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         /* vendor presence bitmap */
 145         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
 146                 len += 4;
 147
 148         if (ieee80211_have_rx_timestamp(status)) {
 149                 len = ALIGN(len, 8);
 150                 len += 8;
 151         }
 152         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 153                 len += 1;
 154
 155         /* antenna field, if we don't have per-chain info */
 156         if (!status->chains)
 157                 len += 1;
 158
 159         /* padding for RX_FLAGS if necessary */
 160         len = ALIGN(len, 2);
 161
 162         if (status->encoding == RX_ENC_HT) /* HT info */
 163                 len += 3;
 164
 165         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 166                 len = ALIGN(len, 4);
 167                 len += 8;
 168         }
 169
 170         if (status->encoding == RX_ENC_VHT) {
 171                 len = ALIGN(len, 2);
 172                 len += 12;
 173         }
 174
 175         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 176                 len = ALIGN(len, 8);
 177                 len += 12;
 178         }
 179
 180         if (status->chains) {
 181                 /* antenna and antenna signal fields */
 182                 len += 2 * hweight8(status->chains);
 183         }
 184
 185         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 186                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 187
 188                 /* alignment for fixed 6-byte vendor data header */
 189                 len = ALIGN(len, 2);
 190                 /* vendor data header */
 191                 len += 6;
 192                 if (WARN_ON(rtap->align == 0))
 193                         rtap->align = 1;
 194                 len = ALIGN(len, rtap->align);
 195                 len += rtap->len + rtap->pad;
 196         }
 197
 198         return len;
 199 }
 200
 201 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 202                                          struct sk_buff *skb,
 203                                          int rtap_vendor_space)
 204 {
 205         struct {
 206                 struct ieee80211_hdr_3addr hdr;
 207                 u8 category;
 208                 u8 action_code;
 209         } __packed __aligned(2) action;
 210
 211         if (!sdata)
 212                 return;
 213
 214         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 215
 216         if (skb->len < rtap_vendor_space + sizeof(action) +
 217                        VHT_MUMIMO_GROUPS_DATA_LEN)
 218                 return;
 219
 220         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 221                 return;
 222
 223         skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
 224
 225         if (!ieee80211_is_action(action.hdr.frame_control))
 226                 return;
 227
 228         if (action.category != WLAN_CATEGORY_VHT)
 229                 return;
 230
 231         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 232                 return;
 233
 234         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 235                 return;
 236
 237         skb = skb_copy(skb, GFP_ATOMIC);
 238         if (!skb)
 239                 return;
 240
 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 = 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_queue_tail(&rx->sdata->skb_queue, skb);
1221                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1222                 return;
1223         }
1224
1225         /*
1226          * No locking needed -- we will only ever process one
1227          * RX packet at a time, and thus own tid_agg_rx. All
1228          * other code manipulating it needs to (and does) make
1229          * sure that we cannot get to it any more before doing
1230          * anything with it.
1231          */
1232         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1233                                              frames))
1234                 return;
1235
1236  dont_reorder:
1237         __skb_queue_tail(frames, skb);
1238 }
1239
1240 static ieee80211_rx_result debug_noinline
1241 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1242 {
1243         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1244         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1245
1246         if (status->flag & RX_FLAG_DUP_VALIDATED)
1247                 return RX_CONTINUE;
1248
1249         /*
1250          * Drop duplicate 802.11 retransmissions
1251          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1252          */
1253
1254         if (rx->skb->len < 24)
1255                 return RX_CONTINUE;
1256
1257         if (ieee80211_is_ctl(hdr->frame_control) ||
1258             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1259             is_multicast_ether_addr(hdr->addr1))
1260                 return RX_CONTINUE;
1261
1262         if (!rx->sta)
1263                 return RX_CONTINUE;
1264
1265         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1266                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1267                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1268                 rx->sta->rx_stats.num_duplicates++;
1269                 return RX_DROP_UNUSABLE;
1270         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1271                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1272         }
1273
1274         return RX_CONTINUE;
1275 }
1276
1277 static ieee80211_rx_result debug_noinline
1278 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1279 {
1280         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1281
1282         /* Drop disallowed frame classes based on STA auth/assoc state;
1283          * IEEE 802.11, Chap 5.5.
1284          *
1285          * mac80211 filters only based on association state, i.e. it drops
1286          * Class 3 frames from not associated stations. hostapd sends
1287          * deauth/disassoc frames when needed. In addition, hostapd is
1288          * responsible for filtering on both auth and assoc states.
1289          */
1290
1291         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1292                 return ieee80211_rx_mesh_check(rx);
1293
1294         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1295                       ieee80211_is_pspoll(hdr->frame_control)) &&
1296                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1297                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1298                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1299                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1300                 /*
1301                  * accept port control frames from the AP even when it's not
1302                  * yet marked ASSOC to prevent a race where we don't set the
1303                  * assoc bit quickly enough before it sends the first frame
1304                  */
1305                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1306                     ieee80211_is_data_present(hdr->frame_control)) {
1307                         unsigned int hdrlen;
1308                         __be16 ethertype;
1309
1310                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1311
1312                         if (rx->skb->len < hdrlen + 8)
1313                                 return RX_DROP_MONITOR;
1314
1315                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1316                         if (ethertype == rx->sdata->control_port_protocol)
1317                                 return RX_CONTINUE;
1318                 }
1319
1320                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1321                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1322                                                hdr->addr2,
1323                                                GFP_ATOMIC))
1324                         return RX_DROP_UNUSABLE;
1325
1326                 return RX_DROP_MONITOR;
1327         }
1328
1329         return RX_CONTINUE;
1330 }
1331
1332
1333 static ieee80211_rx_result debug_noinline
1334 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1335 {
1336         struct ieee80211_local *local;
1337         struct ieee80211_hdr *hdr;
1338         struct sk_buff *skb;
1339
1340         local = rx->local;
1341         skb = rx->skb;
1342         hdr = (struct ieee80211_hdr *) skb->data;
1343
1344         if (!local->pspolling)
1345                 return RX_CONTINUE;
1346
1347         if (!ieee80211_has_fromds(hdr->frame_control))
1348                 /* this is not from AP */
1349                 return RX_CONTINUE;
1350
1351         if (!ieee80211_is_data(hdr->frame_control))
1352                 return RX_CONTINUE;
1353
1354         if (!ieee80211_has_moredata(hdr->frame_control)) {
1355                 /* AP has no more frames buffered for us */
1356                 local->pspolling = false;
1357                 return RX_CONTINUE;
1358         }
1359
1360         /* more data bit is set, let's request a new frame from the AP */
1361         ieee80211_send_pspoll(local, rx->sdata);
1362
1363         return RX_CONTINUE;
1364 }
1365
1366 static void sta_ps_start(struct sta_info *sta)
1367 {
1368         struct ieee80211_sub_if_data *sdata = sta->sdata;
1369         struct ieee80211_local *local = sdata->local;
1370         struct ps_data *ps;
1371         int tid;
1372
1373         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1374             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1375                 ps = &sdata->bss->ps;
1376         else
1377                 return;
1378
1379         atomic_inc(&ps->num_sta_ps);
1380         set_sta_flag(sta, WLAN_STA_PS_STA);
1381         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1382                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1383         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1384                sta->sta.addr, sta->sta.aid);
1385
1386         ieee80211_clear_fast_xmit(sta);
1387
1388         if (!sta->sta.txq[0])
1389                 return;
1390
1391         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1392                 if (txq_has_queue(sta->sta.txq[tid]))
1393                         set_bit(tid, &sta->txq_buffered_tids);
1394                 else
1395                         clear_bit(tid, &sta->txq_buffered_tids);
1396         }
1397 }
1398
1399 static void sta_ps_end(struct sta_info *sta)
1400 {
1401         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1402                sta->sta.addr, sta->sta.aid);
1403
1404         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1405                 /*
1406                  * Clear the flag only if the other one is still set
1407                  * so that the TX path won't start TX'ing new frames
1408                  * directly ... In the case that the driver flag isn't
1409                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1410                  */
1411                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1412                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1413                        sta->sta.addr, sta->sta.aid);
1414                 return;
1415         }
1416
1417         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1418         clear_sta_flag(sta, WLAN_STA_PS_STA);
1419         ieee80211_sta_ps_deliver_wakeup(sta);
1420 }
1421
1422 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1423 {
1424         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1425         bool in_ps;
1426
1427         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1428
1429         /* Don't let the same PS state be set twice */
1430         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1431         if ((start && in_ps) || (!start && !in_ps))
1432                 return -EINVAL;
1433
1434         if (start)
1435                 sta_ps_start(sta);
1436         else
1437                 sta_ps_end(sta);
1438
1439         return 0;
1440 }
1441 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1442
1443 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1444 {
1445         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1446
1447         if (test_sta_flag(sta, WLAN_STA_SP))
1448                 return;
1449
1450         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1451                 ieee80211_sta_ps_deliver_poll_response(sta);
1452         else
1453                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1454 }
1455 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1456
1457 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1458 {
1459         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1460         int ac = ieee80211_ac_from_tid(tid);
1461
1462         /*
1463          * If this AC is not trigger-enabled do nothing unless the
1464          * driver is calling us after it already checked.
1465          *
1466          * NB: This could/should check a separate bitmap of trigger-
1467          * enabled queues, but for now we only implement uAPSD w/o
1468          * TSPEC changes to the ACs, so they're always the same.
1469          */
1470         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1471             tid != IEEE80211_NUM_TIDS)
1472                 return;
1473
1474         /* if we are in a service period, do nothing */
1475         if (test_sta_flag(sta, WLAN_STA_SP))
1476                 return;
1477
1478         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1479                 ieee80211_sta_ps_deliver_uapsd(sta);
1480         else
1481                 set_sta_flag(sta, WLAN_STA_UAPSD);
1482 }
1483 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1484
1485 static ieee80211_rx_result debug_noinline
1486 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1487 {
1488         struct ieee80211_sub_if_data *sdata = rx->sdata;
1489         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1490         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1491
1492         if (!rx->sta)
1493                 return RX_CONTINUE;
1494
1495         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1496             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1497                 return RX_CONTINUE;
1498
1499         /*
1500          * The device handles station powersave, so don't do anything about
1501          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1502          * it to mac80211 since they're handled.)
1503          */
1504         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1505                 return RX_CONTINUE;
1506
1507         /*
1508          * Don't do anything if the station isn't already asleep. In
1509          * the uAPSD case, the station will probably be marked asleep,
1510          * in the PS-Poll case the station must be confused ...
1511          */
1512         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1513                 return RX_CONTINUE;
1514
1515         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1516                 ieee80211_sta_pspoll(&rx->sta->sta);
1517
1518                 /* Free PS Poll skb here instead of returning RX_DROP that would
1519                  * count as an dropped frame. */
1520                 dev_kfree_skb(rx->skb);
1521
1522                 return RX_QUEUED;
1523         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1524                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1525                    ieee80211_has_pm(hdr->frame_control) &&
1526                    (ieee80211_is_data_qos(hdr->frame_control) ||
1527                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1528                 u8 tid;
1529
1530                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1531
1532                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1533         }
1534
1535         return RX_CONTINUE;
1536 }
1537
1538 static ieee80211_rx_result debug_noinline
1539 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1540 {
1541         struct sta_info *sta = rx->sta;
1542         struct sk_buff *skb = rx->skb;
1543         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1544         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1545         int i;
1546
1547         if (!sta)
1548                 return RX_CONTINUE;
1549
1550         /*
1551          * Update last_rx only for IBSS packets which are for the current
1552          * BSSID and for station already AUTHORIZED to avoid keeping the
1553          * current IBSS network alive in cases where other STAs start
1554          * using different BSSID. This will also give the station another
1555          * chance to restart the authentication/authorization in case
1556          * something went wrong the first time.
1557          */
1558         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1559                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1560                                                 NL80211_IFTYPE_ADHOC);
1561                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1562                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1563                         sta->rx_stats.last_rx = jiffies;
1564                         if (ieee80211_is_data(hdr->frame_control) &&
1565                             !is_multicast_ether_addr(hdr->addr1))
1566                                 sta->rx_stats.last_rate =
1567                                         sta_stats_encode_rate(status);
1568                 }
1569         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1570                 sta->rx_stats.last_rx = jiffies;
1571         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1572                 /*
1573                  * Mesh beacons will update last_rx when if they are found to
1574                  * match the current local configuration when processed.
