net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "led.h"
  27 #include "mesh.h"
  28 #include "wep.h"
  29 #include "wpa.h"
  30 #include "tkip.h"
  31 #include "wme.h"
  32 #include "rate.h"
  33
  34 /*
  35  * monitor mode reception
  36  *
  37  * This function cleans up the SKB, i.e. it removes all the stuff
  38  * only useful for monitoring.
  39  */
  40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  41                                            struct sk_buff *skb)
  42 {
  43         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
  44                 if (likely(skb->len > FCS_LEN))
  45                         __pskb_trim(skb, skb->len - FCS_LEN);
  46                 else {
  47                         /* driver bug */
  48                         WARN_ON(1);
  49                         dev_kfree_skb(skb);
  50                         return NULL;
  51                 }
  52         }
  53
  54         return skb;
  55 }
  56
  57 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
  58 {
  59         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  60         struct ieee80211_hdr *hdr;
  61
  62         hdr = (void *)(skb->data);
  63
  64         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
  65                             RX_FLAG_FAILED_PLCP_CRC |
  66                             RX_FLAG_AMPDU_IS_ZEROLEN))
  67                 return 1;
  68         if (unlikely(skb->len < 16 + present_fcs_len))
  69                 return 1;
  70         if (ieee80211_is_ctl(hdr->frame_control) &&
  71             !ieee80211_is_pspoll(hdr->frame_control) &&
  72             !ieee80211_is_back_req(hdr->frame_control))
  73                 return 1;
  74         return 0;
  75 }
  76
  77 static int
  78 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
  79                             struct ieee80211_rx_status *status)
  80 {
  81         int len;
  82
  83         /* always present fields */
  84         len = sizeof(struct ieee80211_radiotap_header) + 8;
  85
  86         /* allocate extra bitmaps */
  87         if (status->chains)
  88                 len += 4 * hweight8(status->chains);
  89
  90         if (ieee80211_have_rx_timestamp(status)) {
  91                 len = ALIGN(len, 8);
  92                 len += 8;
  93         }
  94         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
  95                 len += 1;
  96
  97         /* antenna field, if we don't have per-chain info */
  98         if (!status->chains)
  99                 len += 1;
 100
 101         /* padding for RX_FLAGS if necessary */
 102         len = ALIGN(len, 2);
 103
 104         if (status->flag & RX_FLAG_HT) /* HT info */
 105                 len += 3;
 106
 107         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 108                 len = ALIGN(len, 4);
 109                 len += 8;
 110         }
 111
 112         if (status->flag & RX_FLAG_VHT) {
 113                 len = ALIGN(len, 2);
 114                 len += 12;
 115         }
 116
 117         if (status->chains) {
 118                 /* antenna and antenna signal fields */
 119                 len += 2 * hweight8(status->chains);
 120         }
 121
 122         return len;
 123 }
 124
 125 /*
 126  * ieee80211_add_rx_radiotap_header - add radiotap header
 127  *
 128  * add a radiotap header containing all the fields which the hardware provided.
 129  */
 130 static void
 131 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 132                                  struct sk_buff *skb,
 133                                  struct ieee80211_rate *rate,
 134                                  int rtap_len, bool has_fcs)
 135 {
 136         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 137         struct ieee80211_radiotap_header *rthdr;
 138         unsigned char *pos;
 139         __le32 *it_present;
 140         u32 it_present_val;
 141         u16 rx_flags = 0;
 142         u16 channel_flags = 0;
 143         int mpdulen, chain;
 144         unsigned long chains = status->chains;
 145
 146         mpdulen = skb->len;
 147         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
 148                 mpdulen += FCS_LEN;
 149
 150         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 151         memset(rthdr, 0, rtap_len);
 152         it_present = &rthdr->it_present;
 153
 154         /* radiotap header, set always present flags */
 155         rthdr->it_len = cpu_to_le16(rtap_len);
 156         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 157                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 158                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 159
 160         if (!status->chains)
 161                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 162
 163         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 164                 it_present_val |=
 165                         BIT(IEEE80211_RADIOTAP_EXT) |
 166                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 167                 put_unaligned_le32(it_present_val, it_present);
 168                 it_present++;
 169                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 170                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 171         }
 172
 173         put_unaligned_le32(it_present_val, it_present);
 174
 175         pos = (void *)(it_present + 1);
 176
 177         /* the order of the following fields is important */
 178
 179         /* IEEE80211_RADIOTAP_TSFT */
 180         if (ieee80211_have_rx_timestamp(status)) {
 181                 /* padding */
 182                 while ((pos - (u8 *)rthdr) & 7)
 183                         *pos++ = 0;
 184                 put_unaligned_le64(
 185                         ieee80211_calculate_rx_timestamp(local, status,
 186                                                          mpdulen, 0),
 187                         pos);
 188                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 189                 pos += 8;
 190         }
 191
 192         /* IEEE80211_RADIOTAP_FLAGS */
 193         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
 194                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 195         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 196                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 197         if (status->flag & RX_FLAG_SHORTPRE)
 198                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 199         pos++;
 200
 201         /* IEEE80211_RADIOTAP_RATE */
 202         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 203                 /*
 204                  * Without rate information don't add it. If we have,
 205                  * MCS information is a separate field in radiotap,
 206                  * added below. The byte here is needed as padding
 207                  * for the channel though, so initialise it to 0.
 208                  */
 209                 *pos = 0;
 210         } else {
 211                 int shift = 0;
 212                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 213                 if (status->flag & RX_FLAG_10MHZ)
 214                         shift = 1;
 215                 else if (status->flag & RX_FLAG_5MHZ)
 216                         shift = 2;
 217                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 218         }
 219         pos++;
 220
 221         /* IEEE80211_RADIOTAP_CHANNEL */
 222         put_unaligned_le16(status->freq, pos);
 223         pos += 2;
 224         if (status->flag & RX_FLAG_10MHZ)
 225                 channel_flags |= IEEE80211_CHAN_HALF;
 226         else if (status->flag & RX_FLAG_5MHZ)
 227                 channel_flags |= IEEE80211_CHAN_QUARTER;
 228
 229         if (status->band == IEEE80211_BAND_5GHZ)
 230                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 231         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 232                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 233         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 234                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 235         else if (rate)
 236                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 237         else
 238                 channel_flags |= IEEE80211_CHAN_2GHZ;
 239         put_unaligned_le16(channel_flags, pos);
 240         pos += 2;
 241
 242         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 243         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
 244             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 245                 *pos = status->signal;
 246                 rthdr->it_present |=
 247                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 248                 pos++;
 249         }
 250
 251         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 252
 253         if (!status->chains) {
 254                 /* IEEE80211_RADIOTAP_ANTENNA */
 255                 *pos = status->antenna;
 256                 pos++;
 257         }
 258
 259         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 260
 261         /* IEEE80211_RADIOTAP_RX_FLAGS */
 262         /* ensure 2 byte alignment for the 2 byte field as required */
 263         if ((pos - (u8 *)rthdr) & 1)
 264                 *pos++ = 0;
 265         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 266                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 267         put_unaligned_le16(rx_flags, pos);
 268         pos += 2;
 269
 270         if (status->flag & RX_FLAG_HT) {
 271                 unsigned int stbc;
 272
 273                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 274                 *pos++ = local->hw.radiotap_mcs_details;
 275                 *pos = 0;
 276                 if (status->flag & RX_FLAG_SHORT_GI)
 277                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 278                 if (status->flag & RX_FLAG_40MHZ)
 279                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 280                 if (status->flag & RX_FLAG_HT_GF)
 281                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 282                 if (status->flag & RX_FLAG_LDPC)
 283                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 284                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 285                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 286                 pos++;
 287                 *pos++ = status->rate_idx;
 288         }
 289
 290         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 291                 u16 flags = 0;
 292
 293                 /* ensure 4 byte alignment */
 294                 while ((pos - (u8 *)rthdr) & 3)
 295                         pos++;
 296                 rthdr->it_present |=
 297                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 298                 put_unaligned_le32(status->ampdu_reference, pos);
 299                 pos += 4;
 300                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
 301                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
 302                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
 303                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
 304                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 305                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 306                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 307                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 308                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 309                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 310                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 311                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 312                 put_unaligned_le16(flags, pos);
 313                 pos += 2;
 314                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 315                         *pos++ = status->ampdu_delimiter_crc;
 316                 else
 317                         *pos++ = 0;
 318                 *pos++ = 0;
 319         }
 320
 321         if (status->flag & RX_FLAG_VHT) {
 322                 u16 known = local->hw.radiotap_vht_details;
 323
 324                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 325                 /* known field - how to handle 80+80? */
 326                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 327                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 328                 put_unaligned_le16(known, pos);
 329                 pos += 2;
 330                 /* flags */
 331                 if (status->flag & RX_FLAG_SHORT_GI)
 332                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 333                 /* in VHT, STBC is binary */
 334                 if (status->flag & RX_FLAG_STBC_MASK)
 335                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 336                 pos++;
 337                 /* bandwidth */
 338                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 339                         *pos++ = 4;
 340                 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
 341                         *pos++ = 0; /* marked not known above */
 342                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 343                         *pos++ = 11;
 344                 else if (status->flag & RX_FLAG_40MHZ)
 345                         *pos++ = 1;
 346                 else /* 20 MHz */
 347                         *pos++ = 0;
 348                 /* MCS/NSS */
 349                 *pos = (status->rate_idx << 4) | status->vht_nss;
 350                 pos += 4;
 351                 /* coding field */
 352                 if (status->flag & RX_FLAG_LDPC)
 353                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 354                 pos++;
 355                 /* group ID */
 356                 pos++;
 357                 /* partial_aid */
 358                 pos += 2;
 359         }
 360
 361         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 362                 *pos++ = status->chain_signal[chain];
 363                 *pos++ = chain;
 364         }
 365 }
 366
 367 /*
 368  * This function copies a received frame to all monitor interfaces and
 369  * returns a cleaned-up SKB that no longer includes the FCS nor the
 370  * radiotap header the driver might have added.
 371  */
 372 static struct sk_buff *
 373 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 374                      struct ieee80211_rate *rate)
 375 {
 376         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 377         struct ieee80211_sub_if_data *sdata;
 378         int needed_headroom;
 379         struct sk_buff *skb, *skb2;
 380         struct net_device *prev_dev = NULL;
 381         int present_fcs_len = 0;
 382
 383         /*
 384          * First, we may need to make a copy of the skb because
 385          *  (1) we need to modify it for radiotap (if not present), and
 386          *  (2) the other RX handlers will modify the skb we got.
 387          *
 388          * We don't need to, of course, if we aren't going to return
 389          * the SKB because it has a bad FCS/PLCP checksum.
 390          */
 391
 392         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 393                 present_fcs_len = FCS_LEN;
 394
 395         /* ensure hdr->frame_control is in skb head */
 396         if (!pskb_may_pull(origskb, 2)) {
 397                 dev_kfree_skb(origskb);
 398                 return NULL;
 399         }
 400
 401         if (!local->monitors) {
 402                 if (should_drop_frame(origskb, present_fcs_len)) {
 403                         dev_kfree_skb(origskb);
 404                         return NULL;
 405                 }
 406
 407                 return remove_monitor_info(local, origskb);
 408         }
 409
 410         /* room for the radiotap header based on driver features */
 411         needed_headroom = ieee80211_rx_radiotap_space(local, status);
 412
 413         if (should_drop_frame(origskb, present_fcs_len)) {
 414                 /* only need to expand headroom if necessary */
 415                 skb = origskb;
 416                 origskb = NULL;
 417
 418                 /*
 419                  * This shouldn't trigger often because most devices have an
 420                  * RX header they pull before we get here, and that should
 421                  * be big enough for our radiotap information. We should
 422                  * probably export the length to drivers so that we can have
 423                  * them allocate enough headroom to start with.
 424                  */
 425                 if (skb_headroom(skb) < needed_headroom &&
 426                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 427                         dev_kfree_skb(skb);
 428                         return NULL;
 429                 }
 430         } else {
 431                 /*
 432                  * Need to make a copy and possibly remove radiotap header
 433                  * and FCS from the original.
