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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/jiffies.h>
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/export.h>
  22 #include <linux/bitops.h>
  23 #include <net/mac80211.h>
  24 #include <net/ieee80211_radiotap.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "led.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wpa.h"
  33 #include "tkip.h"
  34 #include "wme.h"
  35 #include "rate.h"
  36
  37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  38 {
  39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  40
  41         u64_stats_update_begin(&tstats->syncp);
  42         tstats->rx_packets++;
  43         tstats->rx_bytes += len;
  44         u64_stats_update_end(&tstats->syncp);
  45 }
  46
  47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  48                                enum nl80211_iftype type)
  49 {
  50         __le16 fc = hdr->frame_control;
  51
  52         if (ieee80211_is_data(fc)) {
  53                 if (len < 24) /* drop incorrect hdr len (data) */
  54                         return NULL;
  55
  56                 if (ieee80211_has_a4(fc))
  57                         return NULL;
  58                 if (ieee80211_has_tods(fc))
  59                         return hdr->addr1;
  60                 if (ieee80211_has_fromds(fc))
  61                         return hdr->addr2;
  62
  63                 return hdr->addr3;
  64         }
  65
  66         if (ieee80211_is_mgmt(fc)) {
  67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  68                         return NULL;
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_ctl(fc)) {
  73                 if (ieee80211_is_pspoll(fc))
  74                         return hdr->addr1;
  75
  76                 if (ieee80211_is_back_req(fc)) {
  77                         switch (type) {
  78                         case NL80211_IFTYPE_STATION:
  79                                 return hdr->addr2;
  80                         case NL80211_IFTYPE_AP:
  81                         case NL80211_IFTYPE_AP_VLAN:
  82                                 return hdr->addr1;
  83                         default:
  84                                 break; /* fall through to the return */
  85                         }
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 /*
  93  * monitor mode reception
  94  *
  95  * This function cleans up the SKB, i.e. it removes all the stuff
  96  * only useful for monitoring.
  97  */
  98 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
  99                                            struct sk_buff *skb,
 100                                            unsigned int rtap_vendor_space)
 101 {
 102         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 103                 if (likely(skb->len > FCS_LEN))
 104                         __pskb_trim(skb, skb->len - FCS_LEN);
 105                 else {
 106                         /* driver bug */
 107                         WARN_ON(1);
 108                         dev_kfree_skb(skb);
 109                         return NULL;
 110                 }
 111         }
 112
 113         __pskb_pull(skb, rtap_vendor_space);
 114
 115         return skb;
 116 }
 117
 118 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 119                                      unsigned int rtap_vendor_space)
 120 {
 121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 122         struct ieee80211_hdr *hdr;
 123
 124         hdr = (void *)(skb->data + rtap_vendor_space);
 125
 126         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 127                             RX_FLAG_FAILED_PLCP_CRC |
 128                             RX_FLAG_ONLY_MONITOR))
 129                 return true;
 130
 131         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 132                 return true;
 133
 134         if (ieee80211_is_ctl(hdr->frame_control) &&
 135             !ieee80211_is_pspoll(hdr->frame_control) &&
 136             !ieee80211_is_back_req(hdr->frame_control))
 137                 return true;
 138
 139         return false;
 140 }
 141
 142 static int
 143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 144                              struct ieee80211_rx_status *status,
 145                              struct sk_buff *skb)
 146 {
 147         int len;
 148
 149         /* always present fields */
 150         len = sizeof(struct ieee80211_radiotap_header) + 8;
 151
 152         /* allocate extra bitmaps */
 153         if (status->chains)
 154                 len += 4 * hweight8(status->chains);
 155
 156         if (ieee80211_have_rx_timestamp(status)) {
 157                 len = ALIGN(len, 8);
 158                 len += 8;
 159         }
 160         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 161                 len += 1;
 162
 163         /* antenna field, if we don't have per-chain info */
 164         if (!status->chains)
 165                 len += 1;
 166
 167         /* padding for RX_FLAGS if necessary */
 168         len = ALIGN(len, 2);
 169
 170         if (status->flag & RX_FLAG_HT) /* HT info */
 171                 len += 3;
 172
 173         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 174                 len = ALIGN(len, 4);
 175                 len += 8;
 176         }
 177
 178         if (status->flag & RX_FLAG_VHT) {
 179                 len = ALIGN(len, 2);
 180                 len += 12;
 181         }
 182
 183         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 184                 len = ALIGN(len, 8);
 185                 len += 12;
 186         }
 187
 188         if (status->chains) {
 189                 /* antenna and antenna signal fields */
 190                 len += 2 * hweight8(status->chains);
 191         }
 192
 193         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 194                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 195
 196                 /* vendor presence bitmap */
 197                 len += 4;
 198                 /* alignment for fixed 6-byte vendor data header */
 199                 len = ALIGN(len, 2);
 200                 /* vendor data header */
 201                 len += 6;
 202                 if (WARN_ON(rtap->align == 0))
 203                         rtap->align = 1;
 204                 len = ALIGN(len, rtap->align);
 205                 len += rtap->len + rtap->pad;
 206         }
 207
 208         return len;
 209 }
 210
 211 /*
 212  * ieee80211_add_rx_radiotap_header - add radiotap header
 213  *
 214  * add a radiotap header containing all the fields which the hardware provided.
 215  */
 216 static void
 217 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 218                                  struct sk_buff *skb,
 219                                  struct ieee80211_rate *rate,
 220                                  int rtap_len, bool has_fcs)
 221 {
 222         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 223         struct ieee80211_radiotap_header *rthdr;
 224         unsigned char *pos;
 225         __le32 *it_present;
 226         u32 it_present_val;
 227         u16 rx_flags = 0;
 228         u16 channel_flags = 0;
 229         int mpdulen, chain;
 230         unsigned long chains = status->chains;
 231         struct ieee80211_vendor_radiotap rtap = {};
 232
 233         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 234                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 235                 /* rtap.len and rtap.pad are undone immediately */
 236                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 237         }
 238
 239         mpdulen = skb->len;
 240         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 241                 mpdulen += FCS_LEN;
 242
 243         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 244         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 245         it_present = &rthdr->it_present;
 246
 247         /* radiotap header, set always present flags */
 248         rthdr->it_len = cpu_to_le16(rtap_len);
 249         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 250                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 251                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 252
 253         if (!status->chains)
 254                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 255
 256         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 257                 it_present_val |=
 258                         BIT(IEEE80211_RADIOTAP_EXT) |
 259                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 260                 put_unaligned_le32(it_present_val, it_present);
 261                 it_present++;
 262                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 263                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 264         }
 265
 266         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 267                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 268                                   BIT(IEEE80211_RADIOTAP_EXT);
 269                 put_unaligned_le32(it_present_val, it_present);
 270                 it_present++;
 271                 it_present_val = rtap.present;
 272         }
 273
 274         put_unaligned_le32(it_present_val, it_present);
 275
 276         pos = (void *)(it_present + 1);
 277
 278         /* the order of the following fields is important */
 279
 280         /* IEEE80211_RADIOTAP_TSFT */
 281         if (ieee80211_have_rx_timestamp(status)) {
 282                 /* padding */
 283                 while ((pos - (u8 *)rthdr) & 7)
 284                         *pos++ = 0;
 285                 put_unaligned_le64(
 286                         ieee80211_calculate_rx_timestamp(local, status,
 287                                                          mpdulen, 0),
 288                         pos);
 289                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 290                 pos += 8;
 291         }
 292
 293         /* IEEE80211_RADIOTAP_FLAGS */
 294         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 295                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 296         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 297                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 298         if (status->flag & RX_FLAG_SHORTPRE)
 299                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 300         pos++;
 301
 302         /* IEEE80211_RADIOTAP_RATE */
 303         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
 304                 /*
 305                  * Without rate information don't add it. If we have,
 306                  * MCS information is a separate field in radiotap,
 307                  * added below. The byte here is needed as padding
 308                  * for the channel though, so initialise it to 0.
 309                  */
 310                 *pos = 0;
 311         } else {
 312                 int shift = 0;
 313                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 314                 if (status->flag & RX_FLAG_10MHZ)
 315                         shift = 1;
 316                 else if (status->flag & RX_FLAG_5MHZ)
 317                         shift = 2;
 318                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 319         }
 320         pos++;
 321
 322         /* IEEE80211_RADIOTAP_CHANNEL */
 323         put_unaligned_le16(status->freq, pos);
 324         pos += 2;
 325         if (status->flag & RX_FLAG_10MHZ)
 326                 channel_flags |= IEEE80211_CHAN_HALF;
 327         else if (status->flag & RX_FLAG_5MHZ)
 328                 channel_flags |= IEEE80211_CHAN_QUARTER;
 329
 330         if (status->band == NL80211_BAND_5GHZ)
 331                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 332         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
 333                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 334         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 335                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 336         else if (rate)
 337                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 338         else
 339                 channel_flags |= IEEE80211_CHAN_2GHZ;
 340         put_unaligned_le16(channel_flags, pos);
 341         pos += 2;
 342
 343         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 344         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 345             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 346                 *pos = status->signal;
 347                 rthdr->it_present |=
 348                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 349                 pos++;
 350         }
 351
 352         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 353
 354         if (!status->chains) {
 355                 /* IEEE80211_RADIOTAP_ANTENNA */
 356                 *pos = status->antenna;
 357                 pos++;
 358         }
 359
 360         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 361
 362         /* IEEE80211_RADIOTAP_RX_FLAGS */
 363         /* ensure 2 byte alignment for the 2 byte field as required */
 364         if ((pos - (u8 *)rthdr) & 1)
 365                 *pos++ = 0;
 366         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 367                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 368         put_unaligned_le16(rx_flags, pos);
 369         pos += 2;
 370
 371         if (status->flag & RX_FLAG_HT) {
 372                 unsigned int stbc;
 373
 374                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 375                 *pos++ = local->hw.radiotap_mcs_details;
 376                 *pos = 0;
 377                 if (status->flag & RX_FLAG_SHORT_GI)
 378                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 379                 if (status->flag & RX_FLAG_40MHZ)
 380                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 381                 if (status->flag & RX_FLAG_HT_GF)
 382                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 383                 if (status->flag & RX_FLAG_LDPC)
 384                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 385                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
 386                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 387                 pos++;
 388                 *pos++ = status->rate_idx;
 389         }
 390
 391         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 392                 u16 flags = 0;
 393
 394                 /* ensure 4 byte alignment */
 395                 while ((pos - (u8 *)rthdr) & 3)
 396                         pos++;
 397                 rthdr->it_present |=
 398                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 399                 put_unaligned_le32(status->ampdu_reference, pos);
 400                 pos += 4;
 401                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 402                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 403                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 404                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 405                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 406                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 407                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 408                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 409                 put_unaligned_le16(flags, pos);
 410                 pos += 2;
 411                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 412                         *pos++ = status->ampdu_delimiter_crc;
 413                 else
 414                         *pos++ = 0;
 415                 *pos++ = 0;
 416         }
 417
 418         if (status->flag & RX_FLAG_VHT) {
 419                 u16 known = local->hw.radiotap_vht_details;
 420
 421                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 422                 put_unaligned_le16(known, pos);
 423                 pos += 2;
 424                 /* flags */
 425                 if (status->flag & RX_FLAG_SHORT_GI)
 426                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 427                 /* in VHT, STBC is binary */
 428                 if (status->flag & RX_FLAG_STBC_MASK)
 429                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 430                 if (status->vht_flag & RX_VHT_FLAG_BF)
 431                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 432                 pos++;
 433                 /* bandwidth */
 434                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
 435                         *pos++ = 4;
 436                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
 437                         *pos++ = 11;
 438                 else if (status->flag & RX_FLAG_40MHZ)
 439                         *pos++ = 1;
 440                 else /* 20 MHz */
 441                         *pos++ = 0;
 442                 /* MCS/NSS */
 443                 *pos = (status->rate_idx << 4) | status->vht_nss;
 444                 pos += 4;
 445                 /* coding field */
 446                 if (status->flag & RX_FLAG_LDPC)
 447                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 448                 pos++;
 449                 /* group ID */
 450                 pos++;
 451                 /* partial_aid */
 452                 pos += 2;
 453         }
 454
 455         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 456                 u16 accuracy = 0;
 457                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 458
 459                 rthdr->it_present |=
 460                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 461
 462                 /* ensure 8 byte alignment */
 463                 while ((pos - (u8 *)rthdr) & 7)
 464                         pos++;
 465
 466                 put_unaligned_le64(status->device_timestamp, pos);
 467                 pos += sizeof(u64);
 468
 469                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 470                         accuracy = local->hw.radiotap_timestamp.accuracy;
 471                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 472                 }
 473                 put_unaligned_le16(accuracy, pos);
 474                 pos += sizeof(u16);
 475
 476                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 477                 *pos++ = flags;
 478         }
 479
 480         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 481                 *pos++ = status->chain_signal[chain];
 482                 *pos++ = chain;
 483         }
 484
 485         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 486                 /* ensure 2 byte alignment for the vendor field as required */
 487                 if ((pos - (u8 *)rthdr) & 1)
 488                         *pos++ = 0;
 489                 *pos++ = rtap.oui[0];
 490                 *pos++ = rtap.oui[1];
 491                 *pos++ = rtap.oui[2];
 492                 *pos++ = rtap.subns;
 493                 put_unaligned_le16(rtap.len, pos);
 494                 pos += 2;
 495                 /* align the actual payload as requested */
 496                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 497                         *pos++ = 0;
 498                 /* data (and possible padding) already follows */
 499         }
 500 }
 501
 502 /*
 503  * This function copies a received frame to all monitor interfaces and
 504  * returns a cleaned-up SKB that no longer includes the FCS nor the
 505  * radiotap header the driver might have added.
 506  */
 507 static struct sk_buff *
 508 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 509                      struct ieee80211_rate *rate)
 510 {
 511         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 512         struct ieee80211_sub_if_data *sdata;
 513         int rt_hdrlen, needed_headroom;
 514         struct sk_buff *skb, *skb2;
 515         struct net_device *prev_dev = NULL;
 516         int present_fcs_len = 0;
 517         unsigned int rtap_vendor_space = 0;
 518         struct ieee80211_mgmt *mgmt;
 519         struct ieee80211_sub_if_data *monitor_sdata =
 520                 rcu_dereference(local->monitor_sdata);
 521
 522         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 523                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 524
 525                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 526         }
 527
 528         /*
 529          * First, we may need to make a copy of the skb because
 530          *  (1) we need to modify it for radiotap (if not present), and
 531          *  (2) the other RX handlers will modify the skb we got.
 532          *
 533          * We don't need to, of course, if we aren't going to return
 534          * the SKB because it has a bad FCS/PLCP checksum.
 535          */
 536
 537         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 538                 present_fcs_len = FCS_LEN;
 539
 540         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 541         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 542                 dev_kfree_skb(origskb);
 543                 return NULL;
 544         }
 545
 546         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 547                 if (should_drop_frame(origskb, present_fcs_len,
 548                                       rtap_vendor_space)) {
 549                         dev_kfree_skb(origskb);
 550                         return NULL;
 551                 }
 552
 553                 return remove_monitor_info(local, origskb, rtap_vendor_space);
 554         }
 555
 556         /* room for the radiotap header based on driver features */
 557         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
 558         needed_headroom = rt_hdrlen - rtap_vendor_space;
 559
 560         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
 561                 /* only need to expand headroom if necessary */
 562                 skb = origskb;
 563                 origskb = NULL;
 564
 565                 /*
 566                  * This shouldn't trigger often because most devices have an
 567                  * RX header they pull before we get here, and that should
 568                  * be big enough for our radiotap information. We should
 569                  * probably export the length to drivers so that we can have
 570                  * them allocate enough headroom to start with.
