SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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, 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         /* If spy monitoring on */
 374         if (ieee->spy_data.spy_number > 0) {
 375                 struct iw_quality wstats;
 376
 377                 wstats.updated = 0;
 378                 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
 379                         wstats.level = rx_stats->rssi;
 380                         wstats.updated |= IW_QUAL_LEVEL_UPDATED;
 381                 } else
 382                         wstats.updated |= IW_QUAL_LEVEL_INVALID;
 383
 384                 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
 385                         wstats.noise = rx_stats->noise;
 386                         wstats.updated |= IW_QUAL_NOISE_UPDATED;
 387                 } else
 388                         wstats.updated |= IW_QUAL_NOISE_INVALID;
 389
 390                 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
 391                         wstats.qual = rx_stats->signal;
 392                         wstats.updated |= IW_QUAL_QUAL_UPDATED;
 393                 } else
 394                         wstats.updated |= IW_QUAL_QUAL_INVALID;
 395
 396                 /* Update spy records */
 397                 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
 398         }
 399 #endif                          /* IW_WIRELESS_SPY */
 400
 401 #ifdef NOT_YET
 402         hostap_update_rx_stats(local->ap, hdr, rx_stats);
 403 #endif
 404
 405         if (ieee->iw_mode == IW_MODE_MONITOR) {
 406                 ieee80211_monitor_rx(ieee, skb, rx_stats);
 407                 stats->rx_packets++;
 408                 stats->rx_bytes += skb->len;
 409                 return 1;
 410         }
 411
 412         if (ieee->host_decrypt) {
 413                 int idx = 0;
 414                 if (skb->len >= hdrlen + 3)
 415                         idx = skb->data[hdrlen + 3] >> 6;
 416                 crypt = ieee->crypt[idx];
 417 #ifdef NOT_YET
 418                 sta = NULL;
 419
 420                 /* Use station specific key to override default keys if the
 421                  * receiver address is a unicast address ("individual RA"). If
 422                  * bcrx_sta_key parameter is set, station specific key is used
 423                  * even with broad/multicast targets (this is against IEEE
 424                  * 802.11, but makes it easier to use different keys with
 425                  * stations that do not support WEP key mapping). */
 426
 427                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
 428                         (void)hostap_handle_sta_crypto(local, hdr, &crypt,
 429                                                        &sta);
 430 #endif
 431
 432                 /* allow NULL decrypt to indicate an station specific override
 433                  * for default encryption */
 434                 if (crypt && (crypt->ops == NULL ||
 435                               crypt->ops->decrypt_mpdu == NULL))
 436                         crypt = NULL;
 437
 438                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 439                         /* This seems to be triggered by some (multicast?)
 440                          * frames from other than current BSS, so just drop the
 441                          * frames silently instead of filling system log with
 442                          * these reports. */
 443                         IEEE80211_DEBUG_DROP("Decryption failed (not set)"
 444                                              " (SA=" MAC_FMT ")\n",
 445                                              MAC_ARG(hdr->addr2));
 446                         ieee->ieee_stats.rx_discards_undecryptable++;
 447                         goto rx_dropped;
 448                 }
 449         }
 450 #ifdef NOT_YET
 451         if (type != WLAN_FC_TYPE_DATA) {
 452                 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
 453                     fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
 454                     (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
 455                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 456                                "from " MAC_FMT "\n", dev->name,
 457                                MAC_ARG(hdr->addr2));
 458                         /* TODO: could inform hostapd about this so that it
 459                          * could send auth failure report */
 460                         goto rx_dropped;
 461                 }
 462
 463                 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
 464                         goto rx_dropped;
 465                 else
 466                         goto rx_exit;
 467         }
 468 #endif
 469
 470         /* Data frame - extract src/dst addresses */
 471         if (skb->len < IEEE80211_3ADDR_LEN)
 472                 goto rx_dropped;
