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                 /*
1096                  * Clear the flag only if the other one is still set
1097                  * so that the TX path won't start TX'ing new frames
1098                  * directly ... In the case that the driver flag isn't
1099                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1100                  */
1101                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1102                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1103                        sta->sta.addr, sta->sta.aid);
1104                 return;
1105         }
1106
1107         ieee80211_sta_ps_deliver_wakeup(sta);
1108 }
1109
1110 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1111 {
1112         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1113         bool in_ps;
1114
1115         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1116
1117         /* Don't let the same PS state be set twice */
1118         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1119         if ((start && in_ps) || (!start && !in_ps))
1120                 return -EINVAL;
1121
1122         if (start)
1123                 sta_ps_start(sta_inf);
1124         else
1125                 sta_ps_end(sta_inf);
1126
1127         return 0;
1128 }
1129 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1130
1131 static ieee80211_rx_result debug_noinline
1132 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1133 {
1134         struct ieee80211_sub_if_data *sdata = rx->sdata;
1135         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1136         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1137         int tid, ac;
1138
1139         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1140                 return RX_CONTINUE;
1141
1142         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1143             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1144                 return RX_CONTINUE;
1145
1146         /*
1147          * The device handles station powersave, so don't do anything about
1148          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1149          * it to mac80211 since they're handled.)
1150          */
1151         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1152                 return RX_CONTINUE;
1153
1154         /*
1155          * Don't do anything if the station isn't already asleep. In
1156          * the uAPSD case, the station will probably be marked asleep,
1157          * in the PS-Poll case the station must be confused ...
1158          */
1159         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1160                 return RX_CONTINUE;
1161
1162         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1163                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1164                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1165                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1166                         else
1167                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1168                 }
1169
1170                 /* Free PS Poll skb here instead of returning RX_DROP that would
1171                  * count as an dropped frame. */
1172                 dev_kfree_skb(rx->skb);
1173
1174                 return RX_QUEUED;
1175         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1176                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1177                    ieee80211_has_pm(hdr->frame_control) &&
1178                    (ieee80211_is_data_qos(hdr->frame_control) ||
1179                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1180                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1181                 ac = ieee802_1d_to_ac[tid & 7];
1182
1183                 /*
1184                  * If this AC is not trigger-enabled do nothing.
1185                  *
1186                  * NB: This could/should check a separate bitmap of trigger-
1187                  * enabled queues, but for now we only implement uAPSD w/o
1188                  * TSPEC changes to the ACs, so they're always the same.
1189                  */
1190                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1191                         return RX_CONTINUE;
1192
1193                 /* if we are in a service period, do nothing */
1194                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1195                         return RX_CONTINUE;
1196
1197                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1198                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1199                 else
1200                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1201         }
1202
1203         return RX_CONTINUE;
1204 }
1205
1206 static ieee80211_rx_result debug_noinline
1207 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1208 {
1209         struct sta_info *sta = rx->sta;
1210         struct sk_buff *skb = rx->skb;
1211         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1212         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1213         int i;
1214
1215         if (!sta)
1216                 return RX_CONTINUE;
1217
1218         /*
1219          * Update last_rx only for IBSS packets which are for the current
1220          * BSSID and for station already AUTHORIZED to avoid keeping the
1221          * current IBSS network alive in cases where other STAs start
1222          * using different BSSID. This will also give the station another
1223          * chance to restart the authentication/authorization in case
1224          * something went wrong the first time.
1225          */
1226         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1227                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1228                                                 NL80211_IFTYPE_ADHOC);
1229                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1230                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1231                         sta->last_rx = jiffies;
1232                         if (ieee80211_is_data(hdr->frame_control)) {
1233                                 sta->last_rx_rate_idx = status->rate_idx;
1234                                 sta->last_rx_rate_flag = status->flag;
1235                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1236                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1237                         }
1238                 }
1239         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1240                 /*
1241                  * Mesh beacons will update last_rx when if they are found to
1242                  * match the current local configuration when processed.
1243                  */
1244                 sta->last_rx = jiffies;
1245                 if (ieee80211_is_data(hdr->frame_control)) {
1246                         sta->last_rx_rate_idx = status->rate_idx;
1247                         sta->last_rx_rate_flag = status->flag;
1248                         sta->last_rx_rate_vht_nss = status->vht_nss;
1249                 }
1250         }
1251
1252         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1253                 return RX_CONTINUE;
1254
1255         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1256                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1257
1258         sta->rx_fragments++;
1259         sta->rx_bytes += rx->skb->len;
1260         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1261                 sta->last_signal = status->signal;
1262                 ewma_add(&sta->avg_signal, -status->signal);
1263         }
1264
1265         if (status->chains) {
1266                 sta->chains = status->chains;
1267                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1268                         int signal = status->chain_signal[i];
1269
1270                         if (!(status->chains & BIT(i)))
1271                                 continue;
1272
1273                         sta->chain_signal_last[i] = signal;
1274                         ewma_add(&sta->chain_signal_avg[i], -signal);
1275                 }
1276         }
1277
1278         /*
1279          * Change STA power saving mode only at the end of a frame
1280          * exchange sequence.
1281          */
1282         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1283             !ieee80211_has_morefrags(hdr->frame_control) &&
1284             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1285             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1286              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1287             /* PM bit is only checked in frames where it isn't reserved,
1288              * in AP mode it's reserved in non-bufferable management frames
1289              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1290              */
1291             (!ieee80211_is_mgmt(hdr->frame_control) ||
1292              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1293                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1294                         if (!ieee80211_has_pm(hdr->frame_control))
1295                                 sta_ps_end(sta);
1296                 } else {
1297                         if (ieee80211_has_pm(hdr->frame_control))
1298                                 sta_ps_start(sta);
1299                 }
1300         }
1301
1302         /* mesh power save support */
1303         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1304                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1305
1306         /*
1307          * Drop (qos-)data::nullfunc frames silently, since they
1308          * are used only to control station power saving mode.
1309          */
1310         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1311             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1312                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1313
1314                 /*
1315                  * If we receive a 4-addr nullfunc frame from a STA
1316                  * that was not moved to a 4-addr STA vlan yet send
1317                  * the event to userspace and for older hostapd drop
1318                  * the frame to the monitor interface.
1319                  */
1320                 if (ieee80211_has_a4(hdr->frame_control) &&
1321                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1322                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1323                       !rx->sdata->u.vlan.sta))) {
1324                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1325                                 cfg80211_rx_unexpected_4addr_frame(
1326                                         rx->sdata->dev, sta->sta.addr,
1327                                         GFP_ATOMIC);
1328                         return RX_DROP_MONITOR;
1329                 }
1330                 /*
1331                  * Update counter and free packet here to avoid
1332                  * counting this as a dropped packed.
1333                  */
1334                 sta->rx_packets++;
1335                 dev_kfree_skb(rx->skb);
1336                 return RX_QUEUED;
1337         }
1338
1339         return RX_CONTINUE;
1340 } /* ieee80211_rx_h_sta_process */
1341
1342 static ieee80211_rx_result debug_noinline
1343 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1344 {
1345         struct sk_buff *skb = rx->skb;
1346         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1347         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1348         int keyidx;
1349         int hdrlen;
1350         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1351         struct ieee80211_key *sta_ptk = NULL;
1352         int mmie_keyidx = -1;
1353         __le16 fc;
1354         const struct ieee80211_cipher_scheme *cs = NULL;
1355
1356         /*
1357          * Key selection 101
1358          *
1359          * There are four types of keys:
1360          *  - GTK (group keys)
1361          *  - IGTK (group keys for management frames)
1362          *  - PTK (pairwise keys)
1363          *  - STK (station-to-station pairwise keys)
1364          *
1365          * When selecting a key, we have to distinguish between multicast
1366          * (including broadcast) and unicast frames, the latter can only
1367          * use PTKs and STKs while the former always use GTKs and IGTKs.
1368          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1369          * unicast frames can also use key indices like GTKs. Hence, if we
1370          * don't have a PTK/STK we check the key index for a WEP key.
1371          *
1372          * Note that in a regular BSS, multicast frames are sent by the
1373          * AP only, associated stations unicast the frame to the AP first
1374          * which then multicasts it on their behalf.
1375          *
1376          * There is also a slight problem in IBSS mode: GTKs are negotiated
1377          * with each station, that is something we don't currently handle.
1378          * The spec seems to expect that one negotiates the same key with
1379          * every station but there's no such requirement; VLANs could be
1380          * possible.
1381          */
1382
1383         /*
1384          * No point in finding a key and decrypting if the frame is neither
1385          * addressed to us nor a multicast frame.
