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 <[email protected]>
   5  * Copyright 2007-2010  Johannes Berg <[email protected]>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/jiffies.h>
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/export.h>
  22 #include <linux/bitops.h>
  23 #include <net/mac80211.h>
  24 #include <net/ieee80211_radiotap.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "led.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wpa.h"
  33 #include "tkip.h"
  34 #include "wme.h"
  35 #include "rate.h"
  36
  37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  38 {
  39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  40
  41         u64_stats_update_begin(&tstats->syncp);
  42         tstats->rx_packets++;
  43         tstats->rx_bytes += len;
  44         u64_stats_update_end(&tstats->syncp);
  45 }
  46
  47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  48                                enum nl80211_iftype type)
  49 {
  50         __le16 fc = hdr->frame_control;
  51
  52         if (ieee80211_is_data(fc)) {
  53                 if (len < 24) /* drop incorrect hdr len (data) */
  54                         return NULL;
  55
  56                 if (ieee80211_has_a4(fc))
  57                         return NULL;
  58                 if (ieee80211_has_tods(fc))
  59                         return hdr->addr1;
  60                 if (ieee80211_has_fromds(fc))
  61                         return hdr->addr2;
  62
  63                 return hdr->addr3;
  64         }
  65
  66         if (ieee80211_is_mgmt(fc)) {
  67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  68                         return NULL;
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_ctl(fc)) {
  73                 if (ieee80211_is_pspoll(fc))
  74                         return hdr->addr1;
  75
  76                 if (ieee80211_is_back_req(fc)) {
  77                         switch (type) {
  78                         case NL80211_IFTYPE_STATION:
  79                                 return hdr->addr2;
  80                         case NL80211_IFTYPE_AP:
  81                         case NL80211_IFTYPE_AP_VLAN:
  82                                 return hdr->addr1;
  83                         default:
  84                                 break; /* fall through to the return */
  85                         }
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 /*
  93  * monitor mode reception
  94  *
  95  * This function cleans up the SKB, i.e. it removes all the stuff
  96  * only useful for monitoring.
  97  */
  98 static void remove_monitor_info(struct sk_buff *skb,
  99                                 unsigned int present_fcs_len,
 100                                 unsigned int rtap_vendor_space)
 101 {
 102         if (present_fcs_len)
 103                 __pskb_trim(skb, skb->len - present_fcs_len);
 104         __pskb_pull(skb, rtap_vendor_space);
 105 }
 106
 107 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 108                                      unsigned int rtap_vendor_space)
 109 {
 110         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 111         struct ieee80211_hdr *hdr;
 112
 113         hdr = (void *)(skb->data + rtap_vendor_space);
 114
 115         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 116                             RX_FLAG_FAILED_PLCP_CRC |
 117                             RX_FLAG_ONLY_MONITOR))
 118                 return true;
 119
 120         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
 121                 return true;
 122
 123         if (ieee80211_is_ctl(hdr->frame_control) &&
 124             !ieee80211_is_pspoll(hdr->frame_control) &&
 125             !ieee80211_is_back_req(hdr->frame_control))
 126                 return true;
 127
 128         return false;
 129 }
 130
 131 static int
 132 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 133                              struct ieee80211_rx_status *status,
 134                              struct sk_buff *skb)
 135 {
 136         int len;
 137
 138         /* always present fields */
 139         len = sizeof(struct ieee80211_radiotap_header) + 8;
 140
 141         /* allocate extra bitmaps */
 142         if (status->chains)
 143                 len += 4 * hweight8(status->chains);
 144
 145         if (ieee80211_have_rx_timestamp(status)) {
 146                 len = ALIGN(len, 8);
 147                 len += 8;
 148         }
 149         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 150                 len += 1;
 151
 152         /* antenna field, if we don't have per-chain info */
 153         if (!status->chains)
 154                 len += 1;
 155
 156         /* padding for RX_FLAGS if necessary */
 157         len = ALIGN(len, 2);
 158
 159         if (status->encoding == RX_ENC_HT) /* HT info */
 160                 len += 3;
 161
 162         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 163                 len = ALIGN(len, 4);
 164                 len += 8;
 165         }
 166
 167         if (status->encoding == RX_ENC_VHT) {
 168                 len = ALIGN(len, 2);
 169                 len += 12;
 170         }
 171
 172         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 173                 len = ALIGN(len, 8);
 174                 len += 12;
 175         }
 176
 177         if (status->chains) {
 178                 /* antenna and antenna signal fields */
 179                 len += 2 * hweight8(status->chains);
 180         }
 181
 182         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 183                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 184
 185                 /* vendor presence bitmap */
 186                 len += 4;
 187                 /* alignment for fixed 6-byte vendor data header */
 188                 len = ALIGN(len, 2);
 189                 /* vendor data header */
 190                 len += 6;
 191                 if (WARN_ON(rtap->align == 0))
 192                         rtap->align = 1;
 193                 len = ALIGN(len, rtap->align);
 194                 len += rtap->len + rtap->pad;
 195         }
 196
 197         return len;
 198 }
 199
 200 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 201                                          struct sk_buff *skb,
 202                                          int rtap_vendor_space)
 203 {
 204         struct {
 205                 struct ieee80211_hdr_3addr hdr;
 206                 u8 category;
 207                 u8 action_code;
 208         } __packed action;
 209
 210         if (!sdata)
 211                 return;
 212
 213         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 214
 215         if (skb->len < rtap_vendor_space + sizeof(action) +
 216                        VHT_MUMIMO_GROUPS_DATA_LEN)
 217                 return;
 218
 219         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 220                 return;
 221
 222         skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
 223
 224         if (!ieee80211_is_action(action.hdr.frame_control))
 225                 return;
 226
 227         if (action.category != WLAN_CATEGORY_VHT)
 228                 return;
 229
 230         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 231                 return;
 232
 233         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 234                 return;
 235
 236         skb = skb_copy(skb, GFP_ATOMIC);
 237         if (!skb)
 238                 return;
 239
 240         skb_queue_tail(&sdata->skb_queue, skb);
 241         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 242 }
 243
 244 /*
 245  * ieee80211_add_rx_radiotap_header - add radiotap header
 246  *
 247  * add a radiotap header containing all the fields which the hardware provided.
 248  */
 249 static void
 250 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 251                                  struct sk_buff *skb,
 252                                  struct ieee80211_rate *rate,
 253                                  int rtap_len, bool has_fcs)
 254 {
 255         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 256         struct ieee80211_radiotap_header *rthdr;
 257         unsigned char *pos;
 258         __le32 *it_present;
 259         u32 it_present_val;
 260         u16 rx_flags = 0;
 261         u16 channel_flags = 0;
 262         int mpdulen, chain;
 263         unsigned long chains = status->chains;
 264         struct ieee80211_vendor_radiotap rtap = {};
 265
 266         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 267                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 268                 /* rtap.len and rtap.pad are undone immediately */
 269                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 270         }
 271
 272         mpdulen = skb->len;
 273         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 274                 mpdulen += FCS_LEN;
 275
 276         rthdr = skb_push(skb, rtap_len);
 277         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 278         it_present = &rthdr->it_present;
 279
 280         /* radiotap header, set always present flags */
 281         rthdr->it_len = cpu_to_le16(rtap_len);
 282         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 283                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 284                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 285
 286         if (!status->chains)
 287                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 288
 289         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 290                 it_present_val |=
 291                         BIT(IEEE80211_RADIOTAP_EXT) |
 292                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 293                 put_unaligned_le32(it_present_val, it_present);
 294                 it_present++;
 295                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 296                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 297         }
 298
 299         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 300                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 301                                   BIT(IEEE80211_RADIOTAP_EXT);
 302                 put_unaligned_le32(it_present_val, it_present);
 303                 it_present++;
 304                 it_present_val = rtap.present;
 305         }
 306
 307         put_unaligned_le32(it_present_val, it_present);
 308
 309         pos = (void *)(it_present + 1);
 310
 311         /* the order of the following fields is important */
 312
 313         /* IEEE80211_RADIOTAP_TSFT */
 314         if (ieee80211_have_rx_timestamp(status)) {
 315                 /* padding */
 316                 while ((pos - (u8 *)rthdr) & 7)
 317                         *pos++ = 0;
 318                 put_unaligned_le64(
 319                         ieee80211_calculate_rx_timestamp(local, status,
 320                                                          mpdulen, 0),
 321                         pos);
 322                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 323                 pos += 8;
 324         }
 325
 326         /* IEEE80211_RADIOTAP_FLAGS */
 327         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 328                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 329         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 330                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 331         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 332                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 333         pos++;
 334
 335         /* IEEE80211_RADIOTAP_RATE */
 336         if (!rate || status->encoding != RX_ENC_LEGACY) {
 337                 /*
 338                  * Without rate information don't add it. If we have,
 339                  * MCS information is a separate field in radiotap,
 340                  * added below. The byte here is needed as padding
 341                  * for the channel though, so initialise it to 0.
 342                  */
 343                 *pos = 0;
 344         } else {
 345                 int shift = 0;
 346                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 347                 if (status->bw == RATE_INFO_BW_10)
 348                         shift = 1;
 349                 else if (status->bw == RATE_INFO_BW_5)
 350                         shift = 2;
 351                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 352         }
 353         pos++;
 354
 355         /* IEEE80211_RADIOTAP_CHANNEL */
 356         put_unaligned_le16(status->freq, pos);
 357         pos += 2;
 358         if (status->bw == RATE_INFO_BW_10)
 359                 channel_flags |= IEEE80211_CHAN_HALF;
 360         else if (status->bw == RATE_INFO_BW_5)
 361                 channel_flags |= IEEE80211_CHAN_QUARTER;
 362
 363         if (status->band == NL80211_BAND_5GHZ)
 364                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 365         else if (status->encoding != RX_ENC_LEGACY)
 366                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 367         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 368                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 369         else if (rate)
 370                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 371         else
 372                 channel_flags |= IEEE80211_CHAN_2GHZ;
 373         put_unaligned_le16(channel_flags, pos);
 374         pos += 2;
 375
 376         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 377         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 378             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 379                 *pos = status->signal;
 380                 rthdr->it_present |=
 381                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 382                 pos++;
 383         }
 384
 385         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 386
 387         if (!status->chains) {
 388                 /* IEEE80211_RADIOTAP_ANTENNA */
 389                 *pos = status->antenna;
 390                 pos++;
 391         }
 392
 393         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 394
 395         /* IEEE80211_RADIOTAP_RX_FLAGS */
 396         /* ensure 2 byte alignment for the 2 byte field as required */
 397         if ((pos - (u8 *)rthdr) & 1)
 398                 *pos++ = 0;
 399         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 400                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 401         put_unaligned_le16(rx_flags, pos);
 402         pos += 2;
 403
 404         if (status->encoding == RX_ENC_HT) {
 405                 unsigned int stbc;
 406
 407                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 408                 *pos++ = local->hw.radiotap_mcs_details;
 409                 *pos = 0;
 410                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 411                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 412                 if (status->bw == RATE_INFO_BW_40)
 413                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 414                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 415                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 416                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 417                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 418                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 419                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 420                 pos++;
 421                 *pos++ = status->rate_idx;
 422         }
 423
 424         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 425                 u16 flags = 0;
 426
 427                 /* ensure 4 byte alignment */
 428                 while ((pos - (u8 *)rthdr) & 3)
 429                         pos++;
 430                 rthdr->it_present |=
 431                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 432                 put_unaligned_le32(status->ampdu_reference, pos);
 433                 pos += 4;
 434                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 435                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 436                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 437                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 438                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 439                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 440                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 441                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 442                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 443                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 444                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 445                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 446                 put_unaligned_le16(flags, pos);
 447                 pos += 2;
 448                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 449                         *pos++ = status->ampdu_delimiter_crc;
 450                 else
 451                         *pos++ = 0;
 452                 *pos++ = 0;
 453         }
 454
 455         if (status->encoding == RX_ENC_VHT) {
 456                 u16 known = local->hw.radiotap_vht_details;
 457
 458                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 459                 put_unaligned_le16(known, pos);
 460                 pos += 2;
 461                 /* flags */
 462                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 463                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 464                 /* in VHT, STBC is binary */
 465                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 466                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 467                 if (status->enc_flags & RX_ENC_FLAG_BF)
 468                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 469                 pos++;
 470                 /* bandwidth */
 471                 switch (status->bw) {
 472                 case RATE_INFO_BW_80:
 473                         *pos++ = 4;
 474                         break;
 475                 case RATE_INFO_BW_160:
 476                         *pos++ = 11;
 477                         break;
 478                 case RATE_INFO_BW_40:
 479                         *pos++ = 1;
 480                         break;
 481                 default:
 482                         *pos++ = 0;
 483                 }
 484                 /* MCS/NSS */
 485                 *pos = (status->rate_idx << 4) | status->nss;
 486                 pos += 4;
 487                 /* coding field */
 488                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 489                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 490                 pos++;
 491                 /* group ID */
 492                 pos++;
 493                 /* partial_aid */
 494                 pos += 2;
 495         }
 496
 497         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 498                 u16 accuracy = 0;
 499                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 500
 501                 rthdr->it_present |=
 502                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 503
 504                 /* ensure 8 byte alignment */
 505                 while ((pos - (u8 *)rthdr) & 7)
 506                         pos++;
 507
 508                 put_unaligned_le64(status->device_timestamp, pos);
 509                 pos += sizeof(u64);
 510
 511                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 512                         accuracy = local->hw.radiotap_timestamp.accuracy;
 513                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 514                 }
 515                 put_unaligned_le16(accuracy, pos);
 516                 pos += sizeof(u16);
 517
 518                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 519                 *pos++ = flags;
 520         }
 521
 522         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 523                 *pos++ = status->chain_signal[chain];
 524                 *pos++ = chain;
 525         }
 526
 527         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 528                 /* ensure 2 byte alignment for the vendor field as required */
 529                 if ((pos - (u8 *)rthdr) & 1)
 530                         *pos++ = 0;
 531                 *pos++ = rtap.oui[0];
 532                 *pos++ = rtap.oui[1];
 533                 *pos++ = rtap.oui[2];
 534                 *pos++ = rtap.subns;
 535                 put_unaligned_le16(rtap.len, pos);
 536                 pos += 2;
 537                 /* align the actual payload as requested */
 538                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 539                         *pos++ = 0;
 540                 /* data (and possible padding) already follows */
 541         }
 542 }
 543
 544 static struct sk_buff *
 545 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 546                            struct sk_buff **origskb,
 547                            struct ieee80211_rate *rate,
 548                            int rtap_vendor_space, bool use_origskb)
 549 {
 550         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 551         int rt_hdrlen, needed_headroom;
 552         struct sk_buff *skb;
 553
 554         /* room for the radiotap header based on driver features */
 555         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 556         needed_headroom = rt_hdrlen - rtap_vendor_space;
 557
 558         if (use_origskb) {
 559                 /* only need to expand headroom if necessary */
 560                 skb = *origskb;
 561                 *origskb = NULL;
 562
 563                 /*
 564                  * This shouldn't trigger often because most devices have an
 565                  * RX header they pull before we get here, and that should
 566                  * be big enough for our radiotap information. We should
 567                  * probably export the length to drivers so that we can have
 568                  * them allocate enough headroom to start with.
 569                  */
 570                 if (skb_headroom(skb) < needed_headroom &&
 571                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 572                         dev_kfree_skb(skb);
 573                         return NULL;
 574                 }
 575         } else {
 576                 /*
 577                  * Need to make a copy and possibly remove radiotap header
 578                  * and FCS from the original.
 579                  */
 580                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 581
 582                 if (!skb)
 583                         return NULL;
 584         }
 585
 586         /* prepend radiotap information */
 587         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 588
 589         skb_reset_mac_header(skb);
 590         skb->ip_summed = CHECKSUM_UNNECESSARY;
 591         skb->pkt_type = PACKET_OTHERHOST;
 592         skb->protocol = htons(ETH_P_802_2);
 593
 594         return skb;
 595 }
 596
 597 /*
 598  * This function copies a received frame to all monitor interfaces and
 599  * returns a cleaned-up SKB that no longer includes the FCS nor the
 600  * radiotap header the driver might have added.
