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                                    bool pairwise, const u8 *mac_addr)
 148 {
 149         int i;
 150
 151         if (key_idx > 5)
 152                 return -EINVAL;
 153
 154         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 155                 return -EINVAL;
 156
 157         if (pairwise && !mac_addr)
 158                 return -EINVAL;
 159
 160         /*
 161          * Disallow pairwise keys with non-zero index unless it's WEP
 162          * (because current deployments use pairwise WEP keys with
 163          * non-zero indizes but 802.11i clearly specifies to use zero)
 164          */
 165         if (pairwise && key_idx &&
 166             params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
 167             params->cipher != WLAN_CIPHER_SUITE_WEP104)
 168                 return -EINVAL;
 169
 170         switch (params->cipher) {
 171         case WLAN_CIPHER_SUITE_WEP40:
 172                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 173                         return -EINVAL;
 174                 break;
 175         case WLAN_CIPHER_SUITE_TKIP:
 176                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 177                         return -EINVAL;
 178                 break;
 179         case WLAN_CIPHER_SUITE_CCMP:
 180                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 181                         return -EINVAL;
 182                 break;
 183         case WLAN_CIPHER_SUITE_WEP104:
 184                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 185                         return -EINVAL;
 186                 break;
 187         case WLAN_CIPHER_SUITE_AES_CMAC:
 188                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 189                         return -EINVAL;
 190                 break;
 191         default:
 192                 /*
 193                  * We don't know anything about this algorithm,
 194                  * allow using it -- but the driver must check
 195                  * all parameters! We still check below whether
 196                  * or not the driver supports this algorithm,
 197                  * of course.
 198                  */
 199                 break;
 200         }
 201
 202         if (params->seq) {
 203                 switch (params->cipher) {
 204                 case WLAN_CIPHER_SUITE_WEP40:
 205                 case WLAN_CIPHER_SUITE_WEP104:
 206                         /* These ciphers do not use key sequence */
 207                         return -EINVAL;
 208                 case WLAN_CIPHER_SUITE_TKIP:
 209                 case WLAN_CIPHER_SUITE_CCMP:
 210                 case WLAN_CIPHER_SUITE_AES_CMAC:
 211                         if (params->seq_len != 6)
 212                                 return -EINVAL;
 213                         break;
 214                 }
 215         }
 216
 217         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
 218                 if (params->cipher == rdev->wiphy.cipher_suites[i])
 219                         break;
 220         if (i == rdev->wiphy.n_cipher_suites)
 221                 return -EINVAL;
 222
 223         return 0;
 224 }
 225
 226 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
 227 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
 228 const unsigned char rfc1042_header[] __aligned(2) =
 229         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 230 EXPORT_SYMBOL(rfc1042_header);
 231
 232 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 233 const unsigned char bridge_tunnel_header[] __aligned(2) =
 234         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 235 EXPORT_SYMBOL(bridge_tunnel_header);
 236
 237 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 238 {
 239         unsigned int hdrlen = 24;
 240
 241         if (ieee80211_is_data(fc)) {
 242                 if (ieee80211_has_a4(fc))
 243                         hdrlen = 30;
 244                 if (ieee80211_is_data_qos(fc)) {
 245                         hdrlen += IEEE80211_QOS_CTL_LEN;
 246                         if (ieee80211_has_order(fc))
 247                                 hdrlen += IEEE80211_HT_CTL_LEN;
 248                 }
 249                 goto out;
 250         }
 251
 252         if (ieee80211_is_ctl(fc)) {
 253                 /*
 254                  * ACK and CTS are 10 bytes, all others 16. To see how
 255                  * to get this condition consider
 256                  *   subtype mask:   0b0000000011110000 (0x00F0)
 257                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 258                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 259                  *   bits that matter:         ^^^      (0x00E0)
 260                  *   value of those: 0b0000000011000000 (0x00C0)
 261                  */
 262                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 263                         hdrlen = 10;
 264                 else
 265                         hdrlen = 16;
 266         }
 267 out:
 268         return hdrlen;
 269 }
 270 EXPORT_SYMBOL(ieee80211_hdrlen);
 271
 272 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 273 {