1575                  */
1576                 sta->rx_stats.last_rx = jiffies;
1577                 if (ieee80211_is_data(hdr->frame_control))
1578                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1579         }
1580
1581         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1582                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1583
1584         sta->rx_stats.fragments++;
1585
1586         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1587         sta->rx_stats.bytes += rx->skb->len;
1588         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1589
1590         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1591                 sta->rx_stats.last_signal = status->signal;
1592                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1593         }
1594
1595         if (status->chains) {
1596                 sta->rx_stats.chains = status->chains;
1597                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1598                         int signal = status->chain_signal[i];
1599
1600                         if (!(status->chains & BIT(i)))
1601                                 continue;
1602
1603                         sta->rx_stats.chain_signal_last[i] = signal;
1604                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1605                                         -signal);
1606                 }
1607         }
1608
1609         /*
1610          * Change STA power saving mode only at the end of a frame
1611          * exchange sequence.
1612          */
1613         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1614             !ieee80211_has_morefrags(hdr->frame_control) &&
1615             !ieee80211_is_back_req(hdr->frame_control) &&
1616             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1617             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1618              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1619             /*
1620              * PM bit is only checked in frames where it isn't reserved,
1621              * in AP mode it's reserved in non-bufferable management frames
1622              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1623              * BAR frames should be ignored as specified in
1624              * IEEE 802.11-2012 10.2.1.2.
1625              */
1626             (!ieee80211_is_mgmt(hdr->frame_control) ||
1627              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1628                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1629                         if (!ieee80211_has_pm(hdr->frame_control))
1630                                 sta_ps_end(sta);
1631                 } else {
1632                         if (ieee80211_has_pm(hdr->frame_control))
1633                                 sta_ps_start(sta);
1634                 }
1635         }
1636
1637         /* mesh power save support */
1638         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1639                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1640
1641         /*
1642          * Drop (qos-)data::nullfunc frames silently, since they
1643          * are used only to control station power saving mode.
1644          */
1645         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1646                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1647
1648                 /*
1649                  * If we receive a 4-addr nullfunc frame from a STA
1650                  * that was not moved to a 4-addr STA vlan yet send
1651                  * the event to userspace and for older hostapd drop
1652                  * the frame to the monitor interface.
1653                  */
1654                 if (ieee80211_has_a4(hdr->frame_control) &&
1655                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1656                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1657                       !rx->sdata->u.vlan.sta))) {
1658                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1659                                 cfg80211_rx_unexpected_4addr_frame(
1660                                         rx->sdata->dev, sta->sta.addr,
1661                                         GFP_ATOMIC);
1662                         return RX_DROP_MONITOR;
1663                 }
1664                 /*
1665                  * Update counter and free packet here to avoid
1666                  * counting this as a dropped packed.
1667                  */
1668                 sta->rx_stats.packets++;
1669                 dev_kfree_skb(rx->skb);
1670                 return RX_QUEUED;
1671         }
1672
1673         return RX_CONTINUE;
1674 } /* ieee80211_rx_h_sta_process */
1675
1676 static ieee80211_rx_result debug_noinline
1677 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1678 {
1679         struct sk_buff *skb = rx->skb;
1680         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1681         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1682         int keyidx;
1683         int hdrlen;
1684         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1685         struct ieee80211_key *sta_ptk = NULL;
1686         int mmie_keyidx = -1;
1687         __le16 fc;
1688         const struct ieee80211_cipher_scheme *cs = NULL;
1689
1690         /*
1691          * Key selection 101
1692          *
1693          * There are four types of keys:
1694          *  - GTK (group keys)
1695          *  - IGTK (group keys for management frames)
1696          *  - PTK (pairwise keys)
1697          *  - STK (station-to-station pairwise keys)
1698          *
1699          * When selecting a key, we have to distinguish between multicast
1700          * (including broadcast) and unicast frames, the latter can only
1701          * use PTKs and STKs while the former always use GTKs and IGTKs.
1702          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1703          * unicast frames can also use key indices like GTKs. Hence, if we
1704          * don't have a PTK/STK we check the key index for a WEP key.
1705          *
1706          * Note that in a regular BSS, multicast frames are sent by the
1707          * AP only, associated stations unicast the frame to the AP first
1708          * which then multicasts it on their behalf.
1709          *
1710          * There is also a slight problem in IBSS mode: GTKs are negotiated
1711          * with each station, that is something we don't currently handle.
1712          * The spec seems to expect that one negotiates the same key with
1713          * every station but there's no such requirement; VLANs could be
1714          * possible.
1715          */
1716
1717         /* start without a key */
1718         rx->key = NULL;
1719         fc = hdr->frame_control;
1720
1721         if (rx->sta) {
1722                 int keyid = rx->sta->ptk_idx;
1723
1724                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1725                         cs = rx->sta->cipher_scheme;
1726                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1727                         if (unlikely(keyid < 0))
1728                                 return RX_DROP_UNUSABLE;
1729                 }
1730                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1731         }
1732
1733         if (!ieee80211_has_protected(fc))
1734                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1735
1736         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1737                 rx->key = sta_ptk;
1738                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1739                     (status->flag & RX_FLAG_IV_STRIPPED))
1740                         return RX_CONTINUE;
1741                 /* Skip decryption if the frame is not protected. */
1742                 if (!ieee80211_has_protected(fc))
1743                         return RX_CONTINUE;
1744         } else if (mmie_keyidx >= 0) {
1745                 /* Broadcast/multicast robust management frame / BIP */
1746                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1747                     (status->flag & RX_FLAG_IV_STRIPPED))
1748                         return RX_CONTINUE;
1749
1750                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1751                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1752                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1753                 if (rx->sta) {
1754                         if (ieee80211_is_group_privacy_action(skb) &&
1755                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1756                                 return RX_DROP_MONITOR;
1757
1758                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1759                 }
1760                 if (!rx->key)
1761                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1762         } else if (!ieee80211_has_protected(fc)) {
1763                 /*
1764                  * The frame was not protected, so skip decryption. However, we
1765                  * need to set rx->key if there is a key that could have been
1766                  * used so that the frame may be dropped if encryption would
1767                  * have been expected.
1768                  */
1769                 struct ieee80211_key *key = NULL;
1770                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1771                 int i;
1772
1773                 if (ieee80211_is_mgmt(fc) &&
1774                     is_multicast_ether_addr(hdr->addr1) &&
1775                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1776                         rx->key = key;
1777                 else {
1778                         if (rx->sta) {
1779                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1780                                         key = rcu_dereference(rx->sta->gtk[i]);
1781                                         if (key)
1782                                                 break;
1783                                 }
1784                         }
1785                         if (!key) {
1786                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1787                                         key = rcu_dereference(sdata->keys[i]);
1788                                         if (key)
1789                                                 break;
1790                                 }
1791                         }
1792                         if (key)
1793                                 rx->key = key;
1794                 }
1795                 return RX_CONTINUE;
1796         } else {
1797                 u8 keyid;
1798
1799                 /*
1800                  * The device doesn't give us the IV so we won't be
1801                  * able to look up the key. That's ok though, we
1802                  * don't need to decrypt the frame, we just won't
1803                  * be able to keep statistics accurate.
1804                  * Except for key threshold notifications, should
1805                  * we somehow allow the driver to tell us which key
1806                  * the hardware used if this flag is set?
1807                  */
1808                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1809                     (status->flag & RX_FLAG_IV_STRIPPED))
1810                         return RX_CONTINUE;
1811
1812                 hdrlen = ieee80211_hdrlen(fc);
1813
1814                 if (cs) {
1815                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1816
1817                         if (unlikely(keyidx < 0))
1818                                 return RX_DROP_UNUSABLE;
1819                 } else {
1820                         if (rx->skb->len < 8 + hdrlen)
1821                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1822                         /*
1823                          * no need to call ieee80211_wep_get_keyidx,
1824                          * it verifies a bunch of things we've done already
1825                          */
1826                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1827                         keyidx = keyid >> 6;
1828                 }
1829
1830                 /* check per-station GTK first, if multicast packet */
1831                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1832                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1833
1834                 /* if not found, try default key */
1835                 if (!rx->key) {
1836                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1837
1838                         /*
1839                          * RSNA-protected unicast frames should always be
1840                          * sent with pairwise or station-to-station keys,
1841                          * but for WEP we allow using a key index as well.
1842                          */
1843                         if (rx->key &&
1844                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1845                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1846                             !is_multicast_ether_addr(hdr->addr1))
1847                                 rx->key = NULL;
1848                 }
1849         }
1850
1851         if (rx->key) {
1852                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1853                         return RX_DROP_MONITOR;
1854
1855                 /* TODO: add threshold stuff again */
1856         } else {
1857                 return RX_DROP_MONITOR;
1858         }
1859
1860         switch (rx->key->conf.cipher) {
1861         case WLAN_CIPHER_SUITE_WEP40:
1862         case WLAN_CIPHER_SUITE_WEP104:
1863                 result = ieee80211_crypto_wep_decrypt(rx);
1864                 break;
1865         case WLAN_CIPHER_SUITE_TKIP:
1866                 result = ieee80211_crypto_tkip_decrypt(rx);
1867                 break;
1868         case WLAN_CIPHER_SUITE_CCMP:
1869                 result = ieee80211_crypto_ccmp_decrypt(
1870                         rx, IEEE80211_CCMP_MIC_LEN);
1871                 break;
1872         case WLAN_CIPHER_SUITE_CCMP_256:
1873                 result = ieee80211_crypto_ccmp_decrypt(
1874                         rx, IEEE80211_CCMP_256_MIC_LEN);
1875                 break;
1876         case WLAN_CIPHER_SUITE_AES_CMAC:
1877                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1878                 break;
1879         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1880                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1881                 break;
1882         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1883         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1884                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1885                 break;
1886         case WLAN_CIPHER_SUITE_GCMP:
1887         case WLAN_CIPHER_SUITE_GCMP_256:
1888                 result = ieee80211_crypto_gcmp_decrypt(rx);
1889                 break;
1890         default:
1891                 result = ieee80211_crypto_hw_decrypt(rx);
1892         }
1893
1894         /* the hdr variable is invalid after the decrypt handlers */
1895
1896         /* either the frame has been decrypted or will be dropped */
1897         status->flag |= RX_FLAG_DECRYPTED;
1898
1899         return result;
1900 }
1901
1902 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
1903 {
1904         int i;
1905
1906         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
1907                 skb_queue_head_init(&cache->entries[i].skb_list);
1908 }
1909
1910 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
1911 {
1912         int i;
1913
1914         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
1915                 __skb_queue_purge(&cache->entries[i].skb_list);
1916 }
1917
1918 static inline struct ieee80211_fragment_entry *
1919 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
1920                          unsigned int frag, unsigned int seq, int rx_queue,
1921                          struct sk_buff **skb)
1922 {
1923         struct ieee80211_fragment_entry *entry;
1924
1925         entry = &cache->entries[cache->next++];
1926         if (cache->next >= IEEE80211_FRAGMENT_MAX)
1927                 cache->next = 0;
1928
1929         __skb_queue_purge(&entry->skb_list);
1930
1931         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1932         *skb = NULL;
1933         entry->first_frag_time = jiffies;
1934         entry->seq = seq;
1935         entry->rx_queue = rx_queue;
1936         entry->last_frag = frag;
1937         entry->check_sequential_pn = false;
1938         entry->extra_len = 0;
1939
1940         return entry;
1941 }
1942
1943 static inline struct ieee80211_fragment_entry *
1944 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
1945                           unsigned int frag, unsigned int seq,
1946                           int rx_queue, struct ieee80211_hdr *hdr)
1947 {
1948         struct ieee80211_fragment_entry *entry;
1949         int i, idx;
1950
1951         idx = cache->next;
1952         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1953                 struct ieee80211_hdr *f_hdr;
1954
1955                 idx--;
1956                 if (idx < 0)
1957                         idx = IEEE80211_FRAGMENT_MAX - 1;
1958
1959                 entry = &cache->entries[idx];
1960                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1961                     entry->rx_queue != rx_queue ||
1962                     entry->last_frag + 1 != frag)
1963                         continue;
1964
1965                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1966
1967                 /*
1968                  * Check ftype and addresses are equal, else check next fragment
1969                  */
1970                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1971                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1972                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1973                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1974                         continue;
1975
1976                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1977                         __skb_queue_purge(&entry->skb_list);
1978                         continue;
1979                 }
1980                 return entry;
1981         }
1982
1983         return NULL;
1984 }
1985
1986 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
1987 {
1988         return rx->key &&
1989                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1990                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1991                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1992                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1993                 ieee80211_has_protected(fc);
1994 }
1995
1996 static ieee80211_rx_result debug_noinline
1997 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1998 {
1999         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2000         struct ieee80211_hdr *hdr;
2001         u16 sc;
2002         __le16 fc;
2003         unsigned int frag, seq;
2004         struct ieee80211_fragment_entry *entry;
2005         struct sk_buff *skb;
2006         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2007
2008         hdr = (struct ieee80211_hdr *)rx->skb->data;
2009         fc = hdr->frame_control;
2010
2011         if (ieee80211_is_ctl(fc))
2012                 return RX_CONTINUE;
2013
2014         sc = le16_to_cpu(hdr->seq_ctrl);
2015         frag = sc & IEEE80211_SCTL_FRAG;
2016
2017         if (rx->sta)
2018                 cache = &rx->sta->frags;
2019
2020         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2021                 goto out;
2022
2023         if (is_multicast_ether_addr(hdr->addr1))
2024                 return RX_DROP_MONITOR;
2025
2026         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2027
2028         if (skb_linearize(rx->skb))
2029                 return RX_DROP_UNUSABLE;
2030
2031         /*
2032          *  skb_linearize() might change the skb->data and
2033          *  previously cached variables (in this case, hdr) need to
2034          *  be refreshed with the new data.