 473
 474         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 475         case IEEE80211_FCTL_FROMDS:
 476                 memcpy(dst, hdr->addr1, ETH_ALEN);
 477                 memcpy(src, hdr->addr3, ETH_ALEN);
 478                 break;
 479         case IEEE80211_FCTL_TODS:
 480                 memcpy(dst, hdr->addr3, ETH_ALEN);
 481                 memcpy(src, hdr->addr2, ETH_ALEN);
 482                 break;
 483         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 484                 if (skb->len < IEEE80211_4ADDR_LEN)
 485                         goto rx_dropped;
 486                 memcpy(dst, hdr->addr3, ETH_ALEN);
 487                 memcpy(src, hdr->addr4, ETH_ALEN);
 488                 break;
 489         case 0:
 490                 memcpy(dst, hdr->addr1, ETH_ALEN);
 491                 memcpy(src, hdr->addr2, ETH_ALEN);
 492                 break;
 493         }
 494
 495 #ifdef NOT_YET
 496         if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
 497                 goto rx_dropped;
 498         if (wds) {
 499                 skb->dev = dev = wds;
 500                 stats = hostap_get_stats(dev);
 501         }
 502
 503         if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
 504             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 505             IEEE80211_FCTL_FROMDS && ieee->stadev
 506             && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
 507                 /* Frame from BSSID of the AP for which we are a client */
 508                 skb->dev = dev = ieee->stadev;
 509                 stats = hostap_get_stats(dev);
 510                 from_assoc_ap = 1;
 511         }
 512 #endif
 513
 514         dev->last_rx = jiffies;
 515
 516 #ifdef NOT_YET
 517         if ((ieee->iw_mode == IW_MODE_MASTER ||
 518              ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
 519                 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
 520                                              wds != NULL)) {
 521                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
 522                         frame_authorized = 0;
 523                         break;
 524                 case AP_RX_CONTINUE:
 525                         frame_authorized = 1;
 526                         break;
 527                 case AP_RX_DROP:
 528                         goto rx_dropped;
 529                 case AP_RX_EXIT:
 530                         goto rx_exit;
 531                 }
 532         }
 533 #endif
 534
 535         /* Nullfunc frames may have PS-bit set, so they must be passed to
 536          * hostap_handle_sta_rx() before being dropped here. */
 537         if (stype != IEEE80211_STYPE_DATA &&
 538             stype != IEEE80211_STYPE_DATA_CFACK &&
 539             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 540             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 541                 if (stype != IEEE80211_STYPE_NULLFUNC)
 542                         IEEE80211_DEBUG_DROP("RX: dropped data frame "
 543                                              "with no data (type=0x%02x, "
 544                                              "subtype=0x%02x, len=%d)\n",
 545                                              type, stype, skb->len);
 546                 goto rx_dropped;
 547         }
 548
 549         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 550
 551         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 552             (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
 553                 goto rx_dropped;
 554
 555         hdr = (struct ieee80211_hdr_4addr *)skb->data;
 556
 557         /* skb: hdr + (possibly fragmented) plaintext payload */
 558         // PR: FIXME: hostap has additional conditions in the "if" below:
 559         // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 560         if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
 561                 int flen;
 562                 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
 563                 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
 564
 565                 if (!frag_skb) {
 566                         IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
 567                                         "Rx cannot get skb from fragment "
 568                                         "cache (morefrag=%d seq=%u frag=%u)\n",
 569                                         (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 570                                         WLAN_GET_SEQ_SEQ(sc), frag);
 571                         goto rx_dropped;
 572                 }
 573
 574                 flen = skb->len;
 575                 if (frag != 0)
 576                         flen -= hdrlen;
 577
 578                 if (frag_skb->tail + flen > frag_skb->end) {
 579                         printk(KERN_WARNING "%s: host decrypted and "