 434                  */
 435                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 436
 437                 origskb = remove_monitor_info(local, origskb);
 438
 439                 if (!skb)
 440                         return origskb;
 441         }
 442
 443         /* prepend radiotap information */
 444         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
 445                                          true);
 446
 447         skb_reset_mac_header(skb);
 448         skb->ip_summed = CHECKSUM_UNNECESSARY;
 449         skb->pkt_type = PACKET_OTHERHOST;
 450         skb->protocol = htons(ETH_P_802_2);
 451
 452         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 453                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 454                         continue;
 455
 456                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
 457                         continue;
 458
 459                 if (!ieee80211_sdata_running(sdata))
 460                         continue;
 461
 462                 if (prev_dev) {
 463                         skb2 = skb_clone(skb, GFP_ATOMIC);
 464                         if (skb2) {
 465                                 skb2->dev = prev_dev;
 466                                 netif_receive_skb(skb2);
 467                         }
 468                 }
 469
 470                 prev_dev = sdata->dev;
 471                 sdata->dev->stats.rx_packets++;
 472                 sdata->dev->stats.rx_bytes += skb->len;
 473         }
 474
 475         if (prev_dev) {
 476                 skb->dev = prev_dev;
 477                 netif_receive_skb(skb);
 478         } else
 479                 dev_kfree_skb(skb);
 480
 481         return origskb;
 482 }
 483
 484 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 485 {
 486         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 487         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 488         int tid, seqno_idx, security_idx;
 489
 490         /* does the frame have a qos control field? */
 491         if (ieee80211_is_data_qos(hdr->frame_control)) {
 492                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 493                 /* frame has qos control */
 494                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 495                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 496                         status->rx_flags |= IEEE80211_RX_AMSDU;
 497
 498                 seqno_idx = tid;
 499                 security_idx = tid;
 500         } else {
 501                 /*
 502                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 503                  *
 504                  *      Sequence numbers for management frames, QoS data
 505                  *      frames with a broadcast/multicast address in the
 506                  *      Address 1 field, and all non-QoS data frames sent
 507                  *      by QoS STAs are assigned using an additional single
 508                  *      modulo-4096 counter, [...]
 509                  *
 510                  * We also use that counter for non-QoS STAs.
 511                  */
 512                 seqno_idx = IEEE80211_NUM_TIDS;
 513                 security_idx = 0;
 514                 if (ieee80211_is_mgmt(hdr->frame_control))
 515                         security_idx = IEEE80211_NUM_TIDS;
 516                 tid = 0;
 517         }
 518
 519         rx->seqno_idx = seqno_idx;
 520         rx->security_idx = security_idx;
 521         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 522          * For now, set skb->priority to 0 for other cases. */
 523         rx->skb->priority = (tid > 7) ? 0 : tid;
 524 }
 525
 526 /**
 527  * DOC: Packet alignment
 528  *
 529  * Drivers always need to pass packets that are aligned to two-byte boundaries
 530  * to the stack.
 531  *
 532  * Additionally, should, if possible, align the payload data in a way that
 533  * guarantees that the contained IP header is aligned to a four-byte
 534  * boundary. In the case of regular frames, this simply means aligning the
 535  * payload to a four-byte boundary (because either the IP header is directly
 536  * contained, or IV/RFC1042 headers that have a length divisible by four are
 537  * in front of it).  If the payload data is not properly aligned and the
 538  * architecture doesn't support efficient unaligned operations, mac80211
 539  * will align the data.
 540  *
 541  * With A-MSDU frames, however, the payload data address must yield two modulo
 542  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 543  * push the IP header further back to a multiple of four again. Thankfully, the
 544  * specs were sane enough this time around to require padding each A-MSDU
 545  * subframe to a length that is a multiple of four.
 546  *
 547  * Padding like Atheros hardware adds which is between the 802.11 header and
 548  * the payload is not supported, the driver is required to move the 802.11
 549  * header to be directly in front of the payload in that case.
 550  */
 551 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 552 {
 553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 554         WARN_ONCE((unsigned long)rx->skb->data & 1,
 555                   "unaligned packet at 0x%p\n", rx->skb->data);
 556 #endif
 557 }
 558
 559
 560 /* rx handlers */
 561
 562 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 563 {
 564         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 565
 566         if (is_multicast_ether_addr(hdr->addr1))
 567                 return 0;
 568
 569         return ieee80211_is_robust_mgmt_frame(skb);
 570 }
 571
 572
 573 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 574 {
 575         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 576
 577         if (!is_multicast_ether_addr(hdr->addr1))
 578                 return 0;
 579
 580         return ieee80211_is_robust_mgmt_frame(skb);
 581 }
 582
 583
 584 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 585 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 586 {
 587         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 588         struct ieee80211_mmie *mmie;
 589
 590         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 591                 return -1;
 592
 593         if (!ieee80211_is_robust_mgmt_frame(skb))
 594                 return -1; /* not a robust management frame */
 595
 596         mmie = (struct ieee80211_mmie *)
 597                 (skb->data + skb->len - sizeof(*mmie));
 598         if (mmie->element_id != WLAN_EID_MMIE ||
 599             mmie->length != sizeof(*mmie) - 2)
 600                 return -1;
 601
 602         return le16_to_cpu(mmie->key_id);
 603 }
 604
 605 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 606                                  struct sk_buff *skb)
 607 {
 608         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 609         __le16 fc;
 610         int hdrlen;
 611         u8 keyid;
 612
 613         fc = hdr->frame_control;
 614         hdrlen = ieee80211_hdrlen(fc);
 615
 616         if (skb->len < hdrlen + cs->hdr_len)
 617                 return -EINVAL;
 618
 619         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 620         keyid &= cs->key_idx_mask;
 621         keyid >>= cs->key_idx_shift;
 622
 623         return keyid;
 624 }
 625
 626 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 627 {
 628         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 629         char *dev_addr = rx->sdata->vif.addr;
 630
 631         if (ieee80211_is_data(hdr->frame_control)) {
 632                 if (is_multicast_ether_addr(hdr->addr1)) {
 633                         if (ieee80211_has_tods(hdr->frame_control) ||
 634                             !ieee80211_has_fromds(hdr->frame_control))
 635                                 return RX_DROP_MONITOR;
 636                         if (ether_addr_equal(hdr->addr3, dev_addr))
 637                                 return RX_DROP_MONITOR;
 638                 } else {
 639                         if (!ieee80211_has_a4(hdr->frame_control))
 640                                 return RX_DROP_MONITOR;
 641                         if (ether_addr_equal(hdr->addr4, dev_addr))
 642                                 return RX_DROP_MONITOR;
 643                 }
 644         }
 645
 646         /* If there is not an established peer link and this is not a peer link
 647          * establisment frame, beacon or probe, drop the frame.
 648          */
 649
 650         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 651                 struct ieee80211_mgmt *mgmt;
 652
 653                 if (!ieee80211_is_mgmt(hdr->frame_control))
 654                         return RX_DROP_MONITOR;
 655
 656                 if (ieee80211_is_action(hdr->frame_control)) {
 657                         u8 category;
 658
 659                         /* make sure category field is present */
 660                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 661                                 return RX_DROP_MONITOR;
 662
 663                         mgmt = (struct ieee80211_mgmt *)hdr;
 664                         category = mgmt->u.action.category;
 665                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 666                             category != WLAN_CATEGORY_SELF_PROTECTED)
 667                                 return RX_DROP_MONITOR;
 668                         return RX_CONTINUE;
 669                 }
 670
 671                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 672                     ieee80211_is_probe_resp(hdr->frame_control) ||
 673                     ieee80211_is_beacon(hdr->frame_control) ||
 674                     ieee80211_is_auth(hdr->frame_control))
 675                         return RX_CONTINUE;
 676
 677                 return RX_DROP_MONITOR;
 678         }
 679
 680         return RX_CONTINUE;
 681 }
 682
 683 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 684                                             struct tid_ampdu_rx *tid_agg_rx,
 685                                             int index,
 686                                             struct sk_buff_head *frames)
 687 {
 688         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
 689         struct ieee80211_rx_status *status;
 690
 691         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 692
 693         if (!skb)
 694                 goto no_frame;
 695
 696         /* release the frame from the reorder ring buffer */
 697         tid_agg_rx->stored_mpdu_num--;
 698         tid_agg_rx->reorder_buf[index] = NULL;
 699         status = IEEE80211_SKB_RXCB(skb);
 700         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 701         __skb_queue_tail(frames, skb);
 702
 703 no_frame:
 704         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 705 }
 706
 707 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 708                                              struct tid_ampdu_rx *tid_agg_rx,
 709                                              u16 head_seq_num,
 710                                              struct sk_buff_head *frames)
 711 {
 712         int index;
 713
 714         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 715
 716         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 717                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 718                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 719                                                 frames);
 720         }
 721 }
 722
 723 /*
 724  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 725  * the skb was added to the buffer longer than this time ago, the earlier
 726  * frames that have not yet been received are assumed to be lost and the skb
 727  * can be released for processing. This may also release other skb's from the
 728  * reorder buffer if there are no additional gaps between the frames.
 729  *
 730  * Callers must hold tid_agg_rx->reorder_lock.
 731  */
 732 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 733
 734 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 735                                           struct tid_ampdu_rx *tid_agg_rx,
 736                                           struct sk_buff_head *frames)
 737 {
 738         int index, j;
 739
 740         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 741
 742         /* release the buffer until next missing frame */
 743         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 744         if (!tid_agg_rx->reorder_buf[index] &&
 745             tid_agg_rx->stored_mpdu_num) {
 746                 /*
 747                  * No buffers ready to be released, but check whether any
 748                  * frames in the reorder buffer have timed out.
 749                  */
 750                 int skipped = 1;
 751                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 752                      j = (j + 1) % tid_agg_rx->buf_size) {
 753                         if (!tid_agg_rx->reorder_buf[j]) {
 754                                 skipped++;
 755                                 continue;
 756                         }
 757                         if (skipped &&
 758                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 759                                         HT_RX_REORDER_BUF_TIMEOUT))
 760                                 goto set_release_timer;
 761
 762                         ht_dbg_ratelimited(sdata,
 763                                            "release an RX reorder frame due to timeout on earlier frames\n");
 764                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 765                                                         frames);
 766
 767                         /*
 768                          * Increment the head seq# also for the skipped slots.
 769                          */
 770                         tid_agg_rx->head_seq_num =
 771                                 (tid_agg_rx->head_seq_num +
 772                                  skipped) & IEEE80211_SN_MASK;
 773                         skipped = 0;
 774                 }
 775         } else while (tid_agg_rx->reorder_buf[index]) {
 776                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 777                                                 frames);
 778                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 779         }
 780
 781         if (tid_agg_rx->stored_mpdu_num) {
 782                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 783
 784                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 785                      j = (j + 1) % tid_agg_rx->buf_size) {
 786                         if (tid_agg_rx->reorder_buf[j])
 787                                 break;
 788                 }
 789
 790  set_release_timer:
 791
 792                 mod_timer(&tid_agg_rx->reorder_timer,
 793                           tid_agg_rx->reorder_time[j] + 1 +
 794                           HT_RX_REORDER_BUF_TIMEOUT);
 795         } else {
 796                 del_timer(&tid_agg_rx->reorder_timer);
 797         }
 798 }
 799
 800 /*
 801  * As this function belongs to the RX path it must be under
 802  * rcu_read_lock protection. It returns false if the frame
 803  * can be processed immediately, true if it was consumed.
 804  */
 805 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
 806                                              struct tid_ampdu_rx *tid_agg_rx,
 807                                              struct sk_buff *skb,
 808                                              struct sk_buff_head *frames)
 809 {
 810         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 811         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 812         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
 813         u16 head_seq_num, buf_size;
 814         int index;
 815         bool ret = true;
 816
 817         spin_lock(&tid_agg_rx->reorder_lock);
 818
 819         buf_size = tid_agg_rx->buf_size;
 820         head_seq_num = tid_agg_rx->head_seq_num;
 821
 822         /* frame with out of date sequence number */
 823         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
 824                 dev_kfree_skb(skb);
 825                 goto out;
 826         }
 827
 828         /*
 829          * If frame the sequence number exceeds our buffering window
 830          * size release some previous frames to make room for this one.
 831          */
 832         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
 833                 head_seq_num = ieee80211_sn_inc(
 834                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
 835                 /* release stored frames up to new head to stack */
 836                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
 837                                                  head_seq_num, frames);
 838         }
 839
 840         /* Now the new frame is always in the range of the reordering buffer */
 841
 842         index = mpdu_seq_num % tid_agg_rx->buf_size;
 843
 844         /* check if we already stored this frame */
 845         if (tid_agg_rx->reorder_buf[index]) {
 846                 dev_kfree_skb(skb);
 847                 goto out;
 848         }
 849
 850         /*
 851          * If the current MPDU is in the right order and nothing else
 852          * is stored we can process it directly, no need to buffer it.
 853          * If it is first but there's something stored, we may be able
 854          * to release frames after this one.