2035          */
2036         hdr = (struct ieee80211_hdr *)rx->skb->data;
2037         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2038
2039         if (frag == 0) {
2040                 /* This is the first fragment of a new frame. */
2041                 entry = ieee80211_reassemble_add(cache, frag, seq,
2042                                                  rx->seqno_idx, &(rx->skb));
2043                 if (requires_sequential_pn(rx, fc)) {
2044                         int queue = rx->security_idx;
2045
2046                         /* Store CCMP/GCMP PN so that we can verify that the
2047                          * next fragment has a sequential PN value.
2048                          */
2049                         entry->check_sequential_pn = true;
2050                         entry->is_protected = true;
2051                         entry->key_color = rx->key->color;
2052                         memcpy(entry->last_pn,
2053                                rx->key->u.ccmp.rx_pn[queue],
2054                                IEEE80211_CCMP_PN_LEN);
2055                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2056                                               u.ccmp.rx_pn) !=
2057                                      offsetof(struct ieee80211_key,
2058                                               u.gcmp.rx_pn));
2059                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2060                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2061                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2062                                      IEEE80211_GCMP_PN_LEN);
2063                 } else if (rx->key &&
2064                            (ieee80211_has_protected(fc) ||
2065                             (status->flag & RX_FLAG_DECRYPTED))) {
2066                         entry->is_protected = true;
2067                         entry->key_color = rx->key->color;
2068                 }
2069                 return RX_QUEUED;
2070         }
2071
2072         /* This is a fragment for a frame that should already be pending in
2073          * fragment cache. Add this fragment to the end of the pending entry.
2074          */
2075         entry = ieee80211_reassemble_find(cache, frag, seq,
2076                                           rx->seqno_idx, hdr);
2077         if (!entry) {
2078                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2079                 return RX_DROP_MONITOR;
2080         }
2081
2082         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2083          *  MPDU PN values are not incrementing in steps of 1."
2084          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2085          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2086          */
2087         if (entry->check_sequential_pn) {
2088                 int i;
2089                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2090
2091                 if (!requires_sequential_pn(rx, fc))
2092                         return RX_DROP_UNUSABLE;
2093
2094                 /* Prevent mixed key and fragment cache attacks */
2095                 if (entry->key_color != rx->key->color)
2096                         return RX_DROP_UNUSABLE;
2097
2098                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2099                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2100                         pn[i]++;
2101                         if (pn[i])
2102                                 break;
2103                 }
2104
2105                 rpn = rx->ccm_gcm.pn;
2106                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2107                         return RX_DROP_UNUSABLE;
2108                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2109         } else if (entry->is_protected &&
2110                    (!rx->key ||
2111                     (!ieee80211_has_protected(fc) &&
2112                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2113                     rx->key->color != entry->key_color)) {
2114                 /* Drop this as a mixed key or fragment cache attack, even
2115                  * if for TKIP Michael MIC should protect us, and WEP is a
2116                  * lost cause anyway.
2117                  */
2118                 return RX_DROP_UNUSABLE;
2119         } else if (entry->is_protected && rx->key &&
2120                    entry->key_color != rx->key->color &&
2121                    (status->flag & RX_FLAG_DECRYPTED)) {
2122                 return RX_DROP_UNUSABLE;
2123         }
2124
2125         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2126         __skb_queue_tail(&entry->skb_list, rx->skb);
2127         entry->last_frag = frag;
2128         entry->extra_len += rx->skb->len;
2129         if (ieee80211_has_morefrags(fc)) {
2130                 rx->skb = NULL;
2131                 return RX_QUEUED;
2132         }
2133
2134         rx->skb = __skb_dequeue(&entry->skb_list);
2135         if (skb_tailroom(rx->skb) < entry->extra_len) {
2136                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2137                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2138                                               GFP_ATOMIC))) {
2139                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2140                         __skb_queue_purge(&entry->skb_list);
2141                         return RX_DROP_UNUSABLE;
2142                 }
2143         }
2144         while ((skb = __skb_dequeue(&entry->skb_list))) {
2145                 skb_put_data(rx->skb, skb->data, skb->len);
2146                 dev_kfree_skb(skb);
2147         }
2148
2149  out:
2150         ieee80211_led_rx(rx->local);
2151         if (rx->sta)
2152                 rx->sta->rx_stats.packets++;
2153         return RX_CONTINUE;
2154 }
2155
2156 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2157 {
2158         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2159                 return -EACCES;
2160
2161         return 0;
2162 }
2163
2164 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2165 {
2166         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2167         struct sk_buff *skb = rx->skb;
2168         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2169
2170         /*
2171          * Pass through unencrypted frames if the hardware has
2172          * decrypted them already.
2173          */
2174         if (status->flag & RX_FLAG_DECRYPTED)
2175                 return 0;
2176
2177         /* check mesh EAPOL frames first */
2178         if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2179                      ieee80211_is_data(fc))) {
2180                 struct ieee80211s_hdr *mesh_hdr;
2181                 u16 hdr_len = ieee80211_hdrlen(fc);
2182                 u16 ethertype_offset;
2183                 __be16 ethertype;
2184
2185                 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2186                         goto drop_check;
2187
2188                 /* make sure fixed part of mesh header is there, also checks skb len */
2189                 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2190                         goto drop_check;
2191
2192                 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2193                 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2194                                    sizeof(rfc1042_header);
2195
2196                 if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
2197                     ethertype == rx->sdata->control_port_protocol)
2198                         return 0;
2199         }
2200
2201 drop_check:
2202         /* Drop unencrypted frames if key is set. */
2203         if (unlikely(!ieee80211_has_protected(fc) &&
2204                      !ieee80211_is_any_nullfunc(fc) &&
2205                      ieee80211_is_data(fc) && rx->key))
2206                 return -EACCES;
2207
2208         return 0;
2209 }
2210
2211 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2212 {
2213         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2214         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2215         __le16 fc = hdr->frame_control;
2216
2217         /*
2218          * Pass through unencrypted frames if the hardware has
2219          * decrypted them already.
2220          */
2221         if (status->flag & RX_FLAG_DECRYPTED)
2222                 return 0;
2223
2224         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2225                 if (unlikely(!ieee80211_has_protected(fc) &&
2226                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2227                              rx->key)) {
2228                         if (ieee80211_is_deauth(fc) ||
2229                             ieee80211_is_disassoc(fc))
2230                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2231                                                              rx->skb->data,
2232                                                              rx->skb->len);
2233                         return -EACCES;
2234                 }
2235                 /* BIP does not use Protected field, so need to check MMIE */
2236                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2237                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2238                         if (ieee80211_is_deauth(fc) ||
2239                             ieee80211_is_disassoc(fc))
2240                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2241                                                              rx->skb->data,
2242                                                              rx->skb->len);
2243                         return -EACCES;
2244                 }
2245                 /*
2246                  * When using MFP, Action frames are not allowed prior to
2247                  * having configured keys.
2248                  */
2249                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2250                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2251                         return -EACCES;
2252         }
2253
2254         return 0;
2255 }
2256
2257 static int
2258 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2259 {
2260         struct ieee80211_sub_if_data *sdata = rx->sdata;
2261         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2262         bool check_port_control = false;
2263         struct ethhdr *ehdr;
2264         int ret;
2265
2266         *port_control = false;
2267         if (ieee80211_has_a4(hdr->frame_control) &&
2268             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2269                 return -1;
2270
2271         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2272             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2273
2274                 if (!sdata->u.mgd.use_4addr)
2275                         return -1;
2276                 else
2277                         check_port_control = true;
2278         }
2279
2280         if (is_multicast_ether_addr(hdr->addr1) &&
2281             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2282                 return -1;
2283
2284         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2285         if (ret < 0)
2286                 return ret;
2287
2288         ehdr = (struct ethhdr *) rx->skb->data;
2289         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2290                 *port_control = true;
2291         else if (check_port_control)
2292                 return -1;
2293
2294         return 0;
2295 }
2296
2297 /*
2298  * requires that rx->skb is a frame with ethernet header
2299  */
2300 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2301 {
2302         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2303                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2304         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2305
2306         /*
2307          * Allow EAPOL frames to us/the PAE group address regardless of
2308          * whether the frame was encrypted or not, and always disallow
2309          * all other destination addresses for them.
2310          */
2311         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2312                 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2313                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2314
2315         if (ieee80211_802_1x_port_control(rx) ||
2316             ieee80211_drop_unencrypted(rx, fc))
2317                 return false;
2318
2319         return true;
2320 }
2321
2322 /*
2323  * requires that rx->skb is a frame with ethernet header
2324  */
2325 static void
2326 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2327 {
2328         struct ieee80211_sub_if_data *sdata = rx->sdata;
2329         struct net_device *dev = sdata->dev;
2330         struct sk_buff *skb, *xmit_skb;
2331         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2332         struct sta_info *dsta;
2333
2334         skb = rx->skb;
2335         xmit_skb = NULL;
2336
2337         ieee80211_rx_stats(dev, skb->len);
2338
2339         if (rx->sta) {
2340                 /* The seqno index has the same property as needed
2341                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2342                  * for non-QoS-data frames. Here we know it's a data
2343                  * frame, so count MSDUs.
2344                  */
2345                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2346                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2347                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2348         }
2349
2350         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2351              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2352             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2353             ehdr->h_proto != rx->sdata->control_port_protocol &&
2354             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2355                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2356                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2357                         /*
2358                          * send multicast frames both to higher layers in
2359                          * local net stack and back to the wireless medium
2360                          */
2361                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2362                         if (!xmit_skb)
2363                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2364                                                     dev->name);
2365                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2366                         dsta = sta_info_get(sdata, skb->data);
2367                         if (dsta) {
2368                                 /*
2369                                  * The destination station is associated to
2370                                  * this AP (in this VLAN), so send the frame
2371                                  * directly to it and do not pass it to local
2372                                  * net stack.
2373                                  */
2374                                 xmit_skb = skb;
2375                                 skb = NULL;
2376                         }
2377                 }
2378         }
2379
2380 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2381         if (skb) {
2382                 /* 'align' will only take the values 0 or 2 here since all
2383                  * frames are required to be aligned to 2-byte boundaries
2384                  * when being passed to mac80211; the code here works just
2385                  * as well if that isn't true, but mac80211 assumes it can
2386                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2387                  */
2388                 int align;
2389
2390                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2391                 if (align) {
2392                         if (WARN_ON(skb_headroom(skb) < 3)) {
2393                                 dev_kfree_skb(skb);
2394                                 skb = NULL;
2395                         } else {
2396                                 u8 *data = skb->data;
2397                                 size_t len = skb_headlen(skb);
2398                                 skb->data -= align;
2399                                 memmove(skb->data, data, len);
2400                                 skb_set_tail_pointer(skb, len);
2401                         }
2402                 }
2403         }
2404 #endif
2405
2406         if (skb) {
2407                 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
2408
2409                 /* deliver to local stack */
2410                 skb->protocol = eth_type_trans(skb, dev);
2411                 memset(skb->cb, 0, sizeof(skb->cb));
2412
2413                 /*
2414                  * 802.1X over 802.11 requires that the authenticator address
2415                  * be used for EAPOL frames. However, 802.1X allows the use of
2416                  * the PAE group address instead. If the interface is part of
2417                  * a bridge and we pass the frame with the PAE group address,
2418                  * then the bridge will forward it to the network (even if the
2419                  * client was not associated yet), which isn't supposed to
2420                  * happen.
