net/ieee80211/ieee80211_rx.c

   1 /*
   2  * Original code based Host AP (software wireless LAN access point) driver
   3  * for Intersil Prism2/2.5/3 - hostap.o module, common routines
   4  *
   5  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   6  * <jkmaline@cc.hut.fi>
   7  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   8  * Copyright (c) 2004-2005, Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation. See README and COPYING for
  13  * more details.
  14  */
  15
  16 #include <linux/compiler.h>
  17 #include <linux/config.h>
  18 #include <linux/errno.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/in6.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <linux/tcp.h>
  30 #include <linux/types.h>
  31 #include <linux/wireless.h>
  32 #include <linux/etherdevice.h>
  33 #include <asm/uaccess.h>
  34 #include <linux/ctype.h>
  35
  36 #include <net/ieee80211.h>
  37
  38 static void ieee80211_monitor_rx(struct ieee80211_device *ieee,
  39                                         struct sk_buff *skb,
  40                                         struct ieee80211_rx_stats *rx_stats)
  41 {
  42         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  43         u16 fc = le16_to_cpu(hdr->frame_ctl);
  44
  45         skb->dev = ieee->dev;
  46         skb->mac.raw = skb->data;
  47         skb_pull(skb, ieee80211_get_hdrlen(fc));
  48         skb->pkt_type = PACKET_OTHERHOST;
  49         skb->protocol = __constant_htons(ETH_P_80211_RAW);
  50         memset(skb->cb, 0, sizeof(skb->cb));
  51         netif_rx(skb);
  52 }
  53
  54 /* Called only as a tasklet (software IRQ) */
  55 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
  56                                                               ieee80211_device
  57                                                               *ieee,
  58                                                               unsigned int seq,
  59                                                               unsigned int frag,
  60                                                               u8 * src,
  61                                                               u8 * dst)
  62 {
  63         struct ieee80211_frag_entry *entry;
  64         int i;
  65
  66         for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
  67                 entry = &ieee->frag_cache[i];
  68                 if (entry->skb != NULL &&
  69                     time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
  70                         IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
  71                                              "seq=%u last_frag=%u\n",
  72                                              entry->seq, entry->last_frag);
  73                         dev_kfree_skb_any(entry->skb);
  74                         entry->skb = NULL;
  75                 }
  76
  77                 if (entry->skb != NULL && entry->seq == seq &&
  78                     (entry->last_frag + 1 == frag || frag == -1) &&
  79                     !compare_ether_addr(entry->src_addr, src) &&
  80                     !compare_ether_addr(entry->dst_addr, dst))
  81                         return entry;
  82         }
  83
  84         return NULL;
  85 }
  86
  87 /* Called only as a tasklet (software IRQ) */
  88 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
  89                                                 struct ieee80211_hdr_4addr *hdr)
  90 {
  91         struct sk_buff *skb = NULL;
  92         u16 sc;
  93         unsigned int frag, seq;
  94         struct ieee80211_frag_entry *entry;
  95
  96         sc = le16_to_cpu(hdr->seq_ctl);
  97         frag = WLAN_GET_SEQ_FRAG(sc);
  98         seq = WLAN_GET_SEQ_SEQ(sc);
  99
 100         if (frag == 0) {
 101                 /* Reserve enough space to fit maximum frame length */
 102                 skb = dev_alloc_skb(ieee->dev->mtu +
 103                                     sizeof(struct ieee80211_hdr_4addr) +
 104                                     8 /* LLC */  +
 105                                     2 /* alignment */  +
 106                                     8 /* WEP */  + ETH_ALEN /* WDS */ );
 107                 if (skb == NULL)
 108                         return NULL;
 109
 110                 entry = &ieee->frag_cache[ieee->frag_next_idx];
 111                 ieee->frag_next_idx++;
 112                 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
 113                         ieee->frag_next_idx = 0;
 114
 115                 if (entry->skb != NULL)
 116                         dev_kfree_skb_any(entry->skb);
 117
 118                 entry->first_frag_time = jiffies;
 119                 entry->seq = seq;
 120                 entry->last_frag = frag;
 121                 entry->skb = skb;
 122                 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
 123                 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
 124         } else {
 125                 /* received a fragment of a frame for which the head fragment
 126                  * should have already been received */
 127                 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
 128                                                   hdr->addr1);
 129                 if (entry != NULL) {
 130                         entry->last_frag = frag;
 131                         skb = entry->skb;
 132                 }
 133         }
 134
 135         return skb;
 136 }
 137
 138 /* Called only as a tasklet (software IRQ) */
 139 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
 140                                            struct ieee80211_hdr_4addr *hdr)
 141 {
 142         u16 sc;
 143         unsigned int seq;
 144         struct ieee80211_frag_entry *entry;
 145
 146         sc = le16_to_cpu(hdr->seq_ctl);
 147         seq = WLAN_GET_SEQ_SEQ(sc);
 148
 149         entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
 150                                           hdr->addr1);
 151
 152         if (entry == NULL) {
 153                 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
 154                                      "entry (seq=%u)\n", seq);
 155                 return -1;
 156         }
 157
 158         entry->skb = NULL;
 159         return 0;
 160 }
 161
 162 #ifdef NOT_YET
 163 /* ieee80211_rx_frame_mgtmt
 164  *
 165  * Responsible for handling management control frames
 166  *
 167  * Called by ieee80211_rx */
 168 static int
 169 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
 170                         struct ieee80211_rx_stats *rx_stats, u16 type,
 171                         u16 stype)
 172 {
 173         if (ieee->iw_mode == IW_MODE_MASTER) {
 174                 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
 175                        ieee->dev->name);
 176                 return 0;
 177 /*
 178   hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
 179   skb->data);*/
 180         }
 181
 182         if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
 183                 if (stype == WLAN_FC_STYPE_BEACON &&
 184                     ieee->iw_mode == IW_MODE_MASTER) {
 185                         struct sk_buff *skb2;
 186                         /* Process beacon frames also in kernel driver to
 187                          * update STA(AP) table statistics */
 188                         skb2 = skb_clone(skb, GFP_ATOMIC);
 189                         if (skb2)
 190                                 hostap_rx(skb2->dev, skb2, rx_stats);
 191                 }
 192
 193                 /* send management frames to the user space daemon for
 194                  * processing */
 195                 ieee->apdevstats.rx_packets++;
 196                 ieee->apdevstats.rx_bytes += skb->len;
 197                 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
 198                 return 0;
 199         }
 200
 201         if (ieee->iw_mode == IW_MODE_MASTER) {
 202                 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
 203                         printk(KERN_DEBUG "%s: unknown management frame "
 204                                "(type=0x%02x, stype=0x%02x) dropped\n",
 205                                skb->dev->name, type, stype);
 206                         return -1;
 207                 }
 208
 209                 hostap_rx(skb->dev, skb, rx_stats);
 210                 return 0;
 211         }
 212
 213         printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
 214                "received in non-Host AP mode\n", skb->dev->name);
 215         return -1;
 216 }
 217 #endif
 218
 219 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
 220 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
 221 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 222
 223 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 224 static unsigned char bridge_tunnel_header[] =
 225     { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 226 /* No encapsulation header if EtherType < 0x600 (=length) */
 227
 228 /* Called by ieee80211_rx_frame_decrypt */
 229 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
 230                                     struct sk_buff *skb)
 231 {
 232         struct net_device *dev = ieee->dev;