 571                  */
 572                 if (skb_headroom(skb) < needed_headroom &&
 573                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 574                         dev_kfree_skb(skb);
 575                         return NULL;
 576                 }
 577         } else {
 578                 /*
 579                  * Need to make a copy and possibly remove radiotap header
 580                  * and FCS from the original.
 581                  */
 582                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
 583
 584                 origskb = remove_monitor_info(local, origskb,
 585                                               rtap_vendor_space);
 586
 587                 if (!skb)
 588                         return origskb;
 589         }
 590
 591         /* prepend radiotap information */
 592         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 593
 594         skb_reset_mac_header(skb);
 595         skb->ip_summed = CHECKSUM_UNNECESSARY;
 596         skb->pkt_type = PACKET_OTHERHOST;
 597         skb->protocol = htons(ETH_P_802_2);
 598
 599         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 600                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 601                         continue;
 602
 603                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 604                         continue;
 605
 606                 if (!ieee80211_sdata_running(sdata))
 607                         continue;
 608
 609                 if (prev_dev) {
 610                         skb2 = skb_clone(skb, GFP_ATOMIC);
 611                         if (skb2) {
 612                                 skb2->dev = prev_dev;
 613                                 netif_receive_skb(skb2);
 614                         }
 615                 }
 616
 617                 prev_dev = sdata->dev;
 618                 ieee80211_rx_stats(sdata->dev, skb->len);
 619         }
 620
 621         mgmt = (void *)skb->data;
 622         if (monitor_sdata &&
 623             skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
 624             ieee80211_is_action(mgmt->frame_control) &&
 625             mgmt->u.action.category == WLAN_CATEGORY_VHT &&
 626             mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
 627             is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
 628             ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
 629                 struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
 630
 631                 if (mu_skb) {
 632                         mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 633                         skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
 634                         ieee80211_queue_work(&local->hw, &monitor_sdata->work);
 635                 }
 636         }
 637
 638         if (prev_dev) {
 639                 skb->dev = prev_dev;
 640                 netif_receive_skb(skb);
 641         } else
 642                 dev_kfree_skb(skb);
 643
 644         return origskb;
 645 }
 646
 647 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 648 {
 649         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 650         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 651         int tid, seqno_idx, security_idx;
 652
 653         /* does the frame have a qos control field? */
 654         if (ieee80211_is_data_qos(hdr->frame_control)) {
 655                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 656                 /* frame has qos control */
 657                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 658                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 659                         status->rx_flags |= IEEE80211_RX_AMSDU;
 660
 661                 seqno_idx = tid;
 662                 security_idx = tid;
 663         } else {
 664                 /*
 665                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 666                  *
 667                  *      Sequence numbers for management frames, QoS data
 668                  *      frames with a broadcast/multicast address in the
 669                  *      Address 1 field, and all non-QoS data frames sent
 670                  *      by QoS STAs are assigned using an additional single
 671                  *      modulo-4096 counter, [...]
 672                  *
 673                  * We also use that counter for non-QoS STAs.
 674                  */
 675                 seqno_idx = IEEE80211_NUM_TIDS;
 676                 security_idx = 0;
 677                 if (ieee80211_is_mgmt(hdr->frame_control))
 678                         security_idx = IEEE80211_NUM_TIDS;
 679                 tid = 0;
 680         }
 681
 682         rx->seqno_idx = seqno_idx;
 683         rx->security_idx = security_idx;
 684         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 685          * For now, set skb->priority to 0 for other cases. */
 686         rx->skb->priority = (tid > 7) ? 0 : tid;
 687 }
 688
 689 /**
 690  * DOC: Packet alignment
 691  *
 692  * Drivers always need to pass packets that are aligned to two-byte boundaries
 693  * to the stack.
 694  *
 695  * Additionally, should, if possible, align the payload data in a way that
 696  * guarantees that the contained IP header is aligned to a four-byte
 697  * boundary. In the case of regular frames, this simply means aligning the
 698  * payload to a four-byte boundary (because either the IP header is directly
 699  * contained, or IV/RFC1042 headers that have a length divisible by four are
 700  * in front of it).  If the payload data is not properly aligned and the
 701  * architecture doesn't support efficient unaligned operations, mac80211
 702  * will align the data.
 703  *
 704  * With A-MSDU frames, however, the payload data address must yield two modulo
 705  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 706  * push the IP header further back to a multiple of four again. Thankfully, the
 707  * specs were sane enough this time around to require padding each A-MSDU
 708  * subframe to a length that is a multiple of four.
 709  *
 710  * Padding like Atheros hardware adds which is between the 802.11 header and
 711  * the payload is not supported, the driver is required to move the 802.11
 712  * header to be directly in front of the payload in that case.
 713  */
 714 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 715 {
 716 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 717         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 718 #endif
 719 }
 720
 721
 722 /* rx handlers */
 723
 724 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 725 {
 726         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 727
 728         if (is_multicast_ether_addr(hdr->addr1))
 729                 return 0;
 730
 731         return ieee80211_is_robust_mgmt_frame(skb);
 732 }
 733
 734
 735 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 736 {
 737         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 738
 739         if (!is_multicast_ether_addr(hdr->addr1))
 740                 return 0;
 741
 742         return ieee80211_is_robust_mgmt_frame(skb);
 743 }
 744
 745
 746 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 747 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 748 {
 749         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 750         struct ieee80211_mmie *mmie;
 751         struct ieee80211_mmie_16 *mmie16;
 752
 753         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 754                 return -1;
 755
 756         if (!ieee80211_is_robust_mgmt_frame(skb))
 757                 return -1; /* not a robust management frame */
 758
 759         mmie = (struct ieee80211_mmie *)
 760                 (skb->data + skb->len - sizeof(*mmie));
 761         if (mmie->element_id == WLAN_EID_MMIE &&
 762             mmie->length == sizeof(*mmie) - 2)
 763                 return le16_to_cpu(mmie->key_id);
 764
 765         mmie16 = (struct ieee80211_mmie_16 *)
 766                 (skb->data + skb->len - sizeof(*mmie16));
 767         if (skb->len >= 24 + sizeof(*mmie16) &&
 768             mmie16->element_id == WLAN_EID_MMIE &&
 769             mmie16->length == sizeof(*mmie16) - 2)
 770                 return le16_to_cpu(mmie16->key_id);
 771
 772         return -1;
 773 }
 774
 775 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 776                                   struct sk_buff *skb)
 777 {
 778         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 779         __le16 fc;
 780         int hdrlen;
 781         u8 keyid;
 782
 783         fc = hdr->frame_control;
 784         hdrlen = ieee80211_hdrlen(fc);
 785
 786         if (skb->len < hdrlen + cs->hdr_len)
 787                 return -EINVAL;
 788
 789         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 790         keyid &= cs->key_idx_mask;
 791         keyid >>= cs->key_idx_shift;
 792
 793         return keyid;
 794 }
 795
 796 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 797 {
 798         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 799         char *dev_addr = rx->sdata->vif.addr;
 800
 801         if (ieee80211_is_data(hdr->frame_control)) {
 802                 if (is_multicast_ether_addr(hdr->addr1)) {
 803                         if (ieee80211_has_tods(hdr->frame_control) ||
 804                             !ieee80211_has_fromds(hdr->frame_control))
 805                                 return RX_DROP_MONITOR;
 806                         if (ether_addr_equal(hdr->addr3, dev_addr))
 807                                 return RX_DROP_MONITOR;
 808                 } else {
 809                         if (!ieee80211_has_a4(hdr->frame_control))
 810                                 return RX_DROP_MONITOR;
 811                         if (ether_addr_equal(hdr->addr4, dev_addr))
 812                                 return RX_DROP_MONITOR;
 813                 }
 814         }
 815
 816         /* If there is not an established peer link and this is not a peer link
 817          * establisment frame, beacon or probe, drop the frame.
 818          */
 819
 820         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 821                 struct ieee80211_mgmt *mgmt;
 822
 823                 if (!ieee80211_is_mgmt(hdr->frame_control))
 824                         return RX_DROP_MONITOR;
 825
 826                 if (ieee80211_is_action(hdr->frame_control)) {
 827                         u8 category;
 828
 829                         /* make sure category field is present */
 830                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 831                                 return RX_DROP_MONITOR;
 832
 833                         mgmt = (struct ieee80211_mgmt *)hdr;
 834                         category = mgmt->u.action.category;
 835                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 836                             category != WLAN_CATEGORY_SELF_PROTECTED)
 837                                 return RX_DROP_MONITOR;
 838                         return RX_CONTINUE;
 839                 }
 840
 841                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 842                     ieee80211_is_probe_resp(hdr->frame_control) ||
 843                     ieee80211_is_beacon(hdr->frame_control) ||
 844                     ieee80211_is_auth(hdr->frame_control))
 845                         return RX_CONTINUE;
 846
 847                 return RX_DROP_MONITOR;
 848         }
 849
 850         return RX_CONTINUE;
 851 }
 852
 853 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 854                                               int index)
 855 {
 856         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 857         struct sk_buff *tail = skb_peek_tail(frames);
 858         struct ieee80211_rx_status *status;
 859
 860         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 861                 return true;
 862
 863         if (!tail)
 864                 return false;
 865
 866         status = IEEE80211_SKB_RXCB(tail);
 867         if (status->flag & RX_FLAG_AMSDU_MORE)
 868                 return false;
 869
 870         return true;
 871 }
 872
 873 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 874                                             struct tid_ampdu_rx *tid_agg_rx,
 875                                             int index,
 876                                             struct sk_buff_head *frames)
 877 {
 878         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 879         struct sk_buff *skb;
 880         struct ieee80211_rx_status *status;
 881
 882         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 883
 884         if (skb_queue_empty(skb_list))
 885                 goto no_frame;
 886
 887         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 888                 __skb_queue_purge(skb_list);
 889                 goto no_frame;
 890         }
 891
 892         /* release frames from the reorder ring buffer */
 893         tid_agg_rx->stored_mpdu_num--;
 894         while ((skb = __skb_dequeue(skb_list))) {
 895                 status = IEEE80211_SKB_RXCB(skb);
 896                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 897                 __skb_queue_tail(frames, skb);
 898         }
 899
 900 no_frame:
 901         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 902         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 903 }
 904
 905 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 906                                              struct tid_ampdu_rx *tid_agg_rx,
 907                                              u16 head_seq_num,
 908                                              struct sk_buff_head *frames)
 909 {
 910         int index;
 911
 912         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 913
 914         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 915                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 916                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 917                                                 frames);
 918         }
 919 }
 920
 921 /*
 922  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 923  * the skb was added to the buffer longer than this time ago, the earlier
 924  * frames that have not yet been received are assumed to be lost and the skb
 925  * can be released for processing. This may also release other skb's from the
 926  * reorder buffer if there are no additional gaps between the frames.
 927  *
 928  * Callers must hold tid_agg_rx->reorder_lock.
 929  */
 930 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 931
 932 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 933                                           struct tid_ampdu_rx *tid_agg_rx,
 934                                           struct sk_buff_head *frames)
 935 {
 936         int index, i, j;
 937
 938         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 939
 940         /* release the buffer until next missing frame */
 941         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 942         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 943             tid_agg_rx->stored_mpdu_num) {
 944                 /*
 945                  * No buffers ready to be released, but check whether any
 946                  * frames in the reorder buffer have timed out.
 947                  */
 948                 int skipped = 1;
 949                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
 950                      j = (j + 1) % tid_agg_rx->buf_size) {
 951                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
 952                                 skipped++;
 953                                 continue;
 954                         }
 955                         if (skipped &&
 956                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
 957                                         HT_RX_REORDER_BUF_TIMEOUT))
 958                                 goto set_release_timer;
 959
 960                         /* don't leave incomplete A-MSDUs around */
 961                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
 962                              i = (i + 1) % tid_agg_rx->buf_size)
 963                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
 964
 965                         ht_dbg_ratelimited(sdata,
 966                                            "release an RX reorder frame due to timeout on earlier frames\n");
 967                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
 968                                                         frames);
 969
 970                         /*
 971                          * Increment the head seq# also for the skipped slots.
 972                          */
 973                         tid_agg_rx->head_seq_num =
 974                                 (tid_agg_rx->head_seq_num +
 975                                  skipped) & IEEE80211_SN_MASK;
 976                         skipped = 0;
 977                 }
 978         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 979                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 980                                                 frames);
 981                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 982         }
 983
 984         if (tid_agg_rx->stored_mpdu_num) {
 985                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 986
 987                 for (; j != (index - 1) % tid_agg_rx->buf_size;
 988                      j = (j + 1) % tid_agg_rx->buf_size) {
 989                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
 990                                 break;
 991                 }
 992
 993  set_release_timer:
 994
 995                 if (!tid_agg_rx->removed)
 996                         mod_timer(&tid_agg_rx->reorder_timer,
 997                                   tid_agg_rx->reorder_time[j] + 1 +
 998                                   HT_RX_REORDER_BUF_TIMEOUT);
 999         } else {
1000                 del_timer(&tid_agg_rx->reorder_timer);
1001         }
1002 }
1003
1004 /*
1005  * As this function belongs to the RX path it must be under
1006  * rcu_read_lock protection. It returns false if the frame
1007  * can be processed immediately, true if it was consumed.
1008  */
1009 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1010                                              struct tid_ampdu_rx *tid_agg_rx,
1011                                              struct sk_buff *skb,
1012                                              struct sk_buff_head *frames)
1013 {
1014         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1015         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1017         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1018         u16 head_seq_num, buf_size;
1019         int index;
1020         bool ret = true;
1021
1022         spin_lock(&tid_agg_rx->reorder_lock);
1023
1024         /*
1025          * Offloaded BA sessions have no known starting sequence number so pick
1026          * one from first Rxed frame for this tid after BA was started.
1027          */
1028         if (unlikely(tid_agg_rx->auto_seq)) {
1029                 tid_agg_rx->auto_seq = false;
1030                 tid_agg_rx->ssn = mpdu_seq_num;
1031                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1032         }
1033
1034         buf_size = tid_agg_rx->buf_size;
1035         head_seq_num = tid_agg_rx->head_seq_num;
1036
1037         /* frame with out of date sequence number */
1038         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1039                 dev_kfree_skb(skb);
1040                 goto out;
1041         }
1042
1043         /*
1044          * If frame the sequence number exceeds our buffering window
1045          * size release some previous frames to make room for this one.
1046          */
1047         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1048                 head_seq_num = ieee80211_sn_inc(
1049                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1050                 /* release stored frames up to new head to stack */
1051                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1052                                                  head_seq_num, frames);
1053         }
1054
1055         /* Now the new frame is always in the range of the reordering buffer */
1056
1057         index = mpdu_seq_num % tid_agg_rx->buf_size;
1058
1059         /* check if we already stored this frame */
1060         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1061                 dev_kfree_skb(skb);
1062                 goto out;
1063         }
1064
1065         /*
1066          * If the current MPDU is in the right order and nothing else
1067          * is stored we can process it directly, no need to buffer it.
1068          * If it is first but there's something stored, we may be able
1069          * to release frames after this one.
