git.oblomov.eu Git - linux-2.6/blob - net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/kernel.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/rcupdate.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20
  21 #include "ieee80211_i.h"
  22 #include "led.h"
  23 #include "mesh.h"
  24 #include "wep.h"
  25 #include "wpa.h"
  26 #include "tkip.h"
  27 #include "wme.h"
  28
  29 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
  30                                 struct tid_ampdu_rx *tid_agg_rx,
  31                                 struct sk_buff *skb, u16 mpdu_seq_num,
  32                                 int bar_req);
  33 /*
  34  * monitor mode reception
  35  *
  36  * This function cleans up the SKB, i.e. it removes all the stuff
  37  * only useful for monitoring.
  38  */
  39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  40                                            struct sk_buff *skb,
  41                                            int rtap_len)
  42 {
  43         skb_pull(skb, rtap_len);
  44
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         skb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         skb = NULL;
  53                 }
  54         }
  55
  56         return skb;
  57 }
  58
  59 static inline int should_drop_frame(struct ieee80211_rx_status *status,
  60                                     struct sk_buff *skb,
  61                                     int present_fcs_len,
  62                                     int radiotap_len)
  63 {
  64         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  65
  66         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
  67                 return 1;
  68         if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
  69                 return 1;
  70         if (ieee80211_is_ctl(hdr->frame_control) &&
  71             !ieee80211_is_pspoll(hdr->frame_control) &&
  72             !ieee80211_is_back_req(hdr->frame_control))
  73                 return 1;
  74         return 0;
  75 }
  76
  77 static int
  78 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
  79                           struct ieee80211_rx_status *status)
  80 {
  81         int len;
  82
  83         /* always present fields */
  84         len = sizeof(struct ieee80211_radiotap_header) + 9;
  85
  86         if (status->flag & RX_FLAG_TSFT)
  87                 len += 8;
  88         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
  89             local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  90                 len += 1;
  91         if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
  92                 len += 1;
  93
  94         if (len & 1) /* padding for RX_FLAGS if necessary */
  95                 len++;
  96
  97         /* make sure radiotap starts at a naturally aligned address */
  98         if (len % 8)
  99                 len = roundup(len, 8);
 100
 101         return len;
 102 }
 103
 104 /**
 105  * ieee80211_add_rx_radiotap_header - add radiotap header
 106  *
 107  * add a radiotap header containing all the fields which the hardware provided.
 108  */
 109 static void
 110 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 111                                  struct sk_buff *skb,
 112                                  struct ieee80211_rx_status *status,
 113                                  struct ieee80211_rate *rate,
 114                                  int rtap_len)
 115 {
 116         struct ieee80211_radiotap_header *rthdr;
 117         unsigned char *pos;
 118
 119         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 120         memset(rthdr, 0, rtap_len);
 121
 122         /* radiotap header, set always present flags */
 123         rthdr->it_present =
 124                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 125                             (1 << IEEE80211_RADIOTAP_RATE) |
 126                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 127                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
 128                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 129         rthdr->it_len = cpu_to_le16(rtap_len);
 130
 131         pos = (unsigned char *)(rthdr+1);
 132
 133         /* the order of the following fields is important */
 134
 135         /* IEEE80211_RADIOTAP_TSFT */
 136         if (status->flag & RX_FLAG_TSFT) {
 137                 *(__le64 *)pos = cpu_to_le64(status->mactime);
 138                 rthdr->it_present |=
 139                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 140                 pos += 8;
 141         }
 142
 143         /* IEEE80211_RADIOTAP_FLAGS */
 144         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 145                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 146         if (status->flag & RX_FLAG_SHORTPRE)
 147                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 148         pos++;
 149
 150         /* IEEE80211_RADIOTAP_RATE */
 151         *pos = rate->bitrate / 5;
 152         pos++;
 153
 154         /* IEEE80211_RADIOTAP_CHANNEL */
 155         *(__le16 *)pos = cpu_to_le16(status->freq);
 156         pos += 2;
 157         if (status->band == IEEE80211_BAND_5GHZ)
 158                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
 159                                              IEEE80211_CHAN_5GHZ);
 160         else
 161                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
 162                                              IEEE80211_CHAN_2GHZ);
 163         pos += 2;
 164
 165         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 166         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
 167                 *pos = status->signal;
 168                 rthdr->it_present |=
 169                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 170                 pos++;
 171         }
 172
 173         /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
 174         if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
 175                 *pos = status->noise;
 176                 rthdr->it_present |=
 177                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
 178                 pos++;
 179         }
 180
 181         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 182
 183         /* IEEE80211_RADIOTAP_ANTENNA */
 184         *pos = status->antenna;
 185         pos++;
 186
 187         /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
 188         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
 189                 *pos = status->signal;
 190                 rthdr->it_present |=
 191                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
 192                 pos++;
 193         }
 194
 195         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 196
 197         /* IEEE80211_RADIOTAP_RX_FLAGS */
 198         /* ensure 2 byte alignment for the 2 byte field as required */
 199         if ((pos - (unsigned char *)rthdr) & 1)
 200                 pos++;
 201         /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
 202         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 203                 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
 204         pos += 2;
 205 }
 206
 207 /*
 208  * This function copies a received frame to all monitor interfaces and
 209  * returns a cleaned-up SKB that no longer includes the FCS nor the
 210  * radiotap header the driver might have added.
 211  */
 212 static struct sk_buff *
 213 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 214                      struct ieee80211_rx_status *status,
 215                      struct ieee80211_rate *rate)
 216 {
 217         struct ieee80211_sub_if_data *sdata;
 218         int needed_headroom = 0;
 219         struct sk_buff *skb, *skb2;
 220         struct net_device *prev_dev = NULL;
 221         int present_fcs_len = 0;
 222         int rtap_len = 0;
 223
 224         /*
 225          * First, we may need to make a copy of the skb because
 226          *  (1) we need to modify it for radiotap (if not present), and
 227          *  (2) the other RX handlers will modify the skb we got.
 228          *
 229          * We don't need to, of course, if we aren't going to return
 230          * the SKB because it has a bad FCS/PLCP checksum.
 231          */
 232         if (status->flag & RX_FLAG_RADIOTAP)
 233                 rtap_len = ieee80211_get_radiotap_len(origskb->data);
 234         else
 235                 /* room for the radiotap header based on driver features */
 236                 needed_headroom = ieee80211_rx_radiotap_len(local, status);
 237
 238         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 239                 present_fcs_len = FCS_LEN;
 240
 241         if (!local->monitors) {
 242                 if (should_drop_frame(status, origskb, present_fcs_len,
 243                                       rtap_len)) {
 244                         dev_kfree_skb(origskb);
 245                         return NULL;
 246                 }
 247
 248                 return remove_monitor_info(local, origskb, rtap_len);
 249         }
 250
 251         if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
 252                 /* only need to expand headroom if necessary */
 253                 skb = origskb;
 254                 origskb = NULL;
 255
 256                 /*
 257                  * This shouldn't trigger often because most devices have an
 258                  * RX header they pull before we get here, and that should
 259                  * be big enough for our radiotap information. We should
 260                  * probably export the length to drivers so that we can have
 261                  * them allocate enough headroom to start with.
 262                  */
 263                 if (skb_headroom(skb) < needed_headroom &&
 264                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 265                         dev_kfree_skb(skb);
 266                         return NULL;
 267                 }
 268         } else {
 269                 /*
 270                  * Need to make a copy and possibly remove radiotap header
 271                  * and FCS from the original.
