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 #include <asm/unaligned.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "led.h"
  27 #include "mesh.h"
  28 #include "wep.h"
  29 #include "wpa.h"
  30 #include "tkip.h"
  31 #include "wme.h"
  32 #include "rate.h"
  33
  34 /*
  35  * monitor mode reception
  36  *
  37  * This function cleans up the SKB, i.e. it removes all the stuff
  38  * only useful for monitoring.
  39  */
  40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                            struct sk_buff *skb)
  42 {
  43         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  44                 if (likely(skb->len > FCS_LEN))
  45                         __pskb_trim(skb, skb->len - FCS_LEN);
  46                 else {
  47                         /* driver bug */
  48                         WARN_ON(1);
  49                         dev_kfree_skb(skb);
  50                         skb = NULL;
  51                 }
  52         }
  53
  54         return skb;
  55 }
  56
  57 static inline int should_drop_frame(struct sk_buff *skb,
  58                                     int present_fcs_len)
  59 {
  60         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  61         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  62
  63         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
  64                 return 1;
  65         if (unlikely(skb->len < 16 + present_fcs_len))
  66                 return 1;
  67         if (ieee80211_is_ctl(hdr->frame_control) &&
  68             !ieee80211_is_pspoll(hdr->frame_control) &&
  69             !ieee80211_is_back_req(hdr->frame_control))
  70                 return 1;
  71         return 0;
  72 }
  73
  74 static int
  75 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
  76                           struct ieee80211_rx_status *status)
  77 {
  78         int len;
  79
  80         /* always present fields */
  81         len = sizeof(struct ieee80211_radiotap_header) + 9;
  82
  83         if (status->flag & RX_FLAG_MACTIME_MPDU)
  84                 len += 8;
  85         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  86                 len += 1;
  87
  88         if (len & 1) /* padding for RX_FLAGS if necessary */
  89                 len++;
  90
  91         if (status->flag & RX_FLAG_HT) /* HT info */
  92                 len += 3;
  93
  94         return len;
  95 }
  96
  97 /*
  98  * ieee80211_add_rx_radiotap_header - add radiotap header
  99  *
 100  * add a radiotap header containing all the fields which the hardware provided.
 101  */
 102 static void
 103 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 104                                  struct sk_buff *skb,
 105                                  struct ieee80211_rate *rate,
 106                                  int rtap_len, bool has_fcs)
 107 {
 108         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 109         struct ieee80211_radiotap_header *rthdr;
 110         unsigned char *pos;
 111         u16 rx_flags = 0;
 112
 113         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 114         memset(rthdr, 0, rtap_len);
 115
 116         /* radiotap header, set always present flags */
 117         rthdr->it_present =
 118                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 119                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
 120                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
 121                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
 122         rthdr->it_len = cpu_to_le16(rtap_len);
 123
 124         pos = (unsigned char *)(rthdr+1);
 125
 126         /* the order of the following fields is important */
 127
 128         /* IEEE80211_RADIOTAP_TSFT */
 129         if (status->flag & RX_FLAG_MACTIME_MPDU) {
 130                 put_unaligned_le64(status->mactime, pos);
 131                 rthdr->it_present |=
 132                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 133                 pos += 8;
 134         }
 135
 136         /* IEEE80211_RADIOTAP_FLAGS */
 137         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 138                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 139         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 140                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 141         if (status->flag & RX_FLAG_SHORTPRE)
 142                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 143         pos++;
 144
 145         /* IEEE80211_RADIOTAP_RATE */
 146         if (!rate || status->flag & RX_FLAG_HT) {
 147                 /*
 148                  * Without rate information don't add it. If we have,
 149                  * MCS information is a separate field in radiotap,
 150                  * added below. The byte here is needed as padding
 151                  * for the channel though, so initialise it to 0.
 152                  */
 153                 *pos = 0;
 154         } else {
 155                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 156                 *pos = rate->bitrate / 5;
 157         }
 158         pos++;
 159
 160         /* IEEE80211_RADIOTAP_CHANNEL */
 161         put_unaligned_le16(status->freq, pos);
 162         pos += 2;
 163         if (status->band == IEEE80211_BAND_5GHZ)
 164                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
 165                                    pos);
 166         else if (status->flag & RX_FLAG_HT)
 167                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
 168                                    pos);
 169         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 170                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
 171                                    pos);
 172         else if (rate)
 173                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
 174                                    pos);
 175         else
 176                 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
 177         pos += 2;
 178
 179         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 180         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 181             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 182                 *pos = status->signal;
 183                 rthdr->it_present |=
 184                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 185                 pos++;
 186         }
 187
 188         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 189
 190         /* IEEE80211_RADIOTAP_ANTENNA */
 191         *pos = status->antenna;
 192         pos++;
 193
 194         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 195
 196         /* IEEE80211_RADIOTAP_RX_FLAGS */
 197         /* ensure 2 byte alignment for the 2 byte field as required */
 198         if ((pos - (u8 *)rthdr) & 1)
 199                 pos++;
 200         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 201                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 202         put_unaligned_le16(rx_flags, pos);
 203         pos += 2;
 204
 205         if (status->flag & RX_FLAG_HT) {
 206                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 207                 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 208                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 209                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 210                 *pos = 0;
 211                 if (status->flag & RX_FLAG_SHORT_GI)
 212                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 213                 if (status->flag & RX_FLAG_40MHZ)
 214                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 215                 pos++;
 216                 *pos++ = status->rate_idx;
 217         }
 218 }
 219
 220 /*
 221  * This function copies a received frame to all monitor interfaces and
 222  * returns a cleaned-up SKB that no longer includes the FCS nor the
 223  * radiotap header the driver might have added.
 224  */
 225 static struct sk_buff *
 226 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 227                      struct ieee80211_rate *rate)
 228 {
 229         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 230         struct ieee80211_sub_if_data *sdata;
 231         int needed_headroom;
 232         struct sk_buff *skb, *skb2;
 233         struct net_device *prev_dev = NULL;
 234         int present_fcs_len = 0;
 235
 236         /*
 237          * First, we may need to make a copy of the skb because
 238          *  (1) we need to modify it for radiotap (if not present), and
 239          *  (2) the other RX handlers will modify the skb we got.
 240          *
 241          * We don't need to, of course, if we aren't going to return
 242          * the SKB because it has a bad FCS/PLCP checksum.
 243          */
 244
 245         /* room for the radiotap header based on driver features */
 246         needed_headroom = ieee80211_rx_radiotap_len(local, status);
 247
 248         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 249                 present_fcs_len = FCS_LEN;
 250
 251         /* make sure hdr->frame_control is on the linear part */
 252         if (!pskb_may_pull(origskb, 2)) {
 253                 dev_kfree_skb(origskb);
 254                 return NULL;
 255         }
 256
 257         if (!local->monitors) {
 258                 if (should_drop_frame(origskb, present_fcs_len)) {
 259                         dev_kfree_skb(origskb);
 260                         return NULL;
 261                 }
 262
 263                 return remove_monitor_info(local, origskb);
 264         }
 265
 266         if (should_drop_frame(origskb, present_fcs_len)) {
 267                 /* only need to expand headroom if necessary */
 268                 skb = origskb;
 269                 origskb = NULL;
 270
 271                 /*
 272                  * This shouldn't trigger often because most devices have an
 273                  * RX header they pull before we get here, and that should
 274                  * be big enough for our radiotap information. We should
 275                  * probably export the length to drivers so that we can have
 276                  * them allocate enough headroom to start with.
 277                  */
 278                 if (skb_headroom(skb) < needed_headroom &&
 279                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 280                         dev_kfree_skb(skb);
 281                         return NULL;
 282                 }
 283         } else {
 284                 /*
 285                  * Need to make a copy and possibly remove radiotap header
 286                  * and FCS from the original.
 287                  */
 288                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 289
 290                 origskb = remove_monitor_info(local, origskb);
 291
 292                 if (!skb)
 293                         return origskb;
 294         }
 295
 296         /* prepend radiotap information */
 297         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 298                                          true);
 299
 300         skb_reset_mac_header(skb);
 301         skb->ip_summed = CHECKSUM_UNNECESSARY;
 302         skb->pkt_type = PACKET_OTHERHOST;
 303         skb->protocol = htons(ETH_P_802_2);
 304
 305         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 306                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 307                         continue;
 308
 309                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 310                         continue;
 311
 312                 if (!ieee80211_sdata_running(sdata))
 313                         continue;
 314
 315                 if (prev_dev) {
 316                         skb2 = skb_clone(skb, GFP_ATOMIC);
 317                         if (skb2) {
 318                                 skb2->dev = prev_dev;
 319                                 netif_receive_skb(skb2);
 320                         }
 321                 }
 322
 323                 prev_dev = sdata->dev;
 324                 sdata->dev->stats.rx_packets++;
 325                 sdata->dev->stats.rx_bytes += skb->len;
 326         }
 327
 328         if (prev_dev) {
 329                 skb->dev = prev_dev;
 330                 netif_receive_skb(skb);
 331         } else
 332                 dev_kfree_skb(skb);
 333
 334         return origskb;
 335 }
 336
 337
 338 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 339 {
 340         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 341         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 342         int tid, seqno_idx, security_idx;
 343
 344         /* does the frame have a qos control field? */
 345         if (ieee80211_is_data_qos(hdr->frame_control)) {
 346                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 347                 /* frame has qos control */
 348                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 349                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 350                         status->rx_flags |= IEEE80211_RX_AMSDU;
 351
 352                 seqno_idx = tid;
 353                 security_idx = tid;
 354         } else {
 355                 /*
 356                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 357                  *
 358                  *      Sequence numbers for management frames, QoS data
 359                  *      frames with a broadcast/multicast address in the
 360                  *      Address 1 field, and all non-QoS data frames sent
 361                  *      by QoS STAs are assigned using an additional single
 362                  *      modulo-4096 counter, [...]
 363                  *
 364                  * We also use that counter for non-QoS STAs.
 365                  */
 366                 seqno_idx = NUM_RX_DATA_QUEUES;
 367                 security_idx = 0;
 368                 if (ieee80211_is_mgmt(hdr->frame_control))
 369                         security_idx = NUM_RX_DATA_QUEUES;
 370                 tid = 0;
 371         }
 372
 373         rx->seqno_idx = seqno_idx;
 374         rx->security_idx = security_idx;
 375         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 376          * For now, set skb->priority to 0 for other cases. */
 377         rx->skb->priority = (tid > 7) ? 0 : tid;
 378 }
 379
 380 /**
 381  * DOC: Packet alignment
 382  *
 383  * Drivers always need to pass packets that are aligned to two-byte boundaries
 384  * to the stack.
 385  *
 386  * Additionally, should, if possible, align the payload data in a way that
 387  * guarantees that the contained IP header is aligned to a four-byte
 388  * boundary. In the case of regular frames, this simply means aligning the
 389  * payload to a four-byte boundary (because either the IP header is directly
 390  * contained, or IV/RFC1042 headers that have a length divisible by four are
 391  * in front of it).  If the payload data is not properly aligned and the
 392  * architecture doesn't support efficient unaligned operations, mac80211
 393  * will align the data.
 394  *
 395  * With A-MSDU frames, however, the payload data address must yield two modulo
 396  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 397  * push the IP header further back to a multiple of four again. Thankfully, the
 398  * specs were sane enough this time around to require padding each A-MSDU
 399  * subframe to a length that is a multiple of four.
 400  *
 401  * Padding like Atheros hardware adds which is between the 802.11 header and
 402  * the payload is not supported, the driver is required to move the 802.11
 403  * header to be directly in front of the payload in that case.
