SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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                 goto out;
 233         }
 234
 235         if (ieee80211_is_ctl(fc)) {
 236                 /*
 237                  * ACK and CTS are 10 bytes, all others 16. To see how
 238                  * to get this condition consider
 239                  *   subtype mask:   0b0000000011110000 (0x00F0)
 240                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 241                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 242                  *   bits that matter:         ^^^      (0x00E0)
 243                  *   value of those: 0b0000000011000000 (0x00C0)
 244                  */
 245                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 246                         hdrlen = 10;
 247                 else
 248                         hdrlen = 16;
 249         }
 250 out:
 251         return hdrlen;
 252 }
 253 EXPORT_SYMBOL(ieee80211_hdrlen);
 254
 255 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 256 {
 257         const struct ieee80211_hdr *hdr =
 258                         (const struct ieee80211_hdr *)skb->data;
 259         unsigned int hdrlen;
 260
 261         if (unlikely(skb->len < 10))
 262                 return 0;
 263         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 264         if (unlikely(hdrlen > skb->len))
 265                 return 0;
 266         return hdrlen;
 267 }
 268 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 269
 270 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 271 {
 272         int ae = meshhdr->flags & MESH_FLAGS_AE;
 273         /* 7.1.3.5a.2 */
 274         switch (ae) {
 275         case 0:
 276                 return 6;
 277         case MESH_FLAGS_AE_A4:
 278                 return 12;
 279         case MESH_FLAGS_AE_A5_A6:
 280                 return 18;
 281         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 282                 return 24;
 283         default:
 284                 return 6;
 285         }
 286 }
 287
 288 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 289                            enum nl80211_iftype iftype)
 290 {
 291         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 292         u16 hdrlen, ethertype;
 293         u8 *payload;
 294         u8 dst[ETH_ALEN];
 295         u8 src[ETH_ALEN] __aligned(2);
 296
 297         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 298                 return -1;
 299
 300         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 301
 302         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 303          * header
 304          * IEEE 802.11 address fields:
 305          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 306          *   0     0   DA    SA    BSSID n/a
 307          *   0     1   DA    BSSID SA    n/a
 308          *   1     0   BSSID SA    DA    n/a
 309          *   1     1   RA    TA    DA    SA
 310          */
 311         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 312         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 313
 314         switch (hdr->frame_control &
 315                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 316         case cpu_to_le16(IEEE80211_FCTL_TODS):
 317                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 318                              iftype != NL80211_IFTYPE_AP_VLAN))
 319                         return -1;
 320                 break;
 321         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 322                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 323                              iftype != NL80211_IFTYPE_MESH_POINT &&
 324                              iftype != NL80211_IFTYPE_AP_VLAN &&
 325                              iftype != NL80211_IFTYPE_STATION))
 326                         return -1;
 327                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 328                         struct ieee80211s_hdr *meshdr =
 329                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 330                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 331                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 332                                 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
 333                                 memcpy(src, meshdr->eaddr2, ETH_ALEN);
 334                         }
 335                 }
 336                 break;
 337         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 338                 if ((iftype != NL80211_IFTYPE_STATION &&
 339                     iftype != NL80211_IFTYPE_MESH_POINT) ||
 340                     (is_multicast_ether_addr(dst) &&
 341                      !compare_ether_addr(src, addr)))
 342                         return -1;
 343                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 344                         struct ieee80211s_hdr *meshdr =
 345                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 346                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 347                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 348                                 memcpy(src, meshdr->eaddr1, ETH_ALEN);
 349                 }
 350                 break;
 351         case cpu_to_le16(0):
 352                 if (iftype != NL80211_IFTYPE_ADHOC)
 353                         return -1;
 354                 break;
 355         }
 356
 357         if (unlikely(skb->len - hdrlen < 8))
 358                 return -1;
 359
 360         payload = skb->data + hdrlen;
 361         ethertype = (payload[6] << 8) | payload[7];
 362
 363         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 364                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 365                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 366                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 367                  * replace EtherType */
 368                 skb_pull(skb, hdrlen + 6);
 369                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 370                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 371         } else {
 372                 struct ethhdr *ehdr;
 373                 __be16 len;
 374
 375                 skb_pull(skb, hdrlen);
 376                 len = htons(skb->len);
 377                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 378                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 379                 memcpy(ehdr->h_source, src, ETH_ALEN);