2421                  * To avoid that, rewrite the destination address to our own
2422                  * address, so that the authenticator (e.g. hostapd) will see
2423                  * the frame, but bridge won't forward it anywhere else. Note
2424                  * that due to earlier filtering, the only other address can
2425                  * be the PAE group address.
2426                  */
2427                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2428                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2429                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2430
2431                 if (rx->napi)
2432                         napi_gro_receive(rx->napi, skb);
2433                 else
2434                         netif_receive_skb(skb);
2435         }
2436
2437         if (xmit_skb) {
2438                 /*
2439                  * Send to wireless media and increase priority by 256 to
2440                  * keep the received priority instead of reclassifying
2441                  * the frame (see cfg80211_classify8021d).
2442                  */
2443                 xmit_skb->priority += 256;
2444                 xmit_skb->protocol = htons(ETH_P_802_3);
2445                 skb_reset_network_header(xmit_skb);
2446                 skb_reset_mac_header(xmit_skb);
2447                 dev_queue_xmit(xmit_skb);
2448         }
2449 }
2450
2451 static ieee80211_rx_result debug_noinline
2452 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2453 {
2454         struct net_device *dev = rx->sdata->dev;
2455         struct sk_buff *skb = rx->skb;
2456         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2457         __le16 fc = hdr->frame_control;
2458         struct sk_buff_head frame_list;
2459         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2460         struct ethhdr ethhdr;
2461         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2462
2463         if (unlikely(!ieee80211_is_data(fc)))
2464                 return RX_CONTINUE;
2465
2466         if (unlikely(!ieee80211_is_data_present(fc)))
2467                 return RX_DROP_MONITOR;
2468
2469         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2470                 return RX_CONTINUE;
2471
2472         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2473                 switch (rx->sdata->vif.type) {
2474                 case NL80211_IFTYPE_AP_VLAN:
2475                         if (!rx->sdata->u.vlan.sta)
2476                                 return RX_DROP_UNUSABLE;
2477                         break;
2478                 case NL80211_IFTYPE_STATION:
2479                         if (!rx->sdata->u.mgd.use_4addr)
2480                                 return RX_DROP_UNUSABLE;
2481                         break;
2482                 default:
2483                         return RX_DROP_UNUSABLE;
2484                 }
2485                 check_da = NULL;
2486                 check_sa = NULL;
2487         } else switch (rx->sdata->vif.type) {
2488                 case NL80211_IFTYPE_AP:
2489                 case NL80211_IFTYPE_AP_VLAN:
2490                         check_da = NULL;
2491                         break;
2492                 case NL80211_IFTYPE_STATION:
2493                         if (!rx->sta ||
2494                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2495                                 check_sa = NULL;
2496                         break;
2497                 case NL80211_IFTYPE_MESH_POINT:
2498                         check_sa = NULL;
2499                         break;
2500                 default:
2501                         break;
2502         }
2503
2504         if (is_multicast_ether_addr(hdr->addr1))
2505                 return RX_DROP_UNUSABLE;
2506
2507         skb->dev = dev;
2508         __skb_queue_head_init(&frame_list);
2509
2510         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2511                                           rx->sdata->vif.addr,
2512                                           rx->sdata->vif.type,
2513                                           true))
2514                 return RX_DROP_UNUSABLE;
2515
2516         if (rx->key) {
2517                 /*
2518                  * We should not receive A-MSDUs on pre-HT connections,
2519                  * and HT connections cannot use old ciphers. Thus drop
2520                  * them, as in those cases we couldn't even have SPP
2521                  * A-MSDUs or such.
2522                  */
2523                 switch (rx->key->conf.cipher) {
2524                 case WLAN_CIPHER_SUITE_WEP40:
2525                 case WLAN_CIPHER_SUITE_WEP104:
2526                 case WLAN_CIPHER_SUITE_TKIP:
2527                         return RX_DROP_UNUSABLE;
2528                 default:
2529                         break;
2530                 }
2531         }
2532
2533         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2534                                  rx->sdata->vif.type,
2535                                  rx->local->hw.extra_tx_headroom,
2536                                  check_da, check_sa);
2537
2538         while (!skb_queue_empty(&frame_list)) {
2539                 rx->skb = __skb_dequeue(&frame_list);
2540
2541                 if (!ieee80211_frame_allowed(rx, fc)) {
2542                         dev_kfree_skb(rx->skb);
2543                         continue;
2544                 }
2545
2546                 ieee80211_deliver_skb(rx);
2547         }
2548
2549         return RX_QUEUED;
2550 }
2551
2552 #ifdef CONFIG_MAC80211_MESH
2553 static ieee80211_rx_result
2554 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2555 {
2556         struct ieee80211_hdr *fwd_hdr, *hdr;
2557         struct ieee80211_tx_info *info;
2558         struct ieee80211s_hdr *mesh_hdr;
2559         struct sk_buff *skb = rx->skb, *fwd_skb;
2560         struct ieee80211_local *local = rx->local;
2561         struct ieee80211_sub_if_data *sdata = rx->sdata;
2562         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2563         u16 ac, q, hdrlen;
2564
2565         hdr = (struct ieee80211_hdr *) skb->data;
2566         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2567
2568         /* make sure fixed part of mesh header is there, also checks skb len */
2569         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2570                 return RX_DROP_MONITOR;
2571
2572         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2573
2574         /* make sure full mesh header is there, also checks skb len */
2575         if (!pskb_may_pull(rx->skb,
2576                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2577                 return RX_DROP_MONITOR;
2578
2579         /* reload pointers */
2580         hdr = (struct ieee80211_hdr *) skb->data;
2581         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2582
2583         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2584                 return RX_DROP_MONITOR;
2585
2586         /* frame is in RMC, don't forward */
2587         if (ieee80211_is_data(hdr->frame_control) &&
2588             is_multicast_ether_addr(hdr->addr1) &&
2589             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2590                 return RX_DROP_MONITOR;
2591
2592         if (!ieee80211_is_data(hdr->frame_control))
2593                 return RX_CONTINUE;
2594
2595         if (!mesh_hdr->ttl)
2596                 return RX_DROP_MONITOR;
2597
2598         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2599                 struct mesh_path *mppath;
2600                 char *proxied_addr;
2601                 char *mpp_addr;
2602
2603                 if (is_multicast_ether_addr(hdr->addr1)) {
2604                         mpp_addr = hdr->addr3;
2605                         proxied_addr = mesh_hdr->eaddr1;
2606                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2607                             MESH_FLAGS_AE_A5_A6) {
2608                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2609                         mpp_addr = hdr->addr4;
2610                         proxied_addr = mesh_hdr->eaddr2;
2611                 } else {
2612                         return RX_DROP_MONITOR;
2613                 }
2614
2615                 rcu_read_lock();
2616                 mppath = mpp_path_lookup(sdata, proxied_addr);
2617                 if (!mppath) {
2618                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2619                 } else {
2620                         spin_lock_bh(&mppath->state_lock);
2621                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2622                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2623                         mppath->exp_time = jiffies;
2624                         spin_unlock_bh(&mppath->state_lock);
2625                 }
2626                 rcu_read_unlock();
2627         }
2628
2629         /* Frame has reached destination.  Don't forward */
2630         if (!is_multicast_ether_addr(hdr->addr1) &&
2631             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2632                 return RX_CONTINUE;
2633
2634         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2635         q = sdata->vif.hw_queue[ac];
2636         if (ieee80211_queue_stopped(&local->hw, q)) {
2637                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2638                 return RX_DROP_MONITOR;
2639         }
2640         skb_set_queue_mapping(skb, q);
2641
2642         if (!--mesh_hdr->ttl) {
2643                 if (!is_multicast_ether_addr(hdr->addr1))
2644                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2645                                                      dropped_frames_ttl);
2646                 goto out;
2647         }
2648
2649         if (!ifmsh->mshcfg.dot11MeshForwarding)
2650                 goto out;
2651
2652         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2653                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2654         if (!fwd_skb) {
2655                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2656                                     sdata->name);
2657                 goto out;
2658         }
2659
2660         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2661         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2662         info = IEEE80211_SKB_CB(fwd_skb);
2663         memset(info, 0, sizeof(*info));
2664         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2665         info->control.vif = &rx->sdata->vif;
2666         info->control.jiffies = jiffies;
2667         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2668                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2669                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2670                 /* update power mode indication when forwarding */
2671                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2672         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2673                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2674                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2675         } else {
2676                 /* unable to resolve next hop */
2677                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2678                                    fwd_hdr->addr3, 0,
2679                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2680                                    fwd_hdr->addr2);
2681                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2682                 kfree_skb(fwd_skb);
2683                 return RX_DROP_MONITOR;
2684         }
2685
2686         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2687         ieee80211_add_pending_skb(local, fwd_skb);
2688  out:
2689         if (is_multicast_ether_addr(hdr->addr1))
2690                 return RX_CONTINUE;
2691         return RX_DROP_MONITOR;
2692 }
2693 #endif
2694
2695 static ieee80211_rx_result debug_noinline
2696 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2697 {
2698         struct ieee80211_sub_if_data *sdata = rx->sdata;
2699         struct ieee80211_local *local = rx->local;
2700         struct net_device *dev = sdata->dev;
2701         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2702         __le16 fc = hdr->frame_control;
2703         bool port_control;
2704         int err;
2705
2706         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2707                 return RX_CONTINUE;
2708
2709         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2710                 return RX_DROP_MONITOR;
2711
2712         /*
2713          * Send unexpected-4addr-frame event to hostapd. For older versions,
2714          * also drop the frame to cooked monitor interfaces.
2715          */
2716         if (ieee80211_has_a4(hdr->frame_control) &&
2717             sdata->vif.type == NL80211_IFTYPE_AP) {
2718                 if (rx->sta &&
2719                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2720                         cfg80211_rx_unexpected_4addr_frame(
2721                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2722                 return RX_DROP_MONITOR;
2723         }
2724
2725         err = __ieee80211_data_to_8023(rx, &port_control);
2726         if (unlikely(err))
2727                 return RX_DROP_UNUSABLE;
2728
2729         if (!ieee80211_frame_allowed(rx, fc))
2730                 return RX_DROP_MONITOR;
2731
2732         /* directly handle TDLS channel switch requests/responses */
2733         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2734                                                 cpu_to_be16(ETH_P_TDLS))) {
2735                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2736
2737                 if (pskb_may_pull(rx->skb,
2738                                   offsetof(struct ieee80211_tdls_data, u)) &&
2739                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2740                     tf->category == WLAN_CATEGORY_TDLS &&
2741                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2742                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2743                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2744                         schedule_work(&local->tdls_chsw_work);
2745                         if (rx->sta)
2746                                 rx->sta->rx_stats.packets++;
2747
2748                         return RX_QUEUED;
2749                 }
2750         }
2751
2752         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2753             unlikely(port_control) && sdata->bss) {
2754                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2755                                      u.ap);
2756                 dev = sdata->dev;
2757                 rx->sdata = sdata;
2758         }
2759
2760         rx->skb->dev = dev;
2761
2762         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2763             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2764             !is_multicast_ether_addr(
2765                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2766             (!local->scanning &&
2767              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2768                 mod_timer(&local->dynamic_ps_timer, jiffies +
2769                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2770
2771         ieee80211_deliver_skb(rx);
2772
2773         return RX_QUEUED;
2774 }
2775
2776 static ieee80211_rx_result debug_noinline
2777 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2778 {
2779         struct sk_buff *skb = rx->skb;
2780         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2781         struct tid_ampdu_rx *tid_agg_rx;
2782         u16 start_seq_num;
2783         u16 tid;
2784
2785         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2786                 return RX_CONTINUE;
2787
2788         if (ieee80211_is_back_req(bar->frame_control)) {
2789                 struct {
2790                         __le16 control, start_seq_num;
2791                 } __packed bar_data;
2792                 struct ieee80211_event event = {
2793                         .type = BAR_RX_EVENT,
2794                 };
2795
2796                 if (!rx->sta)
2797                         return RX_DROP_MONITOR;
2798
2799                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2800                                   &bar_data, sizeof(bar_data)))
2801                         return RX_DROP_MONITOR;
2802
2803                 tid = le16_to_cpu(bar_data.control) >> 12;
2804
2805                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2806                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2807                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2808                                              WLAN_BACK_RECIPIENT,
2809                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2810
2811                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2812                 if (!tid_agg_rx)
2813                         return RX_DROP_MONITOR;
2814
2815                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2816                 event.u.ba.tid = tid;
2817                 event.u.ba.ssn = start_seq_num;
2818                 event.u.ba.sta = &rx->sta->sta;
2819
2820                 /* reset session timer */
2821                 if (tid_agg_rx->timeout)
2822                         mod_timer(&tid_agg_rx->session_timer,
2823                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2824
2825                 spin_lock(&tid_agg_rx->reorder_lock);
2826                 /* release stored frames up to start of BAR */
2827                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2828                                                  start_seq_num, frames);
2829                 spin_unlock(&tid_agg_rx->reorder_lock);
2830
2831                 drv_event_callback(rx->local, rx->sdata, &event);
2832
2833                 kfree_skb(skb);
2834                 return RX_QUEUED;
2835         }
2836
2837         /*
2838          * After this point, we only want management frames,
2839          * so we can drop all remaining control frames to
2840          * cooked monitor interfaces.
