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                 /*
 187                  * We don't know anything about this algorithm,
 188                  * allow using it -- but the driver must check
 189                  * all parameters! We still check below whether
 190                  * or not the driver supports this algorithm,
 191                  * of course.
 192                  */
 193                 break;
 194         }
 195
 196         if (params->seq) {
 197                 switch (params->cipher) {
 198                 case WLAN_CIPHER_SUITE_WEP40:
 199                 case WLAN_CIPHER_SUITE_WEP104:
 200                         /* These ciphers do not use key sequence */
 201                         return -EINVAL;
 202                 case WLAN_CIPHER_SUITE_TKIP:
 203                 case WLAN_CIPHER_SUITE_CCMP:
 204                 case WLAN_CIPHER_SUITE_AES_CMAC:
 205                         if (params->seq_len != 6)
 206                                 return -EINVAL;
 207                         break;
 208                 }
 209         }
 210
 211         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
 212                 if (params->cipher == rdev->wiphy.cipher_suites[i])
 213                         break;
 214         if (i == rdev->wiphy.n_cipher_suites)
 215                 return -EINVAL;
 216
 217         return 0;
 218 }
 219
 220 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
 221 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
 222 const unsigned char rfc1042_header[] __aligned(2) =
 223         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 224 EXPORT_SYMBOL(rfc1042_header);
 225
 226 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 227 const unsigned char bridge_tunnel_header[] __aligned(2) =
 228         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 229 EXPORT_SYMBOL(bridge_tunnel_header);
 230
 231 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 232 {
 233         unsigned int hdrlen = 24;
 234
 235         if (ieee80211_is_data(fc)) {
 236                 if (ieee80211_has_a4(fc))
 237                         hdrlen = 30;
 238                 if (ieee80211_is_data_qos(fc)) {
 239                         hdrlen += IEEE80211_QOS_CTL_LEN;
 240                         if (ieee80211_has_order(fc))
 241                                 hdrlen += IEEE80211_HT_CTL_LEN;
 242                 }
 243                 goto out;
 244         }
 245
 246         if (ieee80211_is_ctl(fc)) {
 247                 /*
 248                  * ACK and CTS are 10 bytes, all others 16. To see how
 249                  * to get this condition consider
 250                  *   subtype mask:   0b0000000011110000 (0x00F0)
 251                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 252                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 253                  *   bits that matter:         ^^^      (0x00E0)
 254                  *   value of those: 0b0000000011000000 (0x00C0)
 255                  */
 256                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 257                         hdrlen = 10;
 258                 else
 259                         hdrlen = 16;
 260         }
 261 out:
 262         return hdrlen;
 263 }
 264 EXPORT_SYMBOL(ieee80211_hdrlen);
 265
 266 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 267 {
 268         const struct ieee80211_hdr *hdr =
 269                         (const struct ieee80211_hdr *)skb->data;
 270         unsigned int hdrlen;
 271
 272         if (unlikely(skb->len < 10))
 273                 return 0;
 274         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 275         if (unlikely(hdrlen > skb->len))
 276                 return 0;
 277         return hdrlen;
 278 }
 279 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 280
 281 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 282 {
 283         int ae = meshhdr->flags & MESH_FLAGS_AE;
 284         /* 7.1.3.5a.2 */
 285         switch (ae) {
 286         case 0:
 287                 return 6;
 288         case MESH_FLAGS_AE_A4:
 289                 return 12;
 290         case MESH_FLAGS_AE_A5_A6:
 291                 return 18;
 292         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 293                 return 24;
 294         default:
 295                 return 6;
 296         }
 297 }
 298
 299 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 300                            enum nl80211_iftype iftype)
 301 {
 302         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 303         u16 hdrlen, ethertype;
 304         u8 *payload;
 305         u8 dst[ETH_ALEN];
 306         u8 src[ETH_ALEN] __aligned(2);
 307
 308         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 309                 return -1;
 310
 311         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 312
 313         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 314          * header
 315          * IEEE 802.11 address fields:
 316          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 317          *   0     0   DA    SA    BSSID n/a
 318          *   0     1   DA    BSSID SA    n/a
 319          *   1     0   BSSID SA    DA    n/a
 320          *   1     1   RA    TA    DA    SA
 321          */
 322         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 323         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 324