 404  */
 405 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 406 {
 407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 408         WARN_ONCE((unsigned long)rx->skb->data & 1,
 409                   "unaligned packet at 0x%p\n", rx->skb->data);
 410 #endif
 411 }
 412
 413
 414 /* rx handlers */
 415
 416 static ieee80211_rx_result debug_noinline
 417 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
 418 {
 419         struct ieee80211_local *local = rx->local;
 420         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 421         struct sk_buff *skb = rx->skb;
 422
 423         if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
 424                    !local->sched_scanning))
 425                 return RX_CONTINUE;
 426
 427         if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 428             test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 429             local->sched_scanning)
 430                 return ieee80211_scan_rx(rx->sdata, skb);
 431
 432         /* scanning finished during invoking of handlers */
 433         I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
 434         return RX_DROP_UNUSABLE;
 435 }
 436
 437
 438 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 439 {
 440         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 441
 442         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 443                 return 0;
 444
 445         return ieee80211_is_robust_mgmt_frame(hdr);
 446 }
 447
 448
 449 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 450 {
 451         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 452
 453         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 454                 return 0;
 455
 456         return ieee80211_is_robust_mgmt_frame(hdr);
 457 }
 458
 459
 460 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 461 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 462 {
 463         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 464         struct ieee80211_mmie *mmie;
 465
 466         if (skb->len < 24 + sizeof(*mmie) ||
 467             !is_multicast_ether_addr(hdr->da))
 468                 return -1;
 469
 470         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 471                 return -1; /* not a robust management frame */
 472
 473         mmie = (struct ieee80211_mmie *)
 474                 (skb->data + skb->len - sizeof(*mmie));
 475         if (mmie->element_id != WLAN_EID_MMIE ||
 476             mmie->length != sizeof(*mmie) - 2)
 477                 return -1;
 478
 479         return le16_to_cpu(mmie->key_id);
 480 }
 481
 482
 483 static ieee80211_rx_result
 484 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 485 {
 486         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 487         char *dev_addr = rx->sdata->vif.addr;
 488
 489         if (ieee80211_is_data(hdr->frame_control)) {
 490                 if (is_multicast_ether_addr(hdr->addr1)) {
 491                         if (ieee80211_has_tods(hdr->frame_control) ||
 492                                 !ieee80211_has_fromds(hdr->frame_control))
 493                                 return RX_DROP_MONITOR;
 494                         if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
 495                                 return RX_DROP_MONITOR;
 496                 } else {
 497                         if (!ieee80211_has_a4(hdr->frame_control))
 498                                 return RX_DROP_MONITOR;
 499                         if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
 500                                 return RX_DROP_MONITOR;
 501                 }
 502         }
 503
 504         /* If there is not an established peer link and this is not a peer link
 505          * establisment frame, beacon or probe, drop the frame.
 506          */
 507
 508         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 509                 struct ieee80211_mgmt *mgmt;
 510
 511                 if (!ieee80211_is_mgmt(hdr->frame_control))
 512                         return RX_DROP_MONITOR;
 513
 514                 if (ieee80211_is_action(hdr->frame_control)) {
 515                         u8 category;
 516                         mgmt = (struct ieee80211_mgmt *)hdr;
 517                         category = mgmt->u.action.category;
 518                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 519                                 category != WLAN_CATEGORY_SELF_PROTECTED)
 520                                 return RX_DROP_MONITOR;
 521                         return RX_CONTINUE;
 522                 }
 523
 524                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 525                     ieee80211_is_probe_resp(hdr->frame_control) ||
 526                     ieee80211_is_beacon(hdr->frame_control) ||
 527                     ieee80211_is_auth(hdr->frame_control))
 528                         return RX_CONTINUE;
 529
 530                 return RX_DROP_MONITOR;
 531
 532         }
 533
 534         return RX_CONTINUE;
 535 }
 536
 537 #define SEQ_MODULO 0x1000
 538 #define SEQ_MASK   0xfff
 539
 540 static inline int seq_less(u16 sq1, u16 sq2)
 541 {
 542         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
 543 }
 544
 545 static inline u16 seq_inc(u16 sq)
 546 {
 547         return (sq + 1) & SEQ_MASK;
 548 }
 549
 550 static inline u16 seq_sub(u16 sq1, u16 sq2)
 551 {
 552         return (sq1 - sq2) & SEQ_MASK;
 553 }
 554
 555
 556 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
 557                                             struct tid_ampdu_rx *tid_agg_rx,
 558                                             int index)
 559 {
 560         struct ieee80211_local *local = hw_to_local(hw);
 561         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 562         struct ieee80211_rx_status *status;
 563
 564         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 565
 566         if (!skb)
 567                 goto no_frame;
 568
 569         /* release the frame from the reorder ring buffer */
 570         tid_agg_rx->stored_mpdu_num--;
 571         tid_agg_rx->reorder_buf[index] = NULL;
 572         status = IEEE80211_SKB_RXCB(skb);
 573         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 574         skb_queue_tail(&local->rx_skb_queue, skb);
 575
 576 no_frame:
 577         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 578 }
 579
 580 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
 581                                              struct tid_ampdu_rx *tid_agg_rx,
 582                                              u16 head_seq_num)
 583 {
 584         int index;
 585
 586         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 587
 588         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 589                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 590                                                         tid_agg_rx->buf_size;
 591                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
 592         }
 593 }
 594
 595 /*
 596  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 597  * the skb was added to the buffer longer than this time ago, the earlier
 598  * frames that have not yet been received are assumed to be lost and the skb
 599  * can be released for processing. This may also release other skb's from the
 600  * reorder buffer if there are no additional gaps between the frames.
 601  *
 602  * Callers must hold tid_agg_rx->reorder_lock.
 603  */
 604 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 605
 606 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
 607                                           struct tid_ampdu_rx *tid_agg_rx)
 608 {
 609         int index, j;
 610
 611         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 612
 613         /* release the buffer until next missing frame */
 614         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 615                                                 tid_agg_rx->buf_size;
 616         if (!tid_agg_rx->reorder_buf[index] &&
 617             tid_agg_rx->stored_mpdu_num) {
 618                 /*
 619                  * No buffers ready to be released, but check whether any
 620                  * frames in the reorder buffer have timed out.
 621                  */
 622                 int skipped = 1;
 623                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 624                      j = (j + 1) % tid_agg_rx->buf_size) {
 625                         if (!tid_agg_rx->reorder_buf[j]) {
 626                                 skipped++;
 627                                 continue;
 628                         }
 629                         if (skipped &&
 630                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 631                                         HT_RX_REORDER_BUF_TIMEOUT))
 632                                 goto set_release_timer;
 633
 634 #ifdef CONFIG_MAC80211_HT_DEBUG
 635                         if (net_ratelimit())
 636                                 wiphy_debug(hw->wiphy,
 637                                             "release an RX reorder frame due to timeout on earlier frames\n");
 638 #endif
 639                         ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
 640
 641                         /*
 642                          * Increment the head seq# also for the skipped slots.
 643                          */
 644                         tid_agg_rx->head_seq_num =
 645                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
 646                         skipped = 0;
 647                 }
 648         } else while (tid_agg_rx->reorder_buf[index]) {
 649                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
 650                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
 651                                                         tid_agg_rx->buf_size;
 652         }
 653
 654         if (tid_agg_rx->stored_mpdu_num) {
 655                 j = index = seq_sub(tid_agg_rx->head_seq_num,
 656                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 657
 658                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 659                      j = (j + 1) % tid_agg_rx->buf_size) {
 660                         if (tid_agg_rx->reorder_buf[j])
 661                                 break;
 662                 }
 663
 664  set_release_timer:
 665
 666                 mod_timer(&tid_agg_rx->reorder_timer,
 667                           tid_agg_rx->reorder_time[j] + 1 +
 668                           HT_RX_REORDER_BUF_TIMEOUT);
 669         } else {
 670                 del_timer(&tid_agg_rx->reorder_timer);
 671         }
 672 }
 673
 674 /*
 675  * As this function belongs to the RX path it must be under
 676  * rcu_read_lock protection. It returns false if the frame
 677  * can be processed immediately, true if it was consumed.
 678  */
 679 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 680                                              struct tid_ampdu_rx *tid_agg_rx,
 681                                              struct sk_buff *skb)
 682 {
 683         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 684         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 685         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 686         u16 head_seq_num, buf_size;
 687         int index;
 688         bool ret = true;
 689
 690         spin_lock(&tid_agg_rx->reorder_lock);
 691
 692         buf_size = tid_agg_rx->buf_size;
 693         head_seq_num = tid_agg_rx->head_seq_num;
 694
 695         /* frame with out of date sequence number */
 696         if (seq_less(mpdu_seq_num, head_seq_num)) {
 697                 dev_kfree_skb(skb);
 698                 goto out;
 699         }
 700
 701         /*
 702          * If frame the sequence number exceeds our buffering window
 703          * size release some previous frames to make room for this one.
 704          */
 705         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
 706                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
 707                 /* release stored frames up to new head to stack */
 708                 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
 709         }
 710
 711         /* Now the new frame is always in the range of the reordering buffer */
 712
 713         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 714
 715         /* check if we already stored this frame */
 716         if (tid_agg_rx->reorder_buf[index]) {
 717                 dev_kfree_skb(skb);
 718                 goto out;
 719         }
 720
 721         /*
 722          * If the current MPDU is in the right order and nothing else
 723          * is stored we can process it directly, no need to buffer it.
 724          * If it is first but there's something stored, we may be able
 725          * to release frames after this one.
 726          */
 727         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 728             tid_agg_rx->stored_mpdu_num == 0) {
 729                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
 730                 ret = false;
 731                 goto out;
 732         }
 733
 734         /* put the frame in the reordering buffer */
 735         tid_agg_rx->reorder_buf[index] = skb;
 736         tid_agg_rx->reorder_time[index] = jiffies;
 737         tid_agg_rx->stored_mpdu_num++;
 738         ieee80211_sta_reorder_release(hw, tid_agg_rx);
 739
 740  out:
 741         spin_unlock(&tid_agg_rx->reorder_lock);
 742         return ret;
 743 }
 744
 745 /*
 746  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 747  * true if the MPDU was buffered, false if it should be processed.
 748  */
 749 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
 750 {
 751         struct sk_buff *skb = rx->skb;
 752         struct ieee80211_local *local = rx->local;
 753         struct ieee80211_hw *hw = &local->hw;
 754         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 755         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 756         struct sta_info *sta = rx->sta;
 757         struct tid_ampdu_rx *tid_agg_rx;
 758         u16 sc;
 759         u8 tid, ack_policy;
 760
 761         if (!ieee80211_is_data_qos(hdr->frame_control))
 762                 goto dont_reorder;
 763
 764         /*
 765          * filter the QoS data rx stream according to
 766          * STA/TID and check if this STA/TID is on aggregation
 767          */
 768
 769         if (!sta)
 770                 goto dont_reorder;
 771
 772         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 773                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 774         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 775
 776         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 777         if (!tid_agg_rx)
 778                 goto dont_reorder;
 779
 780         /* qos null data frames are excluded */
 781         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 782                 goto dont_reorder;
 783
 784         /* not part of a BA session */
 785         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 786             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 787                 goto dont_reorder;
 788
 789         /* not actually part of this BA session */
 790         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 791                 goto dont_reorder;
 792
 793         /* new, potentially un-ordered, ampdu frame - process it */
 794
 795         /* reset session timer */
 796         if (tid_agg_rx->timeout)
 797                 mod_timer(&tid_agg_rx->session_timer,
 798                           TU_TO_EXP_TIME(tid_agg_rx->timeout));
 799
 800         /* if this mpdu is fragmented - terminate rx aggregation session */
 801         sc = le16_to_cpu(hdr->seq_ctrl);
 802         if (sc & IEEE80211_SCTL_FRAG) {
 803                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 804                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 805                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 806                 return;
 807         }
 808
 809         /*
 810          * No locking needed -- we will only ever process one
 811          * RX packet at a time, and thus own tid_agg_rx. All
 812          * other code manipulating it needs to (and does) make
 813          * sure that we cannot get to it any more before doing
 814          * anything with it.