 380                 ehdr->h_proto = len;
 381         }
 382         return 0;
 383 }
 384 EXPORT_SYMBOL(ieee80211_data_to_8023);
 385
 386 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 387                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 388 {
 389         struct ieee80211_hdr hdr;
 390         u16 hdrlen, ethertype;
 391         __le16 fc;
 392         const u8 *encaps_data;
 393         int encaps_len, skip_header_bytes;
 394         int nh_pos, h_pos;
 395         int head_need;
 396
 397         if (unlikely(skb->len < ETH_HLEN))
 398                 return -EINVAL;
 399
 400         nh_pos = skb_network_header(skb) - skb->data;
 401         h_pos = skb_transport_header(skb) - skb->data;
 402
 403         /* convert Ethernet header to proper 802.11 header (based on
 404          * operation mode) */
 405         ethertype = (skb->data[12] << 8) | skb->data[13];
 406         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 407
 408         switch (iftype) {
 409         case NL80211_IFTYPE_AP:
 410         case NL80211_IFTYPE_AP_VLAN:
 411                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 412                 /* DA BSSID SA */
 413                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 414                 memcpy(hdr.addr2, addr, ETH_ALEN);
 415                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 416                 hdrlen = 24;
 417                 break;
 418         case NL80211_IFTYPE_STATION:
 419                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 420                 /* BSSID SA DA */
 421                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 422                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 423                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 424                 hdrlen = 24;
 425                 break;
 426         case NL80211_IFTYPE_ADHOC:
 427                 /* DA SA BSSID */
 428                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 429                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 430                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 431                 hdrlen = 24;
 432                 break;
 433         default:
 434                 return -EOPNOTSUPP;
 435         }
 436
 437         if (qos) {
 438                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 439                 hdrlen += 2;
 440         }
 441
 442         hdr.frame_control = fc;
 443         hdr.duration_id = 0;
 444         hdr.seq_ctrl = 0;
 445
 446         skip_header_bytes = ETH_HLEN;
 447         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 448                 encaps_data = bridge_tunnel_header;
 449                 encaps_len = sizeof(bridge_tunnel_header);
 450                 skip_header_bytes -= 2;
 451         } else if (ethertype > 0x600) {
 452                 encaps_data = rfc1042_header;
 453                 encaps_len = sizeof(rfc1042_header);
 454                 skip_header_bytes -= 2;
 455         } else {
 456                 encaps_data = NULL;
 457                 encaps_len = 0;
 458         }
 459
 460         skb_pull(skb, skip_header_bytes);
 461         nh_pos -= skip_header_bytes;
 462         h_pos -= skip_header_bytes;
 463
 464         head_need = hdrlen + encaps_len - skb_headroom(skb);
 465
 466         if (head_need > 0 || skb_cloned(skb)) {
 467                 head_need = max(head_need, 0);
 468                 if (head_need)
 469                         skb_orphan(skb);
 470
 471                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
 472                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
 473                         return -ENOMEM;
 474                 }
 475                 skb->truesize += head_need;
 476         }
 477
 478         if (encaps_data) {
 479                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 480                 nh_pos += encaps_len;
 481                 h_pos += encaps_len;
 482         }
 483
 484         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 485
 486         nh_pos += hdrlen;
 487         h_pos += hdrlen;
 488
 489         /* Update skb pointers to various headers since this modified frame
 490          * is going to go through Linux networking code that may potentially
 491          * need things like pointer to IP header. */
 492         skb_set_mac_header(skb, 0);
 493         skb_set_network_header(skb, nh_pos);
 494         skb_set_transport_header(skb, h_pos);
 495
 496         return 0;
 497 }
 498 EXPORT_SYMBOL(ieee80211_data_from_8023);
 499
 500
 501 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 502                               const u8 *addr, enum nl80211_iftype iftype,
 503                               const unsigned int extra_headroom)
 504 {
 505         struct sk_buff *frame = NULL;
 506         u16 ethertype;
 507         u8 *payload;
 508         const struct ethhdr *eth;
 509         int remaining, err;
 510         u8 dst[ETH_ALEN], src[ETH_ALEN];
 511
 512         err = ieee80211_data_to_8023(skb, addr, iftype);
 513         if (err)
 514                 goto out;
 515
 516         /* skip the wrapping header */
 517         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 518         if (!eth)
 519                 goto out;
 520
 521         while (skb != frame) {
 522                 u8 padding;
 523                 __be16 len = eth->h_proto;
 524                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 525
 526                 remaining = skb->len;
 527                 memcpy(dst, eth->h_dest, ETH_ALEN);
 528                 memcpy(src, eth->h_source, ETH_ALEN);
 529
 530                 padding = (4 - subframe_len) & 0x3;
 531                 /* the last MSDU has no padding */
 532                 if (subframe_len > remaining)
 533                         goto purge;
 534
 535                 skb_pull(skb, sizeof(struct ethhdr));
 536                 /* reuse skb for the last subframe */
 537                 if (remaining <= subframe_len + padding)
 538                         frame = skb;
 539                 else {
 540                         unsigned int hlen = ALIGN(extra_headroom, 4);
 541                         /*
 542                          * Allocate and reserve two bytes more for payload
 543                          * alignment since sizeof(struct ethhdr) is 14.