 233         u16 fc, ethertype;
 234         struct ieee80211_hdr_3addr *hdr;
 235         u8 *pos;
 236
 237         if (skb->len < 24)
 238                 return 0;
 239
 240         hdr = (struct ieee80211_hdr_3addr *)skb->data;
 241         fc = le16_to_cpu(hdr->frame_ctl);
 242
 243         /* check that the frame is unicast frame to us */
 244         if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 245             IEEE80211_FCTL_TODS &&
 246             !compare_ether_addr(hdr->addr1, dev->dev_addr) &&
 247             !compare_ether_addr(hdr->addr3, dev->dev_addr)) {
 248                 /* ToDS frame with own addr BSSID and DA */
 249         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 250                    IEEE80211_FCTL_FROMDS &&
 251                    !compare_ether_addr(hdr->addr1, dev->dev_addr)) {
 252                 /* FromDS frame with own addr as DA */
 253         } else
 254                 return 0;
 255
 256         if (skb->len < 24 + 8)
 257                 return 0;
 258
 259         /* check for port access entity Ethernet type */
 260         pos = skb->data + 24;
 261         ethertype = (pos[6] << 8) | pos[7];
 262         if (ethertype == ETH_P_PAE)
 263                 return 1;
 264
 265         return 0;
 266 }
 267
 268 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
 269 static int
 270 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
 271                            struct ieee80211_crypt_data *crypt)
 272 {
 273         struct ieee80211_hdr_3addr *hdr;
 274         int res, hdrlen;
 275
 276         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 277                 return 0;
 278
 279         hdr = (struct ieee80211_hdr_3addr *)skb->data;
 280         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 281
 282         atomic_inc(&crypt->refcnt);
 283         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 284         atomic_dec(&crypt->refcnt);
 285         if (res < 0) {
 286                 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
 287                                      ") res=%d\n", MAC_ARG(hdr->addr2), res);
 288                 if (res == -2)
 289                         IEEE80211_DEBUG_DROP("Decryption failed ICV "
 290                                              "mismatch (key %d)\n",
 291                                              skb->data[hdrlen + 3] >> 6);
 292                 ieee->ieee_stats.rx_discards_undecryptable++;
 293                 return -1;
 294         }
 295
 296         return res;
 297 }
 298
 299 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
 300 static int
 301 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
 302                                 struct sk_buff *skb, int keyidx,
 303                                 struct ieee80211_crypt_data *crypt)
 304 {
 305         struct ieee80211_hdr_3addr *hdr;
 306         int res, hdrlen;
 307
 308         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 309                 return 0;
 310
 311         hdr = (struct ieee80211_hdr_3addr *)skb->data;
 312         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 313
 314         atomic_inc(&crypt->refcnt);
 315         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 316         atomic_dec(&crypt->refcnt);
 317         if (res < 0) {
 318                 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
 319                        " (SA=" MAC_FMT " keyidx=%d)\n",
 320                        ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
 321                 return -1;
 322         }
 323
 324         return 0;
 325 }
 326
 327 /* All received frames are sent to this function. @skb contains the frame in
 328  * IEEE 802.11 format, i.e., in the format it was sent over air.
 329  * This function is called only as a tasklet (software IRQ). */
 330 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 331                  struct ieee80211_rx_stats *rx_stats)
 332 {
 333         struct net_device *dev = ieee->dev;
 334         struct ieee80211_hdr_4addr *hdr;
 335         size_t hdrlen;
 336         u16 fc, type, stype, sc;
 337         struct net_device_stats *stats;
 338         unsigned int frag;
 339         u8 *payload;
 340         u16 ethertype;
 341 #ifdef NOT_YET
 342         struct net_device *wds = NULL;
 343         struct sk_buff *skb2 = NULL;
 344         struct net_device *wds = NULL;
 345         int frame_authorized = 0;
 346         int from_assoc_ap = 0;
 347         void *sta = NULL;
 348 #endif
 349         u8 dst[ETH_ALEN];
 350         u8 src[ETH_ALEN];
 351         struct ieee80211_crypt_data *crypt = NULL;
 352         int keyidx = 0;
 353         int can_be_decrypted = 0;
 354
 355         hdr = (struct ieee80211_hdr_4addr *)skb->data;
 356         stats = &ieee->stats;
 357
 358         if (skb->len < 10) {
 359                 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
 360                 goto rx_dropped;
 361         }
 362
 363         fc = le16_to_cpu(hdr->frame_ctl);
 364         type = WLAN_FC_GET_TYPE(fc);
 365         stype = WLAN_FC_GET_STYPE(fc);
 366         sc = le16_to_cpu(hdr->seq_ctl);
 367         frag = WLAN_GET_SEQ_FRAG(sc);
 368         hdrlen = ieee80211_get_hdrlen(fc);
 369
 370         /* Put this code here so that we avoid duplicating it in all
 371          * Rx paths. - Jean II */
 372 #ifdef CONFIG_WIRELESS_EXT
 373 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
 374         /* If spy monitoring on */
 375         if (ieee->spy_data.spy_number > 0) {
 376                 struct iw_quality wstats;
 377
 378                 wstats.updated = 0;
 379                 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
 380                         wstats.level = rx_stats->rssi;
 381                         wstats.updated |= IW_QUAL_LEVEL_UPDATED;
 382                 } else
 383                         wstats.updated |= IW_QUAL_LEVEL_INVALID;
 384
 385                 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
 386                         wstats.noise = rx_stats->noise;
 387                         wstats.updated |= IW_QUAL_NOISE_UPDATED;
 388                 } else
 389                         wstats.updated |= IW_QUAL_NOISE_INVALID;
 390
 391                 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
 392                         wstats.qual = rx_stats->signal;
 393                         wstats.updated |= IW_QUAL_QUAL_UPDATED;
 394                 } else
 395                         wstats.updated |= IW_QUAL_QUAL_INVALID;
 396
 397                 /* Update spy records */
 398                 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
 399         }
 400 #endif                          /* IW_WIRELESS_SPY */
 401 #endif                          /* CONFIG_WIRELESS_EXT */
 402
 403 #ifdef NOT_YET
 404         hostap_update_rx_stats(local->ap, hdr, rx_stats);
 405 #endif
 406
 407         if (ieee->iw_mode == IW_MODE_MONITOR) {
 408                 ieee80211_monitor_rx(ieee, skb, rx_stats);
 409                 stats->rx_packets++;
 410                 stats->rx_bytes += skb->len;
 411                 return 1;
 412         }
 413
 414         can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
 415                             is_broadcast_ether_addr(hdr->addr2)) ?
 416             ieee->host_mc_decrypt : ieee->host_decrypt;
 417
 418         if (can_be_decrypted) {
 419                 int idx = 0;
 420                 if (skb->len >= hdrlen + 3) {
 421                         /* Top two-bits of byte 3 are the key index */
 422                         idx = skb->data[hdrlen + 3] >> 6;
 423                 }
 424
 425                 /* ieee->crypt[] is WEP_KEY (4) in length.  Given that idx
 426                  * is only allowed 2-bits of storage, no value of idx can
 427                  * be provided via above code that would result in idx
 428                  * being out of range */
 429                 crypt = ieee->crypt[idx];
 430
 431 #ifdef NOT_YET
 432                 sta = NULL;
 433
 434                 /* Use station specific key to override default keys if the
 435                  * receiver address is a unicast address ("individual RA"). If
 436                  * bcrx_sta_key parameter is set, station specific key is used
 437                  * even with broad/multicast targets (this is against IEEE
 438                  * 802.11, but makes it easier to use different keys with
 439                  * stations that do not support WEP key mapping). */
 440
 441                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
 442                         (void)hostap_handle_sta_crypto(local, hdr, &crypt,
 443                                                        &sta);
 444 #endif
 445
 446                 /* allow NULL decrypt to indicate an station specific override
 447                  * for default encryption */
 448                 if (crypt && (crypt->ops == NULL ||
 449                               crypt->ops->decrypt_mpdu == NULL))
 450                         crypt = NULL;
 451
 452                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 453                         /* This seems to be triggered by some (multicast?)