 815          */
 816         if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
 817                 return;
 818
 819  dont_reorder:
 820         skb_queue_tail(&local->rx_skb_queue, skb);
 821 }
 822
 823 static ieee80211_rx_result debug_noinline
 824 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 825 {
 826         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 827         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 828
 829         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
 830         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
 831                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 832                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 833                              hdr->seq_ctrl)) {
 834                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 835                                 rx->local->dot11FrameDuplicateCount++;
 836                                 rx->sta->num_duplicates++;
 837                         }
 838                         return RX_DROP_UNUSABLE;
 839                 } else
 840                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 841         }
 842
 843         if (unlikely(rx->skb->len < 16)) {
 844                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 845                 return RX_DROP_MONITOR;
 846         }
 847
 848         /* Drop disallowed frame classes based on STA auth/assoc state;
 849          * IEEE 802.11, Chap 5.5.
 850          *
 851          * mac80211 filters only based on association state, i.e. it drops
 852          * Class 3 frames from not associated stations. hostapd sends
 853          * deauth/disassoc frames when needed. In addition, hostapd is
 854          * responsible for filtering on both auth and assoc states.
 855          */
 856
 857         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 858                 return ieee80211_rx_mesh_check(rx);
 859
 860         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 861                       ieee80211_is_pspoll(hdr->frame_control)) &&
 862                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 863                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
 864                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
 865                 /*
 866                  * accept port control frames from the AP even when it's not
 867                  * yet marked ASSOC to prevent a race where we don't set the
 868                  * assoc bit quickly enough before it sends the first frame
 869                  */
 870                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
 871                     ieee80211_is_data_present(hdr->frame_control)) {
 872                         u16 ethertype;
 873                         u8 *payload;
 874
 875                         payload = rx->skb->data +
 876                                 ieee80211_hdrlen(hdr->frame_control);
 877                         ethertype = (payload[6] << 8) | payload[7];
 878                         if (cpu_to_be16(ethertype) ==
 879                             rx->sdata->control_port_protocol)
 880                                 return RX_CONTINUE;
 881                 }
 882
 883                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
 884                     cfg80211_rx_spurious_frame(rx->sdata->dev,
 885                                                hdr->addr2,
 886                                                GFP_ATOMIC))
 887                         return RX_DROP_UNUSABLE;
 888
 889                 return RX_DROP_MONITOR;
 890         }
 891
 892         return RX_CONTINUE;
 893 }
 894
 895
 896 static ieee80211_rx_result debug_noinline
 897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
 898 {
 899         struct sk_buff *skb = rx->skb;
 900         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 901         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 902         int keyidx;
 903         int hdrlen;
 904         ieee80211_rx_result result = RX_DROP_UNUSABLE;
 905         struct ieee80211_key *sta_ptk = NULL;
 906         int mmie_keyidx = -1;
 907         __le16 fc;
 908
 909         /*
 910          * Key selection 101
 911          *
 912          * There are four types of keys:
 913          *  - GTK (group keys)
 914          *  - IGTK (group keys for management frames)
 915          *  - PTK (pairwise keys)
 916          *  - STK (station-to-station pairwise keys)
 917          *
 918          * When selecting a key, we have to distinguish between multicast
 919          * (including broadcast) and unicast frames, the latter can only
 920          * use PTKs and STKs while the former always use GTKs and IGTKs.
 921          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
 922          * unicast frames can also use key indices like GTKs. Hence, if we
 923          * don't have a PTK/STK we check the key index for a WEP key.
 924          *
 925          * Note that in a regular BSS, multicast frames are sent by the
 926          * AP only, associated stations unicast the frame to the AP first
 927          * which then multicasts it on their behalf.
 928          *
 929          * There is also a slight problem in IBSS mode: GTKs are negotiated
 930          * with each station, that is something we don't currently handle.
 931          * The spec seems to expect that one negotiates the same key with
 932          * every station but there's no such requirement; VLANs could be
 933          * possible.
 934          */
 935
 936         /*
 937          * No point in finding a key and decrypting if the frame is neither
 938          * addressed to us nor a multicast frame.
 939          */
 940         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 941                 return RX_CONTINUE;
 942
 943         /* start without a key */
 944         rx->key = NULL;
 945
 946         if (rx->sta)
 947                 sta_ptk = rcu_dereference(rx->sta->ptk);
 948
 949         fc = hdr->frame_control;
 950
 951         if (!ieee80211_has_protected(fc))
 952                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
 953
 954         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
 955                 rx->key = sta_ptk;
 956                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 957                     (status->flag & RX_FLAG_IV_STRIPPED))
 958                         return RX_CONTINUE;
 959                 /* Skip decryption if the frame is not protected. */
 960                 if (!ieee80211_has_protected(fc))
 961                         return RX_CONTINUE;
 962         } else if (mmie_keyidx >= 0) {
 963                 /* Broadcast/multicast robust management frame / BIP */
 964                 if ((status->flag & RX_FLAG_DECRYPTED) &&
 965                     (status->flag & RX_FLAG_IV_STRIPPED))
 966                         return RX_CONTINUE;
 967
 968                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
 969                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 970                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
 971                 if (rx->sta)
 972                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
 973                 if (!rx->key)
 974                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
 975         } else if (!ieee80211_has_protected(fc)) {
 976                 /*
 977                  * The frame was not protected, so skip decryption. However, we
 978                  * need to set rx->key if there is a key that could have been
 979                  * used so that the frame may be dropped if encryption would
 980                  * have been expected.
 981                  */
 982                 struct ieee80211_key *key = NULL;
 983                 struct ieee80211_sub_if_data *sdata = rx->sdata;
 984                 int i;
 985
 986                 if (ieee80211_is_mgmt(fc) &&
 987                     is_multicast_ether_addr(hdr->addr1) &&
 988                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
 989                         rx->key = key;
 990                 else {
 991                         if (rx->sta) {
 992                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 993                                         key = rcu_dereference(rx->sta->gtk[i]);
 994                                         if (key)
 995                                                 break;
 996                                 }
 997                         }
 998                         if (!key) {
 999                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1000                                         key = rcu_dereference(sdata->keys[i]);
1001                                         if (key)
1002                                                 break;
1003                                 }
1004                         }
1005                         if (key)
1006                                 rx->key = key;
1007                 }
1008                 return RX_CONTINUE;
1009         } else {
1010                 u8 keyid;
1011                 /*
1012                  * The device doesn't give us the IV so we won't be
1013                  * able to look up the key. That's ok though, we
1014                  * don't need to decrypt the frame, we just won't
1015                  * be able to keep statistics accurate.
1016                  * Except for key threshold notifications, should
1017                  * we somehow allow the driver to tell us which key
1018                  * the hardware used if this flag is set?
1019                  */
1020                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1021                     (status->flag & RX_FLAG_IV_STRIPPED))
1022                         return RX_CONTINUE;
1023
1024                 hdrlen = ieee80211_hdrlen(fc);
1025
1026                 if (rx->skb->len < 8 + hdrlen)
1027                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1028
1029                 /*
1030                  * no need to call ieee80211_wep_get_keyidx,
1031                  * it verifies a bunch of things we've done already
1032                  */
1033                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1034                 keyidx = keyid >> 6;
1035
1036                 /* check per-station GTK first, if multicast packet */
1037                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1038                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1039
1040                 /* if not found, try default key */
1041                 if (!rx->key) {
1042                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1043
1044                         /*
1045                          * RSNA-protected unicast frames should always be
1046                          * sent with pairwise or station-to-station keys,
1047                          * but for WEP we allow using a key index as well.
1048                          */
1049                         if (rx->key &&
1050                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1051                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1052                             !is_multicast_ether_addr(hdr->addr1))
1053                                 rx->key = NULL;
1054                 }
1055         }
1056
1057         if (rx->key) {
1058                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1059                         return RX_DROP_MONITOR;
1060
1061                 rx->key->tx_rx_count++;
1062                 /* TODO: add threshold stuff again */
1063         } else {
1064                 return RX_DROP_MONITOR;
1065         }
1066
1067         switch (rx->key->conf.cipher) {
1068         case WLAN_CIPHER_SUITE_WEP40:
1069         case WLAN_CIPHER_SUITE_WEP104:
1070                 result = ieee80211_crypto_wep_decrypt(rx);
1071                 break;
1072         case WLAN_CIPHER_SUITE_TKIP:
1073                 result = ieee80211_crypto_tkip_decrypt(rx);
1074                 break;
1075         case WLAN_CIPHER_SUITE_CCMP:
1076                 result = ieee80211_crypto_ccmp_decrypt(rx);
1077                 break;
1078         case WLAN_CIPHER_SUITE_AES_CMAC:
1079                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1080                 break;
1081         default:
1082                 /*
1083                  * We can reach here only with HW-only algorithms
1084                  * but why didn't it decrypt the frame?!
1085                  */
1086                 return RX_DROP_UNUSABLE;
1087         }
1088
1089         /* the hdr variable is invalid after the decrypt handlers */
1090
1091         /* either the frame has been decrypted or will be dropped */
1092         status->flag |= RX_FLAG_DECRYPTED;
1093
1094         return result;
1095 }
1096
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1099 {
1100         struct ieee80211_local *local;
1101         struct ieee80211_hdr *hdr;
1102         struct sk_buff *skb;
1103
1104         local = rx->local;
1105         skb = rx->skb;
1106         hdr = (struct ieee80211_hdr *) skb->data;
1107
1108         if (!local->pspolling)
1109                 return RX_CONTINUE;
1110
1111         if (!ieee80211_has_fromds(hdr->frame_control))
1112                 /* this is not from AP */
1113                 return RX_CONTINUE;
1114
1115         if (!ieee80211_is_data(hdr->frame_control))
1116                 return RX_CONTINUE;
1117
1118         if (!ieee80211_has_moredata(hdr->frame_control)) {
1119                 /* AP has no more frames buffered for us */
1120                 local->pspolling = false;
1121                 return RX_CONTINUE;
1122         }
1123
1124         /* more data bit is set, let's request a new frame from the AP */
1125         ieee80211_send_pspoll(local, rx->sdata);
1126
1127         return RX_CONTINUE;
1128 }
1129
1130 static void ap_sta_ps_start(struct sta_info *sta)
1131 {
1132         struct ieee80211_sub_if_data *sdata = sta->sdata;
1133         struct ieee80211_local *local = sdata->local;
1134
1135         atomic_inc(&sdata->bss->num_sta_ps);
1136         set_sta_flag(sta, WLAN_STA_PS_STA);
1137         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1139 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1140         printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1141                sdata->name, sta->sta.addr, sta->sta.aid);
1142 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143 }
1144
1145 static void ap_sta_ps_end(struct sta_info *sta)
1146 {
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148         printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1149                sta->sdata->name, sta->sta.addr, sta->sta.aid);
1150 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1151
1152         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154                 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1155                        sta->sdata->name, sta->sta.addr, sta->sta.aid);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1157                 return;
1158         }
1159
1160         ieee80211_sta_ps_deliver_wakeup(sta);
1161 }
1162
1163 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1164 {
1165         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1166         bool in_ps;
1167
1168         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1169
1170         /* Don't let the same PS state be set twice */
1171         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1172         if ((start && in_ps) || (!start && !in_ps))
1173                 return -EINVAL;
1174
1175         if (start)
1176                 ap_sta_ps_start(sta_inf);
1177         else
1178                 ap_sta_ps_end(sta_inf);
1179
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1183
1184 static ieee80211_rx_result debug_noinline
1185 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1186 {
1187         struct ieee80211_sub_if_data *sdata = rx->sdata;
1188         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1190         int tid, ac;
1191
1192         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1193                 return RX_CONTINUE;
1194
1195         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1197                 return RX_CONTINUE;
1198
1199         /*
1200          * The device handles station powersave, so don't do anything about
1201          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202          * it to mac80211 since they're handled.)