2841          */
2842         return RX_DROP_MONITOR;
2843 }
2844
2845 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2846                                            struct ieee80211_mgmt *mgmt,
2847                                            size_t len)
2848 {
2849         struct ieee80211_local *local = sdata->local;
2850         struct sk_buff *skb;
2851         struct ieee80211_mgmt *resp;
2852
2853         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2854                 /* Not to own unicast address */
2855                 return;
2856         }
2857
2858         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2859             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2860                 /* Not from the current AP or not associated yet. */
2861                 return;
2862         }
2863
2864         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2865                 /* Too short SA Query request frame */
2866                 return;
2867         }
2868
2869         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2870         if (skb == NULL)
2871                 return;
2872
2873         skb_reserve(skb, local->hw.extra_tx_headroom);
2874         resp = skb_put_zero(skb, 24);
2875         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2876         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2877         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2878         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2879                                           IEEE80211_STYPE_ACTION);
2880         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2881         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2882         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2883         memcpy(resp->u.action.u.sa_query.trans_id,
2884                mgmt->u.action.u.sa_query.trans_id,
2885                WLAN_SA_QUERY_TR_ID_LEN);
2886
2887         ieee80211_tx_skb(sdata, skb);
2888 }
2889
2890 static ieee80211_rx_result debug_noinline
2891 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2892 {
2893         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2894         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2895
2896         /*
2897          * From here on, look only at management frames.
2898          * Data and control frames are already handled,
2899          * and unknown (reserved) frames are useless.
2900          */
2901         if (rx->skb->len < 24)
2902                 return RX_DROP_MONITOR;
2903
2904         if (!ieee80211_is_mgmt(mgmt->frame_control))
2905                 return RX_DROP_MONITOR;
2906
2907         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2908             ieee80211_is_beacon(mgmt->frame_control) &&
2909             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2910                 int sig = 0;
2911
2912                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2913                         sig = status->signal;
2914
2915                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2916                                             rx->skb->data, rx->skb->len,
2917                                             status->freq, sig);
2918                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2919         }
2920
2921         if (ieee80211_drop_unencrypted_mgmt(rx))
2922                 return RX_DROP_UNUSABLE;
2923
2924         return RX_CONTINUE;
2925 }
2926
2927 static ieee80211_rx_result debug_noinline
2928 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2929 {
2930         struct ieee80211_local *local = rx->local;
2931         struct ieee80211_sub_if_data *sdata = rx->sdata;
2932         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2933         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2934         int len = rx->skb->len;
2935
2936         if (!ieee80211_is_action(mgmt->frame_control))
2937                 return RX_CONTINUE;
2938
2939         /* drop too small frames */
2940         if (len < IEEE80211_MIN_ACTION_SIZE)
2941                 return RX_DROP_UNUSABLE;
2942
2943         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2944             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2945             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2946                 return RX_DROP_UNUSABLE;
2947
2948         switch (mgmt->u.action.category) {
2949         case WLAN_CATEGORY_HT:
2950                 /* reject HT action frames from stations not supporting HT */
2951                 if (!rx->sta->sta.ht_cap.ht_supported)
2952                         goto invalid;
2953
2954                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2955                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2956                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2957                     sdata->vif.type != NL80211_IFTYPE_AP &&
2958                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2959                         break;
2960
2961                 /* verify action & smps_control/chanwidth are present */
2962                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2963                         goto invalid;
2964
2965                 switch (mgmt->u.action.u.ht_smps.action) {
2966                 case WLAN_HT_ACTION_SMPS: {
2967                         struct ieee80211_supported_band *sband;
2968                         enum ieee80211_smps_mode smps_mode;
2969
2970                         /* convert to HT capability */
2971                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2972                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2973                                 smps_mode = IEEE80211_SMPS_OFF;
2974                                 break;
2975                         case WLAN_HT_SMPS_CONTROL_STATIC:
2976                                 smps_mode = IEEE80211_SMPS_STATIC;
2977                                 break;
2978                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2979                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2980                                 break;
2981                         default:
2982                                 goto invalid;
2983                         }
2984
2985                         /* if no change do nothing */
2986                         if (rx->sta->sta.smps_mode == smps_mode)
2987                                 goto handled;
2988                         rx->sta->sta.smps_mode = smps_mode;
2989
2990                         sband = rx->local->hw.wiphy->bands[status->band];
2991
2992                         rate_control_rate_update(local, sband, rx->sta,
2993                                                  IEEE80211_RC_SMPS_CHANGED);
2994                         goto handled;
2995                 }
2996                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2997                         struct ieee80211_supported_band *sband;
2998                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2999                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3000
3001                         /* If it doesn't support 40 MHz it can't change ... */
3002                         if (!(rx->sta->sta.ht_cap.cap &
3003                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3004                                 goto handled;
3005
3006                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3007                                 max_bw = IEEE80211_STA_RX_BW_20;
3008                         else
3009                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3010
3011                         /* set cur_max_bandwidth and recalc sta bw */
3012                         rx->sta->cur_max_bandwidth = max_bw;
3013                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3014
3015                         if (rx->sta->sta.bandwidth == new_bw)
3016                                 goto handled;
3017
3018                         rx->sta->sta.bandwidth = new_bw;
3019                         sband = rx->local->hw.wiphy->bands[status->band];
3020
3021                         rate_control_rate_update(local, sband, rx->sta,
3022                                                  IEEE80211_RC_BW_CHANGED);
3023                         goto handled;
3024                 }
3025                 default:
3026                         goto invalid;
3027                 }
3028
3029                 break;
3030         case WLAN_CATEGORY_PUBLIC:
3031                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3032                         goto invalid;
3033                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3034                         break;
3035                 if (!rx->sta)
3036                         break;
3037                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3038                         break;
3039                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3040                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3041                         break;
3042                 if (len < offsetof(struct ieee80211_mgmt,
3043                                    u.action.u.ext_chan_switch.variable))
3044                         goto invalid;
3045                 goto queue;
3046         case WLAN_CATEGORY_VHT:
3047                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3048                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3049                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3050                     sdata->vif.type != NL80211_IFTYPE_AP &&
3051                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3052                         break;
3053
3054                 /* verify action code is present */
3055                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3056                         goto invalid;
3057
3058                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3059                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3060                         /* verify opmode is present */
3061                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3062                                 goto invalid;
3063                         goto queue;
3064                 }
3065                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3066                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3067                                 goto invalid;
3068                         goto queue;
3069                 }
3070                 default:
3071                         break;
3072                 }
3073                 break;
3074         case WLAN_CATEGORY_BACK:
3075                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3076                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3077                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3078                     sdata->vif.type != NL80211_IFTYPE_AP &&
3079                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3080                         break;
3081
3082                 /* verify action_code is present */
3083                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3084                         break;
3085
3086                 switch (mgmt->u.action.u.addba_req.action_code) {
3087                 case WLAN_ACTION_ADDBA_REQ:
3088                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3089                                    sizeof(mgmt->u.action.u.addba_req)))
3090                                 goto invalid;
3091                         break;
3092                 case WLAN_ACTION_ADDBA_RESP:
3093                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3094                                    sizeof(mgmt->u.action.u.addba_resp)))
3095                                 goto invalid;
3096                         break;
3097                 case WLAN_ACTION_DELBA:
3098                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3099                                    sizeof(mgmt->u.action.u.delba)))
3100                                 goto invalid;
3101                         break;
3102                 default:
3103                         goto invalid;
3104                 }
3105
3106                 goto queue;
3107         case WLAN_CATEGORY_SPECTRUM_MGMT:
3108                 /* verify action_code is present */
3109                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3110                         break;
3111
3112                 switch (mgmt->u.action.u.measurement.action_code) {
3113                 case WLAN_ACTION_SPCT_MSR_REQ:
3114                         if (status->band != NL80211_BAND_5GHZ)
3115                                 break;
3116
3117                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3118                                    sizeof(mgmt->u.action.u.measurement)))
3119                                 break;
3120
3121                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3122                                 break;
3123
3124                         ieee80211_process_measurement_req(sdata, mgmt, len);
3125                         goto handled;
3126                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3127                         u8 *bssid;
3128                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3129                                    sizeof(mgmt->u.action.u.chan_switch)))
3130                                 break;
3131
3132                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3133                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3134                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3135                                 break;
3136
3137                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3138                                 bssid = sdata->u.mgd.bssid;
3139                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3140                                 bssid = sdata->u.ibss.bssid;
3141                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3142                                 bssid = mgmt->sa;
3143                         else
3144                                 break;
3145
3146                         if (!ether_addr_equal(mgmt->bssid, bssid))
3147                                 break;
3148
3149                         goto queue;
3150                         }
3151                 }
3152                 break;
3153         case WLAN_CATEGORY_SA_QUERY:
3154                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3155                            sizeof(mgmt->u.action.u.sa_query)))
3156                         break;
3157
3158                 switch (mgmt->u.action.u.sa_query.action) {
3159                 case WLAN_ACTION_SA_QUERY_REQUEST:
3160                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3161                                 break;
3162                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3163                         goto handled;
3164                 }
3165                 break;
3166         case WLAN_CATEGORY_SELF_PROTECTED:
3167                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3168                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3169                         break;
3170
3171                 switch (mgmt->u.action.u.self_prot.action_code) {
3172                 case WLAN_SP_MESH_PEERING_OPEN:
3173                 case WLAN_SP_MESH_PEERING_CLOSE:
3174                 case WLAN_SP_MESH_PEERING_CONFIRM:
3175                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3176                                 goto invalid;
3177                         if (sdata->u.mesh.user_mpm)
3178                                 /* userspace handles this frame */
3179                                 break;
3180                         goto queue;
3181                 case WLAN_SP_MGK_INFORM:
3182                 case WLAN_SP_MGK_ACK:
3183                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3184                                 goto invalid;
3185                         break;
3186                 }
3187                 break;
3188         case WLAN_CATEGORY_MESH_ACTION:
3189                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3190                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3191                         break;
3192
3193                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3194                         break;
3195                 if (mesh_action_is_path_sel(mgmt) &&
3196                     !mesh_path_sel_is_hwmp(sdata))
3197                         break;
3198                 goto queue;
3199         }
3200
3201         return RX_CONTINUE;
3202
3203  invalid:
3204         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3205         /* will return in the next handlers */
3206         return RX_CONTINUE;
3207
3208  handled:
3209         if (rx->sta)
3210                 rx->sta->rx_stats.packets++;
3211         dev_kfree_skb(rx->skb);
3212         return RX_QUEUED;
3213
3214  queue:
3215         skb_queue_tail(&sdata->skb_queue, rx->skb);
3216         ieee80211_queue_work(&local->hw, &sdata->work);
3217         if (rx->sta)
3218                 rx->sta->rx_stats.packets++;
3219         return RX_QUEUED;
3220 }
3221
3222 static ieee80211_rx_result debug_noinline
3223 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3224 {
3225         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3226         int sig = 0;
3227
3228         /* skip known-bad action frames and return them in the next handler */
3229         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3230                 return RX_CONTINUE;
3231
3232         /*
3233          * Getting here means the kernel doesn't know how to handle
3234          * it, but maybe userspace does ... include returned frames
3235          * so userspace can register for those to know whether ones
3236          * it transmitted were processed or returned.
3237          */
3238
3239         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3240                 sig = status->signal;
3241
3242         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3243                              rx->skb->data, rx->skb->len, 0)) {
3244                 if (rx->sta)
3245                         rx->sta->rx_stats.packets++;
3246                 dev_kfree_skb(rx->skb);
3247                 return RX_QUEUED;
3248         }
3249
3250         return RX_CONTINUE;
3251 }
3252
3253 static ieee80211_rx_result debug_noinline
3254 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3255 {
3256         struct ieee80211_local *local = rx->local;
3257         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3258         struct sk_buff *nskb;
3259         struct ieee80211_sub_if_data *sdata = rx->sdata;
3260         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3261
3262         if (!ieee80211_is_action(mgmt->frame_control))
3263                 return RX_CONTINUE;
3264
3265         /*
3266          * For AP mode, hostapd is responsible for handling any action
3267          * frames that we didn't handle, including returning unknown
3268          * ones. For all other modes we will return them to the sender,
3269          * setting the 0x80 bit in the action category, as required by
3270          * 802.11-2012 9.24.4.
