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
2258                 cfg80211_rx_control_port(dev, skb, noencrypt);
2259                 dev_kfree_skb(skb);
2260         } else {
2261                 /* deliver to local stack */
2262                 if (rx->napi)
2263                         napi_gro_receive(rx->napi, skb);
2264                 else
2265                         netif_receive_skb(skb);
2266         }
2267 }
2268
2269 /*
2270  * requires that rx->skb is a frame with ethernet header
2271  */
2272 static void
2273 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2274 {
2275         struct ieee80211_sub_if_data *sdata = rx->sdata;
2276         struct net_device *dev = sdata->dev;
2277         struct sk_buff *skb, *xmit_skb;
2278         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2279         struct sta_info *dsta;
2280
2281         skb = rx->skb;
2282         xmit_skb = NULL;
2283
2284         ieee80211_rx_stats(dev, skb->len);
2285
2286         if (rx->sta) {
2287                 /* The seqno index has the same property as needed
2288                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2289                  * for non-QoS-data frames. Here we know it's a data
2290                  * frame, so count MSDUs.
2291                  */
2292                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2293                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2294                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2295         }
2296
2297         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2298              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2299             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2300             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2301                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2302                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2303                         /*
2304                          * send multicast frames both to higher layers in
2305                          * local net stack and back to the wireless medium
2306                          */
2307                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2308                         if (!xmit_skb)
2309                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2310                                                     dev->name);
2311                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2312                         dsta = sta_info_get(sdata, skb->data);
2313                         if (dsta) {
2314                                 /*
2315                                  * The destination station is associated to
2316                                  * this AP (in this VLAN), so send the frame
2317                                  * directly to it and do not pass it to local
2318                                  * net stack.
2319                                  */
2320                                 xmit_skb = skb;
2321                                 skb = NULL;
2322                         }
2323                 }
2324         }
2325
2326 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2327         if (skb) {
2328                 /* 'align' will only take the values 0 or 2 here since all
2329                  * frames are required to be aligned to 2-byte boundaries
2330                  * when being passed to mac80211; the code here works just
2331                  * as well if that isn't true, but mac80211 assumes it can
2332                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2333                  */
2334                 int align;
2335
2336                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2337                 if (align) {
2338                         if (WARN_ON(skb_headroom(skb) < 3)) {
2339                                 dev_kfree_skb(skb);
2340                                 skb = NULL;
2341                         } else {
2342                                 u8 *data = skb->data;
2343                                 size_t len = skb_headlen(skb);
2344                                 skb->data -= align;
2345                                 memmove(skb->data, data, len);
2346                                 skb_set_tail_pointer(skb, len);
2347                         }
2348                 }
2349         }
2350 #endif
2351
2352         if (skb) {
2353                 skb->protocol = eth_type_trans(skb, dev);
2354                 memset(skb->cb, 0, sizeof(skb->cb));
2355
2356                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2357         }
2358
2359         if (xmit_skb) {
2360                 /*
2361                  * Send to wireless media and increase priority by 256 to
2362                  * keep the received priority instead of reclassifying
2363                  * the frame (see cfg80211_classify8021d).
2364                  */
2365                 xmit_skb->priority += 256;
2366                 xmit_skb->protocol = htons(ETH_P_802_3);
2367                 skb_reset_network_header(xmit_skb);
2368                 skb_reset_mac_header(xmit_skb);
2369                 dev_queue_xmit(xmit_skb);
2370         }
2371 }
2372
2373 static ieee80211_rx_result debug_noinline
2374 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2375 {
2376         struct net_device *dev = rx->sdata->dev;
2377         struct sk_buff *skb = rx->skb;
2378         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2379         __le16 fc = hdr->frame_control;
2380         struct sk_buff_head frame_list;
2381         struct ethhdr ethhdr;
2382         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2383
2384         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2385                 check_da = NULL;
2386                 check_sa = NULL;
2387         } else switch (rx->sdata->vif.type) {
2388                 case NL80211_IFTYPE_AP:
2389                 case NL80211_IFTYPE_AP_VLAN:
2390                         check_da = NULL;
2391                         break;
2392                 case NL80211_IFTYPE_STATION:
2393                         if (!rx->sta ||
2394                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2395                                 check_sa = NULL;
2396                         break;
2397                 case NL80211_IFTYPE_MESH_POINT:
2398                         check_sa = NULL;
2399                         break;
2400                 default:
2401                         break;
2402         }
2403
2404         skb->dev = dev;
2405         __skb_queue_head_init(&frame_list);
2406
2407         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2408                                           rx->sdata->vif.addr,
2409                                           rx->sdata->vif.type,
2410                                           data_offset))
2411                 return RX_DROP_UNUSABLE;
2412
2413         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2414                                  rx->sdata->vif.type,
2415                                  rx->local->hw.extra_tx_headroom,
2416                                  check_da, check_sa);
2417
2418         while (!skb_queue_empty(&frame_list)) {
2419                 rx->skb = __skb_dequeue(&frame_list);
2420
2421                 if (!ieee80211_frame_allowed(rx, fc)) {
2422                         dev_kfree_skb(rx->skb);
2423                         continue;
2424                 }
2425
2426                 ieee80211_deliver_skb(rx);
2427         }
2428
2429         return RX_QUEUED;
2430 }
2431
2432 static ieee80211_rx_result debug_noinline
2433 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2434 {
2435         struct sk_buff *skb = rx->skb;
2436         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2437         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2438         __le16 fc = hdr->frame_control;
2439
2440         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2441                 return RX_CONTINUE;