 274         const struct ieee80211_hdr *hdr =
 275                         (const struct ieee80211_hdr *)skb->data;
 276         unsigned int hdrlen;
 277
 278         if (unlikely(skb->len < 10))
 279                 return 0;
 280         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 281         if (unlikely(hdrlen > skb->len))
 282                 return 0;
 283         return hdrlen;
 284 }
 285 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 286
 287 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 288 {
 289         int ae = meshhdr->flags & MESH_FLAGS_AE;
 290         /* 7.1.3.5a.2 */
 291         switch (ae) {
 292         case 0:
 293                 return 6;
 294         case MESH_FLAGS_AE_A4:
 295                 return 12;
 296         case MESH_FLAGS_AE_A5_A6:
 297                 return 18;
 298         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 299                 return 24;
 300         default:
 301                 return 6;
 302         }
 303 }
 304
 305 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 306                            enum nl80211_iftype iftype)
 307 {
 308         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 309         u16 hdrlen, ethertype;
 310         u8 *payload;
 311         u8 dst[ETH_ALEN];
 312         u8 src[ETH_ALEN] __aligned(2);
 313
 314         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 315                 return -1;
 316
 317         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 318
 319         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 320          * header
 321          * IEEE 802.11 address fields:
 322          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 323          *   0     0   DA    SA    BSSID n/a
 324          *   0     1   DA    BSSID SA    n/a
 325          *   1     0   BSSID SA    DA    n/a
 326          *   1     1   RA    TA    DA    SA
 327          */
 328         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 329         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 330
 331         switch (hdr->frame_control &
 332                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 333         case cpu_to_le16(IEEE80211_FCTL_TODS):
 334                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 335                              iftype != NL80211_IFTYPE_AP_VLAN &&
 336                              iftype != NL80211_IFTYPE_P2P_GO))
 337                         return -1;
 338                 break;
 339         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 340                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 341                              iftype != NL80211_IFTYPE_MESH_POINT &&
 342                              iftype != NL80211_IFTYPE_AP_VLAN &&
 343                              iftype != NL80211_IFTYPE_STATION))
 344                         return -1;
 345                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 346                         struct ieee80211s_hdr *meshdr =
 347                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 348                         /* make sure meshdr->flags is on the linear part */
 349                         if (!pskb_may_pull(skb, hdrlen + 1))
 350                                 return -1;
 351                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 352                                 skb_copy_bits(skb, hdrlen +
 353                                         offsetof(struct ieee80211s_hdr, eaddr1),
 354                                         dst, ETH_ALEN);
 355                                 skb_copy_bits(skb, hdrlen +
 356                                         offsetof(struct ieee80211s_hdr, eaddr2),
 357                                         src, ETH_ALEN);
 358                         }
 359                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 360                 }
 361                 break;
 362         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 363                 if ((iftype != NL80211_IFTYPE_STATION &&
 364                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 365                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 366                     (is_multicast_ether_addr(dst) &&
 367                      !compare_ether_addr(src, addr)))
 368                         return -1;
 369                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 370                         struct ieee80211s_hdr *meshdr =
 371                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
 372                         /* make sure meshdr->flags is on the linear part */
 373                         if (!pskb_may_pull(skb, hdrlen + 1))
 374                                 return -1;
 375                         if (meshdr->flags & MESH_FLAGS_AE_A4)
 376                                 skb_copy_bits(skb, hdrlen +
 377                                         offsetof(struct ieee80211s_hdr, eaddr1),
 378                                         src, ETH_ALEN);
 379                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 380                 }
 381                 break;
 382         case cpu_to_le16(0):
