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 - 2017 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 void remove_monitor_info(struct sk_buff *skb,
  99                                 unsigned int present_fcs_len,
 100                                 unsigned int rtap_vendor_space)
 101 {
 102         if (present_fcs_len)
 103                 __pskb_trim(skb, skb->len - present_fcs_len);
 104         __pskb_pull(skb, rtap_vendor_space);
 105 }
 106
 107 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 108                                      unsigned int rtap_vendor_space)
 109 {
 110         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 111         struct ieee80211_hdr *hdr;
 112
 113         hdr = (void *)(skb->data + rtap_vendor_space);
 114
 115         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 116                             RX_FLAG_FAILED_PLCP_CRC |
 117                             RX_FLAG_ONLY_MONITOR))
 118                 return true;
 119
 120         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 121                 return true;
 122
 123         if (ieee80211_is_ctl(hdr->frame_control) &&
 124             !ieee80211_is_pspoll(hdr->frame_control) &&
 125             !ieee80211_is_back_req(hdr->frame_control))
 126                 return true;
 127
 128         return false;
 129 }
 130
 131 static int
 132 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 133                              struct ieee80211_rx_status *status,
 134                              struct sk_buff *skb)
 135 {
 136         int len;
 137
 138         /* always present fields */
 139         len = sizeof(struct ieee80211_radiotap_header) + 8;
 140
 141         /* allocate extra bitmaps */
 142         if (status->chains)
 143                 len += 4 * hweight8(status->chains);
 144
 145         if (ieee80211_have_rx_timestamp(status)) {
 146                 len = ALIGN(len, 8);
 147                 len += 8;
 148         }
 149         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 150                 len += 1;
 151
 152         /* antenna field, if we don't have per-chain info */
 153         if (!status->chains)
 154                 len += 1;
 155
 156         /* padding for RX_FLAGS if necessary */
 157         len = ALIGN(len, 2);
 158
 159         if (status->encoding == RX_ENC_HT) /* HT info */
 160                 len += 3;
 161
 162         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 163                 len = ALIGN(len, 4);
 164                 len += 8;
 165         }
 166
 167         if (status->encoding == RX_ENC_VHT) {
 168                 len = ALIGN(len, 2);
 169                 len += 12;
 170         }
 171
 172         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 173                 len = ALIGN(len, 8);
 174                 len += 12;
 175         }
 176
 177         if (status->chains) {
 178                 /* antenna and antenna signal fields */
 179                 len += 2 * hweight8(status->chains);
 180         }
 181
 182         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 183                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 184
 185                 /* vendor presence bitmap */
 186                 len += 4;
 187                 /* alignment for fixed 6-byte vendor data header */
 188                 len = ALIGN(len, 2);
 189                 /* vendor data header */
 190                 len += 6;
 191                 if (WARN_ON(rtap->align == 0))
 192                         rtap->align = 1;
 193                 len = ALIGN(len, rtap->align);
 194                 len += rtap->len + rtap->pad;
 195         }
 196
 197         return len;
 198 }
 199
 200 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 201                                          struct sk_buff *skb,
 202                                          int rtap_vendor_space)
 203 {
 204         struct {
 205                 struct ieee80211_hdr_3addr hdr;
 206                 u8 category;
 207                 u8 action_code;
 208         } __packed action;
 209
 210         if (!sdata)
 211                 return;
 212
 213         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 214
 215         if (skb->len < rtap_vendor_space + sizeof(action) +
 216                        VHT_MUMIMO_GROUPS_DATA_LEN)
 217                 return;
 218
 219         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 220                 return;
 221
 222         skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
 223
 224         if (!ieee80211_is_action(action.hdr.frame_control))
 225                 return;
 226
 227         if (action.category != WLAN_CATEGORY_VHT)
 228                 return;
 229
 230         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 231                 return;
 232
 233         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 234                 return;
 235
 236         skb = skb_copy(skb, GFP_ATOMIC);
 237         if (!skb)
 238                 return;
 239
 240         skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
 241         skb_queue_tail(&sdata->skb_queue, skb);
 242         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 243 }
 244
 245 /*
 246  * ieee80211_add_rx_radiotap_header - add radiotap header
 247  *
 248  * add a radiotap header containing all the fields which the hardware provided.
 249  */
 250 static void
 251 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 252                                  struct sk_buff *skb,
 253                                  struct ieee80211_rate *rate,
 254                                  int rtap_len, bool has_fcs)
 255 {
 256         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 257         struct ieee80211_radiotap_header *rthdr;
 258         unsigned char *pos;
 259         __le32 *it_present;
 260         u32 it_present_val;
 261         u16 rx_flags = 0;
 262         u16 channel_flags = 0;
 263         int mpdulen, chain;
 264         unsigned long chains = status->chains;
 265         struct ieee80211_vendor_radiotap rtap = {};
 266
 267         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 268                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 269                 /* rtap.len and rtap.pad are undone immediately */
 270                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 271         }
 272
 273         mpdulen = skb->len;
 274         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 275                 mpdulen += FCS_LEN;
 276
 277         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
 278         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 279         it_present = &rthdr->it_present;
 280
 281         /* radiotap header, set always present flags */
 282         rthdr->it_len = cpu_to_le16(rtap_len);
 283         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 284                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 285                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 286
 287         if (!status->chains)
 288                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 289
 290         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 291                 it_present_val |=
 292                         BIT(IEEE80211_RADIOTAP_EXT) |
 293                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 294                 put_unaligned_le32(it_present_val, it_present);
 295                 it_present++;
 296                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 297                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 298         }
 299
 300         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 301                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 302                                   BIT(IEEE80211_RADIOTAP_EXT);
 303                 put_unaligned_le32(it_present_val, it_present);
 304                 it_present++;
 305                 it_present_val = rtap.present;
 306         }
 307
 308         put_unaligned_le32(it_present_val, it_present);
 309
 310         pos = (void *)(it_present + 1);
 311
 312         /* the order of the following fields is important */
 313
 314         /* IEEE80211_RADIOTAP_TSFT */
 315         if (ieee80211_have_rx_timestamp(status)) {
 316                 /* padding */
 317                 while ((pos - (u8 *)rthdr) & 7)
 318                         *pos++ = 0;
 319                 put_unaligned_le64(
 320                         ieee80211_calculate_rx_timestamp(local, status,
 321                                                          mpdulen, 0),
 322                         pos);
 323                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 324                 pos += 8;
 325         }
 326
 327         /* IEEE80211_RADIOTAP_FLAGS */
 328         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 329                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 330         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 331                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 332         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 333                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 334         pos++;
 335
 336         /* IEEE80211_RADIOTAP_RATE */
 337         if (!rate || status->encoding != RX_ENC_LEGACY) {
 338                 /*
 339                  * Without rate information don't add it. If we have,
 340                  * MCS information is a separate field in radiotap,
 341                  * added below. The byte here is needed as padding
 342                  * for the channel though, so initialise it to 0.
 343                  */
 344                 *pos = 0;
 345         } else {
 346                 int shift = 0;
 347                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 348                 if (status->bw == RATE_INFO_BW_10)
 349                         shift = 1;
 350                 else if (status->bw == RATE_INFO_BW_5)
 351                         shift = 2;
 352                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 353         }
 354         pos++;
 355
 356         /* IEEE80211_RADIOTAP_CHANNEL */
 357         put_unaligned_le16(status->freq, pos);
 358         pos += 2;
 359         if (status->bw == RATE_INFO_BW_10)
 360                 channel_flags |= IEEE80211_CHAN_HALF;
 361         else if (status->bw == RATE_INFO_BW_5)
 362                 channel_flags |= IEEE80211_CHAN_QUARTER;
 363
 364         if (status->band == NL80211_BAND_5GHZ)
 365                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 366         else if (status->encoding != RX_ENC_LEGACY)
 367                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 368         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 369                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 370         else if (rate)
 371                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 372         else
 373                 channel_flags |= IEEE80211_CHAN_2GHZ;
 374         put_unaligned_le16(channel_flags, pos);
 375         pos += 2;
 376
 377         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 378         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 379             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 380                 *pos = status->signal;
 381                 rthdr->it_present |=
 382                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 383                 pos++;
 384         }
 385
 386         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 387
 388         if (!status->chains) {
 389                 /* IEEE80211_RADIOTAP_ANTENNA */
 390                 *pos = status->antenna;
 391                 pos++;
 392         }
 393
 394         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 395
 396         /* IEEE80211_RADIOTAP_RX_FLAGS */
 397         /* ensure 2 byte alignment for the 2 byte field as required */
 398         if ((pos - (u8 *)rthdr) & 1)
 399                 *pos++ = 0;
 400         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 401                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 402         put_unaligned_le16(rx_flags, pos);
 403         pos += 2;
 404
 405         if (status->encoding == RX_ENC_HT) {
 406                 unsigned int stbc;
 407
 408                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 409                 *pos++ = local->hw.radiotap_mcs_details;
 410                 *pos = 0;
 411                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 412                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 413                 if (status->bw == RATE_INFO_BW_40)
 414                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 415                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 416                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 417                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 418                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 419                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 420                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 421                 pos++;
 422                 *pos++ = status->rate_idx;
 423         }
 424
 425         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 426                 u16 flags = 0;
 427
 428                 /* ensure 4 byte alignment */
 429                 while ((pos - (u8 *)rthdr) & 3)
 430                         pos++;
 431                 rthdr->it_present |=
 432                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 433                 put_unaligned_le32(status->ampdu_reference, pos);
 434                 pos += 4;
 435                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 436                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 437                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 438                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 439                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 440                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 441                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 442                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 443                 put_unaligned_le16(flags, pos);
 444                 pos += 2;
 445                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 446                         *pos++ = status->ampdu_delimiter_crc;
 447                 else
 448                         *pos++ = 0;
 449                 *pos++ = 0;
 450         }
 451
 452         if (status->encoding == RX_ENC_VHT) {
 453                 u16 known = local->hw.radiotap_vht_details;
 454
 455                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 456                 put_unaligned_le16(known, pos);
 457                 pos += 2;
 458                 /* flags */
 459                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 460                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 461                 /* in VHT, STBC is binary */
 462                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 463                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 464                 if (status->enc_flags & RX_ENC_FLAG_BF)
 465                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 466                 pos++;
 467                 /* bandwidth */
 468                 switch (status->bw) {
 469                 case RATE_INFO_BW_80:
 470                         *pos++ = 4;
 471                         break;
 472                 case RATE_INFO_BW_160:
 473                         *pos++ = 11;
 474                         break;
 475                 case RATE_INFO_BW_40:
 476                         *pos++ = 1;
 477                         break;
 478                 default:
 479                         *pos++ = 0;
 480                 }
 481                 /* MCS/NSS */
 482                 *pos = (status->rate_idx << 4) | status->nss;
 483                 pos += 4;
 484                 /* coding field */
 485                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 486                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 487                 pos++;
 488                 /* group ID */
 489                 pos++;
 490                 /* partial_aid */
 491                 pos += 2;
 492         }
 493
 494         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 495                 u16 accuracy = 0;
 496                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 497
 498                 rthdr->it_present |=
 499                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 500
 501                 /* ensure 8 byte alignment */
 502                 while ((pos - (u8 *)rthdr) & 7)
 503                         pos++;
 504
 505                 put_unaligned_le64(status->device_timestamp, pos);
 506                 pos += sizeof(u64);
 507
 508                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 509                         accuracy = local->hw.radiotap_timestamp.accuracy;
 510                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 511                 }
 512                 put_unaligned_le16(accuracy, pos);
 513                 pos += sizeof(u16);
 514
 515                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 516                 *pos++ = flags;
 517         }
 518
 519         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 520                 *pos++ = status->chain_signal[chain];
 521                 *pos++ = chain;
 522         }
 523
 524         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 525                 /* ensure 2 byte alignment for the vendor field as required */
 526                 if ((pos - (u8 *)rthdr) & 1)
 527                         *pos++ = 0;
 528                 *pos++ = rtap.oui[0];
 529                 *pos++ = rtap.oui[1];
 530                 *pos++ = rtap.oui[2];
 531                 *pos++ = rtap.subns;
 532                 put_unaligned_le16(rtap.len, pos);
 533                 pos += 2;
 534                 /* align the actual payload as requested */
 535                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 536                         *pos++ = 0;
 537                 /* data (and possible padding) already follows */
 538         }
 539 }
 540
 541 static struct sk_buff *
 542 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 543                            struct sk_buff **origskb,
 544                            struct ieee80211_rate *rate,
 545                            int rtap_vendor_space, bool use_origskb)
 546 {
 547         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 548         int rt_hdrlen, needed_headroom;
 549         struct sk_buff *skb;
 550
 551         /* room for the radiotap header based on driver features */
 552         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 553         needed_headroom = rt_hdrlen - rtap_vendor_space;
 554
 555         if (use_origskb) {
 556                 /* only need to expand headroom if necessary */
 557                 skb = *origskb;
 558                 *origskb = NULL;
 559
 560                 /*
 561                  * This shouldn't trigger often because most devices have an
 562                  * RX header they pull before we get here, and that should
 563                  * be big enough for our radiotap information. We should
 564                  * probably export the length to drivers so that we can have
 565                  * them allocate enough headroom to start with.
 566                  */
 567                 if (skb_headroom(skb) < needed_headroom &&
 568                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 569                         dev_kfree_skb(skb);
 570                         return NULL;
 571                 }
 572         } else {
 573                 /*
 574                  * Need to make a copy and possibly remove radiotap header
 575                  * and FCS from the original.
 576                  */
 577                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 578
 579                 if (!skb)
 580                         return NULL;
 581         }
 582
 583         /* prepend radiotap information */
 584         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 585
 586         skb_reset_mac_header(skb);
 587         skb->ip_summed = CHECKSUM_UNNECESSARY;
 588         skb->pkt_type = PACKET_OTHERHOST;
 589         skb->protocol = htons(ETH_P_802_2);
 590
 591         return skb;
 592 }
 593
 594 /*
 595  * This function copies a received frame to all monitor interfaces and
 596  * returns a cleaned-up SKB that no longer includes the FCS nor the
 597  * radiotap header the driver might have added.
 598  */
 599 static struct sk_buff *
 600 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 601                      struct ieee80211_rate *rate)
 602 {
 603         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 604         struct ieee80211_sub_if_data *sdata;
 605         struct sk_buff *monskb = NULL;
 606         int present_fcs_len = 0;
 607         unsigned int rtap_vendor_space = 0;
 608         struct ieee80211_sub_if_data *monitor_sdata =
 609                 rcu_dereference(local->monitor_sdata);
 610         bool only_monitor = false;
 611
 612         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 613                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 614
 615                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 616         }
 617
 618         /*
 619          * First, we may need to make a copy of the skb because
 620          *  (1) we need to modify it for radiotap (if not present), and
 621          *  (2) the other RX handlers will modify the skb we got.
 622          *
 623          * We don't need to, of course, if we aren't going to return
 624          * the SKB because it has a bad FCS/PLCP checksum.
