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                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 335                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 336                                 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
 337                                 memcpy(src, meshdr->eaddr2, ETH_ALEN);
 338                         }
 339                 }
 340                 break;
 341         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 342                 if ((iftype != NL80211_IFTYPE_STATION &&
 343                     iftype != NL80211_IFTYPE_MESH_POINT) ||
 344                     (is_multicast_ether_addr(dst) &&
 345                      !compare_ether_addr(src, addr)))
 346                         return -1;
 347                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 348                         struct ieee80211s_hdr *meshdr =
 349                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 350                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 351                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 352                                 memcpy(src, meshdr->eaddr1, ETH_ALEN);
 353                 }
 354                 break;
 355         case cpu_to_le16(0):
 356                 if (iftype != NL80211_IFTYPE_ADHOC)
 357                         return -1;
 358                 break;
 359         }
 360
 361         if (unlikely(skb->len - hdrlen < 8))
 362                 return -1;
 363
 364         payload = skb->data + hdrlen;
 365         ethertype = (payload[6] << 8) | payload[7];
 366
 367         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 368                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 369                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 370                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 371                  * replace EtherType */
 372                 skb_pull(skb, hdrlen + 6);
 373                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 374                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 375         } else {
 376                 struct ethhdr *ehdr;
 377                 __be16 len;
 378
 379                 skb_pull(skb, hdrlen);
 380                 len = htons(skb->len);
 381                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 382                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 383                 memcpy(ehdr->h_source, src, ETH_ALEN);
 384                 ehdr->h_proto = len;
 385         }
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(ieee80211_data_to_8023);
 389
 390 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 391                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 392 {
 393         struct ieee80211_hdr hdr;
 394         u16 hdrlen, ethertype;
 395         __le16 fc;
 396         const u8 *encaps_data;
 397         int encaps_len, skip_header_bytes;
 398         int nh_pos, h_pos;
 399         int head_need;
 400
 401         if (unlikely(skb->len < ETH_HLEN))
 402                 return -EINVAL;
 403
 404         nh_pos = skb_network_header(skb) - skb->data;
 405         h_pos = skb_transport_header(skb) - skb->data;
 406
 407         /* convert Ethernet header to proper 802.11 header (based on
 408          * operation mode) */
 409         ethertype = (skb->data[12] << 8) | skb->data[13];
 410         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 411
 412         switch (iftype) {
 413         case NL80211_IFTYPE_AP:
 414         case NL80211_IFTYPE_AP_VLAN:
 415                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 416                 /* DA BSSID SA */
 417                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 418                 memcpy(hdr.addr2, addr, ETH_ALEN);
 419                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 420                 hdrlen = 24;
 421                 break;
 422         case NL80211_IFTYPE_STATION:
 423                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 424                 /* BSSID SA DA */
 425                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 426                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 427                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 428                 hdrlen = 24;
 429                 break;
 430         case NL80211_IFTYPE_ADHOC:
 431                 /* DA SA BSSID */
 432                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 433                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 434                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 435                 hdrlen = 24;
 436                 break;
 437         default:
 438                 return -EOPNOTSUPP;
 439         }
 440
 441         if (qos) {
 442                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 443                 hdrlen += 2;
 444         }
 445
 446         hdr.frame_control = fc;
 447         hdr.duration_id = 0;
 448         hdr.seq_ctrl = 0;
 449
 450         skip_header_bytes = ETH_HLEN;
 451         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 452                 encaps_data = bridge_tunnel_header;
 453                 encaps_len = sizeof(bridge_tunnel_header);
 454                 skip_header_bytes -= 2;
 455         } else if (ethertype > 0x600) {
 456                 encaps_data = rfc1042_header;
 457                 encaps_len = sizeof(rfc1042_header);
 458                 skip_header_bytes -= 2;
 459         } else {
 460                 encaps_data = NULL;
 461                 encaps_len = 0;
 462         }
 463
 464         skb_pull(skb, skip_header_bytes);
 465         nh_pos -= skip_header_bytes;