 383                 if (iftype != NL80211_IFTYPE_ADHOC)
 384                         return -1;
 385                 break;
 386         }
 387
 388         if (!pskb_may_pull(skb, hdrlen + 8))
 389                 return -1;
 390
 391         payload = skb->data + hdrlen;
 392         ethertype = (payload[6] << 8) | payload[7];
 393
 394         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 395                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 396                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
 397                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 398                  * replace EtherType */
 399                 skb_pull(skb, hdrlen + 6);
 400                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 401                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 402         } else {
 403                 struct ethhdr *ehdr;
 404                 __be16 len;
 405
 406                 skb_pull(skb, hdrlen);
 407                 len = htons(skb->len);
 408                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 409                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
 410                 memcpy(ehdr->h_source, src, ETH_ALEN);
 411                 ehdr->h_proto = len;
 412         }
 413         return 0;
 414 }
 415 EXPORT_SYMBOL(ieee80211_data_to_8023);
 416
 417 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 418                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
 419 {
 420         struct ieee80211_hdr hdr;
 421         u16 hdrlen, ethertype;
 422         __le16 fc;
 423         const u8 *encaps_data;
 424         int encaps_len, skip_header_bytes;
 425         int nh_pos, h_pos;
 426         int head_need;
 427
 428         if (unlikely(skb->len < ETH_HLEN))
 429                 return -EINVAL;
 430
 431         nh_pos = skb_network_header(skb) - skb->data;
 432         h_pos = skb_transport_header(skb) - skb->data;
 433
 434         /* convert Ethernet header to proper 802.11 header (based on
 435          * operation mode) */
 436         ethertype = (skb->data[12] << 8) | skb->data[13];
 437         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 438
 439         switch (iftype) {
 440         case NL80211_IFTYPE_AP:
 441         case NL80211_IFTYPE_AP_VLAN:
 442         case NL80211_IFTYPE_P2P_GO:
 443                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 444                 /* DA BSSID SA */
 445                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 446                 memcpy(hdr.addr2, addr, ETH_ALEN);
 447                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 448                 hdrlen = 24;
 449                 break;
 450         case NL80211_IFTYPE_STATION:
 451         case NL80211_IFTYPE_P2P_CLIENT:
 452                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 453                 /* BSSID SA DA */
 454                 memcpy(hdr.addr1, bssid, ETH_ALEN);
 455                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 456                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
 457                 hdrlen = 24;
 458                 break;
 459         case NL80211_IFTYPE_ADHOC:
 460                 /* DA SA BSSID */
 461                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
 462                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 463                 memcpy(hdr.addr3, bssid, ETH_ALEN);
 464                 hdrlen = 24;
 465                 break;
 466         default:
 467                 return -EOPNOTSUPP;
 468         }
 469
 470         if (qos) {
 471                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 472                 hdrlen += 2;
 473         }
 474
 475         hdr.frame_control = fc;
 476         hdr.duration_id = 0;
 477         hdr.seq_ctrl = 0;
 478
 479         skip_header_bytes = ETH_HLEN;
 480         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 481                 encaps_data = bridge_tunnel_header;
 482                 encaps_len = sizeof(bridge_tunnel_header);
 483                 skip_header_bytes -= 2;
 484         } else if (ethertype > 0x600) {
 485                 encaps_data = rfc1042_header;
 486                 encaps_len = sizeof(rfc1042_header);
 487                 skip_header_bytes -= 2;
 488         } else {
 489                 encaps_data = NULL;
 490                 encaps_len = 0;
 491         }
 492
 493         skb_pull(skb, skip_header_bytes);
 494         nh_pos -= skip_header_bytes;
 495         h_pos -= skip_header_bytes;
 496
 497         head_need = hdrlen + encaps_len - skb_headroom(skb);
 498
 499         if (head_need > 0 || skb_cloned(skb)) {
 500                 head_need = max(head_need, 0);
 501                 if (head_need)
 502                         skb_orphan(skb);
 503
 504                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
 505                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
 506                         return -ENOMEM;
 507                 }
 508                 skb->truesize += head_need;
 509         }
 510
 511         if (encaps_data) {
