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                 goto dont_reorder;
 916
 917         /*
 918          * filter the QoS data rx stream according to
 919          * STA/TID and check if this STA/TID is on aggregation
 920          */
 921
 922         if (!sta)
 923                 goto dont_reorder;
 924
 925         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 926                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 927         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 928
 929         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 930         if (!tid_agg_rx)
 931                 goto dont_reorder;
 932
 933         /* qos null data frames are excluded */
 934         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 935                 goto dont_reorder;
 936
 937         /* not part of a BA session */
 938         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 939             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 940                 goto dont_reorder;
 941
 942         /* not actually part of this BA session */
 943         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 944                 goto dont_reorder;
 945
 946         /* new, potentially un-ordered, ampdu frame - process it */
 947
 948         /* reset session timer */
 949         if (tid_agg_rx->timeout)
 950                 tid_agg_rx->last_rx = jiffies;
 951
 952         /* if this mpdu is fragmented - terminate rx aggregation session */
 953         sc = le16_to_cpu(hdr->seq_ctrl);
 954         if (sc & IEEE80211_SCTL_FRAG) {
 955                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 956                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 957                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 958                 return;
 959         }
 960
 961         /*
 962          * No locking needed -- we will only ever process one
 963          * RX packet at a time, and thus own tid_agg_rx. All
 964          * other code manipulating it needs to (and does) make
 965          * sure that we cannot get to it any more before doing
 966          * anything with it.
 967          */
 968         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 969                                              frames))
 970                 return;
 971
 972  dont_reorder:
 973         __skb_queue_tail(frames, skb);
 974 }
 975
 976 static ieee80211_rx_result debug_noinline
 977 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 978 {
 979         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 980         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 981
 982         /*
 983          * Drop duplicate 802.11 retransmissions
 984          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 985          */
 986         if (rx->skb->len >= 24 && rx->sta &&
 987             !ieee80211_is_ctl(hdr->frame_control) &&
 988             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
 989             !is_multicast_ether_addr(hdr->addr1)) {
 990                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 991                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 992                              hdr->seq_ctrl)) {
 993                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 994                                 rx->local->dot11FrameDuplicateCount++;
 995                                 rx->sta->num_duplicates++;
 996                         }
 997                         return RX_DROP_UNUSABLE;
 998                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 999                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1000                 }
1001         }
1002
1003         if (unlikely(rx->skb->len < 16)) {
1004                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1005                 return RX_DROP_MONITOR;
1006         }
1007
1008         /* Drop disallowed frame classes based on STA auth/assoc state;
1009          * IEEE 802.11, Chap 5.5.
1010          *
1011          * mac80211 filters only based on association state, i.e. it drops
1012          * Class 3 frames from not associated stations. hostapd sends
1013          * deauth/disassoc frames when needed. In addition, hostapd is
1014          * responsible for filtering on both auth and assoc states.
1015          */
1016
1017         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1018                 return ieee80211_rx_mesh_check(rx);
1019
1020         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1021                       ieee80211_is_pspoll(hdr->frame_control)) &&
1022                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1023                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1024                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1025                 /*
1026                  * accept port control frames from the AP even when it's not
1027                  * yet marked ASSOC to prevent a race where we don't set the
1028                  * assoc bit quickly enough before it sends the first frame
1029                  */
1030                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1031                     ieee80211_is_data_present(hdr->frame_control)) {
1032                         unsigned int hdrlen;
1033                         __be16 ethertype;
1034
1035                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1036
1037                         if (rx->skb->len < hdrlen + 8)
1038                                 return RX_DROP_MONITOR;
1039
1040                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1041                         if (ethertype == rx->sdata->control_port_protocol)
1042                                 return RX_CONTINUE;
1043                 }
1044
1045                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1046                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1047                                                hdr->addr2,
1048                                                GFP_ATOMIC))
1049                         return RX_DROP_UNUSABLE;
1050
1051                 return RX_DROP_MONITOR;
1052         }
1053
1054         return RX_CONTINUE;
1055 }
1056
1057
1058 static ieee80211_rx_result debug_noinline
1059 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1060 {
1061         struct ieee80211_local *local;
1062         struct ieee80211_hdr *hdr;
1063         struct sk_buff *skb;
1064
1065         local = rx->local;
1066         skb = rx->skb;
1067         hdr = (struct ieee80211_hdr *) skb->data;
1068
1069         if (!local->pspolling)
1070                 return RX_CONTINUE;
1071
1072         if (!ieee80211_has_fromds(hdr->frame_control))
1073                 /* this is not from AP */
1074                 return RX_CONTINUE;
1075
1076         if (!ieee80211_is_data(hdr->frame_control))
1077                 return RX_CONTINUE;
1078
1079         if (!ieee80211_has_moredata(hdr->frame_control)) {
1080                 /* AP has no more frames buffered for us */
1081                 local->pspolling = false;
1082                 return RX_CONTINUE;
1083         }
1084
1085         /* more data bit is set, let's request a new frame from the AP */
1086         ieee80211_send_pspoll(local, rx->sdata);
1087
1088         return RX_CONTINUE;
1089 }
1090
1091 static void sta_ps_start(struct sta_info *sta)
1092 {
1093         struct ieee80211_sub_if_data *sdata = sta->sdata;
1094         struct ieee80211_local *local = sdata->local;
1095         struct ps_data *ps;
1096
1097         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1098             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1099                 ps = &sdata->bss->ps;
1100         else
1101                 return;
1102
1103         atomic_inc(&ps->num_sta_ps);
1104         set_sta_flag(sta, WLAN_STA_PS_STA);
1105         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1106                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1107         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1108                sta->sta.addr, sta->sta.aid);
1109 }
1110
1111 static void sta_ps_end(struct sta_info *sta)
1112 {
1113         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1114                sta->sta.addr, sta->sta.aid);
1115
1116         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1117                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1118                        sta->sta.addr, sta->sta.aid);
1119                 return;
1120         }
1121
1122         ieee80211_sta_ps_deliver_wakeup(sta);
1123 }
1124
1125 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1126 {
1127         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1128         bool in_ps;
1129
1130         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1131
1132         /* Don't let the same PS state be set twice */
1133         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1134         if ((start && in_ps) || (!start && !in_ps))
1135                 return -EINVAL;
1136
1137         if (start)
1138                 sta_ps_start(sta_inf);
1139         else
1140                 sta_ps_end(sta_inf);
1141
1142         return 0;
1143 }
1144 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1145
1146 static ieee80211_rx_result debug_noinline
1147 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1148 {
1149         struct ieee80211_sub_if_data *sdata = rx->sdata;
1150         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1151         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1152         int tid, ac;
1153
1154         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1155                 return RX_CONTINUE;
1156
1157         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1158             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1159                 return RX_CONTINUE;
1160
1161         /*
1162          * The device handles station powersave, so don't do anything about
1163          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1164          * it to mac80211 since they're handled.)
1165          */
1166         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1167                 return RX_CONTINUE;
1168
1169         /*
1170          * Don't do anything if the station isn't already asleep. In
1171          * the uAPSD case, the station will probably be marked asleep,
1172          * in the PS-Poll case the station must be confused ...
1173          */
1174         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1175                 return RX_CONTINUE;
1176
1177         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1178                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1179                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1180                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1181                         else
1182                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1183                 }
1184
1185                 /* Free PS Poll skb here instead of returning RX_DROP that would
1186                  * count as an dropped frame. */
1187                 dev_kfree_skb(rx->skb);
1188
1189                 return RX_QUEUED;
1190         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1191                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1192                    ieee80211_has_pm(hdr->frame_control) &&
1193                    (ieee80211_is_data_qos(hdr->frame_control) ||
1194                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1195                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1196                 ac = ieee802_1d_to_ac[tid & 7];
1197
1198                 /*
1199                  * If this AC is not trigger-enabled do nothing.
1200                  *
1201                  * NB: This could/should check a separate bitmap of trigger-
1202                  * enabled queues, but for now we only implement uAPSD w/o
1203                  * TSPEC changes to the ACs, so they're always the same.
1204                  */
1205                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1206                         return RX_CONTINUE;
1207
1208                 /* if we are in a service period, do nothing */
1209                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1210                         return RX_CONTINUE;
1211
1212                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1213                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1214                 else
1215                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1216         }
1217
1218         return RX_CONTINUE;
1219 }
1220
1221 static ieee80211_rx_result debug_noinline
1222 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1223 {
1224         struct sta_info *sta = rx->sta;
1225         struct sk_buff *skb = rx->skb;
1226         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1227         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1228         int i;
1229
1230         if (!sta)
1231                 return RX_CONTINUE;
1232
1233         /*
1234          * Update last_rx only for IBSS packets which are for the current
1235          * BSSID and for station already AUTHORIZED to avoid keeping the
1236          * current IBSS network alive in cases where other STAs start
1237          * using different BSSID. This will also give the station another
1238          * chance to restart the authentication/authorization in case
1239          * something went wrong the first time.
1240          */
1241         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1242                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1243                                                 NL80211_IFTYPE_ADHOC);
1244                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1245                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1246                         sta->last_rx = jiffies;
1247                         if (ieee80211_is_data(hdr->frame_control)) {
1248                                 sta->last_rx_rate_idx = status->rate_idx;
1249                                 sta->last_rx_rate_flag = status->flag;
1250                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1251                         }
1252                 }
1253         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1254                 /*
1255                  * Mesh beacons will update last_rx when if they are found to
1256                  * match the current local configuration when processed.