2442
2443         if (unlikely(!ieee80211_is_data(fc)))
2444                 return RX_CONTINUE;
2445
2446         if (unlikely(!ieee80211_is_data_present(fc)))
2447                 return RX_DROP_MONITOR;
2448
2449         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2450                 switch (rx->sdata->vif.type) {
2451                 case NL80211_IFTYPE_AP_VLAN:
2452                         if (!rx->sdata->u.vlan.sta)
2453                                 return RX_DROP_UNUSABLE;
2454                         break;
2455                 case NL80211_IFTYPE_STATION:
2456                         if (!rx->sdata->u.mgd.use_4addr)
2457                                 return RX_DROP_UNUSABLE;
2458                         break;
2459                 default:
2460                         return RX_DROP_UNUSABLE;
2461                 }
2462         }
2463
2464         if (is_multicast_ether_addr(hdr->addr1))
2465                 return RX_DROP_UNUSABLE;
2466
2467         return __ieee80211_rx_h_amsdu(rx, 0);
2468 }
2469
2470 #ifdef CONFIG_MAC80211_MESH
2471 static ieee80211_rx_result
2472 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2473 {
2474         struct ieee80211_hdr *fwd_hdr, *hdr;
2475         struct ieee80211_tx_info *info;
2476         struct ieee80211s_hdr *mesh_hdr;
2477         struct sk_buff *skb = rx->skb, *fwd_skb;
2478         struct ieee80211_local *local = rx->local;
2479         struct ieee80211_sub_if_data *sdata = rx->sdata;
2480         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2481         u16 ac, q, hdrlen;
2482
2483         hdr = (struct ieee80211_hdr *) skb->data;
2484         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2485
2486         /* make sure fixed part of mesh header is there, also checks skb len */
2487         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2488                 return RX_DROP_MONITOR;
2489
2490         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2491
2492         /* make sure full mesh header is there, also checks skb len */
2493         if (!pskb_may_pull(rx->skb,
2494                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2495                 return RX_DROP_MONITOR;
2496
2497         /* reload pointers */
2498         hdr = (struct ieee80211_hdr *) skb->data;
2499         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2500
2501         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2502                 return RX_DROP_MONITOR;
2503
2504         /* frame is in RMC, don't forward */
2505         if (ieee80211_is_data(hdr->frame_control) &&
2506             is_multicast_ether_addr(hdr->addr1) &&
2507             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2508                 return RX_DROP_MONITOR;
2509
2510         if (!ieee80211_is_data(hdr->frame_control))
2511                 return RX_CONTINUE;
2512
2513         if (!mesh_hdr->ttl)
2514                 return RX_DROP_MONITOR;
2515
2516         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2517                 struct mesh_path *mppath;
2518                 char *proxied_addr;
2519                 char *mpp_addr;
2520
2521                 if (is_multicast_ether_addr(hdr->addr1)) {
2522                         mpp_addr = hdr->addr3;
2523                         proxied_addr = mesh_hdr->eaddr1;
2524                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2525                             MESH_FLAGS_AE_A5_A6) {
2526                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2527                         mpp_addr = hdr->addr4;
2528                         proxied_addr = mesh_hdr->eaddr2;
2529                 } else {
2530                         return RX_DROP_MONITOR;
2531                 }
2532
2533                 rcu_read_lock();
2534                 mppath = mpp_path_lookup(sdata, proxied_addr);
2535                 if (!mppath) {
2536                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2537                 } else {
2538                         spin_lock_bh(&mppath->state_lock);
2539                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2540                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2541                         mppath->exp_time = jiffies;
2542                         spin_unlock_bh(&mppath->state_lock);
2543                 }
2544                 rcu_read_unlock();
2545         }
2546
2547         /* Frame has reached destination.  Don't forward */
2548         if (!is_multicast_ether_addr(hdr->addr1) &&
2549             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2550                 return RX_CONTINUE;
2551
2552         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2553         q = sdata->vif.hw_queue[ac];
2554         if (ieee80211_queue_stopped(&local->hw, q)) {
2555                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2556                 return RX_DROP_MONITOR;
2557         }
2558         skb_set_queue_mapping(skb, q);
2559
2560         if (!--mesh_hdr->ttl) {
2561                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2562                 goto out;
2563         }
2564
2565         if (!ifmsh->mshcfg.dot11MeshForwarding)
2566                 goto out;
2567
2568         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2569                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2570         if (!fwd_skb)
2571                 goto out;
2572
2573         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2574         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2575         info = IEEE80211_SKB_CB(fwd_skb);
2576         memset(info, 0, sizeof(*info));
2577         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2578         info->control.vif = &rx->sdata->vif;
2579         info->control.jiffies = jiffies;
2580         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2581                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2582                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2583                 /* update power mode indication when forwarding */
2584                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2585         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2586                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2587                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2588         } else {
2589                 /* unable to resolve next hop */
2590                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2591                                    fwd_hdr->addr3, 0,
2592                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2593                                    fwd_hdr->addr2);
2594                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2595                 kfree_skb(fwd_skb);
2596                 return RX_DROP_MONITOR;
2597         }
2598
2599         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2600         ieee80211_add_pending_skb(local, fwd_skb);
2601  out:
2602         if (is_multicast_ether_addr(hdr->addr1))
2603                 return RX_CONTINUE;
2604         return RX_DROP_MONITOR;
2605 }
2606 #endif
2607
2608 static ieee80211_rx_result debug_noinline
2609 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2610 {
2611         struct ieee80211_sub_if_data *sdata = rx->sdata;
2612         struct ieee80211_local *local = rx->local;
2613         struct net_device *dev = sdata->dev;
2614         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2615         __le16 fc = hdr->frame_control;
2616         bool port_control;
2617         int err;
2618
2619         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2620                 return RX_CONTINUE;
2621
2622         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2623                 return RX_DROP_MONITOR;
2624
2625         /*
2626          * Send unexpected-4addr-frame event to hostapd. For older versions,
2627          * also drop the frame to cooked monitor interfaces.