 466         h_pos -= skip_header_bytes;
 467
 468         head_need = hdrlen + encaps_len - skb_headroom(skb);
 469
 470         if (head_need > 0 || skb_cloned(skb)) {
 471                 head_need = max(head_need, 0);
 472                 if (head_need)
 473                         skb_orphan(skb);
 474
 475                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
 476                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
 477                         return -ENOMEM;
 478                 }
 479                 skb->truesize += head_need;
 480         }
 481
 482         if (encaps_data) {
 483                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 484                 nh_pos += encaps_len;
 485                 h_pos += encaps_len;
 486         }
 487
 488         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 489
 490         nh_pos += hdrlen;
 491         h_pos += hdrlen;
 492
 493         /* Update skb pointers to various headers since this modified frame
 494          * is going to go through Linux networking code that may potentially
 495          * need things like pointer to IP header. */
 496         skb_set_mac_header(skb, 0);
 497         skb_set_network_header(skb, nh_pos);
 498         skb_set_transport_header(skb, h_pos);
 499
 500         return 0;
 501 }
 502 EXPORT_SYMBOL(ieee80211_data_from_8023);
 503
 504
 505 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 506                               const u8 *addr, enum nl80211_iftype iftype,
 507                               const unsigned int extra_headroom)
 508 {
 509         struct sk_buff *frame = NULL;
 510         u16 ethertype;
 511         u8 *payload;
 512         const struct ethhdr *eth;
 513         int remaining, err;
 514         u8 dst[ETH_ALEN], src[ETH_ALEN];
 515
 516         err = ieee80211_data_to_8023(skb, addr, iftype);
 517         if (err)
 518                 goto out;
 519
 520         /* skip the wrapping header */
 521         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 522         if (!eth)
 523                 goto out;
 524
 525         while (skb != frame) {
 526                 u8 padding;
 527                 __be16 len = eth->h_proto;
 528                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 529
 530                 remaining = skb->len;
 531                 memcpy(dst, eth->h_dest, ETH_ALEN);
 532                 memcpy(src, eth->h_source, ETH_ALEN);
 533
 534                 padding = (4 - subframe_len) & 0x3;
 535                 /* the last MSDU has no padding */
 536                 if (subframe_len > remaining)
 537                         goto purge;
 538
 539                 skb_pull(skb, sizeof(struct ethhdr));
 540                 /* reuse skb for the last subframe */
 541                 if (remaining <= subframe_len + padding)
 542                         frame = skb;
 543                 else {
 544                         unsigned int hlen = ALIGN(extra_headroom, 4);
 545                         /*
 546                          * Allocate and reserve two bytes more for payload
 547                          * alignment since sizeof(struct ethhdr) is 14.
 548                          */
 549                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 550                         if (!frame)
 551                                 goto purge;
 552
 553                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 554                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 555                                 ntohs(len));
 556
 557                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 558                                                         padding);
 559                         if (!eth) {
 560                                 dev_kfree_skb(frame);
 561                                 goto purge;
 562                         }
 563                 }
 564
 565                 skb_reset_network_header(frame);
 566                 frame->dev = skb->dev;
 567                 frame->priority = skb->priority;
 568
 569                 payload = frame->data;
 570                 ethertype = (payload[6] << 8) | payload[7];
 571
 572                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 573                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 574                            compare_ether_addr(payload,
 575                                               bridge_tunnel_header) == 0)) {
 576                         /* remove RFC1042 or Bridge-Tunnel
 577                          * encapsulation and replace EtherType */
 578                         skb_pull(frame, 6);
 579                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 580                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 581                 } else {
 582                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 583                                 sizeof(__be16));
 584                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 585                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 586                 }
 587                 __skb_queue_tail(list, frame);
 588         }
 589
 590         return;
 591
 592  purge:
 593         __skb_queue_purge(list);
 594  out:
 595         dev_kfree_skb(skb);
 596 }
 597 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 598
 599 /* Given a data frame determine the 802.1p/1d tag to use. */
 600 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 601 {
 602         unsigned int dscp;
 603
 604         /* skb->priority values from 256->263 are magic values to
 605          * directly indicate a specific 802.1d priority.  This is used
 606          * to allow 802.1d priority to be passed directly in from VLAN
 607          * tags, etc.