 272                  */
 273                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 274
 275                 origskb = remove_monitor_info(local, origskb, rtap_len);
 276
 277                 if (!skb)
 278                         return origskb;
 279         }
 280
 281         /* if necessary, prepend radiotap information */
 282         if (!(status->flag & RX_FLAG_RADIOTAP))
 283                 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
 284                                                  needed_headroom);
 285
 286         skb_reset_mac_header(skb);
 287         skb->ip_summed = CHECKSUM_UNNECESSARY;
 288         skb->pkt_type = PACKET_OTHERHOST;
 289         skb->protocol = htons(ETH_P_802_2);
 290
 291         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 292                 if (!netif_running(sdata->dev))
 293                         continue;
 294
 295                 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
 296                         continue;
 297
 298                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 299                         continue;
 300
 301                 if (prev_dev) {
 302                         skb2 = skb_clone(skb, GFP_ATOMIC);
 303                         if (skb2) {
 304                                 skb2->dev = prev_dev;
 305                                 netif_rx(skb2);
 306                         }
 307                 }
 308
 309                 prev_dev = sdata->dev;
 310                 sdata->dev->stats.rx_packets++;
 311                 sdata->dev->stats.rx_bytes += skb->len;
 312         }
 313
 314         if (prev_dev) {
 315                 skb->dev = prev_dev;
 316                 netif_rx(skb);
 317         } else
 318                 dev_kfree_skb(skb);
 319
 320         return origskb;
 321 }
 322
 323
 324 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 325 {
 326         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 327         int tid;
 328
 329         /* does the frame have a qos control field? */
 330         if (ieee80211_is_data_qos(hdr->frame_control)) {
 331                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 332                 /* frame has qos control */
 333                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 334                 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
 335                         rx->flags |= IEEE80211_RX_AMSDU;
 336                 else
 337                         rx->flags &= ~IEEE80211_RX_AMSDU;
 338         } else {
 339                 /*
 340                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 341                  *
 342                  *      Sequence numbers for management frames, QoS data
 343                  *      frames with a broadcast/multicast address in the
 344                  *      Address 1 field, and all non-QoS data frames sent
 345                  *      by QoS STAs are assigned using an additional single
 346                  *      modulo-4096 counter, [...]
 347                  *
 348                  * We also use that counter for non-QoS STAs.
 349                  */
 350                 tid = NUM_RX_DATA_QUEUES - 1;
 351         }
 352
 353         rx->queue = tid;
 354         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 355          * For now, set skb->priority to 0 for other cases. */
 356         rx->skb->priority = (tid > 7) ? 0 : tid;
 357 }
 358
 359 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
 360 {
 361 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
 362         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 363         int hdrlen;
 364
 365         if (!ieee80211_is_data_present(hdr->frame_control))
 366                 return;
 367
 368         /*
 369          * Drivers are required to align the payload data in a way that
 370          * guarantees that the contained IP header is aligned to a four-
 371          * byte boundary. In the case of regular frames, this simply means
 372          * aligning the payload to a four-byte boundary (because either
 373          * the IP header is directly contained, or IV/RFC1042 headers that
 374          * have a length divisible by four are in front of it.
 375          *
 376          * With A-MSDU frames, however, the payload data address must
 377          * yield two modulo four because there are 14-byte 802.3 headers
 378          * within the A-MSDU frames that push the IP header further back
 379          * to a multiple of four again. Thankfully, the specs were sane
 380          * enough this time around to require padding each A-MSDU subframe
 381          * to a length that is a multiple of four.
 382          *
 383          * Padding like atheros hardware adds which is inbetween the 802.11
 384          * header and the payload is not supported, the driver is required
 385          * to move the 802.11 header further back in that case.
 386          */
 387         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 388         if (rx->flags & IEEE80211_RX_AMSDU)
 389                 hdrlen += ETH_HLEN;
 390         WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
 391 #endif
 392 }
 393
 394
 395 /* rx handlers */
 396
 397 static ieee80211_rx_result debug_noinline
 398 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
 399 {
 400         struct ieee80211_local *local = rx->local;
 401         struct sk_buff *skb = rx->skb;
 402
 403         if (unlikely(local->sta_hw_scanning))
 404                 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
 405
 406         if (unlikely(local->sta_sw_scanning)) {
 407                 /* drop all the other packets during a software scan anyway */
 408                 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
 409                     != RX_QUEUED)
 410                         dev_kfree_skb(skb);
 411                 return RX_QUEUED;
 412         }
 413
 414         if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
 415                 /* scanning finished during invoking of handlers */
 416                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 417                 return RX_DROP_UNUSABLE;
 418         }
 419
 420         return RX_CONTINUE;
 421 }
 422
 423 static ieee80211_rx_result
 424 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 425 {
 426         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 427         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 428
 429         if (ieee80211_is_data(hdr->frame_control)) {
 430                 if (!ieee80211_has_a4(hdr->frame_control))
 431                         return RX_DROP_MONITOR;
 432                 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
 433                         return RX_DROP_MONITOR;
 434         }
 435
 436         /* If there is not an established peer link and this is not a peer link
 437          * establisment frame, beacon or probe, drop the frame.
 438          */
 439
 440         if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
 441                 struct ieee80211_mgmt *mgmt;
 442
 443                 if (!ieee80211_is_mgmt(hdr->frame_control))
 444                         return RX_DROP_MONITOR;
 445
 446                 if (ieee80211_is_action(hdr->frame_control)) {
 447                         mgmt = (struct ieee80211_mgmt *)hdr;
 448                         if (mgmt->u.action.category != PLINK_CATEGORY)
 449                                 return RX_DROP_MONITOR;
 450                         return RX_CONTINUE;
 451                 }
 452
 453                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 454                     ieee80211_is_probe_resp(hdr->frame_control) ||
 455                     ieee80211_is_beacon(hdr->frame_control))
 456                         return RX_CONTINUE;
 457
 458                 return RX_DROP_MONITOR;
 459
 460         }
 461
 462 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
 463
 464         if (ieee80211_is_data(hdr->frame_control) &&
 465             is_multicast_ether_addr(hdr->addr1) &&
 466             mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
 467                 return RX_DROP_MONITOR;
 468 #undef msh_h_get
 469
 470         return RX_CONTINUE;
 471 }
 472
 473
 474 static ieee80211_rx_result debug_noinline
 475 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 476 {
 477         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 478
 479         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 480         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 481                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 482                              rx->sta->last_seq_ctrl[rx->queue] ==
 483                              hdr->seq_ctrl)) {
 484                         if (rx->flags & IEEE80211_RX_RA_MATCH) {
 485                                 rx->local->dot11FrameDuplicateCount++;
 486                                 rx->sta->num_duplicates++;
 487                         }
 488                         return RX_DROP_MONITOR;
 489                 } else
 490                         rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
 491         }
 492
 493         if (unlikely(rx->skb->len < 16)) {
 494                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 495                 return RX_DROP_MONITOR;
 496         }
 497
 498         /* Drop disallowed frame classes based on STA auth/assoc state;
 499          * IEEE 802.11, Chap 5.5.
 500          *
 501          * 80211.o does filtering only based on association state, i.e., it
 502          * drops Class 3 frames from not associated stations. hostapd sends
 503          * deauth/disassoc frames when needed. In addition, hostapd is
 504          * responsible for filtering on both auth and assoc states.
 505          */
 506
 507         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 508                 return ieee80211_rx_mesh_check(rx);
 509
 510         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 511                       ieee80211_is_pspoll(hdr->frame_control)) &&
 512                      rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
 513                      (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
 514                 if ((!ieee80211_has_fromds(hdr->frame_control) &&
 515                      !ieee80211_has_tods(hdr->frame_control) &&
 516                      ieee80211_is_data(hdr->frame_control)) ||
 517                     !(rx->flags & IEEE80211_RX_RA_MATCH)) {
 518                         /* Drop IBSS frames and frames for other hosts
 519                          * silently. */
 520                         return RX_DROP_MONITOR;
 521                 }
 522
 523                 return RX_DROP_MONITOR;
 524         }
 525
 526         return RX_CONTINUE;
 527 }
 528
 529
 530 static ieee80211_rx_result debug_noinline
 531 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
 532 {
 533         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 534         int keyidx;
 535         int hdrlen;
 536         ieee80211_rx_result result = RX_DROP_UNUSABLE;
 537         struct ieee80211_key *stakey = NULL;
 538
 539         /*
 540          * Key selection 101
 541          *
 542          * There are three types of keys:
 543          *  - GTK (group keys)
 544          *  - PTK (pairwise keys)
 545          *  - STK (station-to-station pairwise keys)
 546          *
 547          * When selecting a key, we have to distinguish between multicast
 548          * (including broadcast) and unicast frames, the latter can only
 549          * use PTKs and STKs while the former always use GTKs. Unless, of
 550          * course, actual WEP keys ("pre-RSNA") are used, then unicast
 551          * frames can also use key indizes like GTKs. Hence, if we don't
 552          * have a PTK/STK we check the key index for a WEP key.
 553          *
 554          * Note that in a regular BSS, multicast frames are sent by the
 555          * AP only, associated stations unicast the frame to the AP first
 556          * which then multicasts it on their behalf.
 557          *
 558          * There is also a slight problem in IBSS mode: GTKs are negotiated
 559          * with each station, that is something we don't currently handle.
 560          * The spec seems to expect that one negotiates the same key with
 561          * every station but there's no such requirement; VLANs could be
 562          * possible.
 563          */
 564
 565         if (!ieee80211_has_protected(hdr->frame_control))
 566                 return RX_CONTINUE;
 567
 568         /*
 569          * No point in finding a key and decrypting if the frame is neither
 570          * addressed to us nor a multicast frame.