 325         switch (hdr->frame_control &
 326                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 327         case cpu_to_le16(IEEE80211_FCTL_TODS):
 328                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 329                              iftype != NL80211_IFTYPE_AP_VLAN))
 330                         return -1;
 331                 break;
 332         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 333                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 334                              iftype != NL80211_IFTYPE_MESH_POINT &&
 335                              iftype != NL80211_IFTYPE_AP_VLAN &&
 336                              iftype != NL80211_IFTYPE_STATION))
 337                         return -1;
 338                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 339                         struct ieee80211s_hdr *meshdr =
 340                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 341                         /* make sure meshdr->flags is on the linear part */
 342                         if (!pskb_may_pull(skb, hdrlen + 1))
 343                                 return -1;
 344                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 345                                 skb_copy_bits(skb, hdrlen +
 346                                         offsetof(struct ieee80211s_hdr, eaddr1),
 347                                         dst, ETH_ALEN);
 348                                 skb_copy_bits(skb, hdrlen +
 349                                         offsetof(struct ieee80211s_hdr, eaddr2),
 350                                         src, ETH_ALEN);
 351                         }
 352                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 353                 }
 354                 break;
 355         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 356                 if ((iftype != NL80211_IFTYPE_STATION &&
 357                     iftype != NL80211_IFTYPE_MESH_POINT) ||
 358                     (is_multicast_ether_addr(dst) &&
 359                      !compare_ether_addr(src, addr)))
 360                         return -1;
 361                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 362                         struct ieee80211s_hdr *meshdr =
 363                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 364                         /* make sure meshdr->flags is on the linear part */
 365                         if (!pskb_may_pull(skb, hdrlen + 1))
 366                                 return -1;
 367                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 368                                 skb_copy_bits(skb, hdrlen +
 369                                         offsetof(struct ieee80211s_hdr, eaddr1),
 370                                         src, ETH_ALEN);
 371                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 372                 }
 373                 break;
 374         case cpu_to_le16(0):
 375                 if (iftype != NL80211_IFTYPE_ADHOC)
 376                         return -1;
 377                 break;
 378         }
 379
 380         if (!pskb_may_pull(skb, hdrlen + 8))
 381                 return -1;
 382
 383         payload = skb->data + hdrlen;
 384         ethertype = (payload[6] << 8) | payload[7];
 385
 386         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 387                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 388                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 389                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 390                  * replace EtherType */
 391                 skb_pull(skb, hdrlen + 6);
 392                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 393                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 394         } else {
 395                 struct ethhdr *ehdr;
 396                 __be16 len;
 397
 398                 skb_pull(skb, hdrlen);
 399                 len = htons(skb->len);
 400                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 401                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 402                 memcpy(ehdr->h_source, src, ETH_ALEN);
 403                 ehdr->h_proto = len;
 404         }
 405         return 0;
 406 }
 407 EXPORT_SYMBOL(ieee80211_data_to_8023);
 408
 409 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 410                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 411 {
 412         struct ieee80211_hdr hdr;
 413         u16 hdrlen, ethertype;
 414         __le16 fc;
 415         const u8 *encaps_data;
 416         int encaps_len, skip_header_bytes;
 417         int nh_pos, h_pos;
 418         int head_need;
 419
 420         if (unlikely(skb->len < ETH_HLEN))
 421                 return -EINVAL;
 422
 423         nh_pos = skb_network_header(skb) - skb->data;
 424         h_pos = skb_transport_header(skb) - skb->data;
 425
 426         /* convert Ethernet header to proper 802.11 header (based on
 427          * operation mode) */
 428         ethertype = (skb->data[12] << 8) | skb->data[13];
 429         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 430
 431         switch (iftype) {
 432         case NL80211_IFTYPE_AP:
 433         case NL80211_IFTYPE_AP_VLAN:
