262                         (const struct ieee80211_hdr *)skb->data;
 263         unsigned int hdrlen;
 264
 265         if (unlikely(skb->len < 10))
 266                 return 0;
 267         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 268         if (unlikely(hdrlen > skb->len))
 269                 return 0;
 270         return hdrlen;
 271 }
 272 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 273
 274 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 275 {
 276         int ae = meshhdr->flags & MESH_FLAGS_AE;
 277         /* 7.1.3.5a.2 */
 278         switch (ae) {
 279         case 0:
 280                 return 6;
 281         case MESH_FLAGS_AE_A4:
 282                 return 12;
 283         case MESH_FLAGS_AE_A5_A6:
 284                 return 18;
 285         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 286                 return 24;
 287         default:
 288                 return 6;
 289         }
 290 }
 291
 292 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 293                            enum nl80211_iftype iftype)
 294 {
 295         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 296         u16 hdrlen, ethertype;
 297         u8 *payload;
 298         u8 dst[ETH_ALEN];
 299         u8 src[ETH_ALEN] __aligned(2);
 300
 301         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 302                 return -1;
 303
 304         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 305
 306         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 307          * header
 308          * IEEE 802.11 address fields:
 309          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 310          *   0     0   DA    SA    BSSID n/a
 311          *   0     1   DA    BSSID SA    n/a
 312          *   1     0   BSSID SA    DA    n/a
 313          *   1     1   RA    TA    DA    SA
 314          */
 315         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 316         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 317
 318         switch (hdr->frame_control &
 319                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 320         case cpu_to_le16(IEEE80211_FCTL_TODS):
 321                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 322                              iftype != NL80211_IFTYPE_AP_VLAN))
 323                         return -1;
 324                 break;
 325         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 326                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 327                              iftype != NL80211_IFTYPE_MESH_POINT &&
 328                              iftype != NL80211_IFTYPE_AP_VLAN &&
 329                              iftype != NL80211_IFTYPE_STATION))
 330                         return -1;
 331                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 332                         struct ieee80211s_hdr *meshdr =
 333                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 334                         /* make sure meshdr->flags is on the linear part */
 335                         if (!pskb_may_pull(skb, hdrlen + 1))
 336                                 return -1;
 337                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 338                                 skb_copy_bits(skb, hdrlen +
 339                                         offsetof(struct ieee80211s_hdr, eaddr1),
 340                                         dst, ETH_ALEN);
 341                                 skb_copy_bits(skb, hdrlen +
 342                                         offsetof(struct ieee80211s_hdr, eaddr2),
 343                                         src, ETH_ALEN);
 344                         }
 345                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 346                 }
 347                 break;
 348         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 349                 if ((iftype != NL80211_IFTYPE_STATION &&
 350                     iftype != NL80211_IFTYPE_MESH_POINT) ||
 351                     (is_multicast_ether_addr(dst) &&
 352                      !compare_ether_addr(src, addr)))
 353                         return -1;
 354                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 355                         struct ieee80211s_hdr *meshdr =
 356                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 357                         /* make sure meshdr->flags is on the linear part */
 358                         if (!pskb_may_pull(skb, hdrlen + 1))
 359                                 return -1;
 360                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 361                                 skb_copy_bits(skb, hdrlen +
 362                                         offsetof(struct ieee80211s_hdr, eaddr1),
 363                                         src, ETH_ALEN);
 364                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 365                 }
 366                 break;
 367         case cpu_to_le16(0):
 368                 if (iftype != NL80211_IFTYPE_ADHOC)
 369                         return -1;
 370                 break;
 371         }
 372
 373         if (!pskb_may_pull(skb, hdrlen + 8))
 374                 return -1;
 375
 376         payload = skb->data + hdrlen;
 377         ethertype = (payload[6] << 8) | payload[7];
 378
 379         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 380                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 381                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 382                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 383                  * replace EtherType */
 384                 skb_pull(skb, hdrlen + 6);
 385                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 386                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 387         } else {
 388                 struct ethhdr *ehdr;
 389                 __be16 len;
 390
 391                 skb_pull(skb, hdrlen);
 392                 len = htons(skb->len);
 393                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 394                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 395                 memcpy(ehdr->h_source, src, ETH_ALEN);
 396                 ehdr->h_proto = len;
 397         }
 398         return 0;
 399 }