 512                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 513                 nh_pos += encaps_len;
 514                 h_pos += encaps_len;
 515         }
 516
 517         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 518
 519         nh_pos += hdrlen;
 520         h_pos += hdrlen;
 521
 522         /* Update skb pointers to various headers since this modified frame
 523          * is going to go through Linux networking code that may potentially
 524          * need things like pointer to IP header. */
 525         skb_set_mac_header(skb, 0);
 526         skb_set_network_header(skb, nh_pos);
 527         skb_set_transport_header(skb, h_pos);
 528
 529         return 0;
 530 }
 531 EXPORT_SYMBOL(ieee80211_data_from_8023);
 532
 533
 534 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 535                               const u8 *addr, enum nl80211_iftype iftype,
 536                               const unsigned int extra_headroom)
 537 {
 538         struct sk_buff *frame = NULL;
 539         u16 ethertype;
 540         u8 *payload;
 541         const struct ethhdr *eth;
 542         int remaining, err;
 543         u8 dst[ETH_ALEN], src[ETH_ALEN];
 544
 545         err = ieee80211_data_to_8023(skb, addr, iftype);
 546         if (err)
 547                 goto out;
 548
 549         /* skip the wrapping header */
 550         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 551         if (!eth)
 552                 goto out;
 553
 554         while (skb != frame) {
 555                 u8 padding;
 556                 __be16 len = eth->h_proto;
 557                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 558
 559                 remaining = skb->len;
 560                 memcpy(dst, eth->h_dest, ETH_ALEN);
 561                 memcpy(src, eth->h_source, ETH_ALEN);
 562
 563                 padding = (4 - subframe_len) & 0x3;
 564                 /* the last MSDU has no padding */
 565                 if (subframe_len > remaining)
 566                         goto purge;
 567
 568                 skb_pull(skb, sizeof(struct ethhdr));
 569                 /* reuse skb for the last subframe */
 570                 if (remaining <= subframe_len + padding)
 571                         frame = skb;
 572                 else {
 573                         unsigned int hlen = ALIGN(extra_headroom, 4);
 574                         /*
 575                          * Allocate and reserve two bytes more for payload
 576                          * alignment since sizeof(struct ethhdr) is 14.
 577                          */
 578                         frame = dev_alloc_skb(hlen + subframe_len + 2);
 579                         if (!frame)
 580                                 goto purge;
 581
 582                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 583                         memcpy(skb_put(frame, ntohs(len)), skb->data,
 584                                 ntohs(len));
 585
 586                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 587                                                         padding);
 588                         if (!eth) {
 589                                 dev_kfree_skb(frame);
 590                                 goto purge;
 591                         }
 592                 }
 593
 594                 skb_reset_network_header(frame);
 595                 frame->dev = skb->dev;
 596                 frame->priority = skb->priority;
 597
 598                 payload = frame->data;
 599                 ethertype = (payload[6] << 8) | payload[7];
 600
 601                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
 602                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 603                            compare_ether_addr(payload,
 604                                               bridge_tunnel_header) == 0)) {
 605                         /* remove RFC1042 or Bridge-Tunnel
 606                          * encapsulation and replace EtherType */
 607                         skb_pull(frame, 6);
 608                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 609                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 610                 } else {
 611                         memcpy(skb_push(frame, sizeof(__be16)), &len,
 612                                 sizeof(__be16));
 613                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 614                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 615                 }
 616                 __skb_queue_tail(list, frame);
 617         }
 618
 619         return;
 620
 621  purge:
 622         __skb_queue_purge(list);
 623  out:
 624         dev_kfree_skb(skb);
 625 }
 626 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 627
 628 /* Given a data frame determine the 802.1p/1d tag to use. */
 629 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 630 {
 631         unsigned int dscp;
 632
 633         /* skb->priority values from 256->263 are magic values to
 634          * directly indicate a specific 802.1d priority.  This is used
 635          * to allow 802.1d priority to be passed directly in from VLAN
 636          * tags, etc.