 454                          * frames from other than current BSS, so just drop the
 455                          * frames silently instead of filling system log with
 456                          * these reports. */
 457                         IEEE80211_DEBUG_DROP("Decryption failed (not set)"
 458                                              " (SA=" MAC_FMT ")\n",
 459                                              MAC_ARG(hdr->addr2));
 460                         ieee->ieee_stats.rx_discards_undecryptable++;
 461                         goto rx_dropped;
 462                 }
 463         }
 464 #ifdef NOT_YET
 465         if (type != WLAN_FC_TYPE_DATA) {
 466                 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
 467                     fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
 468                     (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
 469                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 470                                "from " MAC_FMT "\n", dev->name,
 471                                MAC_ARG(hdr->addr2));
 472                         /* TODO: could inform hostapd about this so that it
 473                          * could send auth failure report */
 474                         goto rx_dropped;
 475                 }
 476
 477                 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
 478                         goto rx_dropped;
 479                 else
 480                         goto rx_exit;
 481         }
 482 #endif
 483
 484         /* Data frame - extract src/dst addresses */
 485         if (skb->len < IEEE80211_3ADDR_LEN)
 486                 goto rx_dropped;
 487
 488         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 489         case IEEE80211_FCTL_FROMDS:
 490                 memcpy(dst, hdr->addr1, ETH_ALEN);
 491                 memcpy(src, hdr->addr3, ETH_ALEN);
 492                 break;
 493         case IEEE80211_FCTL_TODS:
 494                 memcpy(dst, hdr->addr3, ETH_ALEN);
 495                 memcpy(src, hdr->addr2, ETH_ALEN);
 496                 break;
 497         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 498                 if (skb->len < IEEE80211_4ADDR_LEN)
 499                         goto rx_dropped;
 500                 memcpy(dst, hdr->addr3, ETH_ALEN);
 501                 memcpy(src, hdr->addr4, ETH_ALEN);
 502                 break;
 503         case 0:
 504                 memcpy(dst, hdr->addr1, ETH_ALEN);
 505                 memcpy(src, hdr->addr2, ETH_ALEN);
 506                 break;
 507         }
 508
 509 #ifdef NOT_YET
 510         if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
 511                 goto rx_dropped;
 512         if (wds) {
 513                 skb->dev = dev = wds;
 514                 stats = hostap_get_stats(dev);
 515         }
 516
 517         if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
 518             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 519             IEEE80211_FCTL_FROMDS && ieee->stadev
 520             && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
 521                 /* Frame from BSSID of the AP for which we are a client */
 522                 skb->dev = dev = ieee->stadev;
 523                 stats = hostap_get_stats(dev);
 524                 from_assoc_ap = 1;
 525         }
 526 #endif
 527
 528         dev->last_rx = jiffies;
 529
 530 #ifdef NOT_YET
 531         if ((ieee->iw_mode == IW_MODE_MASTER ||
 532              ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
 533                 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
 534                                              wds != NULL)) {
 535                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
 536                         frame_authorized = 0;
 537                         break;
 538                 case AP_RX_CONTINUE:
 539                         frame_authorized = 1;
 540                         break;
 541                 case AP_RX_DROP:
 542                         goto rx_dropped;
 543                 case AP_RX_EXIT:
 544                         goto rx_exit;
 545                 }
 546         }
 547 #endif
 548
 549         /* Nullfunc frames may have PS-bit set, so they must be passed to
 550          * hostap_handle_sta_rx() before being dropped here. */
 551
 552         stype &= ~IEEE80211_STYPE_QOS_DATA;
 553
 554         if (stype != IEEE80211_STYPE_DATA &&
 555             stype != IEEE80211_STYPE_DATA_CFACK &&
 556             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 557             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 558                 if (stype != IEEE80211_STYPE_NULLFUNC)
 559                         IEEE80211_DEBUG_DROP("RX: dropped data frame "
 560                                              "with no data (type=0x%02x, "
 561                                              "subtype=0x%02x, len=%d)\n",
 562                                              type, stype, skb->len);
 563                 goto rx_dropped;
 564         }
 565
 566         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 567
 568         if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
 569             (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
 570                 goto rx_dropped;
 571
 572         hdr = (struct ieee80211_hdr_4addr *)skb->data;
 573
 574         /* skb: hdr + (possibly fragmented) plaintext payload */
 575         // PR: FIXME: hostap has additional conditions in the "if" below:
 576         // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 577         if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
 578                 int flen;
 579                 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
 580                 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
 581
 582                 if (!frag_skb) {
 583                         IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
 584                                         "Rx cannot get skb from fragment "
 585                                         "cache (morefrag=%d seq=%u frag=%u)\n",
 586                                         (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 587                                         WLAN_GET_SEQ_SEQ(sc), frag);
 588                         goto rx_dropped;
 589                 }
 590
 591                 flen = skb->len;
 592                 if (frag != 0)
 593                         flen -= hdrlen;
 594
 595                 if (frag_skb->tail + flen > frag_skb->end) {
 596                         printk(KERN_WARNING "%s: host decrypted and "
 597                                "reassembled frame did not fit skb\n",
 598                                dev->name);
 599                         ieee80211_frag_cache_invalidate(ieee, hdr);
 600                         goto rx_dropped;
 601                 }
 602
 603                 if (frag == 0) {
 604                         /* copy first fragment (including full headers) into
 605                          * beginning of the fragment cache skb */
 606                         memcpy(skb_put(frag_skb, flen), skb->data, flen);
 607                 } else {
 608                         /* append frame payload to the end of the fragment
 609                          * cache skb */
 610                         memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
 611                                flen);
 612                 }
 613                 dev_kfree_skb_any(skb);
 614                 skb = NULL;
 615
 616                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
 617                         /* more fragments expected - leave the skb in fragment
 618                          * cache for now; it will be delivered to upper layers
 619                          * after all fragments have been received */
 620                         goto rx_exit;
 621                 }
 622
 623                 /* this was the last fragment and the frame will be
 624                  * delivered, so remove skb from fragment cache */
 625                 skb = frag_skb;
 626                 hdr = (struct ieee80211_hdr_4addr *)skb->data;
 627                 ieee80211_frag_cache_invalidate(ieee, hdr);
 628         }
 629
 630         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 631          * encrypted/authenticated */
 632         if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
 633             ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
 634                 goto rx_dropped;
 635
 636         hdr = (struct ieee80211_hdr_4addr *)skb->data;
 637         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
 638                 if (            /*ieee->ieee802_1x && */
 639                            ieee80211_is_eapol_frame(ieee, skb)) {
 640                         /* pass unencrypted EAPOL frames even if encryption is
 641                          * configured */
 642                 } else {
 643                         IEEE80211_DEBUG_DROP("encryption configured, but RX "
 644                                              "frame not encrypted (SA=" MAC_FMT
 645                                              ")\n", MAC_ARG(hdr->addr2));
 646                         goto rx_dropped;
 647                 }
 648         }
 649
