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         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  44
  45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  46                 if (likely(skb->len > FCS_LEN))
  47                         __pskb_trim(skb, skb->len - FCS_LEN);
  48                 else {
  49                         /* driver bug */
  50                         WARN_ON(1);
  51                         dev_kfree_skb(skb);
  52                         return NULL;
  53                 }
  54         }
  55
  56         if (status->vendor_radiotap_len)
  57                 __pskb_pull(skb, status->vendor_radiotap_len);
  58
  59         return skb;
  60 }
  61
  62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  63 {
  64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  65         struct ieee80211_hdr *hdr;
  66
  67         hdr = (void *)(skb->data + status->vendor_radiotap_len);
  68
  69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  70                             RX_FLAG_FAILED_PLCP_CRC |
  71                             RX_FLAG_AMPDU_IS_ZEROLEN))
  72                 return 1;
  73         if (unlikely(skb->len < 16 + present_fcs_len +
  74                                 status->vendor_radiotap_len))
  75                 return 1;
  76         if (ieee80211_is_ctl(hdr->frame_control) &&
  77             !ieee80211_is_pspoll(hdr->frame_control) &&
  78             !ieee80211_is_back_req(hdr->frame_control))
  79                 return 1;
  80         return 0;
  81 }
  82
  83 static int
  84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  85                             struct ieee80211_rx_status *status)
  86 {
  87         int len;
  88
  89         /* always present fields */
  90         len = sizeof(struct ieee80211_radiotap_header) + 8;
  91
  92         /* allocate extra bitmaps */
  93         if (status->vendor_radiotap_len)
  94                 len += 4;
  95         if (status->chains)
  96                 len += 4 * hweight8(status->chains);
  97
  98         if (ieee80211_have_rx_timestamp(status)) {
  99                 len = ALIGN(len, 8);
 100                 len += 8;
 101         }
 102         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 103                 len += 1;
 104
 105         /* antenna field, if we don't have per-chain info */
 106         if (!status->chains)
 107                 len += 1;
 108
 109         /* padding for RX_FLAGS if necessary */
 110         len = ALIGN(len, 2);
 111
 112         if (status->flag & RX_FLAG_HT) /* HT info */
 113                 len += 3;
 114
 115         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 116                 len = ALIGN(len, 4);
 117                 len += 8;
 118         }
 119
 120         if (status->flag & RX_FLAG_VHT) {
 121                 len = ALIGN(len, 2);
 122                 len += 12;
 123         }
 124
 125         if (status->chains) {
 126                 /* antenna and antenna signal fields */
 127                 len += 2 * hweight8(status->chains);
 128         }
 129
 130         if (status->vendor_radiotap_len) {
 131                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
 132                         status->vendor_radiotap_align = 1;
 133                 /* align standard part of vendor namespace */
 134                 len = ALIGN(len, 2);
 135                 /* allocate standard part of vendor namespace */
 136                 len += 6;
 137                 /* align vendor-defined part */
 138                 len = ALIGN(len, status->vendor_radiotap_align);
 139                 /* vendor-defined part is already in skb */
 140         }
 141
 142         return len;
 143 }
 144
 145 /*
 146  * ieee80211_add_rx_radiotap_header - add radiotap header
 147  *
 148  * add a radiotap header containing all the fields which the hardware provided.
 149  */
 150 static void
 151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 152                                  struct sk_buff *skb,
 153                                  struct ieee80211_rate *rate,
 154                                  int rtap_len, bool has_fcs)
 155 {
 156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 157         struct ieee80211_radiotap_header *rthdr;
 158         unsigned char *pos;
 159         __le32 *it_present;
 160         u32 it_present_val;
 161         u16 rx_flags = 0;
 162         u16 channel_flags = 0;
 163         int mpdulen, chain;
 164         unsigned long chains = status->chains;
 165
 166         mpdulen = skb->len;
 167         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 168                 mpdulen += FCS_LEN;
 169
 170         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 171         memset(rthdr, 0, rtap_len);
 172         it_present = &rthdr->it_present;
 173
 174         /* radiotap header, set always present flags */
 175         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
 176         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 177                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 178                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 179
 180         if (!status->chains)
 181                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 182
 183         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 184                 it_present_val |=
 185                         BIT(IEEE80211_RADIOTAP_EXT) |
 186                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 187                 put_unaligned_le32(it_present_val, it_present);
 188                 it_present++;
 189                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 190                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 191         }
 192
 193         if (status->vendor_radiotap_len) {
 194                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 195                                   BIT(IEEE80211_RADIOTAP_EXT);
 196                 put_unaligned_le32(it_present_val, it_present);
 197                 it_present++;
 198                 it_present_val = status->vendor_radiotap_bitmap;
 199         }
 200
 201         put_unaligned_le32(it_present_val, it_present);
 202
 203         pos = (void *)(it_present + 1);
 204
 205         /* the order of the following fields is important */
 206
 207         /* IEEE80211_RADIOTAP_TSFT */
 208         if (ieee80211_have_rx_timestamp(status)) {
 209                 /* padding */
 210                 while ((pos - (u8 *)rthdr) & 7)
 211                         *pos++ = 0;
 212                 put_unaligned_le64(
 213                         ieee80211_calculate_rx_timestamp(local, status,
 214                                                          mpdulen, 0),
 215                         pos);
 216                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 217                 pos += 8;
 218         }
 219
 220         /* IEEE80211_RADIOTAP_FLAGS */
 221         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 222                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 223         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 224                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 225         if (status->flag & RX_FLAG_SHORTPRE)
 226                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 227         pos++;
 228
 229         /* IEEE80211_RADIOTAP_RATE */
 230         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 231                 /*
 232                  * Without rate information don't add it. If we have,
 233                  * MCS information is a separate field in radiotap,
 234                  * added below. The byte here is needed as padding
 235                  * for the channel though, so initialise it to 0.
 236                  */
 237                 *pos = 0;
 238         } else {
 239                 int shift = 0;
 240                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 241                 if (status->flag & RX_FLAG_10MHZ)
 242                         shift = 1;
 243                 else if (status->flag & RX_FLAG_5MHZ)
 244                         shift = 2;
 245                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 246         }
 247         pos++;
 248
 249         /* IEEE80211_RADIOTAP_CHANNEL */
 250         put_unaligned_le16(status->freq, pos);
 251         pos += 2;
 252         if (status->flag & RX_FLAG_10MHZ)
 253                 channel_flags |= IEEE80211_CHAN_HALF;
 254         else if (status->flag & RX_FLAG_5MHZ)
 255                 channel_flags |= IEEE80211_CHAN_QUARTER;
 256
 257         if (status->band == IEEE80211_BAND_5GHZ)
 258                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 259         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 260                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 261         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 262                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 263         else if (rate)
 264                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 265         else
 266                 channel_flags |= IEEE80211_CHAN_2GHZ;
 267         put_unaligned_le16(channel_flags, pos);
 268         pos += 2;
 269
 270         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 271         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 272             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 273                 *pos = status->signal;
 274                 rthdr->it_present |=
 275                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 276                 pos++;
 277         }
 278
 279         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 280
 281         if (!status->chains) {
 282                 /* IEEE80211_RADIOTAP_ANTENNA */
 283                 *pos = status->antenna;
 284                 pos++;
 285         }
 286
 287         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 288
 289         /* IEEE80211_RADIOTAP_RX_FLAGS */
 290         /* ensure 2 byte alignment for the 2 byte field as required */
 291         if ((pos - (u8 *)rthdr) & 1)
 292                 *pos++ = 0;
 293         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 294                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 295         put_unaligned_le16(rx_flags, pos);
 296         pos += 2;
 297
 298         if (status->flag & RX_FLAG_HT) {
 299                 unsigned int stbc;
 300
 301                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 302                 *pos++ = local->hw.radiotap_mcs_details;
 303                 *pos = 0;
 304                 if (status->flag & RX_FLAG_SHORT_GI)
 305                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 306                 if (status->flag & RX_FLAG_40MHZ)
 307                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 308                 if (status->flag & RX_FLAG_HT_GF)
 309                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 310                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 311                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 312                 pos++;
 313                 *pos++ = status->rate_idx;
 314         }
 315
 316         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 317                 u16 flags = 0;
 318
 319                 /* ensure 4 byte alignment */
 320                 while ((pos - (u8 *)rthdr) & 3)
 321                         pos++;
 322                 rthdr->it_present |=
 323                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 324                 put_unaligned_le32(status->ampdu_reference, pos);
 325                 pos += 4;
 326                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 327                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 328                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 329                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 330                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 331                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 332                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 333                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 334                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 335                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 336                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 337                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 338                 put_unaligned_le16(flags, pos);
 339                 pos += 2;
 340                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 341                         *pos++ = status->ampdu_delimiter_crc;
 342                 else
 343                         *pos++ = 0;
 344                 *pos++ = 0;
 345         }
 346
 347         if (status->flag & RX_FLAG_VHT) {
 348                 u16 known = local->hw.radiotap_vht_details;
 349
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 351                 /* known field - how to handle 80+80? */
 352                 if (status->flag & RX_FLAG_80P80MHZ)
 353                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 354                 put_unaligned_le16(known, pos);
 355                 pos += 2;
 356                 /* flags */
 357                 if (status->flag & RX_FLAG_SHORT_GI)
 358                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 359                 pos++;
 360                 /* bandwidth */
 361                 if (status->flag & RX_FLAG_80MHZ)
 362                         *pos++ = 4;
 363                 else if (status->flag & RX_FLAG_80P80MHZ)
 364                         *pos++ = 0; /* marked not known above */
 365                 else if (status->flag & RX_FLAG_160MHZ)
 366                         *pos++ = 11;
 367                 else if (status->flag & RX_FLAG_40MHZ)
 368                         *pos++ = 1;
 369                 else /* 20 MHz */
 370                         *pos++ = 0;
 371                 /* MCS/NSS */
 372                 *pos = (status->rate_idx << 4) | status->vht_nss;
 373                 pos += 4;
 374                 /* coding field */
 375                 pos++;
 376                 /* group ID */
 377                 pos++;
 378                 /* partial_aid */
 379                 pos += 2;
 380         }
 381
 382         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 383                 *pos++ = status->chain_signal[chain];
 384                 *pos++ = chain;
 385         }
 386
 387         if (status->vendor_radiotap_len) {
 388                 /* ensure 2 byte alignment for the vendor field as required */
 389                 if ((pos - (u8 *)rthdr) & 1)
 390                         *pos++ = 0;
 391                 *pos++ = status->vendor_radiotap_oui[0];
 392                 *pos++ = status->vendor_radiotap_oui[1];
 393                 *pos++ = status->vendor_radiotap_oui[2];
 394                 *pos++ = status->vendor_radiotap_subns;
 395                 put_unaligned_le16(status->vendor_radiotap_len, pos);
 396                 pos += 2;
 397                 /* align the actual payload as requested */
 398                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
 399                         *pos++ = 0;
 400         }
 401 }
 402
 403 /*
 404  * This function copies a received frame to all monitor interfaces and
 405  * returns a cleaned-up SKB that no longer includes the FCS nor the
 406  * radiotap header the driver might have added.
 407  */
 408 static struct sk_buff *
 409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 410                      struct ieee80211_rate *rate)
 411 {
 412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 413         struct ieee80211_sub_if_data *sdata;
 414         int needed_headroom;
 415         struct sk_buff *skb, *skb2;
 416         struct net_device *prev_dev = NULL;
 417         int present_fcs_len = 0;
 418
 419         /*
 420          * First, we may need to make a copy of the skb because
 421          *  (1) we need to modify it for radiotap (if not present), and
 422          *  (2) the other RX handlers will modify the skb we got.
 423          *
 424          * We don't need to, of course, if we aren't going to return
 425          * the SKB because it has a bad FCS/PLCP checksum.
 426          */
 427
 428         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 429                 present_fcs_len = FCS_LEN;
 430
 431         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 432         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
 433                 dev_kfree_skb(origskb);
 434                 return NULL;
 435         }
 436
 437         if (!local->monitors) {
 438                 if (should_drop_frame(origskb, present_fcs_len)) {
 439                         dev_kfree_skb(origskb);
 440                         return NULL;
 441                 }
 442
 443                 return remove_monitor_info(local, origskb);
 444         }
 445
 446         /* room for the radiotap header based on driver features */
 447         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 448
 449         if (should_drop_frame(origskb, present_fcs_len)) {
 450                 /* only need to expand headroom if necessary */
 451                 skb = origskb;
 452                 origskb = NULL;
 453
 454                 /*
 455                  * This shouldn't trigger often because most devices have an
 456                  * RX header they pull before we get here, and that should
 457                  * be big enough for our radiotap information. We should
 458                  * probably export the length to drivers so that we can have
 459                  * them allocate enough headroom to start with.
