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 2007-2010  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/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22
  23 #include "ieee80211_i.h"
  24 #include "driver-ops.h"
  25 #include "led.h"
  26 #include "mesh.h"
  27 #include "wep.h"
  28 #include "wpa.h"
  29 #include "tkip.h"
  30 #include "wme.h"
  31 #include "rate.h"
  32
  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 {
  42         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  43                 if (likely(skb->len > FCS_LEN))
  44                         __pskb_trim(skb, skb->len - FCS_LEN);
  45                 else {
  46                         /* driver bug */
  47                         WARN_ON(1);
  48                         dev_kfree_skb(skb);
  49                         skb = NULL;
  50                 }
  51         }
  52
  53         return skb;
  54 }
  55
  56 static inline int should_drop_frame(struct sk_buff *skb,
  57                                     int present_fcs_len)
  58 {
  59         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  60         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  61
  62         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
  63                 return 1;
  64         if (unlikely(skb->len < 16 + present_fcs_len))
  65                 return 1;
  66         if (ieee80211_is_ctl(hdr->frame_control) &&
  67             !ieee80211_is_pspoll(hdr->frame_control) &&
  68             !ieee80211_is_back_req(hdr->frame_control))
  69                 return 1;
  70         return 0;
  71 }
  72
  73 static int
  74 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
  75                           struct ieee80211_rx_status *status)
  76 {
  77         int len;
  78
  79         /* always present fields */
  80         len = sizeof(struct ieee80211_radiotap_header) + 9;
  81
  82         if (status->flag & RX_FLAG_MACTIME_MPDU)
  83                 len += 8;
  84         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  85                 len += 1;
  86
  87         if (len & 1) /* padding for RX_FLAGS if necessary */
  88                 len++;
  89
  90         if (status->flag & RX_FLAG_HT) /* HT info */
  91                 len += 3;
  92
  93         return len;
  94 }
  95
  96 /*
  97  * ieee80211_add_rx_radiotap_header - add radiotap header
  98  *
  99  * add a radiotap header containing all the fields which the hardware provided.
 100  */
 101 static void
 102 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 103                                  struct sk_buff *skb,
 104                                  struct ieee80211_rate *rate,
 105                                  int rtap_len)
 106 {
 107         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 108         struct ieee80211_radiotap_header *rthdr;
 109         unsigned char *pos;
 110         u16 rx_flags = 0;
 111
 112         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 113         memset(rthdr, 0, rtap_len);
 114
 115         /* radiotap header, set always present flags */
 116         rthdr->it_present =
 117                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 118                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 119                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
 120                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 121         rthdr->it_len = cpu_to_le16(rtap_len);
 122
 123         pos = (unsigned char *)(rthdr+1);
 124
 125         /* the order of the following fields is important */
 126
 127         /* IEEE80211_RADIOTAP_TSFT */
 128         if (status->flag & RX_FLAG_MACTIME_MPDU) {
 129                 put_unaligned_le64(status->mactime, pos);
 130                 rthdr->it_present |=
 131                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 132                 pos += 8;
 133         }
 134
 135         /* IEEE80211_RADIOTAP_FLAGS */
 136         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 137                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 138         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 139                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 140         if (status->flag & RX_FLAG_SHORTPRE)
 141                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 142         pos++;
 143
 144         /* IEEE80211_RADIOTAP_RATE */
 145         if (!rate || status->flag & RX_FLAG_HT) {
 146                 /*
 147                  * Without rate information don't add it. If we have,
 148                  * MCS information is a separate field in radiotap,
 149                  * added below. The byte here is needed as padding
 150                  * for the channel though, so initialise it to 0.
 151                  */
 152                 *pos = 0;
 153         } else {
 154                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 155                 *pos = rate->bitrate / 5;
 156         }
 157         pos++;
 158
 159         /* IEEE80211_RADIOTAP_CHANNEL */
 160         put_unaligned_le16(status->freq, pos);
 161         pos += 2;
 162         if (status->band == IEEE80211_BAND_5GHZ)
 163                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 164                                    pos);
 165         else if (status->flag & RX_FLAG_HT)
 166                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
 167                                    pos);
 168         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 169                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 170                                    pos);
 171         else if (rate)
 172                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 173                                    pos);
 174         else
 175                 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
 176         pos += 2;
 177
 178         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 179         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
 180                 *pos = status->signal;
 181                 rthdr->it_present |=
 182                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 183                 pos++;
 184         }
 185
 186         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 187
 188         /* IEEE80211_RADIOTAP_ANTENNA */
 189         *pos = status->antenna;
 190         pos++;
 191
 192         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 193
 194         /* IEEE80211_RADIOTAP_RX_FLAGS */
 195         /* ensure 2 byte alignment for the 2 byte field as required */
 196         if ((pos - (u8 *)rthdr) & 1)
 197                 pos++;
 198         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 199                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 200         put_unaligned_le16(rx_flags, pos);
 201         pos += 2;
 202
 203         if (status->flag & RX_FLAG_HT) {
 204                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 205                 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 206                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 207                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 208                 *pos = 0;
 209                 if (status->flag & RX_FLAG_SHORT_GI)
 210                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 211                 if (status->flag & RX_FLAG_40MHZ)
 212                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 213                 pos++;
 214                 *pos++ = status->rate_idx;
 215         }
 216 }
 217
 218 /*
 219  * This function copies a received frame to all monitor interfaces and
 220  * returns a cleaned-up SKB that no longer includes the FCS nor the
 221  * radiotap header the driver might have added.
 222  */
 223 static struct sk_buff *
 224 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 225                      struct ieee80211_rate *rate)
 226 {
 227         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 228         struct ieee80211_sub_if_data *sdata;
 229         int needed_headroom = 0;
 230         struct sk_buff *skb, *skb2;
 231         struct net_device *prev_dev = NULL;
 232         int present_fcs_len = 0;
 233
 234         /*
 235          * First, we may need to make a copy of the skb because
 236          *  (1) we need to modify it for radiotap (if not present), and
 237          *  (2) the other RX handlers will modify the skb we got.
 238          *
 239          * We don't need to, of course, if we aren't going to return
 240          * the SKB because it has a bad FCS/PLCP checksum.
 241          */
 242
 243         /* room for the radiotap header based on driver features */
 244         needed_headroom = ieee80211_rx_radiotap_len(local, status);
 245
 246         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 247                 present_fcs_len = FCS_LEN;
 248
 249         /* make sure hdr->frame_control is on the linear part */
 250         if (!pskb_may_pull(origskb, 2)) {
 251                 dev_kfree_skb(origskb);
 252                 return NULL;
 253         }
 254
 255         if (!local->monitors) {
 256                 if (should_drop_frame(origskb, present_fcs_len)) {
 257                         dev_kfree_skb(origskb);
 258                         return NULL;
 259                 }
 260
 261                 return remove_monitor_info(local, origskb);
 262         }
 263
 264         if (should_drop_frame(origskb, present_fcs_len)) {
 265                 /* only need to expand headroom if necessary */
 266                 skb = origskb;
 267                 origskb = NULL;
 268
 269                 /*
 270                  * This shouldn't trigger often because most devices have an
 271                  * RX header they pull before we get here, and that should
 272                  * be big enough for our radiotap information. We should
 273                  * probably export the length to drivers so that we can have
 274                  * them allocate enough headroom to start with.
 275                  */
 276                 if (skb_headroom(skb) < needed_headroom &&
 277                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 278                         dev_kfree_skb(skb);
 279                         return NULL;
 280                 }
 281         } else {
 282                 /*
 283                  * Need to make a copy and possibly remove radiotap header
 284                  * and FCS from the original.
 285                  */
 286                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 287
 288                 origskb = remove_monitor_info(local, origskb);
 289
 290                 if (!skb)
 291                         return origskb;
 292         }
 293
 294         /* prepend radiotap information */
 295         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
 296
 297         skb_reset_mac_header(skb);
 298         skb->ip_summed = CHECKSUM_UNNECESSARY;
 299         skb->pkt_type = PACKET_OTHERHOST;
 300         skb->protocol = htons(ETH_P_802_2);
 301
 302         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 303                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 304                         continue;
 305
 306                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 307                         continue;
 308
 309                 if (!ieee80211_sdata_running(sdata))
 310                         continue;
 311
 312                 if (prev_dev) {
 313                         skb2 = skb_clone(skb, GFP_ATOMIC);
 314                         if (skb2) {
 315                                 skb2->dev = prev_dev;
 316                                 netif_receive_skb(skb2);
 317                         }
 318                 }
 319
 320                 prev_dev = sdata->dev;
 321                 sdata->dev->stats.rx_packets++;
 322                 sdata->dev->stats.rx_bytes += skb->len;
 323         }
 324
 325         if (prev_dev) {
 326                 skb->dev = prev_dev;
 327                 netif_receive_skb(skb);
 328         } else
 329                 dev_kfree_skb(skb);
 330
 331         return origskb;
 332 }
 333
 334
 335 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 336 {
 337         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 338         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 339         int tid, seqno_idx, security_idx;
 340
 341         /* does the frame have a qos control field? */
 342         if (ieee80211_is_data_qos(hdr->frame_control)) {
 343                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 344                 /* frame has qos control */
 345                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 346                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 347                         status->rx_flags |= IEEE80211_RX_AMSDU;
 348
 349                 seqno_idx = tid;
 350                 security_idx = tid;
 351         } else {
 352                 /*
 353                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 354                  *
 355                  *      Sequence numbers for management frames, QoS data
 356                  *      frames with a broadcast/multicast address in the
 357                  *      Address 1 field, and all non-QoS data frames sent
 358                  *      by QoS STAs are assigned using an additional single
 359                  *      modulo-4096 counter, [...]
 360                  *
 361                  * We also use that counter for non-QoS STAs.
 362                  */
 363                 seqno_idx = NUM_RX_DATA_QUEUES;
 364                 security_idx = 0;
 365                 if (ieee80211_is_mgmt(hdr->frame_control))
 366                         security_idx = NUM_RX_DATA_QUEUES;
 367                 tid = 0;
 368         }
 369
 370         rx->seqno_idx = seqno_idx;
 371         rx->security_idx = security_idx;
 372         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 373          * For now, set skb->priority to 0 for other cases. */
 374         rx->skb->priority = (tid > 7) ? 0 : tid;
 375 }
 376
 377 /**
 378  * DOC: Packet alignment
 379  *
 380  * Drivers always need to pass packets that are aligned to two-byte boundaries
 381  * to the stack.
 382  *
 383  * Additionally, should, if possible, align the payload data in a way that
 384  * guarantees that the contained IP header is aligned to a four-byte
 385  * boundary. In the case of regular frames, this simply means aligning the
 386  * payload to a four-byte boundary (because either the IP header is directly
 387  * contained, or IV/RFC1042 headers that have a length divisible by four are
 388  * in front of it).  If the payload data is not properly aligned and the
 389  * architecture doesn't support efficient unaligned operations, mac80211
 390  * will align the data.
 391  *
 392  * With A-MSDU frames, however, the payload data address must yield two modulo
 393  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 394  * push the IP header further back to a multiple of four again. Thankfully, the
 395  * specs were sane enough this time around to require padding each A-MSDU
 396  * subframe to a length that is a multiple of four.
 397  *
 398  * Padding like Atheros hardware adds which is between the 802.11 header and
 399  * the payload is not supported, the driver is required to move the 802.11
 400  * header to be directly in front of the payload in that case.