 601  */
 602 static struct sk_buff *
 603 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 604                      struct ieee80211_rate *rate)
 605 {
 606         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 607         struct ieee80211_sub_if_data *sdata;
 608         struct sk_buff *monskb = NULL;
 609         int present_fcs_len = 0;
 610         unsigned int rtap_vendor_space = 0;
 611         struct ieee80211_sub_if_data *monitor_sdata =
 612                 rcu_dereference(local->monitor_sdata);
 613         bool only_monitor = false;
 614
 615         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 616                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 617
 618                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
 619         }
 620
 621         /*
 622          * First, we may need to make a copy of the skb because
 623          *  (1) we need to modify it for radiotap (if not present), and
 624          *  (2) the other RX handlers will modify the skb we got.
 625          *
 626          * We don't need to, of course, if we aren't going to return
 627          * the SKB because it has a bad FCS/PLCP checksum.
 628          */
 629
 630         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 631                 if (unlikely(origskb->len <= FCS_LEN)) {
 632                         /* driver bug */
 633                         WARN_ON(1);
 634                         dev_kfree_skb(origskb);
 635                         return NULL;
 636                 }
 637                 present_fcs_len = FCS_LEN;
 638         }
 639
 640         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 641         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
 642                 dev_kfree_skb(origskb);
 643                 return NULL;
 644         }
 645
 646         only_monitor = should_drop_frame(origskb, present_fcs_len,
 647                                          rtap_vendor_space);
 648
 649         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 650                 if (only_monitor) {
 651                         dev_kfree_skb(origskb);
 652                         return NULL;
 653                 }
 654
 655                 remove_monitor_info(origskb, present_fcs_len,
 656                                     rtap_vendor_space);
 657                 return origskb;
 658         }
 659
 660         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
 661
 662         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 663                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 664                                                  &local->mon_list);
 665
 666                 if (!monskb)
 667                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 668                                                             rate,
 669                                                             rtap_vendor_space,
 670                                                             only_monitor &&
 671                                                             last_monitor);
 672
 673                 if (monskb) {
 674                         struct sk_buff *skb;
 675
 676                         if (last_monitor) {
 677                                 skb = monskb;
 678                                 monskb = NULL;
 679                         } else {
 680                                 skb = skb_clone(monskb, GFP_ATOMIC);
 681                         }
 682
 683                         if (skb) {
 684                                 skb->dev = sdata->dev;
 685                                 ieee80211_rx_stats(skb->dev, skb->len);
 686                                 netif_receive_skb(skb);
 687                         }
 688                 }
 689
 690                 if (last_monitor)
 691                         break;
 692         }
 693
 694         /* this happens if last_monitor was erroneously false */
 695         dev_kfree_skb(monskb);
 696
 697         /* ditto */
 698         if (!origskb)
 699                 return NULL;
 700
 701         remove_monitor_info(origskb, present_fcs_len, rtap_vendor_space);
 702         return origskb;
 703 }
 704
 705 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 706 {
 707         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 708         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 709         int tid, seqno_idx, security_idx;
 710
 711         /* does the frame have a qos control field? */
 712         if (ieee80211_is_data_qos(hdr->frame_control)) {
 713                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 714                 /* frame has qos control */
 715                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 716                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 717                         status->rx_flags |= IEEE80211_RX_AMSDU;
 718
 719                 seqno_idx = tid;
 720                 security_idx = tid;
 721         } else {
 722                 /*
 723                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 724                  *
 725                  *      Sequence numbers for management frames, QoS data
 726                  *      frames with a broadcast/multicast address in the
 727                  *      Address 1 field, and all non-QoS data frames sent
 728                  *      by QoS STAs are assigned using an additional single
 729                  *      modulo-4096 counter, [...]
 730                  *
 731                  * We also use that counter for non-QoS STAs.
 732                  */
 733                 seqno_idx = IEEE80211_NUM_TIDS;
 734                 security_idx = 0;
 735                 if (ieee80211_is_mgmt(hdr->frame_control))
 736                         security_idx = IEEE80211_NUM_TIDS;
 737                 tid = 0;
 738         }
 739
 740         rx->seqno_idx = seqno_idx;
 741         rx->security_idx = security_idx;
 742         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 743          * For now, set skb->priority to 0 for other cases. */
 744         rx->skb->priority = (tid > 7) ? 0 : tid;
 745 }
 746
 747 /**
 748  * DOC: Packet alignment
 749  *
 750  * Drivers always need to pass packets that are aligned to two-byte boundaries
 751  * to the stack.
 752  *
 753  * Additionally, should, if possible, align the payload data in a way that
 754  * guarantees that the contained IP header is aligned to a four-byte
 755  * boundary. In the case of regular frames, this simply means aligning the
 756  * payload to a four-byte boundary (because either the IP header is directly
 757  * contained, or IV/RFC1042 headers that have a length divisible by four are
 758  * in front of it).  If the payload data is not properly aligned and the
 759  * architecture doesn't support efficient unaligned operations, mac80211
 760  * will align the data.
 761  *
 762  * With A-MSDU frames, however, the payload data address must yield two modulo
 763  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 764  * push the IP header further back to a multiple of four again. Thankfully, the
 765  * specs were sane enough this time around to require padding each A-MSDU
 766  * subframe to a length that is a multiple of four.
 767  *
 768  * Padding like Atheros hardware adds which is between the 802.11 header and
 769  * the payload is not supported, the driver is required to move the 802.11
 770  * header to be directly in front of the payload in that case.
 771  */
 772 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 773 {
 774 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 775         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 776 #endif
 777 }
 778
 779
 780 /* rx handlers */
 781
 782 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 783 {
 784         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 785
 786         if (is_multicast_ether_addr(hdr->addr1))
 787                 return 0;
 788
 789         return ieee80211_is_robust_mgmt_frame(skb);
 790 }
 791
 792
 793 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 794 {
 795         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 796
 797         if (!is_multicast_ether_addr(hdr->addr1))
 798                 return 0;
 799
 800         return ieee80211_is_robust_mgmt_frame(skb);
 801 }
 802
 803
 804 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 805 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 806 {
 807         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 808         struct ieee80211_mmie *mmie;
 809         struct ieee80211_mmie_16 *mmie16;
 810
 811         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 812                 return -1;
 813
 814         if (!ieee80211_is_robust_mgmt_frame(skb))
 815                 return -1; /* not a robust management frame */
 816
 817         mmie = (struct ieee80211_mmie *)
 818                 (skb->data + skb->len - sizeof(*mmie));
 819         if (mmie->element_id == WLAN_EID_MMIE &&
 820             mmie->length == sizeof(*mmie) - 2)
 821                 return le16_to_cpu(mmie->key_id);
 822
 823         mmie16 = (struct ieee80211_mmie_16 *)
 824                 (skb->data + skb->len - sizeof(*mmie16));
 825         if (skb->len >= 24 + sizeof(*mmie16) &&
 826             mmie16->element_id == WLAN_EID_MMIE &&
 827             mmie16->length == sizeof(*mmie16) - 2)
 828                 return le16_to_cpu(mmie16->key_id);
 829
 830         return -1;
 831 }
 832
 833 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 834                                   struct sk_buff *skb)
 835 {
 836         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 837         __le16 fc;
 838         int hdrlen;
 839         u8 keyid;
 840
 841         fc = hdr->frame_control;
 842         hdrlen = ieee80211_hdrlen(fc);
 843
 844         if (skb->len < hdrlen + cs->hdr_len)
 845                 return -EINVAL;
 846
 847         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 848         keyid &= cs->key_idx_mask;
 849         keyid >>= cs->key_idx_shift;
 850
 851         return keyid;
 852 }
 853
 854 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 855 {
 856         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 857         char *dev_addr = rx->sdata->vif.addr;
 858
 859         if (ieee80211_is_data(hdr->frame_control)) {
 860                 if (is_multicast_ether_addr(hdr->addr1)) {
 861                         if (ieee80211_has_tods(hdr->frame_control) ||
 862                             !ieee80211_has_fromds(hdr->frame_control))
 863                                 return RX_DROP_MONITOR;
 864                         if (ether_addr_equal(hdr->addr3, dev_addr))
 865                                 return RX_DROP_MONITOR;
 866                 } else {
 867                         if (!ieee80211_has_a4(hdr->frame_control))
 868                                 return RX_DROP_MONITOR;
 869                         if (ether_addr_equal(hdr->addr4, dev_addr))
 870                                 return RX_DROP_MONITOR;
 871                 }
 872         }
 873
 874         /* If there is not an established peer link and this is not a peer link
 875          * establisment frame, beacon or probe, drop the frame.
 876          */
 877
 878         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 879                 struct ieee80211_mgmt *mgmt;
 880
 881                 if (!ieee80211_is_mgmt(hdr->frame_control))
 882                         return RX_DROP_MONITOR;
 883
 884                 if (ieee80211_is_action(hdr->frame_control)) {
 885                         u8 category;
 886
 887                         /* make sure category field is present */
 888                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 889                                 return RX_DROP_MONITOR;
 890
 891                         mgmt = (struct ieee80211_mgmt *)hdr;
 892                         category = mgmt->u.action.category;
 893                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 894                             category != WLAN_CATEGORY_SELF_PROTECTED)
 895                                 return RX_DROP_MONITOR;
 896                         return RX_CONTINUE;
 897                 }
 898
 899                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 900                     ieee80211_is_probe_resp(hdr->frame_control) ||
 901                     ieee80211_is_beacon(hdr->frame_control) ||
 902                     ieee80211_is_auth(hdr->frame_control))
 903                         return RX_CONTINUE;
 904
 905                 return RX_DROP_MONITOR;
 906         }
 907
 908         return RX_CONTINUE;
 909 }
 910
 911 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 912                                               int index)
 913 {
 914         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 915         struct sk_buff *tail = skb_peek_tail(frames);
 916         struct ieee80211_rx_status *status;
 917
 918         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 919                 return true;
 920
 921         if (!tail)
 922                 return false;
 923
 924         status = IEEE80211_SKB_RXCB(tail);
 925         if (status->flag & RX_FLAG_AMSDU_MORE)
 926                 return false;
 927
 928         return true;
 929 }
 930
 931 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 932                                             struct tid_ampdu_rx *tid_agg_rx,
 933                                             int index,
 934                                             struct sk_buff_head *frames)
 935 {
 936         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 937         struct sk_buff *skb;
 938         struct ieee80211_rx_status *status;
 939
 940         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 941
 942         if (skb_queue_empty(skb_list))
 943                 goto no_frame;
 944
 945         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 946                 __skb_queue_purge(skb_list);
 947                 goto no_frame;
 948         }
 949
 950         /* release frames from the reorder ring buffer */
 951         tid_agg_rx->stored_mpdu_num--;
 952         while ((skb = __skb_dequeue(skb_list))) {
 953                 status = IEEE80211_SKB_RXCB(skb);
 954                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 955                 __skb_queue_tail(frames, skb);
 956         }
 957
 958 no_frame:
 959         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 960         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 961 }
 962
 963 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 964                                              struct tid_ampdu_rx *tid_agg_rx,
 965                                              u16 head_seq_num,
 966                                              struct sk_buff_head *frames)
 967 {
 968         int index;
 969
 970         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 971
 972         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 973                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 974                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 975                                                 frames);
 976         }
 977 }
 978
 979 /*
 980  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 981  * the skb was added to the buffer longer than this time ago, the earlier
 982  * frames that have not yet been received are assumed to be lost and the skb
 983  * can be released for processing. This may also release other skb's from the
 984  * reorder buffer if there are no additional gaps between the frames.
 985  *
 986  * Callers must hold tid_agg_rx->reorder_lock.
 987  */
 988 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 989
 990 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 991                                           struct tid_ampdu_rx *tid_agg_rx,
 992                                           struct sk_buff_head *frames)
 993 {
 994         int index, i, j;
 995
 996         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 997
 998         /* release the buffer until next missing frame */
 999         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1000         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1001             tid_agg_rx->stored_mpdu_num) {
1002                 /*
1003                  * No buffers ready to be released, but check whether any
1004                  * frames in the reorder buffer have timed out.
1005                  */
1006                 int skipped = 1;
1007                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1008                      j = (j + 1) % tid_agg_rx->buf_size) {
1009                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1010                                 skipped++;
1011                                 continue;
1012                         }
1013                         if (skipped &&
1014                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1015                                         HT_RX_REORDER_BUF_TIMEOUT))
1016                                 goto set_release_timer;
1017
1018                         /* don't leave incomplete A-MSDUs around */
1019                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1020                              i = (i + 1) % tid_agg_rx->buf_size)
1021                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1022
1023                         ht_dbg_ratelimited(sdata,
1024                                            "release an RX reorder frame due to timeout on earlier frames\n");
1025                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1026                                                         frames);
1027
1028                         /*
1029                          * Increment the head seq# also for the skipped slots.
1030                          */
1031                         tid_agg_rx->head_seq_num =
1032                                 (tid_agg_rx->head_seq_num +
1033                                  skipped) & IEEE80211_SN_MASK;
1034                         skipped = 0;
1035                 }
1036         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1037                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1038                                                 frames);
1039                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1040         }
1041
1042         if (tid_agg_rx->stored_mpdu_num) {
1043                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1044
1045                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1046                      j = (j + 1) % tid_agg_rx->buf_size) {
1047                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1048                                 break;
1049                 }
1050
1051  set_release_timer:
1052
1053                 if (!tid_agg_rx->removed)
1054                         mod_timer(&tid_agg_rx->reorder_timer,
1055                                   tid_agg_rx->reorder_time[j] + 1 +
1056                                   HT_RX_REORDER_BUF_TIMEOUT);
1057         } else {
1058                 del_timer(&tid_agg_rx->reorder_timer);
1059         }
1060 }
1061
1062 /*
1063  * As this function belongs to the RX path it must be under
1064  * rcu_read_lock protection. It returns false if the frame
1065  * can be processed immediately, true if it was consumed.
1066  */
1067 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1068                                              struct tid_ampdu_rx *tid_agg_rx,
1069                                              struct sk_buff *skb,
1070                                              struct sk_buff_head *frames)
1071 {
1072         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1073         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1074         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1075         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1076         u16 head_seq_num, buf_size;
1077         int index;
1078         bool ret = true;
1079
1080         spin_lock(&tid_agg_rx->reorder_lock);
1081
1082         /*
1083          * Offloaded BA sessions have no known starting sequence number so pick
1084          * one from first Rxed frame for this tid after BA was started.
1085          */
1086         if (unlikely(tid_agg_rx->auto_seq)) {
1087                 tid_agg_rx->auto_seq = false;
1088                 tid_agg_rx->ssn = mpdu_seq_num;
1089                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1090         }
1091
1092         buf_size = tid_agg_rx->buf_size;
1093         head_seq_num = tid_agg_rx->head_seq_num;
1094
1095         /*
1096          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1097          * be reordered.
1098          */
1099         if (unlikely(!tid_agg_rx->started)) {
1100                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1101                         ret = false;
1102                         goto out;
1103                 }
1104                 tid_agg_rx->started = true;
1105         }
1106
1107         /* frame with out of date sequence number */
1108         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1109                 dev_kfree_skb(skb);
1110                 goto out;
1111         }
1112
1113         /*
1114          * If frame the sequence number exceeds our buffering window
1115          * size release some previous frames to make room for this one.
1116          */
1117         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1118                 head_seq_num = ieee80211_sn_inc(
1119                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1120                 /* release stored frames up to new head to stack */
1121                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1122                                                  head_seq_num, frames);
1123         }
1124
1125         /* Now the new frame is always in the range of the reordering buffer */
1126
1127         index = mpdu_seq_num % tid_agg_rx->buf_size;
1128
1129         /* check if we already stored this frame */
1130         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1131                 dev_kfree_skb(skb);
1132                 goto out;
1133         }
1134
1135         /*
1136          * If the current MPDU is in the right order and nothing else
1137          * is stored we can process it directly, no need to buffer it.
1138          * If it is first but there's something stored, we may be able
1139          * to release frames after this one.