 460                  */
 461                 if (skb_headroom(skb) < needed_headroom &&
 462                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 463                         dev_kfree_skb(skb);
 464                         return NULL;
 465                 }
 466         } else {
 467                 /*
 468                  * Need to make a copy and possibly remove radiotap header
 469                  * and FCS from the original.
 470                  */
 471                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 472
 473                 origskb = remove_monitor_info(local, origskb);
 474
 475                 if (!skb)
 476                         return origskb;
 477         }
 478
 479         /* prepend radiotap information */
 480         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 481                                          true);
 482
 483         skb_reset_mac_header(skb);
 484         skb->ip_summed = CHECKSUM_UNNECESSARY;
 485         skb->pkt_type = PACKET_OTHERHOST;
 486         skb->protocol = htons(ETH_P_802_2);
 487
 488         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 489                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 490                         continue;
 491
 492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 493                         continue;
 494
 495                 if (!ieee80211_sdata_running(sdata))
 496                         continue;
 497
 498                 if (prev_dev) {
 499                         skb2 = skb_clone(skb, GFP_ATOMIC);
 500                         if (skb2) {
 501                                 skb2->dev = prev_dev;
 502                                 netif_receive_skb(skb2);
 503                         }
 504                 }
 505
 506                 prev_dev = sdata->dev;
 507                 sdata->dev->stats.rx_packets++;
 508                 sdata->dev->stats.rx_bytes += skb->len;
 509         }
 510
 511         if (prev_dev) {
 512                 skb->dev = prev_dev;
 513                 netif_receive_skb(skb);
 514         } else
 515                 dev_kfree_skb(skb);
 516
 517         return origskb;
 518 }
 519
 520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 521 {
 522         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 524         int tid, seqno_idx, security_idx;
 525
 526         /* does the frame have a qos control field? */
 527         if (ieee80211_is_data_qos(hdr->frame_control)) {
 528                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 529                 /* frame has qos control */
 530                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 531                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 532                         status->rx_flags |= IEEE80211_RX_AMSDU;
 533
 534                 seqno_idx = tid;
 535                 security_idx = tid;
 536         } else {
 537                 /*
 538                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 539                  *
 540                  *      Sequence numbers for management frames, QoS data
 541                  *      frames with a broadcast/multicast address in the
 542                  *      Address 1 field, and all non-QoS data frames sent
 543                  *      by QoS STAs are assigned using an additional single
 544                  *      modulo-4096 counter, [...]
 545                  *
 546                  * We also use that counter for non-QoS STAs.
 547                  */
 548                 seqno_idx = IEEE80211_NUM_TIDS;
 549                 security_idx = 0;
 550                 if (ieee80211_is_mgmt(hdr->frame_control))
 551                         security_idx = IEEE80211_NUM_TIDS;
 552                 tid = 0;
 553         }
 554
 555         rx->seqno_idx = seqno_idx;
 556         rx->security_idx = security_idx;
 557         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 558          * For now, set skb->priority to 0 for other cases. */
 559         rx->skb->priority = (tid > 7) ? 0 : tid;
 560 }
 561
 562 /**
 563  * DOC: Packet alignment
 564  *
 565  * Drivers always need to pass packets that are aligned to two-byte boundaries
 566  * to the stack.
 567  *
 568  * Additionally, should, if possible, align the payload data in a way that
 569  * guarantees that the contained IP header is aligned to a four-byte
 570  * boundary. In the case of regular frames, this simply means aligning the
 571  * payload to a four-byte boundary (because either the IP header is directly
 572  * contained, or IV/RFC1042 headers that have a length divisible by four are
 573  * in front of it).  If the payload data is not properly aligned and the
 574  * architecture doesn't support efficient unaligned operations, mac80211
 575  * will align the data.
 576  *
 577  * With A-MSDU frames, however, the payload data address must yield two modulo
 578  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 579  * push the IP header further back to a multiple of four again. Thankfully, the
 580  * specs were sane enough this time around to require padding each A-MSDU
 581  * subframe to a length that is a multiple of four.
 582  *
 583  * Padding like Atheros hardware adds which is between the 802.11 header and
 584  * the payload is not supported, the driver is required to move the 802.11
 585  * header to be directly in front of the payload in that case.
 586  */
 587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 588 {
 589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 590         WARN_ONCE((unsigned long)rx->skb->data & 1,
 591                   "unaligned packet at 0x%p\n", rx->skb->data);
 592 #endif
 593 }
 594
 595
 596 /* rx handlers */
 597
 598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 599 {
 600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 601
 602         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
 603                 return 0;
 604
 605         return ieee80211_is_robust_mgmt_frame(hdr);
 606 }
 607
 608
 609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 610 {
 611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 612
 613         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
 614                 return 0;
 615
 616         return ieee80211_is_robust_mgmt_frame(hdr);
 617 }
 618
 619
 620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 622 {
 623         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 624         struct ieee80211_mmie *mmie;
 625
 626         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 627                 return -1;
 628
 629         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
 630                 return -1; /* not a robust management frame */
 631
 632         mmie = (struct ieee80211_mmie *)
 633                 (skb->data + skb->len - sizeof(*mmie));
 634         if (mmie->element_id != WLAN_EID_MMIE ||
 635             mmie->length != sizeof(*mmie) - 2)
 636                 return -1;
 637
 638         return le16_to_cpu(mmie->key_id);
 639 }
 640
 641 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 642 {
 643         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 644         char *dev_addr = rx->sdata->vif.addr;
 645
 646         if (ieee80211_is_data(hdr->frame_control)) {
 647                 if (is_multicast_ether_addr(hdr->addr1)) {
 648                         if (ieee80211_has_tods(hdr->frame_control) ||
 649                             !ieee80211_has_fromds(hdr->frame_control))
 650                                 return RX_DROP_MONITOR;
 651                         if (ether_addr_equal(hdr->addr3, dev_addr))
 652                                 return RX_DROP_MONITOR;
 653                 } else {
 654                         if (!ieee80211_has_a4(hdr->frame_control))
 655                                 return RX_DROP_MONITOR;
 656                         if (ether_addr_equal(hdr->addr4, dev_addr))
 657                                 return RX_DROP_MONITOR;
 658                 }
 659         }
 660
 661         /* If there is not an established peer link and this is not a peer link
 662          * establisment frame, beacon or probe, drop the frame.
 663          */
 664
 665         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 666                 struct ieee80211_mgmt *mgmt;
 667
 668                 if (!ieee80211_is_mgmt(hdr->frame_control))
 669                         return RX_DROP_MONITOR;
 670
 671                 if (ieee80211_is_action(hdr->frame_control)) {
 672                         u8 category;
 673
 674                         /* make sure category field is present */
 675                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 676                                 return RX_DROP_MONITOR;
 677
 678                         mgmt = (struct ieee80211_mgmt *)hdr;
 679                         category = mgmt->u.action.category;
 680                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 681                             category != WLAN_CATEGORY_SELF_PROTECTED)
 682                                 return RX_DROP_MONITOR;
 683                         return RX_CONTINUE;
 684                 }
 685
 686                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 687                     ieee80211_is_probe_resp(hdr->frame_control) ||
 688                     ieee80211_is_beacon(hdr->frame_control) ||
 689                     ieee80211_is_auth(hdr->frame_control))
 690                         return RX_CONTINUE;
 691
 692                 return RX_DROP_MONITOR;
 693         }
 694
 695         return RX_CONTINUE;
 696 }
 697
 698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 699                                             struct tid_ampdu_rx *tid_agg_rx,
 700                                             int index,
 701                                             struct sk_buff_head *frames)
 702 {
 703         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 704         struct ieee80211_rx_status *status;
 705
 706         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 707
 708         if (!skb)
 709                 goto no_frame;
 710
 711         /* release the frame from the reorder ring buffer */
 712         tid_agg_rx->stored_mpdu_num--;
 713         tid_agg_rx->reorder_buf[index] = NULL;
 714         status = IEEE80211_SKB_RXCB(skb);
 715         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 716         __skb_queue_tail(frames, skb);
 717
 718 no_frame:
 719         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 720 }
 721
 722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 723                                              struct tid_ampdu_rx *tid_agg_rx,
 724                                              u16 head_seq_num,
 725                                              struct sk_buff_head *frames)
 726 {
 727         int index;
 728
 729         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 730
 731         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 732                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 733                                          tid_agg_rx->ssn) %
 734                                                         tid_agg_rx->buf_size;
 735                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 736                                                 frames);
 737         }
 738 }
 739
 740 /*
 741  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 742  * the skb was added to the buffer longer than this time ago, the earlier
 743  * frames that have not yet been received are assumed to be lost and the skb
 744  * can be released for processing. This may also release other skb's from the
 745  * reorder buffer if there are no additional gaps between the frames.
 746  *
 747  * Callers must hold tid_agg_rx->reorder_lock.
 748  */
 749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 750
 751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 752                                           struct tid_ampdu_rx *tid_agg_rx,
 753                                           struct sk_buff_head *frames)
 754 {
 755         int index, j;
 756
 757         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 758
 759         /* release the buffer until next missing frame */
 760         index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 761                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 762         if (!tid_agg_rx->reorder_buf[index] &&
 763             tid_agg_rx->stored_mpdu_num) {
 764                 /*
 765                  * No buffers ready to be released, but check whether any
 766                  * frames in the reorder buffer have timed out.
 767                  */
 768                 int skipped = 1;
 769                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 770                      j = (j + 1) % tid_agg_rx->buf_size) {
 771                         if (!tid_agg_rx->reorder_buf[j]) {
 772                                 skipped++;
 773                                 continue;
 774                         }
 775                         if (skipped &&
 776                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 777                                         HT_RX_REORDER_BUF_TIMEOUT))
 778                                 goto set_release_timer;
 779
 780                         ht_dbg_ratelimited(sdata,
 781                                            "release an RX reorder frame due to timeout on earlier frames\n");
 782                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 783                                                         frames);
 784
 785                         /*
 786                          * Increment the head seq# also for the skipped slots.
 787                          */
 788                         tid_agg_rx->head_seq_num =
 789                                 (tid_agg_rx->head_seq_num +
 790                                  skipped) & IEEE80211_SN_MASK;
 791                         skipped = 0;
 792                 }
 793         } else while (tid_agg_rx->reorder_buf[index]) {
 794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 795                                                 frames);
 796                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 797                                          tid_agg_rx->ssn) %
 798                                                         tid_agg_rx->buf_size;
 799         }
 800
 801         if (tid_agg_rx->stored_mpdu_num) {
 802                 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
 803                                              tid_agg_rx->ssn) %
 804                                                         tid_agg_rx->buf_size;
 805
 806                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 807                      j = (j + 1) % tid_agg_rx->buf_size) {
 808                         if (tid_agg_rx->reorder_buf[j])
 809                                 break;
 810                 }
 811
 812  set_release_timer:
 813
 814                 mod_timer(&tid_agg_rx->reorder_timer,
 815                           tid_agg_rx->reorder_time[j] + 1 +
 816                           HT_RX_REORDER_BUF_TIMEOUT);
 817         } else {
 818                 del_timer(&tid_agg_rx->reorder_timer);
 819         }
 820 }
 821
 822 /*
 823  * As this function belongs to the RX path it must be under
 824  * rcu_read_lock protection. It returns false if the frame
 825  * can be processed immediately, true if it was consumed.
 826  */
 827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 828                                              struct tid_ampdu_rx *tid_agg_rx,
 829                                              struct sk_buff *skb,
 830                                              struct sk_buff_head *frames)
 831 {
 832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 833         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 834         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 835         u16 head_seq_num, buf_size;
 836         int index;
 837         bool ret = true;
 838
 839         spin_lock(&tid_agg_rx->reorder_lock);
 840
 841         buf_size = tid_agg_rx->buf_size;
 842         head_seq_num = tid_agg_rx->head_seq_num;
 843
 844         /* frame with out of date sequence number */
 845         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 846                 dev_kfree_skb(skb);
 847                 goto out;
 848         }
 849
 850         /*
 851          * If frame the sequence number exceeds our buffering window
 852          * size release some previous frames to make room for this one.