 855          */
 856         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
 857             tid_agg_rx->stored_mpdu_num == 0) {
 858                 tid_agg_rx->head_seq_num =
 859                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 860                 ret = false;
 861                 goto out;
 862         }
 863
 864         /* put the frame in the reordering buffer */
 865         tid_agg_rx->reorder_buf[index] = skb;
 866         tid_agg_rx->reorder_time[index] = jiffies;
 867         tid_agg_rx->stored_mpdu_num++;
 868         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
 869
 870  out:
 871         spin_unlock(&tid_agg_rx->reorder_lock);
 872         return ret;
 873 }
 874
 875 /*
 876  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 877  * true if the MPDU was buffered, false if it should be processed.
 878  */
 879 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 880                                        struct sk_buff_head *frames)
 881 {
 882         struct sk_buff *skb = rx->skb;
 883         struct ieee80211_local *local = rx->local;
 884         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 885         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 886         struct sta_info *sta = rx->sta;
 887         struct tid_ampdu_rx *tid_agg_rx;
 888         u16 sc;
 889         u8 tid, ack_policy;
 890
 891         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 892             is_multicast_ether_addr(hdr->addr1))
 893                 goto dont_reorder;
 894
 895         /*
 896          * filter the QoS data rx stream according to
 897          * STA/TID and check if this STA/TID is on aggregation
 898          */
 899
 900         if (!sta)
 901                 goto dont_reorder;
 902
 903         ack_policy = *ieee80211_get_qos_ctl(hdr) &
 904                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
 905         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 906
 907         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
 908         if (!tid_agg_rx)
 909                 goto dont_reorder;
 910
 911         /* qos null data frames are excluded */
 912         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
 913                 goto dont_reorder;
 914
 915         /* not part of a BA session */
 916         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
 917             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
 918                 goto dont_reorder;
 919
 920         /* not actually part of this BA session */
 921         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
 922                 goto dont_reorder;
 923
 924         /* new, potentially un-ordered, ampdu frame - process it */
 925
 926         /* reset session timer */
 927         if (tid_agg_rx->timeout)
 928                 tid_agg_rx->last_rx = jiffies;
 929
 930         /* if this mpdu is fragmented - terminate rx aggregation session */
 931         sc = le16_to_cpu(hdr->seq_ctrl);
 932         if (sc & IEEE80211_SCTL_FRAG) {
 933                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 934                 skb_queue_tail(&rx->sdata->skb_queue, skb);
 935                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
 936                 return;
 937         }
 938
 939         /*
 940          * No locking needed -- we will only ever process one
 941          * RX packet at a time, and thus own tid_agg_rx. All
 942          * other code manipulating it needs to (and does) make
 943          * sure that we cannot get to it any more before doing
 944          * anything with it.
 945          */
 946         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
 947                                              frames))
 948                 return;
 949
 950  dont_reorder:
 951         __skb_queue_tail(frames, skb);
 952 }
 953
 954 static ieee80211_rx_result debug_noinline
 955 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 956 {
 957         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 958         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 959
 960         /*
 961          * Drop duplicate 802.11 retransmissions
 962          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 963          */
 964         if (rx->skb->len >= 24 && rx->sta &&
 965             !ieee80211_is_ctl(hdr->frame_control) &&
 966             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
 967             !is_multicast_ether_addr(hdr->addr1)) {
 968                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 969                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
 970                              hdr->seq_ctrl)) {
 971                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
 972                                 rx->local->dot11FrameDuplicateCount++;
 973                                 rx->sta->num_duplicates++;
 974                         }
 975                         return RX_DROP_UNUSABLE;
 976                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 977                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 978                 }
 979         }
 980
 981         if (unlikely(rx->skb->len < 16)) {
 982                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
 983                 return RX_DROP_MONITOR;
 984         }
 985
 986         /* Drop disallowed frame classes based on STA auth/assoc state;
 987          * IEEE 802.11, Chap 5.5.
 988          *
 989          * mac80211 filters only based on association state, i.e. it drops
 990          * Class 3 frames from not associated stations. hostapd sends
 991          * deauth/disassoc frames when needed. In addition, hostapd is
 992          * responsible for filtering on both auth and assoc states.
 993          */
 994
 995         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 996                 return ieee80211_rx_mesh_check(rx);
 997
 998         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 999                       ieee80211_is_pspoll(hdr->frame_control)) &&
1000                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1001                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1002                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1003                 /*
1004                  * accept port control frames from the AP even when it's not
1005                  * yet marked ASSOC to prevent a race where we don't set the
1006                  * assoc bit quickly enough before it sends the first frame
1007                  */
1008                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1009                     ieee80211_is_data_present(hdr->frame_control)) {
1010                         unsigned int hdrlen;
1011                         __be16 ethertype;
1012
1013                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1014
1015                         if (rx->skb->len < hdrlen + 8)
1016                                 return RX_DROP_MONITOR;
1017
1018                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1019                         if (ethertype == rx->sdata->control_port_protocol)
1020                                 return RX_CONTINUE;
1021                 }
1022
1023                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1024                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1025                                                hdr->addr2,
1026                                                GFP_ATOMIC))
1027                         return RX_DROP_UNUSABLE;
1028
1029                 return RX_DROP_MONITOR;
1030         }
1031
1032         return RX_CONTINUE;
1033 }
1034
1035
1036 static ieee80211_rx_result debug_noinline
1037 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1038 {
1039         struct ieee80211_local *local;
1040         struct ieee80211_hdr *hdr;
1041         struct sk_buff *skb;
1042
1043         local = rx->local;
1044         skb = rx->skb;
1045         hdr = (struct ieee80211_hdr *) skb->data;
1046
1047         if (!local->pspolling)
1048                 return RX_CONTINUE;
1049
1050         if (!ieee80211_has_fromds(hdr->frame_control))
1051                 /* this is not from AP */
1052                 return RX_CONTINUE;
1053
1054         if (!ieee80211_is_data(hdr->frame_control))
1055                 return RX_CONTINUE;
1056
1057         if (!ieee80211_has_moredata(hdr->frame_control)) {
1058                 /* AP has no more frames buffered for us */
1059                 local->pspolling = false;
1060                 return RX_CONTINUE;
1061         }
1062
1063         /* more data bit is set, let's request a new frame from the AP */
1064         ieee80211_send_pspoll(local, rx->sdata);
1065
1066         return RX_CONTINUE;
1067 }
1068
1069 static void sta_ps_start(struct sta_info *sta)
1070 {
1071         struct ieee80211_sub_if_data *sdata = sta->sdata;
1072         struct ieee80211_local *local = sdata->local;
1073         struct ps_data *ps;
1074
1075         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1076             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1077                 ps = &sdata->bss->ps;
1078         else
1079                 return;
1080
1081         atomic_inc(&ps->num_sta_ps);
1082         set_sta_flag(sta, WLAN_STA_PS_STA);
1083         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1084                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1085         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1086                sta->sta.addr, sta->sta.aid);
1087 }
1088
1089 static void sta_ps_end(struct sta_info *sta)
1090 {
1091         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1092                sta->sta.addr, sta->sta.aid);
1093
1094         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1095                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1096                        sta->sta.addr, sta->sta.aid);
1097                 return;
1098         }
1099
1100         ieee80211_sta_ps_deliver_wakeup(sta);
1101 }
1102
1103 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1104 {
1105         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1106         bool in_ps;
1107
1108         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1109
1110         /* Don't let the same PS state be set twice */
1111         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1112         if ((start && in_ps) || (!start && !in_ps))
1113                 return -EINVAL;
1114
1115         if (start)
1116                 sta_ps_start(sta_inf);
1117         else
1118                 sta_ps_end(sta_inf);
1119
1120         return 0;
1121 }
1122 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1123
1124 static ieee80211_rx_result debug_noinline
1125 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1126 {
1127         struct ieee80211_sub_if_data *sdata = rx->sdata;
1128         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1129         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1130         int tid, ac;
1131
1132         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1133                 return RX_CONTINUE;
1134
1135         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1136             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1137                 return RX_CONTINUE;
1138
1139         /*
1140          * The device handles station powersave, so don't do anything about
1141          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1142          * it to mac80211 since they're handled.)
1143          */
1144         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1145                 return RX_CONTINUE;
1146
1147         /*
1148          * Don't do anything if the station isn't already asleep. In
1149          * the uAPSD case, the station will probably be marked asleep,
1150          * in the PS-Poll case the station must be confused ...
1151          */
1152         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1153                 return RX_CONTINUE;
1154
1155         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1156                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1157                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1158                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1159                         else
1160                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1161                 }
1162
1163                 /* Free PS Poll skb here instead of returning RX_DROP that would
1164                  * count as an dropped frame. */
1165                 dev_kfree_skb(rx->skb);
1166
1167                 return RX_QUEUED;
1168         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1169                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1170                    ieee80211_has_pm(hdr->frame_control) &&
1171                    (ieee80211_is_data_qos(hdr->frame_control) ||
1172                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1173                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1174                 ac = ieee802_1d_to_ac[tid & 7];
1175
1176                 /*
1177                  * If this AC is not trigger-enabled do nothing.
1178                  *
1179                  * NB: This could/should check a separate bitmap of trigger-
1180                  * enabled queues, but for now we only implement uAPSD w/o
1181                  * TSPEC changes to the ACs, so they're always the same.
1182                  */
1183                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1184                         return RX_CONTINUE;
1185
1186                 /* if we are in a service period, do nothing */
1187                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1188                         return RX_CONTINUE;
1189
1190                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1191                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1192                 else
1193                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1194         }
1195
1196         return RX_CONTINUE;
1197 }
1198
1199 static ieee80211_rx_result debug_noinline
1200 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1201 {
1202         struct sta_info *sta = rx->sta;
1203         struct sk_buff *skb = rx->skb;
1204         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1205         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1206         int i;
1207
1208         if (!sta)
1209                 return RX_CONTINUE;
1210
1211         /*
1212          * Update last_rx only for IBSS packets which are for the current
1213          * BSSID and for station already AUTHORIZED to avoid keeping the
1214          * current IBSS network alive in cases where other STAs start
1215          * using different BSSID. This will also give the station another
1216          * chance to restart the authentication/authorization in case
1217          * something went wrong the first time.
1218          */
1219         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1220                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1221                                                 NL80211_IFTYPE_ADHOC);
1222                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1223                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1224                         sta->last_rx = jiffies;
1225                         if (ieee80211_is_data(hdr->frame_control)) {
1226                                 sta->last_rx_rate_idx = status->rate_idx;
1227                                 sta->last_rx_rate_flag = status->flag;
1228                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1229                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1230                         }
1231                 }
1232         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1233                 /*
1234                  * Mesh beacons will update last_rx when if they are found to
1235                  * match the current local configuration when processed.
1236                  */
1237                 sta->last_rx = jiffies;
1238                 if (ieee80211_is_data(hdr->frame_control)) {
1239                         sta->last_rx_rate_idx = status->rate_idx;
1240                         sta->last_rx_rate_flag = status->flag;
1241                         sta->last_rx_rate_vht_nss = status->vht_nss;
1242                 }
1243         }
1244
1245         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1246                 return RX_CONTINUE;
1247
1248         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1249                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1250
1251         sta->rx_fragments++;
1252         sta->rx_bytes += rx->skb->len;
1253         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1254                 sta->last_signal = status->signal;
1255                 ewma_add(&sta->avg_signal, -status->signal);
1256         }
1257
1258         if (status->chains) {
1259                 sta->chains = status->chains;
1260                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1261                         int signal = status->chain_signal[i];
1262
1263                         if (!(status->chains & BIT(i)))
1264                                 continue;
1265
1266                         sta->chain_signal_last[i] = signal;
1267                         ewma_add(&sta->chain_signal_avg[i], -signal);
1268                 }
1269         }
1270
1271         /*
1272          * Change STA power saving mode only at the end of a frame
1273          * exchange sequence.
1274          */
1275         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1276             !ieee80211_has_morefrags(hdr->frame_control) &&
1277             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1278             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1279              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1280             /* PM bit is only checked in frames where it isn't reserved,
1281              * in AP mode it's reserved in non-bufferable management frames
1282              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1283              */
1284             (!ieee80211_is_mgmt(hdr->frame_control) ||
1285              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1286                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1287                         if (!ieee80211_has_pm(hdr->frame_control))
1288                                 sta_ps_end(sta);
1289                 } else {
1290                         if (ieee80211_has_pm(hdr->frame_control))
1291                                 sta_ps_start(sta);
1292                 }
1293         }
1294
1295         /* mesh power save support */
1296         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1297                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1298
1299         /*
1300          * Drop (qos-)data::nullfunc frames silently, since they
1301          * are used only to control station power saving mode.