 571          */
 572         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
 573                 return RX_CONTINUE;
 574
 575         if (rx->sta)
 576                 stakey = rcu_dereference(rx->sta->key);
 577
 578         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
 579                 rx->key = stakey;
 580         } else {
 581                 /*
 582                  * The device doesn't give us the IV so we won't be
 583                  * able to look up the key. That's ok though, we
 584                  * don't need to decrypt the frame, we just won't
 585                  * be able to keep statistics accurate.
 586                  * Except for key threshold notifications, should
 587                  * we somehow allow the driver to tell us which key
 588                  * the hardware used if this flag is set?
 589                  */
 590                 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
 591                     (rx->status->flag & RX_FLAG_IV_STRIPPED))
 592                         return RX_CONTINUE;
 593
 594                 hdrlen = ieee80211_hdrlen(hdr->frame_control);
 595
 596                 if (rx->skb->len < 8 + hdrlen)
 597                         return RX_DROP_UNUSABLE; /* TODO: count this? */
 598
 599                 /*
 600                  * no need to call ieee80211_wep_get_keyidx,
 601                  * it verifies a bunch of things we've done already
 602                  */
 603                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
 604
 605                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
 606
 607                 /*
 608                  * RSNA-protected unicast frames should always be sent with
 609                  * pairwise or station-to-station keys, but for WEP we allow
 610                  * using a key index as well.
 611                  */
 612                 if (rx->key && rx->key->conf.alg != ALG_WEP &&
 613                     !is_multicast_ether_addr(hdr->addr1))
 614                         rx->key = NULL;
 615         }
 616
 617         if (rx->key) {
 618                 rx->key->tx_rx_count++;
 619                 /* TODO: add threshold stuff again */
 620         } else {
 621                 return RX_DROP_MONITOR;
 622         }
 623
 624         /* Check for weak IVs if possible */
 625         if (rx->sta && rx->key->conf.alg == ALG_WEP &&
 626             ieee80211_is_data(hdr->frame_control) &&
 627             (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
 628              !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
 629             ieee80211_wep_is_weak_iv(rx->skb, rx->key))
 630                 rx->sta->wep_weak_iv_count++;
 631
 632         switch (rx->key->conf.alg) {
 633         case ALG_WEP:
 634                 result = ieee80211_crypto_wep_decrypt(rx);
 635                 break;
 636         case ALG_TKIP:
 637                 result = ieee80211_crypto_tkip_decrypt(rx);
 638                 break;
 639         case ALG_CCMP:
 640                 result = ieee80211_crypto_ccmp_decrypt(rx);
 641                 break;
 642         }
 643
 644         /* either the frame has been decrypted or will be dropped */
 645         rx->status->flag |= RX_FLAG_DECRYPTED;
 646
 647         return result;
 648 }
 649
 650 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
 651 {
 652         struct ieee80211_sub_if_data *sdata;
 653         DECLARE_MAC_BUF(mac);
 654
 655         sdata = sta->sdata;
 656
 657         atomic_inc(&sdata->bss->num_sta_ps);
 658         set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
 659 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 660         printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
 661                dev->name, print_mac(mac, sta->addr), sta->aid);
 662 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 663 }
 664
 665 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 666 {
 667         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 668         struct sk_buff *skb;
 669         int sent = 0;
 670         struct ieee80211_sub_if_data *sdata;
 671         struct ieee80211_tx_info *info;
 672         DECLARE_MAC_BUF(mac);
 673
 674         sdata = sta->sdata;
 675
 676         atomic_dec(&sdata->bss->num_sta_ps);
 677
 678         clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
 679
 680         if (!skb_queue_empty(&sta->ps_tx_buf))
 681                 sta_info_clear_tim_bit(sta);
 682
 683 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 684         printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
 685                dev->name, print_mac(mac, sta->addr), sta->aid);
 686 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 687
 688         /* Send all buffered frames to the station */
 689         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
 690                 info = IEEE80211_SKB_CB(skb);
 691                 sent++;
 692                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 693                 dev_queue_xmit(skb);
 694         }
 695         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
 696                 info = IEEE80211_SKB_CB(skb);
 697                 local->total_ps_buffered--;
 698                 sent++;
 699 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
 700                 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
 701                        "since STA not sleeping anymore\n", dev->name,
 702                        print_mac(mac, sta->addr), sta->aid);
 703 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
 704                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 705                 dev_queue_xmit(skb);
 706         }
 707
 708         return sent;
 709 }
 710
 711 static ieee80211_rx_result debug_noinline
 712 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
 713 {
 714         struct sta_info *sta = rx->sta;
 715         struct net_device *dev = rx->dev;
 716         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 717
 718         if (!sta)
 719                 return RX_CONTINUE;
 720
 721         /* Update last_rx only for IBSS packets which are for the current
 722          * BSSID to avoid keeping the current IBSS network alive in cases where
 723          * other STAs are using different BSSID. */
 724         if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 725                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
 726                                                 IEEE80211_IF_TYPE_IBSS);
 727                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
 728                         sta->last_rx = jiffies;
 729         } else
 730         if (!is_multicast_ether_addr(hdr->addr1) ||
 731             rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
 732                 /* Update last_rx only for unicast frames in order to prevent
 733                  * the Probe Request frames (the only broadcast frames from a
 734                  * STA in infrastructure mode) from keeping a connection alive.
 735                  * Mesh beacons will update last_rx when if they are found to
 736                  * match the current local configuration when processed.
 737                  */
 738                 sta->last_rx = jiffies;
 739         }
 740
 741         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
 742                 return RX_CONTINUE;
 743
 744         sta->rx_fragments++;
 745         sta->rx_bytes += rx->skb->len;
 746         sta->last_signal = rx->status->signal;
 747         sta->last_qual = rx->status->qual;
 748         sta->last_noise = rx->status->noise;
 749
 750         if (!ieee80211_has_morefrags(hdr->frame_control) &&
 751             (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
 752              rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
 753                 /* Change STA power saving mode only in the end of a frame
 754                  * exchange sequence */
 755                 if (test_sta_flags(sta, WLAN_STA_PS) &&
 756                     !ieee80211_has_pm(hdr->frame_control))
 757                         rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
 758                 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
 759                          ieee80211_has_pm(hdr->frame_control))
 760                         ap_sta_ps_start(dev, sta);
 761         }
 762
 763         /* Drop data::nullfunc frames silently, since they are used only to
 764          * control station power saving mode. */
 765         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 766                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
 767                 /* Update counter and free packet here to avoid counting this
 768                  * as a dropped packed. */
 769                 sta->rx_packets++;
 770                 dev_kfree_skb(rx->skb);
 771                 return RX_QUEUED;
 772         }
 773
 774         return RX_CONTINUE;
 775 } /* ieee80211_rx_h_sta_process */
 776
 777 static inline struct ieee80211_fragment_entry *
 778 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 779                          unsigned int frag, unsigned int seq, int rx_queue,
 780                          struct sk_buff **skb)
 781 {
 782         struct ieee80211_fragment_entry *entry;
 783         int idx;
 784
 785         idx = sdata->fragment_next;
 786         entry = &sdata->fragments[sdata->fragment_next++];
 787         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
 788                 sdata->fragment_next = 0;
 789
 790         if (!skb_queue_empty(&entry->skb_list)) {
 791 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 792                 struct ieee80211_hdr *hdr =
 793                         (struct ieee80211_hdr *) entry->skb_list.next->data;
 794                 DECLARE_MAC_BUF(mac);
 795                 DECLARE_MAC_BUF(mac2);
 796                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
 797                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
 798                        "addr1=%s addr2=%s\n",
 799                        sdata->dev->name, idx,
 800                        jiffies - entry->first_frag_time, entry->seq,
 801                        entry->last_frag, print_mac(mac, hdr->addr1),
 802                        print_mac(mac2, hdr->addr2));
 803 #endif
 804                 __skb_queue_purge(&entry->skb_list);
 805         }
 806
 807         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
 808         *skb = NULL;
 809         entry->first_frag_time = jiffies;
 810         entry->seq = seq;
 811         entry->rx_queue = rx_queue;
 812         entry->last_frag = frag;
 813         entry->ccmp = 0;
 814         entry->extra_len = 0;
 815
 816         return entry;
 817 }
 818
 819 static inline struct ieee80211_fragment_entry *
 820 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 821                           u16 fc, unsigned int frag, unsigned int seq,
 822                           int rx_queue, struct ieee80211_hdr *hdr)
 823 {
 824         struct ieee80211_fragment_entry *entry;
 825         int i, idx;
 826
 827         idx = sdata->fragment_next;
 828         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 829                 struct ieee80211_hdr *f_hdr;
 830                 u16 f_fc;
 831
 832                 idx--;
 833                 if (idx < 0)
 834                         idx = IEEE80211_FRAGMENT_MAX - 1;
 835
 836                 entry = &sdata->fragments[idx];
 837                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
 838                     entry->rx_queue != rx_queue ||
 839                     entry->last_frag + 1 != frag)
 840                         continue;
 841
 842                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
 843                 f_fc = le16_to_cpu(f_hdr->frame_control);
 844
 845                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
 846                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
 847                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
 848                         continue;
 849
 850                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
 851                         __skb_queue_purge(&entry->skb_list);
 852                         continue;
 853                 }
 854                 return entry;
 855         }
 856
 857         return NULL;
 858 }
 859
 860 static ieee80211_rx_result debug_noinline
 861 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 862 {
 863         struct ieee80211_hdr *hdr;
 864         u16 sc;
 865         unsigned int frag, seq;
 866         struct ieee80211_fragment_entry *entry;
 867         struct sk_buff *skb;
 868         DECLARE_MAC_BUF(mac);
 869
 870         hdr = (struct ieee80211_hdr *) rx->skb->data;
 871         sc = le16_to_cpu(hdr->seq_ctrl);
 872         frag = sc & IEEE80211_SCTL_FRAG;
 873
 874         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
 875                    (rx->skb)->len < 24 ||
 876                    is_multicast_ether_addr(hdr->addr1))) {
 877                 /* not fragmented */
 878                 goto out;
 879         }
 880         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 881
 882         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
 883
 884         if (frag == 0) {
 885                 /* This is the first fragment of a new frame. */
 886                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
 887                                                  rx->queue, &(rx->skb));
 888                 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
 889                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
 890                         /* Store CCMP PN so that we can verify that the next
 891                          * fragment has a sequential PN value. */
 892                         entry->ccmp = 1;
 893                         memcpy(entry->last_pn,
 894                                rx->key->u.ccmp.rx_pn[rx->queue],
 895                                CCMP_PN_LEN);
 896                 }
 897                 return RX_QUEUED;
 898         }
 899
 900         /* This is a fragment for a frame that should already be pending in
 901          * fragment cache. Add this fragment to the end of the pending entry.