 853          */
 854         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 855                 head_seq_num = ieee80211_sn_inc(
 856                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 857                 /* release stored frames up to new head to stack */
 858                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 859                                                  head_seq_num, frames);
 860         }
 861
 862         /* Now the new frame is always in the range of the reordering buffer */
 863
 864         index = ieee80211_sn_sub(mpdu_seq_num,
 865                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
 866
 867         /* check if we already stored this frame */
 868         if (tid_agg_rx->reorder_buf[index]) {
 869                 dev_kfree_skb(skb);
 870                 goto out;
 871         }
 872
 873         /*
 874          * If the current MPDU is in the right order and nothing else
 875          * is stored we can process it directly, no need to buffer it.
 876          * If it is first but there's something stored, we may be able
 877          * to release frames after this one.
 878          */
 879         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 880             tid_agg_rx->stored_mpdu_num == 0) {
 881                 tid_agg_rx->head_seq_num =
 882                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 883                 ret = false;
 884                 goto out;
 885         }
 886
 887         /* put the frame in the reordering buffer */
 888         tid_agg_rx->reorder_buf[index] = skb;
 889         tid_agg_rx->reorder_time[index] = jiffies;
 890         tid_agg_rx->stored_mpdu_num++;
 891         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 892
 893  out:
 894         spin_unlock(&tid_agg_rx->reorder_lock);
 895         return ret;
 896 }
 897
 898 /*
 899  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 900  * true if the MPDU was buffered, false if it should be processed.
 901  */
 902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 903                                        struct sk_buff_head *frames)
 904 {
 905         struct sk_buff *skb = rx->skb;
 906         struct ieee80211_local *local = rx->local;
 907         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 908         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 909         struct sta_info *sta = rx->sta;
 910         struct tid_ampdu_rx *tid_agg_rx;
 911         u16 sc;
 912         u8 tid, ack_policy;
 913
 914         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 915             is_multicast_ether_addr(hdr->addr1))
 916                 goto dont_reorder;
 917
 918         /*
 919          * filter the QoS data rx stream according to
 920          * STA/TID and check if this STA/TID is on aggregation
 921          */
 922
 923         if (!sta)
 924                 goto dont_reorder;
 925
 926         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 927                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 928         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 929
 930         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 931         if (!tid_agg_rx)
 932                 goto dont_reorder;
 933
 934         /* qos null data frames are excluded */
 935         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 936                 goto dont_reorder;
 937
 938         /* not part of a BA session */
 939         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 940             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 941                 goto dont_reorder;
 942
 943         /* not actually part of this BA session */
 944         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 945                 goto dont_reorder;
 946
 947         /* new, potentially un-ordered, ampdu frame - process it */
 948
 949         /* reset session timer */
 950         if (tid_agg_rx->timeout)
 951                 tid_agg_rx->last_rx = jiffies;
 952
 953         /* if this mpdu is fragmented - terminate rx aggregation session */
 954         sc = le16_to_cpu(hdr->seq_ctrl);
 955         if (sc & IEEE80211_SCTL_FRAG) {
 956                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 957                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 958                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 959                 return;
 960         }
 961
 962         /*
 963          * No locking needed -- we will only ever process one
 964          * RX packet at a time, and thus own tid_agg_rx. All
 965          * other code manipulating it needs to (and does) make
 966          * sure that we cannot get to it any more before doing
 967          * anything with it.
 968          */
 969         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 970                                              frames))
 971                 return;
 972
 973  dont_reorder:
 974         __skb_queue_tail(frames, skb);
 975 }
 976
 977 static ieee80211_rx_result debug_noinline
 978 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 979 {
 980         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 981         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 982
 983         /*
 984          * Drop duplicate 802.11 retransmissions
 985          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 986          */
 987         if (rx->skb->len >= 24 && rx->sta &&
 988             !ieee80211_is_ctl(hdr->frame_control) &&
 989             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
 990             !is_multicast_ether_addr(hdr->addr1)) {
 991                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 992                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 993                              hdr->seq_ctrl)) {
 994                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 995                                 rx->local->dot11FrameDuplicateCount++;
 996                                 rx->sta->num_duplicates++;
 997                         }
 998                         return RX_DROP_UNUSABLE;
 999                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1000                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1001                 }
1002         }
1003
1004         if (unlikely(rx->skb->len < 16)) {
1005                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1006                 return RX_DROP_MONITOR;
1007         }
1008
1009         /* Drop disallowed frame classes based on STA auth/assoc state;
1010          * IEEE 802.11, Chap 5.5.
1011          *
1012          * mac80211 filters only based on association state, i.e. it drops
1013          * Class 3 frames from not associated stations. hostapd sends
1014          * deauth/disassoc frames when needed. In addition, hostapd is
1015          * responsible for filtering on both auth and assoc states.
1016          */
1017
1018         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1019                 return ieee80211_rx_mesh_check(rx);
1020
1021         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1022                       ieee80211_is_pspoll(hdr->frame_control)) &&
1023                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1024                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1025                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1026                 /*
1027                  * accept port control frames from the AP even when it's not
1028                  * yet marked ASSOC to prevent a race where we don't set the
1029                  * assoc bit quickly enough before it sends the first frame
1030                  */
1031                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1032                     ieee80211_is_data_present(hdr->frame_control)) {
1033                         unsigned int hdrlen;
1034                         __be16 ethertype;
1035
1036                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1037
1038                         if (rx->skb->len < hdrlen + 8)
1039                                 return RX_DROP_MONITOR;
1040
1041                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1042                         if (ethertype == rx->sdata->control_port_protocol)
1043                                 return RX_CONTINUE;
1044                 }
1045
1046                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1047                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1048                                                hdr->addr2,
1049                                                GFP_ATOMIC))
1050                         return RX_DROP_UNUSABLE;
1051
1052                 return RX_DROP_MONITOR;
1053         }
1054
1055         return RX_CONTINUE;
1056 }
1057
1058
1059 static ieee80211_rx_result debug_noinline
1060 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1061 {
1062         struct ieee80211_local *local;
1063         struct ieee80211_hdr *hdr;
1064         struct sk_buff *skb;
1065
1066         local = rx->local;
1067         skb = rx->skb;
1068         hdr = (struct ieee80211_hdr *) skb->data;
1069
1070         if (!local->pspolling)
1071                 return RX_CONTINUE;
1072
1073         if (!ieee80211_has_fromds(hdr->frame_control))
1074                 /* this is not from AP */
1075                 return RX_CONTINUE;
1076
1077         if (!ieee80211_is_data(hdr->frame_control))
1078                 return RX_CONTINUE;
1079
1080         if (!ieee80211_has_moredata(hdr->frame_control)) {
1081                 /* AP has no more frames buffered for us */
1082                 local->pspolling = false;
1083                 return RX_CONTINUE;
1084         }
1085
1086         /* more data bit is set, let's request a new frame from the AP */
1087         ieee80211_send_pspoll(local, rx->sdata);
1088
1089         return RX_CONTINUE;
1090 }
1091
1092 static void sta_ps_start(struct sta_info *sta)
1093 {
1094         struct ieee80211_sub_if_data *sdata = sta->sdata;
1095         struct ieee80211_local *local = sdata->local;
1096         struct ps_data *ps;
1097
1098         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1099             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1100                 ps = &sdata->bss->ps;
1101         else
1102                 return;
1103
1104         atomic_inc(&ps->num_sta_ps);
1105         set_sta_flag(sta, WLAN_STA_PS_STA);
1106         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1107                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1108         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1109                sta->sta.addr, sta->sta.aid);
1110 }
1111
1112 static void sta_ps_end(struct sta_info *sta)
1113 {
1114         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1115                sta->sta.addr, sta->sta.aid);
1116
1117         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1118                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1119                        sta->sta.addr, sta->sta.aid);
1120                 return;
1121         }
1122
1123         ieee80211_sta_ps_deliver_wakeup(sta);
1124 }
1125
1126 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1127 {
1128         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1129         bool in_ps;
1130
1131         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1132
1133         /* Don't let the same PS state be set twice */
1134         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1135         if ((start && in_ps) || (!start && !in_ps))
1136                 return -EINVAL;
1137
1138         if (start)
1139                 sta_ps_start(sta_inf);
1140         else
1141                 sta_ps_end(sta_inf);
1142
1143         return 0;
1144 }
1145 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1146
1147 static ieee80211_rx_result debug_noinline
1148 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1149 {
1150         struct ieee80211_sub_if_data *sdata = rx->sdata;
1151         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1152         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1153         int tid, ac;
1154
1155         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1156                 return RX_CONTINUE;
1157
1158         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1159             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1160                 return RX_CONTINUE;
1161
1162         /*
1163          * The device handles station powersave, so don't do anything about
1164          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1165          * it to mac80211 since they're handled.)
1166          */
1167         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1168                 return RX_CONTINUE;
1169
1170         /*
1171          * Don't do anything if the station isn't already asleep. In
1172          * the uAPSD case, the station will probably be marked asleep,
1173          * in the PS-Poll case the station must be confused ...
1174          */
1175         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1176                 return RX_CONTINUE;
1177
1178         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1179                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1180                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1181                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1182                         else
1183                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1184                 }
1185
1186                 /* Free PS Poll skb here instead of returning RX_DROP that would
1187                  * count as an dropped frame. */
1188                 dev_kfree_skb(rx->skb);
1189
1190                 return RX_QUEUED;
1191         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1192                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1193                    ieee80211_has_pm(hdr->frame_control) &&
1194                    (ieee80211_is_data_qos(hdr->frame_control) ||
1195                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1196                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1197                 ac = ieee802_1d_to_ac[tid & 7];
1198
1199                 /*
1200                  * If this AC is not trigger-enabled do nothing.
1201                  *
1202                  * NB: This could/should check a separate bitmap of trigger-
1203                  * enabled queues, but for now we only implement uAPSD w/o
1204                  * TSPEC changes to the ACs, so they're always the same.
1205                  */
1206                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1207                         return RX_CONTINUE;
1208
1209                 /* if we are in a service period, do nothing */
1210                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1211                         return RX_CONTINUE;
1212
1213                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1214                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1215                 else
1216                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1217         }
1218
1219         return RX_CONTINUE;
1220 }
1221
1222 static ieee80211_rx_result debug_noinline
1223 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1224 {
1225         struct sta_info *sta = rx->sta;
1226         struct sk_buff *skb = rx->skb;
1227         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1228         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1229         int i;
1230
1231         if (!sta)
1232                 return RX_CONTINUE;
1233
1234         /*
1235          * Update last_rx only for IBSS packets which are for the current
1236          * BSSID and for station already AUTHORIZED to avoid keeping the
1237          * current IBSS network alive in cases where other STAs start
1238          * using different BSSID. This will also give the station another
1239          * chance to restart the authentication/authorization in case
1240          * something went wrong the first time.
1241          */
1242         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1243                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1244                                                 NL80211_IFTYPE_ADHOC);
1245                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1246                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1247                         sta->last_rx = jiffies;
1248                         if (ieee80211_is_data(hdr->frame_control)) {
1249                                 sta->last_rx_rate_idx = status->rate_idx;
1250                                 sta->last_rx_rate_flag = status->flag;
1251                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1252                         }
1253                 }
1254         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1255                 /*
1256                  * Mesh beacons will update last_rx when if they are found to
1257                  * match the current local configuration when processed.
1258                  */
1259                 sta->last_rx = jiffies;
1260                 if (ieee80211_is_data(hdr->frame_control)) {
1261                         sta->last_rx_rate_idx = status->rate_idx;
1262                         sta->last_rx_rate_flag = status->flag;
1263                         sta->last_rx_rate_vht_nss = status->vht_nss;
1264                 }
1265         }
1266
1267         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1268                 return RX_CONTINUE;
1269
1270         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1271                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1272
1273         sta->rx_fragments++;
1274         sta->rx_bytes += rx->skb->len;
1275         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1276                 sta->last_signal = status->signal;
1277                 ewma_add(&sta->avg_signal, -status->signal);
1278         }
1279
1280         if (status->chains) {
1281                 sta->chains = status->chains;
1282                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1283                         int signal = status->chain_signal[i];
1284
1285                         if (!(status->chains & BIT(i)))
1286                                 continue;
1287
1288                         sta->chain_signal_last[i] = signal;
1289                         ewma_add(&sta->chain_signal_avg[i], -signal);
1290                 }
1291         }
1292
1293         /*
1294          * Change STA power saving mode only at the end of a frame
1295          * exchange sequence.
1296          */
1297         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1298             !ieee80211_has_morefrags(hdr->frame_control) &&
1299             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1300             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1301              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1302                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1303                         /*
1304                          * Ignore doze->wake transitions that are
1305                          * indicated by non-data frames, the standard
1306                          * is unclear here, but for example going to
1307                          * PS mode and then scanning would cause a
1308                          * doze->wake transition for the probe request,
1309                          * and that is clearly undesirable.