1070          */
1071         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1072             tid_agg_rx->stored_mpdu_num == 0) {
1073                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1074                         tid_agg_rx->head_seq_num =
1075                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1076                 ret = false;
1077                 goto out;
1078         }
1079
1080         /* put the frame in the reordering buffer */
1081         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1082         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1083                 tid_agg_rx->reorder_time[index] = jiffies;
1084                 tid_agg_rx->stored_mpdu_num++;
1085                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1086         }
1087
1088  out:
1089         spin_unlock(&tid_agg_rx->reorder_lock);
1090         return ret;
1091 }
1092
1093 /*
1094  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095  * true if the MPDU was buffered, false if it should be processed.
1096  */
1097 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1098                                        struct sk_buff_head *frames)
1099 {
1100         struct sk_buff *skb = rx->skb;
1101         struct ieee80211_local *local = rx->local;
1102         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1103         struct sta_info *sta = rx->sta;
1104         struct tid_ampdu_rx *tid_agg_rx;
1105         u16 sc;
1106         u8 tid, ack_policy;
1107
1108         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1109             is_multicast_ether_addr(hdr->addr1))
1110                 goto dont_reorder;
1111
1112         /*
1113          * filter the QoS data rx stream according to
1114          * STA/TID and check if this STA/TID is on aggregation
1115          */
1116
1117         if (!sta)
1118                 goto dont_reorder;
1119
1120         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1121                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1122         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1123
1124         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1125         if (!tid_agg_rx)
1126                 goto dont_reorder;
1127
1128         /* qos null data frames are excluded */
1129         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1130                 goto dont_reorder;
1131
1132         /* not part of a BA session */
1133         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1134             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1135                 goto dont_reorder;
1136
1137         /* new, potentially un-ordered, ampdu frame - process it */
1138
1139         /* reset session timer */
1140         if (tid_agg_rx->timeout)
1141                 tid_agg_rx->last_rx = jiffies;
1142
1143         /* if this mpdu is fragmented - terminate rx aggregation session */
1144         sc = le16_to_cpu(hdr->seq_ctrl);
1145         if (sc & IEEE80211_SCTL_FRAG) {
1146                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1147                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1148                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1149                 return;
1150         }
1151
1152         /*
1153          * No locking needed -- we will only ever process one
1154          * RX packet at a time, and thus own tid_agg_rx. All
1155          * other code manipulating it needs to (and does) make
1156          * sure that we cannot get to it any more before doing
1157          * anything with it.
1158          */
1159         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1160                                              frames))
1161                 return;
1162
1163  dont_reorder:
1164         __skb_queue_tail(frames, skb);
1165 }
1166
1167 static ieee80211_rx_result debug_noinline
1168 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1169 {
1170         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1171         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1172
1173         if (status->flag & RX_FLAG_DUP_VALIDATED)
1174                 return RX_CONTINUE;
1175
1176         /*
1177          * Drop duplicate 802.11 retransmissions
1178          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1179          */
1180
1181         if (rx->skb->len < 24)
1182                 return RX_CONTINUE;
1183
1184         if (ieee80211_is_ctl(hdr->frame_control) ||
1185             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1186             is_multicast_ether_addr(hdr->addr1))
1187                 return RX_CONTINUE;
1188
1189         if (!rx->sta)
1190                 return RX_CONTINUE;
1191
1192         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1193                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1194                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1195                 rx->sta->rx_stats.num_duplicates++;
1196                 return RX_DROP_UNUSABLE;
1197         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1198                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1199         }
1200
1201         return RX_CONTINUE;
1202 }
1203
1204 static ieee80211_rx_result debug_noinline
1205 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1206 {
1207         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1208
1209         /* Drop disallowed frame classes based on STA auth/assoc state;
1210          * IEEE 802.11, Chap 5.5.
1211          *
1212          * mac80211 filters only based on association state, i.e. it drops
1213          * Class 3 frames from not associated stations. hostapd sends
1214          * deauth/disassoc frames when needed. In addition, hostapd is
1215          * responsible for filtering on both auth and assoc states.
1216          */
1217
1218         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1219                 return ieee80211_rx_mesh_check(rx);
1220
1221         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1222                       ieee80211_is_pspoll(hdr->frame_control)) &&
1223                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1224                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1225                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1226                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1227                 /*
1228                  * accept port control frames from the AP even when it's not
1229                  * yet marked ASSOC to prevent a race where we don't set the
1230                  * assoc bit quickly enough before it sends the first frame
1231                  */
1232                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1233                     ieee80211_is_data_present(hdr->frame_control)) {
1234                         unsigned int hdrlen;
1235                         __be16 ethertype;
1236
1237                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1238
1239                         if (rx->skb->len < hdrlen + 8)
1240                                 return RX_DROP_MONITOR;
1241
1242                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1243                         if (ethertype == rx->sdata->control_port_protocol)
1244                                 return RX_CONTINUE;
1245                 }
1246
1247                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1248                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1249                                                hdr->addr2,
1250                                                GFP_ATOMIC))
1251                         return RX_DROP_UNUSABLE;
1252
1253                 return RX_DROP_MONITOR;
1254         }
1255
1256         return RX_CONTINUE;
1257 }
1258
1259
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1262 {
1263         struct ieee80211_local *local;
1264         struct ieee80211_hdr *hdr;
1265         struct sk_buff *skb;
1266
1267         local = rx->local;
1268         skb = rx->skb;
1269         hdr = (struct ieee80211_hdr *) skb->data;
1270
1271         if (!local->pspolling)
1272                 return RX_CONTINUE;
1273
1274         if (!ieee80211_has_fromds(hdr->frame_control))
1275                 /* this is not from AP */
1276                 return RX_CONTINUE;
1277
1278         if (!ieee80211_is_data(hdr->frame_control))
1279                 return RX_CONTINUE;
1280
1281         if (!ieee80211_has_moredata(hdr->frame_control)) {
1282                 /* AP has no more frames buffered for us */
1283                 local->pspolling = false;
1284                 return RX_CONTINUE;
1285         }
1286
1287         /* more data bit is set, let's request a new frame from the AP */
1288         ieee80211_send_pspoll(local, rx->sdata);
1289
1290         return RX_CONTINUE;
1291 }
1292
1293 static void sta_ps_start(struct sta_info *sta)
1294 {
1295         struct ieee80211_sub_if_data *sdata = sta->sdata;
1296         struct ieee80211_local *local = sdata->local;
1297         struct ps_data *ps;
1298         int tid;
1299
1300         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1301             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1302                 ps = &sdata->bss->ps;
1303         else
1304                 return;
1305
1306         atomic_inc(&ps->num_sta_ps);
1307         set_sta_flag(sta, WLAN_STA_PS_STA);
1308         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1309                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1310         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1311                sta->sta.addr, sta->sta.aid);
1312
1313         ieee80211_clear_fast_xmit(sta);
1314
1315         if (!sta->sta.txq[0])
1316                 return;
1317
1318         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1319                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1320
1321                 if (txqi->tin.backlog_packets)
1322                         set_bit(tid, &sta->txq_buffered_tids);
1323                 else
1324                         clear_bit(tid, &sta->txq_buffered_tids);
1325         }
1326 }
1327
1328 static void sta_ps_end(struct sta_info *sta)
1329 {
1330         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1331                sta->sta.addr, sta->sta.aid);
1332
1333         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1334                 /*
1335                  * Clear the flag only if the other one is still set
1336                  * so that the TX path won't start TX'ing new frames
1337                  * directly ... In the case that the driver flag isn't
1338                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1339                  */
1340                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1341                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1342                        sta->sta.addr, sta->sta.aid);
1343                 return;
1344         }
1345
1346         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1347         clear_sta_flag(sta, WLAN_STA_PS_STA);
1348         ieee80211_sta_ps_deliver_wakeup(sta);
1349 }
1350
1351 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1352 {
1353         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1354         bool in_ps;
1355
1356         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1357
1358         /* Don't let the same PS state be set twice */
1359         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1360         if ((start && in_ps) || (!start && !in_ps))
1361                 return -EINVAL;
1362
1363         if (start)
1364                 sta_ps_start(sta);
1365         else
1366                 sta_ps_end(sta);
1367
1368         return 0;
1369 }
1370 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1371
1372 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1373 {
1374         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1375
1376         if (test_sta_flag(sta, WLAN_STA_SP))
1377                 return;
1378
1379         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1380                 ieee80211_sta_ps_deliver_poll_response(sta);
1381         else
1382                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1383 }
1384 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1385
1386 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1387 {
1388         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1389         u8 ac = ieee802_1d_to_ac[tid & 7];
1390
1391         /*
1392          * If this AC is not trigger-enabled do nothing.
1393          *
1394          * NB: This could/should check a separate bitmap of trigger-
1395          * enabled queues, but for now we only implement uAPSD w/o
1396          * TSPEC changes to the ACs, so they're always the same.
1397          */
1398         if (!(sta->sta.uapsd_queues & BIT(ac)))
1399                 return;
1400
1401         /* if we are in a service period, do nothing */
1402         if (test_sta_flag(sta, WLAN_STA_SP))
1403                 return;
1404
1405         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1406                 ieee80211_sta_ps_deliver_uapsd(sta);
1407         else
1408                 set_sta_flag(sta, WLAN_STA_UAPSD);
1409 }
1410 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1411
1412 static ieee80211_rx_result debug_noinline
1413 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1414 {
1415         struct ieee80211_sub_if_data *sdata = rx->sdata;
1416         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1417         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1418
1419         if (!rx->sta)
1420                 return RX_CONTINUE;
1421
1422         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1423             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1424                 return RX_CONTINUE;
1425
1426         /*
1427          * The device handles station powersave, so don't do anything about
1428          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1429          * it to mac80211 since they're handled.)
1430          */
1431         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1432                 return RX_CONTINUE;
1433
1434         /*
1435          * Don't do anything if the station isn't already asleep. In
1436          * the uAPSD case, the station will probably be marked asleep,
1437          * in the PS-Poll case the station must be confused ...
1438          */
1439         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1440                 return RX_CONTINUE;
1441
1442         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1443                 ieee80211_sta_pspoll(&rx->sta->sta);
1444
1445                 /* Free PS Poll skb here instead of returning RX_DROP that would
1446                  * count as an dropped frame. */
1447                 dev_kfree_skb(rx->skb);
1448
1449                 return RX_QUEUED;
1450         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1451                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1452                    ieee80211_has_pm(hdr->frame_control) &&
1453                    (ieee80211_is_data_qos(hdr->frame_control) ||
1454                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1455                 u8 tid;
1456
1457                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1458
1459                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1460         }
1461
1462         return RX_CONTINUE;
1463 }
1464
1465 static ieee80211_rx_result debug_noinline
1466 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1467 {
1468         struct sta_info *sta = rx->sta;
1469         struct sk_buff *skb = rx->skb;
1470         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1471         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1472         int i;
1473
1474         if (!sta)
1475                 return RX_CONTINUE;
1476
1477         /*
1478          * Update last_rx only for IBSS packets which are for the current
1479          * BSSID and for station already AUTHORIZED to avoid keeping the
1480          * current IBSS network alive in cases where other STAs start
1481          * using different BSSID. This will also give the station another
1482          * chance to restart the authentication/authorization in case
1483          * something went wrong the first time.
1484          */
1485         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1486                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1487                                                 NL80211_IFTYPE_ADHOC);
1488                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1489                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1490                         sta->rx_stats.last_rx = jiffies;
1491                         if (ieee80211_is_data(hdr->frame_control) &&
1492                             !is_multicast_ether_addr(hdr->addr1))
1493                                 sta->rx_stats.last_rate =
1494                                         sta_stats_encode_rate(status);
1495                 }
1496         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1497                 sta->rx_stats.last_rx = jiffies;
1498         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1499                 /*
1500                  * Mesh beacons will update last_rx when if they are found to
1501                  * match the current local configuration when processed.
1502                  */
1503                 sta->rx_stats.last_rx = jiffies;
1504                 if (ieee80211_is_data(hdr->frame_control))
1505                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1506         }
1507
1508         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1509                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1510
1511         sta->rx_stats.fragments++;
1512
1513         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1514         sta->rx_stats.bytes += rx->skb->len;
1515         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1516
1517         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1518                 sta->rx_stats.last_signal = status->signal;
1519                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1520         }
1521
1522         if (status->chains) {
1523                 sta->rx_stats.chains = status->chains;
1524                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1525                         int signal = status->chain_signal[i];
1526
1527                         if (!(status->chains & BIT(i)))
1528                                 continue;
1529
1530                         sta->rx_stats.chain_signal_last[i] = signal;
1531                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1532                                         -signal);
1533                 }
1534         }
1535
1536         /*
1537          * Change STA power saving mode only at the end of a frame
1538          * exchange sequence.
1539          */
1540         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1541             !ieee80211_has_morefrags(hdr->frame_control) &&
1542             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1543             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1544              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1545             /* PM bit is only checked in frames where it isn't reserved,
1546              * in AP mode it's reserved in non-bufferable management frames
1547              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1548              */
1549             (!ieee80211_is_mgmt(hdr->frame_control) ||
1550              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1551                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1552                         if (!ieee80211_has_pm(hdr->frame_control))
1553                                 sta_ps_end(sta);
1554                 } else {
1555                         if (ieee80211_has_pm(hdr->frame_control))
1556                                 sta_ps_start(sta);
1557                 }
1558         }
1559
1560         /* mesh power save support */
1561         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1562                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1563
1564         /*
1565          * Drop (qos-)data::nullfunc frames silently, since they
1566          * are used only to control station power saving mode.
1567          */
1568         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1569             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1570                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1571
1572                 /*
1573                  * If we receive a 4-addr nullfunc frame from a STA
1574                  * that was not moved to a 4-addr STA vlan yet send
1575                  * the event to userspace and for older hostapd drop
1576                  * the frame to the monitor interface.
1577                  */
1578                 if (ieee80211_has_a4(hdr->frame_control) &&
1579                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1580                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1581                       !rx->sdata->u.vlan.sta))) {
1582                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1583                                 cfg80211_rx_unexpected_4addr_frame(
1584                                         rx->sdata->dev, sta->sta.addr,
1585                                         GFP_ATOMIC);
1586                         return RX_DROP_MONITOR;
1587                 }
1588                 /*
1589                  * Update counter and free packet here to avoid
1590                  * counting this as a dropped packed.
1591                  */
1592                 sta->rx_stats.packets++;
1593                 dev_kfree_skb(rx->skb);
1594                 return RX_QUEUED;
1595         }
1596
1597         return RX_CONTINUE;
1598 } /* ieee80211_rx_h_sta_process */
1599
1600 static ieee80211_rx_result debug_noinline
1601 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1602 {
1603         struct sk_buff *skb = rx->skb;
1604         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1605         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1606         int keyidx;
1607         int hdrlen;
1608         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1609         struct ieee80211_key *sta_ptk = NULL;
1610         int mmie_keyidx = -1;
1611         __le16 fc;
1612         const struct ieee80211_cipher_scheme *cs = NULL;
1613
1614         /*
1615          * Key selection 101
1616          *
1617          * There are four types of keys:
1618          *  - GTK (group keys)
1619          *  - IGTK (group keys for management frames)
1620          *  - PTK (pairwise keys)
1621          *  - STK (station-to-station pairwise keys)
1622          *
1623          * When selecting a key, we have to distinguish between multicast
1624          * (including broadcast) and unicast frames, the latter can only
1625          * use PTKs and STKs while the former always use GTKs and IGTKs.
