net/mac80211/rx.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   8  * Copyright (C) 2018 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/jiffies.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/export.h>
  23 #include <linux/bitops.h>
  24 #include <net/mac80211.h>
  25 #include <net/ieee80211_radiotap.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "led.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "rate.h"
  37
  38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
  39 {
  40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
  41
  42         u64_stats_update_begin(&tstats->syncp);
  43         tstats->rx_packets++;
  44         tstats->rx_bytes += len;
  45         u64_stats_update_end(&tstats->syncp);
  46 }
  47
  48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                                enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53         if (ieee80211_is_data(fc)) {
  54                 if (len < 24) /* drop incorrect hdr len (data) */
  55                         return NULL;
  56
  57                 if (ieee80211_has_a4(fc))
  58                         return NULL;
  59                 if (ieee80211_has_tods(fc))
  60                         return hdr->addr1;
  61                 if (ieee80211_has_fromds(fc))
  62                         return hdr->addr2;
  63
  64                 return hdr->addr3;
  65         }
  66
  67         if (ieee80211_is_mgmt(fc)) {
  68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  69                         return NULL;
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_ctl(fc)) {
  74                 if (ieee80211_is_pspoll(fc))
  75                         return hdr->addr1;
  76
  77                 if (ieee80211_is_back_req(fc)) {
  78                         switch (type) {
  79                         case NL80211_IFTYPE_STATION:
  80                                 return hdr->addr2;
  81                         case NL80211_IFTYPE_AP:
  82                         case NL80211_IFTYPE_AP_VLAN:
  83                                 return hdr->addr1;
  84                         default:
  85                                 break; /* fall through to the return */
  86                         }
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94  * monitor mode reception
  95  *
  96  * This function cleans up the SKB, i.e. it removes all the stuff
  97  * only useful for monitoring.
  98  */
  99 static void remove_monitor_info(struct sk_buff *skb,
 100                                 unsigned int present_fcs_len,
 101                                 unsigned int rtap_space)
 102 {
 103         if (present_fcs_len)
 104                 __pskb_trim(skb, skb->len - present_fcs_len);
 105         __pskb_pull(skb, rtap_space);
 106 }
 107
 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
 109                                      unsigned int rtap_space)
 110 {
 111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 112         struct ieee80211_hdr *hdr;
 113
 114         hdr = (void *)(skb->data + rtap_space);
 115
 116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 117                             RX_FLAG_FAILED_PLCP_CRC |
 118                             RX_FLAG_ONLY_MONITOR))
 119                 return true;
 120
 121         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 122                 return true;
 123
 124         if (ieee80211_is_ctl(hdr->frame_control) &&
 125             !ieee80211_is_pspoll(hdr->frame_control) &&
 126             !ieee80211_is_back_req(hdr->frame_control))
 127                 return true;
 128
 129         return false;
 130 }
 131
 132 static int
 133 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 134                              struct ieee80211_rx_status *status,
 135                              struct sk_buff *skb)
 136 {
 137         int len;
 138
 139         /* always present fields */
 140         len = sizeof(struct ieee80211_radiotap_header) + 8;
 141
 142         /* allocate extra bitmaps */
 143         if (status->chains)
 144                 len += 4 * hweight8(status->chains);
 145
 146         if (ieee80211_have_rx_timestamp(status)) {
 147                 len = ALIGN(len, 8);
 148                 len += 8;
 149         }
 150         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 151                 len += 1;
 152
 153         /* antenna field, if we don't have per-chain info */
 154         if (!status->chains)
 155                 len += 1;
 156
 157         /* padding for RX_FLAGS if necessary */
 158         len = ALIGN(len, 2);
 159
 160         if (status->encoding == RX_ENC_HT) /* HT info */
 161                 len += 3;
 162
 163         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 164                 len = ALIGN(len, 4);
 165                 len += 8;
 166         }
 167
 168         if (status->encoding == RX_ENC_VHT) {
 169                 len = ALIGN(len, 2);
 170                 len += 12;
 171         }
 172
 173         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 174                 len = ALIGN(len, 8);
 175                 len += 12;
 176         }
 177
 178         if (status->chains) {
 179                 /* antenna and antenna signal fields */
 180                 len += 2 * hweight8(status->chains);
 181         }
 182
 183         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 184                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 185
 186                 /* vendor presence bitmap */
 187                 len += 4;
 188                 /* alignment for fixed 6-byte vendor data header */
 189                 len = ALIGN(len, 2);
 190                 /* vendor data header */
 191                 len += 6;
 192                 if (WARN_ON(rtap->align == 0))
 193                         rtap->align = 1;
 194                 len = ALIGN(len, rtap->align);
 195                 len += rtap->len + rtap->pad;
 196         }
 197
 198         return len;
 199 }
 200
 201 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 202                                          struct sk_buff *skb,
 203                                          int rtap_space)
 204 {
 205         struct {
 206                 struct ieee80211_hdr_3addr hdr;
 207                 u8 category;
 208                 u8 action_code;
 209         } __packed action;
 210
 211         if (!sdata)
 212                 return;
 213
 214         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 215
 216         if (skb->len < rtap_space + sizeof(action) +
 217                        VHT_MUMIMO_GROUPS_DATA_LEN)
 218                 return;
 219
 220         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 221                 return;
 222
 223         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 224
 225         if (!ieee80211_is_action(action.hdr.frame_control))
 226                 return;
 227
 228         if (action.category != WLAN_CATEGORY_VHT)
 229                 return;
 230
 231         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 232                 return;
 233
 234         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 235                 return;
 236
 237         skb = skb_copy(skb, GFP_ATOMIC);
 238         if (!skb)
 239                 return;
 240
 241         skb_queue_tail(&sdata->skb_queue, skb);
 242         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 243 }
 244
 245 /*
 246  * ieee80211_add_rx_radiotap_header - add radiotap header
 247  *
 248  * add a radiotap header containing all the fields which the hardware provided.
 249  */
 250 static void
 251 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 252                                  struct sk_buff *skb,
 253                                  struct ieee80211_rate *rate,
 254                                  int rtap_len, bool has_fcs)
 255 {
 256         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 257         struct ieee80211_radiotap_header *rthdr;
 258         unsigned char *pos;
 259         __le32 *it_present;
 260         u32 it_present_val;
 261         u16 rx_flags = 0;
 262         u16 channel_flags = 0;
 263         int mpdulen, chain;
 264         unsigned long chains = status->chains;
 265         struct ieee80211_vendor_radiotap rtap = {};
 266
 267         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 268                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
 269                 /* rtap.len and rtap.pad are undone immediately */
 270                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
 271         }
 272
 273         mpdulen = skb->len;
 274         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 275                 mpdulen += FCS_LEN;
 276
 277         rthdr = skb_push(skb, rtap_len);
 278         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
 279         it_present = &rthdr->it_present;
 280
 281         /* radiotap header, set always present flags */
 282         rthdr->it_len = cpu_to_le16(rtap_len);
 283         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 284                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 285                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 286
 287         if (!status->chains)
 288                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 289
 290         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 291                 it_present_val |=
 292                         BIT(IEEE80211_RADIOTAP_EXT) |
 293                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 294                 put_unaligned_le32(it_present_val, it_present);
 295                 it_present++;
 296                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 297                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 298         }
 299
 300         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 301                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
 302                                   BIT(IEEE80211_RADIOTAP_EXT);
 303                 put_unaligned_le32(it_present_val, it_present);
 304                 it_present++;
 305                 it_present_val = rtap.present;
 306         }
 307
 308         put_unaligned_le32(it_present_val, it_present);
 309
 310         pos = (void *)(it_present + 1);
 311
 312         /* the order of the following fields is important */
 313
 314         /* IEEE80211_RADIOTAP_TSFT */
 315         if (ieee80211_have_rx_timestamp(status)) {
 316                 /* padding */
 317                 while ((pos - (u8 *)rthdr) & 7)
 318                         *pos++ = 0;
 319                 put_unaligned_le64(
 320                         ieee80211_calculate_rx_timestamp(local, status,
 321                                                          mpdulen, 0),
 322                         pos);
 323                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
 324                 pos += 8;
 325         }
 326
 327         /* IEEE80211_RADIOTAP_FLAGS */
 328         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 329                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 330         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 331                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 332         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 333                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 334         pos++;
 335
 336         /* IEEE80211_RADIOTAP_RATE */
 337         if (!rate || status->encoding != RX_ENC_LEGACY) {
 338                 /*
 339                  * Without rate information don't add it. If we have,
 340                  * MCS information is a separate field in radiotap,
 341                  * added below. The byte here is needed as padding
 342                  * for the channel though, so initialise it to 0.
 343                  */
 344                 *pos = 0;
 345         } else {
 346                 int shift = 0;
 347                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 348                 if (status->bw == RATE_INFO_BW_10)
 349                         shift = 1;
 350                 else if (status->bw == RATE_INFO_BW_5)
 351                         shift = 2;
 352                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 353         }
 354         pos++;
 355
 356         /* IEEE80211_RADIOTAP_CHANNEL */
 357         put_unaligned_le16(status->freq, pos);
 358         pos += 2;
 359         if (status->bw == RATE_INFO_BW_10)
 360                 channel_flags |= IEEE80211_CHAN_HALF;
 361         else if (status->bw == RATE_INFO_BW_5)
 362                 channel_flags |= IEEE80211_CHAN_QUARTER;
 363
 364         if (status->band == NL80211_BAND_5GHZ)
 365                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 366         else if (status->encoding != RX_ENC_LEGACY)
 367                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 368         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 369                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 370         else if (rate)
 371                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 372         else
 373                 channel_flags |= IEEE80211_CHAN_2GHZ;
 374         put_unaligned_le16(channel_flags, pos);
 375         pos += 2;
 376
 377         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 378         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 379             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 380                 *pos = status->signal;
 381                 rthdr->it_present |=
 382                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 383                 pos++;
 384         }
 385
 386         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 387
 388         if (!status->chains) {
 389                 /* IEEE80211_RADIOTAP_ANTENNA */
 390                 *pos = status->antenna;
 391                 pos++;
 392         }
 393
 394         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 395
 396         /* IEEE80211_RADIOTAP_RX_FLAGS */
 397         /* ensure 2 byte alignment for the 2 byte field as required */
 398         if ((pos - (u8 *)rthdr) & 1)
 399                 *pos++ = 0;
 400         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 401                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 402         put_unaligned_le16(rx_flags, pos);
 403         pos += 2;
 404
 405         if (status->encoding == RX_ENC_HT) {
 406                 unsigned int stbc;
 407
 408                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 409                 *pos++ = local->hw.radiotap_mcs_details;
 410                 *pos = 0;
 411                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 412                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 413                 if (status->bw == RATE_INFO_BW_40)
 414                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 415                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 416                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 417                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 418                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 419                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 420                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 421                 pos++;
 422                 *pos++ = status->rate_idx;
 423         }
 424
 425         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 426                 u16 flags = 0;
 427
 428                 /* ensure 4 byte alignment */
 429                 while ((pos - (u8 *)rthdr) & 3)
 430                         pos++;
 431                 rthdr->it_present |=
 432                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
 433                 put_unaligned_le32(status->ampdu_reference, pos);
 434                 pos += 4;
 435                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 436                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 437                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 438                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 439                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 440                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 441                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 442                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 443                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 444                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 445                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 446                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 447                 put_unaligned_le16(flags, pos);
 448                 pos += 2;
 449                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 450                         *pos++ = status->ampdu_delimiter_crc;
 451                 else
 452                         *pos++ = 0;
 453                 *pos++ = 0;
 454         }
 455
 456         if (status->encoding == RX_ENC_VHT) {
 457                 u16 known = local->hw.radiotap_vht_details;
 458
 459                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 460                 put_unaligned_le16(known, pos);
 461                 pos += 2;
 462                 /* flags */
 463                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 464                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 465                 /* in VHT, STBC is binary */
 466                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 467                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 468                 if (status->enc_flags & RX_ENC_FLAG_BF)
 469                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 470                 pos++;
 471                 /* bandwidth */
 472                 switch (status->bw) {
 473                 case RATE_INFO_BW_80:
 474                         *pos++ = 4;
 475                         break;
 476                 case RATE_INFO_BW_160:
 477                         *pos++ = 11;
 478                         break;
 479                 case RATE_INFO_BW_40:
 480                         *pos++ = 1;
 481                         break;
 482                 default:
 483                         *pos++ = 0;
 484                 }
 485                 /* MCS/NSS */
 486                 *pos = (status->rate_idx << 4) | status->nss;
 487                 pos += 4;
 488                 /* coding field */
 489                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 490                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 491                 pos++;
 492                 /* group ID */
 493                 pos++;
 494                 /* partial_aid */
 495                 pos += 2;
 496         }
 497
 498         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 499                 u16 accuracy = 0;
 500                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 501
 502                 rthdr->it_present |=
 503                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
 504
 505                 /* ensure 8 byte alignment */
 506                 while ((pos - (u8 *)rthdr) & 7)
 507                         pos++;
 508
 509                 put_unaligned_le64(status->device_timestamp, pos);
 510                 pos += sizeof(u64);
 511
 512                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 513                         accuracy = local->hw.radiotap_timestamp.accuracy;
 514                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 515                 }
 516                 put_unaligned_le16(accuracy, pos);
 517                 pos += sizeof(u16);
 518
 519                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 520                 *pos++ = flags;
 521         }
 522
 523         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 524                 *pos++ = status->chain_signal[chain];
 525                 *pos++ = chain;
 526         }
 527
 528         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 529                 /* ensure 2 byte alignment for the vendor field as required */
 530                 if ((pos - (u8 *)rthdr) & 1)
 531                         *pos++ = 0;
 532                 *pos++ = rtap.oui[0];
 533                 *pos++ = rtap.oui[1];
 534                 *pos++ = rtap.oui[2];
 535                 *pos++ = rtap.subns;
 536                 put_unaligned_le16(rtap.len, pos);
 537                 pos += 2;
 538                 /* align the actual payload as requested */
 539                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
 540                         *pos++ = 0;
 541                 /* data (and possible padding) already follows */
 542         }
 543 }
 544
 545 static struct sk_buff *
 546 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 547                            struct sk_buff **origskb,
 548                            struct ieee80211_rate *rate,
 549                            int rtap_space, bool use_origskb)
 550 {
 551         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 552         int rt_hdrlen, needed_headroom;
 553         struct sk_buff *skb;
 554
 555         /* room for the radiotap header based on driver features */
 556         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 557         needed_headroom = rt_hdrlen - rtap_space;
 558
 559         if (use_origskb) {
 560                 /* only need to expand headroom if necessary */
 561                 skb = *origskb;
 562                 *origskb = NULL;
 563
 564                 /*
 565                  * This shouldn't trigger often because most devices have an
 566                  * RX header they pull before we get here, and that should
 567                  * be big enough for our radiotap information. We should
 568                  * probably export the length to drivers so that we can have
 569                  * them allocate enough headroom to start with.
 570                  */
 571                 if (skb_headroom(skb) < needed_headroom &&
 572                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 573                         dev_kfree_skb(skb);
 574                         return NULL;
 575                 }
 576         } else {
 577                 /*
 578                  * Need to make a copy and possibly remove radiotap header
 579                  * and FCS from the original.
 580                  */
 581                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
 582
 583                 if (!skb)
 584                         return NULL;
 585         }
 586
 587         /* prepend radiotap information */
 588         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 589
 590         skb_reset_mac_header(skb);
 591         skb->ip_summed = CHECKSUM_UNNECESSARY;
 592         skb->pkt_type = PACKET_OTHERHOST;
 593         skb->protocol = htons(ETH_P_802_2);
 594
 595         return skb;
 596 }
 597
 598 /*
 599  * This function copies a received frame to all monitor interfaces and
 600  * returns a cleaned-up SKB that no longer includes the FCS nor the
 601  * radiotap header the driver might have added.