2628          */
2629         if (ieee80211_has_a4(hdr->frame_control) &&
2630             sdata->vif.type == NL80211_IFTYPE_AP) {
2631                 if (rx->sta &&
2632                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2633                         cfg80211_rx_unexpected_4addr_frame(
2634                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2635                 return RX_DROP_MONITOR;
2636         }
2637
2638         err = __ieee80211_data_to_8023(rx, &port_control);
2639         if (unlikely(err))
2640                 return RX_DROP_UNUSABLE;
2641
2642         if (!ieee80211_frame_allowed(rx, fc))
2643                 return RX_DROP_MONITOR;
2644
2645         /* directly handle TDLS channel switch requests/responses */
2646         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2647                                                 cpu_to_be16(ETH_P_TDLS))) {
2648                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2649
2650                 if (pskb_may_pull(rx->skb,
2651                                   offsetof(struct ieee80211_tdls_data, u)) &&
2652                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2653                     tf->category == WLAN_CATEGORY_TDLS &&
2654                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2655                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2656                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2657                         schedule_work(&local->tdls_chsw_work);
2658                         if (rx->sta)
2659                                 rx->sta->rx_stats.packets++;
2660
2661                         return RX_QUEUED;
2662                 }
2663         }
2664
2665         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2666             unlikely(port_control) && sdata->bss) {
2667                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2668                                      u.ap);
2669                 dev = sdata->dev;
2670                 rx->sdata = sdata;
2671         }
2672
2673         rx->skb->dev = dev;
2674
2675         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2676             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2677             !is_multicast_ether_addr(
2678                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2679             (!local->scanning &&
2680              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2681                 mod_timer(&local->dynamic_ps_timer, jiffies +
2682                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2683
2684         ieee80211_deliver_skb(rx);
2685
2686         return RX_QUEUED;
2687 }
2688
2689 static ieee80211_rx_result debug_noinline
2690 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2691 {
2692         struct sk_buff *skb = rx->skb;
2693         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2694         struct tid_ampdu_rx *tid_agg_rx;
2695         u16 start_seq_num;
2696         u16 tid;
2697
2698         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2699                 return RX_CONTINUE;
2700
2701         if (ieee80211_is_back_req(bar->frame_control)) {
2702                 struct {
2703                         __le16 control, start_seq_num;
2704                 } __packed bar_data;
2705                 struct ieee80211_event event = {
2706                         .type = BAR_RX_EVENT,
2707                 };
2708
2709                 if (!rx->sta)
2710                         return RX_DROP_MONITOR;
2711
2712                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2713                                   &bar_data, sizeof(bar_data)))
2714                         return RX_DROP_MONITOR;
2715
2716                 tid = le16_to_cpu(bar_data.control) >> 12;
2717
2718                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2719                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2720                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2721                                              WLAN_BACK_RECIPIENT,
2722                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2723
2724                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2725                 if (!tid_agg_rx)
2726                         return RX_DROP_MONITOR;
2727
2728                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2729                 event.u.ba.tid = tid;
2730                 event.u.ba.ssn = start_seq_num;
2731                 event.u.ba.sta = &rx->sta->sta;
2732
2733                 /* reset session timer */
2734                 if (tid_agg_rx->timeout)
2735                         mod_timer(&tid_agg_rx->session_timer,
2736                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2737
2738                 spin_lock(&tid_agg_rx->reorder_lock);
2739                 /* release stored frames up to start of BAR */
2740                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2741                                                  start_seq_num, frames);
2742                 spin_unlock(&tid_agg_rx->reorder_lock);
2743
2744                 drv_event_callback(rx->local, rx->sdata, &event);
2745
2746                 kfree_skb(skb);
2747                 return RX_QUEUED;
2748         }
2749
2750         /*
2751          * After this point, we only want management frames,
2752          * so we can drop all remaining control frames to
2753          * cooked monitor interfaces.
2754          */
2755         return RX_DROP_MONITOR;
2756 }
2757
2758 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2759                                            struct ieee80211_mgmt *mgmt,
2760                                            size_t len)
2761 {
2762         struct ieee80211_local *local = sdata->local;
2763         struct sk_buff *skb;
2764         struct ieee80211_mgmt *resp;
2765
2766         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2767                 /* Not to own unicast address */
2768                 return;
2769         }
2770
2771         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2772             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2773                 /* Not from the current AP or not associated yet. */
2774                 return;
2775         }
2776
2777         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2778                 /* Too short SA Query request frame */
2779                 return;
2780         }
2781
2782         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2783         if (skb == NULL)
2784                 return;
2785
2786         skb_reserve(skb, local->hw.extra_tx_headroom);
2787         resp = skb_put_zero(skb, 24);
2788         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2789         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2790         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2791         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2792                                           IEEE80211_STYPE_ACTION);
2793         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2794         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2795         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2796         memcpy(resp->u.action.u.sa_query.trans_id,
2797                mgmt->u.action.u.sa_query.trans_id,
2798                WLAN_SA_QUERY_TR_ID_LEN);
2799
2800         ieee80211_tx_skb(sdata, skb);
2801 }
2802
2803 static ieee80211_rx_result debug_noinline
2804 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2805 {
2806         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2807         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2808
2809         /*
2810          * From here on, look only at management frames.
2811          * Data and control frames are already handled,
2812          * and unknown (reserved) frames are useless.