 650         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
 651             !ieee80211_is_eapol_frame(ieee, skb)) {
 652                 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
 653                                      "frame from " MAC_FMT
 654                                      " (drop_unencrypted=1)\n",
 655                                      MAC_ARG(hdr->addr2));
 656                 goto rx_dropped;
 657         }
 658
 659         /* skb: hdr + (possible reassembled) full plaintext payload */
 660
 661         payload = skb->data + hdrlen;
 662         ethertype = (payload[6] << 8) | payload[7];
 663
 664 #ifdef NOT_YET
 665         /* If IEEE 802.1X is used, check whether the port is authorized to send
 666          * the received frame. */
 667         if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
 668                 if (ethertype == ETH_P_PAE) {
 669                         printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
 670                                dev->name);
 671                         if (ieee->hostapd && ieee->apdev) {
 672                                 /* Send IEEE 802.1X frames to the user
 673                                  * space daemon for processing */
 674                                 prism2_rx_80211(ieee->apdev, skb, rx_stats,
 675                                                 PRISM2_RX_MGMT);
 676                                 ieee->apdevstats.rx_packets++;
 677                                 ieee->apdevstats.rx_bytes += skb->len;
 678                                 goto rx_exit;
 679                         }
 680                 } else if (!frame_authorized) {
 681                         printk(KERN_DEBUG "%s: dropped frame from "
 682                                "unauthorized port (IEEE 802.1X): "
 683                                "ethertype=0x%04x\n", dev->name, ethertype);
 684                         goto rx_dropped;
 685                 }
 686         }
 687 #endif
 688
 689         /* convert hdr + possible LLC headers into Ethernet header */
 690         if (skb->len - hdrlen >= 8 &&
 691             ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
 692               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 693              memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
 694                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 695                  * replace EtherType */
 696                 skb_pull(skb, hdrlen + SNAP_SIZE);
 697                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 698                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 699         } else {
 700                 u16 len;
 701                 /* Leave Ethernet header part of hdr and full payload */
 702                 skb_pull(skb, hdrlen);
 703                 len = htons(skb->len);
 704                 memcpy(skb_push(skb, 2), &len, 2);
 705                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 706                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 707         }
 708
 709 #ifdef NOT_YET
 710         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 711                     IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
 712                 /* Non-standard frame: get addr4 from its bogus location after
 713                  * the payload */
 714                 memcpy(skb->data + ETH_ALEN,
 715                        skb->data + skb->len - ETH_ALEN, ETH_ALEN);
 716                 skb_trim(skb, skb->len - ETH_ALEN);
 717         }
 718 #endif
 719
 720         stats->rx_packets++;
 721         stats->rx_bytes += skb->len;
 722
 723 #ifdef NOT_YET
 724         if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
 725                 if (dst[0] & 0x01) {
 726                         /* copy multicast frame both to the higher layers and
 727                          * to the wireless media */
 728                         ieee->ap->bridged_multicast++;
 729                         skb2 = skb_clone(skb, GFP_ATOMIC);
 730                         if (skb2 == NULL)
 731                                 printk(KERN_DEBUG "%s: skb_clone failed for "
 732                                        "multicast frame\n", dev->name);
 733                 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
 734                         /* send frame directly to the associated STA using
 735                          * wireless media and not passing to higher layers */
 736                         ieee->ap->bridged_unicast++;
 737                         skb2 = skb;
 738                         skb = NULL;
 739                 }
 740         }
 741
 742         if (skb2 != NULL) {
 743                 /* send to wireless media */
 744                 skb2->protocol = __constant_htons(ETH_P_802_3);
 745                 skb2->mac.raw = skb2->nh.raw = skb2->data;
 746                 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
 747                 skb2->dev = dev;
 748                 dev_queue_xmit(skb2);
 749         }
 750 #endif
 751
 752         if (skb) {
 753                 skb->protocol = eth_type_trans(skb, dev);
 754                 memset(skb->cb, 0, sizeof(skb->cb));
 755                 skb->dev = dev;
 756                 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
 757                 if (netif_rx(skb) == NET_RX_DROP) {
 758                         /* netif_rx always succeeds, but it might drop
 759                          * the packet.  If it drops the packet, we log that
 760                          * in our stats. */
 761                         IEEE80211_DEBUG_DROP
 762                             ("RX: netif_rx dropped the packet\n");
 763                         stats->rx_dropped++;
 764                 }
 765         }
 766
 767       rx_exit:
 768 #ifdef NOT_YET
 769         if (sta)
 770                 hostap_handle_sta_release(sta);
 771 #endif
 772         return 1;
 773
 774       rx_dropped:
 775         stats->rx_dropped++;
 776
 777         /* Returning 0 indicates to caller that we have not handled the SKB--
 778          * so it is still allocated and can be used again by underlying
 779          * hardware as a DMA target */
 780         return 0;
 781 }
 782
 783 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
 784
 785 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
 786
 787 /*
 788 * Make ther structure we read from the beacon packet has
 789 * the right values
 790 */
 791 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
 792                                      *info_element, int sub_type)
 793 {
 794
 795         if (info_element->qui_subtype != sub_type)
 796                 return -1;
 797         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
 798                 return -1;
 799         if (info_element->qui_type != QOS_OUI_TYPE)
 800                 return -1;
 801         if (info_element->version != QOS_VERSION_1)
 802                 return -1;
 803
 804         return 0;
 805 }
 806
 807 /*
 808  * Parse a QoS parameter element
 809  */
 810 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
 811                                             *element_param, struct ieee80211_info_element
 812                                             *info_element)
 813 {
 814         int ret = 0;
 815         u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
 816
 817         if ((info_element == NULL) || (element_param == NULL))
 818                 return -1;
 819
 820         if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
 821                 memcpy(element_param->info_element.qui, info_element->data,
 822                        info_element->len);
 823                 element_param->info_element.elementID = info_element->id;
 824                 element_param->info_element.length = info_element->len;
 825         } else
 826                 ret = -1;
 827         if (ret == 0)
 828                 ret = ieee80211_verify_qos_info(&element_param->info_element,
 829                                                 QOS_OUI_PARAM_SUB_TYPE);
 830         return ret;
 831 }
 832
 833 /*
 834  * Parse a QoS information element
 835  */
 836 static int ieee80211_read_qos_info_element(struct
 837                                            ieee80211_qos_information_element
 838                                            *element_info, struct ieee80211_info_element
 839                                            *info_element)
 840 {
 841         int ret = 0;
 842         u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
 843
 844         if (element_info == NULL)
 845                 return -1;
 846         if (info_element == NULL)
 847                 return -1;
 848
 849         if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
 850                 memcpy(element_info->qui, info_element->data,
 851                        info_element->len);
 852                 element_info->elementID = info_element->id;
 853                 element_info->length = info_element->len;
 854         } else
 855                 ret = -1;
 856
 857         if (ret == 0)
 858                 ret = ieee80211_verify_qos_info(element_info,
 859                                                 QOS_OUI_INFO_SUB_TYPE);
 860         return ret;
 861 }
 862
 863 /*
 864  * Write QoS parameters from the ac parameters.