1257                  */
1258                 sta->last_rx = jiffies;
1259                 if (ieee80211_is_data(hdr->frame_control)) {
1260                         sta->last_rx_rate_idx = status->rate_idx;
1261                         sta->last_rx_rate_flag = status->flag;
1262                         sta->last_rx_rate_vht_nss = status->vht_nss;
1263                 }
1264         }
1265
1266         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1267                 return RX_CONTINUE;
1268
1269         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1270                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1271
1272         sta->rx_fragments++;
1273         sta->rx_bytes += rx->skb->len;
1274         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1275                 sta->last_signal = status->signal;
1276                 ewma_add(&sta->avg_signal, -status->signal);
1277         }
1278
1279         if (status->chains) {
1280                 sta->chains = status->chains;
1281                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1282                         int signal = status->chain_signal[i];
1283
1284                         if (!(status->chains & BIT(i)))
1285                                 continue;
1286
1287                         sta->chain_signal_last[i] = signal;
1288                         ewma_add(&sta->chain_signal_avg[i], -signal);
1289                 }
1290         }
1291
1292         /*
1293          * Change STA power saving mode only at the end of a frame
1294          * exchange sequence.
1295          */
1296         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1297             !ieee80211_has_morefrags(hdr->frame_control) &&
1298             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1299             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1300              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1301                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1302                         /*
1303                          * Ignore doze->wake transitions that are
1304                          * indicated by non-data frames, the standard
1305                          * is unclear here, but for example going to
1306                          * PS mode and then scanning would cause a
1307                          * doze->wake transition for the probe request,
1308                          * and that is clearly undesirable.
1309                          */
1310                         if (ieee80211_is_data(hdr->frame_control) &&
1311                             !ieee80211_has_pm(hdr->frame_control))
1312                                 sta_ps_end(sta);
1313                 } else {
1314                         if (ieee80211_has_pm(hdr->frame_control))
1315                                 sta_ps_start(sta);
1316                 }
1317         }
1318
1319         /* mesh power save support */
1320         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1321                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1322
1323         /*
1324          * Drop (qos-)data::nullfunc frames silently, since they
1325          * are used only to control station power saving mode.
1326          */
1327         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1328             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1329                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1330
1331                 /*
1332                  * If we receive a 4-addr nullfunc frame from a STA
1333                  * that was not moved to a 4-addr STA vlan yet send
1334                  * the event to userspace and for older hostapd drop
1335                  * the frame to the monitor interface.
1336                  */
1337                 if (ieee80211_has_a4(hdr->frame_control) &&
1338                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1339                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1340                       !rx->sdata->u.vlan.sta))) {
1341                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1342                                 cfg80211_rx_unexpected_4addr_frame(
1343                                         rx->sdata->dev, sta->sta.addr,
1344                                         GFP_ATOMIC);
1345                         return RX_DROP_MONITOR;
1346                 }
1347                 /*
1348                  * Update counter and free packet here to avoid
1349                  * counting this as a dropped packed.
1350                  */
1351                 sta->rx_packets++;
1352                 dev_kfree_skb(rx->skb);
1353                 return RX_QUEUED;
1354         }
1355
1356         return RX_CONTINUE;
1357 } /* ieee80211_rx_h_sta_process */
1358
1359 static ieee80211_rx_result debug_noinline
1360 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1361 {
1362         struct sk_buff *skb = rx->skb;
1363         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1364         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1365         int keyidx;
1366         int hdrlen;
1367         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1368         struct ieee80211_key *sta_ptk = NULL;
1369         int mmie_keyidx = -1;
1370         __le16 fc;
1371
1372         /*
1373          * Key selection 101
1374          *
1375          * There are four types of keys:
1376          *  - GTK (group keys)
1377          *  - IGTK (group keys for management frames)
1378          *  - PTK (pairwise keys)
1379          *  - STK (station-to-station pairwise keys)
1380          *
1381          * When selecting a key, we have to distinguish between multicast
1382          * (including broadcast) and unicast frames, the latter can only
1383          * use PTKs and STKs while the former always use GTKs and IGTKs.
1384          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1385          * unicast frames can also use key indices like GTKs. Hence, if we
1386          * don't have a PTK/STK we check the key index for a WEP key.
1387          *
1388          * Note that in a regular BSS, multicast frames are sent by the
1389          * AP only, associated stations unicast the frame to the AP first
1390          * which then multicasts it on their behalf.
1391          *
1392          * There is also a slight problem in IBSS mode: GTKs are negotiated
1393          * with each station, that is something we don't currently handle.
1394          * The spec seems to expect that one negotiates the same key with
1395          * every station but there's no such requirement; VLANs could be
1396          * possible.
1397          */
1398
1399         /*
1400          * No point in finding a key and decrypting if the frame is neither
1401          * addressed to us nor a multicast frame.
1402          */
1403         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1404                 return RX_CONTINUE;
1405
1406         /* start without a key */
1407         rx->key = NULL;
1408
1409         if (rx->sta)
1410                 sta_ptk = rcu_dereference(rx->sta->ptk);
1411
1412         fc = hdr->frame_control;
1413
1414         if (!ieee80211_has_protected(fc))
1415                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1416
1417         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1418                 rx->key = sta_ptk;
1419                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1420                     (status->flag & RX_FLAG_IV_STRIPPED))
1421                         return RX_CONTINUE;
1422                 /* Skip decryption if the frame is not protected. */
1423                 if (!ieee80211_has_protected(fc))
1424                         return RX_CONTINUE;
1425         } else if (mmie_keyidx >= 0) {
1426                 /* Broadcast/multicast robust management frame / BIP */
1427                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1428                     (status->flag & RX_FLAG_IV_STRIPPED))
1429                         return RX_CONTINUE;
1430
1431                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1432                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1433                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1434                 if (rx->sta)
1435                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1436                 if (!rx->key)
1437                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1438         } else if (!ieee80211_has_protected(fc)) {
1439                 /*
1440                  * The frame was not protected, so skip decryption. However, we
1441                  * need to set rx->key if there is a key that could have been
1442                  * used so that the frame may be dropped if encryption would
1443                  * have been expected.
1444                  */
1445                 struct ieee80211_key *key = NULL;
1446                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1447                 int i;
1448
1449                 if (ieee80211_is_mgmt(fc) &&
1450                     is_multicast_ether_addr(hdr->addr1) &&
1451                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1452                         rx->key = key;
1453                 else {
1454                         if (rx->sta) {
1455                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1456                                         key = rcu_dereference(rx->sta->gtk[i]);
1457                                         if (key)
1458                                                 break;
1459                                 }
1460                         }
1461                         if (!key) {
1462                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1463                                         key = rcu_dereference(sdata->keys[i]);
1464                                         if (key)
1465                                                 break;
1466                                 }
1467                         }
1468                         if (key)
1469                                 rx->key = key;
1470                 }
1471                 return RX_CONTINUE;
1472         } else {
1473                 u8 keyid;
1474                 /*
1475                  * The device doesn't give us the IV so we won't be
1476                  * able to look up the key. That's ok though, we
1477                  * don't need to decrypt the frame, we just won't
1478                  * be able to keep statistics accurate.
1479                  * Except for key threshold notifications, should
1480                  * we somehow allow the driver to tell us which key
1481                  * the hardware used if this flag is set?
1482                  */
1483                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1484                     (status->flag & RX_FLAG_IV_STRIPPED))
1485                         return RX_CONTINUE;
1486
1487                 hdrlen = ieee80211_hdrlen(fc);
1488
1489                 if (rx->skb->len < 8 + hdrlen)
1490                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1491
1492                 /*
1493                  * no need to call ieee80211_wep_get_keyidx,
1494                  * it verifies a bunch of things we've done already
1495                  */
1496                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1497                 keyidx = keyid >> 6;
1498
1499                 /* check per-station GTK first, if multicast packet */
1500                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1501                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1502
1503                 /* if not found, try default key */
1504                 if (!rx->key) {
1505                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1506
1507                         /*
1508                          * RSNA-protected unicast frames should always be
1509                          * sent with pairwise or station-to-station keys,
1510                          * but for WEP we allow using a key index as well.
1511                          */
1512                         if (rx->key &&
1513                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1514                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1515                             !is_multicast_ether_addr(hdr->addr1))
1516                                 rx->key = NULL;
1517                 }
1518         }
1519
1520         if (rx->key) {
1521                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1522                         return RX_DROP_MONITOR;
1523
1524                 rx->key->tx_rx_count++;
1525                 /* TODO: add threshold stuff again */
1526         } else {
1527                 return RX_DROP_MONITOR;
1528         }
1529
1530         switch (rx->key->conf.cipher) {
1531         case WLAN_CIPHER_SUITE_WEP40:
1532         case WLAN_CIPHER_SUITE_WEP104:
1533                 result = ieee80211_crypto_wep_decrypt(rx);
1534                 break;
1535         case WLAN_CIPHER_SUITE_TKIP:
1536                 result = ieee80211_crypto_tkip_decrypt(rx);
1537                 break;
1538         case WLAN_CIPHER_SUITE_CCMP:
1539                 result = ieee80211_crypto_ccmp_decrypt(rx);
1540                 break;
1541         case WLAN_CIPHER_SUITE_AES_CMAC:
1542                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1543                 break;
1544         default:
1545                 /*
1546                  * We can reach here only with HW-only algorithms
1547                  * but why didn't it decrypt the frame?!