2813          */
2814         if (rx->skb->len < 24)
2815                 return RX_DROP_MONITOR;
2816
2817         if (!ieee80211_is_mgmt(mgmt->frame_control))
2818                 return RX_DROP_MONITOR;
2819
2820         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2821             ieee80211_is_beacon(mgmt->frame_control) &&
2822             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2823                 int sig = 0;
2824
2825                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2826                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2827                         sig = status->signal;
2828
2829                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2830                                             rx->skb->data, rx->skb->len,
2831                                             status->freq, sig);
2832                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2833         }
2834
2835         if (ieee80211_drop_unencrypted_mgmt(rx))
2836                 return RX_DROP_UNUSABLE;
2837
2838         return RX_CONTINUE;
2839 }
2840
2841 static ieee80211_rx_result debug_noinline
2842 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2843 {
2844         struct ieee80211_local *local = rx->local;
2845         struct ieee80211_sub_if_data *sdata = rx->sdata;
2846         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2847         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2848         int len = rx->skb->len;
2849
2850         if (!ieee80211_is_action(mgmt->frame_control))
2851                 return RX_CONTINUE;
2852
2853         /* drop too small frames */
2854         if (len < IEEE80211_MIN_ACTION_SIZE)
2855                 return RX_DROP_UNUSABLE;
2856
2857         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2858             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2859             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2860                 return RX_DROP_UNUSABLE;
2861
2862         switch (mgmt->u.action.category) {
2863         case WLAN_CATEGORY_HT:
2864                 /* reject HT action frames from stations not supporting HT */
2865                 if (!rx->sta->sta.ht_cap.ht_supported)
2866                         goto invalid;
2867
2868                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2869                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2870                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2871                     sdata->vif.type != NL80211_IFTYPE_AP &&
2872                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2873                         break;
2874
2875                 /* verify action & smps_control/chanwidth are present */
2876                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2877                         goto invalid;
2878
2879                 switch (mgmt->u.action.u.ht_smps.action) {
2880                 case WLAN_HT_ACTION_SMPS: {
2881                         struct ieee80211_supported_band *sband;
2882                         enum ieee80211_smps_mode smps_mode;
2883                         struct sta_opmode_info sta_opmode = {};
2884
2885                         /* convert to HT capability */
2886                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2887                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2888                                 smps_mode = IEEE80211_SMPS_OFF;
2889                                 break;
2890                         case WLAN_HT_SMPS_CONTROL_STATIC:
2891                                 smps_mode = IEEE80211_SMPS_STATIC;
2892                                 break;
2893                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2894                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2895                                 break;
2896                         default:
2897                                 goto invalid;
2898                         }
2899
2900                         /* if no change do nothing */
2901                         if (rx->sta->sta.smps_mode == smps_mode)
2902                                 goto handled;
2903                         rx->sta->sta.smps_mode = smps_mode;
2904                         sta_opmode.smps_mode =
2905                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
2906                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
2907
2908                         sband = rx->local->hw.wiphy->bands[status->band];
2909
2910                         rate_control_rate_update(local, sband, rx->sta,
2911                                                  IEEE80211_RC_SMPS_CHANGED);
2912                         cfg80211_sta_opmode_change_notify(sdata->dev,
2913                                                           rx->sta->addr,
2914                                                           &sta_opmode,
2915                                                           GFP_KERNEL);
2916                         goto handled;
2917                 }
2918                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2919                         struct ieee80211_supported_band *sband;
2920                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2921                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2922                         struct sta_opmode_info sta_opmode = {};
2923
2924                         /* If it doesn't support 40 MHz it can't change ... */
2925                         if (!(rx->sta->sta.ht_cap.cap &
2926                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2927                                 goto handled;
2928
2929                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2930                                 max_bw = IEEE80211_STA_RX_BW_20;
2931                         else
2932                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2933
2934                         /* set cur_max_bandwidth and recalc sta bw */
2935                         rx->sta->cur_max_bandwidth = max_bw;
2936                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2937
2938                         if (rx->sta->sta.bandwidth == new_bw)
2939                                 goto handled;
2940
2941                         rx->sta->sta.bandwidth = new_bw;
2942                         sband = rx->local->hw.wiphy->bands[status->band];
2943                         sta_opmode.bw =
2944                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
2945                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
2946
2947                         rate_control_rate_update(local, sband, rx->sta,
2948                                                  IEEE80211_RC_BW_CHANGED);
2949                         cfg80211_sta_opmode_change_notify(sdata->dev,
2950                                                           rx->sta->addr,
2951                                                           &sta_opmode,
2952                                                           GFP_KERNEL);
2953                         goto handled;
2954                 }
2955                 default:
2956                         goto invalid;
2957                 }
2958
2959                 break;
2960         case WLAN_CATEGORY_PUBLIC:
2961                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2962                         goto invalid;
2963                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2964                         break;
2965                 if (!rx->sta)
2966                         break;
2967                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2968                         break;
2969                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2970                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2971                         break;
2972                 if (len < offsetof(struct ieee80211_mgmt,
2973                                    u.action.u.ext_chan_switch.variable))
2974                         goto invalid;
2975                 goto queue;
2976         case WLAN_CATEGORY_VHT:
2977                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2978                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2979                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2980                     sdata->vif.type != NL80211_IFTYPE_AP &&
2981                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2982                         break;
2983
2984                 /* verify action code is present */
2985                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2986                         goto invalid;
2987
2988                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2989                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2990                         /* verify opmode is present */
2991                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2992                                 goto invalid;
2993                         goto queue;
2994                 }
2995                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2996                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2997                                 goto invalid;