1386          */
1387         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1388                 return RX_CONTINUE;
1389
1390         /* start without a key */
1391         rx->key = NULL;
1392         fc = hdr->frame_control;
1393
1394         if (rx->sta) {
1395                 int keyid = rx->sta->ptk_idx;
1396
1397                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1398                         cs = rx->sta->cipher_scheme;
1399                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1400                         if (unlikely(keyid < 0))
1401                                 return RX_DROP_UNUSABLE;
1402                 }
1403                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1404         }
1405
1406         if (!ieee80211_has_protected(fc))
1407                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1408
1409         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1410                 rx->key = sta_ptk;
1411                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1412                     (status->flag & RX_FLAG_IV_STRIPPED))
1413                         return RX_CONTINUE;
1414                 /* Skip decryption if the frame is not protected. */
1415                 if (!ieee80211_has_protected(fc))
1416                         return RX_CONTINUE;
1417         } else if (mmie_keyidx >= 0) {
1418                 /* Broadcast/multicast robust management frame / BIP */
1419                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1420                     (status->flag & RX_FLAG_IV_STRIPPED))
1421                         return RX_CONTINUE;
1422
1423                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1424                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1425                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1426                 if (rx->sta)
1427                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1428                 if (!rx->key)
1429                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1430         } else if (!ieee80211_has_protected(fc)) {
1431                 /*
1432                  * The frame was not protected, so skip decryption. However, we
1433                  * need to set rx->key if there is a key that could have been
1434                  * used so that the frame may be dropped if encryption would
1435                  * have been expected.
1436                  */
1437                 struct ieee80211_key *key = NULL;
1438                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1439                 int i;
1440
1441                 if (ieee80211_is_mgmt(fc) &&
1442                     is_multicast_ether_addr(hdr->addr1) &&
1443                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1444                         rx->key = key;
1445                 else {
1446                         if (rx->sta) {
1447                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1448                                         key = rcu_dereference(rx->sta->gtk[i]);
1449                                         if (key)
1450                                                 break;
1451                                 }
1452                         }
1453                         if (!key) {
1454                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1455                                         key = rcu_dereference(sdata->keys[i]);
1456                                         if (key)
1457                                                 break;
1458                                 }
1459                         }
1460                         if (key)
1461                                 rx->key = key;
1462                 }
1463                 return RX_CONTINUE;
1464         } else {
1465                 u8 keyid;
1466
1467                 /*
1468                  * The device doesn't give us the IV so we won't be
1469                  * able to look up the key. That's ok though, we
1470                  * don't need to decrypt the frame, we just won't
1471                  * be able to keep statistics accurate.
1472                  * Except for key threshold notifications, should
1473                  * we somehow allow the driver to tell us which key
1474                  * the hardware used if this flag is set?
1475                  */
1476                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1477                     (status->flag & RX_FLAG_IV_STRIPPED))
1478                         return RX_CONTINUE;
1479
1480                 hdrlen = ieee80211_hdrlen(fc);
1481
1482                 if (cs) {
1483                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1484
1485                         if (unlikely(keyidx < 0))
1486                                 return RX_DROP_UNUSABLE;
1487                 } else {
1488                         if (rx->skb->len < 8 + hdrlen)
1489                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1490                         /*
1491                          * no need to call ieee80211_wep_get_keyidx,
1492                          * it verifies a bunch of things we've done already
1493                          */
1494                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1495                         keyidx = keyid >> 6;
1496                 }
1497
1498                 /* check per-station GTK first, if multicast packet */
1499                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1500                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1501
1502                 /* if not found, try default key */
1503                 if (!rx->key) {
1504                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1505
1506                         /*
1507                          * RSNA-protected unicast frames should always be
1508                          * sent with pairwise or station-to-station keys,
1509                          * but for WEP we allow using a key index as well.
1510                          */
1511                         if (rx->key &&
1512                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1513                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1514                             !is_multicast_ether_addr(hdr->addr1))
1515                                 rx->key = NULL;
1516                 }
1517         }
1518
1519         if (rx->key) {
1520                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1521                         return RX_DROP_MONITOR;
1522
1523                 rx->key->tx_rx_count++;
1524                 /* TODO: add threshold stuff again */
1525         } else {
1526                 return RX_DROP_MONITOR;
1527         }
1528
1529         switch (rx->key->conf.cipher) {
1530         case WLAN_CIPHER_SUITE_WEP40:
1531         case WLAN_CIPHER_SUITE_WEP104:
1532                 result = ieee80211_crypto_wep_decrypt(rx);
1533                 break;
1534         case WLAN_CIPHER_SUITE_TKIP:
1535                 result = ieee80211_crypto_tkip_decrypt(rx);
1536                 break;
1537         case WLAN_CIPHER_SUITE_CCMP:
1538                 result = ieee80211_crypto_ccmp_decrypt(rx);
1539                 break;
1540         case WLAN_CIPHER_SUITE_AES_CMAC:
1541                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1542                 break;
1543         default:
1544                 result = ieee80211_crypto_hw_decrypt(rx);
1545         }
1546
1547         /* the hdr variable is invalid after the decrypt handlers */
1548
1549         /* either the frame has been decrypted or will be dropped */
1550         status->flag |= RX_FLAG_DECRYPTED;
1551
1552         return result;
1553 }
1554
1555 static inline struct ieee80211_fragment_entry *
1556 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1557                          unsigned int frag, unsigned int seq, int rx_queue,
1558                          struct sk_buff **skb)
1559 {
1560         struct ieee80211_fragment_entry *entry;
1561
1562         entry = &sdata->fragments[sdata->fragment_next++];
1563         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1564                 sdata->fragment_next = 0;
1565
1566         if (!skb_queue_empty(&entry->skb_list))
1567                 __skb_queue_purge(&entry->skb_list);
1568
1569         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1570         *skb = NULL;
1571         entry->first_frag_time = jiffies;
1572         entry->seq = seq;
1573         entry->rx_queue = rx_queue;
1574         entry->last_frag = frag;
1575         entry->ccmp = 0;
1576         entry->extra_len = 0;
1577
1578         return entry;
1579 }
1580
1581 static inline struct ieee80211_fragment_entry *
1582 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1583                           unsigned int frag, unsigned int seq,
1584                           int rx_queue, struct ieee80211_hdr *hdr)
1585 {
1586         struct ieee80211_fragment_entry *entry;
1587         int i, idx;
1588
1589         idx = sdata->fragment_next;
1590         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1591                 struct ieee80211_hdr *f_hdr;
1592
1593                 idx--;
1594                 if (idx < 0)
1595                         idx = IEEE80211_FRAGMENT_MAX - 1;
1596
1597                 entry = &sdata->fragments[idx];
1598                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1599                     entry->rx_queue != rx_queue ||
1600                     entry->last_frag + 1 != frag)
1601                         continue;
1602
1603                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1604
1605                 /*
1606                  * Check ftype and addresses are equal, else check next fragment
1607                  */
1608                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1609                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1610                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1611                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1612                         continue;
1613
1614                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1615                         __skb_queue_purge(&entry->skb_list);
1616                         continue;
1617                 }
1618                 return entry;
1619         }
1620
1621         return NULL;
1622 }
1623
1624 static ieee80211_rx_result debug_noinline
1625 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1626 {
1627         struct ieee80211_hdr *hdr;
1628         u16 sc;
1629         __le16 fc;
1630         unsigned int frag, seq;
1631         struct ieee80211_fragment_entry *entry;
1632         struct sk_buff *skb;
1633         struct ieee80211_rx_status *status;
1634
1635         hdr = (struct ieee80211_hdr *)rx->skb->data;
1636         fc = hdr->frame_control;
1637
1638         if (ieee80211_is_ctl(fc))
1639                 return RX_CONTINUE;
1640
1641         sc = le16_to_cpu(hdr->seq_ctrl);
1642         frag = sc & IEEE80211_SCTL_FRAG;
1643
1644         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1645                    is_multicast_ether_addr(hdr->addr1))) {
1646                 /* not fragmented */
1647                 goto out;
1648         }
1649         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1650
1651         if (skb_linearize(rx->skb))
1652                 return RX_DROP_UNUSABLE;
1653
1654         /*
1655          *  skb_linearize() might change the skb->data and
1656          *  previously cached variables (in this case, hdr) need to
1657          *  be refreshed with the new data.