 400 EXPORT_SYMBOL(ieee80211_data_to_8023);
 401
 402 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 403                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 404 {
 405         struct ieee80211_hdr hdr;
 406         u16 hdrlen, ethertype;
 407         __le16 fc;
 408         const u8 *encaps_data;
 409         int encaps_len, skip_header_bytes;
 410         int nh_pos, h_pos;
 411         int head_need;
 412
 413         if (unlikely(skb->len < ETH_HLEN))
 414                 return -EINVAL;
 415
 416         nh_pos = skb_network_header(skb) - skb->data;
 417         h_pos = skb_transport_header(skb) - skb->data;
 418
 419         /* convert Ethernet header to proper 802.11 header (based on
 420          * operation mode) */
 421         ethertype = (skb->data[12] << 8) | skb->data[13];
 422         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 423
 424         switch (iftype) {
 425         case NL80211_IFTYPE_AP:
 426         case NL80211_IFTYPE_AP_VLAN:
 427                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 428                 /* DA BSSID SA */
 429                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 430                 memcpy(hdr.addr2, addr, ETH_ALEN);
 431                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 432                 hdrlen = 24;
 433                 break;
 434         case NL80211_IFTYPE_STATION:
 435                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 436                 /* BSSID SA DA */
 437                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 438                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 439                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 440                 hdrlen = 24;
 441                 break;
 442         case NL80211_IFTYPE_ADHOC:
 443                 /* DA SA BSSID */
 444                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 445                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 446                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 447                 hdrlen = 24;
 448                 break;
 449         default:
 450                 return -EOPNOTSUPP;
 451         }
 452
 453         if (qos) {
 454                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 455                 hdrlen += 2;
 456         }
 457
 458         hdr.frame_control = fc;
 459         hdr.duration_id = 0;
 460         hdr.seq_ctrl = 0;
 461
 462         skip_header_bytes = ETH_HLEN;
 463         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 464                 encaps_data = bridge_tunnel_header;
 465                 encaps_len = sizeof(bridge_tunnel_header);
 466                 skip_header_bytes -= 2;
 467         } else if (ethertype > 0x600) {
 468                 encaps_data = rfc1042_header;
 469                 encaps_len = sizeof(rfc1042_header);
 470                 skip_header_bytes -= 2;
 471         } else {
 472                 encaps_data = NULL;
 473                 encaps_len = 0;
 474         }
 475
 476         skb_pull(skb, skip_header_bytes);
 477         nh_pos -= skip_header_bytes;
 478         h_pos -= skip_header_bytes;
 479
 480         head_need = hdrlen + encaps_len - skb_headroom(skb);
 481
 482         if (head_need > 0 || skb_cloned(skb)) {
 483                 head_need = max(head_need, 0);
 484                 if (head_need)
 485                         skb_orphan(skb);
 486
 487                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
 488                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
 489                         return -ENOMEM;
 490                 }
 491                 skb->truesize += head_need;
 492         }
 493
 494         if (encaps_data) {
 495                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 496                 nh_pos += encaps_len;
 497                 h_pos += encaps_len;
 498         }
 499
 500         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 501
 502         nh_pos += hdrlen;
 503         h_pos += hdrlen;
 504
 505         /* Update skb pointers to various headers since this modified frame
 506          * is going to go through Linux networking code that may potentially
 507          * need things like pointer to IP header. */
 508         skb_set_mac_header(skb, 0);
 509         skb_set_network_header(skb, nh_pos);
 510         skb_set_transport_header(skb, h_pos);
 511
 512         return 0;
 513 }
 514 EXPORT_SYMBOL(ieee80211_data_from_8023);
 515
 516
 517 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 518                               const u8 *addr, enum nl80211_iftype iftype,
 519                               const unsigned int extra_headroom)
 520 {
 521         struct sk_buff *frame = NULL;
 522         u16 ethertype;
 523         u8 *payload;
 524         const struct ethhdr *eth;
 525         int remaining, err;
 526         u8 dst[ETH_ALEN], src[ETH_ALEN];
 527
 528         err = ieee80211_data_to_8023(skb, addr, iftype);
 529         if (err)
 530                 goto out;
 531
 532         /* skip the wrapping header */
 533         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 534         if (!eth)
 535                 goto out;
 536
 537         while (skb != frame) {
 538                 u8 padding;
 539                 __be16 len = eth->h_proto;
 540                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 541
 542                 remaining = skb->len;
 543                 memcpy(dst, eth->h_dest, ETH_ALEN);
 544                 memcpy(src, eth->h_source, ETH_ALEN);
 545
 546                 padding = (4 - subframe_len) & 0x3;
 547                 /* the last MSDU has no padding */
 548                 if (subframe_len > remaining)
 549                         goto purge;
 550
 551                 skb_pull(skb, sizeof(struct ethhdr));
 552                 /* reuse skb for the last subframe */
 553                 if (remaining <= subframe_len + padding)
 554                         frame = skb;
 555                 else {
 556                         unsigned int hlen = ALIGN(extra_headroom, 4);
 557                         /*
 558                          * Allocate and reserve two bytes more for payload
 559                          * alignment since sizeof(struct ethhdr) is 14.