2998                         goto queue;
2999                 }
3000                 default:
3001                         break;
3002                 }
3003                 break;
3004         case WLAN_CATEGORY_BACK:
3005                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3006                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3007                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3008                     sdata->vif.type != NL80211_IFTYPE_AP &&
3009                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3010                         break;
3011
3012                 /* verify action_code is present */
3013                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3014                         break;
3015
3016                 switch (mgmt->u.action.u.addba_req.action_code) {
3017                 case WLAN_ACTION_ADDBA_REQ:
3018                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3019                                    sizeof(mgmt->u.action.u.addba_req)))
3020                                 goto invalid;
3021                         break;
3022                 case WLAN_ACTION_ADDBA_RESP:
3023                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3024                                    sizeof(mgmt->u.action.u.addba_resp)))
3025                                 goto invalid;
3026                         break;
3027                 case WLAN_ACTION_DELBA:
3028                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3029                                    sizeof(mgmt->u.action.u.delba)))
3030                                 goto invalid;
3031                         break;
3032                 default:
3033                         goto invalid;
3034                 }
3035
3036                 goto queue;
3037         case WLAN_CATEGORY_SPECTRUM_MGMT:
3038                 /* verify action_code is present */
3039                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3040                         break;
3041
3042                 switch (mgmt->u.action.u.measurement.action_code) {
3043                 case WLAN_ACTION_SPCT_MSR_REQ:
3044                         if (status->band != NL80211_BAND_5GHZ)
3045                                 break;
3046
3047                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3048                                    sizeof(mgmt->u.action.u.measurement)))
3049                                 break;
3050
3051                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3052                                 break;
3053
3054                         ieee80211_process_measurement_req(sdata, mgmt, len);
3055                         goto handled;
3056                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3057                         u8 *bssid;
3058                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3059                                    sizeof(mgmt->u.action.u.chan_switch)))
3060                                 break;
3061
3062                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3063                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3064                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3065                                 break;
3066
3067                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3068                                 bssid = sdata->u.mgd.bssid;
3069                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3070                                 bssid = sdata->u.ibss.bssid;
3071                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3072                                 bssid = mgmt->sa;
3073                         else
3074                                 break;
3075
3076                         if (!ether_addr_equal(mgmt->bssid, bssid))
3077                                 break;
3078
3079                         goto queue;
3080                         }
3081                 }
3082                 break;
3083         case WLAN_CATEGORY_SA_QUERY:
3084                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3085                            sizeof(mgmt->u.action.u.sa_query)))
3086                         break;
3087
3088                 switch (mgmt->u.action.u.sa_query.action) {
3089                 case WLAN_ACTION_SA_QUERY_REQUEST:
3090                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3091                                 break;
3092                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3093                         goto handled;
3094                 }
3095                 break;
3096         case WLAN_CATEGORY_SELF_PROTECTED:
3097                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3098                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3099                         break;
3100
3101                 switch (mgmt->u.action.u.self_prot.action_code) {
3102                 case WLAN_SP_MESH_PEERING_OPEN:
3103                 case WLAN_SP_MESH_PEERING_CLOSE:
3104                 case WLAN_SP_MESH_PEERING_CONFIRM:
3105                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3106                                 goto invalid;
3107                         if (sdata->u.mesh.user_mpm)
3108                                 /* userspace handles this frame */
3109                                 break;
3110                         goto queue;
3111                 case WLAN_SP_MGK_INFORM:
3112                 case WLAN_SP_MGK_ACK:
3113                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3114                                 goto invalid;
3115                         break;
3116                 }
3117                 break;
3118         case WLAN_CATEGORY_MESH_ACTION:
3119                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3120                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3121                         break;
3122
3123                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3124                         break;
3125                 if (mesh_action_is_path_sel(mgmt) &&
3126                     !mesh_path_sel_is_hwmp(sdata))
3127                         break;
3128                 goto queue;
3129         }
3130
3131         return RX_CONTINUE;
3132
3133  invalid:
3134         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3135         /* will return in the next handlers */
3136         return RX_CONTINUE;
3137
3138  handled:
3139         if (rx->sta)
3140                 rx->sta->rx_stats.packets++;
3141         dev_kfree_skb(rx->skb);
3142         return RX_QUEUED;
3143
3144  queue:
3145         skb_queue_tail(&sdata->skb_queue, rx->skb);
3146         ieee80211_queue_work(&local->hw, &sdata->work);
3147         if (rx->sta)
3148                 rx->sta->rx_stats.packets++;
3149         return RX_QUEUED;
3150 }
3151
3152 static ieee80211_rx_result debug_noinline
3153 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3154 {
3155         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3156         int sig = 0;
3157
3158         /* skip known-bad action frames and return them in the next handler */
3159         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3160                 return RX_CONTINUE;
3161
3162         /*
3163          * Getting here means the kernel doesn't know how to handle
3164          * it, but maybe userspace does ... include returned frames
3165          * so userspace can register for those to know whether ones
3166          * it transmitted were processed or returned.
3167          */
3168
3169         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3170             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3171                 sig = status->signal;
3172
3173         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3174                              rx->skb->data, rx->skb->len, 0)) {
3175                 if (rx->sta)
3176                         rx->sta->rx_stats.packets++;
3177                 dev_kfree_skb(rx->skb);
3178                 return RX_QUEUED;
3179         }
3180
3181         return RX_CONTINUE;
3182 }
3183
3184 static ieee80211_rx_result debug_noinline
3185 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3186 {
3187         struct ieee80211_local *local = rx->local;
3188         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3189         struct sk_buff *nskb;
3190         struct ieee80211_sub_if_data *sdata = rx->sdata;
3191         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3192
3193         if (!ieee80211_is_action(mgmt->frame_control))
3194                 return RX_CONTINUE;
3195
3196         /*
3197          * For AP mode, hostapd is responsible for handling any action
3198          * frames that we didn't handle, including returning unknown
3199          * ones. For all other modes we will return them to the sender,
3200          * setting the 0x80 bit in the action category, as required by
3201          * 802.11-2012 9.24.4.
3202          * Newer versions of hostapd shall also use the management frame
3203          * registration mechanisms, but older ones still use cooked
3204          * monitor interfaces so push all frames there.