1302          */
1303         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1304             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1305                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1306
1307                 /*
1308                  * If we receive a 4-addr nullfunc frame from a STA
1309                  * that was not moved to a 4-addr STA vlan yet send
1310                  * the event to userspace and for older hostapd drop
1311                  * the frame to the monitor interface.
1312                  */
1313                 if (ieee80211_has_a4(hdr->frame_control) &&
1314                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1315                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1316                       !rx->sdata->u.vlan.sta))) {
1317                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1318                                 cfg80211_rx_unexpected_4addr_frame(
1319                                         rx->sdata->dev, sta->sta.addr,
1320                                         GFP_ATOMIC);
1321                         return RX_DROP_MONITOR;
1322                 }
1323                 /*
1324                  * Update counter and free packet here to avoid
1325                  * counting this as a dropped packed.
1326                  */
1327                 sta->rx_packets++;
1328                 dev_kfree_skb(rx->skb);
1329                 return RX_QUEUED;
1330         }
1331
1332         return RX_CONTINUE;
1333 } /* ieee80211_rx_h_sta_process */
1334
1335 static ieee80211_rx_result debug_noinline
1336 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1337 {
1338         struct sk_buff *skb = rx->skb;
1339         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1340         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1341         int keyidx;
1342         int hdrlen;
1343         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1344         struct ieee80211_key *sta_ptk = NULL;
1345         int mmie_keyidx = -1;
1346         __le16 fc;
1347         const struct ieee80211_cipher_scheme *cs = NULL;
1348
1349         /*
1350          * Key selection 101
1351          *
1352          * There are four types of keys:
1353          *  - GTK (group keys)
1354          *  - IGTK (group keys for management frames)
1355          *  - PTK (pairwise keys)
1356          *  - STK (station-to-station pairwise keys)
1357          *
1358          * When selecting a key, we have to distinguish between multicast
1359          * (including broadcast) and unicast frames, the latter can only
1360          * use PTKs and STKs while the former always use GTKs and IGTKs.
1361          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1362          * unicast frames can also use key indices like GTKs. Hence, if we
1363          * don't have a PTK/STK we check the key index for a WEP key.
1364          *
1365          * Note that in a regular BSS, multicast frames are sent by the
1366          * AP only, associated stations unicast the frame to the AP first
1367          * which then multicasts it on their behalf.
1368          *
1369          * There is also a slight problem in IBSS mode: GTKs are negotiated
1370          * with each station, that is something we don't currently handle.
1371          * The spec seems to expect that one negotiates the same key with
1372          * every station but there's no such requirement; VLANs could be
1373          * possible.
1374          */
1375
1376         /*
1377          * No point in finding a key and decrypting if the frame is neither
1378          * addressed to us nor a multicast frame.
1379          */
1380         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1381                 return RX_CONTINUE;
1382
1383         /* start without a key */
1384         rx->key = NULL;
1385         fc = hdr->frame_control;
1386
1387         if (rx->sta) {
1388                 int keyid = rx->sta->ptk_idx;
1389
1390                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1391                         cs = rx->sta->cipher_scheme;
1392                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1393                         if (unlikely(keyid < 0))
1394                                 return RX_DROP_UNUSABLE;
1395                 }
1396                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1397         }
1398
1399         if (!ieee80211_has_protected(fc))
1400                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1401
1402         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1403                 rx->key = sta_ptk;
1404                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1405                     (status->flag & RX_FLAG_IV_STRIPPED))
1406                         return RX_CONTINUE;
1407                 /* Skip decryption if the frame is not protected. */
1408                 if (!ieee80211_has_protected(fc))
1409                         return RX_CONTINUE;
1410         } else if (mmie_keyidx >= 0) {
1411                 /* Broadcast/multicast robust management frame / BIP */
1412                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1413                     (status->flag & RX_FLAG_IV_STRIPPED))
1414                         return RX_CONTINUE;
1415
1416                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1417                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1418                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1419                 if (rx->sta)
1420                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1421                 if (!rx->key)
1422                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1423         } else if (!ieee80211_has_protected(fc)) {
1424                 /*
1425                  * The frame was not protected, so skip decryption. However, we
1426                  * need to set rx->key if there is a key that could have been
1427                  * used so that the frame may be dropped if encryption would
1428                  * have been expected.
1429                  */
1430                 struct ieee80211_key *key = NULL;
1431                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1432                 int i;
1433
1434                 if (ieee80211_is_mgmt(fc) &&
1435                     is_multicast_ether_addr(hdr->addr1) &&
1436                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1437                         rx->key = key;
1438                 else {
1439                         if (rx->sta) {
1440                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1441                                         key = rcu_dereference(rx->sta->gtk[i]);
1442                                         if (key)
1443                                                 break;
1444                                 }
1445                         }
1446                         if (!key) {
1447                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1448                                         key = rcu_dereference(sdata->keys[i]);
1449                                         if (key)
1450                                                 break;
1451                                 }
1452                         }
1453                         if (key)
1454                                 rx->key = key;
1455                 }
1456                 return RX_CONTINUE;
1457         } else {
1458                 u8 keyid;
1459
1460                 /*
1461                  * The device doesn't give us the IV so we won't be
1462                  * able to look up the key. That's ok though, we
1463                  * don't need to decrypt the frame, we just won't
1464                  * be able to keep statistics accurate.
1465                  * Except for key threshold notifications, should
1466                  * we somehow allow the driver to tell us which key
1467                  * the hardware used if this flag is set?
1468                  */
1469                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1470                     (status->flag & RX_FLAG_IV_STRIPPED))
1471                         return RX_CONTINUE;
1472
1473                 hdrlen = ieee80211_hdrlen(fc);
1474
1475                 if (cs) {
1476                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1477
1478                         if (unlikely(keyidx < 0))
1479                                 return RX_DROP_UNUSABLE;
1480                 } else {
1481                         if (rx->skb->len < 8 + hdrlen)
1482                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1483                         /*
1484                          * no need to call ieee80211_wep_get_keyidx,
1485                          * it verifies a bunch of things we've done already
1486                          */
1487                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1488                         keyidx = keyid >> 6;
1489                 }
1490
1491                 /* check per-station GTK first, if multicast packet */
1492                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1493                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1494
1495                 /* if not found, try default key */
1496                 if (!rx->key) {
1497                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1498
1499                         /*
1500                          * RSNA-protected unicast frames should always be
1501                          * sent with pairwise or station-to-station keys,
1502                          * but for WEP we allow using a key index as well.
1503                          */
1504                         if (rx->key &&
1505                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1506                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1507                             !is_multicast_ether_addr(hdr->addr1))
1508                                 rx->key = NULL;
1509                 }
1510         }
1511
1512         if (rx->key) {
1513                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1514                         return RX_DROP_MONITOR;
1515
1516                 rx->key->tx_rx_count++;
1517                 /* TODO: add threshold stuff again */
1518         } else {
1519                 return RX_DROP_MONITOR;
1520         }
1521
1522         switch (rx->key->conf.cipher) {
1523         case WLAN_CIPHER_SUITE_WEP40:
1524         case WLAN_CIPHER_SUITE_WEP104:
1525                 result = ieee80211_crypto_wep_decrypt(rx);
1526                 break;
1527         case WLAN_CIPHER_SUITE_TKIP:
1528                 result = ieee80211_crypto_tkip_decrypt(rx);
1529                 break;
1530         case WLAN_CIPHER_SUITE_CCMP:
1531                 result = ieee80211_crypto_ccmp_decrypt(rx);
1532                 break;
1533         case WLAN_CIPHER_SUITE_AES_CMAC:
1534                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1535                 break;
1536         default:
1537                 result = ieee80211_crypto_hw_decrypt(rx);
1538         }
1539
1540         /* the hdr variable is invalid after the decrypt handlers */
1541
1542         /* either the frame has been decrypted or will be dropped */
1543         status->flag |= RX_FLAG_DECRYPTED;
1544
1545         return result;
1546 }
1547
1548 static inline struct ieee80211_fragment_entry *
1549 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1550                          unsigned int frag, unsigned int seq, int rx_queue,
1551                          struct sk_buff **skb)
1552 {
1553         struct ieee80211_fragment_entry *entry;
1554
1555         entry = &sdata->fragments[sdata->fragment_next++];
1556         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1557                 sdata->fragment_next = 0;
1558
1559         if (!skb_queue_empty(&entry->skb_list))
1560                 __skb_queue_purge(&entry->skb_list);
1561
1562         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1563         *skb = NULL;
1564         entry->first_frag_time = jiffies;
1565         entry->seq = seq;
1566         entry->rx_queue = rx_queue;
1567         entry->last_frag = frag;
1568         entry->ccmp = 0;
1569         entry->extra_len = 0;
1570
1571         return entry;
1572 }
1573
1574 static inline struct ieee80211_fragment_entry *
1575 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1576                           unsigned int frag, unsigned int seq,
1577                           int rx_queue, struct ieee80211_hdr *hdr)
1578 {
1579         struct ieee80211_fragment_entry *entry;
1580         int i, idx;
1581
1582         idx = sdata->fragment_next;
1583         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1584                 struct ieee80211_hdr *f_hdr;
1585
1586                 idx--;
1587                 if (idx < 0)
1588                         idx = IEEE80211_FRAGMENT_MAX - 1;
1589
1590                 entry = &sdata->fragments[idx];
1591                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1592                     entry->rx_queue != rx_queue ||
1593                     entry->last_frag + 1 != frag)
1594                         continue;
1595
1596                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1597
1598                 /*
1599                  * Check ftype and addresses are equal, else check next fragment
1600                  */
1601                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1602                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1603                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1604                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1605                         continue;
1606
1607                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1608                         __skb_queue_purge(&entry->skb_list);
1609                         continue;
1610                 }
1611                 return entry;
1612         }
1613
1614         return NULL;
1615 }
1616
1617 static ieee80211_rx_result debug_noinline
1618 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1619 {
1620         struct ieee80211_hdr *hdr;
1621         u16 sc;
1622         __le16 fc;
1623         unsigned int frag, seq;
1624         struct ieee80211_fragment_entry *entry;
1625         struct sk_buff *skb;
1626         struct ieee80211_rx_status *status;
1627
1628         hdr = (struct ieee80211_hdr *)rx->skb->data;
1629         fc = hdr->frame_control;
1630
1631         if (ieee80211_is_ctl(fc))
1632                 return RX_CONTINUE;
1633
1634         sc = le16_to_cpu(hdr->seq_ctrl);
1635         frag = sc & IEEE80211_SCTL_FRAG;
1636
1637         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1638                    is_multicast_ether_addr(hdr->addr1))) {
1639                 /* not fragmented */
1640                 goto out;
1641         }
1642         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1643
1644         if (skb_linearize(rx->skb))
1645                 return RX_DROP_UNUSABLE;
1646
1647         /*
1648          *  skb_linearize() might change the skb->data and
1649          *  previously cached variables (in this case, hdr) need to
1650          *  be refreshed with the new data.
1651          */
1652         hdr = (struct ieee80211_hdr *)rx->skb->data;
1653         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1654
1655         if (frag == 0) {
1656                 /* This is the first fragment of a new frame. */
1657                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1658                                                  rx->seqno_idx, &(rx->skb));
1659                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1660                     ieee80211_has_protected(fc)) {
1661                         int queue = rx->security_idx;
1662                         /* Store CCMP PN so that we can verify that the next
1663                          * fragment has a sequential PN value. */
1664                         entry->ccmp = 1;
1665                         memcpy(entry->last_pn,
1666                                rx->key->u.ccmp.rx_pn[queue],
1667                                IEEE80211_CCMP_PN_LEN);
1668                 }
1669                 return RX_QUEUED;
1670         }
1671
1672         /* This is a fragment for a frame that should already be pending in
1673          * fragment cache. Add this fragment to the end of the pending entry.
1674          */
1675         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1676                                           rx->seqno_idx, hdr);
1677         if (!entry) {
1678                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1679                 return RX_DROP_MONITOR;
1680         }
1681
1682         /* Verify that MPDUs within one MSDU have sequential PN values.
