net/ieee80211/ieee80211_rx.c

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