1310                          */
1311                         if (ieee80211_is_data(hdr->frame_control) &&
1312                             !ieee80211_has_pm(hdr->frame_control))
1313                                 sta_ps_end(sta);
1314                 } else {
1315                         if (ieee80211_has_pm(hdr->frame_control))
1316                                 sta_ps_start(sta);
1317                 }
1318         }
1319
1320         /* mesh power save support */
1321         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1322                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1323
1324         /*
1325          * Drop (qos-)data::nullfunc frames silently, since they
1326          * are used only to control station power saving mode.
1327          */
1328         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1329             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1330                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1331
1332                 /*
1333                  * If we receive a 4-addr nullfunc frame from a STA
1334                  * that was not moved to a 4-addr STA vlan yet send
1335                  * the event to userspace and for older hostapd drop
1336                  * the frame to the monitor interface.
1337                  */
1338                 if (ieee80211_has_a4(hdr->frame_control) &&
1339                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1340                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1341                       !rx->sdata->u.vlan.sta))) {
1342                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1343                                 cfg80211_rx_unexpected_4addr_frame(
1344                                         rx->sdata->dev, sta->sta.addr,
1345                                         GFP_ATOMIC);
1346                         return RX_DROP_MONITOR;
1347                 }
1348                 /*
1349                  * Update counter and free packet here to avoid
1350                  * counting this as a dropped packed.
1351                  */
1352                 sta->rx_packets++;
1353                 dev_kfree_skb(rx->skb);
1354                 return RX_QUEUED;
1355         }
1356
1357         return RX_CONTINUE;
1358 } /* ieee80211_rx_h_sta_process */
1359
1360 static ieee80211_rx_result debug_noinline
1361 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1362 {
1363         struct sk_buff *skb = rx->skb;
1364         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1366         int keyidx;
1367         int hdrlen;
1368         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1369         struct ieee80211_key *sta_ptk = NULL;
1370         int mmie_keyidx = -1;
1371         __le16 fc;
1372
1373         /*
1374          * Key selection 101
1375          *
1376          * There are four types of keys:
1377          *  - GTK (group keys)
1378          *  - IGTK (group keys for management frames)
1379          *  - PTK (pairwise keys)
1380          *  - STK (station-to-station pairwise keys)
1381          *
1382          * When selecting a key, we have to distinguish between multicast
1383          * (including broadcast) and unicast frames, the latter can only
1384          * use PTKs and STKs while the former always use GTKs and IGTKs.
1385          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1386          * unicast frames can also use key indices like GTKs. Hence, if we
1387          * don't have a PTK/STK we check the key index for a WEP key.
1388          *
1389          * Note that in a regular BSS, multicast frames are sent by the
1390          * AP only, associated stations unicast the frame to the AP first
1391          * which then multicasts it on their behalf.
1392          *
1393          * There is also a slight problem in IBSS mode: GTKs are negotiated
1394          * with each station, that is something we don't currently handle.
1395          * The spec seems to expect that one negotiates the same key with
1396          * every station but there's no such requirement; VLANs could be
1397          * possible.
1398          */
1399
1400         /*
1401          * No point in finding a key and decrypting if the frame is neither
1402          * addressed to us nor a multicast frame.
1403          */
1404         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1405                 return RX_CONTINUE;
1406
1407         /* start without a key */
1408         rx->key = NULL;
1409
1410         if (rx->sta)
1411                 sta_ptk = rcu_dereference(rx->sta->ptk);
1412
1413         fc = hdr->frame_control;
1414
1415         if (!ieee80211_has_protected(fc))
1416                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1417
1418         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1419                 rx->key = sta_ptk;
1420                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1421                     (status->flag & RX_FLAG_IV_STRIPPED))
1422                         return RX_CONTINUE;
1423                 /* Skip decryption if the frame is not protected. */
1424                 if (!ieee80211_has_protected(fc))
1425                         return RX_CONTINUE;
1426         } else if (mmie_keyidx >= 0) {
1427                 /* Broadcast/multicast robust management frame / BIP */
1428                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1429                     (status->flag & RX_FLAG_IV_STRIPPED))
1430                         return RX_CONTINUE;
1431
1432                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1433                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1434                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1435                 if (rx->sta)
1436                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1437                 if (!rx->key)
1438                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1439         } else if (!ieee80211_has_protected(fc)) {
1440                 /*
1441                  * The frame was not protected, so skip decryption. However, we
1442                  * need to set rx->key if there is a key that could have been
1443                  * used so that the frame may be dropped if encryption would
1444                  * have been expected.
1445                  */
1446                 struct ieee80211_key *key = NULL;
1447                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1448                 int i;
1449
1450                 if (ieee80211_is_mgmt(fc) &&
1451                     is_multicast_ether_addr(hdr->addr1) &&
1452                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1453                         rx->key = key;
1454                 else {
1455                         if (rx->sta) {
1456                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1457                                         key = rcu_dereference(rx->sta->gtk[i]);
1458                                         if (key)
1459                                                 break;
1460                                 }
1461                         }
1462                         if (!key) {
1463                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1464                                         key = rcu_dereference(sdata->keys[i]);
1465                                         if (key)
1466                                                 break;
1467                                 }
1468                         }
1469                         if (key)
1470                                 rx->key = key;
1471                 }
1472                 return RX_CONTINUE;
1473         } else {
1474                 u8 keyid;
1475                 /*
1476                  * The device doesn't give us the IV so we won't be
1477                  * able to look up the key. That's ok though, we
1478                  * don't need to decrypt the frame, we just won't
1479                  * be able to keep statistics accurate.
1480                  * Except for key threshold notifications, should
1481                  * we somehow allow the driver to tell us which key
1482                  * the hardware used if this flag is set?
1483                  */
1484                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1485                     (status->flag & RX_FLAG_IV_STRIPPED))
1486                         return RX_CONTINUE;
1487
1488                 hdrlen = ieee80211_hdrlen(fc);
1489
1490                 if (rx->skb->len < 8 + hdrlen)
1491                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1492
1493                 /*
1494                  * no need to call ieee80211_wep_get_keyidx,
1495                  * it verifies a bunch of things we've done already
1496                  */
1497                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1498                 keyidx = keyid >> 6;
1499
1500                 /* check per-station GTK first, if multicast packet */
1501                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1502                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1503
1504                 /* if not found, try default key */
1505                 if (!rx->key) {
1506                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1507
1508                         /*
1509                          * RSNA-protected unicast frames should always be
1510                          * sent with pairwise or station-to-station keys,
1511                          * but for WEP we allow using a key index as well.
1512                          */
1513                         if (rx->key &&
1514                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1515                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1516                             !is_multicast_ether_addr(hdr->addr1))
1517                                 rx->key = NULL;
1518                 }
1519         }
1520
1521         if (rx->key) {
1522                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1523                         return RX_DROP_MONITOR;
1524
1525                 rx->key->tx_rx_count++;
1526                 /* TODO: add threshold stuff again */
1527         } else {
1528                 return RX_DROP_MONITOR;
1529         }
1530
1531         switch (rx->key->conf.cipher) {
1532         case WLAN_CIPHER_SUITE_WEP40:
1533         case WLAN_CIPHER_SUITE_WEP104:
1534                 result = ieee80211_crypto_wep_decrypt(rx);
1535                 break;
1536         case WLAN_CIPHER_SUITE_TKIP:
1537                 result = ieee80211_crypto_tkip_decrypt(rx);
1538                 break;
1539         case WLAN_CIPHER_SUITE_CCMP:
1540                 result = ieee80211_crypto_ccmp_decrypt(rx);
1541                 break;
1542         case WLAN_CIPHER_SUITE_AES_CMAC:
1543                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1544                 break;
1545         default:
1546                 /*
1547                  * We can reach here only with HW-only algorithms
1548                  * but why didn't it decrypt the frame?!
1549                  */
1550                 return RX_DROP_UNUSABLE;
1551         }
1552
1553         /* the hdr variable is invalid after the decrypt handlers */
1554
1555         /* either the frame has been decrypted or will be dropped */
1556         status->flag |= RX_FLAG_DECRYPTED;
1557
1558         return result;
1559 }
1560
1561 static inline struct ieee80211_fragment_entry *
1562 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1563                          unsigned int frag, unsigned int seq, int rx_queue,
1564                          struct sk_buff **skb)
1565 {
1566         struct ieee80211_fragment_entry *entry;
1567
1568         entry = &sdata->fragments[sdata->fragment_next++];
1569         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1570                 sdata->fragment_next = 0;
1571
1572         if (!skb_queue_empty(&entry->skb_list))
1573                 __skb_queue_purge(&entry->skb_list);
1574
1575         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1576         *skb = NULL;
1577         entry->first_frag_time = jiffies;
1578         entry->seq = seq;
1579         entry->rx_queue = rx_queue;
1580         entry->last_frag = frag;
1581         entry->ccmp = 0;
1582         entry->extra_len = 0;
1583
1584         return entry;
1585 }
1586
1587 static inline struct ieee80211_fragment_entry *
1588 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1589                           unsigned int frag, unsigned int seq,
1590                           int rx_queue, struct ieee80211_hdr *hdr)
1591 {
1592         struct ieee80211_fragment_entry *entry;
1593         int i, idx;
1594
1595         idx = sdata->fragment_next;
1596         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1597                 struct ieee80211_hdr *f_hdr;
1598
1599                 idx--;
1600                 if (idx < 0)
1601                         idx = IEEE80211_FRAGMENT_MAX - 1;
1602
1603                 entry = &sdata->fragments[idx];
1604                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1605                     entry->rx_queue != rx_queue ||
1606                     entry->last_frag + 1 != frag)
1607                         continue;
1608
1609                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1610
1611                 /*
1612                  * Check ftype and addresses are equal, else check next fragment
1613                  */
1614                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1615                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1616                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1617                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1618                         continue;
1619
1620                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1621                         __skb_queue_purge(&entry->skb_list);
1622                         continue;
1623                 }
1624                 return entry;
1625         }
1626
1627         return NULL;
1628 }
1629
1630 static ieee80211_rx_result debug_noinline
1631 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1632 {
1633         struct ieee80211_hdr *hdr;
1634         u16 sc;
1635         __le16 fc;
1636         unsigned int frag, seq;
1637         struct ieee80211_fragment_entry *entry;
1638         struct sk_buff *skb;
1639         struct ieee80211_rx_status *status;
1640
1641         hdr = (struct ieee80211_hdr *)rx->skb->data;
1642         fc = hdr->frame_control;
1643
1644         if (ieee80211_is_ctl(fc))
1645                 return RX_CONTINUE;
1646
1647         sc = le16_to_cpu(hdr->seq_ctrl);
1648         frag = sc & IEEE80211_SCTL_FRAG;
1649
1650         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1651                    is_multicast_ether_addr(hdr->addr1))) {
1652                 /* not fragmented */
1653                 goto out;
1654         }
1655         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1656
1657         if (skb_linearize(rx->skb))
1658                 return RX_DROP_UNUSABLE;
1659
1660         /*
1661          *  skb_linearize() might change the skb->data and
1662          *  previously cached variables (in this case, hdr) need to
1663          *  be refreshed with the new data.
1664          */
1665         hdr = (struct ieee80211_hdr *)rx->skb->data;
1666         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1667
1668         if (frag == 0) {
1669                 /* This is the first fragment of a new frame. */
1670                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1671                                                  rx->seqno_idx, &(rx->skb));
1672                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1673                     ieee80211_has_protected(fc)) {
1674                         int queue = rx->security_idx;
1675                         /* Store CCMP PN so that we can verify that the next
1676                          * fragment has a sequential PN value. */
1677                         entry->ccmp = 1;
1678                         memcpy(entry->last_pn,
1679                                rx->key->u.ccmp.rx_pn[queue],
1680                                IEEE80211_CCMP_PN_LEN);
1681                 }
1682                 return RX_QUEUED;
1683         }
1684
1685         /* This is a fragment for a frame that should already be pending in
1686          * fragment cache. Add this fragment to the end of the pending entry.
1687          */
1688         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1689                                           rx->seqno_idx, hdr);
1690         if (!entry) {
1691                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1692                 return RX_DROP_MONITOR;
1693         }
1694
1695         /* Verify that MPDUs within one MSDU have sequential PN values.