1658          */
1659         hdr = (struct ieee80211_hdr *)rx->skb->data;
1660         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1661
1662         if (frag == 0) {
1663                 /* This is the first fragment of a new frame. */
1664                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1665                                                  rx->seqno_idx, &(rx->skb));
1666                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1667                     ieee80211_has_protected(fc)) {
1668                         int queue = rx->security_idx;
1669                         /* Store CCMP PN so that we can verify that the next
1670                          * fragment has a sequential PN value. */
1671                         entry->ccmp = 1;
1672                         memcpy(entry->last_pn,
1673                                rx->key->u.ccmp.rx_pn[queue],
1674                                IEEE80211_CCMP_PN_LEN);
1675                 }
1676                 return RX_QUEUED;
1677         }
1678
1679         /* This is a fragment for a frame that should already be pending in
1680          * fragment cache. Add this fragment to the end of the pending entry.
1681          */
1682         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1683                                           rx->seqno_idx, hdr);
1684         if (!entry) {
1685                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1686                 return RX_DROP_MONITOR;
1687         }
1688
1689         /* Verify that MPDUs within one MSDU have sequential PN values.
1690          * (IEEE 802.11i, 8.3.3.4.5) */
1691         if (entry->ccmp) {
1692                 int i;
1693                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1694                 int queue;
1695                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1696                         return RX_DROP_UNUSABLE;
1697                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1698                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1699                         pn[i]++;
1700                         if (pn[i])
1701                                 break;
1702                 }
1703                 queue = rx->security_idx;
1704                 rpn = rx->key->u.ccmp.rx_pn[queue];
1705                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1706                         return RX_DROP_UNUSABLE;
1707                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1708         }
1709
1710         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1711         __skb_queue_tail(&entry->skb_list, rx->skb);
1712         entry->last_frag = frag;
1713         entry->extra_len += rx->skb->len;
1714         if (ieee80211_has_morefrags(fc)) {
1715                 rx->skb = NULL;
1716                 return RX_QUEUED;
1717         }
1718
1719         rx->skb = __skb_dequeue(&entry->skb_list);
1720         if (skb_tailroom(rx->skb) < entry->extra_len) {
1721                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1722                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1723                                               GFP_ATOMIC))) {
1724                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1725                         __skb_queue_purge(&entry->skb_list);
1726                         return RX_DROP_UNUSABLE;
1727                 }
1728         }
1729         while ((skb = __skb_dequeue(&entry->skb_list))) {
1730                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1731                 dev_kfree_skb(skb);
1732         }
1733
1734         /* Complete frame has been reassembled - process it now */
1735         status = IEEE80211_SKB_RXCB(rx->skb);
1736         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1737
1738  out:
1739         if (rx->sta)
1740                 rx->sta->rx_packets++;
1741         if (is_multicast_ether_addr(hdr->addr1))
1742                 rx->local->dot11MulticastReceivedFrameCount++;
1743         else
1744                 ieee80211_led_rx(rx->local);
1745         return RX_CONTINUE;
1746 }
1747
1748 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1749 {
1750         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1751                 return -EACCES;
1752
1753         return 0;
1754 }
1755
1756 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1757 {
1758         struct sk_buff *skb = rx->skb;
1759         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1760
1761         /*
1762          * Pass through unencrypted frames if the hardware has
1763          * decrypted them already.
1764          */
1765         if (status->flag & RX_FLAG_DECRYPTED)
1766                 return 0;
1767
1768         /* Drop unencrypted frames if key is set. */
1769         if (unlikely(!ieee80211_has_protected(fc) &&
1770                      !ieee80211_is_nullfunc(fc) &&
1771                      ieee80211_is_data(fc) &&
1772                      (rx->key || rx->sdata->drop_unencrypted)))
1773                 return -EACCES;
1774
1775         return 0;
1776 }
1777
1778 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1779 {
1780         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1781         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1782         __le16 fc = hdr->frame_control;
1783
1784         /*
1785          * Pass through unencrypted frames if the hardware has
1786          * decrypted them already.
1787          */
1788         if (status->flag & RX_FLAG_DECRYPTED)
1789                 return 0;
1790
1791         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1792                 if (unlikely(!ieee80211_has_protected(fc) &&
1793                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1794                              rx->key)) {
1795                         if (ieee80211_is_deauth(fc) ||
1796                             ieee80211_is_disassoc(fc))
1797                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1798                                                              rx->skb->data,
1799                                                              rx->skb->len);
1800                         return -EACCES;
1801                 }
1802                 /* BIP does not use Protected field, so need to check MMIE */
1803                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1804                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1805                         if (ieee80211_is_deauth(fc) ||
1806                             ieee80211_is_disassoc(fc))
1807                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1808                                                              rx->skb->data,
1809                                                              rx->skb->len);
1810                         return -EACCES;
1811                 }
1812                 /*
1813                  * When using MFP, Action frames are not allowed prior to
1814                  * having configured keys.
1815                  */
1816                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1817                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1818                         return -EACCES;
1819         }
1820
1821         return 0;
1822 }
1823
1824 static int
1825 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1826 {
1827         struct ieee80211_sub_if_data *sdata = rx->sdata;
1828         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1829         bool check_port_control = false;
1830         struct ethhdr *ehdr;
1831         int ret;
1832
1833         *port_control = false;
1834         if (ieee80211_has_a4(hdr->frame_control) &&
1835             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1836                 return -1;
1837
1838         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1839             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1840
1841                 if (!sdata->u.mgd.use_4addr)
1842                         return -1;
1843                 else
1844                         check_port_control = true;
1845         }
1846
1847         if (is_multicast_ether_addr(hdr->addr1) &&
1848             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1849                 return -1;
1850
1851         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1852         if (ret < 0)
1853                 return ret;
1854
1855         ehdr = (struct ethhdr *) rx->skb->data;
1856         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1857                 *port_control = true;
1858         else if (check_port_control)
1859                 return -1;
1860
1861         return 0;
1862 }
1863
1864 /*
1865  * requires that rx->skb is a frame with ethernet header
1866  */
1867 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1868 {
1869         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1870                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1871         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1872
1873         /*
1874          * Allow EAPOL frames to us/the PAE group address regardless
1875          * of whether the frame was encrypted or not.
1876          */
1877         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1878             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1879              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1880                 return true;
1881
1882         if (ieee80211_802_1x_port_control(rx) ||
1883             ieee80211_drop_unencrypted(rx, fc))
1884                 return false;
1885
1886         return true;
1887 }
1888
1889 /*
1890  * requires that rx->skb is a frame with ethernet header
1891  */
1892 static void
1893 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1894 {
1895         struct ieee80211_sub_if_data *sdata = rx->sdata;
1896         struct net_device *dev = sdata->dev;
1897         struct sk_buff *skb, *xmit_skb;
1898         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1899         struct sta_info *dsta;
1900         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1901
1902         skb = rx->skb;
1903         xmit_skb = NULL;
1904
1905         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1906              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1907             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1908             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1909             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1910                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1911                         /*
1912                          * send multicast frames both to higher layers in
1913                          * local net stack and back to the wireless medium
1914                          */
1915                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1916                         if (!xmit_skb)
1917                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1918                                                     dev->name);
1919                 } else {
1920                         dsta = sta_info_get(sdata, skb->data);
1921                         if (dsta) {
1922                                 /*
1923                                  * The destination station is associated to
1924                                  * this AP (in this VLAN), so send the frame
1925                                  * directly to it and do not pass it to local
1926                                  * net stack.
1927                                  */
1928                                 xmit_skb = skb;
1929                                 skb = NULL;
1930                         }
1931                 }
1932         }
1933
1934 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1935         if (skb) {
1936                 /* 'align' will only take the values 0 or 2 here since all
1937                  * frames are required to be aligned to 2-byte boundaries
1938                  * when being passed to mac80211; the code here works just
1939                  * as well if that isn't true, but mac80211 assumes it can
1940                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1941                  */
1942                 int align;
1943
1944                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1945                 if (align) {
1946                         if (WARN_ON(skb_headroom(skb) < 3)) {
1947                                 dev_kfree_skb(skb);
1948                                 skb = NULL;
1949                         } else {
1950                                 u8 *data = skb->data;
1951                                 size_t len = skb_headlen(skb);
1952                                 skb->data -= align;
1953                                 memmove(skb->data, data, len);
1954                                 skb_set_tail_pointer(skb, len);
1955                         }
1956                 }
1957         }
1958 #endif
1959
1960         if (skb) {
1961                 /* deliver to local stack */
1962                 skb->protocol = eth_type_trans(skb, dev);
1963                 memset(skb->cb, 0, sizeof(skb->cb));
1964                 netif_receive_skb(skb);
1965         }
1966
1967         if (xmit_skb) {
1968                 /*
1969                  * Send to wireless media and increase priority by 256 to
1970                  * keep the received priority instead of reclassifying
1971                  * the frame (see cfg80211_classify8021d).