 602  */
 603 static struct sk_buff *
 604 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 605                      struct ieee80211_rate *rate)
 606 {
 607         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 608         struct ieee80211_sub_if_data *sdata;
 609         struct sk_buff *monskb = NULL;
 610         int present_fcs_len = 0;
 611         unsigned int rtap_space = 0;
 612         struct ieee80211_sub_if_data *monitor_sdata =
 613                 rcu_dereference(local->monitor_sdata);
 614         bool only_monitor = false;
 615
 616         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
 617                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
 618
 619                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
 620         }
 621
 622         /*
 623          * First, we may need to make a copy of the skb because
 624          *  (1) we need to modify it for radiotap (if not present), and
 625          *  (2) the other RX handlers will modify the skb we got.
 626          *
 627          * We don't need to, of course, if we aren't going to return
 628          * the SKB because it has a bad FCS/PLCP checksum.
 629          */
 630
 631         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 632                 if (unlikely(origskb->len <= FCS_LEN)) {
 633                         /* driver bug */
 634                         WARN_ON(1);
 635                         dev_kfree_skb(origskb);
 636                         return NULL;
 637                 }
 638                 present_fcs_len = FCS_LEN;
 639         }
 640
 641         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
 642         if (!pskb_may_pull(origskb, 2 + rtap_space)) {
 643                 dev_kfree_skb(origskb);
 644                 return NULL;
 645         }
 646
 647         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_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, rtap_space);
 656                 return origskb;
 657         }
 658
 659         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 660
 661         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 662                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 663                                                  &local->mon_list);
 664
 665                 if (!monskb)
 666                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 667                                                             rate, rtap_space,
 668                                                             only_monitor &&
 669                                                             last_monitor);
 670
 671                 if (monskb) {
 672                         struct sk_buff *skb;
 673
 674                         if (last_monitor) {
 675                                 skb = monskb;
 676                                 monskb = NULL;
 677                         } else {
 678                                 skb = skb_clone(monskb, GFP_ATOMIC);
 679                         }
 680
 681                         if (skb) {
 682                                 skb->dev = sdata->dev;
 683                                 ieee80211_rx_stats(skb->dev, skb->len);
 684                                 netif_receive_skb(skb);
 685                         }
 686                 }
 687
 688                 if (last_monitor)
 689                         break;
 690         }
 691
 692         /* this happens if last_monitor was erroneously false */
 693         dev_kfree_skb(monskb);
 694
 695         /* ditto */
 696         if (!origskb)
 697                 return NULL;
 698
 699         remove_monitor_info(origskb, present_fcs_len, rtap_space);
 700         return origskb;
 701 }
 702
 703 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 704 {
 705         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 706         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 707         int tid, seqno_idx, security_idx;
 708
 709         /* does the frame have a qos control field? */
 710         if (ieee80211_is_data_qos(hdr->frame_control)) {
 711                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 712                 /* frame has qos control */
 713                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 714                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 715                         status->rx_flags |= IEEE80211_RX_AMSDU;
 716
 717                 seqno_idx = tid;
 718                 security_idx = tid;
 719         } else {
 720                 /*
 721                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 722                  *
 723                  *      Sequence numbers for management frames, QoS data
 724                  *      frames with a broadcast/multicast address in the
 725                  *      Address 1 field, and all non-QoS data frames sent
 726                  *      by QoS STAs are assigned using an additional single
 727                  *      modulo-4096 counter, [...]
 728                  *
 729                  * We also use that counter for non-QoS STAs.
 730                  */
 731                 seqno_idx = IEEE80211_NUM_TIDS;
 732                 security_idx = 0;
 733                 if (ieee80211_is_mgmt(hdr->frame_control))
 734                         security_idx = IEEE80211_NUM_TIDS;
 735                 tid = 0;
 736         }
 737
 738         rx->seqno_idx = seqno_idx;
 739         rx->security_idx = security_idx;
 740         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 741          * For now, set skb->priority to 0 for other cases. */
 742         rx->skb->priority = (tid > 7) ? 0 : tid;
 743 }
 744
 745 /**
 746  * DOC: Packet alignment
 747  *
 748  * Drivers always need to pass packets that are aligned to two-byte boundaries
 749  * to the stack.
 750  *
 751  * Additionally, should, if possible, align the payload data in a way that
 752  * guarantees that the contained IP header is aligned to a four-byte
 753  * boundary. In the case of regular frames, this simply means aligning the
 754  * payload to a four-byte boundary (because either the IP header is directly
 755  * contained, or IV/RFC1042 headers that have a length divisible by four are
 756  * in front of it).  If the payload data is not properly aligned and the
 757  * architecture doesn't support efficient unaligned operations, mac80211
 758  * will align the data.
 759  *
 760  * With A-MSDU frames, however, the payload data address must yield two modulo
 761  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 762  * push the IP header further back to a multiple of four again. Thankfully, the
 763  * specs were sane enough this time around to require padding each A-MSDU
 764  * subframe to a length that is a multiple of four.
 765  *
 766  * Padding like Atheros hardware adds which is between the 802.11 header and
 767  * the payload is not supported, the driver is required to move the 802.11
 768  * header to be directly in front of the payload in that case.
 769  */
 770 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 771 {
 772 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 773         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 774 #endif
 775 }
 776
 777
 778 /* rx handlers */
 779
 780 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 781 {
 782         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 783
 784         if (is_multicast_ether_addr(hdr->addr1))
 785                 return 0;
 786
 787         return ieee80211_is_robust_mgmt_frame(skb);
 788 }
 789
 790
 791 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 792 {
 793         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 794
 795         if (!is_multicast_ether_addr(hdr->addr1))
 796                 return 0;
 797
 798         return ieee80211_is_robust_mgmt_frame(skb);
 799 }
 800
 801
 802 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 803 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 804 {
 805         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 806         struct ieee80211_mmie *mmie;
 807         struct ieee80211_mmie_16 *mmie16;
 808
 809         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 810                 return -1;
 811
 812         if (!ieee80211_is_robust_mgmt_frame(skb))
 813                 return -1; /* not a robust management frame */
 814
 815         mmie = (struct ieee80211_mmie *)
 816                 (skb->data + skb->len - sizeof(*mmie));
 817         if (mmie->element_id == WLAN_EID_MMIE &&
 818             mmie->length == sizeof(*mmie) - 2)
 819                 return le16_to_cpu(mmie->key_id);
 820
 821         mmie16 = (struct ieee80211_mmie_16 *)
 822                 (skb->data + skb->len - sizeof(*mmie16));
 823         if (skb->len >= 24 + sizeof(*mmie16) &&
 824             mmie16->element_id == WLAN_EID_MMIE &&
 825             mmie16->length == sizeof(*mmie16) - 2)
 826                 return le16_to_cpu(mmie16->key_id);
 827
 828         return -1;
 829 }
 830
 831 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
 832                                   struct sk_buff *skb)
 833 {
 834         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 835         __le16 fc;
 836         int hdrlen;
 837         u8 keyid;
 838
 839         fc = hdr->frame_control;
 840         hdrlen = ieee80211_hdrlen(fc);
 841
 842         if (skb->len < hdrlen + cs->hdr_len)
 843                 return -EINVAL;
 844
 845         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
 846         keyid &= cs->key_idx_mask;
 847         keyid >>= cs->key_idx_shift;
 848
 849         return keyid;
 850 }
 851
 852 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
 853 {
 854         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 855         char *dev_addr = rx->sdata->vif.addr;
 856
 857         if (ieee80211_is_data(hdr->frame_control)) {
 858                 if (is_multicast_ether_addr(hdr->addr1)) {
 859                         if (ieee80211_has_tods(hdr->frame_control) ||
 860                             !ieee80211_has_fromds(hdr->frame_control))
 861                                 return RX_DROP_MONITOR;
 862                         if (ether_addr_equal(hdr->addr3, dev_addr))
 863                                 return RX_DROP_MONITOR;
 864                 } else {
 865                         if (!ieee80211_has_a4(hdr->frame_control))
 866                                 return RX_DROP_MONITOR;
 867                         if (ether_addr_equal(hdr->addr4, dev_addr))
 868                                 return RX_DROP_MONITOR;
 869                 }
 870         }
 871
 872         /* If there is not an established peer link and this is not a peer link
 873          * establisment frame, beacon or probe, drop the frame.
 874          */
 875
 876         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
 877                 struct ieee80211_mgmt *mgmt;
 878
 879                 if (!ieee80211_is_mgmt(hdr->frame_control))
 880                         return RX_DROP_MONITOR;
 881
 882                 if (ieee80211_is_action(hdr->frame_control)) {
 883                         u8 category;
 884
 885                         /* make sure category field is present */
 886                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
 887                                 return RX_DROP_MONITOR;
 888
 889                         mgmt = (struct ieee80211_mgmt *)hdr;
 890                         category = mgmt->u.action.category;
 891                         if (category != WLAN_CATEGORY_MESH_ACTION &&
 892                             category != WLAN_CATEGORY_SELF_PROTECTED)
 893                                 return RX_DROP_MONITOR;
 894                         return RX_CONTINUE;
 895                 }
 896
 897                 if (ieee80211_is_probe_req(hdr->frame_control) ||
 898                     ieee80211_is_probe_resp(hdr->frame_control) ||
 899                     ieee80211_is_beacon(hdr->frame_control) ||
 900                     ieee80211_is_auth(hdr->frame_control))
 901                         return RX_CONTINUE;
 902
 903                 return RX_DROP_MONITOR;
 904         }
 905
 906         return RX_CONTINUE;
 907 }
 908
 909 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
 910                                               int index)
 911 {
 912         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
 913         struct sk_buff *tail = skb_peek_tail(frames);
 914         struct ieee80211_rx_status *status;
 915
 916         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
 917                 return true;
 918
 919         if (!tail)
 920                 return false;
 921
 922         status = IEEE80211_SKB_RXCB(tail);
 923         if (status->flag & RX_FLAG_AMSDU_MORE)
 924                 return false;
 925
 926         return true;
 927 }
 928
 929 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
 930                                             struct tid_ampdu_rx *tid_agg_rx,
 931                                             int index,
 932                                             struct sk_buff_head *frames)
 933 {
 934         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
 935         struct sk_buff *skb;
 936         struct ieee80211_rx_status *status;
 937
 938         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 939
 940         if (skb_queue_empty(skb_list))
 941                 goto no_frame;
 942
 943         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
 944                 __skb_queue_purge(skb_list);
 945                 goto no_frame;
 946         }
 947
 948         /* release frames from the reorder ring buffer */
 949         tid_agg_rx->stored_mpdu_num--;
 950         while ((skb = __skb_dequeue(skb_list))) {
 951                 status = IEEE80211_SKB_RXCB(skb);
 952                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
 953                 __skb_queue_tail(frames, skb);
 954         }
 955
 956 no_frame:
 957         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
 958         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
 959 }
 960
 961 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
 962                                              struct tid_ampdu_rx *tid_agg_rx,
 963                                              u16 head_seq_num,
 964                                              struct sk_buff_head *frames)
 965 {
 966         int index;
 967
 968         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 969
 970         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
 971                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 972                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
 973                                                 frames);
 974         }
 975 }
 976
 977 /*
 978  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 979  * the skb was added to the buffer longer than this time ago, the earlier
 980  * frames that have not yet been received are assumed to be lost and the skb
 981  * can be released for processing. This may also release other skb's from the
 982  * reorder buffer if there are no additional gaps between the frames.
 983  *
 984  * Callers must hold tid_agg_rx->reorder_lock.
 985  */
 986 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
 987
 988 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
 989                                           struct tid_ampdu_rx *tid_agg_rx,
 990                                           struct sk_buff_head *frames)
 991 {
 992         int index, i, j;
 993
 994         lockdep_assert_held(&tid_agg_rx->reorder_lock);
 995
 996         /* release the buffer until next missing frame */
 997         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
 998         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
 999             tid_agg_rx->stored_mpdu_num) {
1000                 /*
1001                  * No buffers ready to be released, but check whether any
1002                  * frames in the reorder buffer have timed out.
1003                  */
1004                 int skipped = 1;
1005                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1006                      j = (j + 1) % tid_agg_rx->buf_size) {
1007                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1008                                 skipped++;
1009                                 continue;
1010                         }
1011                         if (skipped &&
1012                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1013                                         HT_RX_REORDER_BUF_TIMEOUT))
1014                                 goto set_release_timer;
1015
1016                         /* don't leave incomplete A-MSDUs around */
1017                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1018                              i = (i + 1) % tid_agg_rx->buf_size)
1019                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1020
1021                         ht_dbg_ratelimited(sdata,
1022                                            "release an RX reorder frame due to timeout on earlier frames\n");
1023                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1024                                                         frames);
1025
1026                         /*
1027                          * Increment the head seq# also for the skipped slots.
1028                          */
1029                         tid_agg_rx->head_seq_num =
1030                                 (tid_agg_rx->head_seq_num +
1031                                  skipped) & IEEE80211_SN_MASK;
1032                         skipped = 0;
1033                 }
1034         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1035                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1036                                                 frames);
1037                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1038         }
1039
1040         if (tid_agg_rx->stored_mpdu_num) {
1041                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1042
1043                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1044                      j = (j + 1) % tid_agg_rx->buf_size) {
1045                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1046                                 break;
1047                 }
1048
1049  set_release_timer:
1050
1051                 if (!tid_agg_rx->removed)
1052                         mod_timer(&tid_agg_rx->reorder_timer,
1053                                   tid_agg_rx->reorder_time[j] + 1 +
1054                                   HT_RX_REORDER_BUF_TIMEOUT);
1055         } else {
1056                 del_timer(&tid_agg_rx->reorder_timer);
1057         }
1058 }
1059
1060 /*
1061  * As this function belongs to the RX path it must be under
1062  * rcu_read_lock protection. It returns false if the frame
1063  * can be processed immediately, true if it was consumed.
1064  */
1065 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1066                                              struct tid_ampdu_rx *tid_agg_rx,
1067                                              struct sk_buff *skb,
1068                                              struct sk_buff_head *frames)
1069 {
1070         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1071         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1072         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1073         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1074         u16 head_seq_num, buf_size;
1075         int index;
1076         bool ret = true;
1077
1078         spin_lock(&tid_agg_rx->reorder_lock);
1079
1080         /*
1081          * Offloaded BA sessions have no known starting sequence number so pick
1082          * one from first Rxed frame for this tid after BA was started.
1083          */
1084         if (unlikely(tid_agg_rx->auto_seq)) {
1085                 tid_agg_rx->auto_seq = false;
1086                 tid_agg_rx->ssn = mpdu_seq_num;
1087                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1088         }
1089
1090         buf_size = tid_agg_rx->buf_size;
1091         head_seq_num = tid_agg_rx->head_seq_num;
1092
1093         /*
1094          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1095          * be reordered.
1096          */
1097         if (unlikely(!tid_agg_rx->started)) {
1098                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1099                         ret = false;
1100                         goto out;
1101                 }
1102                 tid_agg_rx->started = true;
1103         }
1104
1105         /* frame with out of date sequence number */
1106         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1107                 dev_kfree_skb(skb);
1108                 goto out;
1109         }
1110
1111         /*
1112          * If frame the sequence number exceeds our buffering window
1113          * size release some previous frames to make room for this one.
1114          */
1115         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1116                 head_seq_num = ieee80211_sn_inc(
1117                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1118                 /* release stored frames up to new head to stack */
1119                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1120                                                  head_seq_num, frames);
1121         }
1122
1123         /* Now the new frame is always in the range of the reordering buffer */
1124
1125         index = mpdu_seq_num % tid_agg_rx->buf_size;
1126
1127         /* check if we already stored this frame */
1128         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1129                 dev_kfree_skb(skb);
1130                 goto out;
1131         }
1132
1133         /*
1134          * If the current MPDU is in the right order and nothing else
1135          * is stored we can process it directly, no need to buffer it.
1136          * If it is first but there's something stored, we may be able
1137          * to release frames after this one.
1138          */
1139         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1140             tid_agg_rx->stored_mpdu_num == 0) {
1141                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1142                         tid_agg_rx->head_seq_num =
1143                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1144                 ret = false;
1145                 goto out;
1146         }
1147
1148         /* put the frame in the reordering buffer */
1149         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1150         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1151                 tid_agg_rx->reorder_time[index] = jiffies;
1152                 tid_agg_rx->stored_mpdu_num++;
1153                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1154         }
1155
1156  out:
1157         spin_unlock(&tid_agg_rx->reorder_lock);
1158         return ret;
1159 }
1160
1161 /*
1162  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1163  * true if the MPDU was buffered, false if it should be processed.