1696          * (IEEE 802.11i, 8.3.3.4.5) */
1697         if (entry->ccmp) {
1698                 int i;
1699                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1700                 int queue;
1701                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1702                         return RX_DROP_UNUSABLE;
1703                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1704                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1705                         pn[i]++;
1706                         if (pn[i])
1707                                 break;
1708                 }
1709                 queue = rx->security_idx;
1710                 rpn = rx->key->u.ccmp.rx_pn[queue];
1711                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1712                         return RX_DROP_UNUSABLE;
1713                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1714         }
1715
1716         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1717         __skb_queue_tail(&entry->skb_list, rx->skb);
1718         entry->last_frag = frag;
1719         entry->extra_len += rx->skb->len;
1720         if (ieee80211_has_morefrags(fc)) {
1721                 rx->skb = NULL;
1722                 return RX_QUEUED;
1723         }
1724
1725         rx->skb = __skb_dequeue(&entry->skb_list);
1726         if (skb_tailroom(rx->skb) < entry->extra_len) {
1727                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1728                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1729                                               GFP_ATOMIC))) {
1730                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1731                         __skb_queue_purge(&entry->skb_list);
1732                         return RX_DROP_UNUSABLE;
1733                 }
1734         }
1735         while ((skb = __skb_dequeue(&entry->skb_list))) {
1736                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1737                 dev_kfree_skb(skb);
1738         }
1739
1740         /* Complete frame has been reassembled - process it now */
1741         status = IEEE80211_SKB_RXCB(rx->skb);
1742         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1743
1744  out:
1745         if (rx->sta)
1746                 rx->sta->rx_packets++;
1747         if (is_multicast_ether_addr(hdr->addr1))
1748                 rx->local->dot11MulticastReceivedFrameCount++;
1749         else
1750                 ieee80211_led_rx(rx->local);
1751         return RX_CONTINUE;
1752 }
1753
1754 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1755 {
1756         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1757                 return -EACCES;
1758
1759         return 0;
1760 }
1761
1762 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1763 {
1764         struct sk_buff *skb = rx->skb;
1765         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1766
1767         /*
1768          * Pass through unencrypted frames if the hardware has
1769          * decrypted them already.
1770          */
1771         if (status->flag & RX_FLAG_DECRYPTED)
1772                 return 0;
1773
1774         /* Drop unencrypted frames if key is set. */
1775         if (unlikely(!ieee80211_has_protected(fc) &&
1776                      !ieee80211_is_nullfunc(fc) &&
1777                      ieee80211_is_data(fc) &&
1778                      (rx->key || rx->sdata->drop_unencrypted)))
1779                 return -EACCES;
1780
1781         return 0;
1782 }
1783
1784 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1785 {
1786         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1787         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1788         __le16 fc = hdr->frame_control;
1789
1790         /*
1791          * Pass through unencrypted frames if the hardware has
1792          * decrypted them already.
1793          */
1794         if (status->flag & RX_FLAG_DECRYPTED)
1795                 return 0;
1796
1797         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1798                 if (unlikely(!ieee80211_has_protected(fc) &&
1799                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1800                              rx->key)) {
1801                         if (ieee80211_is_deauth(fc) ||
1802                             ieee80211_is_disassoc(fc))
1803                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1804                                                              rx->skb->data,
1805                                                              rx->skb->len);
1806                         return -EACCES;
1807                 }
1808                 /* BIP does not use Protected field, so need to check MMIE */
1809                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1810                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1811                         if (ieee80211_is_deauth(fc) ||
1812                             ieee80211_is_disassoc(fc))
1813                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1814                                                              rx->skb->data,
1815                                                              rx->skb->len);
1816                         return -EACCES;
1817                 }
1818                 /*
1819                  * When using MFP, Action frames are not allowed prior to
1820                  * having configured keys.
1821                  */
1822                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1823                              ieee80211_is_robust_mgmt_frame(
1824                                      (struct ieee80211_hdr *) rx->skb->data)))
1825                         return -EACCES;
1826         }
1827
1828         return 0;
1829 }
1830
1831 static int
1832 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1833 {
1834         struct ieee80211_sub_if_data *sdata = rx->sdata;
1835         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1836         bool check_port_control = false;
1837         struct ethhdr *ehdr;
1838         int ret;
1839
1840         *port_control = false;
1841         if (ieee80211_has_a4(hdr->frame_control) &&
1842             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1843                 return -1;
1844
1845         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1846             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1847
1848                 if (!sdata->u.mgd.use_4addr)
1849                         return -1;
1850                 else
1851                         check_port_control = true;
1852         }
1853
1854         if (is_multicast_ether_addr(hdr->addr1) &&
1855             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1856                 return -1;
1857
1858         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1859         if (ret < 0)
1860                 return ret;
1861
1862         ehdr = (struct ethhdr *) rx->skb->data;
1863         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1864                 *port_control = true;
1865         else if (check_port_control)
1866                 return -1;
1867
1868         return 0;
1869 }
1870
1871 /*
1872  * requires that rx->skb is a frame with ethernet header
1873  */
1874 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1875 {
1876         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1877                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1878         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1879
1880         /*
1881          * Allow EAPOL frames to us/the PAE group address regardless
1882          * of whether the frame was encrypted or not.
1883          */
1884         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1885             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1886              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1887                 return true;
1888
1889         if (ieee80211_802_1x_port_control(rx) ||
1890             ieee80211_drop_unencrypted(rx, fc))
1891                 return false;
1892
1893         return true;
1894 }
1895
1896 /*
1897  * requires that rx->skb is a frame with ethernet header
1898  */
1899 static void
1900 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1901 {
1902         struct ieee80211_sub_if_data *sdata = rx->sdata;
1903         struct net_device *dev = sdata->dev;
1904         struct sk_buff *skb, *xmit_skb;
1905         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1906         struct sta_info *dsta;
1907         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1908
1909         skb = rx->skb;
1910         xmit_skb = NULL;
1911
1912         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1913              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1914             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1915             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1916             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1917                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1918                         /*
1919                          * send multicast frames both to higher layers in
1920                          * local net stack and back to the wireless medium
1921                          */
1922                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1923                         if (!xmit_skb)
1924                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1925                                                     dev->name);
1926                 } else {
1927                         dsta = sta_info_get(sdata, skb->data);
1928                         if (dsta) {
1929                                 /*
1930                                  * The destination station is associated to
1931                                  * this AP (in this VLAN), so send the frame
1932                                  * directly to it and do not pass it to local
1933                                  * net stack.
1934                                  */
1935                                 xmit_skb = skb;
1936                                 skb = NULL;
1937                         }
1938                 }
1939         }
1940
1941         if (skb) {
1942                 int align __maybe_unused;
1943
1944 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1945                 /*
1946                  * 'align' will only take the values 0 or 2 here
1947                  * since all frames are required to be aligned
1948                  * to 2-byte boundaries when being passed to
1949                  * mac80211; the code here works just as well if
1950                  * that isn't true, but mac80211 assumes it can
1951                  * access fields as 2-byte aligned (e.g. for
1952                  * compare_ether_addr)
1953                  */
1954                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1955                 if (align) {
1956                         if (WARN_ON(skb_headroom(skb) < 3)) {
1957                                 dev_kfree_skb(skb);
1958                                 skb = NULL;
1959                         } else {
1960                                 u8 *data = skb->data;
1961                                 size_t len = skb_headlen(skb);
1962                                 skb->data -= align;
1963                                 memmove(skb->data, data, len);
1964                                 skb_set_tail_pointer(skb, len);
1965                         }
1966                 }
1967 #endif
1968
1969                 if (skb) {
1970                         /* deliver to local stack */
1971                         skb->protocol = eth_type_trans(skb, dev);
1972                         memset(skb->cb, 0, sizeof(skb->cb));
1973                         netif_receive_skb(skb);
1974                 }
1975         }
1976
1977         if (xmit_skb) {
1978                 /*
1979                  * Send to wireless media and increase priority by 256 to
1980                  * keep the received priority instead of reclassifying
1981                  * the frame (see cfg80211_classify8021d).
1982                  */
1983                 xmit_skb->priority += 256;
1984                 xmit_skb->protocol = htons(ETH_P_802_3);
1985                 skb_reset_network_header(xmit_skb);
1986                 skb_reset_mac_header(xmit_skb);
1987                 dev_queue_xmit(xmit_skb);
1988         }
1989 }
1990
1991 static ieee80211_rx_result debug_noinline
1992 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1993 {
1994         struct net_device *dev = rx->sdata->dev;
1995         struct sk_buff *skb = rx->skb;
1996         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1997         __le16 fc = hdr->frame_control;
1998         struct sk_buff_head frame_list;
1999         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2000
2001         if (unlikely(!ieee80211_is_data(fc)))
2002                 return RX_CONTINUE;
2003
2004         if (unlikely(!ieee80211_is_data_present(fc)))
2005                 return RX_DROP_MONITOR;
2006
2007         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2008                 return RX_CONTINUE;
2009
2010         if (ieee80211_has_a4(hdr->frame_control) &&
2011             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2012             !rx->sdata->u.vlan.sta)
2013                 return RX_DROP_UNUSABLE;
2014
2015         if (is_multicast_ether_addr(hdr->addr1) &&
2016             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2017               rx->sdata->u.vlan.sta) ||
2018              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2019               rx->sdata->u.mgd.use_4addr)))
2020                 return RX_DROP_UNUSABLE;
2021
2022         skb->dev = dev;
2023         __skb_queue_head_init(&frame_list);
2024
2025         if (skb_linearize(skb))
2026                 return RX_DROP_UNUSABLE;
2027
2028         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2029                                  rx->sdata->vif.type,
2030                                  rx->local->hw.extra_tx_headroom, true);
2031
2032         while (!skb_queue_empty(&frame_list)) {
2033                 rx->skb = __skb_dequeue(&frame_list);
2034
2035                 if (!ieee80211_frame_allowed(rx, fc)) {
2036                         dev_kfree_skb(rx->skb);
2037                         continue;
2038                 }
2039                 dev->stats.rx_packets++;
2040                 dev->stats.rx_bytes += rx->skb->len;
2041
2042                 ieee80211_deliver_skb(rx);
2043         }
2044
2045         return RX_QUEUED;
2046 }
2047
2048 #ifdef CONFIG_MAC80211_MESH
2049 static ieee80211_rx_result
2050 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2051 {
2052         struct ieee80211_hdr *fwd_hdr, *hdr;
2053         struct ieee80211_tx_info *info;
2054         struct ieee80211s_hdr *mesh_hdr;
2055         struct sk_buff *skb = rx->skb, *fwd_skb;
2056         struct ieee80211_local *local = rx->local;
2057         struct ieee80211_sub_if_data *sdata = rx->sdata;
2058         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2059         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2060         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2061         u16 q, hdrlen;
2062
2063         hdr = (struct ieee80211_hdr *) skb->data;
2064         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2065
2066         /* make sure fixed part of mesh header is there, also checks skb len */
2067         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2068                 return RX_DROP_MONITOR;
2069
2070         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2071
2072         /* make sure full mesh header is there, also checks skb len */
2073         if (!pskb_may_pull(rx->skb,
2074                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2075                 return RX_DROP_MONITOR;
2076
2077         /* reload pointers */
2078         hdr = (struct ieee80211_hdr *) skb->data;
2079         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2080
2081         /* frame is in RMC, don't forward */
2082         if (ieee80211_is_data(hdr->frame_control) &&
2083             is_multicast_ether_addr(hdr->addr1) &&
2084             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2085                 return RX_DROP_MONITOR;
2086
2087         if (!ieee80211_is_data(hdr->frame_control) ||
2088             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2089                 return RX_CONTINUE;
2090
2091         if (!mesh_hdr->ttl)
2092                 return RX_DROP_MONITOR;
2093
2094         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2095                 struct mesh_path *mppath;
2096                 char *proxied_addr;
2097                 char *mpp_addr;
2098
2099                 if (is_multicast_ether_addr(hdr->addr1)) {
2100                         mpp_addr = hdr->addr3;
2101                         proxied_addr = mesh_hdr->eaddr1;
2102                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2103                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2104                         mpp_addr = hdr->addr4;
2105                         proxied_addr = mesh_hdr->eaddr2;
2106                 } else {
2107                         return RX_DROP_MONITOR;
2108                 }
2109
2110                 rcu_read_lock();
2111                 mppath = mpp_path_lookup(sdata, proxied_addr);
2112                 if (!mppath) {
2113                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2114                 } else {
2115                         spin_lock_bh(&mppath->state_lock);
2116                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2117                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2118                         spin_unlock_bh(&mppath->state_lock);
2119                 }
2120                 rcu_read_unlock();
2121         }
2122
2123         /* Frame has reached destination.  Don't forward */
2124         if (!is_multicast_ether_addr(hdr->addr1) &&
2125             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2126                 return RX_CONTINUE;
2127
2128         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2129         if (ieee80211_queue_stopped(&local->hw, q)) {
2130                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2131                 return RX_DROP_MONITOR;
2132         }
2133         skb_set_queue_mapping(skb, q);
2134
2135         if (!--mesh_hdr->ttl) {
2136                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2137                 goto out;
2138         }
2139
2140         if (!ifmsh->mshcfg.dot11MeshForwarding)
2141                 goto out;
2142
2143         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2144         if (!fwd_skb) {
2145                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2146                                     sdata->name);
2147                 goto out;
2148         }
2149
2150         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2151         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2152         info = IEEE80211_SKB_CB(fwd_skb);
2153         memset(info, 0, sizeof(*info));
2154         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2155         info->control.vif = &rx->sdata->vif;
2156         info->control.jiffies = jiffies;
2157         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2158                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2159                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2160                 /* update power mode indication when forwarding */
2161                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2162         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2163                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2164                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2165         } else {
2166                 /* unable to resolve next hop */
2167                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2168                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2169                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2170                 kfree_skb(fwd_skb);
2171                 return RX_DROP_MONITOR;
2172         }
2173
2174         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2175         ieee80211_add_pending_skb(local, fwd_skb);
2176  out:
2177         if (is_multicast_ether_addr(hdr->addr1) ||
2178             sdata->dev->flags & IFF_PROMISC)
2179                 return RX_CONTINUE;
2180         else
2181                 return RX_DROP_MONITOR;
2182 }
2183 #endif
2184
2185 static ieee80211_rx_result debug_noinline
2186 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2187 {
2188         struct ieee80211_sub_if_data *sdata = rx->sdata;
2189         struct ieee80211_local *local = rx->local;
2190         struct net_device *dev = sdata->dev;
2191         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2192         __le16 fc = hdr->frame_control;
2193         bool port_control;
2194         int err;
2195
2196         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2197                 return RX_CONTINUE;
2198
2199         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2200                 return RX_DROP_MONITOR;
2201
2202         /*
2203          * Send unexpected-4addr-frame event to hostapd. For older versions,
2204          * also drop the frame to cooked monitor interfaces.
