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