1164  */
1165 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1166                                        struct sk_buff_head *frames)
1167 {
1168         struct sk_buff *skb = rx->skb;
1169         struct ieee80211_local *local = rx->local;
1170         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1171         struct sta_info *sta = rx->sta;
1172         struct tid_ampdu_rx *tid_agg_rx;
1173         u16 sc;
1174         u8 tid, ack_policy;
1175
1176         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1177             is_multicast_ether_addr(hdr->addr1))
1178                 goto dont_reorder;
1179
1180         /*
1181          * filter the QoS data rx stream according to
1182          * STA/TID and check if this STA/TID is on aggregation
1183          */
1184
1185         if (!sta)
1186                 goto dont_reorder;
1187
1188         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1189                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1190         tid = ieee80211_get_tid(hdr);
1191
1192         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1193         if (!tid_agg_rx) {
1194                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1195                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1196                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1197                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1198                                              WLAN_BACK_RECIPIENT,
1199                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1200                 goto dont_reorder;
1201         }
1202
1203         /* qos null data frames are excluded */
1204         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1205                 goto dont_reorder;
1206
1207         /* not part of a BA session */
1208         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1209             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1210                 goto dont_reorder;
1211
1212         /* new, potentially un-ordered, ampdu frame - process it */
1213
1214         /* reset session timer */
1215         if (tid_agg_rx->timeout)
1216                 tid_agg_rx->last_rx = jiffies;
1217
1218         /* if this mpdu is fragmented - terminate rx aggregation session */
1219         sc = le16_to_cpu(hdr->seq_ctrl);
1220         if (sc & IEEE80211_SCTL_FRAG) {
1221                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1222                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1223                 return;
1224         }
1225
1226         /*
1227          * No locking needed -- we will only ever process one
1228          * RX packet at a time, and thus own tid_agg_rx. All
1229          * other code manipulating it needs to (and does) make
1230          * sure that we cannot get to it any more before doing
1231          * anything with it.
1232          */
1233         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1234                                              frames))
1235                 return;
1236
1237  dont_reorder:
1238         __skb_queue_tail(frames, skb);
1239 }
1240
1241 static ieee80211_rx_result debug_noinline
1242 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1243 {
1244         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1245         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1246
1247         if (status->flag & RX_FLAG_DUP_VALIDATED)
1248                 return RX_CONTINUE;
1249
1250         /*
1251          * Drop duplicate 802.11 retransmissions
1252          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1253          */
1254
1255         if (rx->skb->len < 24)
1256                 return RX_CONTINUE;
1257
1258         if (ieee80211_is_ctl(hdr->frame_control) ||
1259             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1260             is_multicast_ether_addr(hdr->addr1))
1261                 return RX_CONTINUE;
1262
1263         if (!rx->sta)
1264                 return RX_CONTINUE;
1265
1266         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1267                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1268                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1269                 rx->sta->rx_stats.num_duplicates++;
1270                 return RX_DROP_UNUSABLE;
1271         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1272                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1273         }
1274
1275         return RX_CONTINUE;
1276 }
1277
1278 static ieee80211_rx_result debug_noinline
1279 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1280 {
1281         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1282
1283         /* Drop disallowed frame classes based on STA auth/assoc state;
1284          * IEEE 802.11, Chap 5.5.
1285          *
1286          * mac80211 filters only based on association state, i.e. it drops
1287          * Class 3 frames from not associated stations. hostapd sends
1288          * deauth/disassoc frames when needed. In addition, hostapd is
1289          * responsible for filtering on both auth and assoc states.
1290          */
1291
1292         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1293                 return ieee80211_rx_mesh_check(rx);
1294
1295         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1296                       ieee80211_is_pspoll(hdr->frame_control)) &&
1297                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1298                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1299                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1300                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1301                 /*
1302                  * accept port control frames from the AP even when it's not
1303                  * yet marked ASSOC to prevent a race where we don't set the
1304                  * assoc bit quickly enough before it sends the first frame
1305                  */
1306                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1307                     ieee80211_is_data_present(hdr->frame_control)) {
1308                         unsigned int hdrlen;
1309                         __be16 ethertype;
1310
1311                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1312
1313                         if (rx->skb->len < hdrlen + 8)
1314                                 return RX_DROP_MONITOR;
1315
1316                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1317                         if (ethertype == rx->sdata->control_port_protocol)
1318                                 return RX_CONTINUE;
1319                 }
1320
1321                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1322                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1323                                                hdr->addr2,
1324                                                GFP_ATOMIC))
1325                         return RX_DROP_UNUSABLE;
1326
1327                 return RX_DROP_MONITOR;
1328         }
1329
1330         return RX_CONTINUE;
1331 }
1332
1333
1334 static ieee80211_rx_result debug_noinline
1335 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1336 {
1337         struct ieee80211_local *local;
1338         struct ieee80211_hdr *hdr;
1339         struct sk_buff *skb;
1340
1341         local = rx->local;
1342         skb = rx->skb;
1343         hdr = (struct ieee80211_hdr *) skb->data;
1344
1345         if (!local->pspolling)
1346                 return RX_CONTINUE;
1347
1348         if (!ieee80211_has_fromds(hdr->frame_control))
1349                 /* this is not from AP */
1350                 return RX_CONTINUE;
1351
1352         if (!ieee80211_is_data(hdr->frame_control))
1353                 return RX_CONTINUE;
1354
1355         if (!ieee80211_has_moredata(hdr->frame_control)) {
1356                 /* AP has no more frames buffered for us */
1357                 local->pspolling = false;
1358                 return RX_CONTINUE;
1359         }
1360
1361         /* more data bit is set, let's request a new frame from the AP */
1362         ieee80211_send_pspoll(local, rx->sdata);
1363
1364         return RX_CONTINUE;
1365 }
1366
1367 static void sta_ps_start(struct sta_info *sta)
1368 {
1369         struct ieee80211_sub_if_data *sdata = sta->sdata;
1370         struct ieee80211_local *local = sdata->local;
1371         struct ps_data *ps;
1372         int tid;
1373
1374         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1375             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1376                 ps = &sdata->bss->ps;
1377         else
1378                 return;
1379
1380         atomic_inc(&ps->num_sta_ps);
1381         set_sta_flag(sta, WLAN_STA_PS_STA);
1382         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1383                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1384         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1385                sta->sta.addr, sta->sta.aid);
1386
1387         ieee80211_clear_fast_xmit(sta);
1388
1389         if (!sta->sta.txq[0])
1390                 return;
1391
1392         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1393                 if (txq_has_queue(sta->sta.txq[tid]))
1394                         set_bit(tid, &sta->txq_buffered_tids);
1395                 else
1396                         clear_bit(tid, &sta->txq_buffered_tids);
1397         }
1398 }
1399
1400 static void sta_ps_end(struct sta_info *sta)
1401 {
1402         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1403                sta->sta.addr, sta->sta.aid);
1404
1405         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1406                 /*
1407                  * Clear the flag only if the other one is still set
1408                  * so that the TX path won't start TX'ing new frames
1409                  * directly ... In the case that the driver flag isn't
1410                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1411                  */
1412                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1413                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1414                        sta->sta.addr, sta->sta.aid);
1415                 return;
1416         }
1417
1418         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1419         clear_sta_flag(sta, WLAN_STA_PS_STA);
1420         ieee80211_sta_ps_deliver_wakeup(sta);
1421 }
1422
1423 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1424 {
1425         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1426         bool in_ps;
1427
1428         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1429
1430         /* Don't let the same PS state be set twice */
1431         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1432         if ((start && in_ps) || (!start && !in_ps))
1433                 return -EINVAL;
1434
1435         if (start)
1436                 sta_ps_start(sta);
1437         else
1438                 sta_ps_end(sta);
1439
1440         return 0;
1441 }
1442 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1443
1444 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1445 {
1446         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1447
1448         if (test_sta_flag(sta, WLAN_STA_SP))
1449                 return;
1450
1451         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1452                 ieee80211_sta_ps_deliver_poll_response(sta);
1453         else
1454                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1455 }
1456 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1457
1458 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1459 {
1460         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1461         int ac = ieee80211_ac_from_tid(tid);
1462
1463         /*
1464          * If this AC is not trigger-enabled do nothing unless the
1465          * driver is calling us after it already checked.
1466          *
1467          * NB: This could/should check a separate bitmap of trigger-
1468          * enabled queues, but for now we only implement uAPSD w/o
1469          * TSPEC changes to the ACs, so they're always the same.
1470          */
1471         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1472             tid != IEEE80211_NUM_TIDS)
1473                 return;
1474
1475         /* if we are in a service period, do nothing */
1476         if (test_sta_flag(sta, WLAN_STA_SP))
1477                 return;
1478
1479         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1480                 ieee80211_sta_ps_deliver_uapsd(sta);
1481         else
1482                 set_sta_flag(sta, WLAN_STA_UAPSD);
1483 }
1484 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1485
1486 static ieee80211_rx_result debug_noinline
1487 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1488 {
1489         struct ieee80211_sub_if_data *sdata = rx->sdata;
1490         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1491         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1492
1493         if (!rx->sta)
1494                 return RX_CONTINUE;
1495
1496         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1497             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1498                 return RX_CONTINUE;
1499
1500         /*
1501          * The device handles station powersave, so don't do anything about
1502          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1503          * it to mac80211 since they're handled.)
1504          */
1505         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1506                 return RX_CONTINUE;
1507
1508         /*
1509          * Don't do anything if the station isn't already asleep. In
1510          * the uAPSD case, the station will probably be marked asleep,
1511          * in the PS-Poll case the station must be confused ...
1512          */
1513         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1514                 return RX_CONTINUE;
1515
1516         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1517                 ieee80211_sta_pspoll(&rx->sta->sta);
1518
1519                 /* Free PS Poll skb here instead of returning RX_DROP that would
1520                  * count as an dropped frame. */
1521                 dev_kfree_skb(rx->skb);
1522
1523                 return RX_QUEUED;
1524         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1525                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1526                    ieee80211_has_pm(hdr->frame_control) &&
1527                    (ieee80211_is_data_qos(hdr->frame_control) ||
1528                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1529                 u8 tid = ieee80211_get_tid(hdr);
1530
1531                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1532         }
1533
1534         return RX_CONTINUE;
1535 }
1536
1537 static ieee80211_rx_result debug_noinline
1538 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1539 {
1540         struct sta_info *sta = rx->sta;
1541         struct sk_buff *skb = rx->skb;
1542         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1543         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1544         int i;
1545
1546         if (!sta)
1547                 return RX_CONTINUE;
1548
1549         /*
1550          * Update last_rx only for IBSS packets which are for the current
1551          * BSSID and for station already AUTHORIZED to avoid keeping the
1552          * current IBSS network alive in cases where other STAs start
1553          * using different BSSID. This will also give the station another
1554          * chance to restart the authentication/authorization in case
1555          * something went wrong the first time.
1556          */
1557         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1558                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1559                                                 NL80211_IFTYPE_ADHOC);
1560                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1561                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1562                         sta->rx_stats.last_rx = jiffies;
1563                         if (ieee80211_is_data(hdr->frame_control) &&
1564                             !is_multicast_ether_addr(hdr->addr1))
1565                                 sta->rx_stats.last_rate =
1566                                         sta_stats_encode_rate(status);
1567                 }
1568         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1569                 sta->rx_stats.last_rx = jiffies;
1570         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1571                 /*
1572                  * Mesh beacons will update last_rx when if they are found to
1573                  * match the current local configuration when processed.
1574                  */
1575                 sta->rx_stats.last_rx = jiffies;
1576                 if (ieee80211_is_data(hdr->frame_control))
1577                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1578         }
1579
1580         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1581                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1582
1583         sta->rx_stats.fragments++;
1584
1585         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1586         sta->rx_stats.bytes += rx->skb->len;
1587         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1588
1589         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1590                 sta->rx_stats.last_signal = status->signal;
1591                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1592         }
1593
1594         if (status->chains) {
1595                 sta->rx_stats.chains = status->chains;
1596                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1597                         int signal = status->chain_signal[i];
1598
1599                         if (!(status->chains & BIT(i)))
1600                                 continue;
1601
1602                         sta->rx_stats.chain_signal_last[i] = signal;
1603                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1604                                         -signal);
1605                 }
1606         }
1607
1608         /*
1609          * Change STA power saving mode only at the end of a frame
1610          * exchange sequence, and only for a data or management
1611          * frame as specified in IEEE 802.11-2016 11.2.3.2
1612          */
1613         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1614             !ieee80211_has_morefrags(hdr->frame_control) &&
1615             (ieee80211_is_mgmt(hdr->frame_control) ||
1616              ieee80211_is_data(hdr->frame_control)) &&
1617             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1618             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1619              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1620                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1621                         if (!ieee80211_has_pm(hdr->frame_control))
1622                                 sta_ps_end(sta);
1623                 } else {
1624                         if (ieee80211_has_pm(hdr->frame_control))
1625                                 sta_ps_start(sta);
1626                 }
1627         }
1628
1629         /* mesh power save support */
1630         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1631                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1632
1633         /*
1634          * Drop (qos-)data::nullfunc frames silently, since they
1635          * are used only to control station power saving mode.
1636          */
1637         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1638             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1639                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1640
1641                 /*
1642                  * If we receive a 4-addr nullfunc frame from a STA
1643                  * that was not moved to a 4-addr STA vlan yet send
1644                  * the event to userspace and for older hostapd drop
1645                  * the frame to the monitor interface.
1646                  */
1647                 if (ieee80211_has_a4(hdr->frame_control) &&
1648                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1649                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1650                       !rx->sdata->u.vlan.sta))) {
1651                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1652                                 cfg80211_rx_unexpected_4addr_frame(
1653                                         rx->sdata->dev, sta->sta.addr,
1654                                         GFP_ATOMIC);
1655                         return RX_DROP_MONITOR;
1656                 }
1657                 /*
1658                  * Update counter and free packet here to avoid
1659                  * counting this as a dropped packed.
1660                  */
1661                 sta->rx_stats.packets++;
1662                 dev_kfree_skb(rx->skb);
1663                 return RX_QUEUED;
1664         }
1665
1666         return RX_CONTINUE;
1667 } /* ieee80211_rx_h_sta_process */
1668
1669 static ieee80211_rx_result debug_noinline
1670 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1671 {
1672         struct sk_buff *skb = rx->skb;
1673         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1674         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1675         int keyidx;
1676         int hdrlen;
1677         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1678         struct ieee80211_key *sta_ptk = NULL;
1679         int mmie_keyidx = -1;
1680         __le16 fc;
1681         const struct ieee80211_cipher_scheme *cs = NULL;
1682
1683         /*
1684          * Key selection 101
1685          *
1686          * There are four types of keys:
1687          *  - GTK (group keys)
1688          *  - IGTK (group keys for management frames)
1689          *  - PTK (pairwise keys)
1690          *  - STK (station-to-station pairwise keys)
1691          *
1692          * When selecting a key, we have to distinguish between multicast
1693          * (including broadcast) and unicast frames, the latter can only
1694          * use PTKs and STKs while the former always use GTKs and IGTKs.
1695          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1696          * unicast frames can also use key indices like GTKs. Hence, if we
1697          * don't have a PTK/STK we check the key index for a WEP key.
1698          *
1699          * Note that in a regular BSS, multicast frames are sent by the
1700          * AP only, associated stations unicast the frame to the AP first
1701          * which then multicasts it on their behalf.
1702          *
1703          * There is also a slight problem in IBSS mode: GTKs are negotiated
1704          * with each station, that is something we don't currently handle.
1705          * The spec seems to expect that one negotiates the same key with
1706          * every station but there's no such requirement; VLANs could be
1707          * possible.
