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 *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) +
 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 *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 *)
 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 *hdr;
 236         u8 *pos;
 237
 238         if (skb->len < 24)
 239                 return 0;
 240
 241         hdr = (struct ieee80211_hdr *)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 *hdr;
 275         int res, hdrlen;
 276
 277         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 278                 return 0;
 279
 280         hdr = (struct ieee80211_hdr *)skb->data;
 281         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 282
 283 #ifdef CONFIG_IEEE80211_CRYPT_TKIP
 284         if (ieee->tkip_countermeasures && strcmp(crypt->ops->name, "TKIP") == 0) {
 285                 if (net_ratelimit()) {
 286                         printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
 287                                "received packet from " MAC_FMT "\n",
 288                                ieee->dev->name, MAC_ARG(hdr->addr2));
 289                 }
 290                 return -1;
 291         }
 292 #endif
 293
 294         atomic_inc(&crypt->refcnt);
 295         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 296         atomic_dec(&crypt->refcnt);
 297         if (res < 0) {
 298                 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
 299                                      ") res=%d\n", MAC_ARG(hdr->addr2), res);
 300                 if (res == -2)
 301                         IEEE80211_DEBUG_DROP("Decryption failed ICV "
 302                                              "mismatch (key %d)\n",
 303                                              skb->data[hdrlen + 3] >> 6);
 304                 ieee->ieee_stats.rx_discards_undecryptable++;
 305                 return -1;
 306         }
 307
 308         return res;
 309 }
 310
 311 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
 312 static inline int
 313 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
 314                                 struct sk_buff *skb, int keyidx,
 315                                 struct ieee80211_crypt_data *crypt)
 316 {
 317         struct ieee80211_hdr *hdr;
 318         int res, hdrlen;
 319
 320         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 321                 return 0;
 322
 323         hdr = (struct ieee80211_hdr *)skb->data;
 324         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 325
 326         atomic_inc(&crypt->refcnt);
 327         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 328         atomic_dec(&crypt->refcnt);
 329         if (res < 0) {
 330                 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
 331                        " (SA=" MAC_FMT " keyidx=%d)\n",
 332                        ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
 333                 return -1;
 334         }
 335
 336         return 0;
 337 }
 338
 339 /* All received frames are sent to this function. @skb contains the frame in
 340  * IEEE 802.11 format, i.e., in the format it was sent over air.
 341  * This function is called only as a tasklet (software IRQ). */
 342 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 343                  struct ieee80211_rx_stats *rx_stats)
 344 {
 345         struct net_device *dev = ieee->dev;
 346         struct ieee80211_hdr *hdr;
 347         size_t hdrlen;
 348         u16 fc, type, stype, sc;
 349         struct net_device_stats *stats;
 350         unsigned int frag;
 351         u8 *payload;
 352         u16 ethertype;
 353 #ifdef NOT_YET
 354         struct net_device *wds = NULL;
 355         struct sk_buff *skb2 = NULL;
 356         struct net_device *wds = NULL;
 357         int frame_authorized = 0;
 358         int from_assoc_ap = 0;
 359         void *sta = NULL;
 360 #endif
 361         u8 dst[ETH_ALEN];
 362         u8 src[ETH_ALEN];
 363         struct ieee80211_crypt_data *crypt = NULL;
 364         int keyidx = 0;
 365
 366         hdr = (struct ieee80211_hdr *)skb->data;
 367         stats = &ieee->stats;
 368
 369         if (skb->len < 10) {
 370                 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
 371                 goto rx_dropped;
 372         }
 373
 374         fc = le16_to_cpu(hdr->frame_ctl);
 375         type = WLAN_FC_GET_TYPE(fc);
 376         stype = WLAN_FC_GET_STYPE(fc);
 377         sc = le16_to_cpu(hdr->seq_ctl);
 378         frag = WLAN_GET_SEQ_FRAG(sc);
 379         hdrlen = ieee80211_get_hdrlen(fc);
 380
 381 #ifdef NOT_YET
 382 #if WIRELESS_EXT > 15
 383         /* Put this code here so that we avoid duplicating it in all
 384          * Rx paths. - Jean II */
 385 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
 386         /* If spy monitoring on */
 387         if (iface->spy_data.spy_number > 0) {
 388                 struct iw_quality wstats;
 389                 wstats.level = rx_stats->signal;
 390                 wstats.noise = rx_stats->noise;
 391                 wstats.updated = 6;     /* No qual value */
 392                 /* Update spy records */