1626          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1627          * unicast frames can also use key indices like GTKs. Hence, if we
1628          * don't have a PTK/STK we check the key index for a WEP key.
1629          *
1630          * Note that in a regular BSS, multicast frames are sent by the
1631          * AP only, associated stations unicast the frame to the AP first
1632          * which then multicasts it on their behalf.
1633          *
1634          * There is also a slight problem in IBSS mode: GTKs are negotiated
1635          * with each station, that is something we don't currently handle.
1636          * The spec seems to expect that one negotiates the same key with
1637          * every station but there's no such requirement; VLANs could be
1638          * possible.
1639          */
1640
1641         /* start without a key */
1642         rx->key = NULL;
1643         fc = hdr->frame_control;
1644
1645         if (rx->sta) {
1646                 int keyid = rx->sta->ptk_idx;
1647
1648                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1649                         cs = rx->sta->cipher_scheme;
1650                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1651                         if (unlikely(keyid < 0))
1652                                 return RX_DROP_UNUSABLE;
1653                 }
1654                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1655         }
1656
1657         if (!ieee80211_has_protected(fc))
1658                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1659
1660         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1661                 rx->key = sta_ptk;
1662                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1663                     (status->flag & RX_FLAG_IV_STRIPPED))
1664                         return RX_CONTINUE;
1665                 /* Skip decryption if the frame is not protected. */
1666                 if (!ieee80211_has_protected(fc))
1667                         return RX_CONTINUE;
1668         } else if (mmie_keyidx >= 0) {
1669                 /* Broadcast/multicast robust management frame / BIP */
1670                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1671                     (status->flag & RX_FLAG_IV_STRIPPED))
1672                         return RX_CONTINUE;
1673
1674                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1675                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1676                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1677                 if (rx->sta) {
1678                         if (ieee80211_is_group_privacy_action(skb) &&
1679                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1680                                 return RX_DROP_MONITOR;
1681
1682                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1683                 }
1684                 if (!rx->key)
1685                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1686         } else if (!ieee80211_has_protected(fc)) {
1687                 /*
1688                  * The frame was not protected, so skip decryption. However, we
1689                  * need to set rx->key if there is a key that could have been
1690                  * used so that the frame may be dropped if encryption would
1691                  * have been expected.
1692                  */
1693                 struct ieee80211_key *key = NULL;
1694                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1695                 int i;
1696
1697                 if (ieee80211_is_mgmt(fc) &&
1698                     is_multicast_ether_addr(hdr->addr1) &&
1699                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1700                         rx->key = key;
1701                 else {
1702                         if (rx->sta) {
1703                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1704                                         key = rcu_dereference(rx->sta->gtk[i]);
1705                                         if (key)
1706                                                 break;
1707                                 }
1708                         }
1709                         if (!key) {
1710                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1711                                         key = rcu_dereference(sdata->keys[i]);
1712                                         if (key)
1713                                                 break;
1714                                 }
1715                         }
1716                         if (key)
1717                                 rx->key = key;
1718                 }
1719                 return RX_CONTINUE;
1720         } else {
1721                 u8 keyid;
1722
1723                 /*
1724                  * The device doesn't give us the IV so we won't be
1725                  * able to look up the key. That's ok though, we
1726                  * don't need to decrypt the frame, we just won't
1727                  * be able to keep statistics accurate.
1728                  * Except for key threshold notifications, should
1729                  * we somehow allow the driver to tell us which key
1730                  * the hardware used if this flag is set?
1731                  */
1732                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1733                     (status->flag & RX_FLAG_IV_STRIPPED))
1734                         return RX_CONTINUE;
1735
1736                 hdrlen = ieee80211_hdrlen(fc);
1737
1738                 if (cs) {
1739                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1740
1741                         if (unlikely(keyidx < 0))
1742                                 return RX_DROP_UNUSABLE;
1743                 } else {
1744                         if (rx->skb->len < 8 + hdrlen)
1745                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1746                         /*
1747                          * no need to call ieee80211_wep_get_keyidx,
1748                          * it verifies a bunch of things we've done already
1749                          */
1750                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1751                         keyidx = keyid >> 6;
1752                 }
1753
1754                 /* check per-station GTK first, if multicast packet */
1755                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1756                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1757
1758                 /* if not found, try default key */
1759                 if (!rx->key) {
1760                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1761
1762                         /*
1763                          * RSNA-protected unicast frames should always be
1764                          * sent with pairwise or station-to-station keys,
1765                          * but for WEP we allow using a key index as well.
1766                          */
1767                         if (rx->key &&
1768                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1769                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1770                             !is_multicast_ether_addr(hdr->addr1))
1771                                 rx->key = NULL;
1772                 }
1773         }
1774
1775         if (rx->key) {
1776                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1777                         return RX_DROP_MONITOR;
1778
1779                 /* TODO: add threshold stuff again */
1780         } else {
1781                 return RX_DROP_MONITOR;
1782         }
1783
1784         switch (rx->key->conf.cipher) {
1785         case WLAN_CIPHER_SUITE_WEP40:
1786         case WLAN_CIPHER_SUITE_WEP104:
1787                 result = ieee80211_crypto_wep_decrypt(rx);
1788                 break;
1789         case WLAN_CIPHER_SUITE_TKIP:
1790                 result = ieee80211_crypto_tkip_decrypt(rx);
1791                 break;
1792         case WLAN_CIPHER_SUITE_CCMP:
1793                 result = ieee80211_crypto_ccmp_decrypt(
1794                         rx, IEEE80211_CCMP_MIC_LEN);
1795                 break;
1796         case WLAN_CIPHER_SUITE_CCMP_256:
1797                 result = ieee80211_crypto_ccmp_decrypt(
1798                         rx, IEEE80211_CCMP_256_MIC_LEN);
1799                 break;
1800         case WLAN_CIPHER_SUITE_AES_CMAC:
1801                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1802                 break;
1803         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1804                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1805                 break;
1806         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1807         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1808                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1809                 break;
1810         case WLAN_CIPHER_SUITE_GCMP:
1811         case WLAN_CIPHER_SUITE_GCMP_256:
1812                 result = ieee80211_crypto_gcmp_decrypt(rx);
1813                 break;
1814         default:
1815                 result = ieee80211_crypto_hw_decrypt(rx);
1816         }
1817
1818         /* the hdr variable is invalid after the decrypt handlers */
1819
1820         /* either the frame has been decrypted or will be dropped */
1821         status->flag |= RX_FLAG_DECRYPTED;
1822
1823         return result;
1824 }
1825
1826 static inline struct ieee80211_fragment_entry *
1827 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1828                          unsigned int frag, unsigned int seq, int rx_queue,
1829                          struct sk_buff **skb)
1830 {
1831         struct ieee80211_fragment_entry *entry;
1832
1833         entry = &sdata->fragments[sdata->fragment_next++];
1834         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1835                 sdata->fragment_next = 0;
1836
1837         if (!skb_queue_empty(&entry->skb_list))
1838                 __skb_queue_purge(&entry->skb_list);
1839
1840         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1841         *skb = NULL;
1842         entry->first_frag_time = jiffies;
1843         entry->seq = seq;
1844         entry->rx_queue = rx_queue;
1845         entry->last_frag = frag;
1846         entry->check_sequential_pn = false;
1847         entry->extra_len = 0;
1848
1849         return entry;
1850 }
1851
1852 static inline struct ieee80211_fragment_entry *
1853 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1854                           unsigned int frag, unsigned int seq,
1855                           int rx_queue, struct ieee80211_hdr *hdr)
1856 {
1857         struct ieee80211_fragment_entry *entry;
1858         int i, idx;
1859
1860         idx = sdata->fragment_next;
1861         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1862                 struct ieee80211_hdr *f_hdr;
1863
1864                 idx--;
1865                 if (idx < 0)
1866                         idx = IEEE80211_FRAGMENT_MAX - 1;
1867
1868                 entry = &sdata->fragments[idx];
1869                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1870                     entry->rx_queue != rx_queue ||
1871                     entry->last_frag + 1 != frag)
1872                         continue;
1873
1874                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1875
1876                 /*
1877                  * Check ftype and addresses are equal, else check next fragment
1878                  */
1879                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1880                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1881                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1882                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1883                         continue;
1884
1885                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1886                         __skb_queue_purge(&entry->skb_list);
1887                         continue;
1888                 }
1889                 return entry;
1890         }
1891
1892         return NULL;
1893 }
1894
1895 static ieee80211_rx_result debug_noinline
1896 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1897 {
1898         struct ieee80211_hdr *hdr;
1899         u16 sc;
1900         __le16 fc;
1901         unsigned int frag, seq;
1902         struct ieee80211_fragment_entry *entry;
1903         struct sk_buff *skb;
1904         struct ieee80211_rx_status *status;
1905
1906         hdr = (struct ieee80211_hdr *)rx->skb->data;
1907         fc = hdr->frame_control;
1908
1909         if (ieee80211_is_ctl(fc))
1910                 return RX_CONTINUE;
1911
1912         sc = le16_to_cpu(hdr->seq_ctrl);
1913         frag = sc & IEEE80211_SCTL_FRAG;
1914
1915         if (is_multicast_ether_addr(hdr->addr1)) {
1916                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1917                 goto out_no_led;
1918         }
1919
1920         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1921                 goto out;
1922
1923         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1924
1925         if (skb_linearize(rx->skb))
1926                 return RX_DROP_UNUSABLE;
1927
1928         /*
1929          *  skb_linearize() might change the skb->data and
1930          *  previously cached variables (in this case, hdr) need to
1931          *  be refreshed with the new data.
1932          */
1933         hdr = (struct ieee80211_hdr *)rx->skb->data;
1934         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1935
1936         if (frag == 0) {
1937                 /* This is the first fragment of a new frame. */
1938                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1939                                                  rx->seqno_idx, &(rx->skb));
1940                 if (rx->key &&
1941                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1942                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1943                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1944                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1945                     ieee80211_has_protected(fc)) {
1946                         int queue = rx->security_idx;
1947
1948                         /* Store CCMP/GCMP PN so that we can verify that the
1949                          * next fragment has a sequential PN value.
1950                          */
1951                         entry->check_sequential_pn = true;
1952                         memcpy(entry->last_pn,
1953                                rx->key->u.ccmp.rx_pn[queue],
1954                                IEEE80211_CCMP_PN_LEN);
1955                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1956                                               u.ccmp.rx_pn) !=
1957                                      offsetof(struct ieee80211_key,
1958                                               u.gcmp.rx_pn));
1959                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1960                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1961                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1962                                      IEEE80211_GCMP_PN_LEN);
1963                 }
1964                 return RX_QUEUED;
1965         }
1966
1967         /* This is a fragment for a frame that should already be pending in
1968          * fragment cache. Add this fragment to the end of the pending entry.
1969          */
1970         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1971                                           rx->seqno_idx, hdr);
1972         if (!entry) {
1973                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1974                 return RX_DROP_MONITOR;
1975         }
1976
1977         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1978          *  MPDU PN values are not incrementing in steps of 1."
1979          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1980          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1981          */
1982         if (entry->check_sequential_pn) {
1983                 int i;
1984                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1985                 int queue;
1986
1987                 if (!rx->key ||
1988                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1989                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1990                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1991                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1992                         return RX_DROP_UNUSABLE;
1993                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1994                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1995                         pn[i]++;
1996                         if (pn[i])
1997                                 break;
1998                 }
1999                 queue = rx->security_idx;
2000                 rpn = rx->key->u.ccmp.rx_pn[queue];
2001                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2002                         return RX_DROP_UNUSABLE;
2003                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2004         }
2005
2006         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2007         __skb_queue_tail(&entry->skb_list, rx->skb);
2008         entry->last_frag = frag;
2009         entry->extra_len += rx->skb->len;
2010         if (ieee80211_has_morefrags(fc)) {
2011                 rx->skb = NULL;
2012                 return RX_QUEUED;
2013         }
2014
2015         rx->skb = __skb_dequeue(&entry->skb_list);
2016         if (skb_tailroom(rx->skb) < entry->extra_len) {
2017                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2018                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2019                                               GFP_ATOMIC))) {
2020                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2021                         __skb_queue_purge(&entry->skb_list);
2022                         return RX_DROP_UNUSABLE;
2023                 }
2024         }
2025         while ((skb = __skb_dequeue(&entry->skb_list))) {
2026                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2027                 dev_kfree_skb(skb);
2028         }
2029
2030         /* Complete frame has been reassembled - process it now */
2031         status = IEEE80211_SKB_RXCB(rx->skb);
2032
2033  out:
2034         ieee80211_led_rx(rx->local);
2035  out_no_led:
2036         if (rx->sta)
2037                 rx->sta->rx_stats.packets++;
2038         return RX_CONTINUE;
2039 }
2040
2041 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2042 {
2043         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2044                 return -EACCES;
2045
2046         return 0;
2047 }
2048
2049 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2050 {
2051         struct sk_buff *skb = rx->skb;
2052         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2053
2054         /*
2055          * Pass through unencrypted frames if the hardware has
2056          * decrypted them already.
2057          */
2058         if (status->flag & RX_FLAG_DECRYPTED)
2059                 return 0;
2060
2061         /* Drop unencrypted frames if key is set. */
2062         if (unlikely(!ieee80211_has_protected(fc) &&
2063                      !ieee80211_is_nullfunc(fc) &&
2064                      ieee80211_is_data(fc) && rx->key))
2065                 return -EACCES;
2066
2067         return 0;
2068 }
2069
2070 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2071 {
2072         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2073         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2074         __le16 fc = hdr->frame_control;
2075
2076         /*
2077          * Pass through unencrypted frames if the hardware has
2078          * decrypted them already.
2079          */
2080         if (status->flag & RX_FLAG_DECRYPTED)
2081                 return 0;
2082
2083         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2084                 if (unlikely(!ieee80211_has_protected(fc) &&
2085                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2086                              rx->key)) {
2087                         if (ieee80211_is_deauth(fc) ||
2088                             ieee80211_is_disassoc(fc))
2089                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2090                                                              rx->skb->data,
2091                                                              rx->skb->len);
2092                         return -EACCES;
2093                 }
2094                 /* BIP does not use Protected field, so need to check MMIE */
2095                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2096                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2097                         if (ieee80211_is_deauth(fc) ||
2098                             ieee80211_is_disassoc(fc))
2099                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2100                                                              rx->skb->data,
2101                                                              rx->skb->len);
2102                         return -EACCES;
2103                 }
2104                 /*
2105                  * When using MFP, Action frames are not allowed prior to
2106                  * having configured keys.
2107                  */
2108                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2109                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2110                         return -EACCES;
2111         }
2112
2113         return 0;
2114 }
2115
2116 static int
2117 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2118 {
2119         struct ieee80211_sub_if_data *sdata = rx->sdata;
2120         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2121         bool check_port_control = false;
2122         struct ethhdr *ehdr;
2123         int ret;
2124
2125         *port_control = false;
2126         if (ieee80211_has_a4(hdr->frame_control) &&
2127             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2128                 return -1;
2129
2130         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2131             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2132
2133                 if (!sdata->u.mgd.use_4addr)
2134                         return -1;
2135                 else
2136                         check_port_control = true;
2137         }
2138
2139         if (is_multicast_ether_addr(hdr->addr1) &&
2140             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2141                 return -1;
2142
2143         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2144         if (ret < 0)
2145                 return ret;
2146
2147         ehdr = (struct ethhdr *) rx->skb->data;
2148         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2149                 *port_control = true;
2150         else if (check_port_control)
2151                 return -1;
2152
2153         return 0;
2154 }
2155
2156 /*
2157  * requires that rx->skb is a frame with ethernet header
2158  */
2159 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2160 {
2161         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2162                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2163         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2164
2165         /*
2166          * Allow EAPOL frames to us/the PAE group address regardless
2167          * of whether the frame was encrypted or not.