1683          * (IEEE 802.11i, 8.3.3.4.5) */
1684         if (entry->ccmp) {
1685                 int i;
1686                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1687                 int queue;
1688                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1689                         return RX_DROP_UNUSABLE;
1690                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1691                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1692                         pn[i]++;
1693                         if (pn[i])
1694                                 break;
1695                 }
1696                 queue = rx->security_idx;
1697                 rpn = rx->key->u.ccmp.rx_pn[queue];
1698                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1699                         return RX_DROP_UNUSABLE;
1700                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1701         }
1702
1703         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1704         __skb_queue_tail(&entry->skb_list, rx->skb);
1705         entry->last_frag = frag;
1706         entry->extra_len += rx->skb->len;
1707         if (ieee80211_has_morefrags(fc)) {
1708                 rx->skb = NULL;
1709                 return RX_QUEUED;
1710         }
1711
1712         rx->skb = __skb_dequeue(&entry->skb_list);
1713         if (skb_tailroom(rx->skb) < entry->extra_len) {
1714                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1715                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1716                                               GFP_ATOMIC))) {
1717                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1718                         __skb_queue_purge(&entry->skb_list);
1719                         return RX_DROP_UNUSABLE;
1720                 }
1721         }
1722         while ((skb = __skb_dequeue(&entry->skb_list))) {
1723                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1724                 dev_kfree_skb(skb);
1725         }
1726
1727         /* Complete frame has been reassembled - process it now */
1728         status = IEEE80211_SKB_RXCB(rx->skb);
1729         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1730
1731  out:
1732         if (rx->sta)
1733                 rx->sta->rx_packets++;
1734         if (is_multicast_ether_addr(hdr->addr1))
1735                 rx->local->dot11MulticastReceivedFrameCount++;
1736         else
1737                 ieee80211_led_rx(rx->local);
1738         return RX_CONTINUE;
1739 }
1740
1741 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1742 {
1743         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1744                 return -EACCES;
1745
1746         return 0;
1747 }
1748
1749 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1750 {
1751         struct sk_buff *skb = rx->skb;
1752         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1753
1754         /*
1755          * Pass through unencrypted frames if the hardware has
1756          * decrypted them already.
1757          */
1758         if (status->flag & RX_FLAG_DECRYPTED)
1759                 return 0;
1760
1761         /* Drop unencrypted frames if key is set. */
1762         if (unlikely(!ieee80211_has_protected(fc) &&
1763                      !ieee80211_is_nullfunc(fc) &&
1764                      ieee80211_is_data(fc) &&
1765                      (rx->key || rx->sdata->drop_unencrypted)))
1766                 return -EACCES;
1767
1768         return 0;
1769 }
1770
1771 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1772 {
1773         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1774         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1775         __le16 fc = hdr->frame_control;
1776
1777         /*
1778          * Pass through unencrypted frames if the hardware has
1779          * decrypted them already.
1780          */
1781         if (status->flag & RX_FLAG_DECRYPTED)
1782                 return 0;
1783
1784         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1785                 if (unlikely(!ieee80211_has_protected(fc) &&
1786                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1787                              rx->key)) {
1788                         if (ieee80211_is_deauth(fc) ||
1789                             ieee80211_is_disassoc(fc))
1790                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1791                                                              rx->skb->data,
1792                                                              rx->skb->len);
1793                         return -EACCES;
1794                 }
1795                 /* BIP does not use Protected field, so need to check MMIE */
1796                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1797                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1798                         if (ieee80211_is_deauth(fc) ||
1799                             ieee80211_is_disassoc(fc))
1800                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1801                                                              rx->skb->data,
1802                                                              rx->skb->len);
1803                         return -EACCES;
1804                 }
1805                 /*
1806                  * When using MFP, Action frames are not allowed prior to
1807                  * having configured keys.
1808                  */
1809                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1810                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1811                         return -EACCES;
1812         }
1813
1814         return 0;
1815 }
1816
1817 static int
1818 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1819 {
1820         struct ieee80211_sub_if_data *sdata = rx->sdata;
1821         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1822         bool check_port_control = false;
1823         struct ethhdr *ehdr;
1824         int ret;
1825
1826         *port_control = false;
1827         if (ieee80211_has_a4(hdr->frame_control) &&
1828             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1829                 return -1;
1830
1831         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1832             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1833
1834                 if (!sdata->u.mgd.use_4addr)
1835                         return -1;
1836                 else
1837                         check_port_control = true;
1838         }
1839
1840         if (is_multicast_ether_addr(hdr->addr1) &&
1841             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1842                 return -1;
1843
1844         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1845         if (ret < 0)
1846                 return ret;
1847
1848         ehdr = (struct ethhdr *) rx->skb->data;
1849         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1850                 *port_control = true;
1851         else if (check_port_control)
1852                 return -1;
1853
1854         return 0;
1855 }
1856
1857 /*
1858  * requires that rx->skb is a frame with ethernet header
1859  */
1860 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1861 {
1862         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1863                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1864         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1865
1866         /*
1867          * Allow EAPOL frames to us/the PAE group address regardless
1868          * of whether the frame was encrypted or not.
1869          */
1870         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1871             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1872              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1873                 return true;
1874
1875         if (ieee80211_802_1x_port_control(rx) ||
1876             ieee80211_drop_unencrypted(rx, fc))
1877                 return false;
1878
1879         return true;
1880 }
1881
1882 /*
1883  * requires that rx->skb is a frame with ethernet header
1884  */
1885 static void
1886 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1887 {
1888         struct ieee80211_sub_if_data *sdata = rx->sdata;
1889         struct net_device *dev = sdata->dev;
1890         struct sk_buff *skb, *xmit_skb;
1891         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1892         struct sta_info *dsta;
1893         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1894
1895         skb = rx->skb;
1896         xmit_skb = NULL;
1897
1898         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1899              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1900             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1901             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1902             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1903                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1904                         /*
1905                          * send multicast frames both to higher layers in
1906                          * local net stack and back to the wireless medium
1907                          */
1908                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1909                         if (!xmit_skb)
1910                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1911                                                     dev->name);
1912                 } else {
1913                         dsta = sta_info_get(sdata, skb->data);
1914                         if (dsta) {
1915                                 /*
1916                                  * The destination station is associated to
1917                                  * this AP (in this VLAN), so send the frame
1918                                  * directly to it and do not pass it to local
1919                                  * net stack.
1920                                  */
1921                                 xmit_skb = skb;
1922                                 skb = NULL;
1923                         }
1924                 }
1925         }
1926
1927 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1928         if (skb) {
1929                 /* 'align' will only take the values 0 or 2 here since all
1930                  * frames are required to be aligned to 2-byte boundaries
1931                  * when being passed to mac80211; the code here works just
1932                  * as well if that isn't true, but mac80211 assumes it can
1933                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1934                  */
1935                 int align;
1936
1937                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1938                 if (align) {
1939                         if (WARN_ON(skb_headroom(skb) < 3)) {
1940                                 dev_kfree_skb(skb);
1941                                 skb = NULL;
1942                         } else {
1943                                 u8 *data = skb->data;
1944                                 size_t len = skb_headlen(skb);
1945                                 skb->data -= align;
1946                                 memmove(skb->data, data, len);
1947                                 skb_set_tail_pointer(skb, len);
1948                         }
1949                 }
1950         }
1951 #endif
1952
1953         if (skb) {
1954                 /* deliver to local stack */
1955                 skb->protocol = eth_type_trans(skb, dev);
1956                 memset(skb->cb, 0, sizeof(skb->cb));
1957                 netif_receive_skb(skb);
1958         }
1959
1960         if (xmit_skb) {
1961                 /*
1962                  * Send to wireless media and increase priority by 256 to
1963                  * keep the received priority instead of reclassifying
1964                  * the frame (see cfg80211_classify8021d).
1965                  */
1966                 xmit_skb->priority += 256;
1967                 xmit_skb->protocol = htons(ETH_P_802_3);
1968                 skb_reset_network_header(xmit_skb);
1969                 skb_reset_mac_header(xmit_skb);
1970                 dev_queue_xmit(xmit_skb);
1971         }
1972 }
1973
1974 static ieee80211_rx_result debug_noinline
1975 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1976 {
1977         struct net_device *dev = rx->sdata->dev;
1978         struct sk_buff *skb = rx->skb;
1979         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1980         __le16 fc = hdr->frame_control;
1981         struct sk_buff_head frame_list;
1982         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1983
1984         if (unlikely(!ieee80211_is_data(fc)))
1985                 return RX_CONTINUE;
1986
1987         if (unlikely(!ieee80211_is_data_present(fc)))
1988                 return RX_DROP_MONITOR;
1989
1990         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1991                 return RX_CONTINUE;
1992
1993         if (ieee80211_has_a4(hdr->frame_control) &&
1994             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1995             !rx->sdata->u.vlan.sta)
1996                 return RX_DROP_UNUSABLE;
1997
1998         if (is_multicast_ether_addr(hdr->addr1) &&
1999             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2000               rx->sdata->u.vlan.sta) ||
2001              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2002               rx->sdata->u.mgd.use_4addr)))
2003                 return RX_DROP_UNUSABLE;
2004
2005         skb->dev = dev;
2006         __skb_queue_head_init(&frame_list);
2007
2008         if (skb_linearize(skb))
2009                 return RX_DROP_UNUSABLE;
2010
2011         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2012                                  rx->sdata->vif.type,
2013                                  rx->local->hw.extra_tx_headroom, true);
2014
2015         while (!skb_queue_empty(&frame_list)) {
2016                 rx->skb = __skb_dequeue(&frame_list);
2017
2018                 if (!ieee80211_frame_allowed(rx, fc)) {
2019                         dev_kfree_skb(rx->skb);
2020                         continue;
2021                 }
2022                 dev->stats.rx_packets++;
2023                 dev->stats.rx_bytes += rx->skb->len;
2024
2025                 ieee80211_deliver_skb(rx);
2026         }
2027
2028         return RX_QUEUED;
2029 }
2030
2031 #ifdef CONFIG_MAC80211_MESH
2032 static ieee80211_rx_result
2033 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2034 {
2035         struct ieee80211_hdr *fwd_hdr, *hdr;
2036         struct ieee80211_tx_info *info;
2037         struct ieee80211s_hdr *mesh_hdr;
2038         struct sk_buff *skb = rx->skb, *fwd_skb;
2039         struct ieee80211_local *local = rx->local;
2040         struct ieee80211_sub_if_data *sdata = rx->sdata;
2041         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2042         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2043         u16 q, hdrlen;
2044
2045         hdr = (struct ieee80211_hdr *) skb->data;
2046         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2047
2048         /* make sure fixed part of mesh header is there, also checks skb len */
2049         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2050                 return RX_DROP_MONITOR;
2051
2052         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2053
2054         /* make sure full mesh header is there, also checks skb len */
2055         if (!pskb_may_pull(rx->skb,
2056                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2057                 return RX_DROP_MONITOR;
2058
2059         /* reload pointers */
2060         hdr = (struct ieee80211_hdr *) skb->data;
2061         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2062
2063         /* frame is in RMC, don't forward */
2064         if (ieee80211_is_data(hdr->frame_control) &&
2065             is_multicast_ether_addr(hdr->addr1) &&
2066             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2067                 return RX_DROP_MONITOR;
2068
2069         if (!ieee80211_is_data(hdr->frame_control) ||
2070             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2071                 return RX_CONTINUE;
2072
2073         if (!mesh_hdr->ttl)
2074                 return RX_DROP_MONITOR;
2075
2076         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2077                 struct mesh_path *mppath;
2078                 char *proxied_addr;
2079                 char *mpp_addr;
2080
2081                 if (is_multicast_ether_addr(hdr->addr1)) {
2082                         mpp_addr = hdr->addr3;
2083                         proxied_addr = mesh_hdr->eaddr1;
2084                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2085                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2086                         mpp_addr = hdr->addr4;
2087                         proxied_addr = mesh_hdr->eaddr2;
2088                 } else {
2089                         return RX_DROP_MONITOR;
2090                 }
2091
2092                 rcu_read_lock();
2093                 mppath = mpp_path_lookup(sdata, proxied_addr);
2094                 if (!mppath) {
2095                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2096                 } else {
2097                         spin_lock_bh(&mppath->state_lock);
2098                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2099                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2100                         spin_unlock_bh(&mppath->state_lock);
2101                 }
2102                 rcu_read_unlock();
2103         }
2104
2105         /* Frame has reached destination.  Don't forward */
2106         if (!is_multicast_ether_addr(hdr->addr1) &&
2107             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2108                 return RX_CONTINUE;
2109
2110         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2111         if (ieee80211_queue_stopped(&local->hw, q)) {
2112                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2113                 return RX_DROP_MONITOR;
2114         }
2115         skb_set_queue_mapping(skb, q);
2116
2117         if (!--mesh_hdr->ttl) {
2118                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2119                 goto out;
2120         }
2121
2122         if (!ifmsh->mshcfg.dot11MeshForwarding)
2123                 goto out;
2124
2125         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2126         if (!fwd_skb) {
2127                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2128                                     sdata->name);
2129                 goto out;
2130         }
2131
2132         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2133         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2134         info = IEEE80211_SKB_CB(fwd_skb);
2135         memset(info, 0, sizeof(*info));
2136         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2137         info->control.vif = &rx->sdata->vif;
2138         info->control.jiffies = jiffies;
2139         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2140                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2141                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2142                 /* update power mode indication when forwarding */
2143                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2144         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2145                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2146                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2147         } else {
2148                 /* unable to resolve next hop */
2149                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2150                                    fwd_hdr->addr3, 0,
2151                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2152                                    fwd_hdr->addr2);
2153                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2154                 kfree_skb(fwd_skb);
2155                 return RX_DROP_MONITOR;
2156         }
2157
2158         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2159         ieee80211_add_pending_skb(local, fwd_skb);
2160  out:
2161         if (is_multicast_ether_addr(hdr->addr1) ||
2162             sdata->dev->flags & IFF_PROMISC)
2163                 return RX_CONTINUE;
2164         else
2165                 return RX_DROP_MONITOR;
2166 }
2167 #endif
2168
2169 static ieee80211_rx_result debug_noinline
2170 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2171 {
2172         struct ieee80211_sub_if_data *sdata = rx->sdata;
2173         struct ieee80211_local *local = rx->local;
2174         struct net_device *dev = sdata->dev;
2175         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2176         __le16 fc = hdr->frame_control;
2177         bool port_control;
2178         int err;
2179
2180         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2181                 return RX_CONTINUE;
2182
2183         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2184                 return RX_DROP_MONITOR;
2185
2186         /*
2187          * Send unexpected-4addr-frame event to hostapd. For older versions,
2188          * also drop the frame to cooked monitor interfaces.