3205          */
3206         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3207             (sdata->vif.type == NL80211_IFTYPE_AP ||
3208              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3209                 return RX_DROP_MONITOR;
3210
3211         if (is_multicast_ether_addr(mgmt->da))
3212                 return RX_DROP_MONITOR;
3213
3214         /* do not return rejected action frames */
3215         if (mgmt->u.action.category & 0x80)
3216                 return RX_DROP_UNUSABLE;
3217
3218         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3219                                GFP_ATOMIC);
3220         if (nskb) {
3221                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3222
3223                 nmgmt->u.action.category |= 0x80;
3224                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3225                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3226
3227                 memset(nskb->cb, 0, sizeof(nskb->cb));
3228
3229                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3230                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3231
3232                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3233                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3234                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3235                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3236                                 info->hw_queue =
3237                                         local->hw.offchannel_tx_hw_queue;
3238                 }
3239
3240                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3241                                             status->band);
3242         }
3243         dev_kfree_skb(rx->skb);
3244         return RX_QUEUED;
3245 }
3246
3247 static ieee80211_rx_result debug_noinline
3248 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3249 {
3250         struct ieee80211_sub_if_data *sdata = rx->sdata;
3251         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3252         __le16 stype;
3253
3254         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3255
3256         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3257             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3258             sdata->vif.type != NL80211_IFTYPE_OCB &&
3259             sdata->vif.type != NL80211_IFTYPE_STATION)
3260                 return RX_DROP_MONITOR;
3261
3262         switch (stype) {
3263         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3264         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3265         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3266                 /* process for all: mesh, mlme, ibss */
3267                 break;
3268         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3269         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3270         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3271         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3272                 if (is_multicast_ether_addr(mgmt->da) &&
3273                     !is_broadcast_ether_addr(mgmt->da))
3274                         return RX_DROP_MONITOR;
3275
3276                 /* process only for station */
3277                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3278                         return RX_DROP_MONITOR;
3279                 break;
3280         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3281                 /* process only for ibss and mesh */
3282                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3283                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3284                         return RX_DROP_MONITOR;
3285                 break;
3286         default:
3287                 return RX_DROP_MONITOR;
3288         }
3289
3290         /* queue up frame and kick off work to process it */
3291         skb_queue_tail(&sdata->skb_queue, rx->skb);
3292         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3293         if (rx->sta)
3294                 rx->sta->rx_stats.packets++;
3295
3296         return RX_QUEUED;
3297 }
3298
3299 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3300                                         struct ieee80211_rate *rate)
3301 {
3302         struct ieee80211_sub_if_data *sdata;
3303         struct ieee80211_local *local = rx->local;
3304         struct sk_buff *skb = rx->skb, *skb2;
3305         struct net_device *prev_dev = NULL;
3306         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3307         int needed_headroom;
3308
3309         /*
3310          * If cooked monitor has been processed already, then
3311          * don't do it again. If not, set the flag.
3312          */
3313         if (rx->flags & IEEE80211_RX_CMNTR)
3314                 goto out_free_skb;
3315         rx->flags |= IEEE80211_RX_CMNTR;
3316
3317         /* If there are no cooked monitor interfaces, just free the SKB */
3318         if (!local->cooked_mntrs)
3319                 goto out_free_skb;
3320
3321         /* vendor data is long removed here */
3322         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3323         /* room for the radiotap header based on driver features */
3324         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3325
3326         if (skb_headroom(skb) < needed_headroom &&
3327             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3328                 goto out_free_skb;
3329
3330         /* prepend radiotap information */
3331         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3332                                          false);
3333
3334         skb_reset_mac_header(skb);
3335         skb->ip_summed = CHECKSUM_UNNECESSARY;
3336         skb->pkt_type = PACKET_OTHERHOST;
3337         skb->protocol = htons(ETH_P_802_2);
3338
3339         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3340                 if (!ieee80211_sdata_running(sdata))
3341                         continue;
3342
3343                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3344                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3345                         continue;
3346
3347                 if (prev_dev) {
3348                         skb2 = skb_clone(skb, GFP_ATOMIC);
3349                         if (skb2) {
3350                                 skb2->dev = prev_dev;
3351                                 netif_receive_skb(skb2);
3352                         }
3353                 }
3354
3355                 prev_dev = sdata->dev;
3356                 ieee80211_rx_stats(sdata->dev, skb->len);
3357         }
3358
3359         if (prev_dev) {
3360                 skb->dev = prev_dev;
3361                 netif_receive_skb(skb);
3362                 return;
3363         }
3364
3365  out_free_skb:
3366         dev_kfree_skb(skb);
3367 }
3368
3369 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3370                                          ieee80211_rx_result res)
3371 {
3372         switch (res) {
3373         case RX_DROP_MONITOR:
3374                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3375                 if (rx->sta)
3376                         rx->sta->rx_stats.dropped++;
3377                 /* fall through */
3378         case RX_CONTINUE: {
3379                 struct ieee80211_rate *rate = NULL;
3380                 struct ieee80211_supported_band *sband;
3381                 struct ieee80211_rx_status *status;
3382
3383                 status = IEEE80211_SKB_RXCB((rx->skb));
3384
3385                 sband = rx->local->hw.wiphy->bands[status->band];
3386                 if (!(status->encoding == RX_ENC_HT) &&
3387                     !(status->encoding == RX_ENC_VHT))
3388                         rate = &sband->bitrates[status->rate_idx];
3389
3390                 ieee80211_rx_cooked_monitor(rx, rate);
3391                 break;
3392                 }
3393         case RX_DROP_UNUSABLE:
3394                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3395                 if (rx->sta)
3396                         rx->sta->rx_stats.dropped++;
3397                 dev_kfree_skb(rx->skb);
3398                 break;
3399         case RX_QUEUED:
3400                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3401                 break;
3402         }
3403 }
3404
3405 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3406                                   struct sk_buff_head *frames)
3407 {
3408         ieee80211_rx_result res = RX_DROP_MONITOR;
3409         struct sk_buff *skb;
3410
3411 #define CALL_RXH(rxh)                   \
3412         do {                            \
3413                 res = rxh(rx);          \
3414                 if (res != RX_CONTINUE) \
3415                         goto rxh_next;  \
3416         } while (0)
3417
3418         /* Lock here to avoid hitting all of the data used in the RX
3419          * path (e.g. key data, station data, ...) concurrently when
3420          * a frame is released from the reorder buffer due to timeout
3421          * from the timer, potentially concurrently with RX from the
3422          * driver.