2168          */
2169         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2170             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2171              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2172                 return true;
2173
2174         if (ieee80211_802_1x_port_control(rx) ||
2175             ieee80211_drop_unencrypted(rx, fc))
2176                 return false;
2177
2178         return true;
2179 }
2180
2181 /*
2182  * requires that rx->skb is a frame with ethernet header
2183  */
2184 static void
2185 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2186 {
2187         struct ieee80211_sub_if_data *sdata = rx->sdata;
2188         struct net_device *dev = sdata->dev;
2189         struct sk_buff *skb, *xmit_skb;
2190         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2191         struct sta_info *dsta;
2192
2193         skb = rx->skb;
2194         xmit_skb = NULL;
2195
2196         ieee80211_rx_stats(dev, skb->len);
2197
2198         if (rx->sta) {
2199                 /* The seqno index has the same property as needed
2200                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2201                  * for non-QoS-data frames. Here we know it's a data
2202                  * frame, so count MSDUs.
2203                  */
2204                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2205                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2206                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2207         }
2208
2209         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2210              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2211             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2212             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2213                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2214                         /*
2215                          * send multicast frames both to higher layers in
2216                          * local net stack and back to the wireless medium
2217                          */
2218                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2219                         if (!xmit_skb)
2220                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2221                                                     dev->name);
2222                 } else {
2223                         dsta = sta_info_get(sdata, skb->data);
2224                         if (dsta) {
2225                                 /*
2226                                  * The destination station is associated to
2227                                  * this AP (in this VLAN), so send the frame
2228                                  * directly to it and do not pass it to local
2229                                  * net stack.
2230                                  */
2231                                 xmit_skb = skb;
2232                                 skb = NULL;
2233                         }
2234                 }
2235         }
2236
2237 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2238         if (skb) {
2239                 /* 'align' will only take the values 0 or 2 here since all
2240                  * frames are required to be aligned to 2-byte boundaries
2241                  * when being passed to mac80211; the code here works just
2242                  * as well if that isn't true, but mac80211 assumes it can
2243                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2244                  */
2245                 int align;
2246
2247                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2248                 if (align) {
2249                         if (WARN_ON(skb_headroom(skb) < 3)) {
2250                                 dev_kfree_skb(skb);
2251                                 skb = NULL;
2252                         } else {
2253                                 u8 *data = skb->data;
2254                                 size_t len = skb_headlen(skb);
2255                                 skb->data -= align;
2256                                 memmove(skb->data, data, len);
2257                                 skb_set_tail_pointer(skb, len);
2258                         }
2259                 }
2260         }
2261 #endif
2262
2263         if (skb) {
2264                 /* deliver to local stack */
2265                 skb->protocol = eth_type_trans(skb, dev);
2266                 memset(skb->cb, 0, sizeof(skb->cb));
2267                 if (rx->napi)
2268                         napi_gro_receive(rx->napi, skb);
2269                 else
2270                         netif_receive_skb(skb);
2271         }
2272
2273         if (xmit_skb) {
2274                 /*
2275                  * Send to wireless media and increase priority by 256 to
2276                  * keep the received priority instead of reclassifying
2277                  * the frame (see cfg80211_classify8021d).
2278                  */
2279                 xmit_skb->priority += 256;
2280                 xmit_skb->protocol = htons(ETH_P_802_3);
2281                 skb_reset_network_header(xmit_skb);
2282                 skb_reset_mac_header(xmit_skb);
2283                 dev_queue_xmit(xmit_skb);
2284         }
2285 }
2286
2287 static ieee80211_rx_result debug_noinline
2288 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2289 {
2290         struct net_device *dev = rx->sdata->dev;
2291         struct sk_buff *skb = rx->skb;
2292         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2293         __le16 fc = hdr->frame_control;
2294         struct sk_buff_head frame_list;
2295         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2296
2297         if (unlikely(!ieee80211_is_data(fc)))
2298                 return RX_CONTINUE;
2299
2300         if (unlikely(!ieee80211_is_data_present(fc)))
2301                 return RX_DROP_MONITOR;
2302
2303         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2304                 return RX_CONTINUE;
2305
2306         if (ieee80211_has_a4(hdr->frame_control) &&
2307             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2308             !rx->sdata->u.vlan.sta)
2309                 return RX_DROP_UNUSABLE;
2310
2311         if (is_multicast_ether_addr(hdr->addr1) &&
2312             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2313               rx->sdata->u.vlan.sta) ||
2314              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2315               rx->sdata->u.mgd.use_4addr)))
2316                 return RX_DROP_UNUSABLE;
2317
2318         skb->dev = dev;
2319         __skb_queue_head_init(&frame_list);
2320
2321         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2322                                  rx->sdata->vif.type,
2323                                  rx->local->hw.extra_tx_headroom, true);
2324
2325         while (!skb_queue_empty(&frame_list)) {
2326                 rx->skb = __skb_dequeue(&frame_list);
2327
2328                 if (!ieee80211_frame_allowed(rx, fc)) {
2329                         dev_kfree_skb(rx->skb);
2330                         continue;
2331                 }
2332
2333                 ieee80211_deliver_skb(rx);
2334         }
2335
2336         return RX_QUEUED;
2337 }
2338
2339 #ifdef CONFIG_MAC80211_MESH
2340 static ieee80211_rx_result
2341 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2342 {
2343         struct ieee80211_hdr *fwd_hdr, *hdr;
2344         struct ieee80211_tx_info *info;
2345         struct ieee80211s_hdr *mesh_hdr;
2346         struct sk_buff *skb = rx->skb, *fwd_skb;
2347         struct ieee80211_local *local = rx->local;
2348         struct ieee80211_sub_if_data *sdata = rx->sdata;
2349         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2350         u16 ac, q, hdrlen;
2351
2352         hdr = (struct ieee80211_hdr *) skb->data;
2353         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2354
2355         /* make sure fixed part of mesh header is there, also checks skb len */
2356         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2357                 return RX_DROP_MONITOR;
2358
2359         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2360
2361         /* make sure full mesh header is there, also checks skb len */
2362         if (!pskb_may_pull(rx->skb,
2363                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2364                 return RX_DROP_MONITOR;
2365
2366         /* reload pointers */
2367         hdr = (struct ieee80211_hdr *) skb->data;
2368         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2369
2370         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2371                 return RX_DROP_MONITOR;
2372
2373         /* frame is in RMC, don't forward */
2374         if (ieee80211_is_data(hdr->frame_control) &&
2375             is_multicast_ether_addr(hdr->addr1) &&
2376             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2377                 return RX_DROP_MONITOR;
2378
2379         if (!ieee80211_is_data(hdr->frame_control))
2380                 return RX_CONTINUE;
2381
2382         if (!mesh_hdr->ttl)
2383                 return RX_DROP_MONITOR;
2384
2385         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2386                 struct mesh_path *mppath;
2387                 char *proxied_addr;
2388                 char *mpp_addr;
2389
2390                 if (is_multicast_ether_addr(hdr->addr1)) {
2391                         mpp_addr = hdr->addr3;
2392                         proxied_addr = mesh_hdr->eaddr1;
2393                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2394                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2395                         mpp_addr = hdr->addr4;
2396                         proxied_addr = mesh_hdr->eaddr2;
2397                 } else {
2398                         return RX_DROP_MONITOR;
2399                 }
2400
2401                 rcu_read_lock();
2402                 mppath = mpp_path_lookup(sdata, proxied_addr);
2403                 if (!mppath) {
2404                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2405                 } else {
2406                         spin_lock_bh(&mppath->state_lock);
2407                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2408                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2409                         mppath->exp_time = jiffies;
2410                         spin_unlock_bh(&mppath->state_lock);
2411                 }
2412                 rcu_read_unlock();
2413         }
2414
2415         /* Frame has reached destination.  Don't forward */
2416         if (!is_multicast_ether_addr(hdr->addr1) &&
2417             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2418                 return RX_CONTINUE;
2419
2420         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2421         q = sdata->vif.hw_queue[ac];
2422         if (ieee80211_queue_stopped(&local->hw, q)) {
2423                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2424                 return RX_DROP_MONITOR;
2425         }
2426         skb_set_queue_mapping(skb, q);
2427
2428         if (!--mesh_hdr->ttl) {
2429                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2430                 goto out;
2431         }
2432
2433         if (!ifmsh->mshcfg.dot11MeshForwarding)
2434                 goto out;
2435
2436         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2437         if (!fwd_skb) {
2438                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2439                                     sdata->name);
2440                 goto out;
2441         }
2442
2443         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2444         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2445         info = IEEE80211_SKB_CB(fwd_skb);
2446         memset(info, 0, sizeof(*info));
2447         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2448         info->control.vif = &rx->sdata->vif;
2449         info->control.jiffies = jiffies;
2450         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2451                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2452                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2453                 /* update power mode indication when forwarding */
2454                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2455         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2456                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2457                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2458         } else {
2459                 /* unable to resolve next hop */
2460                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2461                                    fwd_hdr->addr3, 0,
2462                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2463                                    fwd_hdr->addr2);
2464                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2465                 kfree_skb(fwd_skb);
2466                 return RX_DROP_MONITOR;
2467         }
2468
2469         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2470         ieee80211_add_pending_skb(local, fwd_skb);
2471  out:
2472         if (is_multicast_ether_addr(hdr->addr1))
2473                 return RX_CONTINUE;
2474         return RX_DROP_MONITOR;
2475 }
2476 #endif
2477
2478 static ieee80211_rx_result debug_noinline
2479 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2480 {
2481         struct ieee80211_sub_if_data *sdata = rx->sdata;
2482         struct ieee80211_local *local = rx->local;
2483         struct net_device *dev = sdata->dev;
2484         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2485         __le16 fc = hdr->frame_control;
2486         bool port_control;
2487         int err;
2488
2489         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2490                 return RX_CONTINUE;
2491
2492         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2493                 return RX_DROP_MONITOR;
2494
2495         /*
2496          * Send unexpected-4addr-frame event to hostapd. For older versions,
2497          * also drop the frame to cooked monitor interfaces.
2498          */
2499         if (ieee80211_has_a4(hdr->frame_control) &&
2500             sdata->vif.type == NL80211_IFTYPE_AP) {
2501                 if (rx->sta &&
2502                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2503                         cfg80211_rx_unexpected_4addr_frame(
2504                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2505                 return RX_DROP_MONITOR;
2506         }
2507
2508         err = __ieee80211_data_to_8023(rx, &port_control);
2509         if (unlikely(err))
2510                 return RX_DROP_UNUSABLE;
2511
2512         if (!ieee80211_frame_allowed(rx, fc))
2513                 return RX_DROP_MONITOR;
2514
2515         /* directly handle TDLS channel switch requests/responses */
2516         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2517                                                 cpu_to_be16(ETH_P_TDLS))) {
2518                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2519
2520                 if (pskb_may_pull(rx->skb,
2521                                   offsetof(struct ieee80211_tdls_data, u)) &&
2522                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2523                     tf->category == WLAN_CATEGORY_TDLS &&
2524                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2525                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2526                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2527                         schedule_work(&local->tdls_chsw_work);
2528                         if (rx->sta)
2529                                 rx->sta->rx_stats.packets++;
2530
2531                         return RX_QUEUED;
2532                 }
2533         }
2534
2535         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2536             unlikely(port_control) && sdata->bss) {
2537                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2538                                      u.ap);
2539                 dev = sdata->dev;
2540                 rx->sdata = sdata;
2541         }
2542
2543         rx->skb->dev = dev;
2544
2545         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2546             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2547             !is_multicast_ether_addr(
2548                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2549             (!local->scanning &&
2550              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2551                 mod_timer(&local->dynamic_ps_timer, jiffies +
2552                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2553
2554         ieee80211_deliver_skb(rx);
2555
2556         return RX_QUEUED;
2557 }
2558
2559 static ieee80211_rx_result debug_noinline
2560 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2561 {
2562         struct sk_buff *skb = rx->skb;
2563         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2564         struct tid_ampdu_rx *tid_agg_rx;
2565         u16 start_seq_num;
2566         u16 tid;
2567
2568         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2569                 return RX_CONTINUE;
2570
2571         if (ieee80211_is_back_req(bar->frame_control)) {
2572                 struct {
2573                         __le16 control, start_seq_num;
2574                 } __packed bar_data;
2575                 struct ieee80211_event event = {
2576                         .type = BAR_RX_EVENT,
2577                 };
2578
2579                 if (!rx->sta)
2580                         return RX_DROP_MONITOR;
2581
2582                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2583                                   &bar_data, sizeof(bar_data)))
2584                         return RX_DROP_MONITOR;
2585
2586                 tid = le16_to_cpu(bar_data.control) >> 12;
2587
2588                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2589                 if (!tid_agg_rx)
2590                         return RX_DROP_MONITOR;
2591
2592                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2593                 event.u.ba.tid = tid;
2594                 event.u.ba.ssn = start_seq_num;
2595                 event.u.ba.sta = &rx->sta->sta;
2596
2597                 /* reset session timer */
2598                 if (tid_agg_rx->timeout)
2599                         mod_timer(&tid_agg_rx->session_timer,
2600                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2601
2602                 spin_lock(&tid_agg_rx->reorder_lock);
2603                 /* release stored frames up to start of BAR */
2604                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2605                                                  start_seq_num, frames);
2606                 spin_unlock(&tid_agg_rx->reorder_lock);
2607
2608                 drv_event_callback(rx->local, rx->sdata, &event);
2609
2610                 kfree_skb(skb);
2611                 return RX_QUEUED;
2612         }
2613
2614         /*
2615          * After this point, we only want management frames,
2616          * so we can drop all remaining control frames to
2617          * cooked monitor interfaces.
2618          */
2619         return RX_DROP_MONITOR;
2620 }
2621
2622 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2623                                            struct ieee80211_mgmt *mgmt,
2624                                            size_t len)
2625 {
2626         struct ieee80211_local *local = sdata->local;
2627         struct sk_buff *skb;
2628         struct ieee80211_mgmt *resp;
2629
2630         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2631                 /* Not to own unicast address */
2632                 return;
2633         }
2634
2635         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2636             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2637                 /* Not from the current AP or not associated yet. */
2638                 return;
2639         }
2640
2641         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2642                 /* Too short SA Query request frame */
2643                 return;
2644         }
2645
2646         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2647         if (skb == NULL)
2648                 return;
2649
2650         skb_reserve(skb, local->hw.extra_tx_headroom);
2651         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2652         memset(resp, 0, 24);
2653         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2654         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2655         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2656         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2657                                           IEEE80211_STYPE_ACTION);
2658         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2659         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2660         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2661         memcpy(resp->u.action.u.sa_query.trans_id,
2662                mgmt->u.action.u.sa_query.trans_id,
2663                WLAN_SA_QUERY_TR_ID_LEN);
2664
2665         ieee80211_tx_skb(sdata, skb);
2666 }
2667
2668 static ieee80211_rx_result debug_noinline
2669 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2670 {
2671         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2672         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2673
2674         /*
2675          * From here on, look only at management frames.