1203          */
1204         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1205                 return RX_CONTINUE;
1206
1207         /*
1208          * Don't do anything if the station isn't already asleep. In
1209          * the uAPSD case, the station will probably be marked asleep,
1210          * in the PS-Poll case the station must be confused ...
1211          */
1212         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1213                 return RX_CONTINUE;
1214
1215         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1216                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1218                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1219                         else
1220                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1221                 }
1222
1223                 /* Free PS Poll skb here instead of returning RX_DROP that would
1224                  * count as an dropped frame. */
1225                 dev_kfree_skb(rx->skb);
1226
1227                 return RX_QUEUED;
1228         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230                    ieee80211_has_pm(hdr->frame_control) &&
1231                    (ieee80211_is_data_qos(hdr->frame_control) ||
1232                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234                 ac = ieee802_1d_to_ac[tid & 7];
1235
1236                 /*
1237                  * If this AC is not trigger-enabled do nothing.
1238                  *
1239                  * NB: This could/should check a separate bitmap of trigger-
1240                  * enabled queues, but for now we only implement uAPSD w/o
1241                  * TSPEC changes to the ACs, so they're always the same.
1242                  */
1243                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1244                         return RX_CONTINUE;
1245
1246                 /* if we are in a service period, do nothing */
1247                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1248                         return RX_CONTINUE;
1249
1250                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1251                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1252                 else
1253                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1254         }
1255
1256         return RX_CONTINUE;
1257 }
1258
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1261 {
1262         struct sta_info *sta = rx->sta;
1263         struct sk_buff *skb = rx->skb;
1264         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1266
1267         if (!sta)
1268                 return RX_CONTINUE;
1269
1270         /*
1271          * Update last_rx only for IBSS packets which are for the current
1272          * BSSID to avoid keeping the current IBSS network alive in cases
1273          * where other STAs start using different BSSID.
1274          */
1275         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1276                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1277                                                 NL80211_IFTYPE_ADHOC);
1278                 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1279                         sta->last_rx = jiffies;
1280                         if (ieee80211_is_data(hdr->frame_control)) {
1281                                 sta->last_rx_rate_idx = status->rate_idx;
1282                                 sta->last_rx_rate_flag = status->flag;
1283                         }
1284                 }
1285         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1286                 /*
1287                  * Mesh beacons will update last_rx when if they are found to
1288                  * match the current local configuration when processed.
1289                  */
1290                 sta->last_rx = jiffies;
1291                 if (ieee80211_is_data(hdr->frame_control)) {
1292                         sta->last_rx_rate_idx = status->rate_idx;
1293                         sta->last_rx_rate_flag = status->flag;
1294                 }
1295         }
1296
1297         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1298                 return RX_CONTINUE;
1299
1300         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1302
1303         sta->rx_fragments++;
1304         sta->rx_bytes += rx->skb->len;
1305         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1306                 sta->last_signal = status->signal;
1307                 ewma_add(&sta->avg_signal, -status->signal);
1308         }
1309
1310         /*
1311          * Change STA power saving mode only at the end of a frame
1312          * exchange sequence.
1313          */
1314         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1315             !ieee80211_has_morefrags(hdr->frame_control) &&
1316             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1317             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1318              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1319                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1320                         /*
1321                          * Ignore doze->wake transitions that are
1322                          * indicated by non-data frames, the standard
1323                          * is unclear here, but for example going to
1324                          * PS mode and then scanning would cause a
1325                          * doze->wake transition for the probe request,
1326                          * and that is clearly undesirable.
1327                          */
1328                         if (ieee80211_is_data(hdr->frame_control) &&
1329                             !ieee80211_has_pm(hdr->frame_control))
1330                                 ap_sta_ps_end(sta);
1331                 } else {
1332                         if (ieee80211_has_pm(hdr->frame_control))
1333                                 ap_sta_ps_start(sta);
1334                 }
1335         }
1336
1337         /*
1338          * Drop (qos-)data::nullfunc frames silently, since they
1339          * are used only to control station power saving mode.
1340          */
1341         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1343                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1344
1345                 /*
1346                  * If we receive a 4-addr nullfunc frame from a STA
1347                  * that was not moved to a 4-addr STA vlan yet send
1348                  * the event to userspace and for older hostapd drop
1349                  * the frame to the monitor interface.
1350                  */
1351                 if (ieee80211_has_a4(hdr->frame_control) &&
1352                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1354                       !rx->sdata->u.vlan.sta))) {
1355                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356                                 cfg80211_rx_unexpected_4addr_frame(
1357                                         rx->sdata->dev, sta->sta.addr,
1358                                         GFP_ATOMIC);
1359                         return RX_DROP_MONITOR;
1360                 }
1361                 /*
1362                  * Update counter and free packet here to avoid
1363                  * counting this as a dropped packed.
1364                  */
1365                 sta->rx_packets++;
1366                 dev_kfree_skb(rx->skb);
1367                 return RX_QUEUED;
1368         }
1369
1370         return RX_CONTINUE;
1371 } /* ieee80211_rx_h_sta_process */
1372
1373 static inline struct ieee80211_fragment_entry *
1374 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1375                          unsigned int frag, unsigned int seq, int rx_queue,
1376                          struct sk_buff **skb)
1377 {
1378         struct ieee80211_fragment_entry *entry;
1379         int idx;
1380
1381         idx = sdata->fragment_next;
1382         entry = &sdata->fragments[sdata->fragment_next++];
1383         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1384                 sdata->fragment_next = 0;
1385
1386         if (!skb_queue_empty(&entry->skb_list)) {
1387 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1388                 struct ieee80211_hdr *hdr =
1389                         (struct ieee80211_hdr *) entry->skb_list.next->data;
1390                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1391                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1392                        "addr1=%pM addr2=%pM\n",
1393                        sdata->name, idx,
1394                        jiffies - entry->first_frag_time, entry->seq,
1395                        entry->last_frag, hdr->addr1, hdr->addr2);
1396 #endif
1397                 __skb_queue_purge(&entry->skb_list);
1398         }
1399
1400         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401         *skb = NULL;
1402         entry->first_frag_time = jiffies;
1403         entry->seq = seq;
1404         entry->rx_queue = rx_queue;
1405         entry->last_frag = frag;
1406         entry->ccmp = 0;
1407         entry->extra_len = 0;
1408
1409         return entry;
1410 }
1411
1412 static inline struct ieee80211_fragment_entry *
1413 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1414                           unsigned int frag, unsigned int seq,
1415                           int rx_queue, struct ieee80211_hdr *hdr)
1416 {
1417         struct ieee80211_fragment_entry *entry;
1418         int i, idx;
1419
1420         idx = sdata->fragment_next;
1421         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1422                 struct ieee80211_hdr *f_hdr;
1423
1424                 idx--;
1425                 if (idx < 0)
1426                         idx = IEEE80211_FRAGMENT_MAX - 1;
1427
1428                 entry = &sdata->fragments[idx];
1429                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1430                     entry->rx_queue != rx_queue ||
1431                     entry->last_frag + 1 != frag)
1432                         continue;
1433
1434                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1435
1436                 /*
1437                  * Check ftype and addresses are equal, else check next fragment
1438                  */
1439                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1440                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1441                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1442                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1443                         continue;
1444
1445                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1446                         __skb_queue_purge(&entry->skb_list);
1447                         continue;
1448                 }
1449                 return entry;
1450         }
1451
1452         return NULL;
1453 }
1454
1455 static ieee80211_rx_result debug_noinline
1456 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1457 {
1458         struct ieee80211_hdr *hdr;
1459         u16 sc;
1460         __le16 fc;
1461         unsigned int frag, seq;
1462         struct ieee80211_fragment_entry *entry;
1463         struct sk_buff *skb;
1464         struct ieee80211_rx_status *status;
1465
1466         hdr = (struct ieee80211_hdr *)rx->skb->data;
1467         fc = hdr->frame_control;
1468         sc = le16_to_cpu(hdr->seq_ctrl);
1469         frag = sc & IEEE80211_SCTL_FRAG;
1470
1471         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1472                    (rx->skb)->len < 24 ||
1473                    is_multicast_ether_addr(hdr->addr1))) {
1474                 /* not fragmented */
1475                 goto out;
1476         }
1477         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478
1479         if (skb_linearize(rx->skb))
1480                 return RX_DROP_UNUSABLE;
1481
1482         /*
1483          *  skb_linearize() might change the skb->data and
1484          *  previously cached variables (in this case, hdr) need to
1485          *  be refreshed with the new data.
1486          */
1487         hdr = (struct ieee80211_hdr *)rx->skb->data;
1488         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1489
1490         if (frag == 0) {
1491                 /* This is the first fragment of a new frame. */
1492                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1493                                                  rx->seqno_idx, &(rx->skb));
1494                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1495                     ieee80211_has_protected(fc)) {
1496                         int queue = rx->security_idx;
1497                         /* Store CCMP PN so that we can verify that the next
1498                          * fragment has a sequential PN value. */
1499                         entry->ccmp = 1;
1500                         memcpy(entry->last_pn,
1501                                rx->key->u.ccmp.rx_pn[queue],
1502                                CCMP_PN_LEN);
1503                 }
1504                 return RX_QUEUED;
1505         }
1506
1507         /* This is a fragment for a frame that should already be pending in
1508          * fragment cache. Add this fragment to the end of the pending entry.
1509          */
1510         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1511                                           rx->seqno_idx, hdr);
1512         if (!entry) {
1513                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1514                 return RX_DROP_MONITOR;
1515         }
1516
1517         /* Verify that MPDUs within one MSDU have sequential PN values.
1518          * (IEEE 802.11i, 8.3.3.4.5) */
1519         if (entry->ccmp) {
1520                 int i;
1521                 u8 pn[CCMP_PN_LEN], *rpn;
1522                 int queue;
1523                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1524                         return RX_DROP_UNUSABLE;
1525                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1526                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1527                         pn[i]++;
1528                         if (pn[i])
1529                                 break;
1530                 }
1531                 queue = rx->security_idx;
1532                 rpn = rx->key->u.ccmp.rx_pn[queue];
1533                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1534                         return RX_DROP_UNUSABLE;
1535                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1536         }
1537
1538         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1539         __skb_queue_tail(&entry->skb_list, rx->skb);
1540         entry->last_frag = frag;
1541         entry->extra_len += rx->skb->len;
1542         if (ieee80211_has_morefrags(fc)) {
1543                 rx->skb = NULL;
1544                 return RX_QUEUED;
1545         }
1546
1547         rx->skb = __skb_dequeue(&entry->skb_list);
1548         if (skb_tailroom(rx->skb) < entry->extra_len) {
1549                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1550                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551                                               GFP_ATOMIC))) {
1552                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1553                         __skb_queue_purge(&entry->skb_list);
1554                         return RX_DROP_UNUSABLE;
1555                 }
1556         }
1557         while ((skb = __skb_dequeue(&entry->skb_list))) {
1558                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1559                 dev_kfree_skb(skb);
1560         }
1561
1562         /* Complete frame has been reassembled - process it now */
1563         status = IEEE80211_SKB_RXCB(rx->skb);
1564         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1565
1566  out:
1567         if (rx->sta)
1568                 rx->sta->rx_packets++;
1569         if (is_multicast_ether_addr(hdr->addr1))
1570                 rx->local->dot11MulticastReceivedFrameCount++;
1571         else
1572                 ieee80211_led_rx(rx->local);
1573         return RX_CONTINUE;
1574 }
1575
1576 static int
1577 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1578 {
1579         if (unlikely(!rx->sta ||
1580             !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1581                 return -EACCES;
1582
1583         return 0;
1584 }
1585
1586 static int
1587 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1588 {
1589         struct sk_buff *skb = rx->skb;
1590         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1591
1592         /*
1593          * Pass through unencrypted frames if the hardware has
1594          * decrypted them already.