 580                                "reassembled frame did not fit skb\n",
 581                                dev->name);
 582                         ieee80211_frag_cache_invalidate(ieee, hdr);
 583                         goto rx_dropped;
 584                 }
 585
 586                 if (frag == 0) {
 587                         /* copy first fragment (including full headers) into
 588                          * beginning of the fragment cache skb */
 589                         memcpy(skb_put(frag_skb, flen), skb->data, flen);
 590                 } else {
 591                         /* append frame payload to the end of the fragment
 592                          * cache skb */
 593                         memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
 594                                flen);
 595                 }
 596                 dev_kfree_skb_any(skb);
 597                 skb = NULL;
 598
 599                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
 600                         /* more fragments expected - leave the skb in fragment
 601                          * cache for now; it will be delivered to upper layers
 602                          * after all fragments have been received */
 603                         goto rx_exit;
 604                 }
 605
 606                 /* this was the last fragment and the frame will be
 607                  * delivered, so remove skb from fragment cache */
 608                 skb = frag_skb;
 609                 hdr = (struct ieee80211_hdr_4addr *)skb->data;
 610                 ieee80211_frag_cache_invalidate(ieee, hdr);
 611         }
 612
 613         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 614          * encrypted/authenticated */
 615         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 616             ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
 617                 goto rx_dropped;
 618
 619         hdr = (struct ieee80211_hdr_4addr *)skb->data;
 620         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
 621                 if (            /*ieee->ieee802_1x && */
 622                            ieee80211_is_eapol_frame(ieee, skb)) {
 623                         /* pass unencrypted EAPOL frames even if encryption is
 624                          * configured */
 625                 } else {
 626                         IEEE80211_DEBUG_DROP("encryption configured, but RX "
 627                                              "frame not encrypted (SA=" MAC_FMT
 628                                              ")\n", MAC_ARG(hdr->addr2));
 629                         goto rx_dropped;
 630                 }
 631         }
 632
 633         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
 634             !ieee80211_is_eapol_frame(ieee, skb)) {
 635                 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
 636                                      "frame from " MAC_FMT
 637                                      " (drop_unencrypted=1)\n",
 638                                      MAC_ARG(hdr->addr2));
 639                 goto rx_dropped;
 640         }
 641
 642         /* skb: hdr + (possible reassembled) full plaintext payload */
 643
 644         payload = skb->data + hdrlen;
 645         ethertype = (payload[6] << 8) | payload[7];
 646
 647 #ifdef NOT_YET
 648         /* If IEEE 802.1X is used, check whether the port is authorized to send
 649          * the received frame. */
 650         if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
 651                 if (ethertype == ETH_P_PAE) {
 652                         printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
 653                                dev->name);
 654                         if (ieee->hostapd && ieee->apdev) {
 655                                 /* Send IEEE 802.1X frames to the user
 656                                  * space daemon for processing */
 657                                 prism2_rx_80211(ieee->apdev, skb, rx_stats,
 658                                                 PRISM2_RX_MGMT);
 659                                 ieee->apdevstats.rx_packets++;
 660                                 ieee->apdevstats.rx_bytes += skb->len;
 661                                 goto rx_exit;
 662                         }
 663                 } else if (!frame_authorized) {
 664                         printk(KERN_DEBUG "%s: dropped frame from "
 665                                "unauthorized port (IEEE 802.1X): "
 666                                "ethertype=0x%04x\n", dev->name, ethertype);
 667                         goto rx_dropped;
 668                 }
 669         }
 670 #endif
 671
 672         /* convert hdr + possible LLC headers into Ethernet header */
 673         if (skb->len - hdrlen >= 8 &&
 674             ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
 675               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 676              memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