 625          */
 626
 627         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 628                 if (unlikely(origskb->len <= FCS_LEN)) {
 629                         /* driver bug */
 630                         WARN_ON(1);
 631                         dev_kfree_skb(origskb);
 632                         return NULL;
 633                 }
 634                 present_fcs_len = FCS_LEN;
 635         }
 636
 637         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 638         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 639                 dev_kfree_skb(origskb);
 640                 return NULL;
 641         }
 642
 643         only_monitor = should_drop_frame(origskb, present_fcs_len,
 644                                          rtap_vendor_space);
 645
 646         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 647                 if (only_monitor) {
 648                         dev_kfree_skb(origskb);
 649                         return NULL;
 650                 }
 651
 652                 remove_monitor_info(origskb, present_fcs_len,
 653                                     rtap_vendor_space);
 654                 return origskb;
 655         }
 656
 657         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
 658
 659         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 660                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 661                                                  &local->mon_list);
 662
 663                 if (!monskb)
 664                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 665                                                             rate,
 666                                                             rtap_vendor_space,
 667                                                             only_monitor &&
 668                                                             last_monitor);
 669
 670                 if (monskb) {
 671                         struct sk_buff *skb;
 672
 673                         if (last_monitor) {
 674                                 skb = monskb;
 675                                 monskb = NULL;
 676                         } else {
 677                                 skb = skb_clone(monskb, GFP_ATOMIC);
 678                         }
 679
 680                         if (skb) {
 681                                 skb->dev = sdata->dev;
 682                                 ieee80211_rx_stats(skb->dev, skb->len);
 683                                 netif_receive_skb(skb);
 684                         }
 685                 }
 686
 687                 if (last_monitor)
 688                         break;
 689         }
 690
 691         /* this happens if last_monitor was erroneously false */
 692         dev_kfree_skb(monskb);
 693
 694         /* ditto */
 695         if (!origskb)
 696                 return NULL;
 697
 698         remove_monitor_info(origskb, present_fcs_len, rtap_vendor_space);
 699         return origskb;
 700 }
 701
 702 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 703 {
 704         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 705         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 706         int tid, seqno_idx, security_idx;
 707
 708         /* does the frame have a qos control field? */
 709         if (ieee80211_is_data_qos(hdr->frame_control)) {
 710                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 711                 /* frame has qos control */
 712                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 713                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 714                         status->rx_flags |= IEEE80211_RX_AMSDU;
 715
 716                 seqno_idx = tid;
 717                 security_idx = tid;
 718         } else {
 719                 /*
 720                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 721                  *
 722                  *      Sequence numbers for management frames, QoS data
 723                  *      frames with a broadcast/multicast address in the
 724                  *      Address 1 field, and all non-QoS data frames sent
 725                  *      by QoS STAs are assigned using an additional single
 726                  *      modulo-4096 counter, [...]
 727                  *
 728                  * We also use that counter for non-QoS STAs.
 729                  */
 730                 seqno_idx = IEEE80211_NUM_TIDS;
 731                 security_idx = 0;
 732                 if (ieee80211_is_mgmt(hdr->frame_control))
 733                         security_idx = IEEE80211_NUM_TIDS;
 734                 tid = 0;
 735         }
 736
 737         rx->seqno_idx = seqno_idx;
 738         rx->security_idx = security_idx;
 739         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 740          * For now, set skb->priority to 0 for other cases. */
 741         rx->skb->priority = (tid > 7) ? 0 : tid;
 742 }
 743
 744 /**
 745  * DOC: Packet alignment
 746  *
 747  * Drivers always need to pass packets that are aligned to two-byte boundaries
 748  * to the stack.
 749  *
 750  * Additionally, should, if possible, align the payload data in a way that
 751  * guarantees that the contained IP header is aligned to a four-byte
 752  * boundary. In the case of regular frames, this simply means aligning the
 753  * payload to a four-byte boundary (because either the IP header is directly
 754  * contained, or IV/RFC1042 headers that have a length divisible by four are
 755  * in front of it).  If the payload data is not properly aligned and the
 756  * architecture doesn't support efficient unaligned operations, mac80211
 757  * will align the data.
 758  *
 759  * With A-MSDU frames, however, the payload data address must yield two modulo
 760  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 761  * push the IP header further back to a multiple of four again. Thankfully, the
 762  * specs were sane enough this time around to require padding each A-MSDU
 763  * subframe to a length that is a multiple of four.
 764  *
 765  * Padding like Atheros hardware adds which is between the 802.11 header and
 766  * the payload is not supported, the driver is required to move the 802.11
 767  * header to be directly in front of the payload in that case.
 768  */
 769 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 770 {
 771 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 772         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 773 #endif
 774 }
 775
 776
 777 /* rx handlers */
 778
 779 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 780 {
 781         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 782
 783         if (is_multicast_ether_addr(hdr->addr1))
 784                 return 0;
 785
 786         return ieee80211_is_robust_mgmt_frame(skb);
 787 }
 788
 789
 790 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 791 {
 792         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 793
 794         if (!is_multicast_ether_addr(hdr->addr1))
 795                 return 0;
 796
 797         return ieee80211_is_robust_mgmt_frame(skb);
 798 }
 799
 800
 801 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 802 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 803 {
 804         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 805         struct ieee80211_mmie *mmie;
 806         struct ieee80211_mmie_16 *mmie16;
 807
 808         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 809                 return -1;
 810
 811         if (!ieee80211_is_robust_mgmt_frame(skb))
 812                 return -1; /* not a robust management frame */
 813
 814         mmie = (struct ieee80211_mmie *)
 815                 (skb->data + skb->len - sizeof(*mmie));
 816         if (mmie->element_id == WLAN_EID_MMIE &&
 817             mmie->length == sizeof(*mmie) - 2)
 818                 return le16_to_cpu(mmie->key_id);
 819
 820         mmie16 = (struct ieee80211_mmie_16 *)
 821                 (skb->data + skb->len - sizeof(*mmie16));
 822         if (skb->len >= 24 + sizeof(*mmie16) &&
 823             mmie16->element_id == WLAN_EID_MMIE &&
 824             mmie16->length == sizeof(*mmie16) - 2)
 825                 return le16_to_cpu(mmie16->key_id);
 826
 827         return -1;
 828 }
 829
 830 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 831                                   struct sk_buff *skb)
 832 {
 833         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 834         __le16 fc;
 835         int hdrlen;
 836         u8 keyid;
 837
 838         fc = hdr->frame_control;
 839         hdrlen = ieee80211_hdrlen(fc);
 840
 841         if (skb->len < hdrlen + cs->hdr_len)
 842                 return -EINVAL;
 843
 844         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 845         keyid &= cs->key_idx_mask;
 846         keyid >>= cs->key_idx_shift;
 847
 848         return keyid;
 849 }
 850
 851 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 852 {
 853         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 854         char *dev_addr = rx->sdata->vif.addr;
 855
 856         if (ieee80211_is_data(hdr->frame_control)) {
 857                 if (is_multicast_ether_addr(hdr->addr1)) {
 858                         if (ieee80211_has_tods(hdr->frame_control) ||
 859                             !ieee80211_has_fromds(hdr->frame_control))
 860                                 return RX_DROP_MONITOR;
 861                         if (ether_addr_equal(hdr->addr3, dev_addr))
 862                                 return RX_DROP_MONITOR;
 863                 } else {
 864                         if (!ieee80211_has_a4(hdr->frame_control))
 865                                 return RX_DROP_MONITOR;
 866                         if (ether_addr_equal(hdr->addr4, dev_addr))
 867                                 return RX_DROP_MONITOR;
 868                 }
 869         }
 870
 871         /* If there is not an established peer link and this is not a peer link
 872          * establisment frame, beacon or probe, drop the frame.
 873          */
 874
 875         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 876                 struct ieee80211_mgmt *mgmt;
 877
 878                 if (!ieee80211_is_mgmt(hdr->frame_control))
 879                         return RX_DROP_MONITOR;
 880
 881                 if (ieee80211_is_action(hdr->frame_control)) {
 882                         u8 category;
 883
 884                         /* make sure category field is present */
 885                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 886                                 return RX_DROP_MONITOR;
 887
 888                         mgmt = (struct ieee80211_mgmt *)hdr;
 889                         category = mgmt->u.action.category;
 890                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 891                             category != WLAN_CATEGORY_SELF_PROTECTED)
 892                                 return RX_DROP_MONITOR;
 893                         return RX_CONTINUE;
 894                 }
 895
 896                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 897                     ieee80211_is_probe_resp(hdr->frame_control) ||
 898                     ieee80211_is_beacon(hdr->frame_control) ||
 899                     ieee80211_is_auth(hdr->frame_control))
 900                         return RX_CONTINUE;
 901
 902                 return RX_DROP_MONITOR;
 903         }
 904
 905         return RX_CONTINUE;
 906 }
 907
 908 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 909                                               int index)
 910 {
 911         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 912         struct sk_buff *tail = skb_peek_tail(frames);
 913         struct ieee80211_rx_status *status;
 914
 915         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 916                 return true;
 917
 918         if (!tail)
 919                 return false;
 920
 921         status = IEEE80211_SKB_RXCB(tail);
 922         if (status->flag & RX_FLAG_AMSDU_MORE)
 923                 return false;
 924
 925         return true;
 926 }
 927
 928 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 929                                             struct tid_ampdu_rx *tid_agg_rx,
 930                                             int index,
 931                                             struct sk_buff_head *frames)
 932 {
 933         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 934         struct sk_buff *skb;
 935         struct ieee80211_rx_status *status;
 936
 937         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 938
 939         if (skb_queue_empty(skb_list))
 940                 goto no_frame;
 941
 942         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 943                 __skb_queue_purge(skb_list);
 944                 goto no_frame;
 945         }
 946
 947         /* release frames from the reorder ring buffer */
 948         tid_agg_rx->stored_mpdu_num--;
 949         while ((skb = __skb_dequeue(skb_list))) {
 950                 status = IEEE80211_SKB_RXCB(skb);
 951                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 952                 __skb_queue_tail(frames, skb);
 953         }
 954
 955 no_frame:
 956         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 957         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 958 }
 959
 960 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 961                                              struct tid_ampdu_rx *tid_agg_rx,
 962                                              u16 head_seq_num,
 963                                              struct sk_buff_head *frames)
 964 {
 965         int index;
 966
 967         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 968
 969         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 970                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 971                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 972                                                 frames);
 973         }
 974 }
 975
 976 /*
 977  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 978  * the skb was added to the buffer longer than this time ago, the earlier
 979  * frames that have not yet been received are assumed to be lost and the skb
 980  * can be released for processing. This may also release other skb's from the
 981  * reorder buffer if there are no additional gaps between the frames.
 982  *
 983  * Callers must hold tid_agg_rx->reorder_lock.
 984  */
 985 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 986
 987 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 988                                           struct tid_ampdu_rx *tid_agg_rx,
 989                                           struct sk_buff_head *frames)
 990 {
 991         int index, i, j;
 992
 993         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 994
 995         /* release the buffer until next missing frame */
 996         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 997         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 998             tid_agg_rx->stored_mpdu_num) {
 999                 /*
1000                  * No buffers ready to be released, but check whether any
1001                  * frames in the reorder buffer have timed out.
1002                  */
1003                 int skipped = 1;
1004                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1005                      j = (j + 1) % tid_agg_rx->buf_size) {
1006                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1007                                 skipped++;
1008                                 continue;
1009                         }
1010                         if (skipped &&
1011                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1012                                         HT_RX_REORDER_BUF_TIMEOUT))
1013                                 goto set_release_timer;
1014
1015                         /* don't leave incomplete A-MSDUs around */
1016                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1017                              i = (i + 1) % tid_agg_rx->buf_size)
1018                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1019
1020                         ht_dbg_ratelimited(sdata,
1021                                            "release an RX reorder frame due to timeout on earlier frames\n");
1022                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1023                                                         frames);
1024
1025                         /*
1026                          * Increment the head seq# also for the skipped slots.
1027                          */
1028                         tid_agg_rx->head_seq_num =
1029                                 (tid_agg_rx->head_seq_num +
1030                                  skipped) & IEEE80211_SN_MASK;
1031                         skipped = 0;
1032                 }
1033         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1034                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1035                                                 frames);
1036                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1037         }
1038
1039         if (tid_agg_rx->stored_mpdu_num) {
1040                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1041
1042                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1043                      j = (j + 1) % tid_agg_rx->buf_size) {
1044                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1045                                 break;
1046                 }
1047
1048  set_release_timer:
1049
1050                 if (!tid_agg_rx->removed)
1051                         mod_timer(&tid_agg_rx->reorder_timer,
1052                                   tid_agg_rx->reorder_time[j] + 1 +
1053                                   HT_RX_REORDER_BUF_TIMEOUT);
1054         } else {
1055                 del_timer(&tid_agg_rx->reorder_timer);
1056         }
1057 }
1058
1059 /*
1060  * As this function belongs to the RX path it must be under
1061  * rcu_read_lock protection. It returns false if the frame
1062  * can be processed immediately, true if it was consumed.
1063  */
1064 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1065                                              struct tid_ampdu_rx *tid_agg_rx,
1066                                              struct sk_buff *skb,
1067                                              struct sk_buff_head *frames)
1068 {
1069         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1070         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1071         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1072         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1073         u16 head_seq_num, buf_size;
1074         int index;
1075         bool ret = true;
1076
1077         spin_lock(&tid_agg_rx->reorder_lock);
1078
1079         /*
1080          * Offloaded BA sessions have no known starting sequence number so pick
1081          * one from first Rxed frame for this tid after BA was started.
1082          */
1083         if (unlikely(tid_agg_rx->auto_seq)) {
1084                 tid_agg_rx->auto_seq = false;
1085                 tid_agg_rx->ssn = mpdu_seq_num;
1086                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1087         }
1088
1089         buf_size = tid_agg_rx->buf_size;
1090         head_seq_num = tid_agg_rx->head_seq_num;
1091
1092         /*
1093          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1094          * be reordered.
1095          */
1096         if (unlikely(!tid_agg_rx->started)) {
1097                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1098                         ret = false;
1099                         goto out;
1100                 }
1101                 tid_agg_rx->started = true;
1102         }
1103
1104         /* frame with out of date sequence number */
1105         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1106                 dev_kfree_skb(skb);
1107                 goto out;
1108         }
1109
1110         /*
1111          * If frame the sequence number exceeds our buffering window
1112          * size release some previous frames to make room for this one.
1113          */
1114         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1115                 head_seq_num = ieee80211_sn_inc(
1116                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1117                 /* release stored frames up to new head to stack */
1118                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1119                                                  head_seq_num, frames);
1120         }
1121
1122         /* Now the new frame is always in the range of the reordering buffer */
1123
1124         index = mpdu_seq_num % tid_agg_rx->buf_size;
1125
1126         /* check if we already stored this frame */
1127         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1128                 dev_kfree_skb(skb);
1129                 goto out;
1130         }
1131
1132         /*
1133          * If the current MPDU is in the right order and nothing else
1134          * is stored we can process it directly, no need to buffer it.
1135          * If it is first but there's something stored, we may be able
1136          * to release frames after this one.
1137          */
1138         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1139             tid_agg_rx->stored_mpdu_num == 0) {
1140                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1141                         tid_agg_rx->head_seq_num =
1142                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1143                 ret = false;
1144                 goto out;
1145         }
1146
1147         /* put the frame in the reordering buffer */
1148         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1149         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1150                 tid_agg_rx->reorder_time[index] = jiffies;
1151                 tid_agg_rx->stored_mpdu_num++;
1152                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1153         }
1154
1155  out:
1156         spin_unlock(&tid_agg_rx->reorder_lock);
1157         return ret;
1158 }
1159
1160 /*
1161  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1162  * true if the MPDU was buffered, false if it should be processed.
