net/ieee80211/ieee80211_rx.c

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