 393                 wireless_spy_update(dev, hdr->addr2, &wstats);
 394         }
 395 #endif                          /* IW_WIRELESS_SPY */
 396 #endif                          /* WIRELESS_EXT > 15 */
 397         hostap_update_rx_stats(local->ap, hdr, rx_stats);
 398 #endif
 399
 400 #if WIRELESS_EXT > 15
 401         if (ieee->iw_mode == IW_MODE_MONITOR) {
 402                 ieee80211_monitor_rx(ieee, skb, rx_stats);
 403                 stats->rx_packets++;
 404                 stats->rx_bytes += skb->len;
 405                 return 1;
 406         }
 407 #endif
 408
 409         if (ieee->host_decrypt) {
 410                 int idx = 0;
 411                 if (skb->len >= hdrlen + 3)
 412                         idx = skb->data[hdrlen + 3] >> 6;
 413                 crypt = ieee->crypt[idx];
 414 #ifdef NOT_YET
 415                 sta = NULL;
 416
 417                 /* Use station specific key to override default keys if the
 418                  * receiver address is a unicast address ("individual RA"). If
 419                  * bcrx_sta_key parameter is set, station specific key is used
 420                  * even with broad/multicast targets (this is against IEEE
 421                  * 802.11, but makes it easier to use different keys with
 422                  * stations that do not support WEP key mapping). */
 423
 424                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
 425                         (void)hostap_handle_sta_crypto(local, hdr, &crypt,
 426                                                        &sta);
 427 #endif
 428
 429                 /* allow NULL decrypt to indicate an station specific override
 430                  * for default encryption */
 431                 if (crypt && (crypt->ops == NULL ||
 432                               crypt->ops->decrypt_mpdu == NULL))
 433                         crypt = NULL;
 434
 435                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 436                         /* This seems to be triggered by some (multicast?)
 437                          * frames from other than current BSS, so just drop the
 438                          * frames silently instead of filling system log with
 439                          * these reports. */
 440                         IEEE80211_DEBUG_DROP("Decryption failed (not set)"
 441                                              " (SA=" MAC_FMT ")\n",
 442                                              MAC_ARG(hdr->addr2));
 443                         ieee->ieee_stats.rx_discards_undecryptable++;
 444                         goto rx_dropped;
 445                 }
 446         }
 447 #ifdef NOT_YET
 448         if (type != WLAN_FC_TYPE_DATA) {
 449                 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
 450                     fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
 451                     (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
 452                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 453                                "from " MAC_FMT "\n", dev->name,
 454                                MAC_ARG(hdr->addr2));
 455                         /* TODO: could inform hostapd about this so that it
 456                          * could send auth failure report */
 457                         goto rx_dropped;
 458                 }
 459
 460                 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
 461                         goto rx_dropped;
 462                 else
 463                         goto rx_exit;
 464         }
 465 #endif
 466
 467         /* Data frame - extract src/dst addresses */
 468         if (skb->len < IEEE80211_3ADDR_LEN)
 469                 goto rx_dropped;
 470
 471         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 472         case IEEE80211_FCTL_FROMDS:
 473                 memcpy(dst, hdr->addr1, ETH_ALEN);
 474                 memcpy(src, hdr->addr3, ETH_ALEN);
 475                 break;
 476         case IEEE80211_FCTL_TODS:
 477                 memcpy(dst, hdr->addr3, ETH_ALEN);
 478                 memcpy(src, hdr->addr2, ETH_ALEN);
 479                 break;
 480         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 481                 if (skb->len < IEEE80211_4ADDR_LEN)
 482                         goto rx_dropped;
 483                 memcpy(dst, hdr->addr3, ETH_ALEN);
 484                 memcpy(src, hdr->addr4, ETH_ALEN);
 485                 break;
 486         case 0:
 487                 memcpy(dst, hdr->addr1, ETH_ALEN);
 488                 memcpy(src, hdr->addr2, ETH_ALEN);
 489                 break;
 490         }
 491
 492 #ifdef NOT_YET
 493         if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
 494                 goto rx_dropped;
 495         if (wds) {
 496                 skb->dev = dev = wds;
 497                 stats = hostap_get_stats(dev);
 498         }
 499
 500         if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
 501             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 502             IEEE80211_FCTL_FROMDS && ieee->stadev
 503             && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