1595          */
1596         if (status->flag & RX_FLAG_DECRYPTED)
1597                 return 0;
1598
1599         /* Drop unencrypted frames if key is set. */
1600         if (unlikely(!ieee80211_has_protected(fc) &&
1601                      !ieee80211_is_nullfunc(fc) &&
1602                      ieee80211_is_data(fc) &&
1603                      (rx->key || rx->sdata->drop_unencrypted)))
1604                 return -EACCES;
1605
1606         return 0;
1607 }
1608
1609 static int
1610 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611 {
1612         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1613         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1614         __le16 fc = hdr->frame_control;
1615
1616         /*
1617          * Pass through unencrypted frames if the hardware has
1618          * decrypted them already.
1619          */
1620         if (status->flag & RX_FLAG_DECRYPTED)
1621                 return 0;
1622
1623         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1624                 if (unlikely(!ieee80211_has_protected(fc) &&
1625                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1626                              rx->key)) {
1627                         if (ieee80211_is_deauth(fc))
1628                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1629                                                             rx->skb->data,
1630                                                             rx->skb->len);
1631                         else if (ieee80211_is_disassoc(fc))
1632                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1633                                                               rx->skb->data,
1634                                                               rx->skb->len);
1635                         return -EACCES;
1636                 }
1637                 /* BIP does not use Protected field, so need to check MMIE */
1638                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1639                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1640                         if (ieee80211_is_deauth(fc))
1641                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1642                                                             rx->skb->data,
1643                                                             rx->skb->len);
1644                         else if (ieee80211_is_disassoc(fc))
1645                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1646                                                               rx->skb->data,
1647                                                               rx->skb->len);
1648                         return -EACCES;
1649                 }
1650                 /*
1651                  * When using MFP, Action frames are not allowed prior to
1652                  * having configured keys.
1653                  */
1654                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1655                              ieee80211_is_robust_mgmt_frame(
1656                                      (struct ieee80211_hdr *) rx->skb->data)))
1657                         return -EACCES;
1658         }
1659
1660         return 0;
1661 }
1662
1663 static int
1664 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1665 {
1666         struct ieee80211_sub_if_data *sdata = rx->sdata;
1667         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1668         bool check_port_control = false;
1669         struct ethhdr *ehdr;
1670         int ret;
1671
1672         *port_control = false;
1673         if (ieee80211_has_a4(hdr->frame_control) &&
1674             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1675                 return -1;
1676
1677         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1678             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679
1680                 if (!sdata->u.mgd.use_4addr)
1681                         return -1;
1682                 else
1683                         check_port_control = true;
1684         }
1685
1686         if (is_multicast_ether_addr(hdr->addr1) &&
1687             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1688                 return -1;
1689
1690         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1691         if (ret < 0)
1692                 return ret;
1693
1694         ehdr = (struct ethhdr *) rx->skb->data;
1695         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1696                 *port_control = true;
1697         else if (check_port_control)
1698                 return -1;
1699
1700         return 0;
1701 }
1702
1703 /*
1704  * requires that rx->skb is a frame with ethernet header
1705  */
1706 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1707 {
1708         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1709                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1710         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1711
1712         /*
1713          * Allow EAPOL frames to us/the PAE group address regardless
1714          * of whether the frame was encrypted or not.
1715          */
1716         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1717             (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1718              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1719                 return true;
1720
1721         if (ieee80211_802_1x_port_control(rx) ||
1722             ieee80211_drop_unencrypted(rx, fc))
1723                 return false;
1724
1725         return true;
1726 }
1727
1728 /*
1729  * requires that rx->skb is a frame with ethernet header
1730  */
1731 static void
1732 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1733 {
1734         struct ieee80211_sub_if_data *sdata = rx->sdata;
1735         struct net_device *dev = sdata->dev;
1736         struct sk_buff *skb, *xmit_skb;
1737         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1738         struct sta_info *dsta;
1739         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1740
1741         skb = rx->skb;
1742         xmit_skb = NULL;
1743
1744         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1745              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1746             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1747             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1748             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1749                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750                         /*
1751                          * send multicast frames both to higher layers in
1752                          * local net stack and back to the wireless medium
1753                          */
1754                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1755                         if (!xmit_skb && net_ratelimit())
1756                                 printk(KERN_DEBUG "%s: failed to clone "
1757                                        "multicast frame\n", dev->name);
1758                 } else {
1759                         dsta = sta_info_get(sdata, skb->data);
1760                         if (dsta) {
1761                                 /*
1762                                  * The destination station is associated to
1763                                  * this AP (in this VLAN), so send the frame
1764                                  * directly to it and do not pass it to local
1765                                  * net stack.
1766                                  */
1767                                 xmit_skb = skb;
1768                                 skb = NULL;
1769                         }
1770                 }
1771         }
1772
1773         if (skb) {
1774                 int align __maybe_unused;
1775
1776 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1777                 /*
1778                  * 'align' will only take the values 0 or 2 here
1779                  * since all frames are required to be aligned
1780                  * to 2-byte boundaries when being passed to
1781                  * mac80211. That also explains the __skb_push()
1782                  * below.
1783                  */
1784                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1785                 if (align) {
1786                         if (WARN_ON(skb_headroom(skb) < 3)) {
1787                                 dev_kfree_skb(skb);
1788                                 skb = NULL;
1789                         } else {
1790                                 u8 *data = skb->data;
1791                                 size_t len = skb_headlen(skb);
1792                                 skb->data -= align;
1793                                 memmove(skb->data, data, len);
1794                                 skb_set_tail_pointer(skb, len);
1795                         }
1796                 }
1797 #endif
1798
1799                 if (skb) {
1800                         /* deliver to local stack */
1801                         skb->protocol = eth_type_trans(skb, dev);
1802                         memset(skb->cb, 0, sizeof(skb->cb));
1803                         netif_receive_skb(skb);
1804                 }
1805         }
1806
1807         if (xmit_skb) {
1808                 /*
1809                  * Send to wireless media and increase priority by 256 to
1810                  * keep the received priority instead of reclassifying
1811                  * the frame (see cfg80211_classify8021d).
1812                  */
1813                 xmit_skb->priority += 256;
1814                 xmit_skb->protocol = htons(ETH_P_802_3);
1815                 skb_reset_network_header(xmit_skb);
1816                 skb_reset_mac_header(xmit_skb);
1817                 dev_queue_xmit(xmit_skb);
1818         }
1819 }
1820
1821 static ieee80211_rx_result debug_noinline
1822 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1823 {
1824         struct net_device *dev = rx->sdata->dev;
1825         struct sk_buff *skb = rx->skb;
1826         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1827         __le16 fc = hdr->frame_control;
1828         struct sk_buff_head frame_list;
1829         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1830
1831         if (unlikely(!ieee80211_is_data(fc)))
1832                 return RX_CONTINUE;
1833
1834         if (unlikely(!ieee80211_is_data_present(fc)))
1835                 return RX_DROP_MONITOR;
1836
1837         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1838                 return RX_CONTINUE;
1839
1840         if (ieee80211_has_a4(hdr->frame_control) &&
1841             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842             !rx->sdata->u.vlan.sta)
1843                 return RX_DROP_UNUSABLE;
1844
1845         if (is_multicast_ether_addr(hdr->addr1) &&
1846             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847               rx->sdata->u.vlan.sta) ||
1848              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1849               rx->sdata->u.mgd.use_4addr)))
1850                 return RX_DROP_UNUSABLE;
1851
1852         skb->dev = dev;
1853         __skb_queue_head_init(&frame_list);
1854
1855         if (skb_linearize(skb))
1856                 return RX_DROP_UNUSABLE;
1857
1858         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1859                                  rx->sdata->vif.type,
1860                                  rx->local->hw.extra_tx_headroom, true);
1861
1862         while (!skb_queue_empty(&frame_list)) {
1863                 rx->skb = __skb_dequeue(&frame_list);
1864
1865                 if (!ieee80211_frame_allowed(rx, fc)) {
1866                         dev_kfree_skb(rx->skb);
1867                         continue;
1868                 }
1869                 dev->stats.rx_packets++;
1870                 dev->stats.rx_bytes += rx->skb->len;
1871
1872                 ieee80211_deliver_skb(rx);
1873         }
1874
1875         return RX_QUEUED;
1876 }
1877
1878 #ifdef CONFIG_MAC80211_MESH
1879 static ieee80211_rx_result
1880 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881 {
1882         struct ieee80211_hdr *fwd_hdr, *hdr;
1883         struct ieee80211_tx_info *info;
1884         struct ieee80211s_hdr *mesh_hdr;
1885         struct sk_buff *skb = rx->skb, *fwd_skb;
1886         struct ieee80211_local *local = rx->local;
1887         struct ieee80211_sub_if_data *sdata = rx->sdata;
1888         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1889         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1890         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1891         u16 q, hdrlen;
1892
1893         hdr = (struct ieee80211_hdr *) skb->data;
1894         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1895         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896
1897         /* frame is in RMC, don't forward */
1898         if (ieee80211_is_data(hdr->frame_control) &&
1899             is_multicast_ether_addr(hdr->addr1) &&
1900             mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1901                 return RX_DROP_MONITOR;
1902
1903         if (!ieee80211_is_data(hdr->frame_control))
1904                 return RX_CONTINUE;
1905
1906         if (!mesh_hdr->ttl)
1907                 return RX_DROP_MONITOR;
1908
1909         if (mesh_hdr->flags & MESH_FLAGS_AE) {
1910                 struct mesh_path *mppath;
1911                 char *proxied_addr;
1912                 char *mpp_addr;
1913
1914                 if (is_multicast_ether_addr(hdr->addr1)) {
1915                         mpp_addr = hdr->addr3;
1916                         proxied_addr = mesh_hdr->eaddr1;
1917                 } else {
1918                         mpp_addr = hdr->addr4;
1919                         proxied_addr = mesh_hdr->eaddr2;
1920                 }
1921
1922                 rcu_read_lock();
1923                 mppath = mpp_path_lookup(proxied_addr, sdata);
1924                 if (!mppath) {
1925                         mpp_path_add(proxied_addr, mpp_addr, sdata);
1926                 } else {
1927                         spin_lock_bh(&mppath->state_lock);
1928                         if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1929                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1930                         spin_unlock_bh(&mppath->state_lock);
1931                 }
1932                 rcu_read_unlock();
1933         }
1934
1935         /* Frame has reached destination.  Don't forward */
1936         if (!is_multicast_ether_addr(hdr->addr1) &&
1937             compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1938                 return RX_CONTINUE;
1939
1940         q = ieee80211_select_queue_80211(local, skb, hdr);
1941         if (ieee80211_queue_stopped(&local->hw, q)) {
1942                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1943                 return RX_DROP_MONITOR;
1944         }
1945         skb_set_queue_mapping(skb, q);
1946
1947         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1948                 goto out;
1949
1950         if (!--mesh_hdr->ttl) {
1951                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1952                 return RX_DROP_MONITOR;
1953         }
1954
1955         if (!ifmsh->mshcfg.dot11MeshForwarding)
1956                 goto out;
1957
1958         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1959         if (!fwd_skb) {
1960                 if (net_ratelimit())
1961                         printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1962                                         sdata->name);
1963                 goto out;
1964         }
1965
1966         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1967         info = IEEE80211_SKB_CB(fwd_skb);
1968         memset(info, 0, sizeof(*info));
1969         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1970         info->control.vif = &rx->sdata->vif;
1971         info->control.jiffies = jiffies;
1972         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1973                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1974                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1975         } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1976                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1977         } else {
1978                 /* unable to resolve next hop */
1979                 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1980                                     0, reason, fwd_hdr->addr2, sdata);
1981                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1982                 kfree_skb(fwd_skb);
1983                 return RX_DROP_MONITOR;
1984         }
1985
1986         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1987         ieee80211_add_pending_skb(local, fwd_skb);
1988  out:
1989         if (is_multicast_ether_addr(hdr->addr1) ||
1990             sdata->dev->flags & IFF_PROMISC)
1991                 return RX_CONTINUE;
1992         else
1993                 return RX_DROP_MONITOR;
1994 }
1995 #endif
1996
1997 static ieee80211_rx_result debug_noinline
1998 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1999 {
2000         struct ieee80211_sub_if_data *sdata = rx->sdata;
2001         struct ieee80211_local *local = rx->local;
2002         struct net_device *dev = sdata->dev;
2003         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2004         __le16 fc = hdr->frame_control;
2005         bool port_control;
2006         int err;
2007
2008         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2009                 return RX_CONTINUE;
2010
2011         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2012                 return RX_DROP_MONITOR;
2013
2014         /*
2015          * Send unexpected-4addr-frame event to hostapd. For older versions,
2016          * also drop the frame to cooked monitor interfaces.