1163  */
1164 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1165                                        struct sk_buff_head *frames)
1166 {
1167         struct sk_buff *skb = rx->skb;
1168         struct ieee80211_local *local = rx->local;
1169         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1170         struct sta_info *sta = rx->sta;
1171         struct tid_ampdu_rx *tid_agg_rx;
1172         u16 sc;
1173         u8 tid, ack_policy;
1174
1175         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1176             is_multicast_ether_addr(hdr->addr1))
1177                 goto dont_reorder;
1178
1179         /*
1180          * filter the QoS data rx stream according to
1181          * STA/TID and check if this STA/TID is on aggregation
1182          */
1183
1184         if (!sta)
1185                 goto dont_reorder;
1186
1187         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1188                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1189         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1190
1191         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1192         if (!tid_agg_rx) {
1193                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1194                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1195                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1196                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1197                                              WLAN_BACK_RECIPIENT,
1198                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1199                 goto dont_reorder;
1200         }
1201
1202         /* qos null data frames are excluded */
1203         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1204                 goto dont_reorder;
1205
1206         /* not part of a BA session */
1207         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1208             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1209                 goto dont_reorder;
1210
1211         /* new, potentially un-ordered, ampdu frame - process it */
1212
1213         /* reset session timer */
1214         if (tid_agg_rx->timeout)
1215                 tid_agg_rx->last_rx = jiffies;
1216
1217         /* if this mpdu is fragmented - terminate rx aggregation session */
1218         sc = le16_to_cpu(hdr->seq_ctrl);
1219         if (sc & IEEE80211_SCTL_FRAG) {
1220                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1221                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1222                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1223                 return;
1224         }
1225
1226         /*
1227          * No locking needed -- we will only ever process one
1228          * RX packet at a time, and thus own tid_agg_rx. All
1229          * other code manipulating it needs to (and does) make
1230          * sure that we cannot get to it any more before doing
1231          * anything with it.
1232          */
1233         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1234                                              frames))
1235                 return;
1236
1237  dont_reorder:
1238         __skb_queue_tail(frames, skb);
1239 }
1240
1241 static ieee80211_rx_result debug_noinline
1242 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1243 {
1244         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1245         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1246
1247         if (status->flag & RX_FLAG_DUP_VALIDATED)
1248                 return RX_CONTINUE;
1249
1250         /*
1251          * Drop duplicate 802.11 retransmissions
1252          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1253          */
1254
1255         if (rx->skb->len < 24)
1256                 return RX_CONTINUE;
1257
1258         if (ieee80211_is_ctl(hdr->frame_control) ||
1259             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1260             is_multicast_ether_addr(hdr->addr1))
1261                 return RX_CONTINUE;
1262
1263         if (!rx->sta)
1264                 return RX_CONTINUE;
1265
1266         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1267                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1268                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1269                 rx->sta->rx_stats.num_duplicates++;
1270                 return RX_DROP_UNUSABLE;
1271         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1272                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1273         }
1274
1275         return RX_CONTINUE;
1276 }
1277
1278 static ieee80211_rx_result debug_noinline
1279 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1280 {
1281         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1282
1283         /* Drop disallowed frame classes based on STA auth/assoc state;
1284          * IEEE 802.11, Chap 5.5.
1285          *
1286          * mac80211 filters only based on association state, i.e. it drops
1287          * Class 3 frames from not associated stations. hostapd sends
1288          * deauth/disassoc frames when needed. In addition, hostapd is
1289          * responsible for filtering on both auth and assoc states.
1290          */
1291
1292         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1293                 return ieee80211_rx_mesh_check(rx);
1294
1295         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1296                       ieee80211_is_pspoll(hdr->frame_control)) &&
1297                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1298                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1299                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1300                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1301                 /*
1302                  * accept port control frames from the AP even when it's not
1303                  * yet marked ASSOC to prevent a race where we don't set the
1304                  * assoc bit quickly enough before it sends the first frame
1305                  */
1306                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1307                     ieee80211_is_data_present(hdr->frame_control)) {
1308                         unsigned int hdrlen;
1309                         __be16 ethertype;
1310
1311                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1312
1313                         if (rx->skb->len < hdrlen + 8)
1314                                 return RX_DROP_MONITOR;
1315
1316                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1317                         if (ethertype == rx->sdata->control_port_protocol)
1318                                 return RX_CONTINUE;
1319                 }
1320
1321                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1322                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1323                                                hdr->addr2,
1324                                                GFP_ATOMIC))
1325                         return RX_DROP_UNUSABLE;
1326
1327                 return RX_DROP_MONITOR;
1328         }
1329
1330         return RX_CONTINUE;
1331 }
1332
1333
1334 static ieee80211_rx_result debug_noinline
1335 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1336 {
1337         struct ieee80211_local *local;
1338         struct ieee80211_hdr *hdr;
1339         struct sk_buff *skb;
1340
1341         local = rx->local;
1342         skb = rx->skb;
1343         hdr = (struct ieee80211_hdr *) skb->data;
1344
1345         if (!local->pspolling)
1346                 return RX_CONTINUE;
1347
1348         if (!ieee80211_has_fromds(hdr->frame_control))
1349                 /* this is not from AP */
1350                 return RX_CONTINUE;
1351
1352         if (!ieee80211_is_data(hdr->frame_control))
1353                 return RX_CONTINUE;
1354
1355         if (!ieee80211_has_moredata(hdr->frame_control)) {
1356                 /* AP has no more frames buffered for us */
1357                 local->pspolling = false;
1358                 return RX_CONTINUE;
1359         }
1360
1361         /* more data bit is set, let's request a new frame from the AP */
1362         ieee80211_send_pspoll(local, rx->sdata);
1363
1364         return RX_CONTINUE;
1365 }
1366
1367 static void sta_ps_start(struct sta_info *sta)
1368 {
1369         struct ieee80211_sub_if_data *sdata = sta->sdata;
1370         struct ieee80211_local *local = sdata->local;
1371         struct ps_data *ps;
1372         int tid;
1373
1374         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1375             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1376                 ps = &sdata->bss->ps;
1377         else
1378                 return;
1379
1380         atomic_inc(&ps->num_sta_ps);
1381         set_sta_flag(sta, WLAN_STA_PS_STA);
1382         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1383                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1384         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1385                sta->sta.addr, sta->sta.aid);
1386
1387         ieee80211_clear_fast_xmit(sta);
1388
1389         if (!sta->sta.txq[0])
1390                 return;
1391
1392         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1393                 if (txq_has_queue(sta->sta.txq[tid]))
1394                         set_bit(tid, &sta->txq_buffered_tids);
1395                 else
1396                         clear_bit(tid, &sta->txq_buffered_tids);
1397         }
1398 }
1399
1400 static void sta_ps_end(struct sta_info *sta)
1401 {
1402         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1403                sta->sta.addr, sta->sta.aid);
1404
1405         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1406                 /*
1407                  * Clear the flag only if the other one is still set
1408                  * so that the TX path won't start TX'ing new frames
1409                  * directly ... In the case that the driver flag isn't
1410                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1411                  */
1412                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1413                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1414                        sta->sta.addr, sta->sta.aid);
1415                 return;
1416         }
1417
1418         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1419         clear_sta_flag(sta, WLAN_STA_PS_STA);
1420         ieee80211_sta_ps_deliver_wakeup(sta);
1421 }
1422
1423 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1424 {
1425         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1426         bool in_ps;
1427
1428         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1429
1430         /* Don't let the same PS state be set twice */
1431         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1432         if ((start && in_ps) || (!start && !in_ps))
1433                 return -EINVAL;
1434
1435         if (start)
1436                 sta_ps_start(sta);
1437         else
1438                 sta_ps_end(sta);
1439
1440         return 0;
1441 }
1442 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1443
1444 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1445 {
1446         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1447
1448         if (test_sta_flag(sta, WLAN_STA_SP))
1449                 return;
1450
1451         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1452                 ieee80211_sta_ps_deliver_poll_response(sta);
1453         else
1454                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1455 }
1456 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1457
1458 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1459 {
1460         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1461         int ac = ieee80211_ac_from_tid(tid);
1462
1463         /*
1464          * If this AC is not trigger-enabled do nothing unless the
1465          * driver is calling us after it already checked.
1466          *
1467          * NB: This could/should check a separate bitmap of trigger-
1468          * enabled queues, but for now we only implement uAPSD w/o
1469          * TSPEC changes to the ACs, so they're always the same.
1470          */
1471         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1472             tid != IEEE80211_NUM_TIDS)
1473                 return;
1474
1475         /* if we are in a service period, do nothing */
1476         if (test_sta_flag(sta, WLAN_STA_SP))
1477                 return;
1478
1479         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1480                 ieee80211_sta_ps_deliver_uapsd(sta);
1481         else
1482                 set_sta_flag(sta, WLAN_STA_UAPSD);
1483 }
1484 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1485
1486 static ieee80211_rx_result debug_noinline
1487 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1488 {
1489         struct ieee80211_sub_if_data *sdata = rx->sdata;
1490         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1491         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1492
1493         if (!rx->sta)
1494                 return RX_CONTINUE;
1495
1496         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1497             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1498                 return RX_CONTINUE;
1499
1500         /*
1501          * The device handles station powersave, so don't do anything about
1502          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1503          * it to mac80211 since they're handled.)
1504          */
1505         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1506                 return RX_CONTINUE;
1507
1508         /*
1509          * Don't do anything if the station isn't already asleep. In
1510          * the uAPSD case, the station will probably be marked asleep,
1511          * in the PS-Poll case the station must be confused ...
1512          */
1513         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1514                 return RX_CONTINUE;
1515
1516         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1517                 ieee80211_sta_pspoll(&rx->sta->sta);
1518
1519                 /* Free PS Poll skb here instead of returning RX_DROP that would
1520                  * count as an dropped frame. */
1521                 dev_kfree_skb(rx->skb);
1522
1523                 return RX_QUEUED;
1524         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1525                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1526                    ieee80211_has_pm(hdr->frame_control) &&
1527                    (ieee80211_is_data_qos(hdr->frame_control) ||
1528                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1529                 u8 tid;
1530
1531                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1532
1533                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1534         }
1535
1536         return RX_CONTINUE;
1537 }
1538
1539 static ieee80211_rx_result debug_noinline
1540 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1541 {
1542         struct sta_info *sta = rx->sta;
1543         struct sk_buff *skb = rx->skb;
1544         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1545         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1546         int i;
1547
1548         if (!sta)
1549                 return RX_CONTINUE;
1550
1551         /*
1552          * Update last_rx only for IBSS packets which are for the current
1553          * BSSID and for station already AUTHORIZED to avoid keeping the
1554          * current IBSS network alive in cases where other STAs start
1555          * using different BSSID. This will also give the station another
1556          * chance to restart the authentication/authorization in case
1557          * something went wrong the first time.
1558          */
1559         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1560                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1561                                                 NL80211_IFTYPE_ADHOC);
1562                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1563                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1564                         sta->rx_stats.last_rx = jiffies;
1565                         if (ieee80211_is_data(hdr->frame_control) &&
1566                             !is_multicast_ether_addr(hdr->addr1))
1567                                 sta->rx_stats.last_rate =
1568                                         sta_stats_encode_rate(status);
1569                 }
1570         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1571                 sta->rx_stats.last_rx = jiffies;
1572         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1573                 /*
1574                  * Mesh beacons will update last_rx when if they are found to
1575                  * match the current local configuration when processed.
1576                  */
1577                 sta->rx_stats.last_rx = jiffies;
1578                 if (ieee80211_is_data(hdr->frame_control))
1579                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1580         }
1581
1582         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1583                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1584
1585         sta->rx_stats.fragments++;
1586
1587         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1588         sta->rx_stats.bytes += rx->skb->len;
1589         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1590
1591         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1592                 sta->rx_stats.last_signal = status->signal;
1593                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1594         }
1595
1596         if (status->chains) {
1597                 sta->rx_stats.chains = status->chains;
1598                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1599                         int signal = status->chain_signal[i];
1600
1601                         if (!(status->chains & BIT(i)))
1602                                 continue;
1603
1604                         sta->rx_stats.chain_signal_last[i] = signal;
1605                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1606                                         -signal);
1607                 }
1608         }
1609
1610         /*
1611          * Change STA power saving mode only at the end of a frame
1612          * exchange sequence.
1613          */
1614         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1615             !ieee80211_has_morefrags(hdr->frame_control) &&
1616             !ieee80211_is_back_req(hdr->frame_control) &&
1617             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1618             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1619              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1620             /*
1621              * PM bit is only checked in frames where it isn't reserved,
1622              * in AP mode it's reserved in non-bufferable management frames
1623              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1624              * BAR frames should be ignored as specified in
1625              * IEEE 802.11-2012 10.2.1.2.
1626              */
1627             (!ieee80211_is_mgmt(hdr->frame_control) ||
1628              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1629                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1630                         if (!ieee80211_has_pm(hdr->frame_control))
1631                                 sta_ps_end(sta);
1632                 } else {
1633                         if (ieee80211_has_pm(hdr->frame_control))
1634                                 sta_ps_start(sta);
1635                 }
1636         }
1637
1638         /* mesh power save support */
1639         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1640                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1641
1642         /*
1643          * Drop (qos-)data::nullfunc frames silently, since they
1644          * are used only to control station power saving mode.
1645          */
1646         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1647             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1648                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1649
1650                 /*
1651                  * If we receive a 4-addr nullfunc frame from a STA
1652                  * that was not moved to a 4-addr STA vlan yet send
1653                  * the event to userspace and for older hostapd drop
1654                  * the frame to the monitor interface.
1655                  */
1656                 if (ieee80211_has_a4(hdr->frame_control) &&
1657                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1658                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1659                       !rx->sdata->u.vlan.sta))) {
1660                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1661                                 cfg80211_rx_unexpected_4addr_frame(
1662                                         rx->sdata->dev, sta->sta.addr,
1663                                         GFP_ATOMIC);
1664                         return RX_DROP_MONITOR;
1665                 }
1666                 /*
1667                  * Update counter and free packet here to avoid
1668                  * counting this as a dropped packed.
1669                  */
1670                 sta->rx_stats.packets++;
1671                 dev_kfree_skb(rx->skb);
1672                 return RX_QUEUED;
1673         }
1674
1675         return RX_CONTINUE;
1676 } /* ieee80211_rx_h_sta_process */
1677
1678 static ieee80211_rx_result debug_noinline
1679 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1680 {
1681         struct sk_buff *skb = rx->skb;
1682         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1683         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1684         int keyidx;
1685         int hdrlen;
1686         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1687         struct ieee80211_key *sta_ptk = NULL;
1688         int mmie_keyidx = -1;
1689         __le16 fc;
1690         const struct ieee80211_cipher_scheme *cs = NULL;
1691
1692         /*
1693          * Key selection 101
1694          *
1695          * There are four types of keys:
1696          *  - GTK (group keys)
1697          *  - IGTK (group keys for management frames)
1698          *  - PTK (pairwise keys)
1699          *  - STK (station-to-station pairwise keys)
1700          *
1701          * When selecting a key, we have to distinguish between multicast
1702          * (including broadcast) and unicast frames, the latter can only
1703          * use PTKs and STKs while the former always use GTKs and IGTKs.
1704          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1705          * unicast frames can also use key indices like GTKs. Hence, if we
1706          * don't have a PTK/STK we check the key index for a WEP key.
1707          *
1708          * Note that in a regular BSS, multicast frames are sent by the
1709          * AP only, associated stations unicast the frame to the AP first
1710          * which then multicasts it on their behalf.
1711          *
1712          * There is also a slight problem in IBSS mode: GTKs are negotiated
1713          * with each station, that is something we don't currently handle.
1714          * The spec seems to expect that one negotiates the same key with
1715          * every station but there's no such requirement; VLANs could be
1716          * possible.