 560                          */
 561                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 562                         if (!frame)
 563                                 goto purge;
 564
 565                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 566                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 567                                 ntohs(len));
 568
 569                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 570                                                         padding);
 571                         if (!eth) {
 572                                 dev_kfree_skb(frame);
 573                                 goto purge;
 574                         }
 575                 }
 576
 577                 skb_reset_network_header(frame);
 578                 frame->dev = skb->dev;
 579                 frame->priority = skb->priority;
 580
 581                 payload = frame->data;
 582                 ethertype = (payload[6] << 8) | payload[7];
 583
 584                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 585                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 586                            compare_ether_addr(payload,
 587                                               bridge_tunnel_header) == 0)) {
 588                         /* remove RFC1042 or Bridge-Tunnel
 589                          * encapsulation and replace EtherType */
 590                         skb_pull(frame, 6);
 591                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 592                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 593                 } else {
 594                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 595                                 sizeof(__be16));
 596                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 597                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 598                 }
 599                 __skb_queue_tail(list, frame);
 600         }
 601
 602         return;
 603
 604  purge:
 605         __skb_queue_purge(list);
 606  out:
 607         dev_kfree_skb(skb);
 608 }
 609 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 610
 611 /* Given a data frame determine the 802.1p/1d tag to use. */
 612 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 613 {
 614         unsigned int dscp;
 615
 616         /* skb->priority values from 256->263 are magic values to
 617          * directly indicate a specific 802.1d priority.  This is used
 618          * to allow 802.1d priority to be passed directly in from VLAN
 619          * tags, etc.
 620          */
 621         if (skb->priority >= 256 && skb->priority <= 263)
 622                 return skb->priority - 256;
 623
 624         switch (skb->protocol) {
 625         case htons(ETH_P_IP):
 626                 dscp = ip_hdr(skb)->tos & 0xfc;
 627                 break;
 628         default:
 629                 return 0;
 630         }
 631
 632         return dscp >> 5;
 633 }
 634 EXPORT_SYMBOL(cfg80211_classify8021d);
 635
 636 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 637 {
 638         u8 *end, *pos;
 639
 640         pos = bss->information_elements;
 641         if (pos == NULL)
 642                 return NULL;
 643         end = pos + bss->len_information_elements;
 644
 645         while (pos + 1 < end) {
 646                 if (pos + 2 + pos[1] > end)
 647                         break;
 648                 if (pos[0] == ie)
 649                         return pos;
 650                 pos += 2 + pos[1];
 651         }
 652
 653         return NULL;
 654 }
 655 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 656
 657 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 658 {
 659         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 660         struct net_device *dev = wdev->netdev;
 661         int i;
 662
 663         if (!wdev->connect_keys)
 664                 return;
 665
 666         for (i = 0; i < 6; i++) {
 667                 if (!wdev->connect_keys->params[i].cipher)
 668                         continue;
 669                 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
 670                                         &wdev->connect_keys->params[i])) {
 671                         printk(KERN_ERR "%s: failed to set key %d\n",
 672                                 dev->name, i);
 673                         continue;
 674                 }
 675                 if (wdev->connect_keys->def == i)
 676                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
 677                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
 678                                         dev->name, i);
 679                                 continue;
 680                         }
 681                 if (wdev->connect_keys->defmgmt == i)
 682                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 683                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
 684                                         dev->name, i);
 685         }
 686
 687         kfree(wdev->connect_keys);
 688         wdev->connect_keys = NULL;
 689 }
 690
 691 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 692 {
 693         struct cfg80211_event *ev;
 694         unsigned long flags;
 695         const u8 *bssid = NULL;
 696
 697         spin_lock_irqsave(&wdev->event_lock, flags);
 698         while (!list_empty(&wdev->event_list)) {
 699                 ev = list_first_entry(&wdev->event_list,
 700                                       struct cfg80211_event, list);
 701                 list_del(&ev->list);
 702                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 703
 704                 wdev_lock(wdev);
 705                 switch (ev->type) {
 706                 case EVENT_CONNECT_RESULT:
 707                         if (!is_zero_ether_addr(ev->cr.bssid))
 708                                 bssid = ev->cr.bssid;
 709                         __cfg80211_connect_result(
 710                                 wdev->netdev, bssid,
 711                                 ev->cr.req_ie, ev->cr.req_ie_len,