2205          */
2206         if (ieee80211_has_a4(hdr->frame_control) &&
2207             sdata->vif.type == NL80211_IFTYPE_AP) {
2208                 if (rx->sta &&
2209                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2210                         cfg80211_rx_unexpected_4addr_frame(
2211                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2212                 return RX_DROP_MONITOR;
2213         }
2214
2215         err = __ieee80211_data_to_8023(rx, &port_control);
2216         if (unlikely(err))
2217                 return RX_DROP_UNUSABLE;
2218
2219         if (!ieee80211_frame_allowed(rx, fc))
2220                 return RX_DROP_MONITOR;
2221
2222         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2223             unlikely(port_control) && sdata->bss) {
2224                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2225                                      u.ap);
2226                 dev = sdata->dev;
2227                 rx->sdata = sdata;
2228         }
2229
2230         rx->skb->dev = dev;
2231
2232         dev->stats.rx_packets++;
2233         dev->stats.rx_bytes += rx->skb->len;
2234
2235         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2236             !is_multicast_ether_addr(
2237                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2238             (!local->scanning &&
2239              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2240                         mod_timer(&local->dynamic_ps_timer, jiffies +
2241                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2242         }
2243
2244         ieee80211_deliver_skb(rx);
2245
2246         return RX_QUEUED;
2247 }
2248
2249 static ieee80211_rx_result debug_noinline
2250 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2251 {
2252         struct sk_buff *skb = rx->skb;
2253         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2254         struct tid_ampdu_rx *tid_agg_rx;
2255         u16 start_seq_num;
2256         u16 tid;
2257
2258         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2259                 return RX_CONTINUE;
2260
2261         if (ieee80211_is_back_req(bar->frame_control)) {
2262                 struct {
2263                         __le16 control, start_seq_num;
2264                 } __packed bar_data;
2265
2266                 if (!rx->sta)
2267                         return RX_DROP_MONITOR;
2268
2269                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2270                                   &bar_data, sizeof(bar_data)))
2271                         return RX_DROP_MONITOR;
2272
2273                 tid = le16_to_cpu(bar_data.control) >> 12;
2274
2275                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2276                 if (!tid_agg_rx)
2277                         return RX_DROP_MONITOR;
2278
2279                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2280
2281                 /* reset session timer */
2282                 if (tid_agg_rx->timeout)
2283                         mod_timer(&tid_agg_rx->session_timer,
2284                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2285
2286                 spin_lock(&tid_agg_rx->reorder_lock);
2287                 /* release stored frames up to start of BAR */
2288                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2289                                                  start_seq_num, frames);
2290                 spin_unlock(&tid_agg_rx->reorder_lock);
2291
2292                 kfree_skb(skb);
2293                 return RX_QUEUED;
2294         }
2295
2296         /*
2297          * After this point, we only want management frames,
2298          * so we can drop all remaining control frames to
2299          * cooked monitor interfaces.
2300          */
2301         return RX_DROP_MONITOR;
2302 }
2303
2304 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2305                                            struct ieee80211_mgmt *mgmt,
2306                                            size_t len)
2307 {
2308         struct ieee80211_local *local = sdata->local;
2309         struct sk_buff *skb;
2310         struct ieee80211_mgmt *resp;
2311
2312         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2313                 /* Not to own unicast address */
2314                 return;
2315         }
2316
2317         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2318             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2319                 /* Not from the current AP or not associated yet. */
2320                 return;
2321         }
2322
2323         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2324                 /* Too short SA Query request frame */
2325                 return;
2326         }
2327
2328         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2329         if (skb == NULL)
2330                 return;
2331
2332         skb_reserve(skb, local->hw.extra_tx_headroom);
2333         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2334         memset(resp, 0, 24);
2335         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2336         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2337         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2338         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2339                                           IEEE80211_STYPE_ACTION);
2340         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2341         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2342         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2343         memcpy(resp->u.action.u.sa_query.trans_id,
2344                mgmt->u.action.u.sa_query.trans_id,
2345                WLAN_SA_QUERY_TR_ID_LEN);
2346
2347         ieee80211_tx_skb(sdata, skb);
2348 }
2349
2350 static ieee80211_rx_result debug_noinline
2351 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2352 {
2353         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2354         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2355
2356         /*
2357          * From here on, look only at management frames.
2358          * Data and control frames are already handled,
2359          * and unknown (reserved) frames are useless.
2360          */
2361         if (rx->skb->len < 24)
2362                 return RX_DROP_MONITOR;
2363
2364         if (!ieee80211_is_mgmt(mgmt->frame_control))
2365                 return RX_DROP_MONITOR;
2366
2367         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2368             ieee80211_is_beacon(mgmt->frame_control) &&
2369             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2370                 int sig = 0;
2371
2372                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2373                         sig = status->signal;
2374
2375                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2376                                             rx->skb->data, rx->skb->len,
2377                                             status->freq, sig);
2378                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2379         }
2380
2381         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2382                 return RX_DROP_MONITOR;
2383
2384         if (ieee80211_drop_unencrypted_mgmt(rx))
2385                 return RX_DROP_UNUSABLE;
2386
2387         return RX_CONTINUE;
2388 }
2389
2390 static ieee80211_rx_result debug_noinline
2391 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2392 {
2393         struct ieee80211_local *local = rx->local;
2394         struct ieee80211_sub_if_data *sdata = rx->sdata;
2395         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2396         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2397         int len = rx->skb->len;
2398
2399         if (!ieee80211_is_action(mgmt->frame_control))
2400                 return RX_CONTINUE;
2401
2402         /* drop too small frames */
2403         if (len < IEEE80211_MIN_ACTION_SIZE)
2404                 return RX_DROP_UNUSABLE;
2405
2406         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2407             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2408             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2409                 return RX_DROP_UNUSABLE;
2410
2411         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2412                 return RX_DROP_UNUSABLE;
2413
2414         switch (mgmt->u.action.category) {
2415         case WLAN_CATEGORY_HT:
2416                 /* reject HT action frames from stations not supporting HT */
2417                 if (!rx->sta->sta.ht_cap.ht_supported)
2418                         goto invalid;
2419
2420                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2421                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2422                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2423                     sdata->vif.type != NL80211_IFTYPE_AP &&
2424                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2425                         break;
2426
2427                 /* verify action & smps_control/chanwidth are present */
2428                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2429                         goto invalid;
2430
2431                 switch (mgmt->u.action.u.ht_smps.action) {
2432                 case WLAN_HT_ACTION_SMPS: {
2433                         struct ieee80211_supported_band *sband;
2434                         enum ieee80211_smps_mode smps_mode;
2435
2436                         /* convert to HT capability */
2437                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2438                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2439                                 smps_mode = IEEE80211_SMPS_OFF;
2440                                 break;
2441                         case WLAN_HT_SMPS_CONTROL_STATIC:
2442                                 smps_mode = IEEE80211_SMPS_STATIC;
2443                                 break;
2444                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2445                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2446                                 break;
2447                         default:
2448                                 goto invalid;
2449                         }
2450
2451                         /* if no change do nothing */
2452                         if (rx->sta->sta.smps_mode == smps_mode)
2453                                 goto handled;
2454                         rx->sta->sta.smps_mode = smps_mode;
2455
2456                         sband = rx->local->hw.wiphy->bands[status->band];
2457
2458                         rate_control_rate_update(local, sband, rx->sta,
2459                                                  IEEE80211_RC_SMPS_CHANGED);
2460                         goto handled;
2461                 }
2462                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2463                         struct ieee80211_supported_band *sband;
2464                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2465                         enum ieee80211_sta_rx_bandwidth new_bw;
2466
2467                         /* If it doesn't support 40 MHz it can't change ... */
2468                         if (!(rx->sta->sta.ht_cap.cap &
2469                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2470                                 goto handled;
2471
2472                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2473                                 new_bw = IEEE80211_STA_RX_BW_20;
2474                         else
2475                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2476
2477                         if (rx->sta->sta.bandwidth == new_bw)
2478                                 goto handled;
2479
2480                         sband = rx->local->hw.wiphy->bands[status->band];
2481
2482                         rate_control_rate_update(local, sband, rx->sta,
2483                                                  IEEE80211_RC_BW_CHANGED);
2484                         goto handled;
2485                 }
2486                 default:
2487                         goto invalid;
2488                 }
2489
2490                 break;
2491         case WLAN_CATEGORY_PUBLIC:
2492                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2493                         goto invalid;
2494                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2495                         break;
2496                 if (!rx->sta)
2497                         break;
2498                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2499                         break;
2500                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2501                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2502                         break;
2503                 if (len < offsetof(struct ieee80211_mgmt,
2504                                    u.action.u.ext_chan_switch.variable))
2505                         goto invalid;
2506                 goto queue;
2507         case WLAN_CATEGORY_VHT:
2508                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2509                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2510                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2511                     sdata->vif.type != NL80211_IFTYPE_AP &&
2512                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2513                         break;
2514
2515                 /* verify action code is present */
2516                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2517                         goto invalid;
2518
2519                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2520                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2521                         u8 opmode;
2522
2523                         /* verify opmode is present */
2524                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2525                                 goto invalid;
2526
2527                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2528
2529                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2530                                                     opmode, status->band,
2531                                                     false);
2532                         goto handled;
2533                 }
2534                 default:
2535                         break;
2536                 }
2537                 break;
2538         case WLAN_CATEGORY_BACK:
2539                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2540                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2541                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2542                     sdata->vif.type != NL80211_IFTYPE_AP &&
2543                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2544                         break;
2545
2546                 /* verify action_code is present */
2547                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2548                         break;
2549
2550                 switch (mgmt->u.action.u.addba_req.action_code) {
2551                 case WLAN_ACTION_ADDBA_REQ:
2552                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2553                                    sizeof(mgmt->u.action.u.addba_req)))
2554                                 goto invalid;
2555                         break;
2556                 case WLAN_ACTION_ADDBA_RESP:
2557                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2558                                    sizeof(mgmt->u.action.u.addba_resp)))
2559                                 goto invalid;
2560                         break;
2561                 case WLAN_ACTION_DELBA:
2562                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2563                                    sizeof(mgmt->u.action.u.delba)))
2564                                 goto invalid;
2565                         break;
2566                 default:
2567                         goto invalid;
2568                 }
2569
2570                 goto queue;
2571         case WLAN_CATEGORY_SPECTRUM_MGMT:
2572                 /* verify action_code is present */
2573                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2574                         break;
2575
2576                 switch (mgmt->u.action.u.measurement.action_code) {
2577                 case WLAN_ACTION_SPCT_MSR_REQ:
2578                         if (status->band != IEEE80211_BAND_5GHZ)
2579                                 break;
2580
2581                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2582                                    sizeof(mgmt->u.action.u.measurement)))
2583                                 break;
2584
2585                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2586                                 break;
2587
2588                         ieee80211_process_measurement_req(sdata, mgmt, len);
2589                         goto handled;
2590                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2591                         u8 *bssid;
2592                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2593                                    sizeof(mgmt->u.action.u.chan_switch)))
2594                                 break;
2595
2596                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2597                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2598                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2599                                 break;
2600
2601                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2602                                 bssid = sdata->u.mgd.bssid;
2603                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2604                                 bssid = sdata->u.ibss.bssid;
2605                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2606                                 bssid = mgmt->sa;
2607                         else
2608                                 break;
2609
2610                         if (!ether_addr_equal(mgmt->bssid, bssid))
2611                                 break;
2612
2613                         goto queue;
2614                         }
2615                 }
2616                 break;
2617         case WLAN_CATEGORY_SA_QUERY:
2618                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2619                            sizeof(mgmt->u.action.u.sa_query)))
2620                         break;
2621
2622                 switch (mgmt->u.action.u.sa_query.action) {
2623                 case WLAN_ACTION_SA_QUERY_REQUEST:
2624                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2625                                 break;
2626                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2627                         goto handled;
2628                 }
2629                 break;
2630         case WLAN_CATEGORY_SELF_PROTECTED:
2631                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2632                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2633                         break;
2634
2635                 switch (mgmt->u.action.u.self_prot.action_code) {
2636                 case WLAN_SP_MESH_PEERING_OPEN:
2637                 case WLAN_SP_MESH_PEERING_CLOSE:
2638                 case WLAN_SP_MESH_PEERING_CONFIRM:
2639                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2640                                 goto invalid;
2641                         if (sdata->u.mesh.user_mpm)
2642                                 /* userspace handles this frame */
2643                                 break;
2644                         goto queue;
2645                 case WLAN_SP_MGK_INFORM:
2646                 case WLAN_SP_MGK_ACK:
2647                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2648                                 goto invalid;
2649                         break;
2650                 }
2651                 break;
2652         case WLAN_CATEGORY_MESH_ACTION:
2653                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2654                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2655                         break;
2656
2657                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2658                         break;
2659                 if (mesh_action_is_path_sel(mgmt) &&
2660                     !mesh_path_sel_is_hwmp(sdata))
2661                         break;
2662                 goto queue;
2663         }
2664
2665         return RX_CONTINUE;
2666
2667  invalid:
2668         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2669         /* will return in the next handlers */
2670         return RX_CONTINUE;
2671
2672  handled:
2673         if (rx->sta)
2674                 rx->sta->rx_packets++;
2675         dev_kfree_skb(rx->skb);
2676         return RX_QUEUED;
2677
2678  queue:
2679         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2680         skb_queue_tail(&sdata->skb_queue, rx->skb);
2681         ieee80211_queue_work(&local->hw, &sdata->work);
2682         if (rx->sta)
2683                 rx->sta->rx_packets++;
2684         return RX_QUEUED;
2685 }
2686
2687 static ieee80211_rx_result debug_noinline
2688 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2689 {
2690         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2691         int sig = 0;
2692
2693         /* skip known-bad action frames and return them in the next handler */
2694         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2695                 return RX_CONTINUE;
2696
2697         /*
2698          * Getting here means the kernel doesn't know how to handle
2699          * it, but maybe userspace does ... include returned frames
2700          * so userspace can register for those to know whether ones
2701          * it transmitted were processed or returned.