1548                  */
1549                 return RX_DROP_UNUSABLE;
1550         }
1551
1552         /* the hdr variable is invalid after the decrypt handlers */
1553
1554         /* either the frame has been decrypted or will be dropped */
1555         status->flag |= RX_FLAG_DECRYPTED;
1556
1557         return result;
1558 }
1559
1560 static inline struct ieee80211_fragment_entry *
1561 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1562                          unsigned int frag, unsigned int seq, int rx_queue,
1563                          struct sk_buff **skb)
1564 {
1565         struct ieee80211_fragment_entry *entry;
1566
1567         entry = &sdata->fragments[sdata->fragment_next++];
1568         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1569                 sdata->fragment_next = 0;
1570
1571         if (!skb_queue_empty(&entry->skb_list))
1572                 __skb_queue_purge(&entry->skb_list);
1573
1574         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1575         *skb = NULL;
1576         entry->first_frag_time = jiffies;
1577         entry->seq = seq;
1578         entry->rx_queue = rx_queue;
1579         entry->last_frag = frag;
1580         entry->ccmp = 0;
1581         entry->extra_len = 0;
1582
1583         return entry;
1584 }
1585
1586 static inline struct ieee80211_fragment_entry *
1587 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1588                           unsigned int frag, unsigned int seq,
1589                           int rx_queue, struct ieee80211_hdr *hdr)
1590 {
1591         struct ieee80211_fragment_entry *entry;
1592         int i, idx;
1593
1594         idx = sdata->fragment_next;
1595         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1596                 struct ieee80211_hdr *f_hdr;
1597
1598                 idx--;
1599                 if (idx < 0)
1600                         idx = IEEE80211_FRAGMENT_MAX - 1;
1601
1602                 entry = &sdata->fragments[idx];
1603                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1604                     entry->rx_queue != rx_queue ||
1605                     entry->last_frag + 1 != frag)
1606                         continue;
1607
1608                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1609
1610                 /*
1611                  * Check ftype and addresses are equal, else check next fragment
1612                  */
1613                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1614                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1615                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1616                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1617                         continue;
1618
1619                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1620                         __skb_queue_purge(&entry->skb_list);
1621                         continue;
1622                 }
1623                 return entry;
1624         }
1625
1626         return NULL;
1627 }
1628
1629 static ieee80211_rx_result debug_noinline
1630 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1631 {
1632         struct ieee80211_hdr *hdr;
1633         u16 sc;
1634         __le16 fc;
1635         unsigned int frag, seq;
1636         struct ieee80211_fragment_entry *entry;
1637         struct sk_buff *skb;
1638         struct ieee80211_rx_status *status;
1639
1640         hdr = (struct ieee80211_hdr *)rx->skb->data;
1641         fc = hdr->frame_control;
1642
1643         if (ieee80211_is_ctl(fc))
1644                 return RX_CONTINUE;
1645
1646         sc = le16_to_cpu(hdr->seq_ctrl);
1647         frag = sc & IEEE80211_SCTL_FRAG;
1648
1649         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1650                    is_multicast_ether_addr(hdr->addr1))) {
1651                 /* not fragmented */
1652                 goto out;
1653         }
1654         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1655
1656         if (skb_linearize(rx->skb))
1657                 return RX_DROP_UNUSABLE;
1658
1659         /*
1660          *  skb_linearize() might change the skb->data and
1661          *  previously cached variables (in this case, hdr) need to
1662          *  be refreshed with the new data.
1663          */
1664         hdr = (struct ieee80211_hdr *)rx->skb->data;
1665         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1666
1667         if (frag == 0) {
1668                 /* This is the first fragment of a new frame. */
1669                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1670                                                  rx->seqno_idx, &(rx->skb));
1671                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1672                     ieee80211_has_protected(fc)) {
1673                         int queue = rx->security_idx;
1674                         /* Store CCMP PN so that we can verify that the next
1675                          * fragment has a sequential PN value. */
1676                         entry->ccmp = 1;
1677                         memcpy(entry->last_pn,
1678                                rx->key->u.ccmp.rx_pn[queue],
1679                                IEEE80211_CCMP_PN_LEN);
1680                 }
1681                 return RX_QUEUED;
1682         }
1683
1684         /* This is a fragment for a frame that should already be pending in
1685          * fragment cache. Add this fragment to the end of the pending entry.
1686          */
1687         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1688                                           rx->seqno_idx, hdr);
1689         if (!entry) {
1690                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1691                 return RX_DROP_MONITOR;
1692         }
1693
1694         /* Verify that MPDUs within one MSDU have sequential PN values.
1695          * (IEEE 802.11i, 8.3.3.4.5) */
1696         if (entry->ccmp) {
1697                 int i;
1698                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1699                 int queue;
1700                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1701                         return RX_DROP_UNUSABLE;
1702                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1703                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1704                         pn[i]++;
1705                         if (pn[i])
1706                                 break;
1707                 }
1708                 queue = rx->security_idx;
1709                 rpn = rx->key->u.ccmp.rx_pn[queue];
1710                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1711                         return RX_DROP_UNUSABLE;
1712                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1713         }
1714
1715         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1716         __skb_queue_tail(&entry->skb_list, rx->skb);
1717         entry->last_frag = frag;
1718         entry->extra_len += rx->skb->len;
1719         if (ieee80211_has_morefrags(fc)) {
1720                 rx->skb = NULL;
1721                 return RX_QUEUED;
1722         }
1723
1724         rx->skb = __skb_dequeue(&entry->skb_list);
1725         if (skb_tailroom(rx->skb) < entry->extra_len) {
1726                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1727                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1728                                               GFP_ATOMIC))) {
1729                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1730                         __skb_queue_purge(&entry->skb_list);
1731                         return RX_DROP_UNUSABLE;
1732                 }
1733         }
1734         while ((skb = __skb_dequeue(&entry->skb_list))) {
1735                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1736                 dev_kfree_skb(skb);
1737         }
1738
1739         /* Complete frame has been reassembled - process it now */
1740         status = IEEE80211_SKB_RXCB(rx->skb);
1741         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1742
1743  out:
1744         if (rx->sta)
1745                 rx->sta->rx_packets++;
1746         if (is_multicast_ether_addr(hdr->addr1))
1747                 rx->local->dot11MulticastReceivedFrameCount++;
1748         else
1749                 ieee80211_led_rx(rx->local);
1750         return RX_CONTINUE;
1751 }
1752
1753 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1754 {
1755         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1756                 return -EACCES;
1757
1758         return 0;
1759 }
1760
1761 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1762 {
1763         struct sk_buff *skb = rx->skb;
1764         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1765
1766         /*
1767          * Pass through unencrypted frames if the hardware has
1768          * decrypted them already.
1769          */
1770         if (status->flag & RX_FLAG_DECRYPTED)
1771                 return 0;
1772
1773         /* Drop unencrypted frames if key is set. */
1774         if (unlikely(!ieee80211_has_protected(fc) &&
1775                      !ieee80211_is_nullfunc(fc) &&
1776                      ieee80211_is_data(fc) &&
1777                      (rx->key || rx->sdata->drop_unencrypted)))
1778                 return -EACCES;
1779
1780         return 0;
1781 }
1782
1783 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1784 {
1785         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1786         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1787         __le16 fc = hdr->frame_control;
1788
1789         /*
1790          * Pass through unencrypted frames if the hardware has
1791          * decrypted them already.
1792          */
1793         if (status->flag & RX_FLAG_DECRYPTED)
1794                 return 0;
1795
1796         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1797                 if (unlikely(!ieee80211_has_protected(fc) &&
1798                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1799                              rx->key)) {
1800                         if (ieee80211_is_deauth(fc) ||
1801                             ieee80211_is_disassoc(fc))
1802                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1803                                                              rx->skb->data,
1804                                                              rx->skb->len);
1805                         return -EACCES;
1806                 }
1807                 /* BIP does not use Protected field, so need to check MMIE */
1808                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1809                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1810                         if (ieee80211_is_deauth(fc) ||
1811                             ieee80211_is_disassoc(fc))
1812                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1813                                                              rx->skb->data,
1814                                                              rx->skb->len);
1815                         return -EACCES;
1816                 }
1817                 /*
1818                  * When using MFP, Action frames are not allowed prior to
1819                  * having configured keys.
1820                  */
1821                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1822                              ieee80211_is_robust_mgmt_frame(
1823                                      (struct ieee80211_hdr *) rx->skb->data)))
1824                         return -EACCES;
1825         }
1826
1827         return 0;
1828 }
1829
1830 static int
1831 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1832 {
1833         struct ieee80211_sub_if_data *sdata = rx->sdata;
1834         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1835         bool check_port_control = false;
1836         struct ethhdr *ehdr;
1837         int ret;
1838
1839         *port_control = false;
1840         if (ieee80211_has_a4(hdr->frame_control) &&
1841             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1842                 return -1;
1843
1844         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1845             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1846
1847                 if (!sdata->u.mgd.use_4addr)
1848                         return -1;
1849                 else
1850                         check_port_control = true;
1851         }
1852
1853         if (is_multicast_ether_addr(hdr->addr1) &&
1854             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1855                 return -1;
1856
1857         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1858         if (ret < 0)
1859                 return ret;
1860
1861         ehdr = (struct ethhdr *) rx->skb->data;
1862         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1863                 *port_control = true;
1864         else if (check_port_control)
1865                 return -1;
1866
1867         return 0;
1868 }
1869
1870 /*
1871  * requires that rx->skb is a frame with ethernet header
1872  */
1873 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1874 {
1875         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1876                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1877         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1878
1879         /*
1880          * Allow EAPOL frames to us/the PAE group address regardless
1881          * of whether the frame was encrypted or not.