 712                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 713                                 ev->cr.status,
 714                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 715                                 NULL);
 716                         break;
 717                 case EVENT_ROAMED:
 718                         __cfg80211_roamed(wdev, ev->rm.bssid,
 719                                           ev->rm.req_ie, ev->rm.req_ie_len,
 720                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 721                         break;
 722                 case EVENT_DISCONNECTED:
 723                         __cfg80211_disconnected(wdev->netdev,
 724                                                 ev->dc.ie, ev->dc.ie_len,
 725                                                 ev->dc.reason, true);
 726                         break;
 727                 case EVENT_IBSS_JOINED:
 728                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 729                         break;
 730                 }
 731                 wdev_unlock(wdev);
 732
 733                 kfree(ev);
 734
 735                 spin_lock_irqsave(&wdev->event_lock, flags);
 736         }
 737         spin_unlock_irqrestore(&wdev->event_lock, flags);
 738 }
 739
 740 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 741 {
 742         struct wireless_dev *wdev;
 743
 744         ASSERT_RTNL();
 745         ASSERT_RDEV_LOCK(rdev);
 746
 747         mutex_lock(&rdev->devlist_mtx);
 748
 749         list_for_each_entry(wdev, &rdev->netdev_list, list)
 750                 cfg80211_process_wdev_events(wdev);
 751
 752         mutex_unlock(&rdev->devlist_mtx);
 753 }
 754
 755 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 756                           struct net_device *dev, enum nl80211_iftype ntype,
 757                           u32 *flags, struct vif_params *params)
 758 {
 759         int err;
 760         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 761
 762         ASSERT_RDEV_LOCK(rdev);
 763
 764         /* don't support changing VLANs, you just re-create them */
 765         if (otype == NL80211_IFTYPE_AP_VLAN)
 766                 return -EOPNOTSUPP;
 767
 768         if (!rdev->ops->change_virtual_intf ||
 769             !(rdev->wiphy.interface_modes & (1 << ntype)))
 770                 return -EOPNOTSUPP;
 771
 772         /* if it's part of a bridge, reject changing type to station/ibss */
 773         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 774             (ntype == NL80211_IFTYPE_ADHOC || ntype == NL80211_IFTYPE_STATION))
 775                 return -EBUSY;
 776
 777         if (ntype != otype) {
 778                 dev->ieee80211_ptr->use_4addr = false;
 779
 780                 switch (otype) {
 781                 case NL80211_IFTYPE_ADHOC:
 782                         cfg80211_leave_ibss(rdev, dev, false);
 783                         break;
 784                 case NL80211_IFTYPE_STATION:
 785                         cfg80211_disconnect(rdev, dev,
 786                                             WLAN_REASON_DEAUTH_LEAVING, true);
 787                         break;
 788                 case NL80211_IFTYPE_MESH_POINT:
 789                         /* mesh should be handled? */
 790                         break;
 791                 default:
 792                         break;
 793                 }
 794
 795                 cfg80211_process_rdev_events(rdev);
 796         }
 797
 798         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 799                                              ntype, flags, params);
 800
 801         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 802
 803         if (!err && params && params->use_4addr != -1)
 804                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 805
 806         if (!err) {
 807                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 808                 switch (ntype) {
 809                 case NL80211_IFTYPE_STATION:
 810                         if (dev->ieee80211_ptr->use_4addr)
 811                                 break;
 812                         /* fall through */
 813                 case NL80211_IFTYPE_ADHOC:
 814                         dev->priv_flags |= IFF_DONT_BRIDGE;
 815                         break;
 816                 case NL80211_IFTYPE_AP:
 817                 case NL80211_IFTYPE_AP_VLAN:
 818                 case NL80211_IFTYPE_WDS:
 819                 case NL80211_IFTYPE_MESH_POINT:
 820                         /* bridging OK */
 821                         break;
 822                 case NL80211_IFTYPE_MONITOR:
 823                         /* monitor can't bridge anyway */
 824                         break;
 825                 case NL80211_IFTYPE_UNSPECIFIED:
 826                 case __NL80211_IFTYPE_AFTER_LAST:
 827                         /* not happening */
 828                         break;
 829                 }
 830         }
 831
 832         return err;
 833 }
 834
 835 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
 836 {
 837         int modulation, streams, bitrate;
 838
 839         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 840                 return rate->legacy;
 841
 842         /* the formula below does only work for MCS values smaller than 32 */
 843         if (rate->mcs >= 32)
 844                 return 0;
 845
 846         modulation = rate->mcs & 7;
 847         streams = (rate->mcs >> 3) + 1;
 848
 849         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 850                         13500000 : 6500000;
 851
 852         if (modulation < 4)
 853                 bitrate *= (modulation + 1);
 854         else if (modulation == 4)
 855                 bitrate *= (modulation + 2);
 856         else
 857                 bitrate *= (modulation + 3);
 858
 859         bitrate *= streams;
 860
 861         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 862                 bitrate = (bitrate / 9) * 10;
 863
 864         /* do NOT round down here */
 865         return (bitrate + 50000) / 100000;
 866 }