 434                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 435                 /* DA BSSID SA */
 436                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 437                 memcpy(hdr.addr2, addr, ETH_ALEN);
 438                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 439                 hdrlen = 24;
 440                 break;
 441         case NL80211_IFTYPE_STATION:
 442                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 443                 /* BSSID SA DA */
 444                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 445                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 446                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 447                 hdrlen = 24;
 448                 break;
 449         case NL80211_IFTYPE_ADHOC:
 450                 /* DA SA BSSID */
 451                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 452                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 453                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 454                 hdrlen = 24;
 455                 break;
 456         default:
 457                 return -EOPNOTSUPP;
 458         }
 459
 460         if (qos) {
 461                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 462                 hdrlen += 2;
 463         }
 464
 465         hdr.frame_control = fc;
 466         hdr.duration_id = 0;
 467         hdr.seq_ctrl = 0;
 468
 469         skip_header_bytes = ETH_HLEN;
 470         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 471                 encaps_data = bridge_tunnel_header;
 472                 encaps_len = sizeof(bridge_tunnel_header);
 473                 skip_header_bytes -= 2;
 474         } else if (ethertype > 0x600) {
 475                 encaps_data = rfc1042_header;
 476                 encaps_len = sizeof(rfc1042_header);
 477                 skip_header_bytes -= 2;
 478         } else {
 479                 encaps_data = NULL;
 480                 encaps_len = 0;
 481         }
 482
 483         skb_pull(skb, skip_header_bytes);
 484         nh_pos -= skip_header_bytes;
 485         h_pos -= skip_header_bytes;
 486
 487         head_need = hdrlen + encaps_len - skb_headroom(skb);
 488
 489         if (head_need > 0 || skb_cloned(skb)) {
 490                 head_need = max(head_need, 0);
 491                 if (head_need)
 492                         skb_orphan(skb);
 493
 494                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
 495                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
 496                         return -ENOMEM;
 497                 }
 498                 skb->truesize += head_need;
 499         }
 500
 501         if (encaps_data) {
 502                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 503                 nh_pos += encaps_len;
 504                 h_pos += encaps_len;
 505         }
 506
 507         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 508
 509         nh_pos += hdrlen;
 510         h_pos += hdrlen;
 511
 512         /* Update skb pointers to various headers since this modified frame
 513          * is going to go through Linux networking code that may potentially
 514          * need things like pointer to IP header. */
 515         skb_set_mac_header(skb, 0);
 516         skb_set_network_header(skb, nh_pos);
 517         skb_set_transport_header(skb, h_pos);
 518
 519         return 0;
 520 }
 521 EXPORT_SYMBOL(ieee80211_data_from_8023);
 522
 523
 524 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 525                               const u8 *addr, enum nl80211_iftype iftype,
 526                               const unsigned int extra_headroom)
 527 {
 528         struct sk_buff *frame = NULL;
 529         u16 ethertype;
 530         u8 *payload;
 531         const struct ethhdr *eth;
 532         int remaining, err;
 533         u8 dst[ETH_ALEN], src[ETH_ALEN];
 534
 535         err = ieee80211_data_to_8023(skb, addr, iftype);
 536         if (err)
 537                 goto out;
 538
 539         /* skip the wrapping header */
 540         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 541         if (!eth)
 542                 goto out;
 543
 544         while (skb != frame) {
 545                 u8 padding;
 546                 __be16 len = eth->h_proto;
 547                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 548
 549                 remaining = skb->len;
 550                 memcpy(dst, eth->h_dest, ETH_ALEN);
 551                 memcpy(src, eth->h_source, ETH_ALEN);
 552
 553                 padding = (4 - subframe_len) & 0x3;
 554                 /* the last MSDU has no padding */
 555                 if (subframe_len > remaining)
 556                         goto purge;
 557
 558                 skb_pull(skb, sizeof(struct ethhdr));
 559                 /* reuse skb for the last subframe */
 560                 if (remaining <= subframe_len + padding)
 561                         frame = skb;
 562                 else {
 563                         unsigned int hlen = ALIGN(extra_headroom, 4);
 564                         /*
 565                          * Allocate and reserve two bytes more for payload
 566                          * alignment since sizeof(struct ethhdr) is 14.