 544                          */
 545                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 546                         if (!frame)
 547                                 goto purge;
 548
 549                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 550                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 551                                 ntohs(len));
 552
 553                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 554                                                         padding);
 555                         if (!eth) {
 556                                 dev_kfree_skb(frame);
 557                                 goto purge;
 558                         }
 559                 }
 560
 561                 skb_reset_network_header(frame);
 562                 frame->dev = skb->dev;
 563                 frame->priority = skb->priority;
 564
 565                 payload = frame->data;
 566                 ethertype = (payload[6] << 8) | payload[7];
 567
 568                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 569                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 570                            compare_ether_addr(payload,
 571                                               bridge_tunnel_header) == 0)) {
 572                         /* remove RFC1042 or Bridge-Tunnel
 573                          * encapsulation and replace EtherType */
 574                         skb_pull(frame, 6);
 575                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 576                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 577                 } else {
 578                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 579                                 sizeof(__be16));
 580                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 581                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 582                 }
 583                 __skb_queue_tail(list, frame);
 584         }
 585
 586         return;
 587
 588  purge:
 589         __skb_queue_purge(list);
 590  out:
 591         dev_kfree_skb(skb);
 592 }
 593 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 594
 595 /* Given a data frame determine the 802.1p/1d tag to use. */
 596 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 597 {
 598         unsigned int dscp;
 599
 600         /* skb->priority values from 256->263 are magic values to
 601          * directly indicate a specific 802.1d priority.  This is used
 602          * to allow 802.1d priority to be passed directly in from VLAN
 603          * tags, etc.
 604          */
 605         if (skb->priority >= 256 && skb->priority <= 263)
 606                 return skb->priority - 256;
 607
 608         switch (skb->protocol) {
 609         case htons(ETH_P_IP):
 610                 dscp = ip_hdr(skb)->tos & 0xfc;
 611                 break;
 612         default:
 613                 return 0;
 614         }
 615
 616         return dscp >> 5;
 617 }
 618 EXPORT_SYMBOL(cfg80211_classify8021d);
 619
 620 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 621 {
 622         u8 *end, *pos;
 623
 624         pos = bss->information_elements;
 625         if (pos == NULL)
 626                 return NULL;
 627         end = pos + bss->len_information_elements;
 628
 629         while (pos + 1 < end) {
 630                 if (pos + 2 + pos[1] > end)
 631                         break;
 632                 if (pos[0] == ie)
 633                         return pos;
 634                 pos += 2 + pos[1];
 635         }
 636
 637         return NULL;
 638 }
 639 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 640
 641 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 642 {
 643         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 644         struct net_device *dev = wdev->netdev;
 645         int i;
 646
 647         if (!wdev->connect_keys)
 648                 return;
 649
 650         for (i = 0; i < 6; i++) {
 651                 if (!wdev->connect_keys->params[i].cipher)
 652                         continue;
 653                 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
 654                                         &wdev->connect_keys->params[i])) {
 655                         printk(KERN_ERR "%s: failed to set key %d\n",
 656                                 dev->name, i);
 657                         continue;
 658                 }
 659                 if (wdev->connect_keys->def == i)
 660                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
 661                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
 662                                         dev->name, i);
 663                                 continue;
 664                         }
 665                 if (wdev->connect_keys->defmgmt == i)
 666                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 667                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
 668                                         dev->name, i);
 669         }
 670
 671         kfree(wdev->connect_keys);
 672         wdev->connect_keys = NULL;
 673 }
 674
 675 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 676 {
 677         struct cfg80211_event *ev;
 678         unsigned long flags;
 679         const u8 *bssid = NULL;
 680
 681         spin_lock_irqsave(&wdev->event_lock, flags);
 682         while (!list_empty(&wdev->event_list)) {
 683                 ev = list_first_entry(&wdev->event_list,
 684                                       struct cfg80211_event, list);
 685                 list_del(&ev->list);
 686                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 687
 688                 wdev_lock(wdev);
 689                 switch (ev->type) {
 690                 case EVENT_CONNECT_RESULT:
 691                         if (!is_zero_ether_addr(ev->cr.bssid))
 692                                 bssid = ev->cr.bssid;
 693                         __cfg80211_connect_result(
 694                                 wdev->netdev, bssid,
 695                                 ev->cr.req_ie, ev->cr.req_ie_len,