 865  */
 866 static int ieee80211_qos_convert_ac_to_parameters(struct
 867                                                   ieee80211_qos_parameter_info
 868                                                   *param_elm, struct
 869                                                   ieee80211_qos_parameters
 870                                                   *qos_param)
 871 {
 872         int rc = 0;
 873         int i;
 874         struct ieee80211_qos_ac_parameter *ac_params;
 875         u32 txop;
 876         u8 cw_min;
 877         u8 cw_max;
 878
 879         for (i = 0; i < QOS_QUEUE_NUM; i++) {
 880                 ac_params = &(param_elm->ac_params_record[i]);
 881
 882                 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
 883                 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
 884
 885                 cw_min = ac_params->ecw_min_max & 0x0F;
 886                 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
 887
 888                 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
 889                 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
 890
 891                 qos_param->flag[i] =
 892                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
 893
 894                 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
 895                 qos_param->tx_op_limit[i] = (u16) txop;
 896         }
 897         return rc;
 898 }
 899
 900 /*
 901  * we have a generic data element which it may contain QoS information or
 902  * parameters element. check the information element length to decide
 903  * which type to read
 904  */
 905 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
 906                                              *info_element,
 907                                              struct ieee80211_network *network)
 908 {
 909         int rc = 0;
 910         struct ieee80211_qos_parameters *qos_param = NULL;
 911         struct ieee80211_qos_information_element qos_info_element;
 912
 913         rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
 914
 915         if (rc == 0) {
 916                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
 917                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
 918         } else {
 919                 struct ieee80211_qos_parameter_info param_element;
 920
 921                 rc = ieee80211_read_qos_param_element(&param_element,
 922                                                       info_element);
 923                 if (rc == 0) {
 924                         qos_param = &(network->qos_data.parameters);
 925                         ieee80211_qos_convert_ac_to_parameters(&param_element,
 926                                                                qos_param);
 927                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
 928                         network->qos_data.param_count =
 929                             param_element.info_element.ac_info & 0x0F;
 930                 }
 931         }
 932
 933         if (rc == 0) {
 934                 IEEE80211_DEBUG_QOS("QoS is supported\n");
 935                 network->qos_data.supported = 1;
 936         }
 937         return rc;
 938 }
 939
 940 #ifdef CONFIG_IEEE80211_DEBUG
 941 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
 942
 943 static const char *get_info_element_string(u16 id)
 944 {
 945         switch (id) {
 946                 MFIE_STRING(SSID);
 947                 MFIE_STRING(RATES);
 948                 MFIE_STRING(FH_SET);
 949                 MFIE_STRING(DS_SET);
 950                 MFIE_STRING(CF_SET);
 951                 MFIE_STRING(TIM);
 952                 MFIE_STRING(IBSS_SET);
 953                 MFIE_STRING(COUNTRY);
 954                 MFIE_STRING(HOP_PARAMS);
 955                 MFIE_STRING(HOP_TABLE);
 956                 MFIE_STRING(REQUEST);
 957                 MFIE_STRING(CHALLENGE);
 958                 MFIE_STRING(POWER_CONSTRAINT);
 959                 MFIE_STRING(POWER_CAPABILITY);
 960                 MFIE_STRING(TPC_REQUEST);
 961                 MFIE_STRING(TPC_REPORT);
 962                 MFIE_STRING(SUPP_CHANNELS);
 963                 MFIE_STRING(CSA);
 964                 MFIE_STRING(MEASURE_REQUEST);
 965                 MFIE_STRING(MEASURE_REPORT);
 966                 MFIE_STRING(QUIET);
 967                 MFIE_STRING(IBSS_DFS);
 968                 MFIE_STRING(ERP_INFO);
 969                 MFIE_STRING(RSN);
 970                 MFIE_STRING(RATES_EX);
 971                 MFIE_STRING(GENERIC);
 972                 MFIE_STRING(QOS_PARAMETER);
 973         default:
 974                 return "UNKNOWN";
 975         }
 976 }
 977 #endif
 978
 979 static int ieee80211_parse_info_param(struct ieee80211_info_element
 980                                       *info_element, u16 length,
 981                                       struct ieee80211_network *network)
 982 {
 983         u8 i;
 984 #ifdef CONFIG_IEEE80211_DEBUG
 985         char rates_str[64];
 986         char *p;
 987 #endif
 988
 989         while (length >= sizeof(*info_element)) {
 990                 if (sizeof(*info_element) + info_element->len > length) {
 991                         IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
 992                                              "info_element->len + 2 > left : "
 993                                              "info_element->len+2=%zd left=%d, id=%d.\n",
 994                                              info_element->len +
 995                                              sizeof(*info_element),
 996                                              length, info_element->id);
 997                         return 1;
 998                 }
 999
1000                 switch (info_element->id) {
1001                 case MFIE_TYPE_SSID:
1002                         if (ieee80211_is_empty_essid(info_element->data,
1003                                                      info_element->len)) {
1004                                 network->flags |= NETWORK_EMPTY_ESSID;
1005                                 break;
1006                         }
1007
1008                         network->ssid_len = min(info_element->len,
1009                                                 (u8) IW_ESSID_MAX_SIZE);
1010                         memcpy(network->ssid, info_element->data,
1011                                network->ssid_len);
1012                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
1013                                 memset(network->ssid + network->ssid_len, 0,
1014                                        IW_ESSID_MAX_SIZE - network->ssid_len);
1015
1016                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1017                                              network->ssid, network->ssid_len);
1018                         break;
1019
1020                 case MFIE_TYPE_RATES:
1021 #ifdef CONFIG_IEEE80211_DEBUG
1022                         p = rates_str;
1023 #endif
1024                         network->rates_len = min(info_element->len,
1025                                                  MAX_RATES_LENGTH);
1026                         for (i = 0; i < network->rates_len; i++) {
1027                                 network->rates[i] = info_element->data[i];
1028 #ifdef CONFIG_IEEE80211_DEBUG
1029                                 p += snprintf(p, sizeof(rates_str) -
1030                                               (p - rates_str), "%02X ",
1031                                               network->rates[i]);
1032 #endif
1033                                 if (ieee80211_is_ofdm_rate
1034                                     (info_element->data[i])) {
1035                                         network->flags |= NETWORK_HAS_OFDM;
1036                                         if (info_element->data[i] &
1037                                             IEEE80211_BASIC_RATE_MASK)
1038                                                 network->flags &=
1039                                                     ~NETWORK_HAS_CCK;
1040                                 }
1041                         }
1042
1043                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1044                                              rates_str, network->rates_len);
1045                         break;
1046
1047                 case MFIE_TYPE_RATES_EX:
1048 #ifdef CONFIG_IEEE80211_DEBUG
1049                         p = rates_str;
1050 #endif
1051                         network->rates_ex_len = min(info_element->len,
1052                                                     MAX_RATES_EX_LENGTH);
1053                         for (i = 0; i < network->rates_ex_len; i++) {
1054                                 network->rates_ex[i] = info_element->data[i];
1055 #ifdef CONFIG_IEEE80211_DEBUG
1056                                 p += snprintf(p, sizeof(rates_str) -
1057                                               (p - rates_str), "%02X ",
1058                                               network->rates[i]);
1059 #endif
1060                                 if (ieee80211_is_ofdm_rate
1061                                     (info_element->data[i])) {