2189          */
2190         if (ieee80211_has_a4(hdr->frame_control) &&
2191             sdata->vif.type == NL80211_IFTYPE_AP) {
2192                 if (rx->sta &&
2193                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2194                         cfg80211_rx_unexpected_4addr_frame(
2195                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2196                 return RX_DROP_MONITOR;
2197         }
2198
2199         err = __ieee80211_data_to_8023(rx, &port_control);
2200         if (unlikely(err))
2201                 return RX_DROP_UNUSABLE;
2202
2203         if (!ieee80211_frame_allowed(rx, fc))
2204                 return RX_DROP_MONITOR;
2205
2206         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2207             unlikely(port_control) && sdata->bss) {
2208                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2209                                      u.ap);
2210                 dev = sdata->dev;
2211                 rx->sdata = sdata;
2212         }
2213
2214         rx->skb->dev = dev;
2215
2216         dev->stats.rx_packets++;
2217         dev->stats.rx_bytes += rx->skb->len;
2218
2219         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2220             !is_multicast_ether_addr(
2221                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2222             (!local->scanning &&
2223              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2224                         mod_timer(&local->dynamic_ps_timer, jiffies +
2225                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2226         }
2227
2228         ieee80211_deliver_skb(rx);
2229
2230         return RX_QUEUED;
2231 }
2232
2233 static ieee80211_rx_result debug_noinline
2234 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2235 {
2236         struct sk_buff *skb = rx->skb;
2237         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2238         struct tid_ampdu_rx *tid_agg_rx;
2239         u16 start_seq_num;
2240         u16 tid;
2241
2242         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2243                 return RX_CONTINUE;
2244
2245         if (ieee80211_is_back_req(bar->frame_control)) {
2246                 struct {
2247                         __le16 control, start_seq_num;
2248                 } __packed bar_data;
2249
2250                 if (!rx->sta)
2251                         return RX_DROP_MONITOR;
2252
2253                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2254                                   &bar_data, sizeof(bar_data)))
2255                         return RX_DROP_MONITOR;
2256
2257                 tid = le16_to_cpu(bar_data.control) >> 12;
2258
2259                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2260                 if (!tid_agg_rx)
2261                         return RX_DROP_MONITOR;
2262
2263                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2264
2265                 /* reset session timer */
2266                 if (tid_agg_rx->timeout)
2267                         mod_timer(&tid_agg_rx->session_timer,
2268                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2269
2270                 spin_lock(&tid_agg_rx->reorder_lock);
2271                 /* release stored frames up to start of BAR */
2272                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2273                                                  start_seq_num, frames);
2274                 spin_unlock(&tid_agg_rx->reorder_lock);
2275
2276                 kfree_skb(skb);
2277                 return RX_QUEUED;
2278         }
2279
2280         /*
2281          * After this point, we only want management frames,
2282          * so we can drop all remaining control frames to
2283          * cooked monitor interfaces.
2284          */
2285         return RX_DROP_MONITOR;
2286 }
2287
2288 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2289                                            struct ieee80211_mgmt *mgmt,
2290                                            size_t len)
2291 {
2292         struct ieee80211_local *local = sdata->local;
2293         struct sk_buff *skb;
2294         struct ieee80211_mgmt *resp;
2295
2296         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2297                 /* Not to own unicast address */
2298                 return;
2299         }
2300
2301         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2302             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2303                 /* Not from the current AP or not associated yet. */
2304                 return;
2305         }
2306
2307         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2308                 /* Too short SA Query request frame */
2309                 return;
2310         }
2311
2312         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2313         if (skb == NULL)
2314                 return;
2315
2316         skb_reserve(skb, local->hw.extra_tx_headroom);
2317         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2318         memset(resp, 0, 24);
2319         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2320         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2321         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2322         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2323                                           IEEE80211_STYPE_ACTION);
2324         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2325         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2326         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2327         memcpy(resp->u.action.u.sa_query.trans_id,
2328                mgmt->u.action.u.sa_query.trans_id,
2329                WLAN_SA_QUERY_TR_ID_LEN);
2330
2331         ieee80211_tx_skb(sdata, skb);
2332 }
2333
2334 static ieee80211_rx_result debug_noinline
2335 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2336 {
2337         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2338         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2339
2340         /*
2341          * From here on, look only at management frames.
2342          * Data and control frames are already handled,
2343          * and unknown (reserved) frames are useless.
2344          */
2345         if (rx->skb->len < 24)
2346                 return RX_DROP_MONITOR;
2347
2348         if (!ieee80211_is_mgmt(mgmt->frame_control))
2349                 return RX_DROP_MONITOR;
2350
2351         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2352             ieee80211_is_beacon(mgmt->frame_control) &&
2353             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2354                 int sig = 0;
2355
2356                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2357                         sig = status->signal;
2358
2359                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2360                                             rx->skb->data, rx->skb->len,
2361                                             status->freq, sig);
2362                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2363         }
2364
2365         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2366                 return RX_DROP_MONITOR;
2367
2368         if (ieee80211_drop_unencrypted_mgmt(rx))
2369                 return RX_DROP_UNUSABLE;
2370
2371         return RX_CONTINUE;
2372 }
2373
2374 static ieee80211_rx_result debug_noinline
2375 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2376 {
2377         struct ieee80211_local *local = rx->local;
2378         struct ieee80211_sub_if_data *sdata = rx->sdata;
2379         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2380         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2381         int len = rx->skb->len;
2382
2383         if (!ieee80211_is_action(mgmt->frame_control))
2384                 return RX_CONTINUE;
2385
2386         /* drop too small frames */
2387         if (len < IEEE80211_MIN_ACTION_SIZE)
2388                 return RX_DROP_UNUSABLE;
2389
2390         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2391             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2392             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2393                 return RX_DROP_UNUSABLE;
2394
2395         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2396                 return RX_DROP_UNUSABLE;
2397
2398         switch (mgmt->u.action.category) {
2399         case WLAN_CATEGORY_HT:
2400                 /* reject HT action frames from stations not supporting HT */
2401                 if (!rx->sta->sta.ht_cap.ht_supported)
2402                         goto invalid;
2403
2404                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2405                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2406                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2407                     sdata->vif.type != NL80211_IFTYPE_AP &&
2408                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2409                         break;
2410
2411                 /* verify action & smps_control/chanwidth are present */
2412                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2413                         goto invalid;
2414
2415                 switch (mgmt->u.action.u.ht_smps.action) {
2416                 case WLAN_HT_ACTION_SMPS: {
2417                         struct ieee80211_supported_band *sband;
2418                         enum ieee80211_smps_mode smps_mode;
2419
2420                         /* convert to HT capability */
2421                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2422                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2423                                 smps_mode = IEEE80211_SMPS_OFF;
2424                                 break;
2425                         case WLAN_HT_SMPS_CONTROL_STATIC:
2426                                 smps_mode = IEEE80211_SMPS_STATIC;
2427                                 break;
2428                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2429                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2430                                 break;
2431                         default:
2432                                 goto invalid;
2433                         }
2434
2435                         /* if no change do nothing */
2436                         if (rx->sta->sta.smps_mode == smps_mode)
2437                                 goto handled;
2438                         rx->sta->sta.smps_mode = smps_mode;
2439
2440                         sband = rx->local->hw.wiphy->bands[status->band];
2441
2442                         rate_control_rate_update(local, sband, rx->sta,
2443                                                  IEEE80211_RC_SMPS_CHANGED);
2444                         goto handled;
2445                 }
2446                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2447                         struct ieee80211_supported_band *sband;
2448                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2449                         enum ieee80211_sta_rx_bandwidth new_bw;
2450
2451                         /* If it doesn't support 40 MHz it can't change ... */
2452                         if (!(rx->sta->sta.ht_cap.cap &
2453                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2454                                 goto handled;
2455
2456                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2457                                 new_bw = IEEE80211_STA_RX_BW_20;
2458                         else
2459                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2460
2461                         if (rx->sta->sta.bandwidth == new_bw)
2462                                 goto handled;
2463
2464                         sband = rx->local->hw.wiphy->bands[status->band];
2465
2466                         rate_control_rate_update(local, sband, rx->sta,
2467                                                  IEEE80211_RC_BW_CHANGED);
2468                         goto handled;
2469                 }
2470                 default:
2471                         goto invalid;
2472                 }
2473
2474                 break;
2475         case WLAN_CATEGORY_PUBLIC:
2476                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2477                         goto invalid;
2478                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2479                         break;
2480                 if (!rx->sta)
2481                         break;
2482                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2483                         break;
2484                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2485                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2486                         break;
2487                 if (len < offsetof(struct ieee80211_mgmt,
2488                                    u.action.u.ext_chan_switch.variable))
2489                         goto invalid;
2490                 goto queue;
2491         case WLAN_CATEGORY_VHT:
2492                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2493                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2494                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2495                     sdata->vif.type != NL80211_IFTYPE_AP &&
2496                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2497                         break;
2498
2499                 /* verify action code is present */
2500                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2501                         goto invalid;
2502
2503                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2504                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2505                         u8 opmode;
2506
2507                         /* verify opmode is present */
2508                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2509                                 goto invalid;
2510
2511                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2512
2513                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2514                                                     opmode, status->band,
2515                                                     false);
2516                         goto handled;
2517                 }
2518                 default:
2519                         break;
2520                 }
2521                 break;
2522         case WLAN_CATEGORY_BACK:
2523                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2524                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2525                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2526                     sdata->vif.type != NL80211_IFTYPE_AP &&
2527                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2528                         break;
2529
2530                 /* verify action_code is present */
2531                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2532                         break;
2533
2534                 switch (mgmt->u.action.u.addba_req.action_code) {
2535                 case WLAN_ACTION_ADDBA_REQ:
2536                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2537                                    sizeof(mgmt->u.action.u.addba_req)))
2538                                 goto invalid;
2539                         break;
2540                 case WLAN_ACTION_ADDBA_RESP:
2541                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2542                                    sizeof(mgmt->u.action.u.addba_resp)))
2543                                 goto invalid;
2544                         break;
2545                 case WLAN_ACTION_DELBA:
2546                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2547                                    sizeof(mgmt->u.action.u.delba)))
2548                                 goto invalid;
2549                         break;
2550                 default:
2551                         goto invalid;
2552                 }
2553
2554                 goto queue;
2555         case WLAN_CATEGORY_SPECTRUM_MGMT:
2556                 /* verify action_code is present */
2557                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2558                         break;
2559
2560                 switch (mgmt->u.action.u.measurement.action_code) {
2561                 case WLAN_ACTION_SPCT_MSR_REQ:
2562                         if (status->band != IEEE80211_BAND_5GHZ)
2563                                 break;
2564
2565                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2566                                    sizeof(mgmt->u.action.u.measurement)))
2567                                 break;
2568
2569                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2570                                 break;
2571
2572                         ieee80211_process_measurement_req(sdata, mgmt, len);
2573                         goto handled;
2574                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2575                         u8 *bssid;
2576                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2577                                    sizeof(mgmt->u.action.u.chan_switch)))
2578                                 break;
2579
2580                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2581                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2582                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2583                                 break;
2584
2585                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2586                                 bssid = sdata->u.mgd.bssid;
2587                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2588                                 bssid = sdata->u.ibss.bssid;
2589                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2590                                 bssid = mgmt->sa;
2591                         else
2592                                 break;
2593
2594                         if (!ether_addr_equal(mgmt->bssid, bssid))
2595                                 break;
2596
2597                         goto queue;
2598                         }
2599                 }
2600                 break;
2601         case WLAN_CATEGORY_SA_QUERY:
2602                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2603                            sizeof(mgmt->u.action.u.sa_query)))
2604                         break;
2605
2606                 switch (mgmt->u.action.u.sa_query.action) {
2607                 case WLAN_ACTION_SA_QUERY_REQUEST:
2608                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2609                                 break;
2610                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2611                         goto handled;
2612                 }
2613                 break;
2614         case WLAN_CATEGORY_SELF_PROTECTED:
2615                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2616                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2617                         break;
2618
2619                 switch (mgmt->u.action.u.self_prot.action_code) {
2620                 case WLAN_SP_MESH_PEERING_OPEN:
2621                 case WLAN_SP_MESH_PEERING_CLOSE:
2622                 case WLAN_SP_MESH_PEERING_CONFIRM:
2623                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2624                                 goto invalid;
2625                         if (sdata->u.mesh.user_mpm)
2626                                 /* userspace handles this frame */
2627                                 break;
2628                         goto queue;
2629                 case WLAN_SP_MGK_INFORM:
2630                 case WLAN_SP_MGK_ACK:
2631                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2632                                 goto invalid;
2633                         break;
2634                 }
2635                 break;
2636         case WLAN_CATEGORY_MESH_ACTION:
2637                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2638                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2639                         break;
2640
2641                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2642                         break;
2643                 if (mesh_action_is_path_sel(mgmt) &&
2644                     !mesh_path_sel_is_hwmp(sdata))
2645                         break;
2646                 goto queue;
2647         }
2648
2649         return RX_CONTINUE;
2650
2651  invalid:
2652         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2653         /* will return in the next handlers */
2654         return RX_CONTINUE;
2655
2656  handled:
2657         if (rx->sta)
2658                 rx->sta->rx_packets++;
2659         dev_kfree_skb(rx->skb);
2660         return RX_QUEUED;
2661
2662  queue:
2663         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2664         skb_queue_tail(&sdata->skb_queue, rx->skb);
2665         ieee80211_queue_work(&local->hw, &sdata->work);
2666         if (rx->sta)
2667                 rx->sta->rx_packets++;
2668         return RX_QUEUED;
2669 }
2670
2671 static ieee80211_rx_result debug_noinline
2672 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2673 {
2674         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2675         int sig = 0;
2676
2677         /* skip known-bad action frames and return them in the next handler */
2678         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2679                 return RX_CONTINUE;
2680
2681         /*
2682          * Getting here means the kernel doesn't know how to handle
2683          * it, but maybe userspace does ... include returned frames
2684          * so userspace can register for those to know whether ones
2685          * it transmitted were processed or returned.