 401  */
 402 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 403 {
 404 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 405         WARN_ONCE((unsigned long)rx->skb->data & 1,
 406                   "unaligned packet at 0x%p\n", rx->skb->data);
 407 #endif
 408 }
 409
 410
 411 /* rx handlers */
 412
 413 static ieee80211_rx_result debug_noinline
 414 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
 415 {
 416         struct ieee80211_local *local = rx->local;
 417         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 418         struct sk_buff *skb = rx->skb;
 419
 420         if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
 421                    !local->sched_scanning))
 422                 return RX_CONTINUE;
 423
 424         if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 425             test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 426             local->sched_scanning)
 427                 return ieee80211_scan_rx(rx->sdata, skb);
 428
 429         /* scanning finished during invoking of handlers */
 430         I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 431         return RX_DROP_UNUSABLE;
 432 }
 433
 434
 435 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 436 {
 437         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 438
 439         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 440                 return 0;
 441
 442         return ieee80211_is_robust_mgmt_frame(hdr);
 443 }
 444
 445
 446 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 447 {
 448         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 449
 450         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 451                 return 0;
 452
 453         return ieee80211_is_robust_mgmt_frame(hdr);
 454 }
 455
 456
 457 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 458 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 459 {
 460         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 461         struct ieee80211_mmie *mmie;
 462
 463         if (skb->len < 24 + sizeof(*mmie) ||
 464             !is_multicast_ether_addr(hdr->da))
 465                 return -1;
 466
 467         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 468                 return -1; /* not a robust management frame */
 469
 470         mmie = (struct ieee80211_mmie *)
 471                 (skb->data + skb->len - sizeof(*mmie));
 472         if (mmie->element_id != WLAN_EID_MMIE ||
 473             mmie->length != sizeof(*mmie) - 2)
 474                 return -1;
 475
 476         return le16_to_cpu(mmie->key_id);
 477 }
 478
 479
 480 static ieee80211_rx_result
 481 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 482 {
 483         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 484         char *dev_addr = rx->sdata->vif.addr;
 485
 486         if (ieee80211_is_data(hdr->frame_control)) {
 487                 if (is_multicast_ether_addr(hdr->addr1)) {
 488                         if (ieee80211_has_tods(hdr->frame_control) ||
 489                                 !ieee80211_has_fromds(hdr->frame_control))
 490                                 return RX_DROP_MONITOR;
 491                         if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
 492                                 return RX_DROP_MONITOR;
 493                 } else {
 494                         if (!ieee80211_has_a4(hdr->frame_control))
 495                                 return RX_DROP_MONITOR;
 496                         if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
 497                                 return RX_DROP_MONITOR;
 498                 }
 499         }
 500
 501         /* If there is not an established peer link and this is not a peer link
 502          * establisment frame, beacon or probe, drop the frame.
 503          */
 504
 505         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 506                 struct ieee80211_mgmt *mgmt;
 507
 508                 if (!ieee80211_is_mgmt(hdr->frame_control))
 509                         return RX_DROP_MONITOR;
 510
 511                 if (ieee80211_is_action(hdr->frame_control)) {
 512                         u8 category;
 513                         mgmt = (struct ieee80211_mgmt *)hdr;
 514                         category = mgmt->u.action.category;
 515                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 516                                 category != WLAN_CATEGORY_SELF_PROTECTED)
 517                                 return RX_DROP_MONITOR;
 518                         return RX_CONTINUE;
 519                 }
 520
 521                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 522                     ieee80211_is_probe_resp(hdr->frame_control) ||
 523                     ieee80211_is_beacon(hdr->frame_control) ||
 524                     ieee80211_is_auth(hdr->frame_control))
 525                         return RX_CONTINUE;
 526
 527                 return RX_DROP_MONITOR;
 528
 529         }
 530
 531         return RX_CONTINUE;
 532 }
 533
 534 #define SEQ_MODULO 0x1000
 535 #define SEQ_MASK   0xfff
 536
 537 static inline int seq_less(u16 sq1, u16 sq2)
 538 {
 539         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
 540 }
 541
 542 static inline u16 seq_inc(u16 sq)
 543 {
 544         return (sq + 1) & SEQ_MASK;
 545 }
 546
 547 static inline u16 seq_sub(u16 sq1, u16 sq2)
 548 {
 549         return (sq1 - sq2) & SEQ_MASK;
 550 }
 551
 552
 553 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
 554                                             struct tid_ampdu_rx *tid_agg_rx,
 555                                             int index)
 556 {
 557         struct ieee80211_local *local = hw_to_local(hw);
 558         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 559         struct ieee80211_rx_status *status;
 560
 561         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 562
 563         if (!skb)
 564                 goto no_frame;
 565
 566         /* release the frame from the reorder ring buffer */
 567         tid_agg_rx->stored_mpdu_num--;
 568         tid_agg_rx->reorder_buf[index] = NULL;
 569         status = IEEE80211_SKB_RXCB(skb);
 570         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 571         skb_queue_tail(&local->rx_skb_queue, skb);
 572
 573 no_frame:
 574         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 575 }
 576
 577 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
 578                                              struct tid_ampdu_rx *tid_agg_rx,
 579                                              u16 head_seq_num)
 580 {
 581         int index;
 582
 583         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 584
 585         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 586                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 587                                                         tid_agg_rx->buf_size;
 588                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
 589         }
 590 }
 591
 592 /*
 593  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 594  * the skb was added to the buffer longer than this time ago, the earlier
 595  * frames that have not yet been received are assumed to be lost and the skb
 596  * can be released for processing. This may also release other skb's from the
 597  * reorder buffer if there are no additional gaps between the frames.
 598  *
 599  * Callers must hold tid_agg_rx->reorder_lock.
 600  */
 601 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 602
 603 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
 604                                           struct tid_ampdu_rx *tid_agg_rx)
 605 {
 606         int index, j;
 607
 608         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 609
 610         /* release the buffer until next missing frame */
 611         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 612                                                 tid_agg_rx->buf_size;
 613         if (!tid_agg_rx->reorder_buf[index] &&
 614             tid_agg_rx->stored_mpdu_num) {
 615                 /*
 616                  * No buffers ready to be released, but check whether any
 617                  * frames in the reorder buffer have timed out.
 618                  */
 619                 int skipped = 1;
 620                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 621                      j = (j + 1) % tid_agg_rx->buf_size) {
 622                         if (!tid_agg_rx->reorder_buf[j]) {
 623                                 skipped++;
 624                                 continue;
 625                         }
 626                         if (skipped &&
 627                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 628                                         HT_RX_REORDER_BUF_TIMEOUT))
 629                                 goto set_release_timer;
 630
 631 #ifdef CONFIG_MAC80211_HT_DEBUG
 632                         if (net_ratelimit())
 633                                 wiphy_debug(hw->wiphy,
 634                                             "release an RX reorder frame due to timeout on earlier frames\n");
 635 #endif
 636                         ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
 637
 638                         /*
 639                          * Increment the head seq# also for the skipped slots.
 640                          */
 641                         tid_agg_rx->head_seq_num =
 642                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
 643                         skipped = 0;
 644                 }
 645         } else while (tid_agg_rx->reorder_buf[index]) {
 646                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
 647                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 648                                                         tid_agg_rx->buf_size;
 649         }
 650
 651         if (tid_agg_rx->stored_mpdu_num) {
 652                 j = index = seq_sub(tid_agg_rx->head_seq_num,
 653                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 654
 655                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 656                      j = (j + 1) % tid_agg_rx->buf_size) {
 657                         if (tid_agg_rx->reorder_buf[j])
 658                                 break;
 659                 }
 660
 661  set_release_timer:
 662
 663                 mod_timer(&tid_agg_rx->reorder_timer,
 664                           tid_agg_rx->reorder_time[j] + 1 +
 665                           HT_RX_REORDER_BUF_TIMEOUT);
 666         } else {
 667                 del_timer(&tid_agg_rx->reorder_timer);
 668         }
 669 }
 670
 671 /*
 672  * As this function belongs to the RX path it must be under
 673  * rcu_read_lock protection. It returns false if the frame
 674  * can be processed immediately, true if it was consumed.
 675  */
 676 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 677                                              struct tid_ampdu_rx *tid_agg_rx,
 678                                              struct sk_buff *skb)
 679 {
 680         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 681         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 682         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 683         u16 head_seq_num, buf_size;
 684         int index;
 685         bool ret = true;
 686
 687         spin_lock(&tid_agg_rx->reorder_lock);
 688
 689         buf_size = tid_agg_rx->buf_size;
 690         head_seq_num = tid_agg_rx->head_seq_num;
 691
 692         /* frame with out of date sequence number */
 693         if (seq_less(mpdu_seq_num, head_seq_num)) {
 694                 dev_kfree_skb(skb);
 695                 goto out;
 696         }
 697
 698         /*
 699          * If frame the sequence number exceeds our buffering window
 700          * size release some previous frames to make room for this one.
 701          */
 702         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
 703                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
 704                 /* release stored frames up to new head to stack */
 705                 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
 706         }
 707
 708         /* Now the new frame is always in the range of the reordering buffer */
 709
 710         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 711
 712         /* check if we already stored this frame */
 713         if (tid_agg_rx->reorder_buf[index]) {
 714                 dev_kfree_skb(skb);
 715                 goto out;
 716         }
 717
 718         /*
 719          * If the current MPDU is in the right order and nothing else
 720          * is stored we can process it directly, no need to buffer it.
 721          * If it is first but there's something stored, we may be able
 722          * to release frames after this one.
 723          */
 724         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 725             tid_agg_rx->stored_mpdu_num == 0) {
 726                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 727                 ret = false;
 728                 goto out;
 729         }
 730
 731         /* put the frame in the reordering buffer */
 732         tid_agg_rx->reorder_buf[index] = skb;
 733         tid_agg_rx->reorder_time[index] = jiffies;
 734         tid_agg_rx->stored_mpdu_num++;
 735         ieee80211_sta_reorder_release(hw, tid_agg_rx);
 736
 737  out:
 738         spin_unlock(&tid_agg_rx->reorder_lock);
 739         return ret;
 740 }
 741
 742 /*
 743  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 744  * true if the MPDU was buffered, false if it should be processed.
 745  */
 746 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
 747 {
 748         struct sk_buff *skb = rx->skb;
 749         struct ieee80211_local *local = rx->local;
 750         struct ieee80211_hw *hw = &local->hw;
 751         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 752         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 753         struct sta_info *sta = rx->sta;
 754         struct tid_ampdu_rx *tid_agg_rx;
 755         u16 sc;
 756         u8 tid, ack_policy;
 757
 758         if (!ieee80211_is_data_qos(hdr->frame_control))
 759                 goto dont_reorder;
 760
 761         /*
 762          * filter the QoS data rx stream according to
 763          * STA/TID and check if this STA/TID is on aggregation
 764          */
 765
 766         if (!sta)
 767                 goto dont_reorder;
 768
 769         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 770                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 771         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 772
 773         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 774         if (!tid_agg_rx)
 775                 goto dont_reorder;
 776
 777         /* qos null data frames are excluded */
 778         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 779                 goto dont_reorder;
 780
 781         /* not part of a BA session */
 782         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 783             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 784                 goto dont_reorder;
 785
 786         /* not actually part of this BA session */
 787         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 788                 goto dont_reorder;
 789
 790         /* new, potentially un-ordered, ampdu frame - process it */
 791
 792         /* reset session timer */
 793         if (tid_agg_rx->timeout)
 794                 mod_timer(&tid_agg_rx->session_timer,
 795                           TU_TO_EXP_TIME(tid_agg_rx->timeout));
 796
 797         /* if this mpdu is fragmented - terminate rx aggregation session */
 798         sc = le16_to_cpu(hdr->seq_ctrl);
 799         if (sc & IEEE80211_SCTL_FRAG) {
 800                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 801                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 802                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 803                 return;
 804         }
 805
 806         /*
 807          * No locking needed -- we will only ever process one
 808          * RX packet at a time, and thus own tid_agg_rx. All
 809          * other code manipulating it needs to (and does) make
 810          * sure that we cannot get to it any more before doing
 811          * anything with it.