 902          */
 903         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
 904                                           rx->queue, hdr);
 905         if (!entry) {
 906                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 907                 return RX_DROP_MONITOR;
 908         }
 909
 910         /* Verify that MPDUs within one MSDU have sequential PN values.
 911          * (IEEE 802.11i, 8.3.3.4.5) */
 912         if (entry->ccmp) {
 913                 int i;
 914                 u8 pn[CCMP_PN_LEN], *rpn;
 915                 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
 916                         return RX_DROP_UNUSABLE;
 917                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 918                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 919                         pn[i]++;
 920                         if (pn[i])
 921                                 break;
 922                 }
 923                 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
 924                 if (memcmp(pn, rpn, CCMP_PN_LEN))
 925                         return RX_DROP_UNUSABLE;
 926                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 927         }
 928
 929         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
 930         __skb_queue_tail(&entry->skb_list, rx->skb);
 931         entry->last_frag = frag;
 932         entry->extra_len += rx->skb->len;
 933         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 934                 rx->skb = NULL;
 935                 return RX_QUEUED;
 936         }
 937
 938         rx->skb = __skb_dequeue(&entry->skb_list);
 939         if (skb_tailroom(rx->skb) < entry->extra_len) {
 940                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
 941                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
 942                                               GFP_ATOMIC))) {
 943                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 944                         __skb_queue_purge(&entry->skb_list);
 945                         return RX_DROP_UNUSABLE;
 946                 }
 947         }
 948         while ((skb = __skb_dequeue(&entry->skb_list))) {
 949                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
 950                 dev_kfree_skb(skb);
 951         }
 952
 953         /* Complete frame has been reassembled - process it now */
 954         rx->flags |= IEEE80211_RX_FRAGMENTED;
 955
 956  out:
 957         if (rx->sta)
 958                 rx->sta->rx_packets++;
 959         if (is_multicast_ether_addr(hdr->addr1))
 960                 rx->local->dot11MulticastReceivedFrameCount++;
 961         else
 962                 ieee80211_led_rx(rx->local);
 963         return RX_CONTINUE;
 964 }
 965
 966 static ieee80211_rx_result debug_noinline
 967 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
 968 {
 969         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
 970         struct sk_buff *skb;
 971         int no_pending_pkts;
 972         DECLARE_MAC_BUF(mac);
 973
 974         if (likely(!rx->sta ||
 975                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 976                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 977                    !(rx->flags & IEEE80211_RX_RA_MATCH)))
 978                 return RX_CONTINUE;
 979
 980         if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
 981             (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
 982                 return RX_DROP_UNUSABLE;
 983
 984         skb = skb_dequeue(&rx->sta->tx_filtered);
 985         if (!skb) {
 986                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
 987                 if (skb)
 988                         rx->local->total_ps_buffered--;
 989         }
 990         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
 991                 skb_queue_empty(&rx->sta->ps_tx_buf);
 992
 993         if (skb) {
 994                 struct ieee80211_hdr *hdr =
 995                         (struct ieee80211_hdr *) skb->data;
 996
 997                 /*
 998                  * Tell TX path to send one frame even though the STA may
 999                  * still remain is PS mode after this frame exchange.
1000                  */
1001                 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1002
1003 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1004                 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1005                        print_mac(mac, rx->sta->addr), rx->sta->aid,
1006                        skb_queue_len(&rx->sta->ps_tx_buf));
1007 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1008
1009                 /* Use MoreData flag to indicate whether there are more
1010                  * buffered frames for this STA */
1011                 if (no_pending_pkts)
1012                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1013                 else
1014                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1015
1016                 dev_queue_xmit(skb);
1017
1018                 if (no_pending_pkts)
1019                         sta_info_clear_tim_bit(rx->sta);
1020 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1021         } else if (!rx->sent_ps_buffered) {
1022                 /*
1023                  * FIXME: This can be the result of a race condition between
1024                  *        us expiring a frame and the station polling for it.
1025                  *        Should we send it a null-func frame indicating we
1026                  *        have nothing buffered for it?
1027                  */
1028                 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1029                        "though there are no buffered frames for it\n",
1030                        rx->dev->name, print_mac(mac, rx->sta->addr));
1031 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1032         }
1033
1034         /* Free PS Poll skb here instead of returning RX_DROP that would
1035          * count as an dropped frame. */
1036         dev_kfree_skb(rx->skb);
1037
1038         return RX_QUEUED;
1039 }
1040
1041 static ieee80211_rx_result debug_noinline
1042 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1043 {
1044         u8 *data = rx->skb->data;
1045         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1046
1047         if (!ieee80211_is_data_qos(hdr->frame_control))
1048                 return RX_CONTINUE;
1049
1050         /* remove the qos control field, update frame type and meta-data */
1051         memmove(data + IEEE80211_QOS_CTL_LEN, data,
1052                 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1053         hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1054         /* change frame type to non QOS */
1055         rx->fc &= ~IEEE80211_STYPE_QOS_DATA;
1056         hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1057
1058         return RX_CONTINUE;
1059 }
1060
1061 static int
1062 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1063 {
1064         if (unlikely(!rx->sta ||
1065             !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1066                 return -EACCES;
1067
1068         return 0;
1069 }
1070
1071 static int
1072 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1073 {
1074         /*
1075          * Pass through unencrypted frames if the hardware has
1076          * decrypted them already.