 677                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 678                  * replace EtherType */
 679                 skb_pull(skb, hdrlen + SNAP_SIZE);
 680                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 681                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 682         } else {
 683                 u16 len;
 684                 /* Leave Ethernet header part of hdr and full payload */
 685                 skb_pull(skb, hdrlen);
 686                 len = htons(skb->len);
 687                 memcpy(skb_push(skb, 2), &len, 2);
 688                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 689                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 690         }
 691
 692 #ifdef NOT_YET
 693         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 694                     IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
 695                 /* Non-standard frame: get addr4 from its bogus location after
 696                  * the payload */
 697                 memcpy(skb->data + ETH_ALEN,
 698                        skb->data + skb->len - ETH_ALEN, ETH_ALEN);
 699                 skb_trim(skb, skb->len - ETH_ALEN);
 700         }
 701 #endif
 702
 703         stats->rx_packets++;
 704         stats->rx_bytes += skb->len;
 705
 706 #ifdef NOT_YET
 707         if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
 708                 if (dst[0] & 0x01) {
 709                         /* copy multicast frame both to the higher layers and
 710                          * to the wireless media */
 711                         ieee->ap->bridged_multicast++;
 712                         skb2 = skb_clone(skb, GFP_ATOMIC);
 713                         if (skb2 == NULL)
 714                                 printk(KERN_DEBUG "%s: skb_clone failed for "
 715                                        "multicast frame\n", dev->name);
 716                 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
 717                         /* send frame directly to the associated STA using
 718                          * wireless media and not passing to higher layers */
 719                         ieee->ap->bridged_unicast++;
 720                         skb2 = skb;
 721                         skb = NULL;
 722                 }
 723         }
 724
 725         if (skb2 != NULL) {
 726                 /* send to wireless media */
 727                 skb2->protocol = __constant_htons(ETH_P_802_3);
 728                 skb2->mac.raw = skb2->nh.raw = skb2->data;
 729                 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
 730                 skb2->dev = dev;
 731                 dev_queue_xmit(skb2);
 732         }
 733 #endif
 734
 735         if (skb) {
 736                 skb->protocol = eth_type_trans(skb, dev);
 737                 memset(skb->cb, 0, sizeof(skb->cb));
 738                 skb->dev = dev;
 739                 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
 740                 netif_rx(skb);
 741         }
 742
 743       rx_exit:
 744 #ifdef NOT_YET
 745         if (sta)
 746                 hostap_handle_sta_release(sta);
 747 #endif
 748         return 1;
 749
 750       rx_dropped:
 751         stats->rx_dropped++;
 752
 753         /* Returning 0 indicates to caller that we have not handled the SKB--
 754          * so it is still allocated and can be used again by underlying
 755          * hardware as a DMA target */
 756         return 0;
 757 }
 758
 759 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
 760
 761 static inline int ieee80211_is_ofdm_rate(u8 rate)
 762 {
 763         switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
 764         case IEEE80211_OFDM_RATE_6MB:
 765         case IEEE80211_OFDM_RATE_9MB:
 766         case IEEE80211_OFDM_RATE_12MB:
 767         case IEEE80211_OFDM_RATE_18MB:
 768         case IEEE80211_OFDM_RATE_24MB:
 769         case IEEE80211_OFDM_RATE_36MB:
 770         case IEEE80211_OFDM_RATE_48MB:
 771         case IEEE80211_OFDM_RATE_54MB:
 772                 return 1;
 773         }
 774         return 0;
 775 }
 776
 777 static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
 778                                          *beacon,
 779                                          struct ieee80211_network *network,
 780                                          struct ieee80211_rx_stats *stats)
 781 {
 782 #ifdef CONFIG_IEEE80211_DEBUG
 783         char rates_str[64];
 784         char *p;
 785 #endif
 786         struct ieee80211_info_element *info_element;
 787         u16 left;
 788         u8 i;
 789
 790         /* Pull out fixed field data */
 791         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
 792         network->capability = le16_to_cpu(beacon->capability);
 793         network->last_scanned = jiffies;