1140          */
1141         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1142             tid_agg_rx->stored_mpdu_num == 0) {
1143                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1144                         tid_agg_rx->head_seq_num =
1145                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1146                 ret = false;
1147                 goto out;
1148         }
1149
1150         /* put the frame in the reordering buffer */
1151         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1152         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1153                 tid_agg_rx->reorder_time[index] = jiffies;
1154                 tid_agg_rx->stored_mpdu_num++;
1155                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1156         }
1157
1158  out:
1159         spin_unlock(&tid_agg_rx->reorder_lock);
1160         return ret;
1161 }
1162
1163 /*
1164  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1165  * true if the MPDU was buffered, false if it should be processed.
1166  */
1167 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1168                                        struct sk_buff_head *frames)
1169 {
1170         struct sk_buff *skb = rx->skb;
1171         struct ieee80211_local *local = rx->local;
1172         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1173         struct sta_info *sta = rx->sta;
1174         struct tid_ampdu_rx *tid_agg_rx;
1175         u16 sc;
1176         u8 tid, ack_policy;
1177
1178         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1179             is_multicast_ether_addr(hdr->addr1))
1180                 goto dont_reorder;
1181
1182         /*
1183          * filter the QoS data rx stream according to
1184          * STA/TID and check if this STA/TID is on aggregation
1185          */
1186
1187         if (!sta)
1188                 goto dont_reorder;
1189
1190         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1191                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1192         tid = ieee80211_get_tid(hdr);
1193
1194         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1195         if (!tid_agg_rx) {
1196                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1197                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1198                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1199                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1200                                              WLAN_BACK_RECIPIENT,
1201                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1202                 goto dont_reorder;
1203         }
1204
1205         /* qos null data frames are excluded */
1206         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1207                 goto dont_reorder;
1208
1209         /* not part of a BA session */
1210         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1211             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1212                 goto dont_reorder;
1213
1214         /* new, potentially un-ordered, ampdu frame - process it */
1215
1216         /* reset session timer */
1217         if (tid_agg_rx->timeout)
1218                 tid_agg_rx->last_rx = jiffies;
1219
1220         /* if this mpdu is fragmented - terminate rx aggregation session */
1221         sc = le16_to_cpu(hdr->seq_ctrl);
1222         if (sc & IEEE80211_SCTL_FRAG) {
1223                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1224                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1225                 return;
1226         }
1227
1228         /*
1229          * No locking needed -- we will only ever process one
1230          * RX packet at a time, and thus own tid_agg_rx. All
1231          * other code manipulating it needs to (and does) make
1232          * sure that we cannot get to it any more before doing
1233          * anything with it.
1234          */
1235         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1236                                              frames))
1237                 return;
1238
1239  dont_reorder:
1240         __skb_queue_tail(frames, skb);
1241 }
1242
1243 static ieee80211_rx_result debug_noinline
1244 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1245 {
1246         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1247         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1248
1249         if (status->flag & RX_FLAG_DUP_VALIDATED)
1250                 return RX_CONTINUE;
1251
1252         /*
1253          * Drop duplicate 802.11 retransmissions
1254          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1255          */
1256
1257         if (rx->skb->len < 24)
1258                 return RX_CONTINUE;
1259
1260         if (ieee80211_is_ctl(hdr->frame_control) ||
1261             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1262             is_multicast_ether_addr(hdr->addr1))
1263                 return RX_CONTINUE;
1264
1265         if (!rx->sta)
1266                 return RX_CONTINUE;
1267
1268         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1269                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1270                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1271                 rx->sta->rx_stats.num_duplicates++;
1272                 return RX_DROP_UNUSABLE;
1273         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1274                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1275         }
1276
1277         return RX_CONTINUE;
1278 }
1279
1280 static ieee80211_rx_result debug_noinline
1281 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1282 {
1283         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1284
1285         /* Drop disallowed frame classes based on STA auth/assoc state;
1286          * IEEE 802.11, Chap 5.5.
1287          *
1288          * mac80211 filters only based on association state, i.e. it drops
1289          * Class 3 frames from not associated stations. hostapd sends
1290          * deauth/disassoc frames when needed. In addition, hostapd is
1291          * responsible for filtering on both auth and assoc states.
1292          */
1293
1294         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1295                 return ieee80211_rx_mesh_check(rx);
1296
1297         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1298                       ieee80211_is_pspoll(hdr->frame_control)) &&
1299                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1300                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1301                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1302                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1303                 /*
1304                  * accept port control frames from the AP even when it's not
1305                  * yet marked ASSOC to prevent a race where we don't set the
1306                  * assoc bit quickly enough before it sends the first frame
1307                  */
1308                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1309                     ieee80211_is_data_present(hdr->frame_control)) {
1310                         unsigned int hdrlen;
1311                         __be16 ethertype;
1312
1313                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1314
1315                         if (rx->skb->len < hdrlen + 8)
1316                                 return RX_DROP_MONITOR;
1317
1318                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1319                         if (ethertype == rx->sdata->control_port_protocol)
1320                                 return RX_CONTINUE;
1321                 }
1322
1323                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1324                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1325                                                hdr->addr2,
1326                                                GFP_ATOMIC))
1327                         return RX_DROP_UNUSABLE;
1328
1329                 return RX_DROP_MONITOR;
1330         }
1331
1332         return RX_CONTINUE;
1333 }
1334
1335
1336 static ieee80211_rx_result debug_noinline
1337 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1338 {
1339         struct ieee80211_local *local;
1340         struct ieee80211_hdr *hdr;
1341         struct sk_buff *skb;
1342
1343         local = rx->local;
1344         skb = rx->skb;
1345         hdr = (struct ieee80211_hdr *) skb->data;
1346
1347         if (!local->pspolling)
1348                 return RX_CONTINUE;
1349
1350         if (!ieee80211_has_fromds(hdr->frame_control))
1351                 /* this is not from AP */
1352                 return RX_CONTINUE;
1353
1354         if (!ieee80211_is_data(hdr->frame_control))
1355                 return RX_CONTINUE;
1356
1357         if (!ieee80211_has_moredata(hdr->frame_control)) {
1358                 /* AP has no more frames buffered for us */
1359                 local->pspolling = false;
1360                 return RX_CONTINUE;
1361         }
1362
1363         /* more data bit is set, let's request a new frame from the AP */
1364         ieee80211_send_pspoll(local, rx->sdata);
1365
1366         return RX_CONTINUE;
1367 }
1368
1369 static void sta_ps_start(struct sta_info *sta)
1370 {
1371         struct ieee80211_sub_if_data *sdata = sta->sdata;
1372         struct ieee80211_local *local = sdata->local;
1373         struct ps_data *ps;
1374         int tid;
1375
1376         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1377             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1378                 ps = &sdata->bss->ps;
1379         else
1380                 return;
1381
1382         atomic_inc(&ps->num_sta_ps);
1383         set_sta_flag(sta, WLAN_STA_PS_STA);
1384         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1385                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1386         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1387                sta->sta.addr, sta->sta.aid);
1388
1389         ieee80211_clear_fast_xmit(sta);
1390
1391         if (!sta->sta.txq[0])
1392                 return;
1393
1394         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1395                 if (txq_has_queue(sta->sta.txq[tid]))
1396                         set_bit(tid, &sta->txq_buffered_tids);
1397                 else
1398                         clear_bit(tid, &sta->txq_buffered_tids);
1399         }
1400 }
1401
1402 static void sta_ps_end(struct sta_info *sta)
1403 {
1404         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1405                sta->sta.addr, sta->sta.aid);
1406
1407         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1408                 /*
1409                  * Clear the flag only if the other one is still set
1410                  * so that the TX path won't start TX'ing new frames
1411                  * directly ... In the case that the driver flag isn't
1412                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1413                  */
1414                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1415                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1416                        sta->sta.addr, sta->sta.aid);
1417                 return;
1418         }
1419
1420         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1421         clear_sta_flag(sta, WLAN_STA_PS_STA);
1422         ieee80211_sta_ps_deliver_wakeup(sta);
1423 }
1424
1425 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1426 {
1427         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1428         bool in_ps;
1429
1430         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1431
1432         /* Don't let the same PS state be set twice */
1433         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1434         if ((start && in_ps) || (!start && !in_ps))
1435                 return -EINVAL;
1436
1437         if (start)
1438                 sta_ps_start(sta);
1439         else
1440                 sta_ps_end(sta);
1441
1442         return 0;
1443 }
1444 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1445
1446 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1447 {
1448         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1449
1450         if (test_sta_flag(sta, WLAN_STA_SP))
1451                 return;
1452
1453         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1454                 ieee80211_sta_ps_deliver_poll_response(sta);
1455         else
1456                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1457 }
1458 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1459
1460 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1461 {
1462         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1463         int ac = ieee80211_ac_from_tid(tid);
1464
1465         /*
1466          * If this AC is not trigger-enabled do nothing unless the
1467          * driver is calling us after it already checked.
1468          *
1469          * NB: This could/should check a separate bitmap of trigger-
1470          * enabled queues, but for now we only implement uAPSD w/o
1471          * TSPEC changes to the ACs, so they're always the same.
1472          */
1473         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1474             tid != IEEE80211_NUM_TIDS)
1475                 return;
1476
1477         /* if we are in a service period, do nothing */
1478         if (test_sta_flag(sta, WLAN_STA_SP))
1479                 return;
1480
1481         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1482                 ieee80211_sta_ps_deliver_uapsd(sta);
1483         else
1484                 set_sta_flag(sta, WLAN_STA_UAPSD);
1485 }
1486 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1487
1488 static ieee80211_rx_result debug_noinline
1489 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1490 {
1491         struct ieee80211_sub_if_data *sdata = rx->sdata;
1492         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1493         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1494
1495         if (!rx->sta)
1496                 return RX_CONTINUE;
1497
1498         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1499             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1500                 return RX_CONTINUE;
1501
1502         /*
1503          * The device handles station powersave, so don't do anything about
1504          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1505          * it to mac80211 since they're handled.)
1506          */
1507         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1508                 return RX_CONTINUE;
1509
1510         /*
1511          * Don't do anything if the station isn't already asleep. In
1512          * the uAPSD case, the station will probably be marked asleep,
1513          * in the PS-Poll case the station must be confused ...
1514          */
1515         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1516                 return RX_CONTINUE;
1517
1518         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1519                 ieee80211_sta_pspoll(&rx->sta->sta);
1520
1521                 /* Free PS Poll skb here instead of returning RX_DROP that would
1522                  * count as an dropped frame. */
1523                 dev_kfree_skb(rx->skb);
1524
1525                 return RX_QUEUED;
1526         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1527                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1528                    ieee80211_has_pm(hdr->frame_control) &&
1529                    (ieee80211_is_data_qos(hdr->frame_control) ||
1530                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1531                 u8 tid = ieee80211_get_tid(hdr);
1532
1533                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1534         }
1535
1536         return RX_CONTINUE;
1537 }
1538
1539 static ieee80211_rx_result debug_noinline
1540 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1541 {
1542         struct sta_info *sta = rx->sta;
1543         struct sk_buff *skb = rx->skb;
1544         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1545         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1546         int i;
1547
1548         if (!sta)
1549                 return RX_CONTINUE;
1550
1551         /*
1552          * Update last_rx only for IBSS packets which are for the current
1553          * BSSID and for station already AUTHORIZED to avoid keeping the
1554          * current IBSS network alive in cases where other STAs start
1555          * using different BSSID. This will also give the station another
1556          * chance to restart the authentication/authorization in case
1557          * something went wrong the first time.
1558          */
1559         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1560                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1561                                                 NL80211_IFTYPE_ADHOC);
1562                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1563                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1564                         sta->rx_stats.last_rx = jiffies;
1565                         if (ieee80211_is_data(hdr->frame_control) &&
1566                             !is_multicast_ether_addr(hdr->addr1))
1567                                 sta->rx_stats.last_rate =
1568                                         sta_stats_encode_rate(status);
1569                 }
1570         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1571                 sta->rx_stats.last_rx = jiffies;
1572         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1573                 /*
1574                  * Mesh beacons will update last_rx when if they are found to
1575                  * match the current local configuration when processed.
1576                  */
1577                 sta->rx_stats.last_rx = jiffies;
1578                 if (ieee80211_is_data(hdr->frame_control))
1579                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1580         }
1581
1582         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1583                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1584
1585         sta->rx_stats.fragments++;
1586
1587         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1588         sta->rx_stats.bytes += rx->skb->len;
1589         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1590
1591         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1592                 sta->rx_stats.last_signal = status->signal;
1593                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1594         }
1595
1596         if (status->chains) {
1597                 sta->rx_stats.chains = status->chains;
1598                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1599                         int signal = status->chain_signal[i];
1600
1601                         if (!(status->chains & BIT(i)))
1602                                 continue;
1603
1604                         sta->rx_stats.chain_signal_last[i] = signal;
1605                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1606                                         -signal);
1607                 }
1608         }
1609
1610         /*
1611          * Change STA power saving mode only at the end of a frame
1612          * exchange sequence, and only for a data or management
1613          * frame as specified in IEEE 802.11-2016 11.2.3.2
1614          */
1615         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1616             !ieee80211_has_morefrags(hdr->frame_control) &&
1617             (ieee80211_is_mgmt(hdr->frame_control) ||
1618              ieee80211_is_data(hdr->frame_control)) &&
1619             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1620             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1621              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1622                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1623                         if (!ieee80211_has_pm(hdr->frame_control))
1624                                 sta_ps_end(sta);
1625                 } else {
1626                         if (ieee80211_has_pm(hdr->frame_control))
1627                                 sta_ps_start(sta);
1628                 }
1629         }
1630
1631         /* mesh power save support */
1632         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1633                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1634
1635         /*
1636          * Drop (qos-)data::nullfunc frames silently, since they
1637          * are used only to control station power saving mode.
1638          */
1639         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1640             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1641                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1642
1643                 /*
1644                  * If we receive a 4-addr nullfunc frame from a STA
1645                  * that was not moved to a 4-addr STA vlan yet send
1646                  * the event to userspace and for older hostapd drop
1647                  * the frame to the monitor interface.
1648                  */
1649                 if (ieee80211_has_a4(hdr->frame_control) &&
1650                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1651                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1652                       !rx->sdata->u.vlan.sta))) {
1653                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1654                                 cfg80211_rx_unexpected_4addr_frame(
1655                                         rx->sdata->dev, sta->sta.addr,
1656                                         GFP_ATOMIC);
1657                         return RX_DROP_MONITOR;
1658                 }
1659                 /*
1660                  * Update counter and free packet here to avoid
1661                  * counting this as a dropped packed.
1662                  */
1663                 sta->rx_stats.packets++;
1664                 dev_kfree_skb(rx->skb);
1665                 return RX_QUEUED;
1666         }
1667
1668         return RX_CONTINUE;
1669 } /* ieee80211_rx_h_sta_process */
1670
1671 static ieee80211_rx_result debug_noinline
1672 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1673 {
1674         struct sk_buff *skb = rx->skb;
1675         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1676         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1677         int keyidx;
1678         int hdrlen;
1679         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1680         struct ieee80211_key *sta_ptk = NULL;
1681         int mmie_keyidx = -1;
1682         __le16 fc;
1683         const struct ieee80211_cipher_scheme *cs = NULL;
1684
1685         /*
1686          * Key selection 101
1687          *
1688          * There are four types of keys:
1689          *  - GTK (group keys)
1690          *  - IGTK (group keys for management frames)
1691          *  - PTK (pairwise keys)
1692          *  - STK (station-to-station pairwise keys)
1693          *
1694          * When selecting a key, we have to distinguish between multicast
1695          * (including broadcast) and unicast frames, the latter can only
1696          * use PTKs and STKs while the former always use GTKs and IGTKs.
1697          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1698          * unicast frames can also use key indices like GTKs. Hence, if we
1699          * don't have a PTK/STK we check the key index for a WEP key.
1700          *
1701          * Note that in a regular BSS, multicast frames are sent by the
1702          * AP only, associated stations unicast the frame to the AP first
1703          * which then multicasts it on their behalf.
1704          *
1705          * There is also a slight problem in IBSS mode: GTKs are negotiated
1706          * with each station, that is something we don't currently handle.
1707          * The spec seems to expect that one negotiates the same key with
1708          * every station but there's no such requirement; VLANs could be
1709          * possible.