1077          */
1078         if (rx->status->flag & RX_FLAG_DECRYPTED)
1079                 return 0;
1080
1081         /* Drop unencrypted frames if key is set. */
1082         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1083                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1084                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1085                      (rx->key || rx->sdata->drop_unencrypted)))
1086                 return -EACCES;
1087
1088         return 0;
1089 }
1090
1091 static int
1092 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1093 {
1094         struct net_device *dev = rx->dev;
1095         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1096         u16 fc, hdrlen, ethertype;
1097         u8 *payload;
1098         u8 dst[ETH_ALEN];
1099         u8 src[ETH_ALEN] __aligned(2);
1100         struct sk_buff *skb = rx->skb;
1101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1102         DECLARE_MAC_BUF(mac);
1103         DECLARE_MAC_BUF(mac2);
1104         DECLARE_MAC_BUF(mac3);
1105         DECLARE_MAC_BUF(mac4);
1106
1107         fc = rx->fc;
1108
1109         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1110                 return -1;
1111
1112         hdrlen = ieee80211_get_hdrlen(fc);
1113
1114         if (ieee80211_vif_is_mesh(&sdata->vif))
1115                 hdrlen += ieee80211_get_mesh_hdrlen(
1116                                 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1117
1118         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1119          * header
1120          * IEEE 802.11 address fields:
1121          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1122          *   0     0   DA    SA    BSSID n/a
1123          *   0     1   DA    BSSID SA    n/a
1124          *   1     0   BSSID SA    DA    n/a
1125          *   1     1   RA    TA    DA    SA
1126          */
1127
1128         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1129         case IEEE80211_FCTL_TODS:
1130                 /* BSSID SA DA */
1131                 memcpy(dst, hdr->addr3, ETH_ALEN);
1132                 memcpy(src, hdr->addr2, ETH_ALEN);
1133
1134                 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1135                              sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1136                         return -1;
1137                 break;
1138         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1139                 /* RA TA DA SA */
1140                 memcpy(dst, hdr->addr3, ETH_ALEN);
1141                 memcpy(src, hdr->addr4, ETH_ALEN);
1142
1143                  if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1144                              sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1145                         return -1;
1146                 break;
1147         case IEEE80211_FCTL_FROMDS:
1148                 /* DA BSSID SA */
1149                 memcpy(dst, hdr->addr1, ETH_ALEN);
1150                 memcpy(src, hdr->addr3, ETH_ALEN);
1151
1152                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1153                     (is_multicast_ether_addr(dst) &&
1154                      !compare_ether_addr(src, dev->dev_addr)))
1155                         return -1;
1156                 break;
1157         case 0:
1158                 /* DA SA BSSID */
1159                 memcpy(dst, hdr->addr1, ETH_ALEN);
1160                 memcpy(src, hdr->addr2, ETH_ALEN);
1161
1162                 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1163                         return -1;
1164                 break;
1165         }
1166
1167         if (unlikely(skb->len - hdrlen < 8))
1168                 return -1;
1169
1170         payload = skb->data + hdrlen;
1171         ethertype = (payload[6] << 8) | payload[7];
1172
1173         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1174                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1175                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1176                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1177                  * replace EtherType */
1178                 skb_pull(skb, hdrlen + 6);
1179                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1180                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1181         } else {
1182                 struct ethhdr *ehdr;
1183                 __be16 len;
1184
1185                 skb_pull(skb, hdrlen);
1186                 len = htons(skb->len);
1187                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1188                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1189                 memcpy(ehdr->h_source, src, ETH_ALEN);
1190                 ehdr->h_proto = len;
1191         }
1192         return 0;
1193 }
1194
1195 /*
1196  * requires that rx->skb is a frame with ethernet header
1197  */
1198 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1199 {
1200         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1201                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1202         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1203
1204         /*
1205          * Allow EAPOL frames to us/the PAE group address regardless
1206          * of whether the frame was encrypted or not.
1207          */
1208         if (ehdr->h_proto == htons(ETH_P_PAE) &&
1209             (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1210              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1211                 return true;
1212
1213         if (ieee80211_802_1x_port_control(rx) ||
1214             ieee80211_drop_unencrypted(rx))
1215                 return false;
1216
1217         return true;
1218 }
1219
1220 /*
1221  * requires that rx->skb is a frame with ethernet header
1222  */
1223 static void
1224 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1225 {
1226         struct net_device *dev = rx->dev;
1227         struct ieee80211_local *local = rx->local;
1228         struct sk_buff *skb, *xmit_skb;
1229         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1230         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1231         struct sta_info *dsta;
1232
1233         skb = rx->skb;
1234         xmit_skb = NULL;
1235
1236         if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1237                                       sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1238             (rx->flags & IEEE80211_RX_RA_MATCH)) {
1239                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1240                         /*
1241                          * send multicast frames both to higher layers in
1242                          * local net stack and back to the wireless medium
1243                          */
1244                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1245                         if (!xmit_skb && net_ratelimit())
1246                                 printk(KERN_DEBUG "%s: failed to clone "
1247                                        "multicast frame\n", dev->name);
1248                 } else {
1249                         dsta = sta_info_get(local, skb->data);
1250                         if (dsta && dsta->sdata->dev == dev) {
1251                                 /*
1252                                  * The destination station is associated to
1253                                  * this AP (in this VLAN), so send the frame
1254                                  * directly to it and do not pass it to local
1255                                  * net stack.
1256                                  */
1257                                 xmit_skb = skb;
1258                                 skb = NULL;
1259                         }
1260                 }
1261         }
1262
1263         if (skb) {
1264                 /* deliver to local stack */
1265                 skb->protocol = eth_type_trans(skb, dev);
1266                 memset(skb->cb, 0, sizeof(skb->cb));
1267                 netif_rx(skb);
1268         }
1269
1270         if (xmit_skb) {
1271                 /* send to wireless media */
1272                 xmit_skb->protocol = htons(ETH_P_802_3);
1273                 skb_reset_network_header(xmit_skb);
1274                 skb_reset_mac_header(xmit_skb);
1275                 dev_queue_xmit(xmit_skb);
1276         }
1277 }
1278
1279 static ieee80211_rx_result debug_noinline
1280 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1281 {
1282         struct net_device *dev = rx->dev;
1283         struct ieee80211_local *local = rx->local;
1284         u16 fc, ethertype;
1285         u8 *payload;
1286         struct sk_buff *skb = rx->skb, *frame = NULL;
1287         const struct ethhdr *eth;
1288         int remaining, err;
1289         u8 dst[ETH_ALEN];
1290         u8 src[ETH_ALEN];
1291         DECLARE_MAC_BUF(mac);
1292
1293         fc = rx->fc;
1294         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1295                 return RX_CONTINUE;
1296
1297         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1298                 return RX_DROP_MONITOR;
1299
1300         if (!(rx->flags & IEEE80211_RX_AMSDU))
1301                 return RX_CONTINUE;
1302
1303         err = ieee80211_data_to_8023(rx);
1304         if (unlikely(err))
1305                 return RX_DROP_UNUSABLE;
1306
1307         skb->dev = dev;
1308
1309         dev->stats.rx_packets++;
1310         dev->stats.rx_bytes += skb->len;
1311
1312         /* skip the wrapping header */
1313         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1314         if (!eth)
1315                 return RX_DROP_UNUSABLE;
1316
1317         while (skb != frame) {
1318                 u8 padding;
1319                 __be16 len = eth->h_proto;
1320                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1321
1322                 remaining = skb->len;
1323                 memcpy(dst, eth->h_dest, ETH_ALEN);
1324                 memcpy(src, eth->h_source, ETH_ALEN);
1325
1326                 padding = ((4 - subframe_len) & 0x3);
1327                 /* the last MSDU has no padding */
1328                 if (subframe_len > remaining)
1329                         return RX_DROP_UNUSABLE;
1330
1331                 skb_pull(skb, sizeof(struct ethhdr));
1332                 /* if last subframe reuse skb */
1333                 if (remaining <= subframe_len + padding)
1334                         frame = skb;
1335                 else {
1336                         frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1337                                               subframe_len);
1338
1339                         if (frame == NULL)
1340                                 return RX_DROP_UNUSABLE;
1341
1342                         skb_reserve(frame, local->hw.extra_tx_headroom +
1343                                     sizeof(struct ethhdr));
1344                         memcpy(skb_put(frame, ntohs(len)), skb->data,
1345                                 ntohs(len));
1346
1347                         eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1348                                                         padding);
1349                         if (!eth) {
1350                                 dev_kfree_skb(frame);
1351                                 return RX_DROP_UNUSABLE;
1352                         }
1353                 }
1354
1355                 skb_reset_network_header(frame);
1356                 frame->dev = dev;
1357                 frame->priority = skb->priority;
1358                 rx->skb = frame;
1359
1360                 payload = frame->data;
1361                 ethertype = (payload[6] << 8) | payload[7];
1362