1062                                         network->flags |= NETWORK_HAS_OFDM;
1063                                         if (info_element->data[i] &
1064                                             IEEE80211_BASIC_RATE_MASK)
1065                                                 network->flags &=
1066                                                     ~NETWORK_HAS_CCK;
1067                                 }
1068                         }
1069
1070                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1071                                              rates_str, network->rates_ex_len);
1072                         break;
1073
1074                 case MFIE_TYPE_DS_SET:
1075                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1076                                              info_element->data[0]);
1077                         network->channel = info_element->data[0];
1078                         break;
1079
1080                 case MFIE_TYPE_FH_SET:
1081                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1082                         break;
1083
1084                 case MFIE_TYPE_CF_SET:
1085                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1086                         break;
1087
1088                 case MFIE_TYPE_TIM:
1089                         network->tim.tim_count = info_element->data[0];
1090                         network->tim.tim_period = info_element->data[1];
1091                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1092                         break;
1093
1094                 case MFIE_TYPE_ERP_INFO:
1095                         network->erp_value = info_element->data[0];
1096                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1097                                              network->erp_value);
1098                         break;
1099
1100                 case MFIE_TYPE_IBSS_SET:
1101                         network->atim_window = info_element->data[0];
1102                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1103                                              network->atim_window);
1104                         break;
1105
1106                 case MFIE_TYPE_CHALLENGE:
1107                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1108                         break;
1109
1110                 case MFIE_TYPE_GENERIC:
1111                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1112                                              info_element->len);
1113                         if (!ieee80211_parse_qos_info_param_IE(info_element,
1114                                                                network))
1115                                 break;
1116
1117                         if (info_element->len >= 4 &&
1118                             info_element->data[0] == 0x00 &&
1119                             info_element->data[1] == 0x50 &&
1120                             info_element->data[2] == 0xf2 &&
1121                             info_element->data[3] == 0x01) {
1122                                 network->wpa_ie_len = min(info_element->len + 2,
1123                                                           MAX_WPA_IE_LEN);
1124                                 memcpy(network->wpa_ie, info_element,
1125                                        network->wpa_ie_len);
1126                         }
1127                         break;
1128
1129                 case MFIE_TYPE_RSN:
1130                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1131                                              info_element->len);
1132                         network->rsn_ie_len = min(info_element->len + 2,
1133                                                   MAX_WPA_IE_LEN);
1134                         memcpy(network->rsn_ie, info_element,
1135                                network->rsn_ie_len);
1136                         break;
1137
1138                 case MFIE_TYPE_QOS_PARAMETER:
1139                         printk(KERN_ERR
1140                                "QoS Error need to parse QOS_PARAMETER IE\n");
1141                         break;
1142                         /* 802.11h */
1143                 case MFIE_TYPE_POWER_CONSTRAINT:
1144                         network->power_constraint = info_element->data[0];
1145                         network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1146                         break;
1147
1148                 case MFIE_TYPE_CSA:
1149                         network->power_constraint = info_element->data[0];
1150                         network->flags |= NETWORK_HAS_CSA;
1151                         break;
1152
1153                 case MFIE_TYPE_QUIET:
1154                         network->quiet.count = info_element->data[0];
1155                         network->quiet.period = info_element->data[1];
1156                         network->quiet.duration = info_element->data[2];
1157                         network->quiet.offset = info_element->data[3];
1158                         network->flags |= NETWORK_HAS_QUIET;
1159                         break;
1160
1161                 case MFIE_TYPE_IBSS_DFS:
1162                         if (network->ibss_dfs)
1163                                 break;
1164                         network->ibss_dfs =
1165                             kmalloc(info_element->len, GFP_ATOMIC);
1166                         if (!network->ibss_dfs)
1167                                 return 1;
1168                         memcpy(network->ibss_dfs, info_element->data,
1169                                info_element->len);
1170                         network->flags |= NETWORK_HAS_IBSS_DFS;
1171                         break;
1172
1173                 case MFIE_TYPE_TPC_REPORT:
1174                         network->tpc_report.transmit_power =
1175                             info_element->data[0];
1176                         network->tpc_report.link_margin = info_element->data[1];
1177                         network->flags |= NETWORK_HAS_TPC_REPORT;
1178                         break;
1179
1180                 default:
1181                         IEEE80211_DEBUG_MGMT
1182                             ("Unsupported info element: %s (%d)\n",
1183                              get_info_element_string(info_element->id),
1184                              info_element->id);
1185                         break;
1186                 }
1187
1188                 length -= sizeof(*info_element) + info_element->len;
1189                 info_element =
1190                     (struct ieee80211_info_element *)&info_element->
1191                     data[info_element->len];
1192         }
1193
1194         return 0;
1195 }
1196
1197 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1198                                        *frame, struct ieee80211_rx_stats *stats)
1199 {
1200         struct ieee80211_network network_resp = {
1201                 .ibss_dfs = NULL,
1202         };
1203         struct ieee80211_network *network = &network_resp;
1204         struct net_device *dev = ieee->dev;
1205
1206         network->flags = 0;
1207         network->qos_data.active = 0;
1208         network->qos_data.supported = 0;
1209         network->qos_data.param_count = 0;
1210         network->qos_data.old_param_count = 0;
1211
1212         //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1213         network->atim_window = le16_to_cpu(frame->aid);
1214         network->listen_interval = le16_to_cpu(frame->status);
1215         memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1216         network->capability = le16_to_cpu(frame->capability);
1217         network->last_scanned = jiffies;
1218         network->rates_len = network->rates_ex_len = 0;
1219         network->last_associate = 0;
1220         network->ssid_len = 0;
1221         network->erp_value =
1222             (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1223
1224         if (stats->freq == IEEE80211_52GHZ_BAND) {
1225                 /* for A band (No DS info) */
1226                 network->channel = stats->received_channel;
1227         } else
1228                 network->flags |= NETWORK_HAS_CCK;
1229
1230         network->wpa_ie_len = 0;
1231         network->rsn_ie_len = 0;
1232
1233         if (ieee80211_parse_info_param
1234             (frame->info_element, stats->len - sizeof(*frame), network))
1235                 return 1;
1236
1237         network->mode = 0;
1238         if (stats->freq == IEEE80211_52GHZ_BAND)
1239                 network->mode = IEEE_A;
1240         else {
1241                 if (network->flags & NETWORK_HAS_OFDM)
1242                         network->mode |= IEEE_G;
1243                 if (network->flags & NETWORK_HAS_CCK)
1244                         network->mode |= IEEE_B;
1245         }
1246
1247         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1248                 network->flags |= NETWORK_EMPTY_ESSID;
1249
1250         memcpy(&network->stats, stats, sizeof(network->stats));
1251
1252         if (ieee->handle_assoc_response != NULL)
1253                 ieee->handle_assoc_response(dev, frame, network);
1254
1255         return 0;
1256 }
1257
1258 /***************************************************/