1717          */
1718
1719         /* start without a key */
1720         rx->key = NULL;
1721         fc = hdr->frame_control;
1722
1723         if (rx->sta) {
1724                 int keyid = rx->sta->ptk_idx;
1725
1726                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1727                         cs = rx->sta->cipher_scheme;
1728                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1729                         if (unlikely(keyid < 0))
1730                                 return RX_DROP_UNUSABLE;
1731                 }
1732                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1733         }
1734
1735         if (!ieee80211_has_protected(fc))
1736                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1737
1738         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1739                 rx->key = sta_ptk;
1740                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1741                     (status->flag & RX_FLAG_IV_STRIPPED))
1742                         return RX_CONTINUE;
1743                 /* Skip decryption if the frame is not protected. */
1744                 if (!ieee80211_has_protected(fc))
1745                         return RX_CONTINUE;
1746         } else if (mmie_keyidx >= 0) {
1747                 /* Broadcast/multicast robust management frame / BIP */
1748                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1749                     (status->flag & RX_FLAG_IV_STRIPPED))
1750                         return RX_CONTINUE;
1751
1752                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1753                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1754                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1755                 if (rx->sta) {
1756                         if (ieee80211_is_group_privacy_action(skb) &&
1757                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1758                                 return RX_DROP_MONITOR;
1759
1760                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1761                 }
1762                 if (!rx->key)
1763                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1764         } else if (!ieee80211_has_protected(fc)) {
1765                 /*
1766                  * The frame was not protected, so skip decryption. However, we
1767                  * need to set rx->key if there is a key that could have been
1768                  * used so that the frame may be dropped if encryption would
1769                  * have been expected.
1770                  */
1771                 struct ieee80211_key *key = NULL;
1772                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1773                 int i;
1774
1775                 if (ieee80211_is_mgmt(fc) &&
1776                     is_multicast_ether_addr(hdr->addr1) &&
1777                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1778                         rx->key = key;
1779                 else {
1780                         if (rx->sta) {
1781                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1782                                         key = rcu_dereference(rx->sta->gtk[i]);
1783                                         if (key)
1784                                                 break;
1785                                 }
1786                         }
1787                         if (!key) {
1788                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1789                                         key = rcu_dereference(sdata->keys[i]);
1790                                         if (key)
1791                                                 break;
1792                                 }
1793                         }
1794                         if (key)
1795                                 rx->key = key;
1796                 }
1797                 return RX_CONTINUE;
1798         } else {
1799                 u8 keyid;
1800
1801                 /*
1802                  * The device doesn't give us the IV so we won't be
1803                  * able to look up the key. That's ok though, we
1804                  * don't need to decrypt the frame, we just won't
1805                  * be able to keep statistics accurate.
1806                  * Except for key threshold notifications, should
1807                  * we somehow allow the driver to tell us which key
1808                  * the hardware used if this flag is set?
1809                  */
1810                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1811                     (status->flag & RX_FLAG_IV_STRIPPED))
1812                         return RX_CONTINUE;
1813
1814                 hdrlen = ieee80211_hdrlen(fc);
1815
1816                 if (cs) {
1817                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1818
1819                         if (unlikely(keyidx < 0))
1820                                 return RX_DROP_UNUSABLE;
1821                 } else {
1822                         if (rx->skb->len < 8 + hdrlen)
1823                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1824                         /*
1825                          * no need to call ieee80211_wep_get_keyidx,
1826                          * it verifies a bunch of things we've done already
1827                          */
1828                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1829                         keyidx = keyid >> 6;
1830                 }
1831
1832                 /* check per-station GTK first, if multicast packet */
1833                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1834                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1835
1836                 /* if not found, try default key */
1837                 if (!rx->key) {
1838                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1839
1840                         /*
1841                          * RSNA-protected unicast frames should always be
1842                          * sent with pairwise or station-to-station keys,
1843                          * but for WEP we allow using a key index as well.
1844                          */
1845                         if (rx->key &&
1846                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1847                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1848                             !is_multicast_ether_addr(hdr->addr1))
1849                                 rx->key = NULL;
1850                 }
1851         }
1852
1853         if (rx->key) {
1854                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1855                         return RX_DROP_MONITOR;
1856
1857                 /* TODO: add threshold stuff again */
1858         } else {
1859                 return RX_DROP_MONITOR;
1860         }
1861
1862         switch (rx->key->conf.cipher) {
1863         case WLAN_CIPHER_SUITE_WEP40:
1864         case WLAN_CIPHER_SUITE_WEP104:
1865                 result = ieee80211_crypto_wep_decrypt(rx);
1866                 break;
1867         case WLAN_CIPHER_SUITE_TKIP:
1868                 result = ieee80211_crypto_tkip_decrypt(rx);
1869                 break;
1870         case WLAN_CIPHER_SUITE_CCMP:
1871                 result = ieee80211_crypto_ccmp_decrypt(
1872                         rx, IEEE80211_CCMP_MIC_LEN);
1873                 break;
1874         case WLAN_CIPHER_SUITE_CCMP_256:
1875                 result = ieee80211_crypto_ccmp_decrypt(
1876                         rx, IEEE80211_CCMP_256_MIC_LEN);
1877                 break;
1878         case WLAN_CIPHER_SUITE_AES_CMAC:
1879                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1880                 break;
1881         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1882                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1883                 break;
1884         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1885         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1886                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1887                 break;
1888         case WLAN_CIPHER_SUITE_GCMP:
1889         case WLAN_CIPHER_SUITE_GCMP_256:
1890                 result = ieee80211_crypto_gcmp_decrypt(rx);
1891                 break;
1892         default:
1893                 result = ieee80211_crypto_hw_decrypt(rx);
1894         }
1895
1896         /* the hdr variable is invalid after the decrypt handlers */
1897
1898         /* either the frame has been decrypted or will be dropped */
1899         status->flag |= RX_FLAG_DECRYPTED;
1900
1901         return result;
1902 }
1903
1904 static inline struct ieee80211_fragment_entry *
1905 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1906                          unsigned int frag, unsigned int seq, int rx_queue,
1907                          struct sk_buff **skb)
1908 {
1909         struct ieee80211_fragment_entry *entry;
1910
1911         entry = &sdata->fragments[sdata->fragment_next++];
1912         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1913                 sdata->fragment_next = 0;
1914
1915         if (!skb_queue_empty(&entry->skb_list))
1916                 __skb_queue_purge(&entry->skb_list);
1917
1918         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1919         *skb = NULL;
1920         entry->first_frag_time = jiffies;
1921         entry->seq = seq;
1922         entry->rx_queue = rx_queue;
1923         entry->last_frag = frag;
1924         entry->check_sequential_pn = false;
1925         entry->extra_len = 0;
1926
1927         return entry;
1928 }
1929
1930 static inline struct ieee80211_fragment_entry *
1931 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1932                           unsigned int frag, unsigned int seq,
1933                           int rx_queue, struct ieee80211_hdr *hdr)
1934 {
1935         struct ieee80211_fragment_entry *entry;
1936         int i, idx;
1937
1938         idx = sdata->fragment_next;
1939         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1940                 struct ieee80211_hdr *f_hdr;
1941
1942                 idx--;
1943                 if (idx < 0)
1944                         idx = IEEE80211_FRAGMENT_MAX - 1;
1945
1946                 entry = &sdata->fragments[idx];
1947                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1948                     entry->rx_queue != rx_queue ||
1949                     entry->last_frag + 1 != frag)
1950                         continue;
1951
1952                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1953
1954                 /*
1955                  * Check ftype and addresses are equal, else check next fragment
1956                  */
1957                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1958                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1959                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1960                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1961                         continue;
1962
1963                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1964                         __skb_queue_purge(&entry->skb_list);
1965                         continue;
1966                 }
1967                 return entry;
1968         }
1969
1970         return NULL;
1971 }
1972
1973 static ieee80211_rx_result debug_noinline
1974 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1975 {
1976         struct ieee80211_hdr *hdr;
1977         u16 sc;
1978         __le16 fc;
1979         unsigned int frag, seq;
1980         struct ieee80211_fragment_entry *entry;
1981         struct sk_buff *skb;
1982
1983         hdr = (struct ieee80211_hdr *)rx->skb->data;
1984         fc = hdr->frame_control;
1985
1986         if (ieee80211_is_ctl(fc))
1987                 return RX_CONTINUE;
1988
1989         sc = le16_to_cpu(hdr->seq_ctrl);
1990         frag = sc & IEEE80211_SCTL_FRAG;
1991
1992         if (is_multicast_ether_addr(hdr->addr1)) {
1993                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1994                 goto out_no_led;
1995         }
1996
1997         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1998                 goto out;
1999
2000         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2001
2002         if (skb_linearize(rx->skb))
2003                 return RX_DROP_UNUSABLE;
2004
2005         /*
2006          *  skb_linearize() might change the skb->data and
2007          *  previously cached variables (in this case, hdr) need to
2008          *  be refreshed with the new data.
2009          */
2010         hdr = (struct ieee80211_hdr *)rx->skb->data;
2011         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2012
2013         if (frag == 0) {
2014                 /* This is the first fragment of a new frame. */
2015                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2016                                                  rx->seqno_idx, &(rx->skb));
2017                 if (rx->key &&
2018                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2019                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2020                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2021                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2022                     ieee80211_has_protected(fc)) {
2023                         int queue = rx->security_idx;
2024
2025                         /* Store CCMP/GCMP PN so that we can verify that the
2026                          * next fragment has a sequential PN value.
2027                          */
2028                         entry->check_sequential_pn = true;
2029                         memcpy(entry->last_pn,
2030                                rx->key->u.ccmp.rx_pn[queue],
2031                                IEEE80211_CCMP_PN_LEN);
2032                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2033                                               u.ccmp.rx_pn) !=
2034                                      offsetof(struct ieee80211_key,
2035                                               u.gcmp.rx_pn));
2036                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2037                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2038                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2039                                      IEEE80211_GCMP_PN_LEN);
2040                 }
2041                 return RX_QUEUED;
2042         }
2043
2044         /* This is a fragment for a frame that should already be pending in
2045          * fragment cache. Add this fragment to the end of the pending entry.
2046          */
2047         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2048                                           rx->seqno_idx, hdr);
2049         if (!entry) {
2050                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2051                 return RX_DROP_MONITOR;
2052         }
2053
2054         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2055          *  MPDU PN values are not incrementing in steps of 1."
2056          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2057          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2058          */
2059         if (entry->check_sequential_pn) {
2060                 int i;
2061                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2062                 int queue;
2063
2064                 if (!rx->key ||
2065                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2066                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2067                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2068                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2069                         return RX_DROP_UNUSABLE;
2070                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2071                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2072                         pn[i]++;
2073                         if (pn[i])
2074                                 break;
2075                 }
2076                 queue = rx->security_idx;
2077                 rpn = rx->key->u.ccmp.rx_pn[queue];
2078                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2079                         return RX_DROP_UNUSABLE;
2080                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2081         }
2082
2083         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2084         __skb_queue_tail(&entry->skb_list, rx->skb);
2085         entry->last_frag = frag;
2086         entry->extra_len += rx->skb->len;
2087         if (ieee80211_has_morefrags(fc)) {
2088                 rx->skb = NULL;
2089                 return RX_QUEUED;
2090         }
2091
2092         rx->skb = __skb_dequeue(&entry->skb_list);
2093         if (skb_tailroom(rx->skb) < entry->extra_len) {
2094                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2095                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2096                                               GFP_ATOMIC))) {
2097                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2098                         __skb_queue_purge(&entry->skb_list);
2099                         return RX_DROP_UNUSABLE;
2100                 }
2101         }
2102         while ((skb = __skb_dequeue(&entry->skb_list))) {
2103                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2104                 dev_kfree_skb(skb);
2105         }
2106
2107  out:
2108         ieee80211_led_rx(rx->local);
2109  out_no_led:
2110         if (rx->sta)
2111                 rx->sta->rx_stats.packets++;
2112         return RX_CONTINUE;
2113 }
2114
2115 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2116 {
2117         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2118                 return -EACCES;
2119
2120         return 0;
2121 }
2122
2123 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2124 {
2125         struct sk_buff *skb = rx->skb;
2126         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2127
2128         /*
2129          * Pass through unencrypted frames if the hardware has
2130          * decrypted them already.
2131          */
2132         if (status->flag & RX_FLAG_DECRYPTED)
2133                 return 0;
2134
2135         /* Drop unencrypted frames if key is set. */
2136         if (unlikely(!ieee80211_has_protected(fc) &&
2137                      !ieee80211_is_nullfunc(fc) &&
2138                      ieee80211_is_data(fc) && rx->key))
2139                 return -EACCES;
2140
2141         return 0;
2142 }
2143
2144 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2145 {
2146         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2147         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2148         __le16 fc = hdr->frame_control;
2149
2150         /*
2151          * Pass through unencrypted frames if the hardware has
2152          * decrypted them already.
2153          */
2154         if (status->flag & RX_FLAG_DECRYPTED)
2155                 return 0;
2156
2157         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2158                 if (unlikely(!ieee80211_has_protected(fc) &&
2159                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2160                              rx->key)) {
2161                         if (ieee80211_is_deauth(fc) ||
2162                             ieee80211_is_disassoc(fc))
2163                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2164                                                              rx->skb->data,
2165                                                              rx->skb->len);
2166                         return -EACCES;
2167                 }
2168                 /* BIP does not use Protected field, so need to check MMIE */
2169                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2170                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2171                         if (ieee80211_is_deauth(fc) ||
2172                             ieee80211_is_disassoc(fc))
2173                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2174                                                              rx->skb->data,
2175                                                              rx->skb->len);
2176                         return -EACCES;
2177                 }
2178                 /*
2179                  * When using MFP, Action frames are not allowed prior to
2180                  * having configured keys.
2181                  */
2182                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2183                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2184                         return -EACCES;
2185         }
2186
2187         return 0;
2188 }
2189
2190 static int
2191 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2192 {
2193         struct ieee80211_sub_if_data *sdata = rx->sdata;
2194         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2195         bool check_port_control = false;
2196         struct ethhdr *ehdr;
2197         int ret;
2198
2199         *port_control = false;
2200         if (ieee80211_has_a4(hdr->frame_control) &&
2201             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2202                 return -1;
2203
2204         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2205             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2206
2207                 if (!sdata->u.mgd.use_4addr)
2208                         return -1;
2209                 else
2210                         check_port_control = true;
2211         }
2212
2213         if (is_multicast_ether_addr(hdr->addr1) &&
2214             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2215                 return -1;
2216
2217         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2218         if (ret < 0)
2219                 return ret;
2220
2221         ehdr = (struct ethhdr *) rx->skb->data;
2222         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2223                 *port_control = true;
2224         else if (check_port_control)
2225                 return -1;
2226
2227         return 0;
2228 }
2229
2230 /*
2231  * requires that rx->skb is a frame with ethernet header
2232  */
2233 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2234 {
2235         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2236                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2237         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2238
2239         /*
2240          * Allow EAPOL frames to us/the PAE group address regardless
2241          * of whether the frame was encrypted or not.
2242          */
2243         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2244             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2245              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2246                 return true;
2247
2248         if (ieee80211_802_1x_port_control(rx) ||
2249             ieee80211_drop_unencrypted(rx, fc))
2250                 return false;
2251
2252         return true;
2253 }
2254
2255 /*
2256  * requires that rx->skb is a frame with ethernet header
2257  */
2258 static void
2259 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2260 {
2261         struct ieee80211_sub_if_data *sdata = rx->sdata;
2262         struct net_device *dev = sdata->dev;
2263         struct sk_buff *skb, *xmit_skb;
2264         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2265         struct sta_info *dsta;
2266
2267         skb = rx->skb;
2268         xmit_skb = NULL;
2269
2270         ieee80211_rx_stats(dev, skb->len);
2271
2272         if (rx->sta) {
2273                 /* The seqno index has the same property as needed
2274                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2275                  * for non-QoS-data frames. Here we know it's a data
2276                  * frame, so count MSDUs.