1363                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1364                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1365                            compare_ether_addr(payload,
1366                                               bridge_tunnel_header) == 0)) {
1367                         /* remove RFC1042 or Bridge-Tunnel
1368                          * encapsulation and replace EtherType */
1369                         skb_pull(frame, 6);
1370                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1371                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1372                 } else {
1373                         memcpy(skb_push(frame, sizeof(__be16)),
1374                                &len, sizeof(__be16));
1375                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1376                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1377                 }
1378
1379                 if (!ieee80211_frame_allowed(rx)) {
1380                         if (skb == frame) /* last frame */
1381                                 return RX_DROP_UNUSABLE;
1382                         dev_kfree_skb(frame);
1383                         continue;
1384                 }
1385
1386                 ieee80211_deliver_skb(rx);
1387         }
1388
1389         return RX_QUEUED;
1390 }
1391
1392 static ieee80211_rx_result debug_noinline
1393 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1394 {
1395         struct ieee80211_hdr *hdr;
1396         struct ieee80211s_hdr *mesh_hdr;
1397         unsigned int hdrlen;
1398         struct sk_buff *skb = rx->skb, *fwd_skb;
1399
1400         hdr = (struct ieee80211_hdr *) skb->data;
1401         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1402         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1403
1404         if (!ieee80211_is_data(hdr->frame_control))
1405                 return RX_CONTINUE;
1406
1407         if (!mesh_hdr->ttl)
1408                 /* illegal frame */
1409                 return RX_DROP_MONITOR;
1410
1411         if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1412                 return RX_CONTINUE;
1413
1414         mesh_hdr->ttl--;
1415
1416         if (rx->flags & IEEE80211_RX_RA_MATCH) {
1417                 if (!mesh_hdr->ttl)
1418                         IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta,
1419                                                      dropped_frames_ttl);
1420                 else {
1421                         struct ieee80211_hdr *fwd_hdr;
1422                         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1423
1424                         if (!fwd_skb && net_ratelimit())
1425                                 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1426                                                    rx->dev->name);
1427
1428                         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1429                         /*
1430                          * Save TA to addr1 to send TA a path error if a
1431                          * suitable next hop is not found
1432                          */
1433                         memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1434                         memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1435                         fwd_skb->dev = rx->local->mdev;
1436                         fwd_skb->iif = rx->dev->ifindex;
1437                         dev_queue_xmit(fwd_skb);
1438                 }
1439         }
1440
1441         if (is_multicast_ether_addr(hdr->addr3) ||
1442             rx->dev->flags & IFF_PROMISC)
1443                 return RX_CONTINUE;
1444         else
1445                 return RX_DROP_MONITOR;
1446 }
1447
1448
1449 static ieee80211_rx_result debug_noinline
1450 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1451 {
1452         struct net_device *dev = rx->dev;
1453         u16 fc;
1454         int err;
1455
1456         fc = rx->fc;
1457         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1458                 return RX_CONTINUE;
1459
1460         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1461                 return RX_DROP_MONITOR;
1462
1463         err = ieee80211_data_to_8023(rx);
1464         if (unlikely(err))
1465                 return RX_DROP_UNUSABLE;
1466
1467         if (!ieee80211_frame_allowed(rx))
1468                 return RX_DROP_MONITOR;
1469
1470         rx->skb->dev = dev;
1471
1472         dev->stats.rx_packets++;
1473         dev->stats.rx_bytes += rx->skb->len;
1474
1475         ieee80211_deliver_skb(rx);
1476
1477         return RX_QUEUED;
1478 }
1479
1480 static ieee80211_rx_result debug_noinline
1481 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1482 {
1483         struct ieee80211_local *local = rx->local;
1484         struct ieee80211_hw *hw = &local->hw;
1485         struct sk_buff *skb = rx->skb;
1486         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1487         struct tid_ampdu_rx *tid_agg_rx;
1488         u16 start_seq_num;
1489         u16 tid;
1490
1491         if (likely(!ieee80211_is_ctl(bar->frame_control)))
1492                 return RX_CONTINUE;
1493
1494         if (ieee80211_is_back_req(bar->frame_control)) {
1495                 if (!rx->sta)
1496                         return RX_CONTINUE;
1497                 tid = le16_to_cpu(bar->control) >> 12;
1498                 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1499                                         != HT_AGG_STATE_OPERATIONAL)
1500                         return RX_CONTINUE;
1501                 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1502
1503                 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1504
1505                 /* reset session timer */
1506                 if (tid_agg_rx->timeout) {
1507                         unsigned long expires =
1508                                 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1509                         mod_timer(&tid_agg_rx->session_timer, expires);
1510                 }
1511
1512                 /* manage reordering buffer according to requested */
1513                 /* sequence number */
1514                 rcu_read_lock();
1515                 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1516                                                  start_seq_num, 1);
1517                 rcu_read_unlock();
1518                 return RX_DROP_UNUSABLE;
1519         }
1520
1521         return RX_CONTINUE;
1522 }
1523
1524 static ieee80211_rx_result debug_noinline
1525 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1526 {
1527         struct ieee80211_sub_if_data *sdata;
1528
1529         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1530                 return RX_DROP_MONITOR;
1531
1532         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1533         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1534              sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1535              sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1536             !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1537                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1538         else
1539                 return RX_DROP_MONITOR;
1540
1541         return RX_QUEUED;
1542 }
1543
1544 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1545                                             struct ieee80211_hdr *hdr,
1546                                             struct ieee80211_rx_data *rx)
1547 {
1548         int keyidx;
1549         unsigned int hdrlen;
1550         DECLARE_MAC_BUF(mac);
1551         DECLARE_MAC_BUF(mac2);
1552
1553         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1554         if (rx->skb->len >= hdrlen + 4)
1555                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1556         else
1557                 keyidx = -1;
1558
1559         if (!rx->sta) {
1560                 /*
1561                  * Some hardware seem to generate incorrect Michael MIC
1562                  * reports; ignore them to avoid triggering countermeasures.
1563                  */
1564                 goto ignore;
1565         }
1566
1567         if (!ieee80211_has_protected(hdr->frame_control))
1568                 goto ignore;
1569
1570         if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1571                 /*
1572                  * APs with pairwise keys should never receive Michael MIC
1573                  * errors for non-zero keyidx because these are reserved for
1574                  * group keys and only the AP is sending real multicast
1575                  * frames in the BSS.
1576                  */
1577                 goto ignore;
1578         }
1579
1580         if (!ieee80211_is_data(hdr->frame_control) &&
1581             !ieee80211_is_auth(hdr->frame_control))
1582                 goto ignore;
1583
1584         mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1585  ignore:
1586         dev_kfree_skb(rx->skb);
1587         rx->skb = NULL;
1588 }
1589
1590 /* TODO: use IEEE80211_RX_FRAGMENTED */
1591 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1592 {
1593         struct ieee80211_sub_if_data *sdata;
1594         struct ieee80211_local *local = rx->local;
1595         struct ieee80211_rtap_hdr {
1596                 struct ieee80211_radiotap_header hdr;
1597                 u8 flags;
1598                 u8 rate;
1599                 __le16 chan_freq;
1600                 __le16 chan_flags;
1601         } __attribute__ ((packed)) *rthdr;
1602         struct sk_buff *skb = rx->skb, *skb2;
1603         struct net_device *prev_dev = NULL;
1604         struct ieee80211_rx_status *status = rx->status;
1605
1606         if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1607                 goto out_free_skb;
1608
1609         if (skb_headroom(skb) < sizeof(*rthdr) &&
1610             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1611                 goto out_free_skb;
1612
1613         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1614         memset(rthdr, 0, sizeof(*rthdr));
1615         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1616         rthdr->hdr.it_present =
1617                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1618                             (1 << IEEE80211_RADIOTAP_RATE) |
1619                             (1 << IEEE80211_RADIOTAP_CHANNEL));
1620
1621         rthdr->rate = rx->rate->bitrate / 5;
1622         rthdr->chan_freq = cpu_to_le16(status->freq);
1623
1624         if (status->band == IEEE80211_BAND_5GHZ)
1625                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1626                                                 IEEE80211_CHAN_5GHZ);
1627         else
1628                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1629                                                 IEEE80211_CHAN_2GHZ);
1630
1631         skb_set_mac_header(skb, 0);
1632         skb->ip_summed = CHECKSUM_UNNECESSARY;
1633         skb->pkt_type = PACKET_OTHERHOST;
1634         skb->protocol = htons(ETH_P_802_2);
1635
1636         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1637                 if (!netif_running(sdata->dev))
1638                         continue;
1639
1640                 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1641                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1642                         continue;
1643
1644                 if (prev_dev) {
1645                         skb2 = skb_clone(skb, GFP_ATOMIC);
1646                         if (skb2) {
1647                                 skb2->dev = prev_dev;
1648                                 netif_rx(skb2);