 567                          */
 568                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 569                         if (!frame)
 570                                 goto purge;
 571
 572                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 573                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 574                                 ntohs(len));
 575
 576                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 577                                                         padding);
 578                         if (!eth) {
 579                                 dev_kfree_skb(frame);
 580                                 goto purge;
 581                         }
 582                 }
 583
 584                 skb_reset_network_header(frame);
 585                 frame->dev = skb->dev;
 586                 frame->priority = skb->priority;
 587
 588                 payload = frame->data;
 589                 ethertype = (payload[6] << 8) | payload[7];
 590
 591                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 592                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 593                            compare_ether_addr(payload,
 594                                               bridge_tunnel_header) == 0)) {
 595                         /* remove RFC1042 or Bridge-Tunnel
 596                          * encapsulation and replace EtherType */
 597                         skb_pull(frame, 6);
 598                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 599                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 600                 } else {
 601                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 602                                 sizeof(__be16));
 603                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 604                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 605                 }
 606                 __skb_queue_tail(list, frame);
 607         }
 608
 609         return;
 610
 611  purge:
 612         __skb_queue_purge(list);
 613  out:
 614         dev_kfree_skb(skb);
 615 }
 616 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 617
 618 /* Given a data frame determine the 802.1p/1d tag to use. */
 619 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 620 {
 621         unsigned int dscp;
 622
 623         /* skb->priority values from 256->263 are magic values to
 624          * directly indicate a specific 802.1d priority.  This is used
 625          * to allow 802.1d priority to be passed directly in from VLAN
 626          * tags, etc.
 627          */
 628         if (skb->priority >= 256 && skb->priority <= 263)
 629                 return skb->priority - 256;
 630
 631         switch (skb->protocol) {
 632         case htons(ETH_P_IP):
 633                 dscp = ip_hdr(skb)->tos & 0xfc;
 634                 break;
 635         default:
 636                 return 0;
 637         }
 638
 639         return dscp >> 5;
 640 }
 641 EXPORT_SYMBOL(cfg80211_classify8021d);
 642
 643 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 644 {
 645         u8 *end, *pos;
 646
 647         pos = bss->information_elements;
 648         if (pos == NULL)
 649                 return NULL;
 650         end = pos + bss->len_information_elements;
 651
 652         while (pos + 1 < end) {
 653                 if (pos + 2 + pos[1] > end)
 654                         break;
 655                 if (pos[0] == ie)
 656                         return pos;
 657                 pos += 2 + pos[1];
 658         }
 659
 660         return NULL;
 661 }
 662 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 663
 664 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 665 {
 666         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 667         struct net_device *dev = wdev->netdev;
 668         int i;
 669
 670         if (!wdev->connect_keys)
 671                 return;
 672
 673         for (i = 0; i < 6; i++) {
 674                 if (!wdev->connect_keys->params[i].cipher)
 675                         continue;
 676                 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
 677                                         &wdev->connect_keys->params[i])) {
 678                         printk(KERN_ERR "%s: failed to set key %d\n",
 679                                 dev->name, i);
 680                         continue;
 681                 }
 682                 if (wdev->connect_keys->def == i)
 683                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
 684                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
 685                                         dev->name, i);
 686                                 continue;
 687                         }
 688                 if (wdev->connect_keys->defmgmt == i)
 689                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 690                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
 691                                         dev->name, i);
 692         }
 693
 694         kfree(wdev->connect_keys);
 695         wdev->connect_keys = NULL;
 696 }
 697
 698 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 699 {
 700         struct cfg80211_event *ev;
 701         unsigned long flags;
 702         const u8 *bssid = NULL;
 703
 704         spin_lock_irqsave(&wdev->event_lock, flags);
 705         while (!list_empty(&wdev->event_list)) {
 706                 ev = list_first_entry(&wdev->event_list,
 707                                       struct cfg80211_event, list);
 708                 list_del(&ev->list);
 709                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 710
 711                 wdev_lock(wdev);
 712                 switch (ev->type) {
 713                 case EVENT_CONNECT_RESULT:
 714                         if (!is_zero_ether_addr(ev->cr.bssid))
 715                                 bssid = ev->cr.bssid;
 716                         __cfg80211_connect_result(
 717                                 wdev->netdev, bssid,
 718                                 ev->cr.req_ie, ev->cr.req_ie_len,