1972                  */
1973                 xmit_skb->priority += 256;
1974                 xmit_skb->protocol = htons(ETH_P_802_3);
1975                 skb_reset_network_header(xmit_skb);
1976                 skb_reset_mac_header(xmit_skb);
1977                 dev_queue_xmit(xmit_skb);
1978         }
1979 }
1980
1981 static ieee80211_rx_result debug_noinline
1982 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1983 {
1984         struct net_device *dev = rx->sdata->dev;
1985         struct sk_buff *skb = rx->skb;
1986         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1987         __le16 fc = hdr->frame_control;
1988         struct sk_buff_head frame_list;
1989         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1990
1991         if (unlikely(!ieee80211_is_data(fc)))
1992                 return RX_CONTINUE;
1993
1994         if (unlikely(!ieee80211_is_data_present(fc)))
1995                 return RX_DROP_MONITOR;
1996
1997         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1998                 return RX_CONTINUE;
1999
2000         if (ieee80211_has_a4(hdr->frame_control) &&
2001             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2002             !rx->sdata->u.vlan.sta)
2003                 return RX_DROP_UNUSABLE;
2004
2005         if (is_multicast_ether_addr(hdr->addr1) &&
2006             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2007               rx->sdata->u.vlan.sta) ||
2008              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2009               rx->sdata->u.mgd.use_4addr)))
2010                 return RX_DROP_UNUSABLE;
2011
2012         skb->dev = dev;
2013         __skb_queue_head_init(&frame_list);
2014
2015         if (skb_linearize(skb))
2016                 return RX_DROP_UNUSABLE;
2017
2018         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2019                                  rx->sdata->vif.type,
2020                                  rx->local->hw.extra_tx_headroom, true);
2021
2022         while (!skb_queue_empty(&frame_list)) {
2023                 rx->skb = __skb_dequeue(&frame_list);
2024
2025                 if (!ieee80211_frame_allowed(rx, fc)) {
2026                         dev_kfree_skb(rx->skb);
2027                         continue;
2028                 }
2029                 dev->stats.rx_packets++;
2030                 dev->stats.rx_bytes += rx->skb->len;
2031
2032                 ieee80211_deliver_skb(rx);
2033         }
2034
2035         return RX_QUEUED;
2036 }
2037
2038 #ifdef CONFIG_MAC80211_MESH
2039 static ieee80211_rx_result
2040 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2041 {
2042         struct ieee80211_hdr *fwd_hdr, *hdr;
2043         struct ieee80211_tx_info *info;
2044         struct ieee80211s_hdr *mesh_hdr;
2045         struct sk_buff *skb = rx->skb, *fwd_skb;
2046         struct ieee80211_local *local = rx->local;
2047         struct ieee80211_sub_if_data *sdata = rx->sdata;
2048         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2049         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2050         u16 q, hdrlen;
2051
2052         hdr = (struct ieee80211_hdr *) skb->data;
2053         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2054
2055         /* make sure fixed part of mesh header is there, also checks skb len */
2056         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2057                 return RX_DROP_MONITOR;
2058
2059         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2060
2061         /* make sure full mesh header is there, also checks skb len */
2062         if (!pskb_may_pull(rx->skb,
2063                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2064                 return RX_DROP_MONITOR;
2065
2066         /* reload pointers */
2067         hdr = (struct ieee80211_hdr *) skb->data;
2068         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2069
2070         /* frame is in RMC, don't forward */
2071         if (ieee80211_is_data(hdr->frame_control) &&
2072             is_multicast_ether_addr(hdr->addr1) &&
2073             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2074                 return RX_DROP_MONITOR;
2075
2076         if (!ieee80211_is_data(hdr->frame_control) ||
2077             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2078                 return RX_CONTINUE;
2079
2080         if (!mesh_hdr->ttl)
2081                 return RX_DROP_MONITOR;
2082
2083         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2084                 struct mesh_path *mppath;
2085                 char *proxied_addr;
2086                 char *mpp_addr;
2087
2088                 if (is_multicast_ether_addr(hdr->addr1)) {
2089                         mpp_addr = hdr->addr3;
2090                         proxied_addr = mesh_hdr->eaddr1;
2091                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2092                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2093                         mpp_addr = hdr->addr4;
2094                         proxied_addr = mesh_hdr->eaddr2;
2095                 } else {
2096                         return RX_DROP_MONITOR;
2097                 }
2098
2099                 rcu_read_lock();
2100                 mppath = mpp_path_lookup(sdata, proxied_addr);
2101                 if (!mppath) {
2102                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2103                 } else {
2104                         spin_lock_bh(&mppath->state_lock);
2105                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2106                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2107                         spin_unlock_bh(&mppath->state_lock);
2108                 }
2109                 rcu_read_unlock();
2110         }
2111
2112         /* Frame has reached destination.  Don't forward */
2113         if (!is_multicast_ether_addr(hdr->addr1) &&
2114             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2115                 return RX_CONTINUE;
2116
2117         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2118         if (ieee80211_queue_stopped(&local->hw, q)) {
2119                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2120                 return RX_DROP_MONITOR;
2121         }
2122         skb_set_queue_mapping(skb, q);
2123
2124         if (!--mesh_hdr->ttl) {
2125                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2126                 goto out;
2127         }
2128
2129         if (!ifmsh->mshcfg.dot11MeshForwarding)
2130                 goto out;
2131
2132         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2133         if (!fwd_skb) {
2134                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2135                                     sdata->name);
2136                 goto out;
2137         }
2138
2139         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2140         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2141         info = IEEE80211_SKB_CB(fwd_skb);
2142         memset(info, 0, sizeof(*info));
2143         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2144         info->control.vif = &rx->sdata->vif;
2145         info->control.jiffies = jiffies;
2146         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2147                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2148                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2149                 /* update power mode indication when forwarding */
2150                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2151         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2152                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2153                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2154         } else {
2155                 /* unable to resolve next hop */
2156                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2157                                    fwd_hdr->addr3, 0,
2158                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2159                                    fwd_hdr->addr2);
2160                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2161                 kfree_skb(fwd_skb);
2162                 return RX_DROP_MONITOR;
2163         }
2164
2165         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2166         ieee80211_add_pending_skb(local, fwd_skb);
2167  out:
2168         if (is_multicast_ether_addr(hdr->addr1) ||
2169             sdata->dev->flags & IFF_PROMISC)
2170                 return RX_CONTINUE;
2171         else
2172                 return RX_DROP_MONITOR;
2173 }
2174 #endif
2175
2176 static ieee80211_rx_result debug_noinline
2177 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2178 {
2179         struct ieee80211_sub_if_data *sdata = rx->sdata;
2180         struct ieee80211_local *local = rx->local;
2181         struct net_device *dev = sdata->dev;
2182         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2183         __le16 fc = hdr->frame_control;
2184         bool port_control;
2185         int err;
2186
2187         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2188                 return RX_CONTINUE;
2189
2190         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2191                 return RX_DROP_MONITOR;
2192
2193         /*
2194          * Send unexpected-4addr-frame event to hostapd. For older versions,
2195          * also drop the frame to cooked monitor interfaces.
2196          */
2197         if (ieee80211_has_a4(hdr->frame_control) &&
2198             sdata->vif.type == NL80211_IFTYPE_AP) {
2199                 if (rx->sta &&
2200                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2201                         cfg80211_rx_unexpected_4addr_frame(
2202                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2203                 return RX_DROP_MONITOR;
2204         }
2205
2206         err = __ieee80211_data_to_8023(rx, &port_control);
2207         if (unlikely(err))
2208                 return RX_DROP_UNUSABLE;
2209
2210         if (!ieee80211_frame_allowed(rx, fc))
2211                 return RX_DROP_MONITOR;
2212
2213         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2214             unlikely(port_control) && sdata->bss) {
2215                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2216                                      u.ap);
2217                 dev = sdata->dev;
2218                 rx->sdata = sdata;
2219         }
2220
2221         rx->skb->dev = dev;
2222
2223         dev->stats.rx_packets++;
2224         dev->stats.rx_bytes += rx->skb->len;
2225
2226         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2227             !is_multicast_ether_addr(
2228                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2229             (!local->scanning &&
2230              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2231                         mod_timer(&local->dynamic_ps_timer, jiffies +
2232                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2233         }
2234
2235         ieee80211_deliver_skb(rx);
2236
2237         return RX_QUEUED;
2238 }
2239
2240 static ieee80211_rx_result debug_noinline
2241 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2242 {
2243         struct sk_buff *skb = rx->skb;
2244         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2245         struct tid_ampdu_rx *tid_agg_rx;
2246         u16 start_seq_num;
2247         u16 tid;
2248
2249         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2250                 return RX_CONTINUE;
2251
2252         if (ieee80211_is_back_req(bar->frame_control)) {
2253                 struct {
2254                         __le16 control, start_seq_num;
2255                 } __packed bar_data;
2256
2257                 if (!rx->sta)
2258                         return RX_DROP_MONITOR;
2259
2260                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2261                                   &bar_data, sizeof(bar_data)))
2262                         return RX_DROP_MONITOR;
2263
2264                 tid = le16_to_cpu(bar_data.control) >> 12;
2265
2266                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2267                 if (!tid_agg_rx)
2268                         return RX_DROP_MONITOR;
2269
2270                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2271
2272                 /* reset session timer */
2273                 if (tid_agg_rx->timeout)
2274                         mod_timer(&tid_agg_rx->session_timer,
2275                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2276
2277                 spin_lock(&tid_agg_rx->reorder_lock);
2278                 /* release stored frames up to start of BAR */
2279                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2280                                                  start_seq_num, frames);
2281                 spin_unlock(&tid_agg_rx->reorder_lock);
2282
2283                 kfree_skb(skb);
2284                 return RX_QUEUED;
2285         }
2286
2287         /*
2288          * After this point, we only want management frames,
2289          * so we can drop all remaining control frames to
2290          * cooked monitor interfaces.