1710          */
1711
1712         /* start without a key */
1713         rx->key = NULL;
1714         fc = hdr->frame_control;
1715
1716         if (rx->sta) {
1717                 int keyid = rx->sta->ptk_idx;
1718
1719                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1720                         cs = rx->sta->cipher_scheme;
1721                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1722                         if (unlikely(keyid < 0))
1723                                 return RX_DROP_UNUSABLE;
1724                 }
1725                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1726         }
1727
1728         if (!ieee80211_has_protected(fc))
1729                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1730
1731         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1732                 rx->key = sta_ptk;
1733                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1734                     (status->flag & RX_FLAG_IV_STRIPPED))
1735                         return RX_CONTINUE;
1736                 /* Skip decryption if the frame is not protected. */
1737                 if (!ieee80211_has_protected(fc))
1738                         return RX_CONTINUE;
1739         } else if (mmie_keyidx >= 0) {
1740                 /* Broadcast/multicast robust management frame / BIP */
1741                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1742                     (status->flag & RX_FLAG_IV_STRIPPED))
1743                         return RX_CONTINUE;
1744
1745                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1746                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1747                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1748                 if (rx->sta) {
1749                         if (ieee80211_is_group_privacy_action(skb) &&
1750                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1751                                 return RX_DROP_MONITOR;
1752
1753                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1754                 }
1755                 if (!rx->key)
1756                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1757         } else if (!ieee80211_has_protected(fc)) {
1758                 /*
1759                  * The frame was not protected, so skip decryption. However, we
1760                  * need to set rx->key if there is a key that could have been
1761                  * used so that the frame may be dropped if encryption would
1762                  * have been expected.
1763                  */
1764                 struct ieee80211_key *key = NULL;
1765                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1766                 int i;
1767
1768                 if (ieee80211_is_mgmt(fc) &&
1769                     is_multicast_ether_addr(hdr->addr1) &&
1770                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1771                         rx->key = key;
1772                 else {
1773                         if (rx->sta) {
1774                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1775                                         key = rcu_dereference(rx->sta->gtk[i]);
1776                                         if (key)
1777                                                 break;
1778                                 }
1779                         }
1780                         if (!key) {
1781                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1782                                         key = rcu_dereference(sdata->keys[i]);
1783                                         if (key)
1784                                                 break;
1785                                 }
1786                         }
1787                         if (key)
1788                                 rx->key = key;
1789                 }
1790                 return RX_CONTINUE;
1791         } else {
1792                 u8 keyid;
1793
1794                 /*
1795                  * The device doesn't give us the IV so we won't be
1796                  * able to look up the key. That's ok though, we
1797                  * don't need to decrypt the frame, we just won't
1798                  * be able to keep statistics accurate.
1799                  * Except for key threshold notifications, should
1800                  * we somehow allow the driver to tell us which key
1801                  * the hardware used if this flag is set?
1802                  */
1803                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1804                     (status->flag & RX_FLAG_IV_STRIPPED))
1805                         return RX_CONTINUE;
1806
1807                 hdrlen = ieee80211_hdrlen(fc);
1808
1809                 if (cs) {
1810                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1811
1812                         if (unlikely(keyidx < 0))
1813                                 return RX_DROP_UNUSABLE;
1814                 } else {
1815                         if (rx->skb->len < 8 + hdrlen)
1816                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1817                         /*
1818                          * no need to call ieee80211_wep_get_keyidx,
1819                          * it verifies a bunch of things we've done already
1820                          */
1821                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1822                         keyidx = keyid >> 6;
1823                 }
1824
1825                 /* check per-station GTK first, if multicast packet */
1826                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1827                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1828
1829                 /* if not found, try default key */
1830                 if (!rx->key) {
1831                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1832
1833                         /*
1834                          * RSNA-protected unicast frames should always be
1835                          * sent with pairwise or station-to-station keys,
1836                          * but for WEP we allow using a key index as well.
1837                          */
1838                         if (rx->key &&
1839                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1840                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1841                             !is_multicast_ether_addr(hdr->addr1))
1842                                 rx->key = NULL;
1843                 }
1844         }
1845
1846         if (rx->key) {
1847                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1848                         return RX_DROP_MONITOR;
1849
1850                 /* TODO: add threshold stuff again */
1851         } else {
1852                 return RX_DROP_MONITOR;
1853         }
1854
1855         switch (rx->key->conf.cipher) {
1856         case WLAN_CIPHER_SUITE_WEP40:
1857         case WLAN_CIPHER_SUITE_WEP104:
1858                 result = ieee80211_crypto_wep_decrypt(rx);
1859                 break;
1860         case WLAN_CIPHER_SUITE_TKIP:
1861                 result = ieee80211_crypto_tkip_decrypt(rx);
1862                 break;
1863         case WLAN_CIPHER_SUITE_CCMP:
1864                 result = ieee80211_crypto_ccmp_decrypt(
1865                         rx, IEEE80211_CCMP_MIC_LEN);
1866                 break;
1867         case WLAN_CIPHER_SUITE_CCMP_256:
1868                 result = ieee80211_crypto_ccmp_decrypt(
1869                         rx, IEEE80211_CCMP_256_MIC_LEN);
1870                 break;
1871         case WLAN_CIPHER_SUITE_AES_CMAC:
1872                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1873                 break;
1874         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1875                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1876                 break;
1877         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1878         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1879                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1880                 break;
1881         case WLAN_CIPHER_SUITE_GCMP:
1882         case WLAN_CIPHER_SUITE_GCMP_256:
1883                 result = ieee80211_crypto_gcmp_decrypt(rx);
1884                 break;
1885         default:
1886                 result = ieee80211_crypto_hw_decrypt(rx);
1887         }
1888
1889         /* the hdr variable is invalid after the decrypt handlers */
1890
1891         /* either the frame has been decrypted or will be dropped */
1892         status->flag |= RX_FLAG_DECRYPTED;
1893
1894         return result;
1895 }
1896
1897 static inline struct ieee80211_fragment_entry *
1898 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1899                          unsigned int frag, unsigned int seq, int rx_queue,
1900                          struct sk_buff **skb)
1901 {
1902         struct ieee80211_fragment_entry *entry;
1903
1904         entry = &sdata->fragments[sdata->fragment_next++];
1905         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1906                 sdata->fragment_next = 0;
1907
1908         if (!skb_queue_empty(&entry->skb_list))
1909                 __skb_queue_purge(&entry->skb_list);
1910
1911         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1912         *skb = NULL;
1913         entry->first_frag_time = jiffies;
1914         entry->seq = seq;
1915         entry->rx_queue = rx_queue;
1916         entry->last_frag = frag;
1917         entry->check_sequential_pn = false;
1918         entry->extra_len = 0;
1919
1920         return entry;
1921 }
1922
1923 static inline struct ieee80211_fragment_entry *
1924 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1925                           unsigned int frag, unsigned int seq,
1926                           int rx_queue, struct ieee80211_hdr *hdr)
1927 {
1928         struct ieee80211_fragment_entry *entry;
1929         int i, idx;
1930
1931         idx = sdata->fragment_next;
1932         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1933                 struct ieee80211_hdr *f_hdr;
1934
1935                 idx--;
1936                 if (idx < 0)
1937                         idx = IEEE80211_FRAGMENT_MAX - 1;
1938
1939                 entry = &sdata->fragments[idx];
1940                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1941                     entry->rx_queue != rx_queue ||
1942                     entry->last_frag + 1 != frag)
1943                         continue;
1944
1945                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1946
1947                 /*
1948                  * Check ftype and addresses are equal, else check next fragment
1949                  */
1950                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1951                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1952                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1953                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1954                         continue;
1955
1956                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1957                         __skb_queue_purge(&entry->skb_list);
1958                         continue;
1959                 }
1960                 return entry;
1961         }
1962
1963         return NULL;
1964 }
1965
1966 static ieee80211_rx_result debug_noinline
1967 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1968 {
1969         struct ieee80211_hdr *hdr;
1970         u16 sc;
1971         __le16 fc;
1972         unsigned int frag, seq;
1973         struct ieee80211_fragment_entry *entry;
1974         struct sk_buff *skb;
1975
1976         hdr = (struct ieee80211_hdr *)rx->skb->data;
1977         fc = hdr->frame_control;
1978
1979         if (ieee80211_is_ctl(fc))
1980                 return RX_CONTINUE;
1981
1982         sc = le16_to_cpu(hdr->seq_ctrl);
1983         frag = sc & IEEE80211_SCTL_FRAG;
1984
1985         if (is_multicast_ether_addr(hdr->addr1)) {
1986                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1987                 goto out_no_led;
1988         }
1989
1990         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1991                 goto out;
1992
1993         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1994
1995         if (skb_linearize(rx->skb))
1996                 return RX_DROP_UNUSABLE;
1997
1998         /*
1999          *  skb_linearize() might change the skb->data and
2000          *  previously cached variables (in this case, hdr) need to
2001          *  be refreshed with the new data.
2002          */
2003         hdr = (struct ieee80211_hdr *)rx->skb->data;
2004         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2005
2006         if (frag == 0) {
2007                 /* This is the first fragment of a new frame. */
2008                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2009                                                  rx->seqno_idx, &(rx->skb));
2010                 if (rx->key &&
2011                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2012                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2013                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2014                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2015                     ieee80211_has_protected(fc)) {
2016                         int queue = rx->security_idx;
2017
2018                         /* Store CCMP/GCMP PN so that we can verify that the
2019                          * next fragment has a sequential PN value.
2020                          */
2021                         entry->check_sequential_pn = true;
2022                         memcpy(entry->last_pn,
2023                                rx->key->u.ccmp.rx_pn[queue],
2024                                IEEE80211_CCMP_PN_LEN);
2025                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2026                                               u.ccmp.rx_pn) !=
2027                                      offsetof(struct ieee80211_key,
2028                                               u.gcmp.rx_pn));
2029                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2030                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2031                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2032                                      IEEE80211_GCMP_PN_LEN);
2033                 }
2034                 return RX_QUEUED;
2035         }
2036
2037         /* This is a fragment for a frame that should already be pending in
2038          * fragment cache. Add this fragment to the end of the pending entry.
2039          */
2040         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2041                                           rx->seqno_idx, hdr);
2042         if (!entry) {
2043                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2044                 return RX_DROP_MONITOR;
2045         }
2046
2047         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2048          *  MPDU PN values are not incrementing in steps of 1."
2049          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2050          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2051          */
2052         if (entry->check_sequential_pn) {
2053                 int i;
2054                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2055                 int queue;
2056
2057                 if (!rx->key ||
2058                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2059                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2060                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2061                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2062                         return RX_DROP_UNUSABLE;
2063                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2064                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2065                         pn[i]++;
2066                         if (pn[i])
2067                                 break;
2068                 }
2069                 queue = rx->security_idx;
2070                 rpn = rx->key->u.ccmp.rx_pn[queue];
2071                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2072                         return RX_DROP_UNUSABLE;
2073                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2074         }
2075
2076         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2077         __skb_queue_tail(&entry->skb_list, rx->skb);
2078         entry->last_frag = frag;
2079         entry->extra_len += rx->skb->len;
2080         if (ieee80211_has_morefrags(fc)) {
2081                 rx->skb = NULL;
2082                 return RX_QUEUED;
2083         }
2084
2085         rx->skb = __skb_dequeue(&entry->skb_list);
2086         if (skb_tailroom(rx->skb) < entry->extra_len) {
2087                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2088                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2089                                               GFP_ATOMIC))) {
2090                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2091                         __skb_queue_purge(&entry->skb_list);
2092                         return RX_DROP_UNUSABLE;
2093                 }
2094         }
2095         while ((skb = __skb_dequeue(&entry->skb_list))) {
2096                 skb_put_data(rx->skb, skb->data, skb->len);
2097                 dev_kfree_skb(skb);
2098         }
2099
2100  out:
2101         ieee80211_led_rx(rx->local);
2102  out_no_led:
2103         if (rx->sta)
2104                 rx->sta->rx_stats.packets++;
2105         return RX_CONTINUE;
2106 }
2107
2108 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2109 {
2110         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2111                 return -EACCES;
2112
2113         return 0;
2114 }
2115
2116 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2117 {
2118         struct sk_buff *skb = rx->skb;
2119         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2120
2121         /*
2122          * Pass through unencrypted frames if the hardware has
2123          * decrypted them already.
2124          */
2125         if (status->flag & RX_FLAG_DECRYPTED)
2126                 return 0;
2127
2128         /* Drop unencrypted frames if key is set. */
2129         if (unlikely(!ieee80211_has_protected(fc) &&
2130                      !ieee80211_is_nullfunc(fc) &&
2131                      ieee80211_is_data(fc) && rx->key))
2132                 return -EACCES;
2133
2134         return 0;
2135 }
2136
2137 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2138 {
2139         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2140         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2141         __le16 fc = hdr->frame_control;
2142
2143         /*
2144          * Pass through unencrypted frames if the hardware has
2145          * decrypted them already.
2146          */
2147         if (status->flag & RX_FLAG_DECRYPTED)
2148                 return 0;
2149
2150         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2151                 if (unlikely(!ieee80211_has_protected(fc) &&
2152                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2153                              rx->key)) {
2154                         if (ieee80211_is_deauth(fc) ||
2155                             ieee80211_is_disassoc(fc))
2156                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2157                                                              rx->skb->data,
2158                                                              rx->skb->len);
2159                         return -EACCES;
2160                 }
2161                 /* BIP does not use Protected field, so need to check MMIE */
2162                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2163                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2164                         if (ieee80211_is_deauth(fc) ||
2165                             ieee80211_is_disassoc(fc))
2166                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2167                                                              rx->skb->data,
2168                                                              rx->skb->len);
2169                         return -EACCES;
2170                 }
2171                 /*
2172                  * When using MFP, Action frames are not allowed prior to
2173                  * having configured keys.
2174                  */
2175                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2176                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2177                         return -EACCES;
2178         }
2179
2180         return 0;
2181 }
2182
2183 static int
2184 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2185 {
2186         struct ieee80211_sub_if_data *sdata = rx->sdata;
2187         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2188         bool check_port_control = false;
2189         struct ethhdr *ehdr;
2190         int ret;
2191
2192         *port_control = false;
2193         if (ieee80211_has_a4(hdr->frame_control) &&
2194             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2195                 return -1;
2196
2197         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2198             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2199
2200                 if (!sdata->u.mgd.use_4addr)
2201                         return -1;
2202                 else
2203                         check_port_control = true;
2204         }
2205
2206         if (is_multicast_ether_addr(hdr->addr1) &&
2207             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2208                 return -1;
2209
2210         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2211         if (ret < 0)
2212                 return ret;
2213
2214         ehdr = (struct ethhdr *) rx->skb->data;
2215         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2216                 *port_control = true;
2217         else if (check_port_control)
2218                 return -1;
2219
2220         return 0;
2221 }
2222
2223 /*
2224  * requires that rx->skb is a frame with ethernet header
2225  */
2226 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2227 {
2228         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2229                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2230         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2231
2232         /*
2233          * Allow EAPOL frames to us/the PAE group address regardless
2234          * of whether the frame was encrypted or not.
2235          */
2236         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2237             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2238              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2239                 return true;
2240
2241         if (ieee80211_802_1x_port_control(rx) ||
2242             ieee80211_drop_unencrypted(rx, fc))
2243                 return false;
2244
2245         return true;
2246 }
2247
2248 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2249                                                  struct ieee80211_rx_data *rx)
2250 {
2251         struct ieee80211_sub_if_data *sdata = rx->sdata;
2252         struct net_device *dev = sdata->dev;
2253
2254         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2255                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2256                      sdata->control_port_over_nl80211)) {
2257                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2258                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2259                 struct ethhdr *ehdr = eth_hdr(skb);
2260
2261                 cfg80211_rx_control_port(dev, skb->data, skb->len,
2262                                          ehdr->h_source,
2263                                          be16_to_cpu(skb->protocol), noencrypt);
2264                 dev_kfree_skb(skb);
2265         } else {
2266                 /* deliver to local stack */
2267                 if (rx->napi)
2268                         napi_gro_receive(rx->napi, skb);
2269                 else
2270                         netif_receive_skb(skb);
2271         }
2272 }
2273
2274 /*
2275  * requires that rx->skb is a frame with ethernet header
2276  */
2277 static void
2278 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2279 {
2280         struct ieee80211_sub_if_data *sdata = rx->sdata;
2281         struct net_device *dev = sdata->dev;
2282         struct sk_buff *skb, *xmit_skb;
2283         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2284         struct sta_info *dsta;
2285
2286         skb = rx->skb;
2287         xmit_skb = NULL;
2288
2289         ieee80211_rx_stats(dev, skb->len);
2290
2291         if (rx->sta) {
2292                 /* The seqno index has the same property as needed
2293                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2294                  * for non-QoS-data frames. Here we know it's a data
2295                  * frame, so count MSDUs.