 812          */
 813         if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
 814                 return;
 815
 816  dont_reorder:
 817         skb_queue_tail(&local->rx_skb_queue, skb);
 818 }
 819
 820 static ieee80211_rx_result debug_noinline
 821 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 822 {
 823         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 824         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 825
 826         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 827         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 828                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 829                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 830                              hdr->seq_ctrl)) {
 831                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 832                                 rx->local->dot11FrameDuplicateCount++;
 833                                 rx->sta->num_duplicates++;
 834                         }
 835                         return RX_DROP_UNUSABLE;
 836                 } else
 837                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 838         }
 839
 840         if (unlikely(rx->skb->len < 16)) {
 841                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 842                 return RX_DROP_MONITOR;
 843         }
 844
 845         /* Drop disallowed frame classes based on STA auth/assoc state;
 846          * IEEE 802.11, Chap 5.5.
 847          *
 848          * mac80211 filters only based on association state, i.e. it drops
 849          * Class 3 frames from not associated stations. hostapd sends
 850          * deauth/disassoc frames when needed. In addition, hostapd is
 851          * responsible for filtering on both auth and assoc states.
 852          */
 853
 854         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 855                 return ieee80211_rx_mesh_check(rx);
 856
 857         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 858                       ieee80211_is_pspoll(hdr->frame_control)) &&
 859                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 860                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 861                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
 862                 if (rx->sta && rx->sta->dummy &&
 863                     ieee80211_is_data_present(hdr->frame_control)) {
 864                         u16 ethertype;
 865                         u8 *payload;
 866
 867                         payload = rx->skb->data +
 868                                 ieee80211_hdrlen(hdr->frame_control);
 869                         ethertype = (payload[6] << 8) | payload[7];
 870                         if (cpu_to_be16(ethertype) ==
 871                             rx->sdata->control_port_protocol)
 872                                 return RX_CONTINUE;
 873                 }
 874
 875                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
 876                     cfg80211_rx_spurious_frame(rx->sdata->dev,
 877                                                hdr->addr2,
 878                                                GFP_ATOMIC))
 879                         return RX_DROP_UNUSABLE;
 880
 881                 return RX_DROP_MONITOR;
 882         }
 883
 884         return RX_CONTINUE;
 885 }
 886
 887
 888 static ieee80211_rx_result debug_noinline
 889 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
 890 {
 891         struct sk_buff *skb = rx->skb;
 892         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 893         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 894         int keyidx;
 895         int hdrlen;
 896         ieee80211_rx_result result = RX_DROP_UNUSABLE;
 897         struct ieee80211_key *sta_ptk = NULL;
 898         int mmie_keyidx = -1;
 899         __le16 fc;
 900
 901         /*
 902          * Key selection 101
 903          *
 904          * There are four types of keys:
 905          *  - GTK (group keys)
 906          *  - IGTK (group keys for management frames)
 907          *  - PTK (pairwise keys)
 908          *  - STK (station-to-station pairwise keys)
 909          *
 910          * When selecting a key, we have to distinguish between multicast
 911          * (including broadcast) and unicast frames, the latter can only
 912          * use PTKs and STKs while the former always use GTKs and IGTKs.
 913          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
 914          * unicast frames can also use key indices like GTKs. Hence, if we
 915          * don't have a PTK/STK we check the key index for a WEP key.
 916          *
 917          * Note that in a regular BSS, multicast frames are sent by the
 918          * AP only, associated stations unicast the frame to the AP first
 919          * which then multicasts it on their behalf.
 920          *
 921          * There is also a slight problem in IBSS mode: GTKs are negotiated
 922          * with each station, that is something we don't currently handle.
 923          * The spec seems to expect that one negotiates the same key with
 924          * every station but there's no such requirement; VLANs could be
 925          * possible.
 926          */
 927
 928         /*
 929          * No point in finding a key and decrypting if the frame is neither
 930          * addressed to us nor a multicast frame.
 931          */
 932         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 933                 return RX_CONTINUE;
 934
 935         /* start without a key */
 936         rx->key = NULL;
 937
 938         if (rx->sta)
 939                 sta_ptk = rcu_dereference(rx->sta->ptk);
 940
 941         fc = hdr->frame_control;
 942
 943         if (!ieee80211_has_protected(fc))
 944                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
 945
 946         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
 947                 rx->key = sta_ptk;
 948                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 949                     (status->flag & RX_FLAG_IV_STRIPPED))
 950                         return RX_CONTINUE;
 951                 /* Skip decryption if the frame is not protected. */
 952                 if (!ieee80211_has_protected(fc))
 953                         return RX_CONTINUE;
 954         } else if (mmie_keyidx >= 0) {
 955                 /* Broadcast/multicast robust management frame / BIP */
 956                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 957                     (status->flag & RX_FLAG_IV_STRIPPED))
 958                         return RX_CONTINUE;
 959
 960                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
 961                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 962                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
 963                 if (rx->sta)
 964                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
 965                 if (!rx->key)
 966                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
 967         } else if (!ieee80211_has_protected(fc)) {
 968                 /*
 969                  * The frame was not protected, so skip decryption. However, we
 970                  * need to set rx->key if there is a key that could have been
 971                  * used so that the frame may be dropped if encryption would
 972                  * have been expected.
 973                  */
 974                 struct ieee80211_key *key = NULL;
 975                 struct ieee80211_sub_if_data *sdata = rx->sdata;
 976                 int i;
 977
 978                 if (ieee80211_is_mgmt(fc) &&
 979                     is_multicast_ether_addr(hdr->addr1) &&
 980                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
 981                         rx->key = key;
 982                 else {
 983                         if (rx->sta) {
 984                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 985                                         key = rcu_dereference(rx->sta->gtk[i]);
 986                                         if (key)
 987                                                 break;
 988                                 }
 989                         }
 990                         if (!key) {
 991                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 992                                         key = rcu_dereference(sdata->keys[i]);
 993                                         if (key)
 994                                                 break;
 995                                 }
 996                         }
 997                         if (key)
 998                                 rx->key = key;
 999                 }
1000                 return RX_CONTINUE;
1001         } else {
1002                 u8 keyid;
1003                 /*
1004                  * The device doesn't give us the IV so we won't be
1005                  * able to look up the key. That's ok though, we
1006                  * don't need to decrypt the frame, we just won't
1007                  * be able to keep statistics accurate.
1008                  * Except for key threshold notifications, should
1009                  * we somehow allow the driver to tell us which key
1010                  * the hardware used if this flag is set?
1011                  */
1012                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1013                     (status->flag & RX_FLAG_IV_STRIPPED))
1014                         return RX_CONTINUE;
1015
1016                 hdrlen = ieee80211_hdrlen(fc);
1017
1018                 if (rx->skb->len < 8 + hdrlen)
1019                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1020
1021                 /*
1022                  * no need to call ieee80211_wep_get_keyidx,
1023                  * it verifies a bunch of things we've done already
1024                  */
1025                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1026                 keyidx = keyid >> 6;
1027
1028                 /* check per-station GTK first, if multicast packet */
1029                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1030                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1031
1032                 /* if not found, try default key */
1033                 if (!rx->key) {
1034                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1035
1036                         /*
1037                          * RSNA-protected unicast frames should always be
1038                          * sent with pairwise or station-to-station keys,
1039                          * but for WEP we allow using a key index as well.
1040                          */
1041                         if (rx->key &&
1042                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1043                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1044                             !is_multicast_ether_addr(hdr->addr1))
1045                                 rx->key = NULL;
1046                 }
1047         }
1048
1049         if (rx->key) {
1050                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1051                         return RX_DROP_MONITOR;
1052
1053                 rx->key->tx_rx_count++;
1054                 /* TODO: add threshold stuff again */
1055         } else {
1056                 return RX_DROP_MONITOR;
1057         }
1058
1059         if (skb_linearize(rx->skb))
1060                 return RX_DROP_UNUSABLE;
1061         /* the hdr variable is invalid now! */
1062
1063         switch (rx->key->conf.cipher) {
1064         case WLAN_CIPHER_SUITE_WEP40:
1065         case WLAN_CIPHER_SUITE_WEP104:
1066                 /* Check for weak IVs if possible */
1067                 if (rx->sta && ieee80211_is_data(fc) &&
1068                     (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1069                      !(status->flag & RX_FLAG_DECRYPTED)) &&
1070                     ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1071                         rx->sta->wep_weak_iv_count++;
1072
1073                 result = ieee80211_crypto_wep_decrypt(rx);
1074                 break;
1075         case WLAN_CIPHER_SUITE_TKIP:
1076                 result = ieee80211_crypto_tkip_decrypt(rx);
1077                 break;
1078         case WLAN_CIPHER_SUITE_CCMP:
1079                 result = ieee80211_crypto_ccmp_decrypt(rx);
1080                 break;
1081         case WLAN_CIPHER_SUITE_AES_CMAC:
1082                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1083                 break;
1084         default:
1085                 /*
1086                  * We can reach here only with HW-only algorithms
1087                  * but why didn't it decrypt the frame?!
1088                  */
1089                 return RX_DROP_UNUSABLE;
1090         }
1091
1092         /* either the frame has been decrypted or will be dropped */
1093         status->flag |= RX_FLAG_DECRYPTED;
1094
1095         return result;
1096 }
1097
1098 static ieee80211_rx_result debug_noinline
1099 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1100 {
1101         struct ieee80211_local *local;
1102         struct ieee80211_hdr *hdr;
1103         struct sk_buff *skb;
1104
1105         local = rx->local;
1106         skb = rx->skb;
1107         hdr = (struct ieee80211_hdr *) skb->data;
1108
1109         if (!local->pspolling)
1110                 return RX_CONTINUE;
1111
1112         if (!ieee80211_has_fromds(hdr->frame_control))
1113                 /* this is not from AP */
1114                 return RX_CONTINUE;
1115
1116         if (!ieee80211_is_data(hdr->frame_control))
1117                 return RX_CONTINUE;
1118
1119         if (!ieee80211_has_moredata(hdr->frame_control)) {
1120                 /* AP has no more frames buffered for us */
1121                 local->pspolling = false;
1122                 return RX_CONTINUE;
1123         }
1124
1125         /* more data bit is set, let's request a new frame from the AP */
1126         ieee80211_send_pspoll(local, rx->sdata);
1127
1128         return RX_CONTINUE;
1129 }
1130
1131 static void ap_sta_ps_start(struct sta_info *sta)
1132 {
1133         struct ieee80211_sub_if_data *sdata = sta->sdata;
1134         struct ieee80211_local *local = sdata->local;
1135
1136         atomic_inc(&sdata->bss->num_sta_ps);
1137         set_sta_flag(sta, WLAN_STA_PS_STA);
1138         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1139                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1140 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1141         printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1142                sdata->name, sta->sta.addr, sta->sta.aid);
1143 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144 }
1145
1146 static void ap_sta_ps_end(struct sta_info *sta)
1147 {
1148 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1149         printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1150                sta->sdata->name, sta->sta.addr, sta->sta.aid);
1151 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1152
1153         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155                 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1156                        sta->sdata->name, sta->sta.addr, sta->sta.aid);
1157 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158                 return;
1159         }
1160
1161         ieee80211_sta_ps_deliver_wakeup(sta);
1162 }
1163
1164 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1165 {
1166         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1167         bool in_ps;
1168
1169         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1170
1171         /* Don't let the same PS state be set twice */
1172         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1173         if ((start && in_ps) || (!start && !in_ps))
1174                 return -EINVAL;
1175
1176         if (start)
1177                 ap_sta_ps_start(sta_inf);
1178         else
1179                 ap_sta_ps_end(sta_inf);
1180
1181         return 0;
1182 }
1183 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1184
1185 static ieee80211_rx_result debug_noinline
1186 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1187 {
1188         struct ieee80211_sub_if_data *sdata = rx->sdata;
1189         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1190         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1191         int tid, ac;
1192
1193         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1194                 return RX_CONTINUE;
1195
1196         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1197             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1198                 return RX_CONTINUE;
1199
1200         /*
1201          * The device handles station powersave, so don't do anything about
1202          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1203          * it to mac80211 since they're handled.)