2686          */
2687
2688         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2689                 sig = status->signal;
2690
2691         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2692                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2693                 if (rx->sta)
2694                         rx->sta->rx_packets++;
2695                 dev_kfree_skb(rx->skb);
2696                 return RX_QUEUED;
2697         }
2698
2699         return RX_CONTINUE;
2700 }
2701
2702 static ieee80211_rx_result debug_noinline
2703 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2704 {
2705         struct ieee80211_local *local = rx->local;
2706         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2707         struct sk_buff *nskb;
2708         struct ieee80211_sub_if_data *sdata = rx->sdata;
2709         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2710
2711         if (!ieee80211_is_action(mgmt->frame_control))
2712                 return RX_CONTINUE;
2713
2714         /*
2715          * For AP mode, hostapd is responsible for handling any action
2716          * frames that we didn't handle, including returning unknown
2717          * ones. For all other modes we will return them to the sender,
2718          * setting the 0x80 bit in the action category, as required by
2719          * 802.11-2012 9.24.4.
2720          * Newer versions of hostapd shall also use the management frame
2721          * registration mechanisms, but older ones still use cooked
2722          * monitor interfaces so push all frames there.
2723          */
2724         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2725             (sdata->vif.type == NL80211_IFTYPE_AP ||
2726              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2727                 return RX_DROP_MONITOR;
2728
2729         if (is_multicast_ether_addr(mgmt->da))
2730                 return RX_DROP_MONITOR;
2731
2732         /* do not return rejected action frames */
2733         if (mgmt->u.action.category & 0x80)
2734                 return RX_DROP_UNUSABLE;
2735
2736         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2737                                GFP_ATOMIC);
2738         if (nskb) {
2739                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2740
2741                 nmgmt->u.action.category |= 0x80;
2742                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2743                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2744
2745                 memset(nskb->cb, 0, sizeof(nskb->cb));
2746
2747                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2748                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2749
2750                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2751                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2752                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2753                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2754                                 info->hw_queue =
2755                                         local->hw.offchannel_tx_hw_queue;
2756                 }
2757
2758                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2759                                             status->band);
2760         }
2761         dev_kfree_skb(rx->skb);
2762         return RX_QUEUED;
2763 }
2764
2765 static ieee80211_rx_result debug_noinline
2766 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2767 {
2768         struct ieee80211_sub_if_data *sdata = rx->sdata;
2769         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2770         __le16 stype;
2771
2772         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2773
2774         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2775             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2776             sdata->vif.type != NL80211_IFTYPE_STATION)
2777                 return RX_DROP_MONITOR;
2778
2779         switch (stype) {
2780         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2781         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2782         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2783                 /* process for all: mesh, mlme, ibss */
2784                 break;
2785         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2786         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2787         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2788         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2789                 if (is_multicast_ether_addr(mgmt->da) &&
2790                     !is_broadcast_ether_addr(mgmt->da))
2791                         return RX_DROP_MONITOR;
2792
2793                 /* process only for station */
2794                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2795                         return RX_DROP_MONITOR;
2796                 break;
2797         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2798                 /* process only for ibss and mesh */
2799                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2800                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2801                         return RX_DROP_MONITOR;
2802                 break;
2803         default:
2804                 return RX_DROP_MONITOR;
2805         }
2806
2807         /* queue up frame and kick off work to process it */
2808         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2809         skb_queue_tail(&sdata->skb_queue, rx->skb);
2810         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2811         if (rx->sta)
2812                 rx->sta->rx_packets++;
2813
2814         return RX_QUEUED;
2815 }
2816
2817 /* TODO: use IEEE80211_RX_FRAGMENTED */
2818 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2819                                         struct ieee80211_rate *rate)
2820 {
2821         struct ieee80211_sub_if_data *sdata;
2822         struct ieee80211_local *local = rx->local;
2823         struct sk_buff *skb = rx->skb, *skb2;
2824         struct net_device *prev_dev = NULL;
2825         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2826         int needed_headroom;
2827
2828         /*
2829          * If cooked monitor has been processed already, then
2830          * don't do it again. If not, set the flag.
2831          */
2832         if (rx->flags & IEEE80211_RX_CMNTR)
2833                 goto out_free_skb;
2834         rx->flags |= IEEE80211_RX_CMNTR;
2835
2836         /* If there are no cooked monitor interfaces, just free the SKB */
2837         if (!local->cooked_mntrs)
2838                 goto out_free_skb;
2839
2840         /* room for the radiotap header based on driver features */
2841         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2842
2843         if (skb_headroom(skb) < needed_headroom &&
2844             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2845                 goto out_free_skb;
2846
2847         /* prepend radiotap information */
2848         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2849                                          false);
2850
2851         skb_set_mac_header(skb, 0);
2852         skb->ip_summed = CHECKSUM_UNNECESSARY;
2853         skb->pkt_type = PACKET_OTHERHOST;
2854         skb->protocol = htons(ETH_P_802_2);
2855
2856         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2857                 if (!ieee80211_sdata_running(sdata))
2858                         continue;
2859
2860                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2861                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2862                         continue;
2863
2864                 if (prev_dev) {
2865                         skb2 = skb_clone(skb, GFP_ATOMIC);
2866                         if (skb2) {
2867                                 skb2->dev = prev_dev;
2868                                 netif_receive_skb(skb2);
2869                         }
2870                 }
2871
2872                 prev_dev = sdata->dev;
2873                 sdata->dev->stats.rx_packets++;
2874                 sdata->dev->stats.rx_bytes += skb->len;
2875         }
2876
2877         if (prev_dev) {
2878                 skb->dev = prev_dev;
2879                 netif_receive_skb(skb);
2880                 return;
2881         }
2882
2883  out_free_skb:
2884         dev_kfree_skb(skb);
2885 }
2886
2887 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2888                                          ieee80211_rx_result res)
2889 {
2890         switch (res) {
2891         case RX_DROP_MONITOR:
2892                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2893                 if (rx->sta)
2894                         rx->sta->rx_dropped++;
2895                 /* fall through */
2896         case RX_CONTINUE: {
2897                 struct ieee80211_rate *rate = NULL;
2898                 struct ieee80211_supported_band *sband;
2899                 struct ieee80211_rx_status *status;
2900
2901                 status = IEEE80211_SKB_RXCB((rx->skb));
2902
2903                 sband = rx->local->hw.wiphy->bands[status->band];
2904                 if (!(status->flag & RX_FLAG_HT) &&
2905                     !(status->flag & RX_FLAG_VHT))
2906                         rate = &sband->bitrates[status->rate_idx];
2907
2908                 ieee80211_rx_cooked_monitor(rx, rate);
2909                 break;
2910                 }
2911         case RX_DROP_UNUSABLE:
2912                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2913                 if (rx->sta)
2914                         rx->sta->rx_dropped++;
2915                 dev_kfree_skb(rx->skb);
2916                 break;
2917         case RX_QUEUED:
2918                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2919                 break;
2920         }
2921 }
2922
2923 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2924                                   struct sk_buff_head *frames)
2925 {
2926         ieee80211_rx_result res = RX_DROP_MONITOR;
2927         struct sk_buff *skb;
2928
2929 #define CALL_RXH(rxh)                   \
2930         do {                            \
2931                 res = rxh(rx);          \
2932                 if (res != RX_CONTINUE) \
2933                         goto rxh_next;  \
2934         } while (0);
2935
2936         spin_lock_bh(&rx->local->rx_path_lock);
2937
2938         while ((skb = __skb_dequeue(frames))) {
2939                 /*
2940                  * all the other fields are valid across frames
2941                  * that belong to an aMPDU since they are on the
2942                  * same TID from the same station
2943                  */
2944                 rx->skb = skb;
2945
2946                 CALL_RXH(ieee80211_rx_h_check_more_data)
2947                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2948                 CALL_RXH(ieee80211_rx_h_sta_process)
2949                 CALL_RXH(ieee80211_rx_h_decrypt)
2950                 CALL_RXH(ieee80211_rx_h_defragment)
2951                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2952                 /* must be after MMIC verify so header is counted in MPDU mic */
2953 #ifdef CONFIG_MAC80211_MESH
2954                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2955                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2956 #endif
2957                 CALL_RXH(ieee80211_rx_h_amsdu)
2958                 CALL_RXH(ieee80211_rx_h_data)
2959
2960                 /* special treatment -- needs the queue */
2961                 res = ieee80211_rx_h_ctrl(rx, frames);
2962                 if (res != RX_CONTINUE)
2963                         goto rxh_next;
2964
2965                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2966                 CALL_RXH(ieee80211_rx_h_action)
2967                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2968                 CALL_RXH(ieee80211_rx_h_action_return)
2969                 CALL_RXH(ieee80211_rx_h_mgmt)
2970
2971  rxh_next:
2972                 ieee80211_rx_handlers_result(rx, res);
2973
2974 #undef CALL_RXH
2975         }
2976
2977         spin_unlock_bh(&rx->local->rx_path_lock);
2978 }
2979
2980 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2981 {
2982         struct sk_buff_head reorder_release;
2983         ieee80211_rx_result res = RX_DROP_MONITOR;
2984
2985         __skb_queue_head_init(&reorder_release);
2986
2987 #define CALL_RXH(rxh)                   \
2988         do {                            \
2989                 res = rxh(rx);          \
2990                 if (res != RX_CONTINUE) \
2991                         goto rxh_next;  \
2992         } while (0);
2993
2994         CALL_RXH(ieee80211_rx_h_check)
2995
2996         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2997
2998         ieee80211_rx_handlers(rx, &reorder_release);
2999         return;
3000
3001  rxh_next:
3002         ieee80211_rx_handlers_result(rx, res);
3003
3004 #undef CALL_RXH
3005 }
3006
3007 /*
3008  * This function makes calls into the RX path, therefore
3009  * it has to be invoked under RCU read lock.