2017          */
2018         if (ieee80211_has_a4(hdr->frame_control) &&
2019             sdata->vif.type == NL80211_IFTYPE_AP) {
2020                 if (rx->sta &&
2021                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2022                         cfg80211_rx_unexpected_4addr_frame(
2023                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2024                 return RX_DROP_MONITOR;
2025         }
2026
2027         err = __ieee80211_data_to_8023(rx, &port_control);
2028         if (unlikely(err))
2029                 return RX_DROP_UNUSABLE;
2030
2031         if (!ieee80211_frame_allowed(rx, fc))
2032                 return RX_DROP_MONITOR;
2033
2034         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2035             unlikely(port_control) && sdata->bss) {
2036                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2037                                      u.ap);
2038                 dev = sdata->dev;
2039                 rx->sdata = sdata;
2040         }
2041
2042         rx->skb->dev = dev;
2043
2044         dev->stats.rx_packets++;
2045         dev->stats.rx_bytes += rx->skb->len;
2046
2047         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2048             !is_multicast_ether_addr(
2049                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2050             (!local->scanning &&
2051              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2052                         mod_timer(&local->dynamic_ps_timer, jiffies +
2053                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2054         }
2055
2056         ieee80211_deliver_skb(rx);
2057
2058         return RX_QUEUED;
2059 }
2060
2061 static ieee80211_rx_result debug_noinline
2062 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2063 {
2064         struct ieee80211_local *local = rx->local;
2065         struct ieee80211_hw *hw = &local->hw;
2066         struct sk_buff *skb = rx->skb;
2067         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2068         struct tid_ampdu_rx *tid_agg_rx;
2069         u16 start_seq_num;
2070         u16 tid;
2071
2072         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2073                 return RX_CONTINUE;
2074
2075         if (ieee80211_is_back_req(bar->frame_control)) {
2076                 struct {
2077                         __le16 control, start_seq_num;
2078                 } __packed bar_data;
2079
2080                 if (!rx->sta)
2081                         return RX_DROP_MONITOR;
2082
2083                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2084                                   &bar_data, sizeof(bar_data)))
2085                         return RX_DROP_MONITOR;
2086
2087                 tid = le16_to_cpu(bar_data.control) >> 12;
2088
2089                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2090                 if (!tid_agg_rx)
2091                         return RX_DROP_MONITOR;
2092
2093                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2094
2095                 /* reset session timer */
2096                 if (tid_agg_rx->timeout)
2097                         mod_timer(&tid_agg_rx->session_timer,
2098                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2099
2100                 spin_lock(&tid_agg_rx->reorder_lock);
2101                 /* release stored frames up to start of BAR */
2102                 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2103                 spin_unlock(&tid_agg_rx->reorder_lock);
2104
2105                 kfree_skb(skb);
2106                 return RX_QUEUED;
2107         }
2108
2109         /*
2110          * After this point, we only want management frames,
2111          * so we can drop all remaining control frames to
2112          * cooked monitor interfaces.
2113          */
2114         return RX_DROP_MONITOR;
2115 }
2116
2117 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2118                                            struct ieee80211_mgmt *mgmt,
2119                                            size_t len)
2120 {
2121         struct ieee80211_local *local = sdata->local;
2122         struct sk_buff *skb;
2123         struct ieee80211_mgmt *resp;
2124
2125         if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2126                 /* Not to own unicast address */
2127                 return;
2128         }
2129
2130         if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2131             compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2132                 /* Not from the current AP or not associated yet. */
2133                 return;
2134         }
2135
2136         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2137                 /* Too short SA Query request frame */
2138                 return;
2139         }
2140
2141         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2142         if (skb == NULL)
2143                 return;
2144
2145         skb_reserve(skb, local->hw.extra_tx_headroom);
2146         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2147         memset(resp, 0, 24);
2148         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2149         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2150         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2151         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2152                                           IEEE80211_STYPE_ACTION);
2153         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2154         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2155         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2156         memcpy(resp->u.action.u.sa_query.trans_id,
2157                mgmt->u.action.u.sa_query.trans_id,
2158                WLAN_SA_QUERY_TR_ID_LEN);
2159
2160         ieee80211_tx_skb(sdata, skb);
2161 }
2162
2163 static ieee80211_rx_result debug_noinline
2164 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2165 {
2166         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2167         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2168
2169         /*
2170          * From here on, look only at management frames.
2171          * Data and control frames are already handled,
2172          * and unknown (reserved) frames are useless.
2173          */
2174         if (rx->skb->len < 24)
2175                 return RX_DROP_MONITOR;
2176
2177         if (!ieee80211_is_mgmt(mgmt->frame_control))
2178                 return RX_DROP_MONITOR;
2179
2180         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2181             ieee80211_is_beacon(mgmt->frame_control) &&
2182             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2183                 int sig = 0;
2184
2185                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2186                         sig = status->signal;
2187
2188                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2189                                             rx->skb->data, rx->skb->len,
2190                                             status->freq, sig, GFP_ATOMIC);
2191                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2192         }
2193
2194         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2195                 return RX_DROP_MONITOR;
2196
2197         if (ieee80211_drop_unencrypted_mgmt(rx))
2198                 return RX_DROP_UNUSABLE;
2199
2200         return RX_CONTINUE;
2201 }
2202
2203 static ieee80211_rx_result debug_noinline
2204 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2205 {
2206         struct ieee80211_local *local = rx->local;
2207         struct ieee80211_sub_if_data *sdata = rx->sdata;
2208         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2209         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2210         int len = rx->skb->len;
2211
2212         if (!ieee80211_is_action(mgmt->frame_control))
2213                 return RX_CONTINUE;
2214
2215         /* drop too small frames */
2216         if (len < IEEE80211_MIN_ACTION_SIZE)
2217                 return RX_DROP_UNUSABLE;
2218
2219         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2220                 return RX_DROP_UNUSABLE;
2221
2222         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2223                 return RX_DROP_UNUSABLE;
2224
2225         switch (mgmt->u.action.category) {
2226         case WLAN_CATEGORY_HT:
2227                 /* reject HT action frames from stations not supporting HT */
2228                 if (!rx->sta->sta.ht_cap.ht_supported)
2229                         goto invalid;
2230
2231                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2232                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2233                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2234                     sdata->vif.type != NL80211_IFTYPE_AP &&
2235                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2236                         break;
2237
2238                 /* verify action & smps_control are present */
2239                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2240                         goto invalid;
2241
2242                 switch (mgmt->u.action.u.ht_smps.action) {
2243                 case WLAN_HT_ACTION_SMPS: {
2244                         struct ieee80211_supported_band *sband;
2245                         u8 smps;
2246
2247                         /* convert to HT capability */
2248                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2249                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2250                                 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2251                                 break;
2252                         case WLAN_HT_SMPS_CONTROL_STATIC:
2253                                 smps = WLAN_HT_CAP_SM_PS_STATIC;
2254                                 break;
2255                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2256                                 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2257                                 break;
2258                         default:
2259                                 goto invalid;
2260                         }
2261                         smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2262
2263                         /* if no change do nothing */
2264                         if ((rx->sta->sta.ht_cap.cap &
2265                                         IEEE80211_HT_CAP_SM_PS) == smps)
2266                                 goto handled;
2267
2268                         rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2269                         rx->sta->sta.ht_cap.cap |= smps;
2270
2271                         sband = rx->local->hw.wiphy->bands[status->band];
2272
2273                         rate_control_rate_update(
2274                                 local, sband, rx->sta,
2275                                 IEEE80211_RC_SMPS_CHANGED,
2276                                 ieee80211_get_tx_channel_type(
2277                                         local, local->_oper_channel_type));
2278                         goto handled;
2279                 }
2280                 default:
2281                         goto invalid;
2282                 }
2283
2284                 break;
2285         case WLAN_CATEGORY_BACK:
2286                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2287                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2288                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2289                     sdata->vif.type != NL80211_IFTYPE_AP &&
2290                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2291                         break;
2292
2293                 /* verify action_code is present */
2294                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2295                         break;
2296
2297                 switch (mgmt->u.action.u.addba_req.action_code) {
2298                 case WLAN_ACTION_ADDBA_REQ:
2299                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2300                                    sizeof(mgmt->u.action.u.addba_req)))
2301                                 goto invalid;
2302                         break;
2303                 case WLAN_ACTION_ADDBA_RESP:
2304                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2305                                    sizeof(mgmt->u.action.u.addba_resp)))
2306                                 goto invalid;
2307                         break;
2308                 case WLAN_ACTION_DELBA:
2309                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2310                                    sizeof(mgmt->u.action.u.delba)))
2311                                 goto invalid;
2312                         break;
2313                 default:
2314                         goto invalid;
2315                 }
2316
2317                 goto queue;
2318         case WLAN_CATEGORY_SPECTRUM_MGMT:
2319                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2320                         break;
2321
2322                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2323                         break;
2324
2325                 /* verify action_code is present */
2326                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2327                         break;
2328
2329                 switch (mgmt->u.action.u.measurement.action_code) {
2330                 case WLAN_ACTION_SPCT_MSR_REQ:
2331                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2332                                    sizeof(mgmt->u.action.u.measurement)))
2333                                 break;
2334                         ieee80211_process_measurement_req(sdata, mgmt, len);
2335                         goto handled;
2336                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2337                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2338                                    sizeof(mgmt->u.action.u.chan_switch)))
2339                                 break;
2340
2341                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2342                                 break;
2343
2344                         if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
2345                                 break;
2346
2347                         goto queue;
2348                 }
2349                 break;
2350         case WLAN_CATEGORY_SA_QUERY:
2351                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2352                            sizeof(mgmt->u.action.u.sa_query)))
2353                         break;
2354
2355                 switch (mgmt->u.action.u.sa_query.action) {
2356                 case WLAN_ACTION_SA_QUERY_REQUEST:
2357                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2358                                 break;
2359                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2360                         goto handled;
2361                 }
2362                 break;
2363         case WLAN_CATEGORY_SELF_PROTECTED:
2364                 switch (mgmt->u.action.u.self_prot.action_code) {
2365                 case WLAN_SP_MESH_PEERING_OPEN:
2366                 case WLAN_SP_MESH_PEERING_CLOSE:
2367                 case WLAN_SP_MESH_PEERING_CONFIRM:
2368                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2369                                 goto invalid;
2370                         if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2371                                 /* userspace handles this frame */
2372                                 break;
2373                         goto queue;
2374                 case WLAN_SP_MGK_INFORM:
2375                 case WLAN_SP_MGK_ACK:
2376                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2377                                 goto invalid;
2378                         break;
2379                 }
2380                 break;
2381         case WLAN_CATEGORY_MESH_ACTION:
2382                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2383                         break;
2384                 if (mesh_action_is_path_sel(mgmt) &&
2385                   (!mesh_path_sel_is_hwmp(sdata)))
2386                         break;
2387                 goto queue;
2388         }
2389
2390         return RX_CONTINUE;
2391
2392  invalid:
2393         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2394         /* will return in the next handlers */
2395         return RX_CONTINUE;
2396
2397  handled:
2398         if (rx->sta)
2399                 rx->sta->rx_packets++;
2400         dev_kfree_skb(rx->skb);
2401         return RX_QUEUED;
2402
2403  queue:
2404         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2405         skb_queue_tail(&sdata->skb_queue, rx->skb);
2406         ieee80211_queue_work(&local->hw, &sdata->work);
2407         if (rx->sta)
2408                 rx->sta->rx_packets++;
2409         return RX_QUEUED;
2410 }
2411
2412 static ieee80211_rx_result debug_noinline
2413 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2414 {
2415         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2416         int sig = 0;
2417
2418         /* skip known-bad action frames and return them in the next handler */
2419         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2420                 return RX_CONTINUE;
2421
2422         /*
2423          * Getting here means the kernel doesn't know how to handle
2424          * it, but maybe userspace does ... include returned frames
2425          * so userspace can register for those to know whether ones
2426          * it transmitted were processed or returned.