2277                  */
2278                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2279                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2280                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2281         }
2282
2283         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2284              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2285             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2286             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2287                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2288                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2289                         /*
2290                          * send multicast frames both to higher layers in
2291                          * local net stack and back to the wireless medium
2292                          */
2293                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2294                         if (!xmit_skb)
2295                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2296                                                     dev->name);
2297                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2298                         dsta = sta_info_get(sdata, skb->data);
2299                         if (dsta) {
2300                                 /*
2301                                  * The destination station is associated to
2302                                  * this AP (in this VLAN), so send the frame
2303                                  * directly to it and do not pass it to local
2304                                  * net stack.
2305                                  */
2306                                 xmit_skb = skb;
2307                                 skb = NULL;
2308                         }
2309                 }
2310         }
2311
2312 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2313         if (skb) {
2314                 /* 'align' will only take the values 0 or 2 here since all
2315                  * frames are required to be aligned to 2-byte boundaries
2316                  * when being passed to mac80211; the code here works just
2317                  * as well if that isn't true, but mac80211 assumes it can
2318                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2319                  */
2320                 int align;
2321
2322                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2323                 if (align) {
2324                         if (WARN_ON(skb_headroom(skb) < 3)) {
2325                                 dev_kfree_skb(skb);
2326                                 skb = NULL;
2327                         } else {
2328                                 u8 *data = skb->data;
2329                                 size_t len = skb_headlen(skb);
2330                                 skb->data -= align;
2331                                 memmove(skb->data, data, len);
2332                                 skb_set_tail_pointer(skb, len);
2333                         }
2334                 }
2335         }
2336 #endif
2337
2338         if (skb) {
2339                 /* deliver to local stack */
2340                 skb->protocol = eth_type_trans(skb, dev);
2341                 memset(skb->cb, 0, sizeof(skb->cb));
2342                 if (rx->napi)
2343                         napi_gro_receive(rx->napi, skb);
2344                 else
2345                         netif_receive_skb(skb);
2346         }
2347
2348         if (xmit_skb) {
2349                 /*
2350                  * Send to wireless media and increase priority by 256 to
2351                  * keep the received priority instead of reclassifying
2352                  * the frame (see cfg80211_classify8021d).
2353                  */
2354                 xmit_skb->priority += 256;
2355                 xmit_skb->protocol = htons(ETH_P_802_3);
2356                 skb_reset_network_header(xmit_skb);
2357                 skb_reset_mac_header(xmit_skb);
2358                 dev_queue_xmit(xmit_skb);
2359         }
2360 }
2361
2362 static ieee80211_rx_result debug_noinline
2363 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2364 {
2365         struct net_device *dev = rx->sdata->dev;
2366         struct sk_buff *skb = rx->skb;
2367         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2368         __le16 fc = hdr->frame_control;
2369         struct sk_buff_head frame_list;
2370         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2371         struct ethhdr ethhdr;
2372         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2373
2374         if (unlikely(!ieee80211_is_data(fc)))
2375                 return RX_CONTINUE;
2376
2377         if (unlikely(!ieee80211_is_data_present(fc)))
2378                 return RX_DROP_MONITOR;
2379
2380         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2381                 return RX_CONTINUE;
2382
2383         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2384                 switch (rx->sdata->vif.type) {
2385                 case NL80211_IFTYPE_AP_VLAN:
2386                         if (!rx->sdata->u.vlan.sta)
2387                                 return RX_DROP_UNUSABLE;
2388                         break;
2389                 case NL80211_IFTYPE_STATION:
2390                         if (!rx->sdata->u.mgd.use_4addr)
2391                                 return RX_DROP_UNUSABLE;
2392                         break;
2393                 default:
2394                         return RX_DROP_UNUSABLE;
2395                 }
2396                 check_da = NULL;
2397                 check_sa = NULL;
2398         } else switch (rx->sdata->vif.type) {
2399                 case NL80211_IFTYPE_AP:
2400                 case NL80211_IFTYPE_AP_VLAN:
2401                         check_da = NULL;
2402                         break;
2403                 case NL80211_IFTYPE_STATION:
2404                         if (!rx->sta ||
2405                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2406                                 check_sa = NULL;
2407                         break;
2408                 case NL80211_IFTYPE_MESH_POINT:
2409                         check_sa = NULL;
2410                         break;
2411                 default:
2412                         break;
2413         }
2414
2415         if (is_multicast_ether_addr(hdr->addr1))
2416                 return RX_DROP_UNUSABLE;
2417
2418         skb->dev = dev;
2419         __skb_queue_head_init(&frame_list);
2420
2421         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2422                                           rx->sdata->vif.addr,
2423                                           rx->sdata->vif.type))
2424                 return RX_DROP_UNUSABLE;
2425
2426         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2427                                  rx->sdata->vif.type,
2428                                  rx->local->hw.extra_tx_headroom,
2429                                  check_da, check_sa);
2430
2431         while (!skb_queue_empty(&frame_list)) {
2432                 rx->skb = __skb_dequeue(&frame_list);
2433
2434                 if (!ieee80211_frame_allowed(rx, fc)) {
2435                         dev_kfree_skb(rx->skb);
2436                         continue;
2437                 }
2438
2439                 ieee80211_deliver_skb(rx);
2440         }
2441
2442         return RX_QUEUED;
2443 }
2444
2445 #ifdef CONFIG_MAC80211_MESH
2446 static ieee80211_rx_result
2447 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2448 {
2449         struct ieee80211_hdr *fwd_hdr, *hdr;
2450         struct ieee80211_tx_info *info;
2451         struct ieee80211s_hdr *mesh_hdr;
2452         struct sk_buff *skb = rx->skb, *fwd_skb;
2453         struct ieee80211_local *local = rx->local;
2454         struct ieee80211_sub_if_data *sdata = rx->sdata;
2455         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2456         u16 ac, q, hdrlen;
2457
2458         hdr = (struct ieee80211_hdr *) skb->data;
2459         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2460
2461         /* make sure fixed part of mesh header is there, also checks skb len */
2462         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2463                 return RX_DROP_MONITOR;
2464
2465         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2466
2467         /* make sure full mesh header is there, also checks skb len */
2468         if (!pskb_may_pull(rx->skb,
2469                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2470                 return RX_DROP_MONITOR;
2471
2472         /* reload pointers */
2473         hdr = (struct ieee80211_hdr *) skb->data;
2474         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2475
2476         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2477                 return RX_DROP_MONITOR;
2478
2479         /* frame is in RMC, don't forward */
2480         if (ieee80211_is_data(hdr->frame_control) &&
2481             is_multicast_ether_addr(hdr->addr1) &&
2482             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2483                 return RX_DROP_MONITOR;
2484
2485         if (!ieee80211_is_data(hdr->frame_control))
2486                 return RX_CONTINUE;
2487
2488         if (!mesh_hdr->ttl)
2489                 return RX_DROP_MONITOR;
2490
2491         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2492                 struct mesh_path *mppath;
2493                 char *proxied_addr;
2494                 char *mpp_addr;
2495
2496                 if (is_multicast_ether_addr(hdr->addr1)) {
2497                         mpp_addr = hdr->addr3;
2498                         proxied_addr = mesh_hdr->eaddr1;
2499                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2500                             MESH_FLAGS_AE_A5_A6) {
2501                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2502                         mpp_addr = hdr->addr4;
2503                         proxied_addr = mesh_hdr->eaddr2;
2504                 } else {
2505                         return RX_DROP_MONITOR;
2506                 }
2507
2508                 rcu_read_lock();
2509                 mppath = mpp_path_lookup(sdata, proxied_addr);
2510                 if (!mppath) {
2511                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2512                 } else {
2513                         spin_lock_bh(&mppath->state_lock);
2514                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2515                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2516                         mppath->exp_time = jiffies;
2517                         spin_unlock_bh(&mppath->state_lock);
2518                 }
2519                 rcu_read_unlock();
2520         }
2521
2522         /* Frame has reached destination.  Don't forward */
2523         if (!is_multicast_ether_addr(hdr->addr1) &&
2524             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2525                 return RX_CONTINUE;
2526
2527         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2528         q = sdata->vif.hw_queue[ac];
2529         if (ieee80211_queue_stopped(&local->hw, q)) {
2530                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2531                 return RX_DROP_MONITOR;
2532         }
2533         skb_set_queue_mapping(skb, q);
2534
2535         if (!--mesh_hdr->ttl) {
2536                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2537                 goto out;
2538         }
2539
2540         if (!ifmsh->mshcfg.dot11MeshForwarding)
2541                 goto out;
2542
2543         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2544                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2545         if (!fwd_skb) {
2546                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2547                                     sdata->name);
2548                 goto out;
2549         }
2550
2551         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2552         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2553         info = IEEE80211_SKB_CB(fwd_skb);
2554         memset(info, 0, sizeof(*info));
2555         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2556         info->control.vif = &rx->sdata->vif;
2557         info->control.jiffies = jiffies;
2558         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2559                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2560                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2561                 /* update power mode indication when forwarding */
2562                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2563         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2564                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2565                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2566         } else {
2567                 /* unable to resolve next hop */
2568                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2569                                    fwd_hdr->addr3, 0,
2570                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2571                                    fwd_hdr->addr2);
2572                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2573                 kfree_skb(fwd_skb);
2574                 return RX_DROP_MONITOR;
2575         }
2576
2577         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2578         ieee80211_add_pending_skb(local, fwd_skb);
2579  out:
2580         if (is_multicast_ether_addr(hdr->addr1))
2581                 return RX_CONTINUE;
2582         return RX_DROP_MONITOR;
2583 }
2584 #endif
2585
2586 static ieee80211_rx_result debug_noinline
2587 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2588 {
2589         struct ieee80211_sub_if_data *sdata = rx->sdata;
2590         struct ieee80211_local *local = rx->local;
2591         struct net_device *dev = sdata->dev;
2592         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2593         __le16 fc = hdr->frame_control;
2594         bool port_control;
2595         int err;
2596
2597         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2598                 return RX_CONTINUE;
2599
2600         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2601                 return RX_DROP_MONITOR;
2602
2603         /*
2604          * Send unexpected-4addr-frame event to hostapd. For older versions,
2605          * also drop the frame to cooked monitor interfaces.
2606          */
2607         if (ieee80211_has_a4(hdr->frame_control) &&
2608             sdata->vif.type == NL80211_IFTYPE_AP) {
2609                 if (rx->sta &&
2610                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2611                         cfg80211_rx_unexpected_4addr_frame(
2612                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2613                 return RX_DROP_MONITOR;
2614         }
2615
2616         err = __ieee80211_data_to_8023(rx, &port_control);
2617         if (unlikely(err))
2618                 return RX_DROP_UNUSABLE;
2619
2620         if (!ieee80211_frame_allowed(rx, fc))
2621                 return RX_DROP_MONITOR;
2622
2623         /* directly handle TDLS channel switch requests/responses */
2624         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2625                                                 cpu_to_be16(ETH_P_TDLS))) {
2626                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2627
2628                 if (pskb_may_pull(rx->skb,
2629                                   offsetof(struct ieee80211_tdls_data, u)) &&
2630                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2631                     tf->category == WLAN_CATEGORY_TDLS &&
2632                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2633                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2634                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2635                         schedule_work(&local->tdls_chsw_work);
2636                         if (rx->sta)
2637                                 rx->sta->rx_stats.packets++;
2638
2639                         return RX_QUEUED;
2640                 }
2641         }
2642
2643         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2644             unlikely(port_control) && sdata->bss) {
2645                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2646                                      u.ap);
2647                 dev = sdata->dev;
2648                 rx->sdata = sdata;
2649         }
2650
2651         rx->skb->dev = dev;
2652
2653         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2654             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2655             !is_multicast_ether_addr(
2656                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2657             (!local->scanning &&
2658              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2659                 mod_timer(&local->dynamic_ps_timer, jiffies +
2660                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2661
2662         ieee80211_deliver_skb(rx);
2663
2664         return RX_QUEUED;
2665 }
2666
2667 static ieee80211_rx_result debug_noinline
2668 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2669 {
2670         struct sk_buff *skb = rx->skb;
2671         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2672         struct tid_ampdu_rx *tid_agg_rx;
2673         u16 start_seq_num;
2674         u16 tid;
2675
2676         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2677                 return RX_CONTINUE;
2678
2679         if (ieee80211_is_back_req(bar->frame_control)) {
2680                 struct {
2681                         __le16 control, start_seq_num;
2682                 } __packed bar_data;
2683                 struct ieee80211_event event = {
2684                         .type = BAR_RX_EVENT,
2685                 };
2686
2687                 if (!rx->sta)
2688                         return RX_DROP_MONITOR;
2689
2690                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2691                                   &bar_data, sizeof(bar_data)))
2692                         return RX_DROP_MONITOR;
2693
2694                 tid = le16_to_cpu(bar_data.control) >> 12;
2695
2696                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2697                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2698                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2699                                              WLAN_BACK_RECIPIENT,
2700                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2701
2702                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2703                 if (!tid_agg_rx)
2704                         return RX_DROP_MONITOR;
2705
2706                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2707                 event.u.ba.tid = tid;
2708                 event.u.ba.ssn = start_seq_num;
2709                 event.u.ba.sta = &rx->sta->sta;
2710
2711                 /* reset session timer */
2712                 if (tid_agg_rx->timeout)
2713                         mod_timer(&tid_agg_rx->session_timer,
2714                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2715
2716                 spin_lock(&tid_agg_rx->reorder_lock);
2717                 /* release stored frames up to start of BAR */
2718                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2719                                                  start_seq_num, frames);
2720                 spin_unlock(&tid_agg_rx->reorder_lock);
2721
2722                 drv_event_callback(rx->local, rx->sdata, &event);
2723
2724                 kfree_skb(skb);
2725                 return RX_QUEUED;
2726         }
2727
2728         /*
2729          * After this point, we only want management frames,
2730          * so we can drop all remaining control frames to
2731          * cooked monitor interfaces.
2732          */
2733         return RX_DROP_MONITOR;
2734 }
2735
2736 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2737                                            struct ieee80211_mgmt *mgmt,
2738                                            size_t len)
2739 {
2740         struct ieee80211_local *local = sdata->local;
2741         struct sk_buff *skb;
2742         struct ieee80211_mgmt *resp;
2743
2744         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2745                 /* Not to own unicast address */
2746                 return;
2747         }
2748
2749         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2750             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2751                 /* Not from the current AP or not associated yet. */
2752                 return;
2753         }
2754
2755         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2756                 /* Too short SA Query request frame */
2757                 return;
2758         }
2759
2760         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2761         if (skb == NULL)
2762                 return;
2763
2764         skb_reserve(skb, local->hw.extra_tx_headroom);
2765         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2766         memset(resp, 0, 24);
2767         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2768         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2769         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2770         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2771                                           IEEE80211_STYPE_ACTION);
2772         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2773         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2774         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2775         memcpy(resp->u.action.u.sa_query.trans_id,
2776                mgmt->u.action.u.sa_query.trans_id,
2777                WLAN_SA_QUERY_TR_ID_LEN);
2778
2779         ieee80211_tx_skb(sdata, skb);
2780 }
2781
2782 static ieee80211_rx_result debug_noinline
2783 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2784 {
2785         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2786         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2787
2788         /*
2789          * From here on, look only at management frames.
2790          * Data and control frames are already handled,
2791          * and unknown (reserved) frames are useless.