 719                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 720                                 ev->cr.status,
 721                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 722                                 NULL);
 723                         break;
 724                 case EVENT_ROAMED:
 725                         __cfg80211_roamed(wdev, ev->rm.bssid,
 726                                           ev->rm.req_ie, ev->rm.req_ie_len,
 727                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 728                         break;
 729                 case EVENT_DISCONNECTED:
 730                         __cfg80211_disconnected(wdev->netdev,
 731                                                 ev->dc.ie, ev->dc.ie_len,
 732                                                 ev->dc.reason, true);
 733                         break;
 734                 case EVENT_IBSS_JOINED:
 735                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 736                         break;
 737                 }
 738                 wdev_unlock(wdev);
 739
 740                 kfree(ev);
 741
 742                 spin_lock_irqsave(&wdev->event_lock, flags);
 743         }
 744         spin_unlock_irqrestore(&wdev->event_lock, flags);
 745 }
 746
 747 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 748 {
 749         struct wireless_dev *wdev;
 750
 751         ASSERT_RTNL();
 752         ASSERT_RDEV_LOCK(rdev);
 753
 754         mutex_lock(&rdev->devlist_mtx);
 755
 756         list_for_each_entry(wdev, &rdev->netdev_list, list)
 757                 cfg80211_process_wdev_events(wdev);
 758
 759         mutex_unlock(&rdev->devlist_mtx);
 760 }
 761
 762 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 763                           struct net_device *dev, enum nl80211_iftype ntype,
 764                           u32 *flags, struct vif_params *params)
 765 {
 766         int err;
 767         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 768
 769         ASSERT_RDEV_LOCK(rdev);
 770
 771         /* don't support changing VLANs, you just re-create them */
 772         if (otype == NL80211_IFTYPE_AP_VLAN)
 773                 return -EOPNOTSUPP;
 774
 775         if (!rdev->ops->change_virtual_intf ||
 776             !(rdev->wiphy.interface_modes & (1 << ntype)))
 777                 return -EOPNOTSUPP;
 778
 779         /* if it's part of a bridge, reject changing type to station/ibss */
 780         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 781             (ntype == NL80211_IFTYPE_ADHOC || ntype == NL80211_IFTYPE_STATION))
 782                 return -EBUSY;
 783
 784         if (ntype != otype) {
 785                 dev->ieee80211_ptr->use_4addr = false;
 786
 787                 switch (otype) {
 788                 case NL80211_IFTYPE_ADHOC:
 789                         cfg80211_leave_ibss(rdev, dev, false);
 790                         break;
 791                 case NL80211_IFTYPE_STATION:
 792                         cfg80211_disconnect(rdev, dev,
 793                                             WLAN_REASON_DEAUTH_LEAVING, true);
 794                         break;
 795                 case NL80211_IFTYPE_MESH_POINT:
 796                         /* mesh should be handled? */
 797                         break;
 798                 default:
 799                         break;
 800                 }
 801
 802                 cfg80211_process_rdev_events(rdev);
 803         }
 804
 805         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 806                                              ntype, flags, params);
 807
 808         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 809
 810         if (!err && params && params->use_4addr != -1)
 811                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 812
 813         if (!err) {
 814                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 815                 switch (ntype) {
 816                 case NL80211_IFTYPE_STATION:
 817                         if (dev->ieee80211_ptr->use_4addr)
 818                                 break;
 819                         /* fall through */
 820                 case NL80211_IFTYPE_ADHOC:
 821                         dev->priv_flags |= IFF_DONT_BRIDGE;
 822                         break;
 823                 case NL80211_IFTYPE_AP:
 824                 case NL80211_IFTYPE_AP_VLAN:
 825                 case NL80211_IFTYPE_WDS:
 826                 case NL80211_IFTYPE_MESH_POINT:
 827                         /* bridging OK */
 828                         break;
 829                 case NL80211_IFTYPE_MONITOR:
 830                         /* monitor can't bridge anyway */
 831                         break;
 832                 case NL80211_IFTYPE_UNSPECIFIED:
 833                 case NUM_NL80211_IFTYPES:
 834                         /* not happening */
 835                         break;
 836                 }
 837         }
 838
 839         return err;
 840 }
 841
 842 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
 843 {
 844         int modulation, streams, bitrate;
 845
 846         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 847                 return rate->legacy;
 848
 849         /* the formula below does only work for MCS values smaller than 32 */
 850         if (rate->mcs >= 32)
 851                 return 0;
 852
 853         modulation = rate->mcs & 7;
 854         streams = (rate->mcs >> 3) + 1;
 855
 856         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 857                         13500000 : 6500000;
 858
 859         if (modulation < 4)
 860                 bitrate *= (modulation + 1);
 861         else if (modulation == 4)
 862                 bitrate *= (modulation + 2);
 863         else
 864                 bitrate *= (modulation + 3);
 865
 866         bitrate *= streams;
 867
 868         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 869                 bitrate = (bitrate / 9) * 10;
 870
 871         /* do NOT round down here */
 872         return (bitrate + 50000) / 100000;
 873 }