2296                  */
2297                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2298                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2299                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2300         }
2301
2302         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2303              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2304             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2305             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2306                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2307                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2308                         /*
2309                          * send multicast frames both to higher layers in
2310                          * local net stack and back to the wireless medium
2311                          */
2312                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2313                         if (!xmit_skb)
2314                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2315                                                     dev->name);
2316                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2317                         dsta = sta_info_get(sdata, skb->data);
2318                         if (dsta) {
2319                                 /*
2320                                  * The destination station is associated to
2321                                  * this AP (in this VLAN), so send the frame
2322                                  * directly to it and do not pass it to local
2323                                  * net stack.
2324                                  */
2325                                 xmit_skb = skb;
2326                                 skb = NULL;
2327                         }
2328                 }
2329         }
2330
2331 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2332         if (skb) {
2333                 /* 'align' will only take the values 0 or 2 here since all
2334                  * frames are required to be aligned to 2-byte boundaries
2335                  * when being passed to mac80211; the code here works just
2336                  * as well if that isn't true, but mac80211 assumes it can
2337                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2338                  */
2339                 int align;
2340
2341                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2342                 if (align) {
2343                         if (WARN_ON(skb_headroom(skb) < 3)) {
2344                                 dev_kfree_skb(skb);
2345                                 skb = NULL;
2346                         } else {
2347                                 u8 *data = skb->data;
2348                                 size_t len = skb_headlen(skb);
2349                                 skb->data -= align;
2350                                 memmove(skb->data, data, len);
2351                                 skb_set_tail_pointer(skb, len);
2352                         }
2353                 }
2354         }
2355 #endif
2356
2357         if (skb) {
2358                 skb->protocol = eth_type_trans(skb, dev);
2359                 memset(skb->cb, 0, sizeof(skb->cb));
2360
2361                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2362         }
2363
2364         if (xmit_skb) {
2365                 /*
2366                  * Send to wireless media and increase priority by 256 to
2367                  * keep the received priority instead of reclassifying
2368                  * the frame (see cfg80211_classify8021d).
2369                  */
2370                 xmit_skb->priority += 256;
2371                 xmit_skb->protocol = htons(ETH_P_802_3);
2372                 skb_reset_network_header(xmit_skb);
2373                 skb_reset_mac_header(xmit_skb);
2374                 dev_queue_xmit(xmit_skb);
2375         }
2376 }
2377
2378 static ieee80211_rx_result debug_noinline
2379 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2380 {
2381         struct net_device *dev = rx->sdata->dev;
2382         struct sk_buff *skb = rx->skb;
2383         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2384         __le16 fc = hdr->frame_control;
2385         struct sk_buff_head frame_list;
2386         struct ethhdr ethhdr;
2387         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2388
2389         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2390                 check_da = NULL;
2391                 check_sa = NULL;
2392         } else switch (rx->sdata->vif.type) {
2393                 case NL80211_IFTYPE_AP:
2394                 case NL80211_IFTYPE_AP_VLAN:
2395                         check_da = NULL;
2396                         break;
2397                 case NL80211_IFTYPE_STATION:
2398                         if (!rx->sta ||
2399                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2400                                 check_sa = NULL;
2401                         break;
2402                 case NL80211_IFTYPE_MESH_POINT:
2403                         check_sa = NULL;
2404                         break;
2405                 default:
2406                         break;
2407         }
2408
2409         skb->dev = dev;
2410         __skb_queue_head_init(&frame_list);
2411
2412         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2413                                           rx->sdata->vif.addr,
2414                                           rx->sdata->vif.type,
2415                                           data_offset))
2416                 return RX_DROP_UNUSABLE;
2417
2418         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2419                                  rx->sdata->vif.type,
2420                                  rx->local->hw.extra_tx_headroom,
2421                                  check_da, check_sa);
2422
2423         while (!skb_queue_empty(&frame_list)) {
2424                 rx->skb = __skb_dequeue(&frame_list);
2425
2426                 if (!ieee80211_frame_allowed(rx, fc)) {
2427                         dev_kfree_skb(rx->skb);
2428                         continue;
2429                 }
2430
2431                 ieee80211_deliver_skb(rx);
2432         }
2433
2434         return RX_QUEUED;
2435 }
2436
2437 static ieee80211_rx_result debug_noinline
2438 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2439 {
2440         struct sk_buff *skb = rx->skb;
2441         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2442         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2443         __le16 fc = hdr->frame_control;
2444
2445         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2446                 return RX_CONTINUE;
2447
2448         if (unlikely(!ieee80211_is_data(fc)))
2449                 return RX_CONTINUE;
2450
2451         if (unlikely(!ieee80211_is_data_present(fc)))
2452                 return RX_DROP_MONITOR;
2453
2454         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2455                 switch (rx->sdata->vif.type) {
2456                 case NL80211_IFTYPE_AP_VLAN:
2457                         if (!rx->sdata->u.vlan.sta)
2458                                 return RX_DROP_UNUSABLE;
2459                         break;
2460                 case NL80211_IFTYPE_STATION:
2461                         if (!rx->sdata->u.mgd.use_4addr)
2462                                 return RX_DROP_UNUSABLE;
2463                         break;
2464                 default:
2465                         return RX_DROP_UNUSABLE;
2466                 }
2467         }
2468
2469         if (is_multicast_ether_addr(hdr->addr1))
2470                 return RX_DROP_UNUSABLE;
2471
2472         return __ieee80211_rx_h_amsdu(rx, 0);
2473 }
2474
2475 #ifdef CONFIG_MAC80211_MESH
2476 static ieee80211_rx_result
2477 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2478 {
2479         struct ieee80211_hdr *fwd_hdr, *hdr;
2480         struct ieee80211_tx_info *info;
2481         struct ieee80211s_hdr *mesh_hdr;
2482         struct sk_buff *skb = rx->skb, *fwd_skb;
2483         struct ieee80211_local *local = rx->local;
2484         struct ieee80211_sub_if_data *sdata = rx->sdata;
2485         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2486         u16 ac, q, hdrlen;
2487
2488         hdr = (struct ieee80211_hdr *) skb->data;
2489         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2490
2491         /* make sure fixed part of mesh header is there, also checks skb len */
2492         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2493                 return RX_DROP_MONITOR;
2494
2495         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2496
2497         /* make sure full mesh header is there, also checks skb len */
2498         if (!pskb_may_pull(rx->skb,
2499                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2500                 return RX_DROP_MONITOR;
2501
2502         /* reload pointers */
2503         hdr = (struct ieee80211_hdr *) skb->data;
2504         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2505
2506         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2507                 return RX_DROP_MONITOR;
2508
2509         /* frame is in RMC, don't forward */
2510         if (ieee80211_is_data(hdr->frame_control) &&
2511             is_multicast_ether_addr(hdr->addr1) &&
2512             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2513                 return RX_DROP_MONITOR;
2514
2515         if (!ieee80211_is_data(hdr->frame_control))
2516                 return RX_CONTINUE;
2517
2518         if (!mesh_hdr->ttl)
2519                 return RX_DROP_MONITOR;
2520
2521         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2522                 struct mesh_path *mppath;
2523                 char *proxied_addr;
2524                 char *mpp_addr;
2525
2526                 if (is_multicast_ether_addr(hdr->addr1)) {
2527                         mpp_addr = hdr->addr3;
2528                         proxied_addr = mesh_hdr->eaddr1;
2529                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2530                             MESH_FLAGS_AE_A5_A6) {
2531                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2532                         mpp_addr = hdr->addr4;
2533                         proxied_addr = mesh_hdr->eaddr2;
2534                 } else {
2535                         return RX_DROP_MONITOR;
2536                 }
2537
2538                 rcu_read_lock();
2539                 mppath = mpp_path_lookup(sdata, proxied_addr);
2540                 if (!mppath) {
2541                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2542                 } else {
2543                         spin_lock_bh(&mppath->state_lock);
2544                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2545                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2546                         mppath->exp_time = jiffies;
2547                         spin_unlock_bh(&mppath->state_lock);
2548                 }
2549                 rcu_read_unlock();
2550         }
2551
2552         /* Frame has reached destination.  Don't forward */
2553         if (!is_multicast_ether_addr(hdr->addr1) &&
2554             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2555                 return RX_CONTINUE;
2556
2557         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2558         q = sdata->vif.hw_queue[ac];
2559         if (ieee80211_queue_stopped(&local->hw, q)) {
2560                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2561                 return RX_DROP_MONITOR;
2562         }
2563         skb_set_queue_mapping(skb, q);
2564
2565         if (!--mesh_hdr->ttl) {
2566                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2567                 goto out;
2568         }
2569
2570         if (!ifmsh->mshcfg.dot11MeshForwarding)
2571                 goto out;
2572
2573         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2574                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2575         if (!fwd_skb)
2576                 goto out;
2577
2578         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2579         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2580         info = IEEE80211_SKB_CB(fwd_skb);
2581         memset(info, 0, sizeof(*info));
2582         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2583         info->control.vif = &rx->sdata->vif;
2584         info->control.jiffies = jiffies;
2585         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2586                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2587                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2588                 /* update power mode indication when forwarding */
2589                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2590         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2591                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2592                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2593         } else {
2594                 /* unable to resolve next hop */
2595                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2596                                    fwd_hdr->addr3, 0,
2597                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2598                                    fwd_hdr->addr2);
2599                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2600                 kfree_skb(fwd_skb);
2601                 return RX_DROP_MONITOR;
2602         }
2603
2604         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2605         ieee80211_add_pending_skb(local, fwd_skb);
2606  out:
2607         if (is_multicast_ether_addr(hdr->addr1))
2608                 return RX_CONTINUE;
2609         return RX_DROP_MONITOR;
2610 }
2611 #endif
2612
2613 static ieee80211_rx_result debug_noinline
2614 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2615 {
2616         struct ieee80211_sub_if_data *sdata = rx->sdata;
2617         struct ieee80211_local *local = rx->local;
2618         struct net_device *dev = sdata->dev;
2619         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2620         __le16 fc = hdr->frame_control;
2621         bool port_control;
2622         int err;
2623
2624         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2625                 return RX_CONTINUE;
2626
2627         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2628                 return RX_DROP_MONITOR;
2629
2630         /*
2631          * Send unexpected-4addr-frame event to hostapd. For older versions,
2632          * also drop the frame to cooked monitor interfaces.
2633          */
2634         if (ieee80211_has_a4(hdr->frame_control) &&
2635             sdata->vif.type == NL80211_IFTYPE_AP) {
2636                 if (rx->sta &&
2637                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2638                         cfg80211_rx_unexpected_4addr_frame(
2639                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2640                 return RX_DROP_MONITOR;
2641         }
2642
2643         err = __ieee80211_data_to_8023(rx, &port_control);
2644         if (unlikely(err))
2645                 return RX_DROP_UNUSABLE;
2646
2647         if (!ieee80211_frame_allowed(rx, fc))
2648                 return RX_DROP_MONITOR;
2649
2650         /* directly handle TDLS channel switch requests/responses */
2651         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2652                                                 cpu_to_be16(ETH_P_TDLS))) {
2653                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2654
2655                 if (pskb_may_pull(rx->skb,
2656                                   offsetof(struct ieee80211_tdls_data, u)) &&
2657                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2658                     tf->category == WLAN_CATEGORY_TDLS &&
2659                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2660                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2661                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2662                         schedule_work(&local->tdls_chsw_work);
2663                         if (rx->sta)
2664                                 rx->sta->rx_stats.packets++;
2665
2666                         return RX_QUEUED;
2667                 }
2668         }
2669
2670         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2671             unlikely(port_control) && sdata->bss) {
2672                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2673                                      u.ap);
2674                 dev = sdata->dev;
2675                 rx->sdata = sdata;
2676         }
2677
2678         rx->skb->dev = dev;
2679
2680         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2681             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2682             !is_multicast_ether_addr(
2683                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2684             (!local->scanning &&
2685              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2686                 mod_timer(&local->dynamic_ps_timer, jiffies +
2687                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2688
2689         ieee80211_deliver_skb(rx);
2690
2691         return RX_QUEUED;
2692 }
2693
2694 static ieee80211_rx_result debug_noinline
2695 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2696 {
2697         struct sk_buff *skb = rx->skb;
2698         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2699         struct tid_ampdu_rx *tid_agg_rx;
2700         u16 start_seq_num;
2701         u16 tid;
2702
2703         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2704                 return RX_CONTINUE;
2705
2706         if (ieee80211_is_back_req(bar->frame_control)) {
2707                 struct {
2708                         __le16 control, start_seq_num;
2709                 } __packed bar_data;
2710                 struct ieee80211_event event = {
2711                         .type = BAR_RX_EVENT,
2712                 };
2713
2714                 if (!rx->sta)
2715                         return RX_DROP_MONITOR;
2716
2717                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2718                                   &bar_data, sizeof(bar_data)))
2719                         return RX_DROP_MONITOR;
2720
2721                 tid = le16_to_cpu(bar_data.control) >> 12;
2722
2723                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2724                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2725                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2726                                              WLAN_BACK_RECIPIENT,
2727                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2728
2729                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2730                 if (!tid_agg_rx)
2731                         return RX_DROP_MONITOR;
2732
2733                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2734                 event.u.ba.tid = tid;
2735                 event.u.ba.ssn = start_seq_num;
2736                 event.u.ba.sta = &rx->sta->sta;
2737
2738                 /* reset session timer */
2739                 if (tid_agg_rx->timeout)
2740                         mod_timer(&tid_agg_rx->session_timer,
2741                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2742
2743                 spin_lock(&tid_agg_rx->reorder_lock);
2744                 /* release stored frames up to start of BAR */
2745                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2746                                                  start_seq_num, frames);
2747                 spin_unlock(&tid_agg_rx->reorder_lock);
2748
2749                 drv_event_callback(rx->local, rx->sdata, &event);
2750
2751                 kfree_skb(skb);
2752                 return RX_QUEUED;
2753         }
2754
2755         /*
2756          * After this point, we only want management frames,
2757          * so we can drop all remaining control frames to
2758          * cooked monitor interfaces.
2759          */
2760         return RX_DROP_MONITOR;
2761 }
2762
2763 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2764                                            struct ieee80211_mgmt *mgmt,
2765                                            size_t len)
2766 {
2767         struct ieee80211_local *local = sdata->local;
2768         struct sk_buff *skb;
2769         struct ieee80211_mgmt *resp;
2770
2771         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2772                 /* Not to own unicast address */
2773                 return;
2774         }
2775
2776         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2777             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2778                 /* Not from the current AP or not associated yet. */
2779                 return;
2780         }
2781
2782         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2783                 /* Too short SA Query request frame */
2784                 return;
2785         }
2786
2787         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2788         if (skb == NULL)
2789                 return;
2790
2791         skb_reserve(skb, local->hw.extra_tx_headroom);
2792         resp = skb_put_zero(skb, 24);
2793         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2794         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2795         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2796         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2797                                           IEEE80211_STYPE_ACTION);
2798         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2799         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2800         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2801         memcpy(resp->u.action.u.sa_query.trans_id,
2802                mgmt->u.action.u.sa_query.trans_id,
2803                WLAN_SA_QUERY_TR_ID_LEN);
2804
2805         ieee80211_tx_skb(sdata, skb);
2806 }
2807
2808 static ieee80211_rx_result debug_noinline
2809 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2810 {
2811         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2812         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2813
2814         /*
2815          * From here on, look only at management frames.