3010  */
3011 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3012 {
3013         struct sk_buff_head frames;
3014         struct ieee80211_rx_data rx = {
3015                 .sta = sta,
3016                 .sdata = sta->sdata,
3017                 .local = sta->local,
3018                 /* This is OK -- must be QoS data frame */
3019                 .security_idx = tid,
3020                 .seqno_idx = tid,
3021                 .flags = 0,
3022         };
3023         struct tid_ampdu_rx *tid_agg_rx;
3024
3025         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3026         if (!tid_agg_rx)
3027                 return;
3028
3029         __skb_queue_head_init(&frames);
3030
3031         spin_lock(&tid_agg_rx->reorder_lock);
3032         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3033         spin_unlock(&tid_agg_rx->reorder_lock);
3034
3035         ieee80211_rx_handlers(&rx, &frames);
3036 }
3037
3038 /* main receive path */
3039
3040 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3041                                  struct ieee80211_hdr *hdr)
3042 {
3043         struct ieee80211_sub_if_data *sdata = rx->sdata;
3044         struct sk_buff *skb = rx->skb;
3045         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3046         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3047         int multicast = is_multicast_ether_addr(hdr->addr1);
3048
3049         switch (sdata->vif.type) {
3050         case NL80211_IFTYPE_STATION:
3051                 if (!bssid && !sdata->u.mgd.use_4addr)
3052                         return false;
3053                 if (!multicast &&
3054                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3055                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3056                             sdata->u.mgd.use_4addr)
3057                                 return false;
3058                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3059                 }
3060                 break;
3061         case NL80211_IFTYPE_ADHOC:
3062                 if (!bssid)
3063                         return false;
3064                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3065                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3066                         return false;
3067                 if (ieee80211_is_beacon(hdr->frame_control)) {
3068                         return true;
3069                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3070                         return false;
3071                 } else if (!multicast &&
3072                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3073                         if (!(sdata->dev->flags & IFF_PROMISC))
3074                                 return false;
3075                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3076                 } else if (!rx->sta) {
3077                         int rate_idx;
3078                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3079                                 rate_idx = 0; /* TODO: HT/VHT rates */
3080                         else
3081                                 rate_idx = status->rate_idx;
3082                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3083                                                  BIT(rate_idx));
3084                 }
3085                 break;
3086         case NL80211_IFTYPE_MESH_POINT:
3087                 if (!multicast &&
3088                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3089                         if (!(sdata->dev->flags & IFF_PROMISC))
3090                                 return false;
3091
3092                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3093                 }
3094                 break;
3095         case NL80211_IFTYPE_AP_VLAN:
3096         case NL80211_IFTYPE_AP:
3097                 if (!bssid) {
3098                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3099                                 return false;
3100                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3101                         /*
3102                          * Accept public action frames even when the
3103                          * BSSID doesn't match, this is used for P2P
3104                          * and location updates. Note that mac80211
3105                          * itself never looks at these frames.
3106                          */
3107                         if (!multicast &&
3108                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3109                                 return false;
3110                         if (ieee80211_is_public_action(hdr, skb->len))
3111                                 return true;
3112                         if (!ieee80211_is_beacon(hdr->frame_control))
3113                                 return false;
3114                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3115                 }
3116                 break;
3117         case NL80211_IFTYPE_WDS:
3118                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3119                         return false;
3120                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3121                         return false;
3122                 break;
3123         case NL80211_IFTYPE_P2P_DEVICE:
3124                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3125                     !ieee80211_is_probe_req(hdr->frame_control) &&
3126                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3127                     !ieee80211_is_beacon(hdr->frame_control))
3128                         return false;
3129                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3130                     !multicast)
3131                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3132                 break;
3133         default:
3134                 /* should never get here */
3135                 WARN_ON_ONCE(1);
3136                 break;
3137         }
3138
3139         return true;
3140 }
3141
3142 /*
3143  * This function returns whether or not the SKB
3144  * was destined for RX processing or not, which,
3145  * if consume is true, is equivalent to whether
3146  * or not the skb was consumed.
3147  */
3148 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3149                                             struct sk_buff *skb, bool consume)
3150 {
3151         struct ieee80211_local *local = rx->local;
3152         struct ieee80211_sub_if_data *sdata = rx->sdata;
3153         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3154         struct ieee80211_hdr *hdr = (void *)skb->data;
3155
3156         rx->skb = skb;
3157         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3158
3159         if (!prepare_for_handlers(rx, hdr))
3160                 return false;
3161
3162         if (!consume) {
3163                 skb = skb_copy(skb, GFP_ATOMIC);
3164                 if (!skb) {
3165                         if (net_ratelimit())
3166                                 wiphy_debug(local->hw.wiphy,
3167                                         "failed to copy skb for %s\n",
3168                                         sdata->name);
3169                         return true;
3170                 }
3171
3172                 rx->skb = skb;
3173         }
3174
3175         ieee80211_invoke_rx_handlers(rx);
3176         return true;
3177 }
3178
3179 /*
3180  * This is the actual Rx frames handler. as it blongs to Rx path it must
3181  * be called with rcu_read_lock protection.
3182  */
3183 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3184                                          struct sk_buff *skb)
3185 {
3186         struct ieee80211_local *local = hw_to_local(hw);
3187         struct ieee80211_sub_if_data *sdata;
3188         struct ieee80211_hdr *hdr;
3189         __le16 fc;
3190         struct ieee80211_rx_data rx;
3191         struct ieee80211_sub_if_data *prev;
3192         struct sta_info *sta, *tmp, *prev_sta;
3193         int err = 0;
3194
3195         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3196         memset(&rx, 0, sizeof(rx));
3197         rx.skb = skb;
3198         rx.local = local;
3199
3200         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3201                 local->dot11ReceivedFragmentCount++;
3202
3203         if (ieee80211_is_mgmt(fc)) {
3204                 /* drop frame if too short for header */
3205                 if (skb->len < ieee80211_hdrlen(fc))
3206                         err = -ENOBUFS;
3207                 else
3208                         err = skb_linearize(skb);
3209         } else {
3210                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3211         }
3212
3213         if (err) {
3214                 dev_kfree_skb(skb);
3215                 return;
3216         }
3217
3218         hdr = (struct ieee80211_hdr *)skb->data;
3219         ieee80211_parse_qos(&rx);
3220         ieee80211_verify_alignment(&rx);
3221
3222         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3223                      ieee80211_is_beacon(hdr->frame_control)))
3224                 ieee80211_scan_rx(local, skb);
3225
3226         if (ieee80211_is_data(fc)) {
3227                 prev_sta = NULL;
3228
3229                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3230                         if (!prev_sta) {
3231                                 prev_sta = sta;
3232                                 continue;
3233                         }
3234
3235                         rx.sta = prev_sta;
3236                         rx.sdata = prev_sta->sdata;
3237                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3238
3239                         prev_sta = sta;
3240                 }
3241
3242                 if (prev_sta) {
3243                         rx.sta = prev_sta;
3244                         rx.sdata = prev_sta->sdata;
3245
3246                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3247                                 return;
3248                         goto out;
3249                 }
3250         }
3251
3252         prev = NULL;
3253
3254         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3255                 if (!ieee80211_sdata_running(sdata))
3256                         continue;
3257
3258                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3259                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3260                         continue;
3261
3262                 /*
3263                  * frame is destined for this interface, but if it's
3264                  * not also for the previous one we handle that after
3265                  * the loop to avoid copying the SKB once too much
3266                  */
3267
3268                 if (!prev) {
3269                         prev = sdata;
3270                         continue;
3271                 }
3272
3273                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3274                 rx.sdata = prev;
3275                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3276
3277                 prev = sdata;
3278         }
3279
3280         if (prev) {
3281                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3282                 rx.sdata = prev;
3283
3284                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3285                         return;
3286         }
3287
3288  out:
3289         dev_kfree_skb(skb);
3290 }
3291
3292 /*
3293  * This is the receive path handler. It is called by a low level driver when an
3294  * 802.11 MPDU is received from the hardware.
3295  */
3296 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3297 {
3298         struct ieee80211_local *local = hw_to_local(hw);
3299         struct ieee80211_rate *rate = NULL;
3300         struct ieee80211_supported_band *sband;
3301         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3302
3303         WARN_ON_ONCE(softirq_count() == 0);
3304
3305         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3306                 goto drop;
3307
3308         sband = local->hw.wiphy->bands[status->band];
3309         if (WARN_ON(!sband))
3310                 goto drop;
3311
3312         /*
3313          * If we're suspending, it is possible although not too likely
3314          * that we'd be receiving frames after having already partially
3315          * quiesced the stack. We can't process such frames then since
3316          * that might, for example, cause stations to be added or other
3317          * driver callbacks be invoked.
3318          */
3319         if (unlikely(local->quiescing || local->suspended))
3320                 goto drop;
3321
3322         /* We might be during a HW reconfig, prevent Rx for the same reason */
3323         if (unlikely(local->in_reconfig))
3324                 goto drop;
3325
3326         /*
3327          * The same happens when we're not even started,
3328          * but that's worth a warning.
3329          */
3330         if (WARN_ON(!local->started))
3331                 goto drop;
3332
3333         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3334                 /*
3335                  * Validate the rate, unless a PLCP error means that
3336                  * we probably can't have a valid rate here anyway.
3337                  */
3338
3339                 if (status->flag & RX_FLAG_HT) {
3340                         /*
3341                          * rate_idx is MCS index, which can be [0-76]
3342                          * as documented on:
3343                          *
3344                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3345                          *
3346                          * Anything else would be some sort of driver or
3347                          * hardware error. The driver should catch hardware
3348                          * errors.
3349                          */
3350                         if (WARN(status->rate_idx > 76,
3351                                  "Rate marked as an HT rate but passed "
3352                                  "status->rate_idx is not "
3353                                  "an MCS index [0-76]: %d (0x%02x)\n",
3354                                  status->rate_idx,
3355                                  status->rate_idx))
3356                                 goto drop;
3357                 } else if (status->flag & RX_FLAG_VHT) {
3358                         if (WARN_ONCE(status->rate_idx > 9 ||
3359                                       !status->vht_nss ||
3360                                       status->vht_nss > 8,
3361                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3362                                       status->rate_idx, status->vht_nss))
3363                                 goto drop;
3364                 } else {
3365                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3366                                 goto drop;
3367                         rate = &sband->bitrates[status->rate_idx];
3368                 }
3369         }
3370
3371         status->rx_flags = 0;
3372
3373         /*
3374          * key references and virtual interfaces are protected using RCU
3375          * and this requires that we are in a read-side RCU section during
3376          * receive processing
3377          */
3378         rcu_read_lock();
3379
3380         /*
3381          * Frames with failed FCS/PLCP checksum are not returned,
3382          * all other frames are returned without radiotap header
3383          * if it was previously present.
3384          * Also, frames with less than 16 bytes are dropped.
3385          */
3386         skb = ieee80211_rx_monitor(local, skb, rate);
3387         if (!skb) {
3388                 rcu_read_unlock();
3389                 return;
3390         }
3391
3392         ieee80211_tpt_led_trig_rx(local,
3393                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3394                         skb->len);
3395         __ieee80211_rx_handle_packet(hw, skb);
3396
3397         rcu_read_unlock();
3398
3399         return;
3400  drop:
3401         kfree_skb(skb);
3402 }
3403 EXPORT_SYMBOL(ieee80211_rx);
3404
3405 /* This is a version of the rx handler that can be called from hard irq
3406  * context. Post the skb on the queue and schedule the tasklet */
3407 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3408 {
3409         struct ieee80211_local *local = hw_to_local(hw);
3410
3411         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3412
3413         skb->pkt_type = IEEE80211_RX_MSG;
3414         skb_queue_tail(&local->skb_queue, skb);
3415         tasklet_schedule(&local->tasklet);
3416 }
3417 EXPORT_SYMBOL(ieee80211_rx_irqsafe);