2792          */
2793         if (rx->skb->len < 24)
2794                 return RX_DROP_MONITOR;
2795
2796         if (!ieee80211_is_mgmt(mgmt->frame_control))
2797                 return RX_DROP_MONITOR;
2798
2799         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2800             ieee80211_is_beacon(mgmt->frame_control) &&
2801             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2802                 int sig = 0;
2803
2804                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2805                         sig = status->signal;
2806
2807                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2808                                             rx->skb->data, rx->skb->len,
2809                                             status->freq, sig);
2810                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2811         }
2812
2813         if (ieee80211_drop_unencrypted_mgmt(rx))
2814                 return RX_DROP_UNUSABLE;
2815
2816         return RX_CONTINUE;
2817 }
2818
2819 static ieee80211_rx_result debug_noinline
2820 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2821 {
2822         struct ieee80211_local *local = rx->local;
2823         struct ieee80211_sub_if_data *sdata = rx->sdata;
2824         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2825         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2826         int len = rx->skb->len;
2827
2828         if (!ieee80211_is_action(mgmt->frame_control))
2829                 return RX_CONTINUE;
2830
2831         /* drop too small frames */
2832         if (len < IEEE80211_MIN_ACTION_SIZE)
2833                 return RX_DROP_UNUSABLE;
2834
2835         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2836             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2837             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2838                 return RX_DROP_UNUSABLE;
2839
2840         switch (mgmt->u.action.category) {
2841         case WLAN_CATEGORY_HT:
2842                 /* reject HT action frames from stations not supporting HT */
2843                 if (!rx->sta->sta.ht_cap.ht_supported)
2844                         goto invalid;
2845
2846                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2847                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2848                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2849                     sdata->vif.type != NL80211_IFTYPE_AP &&
2850                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2851                         break;
2852
2853                 /* verify action & smps_control/chanwidth are present */
2854                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2855                         goto invalid;
2856
2857                 switch (mgmt->u.action.u.ht_smps.action) {
2858                 case WLAN_HT_ACTION_SMPS: {
2859                         struct ieee80211_supported_band *sband;
2860                         enum ieee80211_smps_mode smps_mode;
2861
2862                         /* convert to HT capability */
2863                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2864                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2865                                 smps_mode = IEEE80211_SMPS_OFF;
2866                                 break;
2867                         case WLAN_HT_SMPS_CONTROL_STATIC:
2868                                 smps_mode = IEEE80211_SMPS_STATIC;
2869                                 break;
2870                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2871                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2872                                 break;
2873                         default:
2874                                 goto invalid;
2875                         }
2876
2877                         /* if no change do nothing */
2878                         if (rx->sta->sta.smps_mode == smps_mode)
2879                                 goto handled;
2880                         rx->sta->sta.smps_mode = smps_mode;
2881
2882                         sband = rx->local->hw.wiphy->bands[status->band];
2883
2884                         rate_control_rate_update(local, sband, rx->sta,
2885                                                  IEEE80211_RC_SMPS_CHANGED);
2886                         goto handled;
2887                 }
2888                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2889                         struct ieee80211_supported_band *sband;
2890                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2891                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2892
2893                         /* If it doesn't support 40 MHz it can't change ... */
2894                         if (!(rx->sta->sta.ht_cap.cap &
2895                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2896                                 goto handled;
2897
2898                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2899                                 max_bw = IEEE80211_STA_RX_BW_20;
2900                         else
2901                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2902
2903                         /* set cur_max_bandwidth and recalc sta bw */
2904                         rx->sta->cur_max_bandwidth = max_bw;
2905                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2906
2907                         if (rx->sta->sta.bandwidth == new_bw)
2908                                 goto handled;
2909
2910                         rx->sta->sta.bandwidth = new_bw;
2911                         sband = rx->local->hw.wiphy->bands[status->band];
2912
2913                         rate_control_rate_update(local, sband, rx->sta,
2914                                                  IEEE80211_RC_BW_CHANGED);
2915                         goto handled;
2916                 }
2917                 default:
2918                         goto invalid;
2919                 }
2920
2921                 break;
2922         case WLAN_CATEGORY_PUBLIC:
2923                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2924                         goto invalid;
2925                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2926                         break;
2927                 if (!rx->sta)
2928                         break;
2929                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2930                         break;
2931                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2932                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2933                         break;
2934                 if (len < offsetof(struct ieee80211_mgmt,
2935                                    u.action.u.ext_chan_switch.variable))
2936                         goto invalid;
2937                 goto queue;
2938         case WLAN_CATEGORY_VHT:
2939                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2940                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2941                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2942                     sdata->vif.type != NL80211_IFTYPE_AP &&
2943                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2944                         break;
2945
2946                 /* verify action code is present */
2947                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2948                         goto invalid;
2949
2950                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2951                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2952                         /* verify opmode is present */
2953                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2954                                 goto invalid;
2955                         goto queue;
2956                 }
2957                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2958                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2959                                 goto invalid;
2960                         goto queue;
2961                 }
2962                 default:
2963                         break;
2964                 }
2965                 break;
2966         case WLAN_CATEGORY_BACK:
2967                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2968                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2969                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2970                     sdata->vif.type != NL80211_IFTYPE_AP &&
2971                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2972                         break;
2973
2974                 /* verify action_code is present */
2975                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2976                         break;
2977
2978                 switch (mgmt->u.action.u.addba_req.action_code) {
2979                 case WLAN_ACTION_ADDBA_REQ:
2980                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2981                                    sizeof(mgmt->u.action.u.addba_req)))
2982                                 goto invalid;
2983                         break;
2984                 case WLAN_ACTION_ADDBA_RESP:
2985                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2986                                    sizeof(mgmt->u.action.u.addba_resp)))
2987                                 goto invalid;
2988                         break;
2989                 case WLAN_ACTION_DELBA:
2990                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2991                                    sizeof(mgmt->u.action.u.delba)))
2992                                 goto invalid;
2993                         break;
2994                 default:
2995                         goto invalid;
2996                 }
2997
2998                 goto queue;
2999         case WLAN_CATEGORY_SPECTRUM_MGMT:
3000                 /* verify action_code is present */
3001                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3002                         break;
3003
3004                 switch (mgmt->u.action.u.measurement.action_code) {
3005                 case WLAN_ACTION_SPCT_MSR_REQ:
3006                         if (status->band != NL80211_BAND_5GHZ)
3007                                 break;
3008
3009                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3010                                    sizeof(mgmt->u.action.u.measurement)))
3011                                 break;
3012
3013                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3014                                 break;
3015
3016                         ieee80211_process_measurement_req(sdata, mgmt, len);
3017                         goto handled;
3018                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3019                         u8 *bssid;
3020                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3021                                    sizeof(mgmt->u.action.u.chan_switch)))
3022                                 break;
3023
3024                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3025                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3026                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3027                                 break;
3028
3029                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3030                                 bssid = sdata->u.mgd.bssid;
3031                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3032                                 bssid = sdata->u.ibss.bssid;
3033                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3034                                 bssid = mgmt->sa;
3035                         else
3036                                 break;
3037
3038                         if (!ether_addr_equal(mgmt->bssid, bssid))
3039                                 break;
3040
3041                         goto queue;
3042                         }
3043                 }
3044                 break;
3045         case WLAN_CATEGORY_SA_QUERY:
3046                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3047                            sizeof(mgmt->u.action.u.sa_query)))
3048                         break;
3049
3050                 switch (mgmt->u.action.u.sa_query.action) {
3051                 case WLAN_ACTION_SA_QUERY_REQUEST:
3052                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3053                                 break;
3054                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3055                         goto handled;
3056                 }
3057                 break;
3058         case WLAN_CATEGORY_SELF_PROTECTED:
3059                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3060                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3061                         break;
3062
3063                 switch (mgmt->u.action.u.self_prot.action_code) {
3064                 case WLAN_SP_MESH_PEERING_OPEN:
3065                 case WLAN_SP_MESH_PEERING_CLOSE:
3066                 case WLAN_SP_MESH_PEERING_CONFIRM:
3067                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3068                                 goto invalid;
3069                         if (sdata->u.mesh.user_mpm)
3070                                 /* userspace handles this frame */
3071                                 break;
3072                         goto queue;
3073                 case WLAN_SP_MGK_INFORM:
3074                 case WLAN_SP_MGK_ACK:
3075                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3076                                 goto invalid;
3077                         break;
3078                 }
3079                 break;
3080         case WLAN_CATEGORY_MESH_ACTION:
3081                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3082                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3083                         break;
3084
3085                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3086                         break;
3087                 if (mesh_action_is_path_sel(mgmt) &&
3088                     !mesh_path_sel_is_hwmp(sdata))
3089                         break;
3090                 goto queue;
3091         }
3092
3093         return RX_CONTINUE;
3094
3095  invalid:
3096         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3097         /* will return in the next handlers */
3098         return RX_CONTINUE;
3099
3100  handled:
3101         if (rx->sta)
3102                 rx->sta->rx_stats.packets++;
3103         dev_kfree_skb(rx->skb);
3104         return RX_QUEUED;
3105
3106  queue:
3107         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3108         skb_queue_tail(&sdata->skb_queue, rx->skb);
3109         ieee80211_queue_work(&local->hw, &sdata->work);
3110         if (rx->sta)
3111                 rx->sta->rx_stats.packets++;
3112         return RX_QUEUED;
3113 }
3114
3115 static ieee80211_rx_result debug_noinline
3116 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3117 {
3118         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3119         int sig = 0;
3120
3121         /* skip known-bad action frames and return them in the next handler */
3122         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3123                 return RX_CONTINUE;
3124
3125         /*
3126          * Getting here means the kernel doesn't know how to handle
3127          * it, but maybe userspace does ... include returned frames
3128          * so userspace can register for those to know whether ones
3129          * it transmitted were processed or returned.
3130          */
3131
3132         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3133                 sig = status->signal;
3134
3135         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3136                              rx->skb->data, rx->skb->len, 0)) {
3137                 if (rx->sta)
3138                         rx->sta->rx_stats.packets++;
3139                 dev_kfree_skb(rx->skb);
3140                 return RX_QUEUED;
3141         }
3142
3143         return RX_CONTINUE;
3144 }
3145
3146 static ieee80211_rx_result debug_noinline
3147 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3148 {
3149         struct ieee80211_local *local = rx->local;
3150         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3151         struct sk_buff *nskb;
3152         struct ieee80211_sub_if_data *sdata = rx->sdata;
3153         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3154
3155         if (!ieee80211_is_action(mgmt->frame_control))
3156                 return RX_CONTINUE;
3157
3158         /*
3159          * For AP mode, hostapd is responsible for handling any action
3160          * frames that we didn't handle, including returning unknown
3161          * ones. For all other modes we will return them to the sender,
3162          * setting the 0x80 bit in the action category, as required by
3163          * 802.11-2012 9.24.4.
3164          * Newer versions of hostapd shall also use the management frame
3165          * registration mechanisms, but older ones still use cooked
3166          * monitor interfaces so push all frames there.
3167          */
3168         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3169             (sdata->vif.type == NL80211_IFTYPE_AP ||
3170              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3171                 return RX_DROP_MONITOR;
3172
3173         if (is_multicast_ether_addr(mgmt->da))
3174                 return RX_DROP_MONITOR;
3175
3176         /* do not return rejected action frames */
3177         if (mgmt->u.action.category & 0x80)
3178                 return RX_DROP_UNUSABLE;
3179
3180         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3181                                GFP_ATOMIC);
3182         if (nskb) {
3183                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3184
3185                 nmgmt->u.action.category |= 0x80;
3186                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3187                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3188
3189                 memset(nskb->cb, 0, sizeof(nskb->cb));
3190
3191                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3192                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3193
3194                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3195                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3196                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3197                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3198                                 info->hw_queue =
3199                                         local->hw.offchannel_tx_hw_queue;
3200                 }
3201
3202                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3203                                             status->band);
3204         }
3205         dev_kfree_skb(rx->skb);
3206         return RX_QUEUED;
3207 }
3208
3209 static ieee80211_rx_result debug_noinline
3210 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3211 {
3212         struct ieee80211_sub_if_data *sdata = rx->sdata;
3213         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3214         __le16 stype;
3215
3216         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3217
3218         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3219             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3220             sdata->vif.type != NL80211_IFTYPE_OCB &&
3221             sdata->vif.type != NL80211_IFTYPE_STATION)
3222                 return RX_DROP_MONITOR;
3223
3224         switch (stype) {
3225         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3226         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3227         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3228                 /* process for all: mesh, mlme, ibss */
3229                 break;
3230         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3231         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3232         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3233         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3234                 if (is_multicast_ether_addr(mgmt->da) &&
3235                     !is_broadcast_ether_addr(mgmt->da))
3236                         return RX_DROP_MONITOR;
3237
3238                 /* process only for station */
3239                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3240                         return RX_DROP_MONITOR;
3241                 break;
3242         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3243                 /* process only for ibss and mesh */
3244                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3245                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3246                         return RX_DROP_MONITOR;
3247                 break;
3248         default:
3249                 return RX_DROP_MONITOR;
3250         }
3251
3252         /* queue up frame and kick off work to process it */
3253         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3254         skb_queue_tail(&sdata->skb_queue, rx->skb);
3255         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3256         if (rx->sta)
3257                 rx->sta->rx_stats.packets++;
3258
3259         return RX_QUEUED;
3260 }
3261
3262 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3263                                         struct ieee80211_rate *rate)
3264 {
3265         struct ieee80211_sub_if_data *sdata;
3266         struct ieee80211_local *local = rx->local;
3267         struct sk_buff *skb = rx->skb, *skb2;
3268         struct net_device *prev_dev = NULL;
3269         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3270         int needed_headroom;
3271
3272         /*
3273          * If cooked monitor has been processed already, then
3274          * don't do it again. If not, set the flag.
3275          */
3276         if (rx->flags & IEEE80211_RX_CMNTR)
3277                 goto out_free_skb;
3278         rx->flags |= IEEE80211_RX_CMNTR;
3279
3280         /* If there are no cooked monitor interfaces, just free the SKB */
3281         if (!local->cooked_mntrs)
3282                 goto out_free_skb;
3283
3284         /* vendor data is long removed here */
3285         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3286         /* room for the radiotap header based on driver features */
3287         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3288
3289         if (skb_headroom(skb) < needed_headroom &&
3290             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3291                 goto out_free_skb;
3292
3293         /* prepend radiotap information */
3294         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3295                                          false);
3296
3297         skb_reset_mac_header(skb);
3298         skb->ip_summed = CHECKSUM_UNNECESSARY;
3299         skb->pkt_type = PACKET_OTHERHOST;
3300         skb->protocol = htons(ETH_P_802_2);
3301
3302         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3303                 if (!ieee80211_sdata_running(sdata))
3304                         continue;
3305
3306                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3307                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3308                         continue;
3309
3310                 if (prev_dev) {
3311                         skb2 = skb_clone(skb, GFP_ATOMIC);
3312                         if (skb2) {
3313                                 skb2->dev = prev_dev;
3314                                 netif_receive_skb(skb2);
3315                         }
3316                 }
3317
3318                 prev_dev = sdata->dev;
3319                 ieee80211_rx_stats(sdata->dev, skb->len);
3320         }
3321
3322         if (prev_dev) {
3323                 skb->dev = prev_dev;
3324                 netif_receive_skb(skb);
3325                 return;
3326         }
3327
3328  out_free_skb:
3329         dev_kfree_skb(skb);
3330 }
3331
3332 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3333                                          ieee80211_rx_result res)
3334 {
3335         switch (res) {
3336         case RX_DROP_MONITOR:
3337                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3338                 if (rx->sta)
3339                         rx->sta->rx_stats.dropped++;
3340                 /* fall through */
3341         case RX_CONTINUE: {
3342                 struct ieee80211_rate *rate = NULL;
3343                 struct ieee80211_supported_band *sband;
3344                 struct ieee80211_rx_status *status;
3345
3346                 status = IEEE80211_SKB_RXCB((rx->skb));
3347
3348                 sband = rx->local->hw.wiphy->bands[status->band];
3349                 if (!(status->encoding == RX_ENC_HT) &&
3350                     !(status->encoding == RX_ENC_VHT))
3351                         rate = &sband->bitrates[status->rate_idx];
3352
3353                 ieee80211_rx_cooked_monitor(rx, rate);
3354                 break;
3355                 }
3356         case RX_DROP_UNUSABLE:
3357                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3358                 if (rx->sta)
3359                         rx->sta->rx_stats.dropped++;
3360                 dev_kfree_skb(rx->skb);
3361                 break;
3362         case RX_QUEUED:
3363                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3364                 break;
3365         }
3366 }
3367
3368 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3369                                   struct sk_buff_head *frames)
3370 {
3371         ieee80211_rx_result res = RX_DROP_MONITOR;
3372         struct sk_buff *skb;
3373
3374 #define CALL_RXH(rxh)                   \
3375         do {                            \
3376                 res = rxh(rx);          \
3377                 if (res != RX_CONTINUE) \
3378                         goto rxh_next;  \
3379         } while (0)
3380
3381         /* Lock here to avoid hitting all of the data used in the RX
3382          * path (e.g. key data, station data, ...) concurrently when
3383          * a frame is released from the reorder buffer due to timeout
3384          * from the timer, potentially concurrently with RX from the
3385          * driver.