1204          */
1205         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1206                 return RX_CONTINUE;
1207
1208         /*
1209          * Don't do anything if the station isn't already asleep. In
1210          * the uAPSD case, the station will probably be marked asleep,
1211          * in the PS-Poll case the station must be confused ...
1212          */
1213         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1214                 return RX_CONTINUE;
1215
1216         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1217                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1218                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1219                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1220                         else
1221                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1222                 }
1223
1224                 /* Free PS Poll skb here instead of returning RX_DROP that would
1225                  * count as an dropped frame. */
1226                 dev_kfree_skb(rx->skb);
1227
1228                 return RX_QUEUED;
1229         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1230                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1231                    ieee80211_has_pm(hdr->frame_control) &&
1232                    (ieee80211_is_data_qos(hdr->frame_control) ||
1233                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1234                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1235                 ac = ieee802_1d_to_ac[tid & 7];
1236
1237                 /*
1238                  * If this AC is not trigger-enabled do nothing.
1239                  *
1240                  * NB: This could/should check a separate bitmap of trigger-
1241                  * enabled queues, but for now we only implement uAPSD w/o
1242                  * TSPEC changes to the ACs, so they're always the same.
1243                  */
1244                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1245                         return RX_CONTINUE;
1246
1247                 /* if we are in a service period, do nothing */
1248                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1249                         return RX_CONTINUE;
1250
1251                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1252                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1253                 else
1254                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1255         }
1256
1257         return RX_CONTINUE;
1258 }
1259
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1262 {
1263         struct sta_info *sta = rx->sta;
1264         struct sk_buff *skb = rx->skb;
1265         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1266         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1267
1268         if (!sta)
1269                 return RX_CONTINUE;
1270
1271         /*
1272          * Update last_rx only for IBSS packets which are for the current
1273          * BSSID to avoid keeping the current IBSS network alive in cases
1274          * where other STAs start using different BSSID.
1275          */
1276         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1277                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1278                                                 NL80211_IFTYPE_ADHOC);
1279                 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1280                         sta->last_rx = jiffies;
1281                         if (ieee80211_is_data(hdr->frame_control)) {
1282                                 sta->last_rx_rate_idx = status->rate_idx;
1283                                 sta->last_rx_rate_flag = status->flag;
1284                         }
1285                 }
1286         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1287                 /*
1288                  * Mesh beacons will update last_rx when if they are found to
1289                  * match the current local configuration when processed.
1290                  */
1291                 sta->last_rx = jiffies;
1292                 if (ieee80211_is_data(hdr->frame_control)) {
1293                         sta->last_rx_rate_idx = status->rate_idx;
1294                         sta->last_rx_rate_flag = status->flag;
1295                 }
1296         }
1297
1298         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1299                 return RX_CONTINUE;
1300
1301         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1302                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1303
1304         sta->rx_fragments++;
1305         sta->rx_bytes += rx->skb->len;
1306         sta->last_signal = status->signal;
1307         ewma_add(&sta->avg_signal, -status->signal);
1308
1309         /*
1310          * Change STA power saving mode only at the end of a frame
1311          * exchange sequence.
1312          */
1313         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314             !ieee80211_has_morefrags(hdr->frame_control) &&
1315             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1316             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1318                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1319                         /*
1320                          * Ignore doze->wake transitions that are
1321                          * indicated by non-data frames, the standard
1322                          * is unclear here, but for example going to
1323                          * PS mode and then scanning would cause a
1324                          * doze->wake transition for the probe request,
1325                          * and that is clearly undesirable.
1326                          */
1327                         if (ieee80211_is_data(hdr->frame_control) &&
1328                             !ieee80211_has_pm(hdr->frame_control))
1329                                 ap_sta_ps_end(sta);
1330                 } else {
1331                         if (ieee80211_has_pm(hdr->frame_control))
1332                                 ap_sta_ps_start(sta);
1333                 }
1334         }
1335
1336         /*
1337          * Drop (qos-)data::nullfunc frames silently, since they
1338          * are used only to control station power saving mode.
1339          */
1340         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1342                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1343
1344                 /*
1345                  * If we receive a 4-addr nullfunc frame from a STA
1346                  * that was not moved to a 4-addr STA vlan yet send
1347                  * the event to userspace and for older hostapd drop
1348                  * the frame to the monitor interface.
1349                  */
1350                 if (ieee80211_has_a4(hdr->frame_control) &&
1351                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1353                       !rx->sdata->u.vlan.sta))) {
1354                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355                                 cfg80211_rx_unexpected_4addr_frame(
1356                                         rx->sdata->dev, sta->sta.addr,
1357                                         GFP_ATOMIC);
1358                         return RX_DROP_MONITOR;
1359                 }
1360                 /*
1361                  * Update counter and free packet here to avoid
1362                  * counting this as a dropped packed.
1363                  */
1364                 sta->rx_packets++;
1365                 dev_kfree_skb(rx->skb);
1366                 return RX_QUEUED;
1367         }
1368
1369         return RX_CONTINUE;
1370 } /* ieee80211_rx_h_sta_process */
1371
1372 static inline struct ieee80211_fragment_entry *
1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374                          unsigned int frag, unsigned int seq, int rx_queue,
1375                          struct sk_buff **skb)
1376 {
1377         struct ieee80211_fragment_entry *entry;
1378         int idx;
1379
1380         idx = sdata->fragment_next;
1381         entry = &sdata->fragments[sdata->fragment_next++];
1382         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383                 sdata->fragment_next = 0;
1384
1385         if (!skb_queue_empty(&entry->skb_list)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387                 struct ieee80211_hdr *hdr =
1388                         (struct ieee80211_hdr *) entry->skb_list.next->data;
1389                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1391                        "addr1=%pM addr2=%pM\n",
1392                        sdata->name, idx,
1393                        jiffies - entry->first_frag_time, entry->seq,
1394                        entry->last_frag, hdr->addr1, hdr->addr2);
1395 #endif
1396                 __skb_queue_purge(&entry->skb_list);
1397         }
1398
1399         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1400         *skb = NULL;
1401         entry->first_frag_time = jiffies;
1402         entry->seq = seq;
1403         entry->rx_queue = rx_queue;
1404         entry->last_frag = frag;
1405         entry->ccmp = 0;
1406         entry->extra_len = 0;
1407
1408         return entry;
1409 }
1410
1411 static inline struct ieee80211_fragment_entry *
1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1413                           unsigned int frag, unsigned int seq,
1414                           int rx_queue, struct ieee80211_hdr *hdr)
1415 {
1416         struct ieee80211_fragment_entry *entry;
1417         int i, idx;
1418
1419         idx = sdata->fragment_next;
1420         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421                 struct ieee80211_hdr *f_hdr;
1422
1423                 idx--;
1424                 if (idx < 0)
1425                         idx = IEEE80211_FRAGMENT_MAX - 1;
1426
1427                 entry = &sdata->fragments[idx];
1428                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429                     entry->rx_queue != rx_queue ||
1430                     entry->last_frag + 1 != frag)
1431                         continue;
1432
1433                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1434
1435                 /*
1436                  * Check ftype and addresses are equal, else check next fragment
1437                  */
1438                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1440                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1442                         continue;
1443
1444                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1445                         __skb_queue_purge(&entry->skb_list);
1446                         continue;
1447                 }
1448                 return entry;
1449         }
1450
1451         return NULL;
1452 }
1453
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1456 {
1457         struct ieee80211_hdr *hdr;
1458         u16 sc;
1459         __le16 fc;
1460         unsigned int frag, seq;
1461         struct ieee80211_fragment_entry *entry;
1462         struct sk_buff *skb;
1463         struct ieee80211_rx_status *status;
1464
1465         hdr = (struct ieee80211_hdr *)rx->skb->data;
1466         fc = hdr->frame_control;
1467         sc = le16_to_cpu(hdr->seq_ctrl);
1468         frag = sc & IEEE80211_SCTL_FRAG;
1469
1470         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1471                    (rx->skb)->len < 24 ||
1472                    is_multicast_ether_addr(hdr->addr1))) {
1473                 /* not fragmented */
1474                 goto out;
1475         }
1476         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1477
1478         if (skb_linearize(rx->skb))
1479                 return RX_DROP_UNUSABLE;
1480
1481         /*
1482          *  skb_linearize() might change the skb->data and
1483          *  previously cached variables (in this case, hdr) need to
1484          *  be refreshed with the new data.
1485          */
1486         hdr = (struct ieee80211_hdr *)rx->skb->data;
1487         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1488
1489         if (frag == 0) {
1490                 /* This is the first fragment of a new frame. */
1491                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1492                                                  rx->seqno_idx, &(rx->skb));
1493                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1494                     ieee80211_has_protected(fc)) {
1495                         int queue = rx->security_idx;
1496                         /* Store CCMP PN so that we can verify that the next
1497                          * fragment has a sequential PN value. */
1498                         entry->ccmp = 1;
1499                         memcpy(entry->last_pn,
1500                                rx->key->u.ccmp.rx_pn[queue],
1501                                CCMP_PN_LEN);
1502                 }
1503                 return RX_QUEUED;
1504         }
1505
1506         /* This is a fragment for a frame that should already be pending in
1507          * fragment cache. Add this fragment to the end of the pending entry.
1508          */
1509         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510                                           rx->seqno_idx, hdr);
1511         if (!entry) {
1512                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1513                 return RX_DROP_MONITOR;
1514         }
1515
1516         /* Verify that MPDUs within one MSDU have sequential PN values.
1517          * (IEEE 802.11i, 8.3.3.4.5) */
1518         if (entry->ccmp) {
1519                 int i;
1520                 u8 pn[CCMP_PN_LEN], *rpn;
1521                 int queue;
1522                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1523                         return RX_DROP_UNUSABLE;
1524                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1526                         pn[i]++;
1527                         if (pn[i])
1528                                 break;
1529                 }
1530                 queue = rx->security_idx;
1531                 rpn = rx->key->u.ccmp.rx_pn[queue];
1532                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1533                         return RX_DROP_UNUSABLE;
1534                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1535         }
1536
1537         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1538         __skb_queue_tail(&entry->skb_list, rx->skb);
1539         entry->last_frag = frag;
1540         entry->extra_len += rx->skb->len;
1541         if (ieee80211_has_morefrags(fc)) {
1542                 rx->skb = NULL;
1543                 return RX_QUEUED;
1544         }
1545
1546         rx->skb = __skb_dequeue(&entry->skb_list);
1547         if (skb_tailroom(rx->skb) < entry->extra_len) {
1548                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1550                                               GFP_ATOMIC))) {
1551                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552                         __skb_queue_purge(&entry->skb_list);
1553                         return RX_DROP_UNUSABLE;
1554                 }
1555         }
1556         while ((skb = __skb_dequeue(&entry->skb_list))) {
1557                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1558                 dev_kfree_skb(skb);
1559         }
1560
1561         /* Complete frame has been reassembled - process it now */
1562         status = IEEE80211_SKB_RXCB(rx->skb);
1563         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1564
1565  out:
1566         if (rx->sta)
1567                 rx->sta->rx_packets++;
1568         if (is_multicast_ether_addr(hdr->addr1))
1569                 rx->local->dot11MulticastReceivedFrameCount++;
1570         else
1571                 ieee80211_led_rx(rx->local);
1572         return RX_CONTINUE;
1573 }
1574
1575 static int
1576 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1577 {
1578         if (unlikely(!rx->sta ||
1579             !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1580                 return -EACCES;
1581
1582         return 0;
1583 }
1584
1585 static int
1586 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1587 {
1588         struct sk_buff *skb = rx->skb;
1589         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1590
1591         /*
1592          * Pass through unencrypted frames if the hardware has
1593          * decrypted them already.