 504                 /* Frame from BSSID of the AP for which we are a client */
 505                 skb->dev = dev = ieee->stadev;
 506                 stats = hostap_get_stats(dev);
 507                 from_assoc_ap = 1;
 508         }
 509 #endif
 510
 511         dev->last_rx = jiffies;
 512
 513 #ifdef NOT_YET
 514         if ((ieee->iw_mode == IW_MODE_MASTER ||
 515              ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
 516                 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
 517                                              wds != NULL)) {
 518                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
 519                         frame_authorized = 0;
 520                         break;
 521                 case AP_RX_CONTINUE:
 522                         frame_authorized = 1;
 523                         break;
 524                 case AP_RX_DROP:
 525                         goto rx_dropped;
 526                 case AP_RX_EXIT:
 527                         goto rx_exit;
 528                 }
 529         }
 530 #endif
 531
 532         /* Nullfunc frames may have PS-bit set, so they must be passed to
 533          * hostap_handle_sta_rx() before being dropped here. */
 534         if (stype != IEEE80211_STYPE_DATA &&
 535             stype != IEEE80211_STYPE_DATA_CFACK &&
 536             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 537             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 538                 if (stype != IEEE80211_STYPE_NULLFUNC)
 539                         IEEE80211_DEBUG_DROP("RX: dropped data frame "
 540                                              "with no data (type=0x%02x, "
 541                                              "subtype=0x%02x, len=%d)\n",
 542                                              type, stype, skb->len);
 543                 goto rx_dropped;
 544         }
 545
 546         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 547
 548         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 549             (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
 550                 goto rx_dropped;
 551
 552         hdr = (struct ieee80211_hdr *)skb->data;
 553
 554         /* skb: hdr + (possibly fragmented) plaintext payload */
 555         // PR: FIXME: hostap has additional conditions in the "if" below:
 556         // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 557         if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
 558                 int flen;
 559                 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
 560                 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
 561
 562                 if (!frag_skb) {
 563                         IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
 564                                         "Rx cannot get skb from fragment "
 565                                         "cache (morefrag=%d seq=%u frag=%u)\n",
 566                                         (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 567                                         WLAN_GET_SEQ_SEQ(sc), frag);
 568                         goto rx_dropped;
 569                 }
 570
 571                 flen = skb->len;
 572                 if (frag != 0)
 573                         flen -= hdrlen;
 574
 575                 if (frag_skb->tail + flen > frag_skb->end) {
 576                         printk(KERN_WARNING "%s: host decrypted and "
 577                                "reassembled frame did not fit skb\n",
 578                                dev->name);
 579                         ieee80211_frag_cache_invalidate(ieee, hdr);
 580                         goto rx_dropped;
 581                 }
 582
 583                 if (frag == 0) {
 584                         /* copy first fragment (including full headers) into
 585                          * beginning of the fragment cache skb */
 586                         memcpy(skb_put(frag_skb, flen), skb->data, flen);
 587                 } else {
 588                         /* append frame payload to the end of the fragment
 589                          * cache skb */
 590                         memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
 591                                flen);
 592                 }
 593                 dev_kfree_skb_any(skb);
 594                 skb = NULL;
 595
 596                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
 597                         /* more fragments expected - leave the skb in fragment
 598                          * cache for now; it will be delivered to upper layers
 599                          * after all fragments have been received */
 600                         goto rx_exit;
 601                 }
 602
 603                 /* this was the last fragment and the frame will be
 604                  * delivered, so remove skb from fragment cache */
 605                 skb = frag_skb;
 606                 hdr = (struct ieee80211_hdr *)skb->data;
 607                 ieee80211_frag_cache_invalidate(ieee, hdr);
 608         }
 609
 610         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 611          * encrypted/authenticated */