1259
1260 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1261                                          *beacon,
1262                                          struct ieee80211_network *network,
1263                                          struct ieee80211_rx_stats *stats)
1264 {
1265         network->qos_data.active = 0;
1266         network->qos_data.supported = 0;
1267         network->qos_data.param_count = 0;
1268         network->qos_data.old_param_count = 0;
1269
1270         /* Pull out fixed field data */
1271         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1272         network->capability = le16_to_cpu(beacon->capability);
1273         network->last_scanned = jiffies;
1274         network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1275         network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1276         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1277         /* Where to pull this? beacon->listen_interval; */
1278         network->listen_interval = 0x0A;
1279         network->rates_len = network->rates_ex_len = 0;
1280         network->last_associate = 0;
1281         network->ssid_len = 0;
1282         network->flags = 0;
1283         network->atim_window = 0;
1284         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1285             0x3 : 0x0;
1286
1287         if (stats->freq == IEEE80211_52GHZ_BAND) {
1288                 /* for A band (No DS info) */
1289                 network->channel = stats->received_channel;
1290         } else
1291                 network->flags |= NETWORK_HAS_CCK;
1292
1293         network->wpa_ie_len = 0;
1294         network->rsn_ie_len = 0;
1295
1296         if (ieee80211_parse_info_param
1297             (beacon->info_element, stats->len - sizeof(*beacon), network))
1298                 return 1;
1299
1300         network->mode = 0;
1301         if (stats->freq == IEEE80211_52GHZ_BAND)
1302                 network->mode = IEEE_A;
1303         else {
1304                 if (network->flags & NETWORK_HAS_OFDM)
1305                         network->mode |= IEEE_G;
1306                 if (network->flags & NETWORK_HAS_CCK)
1307                         network->mode |= IEEE_B;
1308         }
1309
1310         if (network->mode == 0) {
1311                 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1312                                      "network.\n",
1313                                      escape_essid(network->ssid,
1314                                                   network->ssid_len),
1315                                      MAC_ARG(network->bssid));
1316                 return 1;
1317         }
1318
1319         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1320                 network->flags |= NETWORK_EMPTY_ESSID;
1321
1322         memcpy(&network->stats, stats, sizeof(network->stats));
1323
1324         return 0;
1325 }
1326
1327 static inline int is_same_network(struct ieee80211_network *src,
1328                                   struct ieee80211_network *dst)
1329 {
1330         /* A network is only a duplicate if the channel, BSSID, and ESSID
1331          * all match.  We treat all <hidden> with the same BSSID and channel
1332          * as one network */
1333         return ((src->ssid_len == dst->ssid_len) &&
1334                 (src->channel == dst->channel) &&
1335                 !compare_ether_addr(src->bssid, dst->bssid) &&
1336                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1337 }
1338
1339 static void update_network(struct ieee80211_network *dst,
1340                                   struct ieee80211_network *src)
1341 {
1342         int qos_active;
1343         u8 old_param;
1344
1345         ieee80211_network_reset(dst);
1346         dst->ibss_dfs = src->ibss_dfs;
1347
1348         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1349         dst->capability = src->capability;
1350         memcpy(dst->rates, src->rates, src->rates_len);
1351         dst->rates_len = src->rates_len;
1352         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1353         dst->rates_ex_len = src->rates_ex_len;
1354
1355         dst->mode = src->mode;
1356         dst->flags = src->flags;
1357         dst->time_stamp[0] = src->time_stamp[0];
1358         dst->time_stamp[1] = src->time_stamp[1];
1359
1360         dst->beacon_interval = src->beacon_interval;
1361         dst->listen_interval = src->listen_interval;
1362         dst->atim_window = src->atim_window;
1363         dst->erp_value = src->erp_value;
1364         dst->tim = src->tim;
1365
1366         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1367         dst->wpa_ie_len = src->wpa_ie_len;
1368         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1369         dst->rsn_ie_len = src->rsn_ie_len;
1370
1371         dst->last_scanned = jiffies;
1372         qos_active = src->qos_data.active;
1373         old_param = dst->qos_data.old_param_count;
1374         if (dst->flags & NETWORK_HAS_QOS_MASK)
1375                 memcpy(&dst->qos_data, &src->qos_data,
1376                        sizeof(struct ieee80211_qos_data));
1377         else {
1378                 dst->qos_data.supported = src->qos_data.supported;
1379                 dst->qos_data.param_count = src->qos_data.param_count;
1380         }
1381
1382         if (dst->qos_data.supported == 1) {
1383                 if (dst->ssid_len)
1384                         IEEE80211_DEBUG_QOS
1385                             ("QoS the network %s is QoS supported\n",
1386                              dst->ssid);
1387                 else
1388                         IEEE80211_DEBUG_QOS
1389                             ("QoS the network is QoS supported\n");
1390         }
1391         dst->qos_data.active = qos_active;
1392         dst->qos_data.old_param_count = old_param;
1393
1394         /* dst->last_associate is not overwritten */
1395 }
1396
1397 static inline int is_beacon(__le16 fc)
1398 {
1399         return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1400 }
1401
1402 static void ieee80211_process_probe_response(struct ieee80211_device
1403                                                     *ieee, struct
1404                                                     ieee80211_probe_response
1405                                                     *beacon, struct ieee80211_rx_stats
1406                                                     *stats)
1407 {
1408         struct net_device *dev = ieee->dev;
1409         struct ieee80211_network network = {
1410                 .ibss_dfs = NULL,
1411         };
1412         struct ieee80211_network *target;
1413         struct ieee80211_network *oldest = NULL;
1414 #ifdef CONFIG_IEEE80211_DEBUG
1415         struct ieee80211_info_element *info_element = beacon->info_element;
1416 #endif
1417         unsigned long flags;
1418
1419         IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1420                              "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1421                              escape_essid(info_element->data,
1422                                           info_element->len),
1423                              MAC_ARG(beacon->header.addr3),
1424                              (beacon->capability & (1 << 0xf)) ? '1' : '0',
1425                              (beacon->capability & (1 << 0xe)) ? '1' : '0',
1426                              (beacon->capability & (1 << 0xd)) ? '1' : '0',
1427                              (beacon->capability & (1 << 0xc)) ? '1' : '0',
1428                              (beacon->capability & (1 << 0xb)) ? '1' : '0',
1429                              (beacon->capability & (1 << 0xa)) ? '1' : '0',
1430                              (beacon->capability & (1 << 0x9)) ? '1' : '0',
1431                              (beacon->capability & (1 << 0x8)) ? '1' : '0',
1432                              (beacon->capability & (1 << 0x7)) ? '1' : '0',
1433                              (beacon->capability & (1 << 0x6)) ? '1' : '0',
1434                              (beacon->capability & (1 << 0x5)) ? '1' : '0',
1435                              (beacon->capability & (1 << 0x4)) ? '1' : '0',
1436                              (beacon->capability & (1 << 0x3)) ? '1' : '0',
1437                              (beacon->capability & (1 << 0x2)) ? '1' : '0',
1438                              (beacon->capability & (1 << 0x1)) ? '1' : '0',
1439                              (beacon->capability & (1 << 0x0)) ? '1' : '0');
1440
1441         if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1442                 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1443                                      escape_essid(info_element->data,
1444                                                   info_element->len),
1445                                      MAC_ARG(beacon->header.addr3),
1446                                      is_beacon(beacon->header.frame_ctl) ?
1447                                      "BEACON" : "PROBE RESPONSE");
1448                 return;
1449         }
1450
1451         /* The network parsed correctly -- so now we scan our known networks
1452          * to see if we can find it in our list.