1594          */
1595         if (status->flag & RX_FLAG_DECRYPTED)
1596                 return 0;
1597
1598         /* Drop unencrypted frames if key is set. */
1599         if (unlikely(!ieee80211_has_protected(fc) &&
1600                      !ieee80211_is_nullfunc(fc) &&
1601                      ieee80211_is_data(fc) &&
1602                      (rx->key || rx->sdata->drop_unencrypted)))
1603                 return -EACCES;
1604
1605         return 0;
1606 }
1607
1608 static int
1609 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1610 {
1611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1612         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1613         __le16 fc = hdr->frame_control;
1614
1615         /*
1616          * Pass through unencrypted frames if the hardware has
1617          * decrypted them already.
1618          */
1619         if (status->flag & RX_FLAG_DECRYPTED)
1620                 return 0;
1621
1622         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1623                 if (unlikely(!ieee80211_has_protected(fc) &&
1624                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1625                              rx->key)) {
1626                         if (ieee80211_is_deauth(fc))
1627                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1628                                                             rx->skb->data,
1629                                                             rx->skb->len);
1630                         else if (ieee80211_is_disassoc(fc))
1631                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1632                                                               rx->skb->data,
1633                                                               rx->skb->len);
1634                         return -EACCES;
1635                 }
1636                 /* BIP does not use Protected field, so need to check MMIE */
1637                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1638                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1639                         if (ieee80211_is_deauth(fc))
1640                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1641                                                             rx->skb->data,
1642                                                             rx->skb->len);
1643                         else if (ieee80211_is_disassoc(fc))
1644                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1645                                                               rx->skb->data,
1646                                                               rx->skb->len);
1647                         return -EACCES;
1648                 }
1649                 /*
1650                  * When using MFP, Action frames are not allowed prior to
1651                  * having configured keys.
1652                  */
1653                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1654                              ieee80211_is_robust_mgmt_frame(
1655                                      (struct ieee80211_hdr *) rx->skb->data)))
1656                         return -EACCES;
1657         }
1658
1659         return 0;
1660 }
1661
1662 static int
1663 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1664 {
1665         struct ieee80211_sub_if_data *sdata = rx->sdata;
1666         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1667         bool check_port_control = false;
1668         struct ethhdr *ehdr;
1669         int ret;
1670
1671         *port_control = false;
1672         if (ieee80211_has_a4(hdr->frame_control) &&
1673             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1674                 return -1;
1675
1676         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1677             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1678
1679                 if (!sdata->u.mgd.use_4addr)
1680                         return -1;
1681                 else
1682                         check_port_control = true;
1683         }
1684
1685         if (is_multicast_ether_addr(hdr->addr1) &&
1686             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1687                 return -1;
1688
1689         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1690         if (ret < 0)
1691                 return ret;
1692
1693         ehdr = (struct ethhdr *) rx->skb->data;
1694         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1695                 *port_control = true;
1696         else if (check_port_control)
1697                 return -1;
1698
1699         return 0;
1700 }
1701
1702 /*
1703  * requires that rx->skb is a frame with ethernet header
1704  */
1705 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1706 {
1707         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1708                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1710
1711         /*
1712          * Allow EAPOL frames to us/the PAE group address regardless
1713          * of whether the frame was encrypted or not.
1714          */
1715         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1716             (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1717              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1718                 return true;
1719
1720         if (ieee80211_802_1x_port_control(rx) ||
1721             ieee80211_drop_unencrypted(rx, fc))
1722                 return false;
1723
1724         return true;
1725 }
1726
1727 /*
1728  * requires that rx->skb is a frame with ethernet header
1729  */
1730 static void
1731 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1732 {
1733         struct ieee80211_sub_if_data *sdata = rx->sdata;
1734         struct net_device *dev = sdata->dev;
1735         struct sk_buff *skb, *xmit_skb;
1736         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1737         struct sta_info *dsta;
1738         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1739
1740         skb = rx->skb;
1741         xmit_skb = NULL;
1742
1743         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1744              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1745             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1746             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1747             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1748                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1749                         /*
1750                          * send multicast frames both to higher layers in
1751                          * local net stack and back to the wireless medium
1752                          */
1753                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754                         if (!xmit_skb && net_ratelimit())
1755                                 printk(KERN_DEBUG "%s: failed to clone "
1756                                        "multicast frame\n", dev->name);
1757                 } else {
1758                         dsta = sta_info_get(sdata, skb->data);
1759                         if (dsta) {
1760                                 /*
1761                                  * The destination station is associated to
1762                                  * this AP (in this VLAN), so send the frame
1763                                  * directly to it and do not pass it to local
1764                                  * net stack.
1765                                  */
1766                                 xmit_skb = skb;
1767                                 skb = NULL;
1768                         }
1769                 }
1770         }
1771
1772         if (skb) {
1773                 int align __maybe_unused;
1774
1775 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1776                 /*
1777                  * 'align' will only take the values 0 or 2 here
1778                  * since all frames are required to be aligned
1779                  * to 2-byte boundaries when being passed to
1780                  * mac80211. That also explains the __skb_push()
1781                  * below.
1782                  */
1783                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1784                 if (align) {
1785                         if (WARN_ON(skb_headroom(skb) < 3)) {
1786                                 dev_kfree_skb(skb);
1787                                 skb = NULL;
1788                         } else {
1789                                 u8 *data = skb->data;
1790                                 size_t len = skb_headlen(skb);
1791                                 skb->data -= align;
1792                                 memmove(skb->data, data, len);
1793                                 skb_set_tail_pointer(skb, len);
1794                         }
1795                 }
1796 #endif
1797
1798                 if (skb) {
1799                         /* deliver to local stack */
1800                         skb->protocol = eth_type_trans(skb, dev);
1801                         memset(skb->cb, 0, sizeof(skb->cb));
1802                         netif_receive_skb(skb);
1803                 }
1804         }
1805
1806         if (xmit_skb) {
1807                 /*
1808                  * Send to wireless media and increase priority by 256 to
1809                  * keep the received priority instead of reclassifying
1810                  * the frame (see cfg80211_classify8021d).
1811                  */
1812                 xmit_skb->priority += 256;
1813                 xmit_skb->protocol = htons(ETH_P_802_3);
1814                 skb_reset_network_header(xmit_skb);
1815                 skb_reset_mac_header(xmit_skb);
1816                 dev_queue_xmit(xmit_skb);
1817         }
1818 }
1819
1820 static ieee80211_rx_result debug_noinline
1821 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1822 {
1823         struct net_device *dev = rx->sdata->dev;
1824         struct sk_buff *skb = rx->skb;
1825         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1826         __le16 fc = hdr->frame_control;
1827         struct sk_buff_head frame_list;
1828         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1829
1830         if (unlikely(!ieee80211_is_data(fc)))
1831                 return RX_CONTINUE;
1832
1833         if (unlikely(!ieee80211_is_data_present(fc)))
1834                 return RX_DROP_MONITOR;
1835
1836         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1837                 return RX_CONTINUE;
1838
1839         if (ieee80211_has_a4(hdr->frame_control) &&
1840             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841             !rx->sdata->u.vlan.sta)
1842                 return RX_DROP_UNUSABLE;
1843
1844         if (is_multicast_ether_addr(hdr->addr1) &&
1845             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846               rx->sdata->u.vlan.sta) ||
1847              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1848               rx->sdata->u.mgd.use_4addr)))
1849                 return RX_DROP_UNUSABLE;
1850
1851         skb->dev = dev;
1852         __skb_queue_head_init(&frame_list);
1853
1854         if (skb_linearize(skb))
1855                 return RX_DROP_UNUSABLE;
1856
1857         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1858                                  rx->sdata->vif.type,
1859                                  rx->local->hw.extra_tx_headroom, true);
1860
1861         while (!skb_queue_empty(&frame_list)) {
1862                 rx->skb = __skb_dequeue(&frame_list);
1863
1864                 if (!ieee80211_frame_allowed(rx, fc)) {
1865                         dev_kfree_skb(rx->skb);
1866                         continue;
1867                 }
1868                 dev->stats.rx_packets++;
1869                 dev->stats.rx_bytes += rx->skb->len;
1870
1871                 ieee80211_deliver_skb(rx);
1872         }
1873
1874         return RX_QUEUED;
1875 }
1876
1877 #ifdef CONFIG_MAC80211_MESH
1878 static ieee80211_rx_result
1879 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1880 {
1881         struct ieee80211_hdr *fwd_hdr, *hdr;
1882         struct ieee80211_tx_info *info;
1883         struct ieee80211s_hdr *mesh_hdr;
1884         struct sk_buff *skb = rx->skb, *fwd_skb;
1885         struct ieee80211_local *local = rx->local;
1886         struct ieee80211_sub_if_data *sdata = rx->sdata;
1887         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1888         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1889         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1890         u16 q, hdrlen;
1891
1892         hdr = (struct ieee80211_hdr *) skb->data;
1893         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1894         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1895
1896         /* frame is in RMC, don't forward */
1897         if (ieee80211_is_data(hdr->frame_control) &&
1898             is_multicast_ether_addr(hdr->addr1) &&
1899             mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1900                 return RX_DROP_MONITOR;
1901
1902         if (!ieee80211_is_data(hdr->frame_control))
1903                 return RX_CONTINUE;
1904
1905         if (!mesh_hdr->ttl)
1906                 return RX_DROP_MONITOR;
1907
1908         if (mesh_hdr->flags & MESH_FLAGS_AE) {
1909                 struct mesh_path *mppath;
1910                 char *proxied_addr;
1911                 char *mpp_addr;
1912
1913                 if (is_multicast_ether_addr(hdr->addr1)) {
1914                         mpp_addr = hdr->addr3;
1915                         proxied_addr = mesh_hdr->eaddr1;
1916                 } else {
1917                         mpp_addr = hdr->addr4;
1918                         proxied_addr = mesh_hdr->eaddr2;
1919                 }
1920
1921                 rcu_read_lock();
1922                 mppath = mpp_path_lookup(proxied_addr, sdata);
1923                 if (!mppath) {
1924                         mpp_path_add(proxied_addr, mpp_addr, sdata);
1925                 } else {
1926                         spin_lock_bh(&mppath->state_lock);
1927                         if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1928                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1929                         spin_unlock_bh(&mppath->state_lock);
1930                 }
1931                 rcu_read_unlock();
1932         }
1933
1934         /* Frame has reached destination.  Don't forward */
1935         if (!is_multicast_ether_addr(hdr->addr1) &&
1936             compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1937                 return RX_CONTINUE;
1938
1939         q = ieee80211_select_queue_80211(local, skb, hdr);
1940         if (ieee80211_queue_stopped(&local->hw, q)) {
1941                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1942                 return RX_DROP_MONITOR;
1943         }
1944         skb_set_queue_mapping(skb, q);
1945
1946         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1947                 goto out;
1948
1949         if (!--mesh_hdr->ttl) {
1950                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1951                 return RX_DROP_MONITOR;
1952         }
1953
1954         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1955         if (!fwd_skb) {
1956                 if (net_ratelimit())
1957                         printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1958                                         sdata->name);
1959                 goto out;
1960         }
1961
1962         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1963         info = IEEE80211_SKB_CB(fwd_skb);
1964         memset(info, 0, sizeof(*info));
1965         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1966         info->control.vif = &rx->sdata->vif;
1967         info->control.jiffies = jiffies;
1968         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1969                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1970                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1971         } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1972                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1973         } else {
1974                 /* unable to resolve next hop */
1975                 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1976                                     0, reason, fwd_hdr->addr2, sdata);
1977                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1978                 kfree_skb(fwd_skb);
1979                 return RX_DROP_MONITOR;
1980         }
1981
1982         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1983         ieee80211_add_pending_skb(local, fwd_skb);
1984  out:
1985         if (is_multicast_ether_addr(hdr->addr1) ||
1986             sdata->dev->flags & IFF_PROMISC)
1987                 return RX_CONTINUE;
1988         else
1989                 return RX_DROP_MONITOR;
1990 }
1991 #endif
1992
1993 static ieee80211_rx_result debug_noinline
1994 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1995 {
1996         struct ieee80211_sub_if_data *sdata = rx->sdata;
1997         struct ieee80211_local *local = rx->local;
1998         struct net_device *dev = sdata->dev;
1999         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2000         __le16 fc = hdr->frame_control;
2001         bool port_control;
2002         int err;
2003
2004         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2005                 return RX_CONTINUE;
2006
2007         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2008                 return RX_DROP_MONITOR;
2009
2010         /*
2011          * Send unexpected-4addr-frame event to hostapd. For older versions,
2012          * also drop the frame to cooked monitor interfaces.