3423          */
3424         spin_lock_bh(&rx->local->rx_path_lock);
3425
3426         while ((skb = __skb_dequeue(frames))) {
3427                 /*
3428                  * all the other fields are valid across frames
3429                  * that belong to an aMPDU since they are on the
3430                  * same TID from the same station
3431                  */
3432                 rx->skb = skb;
3433
3434                 CALL_RXH(ieee80211_rx_h_check_more_data);
3435                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3436                 CALL_RXH(ieee80211_rx_h_sta_process);
3437                 CALL_RXH(ieee80211_rx_h_decrypt);
3438                 CALL_RXH(ieee80211_rx_h_defragment);
3439                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3440                 /* must be after MMIC verify so header is counted in MPDU mic */
3441 #ifdef CONFIG_MAC80211_MESH
3442                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3443                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3444 #endif
3445                 CALL_RXH(ieee80211_rx_h_amsdu);
3446                 CALL_RXH(ieee80211_rx_h_data);
3447
3448                 /* special treatment -- needs the queue */
3449                 res = ieee80211_rx_h_ctrl(rx, frames);
3450                 if (res != RX_CONTINUE)
3451                         goto rxh_next;
3452
3453                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3454                 CALL_RXH(ieee80211_rx_h_action);
3455                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3456                 CALL_RXH(ieee80211_rx_h_action_return);
3457                 CALL_RXH(ieee80211_rx_h_mgmt);
3458
3459  rxh_next:
3460                 ieee80211_rx_handlers_result(rx, res);
3461
3462 #undef CALL_RXH
3463         }
3464
3465         spin_unlock_bh(&rx->local->rx_path_lock);
3466 }
3467
3468 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3469 {
3470         struct sk_buff_head reorder_release;
3471         ieee80211_rx_result res = RX_DROP_MONITOR;
3472
3473         __skb_queue_head_init(&reorder_release);
3474
3475 #define CALL_RXH(rxh)                   \
3476         do {                            \
3477                 res = rxh(rx);          \
3478                 if (res != RX_CONTINUE) \
3479                         goto rxh_next;  \
3480         } while (0)
3481
3482         CALL_RXH(ieee80211_rx_h_check_dup);
3483         CALL_RXH(ieee80211_rx_h_check);
3484
3485         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3486
3487         ieee80211_rx_handlers(rx, &reorder_release);
3488         return;
3489
3490  rxh_next:
3491         ieee80211_rx_handlers_result(rx, res);
3492
3493 #undef CALL_RXH
3494 }
3495
3496 /*
3497  * This function makes calls into the RX path, therefore
3498  * it has to be invoked under RCU read lock.
3499  */
3500 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3501 {
3502         struct sk_buff_head frames;
3503         struct ieee80211_rx_data rx = {
3504                 .sta = sta,
3505                 .sdata = sta->sdata,
3506                 .local = sta->local,
3507                 /* This is OK -- must be QoS data frame */
3508                 .security_idx = tid,
3509                 .seqno_idx = tid,
3510                 .napi = NULL, /* must be NULL to not have races */
3511         };
3512         struct tid_ampdu_rx *tid_agg_rx;
3513
3514         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3515         if (!tid_agg_rx)
3516                 return;
3517
3518         __skb_queue_head_init(&frames);
3519
3520         spin_lock(&tid_agg_rx->reorder_lock);
3521         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3522         spin_unlock(&tid_agg_rx->reorder_lock);
3523
3524         if (!skb_queue_empty(&frames)) {
3525                 struct ieee80211_event event = {
3526                         .type = BA_FRAME_TIMEOUT,
3527                         .u.ba.tid = tid,
3528                         .u.ba.sta = &sta->sta,
3529                 };
3530                 drv_event_callback(rx.local, rx.sdata, &event);
3531         }
3532
3533         ieee80211_rx_handlers(&rx, &frames);
3534 }
3535
3536 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3537                                           u16 ssn, u64 filtered,
3538                                           u16 received_mpdus)
3539 {
3540         struct sta_info *sta;
3541         struct tid_ampdu_rx *tid_agg_rx;
3542         struct sk_buff_head frames;
3543         struct ieee80211_rx_data rx = {
3544                 /* This is OK -- must be QoS data frame */
3545                 .security_idx = tid,
3546                 .seqno_idx = tid,
3547         };
3548         int i, diff;
3549
3550         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3551                 return;
3552
3553         __skb_queue_head_init(&frames);
3554
3555         sta = container_of(pubsta, struct sta_info, sta);
3556
3557         rx.sta = sta;
3558         rx.sdata = sta->sdata;
3559         rx.local = sta->local;
3560
3561         rcu_read_lock();
3562         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3563         if (!tid_agg_rx)
3564                 goto out;
3565
3566         spin_lock_bh(&tid_agg_rx->reorder_lock);
3567
3568         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3569                 int release;
3570
3571                 /* release all frames in the reorder buffer */
3572                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3573                            IEEE80211_SN_MODULO;
3574                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3575                                                  release, &frames);
3576                 /* update ssn to match received ssn */
3577                 tid_agg_rx->head_seq_num = ssn;
3578         } else {
3579                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3580                                                  &frames);
3581         }
3582
3583         /* handle the case that received ssn is behind the mac ssn.