 794         network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
 795         network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
 796         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
 797         /* Where to pull this? beacon->listen_interval; */
 798         network->listen_interval = 0x0A;
 799         network->rates_len = network->rates_ex_len = 0;
 800         network->last_associate = 0;
 801         network->ssid_len = 0;
 802         network->flags = 0;
 803         network->atim_window = 0;
 804
 805         if (stats->freq == IEEE80211_52GHZ_BAND) {
 806                 /* for A band (No DS info) */
 807                 network->channel = stats->received_channel;
 808         } else
 809                 network->flags |= NETWORK_HAS_CCK;
 810
 811         network->wpa_ie_len = 0;
 812         network->rsn_ie_len = 0;
 813
 814         info_element = beacon->info_element;
 815         left = stats->len - sizeof(*beacon);
 816         while (left >= sizeof(struct ieee80211_info_element)) {
 817                 if (sizeof(struct ieee80211_info_element) + info_element->len >
 818                     left) {
 819                         IEEE80211_DEBUG_SCAN
 820                             ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
 821                              info_element->len +
 822                              sizeof(struct ieee80211_info_element), left);
 823                         return 1;
 824                 }
 825
 826                 switch (info_element->id) {
 827                 case MFIE_TYPE_SSID:
 828                         if (ieee80211_is_empty_essid(info_element->data,
 829                                                      info_element->len)) {
 830                                 network->flags |= NETWORK_EMPTY_ESSID;
 831                                 break;
 832                         }
 833
 834                         network->ssid_len = min(info_element->len,
 835                                                 (u8) IW_ESSID_MAX_SIZE);
 836                         memcpy(network->ssid, info_element->data,
 837                                network->ssid_len);
 838                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
 839                                 memset(network->ssid + network->ssid_len, 0,
 840                                        IW_ESSID_MAX_SIZE - network->ssid_len);
 841
 842                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
 843                                              network->ssid, network->ssid_len);
 844                         break;
 845
 846                 case MFIE_TYPE_RATES:
 847 #ifdef CONFIG_IEEE80211_DEBUG
 848                         p = rates_str;
 849 #endif
 850                         network->rates_len =
 851                             min(info_element->len, MAX_RATES_LENGTH);
 852                         for (i = 0; i < network->rates_len; i++) {
 853                                 network->rates[i] = info_element->data[i];
 854 #ifdef CONFIG_IEEE80211_DEBUG
 855                                 p += snprintf(p,
 856                                               sizeof(rates_str) - (p -
 857                                                                    rates_str),
 858                                               "%02X ", network->rates[i]);
 859 #endif
 860                                 if (ieee80211_is_ofdm_rate
 861                                     (info_element->data[i])) {
 862                                         network->flags |= NETWORK_HAS_OFDM;
 863                                         if (info_element->data[i] &
 864                                             IEEE80211_BASIC_RATE_MASK)
 865                                                 network->flags &=
 866                                                     ~NETWORK_HAS_CCK;
 867                                 }
 868                         }
 869
 870                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
 871                                              rates_str, network->rates_len);
 872                         break;
 873
 874                 case MFIE_TYPE_RATES_EX:
 875 #ifdef CONFIG_IEEE80211_DEBUG
 876                         p = rates_str;
 877 #endif
 878                         network->rates_ex_len =
 879                             min(info_element->len, MAX_RATES_EX_LENGTH);
 880                         for (i = 0; i < network->rates_ex_len; i++) {
 881                                 network->rates_ex[i] = info_element->data[i];
 882 #ifdef CONFIG_IEEE80211_DEBUG
 883                                 p += snprintf(p,
 884                                               sizeof(rates_str) - (p -
 885                                                                    rates_str),
 886                                               "%02X ", network->rates[i]);
 887 #endif
 888                                 if (ieee80211_is_ofdm_rate