2291          */
2292         return RX_DROP_MONITOR;
2293 }
2294
2295 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2296                                            struct ieee80211_mgmt *mgmt,
2297                                            size_t len)
2298 {
2299         struct ieee80211_local *local = sdata->local;
2300         struct sk_buff *skb;
2301         struct ieee80211_mgmt *resp;
2302
2303         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2304                 /* Not to own unicast address */
2305                 return;
2306         }
2307
2308         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2309             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2310                 /* Not from the current AP or not associated yet. */
2311                 return;
2312         }
2313
2314         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2315                 /* Too short SA Query request frame */
2316                 return;
2317         }
2318
2319         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2320         if (skb == NULL)
2321                 return;
2322
2323         skb_reserve(skb, local->hw.extra_tx_headroom);
2324         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2325         memset(resp, 0, 24);
2326         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2327         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2328         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2329         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2330                                           IEEE80211_STYPE_ACTION);
2331         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2332         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2333         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2334         memcpy(resp->u.action.u.sa_query.trans_id,
2335                mgmt->u.action.u.sa_query.trans_id,
2336                WLAN_SA_QUERY_TR_ID_LEN);
2337
2338         ieee80211_tx_skb(sdata, skb);
2339 }
2340
2341 static ieee80211_rx_result debug_noinline
2342 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2343 {
2344         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2345         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2346
2347         /*
2348          * From here on, look only at management frames.
2349          * Data and control frames are already handled,
2350          * and unknown (reserved) frames are useless.
2351          */
2352         if (rx->skb->len < 24)
2353                 return RX_DROP_MONITOR;
2354
2355         if (!ieee80211_is_mgmt(mgmt->frame_control))
2356                 return RX_DROP_MONITOR;
2357
2358         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2359             ieee80211_is_beacon(mgmt->frame_control) &&
2360             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2361                 int sig = 0;
2362
2363                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2364                         sig = status->signal;
2365
2366                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2367                                             rx->skb->data, rx->skb->len,
2368                                             status->freq, sig);
2369                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2370         }
2371
2372         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2373                 return RX_DROP_MONITOR;
2374
2375         if (ieee80211_drop_unencrypted_mgmt(rx))
2376                 return RX_DROP_UNUSABLE;
2377
2378         return RX_CONTINUE;
2379 }
2380
2381 static ieee80211_rx_result debug_noinline
2382 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2383 {
2384         struct ieee80211_local *local = rx->local;
2385         struct ieee80211_sub_if_data *sdata = rx->sdata;
2386         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2387         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2388         int len = rx->skb->len;
2389
2390         if (!ieee80211_is_action(mgmt->frame_control))
2391                 return RX_CONTINUE;
2392
2393         /* drop too small frames */
2394         if (len < IEEE80211_MIN_ACTION_SIZE)
2395                 return RX_DROP_UNUSABLE;
2396
2397         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2398             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2399             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2400                 return RX_DROP_UNUSABLE;
2401
2402         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2403                 return RX_DROP_UNUSABLE;
2404
2405         switch (mgmt->u.action.category) {
2406         case WLAN_CATEGORY_HT:
2407                 /* reject HT action frames from stations not supporting HT */
2408                 if (!rx->sta->sta.ht_cap.ht_supported)
2409                         goto invalid;
2410
2411                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2412                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2413                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2414                     sdata->vif.type != NL80211_IFTYPE_AP &&
2415                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2416                         break;
2417
2418                 /* verify action & smps_control/chanwidth are present */
2419                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2420                         goto invalid;
2421
2422                 switch (mgmt->u.action.u.ht_smps.action) {
2423                 case WLAN_HT_ACTION_SMPS: {
2424                         struct ieee80211_supported_band *sband;
2425                         enum ieee80211_smps_mode smps_mode;
2426
2427                         /* convert to HT capability */
2428                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2429                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2430                                 smps_mode = IEEE80211_SMPS_OFF;
2431                                 break;
2432                         case WLAN_HT_SMPS_CONTROL_STATIC:
2433                                 smps_mode = IEEE80211_SMPS_STATIC;
2434                                 break;
2435                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2436                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2437                                 break;
2438                         default:
2439                                 goto invalid;
2440                         }
2441
2442                         /* if no change do nothing */
2443                         if (rx->sta->sta.smps_mode == smps_mode)
2444                                 goto handled;
2445                         rx->sta->sta.smps_mode = smps_mode;
2446
2447                         sband = rx->local->hw.wiphy->bands[status->band];
2448
2449                         rate_control_rate_update(local, sband, rx->sta,
2450                                                  IEEE80211_RC_SMPS_CHANGED);
2451                         goto handled;
2452                 }
2453                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2454                         struct ieee80211_supported_band *sband;
2455                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2456                         enum ieee80211_sta_rx_bandwidth new_bw;
2457
2458                         /* If it doesn't support 40 MHz it can't change ... */
2459                         if (!(rx->sta->sta.ht_cap.cap &
2460                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2461                                 goto handled;
2462
2463                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2464                                 new_bw = IEEE80211_STA_RX_BW_20;
2465                         else
2466                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2467
2468                         if (rx->sta->sta.bandwidth == new_bw)
2469                                 goto handled;
2470
2471                         sband = rx->local->hw.wiphy->bands[status->band];
2472
2473                         rate_control_rate_update(local, sband, rx->sta,
2474                                                  IEEE80211_RC_BW_CHANGED);
2475                         goto handled;
2476                 }
2477                 default:
2478                         goto invalid;
2479                 }
2480
2481                 break;
2482         case WLAN_CATEGORY_PUBLIC:
2483                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2484                         goto invalid;
2485                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2486                         break;
2487                 if (!rx->sta)
2488                         break;
2489                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2490                         break;
2491                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2492                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2493                         break;
2494                 if (len < offsetof(struct ieee80211_mgmt,
2495                                    u.action.u.ext_chan_switch.variable))
2496                         goto invalid;
2497                 goto queue;
2498         case WLAN_CATEGORY_VHT:
2499                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2500                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2501                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2502                     sdata->vif.type != NL80211_IFTYPE_AP &&
2503                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2504                         break;
2505
2506                 /* verify action code is present */
2507                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2508                         goto invalid;
2509
2510                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2511                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2512                         u8 opmode;
2513
2514                         /* verify opmode is present */
2515                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2516                                 goto invalid;
2517
2518                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2519
2520                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2521                                                     opmode, status->band,
2522                                                     false);
2523                         goto handled;
2524                 }
2525                 default:
2526                         break;
2527                 }
2528                 break;
2529         case WLAN_CATEGORY_BACK:
2530                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2531                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2532                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2533                     sdata->vif.type != NL80211_IFTYPE_AP &&
2534                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2535                         break;
2536
2537                 /* verify action_code is present */
2538                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2539                         break;
2540
2541                 switch (mgmt->u.action.u.addba_req.action_code) {
2542                 case WLAN_ACTION_ADDBA_REQ:
2543                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2544                                    sizeof(mgmt->u.action.u.addba_req)))
2545                                 goto invalid;
2546                         break;
2547                 case WLAN_ACTION_ADDBA_RESP:
2548                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2549                                    sizeof(mgmt->u.action.u.addba_resp)))
2550                                 goto invalid;
2551                         break;
2552                 case WLAN_ACTION_DELBA:
2553                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2554                                    sizeof(mgmt->u.action.u.delba)))
2555                                 goto invalid;
2556                         break;
2557                 default:
2558                         goto invalid;
2559                 }
2560
2561                 goto queue;
2562         case WLAN_CATEGORY_SPECTRUM_MGMT:
2563                 /* verify action_code is present */
2564                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2565                         break;
2566
2567                 switch (mgmt->u.action.u.measurement.action_code) {
2568                 case WLAN_ACTION_SPCT_MSR_REQ:
2569                         if (status->band != IEEE80211_BAND_5GHZ)
2570                                 break;
2571
2572                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2573                                    sizeof(mgmt->u.action.u.measurement)))
2574                                 break;
2575
2576                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2577                                 break;
2578
2579                         ieee80211_process_measurement_req(sdata, mgmt, len);
2580                         goto handled;
2581                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2582                         u8 *bssid;
2583                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2584                                    sizeof(mgmt->u.action.u.chan_switch)))
2585                                 break;
2586
2587                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2588                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2589                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2590                                 break;
2591
2592                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2593                                 bssid = sdata->u.mgd.bssid;
2594                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2595                                 bssid = sdata->u.ibss.bssid;
2596                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2597                                 bssid = mgmt->sa;
2598                         else
2599                                 break;
2600
2601                         if (!ether_addr_equal(mgmt->bssid, bssid))
2602                                 break;
2603
2604                         goto queue;
2605                         }
2606                 }
2607                 break;
2608         case WLAN_CATEGORY_SA_QUERY:
2609                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2610                            sizeof(mgmt->u.action.u.sa_query)))
2611                         break;
2612
2613                 switch (mgmt->u.action.u.sa_query.action) {
2614                 case WLAN_ACTION_SA_QUERY_REQUEST:
2615                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2616                                 break;
2617                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2618                         goto handled;
2619                 }
2620                 break;
2621         case WLAN_CATEGORY_SELF_PROTECTED:
2622                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2623                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2624                         break;
2625
2626                 switch (mgmt->u.action.u.self_prot.action_code) {
2627                 case WLAN_SP_MESH_PEERING_OPEN:
2628                 case WLAN_SP_MESH_PEERING_CLOSE:
2629                 case WLAN_SP_MESH_PEERING_CONFIRM:
2630                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2631                                 goto invalid;
2632                         if (sdata->u.mesh.user_mpm)
2633                                 /* userspace handles this frame */
2634                                 break;
2635                         goto queue;
2636                 case WLAN_SP_MGK_INFORM:
2637                 case WLAN_SP_MGK_ACK:
2638                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2639                                 goto invalid;
2640                         break;
2641                 }
2642                 break;
2643         case WLAN_CATEGORY_MESH_ACTION:
2644                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2645                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2646                         break;
2647
2648                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2649                         break;
2650                 if (mesh_action_is_path_sel(mgmt) &&
2651                     !mesh_path_sel_is_hwmp(sdata))
2652                         break;
2653                 goto queue;
2654         }
2655
2656         return RX_CONTINUE;
2657
2658  invalid:
2659         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2660         /* will return in the next handlers */
2661         return RX_CONTINUE;
2662
2663  handled:
2664         if (rx->sta)
2665                 rx->sta->rx_packets++;
2666         dev_kfree_skb(rx->skb);
2667         return RX_QUEUED;
2668
2669  queue:
2670         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2671         skb_queue_tail(&sdata->skb_queue, rx->skb);
2672         ieee80211_queue_work(&local->hw, &sdata->work);
2673         if (rx->sta)
2674                 rx->sta->rx_packets++;
2675         return RX_QUEUED;
2676 }
2677
2678 static ieee80211_rx_result debug_noinline
2679 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2680 {
2681         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2682         int sig = 0;
2683
2684         /* skip known-bad action frames and return them in the next handler */
2685         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2686                 return RX_CONTINUE;
2687
2688         /*
2689          * Getting here means the kernel doesn't know how to handle
2690          * it, but maybe userspace does ... include returned frames
2691          * so userspace can register for those to know whether ones
2692          * it transmitted were processed or returned.
2693          */
2694
2695         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2696                 sig = status->signal;
2697
2698         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2699                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2700                 if (rx->sta)
2701                         rx->sta->rx_packets++;
2702                 dev_kfree_skb(rx->skb);
2703                 return RX_QUEUED;
2704         }
2705
2706         return RX_CONTINUE;
2707 }
2708
2709 static ieee80211_rx_result debug_noinline
2710 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2711 {
2712         struct ieee80211_local *local = rx->local;
2713         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2714         struct sk_buff *nskb;
2715         struct ieee80211_sub_if_data *sdata = rx->sdata;
2716         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2717
2718         if (!ieee80211_is_action(mgmt->frame_control))
2719                 return RX_CONTINUE;
2720
2721         /*
2722          * For AP mode, hostapd is responsible for handling any action
2723          * frames that we didn't handle, including returning unknown
2724          * ones. For all other modes we will return them to the sender,
2725          * setting the 0x80 bit in the action category, as required by
2726          * 802.11-2012 9.24.4.
2727          * Newer versions of hostapd shall also use the management frame
2728          * registration mechanisms, but older ones still use cooked
2729          * monitor interfaces so push all frames there.
2730          */
2731         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2732             (sdata->vif.type == NL80211_IFTYPE_AP ||
2733              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2734                 return RX_DROP_MONITOR;
2735
2736         if (is_multicast_ether_addr(mgmt->da))
2737                 return RX_DROP_MONITOR;
2738
2739         /* do not return rejected action frames */
2740         if (mgmt->u.action.category & 0x80)
2741                 return RX_DROP_UNUSABLE;
2742
2743         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2744                                GFP_ATOMIC);
2745         if (nskb) {
2746                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2747
2748                 nmgmt->u.action.category |= 0x80;
2749                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2750                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2751
2752                 memset(nskb->cb, 0, sizeof(nskb->cb));
2753
2754                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2755                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2756
2757                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2758                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2759                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2760                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2761                                 info->hw_queue =
2762                                         local->hw.offchannel_tx_hw_queue;
2763                 }
2764
2765                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2766                                             status->band);
2767         }
2768         dev_kfree_skb(rx->skb);
2769         return RX_QUEUED;
2770 }
2771
2772 static ieee80211_rx_result debug_noinline
2773 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2774 {
2775         struct ieee80211_sub_if_data *sdata = rx->sdata;
2776         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2777         __le16 stype;
2778
2779         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2780
2781         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2782             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2783             sdata->vif.type != NL80211_IFTYPE_STATION)
2784                 return RX_DROP_MONITOR;
2785
2786         switch (stype) {
2787         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2788         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2789         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2790                 /* process for all: mesh, mlme, ibss */
2791                 break;
2792         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2793         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2794         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2795         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2796                 if (is_multicast_ether_addr(mgmt->da) &&
2797                     !is_broadcast_ether_addr(mgmt->da))
2798                         return RX_DROP_MONITOR;
2799
2800                 /* process only for station */
2801                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2802                         return RX_DROP_MONITOR;
2803                 break;
2804         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2805                 /* process only for ibss and mesh */
2806                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2807                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2808                         return RX_DROP_MONITOR;
2809                 break;
2810         default:
2811                 return RX_DROP_MONITOR;
2812         }
2813
2814         /* queue up frame and kick off work to process it */
2815         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2816         skb_queue_tail(&sdata->skb_queue, rx->skb);
2817         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2818         if (rx->sta)
2819                 rx->sta->rx_packets++;
2820
2821         return RX_QUEUED;
2822 }
2823
2824 /* TODO: use IEEE80211_RX_FRAGMENTED */
2825 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2826                                         struct ieee80211_rate *rate)
2827 {
2828         struct ieee80211_sub_if_data *sdata;
2829         struct ieee80211_local *local = rx->local;
2830         struct sk_buff *skb = rx->skb, *skb2;
2831         struct net_device *prev_dev = NULL;
2832         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2833         int needed_headroom;
2834
2835         /*
2836          * If cooked monitor has been processed already, then
2837          * don't do it again. If not, set the flag.