3271          * Newer versions of hostapd shall also use the management frame
3272          * registration mechanisms, but older ones still use cooked
3273          * monitor interfaces so push all frames there.
3274          */
3275         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3276             (sdata->vif.type == NL80211_IFTYPE_AP ||
3277              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3278                 return RX_DROP_MONITOR;
3279
3280         if (is_multicast_ether_addr(mgmt->da))
3281                 return RX_DROP_MONITOR;
3282
3283         /* do not return rejected action frames */
3284         if (mgmt->u.action.category & 0x80)
3285                 return RX_DROP_UNUSABLE;
3286
3287         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3288                                GFP_ATOMIC);
3289         if (nskb) {
3290                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3291
3292                 nmgmt->u.action.category |= 0x80;
3293                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3294                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3295
3296                 memset(nskb->cb, 0, sizeof(nskb->cb));
3297
3298                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3299                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3300
3301                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3302                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3303                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3304                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3305                                 info->hw_queue =
3306                                         local->hw.offchannel_tx_hw_queue;
3307                 }
3308
3309                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3310                                             status->band);
3311         }
3312         dev_kfree_skb(rx->skb);
3313         return RX_QUEUED;
3314 }
3315
3316 static ieee80211_rx_result debug_noinline
3317 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3318 {
3319         struct ieee80211_sub_if_data *sdata = rx->sdata;
3320         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3321         __le16 stype;
3322
3323         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3324
3325         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3326             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3327             sdata->vif.type != NL80211_IFTYPE_OCB &&
3328             sdata->vif.type != NL80211_IFTYPE_STATION)
3329                 return RX_DROP_MONITOR;
3330
3331         switch (stype) {
3332         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3333         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3334         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3335                 /* process for all: mesh, mlme, ibss */
3336                 break;
3337         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3338                 if (is_multicast_ether_addr(mgmt->da) &&
3339                     !is_broadcast_ether_addr(mgmt->da))
3340                         return RX_DROP_MONITOR;
3341
3342                 /* process only for station/IBSS */
3343                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3344                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3345                         return RX_DROP_MONITOR;
3346                 break;
3347         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3348         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3349         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3350                 if (is_multicast_ether_addr(mgmt->da) &&
3351                     !is_broadcast_ether_addr(mgmt->da))
3352                         return RX_DROP_MONITOR;
3353
3354                 /* process only for station */
3355                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3356                         return RX_DROP_MONITOR;
3357                 break;
3358         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3359                 /* process only for ibss and mesh */
3360                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3361                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3362                         return RX_DROP_MONITOR;
3363                 break;
3364         default:
3365                 return RX_DROP_MONITOR;
3366         }
3367
3368         /* queue up frame and kick off work to process it */
3369         skb_queue_tail(&sdata->skb_queue, rx->skb);
3370         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3371         if (rx->sta)
3372                 rx->sta->rx_stats.packets++;
3373
3374         return RX_QUEUED;
3375 }
3376
3377 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3378                                         struct ieee80211_rate *rate)
3379 {
3380         struct ieee80211_sub_if_data *sdata;
3381         struct ieee80211_local *local = rx->local;
3382         struct sk_buff *skb = rx->skb, *skb2;
3383         struct net_device *prev_dev = NULL;
3384         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3385         int needed_headroom;
3386
3387         /*
3388          * If cooked monitor has been processed already, then
3389          * don't do it again. If not, set the flag.
3390          */
3391         if (rx->flags & IEEE80211_RX_CMNTR)
3392                 goto out_free_skb;
3393         rx->flags |= IEEE80211_RX_CMNTR;
3394
3395         /* If there are no cooked monitor interfaces, just free the SKB */
3396         if (!local->cooked_mntrs)
3397                 goto out_free_skb;
3398
3399         /* vendor data is long removed here */
3400         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3401         /* room for the radiotap header based on driver features */
3402         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3403
3404         if (skb_headroom(skb) < needed_headroom &&
3405             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3406                 goto out_free_skb;
3407
3408         /* prepend radiotap information */
3409         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3410                                          false);
3411
3412         skb_reset_mac_header(skb);
3413         skb->ip_summed = CHECKSUM_UNNECESSARY;
3414         skb->pkt_type = PACKET_OTHERHOST;
3415         skb->protocol = htons(ETH_P_802_2);
3416
3417         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3418                 if (!ieee80211_sdata_running(sdata))
3419                         continue;
3420
3421                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3422                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3423                         continue;
3424
3425                 if (prev_dev) {
3426                         skb2 = skb_clone(skb, GFP_ATOMIC);
3427                         if (skb2) {
3428                                 skb2->dev = prev_dev;
3429                                 netif_receive_skb(skb2);
3430                         }
3431                 }
3432
3433                 prev_dev = sdata->dev;
3434                 ieee80211_rx_stats(sdata->dev, skb->len);
3435         }
3436
3437         if (prev_dev) {
3438                 skb->dev = prev_dev;
3439                 netif_receive_skb(skb);
3440                 return;
3441         }
3442
3443  out_free_skb:
3444         dev_kfree_skb(skb);
3445 }
3446
3447 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3448                                          ieee80211_rx_result res)
3449 {
3450         switch (res) {
3451         case RX_DROP_MONITOR:
3452                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3453                 if (rx->sta)
3454                         rx->sta->rx_stats.dropped++;
3455                 /* fall through */
3456         case RX_CONTINUE: {
3457                 struct ieee80211_rate *rate = NULL;
3458                 struct ieee80211_supported_band *sband;
3459                 struct ieee80211_rx_status *status;
3460
3461                 status = IEEE80211_SKB_RXCB((rx->skb));
3462
3463                 sband = rx->local->hw.wiphy->bands[status->band];
3464                 if (!(status->encoding == RX_ENC_HT) &&
3465                     !(status->encoding == RX_ENC_VHT))
3466                         rate = &sband->bitrates[status->rate_idx];
3467
3468                 ieee80211_rx_cooked_monitor(rx, rate);
3469                 break;
3470                 }
3471         case RX_DROP_UNUSABLE:
3472                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3473                 if (rx->sta)
3474                         rx->sta->rx_stats.dropped++;
3475                 dev_kfree_skb(rx->skb);
3476                 break;
3477         case RX_QUEUED:
3478                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3479                 break;
3480         }
3481 }
3482
3483 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3484                                   struct sk_buff_head *frames)
3485 {
3486         ieee80211_rx_result res = RX_DROP_MONITOR;
3487         struct sk_buff *skb;
3488
3489 #define CALL_RXH(rxh)                   \
3490         do {                            \
3491                 res = rxh(rx);          \
3492                 if (res != RX_CONTINUE) \
3493                         goto rxh_next;  \
3494         } while (0)
3495
3496         /* Lock here to avoid hitting all of the data used in the RX
3497          * path (e.g. key data, station data, ...) concurrently when
3498          * a frame is released from the reorder buffer due to timeout
3499          * from the timer, potentially concurrently with RX from the
3500          * driver.
3501          */
3502         spin_lock_bh(&rx->local->rx_path_lock);
3503
3504         while ((skb = __skb_dequeue(frames))) {
3505                 /*
3506                  * all the other fields are valid across frames
3507                  * that belong to an aMPDU since they are on the
3508                  * same TID from the same station
3509                  */
3510                 rx->skb = skb;
3511
3512                 CALL_RXH(ieee80211_rx_h_check_more_data);
3513                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3514                 CALL_RXH(ieee80211_rx_h_sta_process);
3515                 CALL_RXH(ieee80211_rx_h_decrypt);
3516                 CALL_RXH(ieee80211_rx_h_defragment);
3517                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3518                 /* must be after MMIC verify so header is counted in MPDU mic */
3519 #ifdef CONFIG_MAC80211_MESH
3520                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3521                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3522 #endif
3523                 CALL_RXH(ieee80211_rx_h_amsdu);
3524                 CALL_RXH(ieee80211_rx_h_data);
3525
3526                 /* special treatment -- needs the queue */
3527                 res = ieee80211_rx_h_ctrl(rx, frames);
3528                 if (res != RX_CONTINUE)
3529                         goto rxh_next;
3530
3531                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3532                 CALL_RXH(ieee80211_rx_h_action);
3533                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3534                 CALL_RXH(ieee80211_rx_h_action_return);
3535                 CALL_RXH(ieee80211_rx_h_mgmt);
3536
3537  rxh_next:
3538                 ieee80211_rx_handlers_result(rx, res);
3539
3540 #undef CALL_RXH
3541         }
3542
3543         spin_unlock_bh(&rx->local->rx_path_lock);
3544 }
3545
3546 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3547 {
3548         struct sk_buff_head reorder_release;
3549         ieee80211_rx_result res = RX_DROP_MONITOR;
3550
3551         __skb_queue_head_init(&reorder_release);
3552
3553 #define CALL_RXH(rxh)                   \
3554         do {                            \
3555                 res = rxh(rx);          \
3556                 if (res != RX_CONTINUE) \
3557                         goto rxh_next;  \
3558         } while (0)
3559
3560         CALL_RXH(ieee80211_rx_h_check_dup);
3561         CALL_RXH(ieee80211_rx_h_check);
3562
3563         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3564
3565         ieee80211_rx_handlers(rx, &reorder_release);
3566         return;
3567
3568  rxh_next:
3569         ieee80211_rx_handlers_result(rx, res);
3570
3571 #undef CALL_RXH
3572 }
3573
3574 /*
3575  * This function makes calls into the RX path, therefore
3576  * it has to be invoked under RCU read lock.
3577  */
3578 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3579 {
3580         struct sk_buff_head frames;
3581         struct ieee80211_rx_data rx = {
3582                 .sta = sta,
3583                 .sdata = sta->sdata,
3584                 .local = sta->local,
3585                 /* This is OK -- must be QoS data frame */
3586                 .security_idx = tid,
3587                 .seqno_idx = tid,
3588                 .napi = NULL, /* must be NULL to not have races */
3589         };
3590         struct tid_ampdu_rx *tid_agg_rx;
3591
3592         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3593         if (!tid_agg_rx)
3594                 return;
3595
3596         __skb_queue_head_init(&frames);
3597
3598         spin_lock(&tid_agg_rx->reorder_lock);
3599         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3600         spin_unlock(&tid_agg_rx->reorder_lock);
3601
3602         if (!skb_queue_empty(&frames)) {
3603                 struct ieee80211_event event = {
3604                         .type = BA_FRAME_TIMEOUT,
3605                         .u.ba.tid = tid,
3606                         .u.ba.sta = &sta->sta,
3607                 };
3608                 drv_event_callback(rx.local, rx.sdata, &event);
3609         }
3610
3611         ieee80211_rx_handlers(&rx, &frames);
3612 }
3613
3614 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3615                                           u16 ssn, u64 filtered,
3616                                           u16 received_mpdus)
3617 {
3618         struct sta_info *sta;
3619         struct tid_ampdu_rx *tid_agg_rx;
3620         struct sk_buff_head frames;
3621         struct ieee80211_rx_data rx = {
3622                 /* This is OK -- must be QoS data frame */
3623                 .security_idx = tid,
3624                 .seqno_idx = tid,
3625         };
3626         int i, diff;
3627
3628         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3629                 return;
3630
3631         __skb_queue_head_init(&frames);
3632
3633         sta = container_of(pubsta, struct sta_info, sta);
3634
3635         rx.sta = sta;
3636         rx.sdata = sta->sdata;
3637         rx.local = sta->local;
3638
3639         rcu_read_lock();
3640         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3641         if (!tid_agg_rx)
3642                 goto out;
3643
3644         spin_lock_bh(&tid_agg_rx->reorder_lock);
3645
3646         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3647                 int release;
3648
3649                 /* release all frames in the reorder buffer */
3650                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3651                            IEEE80211_SN_MODULO;
3652                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3653                                                  release, &frames);
3654                 /* update ssn to match received ssn */
3655                 tid_agg_rx->head_seq_num = ssn;
3656         } else {
3657                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3658                                                  &frames);
3659         }
3660
3661         /* handle the case that received ssn is behind the mac ssn.