 608          */
 609         if (skb->priority >= 256 && skb->priority <= 263)
 610                 return skb->priority - 256;
 611
 612         switch (skb->protocol) {
 613         case htons(ETH_P_IP):
 614                 dscp = ip_hdr(skb)->tos & 0xfc;
 615                 break;
 616         default:
 617                 return 0;
 618         }
 619
 620         return dscp >> 5;
 621 }
 622 EXPORT_SYMBOL(cfg80211_classify8021d);
 623
 624 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 625 {
 626         u8 *end, *pos;
 627
 628         pos = bss->information_elements;
 629         if (pos == NULL)
 630                 return NULL;
 631         end = pos + bss->len_information_elements;
 632
 633         while (pos + 1 < end) {
 634                 if (pos + 2 + pos[1] > end)
 635                         break;
 636                 if (pos[0] == ie)
 637                         return pos;
 638                 pos += 2 + pos[1];
 639         }
 640
 641         return NULL;
 642 }
 643 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 644
 645 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 646 {
 647         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 648         struct net_device *dev = wdev->netdev;
 649         int i;
 650
 651         if (!wdev->connect_keys)
 652                 return;
 653
 654         for (i = 0; i < 6; i++) {
 655                 if (!wdev->connect_keys->params[i].cipher)
 656                         continue;
 657                 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
 658                                         &wdev->connect_keys->params[i])) {
 659                         printk(KERN_ERR "%s: failed to set key %d\n",
 660                                 dev->name, i);
 661                         continue;
 662                 }
 663                 if (wdev->connect_keys->def == i)
 664                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
 665                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
 666                                         dev->name, i);
 667                                 continue;
 668                         }
 669                 if (wdev->connect_keys->defmgmt == i)
 670                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 671                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
 672                                         dev->name, i);
 673         }
 674
 675         kfree(wdev->connect_keys);
 676         wdev->connect_keys = NULL;
 677 }
 678
 679 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 680 {
 681         struct cfg80211_event *ev;
 682         unsigned long flags;
 683         const u8 *bssid = NULL;
 684
 685         spin_lock_irqsave(&wdev->event_lock, flags);
 686         while (!list_empty(&wdev->event_list)) {
 687                 ev = list_first_entry(&wdev->event_list,
 688                                       struct cfg80211_event, list);
 689                 list_del(&ev->list);
 690                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 691
 692                 wdev_lock(wdev);
 693                 switch (ev->type) {
 694                 case EVENT_CONNECT_RESULT:
 695                         if (!is_zero_ether_addr(ev->cr.bssid))
 696                                 bssid = ev->cr.bssid;
 697                         __cfg80211_connect_result(
 698                                 wdev->netdev, bssid,
 699                                 ev->cr.req_ie, ev->cr.req_ie_len,
 700                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 701                                 ev->cr.status,
 702                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 703                                 NULL);
 704                         break;
 705                 case EVENT_ROAMED:
 706                         __cfg80211_roamed(wdev, ev->rm.bssid,
 707                                           ev->rm.req_ie, ev->rm.req_ie_len,
 708                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 709                         break;
 710                 case EVENT_DISCONNECTED:
 711                         __cfg80211_disconnected(wdev->netdev,
 712                                                 ev->dc.ie, ev->dc.ie_len,
 713                                                 ev->dc.reason, true);
 714                         break;
 715                 case EVENT_IBSS_JOINED:
 716                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 717                         break;
 718                 }
 719                 wdev_unlock(wdev);
 720
 721                 kfree(ev);
 722
 723                 spin_lock_irqsave(&wdev->event_lock, flags);
 724         }
 725         spin_unlock_irqrestore(&wdev->event_lock, flags);
 726 }
 727