1649                         }
1650                 }
1651
1652                 prev_dev = sdata->dev;
1653                 sdata->dev->stats.rx_packets++;
1654                 sdata->dev->stats.rx_bytes += skb->len;
1655         }
1656
1657         if (prev_dev) {
1658                 skb->dev = prev_dev;
1659                 netif_rx(skb);
1660                 skb = NULL;
1661         } else
1662                 goto out_free_skb;
1663
1664         rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1665         return;
1666
1667  out_free_skb:
1668         dev_kfree_skb(skb);
1669 }
1670
1671
1672 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1673                                          struct ieee80211_rx_data *rx,
1674                                          struct sk_buff *skb)
1675 {
1676         ieee80211_rx_result res = RX_DROP_MONITOR;
1677
1678         rx->skb = skb;
1679         rx->sdata = sdata;
1680         rx->dev = sdata->dev;
1681
1682 #define CALL_RXH(rxh)                   \
1683         do {                            \
1684                 res = rxh(rx);          \
1685                 if (res != RX_CONTINUE) \
1686                         goto rxh_done;  \
1687         } while (0);
1688
1689         CALL_RXH(ieee80211_rx_h_passive_scan)
1690         CALL_RXH(ieee80211_rx_h_check)
1691         CALL_RXH(ieee80211_rx_h_decrypt)
1692         CALL_RXH(ieee80211_rx_h_sta_process)
1693         CALL_RXH(ieee80211_rx_h_defragment)
1694         CALL_RXH(ieee80211_rx_h_ps_poll)
1695         CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1696         /* must be after MMIC verify so header is counted in MPDU mic */
1697         CALL_RXH(ieee80211_rx_h_remove_qos_control)
1698         CALL_RXH(ieee80211_rx_h_amsdu)
1699         if (ieee80211_vif_is_mesh(&sdata->vif))
1700                 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1701         CALL_RXH(ieee80211_rx_h_data)
1702         CALL_RXH(ieee80211_rx_h_ctrl)
1703         CALL_RXH(ieee80211_rx_h_mgmt)
1704
1705 #undef CALL_RXH
1706
1707  rxh_done:
1708         switch (res) {
1709         case RX_DROP_MONITOR:
1710                 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1711                 if (rx->sta)
1712                         rx->sta->rx_dropped++;
1713                 /* fall through */
1714         case RX_CONTINUE:
1715                 ieee80211_rx_cooked_monitor(rx);
1716                 break;
1717         case RX_DROP_UNUSABLE:
1718                 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1719                 if (rx->sta)
1720                         rx->sta->rx_dropped++;
1721                 dev_kfree_skb(rx->skb);
1722                 break;
1723         case RX_QUEUED:
1724                 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1725                 break;
1726         }
1727 }
1728
1729 /* main receive path */
1730
1731 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1732                                 u8 *bssid, struct ieee80211_rx_data *rx,
1733                                 struct ieee80211_hdr *hdr)
1734 {
1735         int multicast = is_multicast_ether_addr(hdr->addr1);
1736
1737         switch (sdata->vif.type) {
1738         case IEEE80211_IF_TYPE_STA:
1739                 if (!bssid)
1740                         return 0;
1741                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1742                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1743                                 return 0;
1744                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1745                 } else if (!multicast &&
1746                            compare_ether_addr(sdata->dev->dev_addr,
1747                                               hdr->addr1) != 0) {
1748                         if (!(sdata->dev->flags & IFF_PROMISC))
1749                                 return 0;
1750                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1751                 }
1752                 break;
1753         case IEEE80211_IF_TYPE_IBSS:
1754                 if (!bssid)
1755                         return 0;
1756                 if (ieee80211_is_beacon(hdr->frame_control)) {
1757                         if (!rx->sta)
1758                                 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1759                                                 rx->skb, bssid, hdr->addr2,
1760                                                 BIT(rx->status->rate_idx));
1761                         return 1;
1762                 }
1763                 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1764                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1765                                 return 0;
1766                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1767                 } else if (!multicast &&
1768                            compare_ether_addr(sdata->dev->dev_addr,
1769                                               hdr->addr1) != 0) {
1770                         if (!(sdata->dev->flags & IFF_PROMISC))
1771                                 return 0;
1772                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1773                 } else if (!rx->sta)
1774                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1775                                                 bssid, hdr->addr2,
1776                                                 BIT(rx->status->rate_idx));
1777                 break;
1778         case IEEE80211_IF_TYPE_MESH_POINT:
1779                 if (!multicast &&
1780                     compare_ether_addr(sdata->dev->dev_addr,
1781                                        hdr->addr1) != 0) {
1782                         if (!(sdata->dev->flags & IFF_PROMISC))
1783                                 return 0;
1784
1785                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1786                 }
1787                 break;
1788         case IEEE80211_IF_TYPE_VLAN:
1789         case IEEE80211_IF_TYPE_AP:
1790                 if (!bssid) {
1791                         if (compare_ether_addr(sdata->dev->dev_addr,
1792                                                hdr->addr1))
1793                                 return 0;
1794                 } else if (!ieee80211_bssid_match(bssid,
1795                                         sdata->dev->dev_addr)) {
1796                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1797                                 return 0;
1798                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1799                 }
1800                 break;
1801         case IEEE80211_IF_TYPE_WDS:
1802                 if (bssid || !ieee80211_is_data(hdr->frame_control))
1803                         return 0;
1804                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1805                         return 0;
1806                 break;
1807         case IEEE80211_IF_TYPE_MNTR:
1808                 /* take everything */
1809                 break;
1810         case IEEE80211_IF_TYPE_INVALID:
1811                 /* should never get here */
1812                 WARN_ON(1);
1813                 break;
1814         }
1815
1816         return 1;
1817 }
1818
1819 /*
1820  * This is the actual Rx frames handler. as it blongs to Rx path it must
1821  * be called with rcu_read_lock protection.
1822  */
1823 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1824                                          struct sk_buff *skb,
1825                                          struct ieee80211_rx_status *status,
1826                                          struct ieee80211_rate *rate)
1827 {
1828         struct ieee80211_local *local = hw_to_local(hw);
1829         struct ieee80211_sub_if_data *sdata;
1830         struct ieee80211_hdr *hdr;
1831         struct ieee80211_rx_data rx;
1832         u16 type;
1833         int prepares;
1834         struct ieee80211_sub_if_data *prev = NULL;
1835         struct sk_buff *skb_new;
1836         u8 *bssid;
1837
1838         hdr = (struct ieee80211_hdr *) skb->data;
1839         memset(&rx, 0, sizeof(rx));
1840         rx.skb = skb;
1841         rx.local = local;
1842
1843         rx.status = status;
1844         rx.rate = rate;
1845         rx.fc = le16_to_cpu(hdr->frame_control);
1846         type = rx.fc & IEEE80211_FCTL_FTYPE;
1847
1848         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1849                 local->dot11ReceivedFragmentCount++;
1850
1851         rx.sta = sta_info_get(local, hdr->addr2);
1852         if (rx.sta) {
1853                 rx.sdata = rx.sta->sdata;
1854                 rx.dev = rx.sta->sdata->dev;
1855         }
1856
1857         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1858                 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1859                 return;
1860         }
1861
1862         if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1863                 rx.flags |= IEEE80211_RX_IN_SCAN;
1864
1865         ieee80211_parse_qos(&rx);
1866         ieee80211_verify_ip_alignment(&rx);
1867
1868         skb = rx.skb;
1869
1870         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1871                 if (!netif_running(sdata->dev))
1872                         continue;
1873
1874                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1875                         continue;
1876
1877                 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1878                 rx.flags |= IEEE80211_RX_RA_MATCH;
1879                 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1880
1881                 if (!prepares)
1882                         continue;
1883
1884                 /*
1885                  * frame is destined for this interface, but if it's not
1886                  * also for the previous one we handle that after the
1887                  * loop to avoid copying the SKB once too much
1888                  */
1889
1890                 if (!prev) {
1891                         prev = sdata;
1892                         continue;
1893                 }
1894
1895                 /*
1896                  * frame was destined for the previous interface
1897                  * so invoke RX handlers for it
1898                  */
1899
1900                 skb_new = skb_copy(skb, GFP_ATOMIC);
1901                 if (!skb_new) {
1902                         if (net_ratelimit())
1903                                 printk(KERN_DEBUG "%s: failed to copy "
1904                                        "multicast frame for %s\n",
1905                                        wiphy_name(local->hw.wiphy),
1906                                        prev->dev->name);
1907                         continue;
1908                 }
1909                 rx.fc = le16_to_cpu(hdr->frame_control);
1910                 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1911                 prev = sdata;
1912         }
1913         if (prev) {
1914                 rx.fc = le16_to_cpu(hdr->frame_control);
1915                 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1916         } else
1917                 dev_kfree_skb(skb);
1918 }
1919
1920 #define SEQ_MODULO 0x1000
1921 #define SEQ_MASK   0xfff
1922
1923 static inline int seq_less(u16 sq1, u16 sq2)
1924 {
1925         return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1926 }
1927
1928 static inline u16 seq_inc(u16 sq)
1929 {
1930         return ((sq + 1) & SEQ_MASK);
1931 }
1932
1933 static inline u16 seq_sub(u16 sq1, u16 sq2)
1934 {
1935         return ((sq1 - sq2) & SEQ_MASK);
1936 }
1937
1938
1939 /*
1940  * As it function blongs to Rx path it must be called with
1941  * the proper rcu_read_lock protection for its flow.