3386          */
3387         spin_lock_bh(&rx->local->rx_path_lock);
3388
3389         while ((skb = __skb_dequeue(frames))) {
3390                 /*
3391                  * all the other fields are valid across frames
3392                  * that belong to an aMPDU since they are on the
3393                  * same TID from the same station
3394                  */
3395                 rx->skb = skb;
3396
3397                 CALL_RXH(ieee80211_rx_h_check_more_data);
3398                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3399                 CALL_RXH(ieee80211_rx_h_sta_process);
3400                 CALL_RXH(ieee80211_rx_h_decrypt);
3401                 CALL_RXH(ieee80211_rx_h_defragment);
3402                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3403                 /* must be after MMIC verify so header is counted in MPDU mic */
3404 #ifdef CONFIG_MAC80211_MESH
3405                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3406                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3407 #endif
3408                 CALL_RXH(ieee80211_rx_h_amsdu);
3409                 CALL_RXH(ieee80211_rx_h_data);
3410
3411                 /* special treatment -- needs the queue */
3412                 res = ieee80211_rx_h_ctrl(rx, frames);
3413                 if (res != RX_CONTINUE)
3414                         goto rxh_next;
3415
3416                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3417                 CALL_RXH(ieee80211_rx_h_action);
3418                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3419                 CALL_RXH(ieee80211_rx_h_action_return);
3420                 CALL_RXH(ieee80211_rx_h_mgmt);
3421
3422  rxh_next:
3423                 ieee80211_rx_handlers_result(rx, res);
3424
3425 #undef CALL_RXH
3426         }
3427
3428         spin_unlock_bh(&rx->local->rx_path_lock);
3429 }
3430
3431 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3432 {
3433         struct sk_buff_head reorder_release;
3434         ieee80211_rx_result res = RX_DROP_MONITOR;
3435
3436         __skb_queue_head_init(&reorder_release);
3437
3438 #define CALL_RXH(rxh)                   \
3439         do {                            \
3440                 res = rxh(rx);          \
3441                 if (res != RX_CONTINUE) \
3442                         goto rxh_next;  \
3443         } while (0)
3444
3445         CALL_RXH(ieee80211_rx_h_check_dup);
3446         CALL_RXH(ieee80211_rx_h_check);
3447
3448         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3449
3450         ieee80211_rx_handlers(rx, &reorder_release);
3451         return;
3452
3453  rxh_next:
3454         ieee80211_rx_handlers_result(rx, res);
3455
3456 #undef CALL_RXH
3457 }
3458
3459 /*
3460  * This function makes calls into the RX path, therefore
3461  * it has to be invoked under RCU read lock.
3462  */
3463 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3464 {
3465         struct sk_buff_head frames;
3466         struct ieee80211_rx_data rx = {
3467                 .sta = sta,
3468                 .sdata = sta->sdata,
3469                 .local = sta->local,
3470                 /* This is OK -- must be QoS data frame */
3471                 .security_idx = tid,
3472                 .seqno_idx = tid,
3473                 .napi = NULL, /* must be NULL to not have races */
3474         };
3475         struct tid_ampdu_rx *tid_agg_rx;
3476
3477         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3478         if (!tid_agg_rx)
3479                 return;
3480
3481         __skb_queue_head_init(&frames);
3482
3483         spin_lock(&tid_agg_rx->reorder_lock);
3484         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3485         spin_unlock(&tid_agg_rx->reorder_lock);
3486
3487         if (!skb_queue_empty(&frames)) {
3488                 struct ieee80211_event event = {
3489                         .type = BA_FRAME_TIMEOUT,
3490                         .u.ba.tid = tid,
3491                         .u.ba.sta = &sta->sta,
3492                 };
3493                 drv_event_callback(rx.local, rx.sdata, &event);
3494         }
3495
3496         ieee80211_rx_handlers(&rx, &frames);
3497 }
3498
3499 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3500                                           u16 ssn, u64 filtered,
3501                                           u16 received_mpdus)
3502 {
3503         struct sta_info *sta;
3504         struct tid_ampdu_rx *tid_agg_rx;
3505         struct sk_buff_head frames;
3506         struct ieee80211_rx_data rx = {
3507                 /* This is OK -- must be QoS data frame */
3508                 .security_idx = tid,
3509                 .seqno_idx = tid,
3510         };
3511         int i, diff;
3512
3513         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3514                 return;
3515
3516         __skb_queue_head_init(&frames);
3517
3518         sta = container_of(pubsta, struct sta_info, sta);
3519
3520         rx.sta = sta;
3521         rx.sdata = sta->sdata;
3522         rx.local = sta->local;
3523
3524         rcu_read_lock();
3525         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3526         if (!tid_agg_rx)
3527                 goto out;
3528
3529         spin_lock_bh(&tid_agg_rx->reorder_lock);
3530
3531         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3532                 int release;
3533
3534                 /* release all frames in the reorder buffer */
3535                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3536                            IEEE80211_SN_MODULO;
3537                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3538                                                  release, &frames);
3539                 /* update ssn to match received ssn */
3540                 tid_agg_rx->head_seq_num = ssn;
3541         } else {
3542                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3543                                                  &frames);
3544         }
3545
3546         /* handle the case that received ssn is behind the mac ssn.
3547          * it can be tid_agg_rx->buf_size behind and still be valid */
3548         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3549         if (diff >= tid_agg_rx->buf_size) {
3550                 tid_agg_rx->reorder_buf_filtered = 0;
3551                 goto release;
3552         }
3553         filtered = filtered >> diff;
3554         ssn += diff;
3555
3556         /* update bitmap */
3557         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3558                 int index = (ssn + i) % tid_agg_rx->buf_size;
3559
3560                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3561                 if (filtered & BIT_ULL(i))
3562                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3563         }
3564
3565         /* now process also frames that the filter marking released */
3566         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3567
3568 release:
3569         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3570
3571         ieee80211_rx_handlers(&rx, &frames);
3572
3573  out:
3574         rcu_read_unlock();
3575 }
3576 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3577
3578 /* main receive path */
3579
3580 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3581 {
3582         struct ieee80211_sub_if_data *sdata = rx->sdata;
3583         struct sk_buff *skb = rx->skb;
3584         struct ieee80211_hdr *hdr = (void *)skb->data;
3585         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3586         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3587         bool multicast = is_multicast_ether_addr(hdr->addr1);
3588
3589         switch (sdata->vif.type) {
3590         case NL80211_IFTYPE_STATION:
3591                 if (!bssid && !sdata->u.mgd.use_4addr)
3592                         return false;
3593                 if (multicast)
3594                         return true;
3595                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3596         case NL80211_IFTYPE_ADHOC:
3597                 if (!bssid)
3598                         return false;
3599                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3600                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3601                         return false;
3602                 if (ieee80211_is_beacon(hdr->frame_control))
3603                         return true;
3604                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3605                         return false;
3606                 if (!multicast &&
3607                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3608                         return false;
3609                 if (!rx->sta) {
3610                         int rate_idx;
3611                         if (status->encoding != RX_ENC_LEGACY)
3612                                 rate_idx = 0; /* TODO: HT/VHT rates */
3613                         else
3614                                 rate_idx = status->rate_idx;
3615                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3616                                                  BIT(rate_idx));
3617                 }
3618                 return true;
3619         case NL80211_IFTYPE_OCB:
3620                 if (!bssid)
3621                         return false;
3622                 if (!ieee80211_is_data_present(hdr->frame_control))
3623                         return false;
3624                 if (!is_broadcast_ether_addr(bssid))
3625                         return false;
3626                 if (!multicast &&
3627                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3628                         return false;
3629                 if (!rx->sta) {
3630                         int rate_idx;
3631                         if (status->encoding != RX_ENC_LEGACY)
3632                                 rate_idx = 0; /* TODO: HT rates */
3633                         else
3634                                 rate_idx = status->rate_idx;
3635                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3636                                                 BIT(rate_idx));
3637                 }
3638                 return true;
3639         case NL80211_IFTYPE_MESH_POINT:
3640                 if (multicast)
3641                         return true;
3642                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3643         case NL80211_IFTYPE_AP_VLAN:
3644         case NL80211_IFTYPE_AP:
3645                 if (!bssid)
3646                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3647
3648                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3649                         /*
3650                          * Accept public action frames even when the
3651                          * BSSID doesn't match, this is used for P2P
3652                          * and location updates. Note that mac80211
3653                          * itself never looks at these frames.
3654                          */
3655                         if (!multicast &&
3656                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3657                                 return false;
3658                         if (ieee80211_is_public_action(hdr, skb->len))
3659                                 return true;
3660                         return ieee80211_is_beacon(hdr->frame_control);
3661                 }
3662
3663                 if (!ieee80211_has_tods(hdr->frame_control)) {
3664                         /* ignore data frames to TDLS-peers */
3665                         if (ieee80211_is_data(hdr->frame_control))
3666                                 return false;
3667                         /* ignore action frames to TDLS-peers */
3668                         if (ieee80211_is_action(hdr->frame_control) &&
3669                             !is_broadcast_ether_addr(bssid) &&
3670                             !ether_addr_equal(bssid, hdr->addr1))
3671                                 return false;
3672                 }
3673
3674                 /*
3675                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3676                  * the BSSID - we've checked that already but may have accepted
3677                  * the wildcard (ff:ff:ff:ff:ff:ff).
3678                  *
3679                  * It also says:
3680                  *      The BSSID of the Data frame is determined as follows:
3681                  *      a) If the STA is contained within an AP or is associated
3682                  *         with an AP, the BSSID is the address currently in use
3683                  *         by the STA contained in the AP.
3684                  *
3685                  * So we should not accept data frames with an address that's
3686                  * multicast.
3687                  *
3688                  * Accepting it also opens a security problem because stations
3689                  * could encrypt it with the GTK and inject traffic that way.
3690                  */
3691                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3692                         return false;
3693
3694                 return true;
3695         case NL80211_IFTYPE_WDS:
3696                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3697                         return false;
3698                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3699         case NL80211_IFTYPE_P2P_DEVICE:
3700                 return ieee80211_is_public_action(hdr, skb->len) ||
3701                        ieee80211_is_probe_req(hdr->frame_control) ||
3702                        ieee80211_is_probe_resp(hdr->frame_control) ||
3703                        ieee80211_is_beacon(hdr->frame_control);
3704         case NL80211_IFTYPE_NAN:
3705                 /* Currently no frames on NAN interface are allowed */
3706                 return false;
3707         default:
3708                 break;
3709         }
3710
3711         WARN_ON_ONCE(1);
3712         return false;
3713 }
3714
3715 void ieee80211_check_fast_rx(struct sta_info *sta)
3716 {
3717         struct ieee80211_sub_if_data *sdata = sta->sdata;
3718         struct ieee80211_local *local = sdata->local;
3719         struct ieee80211_key *key;
3720         struct ieee80211_fast_rx fastrx = {
3721                 .dev = sdata->dev,
3722                 .vif_type = sdata->vif.type,
3723                 .control_port_protocol = sdata->control_port_protocol,
3724         }, *old, *new = NULL;
3725         bool assign = false;
3726
3727         /* use sparse to check that we don't return without updating */
3728         __acquire(check_fast_rx);
3729
3730         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3731         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3732         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3733         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3734
3735         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3736
3737         /* fast-rx doesn't do reordering */
3738         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3739             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3740                 goto clear;
3741
3742         switch (sdata->vif.type) {
3743         case NL80211_IFTYPE_STATION:
3744                 /* 4-addr is harder to deal with, later maybe */
3745                 if (sdata->u.mgd.use_4addr)
3746                         goto clear;
3747                 /* software powersave is a huge mess, avoid all of it */
3748                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3749                         goto clear;
3750                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3751                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3752                         goto clear;
3753                 if (sta->sta.tdls) {
3754                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3755                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3756                         fastrx.expected_ds_bits = 0;
3757                 } else {
3758                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3759                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3760                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3761                         fastrx.expected_ds_bits =
3762                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3763                 }
3764                 break;
3765         case NL80211_IFTYPE_AP_VLAN:
3766         case NL80211_IFTYPE_AP:
3767                 /* parallel-rx requires this, at least with calls to
3768                  * ieee80211_sta_ps_transition()
3769                  */
3770                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3771                         goto clear;
3772                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3773                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3774                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3775
3776                 fastrx.internal_forward =
3777                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3778                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3779                          !sdata->u.vlan.sta);
3780                 break;
3781         default:
3782                 goto clear;
3783         }
3784
3785         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3786                 goto clear;
3787
3788         rcu_read_lock();
3789         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3790         if (key) {
3791                 switch (key->conf.cipher) {
3792                 case WLAN_CIPHER_SUITE_TKIP:
3793                         /* we don't want to deal with MMIC in fast-rx */
3794                         goto clear_rcu;
3795                 case WLAN_CIPHER_SUITE_CCMP:
3796                 case WLAN_CIPHER_SUITE_CCMP_256:
3797                 case WLAN_CIPHER_SUITE_GCMP:
3798                 case WLAN_CIPHER_SUITE_GCMP_256:
3799                         break;
3800                 default:
3801                         /* we also don't want to deal with WEP or cipher scheme
3802                          * since those require looking up the key idx in the
3803                          * frame, rather than assuming the PTK is used
3804                          * (we need to revisit this once we implement the real
3805                          * PTK index, which is now valid in the spec, but we
3806                          * haven't implemented that part yet)
3807                          */
3808                         goto clear_rcu;
3809                 }
3810
3811                 fastrx.key = true;
3812                 fastrx.icv_len = key->conf.icv_len;
3813         }
3814
3815         assign = true;
3816  clear_rcu:
3817         rcu_read_unlock();
3818  clear:
3819         __release(check_fast_rx);
3820
3821         if (assign)
3822                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3823
3824         spin_lock_bh(&sta->lock);
3825         old = rcu_dereference_protected(sta->fast_rx, true);
3826         rcu_assign_pointer(sta->fast_rx, new);
3827         spin_unlock_bh(&sta->lock);
3828
3829         if (old)
3830                 kfree_rcu(old, rcu_head);
3831 }
3832
3833 void ieee80211_clear_fast_rx(struct sta_info *sta)
3834 {
3835         struct ieee80211_fast_rx *old;
3836
3837         spin_lock_bh(&sta->lock);
3838         old = rcu_dereference_protected(sta->fast_rx, true);
3839         RCU_INIT_POINTER(sta->fast_rx, NULL);
3840         spin_unlock_bh(&sta->lock);
3841
3842         if (old)
3843                 kfree_rcu(old, rcu_head);
3844 }
3845
3846 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3847 {
3848         struct ieee80211_local *local = sdata->local;
3849         struct sta_info *sta;
3850
3851         lockdep_assert_held(&local->sta_mtx);
3852
3853         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3854                 if (sdata != sta->sdata &&
3855                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3856                         continue;
3857                 ieee80211_check_fast_rx(sta);
3858         }
3859 }
3860
3861 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3862 {
3863         struct ieee80211_local *local = sdata->local;
3864
3865         mutex_lock(&local->sta_mtx);
3866         __ieee80211_check_fast_rx_iface(sdata);
3867         mutex_unlock(&local->sta_mtx);
3868 }
3869
3870 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3871                                      struct ieee80211_fast_rx *fast_rx)
3872 {
3873         struct sk_buff *skb = rx->skb;
3874         struct ieee80211_hdr *hdr = (void *)skb->data;
3875         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3876         struct sta_info *sta = rx->sta;
3877         int orig_len = skb->len;
3878         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3879         struct {
3880                 u8 snap[sizeof(rfc1042_header)];
3881                 __be16 proto;
3882         } *payload __aligned(2);
3883         struct {
3884                 u8 da[ETH_ALEN];
3885                 u8 sa[ETH_ALEN];
3886         } addrs __aligned(2);
3887         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3888
3889         if (fast_rx->uses_rss)
3890                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3891
3892         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3893          * to a common data structure; drivers can implement that per queue
3894          * but we don't have that information in mac80211
3895          */
3896         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3897                 return false;
3898
3899 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3900
3901         /* If using encryption, we also need to have:
3902          *  - PN_VALIDATED: similar, but the implementation is tricky
3903          *  - DECRYPTED: necessary for PN_VALIDATED
3904          */
3905         if (fast_rx->key &&
3906             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3907                 return false;
3908
3909         /* we don't deal with A-MSDU deaggregation here */
3910         if (status->rx_flags & IEEE80211_RX_AMSDU)
3911                 return false;
3912
3913         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3914                 return false;
3915
3916         if (unlikely(ieee80211_is_frag(hdr)))
3917                 return false;
3918
3919         /* Since our interface address cannot be multicast, this
3920          * implicitly also rejects multicast frames without the
3921          * explicit check.