1708          */
1709
1710         /* start without a key */
1711         rx->key = NULL;
1712         fc = hdr->frame_control;
1713
1714         if (rx->sta) {
1715                 int keyid = rx->sta->ptk_idx;
1716
1717                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1718                         cs = rx->sta->cipher_scheme;
1719                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1720                         if (unlikely(keyid < 0))
1721                                 return RX_DROP_UNUSABLE;
1722                 }
1723                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1724         }
1725
1726         if (!ieee80211_has_protected(fc))
1727                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1728
1729         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1730                 rx->key = sta_ptk;
1731                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1732                     (status->flag & RX_FLAG_IV_STRIPPED))
1733                         return RX_CONTINUE;
1734                 /* Skip decryption if the frame is not protected. */
1735                 if (!ieee80211_has_protected(fc))
1736                         return RX_CONTINUE;
1737         } else if (mmie_keyidx >= 0) {
1738                 /* Broadcast/multicast robust management frame / BIP */
1739                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1740                     (status->flag & RX_FLAG_IV_STRIPPED))
1741                         return RX_CONTINUE;
1742
1743                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1744                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1745                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1746                 if (rx->sta) {
1747                         if (ieee80211_is_group_privacy_action(skb) &&
1748                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1749                                 return RX_DROP_MONITOR;
1750
1751                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1752                 }
1753                 if (!rx->key)
1754                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1755         } else if (!ieee80211_has_protected(fc)) {
1756                 /*
1757                  * The frame was not protected, so skip decryption. However, we
1758                  * need to set rx->key if there is a key that could have been
1759                  * used so that the frame may be dropped if encryption would
1760                  * have been expected.
1761                  */
1762                 struct ieee80211_key *key = NULL;
1763                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1764                 int i;
1765
1766                 if (ieee80211_is_mgmt(fc) &&
1767                     is_multicast_ether_addr(hdr->addr1) &&
1768                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1769                         rx->key = key;
1770                 else {
1771                         if (rx->sta) {
1772                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1773                                         key = rcu_dereference(rx->sta->gtk[i]);
1774                                         if (key)
1775                                                 break;
1776                                 }
1777                         }
1778                         if (!key) {
1779                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1780                                         key = rcu_dereference(sdata->keys[i]);
1781                                         if (key)
1782                                                 break;
1783                                 }
1784                         }
1785                         if (key)
1786                                 rx->key = key;
1787                 }
1788                 return RX_CONTINUE;
1789         } else {
1790                 u8 keyid;
1791
1792                 /*
1793                  * The device doesn't give us the IV so we won't be
1794                  * able to look up the key. That's ok though, we
1795                  * don't need to decrypt the frame, we just won't
1796                  * be able to keep statistics accurate.
1797                  * Except for key threshold notifications, should
1798                  * we somehow allow the driver to tell us which key
1799                  * the hardware used if this flag is set?
1800                  */
1801                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1802                     (status->flag & RX_FLAG_IV_STRIPPED))
1803                         return RX_CONTINUE;
1804
1805                 hdrlen = ieee80211_hdrlen(fc);
1806
1807                 if (cs) {
1808                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1809
1810                         if (unlikely(keyidx < 0))
1811                                 return RX_DROP_UNUSABLE;
1812                 } else {
1813                         if (rx->skb->len < 8 + hdrlen)
1814                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1815                         /*
1816                          * no need to call ieee80211_wep_get_keyidx,
1817                          * it verifies a bunch of things we've done already
1818                          */
1819                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1820                         keyidx = keyid >> 6;
1821                 }
1822
1823                 /* check per-station GTK first, if multicast packet */
1824                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1825                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1826
1827                 /* if not found, try default key */
1828                 if (!rx->key) {
1829                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1830
1831                         /*
1832                          * RSNA-protected unicast frames should always be
1833                          * sent with pairwise or station-to-station keys,
1834                          * but for WEP we allow using a key index as well.
1835                          */
1836                         if (rx->key &&
1837                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1838                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1839                             !is_multicast_ether_addr(hdr->addr1))
1840                                 rx->key = NULL;
1841                 }
1842         }
1843
1844         if (rx->key) {
1845                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1846                         return RX_DROP_MONITOR;
1847
1848                 /* TODO: add threshold stuff again */
1849         } else {
1850                 return RX_DROP_MONITOR;
1851         }
1852
1853         switch (rx->key->conf.cipher) {
1854         case WLAN_CIPHER_SUITE_WEP40:
1855         case WLAN_CIPHER_SUITE_WEP104:
1856                 result = ieee80211_crypto_wep_decrypt(rx);
1857                 break;
1858         case WLAN_CIPHER_SUITE_TKIP:
1859                 result = ieee80211_crypto_tkip_decrypt(rx);
1860                 break;
1861         case WLAN_CIPHER_SUITE_CCMP:
1862                 result = ieee80211_crypto_ccmp_decrypt(
1863                         rx, IEEE80211_CCMP_MIC_LEN);
1864                 break;
1865         case WLAN_CIPHER_SUITE_CCMP_256:
1866                 result = ieee80211_crypto_ccmp_decrypt(
1867                         rx, IEEE80211_CCMP_256_MIC_LEN);
1868                 break;
1869         case WLAN_CIPHER_SUITE_AES_CMAC:
1870                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1871                 break;
1872         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1873                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1874                 break;
1875         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1876         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1877                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1878                 break;
1879         case WLAN_CIPHER_SUITE_GCMP:
1880         case WLAN_CIPHER_SUITE_GCMP_256:
1881                 result = ieee80211_crypto_gcmp_decrypt(rx);
1882                 break;
1883         default:
1884                 result = ieee80211_crypto_hw_decrypt(rx);
1885         }
1886
1887         /* the hdr variable is invalid after the decrypt handlers */
1888
1889         /* either the frame has been decrypted or will be dropped */
1890         status->flag |= RX_FLAG_DECRYPTED;
1891
1892         return result;
1893 }
1894
1895 static inline struct ieee80211_fragment_entry *
1896 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1897                          unsigned int frag, unsigned int seq, int rx_queue,
1898                          struct sk_buff **skb)
1899 {
1900         struct ieee80211_fragment_entry *entry;
1901
1902         entry = &sdata->fragments[sdata->fragment_next++];
1903         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1904                 sdata->fragment_next = 0;
1905
1906         if (!skb_queue_empty(&entry->skb_list))
1907                 __skb_queue_purge(&entry->skb_list);
1908
1909         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1910         *skb = NULL;
1911         entry->first_frag_time = jiffies;
1912         entry->seq = seq;
1913         entry->rx_queue = rx_queue;
1914         entry->last_frag = frag;
1915         entry->check_sequential_pn = false;
1916         entry->extra_len = 0;
1917
1918         return entry;
1919 }
1920
1921 static inline struct ieee80211_fragment_entry *
1922 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1923                           unsigned int frag, unsigned int seq,
1924                           int rx_queue, struct ieee80211_hdr *hdr)
1925 {
1926         struct ieee80211_fragment_entry *entry;
1927         int i, idx;
1928
1929         idx = sdata->fragment_next;
1930         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1931                 struct ieee80211_hdr *f_hdr;
1932
1933                 idx--;
1934                 if (idx < 0)
1935                         idx = IEEE80211_FRAGMENT_MAX - 1;
1936
1937                 entry = &sdata->fragments[idx];
1938                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1939                     entry->rx_queue != rx_queue ||
1940                     entry->last_frag + 1 != frag)
1941                         continue;
1942
1943                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1944
1945                 /*
1946                  * Check ftype and addresses are equal, else check next fragment
1947                  */
1948                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1949                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1950                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1951                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1952                         continue;
1953
1954                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1955                         __skb_queue_purge(&entry->skb_list);
1956                         continue;
1957                 }
1958                 return entry;
1959         }
1960
1961         return NULL;
1962 }
1963
1964 static ieee80211_rx_result debug_noinline
1965 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1966 {
1967         struct ieee80211_hdr *hdr;
1968         u16 sc;
1969         __le16 fc;
1970         unsigned int frag, seq;
1971         struct ieee80211_fragment_entry *entry;
1972         struct sk_buff *skb;
1973
1974         hdr = (struct ieee80211_hdr *)rx->skb->data;
1975         fc = hdr->frame_control;
1976
1977         if (ieee80211_is_ctl(fc))
1978                 return RX_CONTINUE;
1979
1980         sc = le16_to_cpu(hdr->seq_ctrl);
1981         frag = sc & IEEE80211_SCTL_FRAG;
1982
1983         if (is_multicast_ether_addr(hdr->addr1)) {
1984                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1985                 goto out_no_led;
1986         }
1987
1988         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1989                 goto out;
1990
1991         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1992
1993         if (skb_linearize(rx->skb))
1994                 return RX_DROP_UNUSABLE;
1995
1996         /*
1997          *  skb_linearize() might change the skb->data and
1998          *  previously cached variables (in this case, hdr) need to
1999          *  be refreshed with the new data.
2000          */
2001         hdr = (struct ieee80211_hdr *)rx->skb->data;
2002         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2003
2004         if (frag == 0) {
2005                 /* This is the first fragment of a new frame. */
2006                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2007                                                  rx->seqno_idx, &(rx->skb));
2008                 if (rx->key &&
2009                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2010                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2011                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2012                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2013                     ieee80211_has_protected(fc)) {
2014                         int queue = rx->security_idx;
2015
2016                         /* Store CCMP/GCMP PN so that we can verify that the
2017                          * next fragment has a sequential PN value.
2018                          */
2019                         entry->check_sequential_pn = true;
2020                         memcpy(entry->last_pn,
2021                                rx->key->u.ccmp.rx_pn[queue],
2022                                IEEE80211_CCMP_PN_LEN);
2023                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2024                                               u.ccmp.rx_pn) !=
2025                                      offsetof(struct ieee80211_key,
2026                                               u.gcmp.rx_pn));
2027                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2028                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2029                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2030                                      IEEE80211_GCMP_PN_LEN);
2031                 }
2032                 return RX_QUEUED;
2033         }
2034
2035         /* This is a fragment for a frame that should already be pending in
2036          * fragment cache. Add this fragment to the end of the pending entry.
2037          */
2038         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2039                                           rx->seqno_idx, hdr);
2040         if (!entry) {
2041                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2042                 return RX_DROP_MONITOR;
2043         }
2044
2045         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2046          *  MPDU PN values are not incrementing in steps of 1."
2047          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2048          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2049          */
2050         if (entry->check_sequential_pn) {
2051                 int i;
2052                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2053                 int queue;
2054
2055                 if (!rx->key ||
2056                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2057                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2058                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2059                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2060                         return RX_DROP_UNUSABLE;
2061                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2062                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2063                         pn[i]++;
2064                         if (pn[i])
2065                                 break;
2066                 }
2067                 queue = rx->security_idx;
2068                 rpn = rx->key->u.ccmp.rx_pn[queue];
2069                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2070                         return RX_DROP_UNUSABLE;
2071                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2072         }
2073
2074         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2075         __skb_queue_tail(&entry->skb_list, rx->skb);
2076         entry->last_frag = frag;
2077         entry->extra_len += rx->skb->len;
2078         if (ieee80211_has_morefrags(fc)) {
2079                 rx->skb = NULL;
2080                 return RX_QUEUED;
2081         }
2082
2083         rx->skb = __skb_dequeue(&entry->skb_list);
2084         if (skb_tailroom(rx->skb) < entry->extra_len) {
2085                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2086                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2087                                               GFP_ATOMIC))) {
2088                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2089                         __skb_queue_purge(&entry->skb_list);
2090                         return RX_DROP_UNUSABLE;
2091                 }
2092         }
2093         while ((skb = __skb_dequeue(&entry->skb_list))) {
2094                 skb_put_data(rx->skb, skb->data, skb->len);
2095                 dev_kfree_skb(skb);
2096         }
2097
2098  out:
2099         ieee80211_led_rx(rx->local);
2100  out_no_led:
2101         if (rx->sta)
2102                 rx->sta->rx_stats.packets++;
2103         return RX_CONTINUE;
2104 }
2105
2106 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2107 {
2108         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2109                 return -EACCES;
2110
2111         return 0;
2112 }
2113
2114 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2115 {
2116         struct sk_buff *skb = rx->skb;
2117         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2118
2119         /*
2120          * Pass through unencrypted frames if the hardware has
2121          * decrypted them already.
2122          */
2123         if (status->flag & RX_FLAG_DECRYPTED)
2124                 return 0;
2125
2126         /* Drop unencrypted frames if key is set. */
2127         if (unlikely(!ieee80211_has_protected(fc) &&
2128                      !ieee80211_is_nullfunc(fc) &&
2129                      ieee80211_is_data(fc) && rx->key))
2130                 return -EACCES;
2131
2132         return 0;
2133 }
2134
2135 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2136 {
2137         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2138         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2139         __le16 fc = hdr->frame_control;
2140
2141         /*
2142          * Pass through unencrypted frames if the hardware has
2143          * decrypted them already.
2144          */
2145         if (status->flag & RX_FLAG_DECRYPTED)
2146                 return 0;
2147
2148         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2149                 if (unlikely(!ieee80211_has_protected(fc) &&
2150                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2151                              rx->key)) {
2152                         if (ieee80211_is_deauth(fc) ||
2153                             ieee80211_is_disassoc(fc))
2154                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2155                                                              rx->skb->data,
2156                                                              rx->skb->len);
2157                         return -EACCES;
2158                 }
2159                 /* BIP does not use Protected field, so need to check MMIE */
2160                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2161                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2162                         if (ieee80211_is_deauth(fc) ||
2163                             ieee80211_is_disassoc(fc))
2164                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2165                                                              rx->skb->data,
2166                                                              rx->skb->len);
2167                         return -EACCES;
2168                 }
2169                 /*
2170                  * When using MFP, Action frames are not allowed prior to
2171                  * having configured keys.
2172                  */
2173                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2174                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2175                         return -EACCES;
2176         }
2177
2178         return 0;
2179 }
2180
2181 static int
2182 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2183 {
2184         struct ieee80211_sub_if_data *sdata = rx->sdata;
2185         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2186         bool check_port_control = false;
2187         struct ethhdr *ehdr;
2188         int ret;
2189
2190         *port_control = false;
2191         if (ieee80211_has_a4(hdr->frame_control) &&
2192             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2193                 return -1;
2194
2195         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2196             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2197
2198                 if (!sdata->u.mgd.use_4addr)
2199                         return -1;
2200                 else
2201                         check_port_control = true;
2202         }
2203
2204         if (is_multicast_ether_addr(hdr->addr1) &&
2205             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2206                 return -1;
2207
2208         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2209         if (ret < 0)
2210                 return ret;
2211
2212         ehdr = (struct ethhdr *) rx->skb->data;
2213         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2214                 *port_control = true;
2215         else if (check_port_control)
2216                 return -1;
2217
2218         return 0;
2219 }
2220
2221 /*
2222  * requires that rx->skb is a frame with ethernet header
2223  */
2224 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2225 {
2226         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2227                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2228         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2229
2230         /*
2231          * Allow EAPOL frames to us/the PAE group address regardless
2232          * of whether the frame was encrypted or not.
2233          */
2234         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2235             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2236              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2237                 return true;
2238
2239         if (ieee80211_802_1x_port_control(rx) ||
2240             ieee80211_drop_unencrypted(rx, fc))
2241                 return false;
2242
2243         return true;
2244 }
2245
2246 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2247                                                  struct ieee80211_rx_data *rx)
2248 {
2249         struct ieee80211_sub_if_data *sdata = rx->sdata;
2250         struct net_device *dev = sdata->dev;
2251
2252         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2253                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2254                      sdata->control_port_over_nl80211)) {
2255                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2256                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2257                 struct ethhdr *ehdr = eth_hdr(skb);
2258
2259                 cfg80211_rx_control_port(dev, skb->data, skb->len,
2260                                          ehdr->h_source,
2261                                          be16_to_cpu(skb->protocol), noencrypt);
2262                 dev_kfree_skb(skb);
2263         } else {
2264                 /* deliver to local stack */
2265                 if (rx->napi)
2266                         napi_gro_receive(rx->napi, skb);
2267                 else
2268                         netif_receive_skb(skb);
2269         }
2270 }
2271
2272 /*
2273  * requires that rx->skb is a frame with ethernet header
2274  */
2275 static void
2276 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2277 {
2278         struct ieee80211_sub_if_data *sdata = rx->sdata;
2279         struct net_device *dev = sdata->dev;
2280         struct sk_buff *skb, *xmit_skb;
2281         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2282         struct sta_info *dsta;
2283
2284         skb = rx->skb;
2285         xmit_skb = NULL;
2286
2287         ieee80211_rx_stats(dev, skb->len);
2288
2289         if (rx->sta) {
2290                 /* The seqno index has the same property as needed
2291                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2292                  * for non-QoS-data frames. Here we know it's a data
2293                  * frame, so count MSDUs.