 612         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 613             ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
 614                 goto rx_dropped;
 615
 616         hdr = (struct ieee80211_hdr *)skb->data;
 617         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
 618                 if (            /*ieee->ieee802_1x && */
 619                            ieee80211_is_eapol_frame(ieee, skb)) {
 620                         /* pass unencrypted EAPOL frames even if encryption is
 621                          * configured */
 622                 } else {
 623                         IEEE80211_DEBUG_DROP("encryption configured, but RX "
 624                                              "frame not encrypted (SA=" MAC_FMT
 625                                              ")\n", MAC_ARG(hdr->addr2));
 626                         goto rx_dropped;
 627                 }
 628         }
 629
 630         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
 631             !ieee80211_is_eapol_frame(ieee, skb)) {
 632                 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
 633                                      "frame from " MAC_FMT
 634                                      " (drop_unencrypted=1)\n",
 635                                      MAC_ARG(hdr->addr2));
 636                 goto rx_dropped;
 637         }
 638
 639         /* skb: hdr + (possible reassembled) full plaintext payload */
 640
 641         payload = skb->data + hdrlen;
 642         ethertype = (payload[6] << 8) | payload[7];
 643
 644 #ifdef NOT_YET
 645         /* If IEEE 802.1X is used, check whether the port is authorized to send
 646          * the received frame. */
 647         if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
 648                 if (ethertype == ETH_P_PAE) {
 649                         printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
 650                                dev->name);
 651                         if (ieee->hostapd && ieee->apdev) {
 652                                 /* Send IEEE 802.1X frames to the user
 653                                  * space daemon for processing */
 654                                 prism2_rx_80211(ieee->apdev, skb, rx_stats,
 655                                                 PRISM2_RX_MGMT);
 656                                 ieee->apdevstats.rx_packets++;
 657                                 ieee->apdevstats.rx_bytes += skb->len;
 658                                 goto rx_exit;
 659                         }
 660                 } else if (!frame_authorized) {
 661                         printk(KERN_DEBUG "%s: dropped frame from "
 662                                "unauthorized port (IEEE 802.1X): "
 663                                "ethertype=0x%04x\n", dev->name, ethertype);
 664                         goto rx_dropped;
 665                 }
 666         }
 667 #endif
 668
 669         /* convert hdr + possible LLC headers into Ethernet header */
 670         if (skb->len - hdrlen >= 8 &&
 671             ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
 672               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 673              memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
 674                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 675                  * replace EtherType */
 676                 skb_pull(skb, hdrlen + SNAP_SIZE);
 677                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 678                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 679         } else {
 680                 u16 len;
 681                 /* Leave Ethernet header part of hdr and full payload */
 682                 skb_pull(skb, hdrlen);
 683                 len = htons(skb->len);
 684                 memcpy(skb_push(skb, 2), &len, 2);
 685                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 686                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 687         }
 688
 689 #ifdef NOT_YET
 690         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 691                     IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
 692                 /* Non-standard frame: get addr4 from its bogus location after
 693                  * the payload */
 694                 memcpy(skb->data + ETH_ALEN,
 695                        skb->data + skb->len - ETH_ALEN, ETH_ALEN);
 696                 skb_trim(skb, skb->len - ETH_ALEN);
 697         }
 698 #endif
 699
 700         stats->rx_packets++;
 701         stats->rx_bytes += skb->len;
 702
 703 #ifdef NOT_YET
 704         if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
 705                 if (dst[0] & 0x01) {
 706                         /* copy multicast frame both to the higher layers and
 707                          * to the wireless media */
 708                         ieee->ap->bridged_multicast++;
 709                         skb2 = skb_clone(skb, GFP_ATOMIC);
 710                         if (skb2 == NULL)
 711                                 printk(KERN_DEBUG "%s: skb_clone failed for "