 637          */
 638         if (skb->priority >= 256 && skb->priority <= 263)
 639                 return skb->priority - 256;
 640
 641         switch (skb->protocol) {
 642         case htons(ETH_P_IP):
 643                 dscp = ip_hdr(skb)->tos & 0xfc;
 644                 break;
 645         default:
 646                 return 0;
 647         }
 648
 649         return dscp >> 5;
 650 }
 651 EXPORT_SYMBOL(cfg80211_classify8021d);
 652
 653 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 654 {
 655         u8 *end, *pos;
 656
 657         pos = bss->information_elements;
 658         if (pos == NULL)
 659                 return NULL;
 660         end = pos + bss->len_information_elements;
 661
 662         while (pos + 1 < end) {
 663                 if (pos + 2 + pos[1] > end)
 664                         break;
 665                 if (pos[0] == ie)
 666                         return pos;
 667                 pos += 2 + pos[1];
 668         }
 669
 670         return NULL;
 671 }
 672 EXPORT_SYMBOL(ieee80211_bss_get_ie);
 673
 674 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 675 {
 676         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 677         struct net_device *dev = wdev->netdev;
 678         int i;
 679
 680         if (!wdev->connect_keys)
 681                 return;
 682
 683         for (i = 0; i < 6; i++) {
 684                 if (!wdev->connect_keys->params[i].cipher)
 685                         continue;
 686                 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
 687                                         &wdev->connect_keys->params[i])) {
 688                         printk(KERN_ERR "%s: failed to set key %d\n",
 689                                 dev->name, i);
 690                         continue;
 691                 }
 692                 if (wdev->connect_keys->def == i)
 693                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
 694                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
 695                                         dev->name, i);
 696                                 continue;
 697                         }
 698                 if (wdev->connect_keys->defmgmt == i)
 699                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 700                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
 701                                         dev->name, i);
 702         }
 703
 704         kfree(wdev->connect_keys);
 705         wdev->connect_keys = NULL;
 706 }
 707
 708 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 709 {
 710         struct cfg80211_event *ev;
 711         unsigned long flags;
 712         const u8 *bssid = NULL;
 713
 714         spin_lock_irqsave(&wdev->event_lock, flags);
 715         while (!list_empty(&wdev->event_list)) {
 716                 ev = list_first_entry(&wdev->event_list,
 717                                       struct cfg80211_event, list);
 718                 list_del(&ev->list);
 719                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 720
 721                 wdev_lock(wdev);
 722                 switch (ev->type) {
 723                 case EVENT_CONNECT_RESULT:
 724                         if (!is_zero_ether_addr(ev->cr.bssid))
 725                                 bssid = ev->cr.bssid;
 726                         __cfg80211_connect_result(
 727                                 wdev->netdev, bssid,
 728                                 ev->cr.req_ie, ev->cr.req_ie_len,
 729                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 730                                 ev->cr.status,
 731                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 732                                 NULL);
 733                         break;
 734                 case EVENT_ROAMED:
 735                         __cfg80211_roamed(wdev, ev->rm.bssid,
 736                                           ev->rm.req_ie, ev->rm.req_ie_len,
 737                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 738                         break;
 739                 case EVENT_DISCONNECTED:
 740                         __cfg80211_disconnected(wdev->netdev,
 741                                                 ev->dc.ie, ev->dc.ie_len,
 742                                                 ev->dc.reason, true);
 743                         break;
 744                 case EVENT_IBSS_JOINED:
 745                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 746                         break;
 747                 }
 748                 wdev_unlock(wdev);
 749
 750                 kfree(ev);
 751
 752                 spin_lock_irqsave(&wdev->event_lock, flags);
 753         }
 754         spin_unlock_irqrestore(&wdev->event_lock, flags);
 755 }
 756
 757 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 758 {
 759         struct wireless_dev *wdev;
 760
 761         ASSERT_RTNL();