 696                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 697                                 ev->cr.status,
 698                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 699                                 NULL);
 700                         break;
 701                 case EVENT_ROAMED:
 702                         __cfg80211_roamed(wdev, ev->rm.bssid,
 703                                           ev->rm.req_ie, ev->rm.req_ie_len,
 704                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 705                         break;
 706                 case EVENT_DISCONNECTED:
 707                         __cfg80211_disconnected(wdev->netdev,
 708                                                 ev->dc.ie, ev->dc.ie_len,
 709                                                 ev->dc.reason, true);
 710                         break;
 711                 case EVENT_IBSS_JOINED:
 712                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 713                         break;
 714                 }
 715                 wdev_unlock(wdev);
 716
 717                 kfree(ev);
 718
 719                 spin_lock_irqsave(&wdev->event_lock, flags);
 720         }
 721         spin_unlock_irqrestore(&wdev->event_lock, flags);
 722 }
 723
 724 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 725 {
 726         struct wireless_dev *wdev;
 727
 728         ASSERT_RTNL();
 729         ASSERT_RDEV_LOCK(rdev);
 730
 731         mutex_lock(&rdev->devlist_mtx);
 732
 733         list_for_each_entry(wdev, &rdev->netdev_list, list)
 734                 cfg80211_process_wdev_events(wdev);
 735
 736         mutex_unlock(&rdev->devlist_mtx);
 737 }
 738
 739 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 740                           struct net_device *dev, enum nl80211_iftype ntype,
 741                           u32 *flags, struct vif_params *params)
 742 {
 743         int err;
 744         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 745
 746         ASSERT_RDEV_LOCK(rdev);
 747
 748         /* don't support changing VLANs, you just re-create them */
 749         if (otype == NL80211_IFTYPE_AP_VLAN)
 750                 return -EOPNOTSUPP;
 751
 752         if (!rdev->ops->change_virtual_intf ||
 753             !(rdev->wiphy.interface_modes & (1 << ntype)))
 754                 return -EOPNOTSUPP;
 755
 756         /* if it's part of a bridge, reject changing type to station/ibss */
 757         if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC ||
 758                              ntype == NL80211_IFTYPE_STATION))
 759                 return -EBUSY;
 760
 761         if (ntype != otype) {
 762                 dev->ieee80211_ptr->use_4addr = false;
 763
 764                 switch (otype) {
 765                 case NL80211_IFTYPE_ADHOC:
 766                         cfg80211_leave_ibss(rdev, dev, false);
 767                         break;
 768                 case NL80211_IFTYPE_STATION:
 769                         cfg80211_disconnect(rdev, dev,
 770                                             WLAN_REASON_DEAUTH_LEAVING, true);
 771                         break;
 772                 case NL80211_IFTYPE_MESH_POINT:
 773                         /* mesh should be handled? */
 774                         break;
 775                 default:
 776                         break;
 777                 }
 778
 779                 cfg80211_process_rdev_events(rdev);
 780         }
 781
 782         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 783                                              ntype, flags, params);
 784
 785         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 786
 787         if (!err && params && params->use_4addr != -1)
 788                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 789
 790         if (!err) {
 791                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 792                 switch (ntype) {
 793                 case NL80211_IFTYPE_STATION:
 794                         if (dev->ieee80211_ptr->use_4addr)
 795                                 break;
 796                         /* fall through */
 797                 case NL80211_IFTYPE_ADHOC:
 798                         dev->priv_flags |= IFF_DONT_BRIDGE;
 799                         break;
 800                 case NL80211_IFTYPE_AP:
 801                 case NL80211_IFTYPE_AP_VLAN:
 802                 case NL80211_IFTYPE_WDS:
 803                 case NL80211_IFTYPE_MESH_POINT:
 804                         /* bridging OK */
 805                         break;
 806                 case NL80211_IFTYPE_MONITOR:
 807                         /* monitor can't bridge anyway */
 808                         break;
 809                 case NL80211_IFTYPE_UNSPECIFIED:
 810                 case __NL80211_IFTYPE_AFTER_LAST:
 811                         /* not happening */
 812                         break;
 813                 }
 814         }
 815
 816         return err;
 817 }
 818
 819 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
 820 {
 821         int modulation, streams, bitrate;
 822
 823         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 824                 return rate->legacy;
 825
 826         /* the formula below does only work for MCS values smaller than 32 */
 827         if (rate->mcs >= 32)
 828                 return 0;
 829
 830         modulation = rate->mcs & 7;
 831         streams = (rate->mcs >> 3) + 1;
 832
 833         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 834                         13500000 : 6500000;
 835
 836         if (modulation < 4)
 837                 bitrate *= (modulation + 1);
 838         else if (modulation == 4)
 839                 bitrate *= (modulation + 2);
 840         else
 841                 bitrate *= (modulation + 3);
 842
 843         bitrate *= streams;
 844
 845         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 846                 bitrate = (bitrate / 9) * 10;
 847
 848         /* do NOT round down here */
 849         return (bitrate + 50000) / 100000;
 850 }