2838          */
2839         if (rx->flags & IEEE80211_RX_CMNTR)
2840                 goto out_free_skb;
2841         rx->flags |= IEEE80211_RX_CMNTR;
2842
2843         /* If there are no cooked monitor interfaces, just free the SKB */
2844         if (!local->cooked_mntrs)
2845                 goto out_free_skb;
2846
2847         /* room for the radiotap header based on driver features */
2848         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2849
2850         if (skb_headroom(skb) < needed_headroom &&
2851             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2852                 goto out_free_skb;
2853
2854         /* prepend radiotap information */
2855         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2856                                          false);
2857
2858         skb_set_mac_header(skb, 0);
2859         skb->ip_summed = CHECKSUM_UNNECESSARY;
2860         skb->pkt_type = PACKET_OTHERHOST;
2861         skb->protocol = htons(ETH_P_802_2);
2862
2863         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2864                 if (!ieee80211_sdata_running(sdata))
2865                         continue;
2866
2867                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2868                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2869                         continue;
2870
2871                 if (prev_dev) {
2872                         skb2 = skb_clone(skb, GFP_ATOMIC);
2873                         if (skb2) {
2874                                 skb2->dev = prev_dev;
2875                                 netif_receive_skb(skb2);
2876                         }
2877                 }
2878
2879                 prev_dev = sdata->dev;
2880                 sdata->dev->stats.rx_packets++;
2881                 sdata->dev->stats.rx_bytes += skb->len;
2882         }
2883
2884         if (prev_dev) {
2885                 skb->dev = prev_dev;
2886                 netif_receive_skb(skb);
2887                 return;
2888         }
2889
2890  out_free_skb:
2891         dev_kfree_skb(skb);
2892 }
2893
2894 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2895                                          ieee80211_rx_result res)
2896 {
2897         switch (res) {
2898         case RX_DROP_MONITOR:
2899                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2900                 if (rx->sta)
2901                         rx->sta->rx_dropped++;
2902                 /* fall through */
2903         case RX_CONTINUE: {
2904                 struct ieee80211_rate *rate = NULL;
2905                 struct ieee80211_supported_band *sband;
2906                 struct ieee80211_rx_status *status;
2907
2908                 status = IEEE80211_SKB_RXCB((rx->skb));
2909
2910                 sband = rx->local->hw.wiphy->bands[status->band];
2911                 if (!(status->flag & RX_FLAG_HT) &&
2912                     !(status->flag & RX_FLAG_VHT))
2913                         rate = &sband->bitrates[status->rate_idx];
2914
2915                 ieee80211_rx_cooked_monitor(rx, rate);
2916                 break;
2917                 }
2918         case RX_DROP_UNUSABLE:
2919                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2920                 if (rx->sta)
2921                         rx->sta->rx_dropped++;
2922                 dev_kfree_skb(rx->skb);
2923                 break;
2924         case RX_QUEUED:
2925                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2926                 break;
2927         }
2928 }
2929
2930 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2931                                   struct sk_buff_head *frames)
2932 {
2933         ieee80211_rx_result res = RX_DROP_MONITOR;
2934         struct sk_buff *skb;
2935
2936 #define CALL_RXH(rxh)                   \
2937         do {                            \
2938                 res = rxh(rx);          \
2939                 if (res != RX_CONTINUE) \
2940                         goto rxh_next;  \
2941         } while (0);
2942
2943         spin_lock_bh(&rx->local->rx_path_lock);
2944
2945         while ((skb = __skb_dequeue(frames))) {
2946                 /*
2947                  * all the other fields are valid across frames
2948                  * that belong to an aMPDU since they are on the
2949                  * same TID from the same station
2950                  */
2951                 rx->skb = skb;
2952
2953                 CALL_RXH(ieee80211_rx_h_check_more_data)
2954                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2955                 CALL_RXH(ieee80211_rx_h_sta_process)
2956                 CALL_RXH(ieee80211_rx_h_decrypt)
2957                 CALL_RXH(ieee80211_rx_h_defragment)
2958                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2959                 /* must be after MMIC verify so header is counted in MPDU mic */
2960 #ifdef CONFIG_MAC80211_MESH
2961                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2962                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2963 #endif
2964                 CALL_RXH(ieee80211_rx_h_amsdu)
2965                 CALL_RXH(ieee80211_rx_h_data)
2966
2967                 /* special treatment -- needs the queue */
2968                 res = ieee80211_rx_h_ctrl(rx, frames);
2969                 if (res != RX_CONTINUE)
2970                         goto rxh_next;
2971
2972                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2973                 CALL_RXH(ieee80211_rx_h_action)
2974                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2975                 CALL_RXH(ieee80211_rx_h_action_return)
2976                 CALL_RXH(ieee80211_rx_h_mgmt)
2977
2978  rxh_next:
2979                 ieee80211_rx_handlers_result(rx, res);
2980
2981 #undef CALL_RXH
2982         }
2983
2984         spin_unlock_bh(&rx->local->rx_path_lock);
2985 }
2986
2987 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2988 {
2989         struct sk_buff_head reorder_release;
2990         ieee80211_rx_result res = RX_DROP_MONITOR;
2991
2992         __skb_queue_head_init(&reorder_release);
2993
2994 #define CALL_RXH(rxh)                   \
2995         do {                            \
2996                 res = rxh(rx);          \
2997                 if (res != RX_CONTINUE) \
2998                         goto rxh_next;  \
2999         } while (0);
3000
3001         CALL_RXH(ieee80211_rx_h_check)
3002
3003         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3004
3005         ieee80211_rx_handlers(rx, &reorder_release);
3006         return;
3007
3008  rxh_next:
3009         ieee80211_rx_handlers_result(rx, res);
3010
3011 #undef CALL_RXH
3012 }
3013
3014 /*
3015  * This function makes calls into the RX path, therefore
3016  * it has to be invoked under RCU read lock.
3017  */
3018 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3019 {
3020         struct sk_buff_head frames;
3021         struct ieee80211_rx_data rx = {
3022                 .sta = sta,
3023                 .sdata = sta->sdata,
3024                 .local = sta->local,
3025                 /* This is OK -- must be QoS data frame */
3026                 .security_idx = tid,
3027                 .seqno_idx = tid,
3028                 .flags = 0,
3029         };
3030         struct tid_ampdu_rx *tid_agg_rx;
3031
3032         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3033         if (!tid_agg_rx)
3034                 return;
3035
3036         __skb_queue_head_init(&frames);
3037
3038         spin_lock(&tid_agg_rx->reorder_lock);
3039         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3040         spin_unlock(&tid_agg_rx->reorder_lock);
3041
3042         ieee80211_rx_handlers(&rx, &frames);
3043 }
3044
3045 /* main receive path */
3046
3047 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3048                                  struct ieee80211_hdr *hdr)
3049 {
3050         struct ieee80211_sub_if_data *sdata = rx->sdata;
3051         struct sk_buff *skb = rx->skb;
3052         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3053         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3054         int multicast = is_multicast_ether_addr(hdr->addr1);
3055
3056         switch (sdata->vif.type) {
3057         case NL80211_IFTYPE_STATION:
3058                 if (!bssid && !sdata->u.mgd.use_4addr)
3059                         return false;
3060                 if (!multicast &&
3061                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3062                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3063                             sdata->u.mgd.use_4addr)
3064                                 return false;
3065                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3066                 }
3067                 break;
3068         case NL80211_IFTYPE_ADHOC:
3069                 if (!bssid)
3070                         return false;
3071                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3072                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3073                         return false;
3074                 if (ieee80211_is_beacon(hdr->frame_control)) {
3075                         return true;
3076                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3077                         return false;
3078                 } else if (!multicast &&
3079                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3080                         if (!(sdata->dev->flags & IFF_PROMISC))
3081                                 return false;
3082                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3083                 } else if (!rx->sta) {
3084                         int rate_idx;
3085                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3086                                 rate_idx = 0; /* TODO: HT/VHT rates */
3087                         else
3088                                 rate_idx = status->rate_idx;
3089                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3090                                                  BIT(rate_idx));
3091                 }
3092                 break;
3093         case NL80211_IFTYPE_MESH_POINT:
3094                 if (!multicast &&
3095                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3096                         if (!(sdata->dev->flags & IFF_PROMISC))
3097                                 return false;
3098
3099                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3100                 }
3101                 break;
3102         case NL80211_IFTYPE_AP_VLAN:
3103         case NL80211_IFTYPE_AP:
3104                 if (!bssid) {
3105                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3106                                 return false;
3107                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3108                         /*
3109                          * Accept public action frames even when the
3110                          * BSSID doesn't match, this is used for P2P
3111                          * and location updates. Note that mac80211
3112                          * itself never looks at these frames.