3662          * it can be tid_agg_rx->buf_size behind and still be valid */
3663         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3664         if (diff >= tid_agg_rx->buf_size) {
3665                 tid_agg_rx->reorder_buf_filtered = 0;
3666                 goto release;
3667         }
3668         filtered = filtered >> diff;
3669         ssn += diff;
3670
3671         /* update bitmap */
3672         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3673                 int index = (ssn + i) % tid_agg_rx->buf_size;
3674
3675                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3676                 if (filtered & BIT_ULL(i))
3677                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3678         }
3679
3680         /* now process also frames that the filter marking released */
3681         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3682
3683 release:
3684         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3685
3686         ieee80211_rx_handlers(&rx, &frames);
3687
3688  out:
3689         rcu_read_unlock();
3690 }
3691 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3692
3693 /* main receive path */
3694
3695 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3696 {
3697         struct ieee80211_sub_if_data *sdata = rx->sdata;
3698         struct sk_buff *skb = rx->skb;
3699         struct ieee80211_hdr *hdr = (void *)skb->data;
3700         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3701         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3702         bool multicast = is_multicast_ether_addr(hdr->addr1);
3703
3704         switch (sdata->vif.type) {
3705         case NL80211_IFTYPE_STATION:
3706                 if (!bssid && !sdata->u.mgd.use_4addr)
3707                         return false;
3708                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3709                         return false;
3710                 if (multicast)
3711                         return true;
3712                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3713         case NL80211_IFTYPE_ADHOC:
3714                 if (!bssid)
3715                         return false;
3716                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3717                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
3718                     !is_valid_ether_addr(hdr->addr2))
3719                         return false;
3720                 if (ieee80211_is_beacon(hdr->frame_control))
3721                         return true;
3722                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3723                         return false;
3724                 if (!multicast &&
3725                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3726                         return false;
3727                 if (!rx->sta) {
3728                         int rate_idx;
3729                         if (status->encoding != RX_ENC_LEGACY)
3730                                 rate_idx = 0; /* TODO: HT/VHT rates */
3731                         else
3732                                 rate_idx = status->rate_idx;
3733                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3734                                                  BIT(rate_idx));
3735                 }
3736                 return true;
3737         case NL80211_IFTYPE_OCB:
3738                 if (!bssid)
3739                         return false;
3740                 if (!ieee80211_is_data_present(hdr->frame_control))
3741                         return false;
3742                 if (!is_broadcast_ether_addr(bssid))
3743                         return false;
3744                 if (!multicast &&
3745                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3746                         return false;
3747                 if (!rx->sta) {
3748                         int rate_idx;
3749                         if (status->encoding != RX_ENC_LEGACY)
3750                                 rate_idx = 0; /* TODO: HT rates */
3751                         else
3752                                 rate_idx = status->rate_idx;
3753                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3754                                                 BIT(rate_idx));
3755                 }
3756                 return true;
3757         case NL80211_IFTYPE_MESH_POINT:
3758                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3759                         return false;
3760                 if (multicast)
3761                         return true;
3762                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3763         case NL80211_IFTYPE_AP_VLAN:
3764         case NL80211_IFTYPE_AP:
3765                 if (!bssid)
3766                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3767
3768                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3769                         /*
3770                          * Accept public action frames even when the
3771                          * BSSID doesn't match, this is used for P2P
3772                          * and location updates. Note that mac80211
3773                          * itself never looks at these frames.
3774                          */
3775                         if (!multicast &&
3776                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3777                                 return false;
3778                         if (ieee80211_is_public_action(hdr, skb->len))
3779                                 return true;
3780                         return ieee80211_is_beacon(hdr->frame_control);
3781                 }
3782
3783                 if (!ieee80211_has_tods(hdr->frame_control)) {
3784                         /* ignore data frames to TDLS-peers */
3785                         if (ieee80211_is_data(hdr->frame_control))
3786                                 return false;
3787                         /* ignore action frames to TDLS-peers */
3788                         if (ieee80211_is_action(hdr->frame_control) &&
3789                             !is_broadcast_ether_addr(bssid) &&
3790                             !ether_addr_equal(bssid, hdr->addr1))
3791                                 return false;
3792                 }
3793
3794                 /*
3795                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3796                  * the BSSID - we've checked that already but may have accepted
3797                  * the wildcard (ff:ff:ff:ff:ff:ff).
3798                  *
3799                  * It also says:
3800                  *      The BSSID of the Data frame is determined as follows:
3801                  *      a) If the STA is contained within an AP or is associated
3802                  *         with an AP, the BSSID is the address currently in use
3803                  *         by the STA contained in the AP.
3804                  *
3805                  * So we should not accept data frames with an address that's
3806                  * multicast.
3807                  *
3808                  * Accepting it also opens a security problem because stations
3809                  * could encrypt it with the GTK and inject traffic that way.
3810                  */
3811                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3812                         return false;
3813
3814                 return true;
3815         case NL80211_IFTYPE_WDS:
3816                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3817                         return false;
3818                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3819         case NL80211_IFTYPE_P2P_DEVICE:
3820                 return ieee80211_is_public_action(hdr, skb->len) ||
3821                        ieee80211_is_probe_req(hdr->frame_control) ||
3822                        ieee80211_is_probe_resp(hdr->frame_control) ||
3823                        ieee80211_is_beacon(hdr->frame_control);
3824         case NL80211_IFTYPE_NAN:
3825                 /* Currently no frames on NAN interface are allowed */
3826                 return false;
3827         default:
3828                 break;
3829         }
3830
3831         WARN_ON_ONCE(1);
3832         return false;
3833 }
3834
3835 void ieee80211_check_fast_rx(struct sta_info *sta)
3836 {
3837         struct ieee80211_sub_if_data *sdata = sta->sdata;
3838         struct ieee80211_local *local = sdata->local;
3839         struct ieee80211_key *key;
3840         struct ieee80211_fast_rx fastrx = {
3841                 .dev = sdata->dev,
3842                 .vif_type = sdata->vif.type,
3843                 .control_port_protocol = sdata->control_port_protocol,
3844         }, *old, *new = NULL;
3845         bool assign = false;
3846
3847         /* use sparse to check that we don't return without updating */
3848         __acquire(check_fast_rx);
3849
3850         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3851         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3852         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3853         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3854
3855         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3856
3857         /* fast-rx doesn't do reordering */
3858         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3859             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3860                 goto clear;
3861
3862         switch (sdata->vif.type) {
3863         case NL80211_IFTYPE_STATION:
3864                 /* 4-addr is harder to deal with, later maybe */
3865                 if (sdata->u.mgd.use_4addr)
3866                         goto clear;
3867                 /* software powersave is a huge mess, avoid all of it */
3868                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3869                         goto clear;
3870                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3871                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3872                         goto clear;
3873                 if (sta->sta.tdls) {
3874                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3875                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3876                         fastrx.expected_ds_bits = 0;
3877                 } else {
3878                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3879                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3880                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3881                         fastrx.expected_ds_bits =
3882                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3883                 }
3884                 break;
3885         case NL80211_IFTYPE_AP_VLAN:
3886         case NL80211_IFTYPE_AP:
3887                 /* parallel-rx requires this, at least with calls to
3888                  * ieee80211_sta_ps_transition()
3889                  */
3890                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3891                         goto clear;
3892                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3893                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3894                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3895
3896                 fastrx.internal_forward =
3897                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3898                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3899                          !sdata->u.vlan.sta);
3900                 break;
3901         default:
3902                 goto clear;
3903         }
3904
3905         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3906                 goto clear;
3907
3908         rcu_read_lock();
3909         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3910         if (!key)
3911                 key = rcu_dereference(sdata->default_unicast_key);
3912         if (key) {
3913                 switch (key->conf.cipher) {
3914                 case WLAN_CIPHER_SUITE_TKIP:
3915                         /* we don't want to deal with MMIC in fast-rx */
3916                         goto clear_rcu;
3917                 case WLAN_CIPHER_SUITE_CCMP:
3918                 case WLAN_CIPHER_SUITE_CCMP_256:
3919                 case WLAN_CIPHER_SUITE_GCMP:
3920                 case WLAN_CIPHER_SUITE_GCMP_256:
3921                         break;
3922                 default:
3923                         /* we also don't want to deal with WEP or cipher scheme
3924                          * since those require looking up the key idx in the
3925                          * frame, rather than assuming the PTK is used
3926                          * (we need to revisit this once we implement the real
3927                          * PTK index, which is now valid in the spec, but we
3928                          * haven't implemented that part yet)
3929                          */
3930                         goto clear_rcu;
3931                 }
3932
3933                 fastrx.key = true;
3934                 fastrx.icv_len = key->conf.icv_len;
3935         }
3936
3937         assign = true;
3938  clear_rcu:
3939         rcu_read_unlock();
3940  clear:
3941         __release(check_fast_rx);
3942
3943         if (assign)
3944                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3945
3946         spin_lock_bh(&sta->lock);
3947         old = rcu_dereference_protected(sta->fast_rx, true);
3948         rcu_assign_pointer(sta->fast_rx, new);
3949         spin_unlock_bh(&sta->lock);
3950
3951         if (old)
3952                 kfree_rcu(old, rcu_head);
3953 }
3954
3955 void ieee80211_clear_fast_rx(struct sta_info *sta)
3956 {
3957         struct ieee80211_fast_rx *old;
3958
3959         spin_lock_bh(&sta->lock);
3960         old = rcu_dereference_protected(sta->fast_rx, true);
3961         RCU_INIT_POINTER(sta->fast_rx, NULL);
3962         spin_unlock_bh(&sta->lock);
3963
3964         if (old)
3965                 kfree_rcu(old, rcu_head);
3966 }
3967
3968 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3969 {
3970         struct ieee80211_local *local = sdata->local;
3971         struct sta_info *sta;
3972
3973         lockdep_assert_held(&local->sta_mtx);
3974
3975         list_for_each_entry(sta, &local->sta_list, list) {
3976                 if (sdata != sta->sdata &&
3977                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3978                         continue;
3979                 ieee80211_check_fast_rx(sta);
3980         }
3981 }
3982
3983 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3984 {
3985         struct ieee80211_local *local = sdata->local;
3986
3987         mutex_lock(&local->sta_mtx);
3988         __ieee80211_check_fast_rx_iface(sdata);
3989         mutex_unlock(&local->sta_mtx);
3990 }
3991
3992 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3993                                      struct ieee80211_fast_rx *fast_rx)
3994 {
3995         struct sk_buff *skb = rx->skb;
3996         struct ieee80211_hdr *hdr = (void *)skb->data;
3997         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3998         struct sta_info *sta = rx->sta;
3999         int orig_len = skb->len;
4000         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
4001         struct {
4002                 u8 snap[sizeof(rfc1042_header)];
4003                 __be16 proto;
4004         } *payload __aligned(2);
4005         struct {
4006                 u8 da[ETH_ALEN];
4007                 u8 sa[ETH_ALEN];
4008         } addrs __aligned(2);
4009         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4010
4011         if (fast_rx->uses_rss)
4012                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4013
4014         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4015          * to a common data structure; drivers can implement that per queue
4016          * but we don't have that information in mac80211
4017          */
4018         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4019                 return false;
4020
4021 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4022
4023         /* If using encryption, we also need to have:
4024          *  - PN_VALIDATED: similar, but the implementation is tricky
4025          *  - DECRYPTED: necessary for PN_VALIDATED
4026          */
4027         if (fast_rx->key &&
4028             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4029                 return false;
4030
4031         /* we don't deal with A-MSDU deaggregation here */
4032         if (status->rx_flags & IEEE80211_RX_AMSDU)
4033                 return false;
4034
4035         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4036                 return false;
4037
4038         if (unlikely(ieee80211_is_frag(hdr)))
4039                 return false;
4040
4041         /* Since our interface address cannot be multicast, this
4042          * implicitly also rejects multicast frames without the
4043          * explicit check.
4044          *
4045          * We shouldn't get any *data* frames not addressed to us
4046          * (AP mode will accept multicast *management* frames), but
4047          * punting here will make it go through the full checks in
4048          * ieee80211_accept_frame().
4049          */
4050         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4051                 return false;
4052
4053         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4054                                               IEEE80211_FCTL_TODS)) !=
4055             fast_rx->expected_ds_bits)
4056                 return false;
4057
4058         /* assign the key to drop unencrypted frames (later)
4059          * and strip the IV/MIC if necessary
4060          */
4061         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4062                 /* GCMP header length is the same */
4063                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4064         }
4065
4066         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4067                 goto drop;
4068         payload = (void *)(skb->data + snap_offs);
4069
4070         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4071                 return false;
4072
4073         /* Don't handle these here since they require special code.