2294                  */
2295                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2296                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2297                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2298         }
2299
2300         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2301              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2302             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2303             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2304                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2305                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2306                         /*
2307                          * send multicast frames both to higher layers in
2308                          * local net stack and back to the wireless medium
2309                          */
2310                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2311                         if (!xmit_skb)
2312                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2313                                                     dev->name);
2314                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2315                         dsta = sta_info_get(sdata, skb->data);
2316                         if (dsta) {
2317                                 /*
2318                                  * The destination station is associated to
2319                                  * this AP (in this VLAN), so send the frame
2320                                  * directly to it and do not pass it to local
2321                                  * net stack.
2322                                  */
2323                                 xmit_skb = skb;
2324                                 skb = NULL;
2325                         }
2326                 }
2327         }
2328
2329 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2330         if (skb) {
2331                 /* 'align' will only take the values 0 or 2 here since all
2332                  * frames are required to be aligned to 2-byte boundaries
2333                  * when being passed to mac80211; the code here works just
2334                  * as well if that isn't true, but mac80211 assumes it can
2335                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2336                  */
2337                 int align;
2338
2339                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2340                 if (align) {
2341                         if (WARN_ON(skb_headroom(skb) < 3)) {
2342                                 dev_kfree_skb(skb);
2343                                 skb = NULL;
2344                         } else {
2345                                 u8 *data = skb->data;
2346                                 size_t len = skb_headlen(skb);
2347                                 skb->data -= align;
2348                                 memmove(skb->data, data, len);
2349                                 skb_set_tail_pointer(skb, len);
2350                         }
2351                 }
2352         }
2353 #endif
2354
2355         if (skb) {
2356                 skb->protocol = eth_type_trans(skb, dev);
2357                 memset(skb->cb, 0, sizeof(skb->cb));
2358
2359                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2360         }
2361
2362         if (xmit_skb) {
2363                 /*
2364                  * Send to wireless media and increase priority by 256 to
2365                  * keep the received priority instead of reclassifying
2366                  * the frame (see cfg80211_classify8021d).
2367                  */
2368                 xmit_skb->priority += 256;
2369                 xmit_skb->protocol = htons(ETH_P_802_3);
2370                 skb_reset_network_header(xmit_skb);
2371                 skb_reset_mac_header(xmit_skb);
2372                 dev_queue_xmit(xmit_skb);
2373         }
2374 }
2375
2376 static ieee80211_rx_result debug_noinline
2377 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2378 {
2379         struct net_device *dev = rx->sdata->dev;
2380         struct sk_buff *skb = rx->skb;
2381         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2382         __le16 fc = hdr->frame_control;
2383         struct sk_buff_head frame_list;
2384         struct ethhdr ethhdr;
2385         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2386
2387         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2388                 check_da = NULL;
2389                 check_sa = NULL;
2390         } else switch (rx->sdata->vif.type) {
2391                 case NL80211_IFTYPE_AP:
2392                 case NL80211_IFTYPE_AP_VLAN:
2393                         check_da = NULL;
2394                         break;
2395                 case NL80211_IFTYPE_STATION:
2396                         if (!rx->sta ||
2397                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2398                                 check_sa = NULL;
2399                         break;
2400                 case NL80211_IFTYPE_MESH_POINT:
2401                         check_sa = NULL;
2402                         break;
2403                 default:
2404                         break;
2405         }
2406
2407         skb->dev = dev;
2408         __skb_queue_head_init(&frame_list);
2409
2410         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2411                                           rx->sdata->vif.addr,
2412                                           rx->sdata->vif.type,
2413                                           data_offset))
2414                 return RX_DROP_UNUSABLE;
2415
2416         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2417                                  rx->sdata->vif.type,
2418                                  rx->local->hw.extra_tx_headroom,
2419                                  check_da, check_sa);
2420
2421         while (!skb_queue_empty(&frame_list)) {
2422                 rx->skb = __skb_dequeue(&frame_list);
2423
2424                 if (!ieee80211_frame_allowed(rx, fc)) {
2425                         dev_kfree_skb(rx->skb);
2426                         continue;
2427                 }
2428
2429                 ieee80211_deliver_skb(rx);
2430         }
2431
2432         return RX_QUEUED;
2433 }
2434
2435 static ieee80211_rx_result debug_noinline
2436 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2437 {
2438         struct sk_buff *skb = rx->skb;
2439         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2440         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2441         __le16 fc = hdr->frame_control;
2442
2443         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2444                 return RX_CONTINUE;
2445
2446         if (unlikely(!ieee80211_is_data(fc)))
2447                 return RX_CONTINUE;
2448
2449         if (unlikely(!ieee80211_is_data_present(fc)))
2450                 return RX_DROP_MONITOR;
2451
2452         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2453                 switch (rx->sdata->vif.type) {
2454                 case NL80211_IFTYPE_AP_VLAN:
2455                         if (!rx->sdata->u.vlan.sta)
2456                                 return RX_DROP_UNUSABLE;
2457                         break;
2458                 case NL80211_IFTYPE_STATION:
2459                         if (!rx->sdata->u.mgd.use_4addr)
2460                                 return RX_DROP_UNUSABLE;
2461                         break;
2462                 default:
2463                         return RX_DROP_UNUSABLE;
2464                 }
2465         }
2466
2467         if (is_multicast_ether_addr(hdr->addr1))
2468                 return RX_DROP_UNUSABLE;
2469
2470         return __ieee80211_rx_h_amsdu(rx, 0);
2471 }
2472
2473 #ifdef CONFIG_MAC80211_MESH
2474 static ieee80211_rx_result
2475 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2476 {
2477         struct ieee80211_hdr *fwd_hdr, *hdr;
2478         struct ieee80211_tx_info *info;
2479         struct ieee80211s_hdr *mesh_hdr;
2480         struct sk_buff *skb = rx->skb, *fwd_skb;
2481         struct ieee80211_local *local = rx->local;
2482         struct ieee80211_sub_if_data *sdata = rx->sdata;
2483         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2484         u16 ac, q, hdrlen;
2485
2486         hdr = (struct ieee80211_hdr *) skb->data;
2487         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2488
2489         /* make sure fixed part of mesh header is there, also checks skb len */
2490         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2491                 return RX_DROP_MONITOR;
2492
2493         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2494
2495         /* make sure full mesh header is there, also checks skb len */
2496         if (!pskb_may_pull(rx->skb,
2497                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2498                 return RX_DROP_MONITOR;
2499
2500         /* reload pointers */
2501         hdr = (struct ieee80211_hdr *) skb->data;
2502         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2503
2504         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2505                 return RX_DROP_MONITOR;
2506
2507         /* frame is in RMC, don't forward */
2508         if (ieee80211_is_data(hdr->frame_control) &&
2509             is_multicast_ether_addr(hdr->addr1) &&
2510             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2511                 return RX_DROP_MONITOR;
2512
2513         if (!ieee80211_is_data(hdr->frame_control))
2514                 return RX_CONTINUE;
2515
2516         if (!mesh_hdr->ttl)
2517                 return RX_DROP_MONITOR;
2518
2519         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2520                 struct mesh_path *mppath;
2521                 char *proxied_addr;
2522                 char *mpp_addr;
2523
2524                 if (is_multicast_ether_addr(hdr->addr1)) {
2525                         mpp_addr = hdr->addr3;
2526                         proxied_addr = mesh_hdr->eaddr1;
2527                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2528                             MESH_FLAGS_AE_A5_A6) {
2529                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2530                         mpp_addr = hdr->addr4;
2531                         proxied_addr = mesh_hdr->eaddr2;
2532                 } else {
2533                         return RX_DROP_MONITOR;
2534                 }
2535
2536                 rcu_read_lock();
2537                 mppath = mpp_path_lookup(sdata, proxied_addr);
2538                 if (!mppath) {
2539                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2540                 } else {
2541                         spin_lock_bh(&mppath->state_lock);
2542                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2543                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2544                         mppath->exp_time = jiffies;
2545                         spin_unlock_bh(&mppath->state_lock);
2546                 }
2547                 rcu_read_unlock();
2548         }
2549
2550         /* Frame has reached destination.  Don't forward */
2551         if (!is_multicast_ether_addr(hdr->addr1) &&
2552             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2553                 return RX_CONTINUE;
2554
2555         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2556         q = sdata->vif.hw_queue[ac];
2557         if (ieee80211_queue_stopped(&local->hw, q)) {
2558                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2559                 return RX_DROP_MONITOR;
2560         }
2561         skb_set_queue_mapping(skb, q);
2562
2563         if (!--mesh_hdr->ttl) {
2564                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2565                 goto out;
2566         }
2567
2568         if (!ifmsh->mshcfg.dot11MeshForwarding)
2569                 goto out;
2570
2571         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2572                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2573         if (!fwd_skb)
2574                 goto out;
2575
2576         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2577         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2578         info = IEEE80211_SKB_CB(fwd_skb);
2579         memset(info, 0, sizeof(*info));
2580         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2581         info->control.vif = &rx->sdata->vif;
2582         info->control.jiffies = jiffies;
2583         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2584                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2585                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2586                 /* update power mode indication when forwarding */
2587                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2588         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2589                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2590                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2591         } else {
2592                 /* unable to resolve next hop */
2593                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2594                                    fwd_hdr->addr3, 0,
2595                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2596                                    fwd_hdr->addr2);
2597                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2598                 kfree_skb(fwd_skb);
2599                 return RX_DROP_MONITOR;
2600         }
2601
2602         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2603         ieee80211_add_pending_skb(local, fwd_skb);
2604  out:
2605         if (is_multicast_ether_addr(hdr->addr1))
2606                 return RX_CONTINUE;
2607         return RX_DROP_MONITOR;
2608 }
2609 #endif
2610
2611 static ieee80211_rx_result debug_noinline
2612 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2613 {
2614         struct ieee80211_sub_if_data *sdata = rx->sdata;
2615         struct ieee80211_local *local = rx->local;
2616         struct net_device *dev = sdata->dev;
2617         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2618         __le16 fc = hdr->frame_control;
2619         bool port_control;
2620         int err;
2621
2622         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2623                 return RX_CONTINUE;
2624
2625         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2626                 return RX_DROP_MONITOR;
2627
2628         /*
2629          * Send unexpected-4addr-frame event to hostapd. For older versions,
2630          * also drop the frame to cooked monitor interfaces.
2631          */
2632         if (ieee80211_has_a4(hdr->frame_control) &&
2633             sdata->vif.type == NL80211_IFTYPE_AP) {
2634                 if (rx->sta &&
2635                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2636                         cfg80211_rx_unexpected_4addr_frame(
2637                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2638                 return RX_DROP_MONITOR;
2639         }
2640
2641         err = __ieee80211_data_to_8023(rx, &port_control);
2642         if (unlikely(err))
2643                 return RX_DROP_UNUSABLE;
2644
2645         if (!ieee80211_frame_allowed(rx, fc))
2646                 return RX_DROP_MONITOR;
2647
2648         /* directly handle TDLS channel switch requests/responses */
2649         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2650                                                 cpu_to_be16(ETH_P_TDLS))) {
2651                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2652
2653                 if (pskb_may_pull(rx->skb,
2654                                   offsetof(struct ieee80211_tdls_data, u)) &&
2655                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2656                     tf->category == WLAN_CATEGORY_TDLS &&
2657                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2658                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2659                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2660                         schedule_work(&local->tdls_chsw_work);
2661                         if (rx->sta)
2662                                 rx->sta->rx_stats.packets++;
2663
2664                         return RX_QUEUED;
2665                 }
2666         }
2667
2668         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2669             unlikely(port_control) && sdata->bss) {
2670                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2671                                      u.ap);
2672                 dev = sdata->dev;
2673                 rx->sdata = sdata;
2674         }
2675
2676         rx->skb->dev = dev;
2677
2678         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2679             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2680             !is_multicast_ether_addr(
2681                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2682             (!local->scanning &&
2683              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2684                 mod_timer(&local->dynamic_ps_timer, jiffies +
2685                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2686
2687         ieee80211_deliver_skb(rx);
2688
2689         return RX_QUEUED;
2690 }
2691
2692 static ieee80211_rx_result debug_noinline
2693 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2694 {
2695         struct sk_buff *skb = rx->skb;
2696         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2697         struct tid_ampdu_rx *tid_agg_rx;
2698         u16 start_seq_num;
2699         u16 tid;
2700
2701         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2702                 return RX_CONTINUE;
2703
2704         if (ieee80211_is_back_req(bar->frame_control)) {
2705                 struct {
2706                         __le16 control, start_seq_num;
2707                 } __packed bar_data;
2708                 struct ieee80211_event event = {
2709                         .type = BAR_RX_EVENT,
2710                 };
2711
2712                 if (!rx->sta)
2713                         return RX_DROP_MONITOR;
2714
2715                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2716                                   &bar_data, sizeof(bar_data)))
2717                         return RX_DROP_MONITOR;
2718
2719                 tid = le16_to_cpu(bar_data.control) >> 12;
2720
2721                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2722                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2723                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2724                                              WLAN_BACK_RECIPIENT,
2725                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2726
2727                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2728                 if (!tid_agg_rx)
2729                         return RX_DROP_MONITOR;
2730
2731                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2732                 event.u.ba.tid = tid;
2733                 event.u.ba.ssn = start_seq_num;
2734                 event.u.ba.sta = &rx->sta->sta;
2735
2736                 /* reset session timer */
2737                 if (tid_agg_rx->timeout)
2738                         mod_timer(&tid_agg_rx->session_timer,
2739                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2740
2741                 spin_lock(&tid_agg_rx->reorder_lock);
2742                 /* release stored frames up to start of BAR */
2743                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2744                                                  start_seq_num, frames);
2745                 spin_unlock(&tid_agg_rx->reorder_lock);
2746
2747                 drv_event_callback(rx->local, rx->sdata, &event);
2748
2749                 kfree_skb(skb);
2750                 return RX_QUEUED;
2751         }
2752
2753         /*
2754          * After this point, we only want management frames,
2755          * so we can drop all remaining control frames to
2756          * cooked monitor interfaces.
2757          */
2758         return RX_DROP_MONITOR;
2759 }
2760
2761 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2762                                            struct ieee80211_mgmt *mgmt,
2763                                            size_t len)
2764 {
2765         struct ieee80211_local *local = sdata->local;
2766         struct sk_buff *skb;
2767         struct ieee80211_mgmt *resp;
2768
2769         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2770                 /* Not to own unicast address */
2771                 return;
2772         }
2773
2774         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2775             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2776                 /* Not from the current AP or not associated yet. */
2777                 return;
2778         }
2779
2780         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2781                 /* Too short SA Query request frame */
2782                 return;
2783         }
2784
2785         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2786         if (skb == NULL)
2787                 return;
2788
2789         skb_reserve(skb, local->hw.extra_tx_headroom);
2790         resp = skb_put_zero(skb, 24);
2791         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2792         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2793         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2794         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2795                                           IEEE80211_STYPE_ACTION);
2796         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2797         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2798         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2799         memcpy(resp->u.action.u.sa_query.trans_id,
2800                mgmt->u.action.u.sa_query.trans_id,
2801                WLAN_SA_QUERY_TR_ID_LEN);
2802
2803         ieee80211_tx_skb(sdata, skb);
2804 }
2805
2806 static ieee80211_rx_result debug_noinline
2807 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2808 {
2809         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2810         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2811
2812         /*
2813          * From here on, look only at management frames.
2814          * Data and control frames are already handled,
2815          * and unknown (reserved) frames are useless.