2676          * Data and control frames are already handled,
2677          * and unknown (reserved) frames are useless.
2678          */
2679         if (rx->skb->len < 24)
2680                 return RX_DROP_MONITOR;
2681
2682         if (!ieee80211_is_mgmt(mgmt->frame_control))
2683                 return RX_DROP_MONITOR;
2684
2685         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2686             ieee80211_is_beacon(mgmt->frame_control) &&
2687             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2688                 int sig = 0;
2689
2690                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2691                         sig = status->signal;
2692
2693                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2694                                             rx->skb->data, rx->skb->len,
2695                                             status->freq, sig);
2696                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2697         }
2698
2699         if (ieee80211_drop_unencrypted_mgmt(rx))
2700                 return RX_DROP_UNUSABLE;
2701
2702         return RX_CONTINUE;
2703 }
2704
2705 static ieee80211_rx_result debug_noinline
2706 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2707 {
2708         struct ieee80211_local *local = rx->local;
2709         struct ieee80211_sub_if_data *sdata = rx->sdata;
2710         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2711         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2712         int len = rx->skb->len;
2713
2714         if (!ieee80211_is_action(mgmt->frame_control))
2715                 return RX_CONTINUE;
2716
2717         /* drop too small frames */
2718         if (len < IEEE80211_MIN_ACTION_SIZE)
2719                 return RX_DROP_UNUSABLE;
2720
2721         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2722             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2723             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2724                 return RX_DROP_UNUSABLE;
2725
2726         switch (mgmt->u.action.category) {
2727         case WLAN_CATEGORY_HT:
2728                 /* reject HT action frames from stations not supporting HT */
2729                 if (!rx->sta->sta.ht_cap.ht_supported)
2730                         goto invalid;
2731
2732                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2733                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2734                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2735                     sdata->vif.type != NL80211_IFTYPE_AP &&
2736                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2737                         break;
2738
2739                 /* verify action & smps_control/chanwidth are present */
2740                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2741                         goto invalid;
2742
2743                 switch (mgmt->u.action.u.ht_smps.action) {
2744                 case WLAN_HT_ACTION_SMPS: {
2745                         struct ieee80211_supported_band *sband;
2746                         enum ieee80211_smps_mode smps_mode;
2747
2748                         /* convert to HT capability */
2749                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2750                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2751                                 smps_mode = IEEE80211_SMPS_OFF;
2752                                 break;
2753                         case WLAN_HT_SMPS_CONTROL_STATIC:
2754                                 smps_mode = IEEE80211_SMPS_STATIC;
2755                                 break;
2756                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2757                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2758                                 break;
2759                         default:
2760                                 goto invalid;
2761                         }
2762
2763                         /* if no change do nothing */
2764                         if (rx->sta->sta.smps_mode == smps_mode)
2765                                 goto handled;
2766                         rx->sta->sta.smps_mode = smps_mode;
2767
2768                         sband = rx->local->hw.wiphy->bands[status->band];
2769
2770                         rate_control_rate_update(local, sband, rx->sta,
2771                                                  IEEE80211_RC_SMPS_CHANGED);
2772                         goto handled;
2773                 }
2774                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2775                         struct ieee80211_supported_band *sband;
2776                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2777                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2778
2779                         /* If it doesn't support 40 MHz it can't change ... */
2780                         if (!(rx->sta->sta.ht_cap.cap &
2781                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2782                                 goto handled;
2783
2784                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2785                                 max_bw = IEEE80211_STA_RX_BW_20;
2786                         else
2787                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2788
2789                         /* set cur_max_bandwidth and recalc sta bw */
2790                         rx->sta->cur_max_bandwidth = max_bw;
2791                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2792
2793                         if (rx->sta->sta.bandwidth == new_bw)
2794                                 goto handled;
2795
2796                         rx->sta->sta.bandwidth = new_bw;
2797                         sband = rx->local->hw.wiphy->bands[status->band];
2798
2799                         rate_control_rate_update(local, sband, rx->sta,
2800                                                  IEEE80211_RC_BW_CHANGED);
2801                         goto handled;
2802                 }
2803                 default:
2804                         goto invalid;
2805                 }
2806
2807                 break;
2808         case WLAN_CATEGORY_PUBLIC:
2809                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2810                         goto invalid;
2811                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2812                         break;
2813                 if (!rx->sta)
2814                         break;
2815                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2816                         break;
2817                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2818                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2819                         break;
2820                 if (len < offsetof(struct ieee80211_mgmt,
2821                                    u.action.u.ext_chan_switch.variable))
2822                         goto invalid;
2823                 goto queue;
2824         case WLAN_CATEGORY_VHT:
2825                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2826                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2827                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2828                     sdata->vif.type != NL80211_IFTYPE_AP &&
2829                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2830                         break;
2831
2832                 /* verify action code is present */
2833                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2834                         goto invalid;
2835
2836                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2837                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2838                         u8 opmode;
2839
2840                         /* verify opmode is present */
2841                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2842                                 goto invalid;
2843
2844                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2845
2846                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2847                                                     opmode, status->band);
2848                         goto handled;
2849                 }
2850                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2851                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2852                                 goto invalid;
2853                         goto queue;
2854                 }
2855                 default:
2856                         break;
2857                 }
2858                 break;
2859         case WLAN_CATEGORY_BACK:
2860                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2861                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2862                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2863                     sdata->vif.type != NL80211_IFTYPE_AP &&
2864                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2865                         break;
2866
2867                 /* verify action_code is present */
2868                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2869                         break;
2870
2871                 switch (mgmt->u.action.u.addba_req.action_code) {
2872                 case WLAN_ACTION_ADDBA_REQ:
2873                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2874                                    sizeof(mgmt->u.action.u.addba_req)))
2875                                 goto invalid;
2876                         break;
2877                 case WLAN_ACTION_ADDBA_RESP:
2878                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2879                                    sizeof(mgmt->u.action.u.addba_resp)))
2880                                 goto invalid;
2881                         break;
2882                 case WLAN_ACTION_DELBA:
2883                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2884                                    sizeof(mgmt->u.action.u.delba)))
2885                                 goto invalid;
2886                         break;
2887                 default:
2888                         goto invalid;
2889                 }
2890
2891                 goto queue;
2892         case WLAN_CATEGORY_SPECTRUM_MGMT:
2893                 /* verify action_code is present */
2894                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2895                         break;
2896
2897                 switch (mgmt->u.action.u.measurement.action_code) {
2898                 case WLAN_ACTION_SPCT_MSR_REQ:
2899                         if (status->band != NL80211_BAND_5GHZ)
2900                                 break;
2901
2902                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2903                                    sizeof(mgmt->u.action.u.measurement)))
2904                                 break;
2905
2906                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2907                                 break;
2908
2909                         ieee80211_process_measurement_req(sdata, mgmt, len);
2910                         goto handled;
2911                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2912                         u8 *bssid;
2913                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2914                                    sizeof(mgmt->u.action.u.chan_switch)))
2915                                 break;
2916
2917                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2918                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2919                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2920                                 break;
2921
2922                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2923                                 bssid = sdata->u.mgd.bssid;
2924                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2925                                 bssid = sdata->u.ibss.bssid;
2926                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2927                                 bssid = mgmt->sa;
2928                         else
2929                                 break;
2930
2931                         if (!ether_addr_equal(mgmt->bssid, bssid))
2932                                 break;
2933
2934                         goto queue;
2935                         }
2936                 }
2937                 break;
2938         case WLAN_CATEGORY_SA_QUERY:
2939                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2940                            sizeof(mgmt->u.action.u.sa_query)))
2941                         break;
2942
2943                 switch (mgmt->u.action.u.sa_query.action) {
2944                 case WLAN_ACTION_SA_QUERY_REQUEST:
2945                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2946                                 break;
2947                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2948                         goto handled;
2949                 }
2950                 break;
2951         case WLAN_CATEGORY_SELF_PROTECTED:
2952                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2953                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2954                         break;
2955
2956                 switch (mgmt->u.action.u.self_prot.action_code) {
2957                 case WLAN_SP_MESH_PEERING_OPEN:
2958                 case WLAN_SP_MESH_PEERING_CLOSE:
2959                 case WLAN_SP_MESH_PEERING_CONFIRM:
2960                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2961                                 goto invalid;
2962                         if (sdata->u.mesh.user_mpm)
2963                                 /* userspace handles this frame */
2964                                 break;
2965                         goto queue;
2966                 case WLAN_SP_MGK_INFORM:
2967                 case WLAN_SP_MGK_ACK:
2968                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2969                                 goto invalid;
2970                         break;
2971                 }
2972                 break;
2973         case WLAN_CATEGORY_MESH_ACTION:
2974                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2975                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2976                         break;
2977
2978                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2979                         break;
2980                 if (mesh_action_is_path_sel(mgmt) &&
2981                     !mesh_path_sel_is_hwmp(sdata))
2982                         break;
2983                 goto queue;
2984         }
2985
2986         return RX_CONTINUE;
2987
2988  invalid:
2989         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2990         /* will return in the next handlers */
2991         return RX_CONTINUE;
2992
2993  handled:
2994         if (rx->sta)
2995                 rx->sta->rx_stats.packets++;
2996         dev_kfree_skb(rx->skb);
2997         return RX_QUEUED;
2998
2999  queue:
3000         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3001         skb_queue_tail(&sdata->skb_queue, rx->skb);
3002         ieee80211_queue_work(&local->hw, &sdata->work);
3003         if (rx->sta)
3004                 rx->sta->rx_stats.packets++;
3005         return RX_QUEUED;
3006 }
3007
3008 static ieee80211_rx_result debug_noinline
3009 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3010 {
3011         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3012         int sig = 0;
3013
3014         /* skip known-bad action frames and return them in the next handler */
3015         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3016                 return RX_CONTINUE;
3017
3018         /*
3019          * Getting here means the kernel doesn't know how to handle
3020          * it, but maybe userspace does ... include returned frames
3021          * so userspace can register for those to know whether ones
3022          * it transmitted were processed or returned.
3023          */
3024
3025         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3026                 sig = status->signal;
3027
3028         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3029                              rx->skb->data, rx->skb->len, 0)) {
3030                 if (rx->sta)
3031                         rx->sta->rx_stats.packets++;
3032                 dev_kfree_skb(rx->skb);
3033                 return RX_QUEUED;
3034         }
3035
3036         return RX_CONTINUE;
3037 }
3038
3039 static ieee80211_rx_result debug_noinline
3040 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3041 {
3042         struct ieee80211_local *local = rx->local;
3043         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3044         struct sk_buff *nskb;
3045         struct ieee80211_sub_if_data *sdata = rx->sdata;
3046         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3047
3048         if (!ieee80211_is_action(mgmt->frame_control))
3049                 return RX_CONTINUE;
3050
3051         /*
3052          * For AP mode, hostapd is responsible for handling any action
3053          * frames that we didn't handle, including returning unknown
3054          * ones. For all other modes we will return them to the sender,
3055          * setting the 0x80 bit in the action category, as required by
3056          * 802.11-2012 9.24.4.
3057          * Newer versions of hostapd shall also use the management frame
3058          * registration mechanisms, but older ones still use cooked
3059          * monitor interfaces so push all frames there.
3060          */
3061         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3062             (sdata->vif.type == NL80211_IFTYPE_AP ||
3063              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3064                 return RX_DROP_MONITOR;
3065
3066         if (is_multicast_ether_addr(mgmt->da))
3067                 return RX_DROP_MONITOR;
3068
3069         /* do not return rejected action frames */
3070         if (mgmt->u.action.category & 0x80)
3071                 return RX_DROP_UNUSABLE;
3072
3073         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3074                                GFP_ATOMIC);
3075         if (nskb) {
3076                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3077
3078                 nmgmt->u.action.category |= 0x80;
3079                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3080                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3081
3082                 memset(nskb->cb, 0, sizeof(nskb->cb));
3083
3084                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3085                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3086
3087                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3088                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3089                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3090                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3091                                 info->hw_queue =
3092                                         local->hw.offchannel_tx_hw_queue;
3093                 }
3094
3095                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3096                                             status->band);
3097         }
3098         dev_kfree_skb(rx->skb);
3099         return RX_QUEUED;
3100 }
3101
3102 static ieee80211_rx_result debug_noinline
3103 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3104 {
3105         struct ieee80211_sub_if_data *sdata = rx->sdata;
3106         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3107         __le16 stype;
3108
3109         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3110
3111         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3112             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3113             sdata->vif.type != NL80211_IFTYPE_OCB &&
3114             sdata->vif.type != NL80211_IFTYPE_STATION)
3115                 return RX_DROP_MONITOR;
3116
3117         switch (stype) {
3118         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3119         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3120         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3121                 /* process for all: mesh, mlme, ibss */
3122                 break;
3123         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3124         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3125         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3126         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3127                 if (is_multicast_ether_addr(mgmt->da) &&
3128                     !is_broadcast_ether_addr(mgmt->da))
3129                         return RX_DROP_MONITOR;
3130
3131                 /* process only for station */
3132                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3133                         return RX_DROP_MONITOR;
3134                 break;
3135         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3136                 /* process only for ibss and mesh */
3137                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3138                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3139                         return RX_DROP_MONITOR;
3140                 break;
3141         default:
3142                 return RX_DROP_MONITOR;
3143         }
3144
3145         /* queue up frame and kick off work to process it */
3146         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3147         skb_queue_tail(&sdata->skb_queue, rx->skb);
3148         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3149         if (rx->sta)
3150                 rx->sta->rx_stats.packets++;
3151
3152         return RX_QUEUED;
3153 }
3154
3155 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3156                                         struct ieee80211_rate *rate)
3157 {
3158         struct ieee80211_sub_if_data *sdata;
3159         struct ieee80211_local *local = rx->local;
3160         struct sk_buff *skb = rx->skb, *skb2;
3161         struct net_device *prev_dev = NULL;
3162         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3163         int needed_headroom;
3164
3165         /*
3166          * If cooked monitor has been processed already, then
3167          * don't do it again. If not, set the flag.