4074          * Accept AARP and IPX even though they should come with a
4075          * bridge-tunnel header - but if we get them this way then
4076          * there's little point in discarding them.
4077          */
4078         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4079                      payload->proto == fast_rx->control_port_protocol))
4080                 return false;
4081
4082         /* after this point, don't punt to the slowpath! */
4083
4084         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4085             pskb_trim(skb, skb->len - fast_rx->icv_len))
4086                 goto drop;
4087
4088         if (unlikely(fast_rx->sta_notify)) {
4089                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4090                 fast_rx->sta_notify = false;
4091         }
4092
4093         /* statistics part of ieee80211_rx_h_sta_process() */
4094         stats->last_rx = jiffies;
4095         stats->last_rate = sta_stats_encode_rate(status);
4096
4097         stats->fragments++;
4098         stats->packets++;
4099
4100         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4101                 stats->last_signal = status->signal;
4102                 if (!fast_rx->uses_rss)
4103                         ewma_signal_add(&sta->rx_stats_avg.signal,
4104                                         -status->signal);
4105         }
4106
4107         if (status->chains) {
4108                 int i;
4109
4110                 stats->chains = status->chains;
4111                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4112                         int signal = status->chain_signal[i];
4113
4114                         if (!(status->chains & BIT(i)))
4115                                 continue;
4116
4117                         stats->chain_signal_last[i] = signal;
4118                         if (!fast_rx->uses_rss)
4119                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4120                                                 -signal);
4121                 }
4122         }
4123         /* end of statistics */
4124
4125         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4126                 goto drop;
4127
4128         /* do the header conversion - first grab the addresses */
4129         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4130         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4131         /* remove the SNAP but leave the ethertype */
4132         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4133         /* push the addresses in front */
4134         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4135
4136         skb->dev = fast_rx->dev;
4137
4138         ieee80211_rx_stats(fast_rx->dev, skb->len);
4139
4140         /* The seqno index has the same property as needed
4141          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4142          * for non-QoS-data frames. Here we know it's a data
4143          * frame, so count MSDUs.
4144          */
4145         u64_stats_update_begin(&stats->syncp);
4146         stats->msdu[rx->seqno_idx]++;
4147         stats->bytes += orig_len;
4148         u64_stats_update_end(&stats->syncp);
4149
4150         if (fast_rx->internal_forward) {
4151                 struct sk_buff *xmit_skb = NULL;
4152                 bool multicast = is_multicast_ether_addr(skb->data);
4153
4154                 if (multicast) {
4155                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4156                 } else if (sta_info_get(rx->sdata, skb->data)) {
4157                         xmit_skb = skb;
4158                         skb = NULL;
4159                 }
4160
4161                 if (xmit_skb) {
4162                         /*
4163                          * Send to wireless media and increase priority by 256
4164                          * to keep the received priority instead of
4165                          * reclassifying the frame (see cfg80211_classify8021d).
4166                          */
4167                         xmit_skb->priority += 256;
4168                         xmit_skb->protocol = htons(ETH_P_802_3);
4169                         skb_reset_network_header(xmit_skb);
4170                         skb_reset_mac_header(xmit_skb);
4171                         dev_queue_xmit(xmit_skb);
4172                 }
4173
4174                 if (!skb)
4175                         return true;
4176         }
4177
4178         /* deliver to local stack */
4179         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4180         memset(skb->cb, 0, sizeof(skb->cb));
4181         if (rx->napi)
4182                 napi_gro_receive(rx->napi, skb);
4183         else
4184                 netif_receive_skb(skb);
4185
4186         return true;
4187  drop:
4188         dev_kfree_skb(skb);
4189         stats->dropped++;
4190         return true;
4191 }
4192
4193 /*
4194  * This function returns whether or not the SKB
4195  * was destined for RX processing or not, which,
4196  * if consume is true, is equivalent to whether
4197  * or not the skb was consumed.
4198  */
4199 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4200                                             struct sk_buff *skb, bool consume)
4201 {
4202         struct ieee80211_local *local = rx->local;
4203         struct ieee80211_sub_if_data *sdata = rx->sdata;
4204
4205         rx->skb = skb;
4206
4207         /* See if we can do fast-rx; if we have to copy we already lost,
4208          * so punt in that case. We should never have to deliver a data
4209          * frame to multiple interfaces anyway.
4210          *
4211          * We skip the ieee80211_accept_frame() call and do the necessary
4212          * checking inside ieee80211_invoke_fast_rx().
4213          */
4214         if (consume && rx->sta) {
4215                 struct ieee80211_fast_rx *fast_rx;
4216
4217                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4218                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4219                         return true;
4220         }
4221
4222         if (!ieee80211_accept_frame(rx))
4223                 return false;
4224
4225         if (!consume) {
4226                 skb = skb_copy(skb, GFP_ATOMIC);
4227                 if (!skb) {
4228                         if (net_ratelimit())
4229                                 wiphy_debug(local->hw.wiphy,
4230                                         "failed to copy skb for %s\n",
4231                                         sdata->name);
4232                         return true;
4233                 }
4234
4235                 rx->skb = skb;
4236         }
4237
4238         ieee80211_invoke_rx_handlers(rx);
4239         return true;
4240 }
4241
4242 /*
4243  * This is the actual Rx frames handler. as it belongs to Rx path it must
4244  * be called with rcu_read_lock protection.
4245  */
4246 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4247                                          struct ieee80211_sta *pubsta,
4248                                          struct sk_buff *skb,
4249                                          struct napi_struct *napi)
4250 {
4251         struct ieee80211_local *local = hw_to_local(hw);
4252         struct ieee80211_sub_if_data *sdata;
4253         struct ieee80211_hdr *hdr;
4254         __le16 fc;
4255         struct ieee80211_rx_data rx;
4256         struct ieee80211_sub_if_data *prev;
4257         struct rhlist_head *tmp;
4258         int err = 0;
4259
4260         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4261         memset(&rx, 0, sizeof(rx));
4262         rx.skb = skb;
4263         rx.local = local;
4264         rx.napi = napi;
4265
4266         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4267                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4268
4269         if (ieee80211_is_mgmt(fc)) {
4270                 /* drop frame if too short for header */
4271                 if (skb->len < ieee80211_hdrlen(fc))
4272                         err = -ENOBUFS;
4273                 else
4274                         err = skb_linearize(skb);
4275         } else {
4276                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4277         }
4278
4279         if (err) {
4280                 dev_kfree_skb(skb);
4281                 return;
4282         }
4283
4284         hdr = (struct ieee80211_hdr *)skb->data;
4285         ieee80211_parse_qos(&rx);
4286         ieee80211_verify_alignment(&rx);
4287
4288         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4289                      ieee80211_is_beacon(hdr->frame_control)))
4290                 ieee80211_scan_rx(local, skb);
4291
4292         if (ieee80211_is_data(fc)) {
4293                 struct sta_info *sta, *prev_sta;
4294
4295                 if (pubsta) {
4296                         rx.sta = container_of(pubsta, struct sta_info, sta);
4297                         rx.sdata = rx.sta->sdata;
4298                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4299                                 return;
4300                         goto out;
4301                 }
4302
4303                 prev_sta = NULL;
4304
4305                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4306                         if (!prev_sta) {
4307                                 prev_sta = sta;
4308                                 continue;
4309                         }
4310
4311                         rx.sta = prev_sta;
4312                         rx.sdata = prev_sta->sdata;
4313                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4314
4315                         prev_sta = sta;
4316                 }
4317
4318                 if (prev_sta) {
4319                         rx.sta = prev_sta;
4320                         rx.sdata = prev_sta->sdata;
4321
4322                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4323                                 return;
4324                         goto out;
4325                 }
4326         }
4327
4328         prev = NULL;
4329
4330         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4331                 if (!ieee80211_sdata_running(sdata))
4332                         continue;
4333
4334                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4335                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4336                         continue;
4337
4338                 /*
4339                  * frame is destined for this interface, but if it's
4340                  * not also for the previous one we handle that after
4341                  * the loop to avoid copying the SKB once too much
4342                  */
4343
4344                 if (!prev) {
4345                         prev = sdata;
4346                         continue;
4347                 }
4348
4349                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4350                 rx.sdata = prev;
4351                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4352
4353                 prev = sdata;
4354         }
4355
4356         if (prev) {
4357                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4358                 rx.sdata = prev;
4359
4360                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4361                         return;
4362         }
4363
4364  out:
4365         dev_kfree_skb(skb);
4366 }
4367
4368 /*
4369  * This is the receive path handler. It is called by a low level driver when an
4370  * 802.11 MPDU is received from the hardware.
4371  */
4372 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4373                        struct sk_buff *skb, struct napi_struct *napi)
4374 {
4375         struct ieee80211_local *local = hw_to_local(hw);
4376         struct ieee80211_rate *rate = NULL;
4377         struct ieee80211_supported_band *sband;
4378         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4379
4380         WARN_ON_ONCE(softirq_count() == 0);
4381
4382         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4383                 goto drop;
4384
4385         sband = local->hw.wiphy->bands[status->band];
4386         if (WARN_ON(!sband))
4387                 goto drop;
4388
4389         /*
4390          * If we're suspending, it is possible although not too likely
4391          * that we'd be receiving frames after having already partially
4392          * quiesced the stack. We can't process such frames then since
4393          * that might, for example, cause stations to be added or other
4394          * driver callbacks be invoked.
4395          */
4396         if (unlikely(local->quiescing || local->suspended))
4397                 goto drop;
4398
4399         /* We might be during a HW reconfig, prevent Rx for the same reason */
4400         if (unlikely(local->in_reconfig))
4401                 goto drop;
4402
4403         /*
4404          * The same happens when we're not even started,
4405          * but that's worth a warning.
4406          */
4407         if (WARN_ON(!local->started))
4408                 goto drop;
4409
4410         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4411                 /*
4412                  * Validate the rate, unless a PLCP error means that
4413                  * we probably can't have a valid rate here anyway.
4414                  */
4415
4416                 switch (status->encoding) {
4417                 case RX_ENC_HT:
4418                         /*
4419                          * rate_idx is MCS index, which can be [0-76]
4420                          * as documented on:
4421                          *
4422                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4423                          *
4424                          * Anything else would be some sort of driver or
4425                          * hardware error. The driver should catch hardware
4426                          * errors.
4427                          */
4428                         if (WARN(status->rate_idx > 76,
4429                                  "Rate marked as an HT rate but passed "
4430                                  "status->rate_idx is not "
4431                                  "an MCS index [0-76]: %d (0x%02x)\n",
4432                                  status->rate_idx,
4433                                  status->rate_idx))
4434                                 goto drop;
4435                         break;
4436                 case RX_ENC_VHT:
4437                         if (WARN_ONCE(status->rate_idx > 11 ||
4438                                       !status->nss ||
4439                                       status->nss > 8,
4440                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4441                                       status->rate_idx, status->nss))
4442                                 goto drop;
4443                         break;
4444                 default:
4445                         WARN_ON_ONCE(1);
4446                         /* fall through */
4447                 case RX_ENC_LEGACY:
4448                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4449                                 goto drop;
4450                         rate = &sband->bitrates[status->rate_idx];
4451                 }
4452         }
4453
4454         status->rx_flags = 0;
4455
4456         /*
4457          * key references and virtual interfaces are protected using RCU
4458          * and this requires that we are in a read-side RCU section during
4459          * receive processing
4460          */
4461         rcu_read_lock();
4462
4463         /*
4464          * Frames with failed FCS/PLCP checksum are not returned,
4465          * all other frames are returned without radiotap header
4466          * if it was previously present.
4467          * Also, frames with less than 16 bytes are dropped.
4468          */
4469         skb = ieee80211_rx_monitor(local, skb, rate);
4470         if (!skb) {
4471                 rcu_read_unlock();
4472                 return;
4473         }
4474
4475         ieee80211_tpt_led_trig_rx(local,
4476                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4477                         skb->len);
4478
4479         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4480
4481         rcu_read_unlock();
4482
4483         return;
4484  drop:
4485         kfree_skb(skb);
4486 }
4487 EXPORT_SYMBOL(ieee80211_rx_napi);
4488
4489 /* This is a version of the rx handler that can be called from hard irq
4490  * context. Post the skb on the queue and schedule the tasklet */
4491 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4492 {
4493         struct ieee80211_local *local = hw_to_local(hw);
4494
4495         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4496
4497         skb->pkt_type = IEEE80211_RX_MSG;
4498         skb_queue_tail(&local->skb_queue, skb);
4499         tasklet_schedule(&local->tasklet);
4500 }
4501 EXPORT_SYMBOL(ieee80211_rx_irqsafe);