1882          */
1883         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1884             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1885              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1886                 return true;
1887
1888         if (ieee80211_802_1x_port_control(rx) ||
1889             ieee80211_drop_unencrypted(rx, fc))
1890                 return false;
1891
1892         return true;
1893 }
1894
1895 /*
1896  * requires that rx->skb is a frame with ethernet header
1897  */
1898 static void
1899 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1900 {
1901         struct ieee80211_sub_if_data *sdata = rx->sdata;
1902         struct net_device *dev = sdata->dev;
1903         struct sk_buff *skb, *xmit_skb;
1904         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1905         struct sta_info *dsta;
1906         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1907
1908         skb = rx->skb;
1909         xmit_skb = NULL;
1910
1911         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1912              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1913             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1914             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1915             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1916                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1917                         /*
1918                          * send multicast frames both to higher layers in
1919                          * local net stack and back to the wireless medium
1920                          */
1921                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1922                         if (!xmit_skb)
1923                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1924                                                     dev->name);
1925                 } else {
1926                         dsta = sta_info_get(sdata, skb->data);
1927                         if (dsta) {
1928                                 /*
1929                                  * The destination station is associated to
1930                                  * this AP (in this VLAN), so send the frame
1931                                  * directly to it and do not pass it to local
1932                                  * net stack.
1933                                  */
1934                                 xmit_skb = skb;
1935                                 skb = NULL;
1936                         }
1937                 }
1938         }
1939
1940         if (skb) {
1941                 int align __maybe_unused;
1942
1943 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1944                 /*
1945                  * 'align' will only take the values 0 or 2 here
1946                  * since all frames are required to be aligned
1947                  * to 2-byte boundaries when being passed to
1948                  * mac80211; the code here works just as well if
1949                  * that isn't true, but mac80211 assumes it can
1950                  * access fields as 2-byte aligned (e.g. for
1951                  * compare_ether_addr)
1952                  */
1953                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1954                 if (align) {
1955                         if (WARN_ON(skb_headroom(skb) < 3)) {
1956                                 dev_kfree_skb(skb);
1957                                 skb = NULL;
1958                         } else {
1959                                 u8 *data = skb->data;
1960                                 size_t len = skb_headlen(skb);
1961                                 skb->data -= align;
1962                                 memmove(skb->data, data, len);
1963                                 skb_set_tail_pointer(skb, len);
1964                         }
1965                 }
1966 #endif
1967
1968                 if (skb) {
1969                         /* deliver to local stack */
1970                         skb->protocol = eth_type_trans(skb, dev);
1971                         memset(skb->cb, 0, sizeof(skb->cb));
1972                         netif_receive_skb(skb);
1973                 }
1974         }
1975
1976         if (xmit_skb) {
1977                 /*
1978                  * Send to wireless media and increase priority by 256 to
1979                  * keep the received priority instead of reclassifying
1980                  * the frame (see cfg80211_classify8021d).
1981                  */
1982                 xmit_skb->priority += 256;
1983                 xmit_skb->protocol = htons(ETH_P_802_3);
1984                 skb_reset_network_header(xmit_skb);
1985                 skb_reset_mac_header(xmit_skb);
1986                 dev_queue_xmit(xmit_skb);
1987         }
1988 }
1989
1990 static ieee80211_rx_result debug_noinline
1991 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1992 {
1993         struct net_device *dev = rx->sdata->dev;
1994         struct sk_buff *skb = rx->skb;
1995         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1996         __le16 fc = hdr->frame_control;
1997         struct sk_buff_head frame_list;
1998         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1999
2000         if (unlikely(!ieee80211_is_data(fc)))
2001                 return RX_CONTINUE;
2002
2003         if (unlikely(!ieee80211_is_data_present(fc)))
2004                 return RX_DROP_MONITOR;
2005
2006         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2007                 return RX_CONTINUE;
2008
2009         if (ieee80211_has_a4(hdr->frame_control) &&
2010             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2011             !rx->sdata->u.vlan.sta)
2012                 return RX_DROP_UNUSABLE;
2013
2014         if (is_multicast_ether_addr(hdr->addr1) &&
2015             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2016               rx->sdata->u.vlan.sta) ||
2017              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2018               rx->sdata->u.mgd.use_4addr)))
2019                 return RX_DROP_UNUSABLE;
2020
2021         skb->dev = dev;
2022         __skb_queue_head_init(&frame_list);
2023
2024         if (skb_linearize(skb))
2025                 return RX_DROP_UNUSABLE;
2026
2027         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2028                                  rx->sdata->vif.type,
2029                                  rx->local->hw.extra_tx_headroom, true);
2030
2031         while (!skb_queue_empty(&frame_list)) {
2032                 rx->skb = __skb_dequeue(&frame_list);
2033
2034                 if (!ieee80211_frame_allowed(rx, fc)) {
2035                         dev_kfree_skb(rx->skb);
2036                         continue;
2037                 }
2038                 dev->stats.rx_packets++;
2039                 dev->stats.rx_bytes += rx->skb->len;
2040
2041                 ieee80211_deliver_skb(rx);
2042         }
2043
2044         return RX_QUEUED;
2045 }
2046
2047 #ifdef CONFIG_MAC80211_MESH
2048 static ieee80211_rx_result
2049 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2050 {
2051         struct ieee80211_hdr *fwd_hdr, *hdr;
2052         struct ieee80211_tx_info *info;
2053         struct ieee80211s_hdr *mesh_hdr;
2054         struct sk_buff *skb = rx->skb, *fwd_skb;
2055         struct ieee80211_local *local = rx->local;
2056         struct ieee80211_sub_if_data *sdata = rx->sdata;
2057         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2058         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2059         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2060         u16 q, hdrlen;
2061
2062         hdr = (struct ieee80211_hdr *) skb->data;
2063         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2064
2065         /* make sure fixed part of mesh header is there, also checks skb len */
2066         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2067                 return RX_DROP_MONITOR;
2068
2069         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2070
2071         /* make sure full mesh header is there, also checks skb len */
2072         if (!pskb_may_pull(rx->skb,
2073                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2074                 return RX_DROP_MONITOR;
2075
2076         /* reload pointers */
2077         hdr = (struct ieee80211_hdr *) skb->data;
2078         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2079
2080         /* frame is in RMC, don't forward */
2081         if (ieee80211_is_data(hdr->frame_control) &&
2082             is_multicast_ether_addr(hdr->addr1) &&
2083             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2084                 return RX_DROP_MONITOR;
2085
2086         if (!ieee80211_is_data(hdr->frame_control) ||
2087             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2088                 return RX_CONTINUE;
2089
2090         if (!mesh_hdr->ttl)
2091                 return RX_DROP_MONITOR;
2092
2093         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2094                 struct mesh_path *mppath;
2095                 char *proxied_addr;
2096                 char *mpp_addr;
2097
2098                 if (is_multicast_ether_addr(hdr->addr1)) {
2099                         mpp_addr = hdr->addr3;
2100                         proxied_addr = mesh_hdr->eaddr1;
2101                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2102                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2103                         mpp_addr = hdr->addr4;
2104                         proxied_addr = mesh_hdr->eaddr2;
2105                 } else {
2106                         return RX_DROP_MONITOR;
2107                 }
2108
2109                 rcu_read_lock();
2110                 mppath = mpp_path_lookup(sdata, proxied_addr);
2111                 if (!mppath) {
2112                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2113                 } else {
2114                         spin_lock_bh(&mppath->state_lock);
2115                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2116                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2117                         spin_unlock_bh(&mppath->state_lock);
2118                 }
2119                 rcu_read_unlock();
2120         }
2121
2122         /* Frame has reached destination.  Don't forward */
2123         if (!is_multicast_ether_addr(hdr->addr1) &&
2124             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2125                 return RX_CONTINUE;
2126
2127         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2128         if (ieee80211_queue_stopped(&local->hw, q)) {
2129                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2130                 return RX_DROP_MONITOR;
2131         }
2132         skb_set_queue_mapping(skb, q);
2133
2134         if (!--mesh_hdr->ttl) {
2135                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2136                 goto out;
2137         }
2138
2139         if (!ifmsh->mshcfg.dot11MeshForwarding)
2140                 goto out;
2141
2142         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2143         if (!fwd_skb) {
2144                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2145                                     sdata->name);
2146                 goto out;
2147         }
2148
2149         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2150         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2151         info = IEEE80211_SKB_CB(fwd_skb);
2152         memset(info, 0, sizeof(*info));
2153         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2154         info->control.vif = &rx->sdata->vif;
2155         info->control.jiffies = jiffies;
2156         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2157                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2158                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2159                 /* update power mode indication when forwarding */
2160                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2161         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2162                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2163                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2164         } else {
2165                 /* unable to resolve next hop */
2166                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2167                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2168                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2169                 kfree_skb(fwd_skb);
2170                 return RX_DROP_MONITOR;
2171         }
2172
2173         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2174         ieee80211_add_pending_skb(local, fwd_skb);
2175  out:
2176         if (is_multicast_ether_addr(hdr->addr1) ||
2177             sdata->dev->flags & IFF_PROMISC)
2178                 return RX_CONTINUE;
2179         else
2180                 return RX_DROP_MONITOR;
2181 }
2182 #endif
2183
2184 static ieee80211_rx_result debug_noinline
2185 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2186 {
2187         struct ieee80211_sub_if_data *sdata = rx->sdata;
2188         struct ieee80211_local *local = rx->local;
2189         struct net_device *dev = sdata->dev;
2190         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2191         __le16 fc = hdr->frame_control;
2192         bool port_control;
2193         int err;
2194
2195         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2196                 return RX_CONTINUE;
2197
2198         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2199                 return RX_DROP_MONITOR;
2200
2201         /*
2202          * Send unexpected-4addr-frame event to hostapd. For older versions,
2203          * also drop the frame to cooked monitor interfaces.