 889                                     (info_element->data[i])) {
 890                                         network->flags |= NETWORK_HAS_OFDM;
 891                                         if (info_element->data[i] &
 892                                             IEEE80211_BASIC_RATE_MASK)
 893                                                 network->flags &=
 894                                                     ~NETWORK_HAS_CCK;
 895                                 }
 896                         }
 897
 898                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
 899                                              rates_str, network->rates_ex_len);
 900                         break;
 901
 902                 case MFIE_TYPE_DS_SET:
 903                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
 904                                              info_element->data[0]);
 905                         if (stats->freq == IEEE80211_24GHZ_BAND)
 906                                 network->channel = info_element->data[0];
 907                         break;
 908
 909                 case MFIE_TYPE_FH_SET:
 910                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
 911                         break;
 912
 913                 case MFIE_TYPE_CF_SET:
 914                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
 915                         break;
 916
 917                 case MFIE_TYPE_TIM:
 918                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n");
 919                         break;
 920
 921                 case MFIE_TYPE_IBSS_SET:
 922                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
 923                         break;
 924
 925                 case MFIE_TYPE_CHALLENGE:
 926                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
 927                         break;
 928
 929                 case MFIE_TYPE_GENERIC:
 930                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
 931                                              info_element->len);
 932                         if (info_element->len >= 4 &&
 933                             info_element->data[0] == 0x00 &&
 934                             info_element->data[1] == 0x50 &&
 935                             info_element->data[2] == 0xf2 &&
 936                             info_element->data[3] == 0x01) {
 937                                 network->wpa_ie_len = min(info_element->len + 2,
 938                                                           MAX_WPA_IE_LEN);
 939                                 memcpy(network->wpa_ie, info_element,
 940                                        network->wpa_ie_len);
 941                         }
 942                         break;
 943
 944                 case MFIE_TYPE_RSN:
 945                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
 946                                              info_element->len);
 947                         network->rsn_ie_len = min(info_element->len + 2,
 948                                                   MAX_WPA_IE_LEN);
 949                         memcpy(network->rsn_ie, info_element,
 950                                network->rsn_ie_len);
 951                         break;
 952
 953                 default:
 954                         IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
 955                                              info_element->id);
 956                         break;
 957                 }
 958
 959                 left -= sizeof(struct ieee80211_info_element) +
 960                     info_element->len;
 961                 info_element = (struct ieee80211_info_element *)
 962                     &info_element->data[info_element->len];
 963         }
 964
 965         network->mode = 0;
 966         if (stats->freq == IEEE80211_52GHZ_BAND)
 967                 network->mode = IEEE_A;
 968         else {
 969                 if (network->flags & NETWORK_HAS_OFDM)
 970                         network->mode |= IEEE_G;
 971                 if (network->flags & NETWORK_HAS_CCK)
 972                         network->mode |= IEEE_B;
 973         }
 974
 975         if (network->mode == 0) {
 976                 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
 977                                      "network.\n",
 978                                      escape_essid(network->ssid,
 979                                                   network->ssid_len),
 980                                      MAC_ARG(network->bssid));
 981                 return 1;
 982         }
 983
 984         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
 985                 network->flags |= NETWORK_EMPTY_ESSID;
 986
 987         memcpy(&network->stats, stats, sizeof(network->stats));
 988
 989         return 0;
 990 }
 991
 992 static inline int is_same_network(struct ieee80211_network *src,
 993                                   struct ieee80211_network *dst)