2816          */
2817         if (rx->skb->len < 24)
2818                 return RX_DROP_MONITOR;
2819
2820         if (!ieee80211_is_mgmt(mgmt->frame_control))
2821                 return RX_DROP_MONITOR;
2822
2823         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2824             ieee80211_is_beacon(mgmt->frame_control) &&
2825             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2826                 int sig = 0;
2827
2828                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2829                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2830                         sig = status->signal;
2831
2832                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2833                                             rx->skb->data, rx->skb->len,
2834                                             status->freq, sig);
2835                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2836         }
2837
2838         if (ieee80211_drop_unencrypted_mgmt(rx))
2839                 return RX_DROP_UNUSABLE;
2840
2841         return RX_CONTINUE;
2842 }
2843
2844 static ieee80211_rx_result debug_noinline
2845 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2846 {
2847         struct ieee80211_local *local = rx->local;
2848         struct ieee80211_sub_if_data *sdata = rx->sdata;
2849         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2850         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2851         int len = rx->skb->len;
2852
2853         if (!ieee80211_is_action(mgmt->frame_control))
2854                 return RX_CONTINUE;
2855
2856         /* drop too small frames */
2857         if (len < IEEE80211_MIN_ACTION_SIZE)
2858                 return RX_DROP_UNUSABLE;
2859
2860         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2861             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2862             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2863                 return RX_DROP_UNUSABLE;
2864
2865         switch (mgmt->u.action.category) {
2866         case WLAN_CATEGORY_HT:
2867                 /* reject HT action frames from stations not supporting HT */
2868                 if (!rx->sta->sta.ht_cap.ht_supported)
2869                         goto invalid;
2870
2871                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2872                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2873                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2874                     sdata->vif.type != NL80211_IFTYPE_AP &&
2875                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2876                         break;
2877
2878                 /* verify action & smps_control/chanwidth are present */
2879                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2880                         goto invalid;
2881
2882                 switch (mgmt->u.action.u.ht_smps.action) {
2883                 case WLAN_HT_ACTION_SMPS: {
2884                         struct ieee80211_supported_band *sband;
2885                         enum ieee80211_smps_mode smps_mode;
2886                         struct sta_opmode_info sta_opmode = {};
2887
2888                         /* convert to HT capability */
2889                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2890                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2891                                 smps_mode = IEEE80211_SMPS_OFF;
2892                                 break;
2893                         case WLAN_HT_SMPS_CONTROL_STATIC:
2894                                 smps_mode = IEEE80211_SMPS_STATIC;
2895                                 break;
2896                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2897                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2898                                 break;
2899                         default:
2900                                 goto invalid;
2901                         }
2902
2903                         /* if no change do nothing */
2904                         if (rx->sta->sta.smps_mode == smps_mode)
2905                                 goto handled;
2906                         rx->sta->sta.smps_mode = smps_mode;
2907                         sta_opmode.smps_mode =
2908                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
2909                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
2910
2911                         sband = rx->local->hw.wiphy->bands[status->band];
2912
2913                         rate_control_rate_update(local, sband, rx->sta,
2914                                                  IEEE80211_RC_SMPS_CHANGED);
2915                         cfg80211_sta_opmode_change_notify(sdata->dev,
2916                                                           rx->sta->addr,
2917                                                           &sta_opmode,
2918                                                           GFP_KERNEL);
2919                         goto handled;
2920                 }
2921                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2922                         struct ieee80211_supported_band *sband;
2923                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2924                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2925                         struct sta_opmode_info sta_opmode = {};
2926
2927                         /* If it doesn't support 40 MHz it can't change ... */
2928                         if (!(rx->sta->sta.ht_cap.cap &
2929                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2930                                 goto handled;
2931
2932                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2933                                 max_bw = IEEE80211_STA_RX_BW_20;
2934                         else
2935                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2936
2937                         /* set cur_max_bandwidth and recalc sta bw */
2938                         rx->sta->cur_max_bandwidth = max_bw;
2939                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2940
2941                         if (rx->sta->sta.bandwidth == new_bw)
2942                                 goto handled;
2943
2944                         rx->sta->sta.bandwidth = new_bw;
2945                         sband = rx->local->hw.wiphy->bands[status->band];
2946                         sta_opmode.bw =
2947                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
2948                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
2949
2950                         rate_control_rate_update(local, sband, rx->sta,
2951                                                  IEEE80211_RC_BW_CHANGED);
2952                         cfg80211_sta_opmode_change_notify(sdata->dev,
2953                                                           rx->sta->addr,
2954                                                           &sta_opmode,
2955                                                           GFP_KERNEL);
2956                         goto handled;
2957                 }
2958                 default:
2959                         goto invalid;
2960                 }
2961
2962                 break;
2963         case WLAN_CATEGORY_PUBLIC:
2964                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2965                         goto invalid;
2966                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2967                         break;
2968                 if (!rx->sta)
2969                         break;
2970                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2971                         break;
2972                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2973                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2974                         break;
2975                 if (len < offsetof(struct ieee80211_mgmt,
2976                                    u.action.u.ext_chan_switch.variable))
2977                         goto invalid;
2978                 goto queue;
2979         case WLAN_CATEGORY_VHT:
2980                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2981                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2982                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2983                     sdata->vif.type != NL80211_IFTYPE_AP &&
2984                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2985                         break;
2986
2987                 /* verify action code is present */
2988                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2989                         goto invalid;
2990
2991                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2992                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2993                         /* verify opmode is present */
2994                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2995                                 goto invalid;
2996                         goto queue;
2997                 }
2998                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2999                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3000                                 goto invalid;
3001                         goto queue;
3002                 }
3003                 default:
3004                         break;
3005                 }
3006                 break;
3007         case WLAN_CATEGORY_BACK:
3008                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3009                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3010                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3011                     sdata->vif.type != NL80211_IFTYPE_AP &&
3012                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3013                         break;
3014
3015                 /* verify action_code is present */
3016                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3017                         break;
3018
3019                 switch (mgmt->u.action.u.addba_req.action_code) {
3020                 case WLAN_ACTION_ADDBA_REQ:
3021                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3022                                    sizeof(mgmt->u.action.u.addba_req)))
3023                                 goto invalid;
3024                         break;
3025                 case WLAN_ACTION_ADDBA_RESP:
3026                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3027                                    sizeof(mgmt->u.action.u.addba_resp)))
3028                                 goto invalid;
3029                         break;
3030                 case WLAN_ACTION_DELBA:
3031                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3032                                    sizeof(mgmt->u.action.u.delba)))
3033                                 goto invalid;
3034                         break;
3035                 default:
3036                         goto invalid;
3037                 }
3038
3039                 goto queue;
3040         case WLAN_CATEGORY_SPECTRUM_MGMT:
3041                 /* verify action_code is present */
3042                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3043                         break;
3044
3045                 switch (mgmt->u.action.u.measurement.action_code) {
3046                 case WLAN_ACTION_SPCT_MSR_REQ:
3047                         if (status->band != NL80211_BAND_5GHZ)
3048                                 break;
3049
3050                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3051                                    sizeof(mgmt->u.action.u.measurement)))
3052                                 break;
3053
3054                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3055                                 break;
3056
3057                         ieee80211_process_measurement_req(sdata, mgmt, len);
3058                         goto handled;
3059                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3060                         u8 *bssid;
3061                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3062                                    sizeof(mgmt->u.action.u.chan_switch)))
3063                                 break;
3064
3065                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3066                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3067                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3068                                 break;
3069
3070                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3071                                 bssid = sdata->u.mgd.bssid;
3072                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3073                                 bssid = sdata->u.ibss.bssid;
3074                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3075                                 bssid = mgmt->sa;
3076                         else
3077                                 break;
3078
3079                         if (!ether_addr_equal(mgmt->bssid, bssid))
3080                                 break;
3081
3082                         goto queue;
3083                         }
3084                 }
3085                 break;
3086         case WLAN_CATEGORY_SA_QUERY:
3087                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3088                            sizeof(mgmt->u.action.u.sa_query)))
3089                         break;
3090
3091                 switch (mgmt->u.action.u.sa_query.action) {
3092                 case WLAN_ACTION_SA_QUERY_REQUEST:
3093                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3094                                 break;
3095                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3096                         goto handled;
3097                 }
3098                 break;
3099         case WLAN_CATEGORY_SELF_PROTECTED:
3100                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3101                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3102                         break;
3103
3104                 switch (mgmt->u.action.u.self_prot.action_code) {
3105                 case WLAN_SP_MESH_PEERING_OPEN:
3106                 case WLAN_SP_MESH_PEERING_CLOSE:
3107                 case WLAN_SP_MESH_PEERING_CONFIRM:
3108                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3109                                 goto invalid;
3110                         if (sdata->u.mesh.user_mpm)
3111                                 /* userspace handles this frame */
3112                                 break;
3113                         goto queue;
3114                 case WLAN_SP_MGK_INFORM:
3115                 case WLAN_SP_MGK_ACK:
3116                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3117                                 goto invalid;
3118                         break;
3119                 }
3120                 break;
3121         case WLAN_CATEGORY_MESH_ACTION:
3122                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3123                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3124                         break;
3125
3126                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3127                         break;
3128                 if (mesh_action_is_path_sel(mgmt) &&
3129                     !mesh_path_sel_is_hwmp(sdata))
3130                         break;
3131                 goto queue;
3132         }
3133
3134         return RX_CONTINUE;
3135
3136  invalid:
3137         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3138         /* will return in the next handlers */
3139         return RX_CONTINUE;
3140
3141  handled:
3142         if (rx->sta)
3143                 rx->sta->rx_stats.packets++;
3144         dev_kfree_skb(rx->skb);
3145         return RX_QUEUED;
3146
3147  queue:
3148         skb_queue_tail(&sdata->skb_queue, rx->skb);
3149         ieee80211_queue_work(&local->hw, &sdata->work);
3150         if (rx->sta)
3151                 rx->sta->rx_stats.packets++;
3152         return RX_QUEUED;
3153 }
3154
3155 static ieee80211_rx_result debug_noinline
3156 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3157 {
3158         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3159         int sig = 0;
3160
3161         /* skip known-bad action frames and return them in the next handler */
3162         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3163                 return RX_CONTINUE;
3164
3165         /*
3166          * Getting here means the kernel doesn't know how to handle
3167          * it, but maybe userspace does ... include returned frames
3168          * so userspace can register for those to know whether ones
3169          * it transmitted were processed or returned.
3170          */
3171
3172         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3173             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3174                 sig = status->signal;
3175
3176         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3177                              rx->skb->data, rx->skb->len, 0)) {
3178                 if (rx->sta)
3179                         rx->sta->rx_stats.packets++;
3180                 dev_kfree_skb(rx->skb);
3181                 return RX_QUEUED;
3182         }
3183
3184         return RX_CONTINUE;
3185 }
3186
3187 static ieee80211_rx_result debug_noinline
3188 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3189 {
3190         struct ieee80211_local *local = rx->local;
3191         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3192         struct sk_buff *nskb;
3193         struct ieee80211_sub_if_data *sdata = rx->sdata;
3194         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3195
3196         if (!ieee80211_is_action(mgmt->frame_control))
3197                 return RX_CONTINUE;
3198
3199         /*
3200          * For AP mode, hostapd is responsible for handling any action
3201          * frames that we didn't handle, including returning unknown
3202          * ones. For all other modes we will return them to the sender,
3203          * setting the 0x80 bit in the action category, as required by
3204          * 802.11-2012 9.24.4.
3205          * Newer versions of hostapd shall also use the management frame
3206          * registration mechanisms, but older ones still use cooked
3207          * monitor interfaces so push all frames there.
3208          */
3209         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3210             (sdata->vif.type == NL80211_IFTYPE_AP ||
3211              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3212                 return RX_DROP_MONITOR;
3213
3214         if (is_multicast_ether_addr(mgmt->da))
3215                 return RX_DROP_MONITOR;
3216
3217         /* do not return rejected action frames */
3218         if (mgmt->u.action.category & 0x80)
3219                 return RX_DROP_UNUSABLE;
3220
3221         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3222                                GFP_ATOMIC);
3223         if (nskb) {
3224                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3225
3226                 nmgmt->u.action.category |= 0x80;
3227                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3228                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3229
3230                 memset(nskb->cb, 0, sizeof(nskb->cb));
3231
3232                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3233                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3234
3235                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3236                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3237                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3238                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3239                                 info->hw_queue =
3240                                         local->hw.offchannel_tx_hw_queue;
3241                 }
3242
3243                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3244                                             status->band);
3245         }
3246         dev_kfree_skb(rx->skb);
3247         return RX_QUEUED;
3248 }
3249
3250 static ieee80211_rx_result debug_noinline
3251 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3252 {
3253         struct ieee80211_sub_if_data *sdata = rx->sdata;
3254         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3255         __le16 stype;
3256
3257         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3258
3259         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3260             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3261             sdata->vif.type != NL80211_IFTYPE_OCB &&
3262             sdata->vif.type != NL80211_IFTYPE_STATION)
3263                 return RX_DROP_MONITOR;
3264
3265         switch (stype) {
3266         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3267         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3268         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3269                 /* process for all: mesh, mlme, ibss */
3270                 break;
3271         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3272         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3273         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3274         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3275                 if (is_multicast_ether_addr(mgmt->da) &&
3276                     !is_broadcast_ether_addr(mgmt->da))
3277                         return RX_DROP_MONITOR;
3278
3279                 /* process only for station */
3280                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3281                         return RX_DROP_MONITOR;
3282                 break;
3283         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3284                 /* process only for ibss and mesh */
3285                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3286                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3287                         return RX_DROP_MONITOR;
3288                 break;
3289         default:
3290                 return RX_DROP_MONITOR;
3291         }
3292
3293         /* queue up frame and kick off work to process it */
3294         skb_queue_tail(&sdata->skb_queue, rx->skb);
3295         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3296         if (rx->sta)
3297                 rx->sta->rx_stats.packets++;
3298
3299         return RX_QUEUED;
3300 }
3301
3302 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3303                                         struct ieee80211_rate *rate)
3304 {
3305         struct ieee80211_sub_if_data *sdata;
3306         struct ieee80211_local *local = rx->local;
3307         struct sk_buff *skb = rx->skb, *skb2;
3308         struct net_device *prev_dev = NULL;
3309         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3310         int needed_headroom;
3311
3312         /*
3313          * If cooked monitor has been processed already, then
3314          * don't do it again. If not, set the flag.