2204          */
2205         if (ieee80211_has_a4(hdr->frame_control) &&
2206             sdata->vif.type == NL80211_IFTYPE_AP) {
2207                 if (rx->sta &&
2208                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2209                         cfg80211_rx_unexpected_4addr_frame(
2210                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2211                 return RX_DROP_MONITOR;
2212         }
2213
2214         err = __ieee80211_data_to_8023(rx, &port_control);
2215         if (unlikely(err))
2216                 return RX_DROP_UNUSABLE;
2217
2218         if (!ieee80211_frame_allowed(rx, fc))
2219                 return RX_DROP_MONITOR;
2220
2221         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2222             unlikely(port_control) && sdata->bss) {
2223                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2224                                      u.ap);
2225                 dev = sdata->dev;
2226                 rx->sdata = sdata;
2227         }
2228
2229         rx->skb->dev = dev;
2230
2231         dev->stats.rx_packets++;
2232         dev->stats.rx_bytes += rx->skb->len;
2233
2234         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2235             !is_multicast_ether_addr(
2236                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2237             (!local->scanning &&
2238              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2239                         mod_timer(&local->dynamic_ps_timer, jiffies +
2240                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2241         }
2242
2243         ieee80211_deliver_skb(rx);
2244
2245         return RX_QUEUED;
2246 }
2247
2248 static ieee80211_rx_result debug_noinline
2249 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2250 {
2251         struct sk_buff *skb = rx->skb;
2252         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2253         struct tid_ampdu_rx *tid_agg_rx;
2254         u16 start_seq_num;
2255         u16 tid;
2256
2257         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2258                 return RX_CONTINUE;
2259
2260         if (ieee80211_is_back_req(bar->frame_control)) {
2261                 struct {
2262                         __le16 control, start_seq_num;
2263                 } __packed bar_data;
2264
2265                 if (!rx->sta)
2266                         return RX_DROP_MONITOR;
2267
2268                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2269                                   &bar_data, sizeof(bar_data)))
2270                         return RX_DROP_MONITOR;
2271
2272                 tid = le16_to_cpu(bar_data.control) >> 12;
2273
2274                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2275                 if (!tid_agg_rx)
2276                         return RX_DROP_MONITOR;
2277
2278                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2279
2280                 /* reset session timer */
2281                 if (tid_agg_rx->timeout)
2282                         mod_timer(&tid_agg_rx->session_timer,
2283                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2284
2285                 spin_lock(&tid_agg_rx->reorder_lock);
2286                 /* release stored frames up to start of BAR */
2287                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2288                                                  start_seq_num, frames);
2289                 spin_unlock(&tid_agg_rx->reorder_lock);
2290
2291                 kfree_skb(skb);
2292                 return RX_QUEUED;
2293         }
2294
2295         /*
2296          * After this point, we only want management frames,
2297          * so we can drop all remaining control frames to
2298          * cooked monitor interfaces.
2299          */
2300         return RX_DROP_MONITOR;
2301 }
2302
2303 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2304                                            struct ieee80211_mgmt *mgmt,
2305                                            size_t len)
2306 {
2307         struct ieee80211_local *local = sdata->local;
2308         struct sk_buff *skb;
2309         struct ieee80211_mgmt *resp;
2310
2311         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2312                 /* Not to own unicast address */
2313                 return;
2314         }
2315
2316         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2317             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2318                 /* Not from the current AP or not associated yet. */
2319                 return;
2320         }
2321
2322         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2323                 /* Too short SA Query request frame */
2324                 return;
2325         }
2326
2327         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2328         if (skb == NULL)
2329                 return;
2330
2331         skb_reserve(skb, local->hw.extra_tx_headroom);
2332         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2333         memset(resp, 0, 24);
2334         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2335         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2336         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2337         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2338                                           IEEE80211_STYPE_ACTION);
2339         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2340         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2341         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2342         memcpy(resp->u.action.u.sa_query.trans_id,
2343                mgmt->u.action.u.sa_query.trans_id,
2344                WLAN_SA_QUERY_TR_ID_LEN);
2345
2346         ieee80211_tx_skb(sdata, skb);
2347 }
2348
2349 static ieee80211_rx_result debug_noinline
2350 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2351 {
2352         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2353         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2354
2355         /*
2356          * From here on, look only at management frames.
2357          * Data and control frames are already handled,
2358          * and unknown (reserved) frames are useless.
2359          */
2360         if (rx->skb->len < 24)
2361                 return RX_DROP_MONITOR;
2362
2363         if (!ieee80211_is_mgmt(mgmt->frame_control))
2364                 return RX_DROP_MONITOR;
2365
2366         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2367             ieee80211_is_beacon(mgmt->frame_control) &&
2368             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2369                 int sig = 0;
2370
2371                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2372                         sig = status->signal;
2373
2374                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2375                                             rx->skb->data, rx->skb->len,
2376                                             status->freq, sig);
2377                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2378         }
2379
2380         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2381                 return RX_DROP_MONITOR;
2382
2383         if (ieee80211_drop_unencrypted_mgmt(rx))
2384                 return RX_DROP_UNUSABLE;
2385
2386         return RX_CONTINUE;
2387 }
2388
2389 static ieee80211_rx_result debug_noinline
2390 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2391 {
2392         struct ieee80211_local *local = rx->local;
2393         struct ieee80211_sub_if_data *sdata = rx->sdata;
2394         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2395         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2396         int len = rx->skb->len;
2397
2398         if (!ieee80211_is_action(mgmt->frame_control))
2399                 return RX_CONTINUE;
2400
2401         /* drop too small frames */
2402         if (len < IEEE80211_MIN_ACTION_SIZE)
2403                 return RX_DROP_UNUSABLE;
2404
2405         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2406             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2407             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2408                 return RX_DROP_UNUSABLE;
2409
2410         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2411                 return RX_DROP_UNUSABLE;
2412
2413         switch (mgmt->u.action.category) {
2414         case WLAN_CATEGORY_HT:
2415                 /* reject HT action frames from stations not supporting HT */
2416                 if (!rx->sta->sta.ht_cap.ht_supported)
2417                         goto invalid;
2418
2419                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2420                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2421                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2422                     sdata->vif.type != NL80211_IFTYPE_AP &&
2423                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2424                         break;
2425
2426                 /* verify action & smps_control/chanwidth are present */
2427                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2428                         goto invalid;
2429
2430                 switch (mgmt->u.action.u.ht_smps.action) {
2431                 case WLAN_HT_ACTION_SMPS: {
2432                         struct ieee80211_supported_band *sband;
2433                         enum ieee80211_smps_mode smps_mode;
2434
2435                         /* convert to HT capability */
2436                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2437                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2438                                 smps_mode = IEEE80211_SMPS_OFF;
2439                                 break;
2440                         case WLAN_HT_SMPS_CONTROL_STATIC:
2441                                 smps_mode = IEEE80211_SMPS_STATIC;
2442                                 break;
2443                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2444                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2445                                 break;
2446                         default:
2447                                 goto invalid;
2448                         }
2449
2450                         /* if no change do nothing */
2451                         if (rx->sta->sta.smps_mode == smps_mode)
2452                                 goto handled;
2453                         rx->sta->sta.smps_mode = smps_mode;
2454
2455                         sband = rx->local->hw.wiphy->bands[status->band];
2456
2457                         rate_control_rate_update(local, sband, rx->sta,
2458                                                  IEEE80211_RC_SMPS_CHANGED);
2459                         goto handled;
2460                 }
2461                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2462                         struct ieee80211_supported_band *sband;
2463                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2464                         enum ieee80211_sta_rx_bandwidth new_bw;
2465
2466                         /* If it doesn't support 40 MHz it can't change ... */
2467                         if (!(rx->sta->sta.ht_cap.cap &
2468                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2469                                 goto handled;
2470
2471                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2472                                 new_bw = IEEE80211_STA_RX_BW_20;
2473                         else
2474                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2475
2476                         if (rx->sta->sta.bandwidth == new_bw)
2477                                 goto handled;
2478
2479                         sband = rx->local->hw.wiphy->bands[status->band];
2480
2481                         rate_control_rate_update(local, sband, rx->sta,
2482                                                  IEEE80211_RC_BW_CHANGED);
2483                         goto handled;
2484                 }
2485                 default:
2486                         goto invalid;
2487                 }
2488
2489                 break;
2490         case WLAN_CATEGORY_PUBLIC:
2491                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2492                         goto invalid;
2493                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2494                         break;
2495                 if (!rx->sta)
2496                         break;
2497                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2498                         break;
2499                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2500                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2501                         break;
2502                 if (len < offsetof(struct ieee80211_mgmt,
2503                                    u.action.u.ext_chan_switch.variable))
2504                         goto invalid;
2505                 goto queue;
2506         case WLAN_CATEGORY_VHT:
2507                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2508                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2509                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2510                     sdata->vif.type != NL80211_IFTYPE_AP &&
2511                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2512                         break;
2513
2514                 /* verify action code is present */
2515                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2516                         goto invalid;
2517
2518                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2519                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2520                         u8 opmode;
2521
2522                         /* verify opmode is present */
2523                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2524                                 goto invalid;
2525
2526                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2527