 712                                        "multicast frame\n", dev->name);
 713                 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
 714                         /* send frame directly to the associated STA using
 715                          * wireless media and not passing to higher layers */
 716                         ieee->ap->bridged_unicast++;
 717                         skb2 = skb;
 718                         skb = NULL;
 719                 }
 720         }
 721
 722         if (skb2 != NULL) {
 723                 /* send to wireless media */
 724                 skb2->protocol = __constant_htons(ETH_P_802_3);
 725                 skb2->mac.raw = skb2->nh.raw = skb2->data;
 726                 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
 727                 skb2->dev = dev;
 728                 dev_queue_xmit(skb2);
 729         }
 730 #endif
 731
 732         if (skb) {
 733                 skb->protocol = eth_type_trans(skb, dev);
 734                 memset(skb->cb, 0, sizeof(skb->cb));
 735                 skb->dev = dev;
 736                 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
 737                 netif_rx(skb);
 738         }
 739
 740       rx_exit:
 741 #ifdef NOT_YET
 742         if (sta)
 743                 hostap_handle_sta_release(sta);
 744 #endif
 745         return 1;
 746
 747       rx_dropped:
 748         stats->rx_dropped++;
 749
 750         /* Returning 0 indicates to caller that we have not handled the SKB--
 751          * so it is still allocated and can be used again by underlying
 752          * hardware as a DMA target */
 753         return 0;
 754 }
 755
 756 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
 757
 758 static inline int ieee80211_is_ofdm_rate(u8 rate)
 759 {
 760         switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
 761         case IEEE80211_OFDM_RATE_6MB:
 762         case IEEE80211_OFDM_RATE_9MB:
 763         case IEEE80211_OFDM_RATE_12MB:
 764         case IEEE80211_OFDM_RATE_18MB:
 765         case IEEE80211_OFDM_RATE_24MB:
 766         case IEEE80211_OFDM_RATE_36MB:
 767         case IEEE80211_OFDM_RATE_48MB:
 768         case IEEE80211_OFDM_RATE_54MB:
 769                 return 1;
 770         }
 771         return 0;
 772 }
 773
 774 static inline int ieee80211_network_init(struct ieee80211_device *ieee,
 775                                          struct ieee80211_probe_response
 776                                          *beacon,
 777                                          struct ieee80211_network *network,
 778                                          struct ieee80211_rx_stats *stats)
 779 {
 780 #ifdef CONFIG_IEEE80211_DEBUG
 781         char rates_str[64];
 782         char *p;
 783 #endif
 784         struct ieee80211_info_element *info_element;
 785         u16 left;
 786         u8 i;
 787
 788         /* Pull out fixed field data */
 789         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
 790         network->capability = beacon->capability;
 791         network->last_scanned = jiffies;
 792         network->time_stamp[0] = beacon->time_stamp[0];
 793         network->time_stamp[1] = beacon->time_stamp[1];
 794         network->beacon_interval = beacon->beacon_interval;
 795         /* Where to pull this? beacon->listen_interval; */
 796         network->listen_interval = 0x0A;
 797         network->rates_len = network->rates_ex_len = 0;
 798         network->last_associate = 0;
 799         network->ssid_len = 0;
 800         network->flags = 0;
 801         network->atim_window = 0;
 802
 803         if (stats->freq == IEEE80211_52GHZ_BAND) {
 804                 /* for A band (No DS info) */
 805                 network->channel = stats->received_channel;
 806         } else
 807                 network->flags |= NETWORK_HAS_CCK;
 808
 809         network->wpa_ie_len = 0;
 810         network->rsn_ie_len = 0;
 811
 812         info_element = &beacon->info_element;
 813         left = stats->len - ((void *)info_element - (void *)beacon);
 814         while (left >= sizeof(struct ieee80211_info_element_hdr)) {
 815                 if (sizeof(struct ieee80211_info_element_hdr) +
 816                     info_element->len > left) {
 817                         IEEE80211_DEBUG_SCAN
 818                             ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
 819                              info_element->len +
 820                              sizeof(struct ieee80211_info_element), left);
 821                         return 1;
 822                 }
 823
 824                 switch (info_element->id) {
 825                 case MFIE_TYPE_SSID:
 826                         if (ieee80211_is_empty_essid(info_element->data,
 827                                                      info_element->len)) {
 828                                 network->flags |= NETWORK_EMPTY_ESSID;
 829                                 break;
 830                         }
 831
 832                         network->ssid_len = min(info_element->len,
 833                                                 (u8) IW_ESSID_MAX_SIZE);
 834                         memcpy(network->ssid, info_element->data,