 994 {
 995         /* A network is only a duplicate if the channel, BSSID, and ESSID
 996          * all match.  We treat all <hidden> with the same BSSID and channel
 997          * as one network */
 998         return ((src->ssid_len == dst->ssid_len) &&
 999                 (src->channel == dst->channel) &&
1000                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1001                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1002 }
1003
1004 static inline void update_network(struct ieee80211_network *dst,
1005                                   struct ieee80211_network *src)
1006 {
1007         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1008         dst->capability = src->capability;
1009         memcpy(dst->rates, src->rates, src->rates_len);
1010         dst->rates_len = src->rates_len;
1011         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1012         dst->rates_ex_len = src->rates_ex_len;
1013
1014         dst->mode = src->mode;
1015         dst->flags = src->flags;
1016         dst->time_stamp[0] = src->time_stamp[0];
1017         dst->time_stamp[1] = src->time_stamp[1];
1018
1019         dst->beacon_interval = src->beacon_interval;
1020         dst->listen_interval = src->listen_interval;
1021         dst->atim_window = src->atim_window;
1022
1023         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1024         dst->wpa_ie_len = src->wpa_ie_len;
1025         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1026         dst->rsn_ie_len = src->rsn_ie_len;
1027
1028         dst->last_scanned = jiffies;
1029         /* dst->last_associate is not overwritten */
1030 }
1031
1032 static inline void ieee80211_process_probe_response(struct ieee80211_device
1033                                                     *ieee, struct
1034                                                     ieee80211_probe_response
1035                                                     *beacon, struct ieee80211_rx_stats
1036                                                     *stats)
1037 {
1038         struct ieee80211_network network;
1039         struct ieee80211_network *target;
1040         struct ieee80211_network *oldest = NULL;
1041 #ifdef CONFIG_IEEE80211_DEBUG
1042         struct ieee80211_info_element *info_element = beacon->info_element;
1043 #endif
1044         unsigned long flags;
1045
1046         IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1047                              "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1048                              escape_essid(info_element->data,
1049                                           info_element->len),
1050                              MAC_ARG(beacon->header.addr3),
1051                              (beacon->capability & (1 << 0xf)) ? '1' : '0',
1052                              (beacon->capability & (1 << 0xe)) ? '1' : '0',
1053                              (beacon->capability & (1 << 0xd)) ? '1' : '0',
1054                              (beacon->capability & (1 << 0xc)) ? '1' : '0',
1055                              (beacon->capability & (1 << 0xb)) ? '1' : '0',
1056                              (beacon->capability & (1 << 0xa)) ? '1' : '0',
1057                              (beacon->capability & (1 << 0x9)) ? '1' : '0',
1058                              (beacon->capability & (1 << 0x8)) ? '1' : '0',
1059                              (beacon->capability & (1 << 0x7)) ? '1' : '0',
1060                              (beacon->capability & (1 << 0x6)) ? '1' : '0',
1061                              (beacon->capability & (1 << 0x5)) ? '1' : '0',
1062                              (beacon->capability & (1 << 0x4)) ? '1' : '0',
1063                              (beacon->capability & (1 << 0x3)) ? '1' : '0',
1064                              (beacon->capability & (1 << 0x2)) ? '1' : '0',
1065                              (beacon->capability & (1 << 0x1)) ? '1' : '0',
1066                              (beacon->capability & (1 << 0x0)) ? '1' : '0');
1067
1068         if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1069                 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1070                                      escape_essid(info_element->data,
1071                                                   info_element->len),
1072                                      MAC_ARG(beacon->header.addr3),
1073                                      WLAN_FC_GET_STYPE(le16_to_cpu
1074                                                        (beacon->header.
1075                                                         frame_ctl)) ==
1076                                      IEEE80211_STYPE_PROBE_RESP ?
1077                                      "PROBE RESPONSE" : "BEACON");
1078                 return;
1079         }
1080
1081         /* The network parsed correctly -- so now we scan our known networks
1082          * to see if we can find it in our list.