2427          */
2428
2429         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2430                 sig = status->signal;
2431
2432         if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2433                              rx->skb->data, rx->skb->len,
2434                              GFP_ATOMIC)) {
2435                 if (rx->sta)
2436                         rx->sta->rx_packets++;
2437                 dev_kfree_skb(rx->skb);
2438                 return RX_QUEUED;
2439         }
2440
2441
2442         return RX_CONTINUE;
2443 }
2444
2445 static ieee80211_rx_result debug_noinline
2446 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2447 {
2448         struct ieee80211_local *local = rx->local;
2449         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2450         struct sk_buff *nskb;
2451         struct ieee80211_sub_if_data *sdata = rx->sdata;
2452         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2453
2454         if (!ieee80211_is_action(mgmt->frame_control))
2455                 return RX_CONTINUE;
2456
2457         /*
2458          * For AP mode, hostapd is responsible for handling any action
2459          * frames that we didn't handle, including returning unknown
2460          * ones. For all other modes we will return them to the sender,
2461          * setting the 0x80 bit in the action category, as required by
2462          * 802.11-2012 9.24.4.
2463          * Newer versions of hostapd shall also use the management frame
2464          * registration mechanisms, but older ones still use cooked
2465          * monitor interfaces so push all frames there.
2466          */
2467         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2468             (sdata->vif.type == NL80211_IFTYPE_AP ||
2469              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2470                 return RX_DROP_MONITOR;
2471
2472         if (is_multicast_ether_addr(mgmt->da))
2473                 return RX_DROP_MONITOR;
2474
2475         /* do not return rejected action frames */
2476         if (mgmt->u.action.category & 0x80)
2477                 return RX_DROP_UNUSABLE;
2478
2479         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2480                                GFP_ATOMIC);
2481         if (nskb) {
2482                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2483
2484                 nmgmt->u.action.category |= 0x80;
2485                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2486                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2487
2488                 memset(nskb->cb, 0, sizeof(nskb->cb));
2489
2490                 ieee80211_tx_skb(rx->sdata, nskb);
2491         }
2492         dev_kfree_skb(rx->skb);
2493         return RX_QUEUED;
2494 }
2495
2496 static ieee80211_rx_result debug_noinline
2497 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2498 {
2499         struct ieee80211_sub_if_data *sdata = rx->sdata;
2500         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2501         __le16 stype;
2502
2503         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2504
2505         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2506             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2507             sdata->vif.type != NL80211_IFTYPE_STATION)
2508                 return RX_DROP_MONITOR;
2509
2510         switch (stype) {
2511         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2512         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2513         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2514                 /* process for all: mesh, mlme, ibss */
2515                 break;
2516         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2517         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2518         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2519         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2520                 if (is_multicast_ether_addr(mgmt->da) &&
2521                     !is_broadcast_ether_addr(mgmt->da))
2522                         return RX_DROP_MONITOR;
2523
2524                 /* process only for station */
2525                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2526                         return RX_DROP_MONITOR;
2527                 break;
2528         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2529                 /* process only for ibss */
2530                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2531                         return RX_DROP_MONITOR;
2532                 break;
2533         default:
2534                 return RX_DROP_MONITOR;
2535         }
2536
2537         /* queue up frame and kick off work to process it */
2538         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2539         skb_queue_tail(&sdata->skb_queue, rx->skb);
2540         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2541         if (rx->sta)
2542                 rx->sta->rx_packets++;
2543
2544         return RX_QUEUED;
2545 }
2546
2547 /* TODO: use IEEE80211_RX_FRAGMENTED */
2548 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2549                                         struct ieee80211_rate *rate)
2550 {
2551         struct ieee80211_sub_if_data *sdata;
2552         struct ieee80211_local *local = rx->local;
2553         struct sk_buff *skb = rx->skb, *skb2;
2554         struct net_device *prev_dev = NULL;
2555         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2556         int needed_headroom;
2557
2558         /*
2559          * If cooked monitor has been processed already, then
2560          * don't do it again. If not, set the flag.
2561          */
2562         if (rx->flags & IEEE80211_RX_CMNTR)
2563                 goto out_free_skb;
2564         rx->flags |= IEEE80211_RX_CMNTR;
2565
2566         /* If there are no cooked monitor interfaces, just free the SKB */
2567         if (!local->cooked_mntrs)
2568                 goto out_free_skb;
2569
2570         /* room for the radiotap header based on driver features */
2571         needed_headroom = ieee80211_rx_radiotap_len(local, status);
2572
2573         if (skb_headroom(skb) < needed_headroom &&
2574             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2575                 goto out_free_skb;
2576
2577         /* prepend radiotap information */
2578         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2579                                          false);
2580
2581         skb_set_mac_header(skb, 0);
2582         skb->ip_summed = CHECKSUM_UNNECESSARY;
2583         skb->pkt_type = PACKET_OTHERHOST;
2584         skb->protocol = htons(ETH_P_802_2);
2585
2586         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2587                 if (!ieee80211_sdata_running(sdata))
2588                         continue;
2589
2590                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2591                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2592                         continue;
2593
2594                 if (prev_dev) {
2595                         skb2 = skb_clone(skb, GFP_ATOMIC);
2596                         if (skb2) {
2597                                 skb2->dev = prev_dev;
2598                                 netif_receive_skb(skb2);
2599                         }
2600                 }
2601
2602                 prev_dev = sdata->dev;
2603                 sdata->dev->stats.rx_packets++;
2604                 sdata->dev->stats.rx_bytes += skb->len;
2605         }
2606
2607         if (prev_dev) {
2608                 skb->dev = prev_dev;
2609                 netif_receive_skb(skb);
2610                 return;
2611         }
2612
2613  out_free_skb:
2614         dev_kfree_skb(skb);
2615 }
2616
2617 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2618                                          ieee80211_rx_result res)
2619 {
2620         switch (res) {
2621         case RX_DROP_MONITOR:
2622                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2623                 if (rx->sta)
2624                         rx->sta->rx_dropped++;
2625                 /* fall through */
2626         case RX_CONTINUE: {
2627                 struct ieee80211_rate *rate = NULL;
2628                 struct ieee80211_supported_band *sband;
2629                 struct ieee80211_rx_status *status;
2630
2631                 status = IEEE80211_SKB_RXCB((rx->skb));
2632
2633                 sband = rx->local->hw.wiphy->bands[status->band];
2634                 if (!(status->flag & RX_FLAG_HT))
2635                         rate = &sband->bitrates[status->rate_idx];
2636
2637                 ieee80211_rx_cooked_monitor(rx, rate);
2638                 break;
2639                 }
2640         case RX_DROP_UNUSABLE:
2641                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2642                 if (rx->sta)
2643                         rx->sta->rx_dropped++;
2644                 dev_kfree_skb(rx->skb);
2645                 break;
2646         case RX_QUEUED:
2647                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2648                 break;
2649         }
2650 }
2651
2652 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2653 {
2654         ieee80211_rx_result res = RX_DROP_MONITOR;
2655         struct sk_buff *skb;
2656
2657 #define CALL_RXH(rxh)                   \
2658         do {                            \
2659                 res = rxh(rx);          \
2660                 if (res != RX_CONTINUE) \
2661                         goto rxh_next;  \
2662         } while (0);
2663
2664         spin_lock(&rx->local->rx_skb_queue.lock);
2665         if (rx->local->running_rx_handler)
2666                 goto unlock;
2667
2668         rx->local->running_rx_handler = true;
2669
2670         while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2671                 spin_unlock(&rx->local->rx_skb_queue.lock);
2672
2673                 /*
2674                  * all the other fields are valid across frames
2675                  * that belong to an aMPDU since they are on the
2676                  * same TID from the same station
2677                  */
2678                 rx->skb = skb;
2679
2680                 CALL_RXH(ieee80211_rx_h_decrypt)
2681                 CALL_RXH(ieee80211_rx_h_check_more_data)
2682                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2683                 CALL_RXH(ieee80211_rx_h_sta_process)
2684                 CALL_RXH(ieee80211_rx_h_defragment)
2685                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2686                 /* must be after MMIC verify so header is counted in MPDU mic */
2687 #ifdef CONFIG_MAC80211_MESH
2688                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2689                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2690 #endif
2691                 CALL_RXH(ieee80211_rx_h_amsdu)
2692                 CALL_RXH(ieee80211_rx_h_data)
2693                 CALL_RXH(ieee80211_rx_h_ctrl);
2694                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2695                 CALL_RXH(ieee80211_rx_h_action)
2696                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2697                 CALL_RXH(ieee80211_rx_h_action_return)
2698                 CALL_RXH(ieee80211_rx_h_mgmt)
2699
2700  rxh_next:
2701                 ieee80211_rx_handlers_result(rx, res);
2702                 spin_lock(&rx->local->rx_skb_queue.lock);
2703 #undef CALL_RXH
2704         }
2705
2706         rx->local->running_rx_handler = false;
2707
2708  unlock:
2709         spin_unlock(&rx->local->rx_skb_queue.lock);
2710 }
2711
2712 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2713 {
2714         ieee80211_rx_result res = RX_DROP_MONITOR;
2715
2716 #define CALL_RXH(rxh)                   \
2717         do {                            \
2718                 res = rxh(rx);          \
2719                 if (res != RX_CONTINUE) \
2720                         goto rxh_next;  \
2721         } while (0);
2722
2723         CALL_RXH(ieee80211_rx_h_passive_scan)
2724         CALL_RXH(ieee80211_rx_h_check)
2725
2726         ieee80211_rx_reorder_ampdu(rx);
2727
2728         ieee80211_rx_handlers(rx);
2729         return;
2730
2731  rxh_next:
2732         ieee80211_rx_handlers_result(rx, res);
2733
2734 #undef CALL_RXH
2735 }
2736
2737 /*
2738  * This function makes calls into the RX path, therefore
2739  * it has to be invoked under RCU read lock.