2816          * Data and control frames are already handled,
2817          * and unknown (reserved) frames are useless.
2818          */
2819         if (rx->skb->len < 24)
2820                 return RX_DROP_MONITOR;
2821
2822         if (!ieee80211_is_mgmt(mgmt->frame_control))
2823                 return RX_DROP_MONITOR;
2824
2825         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2826             ieee80211_is_beacon(mgmt->frame_control) &&
2827             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2828                 int sig = 0;
2829
2830                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2831                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2832                         sig = status->signal;
2833
2834                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2835                                             rx->skb->data, rx->skb->len,
2836                                             status->freq, sig);
2837                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2838         }
2839
2840         if (ieee80211_drop_unencrypted_mgmt(rx))
2841                 return RX_DROP_UNUSABLE;
2842
2843         return RX_CONTINUE;
2844 }
2845
2846 static ieee80211_rx_result debug_noinline
2847 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2848 {
2849         struct ieee80211_local *local = rx->local;
2850         struct ieee80211_sub_if_data *sdata = rx->sdata;
2851         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2852         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2853         int len = rx->skb->len;
2854
2855         if (!ieee80211_is_action(mgmt->frame_control))
2856                 return RX_CONTINUE;
2857
2858         /* drop too small frames */
2859         if (len < IEEE80211_MIN_ACTION_SIZE)
2860                 return RX_DROP_UNUSABLE;
2861
2862         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2863             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2864             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2865                 return RX_DROP_UNUSABLE;
2866
2867         switch (mgmt->u.action.category) {
2868         case WLAN_CATEGORY_HT:
2869                 /* reject HT action frames from stations not supporting HT */
2870                 if (!rx->sta->sta.ht_cap.ht_supported)
2871                         goto invalid;
2872
2873                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2874                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2875                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2876                     sdata->vif.type != NL80211_IFTYPE_AP &&
2877                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2878                         break;
2879
2880                 /* verify action & smps_control/chanwidth are present */
2881                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2882                         goto invalid;
2883
2884                 switch (mgmt->u.action.u.ht_smps.action) {
2885                 case WLAN_HT_ACTION_SMPS: {
2886                         struct ieee80211_supported_band *sband;
2887                         enum ieee80211_smps_mode smps_mode;
2888                         struct sta_opmode_info sta_opmode = {};
2889
2890                         /* convert to HT capability */
2891                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2892                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2893                                 smps_mode = IEEE80211_SMPS_OFF;
2894                                 break;
2895                         case WLAN_HT_SMPS_CONTROL_STATIC:
2896                                 smps_mode = IEEE80211_SMPS_STATIC;
2897                                 break;
2898                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2899                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2900                                 break;
2901                         default:
2902                                 goto invalid;
2903                         }
2904
2905                         /* if no change do nothing */
2906                         if (rx->sta->sta.smps_mode == smps_mode)
2907                                 goto handled;
2908                         rx->sta->sta.smps_mode = smps_mode;
2909                         sta_opmode.smps_mode =
2910                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
2911                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
2912
2913                         sband = rx->local->hw.wiphy->bands[status->band];
2914
2915                         rate_control_rate_update(local, sband, rx->sta,
2916                                                  IEEE80211_RC_SMPS_CHANGED);
2917                         cfg80211_sta_opmode_change_notify(sdata->dev,
2918                                                           rx->sta->addr,
2919                                                           &sta_opmode,
2920                                                           GFP_KERNEL);
2921                         goto handled;
2922                 }
2923                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2924                         struct ieee80211_supported_band *sband;
2925                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2926                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2927                         struct sta_opmode_info sta_opmode = {};
2928
2929                         /* If it doesn't support 40 MHz it can't change ... */
2930                         if (!(rx->sta->sta.ht_cap.cap &
2931                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2932                                 goto handled;
2933
2934                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2935                                 max_bw = IEEE80211_STA_RX_BW_20;
2936                         else
2937                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2938
2939                         /* set cur_max_bandwidth and recalc sta bw */
2940                         rx->sta->cur_max_bandwidth = max_bw;
2941                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2942
2943                         if (rx->sta->sta.bandwidth == new_bw)
2944                                 goto handled;
2945
2946                         rx->sta->sta.bandwidth = new_bw;
2947                         sband = rx->local->hw.wiphy->bands[status->band];
2948                         sta_opmode.bw =
2949                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
2950                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
2951
2952                         rate_control_rate_update(local, sband, rx->sta,
2953                                                  IEEE80211_RC_BW_CHANGED);
2954                         cfg80211_sta_opmode_change_notify(sdata->dev,
2955                                                           rx->sta->addr,
2956                                                           &sta_opmode,
2957                                                           GFP_KERNEL);
2958                         goto handled;
2959                 }
2960                 default:
2961                         goto invalid;
2962                 }
2963
2964                 break;
2965         case WLAN_CATEGORY_PUBLIC:
2966                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2967                         goto invalid;
2968                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2969                         break;
2970                 if (!rx->sta)
2971                         break;
2972                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2973                         break;
2974                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2975                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2976                         break;
2977                 if (len < offsetof(struct ieee80211_mgmt,
2978                                    u.action.u.ext_chan_switch.variable))
2979                         goto invalid;
2980                 goto queue;
2981         case WLAN_CATEGORY_VHT:
2982                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2983                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2984                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2985                     sdata->vif.type != NL80211_IFTYPE_AP &&
2986                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2987                         break;
2988
2989                 /* verify action code is present */
2990                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2991                         goto invalid;
2992
2993                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2994                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2995                         /* verify opmode is present */
2996                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2997                                 goto invalid;
2998                         goto queue;
2999                 }
3000                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3001                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3002                                 goto invalid;
3003                         goto queue;
3004                 }
3005                 default:
3006                         break;
3007                 }
3008                 break;
3009         case WLAN_CATEGORY_BACK:
3010                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3011                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3012                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3013                     sdata->vif.type != NL80211_IFTYPE_AP &&
3014                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3015                         break;
3016
3017                 /* verify action_code is present */
3018                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3019                         break;
3020
3021                 switch (mgmt->u.action.u.addba_req.action_code) {
3022                 case WLAN_ACTION_ADDBA_REQ:
3023                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3024                                    sizeof(mgmt->u.action.u.addba_req)))
3025                                 goto invalid;
3026                         break;
3027                 case WLAN_ACTION_ADDBA_RESP:
3028                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3029                                    sizeof(mgmt->u.action.u.addba_resp)))
3030                                 goto invalid;
3031                         break;
3032                 case WLAN_ACTION_DELBA:
3033                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3034                                    sizeof(mgmt->u.action.u.delba)))
3035                                 goto invalid;
3036                         break;
3037                 default:
3038                         goto invalid;
3039                 }
3040
3041                 goto queue;
3042         case WLAN_CATEGORY_SPECTRUM_MGMT:
3043                 /* verify action_code is present */
3044                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3045                         break;
3046
3047                 switch (mgmt->u.action.u.measurement.action_code) {
3048                 case WLAN_ACTION_SPCT_MSR_REQ:
3049                         if (status->band != NL80211_BAND_5GHZ)
3050                                 break;
3051
3052                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3053                                    sizeof(mgmt->u.action.u.measurement)))
3054                                 break;
3055
3056                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3057                                 break;
3058
3059                         ieee80211_process_measurement_req(sdata, mgmt, len);
3060                         goto handled;
3061                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3062                         u8 *bssid;
3063                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3064                                    sizeof(mgmt->u.action.u.chan_switch)))
3065                                 break;
3066
3067                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3068                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3069                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3070                                 break;
3071
3072                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3073                                 bssid = sdata->u.mgd.bssid;
3074                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3075                                 bssid = sdata->u.ibss.bssid;
3076                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3077                                 bssid = mgmt->sa;
3078                         else
3079                                 break;
3080
3081                         if (!ether_addr_equal(mgmt->bssid, bssid))
3082                                 break;
3083
3084                         goto queue;
3085                         }
3086                 }
3087                 break;
3088         case WLAN_CATEGORY_SA_QUERY:
3089                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3090                            sizeof(mgmt->u.action.u.sa_query)))
3091                         break;
3092
3093                 switch (mgmt->u.action.u.sa_query.action) {
3094                 case WLAN_ACTION_SA_QUERY_REQUEST:
3095                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3096                                 break;
3097                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3098                         goto handled;
3099                 }
3100                 break;
3101         case WLAN_CATEGORY_SELF_PROTECTED:
3102                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3103                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3104                         break;
3105
3106                 switch (mgmt->u.action.u.self_prot.action_code) {
3107                 case WLAN_SP_MESH_PEERING_OPEN:
3108                 case WLAN_SP_MESH_PEERING_CLOSE:
3109                 case WLAN_SP_MESH_PEERING_CONFIRM:
3110                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3111                                 goto invalid;
3112                         if (sdata->u.mesh.user_mpm)
3113                                 /* userspace handles this frame */
3114                                 break;
3115                         goto queue;
3116                 case WLAN_SP_MGK_INFORM:
3117                 case WLAN_SP_MGK_ACK:
3118                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3119                                 goto invalid;
3120                         break;
3121                 }
3122                 break;
3123         case WLAN_CATEGORY_MESH_ACTION:
3124                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3125                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3126                         break;
3127
3128                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3129                         break;
3130                 if (mesh_action_is_path_sel(mgmt) &&
3131                     !mesh_path_sel_is_hwmp(sdata))
3132                         break;
3133                 goto queue;
3134         }
3135
3136         return RX_CONTINUE;
3137
3138  invalid:
3139         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3140         /* will return in the next handlers */
3141         return RX_CONTINUE;
3142
3143  handled:
3144         if (rx->sta)
3145                 rx->sta->rx_stats.packets++;
3146         dev_kfree_skb(rx->skb);
3147         return RX_QUEUED;
3148
3149  queue:
3150         skb_queue_tail(&sdata->skb_queue, rx->skb);
3151         ieee80211_queue_work(&local->hw, &sdata->work);
3152         if (rx->sta)
3153                 rx->sta->rx_stats.packets++;
3154         return RX_QUEUED;
3155 }
3156
3157 static ieee80211_rx_result debug_noinline
3158 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3159 {
3160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3161         int sig = 0;
3162
3163         /* skip known-bad action frames and return them in the next handler */
3164         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3165                 return RX_CONTINUE;
3166
3167         /*
3168          * Getting here means the kernel doesn't know how to handle
3169          * it, but maybe userspace does ... include returned frames
3170          * so userspace can register for those to know whether ones
3171          * it transmitted were processed or returned.
3172          */
3173
3174         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3175             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3176                 sig = status->signal;
3177
3178         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3179                              rx->skb->data, rx->skb->len, 0)) {
3180                 if (rx->sta)
3181                         rx->sta->rx_stats.packets++;
3182                 dev_kfree_skb(rx->skb);
3183                 return RX_QUEUED;
3184         }
3185
3186         return RX_CONTINUE;
3187 }
3188
3189 static ieee80211_rx_result debug_noinline
3190 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3191 {
3192         struct ieee80211_local *local = rx->local;
3193         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3194         struct sk_buff *nskb;
3195         struct ieee80211_sub_if_data *sdata = rx->sdata;
3196         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3197
3198         if (!ieee80211_is_action(mgmt->frame_control))
3199                 return RX_CONTINUE;
3200
3201         /*
3202          * For AP mode, hostapd is responsible for handling any action
3203          * frames that we didn't handle, including returning unknown
3204          * ones. For all other modes we will return them to the sender,
3205          * setting the 0x80 bit in the action category, as required by
3206          * 802.11-2012 9.24.4.
3207          * Newer versions of hostapd shall also use the management frame
3208          * registration mechanisms, but older ones still use cooked
3209          * monitor interfaces so push all frames there.
3210          */
3211         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3212             (sdata->vif.type == NL80211_IFTYPE_AP ||
3213              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3214                 return RX_DROP_MONITOR;
3215
3216         if (is_multicast_ether_addr(mgmt->da))
3217                 return RX_DROP_MONITOR;
3218
3219         /* do not return rejected action frames */
3220         if (mgmt->u.action.category & 0x80)
3221                 return RX_DROP_UNUSABLE;
3222
3223         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3224                                GFP_ATOMIC);
3225         if (nskb) {
3226                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3227
3228                 nmgmt->u.action.category |= 0x80;
3229                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3230                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3231
3232                 memset(nskb->cb, 0, sizeof(nskb->cb));
3233
3234                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3235                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3236
3237                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3238                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3239                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3240                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3241                                 info->hw_queue =
3242                                         local->hw.offchannel_tx_hw_queue;
3243                 }
3244
3245                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3246                                             status->band);
3247         }
3248         dev_kfree_skb(rx->skb);
3249         return RX_QUEUED;
3250 }
3251
3252 static ieee80211_rx_result debug_noinline
3253 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3254 {
3255         struct ieee80211_sub_if_data *sdata = rx->sdata;
3256         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3257         __le16 stype;
3258
3259         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3260
3261         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3262             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3263             sdata->vif.type != NL80211_IFTYPE_OCB &&
3264             sdata->vif.type != NL80211_IFTYPE_STATION)
3265                 return RX_DROP_MONITOR;
3266
3267         switch (stype) {
3268         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3269         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3270         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3271                 /* process for all: mesh, mlme, ibss */
3272                 break;
3273         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3274         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3275         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3276         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3277                 if (is_multicast_ether_addr(mgmt->da) &&
3278                     !is_broadcast_ether_addr(mgmt->da))
3279                         return RX_DROP_MONITOR;
3280
3281                 /* process only for station */
3282                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3283                         return RX_DROP_MONITOR;
3284                 break;
3285         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3286                 /* process only for ibss and mesh */
3287                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3288                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3289                         return RX_DROP_MONITOR;
3290                 break;
3291         default:
3292                 return RX_DROP_MONITOR;
3293         }
3294
3295         /* queue up frame and kick off work to process it */
3296         skb_queue_tail(&sdata->skb_queue, rx->skb);
3297         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3298         if (rx->sta)
3299                 rx->sta->rx_stats.packets++;
3300
3301         return RX_QUEUED;
3302 }
3303
3304 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3305                                         struct ieee80211_rate *rate)
3306 {
3307         struct ieee80211_sub_if_data *sdata;
3308         struct ieee80211_local *local = rx->local;
3309         struct sk_buff *skb = rx->skb, *skb2;
3310         struct net_device *prev_dev = NULL;
3311         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3312         int needed_headroom;
3313
3314         /*
3315          * If cooked monitor has been processed already, then
3316          * don't do it again. If not, set the flag.