3168          */
3169         if (rx->flags & IEEE80211_RX_CMNTR)
3170                 goto out_free_skb;
3171         rx->flags |= IEEE80211_RX_CMNTR;
3172
3173         /* If there are no cooked monitor interfaces, just free the SKB */
3174         if (!local->cooked_mntrs)
3175                 goto out_free_skb;
3176
3177         /* vendor data is long removed here */
3178         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3179         /* room for the radiotap header based on driver features */
3180         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3181
3182         if (skb_headroom(skb) < needed_headroom &&
3183             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3184                 goto out_free_skb;
3185
3186         /* prepend radiotap information */
3187         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3188                                          false);
3189
3190         skb_reset_mac_header(skb);
3191         skb->ip_summed = CHECKSUM_UNNECESSARY;
3192         skb->pkt_type = PACKET_OTHERHOST;
3193         skb->protocol = htons(ETH_P_802_2);
3194
3195         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3196                 if (!ieee80211_sdata_running(sdata))
3197                         continue;
3198
3199                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3200                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3201                         continue;
3202
3203                 if (prev_dev) {
3204                         skb2 = skb_clone(skb, GFP_ATOMIC);
3205                         if (skb2) {
3206                                 skb2->dev = prev_dev;
3207                                 netif_receive_skb(skb2);
3208                         }
3209                 }
3210
3211                 prev_dev = sdata->dev;
3212                 ieee80211_rx_stats(sdata->dev, skb->len);
3213         }
3214
3215         if (prev_dev) {
3216                 skb->dev = prev_dev;
3217                 netif_receive_skb(skb);
3218                 return;
3219         }
3220
3221  out_free_skb:
3222         dev_kfree_skb(skb);
3223 }
3224
3225 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3226                                          ieee80211_rx_result res)
3227 {
3228         switch (res) {
3229         case RX_DROP_MONITOR:
3230                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3231                 if (rx->sta)
3232                         rx->sta->rx_stats.dropped++;
3233                 /* fall through */
3234         case RX_CONTINUE: {
3235                 struct ieee80211_rate *rate = NULL;
3236                 struct ieee80211_supported_band *sband;
3237                 struct ieee80211_rx_status *status;
3238
3239                 status = IEEE80211_SKB_RXCB((rx->skb));
3240
3241                 sband = rx->local->hw.wiphy->bands[status->band];
3242                 if (!(status->flag & RX_FLAG_HT) &&
3243                     !(status->flag & RX_FLAG_VHT))
3244                         rate = &sband->bitrates[status->rate_idx];
3245
3246                 ieee80211_rx_cooked_monitor(rx, rate);
3247                 break;
3248                 }
3249         case RX_DROP_UNUSABLE:
3250                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3251                 if (rx->sta)
3252                         rx->sta->rx_stats.dropped++;
3253                 dev_kfree_skb(rx->skb);
3254                 break;
3255         case RX_QUEUED:
3256                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3257                 break;
3258         }
3259 }
3260
3261 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3262                                   struct sk_buff_head *frames)
3263 {
3264         ieee80211_rx_result res = RX_DROP_MONITOR;
3265         struct sk_buff *skb;
3266
3267 #define CALL_RXH(rxh)                   \
3268         do {                            \
3269                 res = rxh(rx);          \
3270                 if (res != RX_CONTINUE) \
3271                         goto rxh_next;  \
3272         } while (0)
3273
3274         /* Lock here to avoid hitting all of the data used in the RX
3275          * path (e.g. key data, station data, ...) concurrently when
3276          * a frame is released from the reorder buffer due to timeout
3277          * from the timer, potentially concurrently with RX from the
3278          * driver.
3279          */
3280         spin_lock_bh(&rx->local->rx_path_lock);
3281
3282         while ((skb = __skb_dequeue(frames))) {
3283                 /*
3284                  * all the other fields are valid across frames
3285                  * that belong to an aMPDU since they are on the
3286                  * same TID from the same station
3287                  */
3288                 rx->skb = skb;
3289
3290                 CALL_RXH(ieee80211_rx_h_check_more_data);
3291                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3292                 CALL_RXH(ieee80211_rx_h_sta_process);
3293                 CALL_RXH(ieee80211_rx_h_decrypt);
3294                 CALL_RXH(ieee80211_rx_h_defragment);
3295                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3296                 /* must be after MMIC verify so header is counted in MPDU mic */
3297 #ifdef CONFIG_MAC80211_MESH
3298                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3299                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3300 #endif
3301                 CALL_RXH(ieee80211_rx_h_amsdu);
3302                 CALL_RXH(ieee80211_rx_h_data);
3303
3304                 /* special treatment -- needs the queue */
3305                 res = ieee80211_rx_h_ctrl(rx, frames);
3306                 if (res != RX_CONTINUE)
3307                         goto rxh_next;
3308
3309                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3310                 CALL_RXH(ieee80211_rx_h_action);
3311                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3312                 CALL_RXH(ieee80211_rx_h_action_return);
3313                 CALL_RXH(ieee80211_rx_h_mgmt);
3314
3315  rxh_next:
3316                 ieee80211_rx_handlers_result(rx, res);
3317
3318 #undef CALL_RXH
3319         }
3320
3321         spin_unlock_bh(&rx->local->rx_path_lock);
3322 }
3323
3324 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3325 {
3326         struct sk_buff_head reorder_release;
3327         ieee80211_rx_result res = RX_DROP_MONITOR;
3328
3329         __skb_queue_head_init(&reorder_release);
3330
3331 #define CALL_RXH(rxh)                   \
3332         do {                            \
3333                 res = rxh(rx);          \
3334                 if (res != RX_CONTINUE) \
3335                         goto rxh_next;  \
3336         } while (0)
3337
3338         CALL_RXH(ieee80211_rx_h_check_dup);
3339         CALL_RXH(ieee80211_rx_h_check);
3340
3341         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3342
3343         ieee80211_rx_handlers(rx, &reorder_release);
3344         return;
3345
3346  rxh_next:
3347         ieee80211_rx_handlers_result(rx, res);
3348
3349 #undef CALL_RXH
3350 }
3351
3352 /*
3353  * This function makes calls into the RX path, therefore
3354  * it has to be invoked under RCU read lock.
3355  */
3356 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3357 {
3358         struct sk_buff_head frames;
3359         struct ieee80211_rx_data rx = {
3360                 .sta = sta,
3361                 .sdata = sta->sdata,
3362                 .local = sta->local,
3363                 /* This is OK -- must be QoS data frame */
3364                 .security_idx = tid,
3365                 .seqno_idx = tid,
3366                 .napi = NULL, /* must be NULL to not have races */
3367         };
3368         struct tid_ampdu_rx *tid_agg_rx;
3369
3370         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3371         if (!tid_agg_rx)
3372                 return;
3373
3374         __skb_queue_head_init(&frames);
3375
3376         spin_lock(&tid_agg_rx->reorder_lock);
3377         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3378         spin_unlock(&tid_agg_rx->reorder_lock);
3379
3380         if (!skb_queue_empty(&frames)) {
3381                 struct ieee80211_event event = {
3382                         .type = BA_FRAME_TIMEOUT,
3383                         .u.ba.tid = tid,
3384                         .u.ba.sta = &sta->sta,
3385                 };
3386                 drv_event_callback(rx.local, rx.sdata, &event);
3387         }
3388
3389         ieee80211_rx_handlers(&rx, &frames);
3390 }
3391
3392 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3393                                           u16 ssn, u64 filtered,
3394                                           u16 received_mpdus)
3395 {
3396         struct sta_info *sta;
3397         struct tid_ampdu_rx *tid_agg_rx;
3398         struct sk_buff_head frames;
3399         struct ieee80211_rx_data rx = {
3400                 /* This is OK -- must be QoS data frame */
3401                 .security_idx = tid,
3402                 .seqno_idx = tid,
3403         };
3404         int i, diff;
3405
3406         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3407                 return;
3408
3409         __skb_queue_head_init(&frames);
3410
3411         sta = container_of(pubsta, struct sta_info, sta);
3412
3413         rx.sta = sta;
3414         rx.sdata = sta->sdata;
3415         rx.local = sta->local;
3416
3417         rcu_read_lock();
3418         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3419         if (!tid_agg_rx)
3420                 goto out;
3421
3422         spin_lock_bh(&tid_agg_rx->reorder_lock);
3423
3424         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3425                 int release;
3426
3427                 /* release all frames in the reorder buffer */
3428                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3429                            IEEE80211_SN_MODULO;
3430                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3431                                                  release, &frames);
3432                 /* update ssn to match received ssn */
3433                 tid_agg_rx->head_seq_num = ssn;
3434         } else {
3435                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3436                                                  &frames);
3437         }
3438
3439         /* handle the case that received ssn is behind the mac ssn.
3440          * it can be tid_agg_rx->buf_size behind and still be valid */
3441         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3442         if (diff >= tid_agg_rx->buf_size) {
3443                 tid_agg_rx->reorder_buf_filtered = 0;
3444                 goto release;
3445         }
3446         filtered = filtered >> diff;
3447         ssn += diff;
3448
3449         /* update bitmap */
3450         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3451                 int index = (ssn + i) % tid_agg_rx->buf_size;
3452
3453                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3454                 if (filtered & BIT_ULL(i))
3455                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3456         }
3457
3458         /* now process also frames that the filter marking released */
3459         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3460
3461 release:
3462         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3463
3464         ieee80211_rx_handlers(&rx, &frames);
3465
3466  out:
3467         rcu_read_unlock();
3468 }
3469 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3470
3471 /* main receive path */
3472
3473 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3474 {
3475         struct ieee80211_sub_if_data *sdata = rx->sdata;
3476         struct sk_buff *skb = rx->skb;
3477         struct ieee80211_hdr *hdr = (void *)skb->data;
3478         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3479         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3480         int multicast = is_multicast_ether_addr(hdr->addr1);
3481
3482         switch (sdata->vif.type) {
3483         case NL80211_IFTYPE_STATION:
3484                 if (!bssid && !sdata->u.mgd.use_4addr)
3485                         return false;
3486                 if (multicast)
3487                         return true;
3488                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3489         case NL80211_IFTYPE_ADHOC:
3490                 if (!bssid)
3491                         return false;
3492                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3493                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3494                         return false;
3495                 if (ieee80211_is_beacon(hdr->frame_control))
3496                         return true;
3497                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3498                         return false;
3499                 if (!multicast &&
3500                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3501                         return false;
3502                 if (!rx->sta) {
3503                         int rate_idx;
3504                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3505                                 rate_idx = 0; /* TODO: HT/VHT rates */
3506                         else
3507                                 rate_idx = status->rate_idx;
3508                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3509                                                  BIT(rate_idx));
3510                 }
3511                 return true;
3512         case NL80211_IFTYPE_OCB:
3513                 if (!bssid)
3514                         return false;
3515                 if (!ieee80211_is_data_present(hdr->frame_control))
3516                         return false;
3517                 if (!is_broadcast_ether_addr(bssid))
3518                         return false;
3519                 if (!multicast &&
3520                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3521                         return false;
3522                 if (!rx->sta) {
3523                         int rate_idx;
3524                         if (status->flag & RX_FLAG_HT)
3525                                 rate_idx = 0; /* TODO: HT rates */
3526                         else
3527                                 rate_idx = status->rate_idx;
3528                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3529                                                 BIT(rate_idx));
3530                 }
3531                 return true;
3532         case NL80211_IFTYPE_MESH_POINT:
3533                 if (multicast)
3534                         return true;
3535                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3536         case NL80211_IFTYPE_AP_VLAN:
3537         case NL80211_IFTYPE_AP:
3538                 if (!bssid)
3539                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3540
3541                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3542                         /*
3543                          * Accept public action frames even when the
3544                          * BSSID doesn't match, this is used for P2P
3545                          * and location updates. Note that mac80211
3546                          * itself never looks at these frames.
3547                          */
3548                         if (!multicast &&
3549                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3550                                 return false;
3551                         if (ieee80211_is_public_action(hdr, skb->len))
3552                                 return true;
3553                         return ieee80211_is_beacon(hdr->frame_control);
3554                 }
3555
3556                 if (!ieee80211_has_tods(hdr->frame_control)) {
3557                         /* ignore data frames to TDLS-peers */
3558                         if (ieee80211_is_data(hdr->frame_control))
3559                                 return false;
3560                         /* ignore action frames to TDLS-peers */
3561                         if (ieee80211_is_action(hdr->frame_control) &&
3562                             !is_broadcast_ether_addr(bssid) &&
3563                             !ether_addr_equal(bssid, hdr->addr1))
3564                                 return false;
3565                 }
3566                 return true;
3567         case NL80211_IFTYPE_WDS:
3568                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3569                         return false;
3570                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3571         case NL80211_IFTYPE_P2P_DEVICE:
3572                 return ieee80211_is_public_action(hdr, skb->len) ||
3573                        ieee80211_is_probe_req(hdr->frame_control) ||
3574                        ieee80211_is_probe_resp(hdr->frame_control) ||
3575                        ieee80211_is_beacon(hdr->frame_control);
3576         default:
3577                 break;
3578         }
3579
3580         WARN_ON_ONCE(1);
3581         return false;
3582 }
3583
3584 void ieee80211_check_fast_rx(struct sta_info *sta)
3585 {
3586         struct ieee80211_sub_if_data *sdata = sta->sdata;
3587         struct ieee80211_local *local = sdata->local;
3588         struct ieee80211_key *key;
3589         struct ieee80211_fast_rx fastrx = {
3590                 .dev = sdata->dev,
3591                 .vif_type = sdata->vif.type,
3592                 .control_port_protocol = sdata->control_port_protocol,
3593         }, *old, *new = NULL;
3594         bool assign = false;
3595
3596         /* use sparse to check that we don't return without updating */
3597         __acquire(check_fast_rx);
3598
3599         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3600         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3601         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3602         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3603
3604         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3605
3606         /* fast-rx doesn't do reordering */
3607         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3608             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3609                 goto clear;
3610
3611         switch (sdata->vif.type) {
3612         case NL80211_IFTYPE_STATION:
3613                 /* 4-addr is harder to deal with, later maybe */
3614                 if (sdata->u.mgd.use_4addr)
3615                         goto clear;
3616                 /* software powersave is a huge mess, avoid all of it */
3617                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3618                         goto clear;
3619                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3620                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3621                         goto clear;
3622                 if (sta->sta.tdls) {
3623                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3624                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3625                         fastrx.expected_ds_bits = 0;
3626                 } else {
3627                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3628                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3629                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3630                         fastrx.expected_ds_bits =
3631                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3632                 }
3633                 break;
3634         case NL80211_IFTYPE_AP_VLAN:
3635         case NL80211_IFTYPE_AP:
3636                 /* parallel-rx requires this, at least with calls to
3637                  * ieee80211_sta_ps_transition()
3638                  */
3639                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3640                         goto clear;
3641                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3642                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3643                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3644
3645                 fastrx.internal_forward =
3646                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3647                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3648                          !sdata->u.vlan.sta);
3649                 break;
3650         default:
3651                 goto clear;
3652         }
3653
3654         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3655                 goto clear;
3656
3657         rcu_read_lock();
3658         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3659         if (key) {
3660                 switch (key->conf.cipher) {
3661                 case WLAN_CIPHER_SUITE_TKIP:
3662                         /* we don't want to deal with MMIC in fast-rx */
3663                         goto clear_rcu;
3664                 case WLAN_CIPHER_SUITE_CCMP:
3665                 case WLAN_CIPHER_SUITE_CCMP_256:
3666                 case WLAN_CIPHER_SUITE_GCMP:
3667                 case WLAN_CIPHER_SUITE_GCMP_256:
3668                         break;
3669                 default:
3670                         /* we also don't want to deal with WEP or cipher scheme
3671                          * since those require looking up the key idx in the
3672                          * frame, rather than assuming the PTK is used
3673                          * (we need to revisit this once we implement the real
3674                          * PTK index, which is now valid in the spec, but we
3675                          * haven't implemented that part yet)
3676                          */
3677                         goto clear_rcu;
3678                 }
3679
3680                 fastrx.key = true;
3681                 fastrx.icv_len = key->conf.icv_len;
3682         }
3683
3684         assign = true;
3685  clear_rcu:
3686         rcu_read_unlock();
3687  clear:
3688         __release(check_fast_rx);
3689
3690         if (assign)
3691                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3692
3693         spin_lock_bh(&sta->lock);
3694         old = rcu_dereference_protected(sta->fast_rx, true);
3695         rcu_assign_pointer(sta->fast_rx, new);
3696         spin_unlock_bh(&sta->lock);
3697
3698         if (old)
3699                 kfree_rcu(old, rcu_head);
3700 }
3701
3702 void ieee80211_clear_fast_rx(struct sta_info *sta)
3703 {
3704         struct ieee80211_fast_rx *old;
3705
3706         spin_lock_bh(&sta->lock);
3707         old = rcu_dereference_protected(sta->fast_rx, true);
3708         RCU_INIT_POINTER(sta->fast_rx, NULL);
3709         spin_unlock_bh(&sta->lock);
3710
3711         if (old)
3712                 kfree_rcu(old, rcu_head);
3713 }
3714
3715 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3716 {
3717         struct ieee80211_local *local = sdata->local;
3718         struct sta_info *sta;
3719
3720         lockdep_assert_held(&local->sta_mtx);
3721
3722         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3723                 if (sdata != sta->sdata &&
3724                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3725                         continue;
3726                 ieee80211_check_fast_rx(sta);
3727         }
3728 }
3729
3730 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3731 {
3732         struct ieee80211_local *local = sdata->local;
3733
3734         mutex_lock(&local->sta_mtx);
3735         __ieee80211_check_fast_rx_iface(sdata);
3736         mutex_unlock(&local->sta_mtx);
3737 }
3738
3739 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3740                                      struct ieee80211_fast_rx *fast_rx)
3741 {
3742         struct sk_buff *skb = rx->skb;
3743         struct ieee80211_hdr *hdr = (void *)skb->data;
3744         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3745         struct sta_info *sta = rx->sta;
3746         int orig_len = skb->len;
3747         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3748         struct {
3749                 u8 snap[sizeof(rfc1042_header)];
3750                 __be16 proto;
3751         } *payload __aligned(2);
3752         struct {
3753                 u8 da[ETH_ALEN];
3754                 u8 sa[ETH_ALEN];
3755         } addrs __aligned(2);
3756         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3757
3758         if (fast_rx->uses_rss)
3759                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3760
3761         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3762          * to a common data structure; drivers can implement that per queue
3763          * but we don't have that information in mac80211
3764          */
3765         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3766                 return false;
3767
3768 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3769
3770         /* If using encryption, we also need to have:
3771          *  - PN_VALIDATED: similar, but the implementation is tricky
3772          *  - DECRYPTED: necessary for PN_VALIDATED
3773          */
3774         if (fast_rx->key &&
3775             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3776                 return false;
3777
3778         /* we don't deal with A-MSDU deaggregation here */
3779         if (status->rx_flags & IEEE80211_RX_AMSDU)
3780                 return false;
3781
3782         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3783                 return false;
3784
3785         if (unlikely(ieee80211_is_frag(hdr)))
3786                 return false;
3787
3788         /* Since our interface address cannot be multicast, this
3789          * implicitly also rejects multicast frames without the
3790          * explicit check.