2013          */
2014         if (ieee80211_has_a4(hdr->frame_control) &&
2015             sdata->vif.type == NL80211_IFTYPE_AP) {
2016                 if (rx->sta &&
2017                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2018                         cfg80211_rx_unexpected_4addr_frame(
2019                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2020                 return RX_DROP_MONITOR;
2021         }
2022
2023         err = __ieee80211_data_to_8023(rx, &port_control);
2024         if (unlikely(err))
2025                 return RX_DROP_UNUSABLE;
2026
2027         if (!ieee80211_frame_allowed(rx, fc))
2028                 return RX_DROP_MONITOR;
2029
2030         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2031             unlikely(port_control) && sdata->bss) {
2032                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2033                                      u.ap);
2034                 dev = sdata->dev;
2035                 rx->sdata = sdata;
2036         }
2037
2038         rx->skb->dev = dev;
2039
2040         dev->stats.rx_packets++;
2041         dev->stats.rx_bytes += rx->skb->len;
2042
2043         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2044             !is_multicast_ether_addr(
2045                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2046             (!local->scanning &&
2047              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2048                         mod_timer(&local->dynamic_ps_timer, jiffies +
2049                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2050         }
2051
2052         ieee80211_deliver_skb(rx);
2053
2054         return RX_QUEUED;
2055 }
2056
2057 static ieee80211_rx_result debug_noinline
2058 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2059 {
2060         struct ieee80211_local *local = rx->local;
2061         struct ieee80211_hw *hw = &local->hw;
2062         struct sk_buff *skb = rx->skb;
2063         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2064         struct tid_ampdu_rx *tid_agg_rx;
2065         u16 start_seq_num;
2066         u16 tid;
2067
2068         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2069                 return RX_CONTINUE;
2070
2071         if (ieee80211_is_back_req(bar->frame_control)) {
2072                 struct {
2073                         __le16 control, start_seq_num;
2074                 } __packed bar_data;
2075
2076                 if (!rx->sta)
2077                         return RX_DROP_MONITOR;
2078
2079                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2080                                   &bar_data, sizeof(bar_data)))
2081                         return RX_DROP_MONITOR;
2082
2083                 tid = le16_to_cpu(bar_data.control) >> 12;
2084
2085                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2086                 if (!tid_agg_rx)
2087                         return RX_DROP_MONITOR;
2088
2089                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2090
2091                 /* reset session timer */
2092                 if (tid_agg_rx->timeout)
2093                         mod_timer(&tid_agg_rx->session_timer,
2094                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2095
2096                 spin_lock(&tid_agg_rx->reorder_lock);
2097                 /* release stored frames up to start of BAR */
2098                 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2099                 spin_unlock(&tid_agg_rx->reorder_lock);
2100
2101                 kfree_skb(skb);
2102                 return RX_QUEUED;
2103         }
2104
2105         /*
2106          * After this point, we only want management frames,
2107          * so we can drop all remaining control frames to
2108          * cooked monitor interfaces.
2109          */
2110         return RX_DROP_MONITOR;
2111 }
2112
2113 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2114                                            struct ieee80211_mgmt *mgmt,
2115                                            size_t len)
2116 {
2117         struct ieee80211_local *local = sdata->local;
2118         struct sk_buff *skb;
2119         struct ieee80211_mgmt *resp;
2120
2121         if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2122                 /* Not to own unicast address */
2123                 return;
2124         }
2125
2126         if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2127             compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2128                 /* Not from the current AP or not associated yet. */
2129                 return;
2130         }
2131
2132         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2133                 /* Too short SA Query request frame */
2134                 return;
2135         }
2136
2137         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2138         if (skb == NULL)
2139                 return;
2140
2141         skb_reserve(skb, local->hw.extra_tx_headroom);
2142         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2143         memset(resp, 0, 24);
2144         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2145         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2146         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2147         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2148                                           IEEE80211_STYPE_ACTION);
2149         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2150         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2151         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2152         memcpy(resp->u.action.u.sa_query.trans_id,
2153                mgmt->u.action.u.sa_query.trans_id,
2154                WLAN_SA_QUERY_TR_ID_LEN);
2155
2156         ieee80211_tx_skb(sdata, skb);
2157 }
2158
2159 static ieee80211_rx_result debug_noinline
2160 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2161 {
2162         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2163         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2164
2165         /*
2166          * From here on, look only at management frames.
2167          * Data and control frames are already handled,
2168          * and unknown (reserved) frames are useless.
2169          */
2170         if (rx->skb->len < 24)
2171                 return RX_DROP_MONITOR;
2172
2173         if (!ieee80211_is_mgmt(mgmt->frame_control))
2174                 return RX_DROP_MONITOR;
2175
2176         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2177             ieee80211_is_beacon(mgmt->frame_control) &&
2178             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2179                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2180                                             rx->skb->data, rx->skb->len,
2181                                             status->freq, GFP_ATOMIC);
2182                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2183         }
2184
2185         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2186                 return RX_DROP_MONITOR;
2187
2188         if (ieee80211_drop_unencrypted_mgmt(rx))
2189                 return RX_DROP_UNUSABLE;
2190
2191         return RX_CONTINUE;
2192 }
2193
2194 static ieee80211_rx_result debug_noinline
2195 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2196 {
2197         struct ieee80211_local *local = rx->local;
2198         struct ieee80211_sub_if_data *sdata = rx->sdata;
2199         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2200         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2201         int len = rx->skb->len;
2202
2203         if (!ieee80211_is_action(mgmt->frame_control))
2204                 return RX_CONTINUE;
2205
2206         /* drop too small frames */
2207         if (len < IEEE80211_MIN_ACTION_SIZE)
2208                 return RX_DROP_UNUSABLE;
2209
2210         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2211                 return RX_DROP_UNUSABLE;
2212
2213         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2214                 return RX_DROP_UNUSABLE;
2215
2216         switch (mgmt->u.action.category) {
2217         case WLAN_CATEGORY_HT:
2218                 /* reject HT action frames from stations not supporting HT */
2219                 if (!rx->sta->sta.ht_cap.ht_supported)
2220                         goto invalid;
2221
2222                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2223                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2224                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2225                     sdata->vif.type != NL80211_IFTYPE_AP &&
2226                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2227                         break;
2228
2229                 /* verify action & smps_control are present */
2230                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2231                         goto invalid;
2232
2233                 switch (mgmt->u.action.u.ht_smps.action) {
2234                 case WLAN_HT_ACTION_SMPS: {
2235                         struct ieee80211_supported_band *sband;
2236                         u8 smps;
2237
2238                         /* convert to HT capability */
2239                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2240                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2241                                 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2242                                 break;
2243                         case WLAN_HT_SMPS_CONTROL_STATIC:
2244                                 smps = WLAN_HT_CAP_SM_PS_STATIC;
2245                                 break;
2246                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2247                                 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2248                                 break;
2249                         default:
2250                                 goto invalid;
2251                         }
2252                         smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2253
2254                         /* if no change do nothing */
2255                         if ((rx->sta->sta.ht_cap.cap &
2256                                         IEEE80211_HT_CAP_SM_PS) == smps)
2257                                 goto handled;
2258
2259                         rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2260                         rx->sta->sta.ht_cap.cap |= smps;
2261
2262                         sband = rx->local->hw.wiphy->bands[status->band];
2263
2264                         rate_control_rate_update(local, sband, rx->sta,
2265                                                  IEEE80211_RC_SMPS_CHANGED,
2266                                                  local->_oper_channel_type);
2267                         goto handled;
2268                 }
2269                 default:
2270                         goto invalid;
2271                 }
2272
2273                 break;
2274         case WLAN_CATEGORY_BACK:
2275                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2276                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2277                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2278                     sdata->vif.type != NL80211_IFTYPE_AP &&
2279                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2280                         break;
2281
2282                 /* verify action_code is present */
2283                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2284                         break;
2285
2286                 switch (mgmt->u.action.u.addba_req.action_code) {
2287                 case WLAN_ACTION_ADDBA_REQ:
2288                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2289                                    sizeof(mgmt->u.action.u.addba_req)))
2290                                 goto invalid;
2291                         break;
2292                 case WLAN_ACTION_ADDBA_RESP:
2293                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2294                                    sizeof(mgmt->u.action.u.addba_resp)))
2295                                 goto invalid;
2296                         break;
2297                 case WLAN_ACTION_DELBA:
2298                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2299                                    sizeof(mgmt->u.action.u.delba)))
2300                                 goto invalid;
2301                         break;
2302                 default:
2303                         goto invalid;
2304                 }
2305
2306                 goto queue;
2307         case WLAN_CATEGORY_SPECTRUM_MGMT:
2308                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2309                         break;
2310
2311                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2312                         break;
2313
2314                 /* verify action_code is present */
2315                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2316                         break;
2317
2318                 switch (mgmt->u.action.u.measurement.action_code) {
2319                 case WLAN_ACTION_SPCT_MSR_REQ:
2320                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2321                                    sizeof(mgmt->u.action.u.measurement)))
2322                                 break;
2323                         ieee80211_process_measurement_req(sdata, mgmt, len);
2324                         goto handled;
2325                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2326                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2327                                    sizeof(mgmt->u.action.u.chan_switch)))
2328                                 break;
2329
2330                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2331                                 break;
2332
2333                         if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2334                                 break;
2335
2336                         goto queue;
2337                 }
2338                 break;
2339         case WLAN_CATEGORY_SA_QUERY:
2340                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2341                            sizeof(mgmt->u.action.u.sa_query)))
2342                         break;
2343
2344                 switch (mgmt->u.action.u.sa_query.action) {
2345                 case WLAN_ACTION_SA_QUERY_REQUEST:
2346                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2347                                 break;
2348                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2349                         goto handled;
2350                 }
2351                 break;
2352         case WLAN_CATEGORY_SELF_PROTECTED:
2353                 switch (mgmt->u.action.u.self_prot.action_code) {
2354                 case WLAN_SP_MESH_PEERING_OPEN:
2355                 case WLAN_SP_MESH_PEERING_CLOSE:
2356                 case WLAN_SP_MESH_PEERING_CONFIRM:
2357                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2358                                 goto invalid;
2359                         if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2360                                 /* userspace handles this frame */
2361                                 break;
2362                         goto queue;
2363                 case WLAN_SP_MGK_INFORM:
2364                 case WLAN_SP_MGK_ACK:
2365                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2366                                 goto invalid;
2367                         break;
2368                 }
2369                 break;
2370         case WLAN_CATEGORY_MESH_ACTION:
2371                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2372                         break;
2373                 if (mesh_action_is_path_sel(mgmt) &&
2374                   (!mesh_path_sel_is_hwmp(sdata)))
2375                         break;
2376                 goto queue;
2377         }
2378
2379         return RX_CONTINUE;
2380
2381  invalid:
2382         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2383         /* will return in the next handlers */
2384         return RX_CONTINUE;
2385
2386  handled:
2387         if (rx->sta)
2388                 rx->sta->rx_packets++;
2389         dev_kfree_skb(rx->skb);
2390         return RX_QUEUED;
2391
2392  queue:
2393         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2394         skb_queue_tail(&sdata->skb_queue, rx->skb);
2395         ieee80211_queue_work(&local->hw, &sdata->work);
2396         if (rx->sta)
2397                 rx->sta->rx_packets++;
2398         return RX_QUEUED;
2399 }
2400
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2403 {
2404         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2405
2406         /* skip known-bad action frames and return them in the next handler */
2407         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2408                 return RX_CONTINUE;
2409
2410         /*
2411          * Getting here means the kernel doesn't know how to handle
2412          * it, but maybe userspace does ... include returned frames
2413          * so userspace can register for those to know whether ones
2414          * it transmitted were processed or returned.