 835                                network->ssid_len);
 836                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
 837                                 memset(network->ssid + network->ssid_len, 0,
 838                                        IW_ESSID_MAX_SIZE - network->ssid_len);
 839
 840                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
 841                                              network->ssid, network->ssid_len);
 842                         break;
 843
 844                 case MFIE_TYPE_RATES:
 845 #ifdef CONFIG_IEEE80211_DEBUG
 846                         p = rates_str;
 847 #endif
 848                         network->rates_len =
 849                             min(info_element->len, MAX_RATES_LENGTH);
 850                         for (i = 0; i < network->rates_len; i++) {
 851                                 network->rates[i] = info_element->data[i];
 852 #ifdef CONFIG_IEEE80211_DEBUG
 853                                 p += snprintf(p,
 854                                               sizeof(rates_str) - (p -
 855                                                                    rates_str),
 856                                               "%02X ", network->rates[i]);
 857 #endif
 858                                 if (ieee80211_is_ofdm_rate
 859                                     (info_element->data[i])) {
 860                                         network->flags |= NETWORK_HAS_OFDM;
 861                                         if (info_element->data[i] &
 862                                             IEEE80211_BASIC_RATE_MASK)
 863                                                 network->flags &=
 864                                                     ~NETWORK_HAS_CCK;
 865                                 }
 866                         }
 867
 868                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
 869                                              rates_str, network->rates_len);
 870                         break;
 871
 872                 case MFIE_TYPE_RATES_EX:
 873 #ifdef CONFIG_IEEE80211_DEBUG
 874                         p = rates_str;
 875 #endif
 876                         network->rates_ex_len =
 877                             min(info_element->len, MAX_RATES_EX_LENGTH);
 878                         for (i = 0; i < network->rates_ex_len; i++) {
 879                                 network->rates_ex[i] = info_element->data[i];
 880 #ifdef CONFIG_IEEE80211_DEBUG
 881                                 p += snprintf(p,
 882                                               sizeof(rates_str) - (p -
 883                                                                    rates_str),
 884                                               "%02X ", network->rates[i]);
 885 #endif
 886                                 if (ieee80211_is_ofdm_rate
 887                                     (info_element->data[i])) {
 888                                         network->flags |= NETWORK_HAS_OFDM;
 889                                         if (info_element->data[i] &
 890                                             IEEE80211_BASIC_RATE_MASK)
 891                                                 network->flags &=
 892                                                     ~NETWORK_HAS_CCK;
 893                                 }
 894                         }
 895
 896                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
 897                                              rates_str, network->rates_ex_len);
 898                         break;
 899
 900                 case MFIE_TYPE_DS_SET:
 901                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
 902                                              info_element->data[0]);
 903                         if (stats->freq == IEEE80211_24GHZ_BAND)
 904                                 network->channel = info_element->data[0];
 905                         break;
 906
 907                 case MFIE_TYPE_FH_SET:
 908                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
 909                         break;
 910
 911                 case MFIE_TYPE_CF_SET:
 912                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
 913                         break;
 914
 915                 case MFIE_TYPE_TIM:
 916                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n");
 917                         break;
 918
 919                 case MFIE_TYPE_IBSS_SET:
 920                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
 921                         break;
 922
 923                 case MFIE_TYPE_CHALLENGE:
 924                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
 925                         break;
 926
 927                 case MFIE_TYPE_GENERIC:
 928                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
 929                                              info_element->len);
 930                         if (info_element->len >= 4 &&
 931                             info_element->data[0] == 0x00 &&
 932                             info_element->data[1] == 0x50 &&
 933                             info_element->data[2] == 0xf2 &&