3791          *
3792          * We shouldn't get any *data* frames not addressed to us
3793          * (AP mode will accept multicast *management* frames), but
3794          * punting here will make it go through the full checks in
3795          * ieee80211_accept_frame().
3796          */
3797         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3798                 return false;
3799
3800         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3801                                               IEEE80211_FCTL_TODS)) !=
3802             fast_rx->expected_ds_bits)
3803                 goto drop;
3804
3805         /* assign the key to drop unencrypted frames (later)
3806          * and strip the IV/MIC if necessary
3807          */
3808         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3809                 /* GCMP header length is the same */
3810                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3811         }
3812
3813         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3814                 goto drop;
3815         payload = (void *)(skb->data + snap_offs);
3816
3817         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3818                 return false;
3819
3820         /* Don't handle these here since they require special code.
3821          * Accept AARP and IPX even though they should come with a
3822          * bridge-tunnel header - but if we get them this way then
3823          * there's little point in discarding them.
3824          */
3825         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3826                      payload->proto == fast_rx->control_port_protocol))
3827                 return false;
3828
3829         /* after this point, don't punt to the slowpath! */
3830
3831         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3832             pskb_trim(skb, skb->len - fast_rx->icv_len))
3833                 goto drop;
3834
3835         if (unlikely(fast_rx->sta_notify)) {
3836                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3837                 fast_rx->sta_notify = false;
3838         }
3839
3840         /* statistics part of ieee80211_rx_h_sta_process() */
3841         stats->last_rx = jiffies;
3842         stats->last_rate = sta_stats_encode_rate(status);
3843
3844         stats->fragments++;
3845
3846         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3847                 stats->last_signal = status->signal;
3848                 if (!fast_rx->uses_rss)
3849                         ewma_signal_add(&sta->rx_stats_avg.signal,
3850                                         -status->signal);
3851         }
3852
3853         if (status->chains) {
3854                 int i;
3855
3856                 stats->chains = status->chains;
3857                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3858                         int signal = status->chain_signal[i];
3859
3860                         if (!(status->chains & BIT(i)))
3861                                 continue;
3862
3863                         stats->chain_signal_last[i] = signal;
3864                         if (!fast_rx->uses_rss)
3865                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3866                                                 -signal);
3867                 }
3868         }
3869         /* end of statistics */
3870
3871         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3872                 goto drop;
3873
3874         /* do the header conversion - first grab the addresses */
3875         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3876         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3877         /* remove the SNAP but leave the ethertype */
3878         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3879         /* push the addresses in front */
3880         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3881
3882         skb->dev = fast_rx->dev;
3883
3884         ieee80211_rx_stats(fast_rx->dev, skb->len);
3885
3886         /* The seqno index has the same property as needed
3887          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3888          * for non-QoS-data frames. Here we know it's a data
3889          * frame, so count MSDUs.
3890          */
3891         u64_stats_update_begin(&stats->syncp);
3892         stats->msdu[rx->seqno_idx]++;
3893         stats->bytes += orig_len;
3894         u64_stats_update_end(&stats->syncp);
3895
3896         if (fast_rx->internal_forward) {
3897                 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3898
3899                 if (dsta) {
3900                         /*
3901                          * Send to wireless media and increase priority by 256
3902                          * to keep the received priority instead of
3903                          * reclassifying the frame (see cfg80211_classify8021d).
3904                          */
3905                         skb->priority += 256;
3906                         skb->protocol = htons(ETH_P_802_3);
3907                         skb_reset_network_header(skb);
3908                         skb_reset_mac_header(skb);
3909                         dev_queue_xmit(skb);
3910                         return true;
3911                 }
3912         }
3913
3914         /* deliver to local stack */
3915         skb->protocol = eth_type_trans(skb, fast_rx->dev);
3916         memset(skb->cb, 0, sizeof(skb->cb));
3917         if (rx->napi)
3918                 napi_gro_receive(rx->napi, skb);
3919         else
3920                 netif_receive_skb(skb);
3921
3922         return true;
3923  drop:
3924         dev_kfree_skb(skb);
3925         stats->dropped++;
3926         return true;
3927 }
3928
3929 /*
3930  * This function returns whether or not the SKB
3931  * was destined for RX processing or not, which,
3932  * if consume is true, is equivalent to whether
3933  * or not the skb was consumed.
3934  */
3935 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3936                                             struct sk_buff *skb, bool consume)
3937 {
3938         struct ieee80211_local *local = rx->local;
3939         struct ieee80211_sub_if_data *sdata = rx->sdata;
3940
3941         rx->skb = skb;
3942
3943         /* See if we can do fast-rx; if we have to copy we already lost,
3944          * so punt in that case. We should never have to deliver a data
3945          * frame to multiple interfaces anyway.
3946          *
3947          * We skip the ieee80211_accept_frame() call and do the necessary
3948          * checking inside ieee80211_invoke_fast_rx().
3949          */
3950         if (consume && rx->sta) {
3951                 struct ieee80211_fast_rx *fast_rx;
3952
3953                 fast_rx = rcu_dereference(rx->sta->fast_rx);
3954                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
3955                         return true;
3956         }
3957
3958         if (!ieee80211_accept_frame(rx))
3959                 return false;
3960
3961         if (!consume) {
3962                 skb = skb_copy(skb, GFP_ATOMIC);
3963                 if (!skb) {
3964                         if (net_ratelimit())
3965                                 wiphy_debug(local->hw.wiphy,
3966                                         "failed to copy skb for %s\n",
3967                                         sdata->name);
3968                         return true;
3969                 }
3970
3971                 rx->skb = skb;
3972         }
3973
3974         ieee80211_invoke_rx_handlers(rx);
3975         return true;
3976 }
3977
3978 /*
3979  * This is the actual Rx frames handler. as it belongs to Rx path it must
3980  * be called with rcu_read_lock protection.
3981  */
3982 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3983                                          struct ieee80211_sta *pubsta,
3984                                          struct sk_buff *skb,
3985                                          struct napi_struct *napi)
3986 {
3987         struct ieee80211_local *local = hw_to_local(hw);
3988         struct ieee80211_sub_if_data *sdata;
3989         struct ieee80211_hdr *hdr;
3990         __le16 fc;
3991         struct ieee80211_rx_data rx;
3992         struct ieee80211_sub_if_data *prev;
3993         struct rhash_head *tmp;
3994         int err = 0;
3995
3996         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3997         memset(&rx, 0, sizeof(rx));
3998         rx.skb = skb;
3999         rx.local = local;
4000         rx.napi = napi;
4001
4002         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4003                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4004
4005         if (ieee80211_is_mgmt(fc)) {
4006                 /* drop frame if too short for header */
4007                 if (skb->len < ieee80211_hdrlen(fc))
4008                         err = -ENOBUFS;
4009                 else
4010                         err = skb_linearize(skb);
4011         } else {
4012                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4013         }
4014
4015         if (err) {
4016                 dev_kfree_skb(skb);
4017                 return;
4018         }
4019
4020         hdr = (struct ieee80211_hdr *)skb->data;
4021         ieee80211_parse_qos(&rx);
4022         ieee80211_verify_alignment(&rx);
4023
4024         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4025                      ieee80211_is_beacon(hdr->frame_control)))
4026                 ieee80211_scan_rx(local, skb);
4027
4028         if (pubsta) {
4029                 rx.sta = container_of(pubsta, struct sta_info, sta);
4030                 rx.sdata = rx.sta->sdata;
4031                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4032                         return;
4033                 goto out;
4034         } else if (ieee80211_is_data(fc)) {
4035                 struct sta_info *sta, *prev_sta;
4036                 const struct bucket_table *tbl;
4037
4038                 prev_sta = NULL;
4039
4040                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
4041
4042                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
4043                         if (!prev_sta) {
4044                                 prev_sta = sta;
4045                                 continue;
4046                         }
4047
4048                         rx.sta = prev_sta;
4049                         rx.sdata = prev_sta->sdata;
4050                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4051
4052                         prev_sta = sta;
4053                 }
4054
4055                 if (prev_sta) {
4056                         rx.sta = prev_sta;
4057                         rx.sdata = prev_sta->sdata;
4058
4059                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4060                                 return;
4061                         goto out;
4062                 }
4063         }
4064
4065         prev = NULL;
4066
4067         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4068                 if (!ieee80211_sdata_running(sdata))
4069                         continue;
4070
4071                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4072                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4073                         continue;
4074
4075                 /*
4076                  * frame is destined for this interface, but if it's
4077                  * not also for the previous one we handle that after
4078                  * the loop to avoid copying the SKB once too much
4079                  */
4080
4081                 if (!prev) {
4082                         prev = sdata;
4083                         continue;
4084                 }
4085
4086                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4087                 rx.sdata = prev;
4088                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4089
4090                 prev = sdata;
4091         }
4092
4093         if (prev) {
4094                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4095                 rx.sdata = prev;
4096
4097                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4098                         return;
4099         }
4100
4101  out:
4102         dev_kfree_skb(skb);
4103 }
4104
4105 /*
4106  * This is the receive path handler. It is called by a low level driver when an
4107  * 802.11 MPDU is received from the hardware.
4108  */
4109 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4110                        struct sk_buff *skb, struct napi_struct *napi)
4111 {
4112         struct ieee80211_local *local = hw_to_local(hw);
4113         struct ieee80211_rate *rate = NULL;
4114         struct ieee80211_supported_band *sband;
4115         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4116
4117         WARN_ON_ONCE(softirq_count() == 0);
4118
4119         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4120                 goto drop;
4121
4122         sband = local->hw.wiphy->bands[status->band];
4123         if (WARN_ON(!sband))
4124                 goto drop;
4125
4126         /*
4127          * If we're suspending, it is possible although not too likely
4128          * that we'd be receiving frames after having already partially
4129          * quiesced the stack. We can't process such frames then since
4130          * that might, for example, cause stations to be added or other
4131          * driver callbacks be invoked.
4132          */
4133         if (unlikely(local->quiescing || local->suspended))
4134                 goto drop;
4135
4136         /* We might be during a HW reconfig, prevent Rx for the same reason */
4137         if (unlikely(local->in_reconfig))
4138                 goto drop;
4139
4140         /*
4141          * The same happens when we're not even started,
4142          * but that's worth a warning.
4143          */
4144         if (WARN_ON(!local->started))
4145                 goto drop;
4146
4147         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4148                 /*
4149                  * Validate the rate, unless a PLCP error means that
4150                  * we probably can't have a valid rate here anyway.
4151                  */
4152
4153                 if (status->flag & RX_FLAG_HT) {
4154                         /*
4155                          * rate_idx is MCS index, which can be [0-76]
4156                          * as documented on:
4157                          *
4158                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4159                          *
4160                          * Anything else would be some sort of driver or
4161                          * hardware error. The driver should catch hardware
4162                          * errors.
4163                          */
4164                         if (WARN(status->rate_idx > 76,
4165                                  "Rate marked as an HT rate but passed "
4166                                  "status->rate_idx is not "
4167                                  "an MCS index [0-76]: %d (0x%02x)\n",
4168                                  status->rate_idx,
4169                                  status->rate_idx))
4170                                 goto drop;
4171                 } else if (status->flag & RX_FLAG_VHT) {
4172                         if (WARN_ONCE(status->rate_idx > 9 ||
4173                                       !status->vht_nss ||
4174                                       status->vht_nss > 8,
4175                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4176                                       status->rate_idx, status->vht_nss))
4177                                 goto drop;
4178                 } else {
4179                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4180                                 goto drop;
4181                         rate = &sband->bitrates[status->rate_idx];
4182                 }
4183         }
4184
4185         status->rx_flags = 0;
4186
4187         /*
4188          * key references and virtual interfaces are protected using RCU
4189          * and this requires that we are in a read-side RCU section during
4190          * receive processing
4191          */
4192         rcu_read_lock();
4193
4194         /*
4195          * Frames with failed FCS/PLCP checksum are not returned,
4196          * all other frames are returned without radiotap header
4197          * if it was previously present.
4198          * Also, frames with less than 16 bytes are dropped.
4199          */
4200         skb = ieee80211_rx_monitor(local, skb, rate);
4201         if (!skb) {
4202                 rcu_read_unlock();
4203                 return;
4204         }
4205
4206         ieee80211_tpt_led_trig_rx(local,
4207                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4208                         skb->len);
4209
4210         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4211
4212         rcu_read_unlock();
4213
4214         return;
4215  drop:
4216         kfree_skb(skb);
4217 }
4218 EXPORT_SYMBOL(ieee80211_rx_napi);
4219
4220 /* This is a version of the rx handler that can be called from hard irq
4221  * context. Post the skb on the queue and schedule the tasklet */
4222 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4223 {
4224         struct ieee80211_local *local = hw_to_local(hw);
4225
4226         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4227
4228         skb->pkt_type = IEEE80211_RX_MSG;
4229         skb_queue_tail(&local->skb_queue, skb);
4230         tasklet_schedule(&local->tasklet);
4231 }
4232 EXPORT_SYMBOL(ieee80211_rx_irqsafe);