2415          */
2416
2417         if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2418                              rx->skb->data, rx->skb->len,
2419                              GFP_ATOMIC)) {
2420                 if (rx->sta)
2421                         rx->sta->rx_packets++;
2422                 dev_kfree_skb(rx->skb);
2423                 return RX_QUEUED;
2424         }
2425
2426
2427         return RX_CONTINUE;
2428 }
2429
2430 static ieee80211_rx_result debug_noinline
2431 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2432 {
2433         struct ieee80211_local *local = rx->local;
2434         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2435         struct sk_buff *nskb;
2436         struct ieee80211_sub_if_data *sdata = rx->sdata;
2437         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2438
2439         if (!ieee80211_is_action(mgmt->frame_control))
2440                 return RX_CONTINUE;
2441
2442         /*
2443          * For AP mode, hostapd is responsible for handling any action
2444          * frames that we didn't handle, including returning unknown
2445          * ones. For all other modes we will return them to the sender,
2446          * setting the 0x80 bit in the action category, as required by
2447          * 802.11-2007 7.3.1.11.
2448          * Newer versions of hostapd shall also use the management frame
2449          * registration mechanisms, but older ones still use cooked
2450          * monitor interfaces so push all frames there.
2451          */
2452         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2453             (sdata->vif.type == NL80211_IFTYPE_AP ||
2454              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2455                 return RX_DROP_MONITOR;
2456
2457         /* do not return rejected action frames */
2458         if (mgmt->u.action.category & 0x80)
2459                 return RX_DROP_UNUSABLE;
2460
2461         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2462                                GFP_ATOMIC);
2463         if (nskb) {
2464                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2465
2466                 nmgmt->u.action.category |= 0x80;
2467                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2468                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2469
2470                 memset(nskb->cb, 0, sizeof(nskb->cb));
2471
2472                 ieee80211_tx_skb(rx->sdata, nskb);
2473         }
2474         dev_kfree_skb(rx->skb);
2475         return RX_QUEUED;
2476 }
2477
2478 static ieee80211_rx_result debug_noinline
2479 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2480 {
2481         struct ieee80211_sub_if_data *sdata = rx->sdata;
2482         ieee80211_rx_result rxs;
2483         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2484         __le16 stype;
2485
2486         rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2487         if (rxs != RX_CONTINUE)
2488                 return rxs;
2489
2490         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2491
2492         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2493             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2494             sdata->vif.type != NL80211_IFTYPE_STATION)
2495                 return RX_DROP_MONITOR;
2496
2497         switch (stype) {
2498         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2499         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2500                 /* process for all: mesh, mlme, ibss */
2501                 break;
2502         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2503         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2504                 if (is_multicast_ether_addr(mgmt->da) &&
2505                     !is_broadcast_ether_addr(mgmt->da))
2506                         return RX_DROP_MONITOR;
2507
2508                 /* process only for station */
2509                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2510                         return RX_DROP_MONITOR;
2511                 break;
2512         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2513         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2514                 /* process only for ibss */
2515                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2516                         return RX_DROP_MONITOR;
2517                 break;
2518         default:
2519                 return RX_DROP_MONITOR;
2520         }
2521
2522         /* queue up frame and kick off work to process it */
2523         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2524         skb_queue_tail(&sdata->skb_queue, rx->skb);
2525         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2526         if (rx->sta)
2527                 rx->sta->rx_packets++;
2528
2529         return RX_QUEUED;
2530 }
2531
2532 /* TODO: use IEEE80211_RX_FRAGMENTED */
2533 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2534                                         struct ieee80211_rate *rate)
2535 {
2536         struct ieee80211_sub_if_data *sdata;
2537         struct ieee80211_local *local = rx->local;
2538         struct ieee80211_rtap_hdr {
2539                 struct ieee80211_radiotap_header hdr;
2540                 u8 flags;
2541                 u8 rate_or_pad;
2542                 __le16 chan_freq;
2543                 __le16 chan_flags;
2544         } __packed *rthdr;
2545         struct sk_buff *skb = rx->skb, *skb2;
2546         struct net_device *prev_dev = NULL;
2547         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2548
2549         /*
2550          * If cooked monitor has been processed already, then
2551          * don't do it again. If not, set the flag.
2552          */
2553         if (rx->flags & IEEE80211_RX_CMNTR)
2554                 goto out_free_skb;
2555         rx->flags |= IEEE80211_RX_CMNTR;
2556
2557         /* If there are no cooked monitor interfaces, just free the SKB */
2558         if (!local->cooked_mntrs)
2559                 goto out_free_skb;
2560
2561         if (skb_headroom(skb) < sizeof(*rthdr) &&
2562             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2563                 goto out_free_skb;
2564
2565         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2566         memset(rthdr, 0, sizeof(*rthdr));
2567         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2568         rthdr->hdr.it_present =
2569                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2570                             (1 << IEEE80211_RADIOTAP_CHANNEL));
2571
2572         if (rate) {
2573                 rthdr->rate_or_pad = rate->bitrate / 5;
2574                 rthdr->hdr.it_present |=
2575                         cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2576         }
2577         rthdr->chan_freq = cpu_to_le16(status->freq);
2578
2579         if (status->band == IEEE80211_BAND_5GHZ)
2580                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2581                                                 IEEE80211_CHAN_5GHZ);
2582         else
2583                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2584                                                 IEEE80211_CHAN_2GHZ);
2585
2586         skb_set_mac_header(skb, 0);
2587         skb->ip_summed = CHECKSUM_UNNECESSARY;
2588         skb->pkt_type = PACKET_OTHERHOST;
2589         skb->protocol = htons(ETH_P_802_2);
2590
2591         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2592                 if (!ieee80211_sdata_running(sdata))
2593                         continue;
2594
2595                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2596                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2597                         continue;
2598
2599                 if (prev_dev) {
2600                         skb2 = skb_clone(skb, GFP_ATOMIC);
2601                         if (skb2) {
2602                                 skb2->dev = prev_dev;
2603                                 netif_receive_skb(skb2);
2604                         }
2605                 }
2606
2607                 prev_dev = sdata->dev;
2608                 sdata->dev->stats.rx_packets++;
2609                 sdata->dev->stats.rx_bytes += skb->len;
2610         }
2611
2612         if (prev_dev) {
2613                 skb->dev = prev_dev;
2614                 netif_receive_skb(skb);
2615                 return;
2616         }
2617
2618  out_free_skb:
2619         dev_kfree_skb(skb);
2620 }
2621
2622 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2623                                          ieee80211_rx_result res)
2624 {
2625         switch (res) {
2626         case RX_DROP_MONITOR:
2627                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2628                 if (rx->sta)
2629                         rx->sta->rx_dropped++;
2630                 /* fall through */
2631         case RX_CONTINUE: {
2632                 struct ieee80211_rate *rate = NULL;
2633                 struct ieee80211_supported_band *sband;
2634                 struct ieee80211_rx_status *status;
2635
2636                 status = IEEE80211_SKB_RXCB((rx->skb));
2637
2638                 sband = rx->local->hw.wiphy->bands[status->band];
2639                 if (!(status->flag & RX_FLAG_HT))
2640                         rate = &sband->bitrates[status->rate_idx];
2641
2642                 ieee80211_rx_cooked_monitor(rx, rate);
2643                 break;
2644                 }
2645         case RX_DROP_UNUSABLE:
2646                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2647                 if (rx->sta)
2648                         rx->sta->rx_dropped++;
2649                 dev_kfree_skb(rx->skb);
2650                 break;
2651         case RX_QUEUED:
2652                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2653                 break;
2654         }
2655 }
2656
2657 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2658 {
2659         ieee80211_rx_result res = RX_DROP_MONITOR;
2660         struct sk_buff *skb;
2661
2662 #define CALL_RXH(rxh)                   \
2663         do {                            \
2664                 res = rxh(rx);          \
2665                 if (res != RX_CONTINUE) \
2666                         goto rxh_next;  \
2667         } while (0);
2668
2669         spin_lock(&rx->local->rx_skb_queue.lock);
2670         if (rx->local->running_rx_handler)
2671                 goto unlock;
2672
2673         rx->local->running_rx_handler = true;
2674
2675         while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2676                 spin_unlock(&rx->local->rx_skb_queue.lock);
2677
2678                 /*
2679                  * all the other fields are valid across frames
2680                  * that belong to an aMPDU since they are on the
2681                  * same TID from the same station
2682                  */
2683                 rx->skb = skb;
2684
2685                 CALL_RXH(ieee80211_rx_h_decrypt)
2686                 CALL_RXH(ieee80211_rx_h_check_more_data)
2687                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2688                 CALL_RXH(ieee80211_rx_h_sta_process)
2689                 CALL_RXH(ieee80211_rx_h_defragment)
2690                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2691                 /* must be after MMIC verify so header is counted in MPDU mic */
2692 #ifdef CONFIG_MAC80211_MESH
2693                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2694                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2695 #endif
2696                 CALL_RXH(ieee80211_rx_h_amsdu)
2697                 CALL_RXH(ieee80211_rx_h_data)
2698                 CALL_RXH(ieee80211_rx_h_ctrl);
2699                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2700                 CALL_RXH(ieee80211_rx_h_action)
2701                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2702                 CALL_RXH(ieee80211_rx_h_action_return)
2703                 CALL_RXH(ieee80211_rx_h_mgmt)
2704
2705  rxh_next:
2706                 ieee80211_rx_handlers_result(rx, res);
2707                 spin_lock(&rx->local->rx_skb_queue.lock);
2708 #undef CALL_RXH
2709         }
2710
2711         rx->local->running_rx_handler = false;
2712
2713  unlock:
2714         spin_unlock(&rx->local->rx_skb_queue.lock);
2715 }
2716
2717 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2718 {
2719         ieee80211_rx_result res = RX_DROP_MONITOR;
2720
2721 #define CALL_RXH(rxh)                   \
2722         do {                            \
2723                 res = rxh(rx);          \
2724                 if (res != RX_CONTINUE) \
2725                         goto rxh_next;  \
2726         } while (0);
2727
2728         CALL_RXH(ieee80211_rx_h_passive_scan)
2729         CALL_RXH(ieee80211_rx_h_check)
2730
2731         ieee80211_rx_reorder_ampdu(rx);
2732
2733         ieee80211_rx_handlers(rx);
2734         return;
2735
2736  rxh_next:
2737         ieee80211_rx_handlers_result(rx, res);
2738
2739 #undef CALL_RXH
2740 }
2741
2742 /*
2743  * This function makes calls into the RX path, therefore
2744  * it has to be invoked under RCU read lock.