2528                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2529                                                     opmode, status->band,
2530                                                     false);
2531                         goto handled;
2532                 }
2533                 default:
2534                         break;
2535                 }
2536                 break;
2537         case WLAN_CATEGORY_BACK:
2538                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2539                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2540                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2541                     sdata->vif.type != NL80211_IFTYPE_AP &&
2542                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2543                         break;
2544
2545                 /* verify action_code is present */
2546                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2547                         break;
2548
2549                 switch (mgmt->u.action.u.addba_req.action_code) {
2550                 case WLAN_ACTION_ADDBA_REQ:
2551                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2552                                    sizeof(mgmt->u.action.u.addba_req)))
2553                                 goto invalid;
2554                         break;
2555                 case WLAN_ACTION_ADDBA_RESP:
2556                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2557                                    sizeof(mgmt->u.action.u.addba_resp)))
2558                                 goto invalid;
2559                         break;
2560                 case WLAN_ACTION_DELBA:
2561                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2562                                    sizeof(mgmt->u.action.u.delba)))
2563                                 goto invalid;
2564                         break;
2565                 default:
2566                         goto invalid;
2567                 }
2568
2569                 goto queue;
2570         case WLAN_CATEGORY_SPECTRUM_MGMT:
2571                 /* verify action_code is present */
2572                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2573                         break;
2574
2575                 switch (mgmt->u.action.u.measurement.action_code) {
2576                 case WLAN_ACTION_SPCT_MSR_REQ:
2577                         if (status->band != IEEE80211_BAND_5GHZ)
2578                                 break;
2579
2580                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2581                                    sizeof(mgmt->u.action.u.measurement)))
2582                                 break;
2583
2584                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2585                                 break;
2586
2587                         ieee80211_process_measurement_req(sdata, mgmt, len);
2588                         goto handled;
2589                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2590                         u8 *bssid;
2591                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2592                                    sizeof(mgmt->u.action.u.chan_switch)))
2593                                 break;
2594
2595                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2596                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2597                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2598                                 break;
2599
2600                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2601                                 bssid = sdata->u.mgd.bssid;
2602                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2603                                 bssid = sdata->u.ibss.bssid;
2604                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2605                                 bssid = mgmt->sa;
2606                         else
2607                                 break;
2608
2609                         if (!ether_addr_equal(mgmt->bssid, bssid))
2610                                 break;
2611
2612                         goto queue;
2613                         }
2614                 }
2615                 break;
2616         case WLAN_CATEGORY_SA_QUERY:
2617                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2618                            sizeof(mgmt->u.action.u.sa_query)))
2619                         break;
2620
2621                 switch (mgmt->u.action.u.sa_query.action) {
2622                 case WLAN_ACTION_SA_QUERY_REQUEST:
2623                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2624                                 break;
2625                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2626                         goto handled;
2627                 }
2628                 break;
2629         case WLAN_CATEGORY_SELF_PROTECTED:
2630                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2631                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2632                         break;
2633
2634                 switch (mgmt->u.action.u.self_prot.action_code) {
2635                 case WLAN_SP_MESH_PEERING_OPEN:
2636                 case WLAN_SP_MESH_PEERING_CLOSE:
2637                 case WLAN_SP_MESH_PEERING_CONFIRM:
2638                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2639                                 goto invalid;
2640                         if (sdata->u.mesh.user_mpm)
2641                                 /* userspace handles this frame */
2642                                 break;
2643                         goto queue;
2644                 case WLAN_SP_MGK_INFORM:
2645                 case WLAN_SP_MGK_ACK:
2646                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2647                                 goto invalid;
2648                         break;
2649                 }
2650                 break;
2651         case WLAN_CATEGORY_MESH_ACTION:
2652                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2653                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2654                         break;
2655
2656                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2657                         break;
2658                 if (mesh_action_is_path_sel(mgmt) &&
2659                     !mesh_path_sel_is_hwmp(sdata))
2660                         break;
2661                 goto queue;
2662         }
2663
2664         return RX_CONTINUE;
2665
2666  invalid:
2667         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2668         /* will return in the next handlers */
2669         return RX_CONTINUE;
2670
2671  handled:
2672         if (rx->sta)
2673                 rx->sta->rx_packets++;
2674         dev_kfree_skb(rx->skb);
2675         return RX_QUEUED;
2676
2677  queue:
2678         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2679         skb_queue_tail(&sdata->skb_queue, rx->skb);
2680         ieee80211_queue_work(&local->hw, &sdata->work);
2681         if (rx->sta)
2682                 rx->sta->rx_packets++;
2683         return RX_QUEUED;
2684 }
2685
2686 static ieee80211_rx_result debug_noinline
2687 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2688 {
2689         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2690         int sig = 0;
2691
2692         /* skip known-bad action frames and return them in the next handler */
2693         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2694                 return RX_CONTINUE;
2695
2696         /*
2697          * Getting here means the kernel doesn't know how to handle
2698          * it, but maybe userspace does ... include returned frames
2699          * so userspace can register for those to know whether ones
2700          * it transmitted were processed or returned.
2701          */
2702
2703         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2704                 sig = status->signal;
2705
2706         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2707                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2708                 if (rx->sta)
2709                         rx->sta->rx_packets++;
2710                 dev_kfree_skb(rx->skb);
2711                 return RX_QUEUED;
2712         }
2713
2714         return RX_CONTINUE;
2715 }
2716
2717 static ieee80211_rx_result debug_noinline
2718 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2719 {
2720         struct ieee80211_local *local = rx->local;
2721         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2722         struct sk_buff *nskb;
2723         struct ieee80211_sub_if_data *sdata = rx->sdata;
2724         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2725
2726         if (!ieee80211_is_action(mgmt->frame_control))
2727                 return RX_CONTINUE;
2728
2729         /*
2730          * For AP mode, hostapd is responsible for handling any action
2731          * frames that we didn't handle, including returning unknown
2732          * ones. For all other modes we will return them to the sender,
2733          * setting the 0x80 bit in the action category, as required by
2734          * 802.11-2012 9.24.4.
2735          * Newer versions of hostapd shall also use the management frame
2736          * registration mechanisms, but older ones still use cooked
2737          * monitor interfaces so push all frames there.
2738          */
2739         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2740             (sdata->vif.type == NL80211_IFTYPE_AP ||
2741              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2742                 return RX_DROP_MONITOR;
2743
2744         if (is_multicast_ether_addr(mgmt->da))
2745                 return RX_DROP_MONITOR;
2746
2747         /* do not return rejected action frames */
2748         if (mgmt->u.action.category & 0x80)
2749                 return RX_DROP_UNUSABLE;
2750
2751         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2752                                GFP_ATOMIC);
2753         if (nskb) {
2754                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2755
2756                 nmgmt->u.action.category |= 0x80;
2757                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2758                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2759
2760                 memset(nskb->cb, 0, sizeof(nskb->cb));
2761
2762                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2763                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2764
2765                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2766                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2767                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2768                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2769                                 info->hw_queue =
2770                                         local->hw.offchannel_tx_hw_queue;
2771                 }
2772
2773                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2774                                             status->band);
2775         }
2776         dev_kfree_skb(rx->skb);
2777         return RX_QUEUED;
2778 }
2779
2780 static ieee80211_rx_result debug_noinline
2781 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2782 {
2783         struct ieee80211_sub_if_data *sdata = rx->sdata;
2784         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2785         __le16 stype;
2786
2787         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2788
2789         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2790             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2791             sdata->vif.type != NL80211_IFTYPE_STATION)
2792                 return RX_DROP_MONITOR;
2793
2794         switch (stype) {
2795         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2796         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2797         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2798                 /* process for all: mesh, mlme, ibss */
2799                 break;
2800         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2801         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2802         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2803         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2804                 if (is_multicast_ether_addr(mgmt->da) &&
2805                     !is_broadcast_ether_addr(mgmt->da))
2806                         return RX_DROP_MONITOR;
2807
2808                 /* process only for station */
2809                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2810                         return RX_DROP_MONITOR;
2811                 break;
2812         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2813                 /* process only for ibss and mesh */
2814                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2815                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2816                         return RX_DROP_MONITOR;
2817                 break;
2818         default:
2819                 return RX_DROP_MONITOR;
2820         }
2821
2822         /* queue up frame and kick off work to process it */
2823         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2824         skb_queue_tail(&sdata->skb_queue, rx->skb);
2825         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2826         if (rx->sta)
2827                 rx->sta->rx_packets++;
2828
2829         return RX_QUEUED;
2830 }
2831
2832 /* TODO: use IEEE80211_RX_FRAGMENTED */
2833 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2834                                         struct ieee80211_rate *rate)
2835 {
2836         struct ieee80211_sub_if_data *sdata;
2837         struct ieee80211_local *local = rx->local;
2838         struct sk_buff *skb = rx->skb, *skb2;
2839         struct net_device *prev_dev = NULL;
2840         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2841         int needed_headroom;
2842
2843         /*
2844          * If cooked monitor has been processed already, then
2845          * don't do it again. If not, set the flag.