3317          */
3318         if (rx->flags & IEEE80211_RX_CMNTR)
3319                 goto out_free_skb;
3320         rx->flags |= IEEE80211_RX_CMNTR;
3321
3322         /* If there are no cooked monitor interfaces, just free the SKB */
3323         if (!local->cooked_mntrs)
3324                 goto out_free_skb;
3325
3326         /* vendor data is long removed here */
3327         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3328         /* room for the radiotap header based on driver features */
3329         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3330
3331         if (skb_headroom(skb) < needed_headroom &&
3332             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3333                 goto out_free_skb;
3334
3335         /* prepend radiotap information */
3336         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3337                                          false);
3338
3339         skb_reset_mac_header(skb);
3340         skb->ip_summed = CHECKSUM_UNNECESSARY;
3341         skb->pkt_type = PACKET_OTHERHOST;
3342         skb->protocol = htons(ETH_P_802_2);
3343
3344         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3345                 if (!ieee80211_sdata_running(sdata))
3346                         continue;
3347
3348                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3349                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3350                         continue;
3351
3352                 if (prev_dev) {
3353                         skb2 = skb_clone(skb, GFP_ATOMIC);
3354                         if (skb2) {
3355                                 skb2->dev = prev_dev;
3356                                 netif_receive_skb(skb2);
3357                         }
3358                 }
3359
3360                 prev_dev = sdata->dev;
3361                 ieee80211_rx_stats(sdata->dev, skb->len);
3362         }
3363
3364         if (prev_dev) {
3365                 skb->dev = prev_dev;
3366                 netif_receive_skb(skb);
3367                 return;
3368         }
3369
3370  out_free_skb:
3371         dev_kfree_skb(skb);
3372 }
3373
3374 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3375                                          ieee80211_rx_result res)
3376 {
3377         switch (res) {
3378         case RX_DROP_MONITOR:
3379                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3380                 if (rx->sta)
3381                         rx->sta->rx_stats.dropped++;
3382                 /* fall through */
3383         case RX_CONTINUE: {
3384                 struct ieee80211_rate *rate = NULL;
3385                 struct ieee80211_supported_band *sband;
3386                 struct ieee80211_rx_status *status;
3387
3388                 status = IEEE80211_SKB_RXCB((rx->skb));
3389
3390                 sband = rx->local->hw.wiphy->bands[status->band];
3391                 if (!(status->encoding == RX_ENC_HT) &&
3392                     !(status->encoding == RX_ENC_VHT))
3393                         rate = &sband->bitrates[status->rate_idx];
3394
3395                 ieee80211_rx_cooked_monitor(rx, rate);
3396                 break;
3397                 }
3398         case RX_DROP_UNUSABLE:
3399                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3400                 if (rx->sta)
3401                         rx->sta->rx_stats.dropped++;
3402                 dev_kfree_skb(rx->skb);
3403                 break;
3404         case RX_QUEUED:
3405                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3406                 break;
3407         }
3408 }
3409
3410 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3411                                   struct sk_buff_head *frames)
3412 {
3413         ieee80211_rx_result res = RX_DROP_MONITOR;
3414         struct sk_buff *skb;
3415
3416 #define CALL_RXH(rxh)                   \
3417         do {                            \
3418                 res = rxh(rx);          \
3419                 if (res != RX_CONTINUE) \
3420                         goto rxh_next;  \
3421         } while (0)
3422
3423         /* Lock here to avoid hitting all of the data used in the RX
3424          * path (e.g. key data, station data, ...) concurrently when
3425          * a frame is released from the reorder buffer due to timeout
3426          * from the timer, potentially concurrently with RX from the
3427          * driver.
3428          */
3429         spin_lock_bh(&rx->local->rx_path_lock);
3430
3431         while ((skb = __skb_dequeue(frames))) {
3432                 /*
3433                  * all the other fields are valid across frames
3434                  * that belong to an aMPDU since they are on the
3435                  * same TID from the same station
3436                  */
3437                 rx->skb = skb;
3438
3439                 CALL_RXH(ieee80211_rx_h_check_more_data);
3440                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3441                 CALL_RXH(ieee80211_rx_h_sta_process);
3442                 CALL_RXH(ieee80211_rx_h_decrypt);
3443                 CALL_RXH(ieee80211_rx_h_defragment);
3444                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3445                 /* must be after MMIC verify so header is counted in MPDU mic */
3446 #ifdef CONFIG_MAC80211_MESH
3447                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3448                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3449 #endif
3450                 CALL_RXH(ieee80211_rx_h_amsdu);
3451                 CALL_RXH(ieee80211_rx_h_data);
3452
3453                 /* special treatment -- needs the queue */
3454                 res = ieee80211_rx_h_ctrl(rx, frames);
3455                 if (res != RX_CONTINUE)
3456                         goto rxh_next;
3457
3458                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3459                 CALL_RXH(ieee80211_rx_h_action);
3460                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3461                 CALL_RXH(ieee80211_rx_h_action_return);
3462                 CALL_RXH(ieee80211_rx_h_mgmt);
3463
3464  rxh_next:
3465                 ieee80211_rx_handlers_result(rx, res);
3466
3467 #undef CALL_RXH
3468         }
3469
3470         spin_unlock_bh(&rx->local->rx_path_lock);
3471 }
3472
3473 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3474 {
3475         struct sk_buff_head reorder_release;
3476         ieee80211_rx_result res = RX_DROP_MONITOR;
3477
3478         __skb_queue_head_init(&reorder_release);
3479
3480 #define CALL_RXH(rxh)                   \
3481         do {                            \
3482                 res = rxh(rx);          \
3483                 if (res != RX_CONTINUE) \
3484                         goto rxh_next;  \
3485         } while (0)
3486
3487         CALL_RXH(ieee80211_rx_h_check_dup);
3488         CALL_RXH(ieee80211_rx_h_check);
3489
3490         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3491
3492         ieee80211_rx_handlers(rx, &reorder_release);
3493         return;
3494
3495  rxh_next:
3496         ieee80211_rx_handlers_result(rx, res);
3497
3498 #undef CALL_RXH
3499 }
3500
3501 /*
3502  * This function makes calls into the RX path, therefore
3503  * it has to be invoked under RCU read lock.
3504  */
3505 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3506 {
3507         struct sk_buff_head frames;
3508         struct ieee80211_rx_data rx = {
3509                 .sta = sta,
3510                 .sdata = sta->sdata,
3511                 .local = sta->local,
3512                 /* This is OK -- must be QoS data frame */
3513                 .security_idx = tid,
3514                 .seqno_idx = tid,
3515                 .napi = NULL, /* must be NULL to not have races */
3516         };
3517         struct tid_ampdu_rx *tid_agg_rx;
3518
3519         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3520         if (!tid_agg_rx)
3521                 return;
3522
3523         __skb_queue_head_init(&frames);
3524
3525         spin_lock(&tid_agg_rx->reorder_lock);
3526         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3527         spin_unlock(&tid_agg_rx->reorder_lock);
3528
3529         if (!skb_queue_empty(&frames)) {
3530                 struct ieee80211_event event = {
3531                         .type = BA_FRAME_TIMEOUT,
3532                         .u.ba.tid = tid,
3533                         .u.ba.sta = &sta->sta,
3534                 };
3535                 drv_event_callback(rx.local, rx.sdata, &event);
3536         }
3537
3538         ieee80211_rx_handlers(&rx, &frames);
3539 }
3540
3541 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3542                                           u16 ssn, u64 filtered,
3543                                           u16 received_mpdus)
3544 {
3545         struct sta_info *sta;
3546         struct tid_ampdu_rx *tid_agg_rx;
3547         struct sk_buff_head frames;
3548         struct ieee80211_rx_data rx = {
3549                 /* This is OK -- must be QoS data frame */
3550                 .security_idx = tid,
3551                 .seqno_idx = tid,
3552         };
3553         int i, diff;
3554
3555         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3556                 return;
3557
3558         __skb_queue_head_init(&frames);
3559
3560         sta = container_of(pubsta, struct sta_info, sta);
3561
3562         rx.sta = sta;
3563         rx.sdata = sta->sdata;
3564         rx.local = sta->local;
3565
3566         rcu_read_lock();
3567         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3568         if (!tid_agg_rx)
3569                 goto out;
3570
3571         spin_lock_bh(&tid_agg_rx->reorder_lock);
3572
3573         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3574                 int release;
3575
3576                 /* release all frames in the reorder buffer */
3577                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3578                            IEEE80211_SN_MODULO;
3579                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3580                                                  release, &frames);
3581                 /* update ssn to match received ssn */
3582                 tid_agg_rx->head_seq_num = ssn;
3583         } else {
3584                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3585                                                  &frames);
3586         }
3587
3588         /* handle the case that received ssn is behind the mac ssn.
3589          * it can be tid_agg_rx->buf_size behind and still be valid */
3590         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3591         if (diff >= tid_agg_rx->buf_size) {
3592                 tid_agg_rx->reorder_buf_filtered = 0;
3593                 goto release;
3594         }
3595         filtered = filtered >> diff;
3596         ssn += diff;
3597
3598         /* update bitmap */
3599         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3600                 int index = (ssn + i) % tid_agg_rx->buf_size;
3601
3602                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3603                 if (filtered & BIT_ULL(i))
3604                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3605         }
3606
3607         /* now process also frames that the filter marking released */
3608         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3609
3610 release:
3611         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3612
3613         ieee80211_rx_handlers(&rx, &frames);
3614
3615  out:
3616         rcu_read_unlock();
3617 }
3618 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3619
3620 /* main receive path */
3621
3622 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3623 {
3624         struct ieee80211_sub_if_data *sdata = rx->sdata;
3625         struct sk_buff *skb = rx->skb;
3626         struct ieee80211_hdr *hdr = (void *)skb->data;
3627         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3628         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3629         bool multicast = is_multicast_ether_addr(hdr->addr1);
3630
3631         switch (sdata->vif.type) {
3632         case NL80211_IFTYPE_STATION:
3633                 if (!bssid && !sdata->u.mgd.use_4addr)
3634                         return false;
3635                 if (multicast)
3636                         return true;
3637                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3638         case NL80211_IFTYPE_ADHOC:
3639                 if (!bssid)
3640                         return false;
3641                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3642                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3643                         return false;
3644                 if (ieee80211_is_beacon(hdr->frame_control))
3645                         return true;
3646                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3647                         return false;
3648                 if (!multicast &&
3649                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3650                         return false;
3651                 if (!rx->sta) {
3652                         int rate_idx;
3653                         if (status->encoding != RX_ENC_LEGACY)
3654                                 rate_idx = 0; /* TODO: HT/VHT rates */
3655                         else
3656                                 rate_idx = status->rate_idx;
3657                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3658                                                  BIT(rate_idx));
3659                 }
3660                 return true;
3661         case NL80211_IFTYPE_OCB:
3662                 if (!bssid)
3663                         return false;
3664                 if (!ieee80211_is_data_present(hdr->frame_control))
3665                         return false;
3666                 if (!is_broadcast_ether_addr(bssid))
3667                         return false;
3668                 if (!multicast &&
3669                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3670                         return false;
3671                 if (!rx->sta) {
3672                         int rate_idx;
3673                         if (status->encoding != RX_ENC_LEGACY)
3674                                 rate_idx = 0; /* TODO: HT rates */
3675                         else
3676                                 rate_idx = status->rate_idx;
3677                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3678                                                 BIT(rate_idx));
3679                 }
3680                 return true;
3681         case NL80211_IFTYPE_MESH_POINT:
3682                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3683                         return false;
3684                 if (multicast)
3685                         return true;
3686                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3687         case NL80211_IFTYPE_AP_VLAN:
3688         case NL80211_IFTYPE_AP:
3689                 if (!bssid)
3690                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3691
3692                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3693                         /*
3694                          * Accept public action frames even when the
3695                          * BSSID doesn't match, this is used for P2P
3696                          * and location updates. Note that mac80211
3697                          * itself never looks at these frames.
3698                          */
3699                         if (!multicast &&
3700                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3701                                 return false;
3702                         if (ieee80211_is_public_action(hdr, skb->len))
3703                                 return true;
3704                         return ieee80211_is_beacon(hdr->frame_control);
3705                 }
3706
3707                 if (!ieee80211_has_tods(hdr->frame_control)) {
3708                         /* ignore data frames to TDLS-peers */
3709                         if (ieee80211_is_data(hdr->frame_control))
3710                                 return false;
3711                         /* ignore action frames to TDLS-peers */
3712                         if (ieee80211_is_action(hdr->frame_control) &&
3713                             !is_broadcast_ether_addr(bssid) &&
3714                             !ether_addr_equal(bssid, hdr->addr1))
3715                                 return false;
3716                 }
3717
3718                 /*
3719                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3720                  * the BSSID - we've checked that already but may have accepted
3721                  * the wildcard (ff:ff:ff:ff:ff:ff).
3722                  *
3723                  * It also says:
3724                  *      The BSSID of the Data frame is determined as follows:
3725                  *      a) If the STA is contained within an AP or is associated
3726                  *         with an AP, the BSSID is the address currently in use
3727                  *         by the STA contained in the AP.
3728                  *
3729                  * So we should not accept data frames with an address that's
3730                  * multicast.
3731                  *
3732                  * Accepting it also opens a security problem because stations
3733                  * could encrypt it with the GTK and inject traffic that way.
3734                  */
3735                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3736                         return false;
3737
3738                 return true;
3739         case NL80211_IFTYPE_WDS:
3740                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3741                         return false;
3742                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3743         case NL80211_IFTYPE_P2P_DEVICE:
3744                 return ieee80211_is_public_action(hdr, skb->len) ||
3745                        ieee80211_is_probe_req(hdr->frame_control) ||
3746                        ieee80211_is_probe_resp(hdr->frame_control) ||
3747                        ieee80211_is_beacon(hdr->frame_control);
3748         case NL80211_IFTYPE_NAN:
3749                 /* Currently no frames on NAN interface are allowed */
3750                 return false;
3751         default:
3752                 break;
3753         }
3754
3755         WARN_ON_ONCE(1);
3756         return false;
3757 }
3758
3759 void ieee80211_check_fast_rx(struct sta_info *sta)
3760 {
3761         struct ieee80211_sub_if_data *sdata = sta->sdata;
3762         struct ieee80211_local *local = sdata->local;
3763         struct ieee80211_key *key;
3764         struct ieee80211_fast_rx fastrx = {
3765                 .dev = sdata->dev,
3766                 .vif_type = sdata->vif.type,
3767                 .control_port_protocol = sdata->control_port_protocol,
3768         }, *old, *new = NULL;
3769         bool assign = false;
3770
3771         /* use sparse to check that we don't return without updating */
3772         __acquire(check_fast_rx);
3773
3774         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3775         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3776         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3777         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3778
3779         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3780
3781         /* fast-rx doesn't do reordering */
3782         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3783             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3784                 goto clear;
3785
3786         switch (sdata->vif.type) {
3787         case NL80211_IFTYPE_STATION:
3788                 if (sta->sta.tdls) {
3789                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3790                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3791                         fastrx.expected_ds_bits = 0;
3792                 } else {
3793                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3794                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3795                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3796                         fastrx.expected_ds_bits =
3797                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3798                 }
3799
3800                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3801                         fastrx.expected_ds_bits |=
3802                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3803                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3804                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3805                 }
3806
3807                 if (!sdata->u.mgd.powersave)
3808                         break;
3809
3810                 /* software powersave is a huge mess, avoid all of it */
3811                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3812                         goto clear;
3813                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3814                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3815                         goto clear;
3816                 break;
3817         case NL80211_IFTYPE_AP_VLAN:
3818         case NL80211_IFTYPE_AP:
3819                 /* parallel-rx requires this, at least with calls to
3820                  * ieee80211_sta_ps_transition()
3821                  */
3822                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3823                         goto clear;
3824                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3825                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3826                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3827
3828                 fastrx.internal_forward =
3829                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3830                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3831                          !sdata->u.vlan.sta);
3832
3833                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3834                     sdata->u.vlan.sta) {
3835                         fastrx.expected_ds_bits |=
3836                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3837                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3838                         fastrx.internal_forward = 0;
3839                 }
3840
3841                 break;
3842         default:
3843                 goto clear;
3844         }
3845
3846         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3847                 goto clear;
3848
3849         rcu_read_lock();
3850         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3851         if (key) {
3852                 switch (key->conf.cipher) {
3853                 case WLAN_CIPHER_SUITE_TKIP:
3854                         /* we don't want to deal with MMIC in fast-rx */
3855                         goto clear_rcu;
3856                 case WLAN_CIPHER_SUITE_CCMP:
3857                 case WLAN_CIPHER_SUITE_CCMP_256:
3858                 case WLAN_CIPHER_SUITE_GCMP:
3859                 case WLAN_CIPHER_SUITE_GCMP_256:
3860                         break;
3861                 default:
3862                         /* we also don't want to deal with WEP or cipher scheme
3863                          * since those require looking up the key idx in the
3864                          * frame, rather than assuming the PTK is used
3865                          * (we need to revisit this once we implement the real
3866                          * PTK index, which is now valid in the spec, but we
3867                          * haven't implemented that part yet)
3868                          */
3869                         goto clear_rcu;
3870                 }
3871
3872                 fastrx.key = true;
3873                 fastrx.icv_len = key->conf.icv_len;
3874         }
3875
3876         assign = true;
3877  clear_rcu:
3878         rcu_read_unlock();
3879  clear:
3880         __release(check_fast_rx);
3881
3882         if (assign)
3883                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3884
3885         spin_lock_bh(&sta->lock);
3886         old = rcu_dereference_protected(sta->fast_rx, true);
3887         rcu_assign_pointer(sta->fast_rx, new);
3888         spin_unlock_bh(&sta->lock);
3889
3890         if (old)
3891                 kfree_rcu(old, rcu_head);
3892 }
3893
3894 void ieee80211_clear_fast_rx(struct sta_info *sta)
3895 {
3896         struct ieee80211_fast_rx *old;
3897
3898         spin_lock_bh(&sta->lock);
3899         old = rcu_dereference_protected(sta->fast_rx, true);
3900         RCU_INIT_POINTER(sta->fast_rx, NULL);
3901         spin_unlock_bh(&sta->lock);
3902
3903         if (old)
3904                 kfree_rcu(old, rcu_head);
3905 }
3906
3907 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3908 {
3909         struct ieee80211_local *local = sdata->local;
3910         struct sta_info *sta;
3911
3912         lockdep_assert_held(&local->sta_mtx);
3913
3914         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3915                 if (sdata != sta->sdata &&
3916                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3917                         continue;
3918                 ieee80211_check_fast_rx(sta);
3919         }
3920 }
3921
3922 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3923 {
3924         struct ieee80211_local *local = sdata->local;
3925
3926         mutex_lock(&local->sta_mtx);
3927         __ieee80211_check_fast_rx_iface(sdata);
3928         mutex_unlock(&local->sta_mtx);
3929 }
3930
3931 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3932                                      struct ieee80211_fast_rx *fast_rx)
3933 {
3934         struct sk_buff *skb = rx->skb;
3935         struct ieee80211_hdr *hdr = (void *)skb->data;
3936         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3937         struct sta_info *sta = rx->sta;
3938         int orig_len = skb->len;
3939         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3940         int snap_offs = hdrlen;
3941         struct {
3942                 u8 snap[sizeof(rfc1042_header)];
3943                 __be16 proto;
3944         } *payload __aligned(2);
3945         struct {
3946                 u8 da[ETH_ALEN];
3947                 u8 sa[ETH_ALEN];
3948         } addrs __aligned(2);
3949         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3950
3951         if (fast_rx->uses_rss)
3952                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3953
3954         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3955          * to a common data structure; drivers can implement that per queue
3956          * but we don't have that information in mac80211
3957          */
3958         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3959                 return false;
3960
3961 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3962
3963         /* If using encryption, we also need to have:
3964          *  - PN_VALIDATED: similar, but the implementation is tricky
3965          *  - DECRYPTED: necessary for PN_VALIDATED
3966          */
3967         if (fast_rx->key &&
3968             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3969                 return false;
3970
3971         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3972                 return false;
3973
3974         if (unlikely(ieee80211_is_frag(hdr)))
3975                 return false;
3976
3977         /* Since our interface address cannot be multicast, this
3978          * implicitly also rejects multicast frames without the
3979          * explicit check.