1453          *
1454          * NOTE:  This search is definitely not optimized.  Once its doing
1455          *        the "right thing" we'll optimize it for efficiency if
1456          *        necessary */
1457
1458         /* Search for this entry in the list and update it if it is
1459          * already there. */
1460
1461         spin_lock_irqsave(&ieee->lock, flags);
1462
1463         list_for_each_entry(target, &ieee->network_list, list) {
1464                 if (is_same_network(target, &network))
1465                         break;
1466
1467                 if ((oldest == NULL) ||
1468                     (target->last_scanned < oldest->last_scanned))
1469                         oldest = target;
1470         }
1471
1472         /* If we didn't find a match, then get a new network slot to initialize
1473          * with this beacon's information */
1474         if (&target->list == &ieee->network_list) {
1475                 if (list_empty(&ieee->network_free_list)) {
1476                         /* If there are no more slots, expire the oldest */
1477                         list_del(&oldest->list);
1478                         target = oldest;
1479                         IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1480                                              "network list.\n",
1481                                              escape_essid(target->ssid,
1482                                                           target->ssid_len),
1483                                              MAC_ARG(target->bssid));
1484                         ieee80211_network_reset(target);
1485                 } else {
1486                         /* Otherwise just pull from the free list */
1487                         target = list_entry(ieee->network_free_list.next,
1488                                             struct ieee80211_network, list);
1489                         list_del(ieee->network_free_list.next);
1490                 }
1491
1492 #ifdef CONFIG_IEEE80211_DEBUG
1493                 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1494                                      escape_essid(network.ssid,
1495                                                   network.ssid_len),
1496                                      MAC_ARG(network.bssid),
1497                                      is_beacon(beacon->header.frame_ctl) ?
1498                                      "BEACON" : "PROBE RESPONSE");
1499 #endif
1500                 memcpy(target, &network, sizeof(*target));
1501                 network.ibss_dfs = NULL;
1502                 list_add_tail(&target->list, &ieee->network_list);
1503         } else {
1504                 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1505                                      escape_essid(target->ssid,
1506                                                   target->ssid_len),
1507                                      MAC_ARG(target->bssid),
1508                                      is_beacon(beacon->header.frame_ctl) ?
1509                                      "BEACON" : "PROBE RESPONSE");
1510                 update_network(target, &network);
1511                 network.ibss_dfs = NULL;
1512         }
1513
1514         spin_unlock_irqrestore(&ieee->lock, flags);
1515
1516         if (is_beacon(beacon->header.frame_ctl)) {
1517                 if (ieee->handle_beacon != NULL)
1518                         ieee->handle_beacon(dev, beacon, target);
1519         } else {
1520                 if (ieee->handle_probe_response != NULL)
1521                         ieee->handle_probe_response(dev, beacon, target);
1522         }
1523 }
1524
1525 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1526                       struct ieee80211_hdr_4addr *header,
1527                       struct ieee80211_rx_stats *stats)
1528 {
1529         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1530         case IEEE80211_STYPE_ASSOC_RESP:
1531                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1532                                      WLAN_FC_GET_STYPE(le16_to_cpu
1533                                                        (header->frame_ctl)));
1534                 ieee80211_handle_assoc_resp(ieee,
1535                                             (struct ieee80211_assoc_response *)
1536                                             header, stats);
1537                 break;
1538
1539         case IEEE80211_STYPE_REASSOC_RESP:
1540                 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1541                                      WLAN_FC_GET_STYPE(le16_to_cpu
1542                                                        (header->frame_ctl)));
1543                 break;
1544
1545         case IEEE80211_STYPE_PROBE_REQ:
1546                 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1547                                      WLAN_FC_GET_STYPE(le16_to_cpu
1548                                                        (header->frame_ctl)));
1549
1550                 if (ieee->handle_probe_request != NULL)
1551                         ieee->handle_probe_request(ieee->dev,
1552                                                    (struct
1553                                                     ieee80211_probe_request *)
1554                                                    header, stats);
1555                 break;
1556
1557         case IEEE80211_STYPE_PROBE_RESP:
1558                 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1559                                      WLAN_FC_GET_STYPE(le16_to_cpu
1560                                                        (header->frame_ctl)));
1561                 IEEE80211_DEBUG_SCAN("Probe response\n");
1562                 ieee80211_process_probe_response(ieee,
1563                                                  (struct
1564                                                   ieee80211_probe_response *)
1565                                                  header, stats);
1566                 break;
1567
1568         case IEEE80211_STYPE_BEACON:
1569                 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1570                                      WLAN_FC_GET_STYPE(le16_to_cpu
1571                                                        (header->frame_ctl)));
1572                 IEEE80211_DEBUG_SCAN("Beacon\n");
1573                 ieee80211_process_probe_response(ieee,
1574                                                  (struct
1575                                                   ieee80211_probe_response *)
1576                                                  header, stats);
1577                 break;
1578         case IEEE80211_STYPE_AUTH:
1579
1580                 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1581                                      WLAN_FC_GET_STYPE(le16_to_cpu
1582                                                        (header->frame_ctl)));
1583
1584                 if (ieee->handle_auth != NULL)
1585                         ieee->handle_auth(ieee->dev,
1586                                           (struct ieee80211_auth *)header);
1587                 break;
1588
1589         case IEEE80211_STYPE_DISASSOC:
1590                 if (ieee->handle_disassoc != NULL)
1591                         ieee->handle_disassoc(ieee->dev,
1592                                               (struct ieee80211_disassoc *)
1593                                               header);
1594                 break;
1595
1596         case IEEE80211_STYPE_ACTION:
1597                 IEEE80211_DEBUG_MGMT("ACTION\n");
1598                 if (ieee->handle_action)
1599                         ieee->handle_action(ieee->dev,
1600                                             (struct ieee80211_action *)
1601                                             header, stats);
1602                 break;
1603
1604         case IEEE80211_STYPE_REASSOC_REQ:
1605                 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1606                                      WLAN_FC_GET_STYPE(le16_to_cpu
1607                                                        (header->frame_ctl)));
1608
1609                 IEEE80211_WARNING("%s: IEEE80211_REASSOC_REQ received\n",
1610                                   ieee->dev->name);
1611                 if (ieee->handle_reassoc_request != NULL)
1612                         ieee->handle_reassoc_request(ieee->dev,
1613                                                     (struct ieee80211_reassoc_request *)
1614                                                      header);
1615                 break;
1616
1617         case IEEE80211_STYPE_ASSOC_REQ:
1618                 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1619                                      WLAN_FC_GET_STYPE(le16_to_cpu
1620                                                        (header->frame_ctl)));
1621
1622                 IEEE80211_WARNING("%s: IEEE80211_ASSOC_REQ received\n",
1623                                   ieee->dev->name);
1624                 if (ieee->handle_assoc_request != NULL)
1625                         ieee->handle_assoc_request(ieee->dev);
1626                 break;
1627
1628         case IEEE80211_STYPE_DEAUTH:
1629                 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1630                 if (ieee->handle_deauth != NULL)
1631                         ieee->handle_deauth(ieee->dev,
1632                                             (struct ieee80211_deauth *)
1633                                             header);
1634                 break;
1635         default:
1636                 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1637                                      WLAN_FC_GET_STYPE(le16_to_cpu
1638                                                        (header->frame_ctl)));
1639                 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1640                                   ieee->dev->name,
1641                                   WLAN_FC_GET_STYPE(le16_to_cpu
1642                                                     (header->frame_ctl)));
1643                 break;
1644         }
1645 }
1646
1647 EXPORT_SYMBOL(ieee80211_rx_mgt);
1648 EXPORT_SYMBOL(ieee80211_rx);