2702          */
2703
2704         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2705                 sig = status->signal;
2706
2707         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2708                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2709                 if (rx->sta)
2710                         rx->sta->rx_packets++;
2711                 dev_kfree_skb(rx->skb);
2712                 return RX_QUEUED;
2713         }
2714
2715         return RX_CONTINUE;
2716 }
2717
2718 static ieee80211_rx_result debug_noinline
2719 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2720 {
2721         struct ieee80211_local *local = rx->local;
2722         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2723         struct sk_buff *nskb;
2724         struct ieee80211_sub_if_data *sdata = rx->sdata;
2725         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2726
2727         if (!ieee80211_is_action(mgmt->frame_control))
2728                 return RX_CONTINUE;
2729
2730         /*
2731          * For AP mode, hostapd is responsible for handling any action
2732          * frames that we didn't handle, including returning unknown
2733          * ones. For all other modes we will return them to the sender,
2734          * setting the 0x80 bit in the action category, as required by
2735          * 802.11-2012 9.24.4.
2736          * Newer versions of hostapd shall also use the management frame
2737          * registration mechanisms, but older ones still use cooked
2738          * monitor interfaces so push all frames there.
2739          */
2740         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2741             (sdata->vif.type == NL80211_IFTYPE_AP ||
2742              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2743                 return RX_DROP_MONITOR;
2744
2745         if (is_multicast_ether_addr(mgmt->da))
2746                 return RX_DROP_MONITOR;
2747
2748         /* do not return rejected action frames */
2749         if (mgmt->u.action.category & 0x80)
2750                 return RX_DROP_UNUSABLE;
2751
2752         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2753                                GFP_ATOMIC);
2754         if (nskb) {
2755                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2756
2757                 nmgmt->u.action.category |= 0x80;
2758                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2759                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2760
2761                 memset(nskb->cb, 0, sizeof(nskb->cb));
2762
2763                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2764                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2765
2766                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2767                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2768                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2769                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2770                                 info->hw_queue =
2771                                         local->hw.offchannel_tx_hw_queue;
2772                 }
2773
2774                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2775                                             status->band);
2776         }
2777         dev_kfree_skb(rx->skb);
2778         return RX_QUEUED;
2779 }
2780
2781 static ieee80211_rx_result debug_noinline
2782 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2783 {
2784         struct ieee80211_sub_if_data *sdata = rx->sdata;
2785         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2786         __le16 stype;
2787
2788         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2789
2790         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2791             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2792             sdata->vif.type != NL80211_IFTYPE_STATION)
2793                 return RX_DROP_MONITOR;
2794
2795         switch (stype) {
2796         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2797         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2798         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2799                 /* process for all: mesh, mlme, ibss */
2800                 break;
2801         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2802         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2803         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2804         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2805                 if (is_multicast_ether_addr(mgmt->da) &&
2806                     !is_broadcast_ether_addr(mgmt->da))
2807                         return RX_DROP_MONITOR;
2808
2809                 /* process only for station */
2810                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2811                         return RX_DROP_MONITOR;
2812                 break;
2813         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2814                 /* process only for ibss and mesh */
2815                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2816                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2817                         return RX_DROP_MONITOR;
2818                 break;
2819         default:
2820                 return RX_DROP_MONITOR;
2821         }
2822
2823         /* queue up frame and kick off work to process it */
2824         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2825         skb_queue_tail(&sdata->skb_queue, rx->skb);
2826         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2827         if (rx->sta)
2828                 rx->sta->rx_packets++;
2829
2830         return RX_QUEUED;
2831 }
2832
2833 /* TODO: use IEEE80211_RX_FRAGMENTED */
2834 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2835                                         struct ieee80211_rate *rate)
2836 {
2837         struct ieee80211_sub_if_data *sdata;
2838         struct ieee80211_local *local = rx->local;
2839         struct sk_buff *skb = rx->skb, *skb2;
2840         struct net_device *prev_dev = NULL;
2841         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2842         int needed_headroom;
2843
2844         /*
2845          * If cooked monitor has been processed already, then
2846          * don't do it again. If not, set the flag.
2847          */
2848         if (rx->flags & IEEE80211_RX_CMNTR)
2849                 goto out_free_skb;
2850         rx->flags |= IEEE80211_RX_CMNTR;
2851
2852         /* If there are no cooked monitor interfaces, just free the SKB */
2853         if (!local->cooked_mntrs)
2854                 goto out_free_skb;
2855
2856         /* room for the radiotap header based on driver features */
2857         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2858
2859         if (skb_headroom(skb) < needed_headroom &&
2860             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2861                 goto out_free_skb;
2862
2863         /* prepend radiotap information */
2864         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2865                                          false);
2866
2867         skb_set_mac_header(skb, 0);
2868         skb->ip_summed = CHECKSUM_UNNECESSARY;
2869         skb->pkt_type = PACKET_OTHERHOST;
2870         skb->protocol = htons(ETH_P_802_2);
2871
2872         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2873                 if (!ieee80211_sdata_running(sdata))
2874                         continue;
2875
2876                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2877                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2878                         continue;
2879
2880                 if (prev_dev) {
2881                         skb2 = skb_clone(skb, GFP_ATOMIC);
2882                         if (skb2) {
2883                                 skb2->dev = prev_dev;
2884                                 netif_receive_skb(skb2);
2885                         }
2886                 }
2887
2888                 prev_dev = sdata->dev;
2889                 sdata->dev->stats.rx_packets++;
2890                 sdata->dev->stats.rx_bytes += skb->len;
2891         }
2892
2893         if (prev_dev) {
2894                 skb->dev = prev_dev;
2895                 netif_receive_skb(skb);
2896                 return;
2897         }
2898
2899  out_free_skb:
2900         dev_kfree_skb(skb);
2901 }
2902
2903 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2904                                          ieee80211_rx_result res)
2905 {
2906         switch (res) {
2907         case RX_DROP_MONITOR:
2908                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2909                 if (rx->sta)
2910                         rx->sta->rx_dropped++;
2911                 /* fall through */
2912         case RX_CONTINUE: {
2913                 struct ieee80211_rate *rate = NULL;
2914                 struct ieee80211_supported_band *sband;
2915                 struct ieee80211_rx_status *status;
2916
2917                 status = IEEE80211_SKB_RXCB((rx->skb));
2918
2919                 sband = rx->local->hw.wiphy->bands[status->band];
2920                 if (!(status->flag & RX_FLAG_HT) &&
2921                     !(status->flag & RX_FLAG_VHT))
2922                         rate = &sband->bitrates[status->rate_idx];
2923
2924                 ieee80211_rx_cooked_monitor(rx, rate);
2925                 break;
2926                 }
2927         case RX_DROP_UNUSABLE:
2928                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2929                 if (rx->sta)
2930                         rx->sta->rx_dropped++;
2931                 dev_kfree_skb(rx->skb);
2932                 break;
2933         case RX_QUEUED:
2934                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2935                 break;
2936         }
2937 }
2938
2939 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2940                                   struct sk_buff_head *frames)
2941 {
2942         ieee80211_rx_result res = RX_DROP_MONITOR;
2943         struct sk_buff *skb;
2944
2945 #define CALL_RXH(rxh)                   \
2946         do {                            \
2947                 res = rxh(rx);          \
2948                 if (res != RX_CONTINUE) \
2949                         goto rxh_next;  \
2950         } while (0);
2951
2952         spin_lock_bh(&rx->local->rx_path_lock);
2953
2954         while ((skb = __skb_dequeue(frames))) {
2955                 /*
2956                  * all the other fields are valid across frames
2957                  * that belong to an aMPDU since they are on the
2958                  * same TID from the same station
2959                  */
2960                 rx->skb = skb;
2961
2962                 CALL_RXH(ieee80211_rx_h_check_more_data)
2963                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2964                 CALL_RXH(ieee80211_rx_h_sta_process)
2965                 CALL_RXH(ieee80211_rx_h_decrypt)
2966                 CALL_RXH(ieee80211_rx_h_defragment)
2967                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2968                 /* must be after MMIC verify so header is counted in MPDU mic */
2969 #ifdef CONFIG_MAC80211_MESH
2970                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2971                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2972 #endif
2973                 CALL_RXH(ieee80211_rx_h_amsdu)
2974                 CALL_RXH(ieee80211_rx_h_data)
2975
2976                 /* special treatment -- needs the queue */
2977                 res = ieee80211_rx_h_ctrl(rx, frames);
2978                 if (res != RX_CONTINUE)
2979                         goto rxh_next;
2980
2981                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2982                 CALL_RXH(ieee80211_rx_h_action)
2983                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2984                 CALL_RXH(ieee80211_rx_h_action_return)
2985                 CALL_RXH(ieee80211_rx_h_mgmt)
2986
2987  rxh_next:
2988                 ieee80211_rx_handlers_result(rx, res);
2989
2990 #undef CALL_RXH
2991         }
2992
2993         spin_unlock_bh(&rx->local->rx_path_lock);
2994 }
2995
2996 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2997 {
2998         struct sk_buff_head reorder_release;
2999         ieee80211_rx_result res = RX_DROP_MONITOR;
3000
3001         __skb_queue_head_init(&reorder_release);
3002
3003 #define CALL_RXH(rxh)                   \
3004         do {                            \
3005                 res = rxh(rx);          \
3006                 if (res != RX_CONTINUE) \
3007                         goto rxh_next;  \
3008         } while (0);
3009
3010         CALL_RXH(ieee80211_rx_h_check)
3011
3012         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3013
3014         ieee80211_rx_handlers(rx, &reorder_release);
3015         return;
3016
3017  rxh_next:
3018         ieee80211_rx_handlers_result(rx, res);
3019
3020 #undef CALL_RXH
3021 }
3022
3023 /*
3024  * This function makes calls into the RX path, therefore
3025  * it has to be invoked under RCU read lock.