1942  */
1943 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1944                                 struct tid_ampdu_rx *tid_agg_rx,
1945                                 struct sk_buff *skb, u16 mpdu_seq_num,
1946                                 int bar_req)
1947 {
1948         struct ieee80211_local *local = hw_to_local(hw);
1949         struct ieee80211_rx_status status;
1950         u16 head_seq_num, buf_size;
1951         int index;
1952         struct ieee80211_supported_band *sband;
1953         struct ieee80211_rate *rate;
1954
1955         buf_size = tid_agg_rx->buf_size;
1956         head_seq_num = tid_agg_rx->head_seq_num;
1957
1958         /* frame with out of date sequence number */
1959         if (seq_less(mpdu_seq_num, head_seq_num)) {
1960                 dev_kfree_skb(skb);
1961                 return 1;
1962         }
1963
1964         /* if frame sequence number exceeds our buffering window size or
1965          * block Ack Request arrived - release stored frames */
1966         if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1967                 /* new head to the ordering buffer */
1968                 if (bar_req)
1969                         head_seq_num = mpdu_seq_num;
1970                 else
1971                         head_seq_num =
1972                                 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1973                 /* release stored frames up to new head to stack */
1974                 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1975                         index = seq_sub(tid_agg_rx->head_seq_num,
1976                                 tid_agg_rx->ssn)
1977                                 % tid_agg_rx->buf_size;
1978
1979                         if (tid_agg_rx->reorder_buf[index]) {
1980                                 /* release the reordered frames to stack */
1981                                 memcpy(&status,
1982                                         tid_agg_rx->reorder_buf[index]->cb,
1983                                         sizeof(status));
1984                                 sband = local->hw.wiphy->bands[status.band];
1985                                 rate = &sband->bitrates[status.rate_idx];
1986                                 __ieee80211_rx_handle_packet(hw,
1987                                         tid_agg_rx->reorder_buf[index],
1988                                         &status, rate);
1989                                 tid_agg_rx->stored_mpdu_num--;
1990                                 tid_agg_rx->reorder_buf[index] = NULL;
1991                         }
1992                         tid_agg_rx->head_seq_num =
1993                                 seq_inc(tid_agg_rx->head_seq_num);
1994                 }
1995                 if (bar_req)
1996                         return 1;
1997         }
1998
1999         /* now the new frame is always in the range of the reordering */
2000         /* buffer window */
2001         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2002                                 % tid_agg_rx->buf_size;
2003         /* check if we already stored this frame */
2004         if (tid_agg_rx->reorder_buf[index]) {
2005                 dev_kfree_skb(skb);
2006                 return 1;
2007         }
2008
2009         /* if arrived mpdu is in the right order and nothing else stored */
2010         /* release it immediately */
2011         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2012                         tid_agg_rx->stored_mpdu_num == 0) {
2013                 tid_agg_rx->head_seq_num =
2014                         seq_inc(tid_agg_rx->head_seq_num);
2015                 return 0;
2016         }
2017
2018         /* put the frame in the reordering buffer */
2019         tid_agg_rx->reorder_buf[index] = skb;
2020         tid_agg_rx->stored_mpdu_num++;
2021         /* release the buffer until next missing frame */
2022         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2023                                                 % tid_agg_rx->buf_size;
2024         while (tid_agg_rx->reorder_buf[index]) {
2025                 /* release the reordered frame back to stack */
2026                 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2027                         sizeof(status));
2028                 sband = local->hw.wiphy->bands[status.band];
2029                 rate = &sband->bitrates[status.rate_idx];
2030                 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2031                                              &status, rate);
2032                 tid_agg_rx->stored_mpdu_num--;
2033                 tid_agg_rx->reorder_buf[index] = NULL;
2034                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2035                 index = seq_sub(tid_agg_rx->head_seq_num,
2036                         tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2037         }
2038         return 1;
2039 }
2040
2041 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2042                                      struct sk_buff *skb)
2043 {
2044         struct ieee80211_hw *hw = &local->hw;
2045         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2046         struct sta_info *sta;
2047         struct tid_ampdu_rx *tid_agg_rx;
2048         u16 sc;
2049         u16 mpdu_seq_num;
2050         u8 ret = 0;
2051         int tid;
2052
2053         sta = sta_info_get(local, hdr->addr2);
2054         if (!sta)
2055                 return ret;
2056
2057         /* filter the QoS data rx stream according to
2058          * STA/TID and check if this STA/TID is on aggregation */
2059         if (!ieee80211_is_data_qos(hdr->frame_control))
2060                 goto end_reorder;
2061
2062         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2063
2064         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2065                 goto end_reorder;
2066
2067         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2068
2069         /* qos null data frames are excluded */
2070         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2071                 goto end_reorder;
2072
2073         /* new un-ordered ampdu frame - process it */
2074
2075         /* reset session timer */
2076         if (tid_agg_rx->timeout) {
2077                 unsigned long expires =
2078                         jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2079                 mod_timer(&tid_agg_rx->session_timer, expires);
2080         }
2081
2082         /* if this mpdu is fragmented - terminate rx aggregation session */
2083         sc = le16_to_cpu(hdr->seq_ctrl);
2084         if (sc & IEEE80211_SCTL_FRAG) {
2085                 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2086                         tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2087                 ret = 1;
2088                 goto end_reorder;
2089         }
2090
2091         /* according to mpdu sequence number deal with reordering buffer */
2092         mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2093         ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2094                                                 mpdu_seq_num, 0);
2095  end_reorder:
2096         return ret;
2097 }
2098
2099 /*
2100  * This is the receive path handler. It is called by a low level driver when an
2101  * 802.11 MPDU is received from the hardware.
2102  */
2103 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2104                     struct ieee80211_rx_status *status)
2105 {
2106         struct ieee80211_local *local = hw_to_local(hw);
2107         struct ieee80211_rate *rate = NULL;
2108         struct ieee80211_supported_band *sband;
2109
2110         if (status->band < 0 ||
2111             status->band >= IEEE80211_NUM_BANDS) {
2112                 WARN_ON(1);
2113                 return;
2114         }
2115
2116         sband = local->hw.wiphy->bands[status->band];
2117
2118         if (!sband ||
2119             status->rate_idx < 0 ||
2120             status->rate_idx >= sband->n_bitrates) {
2121                 WARN_ON(1);
2122                 return;
2123         }
2124
2125         rate = &sband->bitrates[status->rate_idx];
2126
2127         /*
2128          * key references and virtual interfaces are protected using RCU
2129          * and this requires that we are in a read-side RCU section during
2130          * receive processing
2131          */
2132         rcu_read_lock();
2133
2134         /*
2135          * Frames with failed FCS/PLCP checksum are not returned,
2136          * all other frames are returned without radiotap header
2137          * if it was previously present.
2138          * Also, frames with less than 16 bytes are dropped.
2139          */
2140         skb = ieee80211_rx_monitor(local, skb, status, rate);
2141         if (!skb) {
2142                 rcu_read_unlock();
2143                 return;
2144         }
2145
2146         if (!ieee80211_rx_reorder_ampdu(local, skb))
2147                 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2148
2149         rcu_read_unlock();
2150 }
2151 EXPORT_SYMBOL(__ieee80211_rx);
2152
2153 /* This is a version of the rx handler that can be called from hard irq
2154  * context. Post the skb on the queue and schedule the tasklet */
2155 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2156                           struct ieee80211_rx_status *status)
2157 {
2158         struct ieee80211_local *local = hw_to_local(hw);
2159
2160         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2161
2162         skb->dev = local->mdev;
2163         /* copy status into skb->cb for use by tasklet */
2164         memcpy(skb->cb, status, sizeof(*status));
2165         skb->pkt_type = IEEE80211_RX_MSG;
2166         skb_queue_tail(&local->skb_queue, skb);
2167         tasklet_schedule(&local->tasklet);
2168 }
2169 EXPORT_SYMBOL(ieee80211_rx_irqsafe);