2846          */
2847         if (rx->flags & IEEE80211_RX_CMNTR)
2848                 goto out_free_skb;
2849         rx->flags |= IEEE80211_RX_CMNTR;
2850
2851         /* If there are no cooked monitor interfaces, just free the SKB */
2852         if (!local->cooked_mntrs)
2853                 goto out_free_skb;
2854
2855         /* room for the radiotap header based on driver features */
2856         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2857
2858         if (skb_headroom(skb) < needed_headroom &&
2859             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2860                 goto out_free_skb;
2861
2862         /* prepend radiotap information */
2863         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2864                                          false);
2865
2866         skb_set_mac_header(skb, 0);
2867         skb->ip_summed = CHECKSUM_UNNECESSARY;
2868         skb->pkt_type = PACKET_OTHERHOST;
2869         skb->protocol = htons(ETH_P_802_2);
2870
2871         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2872                 if (!ieee80211_sdata_running(sdata))
2873                         continue;
2874
2875                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2876                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2877                         continue;
2878
2879                 if (prev_dev) {
2880                         skb2 = skb_clone(skb, GFP_ATOMIC);
2881                         if (skb2) {
2882                                 skb2->dev = prev_dev;
2883                                 netif_receive_skb(skb2);
2884                         }
2885                 }
2886
2887                 prev_dev = sdata->dev;
2888                 sdata->dev->stats.rx_packets++;
2889                 sdata->dev->stats.rx_bytes += skb->len;
2890         }
2891
2892         if (prev_dev) {
2893                 skb->dev = prev_dev;
2894                 netif_receive_skb(skb);
2895                 return;
2896         }
2897
2898  out_free_skb:
2899         dev_kfree_skb(skb);
2900 }
2901
2902 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2903                                          ieee80211_rx_result res)
2904 {
2905         switch (res) {
2906         case RX_DROP_MONITOR:
2907                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2908                 if (rx->sta)
2909                         rx->sta->rx_dropped++;
2910                 /* fall through */
2911         case RX_CONTINUE: {
2912                 struct ieee80211_rate *rate = NULL;
2913                 struct ieee80211_supported_band *sband;
2914                 struct ieee80211_rx_status *status;
2915
2916                 status = IEEE80211_SKB_RXCB((rx->skb));
2917
2918                 sband = rx->local->hw.wiphy->bands[status->band];
2919                 if (!(status->flag & RX_FLAG_HT) &&
2920                     !(status->flag & RX_FLAG_VHT))
2921                         rate = &sband->bitrates[status->rate_idx];
2922
2923                 ieee80211_rx_cooked_monitor(rx, rate);
2924                 break;
2925                 }
2926         case RX_DROP_UNUSABLE:
2927                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2928                 if (rx->sta)
2929                         rx->sta->rx_dropped++;
2930                 dev_kfree_skb(rx->skb);
2931                 break;
2932         case RX_QUEUED:
2933                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2934                 break;
2935         }
2936 }
2937
2938 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2939                                   struct sk_buff_head *frames)
2940 {
2941         ieee80211_rx_result res = RX_DROP_MONITOR;
2942         struct sk_buff *skb;
2943
2944 #define CALL_RXH(rxh)                   \
2945         do {                            \
2946                 res = rxh(rx);          \
2947                 if (res != RX_CONTINUE) \
2948                         goto rxh_next;  \
2949         } while (0);
2950
2951         spin_lock_bh(&rx->local->rx_path_lock);
2952
2953         while ((skb = __skb_dequeue(frames))) {
2954                 /*
2955                  * all the other fields are valid across frames
2956                  * that belong to an aMPDU since they are on the
2957                  * same TID from the same station
2958                  */
2959                 rx->skb = skb;
2960
2961                 CALL_RXH(ieee80211_rx_h_check_more_data)
2962                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2963                 CALL_RXH(ieee80211_rx_h_sta_process)
2964                 CALL_RXH(ieee80211_rx_h_decrypt)
2965                 CALL_RXH(ieee80211_rx_h_defragment)
2966                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2967                 /* must be after MMIC verify so header is counted in MPDU mic */
2968 #ifdef CONFIG_MAC80211_MESH
2969                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2970                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2971 #endif
2972                 CALL_RXH(ieee80211_rx_h_amsdu)
2973                 CALL_RXH(ieee80211_rx_h_data)
2974
2975                 /* special treatment -- needs the queue */
2976                 res = ieee80211_rx_h_ctrl(rx, frames);
2977                 if (res != RX_CONTINUE)
2978                         goto rxh_next;
2979
2980                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2981                 CALL_RXH(ieee80211_rx_h_action)
2982                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2983                 CALL_RXH(ieee80211_rx_h_action_return)
2984                 CALL_RXH(ieee80211_rx_h_mgmt)
2985
2986  rxh_next:
2987                 ieee80211_rx_handlers_result(rx, res);
2988
2989 #undef CALL_RXH
2990         }
2991
2992         spin_unlock_bh(&rx->local->rx_path_lock);
2993 }
2994
2995 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2996 {
2997         struct sk_buff_head reorder_release;
2998         ieee80211_rx_result res = RX_DROP_MONITOR;
2999
3000         __skb_queue_head_init(&reorder_release);
3001
3002 #define CALL_RXH(rxh)                   \
3003         do {                            \
3004                 res = rxh(rx);          \
3005                 if (res != RX_CONTINUE) \
3006                         goto rxh_next;  \
3007         } while (0);
3008
3009         CALL_RXH(ieee80211_rx_h_check)
3010
3011         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3012
3013         ieee80211_rx_handlers(rx, &reorder_release);
3014         return;
3015
3016  rxh_next:
3017         ieee80211_rx_handlers_result(rx, res);
3018
3019 #undef CALL_RXH
3020 }
3021
3022 /*
3023  * This function makes calls into the RX path, therefore
3024  * it has to be invoked under RCU read lock.
3025  */
3026 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3027 {
3028         struct sk_buff_head frames;
3029         struct ieee80211_rx_data rx = {
3030                 .sta = sta,
3031                 .sdata = sta->sdata,
3032                 .local = sta->local,
3033                 /* This is OK -- must be QoS data frame */
3034                 .security_idx = tid,
3035                 .seqno_idx = tid,
3036                 .flags = 0,
3037         };
3038         struct tid_ampdu_rx *tid_agg_rx;
3039
3040         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3041         if (!tid_agg_rx)
3042                 return;
3043
3044         __skb_queue_head_init(&frames);
3045
3046         spin_lock(&tid_agg_rx->reorder_lock);
3047         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3048         spin_unlock(&tid_agg_rx->reorder_lock);
3049
3050         ieee80211_rx_handlers(&rx, &frames);
3051 }
3052
3053 /* main receive path */
3054
3055 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3056                                 struct ieee80211_hdr *hdr)
3057 {
3058         struct ieee80211_sub_if_data *sdata = rx->sdata;
3059         struct sk_buff *skb = rx->skb;
3060         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3061         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3062         int multicast = is_multicast_ether_addr(hdr->addr1);
3063
3064         switch (sdata->vif.type) {
3065         case NL80211_IFTYPE_STATION:
3066                 if (!bssid && !sdata->u.mgd.use_4addr)
3067                         return 0;
3068                 if (!multicast &&
3069                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3070                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3071                             sdata->u.mgd.use_4addr)
3072                                 return 0;
3073                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3074                 }
3075                 break;
3076         case NL80211_IFTYPE_ADHOC:
3077                 if (!bssid)
3078                         return 0;
3079                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3080                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3081                         return 0;
3082                 if (ieee80211_is_beacon(hdr->frame_control)) {
3083                         return 1;
3084                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3085                         return 0;
3086                 } else if (!multicast &&
3087                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3088                         if (!(sdata->dev->flags & IFF_PROMISC))
3089                                 return 0;
3090                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3091                 } else if (!rx->sta) {
3092                         int rate_idx;
3093                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3094                                 rate_idx = 0; /* TODO: HT/VHT rates */
3095                         else
3096                                 rate_idx = status->rate_idx;
3097                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3098                                                  BIT(rate_idx));
3099                 }
3100                 break;
3101         case NL80211_IFTYPE_MESH_POINT:
3102                 if (!multicast &&
3103                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3104                         if (!(sdata->dev->flags & IFF_PROMISC))
3105                                 return 0;
3106
3107                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3108                 }
3109                 break;
3110         case NL80211_IFTYPE_AP_VLAN:
3111         case NL80211_IFTYPE_AP:
3112                 if (!bssid) {
3113                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3114                                 return 0;
3115                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3116                         /*
3117                          * Accept public action frames even when the
3118                          * BSSID doesn't match, this is used for P2P
3119                          * and location updates. Note that mac80211
3120                          * itself never looks at these frames.