1083          *
1084          * NOTE:  This search is definitely not optimized.  Once its doing
1085          *        the "right thing" we'll optimize it for efficiency if
1086          *        necessary */
1087
1088         /* Search for this entry in the list and update it if it is
1089          * already there. */
1090
1091         spin_lock_irqsave(&ieee->lock, flags);
1092
1093         list_for_each_entry(target, &ieee->network_list, list) {
1094                 if (is_same_network(target, &network))
1095                         break;
1096
1097                 if ((oldest == NULL) ||
1098                     (target->last_scanned < oldest->last_scanned))
1099                         oldest = target;
1100         }
1101
1102         /* If we didn't find a match, then get a new network slot to initialize
1103          * with this beacon's information */
1104         if (&target->list == &ieee->network_list) {
1105                 if (list_empty(&ieee->network_free_list)) {
1106                         /* If there are no more slots, expire the oldest */
1107                         list_del(&oldest->list);
1108                         target = oldest;
1109                         IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1110                                              "network list.\n",
1111                                              escape_essid(target->ssid,
1112                                                           target->ssid_len),
1113                                              MAC_ARG(target->bssid));
1114                 } else {
1115                         /* Otherwise just pull from the free list */
1116                         target = list_entry(ieee->network_free_list.next,
1117                                             struct ieee80211_network, list);
1118                         list_del(ieee->network_free_list.next);
1119                 }
1120
1121 #ifdef CONFIG_IEEE80211_DEBUG
1122                 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1123                                      escape_essid(network.ssid,
1124                                                   network.ssid_len),
1125                                      MAC_ARG(network.bssid),
1126                                      WLAN_FC_GET_STYPE(le16_to_cpu
1127                                                        (beacon->header.
1128                                                         frame_ctl)) ==
1129                                      IEEE80211_STYPE_PROBE_RESP ?
1130                                      "PROBE RESPONSE" : "BEACON");
1131 #endif
1132                 memcpy(target, &network, sizeof(*target));
1133                 list_add_tail(&target->list, &ieee->network_list);
1134         } else {
1135                 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1136                                      escape_essid(target->ssid,
1137                                                   target->ssid_len),
1138                                      MAC_ARG(target->bssid),
1139                                      WLAN_FC_GET_STYPE(le16_to_cpu
1140                                                        (beacon->header.
1141                                                         frame_ctl)) ==
1142                                      IEEE80211_STYPE_PROBE_RESP ?
1143                                      "PROBE RESPONSE" : "BEACON");
1144                 update_network(target, &network);
1145         }
1146
1147         spin_unlock_irqrestore(&ieee->lock, flags);
1148 }
1149
1150 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1151                       struct ieee80211_hdr_4addr *header,
1152                       struct ieee80211_rx_stats *stats)
1153 {
1154         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1155         case IEEE80211_STYPE_ASSOC_RESP:
1156                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1157                                      WLAN_FC_GET_STYPE(le16_to_cpu
1158                                                        (header->frame_ctl)));
1159                 break;
1160
1161         case IEEE80211_STYPE_REASSOC_RESP:
1162                 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1163                                      WLAN_FC_GET_STYPE(le16_to_cpu
1164                                                        (header->frame_ctl)));
1165                 break;
1166
1167         case IEEE80211_STYPE_PROBE_RESP:
1168                 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1169                                      WLAN_FC_GET_STYPE(le16_to_cpu
1170                                                        (header->frame_ctl)));
1171                 IEEE80211_DEBUG_SCAN("Probe response\n");
1172                 ieee80211_process_probe_response(ieee,
1173                                                  (struct
1174                                                   ieee80211_probe_response *)
1175                                                  header, stats);
1176                 break;
1177
1178         case IEEE80211_STYPE_BEACON:
1179                 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1180                                      WLAN_FC_GET_STYPE(le16_to_cpu
1181                                                        (header->frame_ctl)));
1182                 IEEE80211_DEBUG_SCAN("Beacon\n");
1183                 ieee80211_process_probe_response(ieee,
1184                                                  (struct
1185                                                   ieee80211_probe_response *)
1186                                                  header, stats);
1187                 break;
1188
1189         default:
1190                 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1191                                      WLAN_FC_GET_STYPE(le16_to_cpu
1192                                                        (header->frame_ctl)));
1193                 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1194                                   ieee->dev->name,
1195                                   WLAN_FC_GET_STYPE(le16_to_cpu
1196                                                     (header->frame_ctl)));
1197                 break;
1198         }
1199 }
1200
1201 EXPORT_SYMBOL(ieee80211_rx_mgt);
1202 EXPORT_SYMBOL(ieee80211_rx);