3315          */
3316         if (rx->flags & IEEE80211_RX_CMNTR)
3317                 goto out_free_skb;
3318         rx->flags |= IEEE80211_RX_CMNTR;
3319
3320         /* If there are no cooked monitor interfaces, just free the SKB */
3321         if (!local->cooked_mntrs)
3322                 goto out_free_skb;
3323
3324         /* vendor data is long removed here */
3325         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3326         /* room for the radiotap header based on driver features */
3327         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3328
3329         if (skb_headroom(skb) < needed_headroom &&
3330             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3331                 goto out_free_skb;
3332
3333         /* prepend radiotap information */
3334         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3335                                          false);
3336
3337         skb_reset_mac_header(skb);
3338         skb->ip_summed = CHECKSUM_UNNECESSARY;
3339         skb->pkt_type = PACKET_OTHERHOST;
3340         skb->protocol = htons(ETH_P_802_2);
3341
3342         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3343                 if (!ieee80211_sdata_running(sdata))
3344                         continue;
3345
3346                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3347                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3348                         continue;
3349
3350                 if (prev_dev) {
3351                         skb2 = skb_clone(skb, GFP_ATOMIC);
3352                         if (skb2) {
3353                                 skb2->dev = prev_dev;
3354                                 netif_receive_skb(skb2);
3355                         }
3356                 }
3357
3358                 prev_dev = sdata->dev;
3359                 ieee80211_rx_stats(sdata->dev, skb->len);
3360         }
3361
3362         if (prev_dev) {
3363                 skb->dev = prev_dev;
3364                 netif_receive_skb(skb);
3365                 return;
3366         }
3367
3368  out_free_skb:
3369         dev_kfree_skb(skb);
3370 }
3371
3372 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3373                                          ieee80211_rx_result res)
3374 {
3375         switch (res) {
3376         case RX_DROP_MONITOR:
3377                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3378                 if (rx->sta)
3379                         rx->sta->rx_stats.dropped++;
3380                 /* fall through */
3381         case RX_CONTINUE: {
3382                 struct ieee80211_rate *rate = NULL;
3383                 struct ieee80211_supported_band *sband;
3384                 struct ieee80211_rx_status *status;
3385
3386                 status = IEEE80211_SKB_RXCB((rx->skb));
3387
3388                 sband = rx->local->hw.wiphy->bands[status->band];
3389                 if (!(status->encoding == RX_ENC_HT) &&
3390                     !(status->encoding == RX_ENC_VHT))
3391                         rate = &sband->bitrates[status->rate_idx];
3392
3393                 ieee80211_rx_cooked_monitor(rx, rate);
3394                 break;
3395                 }
3396         case RX_DROP_UNUSABLE:
3397                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3398                 if (rx->sta)
3399                         rx->sta->rx_stats.dropped++;
3400                 dev_kfree_skb(rx->skb);
3401                 break;
3402         case RX_QUEUED:
3403                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3404                 break;
3405         }
3406 }
3407
3408 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3409                                   struct sk_buff_head *frames)
3410 {
3411         ieee80211_rx_result res = RX_DROP_MONITOR;
3412         struct sk_buff *skb;
3413
3414 #define CALL_RXH(rxh)                   \
3415         do {                            \
3416                 res = rxh(rx);          \
3417                 if (res != RX_CONTINUE) \
3418                         goto rxh_next;  \
3419         } while (0)
3420
3421         /* Lock here to avoid hitting all of the data used in the RX
3422          * path (e.g. key data, station data, ...) concurrently when
3423          * a frame is released from the reorder buffer due to timeout
3424          * from the timer, potentially concurrently with RX from the
3425          * driver.
3426          */
3427         spin_lock_bh(&rx->local->rx_path_lock);
3428
3429         while ((skb = __skb_dequeue(frames))) {
3430                 /*
3431                  * all the other fields are valid across frames
3432                  * that belong to an aMPDU since they are on the
3433                  * same TID from the same station
3434                  */
3435                 rx->skb = skb;
3436
3437                 CALL_RXH(ieee80211_rx_h_check_more_data);
3438                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3439                 CALL_RXH(ieee80211_rx_h_sta_process);
3440                 CALL_RXH(ieee80211_rx_h_decrypt);
3441                 CALL_RXH(ieee80211_rx_h_defragment);
3442                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3443                 /* must be after MMIC verify so header is counted in MPDU mic */
3444 #ifdef CONFIG_MAC80211_MESH
3445                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3446                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3447 #endif
3448                 CALL_RXH(ieee80211_rx_h_amsdu);
3449                 CALL_RXH(ieee80211_rx_h_data);
3450
3451                 /* special treatment -- needs the queue */
3452                 res = ieee80211_rx_h_ctrl(rx, frames);
3453                 if (res != RX_CONTINUE)
3454                         goto rxh_next;
3455
3456                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3457                 CALL_RXH(ieee80211_rx_h_action);
3458                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3459                 CALL_RXH(ieee80211_rx_h_action_return);
3460                 CALL_RXH(ieee80211_rx_h_mgmt);
3461
3462  rxh_next:
3463                 ieee80211_rx_handlers_result(rx, res);
3464
3465 #undef CALL_RXH
3466         }
3467
3468         spin_unlock_bh(&rx->local->rx_path_lock);
3469 }
3470
3471 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3472 {
3473         struct sk_buff_head reorder_release;
3474         ieee80211_rx_result res = RX_DROP_MONITOR;
3475
3476         __skb_queue_head_init(&reorder_release);
3477
3478 #define CALL_RXH(rxh)                   \
3479         do {                            \
3480                 res = rxh(rx);          \
3481                 if (res != RX_CONTINUE) \
3482                         goto rxh_next;  \
3483         } while (0)
3484
3485         CALL_RXH(ieee80211_rx_h_check_dup);
3486         CALL_RXH(ieee80211_rx_h_check);
3487
3488         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3489
3490         ieee80211_rx_handlers(rx, &reorder_release);
3491         return;
3492
3493  rxh_next:
3494         ieee80211_rx_handlers_result(rx, res);
3495
3496 #undef CALL_RXH
3497 }
3498
3499 /*
3500  * This function makes calls into the RX path, therefore
3501  * it has to be invoked under RCU read lock.
3502  */
3503 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3504 {
3505         struct sk_buff_head frames;
3506         struct ieee80211_rx_data rx = {
3507                 .sta = sta,
3508                 .sdata = sta->sdata,
3509                 .local = sta->local,
3510                 /* This is OK -- must be QoS data frame */
3511                 .security_idx = tid,
3512                 .seqno_idx = tid,
3513                 .napi = NULL, /* must be NULL to not have races */
3514         };
3515         struct tid_ampdu_rx *tid_agg_rx;
3516
3517         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3518         if (!tid_agg_rx)
3519                 return;
3520
3521         __skb_queue_head_init(&frames);
3522
3523         spin_lock(&tid_agg_rx->reorder_lock);
3524         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3525         spin_unlock(&tid_agg_rx->reorder_lock);
3526
3527         if (!skb_queue_empty(&frames)) {
3528                 struct ieee80211_event event = {
3529                         .type = BA_FRAME_TIMEOUT,
3530                         .u.ba.tid = tid,
3531                         .u.ba.sta = &sta->sta,
3532                 };
3533                 drv_event_callback(rx.local, rx.sdata, &event);
3534         }
3535
3536         ieee80211_rx_handlers(&rx, &frames);
3537 }
3538
3539 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3540                                           u16 ssn, u64 filtered,
3541                                           u16 received_mpdus)
3542 {
3543         struct sta_info *sta;
3544         struct tid_ampdu_rx *tid_agg_rx;
3545         struct sk_buff_head frames;
3546         struct ieee80211_rx_data rx = {
3547                 /* This is OK -- must be QoS data frame */
3548                 .security_idx = tid,
3549                 .seqno_idx = tid,
3550         };
3551         int i, diff;
3552
3553         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3554                 return;
3555
3556         __skb_queue_head_init(&frames);
3557
3558         sta = container_of(pubsta, struct sta_info, sta);
3559
3560         rx.sta = sta;
3561         rx.sdata = sta->sdata;
3562         rx.local = sta->local;
3563
3564         rcu_read_lock();
3565         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3566         if (!tid_agg_rx)
3567                 goto out;
3568
3569         spin_lock_bh(&tid_agg_rx->reorder_lock);
3570
3571         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3572                 int release;
3573
3574                 /* release all frames in the reorder buffer */
3575                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3576                            IEEE80211_SN_MODULO;
3577                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3578                                                  release, &frames);
3579                 /* update ssn to match received ssn */
3580                 tid_agg_rx->head_seq_num = ssn;
3581         } else {
3582                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3583                                                  &frames);
3584         }
3585
3586         /* handle the case that received ssn is behind the mac ssn.
3587          * it can be tid_agg_rx->buf_size behind and still be valid */
3588         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3589         if (diff >= tid_agg_rx->buf_size) {
3590                 tid_agg_rx->reorder_buf_filtered = 0;
3591                 goto release;
3592         }
3593         filtered = filtered >> diff;
3594         ssn += diff;
3595
3596         /* update bitmap */
3597         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3598                 int index = (ssn + i) % tid_agg_rx->buf_size;
3599
3600                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3601                 if (filtered & BIT_ULL(i))
3602                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3603         }
3604
3605         /* now process also frames that the filter marking released */
3606         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3607
3608 release:
3609         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3610
3611         ieee80211_rx_handlers(&rx, &frames);
3612
3613  out:
3614         rcu_read_unlock();
3615 }
3616 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3617
3618 /* main receive path */
3619
3620 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3621 {
3622         struct ieee80211_sub_if_data *sdata = rx->sdata;
3623         struct sk_buff *skb = rx->skb;
3624         struct ieee80211_hdr *hdr = (void *)skb->data;
3625         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3626         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3627         bool multicast = is_multicast_ether_addr(hdr->addr1);
3628
3629         switch (sdata->vif.type) {
3630         case NL80211_IFTYPE_STATION:
3631                 if (!bssid && !sdata->u.mgd.use_4addr)
3632                         return false;
3633                 if (multicast)
3634                         return true;
3635                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3636         case NL80211_IFTYPE_ADHOC:
3637                 if (!bssid)
3638                         return false;
3639                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3640                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3641                         return false;
3642                 if (ieee80211_is_beacon(hdr->frame_control))
3643                         return true;
3644                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3645                         return false;
3646                 if (!multicast &&
3647                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3648                         return false;
3649                 if (!rx->sta) {
3650                         int rate_idx;
3651                         if (status->encoding != RX_ENC_LEGACY)
3652                                 rate_idx = 0; /* TODO: HT/VHT rates */
3653                         else
3654                                 rate_idx = status->rate_idx;
3655                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3656                                                  BIT(rate_idx));
3657                 }
3658                 return true;
3659         case NL80211_IFTYPE_OCB:
3660                 if (!bssid)
3661                         return false;
3662                 if (!ieee80211_is_data_present(hdr->frame_control))
3663                         return false;
3664                 if (!is_broadcast_ether_addr(bssid))
3665                         return false;
3666                 if (!multicast &&
3667                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3668                         return false;
3669                 if (!rx->sta) {
3670                         int rate_idx;
3671                         if (status->encoding != RX_ENC_LEGACY)
3672                                 rate_idx = 0; /* TODO: HT rates */
3673                         else
3674                                 rate_idx = status->rate_idx;
3675                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3676                                                 BIT(rate_idx));
3677                 }
3678                 return true;
3679         case NL80211_IFTYPE_MESH_POINT:
3680                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3681                         return false;
3682                 if (multicast)
3683                         return true;
3684                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3685         case NL80211_IFTYPE_AP_VLAN:
3686         case NL80211_IFTYPE_AP:
3687                 if (!bssid)
3688                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3689
3690                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3691                         /*
3692                          * Accept public action frames even when the
3693                          * BSSID doesn't match, this is used for P2P
3694                          * and location updates. Note that mac80211
3695                          * itself never looks at these frames.
3696                          */
3697                         if (!multicast &&
3698                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3699                                 return false;
3700                         if (ieee80211_is_public_action(hdr, skb->len))
3701                                 return true;
3702                         return ieee80211_is_beacon(hdr->frame_control);
3703                 }
3704
3705                 if (!ieee80211_has_tods(hdr->frame_control)) {
3706                         /* ignore data frames to TDLS-peers */
3707                         if (ieee80211_is_data(hdr->frame_control))
3708                                 return false;
3709                         /* ignore action frames to TDLS-peers */
3710                         if (ieee80211_is_action(hdr->frame_control) &&
3711                             !is_broadcast_ether_addr(bssid) &&
3712                             !ether_addr_equal(bssid, hdr->addr1))
3713                                 return false;
3714                 }
3715
3716                 /*
3717                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3718                  * the BSSID - we've checked that already but may have accepted
3719                  * the wildcard (ff:ff:ff:ff:ff:ff).
3720                  *
3721                  * It also says:
3722                  *      The BSSID of the Data frame is determined as follows:
3723                  *      a) If the STA is contained within an AP or is associated
3724                  *         with an AP, the BSSID is the address currently in use
3725                  *         by the STA contained in the AP.
3726                  *
3727                  * So we should not accept data frames with an address that's
3728                  * multicast.
3729                  *
3730                  * Accepting it also opens a security problem because stations
3731                  * could encrypt it with the GTK and inject traffic that way.
3732                  */
3733                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3734                         return false;
3735
3736                 return true;
3737         case NL80211_IFTYPE_WDS:
3738                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3739                         return false;
3740                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3741         case NL80211_IFTYPE_P2P_DEVICE:
3742                 return ieee80211_is_public_action(hdr, skb->len) ||
3743                        ieee80211_is_probe_req(hdr->frame_control) ||
3744                        ieee80211_is_probe_resp(hdr->frame_control) ||
3745                        ieee80211_is_beacon(hdr->frame_control);
3746         case NL80211_IFTYPE_NAN:
3747                 /* Currently no frames on NAN interface are allowed */
3748                 return false;
3749         default:
3750                 break;
3751         }
3752
3753         WARN_ON_ONCE(1);
3754         return false;
3755 }
3756
3757 void ieee80211_check_fast_rx(struct sta_info *sta)
3758 {
3759         struct ieee80211_sub_if_data *sdata = sta->sdata;
3760         struct ieee80211_local *local = sdata->local;
3761         struct ieee80211_key *key;
3762         struct ieee80211_fast_rx fastrx = {
3763                 .dev = sdata->dev,
3764                 .vif_type = sdata->vif.type,
3765                 .control_port_protocol = sdata->control_port_protocol,
3766         }, *old, *new = NULL;
3767         bool assign = false;
3768
3769         /* use sparse to check that we don't return without updating */
3770         __acquire(check_fast_rx);
3771
3772         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3773         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3774         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3775         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3776
3777         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3778
3779         /* fast-rx doesn't do reordering */
3780         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3781             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3782                 goto clear;
3783
3784         switch (sdata->vif.type) {
3785         case NL80211_IFTYPE_STATION:
3786                 if (sta->sta.tdls) {
3787                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3788                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3789                         fastrx.expected_ds_bits = 0;
3790                 } else {
3791                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3792                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3793                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3794                         fastrx.expected_ds_bits =
3795                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3796                 }
3797
3798                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3799                         fastrx.expected_ds_bits |=
3800                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3801                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3802                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3803                 }
3804
3805                 if (!sdata->u.mgd.powersave)
3806                         break;
3807
3808                 /* software powersave is a huge mess, avoid all of it */
3809                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3810                         goto clear;
3811                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3812                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3813                         goto clear;
3814                 break;
3815         case NL80211_IFTYPE_AP_VLAN:
3816         case NL80211_IFTYPE_AP:
3817                 /* parallel-rx requires this, at least with calls to
3818                  * ieee80211_sta_ps_transition()
3819                  */
3820                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3821                         goto clear;
3822                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3823                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3824                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3825
3826                 fastrx.internal_forward =
3827                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3828                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3829                          !sdata->u.vlan.sta);
3830
3831                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3832                     sdata->u.vlan.sta) {
3833                         fastrx.expected_ds_bits |=
3834                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3835                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3836                         fastrx.internal_forward = 0;
3837                 }
3838
3839                 break;
3840         default:
3841                 goto clear;
3842         }
3843
3844         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3845                 goto clear;
3846
3847         rcu_read_lock();
3848         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3849         if (key) {
3850                 switch (key->conf.cipher) {
3851                 case WLAN_CIPHER_SUITE_TKIP:
3852                         /* we don't want to deal with MMIC in fast-rx */
3853                         goto clear_rcu;
3854                 case WLAN_CIPHER_SUITE_CCMP:
3855                 case WLAN_CIPHER_SUITE_CCMP_256:
3856                 case WLAN_CIPHER_SUITE_GCMP:
3857                 case WLAN_CIPHER_SUITE_GCMP_256:
3858                         break;
3859                 default:
3860                         /* we also don't want to deal with WEP or cipher scheme
3861                          * since those require looking up the key idx in the
3862                          * frame, rather than assuming the PTK is used
3863                          * (we need to revisit this once we implement the real
3864                          * PTK index, which is now valid in the spec, but we
3865                          * haven't implemented that part yet)
3866                          */
3867                         goto clear_rcu;
3868                 }
3869
3870                 fastrx.key = true;
3871                 fastrx.icv_len = key->conf.icv_len;
3872         }
3873
3874         assign = true;
3875  clear_rcu:
3876         rcu_read_unlock();
3877  clear:
3878         __release(check_fast_rx);
3879
3880         if (assign)
3881                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3882
3883         spin_lock_bh(&sta->lock);
3884         old = rcu_dereference_protected(sta->fast_rx, true);
3885         rcu_assign_pointer(sta->fast_rx, new);
3886         spin_unlock_bh(&sta->lock);
3887
3888         if (old)
3889                 kfree_rcu(old, rcu_head);
3890 }
3891
3892 void ieee80211_clear_fast_rx(struct sta_info *sta)
3893 {
3894         struct ieee80211_fast_rx *old;
3895
3896         spin_lock_bh(&sta->lock);
3897         old = rcu_dereference_protected(sta->fast_rx, true);
3898         RCU_INIT_POINTER(sta->fast_rx, NULL);
3899         spin_unlock_bh(&sta->lock);
3900
3901         if (old)
3902                 kfree_rcu(old, rcu_head);
3903 }
3904
3905 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3906 {
3907         struct ieee80211_local *local = sdata->local;
3908         struct sta_info *sta;
3909
3910         lockdep_assert_held(&local->sta_mtx);
3911
3912         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3913                 if (sdata != sta->sdata &&
3914                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3915                         continue;
3916                 ieee80211_check_fast_rx(sta);
3917         }
3918 }
3919
3920 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3921 {
3922         struct ieee80211_local *local = sdata->local;
3923
3924         mutex_lock(&local->sta_mtx);
3925         __ieee80211_check_fast_rx_iface(sdata);
3926         mutex_unlock(&local->sta_mtx);
3927 }
3928
3929 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3930                                      struct ieee80211_fast_rx *fast_rx)
3931 {
3932         struct sk_buff *skb = rx->skb;
3933         struct ieee80211_hdr *hdr = (void *)skb->data;
3934         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3935         struct sta_info *sta = rx->sta;
3936         int orig_len = skb->len;
3937         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3938         int snap_offs = hdrlen;
3939         struct {
3940                 u8 snap[sizeof(rfc1042_header)];
3941                 __be16 proto;
3942         } *payload __aligned(2);
3943         struct {
3944                 u8 da[ETH_ALEN];
3945                 u8 sa[ETH_ALEN];
3946         } addrs __aligned(2);
3947         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3948
3949         if (fast_rx->uses_rss)
3950                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3951
3952         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3953          * to a common data structure; drivers can implement that per queue
3954          * but we don't have that information in mac80211
3955          */
3956         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3957                 return false;
3958
3959 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3960
3961         /* If using encryption, we also need to have:
3962          *  - PN_VALIDATED: similar, but the implementation is tricky
3963          *  - DECRYPTED: necessary for PN_VALIDATED
3964          */
3965         if (fast_rx->key &&
3966             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3967                 return false;
3968
3969         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3970                 return false;
3971
3972         if (unlikely(ieee80211_is_frag(hdr)))
3973                 return false;
3974
3975         /* Since our interface address cannot be multicast, this
3976          * implicitly also rejects multicast frames without the
3977          * explicit check.