3121                          */
3122                         if (!multicast &&
3123                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3124                                 return 0;
3125                         if (ieee80211_is_public_action(hdr, skb->len))
3126                                 return 1;
3127                         if (!ieee80211_is_beacon(hdr->frame_control))
3128                                 return 0;
3129                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3130                 }
3131                 break;
3132         case NL80211_IFTYPE_WDS:
3133                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3134                         return 0;
3135                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3136                         return 0;
3137                 break;
3138         case NL80211_IFTYPE_P2P_DEVICE:
3139                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3140                     !ieee80211_is_probe_req(hdr->frame_control) &&
3141                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3142                     !ieee80211_is_beacon(hdr->frame_control))
3143                         return 0;
3144                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3145                     !multicast)
3146                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3147                 break;
3148         default:
3149                 /* should never get here */
3150                 WARN_ON_ONCE(1);
3151                 break;
3152         }
3153
3154         return 1;
3155 }
3156
3157 /*
3158  * This function returns whether or not the SKB
3159  * was destined for RX processing or not, which,
3160  * if consume is true, is equivalent to whether
3161  * or not the skb was consumed.
3162  */
3163 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3164                                             struct sk_buff *skb, bool consume)
3165 {
3166         struct ieee80211_local *local = rx->local;
3167         struct ieee80211_sub_if_data *sdata = rx->sdata;
3168         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3169         struct ieee80211_hdr *hdr = (void *)skb->data;
3170         int prepares;
3171
3172         rx->skb = skb;
3173         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3174         prepares = prepare_for_handlers(rx, hdr);
3175
3176         if (!prepares)
3177                 return false;
3178
3179         if (!consume) {
3180                 skb = skb_copy(skb, GFP_ATOMIC);
3181                 if (!skb) {
3182                         if (net_ratelimit())
3183                                 wiphy_debug(local->hw.wiphy,
3184                                         "failed to copy skb for %s\n",
3185                                         sdata->name);
3186                         return true;
3187                 }
3188
3189                 rx->skb = skb;
3190         }
3191
3192         ieee80211_invoke_rx_handlers(rx);
3193         return true;
3194 }
3195
3196 /*
3197  * This is the actual Rx frames handler. as it blongs to Rx path it must
3198  * be called with rcu_read_lock protection.
3199  */
3200 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3201                                          struct sk_buff *skb)
3202 {
3203         struct ieee80211_local *local = hw_to_local(hw);
3204         struct ieee80211_sub_if_data *sdata;
3205         struct ieee80211_hdr *hdr;
3206         __le16 fc;
3207         struct ieee80211_rx_data rx;
3208         struct ieee80211_sub_if_data *prev;
3209         struct sta_info *sta, *tmp, *prev_sta;
3210         int err = 0;
3211
3212         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3213         memset(&rx, 0, sizeof(rx));
3214         rx.skb = skb;
3215         rx.local = local;
3216
3217         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3218                 local->dot11ReceivedFragmentCount++;
3219
3220         if (ieee80211_is_mgmt(fc)) {
3221                 /* drop frame if too short for header */
3222                 if (skb->len < ieee80211_hdrlen(fc))
3223                         err = -ENOBUFS;
3224                 else
3225                         err = skb_linearize(skb);
3226         } else {
3227                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3228         }
3229
3230         if (err) {
3231                 dev_kfree_skb(skb);
3232                 return;
3233         }
3234
3235         hdr = (struct ieee80211_hdr *)skb->data;
3236         ieee80211_parse_qos(&rx);
3237         ieee80211_verify_alignment(&rx);
3238
3239         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3240                      ieee80211_is_beacon(hdr->frame_control)))
3241                 ieee80211_scan_rx(local, skb);
3242
3243         if (ieee80211_is_data(fc)) {
3244                 prev_sta = NULL;
3245
3246                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3247                         if (!prev_sta) {
3248                                 prev_sta = sta;
3249                                 continue;
3250                         }
3251
3252                         rx.sta = prev_sta;
3253                         rx.sdata = prev_sta->sdata;
3254                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3255
3256                         prev_sta = sta;
3257                 }
3258
3259                 if (prev_sta) {
3260                         rx.sta = prev_sta;
3261                         rx.sdata = prev_sta->sdata;
3262
3263                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3264                                 return;
3265                         goto out;
3266                 }
3267         }
3268
3269         prev = NULL;
3270
3271         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3272                 if (!ieee80211_sdata_running(sdata))
3273                         continue;
3274
3275                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3276                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3277                         continue;
3278
3279                 /*
3280                  * frame is destined for this interface, but if it's
3281                  * not also for the previous one we handle that after
3282                  * the loop to avoid copying the SKB once too much
3283                  */
3284
3285                 if (!prev) {
3286                         prev = sdata;
3287                         continue;
3288                 }
3289
3290                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3291                 rx.sdata = prev;
3292                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3293
3294                 prev = sdata;
3295         }
3296
3297         if (prev) {
3298                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3299                 rx.sdata = prev;
3300
3301                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3302                         return;
3303         }
3304
3305  out:
3306         dev_kfree_skb(skb);
3307 }
3308
3309 /*
3310  * This is the receive path handler. It is called by a low level driver when an
3311  * 802.11 MPDU is received from the hardware.
3312  */
3313 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3314 {
3315         struct ieee80211_local *local = hw_to_local(hw);
3316         struct ieee80211_rate *rate = NULL;
3317         struct ieee80211_supported_band *sband;
3318         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3319
3320         WARN_ON_ONCE(softirq_count() == 0);
3321
3322         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3323                 goto drop;
3324
3325         sband = local->hw.wiphy->bands[status->band];
3326         if (WARN_ON(!sband))
3327                 goto drop;
3328
3329         /*
3330          * If we're suspending, it is possible although not too likely
3331          * that we'd be receiving frames after having already partially
3332          * quiesced the stack. We can't process such frames then since
3333          * that might, for example, cause stations to be added or other
3334          * driver callbacks be invoked.
3335          */
3336         if (unlikely(local->quiescing || local->suspended))
3337                 goto drop;
3338
3339         /* We might be during a HW reconfig, prevent Rx for the same reason */
3340         if (unlikely(local->in_reconfig))
3341                 goto drop;
3342
3343         /*
3344          * The same happens when we're not even started,
3345          * but that's worth a warning.
3346          */
3347         if (WARN_ON(!local->started))
3348                 goto drop;
3349
3350         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3351                 /*
3352                  * Validate the rate, unless a PLCP error means that
3353                  * we probably can't have a valid rate here anyway.
3354                  */
3355
3356                 if (status->flag & RX_FLAG_HT) {
3357                         /*
3358                          * rate_idx is MCS index, which can be [0-76]
3359                          * as documented on:
3360                          *
3361                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3362                          *
3363                          * Anything else would be some sort of driver or
3364                          * hardware error. The driver should catch hardware
3365                          * errors.
3366                          */
3367                         if (WARN(status->rate_idx > 76,
3368                                  "Rate marked as an HT rate but passed "
3369                                  "status->rate_idx is not "
3370                                  "an MCS index [0-76]: %d (0x%02x)\n",
3371                                  status->rate_idx,
3372                                  status->rate_idx))
3373                                 goto drop;
3374                 } else if (status->flag & RX_FLAG_VHT) {
3375                         if (WARN_ONCE(status->rate_idx > 9 ||
3376                                       !status->vht_nss ||
3377                                       status->vht_nss > 8,
3378                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3379                                       status->rate_idx, status->vht_nss))
3380                                 goto drop;
3381                 } else {
3382                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3383                                 goto drop;
3384                         rate = &sband->bitrates[status->rate_idx];
3385                 }
3386         }
3387
3388         status->rx_flags = 0;
3389
3390         /*
3391          * key references and virtual interfaces are protected using RCU
3392          * and this requires that we are in a read-side RCU section during
3393          * receive processing
3394          */
3395         rcu_read_lock();
3396
3397         /*
3398          * Frames with failed FCS/PLCP checksum are not returned,
3399          * all other frames are returned without radiotap header
3400          * if it was previously present.
3401          * Also, frames with less than 16 bytes are dropped.
3402          */
3403         skb = ieee80211_rx_monitor(local, skb, rate);
3404         if (!skb) {
3405                 rcu_read_unlock();
3406                 return;
3407         }
3408
3409         ieee80211_tpt_led_trig_rx(local,
3410                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3411                         skb->len);
3412         __ieee80211_rx_handle_packet(hw, skb);
3413
3414         rcu_read_unlock();
3415
3416         return;
3417  drop:
3418         kfree_skb(skb);
3419 }
3420 EXPORT_SYMBOL(ieee80211_rx);
3421
3422 /* This is a version of the rx handler that can be called from hard irq
3423  * context. Post the skb on the queue and schedule the tasklet */
3424 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3425 {
3426         struct ieee80211_local *local = hw_to_local(hw);
3427
3428         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3429
3430         skb->pkt_type = IEEE80211_RX_MSG;
3431         skb_queue_tail(&local->skb_queue, skb);
3432         tasklet_schedule(&local->tasklet);
3433 }
3434 EXPORT_SYMBOL(ieee80211_rx_irqsafe);