 762         ASSERT_RDEV_LOCK(rdev);
 763
 764         mutex_lock(&rdev->devlist_mtx);
 765
 766         list_for_each_entry(wdev, &rdev->netdev_list, list)
 767                 cfg80211_process_wdev_events(wdev);
 768
 769         mutex_unlock(&rdev->devlist_mtx);
 770 }
 771
 772 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 773                           struct net_device *dev, enum nl80211_iftype ntype,
 774                           u32 *flags, struct vif_params *params)
 775 {
 776         int err;
 777         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 778
 779         ASSERT_RDEV_LOCK(rdev);
 780
 781         /* don't support changing VLANs, you just re-create them */
 782         if (otype == NL80211_IFTYPE_AP_VLAN)
 783                 return -EOPNOTSUPP;
 784
 785         if (!rdev->ops->change_virtual_intf ||
 786             !(rdev->wiphy.interface_modes & (1 << ntype)))
 787                 return -EOPNOTSUPP;
 788
 789         /* if it's part of a bridge, reject changing type to station/ibss */
 790         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 791             (ntype == NL80211_IFTYPE_ADHOC ||
 792              ntype == NL80211_IFTYPE_STATION ||
 793              ntype == NL80211_IFTYPE_P2P_CLIENT))
 794                 return -EBUSY;
 795
 796         if (ntype != otype) {
 797                 dev->ieee80211_ptr->use_4addr = false;
 798
 799                 switch (otype) {
 800                 case NL80211_IFTYPE_ADHOC:
 801                         cfg80211_leave_ibss(rdev, dev, false);
 802                         break;
 803                 case NL80211_IFTYPE_STATION:
 804                 case NL80211_IFTYPE_P2P_CLIENT:
 805                         cfg80211_disconnect(rdev, dev,
 806                                             WLAN_REASON_DEAUTH_LEAVING, true);
 807                         break;
 808                 case NL80211_IFTYPE_MESH_POINT:
 809                         /* mesh should be handled? */
 810                         break;
 811                 default:
 812                         break;
 813                 }
 814
 815                 cfg80211_process_rdev_events(rdev);
 816         }
 817
 818         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 819                                              ntype, flags, params);
 820
 821         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 822
 823         if (!err && params && params->use_4addr != -1)
 824                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
 825
 826         if (!err) {
 827                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
 828                 switch (ntype) {
 829                 case NL80211_IFTYPE_STATION:
 830                         if (dev->ieee80211_ptr->use_4addr)
 831                                 break;
 832                         /* fall through */
 833                 case NL80211_IFTYPE_P2P_CLIENT:
 834                 case NL80211_IFTYPE_ADHOC:
 835                         dev->priv_flags |= IFF_DONT_BRIDGE;
 836                         break;
 837                 case NL80211_IFTYPE_P2P_GO:
 838                 case NL80211_IFTYPE_AP:
 839                 case NL80211_IFTYPE_AP_VLAN:
 840                 case NL80211_IFTYPE_WDS:
 841                 case NL80211_IFTYPE_MESH_POINT:
 842                         /* bridging OK */
 843                         break;
 844                 case NL80211_IFTYPE_MONITOR:
 845                         /* monitor can't bridge anyway */
 846                         break;
 847                 case NL80211_IFTYPE_UNSPECIFIED:
 848                 case NUM_NL80211_IFTYPES:
 849                         /* not happening */
 850                         break;
 851                 }
 852         }
 853
 854         return err;
 855 }
 856
 857 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
 858 {
 859         int modulation, streams, bitrate;
 860
 861         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 862                 return rate->legacy;
 863
 864         /* the formula below does only work for MCS values smaller than 32 */
 865         if (rate->mcs >= 32)
 866                 return 0;
 867
 868         modulation = rate->mcs & 7;
 869         streams = (rate->mcs >> 3) + 1;
 870
 871         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 872                         13500000 : 6500000;
 873
 874         if (modulation < 4)
 875                 bitrate *= (modulation + 1);
 876         else if (modulation == 4)
 877                 bitrate *= (modulation + 2);
 878         else
 879                 bitrate *= (modulation + 3);
 880
 881         bitrate *= streams;
 882
 883         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 884                 bitrate = (bitrate / 9) * 10;
 885
 886         /* do NOT round down here */
 887         return (bitrate + 50000) / 100000;
 888 }