3113                          */
3114                         if (!multicast &&
3115                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3116                                 return false;
3117                         if (ieee80211_is_public_action(hdr, skb->len))
3118                                 return true;
3119                         if (!ieee80211_is_beacon(hdr->frame_control))
3120                                 return false;
3121                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3122                 }
3123                 break;
3124         case NL80211_IFTYPE_WDS:
3125                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3126                         return false;
3127                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3128                         return false;
3129                 break;
3130         case NL80211_IFTYPE_P2P_DEVICE:
3131                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3132                     !ieee80211_is_probe_req(hdr->frame_control) &&
3133                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3134                     !ieee80211_is_beacon(hdr->frame_control))
3135                         return false;
3136                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3137                     !multicast)
3138                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3139                 break;
3140         default:
3141                 /* should never get here */
3142                 WARN_ON_ONCE(1);
3143                 break;
3144         }
3145
3146         return true;
3147 }
3148
3149 /*
3150  * This function returns whether or not the SKB
3151  * was destined for RX processing or not, which,
3152  * if consume is true, is equivalent to whether
3153  * or not the skb was consumed.
3154  */
3155 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3156                                             struct sk_buff *skb, bool consume)
3157 {
3158         struct ieee80211_local *local = rx->local;
3159         struct ieee80211_sub_if_data *sdata = rx->sdata;
3160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3161         struct ieee80211_hdr *hdr = (void *)skb->data;
3162
3163         rx->skb = skb;
3164         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3165
3166         if (!prepare_for_handlers(rx, hdr))
3167                 return false;
3168
3169         if (!consume) {
3170                 skb = skb_copy(skb, GFP_ATOMIC);
3171                 if (!skb) {
3172                         if (net_ratelimit())
3173                                 wiphy_debug(local->hw.wiphy,
3174                                         "failed to copy skb for %s\n",
3175                                         sdata->name);
3176                         return true;
3177                 }
3178
3179                 rx->skb = skb;
3180         }
3181
3182         ieee80211_invoke_rx_handlers(rx);
3183         return true;
3184 }
3185
3186 /*
3187  * This is the actual Rx frames handler. as it blongs to Rx path it must
3188  * be called with rcu_read_lock protection.
3189  */
3190 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3191                                          struct sk_buff *skb)
3192 {
3193         struct ieee80211_local *local = hw_to_local(hw);
3194         struct ieee80211_sub_if_data *sdata;
3195         struct ieee80211_hdr *hdr;
3196         __le16 fc;
3197         struct ieee80211_rx_data rx;
3198         struct ieee80211_sub_if_data *prev;
3199         struct sta_info *sta, *tmp, *prev_sta;
3200         int err = 0;
3201
3202         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3203         memset(&rx, 0, sizeof(rx));
3204         rx.skb = skb;
3205         rx.local = local;
3206
3207         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3208                 local->dot11ReceivedFragmentCount++;
3209
3210         if (ieee80211_is_mgmt(fc)) {
3211                 /* drop frame if too short for header */
3212                 if (skb->len < ieee80211_hdrlen(fc))
3213                         err = -ENOBUFS;
3214                 else
3215                         err = skb_linearize(skb);
3216         } else {
3217                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3218         }
3219
3220         if (err) {
3221                 dev_kfree_skb(skb);
3222                 return;
3223         }
3224
3225         hdr = (struct ieee80211_hdr *)skb->data;
3226         ieee80211_parse_qos(&rx);
3227         ieee80211_verify_alignment(&rx);
3228
3229         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3230                      ieee80211_is_beacon(hdr->frame_control)))
3231                 ieee80211_scan_rx(local, skb);
3232
3233         if (ieee80211_is_data(fc)) {
3234                 prev_sta = NULL;
3235
3236                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3237                         if (!prev_sta) {
3238                                 prev_sta = sta;
3239                                 continue;
3240                         }
3241
3242                         rx.sta = prev_sta;
3243                         rx.sdata = prev_sta->sdata;
3244                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3245
3246                         prev_sta = sta;
3247                 }
3248
3249                 if (prev_sta) {
3250                         rx.sta = prev_sta;
3251                         rx.sdata = prev_sta->sdata;
3252
3253                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3254                                 return;
3255                         goto out;
3256                 }
3257         }
3258
3259         prev = NULL;
3260
3261         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3262                 if (!ieee80211_sdata_running(sdata))
3263                         continue;
3264
3265                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3266                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3267                         continue;
3268
3269                 /*
3270                  * frame is destined for this interface, but if it's
3271                  * not also for the previous one we handle that after
3272                  * the loop to avoid copying the SKB once too much
3273                  */
3274
3275                 if (!prev) {
3276                         prev = sdata;
3277                         continue;
3278                 }
3279
3280                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3281                 rx.sdata = prev;
3282                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3283
3284                 prev = sdata;
3285         }
3286
3287         if (prev) {
3288                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3289                 rx.sdata = prev;
3290
3291                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3292                         return;
3293         }
3294
3295  out:
3296         dev_kfree_skb(skb);
3297 }
3298
3299 /*
3300  * This is the receive path handler. It is called by a low level driver when an
3301  * 802.11 MPDU is received from the hardware.
3302  */
3303 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3304 {
3305         struct ieee80211_local *local = hw_to_local(hw);
3306         struct ieee80211_rate *rate = NULL;
3307         struct ieee80211_supported_band *sband;
3308         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3309
3310         WARN_ON_ONCE(softirq_count() == 0);
3311
3312         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3313                 goto drop;
3314
3315         sband = local->hw.wiphy->bands[status->band];
3316         if (WARN_ON(!sband))
3317                 goto drop;
3318
3319         /*
3320          * If we're suspending, it is possible although not too likely
3321          * that we'd be receiving frames after having already partially
3322          * quiesced the stack. We can't process such frames then since
3323          * that might, for example, cause stations to be added or other
3324          * driver callbacks be invoked.
3325          */
3326         if (unlikely(local->quiescing || local->suspended))
3327                 goto drop;
3328
3329         /* We might be during a HW reconfig, prevent Rx for the same reason */
3330         if (unlikely(local->in_reconfig))
3331                 goto drop;
3332
3333         /*
3334          * The same happens when we're not even started,
3335          * but that's worth a warning.
3336          */
3337         if (WARN_ON(!local->started))
3338                 goto drop;
3339
3340         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3341                 /*
3342                  * Validate the rate, unless a PLCP error means that
3343                  * we probably can't have a valid rate here anyway.
3344                  */
3345
3346                 if (status->flag & RX_FLAG_HT) {
3347                         /*
3348                          * rate_idx is MCS index, which can be [0-76]
3349                          * as documented on:
3350                          *
3351                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3352                          *
3353                          * Anything else would be some sort of driver or
3354                          * hardware error. The driver should catch hardware
3355                          * errors.
3356                          */
3357                         if (WARN(status->rate_idx > 76,
3358                                  "Rate marked as an HT rate but passed "
3359                                  "status->rate_idx is not "
3360                                  "an MCS index [0-76]: %d (0x%02x)\n",
3361                                  status->rate_idx,
3362                                  status->rate_idx))
3363                                 goto drop;
3364                 } else if (status->flag & RX_FLAG_VHT) {
3365                         if (WARN_ONCE(status->rate_idx > 9 ||
3366                                       !status->vht_nss ||
3367                                       status->vht_nss > 8,
3368                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3369                                       status->rate_idx, status->vht_nss))
3370                                 goto drop;
3371                 } else {
3372                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3373                                 goto drop;
3374                         rate = &sband->bitrates[status->rate_idx];
3375                 }
3376         }
3377
3378         status->rx_flags = 0;
3379
3380         /*
3381          * key references and virtual interfaces are protected using RCU
3382          * and this requires that we are in a read-side RCU section during
3383          * receive processing
3384          */
3385         rcu_read_lock();
3386
3387         /*
3388          * Frames with failed FCS/PLCP checksum are not returned,
3389          * all other frames are returned without radiotap header
3390          * if it was previously present.
3391          * Also, frames with less than 16 bytes are dropped.
3392          */
3393         skb = ieee80211_rx_monitor(local, skb, rate);
3394         if (!skb) {
3395                 rcu_read_unlock();
3396                 return;
3397         }
3398
3399         ieee80211_tpt_led_trig_rx(local,
3400                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3401                         skb->len);
3402         __ieee80211_rx_handle_packet(hw, skb);
3403
3404         rcu_read_unlock();
3405
3406         return;
3407  drop:
3408         kfree_skb(skb);
3409 }
3410 EXPORT_SYMBOL(ieee80211_rx);
3411
3412 /* This is a version of the rx handler that can be called from hard irq
3413  * context. Post the skb on the queue and schedule the tasklet */
3414 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3415 {
3416         struct ieee80211_local *local = hw_to_local(hw);
3417
3418         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3419
3420         skb->pkt_type = IEEE80211_RX_MSG;
3421         skb_queue_tail(&local->skb_queue, skb);
3422         tasklet_schedule(&local->tasklet);
3423 }
3424 EXPORT_SYMBOL(ieee80211_rx_irqsafe);