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