 934                             info_element->data[3] == 0x01) {
 935                                 network->wpa_ie_len = min(info_element->len + 2,
 936                                                           MAX_WPA_IE_LEN);
 937                                 memcpy(network->wpa_ie, info_element,
 938                                        network->wpa_ie_len);
 939                         }
 940                         break;
 941
 942                 case MFIE_TYPE_RSN:
 943                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
 944                                              info_element->len);
 945                         network->rsn_ie_len = min(info_element->len + 2,
 946                                                   MAX_WPA_IE_LEN);
 947                         memcpy(network->rsn_ie, info_element,
 948                                network->rsn_ie_len);
 949                         break;
 950
 951                 default:
 952                         IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
 953                                              info_element->id);
 954                         break;
 955                 }
 956
 957                 left -= sizeof(struct ieee80211_info_element_hdr) +
 958                     info_element->len;
 959                 info_element = (struct ieee80211_info_element *)
 960                     &info_element->data[info_element->len];
 961         }
 962
 963         network->mode = 0;
 964         if (stats->freq == IEEE80211_52GHZ_BAND)
 965                 network->mode = IEEE_A;
 966         else {
 967                 if (network->flags & NETWORK_HAS_OFDM)
 968                         network->mode |= IEEE_G;
 969                 if (network->flags & NETWORK_HAS_CCK)
 970                         network->mode |= IEEE_B;
 971         }
 972
 973         if (network->mode == 0) {
 974                 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
 975                                      "network.\n",
 976                                      escape_essid(network->ssid,
 977                                                   network->ssid_len),
 978                                      MAC_ARG(network->bssid));
 979                 return 1;
 980         }
 981
 982         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
 983                 network->flags |= NETWORK_EMPTY_ESSID;
 984
 985         memcpy(&network->stats, stats, sizeof(network->stats));
 986
 987         return 0;
 988 }
 989
 990 static inline int is_same_network(struct ieee80211_network *src,
 991                                   struct ieee80211_network *dst)
 992 {
 993         /* A network is only a duplicate if the channel, BSSID, and ESSID
 994          * all match.  We treat all <hidden> with the same BSSID and channel
 995          * as one network */
 996         return ((src->ssid_len == dst->ssid_len) &&
 997                 (src->channel == dst->channel) &&
 998                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
 999                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1000 }
1001
1002 static inline void update_network(struct ieee80211_network *dst,
1003                                   struct ieee80211_network *src)
1004 {
1005         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1006         dst->capability = src->capability;
1007         memcpy(dst->rates, src->rates, src->rates_len);
1008         dst->rates_len = src->rates_len;
1009         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1010         dst->rates_ex_len = src->rates_ex_len;
1011
1012         dst->mode = src->mode;
1013         dst->flags = src->flags;
1014         dst->time_stamp[0] = src->time_stamp[0];
1015         dst->time_stamp[1] = src->time_stamp[1];
1016
1017         dst->beacon_interval = src->beacon_interval;
1018         dst->listen_interval = src->listen_interval;
1019         dst->atim_window = src->atim_window;
1020
1021         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1022         dst->wpa_ie_len = src->wpa_ie_len;
1023         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1024         dst->rsn_ie_len = src->rsn_ie_len;
1025
1026         dst->last_scanned = jiffies;
1027         /* dst->last_associate is not overwritten */
1028 }
1029
1030 static inline void ieee80211_process_probe_response(struct ieee80211_device
1031                                                     *ieee,
1032                                                     struct
1033                                                     ieee80211_probe_response
1034                                                     *beacon,
1035                                                     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(beacon->header.
1074                                                        frame_ctl) ==
1075                                      IEEE80211_STYPE_PROBE_RESP ?
1076                                      "PROBE RESPONSE" : "BEACON");
1077                 return;
1078         }
1079
1080         /* The network parsed correctly -- so now we scan our known networks
1081          * to see if we can find it in our list.