2745  */
2746 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2747 {
2748         struct ieee80211_rx_data rx = {
2749                 .sta = sta,
2750                 .sdata = sta->sdata,
2751                 .local = sta->local,
2752                 /* This is OK -- must be QoS data frame */
2753                 .security_idx = tid,
2754                 .seqno_idx = tid,
2755                 .flags = 0,
2756         };
2757         struct tid_ampdu_rx *tid_agg_rx;
2758
2759         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2760         if (!tid_agg_rx)
2761                 return;
2762
2763         spin_lock(&tid_agg_rx->reorder_lock);
2764         ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2765         spin_unlock(&tid_agg_rx->reorder_lock);
2766
2767         ieee80211_rx_handlers(&rx);
2768 }
2769
2770 /* main receive path */
2771
2772 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2773                                 struct ieee80211_hdr *hdr)
2774 {
2775         struct ieee80211_sub_if_data *sdata = rx->sdata;
2776         struct sk_buff *skb = rx->skb;
2777         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2778         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2779         int multicast = is_multicast_ether_addr(hdr->addr1);
2780
2781         switch (sdata->vif.type) {
2782         case NL80211_IFTYPE_STATION:
2783                 if (!bssid && !sdata->u.mgd.use_4addr)
2784                         return 0;
2785                 if (!multicast &&
2786                     compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2787                         if (!(sdata->dev->flags & IFF_PROMISC) ||
2788                             sdata->u.mgd.use_4addr)
2789                                 return 0;
2790                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2791                 }
2792                 break;
2793         case NL80211_IFTYPE_ADHOC:
2794                 if (!bssid)
2795                         return 0;
2796                 if (ieee80211_is_beacon(hdr->frame_control)) {
2797                         return 1;
2798                 }
2799                 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2800                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2801                                 return 0;
2802                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2803                 } else if (!multicast &&
2804                            compare_ether_addr(sdata->vif.addr,
2805                                               hdr->addr1) != 0) {
2806                         if (!(sdata->dev->flags & IFF_PROMISC))
2807                                 return 0;
2808                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2809                 } else if (!rx->sta) {
2810                         int rate_idx;
2811                         if (status->flag & RX_FLAG_HT)
2812                                 rate_idx = 0; /* TODO: HT rates */
2813                         else
2814                                 rate_idx = status->rate_idx;
2815                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2816                                                  BIT(rate_idx));
2817                 }
2818                 break;
2819         case NL80211_IFTYPE_MESH_POINT:
2820                 if (!multicast &&
2821                     compare_ether_addr(sdata->vif.addr,
2822                                        hdr->addr1) != 0) {
2823                         if (!(sdata->dev->flags & IFF_PROMISC))
2824                                 return 0;
2825
2826                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2827                 }
2828                 break;
2829         case NL80211_IFTYPE_AP_VLAN:
2830         case NL80211_IFTYPE_AP:
2831                 if (!bssid) {
2832                         if (compare_ether_addr(sdata->vif.addr,
2833                                                hdr->addr1))
2834                                 return 0;
2835                 } else if (!ieee80211_bssid_match(bssid,
2836                                         sdata->vif.addr)) {
2837                         /*
2838                          * Accept public action frames even when the
2839                          * BSSID doesn't match, this is used for P2P
2840                          * and location updates. Note that mac80211
2841                          * itself never looks at these frames.
2842                          */
2843                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2844                             ieee80211_is_public_action(hdr, skb->len))
2845                                 return 1;
2846                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2847                             !ieee80211_is_beacon(hdr->frame_control))
2848                                 return 0;
2849                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2850                 }
2851                 break;
2852         case NL80211_IFTYPE_WDS:
2853                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2854                         return 0;
2855                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2856                         return 0;
2857                 break;
2858         default:
2859                 /* should never get here */
2860                 WARN_ON(1);
2861                 break;
2862         }
2863
2864         return 1;
2865 }
2866
2867 /*
2868  * This function returns whether or not the SKB
2869  * was destined for RX processing or not, which,
2870  * if consume is true, is equivalent to whether
2871  * or not the skb was consumed.
2872  */
2873 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2874                                             struct sk_buff *skb, bool consume)
2875 {
2876         struct ieee80211_local *local = rx->local;
2877         struct ieee80211_sub_if_data *sdata = rx->sdata;
2878         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2879         struct ieee80211_hdr *hdr = (void *)skb->data;
2880         int prepares;
2881
2882         rx->skb = skb;
2883         status->rx_flags |= IEEE80211_RX_RA_MATCH;
2884         prepares = prepare_for_handlers(rx, hdr);
2885
2886         if (!prepares)
2887                 return false;
2888
2889         if (!consume) {
2890                 skb = skb_copy(skb, GFP_ATOMIC);
2891                 if (!skb) {
2892                         if (net_ratelimit())
2893                                 wiphy_debug(local->hw.wiphy,
2894                                         "failed to copy skb for %s\n",
2895                                         sdata->name);
2896                         return true;
2897                 }
2898
2899                 rx->skb = skb;
2900         }
2901
2902         ieee80211_invoke_rx_handlers(rx);
2903         return true;
2904 }
2905
2906 /*
2907  * This is the actual Rx frames handler. as it blongs to Rx path it must
2908  * be called with rcu_read_lock protection.
2909  */
2910 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2911                                          struct sk_buff *skb)
2912 {
2913         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2914         struct ieee80211_local *local = hw_to_local(hw);
2915         struct ieee80211_sub_if_data *sdata;
2916         struct ieee80211_hdr *hdr;
2917         __le16 fc;
2918         struct ieee80211_rx_data rx;
2919         struct ieee80211_sub_if_data *prev;
2920         struct sta_info *sta, *tmp, *prev_sta;
2921         int err = 0;
2922
2923         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2924         memset(&rx, 0, sizeof(rx));
2925         rx.skb = skb;
2926         rx.local = local;
2927
2928         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2929                 local->dot11ReceivedFragmentCount++;
2930
2931         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2932                      test_bit(SCAN_SW_SCANNING, &local->scanning)))
2933                 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2934
2935         if (ieee80211_is_mgmt(fc))
2936                 err = skb_linearize(skb);
2937         else
2938                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2939
2940         if (err) {
2941                 dev_kfree_skb(skb);
2942                 return;
2943         }
2944
2945         hdr = (struct ieee80211_hdr *)skb->data;
2946         ieee80211_parse_qos(&rx);
2947         ieee80211_verify_alignment(&rx);
2948
2949         if (ieee80211_is_data(fc)) {
2950                 prev_sta = NULL;
2951
2952                 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2953                         if (!prev_sta) {
2954                                 prev_sta = sta;
2955                                 continue;
2956                         }
2957
2958                         rx.sta = prev_sta;
2959                         rx.sdata = prev_sta->sdata;
2960                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
2961
2962                         prev_sta = sta;
2963                 }
2964
2965                 if (prev_sta) {
2966                         rx.sta = prev_sta;
2967                         rx.sdata = prev_sta->sdata;
2968
2969                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2970                                 return;
2971                         goto out;
2972                 }
2973         }
2974
2975         prev = NULL;
2976
2977         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2978                 if (!ieee80211_sdata_running(sdata))
2979                         continue;
2980
2981                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2982                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2983                         continue;
2984
2985                 /*
2986                  * frame is destined for this interface, but if it's
2987                  * not also for the previous one we handle that after
2988                  * the loop to avoid copying the SKB once too much
2989                  */
2990
2991                 if (!prev) {
2992                         prev = sdata;
2993                         continue;
2994                 }
2995
2996                 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2997                 rx.sdata = prev;
2998                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2999
3000                 prev = sdata;
3001         }
3002
3003         if (prev) {
3004                 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
3005                 rx.sdata = prev;
3006
3007                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3008                         return;
3009         }
3010
3011  out:
3012         dev_kfree_skb(skb);
3013 }
3014
3015 /*
3016  * This is the receive path handler. It is called by a low level driver when an
3017  * 802.11 MPDU is received from the hardware.
3018  */
3019 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3020 {
3021         struct ieee80211_local *local = hw_to_local(hw);
3022         struct ieee80211_rate *rate = NULL;
3023         struct ieee80211_supported_band *sband;
3024         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3025
3026         WARN_ON_ONCE(softirq_count() == 0);
3027
3028         if (WARN_ON(status->band < 0 ||
3029                     status->band >= IEEE80211_NUM_BANDS))
3030                 goto drop;
3031
3032         sband = local->hw.wiphy->bands[status->band];
3033         if (WARN_ON(!sband))
3034                 goto drop;
3035
3036         /*
3037          * If we're suspending, it is possible although not too likely
3038          * that we'd be receiving frames after having already partially
3039          * quiesced the stack. We can't process such frames then since
3040          * that might, for example, cause stations to be added or other
3041          * driver callbacks be invoked.
3042          */
3043         if (unlikely(local->quiescing || local->suspended))
3044                 goto drop;
3045
3046         /*
3047          * The same happens when we're not even started,
3048          * but that's worth a warning.
3049          */
3050         if (WARN_ON(!local->started))
3051                 goto drop;
3052
3053         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3054                 /*
3055                  * Validate the rate, unless a PLCP error means that
3056                  * we probably can't have a valid rate here anyway.
3057                  */
3058
3059                 if (status->flag & RX_FLAG_HT) {
3060                         /*
3061                          * rate_idx is MCS index, which can be [0-76]
3062                          * as documented on:
3063                          *
3064                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3065                          *
3066                          * Anything else would be some sort of driver or
3067                          * hardware error. The driver should catch hardware
3068                          * errors.
3069                          */
3070                         if (WARN((status->rate_idx < 0 ||
3071                                  status->rate_idx > 76),
3072                                  "Rate marked as an HT rate but passed "
3073                                  "status->rate_idx is not "
3074                                  "an MCS index [0-76]: %d (0x%02x)\n",
3075                                  status->rate_idx,
3076                                  status->rate_idx))
3077                                 goto drop;
3078                 } else {
3079                         if (WARN_ON(status->rate_idx < 0 ||
3080                                     status->rate_idx >= sband->n_bitrates))
3081                                 goto drop;
3082                         rate = &sband->bitrates[status->rate_idx];
3083                 }
3084         }
3085
3086         status->rx_flags = 0;
3087
3088         /*
3089          * key references and virtual interfaces are protected using RCU
3090          * and this requires that we are in a read-side RCU section during
3091          * receive processing
3092          */
3093         rcu_read_lock();
3094
3095         /*
3096          * Frames with failed FCS/PLCP checksum are not returned,
3097          * all other frames are returned without radiotap header
3098          * if it was previously present.
3099          * Also, frames with less than 16 bytes are dropped.
3100          */
3101         skb = ieee80211_rx_monitor(local, skb, rate);
3102         if (!skb) {
3103                 rcu_read_unlock();
3104                 return;
3105         }
3106
3107         ieee80211_tpt_led_trig_rx(local,
3108                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3109                         skb->len);
3110         __ieee80211_rx_handle_packet(hw, skb);
3111
3112         rcu_read_unlock();
3113
3114         return;
3115  drop:
3116         kfree_skb(skb);
3117 }
3118 EXPORT_SYMBOL(ieee80211_rx);
3119
3120 /* This is a version of the rx handler that can be called from hard irq
3121  * context. Post the skb on the queue and schedule the tasklet */
3122 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3123 {
3124         struct ieee80211_local *local = hw_to_local(hw);
3125
3126         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3127
3128         skb->pkt_type = IEEE80211_RX_MSG;
3129         skb_queue_tail(&local->skb_queue, skb);
3130         tasklet_schedule(&local->tasklet);
3131 }
3132 EXPORT_SYMBOL(ieee80211_rx_irqsafe);