3980          *
3981          * We shouldn't get any *data* frames not addressed to us
3982          * (AP mode will accept multicast *management* frames), but
3983          * punting here will make it go through the full checks in
3984          * ieee80211_accept_frame().
3985          */
3986         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3987                 return false;
3988
3989         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3990                                               IEEE80211_FCTL_TODS)) !=
3991             fast_rx->expected_ds_bits)
3992                 return false;
3993
3994         /* assign the key to drop unencrypted frames (later)
3995          * and strip the IV/MIC if necessary
3996          */
3997         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3998                 /* GCMP header length is the same */
3999                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4000         }
4001
4002         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4003                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4004                         goto drop;
4005
4006                 payload = (void *)(skb->data + snap_offs);
4007
4008                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4009                         return false;
4010
4011                 /* Don't handle these here since they require special code.
4012                  * Accept AARP and IPX even though they should come with a
4013                  * bridge-tunnel header - but if we get them this way then
4014                  * there's little point in discarding them.
4015                  */
4016                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4017                              payload->proto == fast_rx->control_port_protocol))
4018                         return false;
4019         }
4020
4021         /* after this point, don't punt to the slowpath! */
4022
4023         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4024             pskb_trim(skb, skb->len - fast_rx->icv_len))
4025                 goto drop;
4026
4027         if (unlikely(fast_rx->sta_notify)) {
4028                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4029                 fast_rx->sta_notify = false;
4030         }
4031
4032         /* statistics part of ieee80211_rx_h_sta_process() */
4033         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4034                 stats->last_signal = status->signal;
4035                 if (!fast_rx->uses_rss)
4036                         ewma_signal_add(&sta->rx_stats_avg.signal,
4037                                         -status->signal);
4038         }
4039
4040         if (status->chains) {
4041                 int i;
4042
4043                 stats->chains = status->chains;
4044                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4045                         int signal = status->chain_signal[i];
4046
4047                         if (!(status->chains & BIT(i)))
4048                                 continue;
4049
4050                         stats->chain_signal_last[i] = signal;
4051                         if (!fast_rx->uses_rss)
4052                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4053                                                 -signal);
4054                 }
4055         }
4056         /* end of statistics */
4057
4058         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4059                 goto drop;
4060
4061         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4062                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4063                     RX_QUEUED)
4064                         goto drop;
4065
4066                 return true;
4067         }
4068
4069         stats->last_rx = jiffies;
4070         stats->last_rate = sta_stats_encode_rate(status);
4071
4072         stats->fragments++;
4073         stats->packets++;
4074
4075         /* do the header conversion - first grab the addresses */
4076         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4077         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4078         /* remove the SNAP but leave the ethertype */
4079         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4080         /* push the addresses in front */
4081         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4082
4083         skb->dev = fast_rx->dev;
4084
4085         ieee80211_rx_stats(fast_rx->dev, skb->len);
4086
4087         /* The seqno index has the same property as needed
4088          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4089          * for non-QoS-data frames. Here we know it's a data
4090          * frame, so count MSDUs.
4091          */
4092         u64_stats_update_begin(&stats->syncp);
4093         stats->msdu[rx->seqno_idx]++;
4094         stats->bytes += orig_len;
4095         u64_stats_update_end(&stats->syncp);
4096
4097         if (fast_rx->internal_forward) {
4098                 struct sk_buff *xmit_skb = NULL;
4099                 bool multicast = is_multicast_ether_addr(skb->data);
4100
4101                 if (multicast) {
4102                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4103                 } else if (sta_info_get(rx->sdata, skb->data)) {
4104                         xmit_skb = skb;
4105                         skb = NULL;
4106                 }
4107
4108                 if (xmit_skb) {
4109                         /*
4110                          * Send to wireless media and increase priority by 256
4111                          * to keep the received priority instead of
4112                          * reclassifying the frame (see cfg80211_classify8021d).
4113                          */
4114                         xmit_skb->priority += 256;
4115                         xmit_skb->protocol = htons(ETH_P_802_3);
4116                         skb_reset_network_header(xmit_skb);
4117                         skb_reset_mac_header(xmit_skb);
4118                         dev_queue_xmit(xmit_skb);
4119                 }
4120
4121                 if (!skb)
4122                         return true;
4123         }
4124
4125         /* deliver to local stack */
4126         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4127         memset(skb->cb, 0, sizeof(skb->cb));
4128         if (rx->napi)
4129                 napi_gro_receive(rx->napi, skb);
4130         else
4131                 netif_receive_skb(skb);
4132
4133         return true;
4134  drop:
4135         dev_kfree_skb(skb);
4136         stats->dropped++;
4137         return true;
4138 }
4139
4140 /*
4141  * This function returns whether or not the SKB
4142  * was destined for RX processing or not, which,
4143  * if consume is true, is equivalent to whether
4144  * or not the skb was consumed.
4145  */
4146 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4147                                             struct sk_buff *skb, bool consume)
4148 {
4149         struct ieee80211_local *local = rx->local;
4150         struct ieee80211_sub_if_data *sdata = rx->sdata;
4151
4152         rx->skb = skb;
4153
4154         /* See if we can do fast-rx; if we have to copy we already lost,
4155          * so punt in that case. We should never have to deliver a data
4156          * frame to multiple interfaces anyway.
4157          *
4158          * We skip the ieee80211_accept_frame() call and do the necessary
4159          * checking inside ieee80211_invoke_fast_rx().
4160          */
4161         if (consume && rx->sta) {
4162                 struct ieee80211_fast_rx *fast_rx;
4163
4164                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4165                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4166                         return true;
4167         }
4168
4169         if (!ieee80211_accept_frame(rx))
4170                 return false;
4171
4172         if (!consume) {
4173                 skb = skb_copy(skb, GFP_ATOMIC);
4174                 if (!skb) {
4175                         if (net_ratelimit())
4176                                 wiphy_debug(local->hw.wiphy,
4177                                         "failed to copy skb for %s\n",
4178                                         sdata->name);
4179                         return true;
4180                 }
4181
4182                 rx->skb = skb;
4183         }
4184
4185         ieee80211_invoke_rx_handlers(rx);
4186         return true;
4187 }
4188
4189 /*
4190  * This is the actual Rx frames handler. as it belongs to Rx path it must
4191  * be called with rcu_read_lock protection.
4192  */
4193 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4194                                          struct ieee80211_sta *pubsta,
4195                                          struct sk_buff *skb,
4196                                          struct napi_struct *napi)
4197 {
4198         struct ieee80211_local *local = hw_to_local(hw);
4199         struct ieee80211_sub_if_data *sdata;
4200         struct ieee80211_hdr *hdr;
4201         __le16 fc;
4202         struct ieee80211_rx_data rx;
4203         struct ieee80211_sub_if_data *prev;
4204         struct rhlist_head *tmp;
4205         int err = 0;
4206
4207         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4208         memset(&rx, 0, sizeof(rx));
4209         rx.skb = skb;
4210         rx.local = local;
4211         rx.napi = napi;
4212
4213         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4214                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4215
4216         if (ieee80211_is_mgmt(fc)) {
4217                 /* drop frame if too short for header */
4218                 if (skb->len < ieee80211_hdrlen(fc))
4219                         err = -ENOBUFS;
4220                 else
4221                         err = skb_linearize(skb);
4222         } else {
4223                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4224         }
4225
4226         if (err) {
4227                 dev_kfree_skb(skb);
4228                 return;
4229         }
4230
4231         hdr = (struct ieee80211_hdr *)skb->data;
4232         ieee80211_parse_qos(&rx);
4233         ieee80211_verify_alignment(&rx);
4234
4235         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4236                      ieee80211_is_beacon(hdr->frame_control)))
4237                 ieee80211_scan_rx(local, skb);
4238
4239         if (ieee80211_is_data(fc)) {
4240                 struct sta_info *sta, *prev_sta;
4241
4242                 if (pubsta) {
4243                         rx.sta = container_of(pubsta, struct sta_info, sta);
4244                         rx.sdata = rx.sta->sdata;
4245                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4246                                 return;
4247                         goto out;
4248                 }
4249
4250                 prev_sta = NULL;
4251
4252                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4253                         if (!prev_sta) {
4254                                 prev_sta = sta;
4255                                 continue;
4256                         }
4257
4258                         rx.sta = prev_sta;
4259                         rx.sdata = prev_sta->sdata;
4260                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4261
4262                         prev_sta = sta;
4263                 }
4264
4265                 if (prev_sta) {
4266                         rx.sta = prev_sta;
4267                         rx.sdata = prev_sta->sdata;
4268
4269                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4270                                 return;
4271                         goto out;
4272                 }
4273         }
4274
4275         prev = NULL;
4276
4277         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4278                 if (!ieee80211_sdata_running(sdata))
4279                         continue;
4280
4281                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4282                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4283                         continue;
4284
4285                 /*
4286                  * frame is destined for this interface, but if it's
4287                  * not also for the previous one we handle that after
4288                  * the loop to avoid copying the SKB once too much
4289                  */
4290
4291                 if (!prev) {
4292                         prev = sdata;
4293                         continue;
4294                 }
4295
4296                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4297                 rx.sdata = prev;
4298                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4299
4300                 prev = sdata;
4301         }
4302
4303         if (prev) {
4304                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4305                 rx.sdata = prev;
4306
4307                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4308                         return;
4309         }
4310
4311  out:
4312         dev_kfree_skb(skb);
4313 }
4314
4315 /*
4316  * This is the receive path handler. It is called by a low level driver when an
4317  * 802.11 MPDU is received from the hardware.
4318  */
4319 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4320                        struct sk_buff *skb, struct napi_struct *napi)
4321 {
4322         struct ieee80211_local *local = hw_to_local(hw);
4323         struct ieee80211_rate *rate = NULL;
4324         struct ieee80211_supported_band *sband;
4325         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4326
4327         WARN_ON_ONCE(softirq_count() == 0);
4328
4329         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4330                 goto drop;
4331
4332         sband = local->hw.wiphy->bands[status->band];
4333         if (WARN_ON(!sband))
4334                 goto drop;
4335
4336         /*
4337          * If we're suspending, it is possible although not too likely
4338          * that we'd be receiving frames after having already partially
4339          * quiesced the stack. We can't process such frames then since
4340          * that might, for example, cause stations to be added or other
4341          * driver callbacks be invoked.
4342          */
4343         if (unlikely(local->quiescing || local->suspended))
4344                 goto drop;
4345
4346         /* We might be during a HW reconfig, prevent Rx for the same reason */
4347         if (unlikely(local->in_reconfig))
4348                 goto drop;
4349
4350         /*
4351          * The same happens when we're not even started,
4352          * but that's worth a warning.
4353          */
4354         if (WARN_ON(!local->started))
4355                 goto drop;
4356
4357         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4358                 /*
4359                  * Validate the rate, unless a PLCP error means that
4360                  * we probably can't have a valid rate here anyway.
4361                  */
4362
4363                 switch (status->encoding) {
4364                 case RX_ENC_HT:
4365                         /*
4366                          * rate_idx is MCS index, which can be [0-76]
4367                          * as documented on:
4368                          *
4369                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4370                          *
4371                          * Anything else would be some sort of driver or
4372                          * hardware error. The driver should catch hardware
4373                          * errors.
4374                          */
4375                         if (WARN(status->rate_idx > 76,
4376                                  "Rate marked as an HT rate but passed "
4377                                  "status->rate_idx is not "
4378                                  "an MCS index [0-76]: %d (0x%02x)\n",
4379                                  status->rate_idx,
4380                                  status->rate_idx))
4381                                 goto drop;
4382                         break;
4383                 case RX_ENC_VHT:
4384                         if (WARN_ONCE(status->rate_idx > 9 ||
4385                                       !status->nss ||
4386                                       status->nss > 8,
4387                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4388                                       status->rate_idx, status->nss))
4389                                 goto drop;
4390                         break;
4391                 default:
4392                         WARN_ON_ONCE(1);
4393                         /* fall through */
4394                 case RX_ENC_LEGACY:
4395                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4396                                 goto drop;
4397                         rate = &sband->bitrates[status->rate_idx];
4398                 }
4399         }
4400
4401         status->rx_flags = 0;
4402
4403         /*
4404          * key references and virtual interfaces are protected using RCU
4405          * and this requires that we are in a read-side RCU section during
4406          * receive processing
4407          */
4408         rcu_read_lock();
4409
4410         /*
4411          * Frames with failed FCS/PLCP checksum are not returned,
4412          * all other frames are returned without radiotap header
4413          * if it was previously present.
4414          * Also, frames with less than 16 bytes are dropped.
4415          */
4416         skb = ieee80211_rx_monitor(local, skb, rate);
4417         if (!skb) {
4418                 rcu_read_unlock();
4419                 return;
4420         }
4421
4422         ieee80211_tpt_led_trig_rx(local,
4423                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4424                         skb->len);
4425
4426         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4427
4428         rcu_read_unlock();
4429
4430         return;
4431  drop:
4432         kfree_skb(skb);
4433 }
4434 EXPORT_SYMBOL(ieee80211_rx_napi);
4435
4436 /* This is a version of the rx handler that can be called from hard irq
4437  * context. Post the skb on the queue and schedule the tasklet */
4438 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4439 {
4440         struct ieee80211_local *local = hw_to_local(hw);
4441
4442         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4443
4444         skb->pkt_type = IEEE80211_RX_MSG;
4445         skb_queue_tail(&local->skb_queue, skb);
4446         tasklet_schedule(&local->tasklet);
4447 }
4448 EXPORT_SYMBOL(ieee80211_rx_irqsafe);