2740  */
2741 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2742 {
2743         struct ieee80211_rx_data rx = {
2744                 .sta = sta,
2745                 .sdata = sta->sdata,
2746                 .local = sta->local,
2747                 /* This is OK -- must be QoS data frame */
2748                 .security_idx = tid,
2749                 .seqno_idx = tid,
2750                 .flags = 0,
2751         };
2752         struct tid_ampdu_rx *tid_agg_rx;
2753
2754         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2755         if (!tid_agg_rx)
2756                 return;
2757
2758         spin_lock(&tid_agg_rx->reorder_lock);
2759         ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2760         spin_unlock(&tid_agg_rx->reorder_lock);
2761
2762         ieee80211_rx_handlers(&rx);
2763 }
2764
2765 /* main receive path */
2766
2767 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2768                                 struct ieee80211_hdr *hdr)
2769 {
2770         struct ieee80211_sub_if_data *sdata = rx->sdata;
2771         struct sk_buff *skb = rx->skb;
2772         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2773         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2774         int multicast = is_multicast_ether_addr(hdr->addr1);
2775
2776         switch (sdata->vif.type) {
2777         case NL80211_IFTYPE_STATION:
2778                 if (!bssid && !sdata->u.mgd.use_4addr)
2779                         return 0;
2780                 if (!multicast &&
2781                     compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2782                         if (!(sdata->dev->flags & IFF_PROMISC) ||
2783                             sdata->u.mgd.use_4addr)
2784                                 return 0;
2785                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2786                 }
2787                 break;
2788         case NL80211_IFTYPE_ADHOC:
2789                 if (!bssid)
2790                         return 0;
2791                 if (ieee80211_is_beacon(hdr->frame_control)) {
2792                         return 1;
2793                 }
2794                 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2795                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2796                                 return 0;
2797                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2798                 } else if (!multicast &&
2799                            compare_ether_addr(sdata->vif.addr,
2800                                               hdr->addr1) != 0) {
2801                         if (!(sdata->dev->flags & IFF_PROMISC))
2802                                 return 0;
2803                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2804                 } else if (!rx->sta) {
2805                         int rate_idx;
2806                         if (status->flag & RX_FLAG_HT)
2807                                 rate_idx = 0; /* TODO: HT rates */
2808                         else
2809                                 rate_idx = status->rate_idx;
2810                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2811                                                  BIT(rate_idx));
2812                 }
2813                 break;
2814         case NL80211_IFTYPE_MESH_POINT:
2815                 if (!multicast &&
2816                     compare_ether_addr(sdata->vif.addr,
2817                                        hdr->addr1) != 0) {
2818                         if (!(sdata->dev->flags & IFF_PROMISC))
2819                                 return 0;
2820
2821                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2822                 }
2823                 break;
2824         case NL80211_IFTYPE_AP_VLAN:
2825         case NL80211_IFTYPE_AP:
2826                 if (!bssid) {
2827                         if (compare_ether_addr(sdata->vif.addr,
2828                                                hdr->addr1))
2829                                 return 0;
2830                 } else if (!ieee80211_bssid_match(bssid,
2831                                         sdata->vif.addr)) {
2832                         /*
2833                          * Accept public action frames even when the
2834                          * BSSID doesn't match, this is used for P2P
2835                          * and location updates. Note that mac80211
2836                          * itself never looks at these frames.
2837                          */
2838                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2839                             ieee80211_is_public_action(hdr, skb->len))
2840                                 return 1;
2841                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2842                             !ieee80211_is_beacon(hdr->frame_control))
2843                                 return 0;
2844                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2845                 }
2846                 break;
2847         case NL80211_IFTYPE_WDS:
2848                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2849                         return 0;
2850                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2851                         return 0;
2852                 break;
2853         default:
2854                 /* should never get here */
2855                 WARN_ON(1);
2856                 break;
2857         }
2858
2859         return 1;
2860 }
2861
2862 /*
2863  * This function returns whether or not the SKB
2864  * was destined for RX processing or not, which,
2865  * if consume is true, is equivalent to whether
2866  * or not the skb was consumed.
2867  */
2868 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2869                                             struct sk_buff *skb, bool consume)
2870 {
2871         struct ieee80211_local *local = rx->local;
2872         struct ieee80211_sub_if_data *sdata = rx->sdata;
2873         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2874         struct ieee80211_hdr *hdr = (void *)skb->data;
2875         int prepares;
2876
2877         rx->skb = skb;
2878         status->rx_flags |= IEEE80211_RX_RA_MATCH;
2879         prepares = prepare_for_handlers(rx, hdr);
2880
2881         if (!prepares)
2882                 return false;
2883
2884         if (!consume) {
2885                 skb = skb_copy(skb, GFP_ATOMIC);
2886                 if (!skb) {
2887                         if (net_ratelimit())
2888                                 wiphy_debug(local->hw.wiphy,
2889                                         "failed to copy skb for %s\n",
2890                                         sdata->name);
2891                         return true;
2892                 }
2893
2894                 rx->skb = skb;
2895         }
2896
2897         ieee80211_invoke_rx_handlers(rx);
2898         return true;
2899 }
2900
2901 /*
2902  * This is the actual Rx frames handler. as it blongs to Rx path it must
2903  * be called with rcu_read_lock protection.
2904  */
2905 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2906                                          struct sk_buff *skb)
2907 {
2908         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2909         struct ieee80211_local *local = hw_to_local(hw);
2910         struct ieee80211_sub_if_data *sdata;
2911         struct ieee80211_hdr *hdr;
2912         __le16 fc;
2913         struct ieee80211_rx_data rx;
2914         struct ieee80211_sub_if_data *prev;
2915         struct sta_info *sta, *tmp, *prev_sta;
2916         int err = 0;
2917
2918         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2919         memset(&rx, 0, sizeof(rx));
2920         rx.skb = skb;
2921         rx.local = local;
2922
2923         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2924                 local->dot11ReceivedFragmentCount++;
2925
2926         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2927                      test_bit(SCAN_SW_SCANNING, &local->scanning)))
2928                 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2929
2930         if (ieee80211_is_mgmt(fc))
2931                 err = skb_linearize(skb);
2932         else
2933                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2934
2935         if (err) {
2936                 dev_kfree_skb(skb);
2937                 return;
2938         }
2939
2940         hdr = (struct ieee80211_hdr *)skb->data;
2941         ieee80211_parse_qos(&rx);
2942         ieee80211_verify_alignment(&rx);
2943
2944         if (ieee80211_is_data(fc)) {
2945                 prev_sta = NULL;
2946
2947                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2948                         if (!prev_sta) {
2949                                 prev_sta = sta;
2950                                 continue;
2951                         }
2952
2953                         rx.sta = prev_sta;
2954                         rx.sdata = prev_sta->sdata;
2955                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
2956
2957                         prev_sta = sta;
2958                 }
2959
2960                 if (prev_sta) {
2961                         rx.sta = prev_sta;
2962                         rx.sdata = prev_sta->sdata;
2963
2964                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2965                                 return;
2966                         goto out;
2967                 }
2968         }
2969
2970         prev = NULL;
2971
2972         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2973                 if (!ieee80211_sdata_running(sdata))
2974                         continue;
2975
2976                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2977                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2978                         continue;
2979
2980                 /*
2981                  * frame is destined for this interface, but if it's
2982                  * not also for the previous one we handle that after
2983                  * the loop to avoid copying the SKB once too much
2984                  */
2985
2986                 if (!prev) {
2987                         prev = sdata;
2988                         continue;
2989                 }
2990
2991                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2992                 rx.sdata = prev;
2993                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2994
2995                 prev = sdata;
2996         }
2997
2998         if (prev) {
2999                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3000                 rx.sdata = prev;
3001
3002                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3003                         return;
3004         }
3005
3006  out:
3007         dev_kfree_skb(skb);
3008 }
3009
3010 /*
3011  * This is the receive path handler. It is called by a low level driver when an
3012  * 802.11 MPDU is received from the hardware.
3013  */
3014 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3015 {
3016         struct ieee80211_local *local = hw_to_local(hw);
3017         struct ieee80211_rate *rate = NULL;
3018         struct ieee80211_supported_band *sband;
3019         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3020
3021         WARN_ON_ONCE(softirq_count() == 0);
3022
3023         if (WARN_ON(status->band < 0 ||
3024                     status->band >= IEEE80211_NUM_BANDS))
3025                 goto drop;
3026
3027         sband = local->hw.wiphy->bands[status->band];
3028         if (WARN_ON(!sband))
3029                 goto drop;
3030
3031         /*
3032          * If we're suspending, it is possible although not too likely
3033          * that we'd be receiving frames after having already partially
3034          * quiesced the stack. We can't process such frames then since
3035          * that might, for example, cause stations to be added or other
3036          * driver callbacks be invoked.
3037          */
3038         if (unlikely(local->quiescing || local->suspended))
3039                 goto drop;
3040
3041         /*
3042          * The same happens when we're not even started,
3043          * but that's worth a warning.
3044          */
3045         if (WARN_ON(!local->started))
3046                 goto drop;
3047
3048         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3049                 /*
3050                  * Validate the rate, unless a PLCP error means that
3051                  * we probably can't have a valid rate here anyway.
3052                  */
3053
3054                 if (status->flag & RX_FLAG_HT) {
3055                         /*
3056                          * rate_idx is MCS index, which can be [0-76]
3057                          * as documented on:
3058                          *
3059                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3060                          *
3061                          * Anything else would be some sort of driver or
3062                          * hardware error. The driver should catch hardware
3063                          * errors.
3064                          */
3065                         if (WARN((status->rate_idx < 0 ||
3066                                  status->rate_idx > 76),
3067                                  "Rate marked as an HT rate but passed "
3068                                  "status->rate_idx is not "
3069                                  "an MCS index [0-76]: %d (0x%02x)\n",
3070                                  status->rate_idx,
3071                                  status->rate_idx))
3072                                 goto drop;
3073                 } else {
3074                         if (WARN_ON(status->rate_idx < 0 ||
3075                                     status->rate_idx >= sband->n_bitrates))
3076                                 goto drop;
3077                         rate = &sband->bitrates[status->rate_idx];
3078                 }
3079         }
3080
3081         status->rx_flags = 0;
3082
3083         /*
3084          * key references and virtual interfaces are protected using RCU
3085          * and this requires that we are in a read-side RCU section during
3086          * receive processing
3087          */
3088         rcu_read_lock();
3089
3090         /*
3091          * Frames with failed FCS/PLCP checksum are not returned,
3092          * all other frames are returned without radiotap header
3093          * if it was previously present.
3094          * Also, frames with less than 16 bytes are dropped.
3095          */
3096         skb = ieee80211_rx_monitor(local, skb, rate);
3097         if (!skb) {
3098                 rcu_read_unlock();
3099                 return;
3100         }
3101
3102         ieee80211_tpt_led_trig_rx(local,
3103                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3104                         skb->len);
3105         __ieee80211_rx_handle_packet(hw, skb);
3106
3107         rcu_read_unlock();
3108
3109         return;
3110  drop:
3111         kfree_skb(skb);
3112 }
3113 EXPORT_SYMBOL(ieee80211_rx);
3114
3115 /* This is a version of the rx handler that can be called from hard irq
3116  * context. Post the skb on the queue and schedule the tasklet */
3117 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3118 {
3119         struct ieee80211_local *local = hw_to_local(hw);
3120
3121         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3122
3123         skb->pkt_type = IEEE80211_RX_MSG;
3124         skb_queue_tail(&local->skb_queue, skb);
3125         tasklet_schedule(&local->tasklet);
3126 }
3127 EXPORT_SYMBOL(ieee80211_rx_irqsafe);