1082          *
1083          * NOTE:  This search is definitely not optimized.  Once its doing
1084          *        the "right thing" we'll optimize it for efficiency if
1085          *        necessary */
1086
1087         /* Search for this entry in the list and update it if it is
1088          * already there. */
1089
1090         spin_lock_irqsave(&ieee->lock, flags);
1091
1092         list_for_each_entry(target, &ieee->network_list, list) {
1093                 if (is_same_network(target, &network))
1094                         break;
1095
1096                 if ((oldest == NULL) ||
1097                     (target->last_scanned < oldest->last_scanned))
1098                         oldest = target;
1099         }
1100
1101         /* If we didn't find a match, then get a new network slot to initialize
1102          * with this beacon's information */
1103         if (&target->list == &ieee->network_list) {
1104                 if (list_empty(&ieee->network_free_list)) {
1105                         /* If there are no more slots, expire the oldest */
1106                         list_del(&oldest->list);
1107                         target = oldest;
1108                         IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1109                                              "network list.\n",
1110                                              escape_essid(target->ssid,
1111                                                           target->ssid_len),
1112                                              MAC_ARG(target->bssid));
1113                 } else {
1114                         /* Otherwise just pull from the free list */
1115                         target = list_entry(ieee->network_free_list.next,
1116                                             struct ieee80211_network, list);
1117                         list_del(ieee->network_free_list.next);
1118                 }
1119
1120 #ifdef CONFIG_IEEE80211_DEBUG
1121                 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1122                                      escape_essid(network.ssid,
1123                                                   network.ssid_len),
1124                                      MAC_ARG(network.bssid),
1125                                      WLAN_FC_GET_STYPE(beacon->header.
1126                                                        frame_ctl) ==
1127                                      IEEE80211_STYPE_PROBE_RESP ?
1128                                      "PROBE RESPONSE" : "BEACON");
1129 #endif
1130                 memcpy(target, &network, sizeof(*target));
1131                 list_add_tail(&target->list, &ieee->network_list);
1132         } else {
1133                 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1134                                      escape_essid(target->ssid,
1135                                                   target->ssid_len),
1136                                      MAC_ARG(target->bssid),
1137                                      WLAN_FC_GET_STYPE(beacon->header.
1138                                                        frame_ctl) ==
1139                                      IEEE80211_STYPE_PROBE_RESP ?
1140                                      "PROBE RESPONSE" : "BEACON");
1141                 update_network(target, &network);
1142         }
1143
1144         spin_unlock_irqrestore(&ieee->lock, flags);
1145 }
1146
1147 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1148                       struct ieee80211_hdr *header,
1149                       struct ieee80211_rx_stats *stats)
1150 {
1151         switch (WLAN_FC_GET_STYPE(header->frame_ctl)) {
1152         case IEEE80211_STYPE_ASSOC_RESP:
1153                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1154                                      WLAN_FC_GET_STYPE(header->frame_ctl));
1155                 break;
1156
1157         case IEEE80211_STYPE_REASSOC_RESP:
1158                 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1159                                      WLAN_FC_GET_STYPE(header->frame_ctl));
1160                 break;
1161
1162         case IEEE80211_STYPE_PROBE_RESP:
1163                 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1164                                      WLAN_FC_GET_STYPE(header->frame_ctl));
1165                 IEEE80211_DEBUG_SCAN("Probe response\n");
1166                 ieee80211_process_probe_response(ieee,
1167                                                  (struct
1168                                                   ieee80211_probe_response *)
1169                                                  header, stats);
1170                 break;
1171
1172         case IEEE80211_STYPE_BEACON:
1173                 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1174                                      WLAN_FC_GET_STYPE(header->frame_ctl));
1175                 IEEE80211_DEBUG_SCAN("Beacon\n");
1176                 ieee80211_process_probe_response(ieee,
1177                                                  (struct
1178                                                   ieee80211_probe_response *)
1179                                                  header, stats);
1180                 break;
1181
1182         default:
1183                 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1184                                      WLAN_FC_GET_STYPE(header->frame_ctl));
1185                 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1186                                   ieee->dev->name,
1187                                   WLAN_FC_GET_STYPE(header->frame_ctl));
1188                 break;
1189         }
1190 }
1191
1192 EXPORT_SYMBOL(ieee80211_rx_mgt);
1193 EXPORT_SYMBOL(ieee80211_rx);