3978          *
3979          * We shouldn't get any *data* frames not addressed to us
3980          * (AP mode will accept multicast *management* frames), but
3981          * punting here will make it go through the full checks in
3982          * ieee80211_accept_frame().
3983          */
3984         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3985                 return false;
3986
3987         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3988                                               IEEE80211_FCTL_TODS)) !=
3989             fast_rx->expected_ds_bits)
3990                 return false;
3991
3992         /* assign the key to drop unencrypted frames (later)
3993          * and strip the IV/MIC if necessary
3994          */
3995         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3996                 /* GCMP header length is the same */
3997                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3998         }
3999
4000         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4001                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4002                         goto drop;
4003
4004                 payload = (void *)(skb->data + snap_offs);
4005
4006                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4007                         return false;
4008
4009                 /* Don't handle these here since they require special code.
4010                  * Accept AARP and IPX even though they should come with a
4011                  * bridge-tunnel header - but if we get them this way then
4012                  * there's little point in discarding them.
4013                  */
4014                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4015                              payload->proto == fast_rx->control_port_protocol))
4016                         return false;
4017         }
4018
4019         /* after this point, don't punt to the slowpath! */
4020
4021         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4022             pskb_trim(skb, skb->len - fast_rx->icv_len))
4023                 goto drop;
4024
4025         if (unlikely(fast_rx->sta_notify)) {
4026                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4027                 fast_rx->sta_notify = false;
4028         }
4029
4030         /* statistics part of ieee80211_rx_h_sta_process() */
4031         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4032                 stats->last_signal = status->signal;
4033                 if (!fast_rx->uses_rss)
4034                         ewma_signal_add(&sta->rx_stats_avg.signal,
4035                                         -status->signal);
4036         }
4037
4038         if (status->chains) {
4039                 int i;
4040
4041                 stats->chains = status->chains;
4042                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4043                         int signal = status->chain_signal[i];
4044
4045                         if (!(status->chains & BIT(i)))
4046                                 continue;
4047
4048                         stats->chain_signal_last[i] = signal;
4049                         if (!fast_rx->uses_rss)
4050                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4051                                                 -signal);
4052                 }
4053         }
4054         /* end of statistics */
4055
4056         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4057                 goto drop;
4058
4059         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4060                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4061                     RX_QUEUED)
4062                         goto drop;
4063
4064                 return true;
4065         }
4066
4067         stats->last_rx = jiffies;
4068         stats->last_rate = sta_stats_encode_rate(status);
4069
4070         stats->fragments++;
4071         stats->packets++;
4072
4073         /* do the header conversion - first grab the addresses */
4074         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4075         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4076         /* remove the SNAP but leave the ethertype */
4077         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4078         /* push the addresses in front */
4079         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4080
4081         skb->dev = fast_rx->dev;
4082
4083         ieee80211_rx_stats(fast_rx->dev, skb->len);
4084
4085         /* The seqno index has the same property as needed
4086          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4087          * for non-QoS-data frames. Here we know it's a data
4088          * frame, so count MSDUs.
4089          */
4090         u64_stats_update_begin(&stats->syncp);
4091         stats->msdu[rx->seqno_idx]++;
4092         stats->bytes += orig_len;
4093         u64_stats_update_end(&stats->syncp);
4094
4095         if (fast_rx->internal_forward) {
4096                 struct sk_buff *xmit_skb = NULL;
4097                 bool multicast = is_multicast_ether_addr(skb->data);
4098
4099                 if (multicast) {
4100                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4101                 } else if (sta_info_get(rx->sdata, skb->data)) {
4102                         xmit_skb = skb;
4103                         skb = NULL;
4104                 }
4105
4106                 if (xmit_skb) {
4107                         /*
4108                          * Send to wireless media and increase priority by 256
4109                          * to keep the received priority instead of
4110                          * reclassifying the frame (see cfg80211_classify8021d).
4111                          */
4112                         xmit_skb->priority += 256;
4113                         xmit_skb->protocol = htons(ETH_P_802_3);
4114                         skb_reset_network_header(xmit_skb);
4115                         skb_reset_mac_header(xmit_skb);
4116                         dev_queue_xmit(xmit_skb);
4117                 }
4118
4119                 if (!skb)
4120                         return true;
4121         }
4122
4123         /* deliver to local stack */
4124         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4125         memset(skb->cb, 0, sizeof(skb->cb));
4126         if (rx->napi)
4127                 napi_gro_receive(rx->napi, skb);
4128         else
4129                 netif_receive_skb(skb);
4130
4131         return true;
4132  drop:
4133         dev_kfree_skb(skb);
4134         stats->dropped++;
4135         return true;
4136 }
4137
4138 /*
4139  * This function returns whether or not the SKB
4140  * was destined for RX processing or not, which,
4141  * if consume is true, is equivalent to whether
4142  * or not the skb was consumed.
4143  */
4144 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4145                                             struct sk_buff *skb, bool consume)
4146 {
4147         struct ieee80211_local *local = rx->local;
4148         struct ieee80211_sub_if_data *sdata = rx->sdata;
4149
4150         rx->skb = skb;
4151
4152         /* See if we can do fast-rx; if we have to copy we already lost,
4153          * so punt in that case. We should never have to deliver a data
4154          * frame to multiple interfaces anyway.
4155          *
4156          * We skip the ieee80211_accept_frame() call and do the necessary
4157          * checking inside ieee80211_invoke_fast_rx().
4158          */
4159         if (consume && rx->sta) {
4160                 struct ieee80211_fast_rx *fast_rx;
4161
4162                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4163                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4164                         return true;
4165         }
4166
4167         if (!ieee80211_accept_frame(rx))
4168                 return false;
4169
4170         if (!consume) {
4171                 skb = skb_copy(skb, GFP_ATOMIC);
4172                 if (!skb) {
4173                         if (net_ratelimit())
4174                                 wiphy_debug(local->hw.wiphy,
4175                                         "failed to copy skb for %s\n",
4176                                         sdata->name);
4177                         return true;
4178                 }
4179
4180                 rx->skb = skb;
4181         }
4182
4183         ieee80211_invoke_rx_handlers(rx);
4184         return true;
4185 }
4186
4187 /*
4188  * This is the actual Rx frames handler. as it belongs to Rx path it must
4189  * be called with rcu_read_lock protection.
4190  */
4191 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4192                                          struct ieee80211_sta *pubsta,
4193                                          struct sk_buff *skb,
4194                                          struct napi_struct *napi)
4195 {
4196         struct ieee80211_local *local = hw_to_local(hw);
4197         struct ieee80211_sub_if_data *sdata;
4198         struct ieee80211_hdr *hdr;
4199         __le16 fc;
4200         struct ieee80211_rx_data rx;
4201         struct ieee80211_sub_if_data *prev;
4202         struct rhlist_head *tmp;
4203         int err = 0;
4204
4205         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4206         memset(&rx, 0, sizeof(rx));
4207         rx.skb = skb;
4208         rx.local = local;
4209         rx.napi = napi;
4210
4211         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4212                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4213
4214         if (ieee80211_is_mgmt(fc)) {
4215                 /* drop frame if too short for header */
4216                 if (skb->len < ieee80211_hdrlen(fc))
4217                         err = -ENOBUFS;
4218                 else
4219                         err = skb_linearize(skb);
4220         } else {
4221                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4222         }
4223
4224         if (err) {
4225                 dev_kfree_skb(skb);
4226                 return;
4227         }
4228
4229         hdr = (struct ieee80211_hdr *)skb->data;
4230         ieee80211_parse_qos(&rx);
4231         ieee80211_verify_alignment(&rx);
4232
4233         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4234                      ieee80211_is_beacon(hdr->frame_control)))
4235                 ieee80211_scan_rx(local, skb);
4236
4237         if (ieee80211_is_data(fc)) {
4238                 struct sta_info *sta, *prev_sta;
4239
4240                 if (pubsta) {
4241                         rx.sta = container_of(pubsta, struct sta_info, sta);
4242                         rx.sdata = rx.sta->sdata;
4243                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4244                                 return;
4245                         goto out;
4246                 }
4247
4248                 prev_sta = NULL;
4249
4250                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4251                         if (!prev_sta) {
4252                                 prev_sta = sta;
4253                                 continue;
4254                         }
4255
4256                         rx.sta = prev_sta;
4257                         rx.sdata = prev_sta->sdata;
4258                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4259
4260                         prev_sta = sta;
4261                 }
4262
4263                 if (prev_sta) {
4264                         rx.sta = prev_sta;
4265                         rx.sdata = prev_sta->sdata;
4266
4267                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4268                                 return;
4269                         goto out;
4270                 }
4271         }
4272
4273         prev = NULL;
4274
4275         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4276                 if (!ieee80211_sdata_running(sdata))
4277                         continue;
4278
4279                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4280                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4281                         continue;
4282
4283                 /*
4284                  * frame is destined for this interface, but if it's
4285                  * not also for the previous one we handle that after
4286                  * the loop to avoid copying the SKB once too much
4287                  */
4288
4289                 if (!prev) {
4290                         prev = sdata;
4291                         continue;
4292                 }
4293
4294                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4295                 rx.sdata = prev;
4296                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4297
4298                 prev = sdata;
4299         }
4300
4301         if (prev) {
4302                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4303                 rx.sdata = prev;
4304
4305                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4306                         return;
4307         }
4308
4309  out:
4310         dev_kfree_skb(skb);
4311 }
4312
4313 /*
4314  * This is the receive path handler. It is called by a low level driver when an
4315  * 802.11 MPDU is received from the hardware.
4316  */
4317 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4318                        struct sk_buff *skb, struct napi_struct *napi)
4319 {
4320         struct ieee80211_local *local = hw_to_local(hw);
4321         struct ieee80211_rate *rate = NULL;
4322         struct ieee80211_supported_band *sband;
4323         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4324
4325         WARN_ON_ONCE(softirq_count() == 0);
4326
4327         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4328                 goto drop;
4329
4330         sband = local->hw.wiphy->bands[status->band];
4331         if (WARN_ON(!sband))
4332                 goto drop;
4333
4334         /*
4335          * If we're suspending, it is possible although not too likely
4336          * that we'd be receiving frames after having already partially
4337          * quiesced the stack. We can't process such frames then since
4338          * that might, for example, cause stations to be added or other
4339          * driver callbacks be invoked.
4340          */
4341         if (unlikely(local->quiescing || local->suspended))
4342                 goto drop;
4343
4344         /* We might be during a HW reconfig, prevent Rx for the same reason */
4345         if (unlikely(local->in_reconfig))
4346                 goto drop;
4347
4348         /*
4349          * The same happens when we're not even started,
4350          * but that's worth a warning.
4351          */
4352         if (WARN_ON(!local->started))
4353                 goto drop;
4354
4355         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4356                 /*
4357                  * Validate the rate, unless a PLCP error means that
4358                  * we probably can't have a valid rate here anyway.
4359                  */
4360
4361                 switch (status->encoding) {
4362                 case RX_ENC_HT:
4363                         /*
4364                          * rate_idx is MCS index, which can be [0-76]
4365                          * as documented on:
4366                          *
4367                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4368                          *
4369                          * Anything else would be some sort of driver or
4370                          * hardware error. The driver should catch hardware
4371                          * errors.
4372                          */
4373                         if (WARN(status->rate_idx > 76,
4374                                  "Rate marked as an HT rate but passed "
4375                                  "status->rate_idx is not "
4376                                  "an MCS index [0-76]: %d (0x%02x)\n",
4377                                  status->rate_idx,
4378                                  status->rate_idx))
4379                                 goto drop;
4380                         break;
4381                 case RX_ENC_VHT:
4382                         if (WARN_ONCE(status->rate_idx > 9 ||
4383                                       !status->nss ||
4384                                       status->nss > 8,
4385                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4386                                       status->rate_idx, status->nss))
4387                                 goto drop;
4388                         break;
4389                 default:
4390                         WARN_ON_ONCE(1);
4391                         /* fall through */
4392                 case RX_ENC_LEGACY:
4393                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4394                                 goto drop;
4395                         rate = &sband->bitrates[status->rate_idx];
4396                 }
4397         }
4398
4399         status->rx_flags = 0;
4400
4401         /*
4402          * key references and virtual interfaces are protected using RCU
4403          * and this requires that we are in a read-side RCU section during
4404          * receive processing
4405          */
4406         rcu_read_lock();
4407
4408         /*
4409          * Frames with failed FCS/PLCP checksum are not returned,
4410          * all other frames are returned without radiotap header
4411          * if it was previously present.
4412          * Also, frames with less than 16 bytes are dropped.
4413          */
4414         skb = ieee80211_rx_monitor(local, skb, rate);
4415         if (!skb) {
4416                 rcu_read_unlock();
4417                 return;
4418         }
4419
4420         ieee80211_tpt_led_trig_rx(local,
4421                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4422                         skb->len);
4423
4424         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4425
4426         rcu_read_unlock();
4427
4428         return;
4429  drop:
4430         kfree_skb(skb);
4431 }
4432 EXPORT_SYMBOL(ieee80211_rx_napi);
4433
4434 /* This is a version of the rx handler that can be called from hard irq
4435  * context. Post the skb on the queue and schedule the tasklet */
4436 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4437 {
4438         struct ieee80211_local *local = hw_to_local(hw);
4439
4440         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4441
4442         skb->pkt_type = IEEE80211_RX_MSG;
4443         skb_queue_tail(&local->skb_queue, skb);
4444         tasklet_schedule(&local->tasklet);
4445 }
4446 EXPORT_SYMBOL(ieee80211_rx_irqsafe);