3922          *
3923          * We shouldn't get any *data* frames not addressed to us
3924          * (AP mode will accept multicast *management* frames), but
3925          * punting here will make it go through the full checks in
3926          * ieee80211_accept_frame().
3927          */
3928         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3929                 return false;
3930
3931         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3932                                               IEEE80211_FCTL_TODS)) !=
3933             fast_rx->expected_ds_bits)
3934                 goto drop;
3935
3936         /* assign the key to drop unencrypted frames (later)
3937          * and strip the IV/MIC if necessary
3938          */
3939         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3940                 /* GCMP header length is the same */
3941                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3942         }
3943
3944         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3945                 goto drop;
3946         payload = (void *)(skb->data + snap_offs);
3947
3948         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3949                 return false;
3950
3951         /* Don't handle these here since they require special code.
3952          * Accept AARP and IPX even though they should come with a
3953          * bridge-tunnel header - but if we get them this way then
3954          * there's little point in discarding them.
3955          */
3956         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3957                      payload->proto == fast_rx->control_port_protocol))
3958                 return false;
3959
3960         /* after this point, don't punt to the slowpath! */
3961
3962         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3963             pskb_trim(skb, skb->len - fast_rx->icv_len))
3964                 goto drop;
3965
3966         if (unlikely(fast_rx->sta_notify)) {
3967                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3968                 fast_rx->sta_notify = false;
3969         }
3970
3971         /* statistics part of ieee80211_rx_h_sta_process() */
3972         stats->last_rx = jiffies;
3973         stats->last_rate = sta_stats_encode_rate(status);
3974
3975         stats->fragments++;
3976         stats->packets++;
3977
3978         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3979                 stats->last_signal = status->signal;
3980                 if (!fast_rx->uses_rss)
3981                         ewma_signal_add(&sta->rx_stats_avg.signal,
3982                                         -status->signal);
3983         }
3984
3985         if (status->chains) {
3986                 int i;
3987
3988                 stats->chains = status->chains;
3989                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3990                         int signal = status->chain_signal[i];
3991
3992                         if (!(status->chains & BIT(i)))
3993                                 continue;
3994
3995                         stats->chain_signal_last[i] = signal;
3996                         if (!fast_rx->uses_rss)
3997                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3998                                                 -signal);
3999                 }
4000         }
4001         /* end of statistics */
4002
4003         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4004                 goto drop;
4005
4006         /* do the header conversion - first grab the addresses */
4007         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4008         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4009         /* remove the SNAP but leave the ethertype */
4010         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4011         /* push the addresses in front */
4012         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4013
4014         skb->dev = fast_rx->dev;
4015
4016         ieee80211_rx_stats(fast_rx->dev, skb->len);
4017
4018         /* The seqno index has the same property as needed
4019          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4020          * for non-QoS-data frames. Here we know it's a data
4021          * frame, so count MSDUs.
4022          */
4023         u64_stats_update_begin(&stats->syncp);
4024         stats->msdu[rx->seqno_idx]++;
4025         stats->bytes += orig_len;
4026         u64_stats_update_end(&stats->syncp);
4027
4028         if (fast_rx->internal_forward) {
4029                 struct sk_buff *xmit_skb = NULL;
4030                 bool multicast = is_multicast_ether_addr(skb->data);
4031
4032                 if (multicast) {
4033                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4034                 } else if (sta_info_get(rx->sdata, skb->data)) {
4035                         xmit_skb = skb;
4036                         skb = NULL;
4037                 }
4038
4039                 if (xmit_skb) {
4040                         /*
4041                          * Send to wireless media and increase priority by 256
4042                          * to keep the received priority instead of
4043                          * reclassifying the frame (see cfg80211_classify8021d).
4044                          */
4045                         xmit_skb->priority += 256;
4046                         xmit_skb->protocol = htons(ETH_P_802_3);
4047                         skb_reset_network_header(xmit_skb);
4048                         skb_reset_mac_header(xmit_skb);
4049                         dev_queue_xmit(xmit_skb);
4050                 }
4051
4052                 if (!skb)
4053                         return true;
4054         }
4055
4056         /* deliver to local stack */
4057         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4058         memset(skb->cb, 0, sizeof(skb->cb));
4059         if (rx->napi)
4060                 napi_gro_receive(rx->napi, skb);
4061         else
4062                 netif_receive_skb(skb);
4063
4064         return true;
4065  drop:
4066         dev_kfree_skb(skb);
4067         stats->dropped++;
4068         return true;
4069 }
4070
4071 /*
4072  * This function returns whether or not the SKB
4073  * was destined for RX processing or not, which,
4074  * if consume is true, is equivalent to whether
4075  * or not the skb was consumed.
4076  */
4077 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4078                                             struct sk_buff *skb, bool consume)
4079 {
4080         struct ieee80211_local *local = rx->local;
4081         struct ieee80211_sub_if_data *sdata = rx->sdata;
4082
4083         rx->skb = skb;
4084
4085         /* See if we can do fast-rx; if we have to copy we already lost,
4086          * so punt in that case. We should never have to deliver a data
4087          * frame to multiple interfaces anyway.
4088          *
4089          * We skip the ieee80211_accept_frame() call and do the necessary
4090          * checking inside ieee80211_invoke_fast_rx().
4091          */
4092         if (consume && rx->sta) {
4093                 struct ieee80211_fast_rx *fast_rx;
4094
4095                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4096                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4097                         return true;
4098         }
4099
4100         if (!ieee80211_accept_frame(rx))
4101                 return false;
4102
4103         if (!consume) {
4104                 skb = skb_copy(skb, GFP_ATOMIC);
4105                 if (!skb) {
4106                         if (net_ratelimit())
4107                                 wiphy_debug(local->hw.wiphy,
4108                                         "failed to copy skb for %s\n",
4109                                         sdata->name);
4110                         return true;
4111                 }
4112
4113                 rx->skb = skb;
4114         }
4115
4116         ieee80211_invoke_rx_handlers(rx);
4117         return true;
4118 }
4119
4120 /*
4121  * This is the actual Rx frames handler. as it belongs to Rx path it must
4122  * be called with rcu_read_lock protection.
4123  */
4124 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4125                                          struct ieee80211_sta *pubsta,
4126                                          struct sk_buff *skb,
4127                                          struct napi_struct *napi)
4128 {
4129         struct ieee80211_local *local = hw_to_local(hw);
4130         struct ieee80211_sub_if_data *sdata;
4131         struct ieee80211_hdr *hdr;
4132         __le16 fc;
4133         struct ieee80211_rx_data rx;
4134         struct ieee80211_sub_if_data *prev;
4135         struct rhlist_head *tmp;
4136         int err = 0;
4137
4138         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4139         memset(&rx, 0, sizeof(rx));
4140         rx.skb = skb;
4141         rx.local = local;
4142         rx.napi = napi;
4143
4144         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4145                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4146
4147         if (ieee80211_is_mgmt(fc)) {
4148                 /* drop frame if too short for header */
4149                 if (skb->len < ieee80211_hdrlen(fc))
4150                         err = -ENOBUFS;
4151                 else
4152                         err = skb_linearize(skb);
4153         } else {
4154                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4155         }
4156
4157         if (err) {
4158                 dev_kfree_skb(skb);
4159                 return;
4160         }
4161
4162         hdr = (struct ieee80211_hdr *)skb->data;
4163         ieee80211_parse_qos(&rx);
4164         ieee80211_verify_alignment(&rx);
4165
4166         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4167                      ieee80211_is_beacon(hdr->frame_control)))
4168                 ieee80211_scan_rx(local, skb);
4169
4170         if (ieee80211_is_data(fc)) {
4171                 struct sta_info *sta, *prev_sta;
4172
4173                 if (pubsta) {
4174                         rx.sta = container_of(pubsta, struct sta_info, sta);
4175                         rx.sdata = rx.sta->sdata;
4176                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4177                                 return;
4178                         goto out;
4179                 }
4180
4181                 prev_sta = NULL;
4182
4183                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4184                         if (!prev_sta) {
4185                                 prev_sta = sta;
4186                                 continue;
4187                         }
4188
4189                         rx.sta = prev_sta;
4190                         rx.sdata = prev_sta->sdata;
4191                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4192
4193                         prev_sta = sta;
4194                 }
4195
4196                 if (prev_sta) {
4197                         rx.sta = prev_sta;
4198                         rx.sdata = prev_sta->sdata;
4199
4200                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4201                                 return;
4202                         goto out;
4203                 }
4204         }
4205
4206         prev = NULL;
4207
4208         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4209                 if (!ieee80211_sdata_running(sdata))
4210                         continue;
4211
4212                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4213                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4214                         continue;
4215
4216                 /*
4217                  * frame is destined for this interface, but if it's
4218                  * not also for the previous one we handle that after
4219                  * the loop to avoid copying the SKB once too much
4220                  */
4221
4222                 if (!prev) {
4223                         prev = sdata;
4224                         continue;
4225                 }
4226
4227                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4228                 rx.sdata = prev;
4229                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4230
4231                 prev = sdata;
4232         }
4233
4234         if (prev) {
4235                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4236                 rx.sdata = prev;
4237
4238                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4239                         return;
4240         }
4241
4242  out:
4243         dev_kfree_skb(skb);
4244 }
4245
4246 /*
4247  * This is the receive path handler. It is called by a low level driver when an
4248  * 802.11 MPDU is received from the hardware.
4249  */
4250 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4251                        struct sk_buff *skb, struct napi_struct *napi)
4252 {
4253         struct ieee80211_local *local = hw_to_local(hw);
4254         struct ieee80211_rate *rate = NULL;
4255         struct ieee80211_supported_band *sband;
4256         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4257
4258         WARN_ON_ONCE(softirq_count() == 0);
4259
4260         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4261                 goto drop;
4262
4263         sband = local->hw.wiphy->bands[status->band];
4264         if (WARN_ON(!sband))
4265                 goto drop;
4266
4267         /*
4268          * If we're suspending, it is possible although not too likely
4269          * that we'd be receiving frames after having already partially
4270          * quiesced the stack. We can't process such frames then since
4271          * that might, for example, cause stations to be added or other
4272          * driver callbacks be invoked.
4273          */
4274         if (unlikely(local->quiescing || local->suspended))
4275                 goto drop;
4276
4277         /* We might be during a HW reconfig, prevent Rx for the same reason */
4278         if (unlikely(local->in_reconfig))
4279                 goto drop;
4280
4281         /*
4282          * The same happens when we're not even started,
4283          * but that's worth a warning.
4284          */
4285         if (WARN_ON(!local->started))
4286                 goto drop;
4287
4288         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4289                 /*
4290                  * Validate the rate, unless a PLCP error means that
4291                  * we probably can't have a valid rate here anyway.
4292                  */
4293
4294                 switch (status->encoding) {
4295                 case RX_ENC_HT:
4296                         /*
4297                          * rate_idx is MCS index, which can be [0-76]
4298                          * as documented on:
4299                          *
4300                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4301                          *
4302                          * Anything else would be some sort of driver or
4303                          * hardware error. The driver should catch hardware
4304                          * errors.
4305                          */
4306                         if (WARN(status->rate_idx > 76,
4307                                  "Rate marked as an HT rate but passed "
4308                                  "status->rate_idx is not "
4309                                  "an MCS index [0-76]: %d (0x%02x)\n",
4310                                  status->rate_idx,
4311                                  status->rate_idx))
4312                                 goto drop;
4313                         break;
4314                 case RX_ENC_VHT:
4315                         if (WARN_ONCE(status->rate_idx > 9 ||
4316                                       !status->nss ||
4317                                       status->nss > 8,
4318                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4319                                       status->rate_idx, status->nss))
4320                                 goto drop;
4321                         break;
4322                 default:
4323                         WARN_ON_ONCE(1);
4324                         /* fall through */
4325                 case RX_ENC_LEGACY:
4326                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4327                                 goto drop;
4328                         rate = &sband->bitrates[status->rate_idx];
4329                 }
4330         }
4331
4332         status->rx_flags = 0;
4333
4334         /*
4335          * key references and virtual interfaces are protected using RCU
4336          * and this requires that we are in a read-side RCU section during
4337          * receive processing
4338          */
4339         rcu_read_lock();
4340
4341         /*
4342          * Frames with failed FCS/PLCP checksum are not returned,
4343          * all other frames are returned without radiotap header
4344          * if it was previously present.
4345          * Also, frames with less than 16 bytes are dropped.
4346          */
4347         skb = ieee80211_rx_monitor(local, skb, rate);
4348         if (!skb) {
4349                 rcu_read_unlock();
4350                 return;
4351         }
4352
4353         ieee80211_tpt_led_trig_rx(local,
4354                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4355                         skb->len);
4356
4357         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4358
4359         rcu_read_unlock();
4360
4361         return;
4362  drop:
4363         kfree_skb(skb);
4364 }
4365 EXPORT_SYMBOL(ieee80211_rx_napi);
4366
4367 /* This is a version of the rx handler that can be called from hard irq
4368  * context. Post the skb on the queue and schedule the tasklet */
4369 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4370 {
4371         struct ieee80211_local *local = hw_to_local(hw);
4372
4373         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4374
4375         skb->pkt_type = IEEE80211_RX_MSG;
4376         skb_queue_tail(&local->skb_queue, skb);
4377         tasklet_schedule(&local->tasklet);
4378 }
4379 EXPORT_SYMBOL(ieee80211_rx_irqsafe);