3026  */
3027 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3028 {
3029         struct sk_buff_head frames;
3030         struct ieee80211_rx_data rx = {
3031                 .sta = sta,
3032                 .sdata = sta->sdata,
3033                 .local = sta->local,
3034                 /* This is OK -- must be QoS data frame */
3035                 .security_idx = tid,
3036                 .seqno_idx = tid,
3037                 .flags = 0,
3038         };
3039         struct tid_ampdu_rx *tid_agg_rx;
3040
3041         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3042         if (!tid_agg_rx)
3043                 return;
3044
3045         __skb_queue_head_init(&frames);
3046
3047         spin_lock(&tid_agg_rx->reorder_lock);
3048         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3049         spin_unlock(&tid_agg_rx->reorder_lock);
3050
3051         ieee80211_rx_handlers(&rx, &frames);
3052 }
3053
3054 /* main receive path */
3055
3056 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3057                                 struct ieee80211_hdr *hdr)
3058 {
3059         struct ieee80211_sub_if_data *sdata = rx->sdata;
3060         struct sk_buff *skb = rx->skb;
3061         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3062         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3063         int multicast = is_multicast_ether_addr(hdr->addr1);
3064
3065         switch (sdata->vif.type) {
3066         case NL80211_IFTYPE_STATION:
3067                 if (!bssid && !sdata->u.mgd.use_4addr)
3068                         return 0;
3069                 if (!multicast &&
3070                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3071                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3072                             sdata->u.mgd.use_4addr)
3073                                 return 0;
3074                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3075                 }
3076                 break;
3077         case NL80211_IFTYPE_ADHOC:
3078                 if (!bssid)
3079                         return 0;
3080                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3081                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3082                         return 0;
3083                 if (ieee80211_is_beacon(hdr->frame_control)) {
3084                         return 1;
3085                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3086                         return 0;
3087                 } else if (!multicast &&
3088                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3089                         if (!(sdata->dev->flags & IFF_PROMISC))
3090                                 return 0;
3091                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3092                 } else if (!rx->sta) {
3093                         int rate_idx;
3094                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3095                                 rate_idx = 0; /* TODO: HT/VHT rates */
3096                         else
3097                                 rate_idx = status->rate_idx;
3098                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3099                                                  BIT(rate_idx));
3100                 }
3101                 break;
3102         case NL80211_IFTYPE_MESH_POINT:
3103                 if (!multicast &&
3104                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3105                         if (!(sdata->dev->flags & IFF_PROMISC))
3106                                 return 0;
3107
3108                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3109                 }
3110                 break;
3111         case NL80211_IFTYPE_AP_VLAN:
3112         case NL80211_IFTYPE_AP:
3113                 if (!bssid) {
3114                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3115                                 return 0;
3116                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3117                         /*
3118                          * Accept public action frames even when the
3119                          * BSSID doesn't match, this is used for P2P
3120                          * and location updates. Note that mac80211
3121                          * itself never looks at these frames.
3122                          */
3123                         if (!multicast &&
3124                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3125                                 return 0;
3126                         if (ieee80211_is_public_action(hdr, skb->len))
3127                                 return 1;
3128                         if (!ieee80211_is_beacon(hdr->frame_control))
3129                                 return 0;
3130                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3131                 }
3132                 break;
3133         case NL80211_IFTYPE_WDS:
3134                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3135                         return 0;
3136                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3137                         return 0;
3138                 break;
3139         case NL80211_IFTYPE_P2P_DEVICE:
3140                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3141                     !ieee80211_is_probe_req(hdr->frame_control) &&
3142                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3143                     !ieee80211_is_beacon(hdr->frame_control))
3144                         return 0;
3145                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3146                     !multicast)
3147                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3148                 break;
3149         default:
3150                 /* should never get here */
3151                 WARN_ON_ONCE(1);
3152                 break;
3153         }
3154
3155         return 1;
3156 }
3157
3158 /*
3159  * This function returns whether or not the SKB
3160  * was destined for RX processing or not, which,
3161  * if consume is true, is equivalent to whether
3162  * or not the skb was consumed.
3163  */
3164 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3165                                             struct sk_buff *skb, bool consume)
3166 {
3167         struct ieee80211_local *local = rx->local;
3168         struct ieee80211_sub_if_data *sdata = rx->sdata;
3169         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3170         struct ieee80211_hdr *hdr = (void *)skb->data;
3171         int prepares;
3172
3173         rx->skb = skb;
3174         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3175         prepares = prepare_for_handlers(rx, hdr);
3176
3177         if (!prepares)
3178                 return false;
3179
3180         if (!consume) {
3181                 skb = skb_copy(skb, GFP_ATOMIC);
3182                 if (!skb) {
3183                         if (net_ratelimit())
3184                                 wiphy_debug(local->hw.wiphy,
3185                                         "failed to copy skb for %s\n",
3186                                         sdata->name);
3187                         return true;
3188                 }
3189
3190                 rx->skb = skb;
3191         }
3192
3193         ieee80211_invoke_rx_handlers(rx);
3194         return true;
3195 }
3196
3197 /*
3198  * This is the actual Rx frames handler. as it blongs to Rx path it must
3199  * be called with rcu_read_lock protection.
3200  */
3201 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3202                                          struct sk_buff *skb)
3203 {
3204         struct ieee80211_local *local = hw_to_local(hw);
3205         struct ieee80211_sub_if_data *sdata;
3206         struct ieee80211_hdr *hdr;
3207         __le16 fc;
3208         struct ieee80211_rx_data rx;
3209         struct ieee80211_sub_if_data *prev;
3210         struct sta_info *sta, *tmp, *prev_sta;
3211         int err = 0;
3212
3213         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3214         memset(&rx, 0, sizeof(rx));
3215         rx.skb = skb;
3216         rx.local = local;
3217
3218         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3219                 local->dot11ReceivedFragmentCount++;
3220
3221         if (ieee80211_is_mgmt(fc)) {
3222                 /* drop frame if too short for header */
3223                 if (skb->len < ieee80211_hdrlen(fc))
3224                         err = -ENOBUFS;
3225                 else
3226                         err = skb_linearize(skb);
3227         } else {
3228                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3229         }
3230
3231         if (err) {
3232                 dev_kfree_skb(skb);
3233                 return;
3234         }
3235
3236         hdr = (struct ieee80211_hdr *)skb->data;
3237         ieee80211_parse_qos(&rx);
3238         ieee80211_verify_alignment(&rx);
3239
3240         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3241                      ieee80211_is_beacon(hdr->frame_control)))
3242                 ieee80211_scan_rx(local, skb);
3243
3244         if (ieee80211_is_data(fc)) {
3245                 prev_sta = NULL;
3246
3247                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3248                         if (!prev_sta) {
3249                                 prev_sta = sta;
3250                                 continue;
3251                         }
3252
3253                         rx.sta = prev_sta;
3254                         rx.sdata = prev_sta->sdata;
3255                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3256
3257                         prev_sta = sta;
3258                 }
3259
3260                 if (prev_sta) {
3261                         rx.sta = prev_sta;
3262                         rx.sdata = prev_sta->sdata;
3263
3264                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3265                                 return;
3266                         goto out;
3267                 }
3268         }
3269
3270         prev = NULL;
3271
3272         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3273                 if (!ieee80211_sdata_running(sdata))
3274                         continue;
3275
3276                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3277                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3278                         continue;
3279
3280                 /*
3281                  * frame is destined for this interface, but if it's
3282                  * not also for the previous one we handle that after
3283                  * the loop to avoid copying the SKB once too much
3284                  */
3285
3286                 if (!prev) {
3287                         prev = sdata;
3288                         continue;
3289                 }
3290
3291                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3292                 rx.sdata = prev;
3293                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3294
3295                 prev = sdata;
3296         }
3297
3298         if (prev) {
3299                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3300                 rx.sdata = prev;
3301
3302                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3303                         return;
3304         }
3305
3306  out:
3307         dev_kfree_skb(skb);
3308 }
3309
3310 /*
3311  * This is the receive path handler. It is called by a low level driver when an
3312  * 802.11 MPDU is received from the hardware.
3313  */
3314 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3315 {
3316         struct ieee80211_local *local = hw_to_local(hw);
3317         struct ieee80211_rate *rate = NULL;
3318         struct ieee80211_supported_band *sband;
3319         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3320
3321         WARN_ON_ONCE(softirq_count() == 0);
3322
3323         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3324                 goto drop;
3325
3326         sband = local->hw.wiphy->bands[status->band];
3327         if (WARN_ON(!sband))
3328                 goto drop;
3329
3330         /*
3331          * If we're suspending, it is possible although not too likely
3332          * that we'd be receiving frames after having already partially
3333          * quiesced the stack. We can't process such frames then since
3334          * that might, for example, cause stations to be added or other
3335          * driver callbacks be invoked.
3336          */
3337         if (unlikely(local->quiescing || local->suspended))
3338                 goto drop;
3339
3340         /* We might be during a HW reconfig, prevent Rx for the same reason */
3341         if (unlikely(local->in_reconfig))
3342                 goto drop;
3343
3344         /*
3345          * The same happens when we're not even started,
3346          * but that's worth a warning.
3347          */
3348         if (WARN_ON(!local->started))
3349                 goto drop;
3350
3351         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3352                 /*
3353                  * Validate the rate, unless a PLCP error means that
3354                  * we probably can't have a valid rate here anyway.
3355                  */
3356
3357                 if (status->flag & RX_FLAG_HT) {
3358                         /*
3359                          * rate_idx is MCS index, which can be [0-76]
3360                          * as documented on:
3361                          *
3362                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3363                          *
3364                          * Anything else would be some sort of driver or
3365                          * hardware error. The driver should catch hardware
3366                          * errors.
3367                          */
3368                         if (WARN(status->rate_idx > 76,
3369                                  "Rate marked as an HT rate but passed "
3370                                  "status->rate_idx is not "
3371                                  "an MCS index [0-76]: %d (0x%02x)\n",
3372                                  status->rate_idx,
3373                                  status->rate_idx))
3374                                 goto drop;
3375                 } else if (status->flag & RX_FLAG_VHT) {
3376                         if (WARN_ONCE(status->rate_idx > 9 ||
3377                                       !status->vht_nss ||
3378                                       status->vht_nss > 8,
3379                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3380                                       status->rate_idx, status->vht_nss))
3381                                 goto drop;
3382                 } else {
3383                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3384                                 goto drop;
3385                         rate = &sband->bitrates[status->rate_idx];
3386                 }
3387         }
3388
3389         status->rx_flags = 0;
3390
3391         /*
3392          * key references and virtual interfaces are protected using RCU
3393          * and this requires that we are in a read-side RCU section during
3394          * receive processing
3395          */
3396         rcu_read_lock();
3397
3398         /*
3399          * Frames with failed FCS/PLCP checksum are not returned,
3400          * all other frames are returned without radiotap header
3401          * if it was previously present.
3402          * Also, frames with less than 16 bytes are dropped.
3403          */
3404         skb = ieee80211_rx_monitor(local, skb, rate);
3405         if (!skb) {
3406                 rcu_read_unlock();
3407                 return;
3408         }
3409
3410         ieee80211_tpt_led_trig_rx(local,
3411                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3412                         skb->len);
3413         __ieee80211_rx_handle_packet(hw, skb);
3414
3415         rcu_read_unlock();
3416
3417         return;
3418  drop:
3419         kfree_skb(skb);
3420 }
3421 EXPORT_SYMBOL(ieee80211_rx);
3422
3423 /* This is a version of the rx handler that can be called from hard irq
3424  * context. Post the skb on the queue and schedule the tasklet */
3425 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3426 {
3427         struct ieee80211_local *local = hw_to_local(hw);
3428
3429         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3430
3431         skb->pkt_type = IEEE80211_RX_MSG;
3432         skb_queue_tail(&local->skb_queue, skb);
3433         tasklet_schedule(&local->tasklet);
3434 }
3435 EXPORT_SYMBOL(ieee80211_rx_irqsafe);