 728 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 729 {
 730         struct wireless_dev *wdev;
 731
 732         ASSERT_RTNL();
 733         ASSERT_RDEV_LOCK(rdev);
 734
 735         mutex_lock(&rdev->devlist_mtx);
 736
 737         list_for_each_entry(wdev, &rdev->netdev_list, list)
 738                 cfg80211_process_wdev_events(wdev);
 739
 740         mutex_unlock(&rdev->devlist_mtx);
 741 }
 742
 743 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 744                           struct net_device *dev, enum nl80211_iftype ntype,
 745                           u32 *flags, struct vif_params *params)
 746 {
 747         int err;
 748         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 749
 750         ASSERT_RDEV_LOCK(rdev);
 751
 752         /* don't support changing VLANs, you just re-create them */
 753         if (otype == NL80211_IFTYPE_AP_VLAN)
 754                 return -EOPNOTSUPP;
 755
 756         if (!rdev->ops->change_virtual_intf ||
 757             !(rdev->wiphy.interface_modes & (1 << ntype)))
 758                 return -EOPNOTSUPP;
 759
 760         /* if it's part of a bridge, reject changing type to station/ibss */
 761         if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC ||
 762                              ntype == NL80211_IFTYPE_STATION))
 763                 return -EBUSY;
 764
 765         if (ntype != otype) {
 766                 dev->ieee80211_ptr->use_4addr = false;
 767
 768                 switch (otype) {
 769                 case NL80211_IFTYPE_ADHOC:
 770                         cfg80211_leave_ibss(rdev, dev, false);
 771                         break;
 772                 case NL80211_IFTYPE_STATION:
 773                         cfg80211_disconnect(rdev, dev,
 774                                             WLAN_REASON_DEAUTH_LEAVING, true);
 775                         break;
 776                 case NL80211_IFTYPE_MESH_POINT:
 777                         /* mesh should be handled? */
 778                         break;
 779                 default:
 780                         break;
 781                 }
 782
 783                 cfg80211_process_rdev_events(rdev);
 784         }
 785
 786         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 787                                              ntype, flags, params);
 788
 789         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 790
 791         if (!err && params && params->use_4addr != -1)
 792                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 793
 794         if (!err) {
 795                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 796                 switch (ntype) {
 797                 case NL80211_IFTYPE_STATION:
 798                         if (dev->ieee80211_ptr->use_4addr)
 799                                 break;
 800                         /* fall through */
 801                 case NL80211_IFTYPE_ADHOC:
 802                         dev->priv_flags |= IFF_DONT_BRIDGE;
 803                         break;
 804                 case NL80211_IFTYPE_AP:
 805                 case NL80211_IFTYPE_AP_VLAN:
 806                 case NL80211_IFTYPE_WDS:
 807                 case NL80211_IFTYPE_MESH_POINT:
 808                         /* bridging OK */
 809                         break;
 810                 case NL80211_IFTYPE_MONITOR:
 811                         /* monitor can't bridge anyway */
 812                         break;
 813                 case NL80211_IFTYPE_UNSPECIFIED:
 814                 case __NL80211_IFTYPE_AFTER_LAST:
 815                         /* not happening */
 816                         break;
 817                 }
 818         }
 819
 820         return err;
 821 }
 822
 823 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
 824 {
 825         int modulation, streams, bitrate;
 826
 827         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 828                 return rate->legacy;
 829
 830         /* the formula below does only work for MCS values smaller than 32 */
 831         if (rate->mcs >= 32)
 832                 return 0;
 833
 834         modulation = rate->mcs & 7;
 835         streams = (rate->mcs >> 3) + 1;
 836
 837         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 838                         13500000 : 6500000;
 839
 840         if (modulation < 4)
 841                 bitrate *= (modulation + 1);
 842         else if (modulation == 4)
 843                 bitrate *= (modulation + 2);
 844         else
 845                 bitrate *= (modulation + 3);
 846
 847         bitrate *= streams;
 848
 849         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 850                 bitrate = (bitrate / 9) * 10;
 851
 852         /* do NOT round down here */
 853         return (bitrate + 50000) / 100000;
 854 }