3584          * it can be tid_agg_rx->buf_size behind and still be valid */
3585         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3586         if (diff >= tid_agg_rx->buf_size) {
3587                 tid_agg_rx->reorder_buf_filtered = 0;
3588                 goto release;
3589         }
3590         filtered = filtered >> diff;
3591         ssn += diff;
3592
3593         /* update bitmap */
3594         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3595                 int index = (ssn + i) % tid_agg_rx->buf_size;
3596
3597                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3598                 if (filtered & BIT_ULL(i))
3599                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3600         }
3601
3602         /* now process also frames that the filter marking released */
3603         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3604
3605 release:
3606         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3607
3608         ieee80211_rx_handlers(&rx, &frames);
3609
3610  out:
3611         rcu_read_unlock();
3612 }
3613 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3614
3615 /* main receive path */
3616
3617 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3618 {
3619         struct ieee80211_sub_if_data *sdata = rx->sdata;
3620         struct sk_buff *skb = rx->skb;
3621         struct ieee80211_hdr *hdr = (void *)skb->data;
3622         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3623         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3624         bool multicast = is_multicast_ether_addr(hdr->addr1);
3625
3626         switch (sdata->vif.type) {
3627         case NL80211_IFTYPE_STATION:
3628                 if (!bssid && !sdata->u.mgd.use_4addr)
3629                         return false;
3630                 if (multicast)
3631                         return true;
3632                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3633         case NL80211_IFTYPE_ADHOC:
3634                 if (!bssid)
3635                         return false;
3636                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3637                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3638                         return false;
3639                 if (ieee80211_is_beacon(hdr->frame_control))
3640                         return true;
3641                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3642                         return false;
3643                 if (!multicast &&
3644                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3645                         return false;
3646                 if (!rx->sta) {
3647                         int rate_idx;
3648                         if (status->encoding != RX_ENC_LEGACY)
3649                                 rate_idx = 0; /* TODO: HT/VHT rates */
3650                         else
3651                                 rate_idx = status->rate_idx;
3652                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3653                                                  BIT(rate_idx));
3654                 }
3655                 return true;
3656         case NL80211_IFTYPE_OCB:
3657                 if (!bssid)
3658                         return false;
3659                 if (!ieee80211_is_data_present(hdr->frame_control))
3660                         return false;
3661                 if (!is_broadcast_ether_addr(bssid))
3662                         return false;
3663                 if (!multicast &&
3664                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3665                         return false;
3666                 if (!rx->sta) {
3667                         int rate_idx;
3668                         if (status->encoding != RX_ENC_LEGACY)
3669                                 rate_idx = 0; /* TODO: HT rates */
3670                         else
3671                                 rate_idx = status->rate_idx;
3672                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3673                                                 BIT(rate_idx));
3674                 }
3675                 return true;
3676         case NL80211_IFTYPE_MESH_POINT:
3677                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3678                         return false;
3679                 if (multicast)
3680                         return true;
3681                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3682         case NL80211_IFTYPE_AP_VLAN:
3683         case NL80211_IFTYPE_AP:
3684                 if (!bssid)
3685                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3686
3687                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3688                         /*
3689                          * Accept public action frames even when the
3690                          * BSSID doesn't match, this is used for P2P
3691                          * and location updates. Note that mac80211
3692                          * itself never looks at these frames.
3693                          */
3694                         if (!multicast &&
3695                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3696                                 return false;
3697                         if (ieee80211_is_public_action(hdr, skb->len))
3698                                 return true;
3699                         return ieee80211_is_beacon(hdr->frame_control);
3700                 }
3701
3702                 if (!ieee80211_has_tods(hdr->frame_control)) {
3703                         /* ignore data frames to TDLS-peers */
3704                         if (ieee80211_is_data(hdr->frame_control))
3705                                 return false;
3706                         /* ignore action frames to TDLS-peers */
3707                         if (ieee80211_is_action(hdr->frame_control) &&
3708                             !is_broadcast_ether_addr(bssid) &&
3709                             !ether_addr_equal(bssid, hdr->addr1))
3710                                 return false;
3711                 }
3712
3713                 /*
3714                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3715                  * the BSSID - we've checked that already but may have accepted
3716                  * the wildcard (ff:ff:ff:ff:ff:ff).
3717                  *
3718                  * It also says:
3719                  *      The BSSID of the Data frame is determined as follows:
3720                  *      a) If the STA is contained within an AP or is associated
3721                  *         with an AP, the BSSID is the address currently in use
3722                  *         by the STA contained in the AP.
3723                  *
3724                  * So we should not accept data frames with an address that's
3725                  * multicast.
3726                  *
3727                  * Accepting it also opens a security problem because stations
3728                  * could encrypt it with the GTK and inject traffic that way.
3729                  */
3730                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3731                         return false;
3732
3733                 return true;
3734         case NL80211_IFTYPE_WDS:
3735                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3736                         return false;
3737                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3738         case NL80211_IFTYPE_P2P_DEVICE:
3739                 return ieee80211_is_public_action(hdr, skb->len) ||
3740                        ieee80211_is_probe_req(hdr->frame_control) ||
3741                        ieee80211_is_probe_resp(hdr->frame_control) ||
3742                        ieee80211_is_beacon(hdr->frame_control);
3743         case NL80211_IFTYPE_NAN:
3744                 /* Currently no frames on NAN interface are allowed */
3745                 return false;
3746         default:
3747                 break;
3748         }
3749
3750         WARN_ON_ONCE(1);
3751         return false;
3752 }
3753
3754 void ieee80211_check_fast_rx(struct sta_info *sta)
3755 {
3756         struct ieee80211_sub_if_data *sdata = sta->sdata;
3757         struct ieee80211_local *local = sdata->local;
3758         struct ieee80211_key *key;
3759         struct ieee80211_fast_rx fastrx = {
3760                 .dev = sdata->dev,
3761                 .vif_type = sdata->vif.type,
3762                 .control_port_protocol = sdata->control_port_protocol,
3763         }, *old, *new = NULL;
3764         bool assign = false;
3765
3766         /* use sparse to check that we don't return without updating */
3767         __acquire(check_fast_rx);
3768
3769         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3770         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3771         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3772         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3773
3774         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3775
3776         /* fast-rx doesn't do reordering */
3777         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3778             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3779                 goto clear;
3780
3781         switch (sdata->vif.type) {
3782         case NL80211_IFTYPE_STATION:
3783                 if (sta->sta.tdls) {
3784                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3785                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3786                         fastrx.expected_ds_bits = 0;
3787                 } else {
3788                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3789                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3790                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3791                         fastrx.expected_ds_bits =
3792                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3793                 }
3794
3795                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3796                         fastrx.expected_ds_bits |=
3797                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3798                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3799                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3800                 }
3801
3802                 if (!sdata->u.mgd.powersave)
3803                         break;
3804
3805                 /* software powersave is a huge mess, avoid all of it */
3806                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3807                         goto clear;
3808                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3809                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3810                         goto clear;
3811                 break;
3812         case NL80211_IFTYPE_AP_VLAN:
3813         case NL80211_IFTYPE_AP:
3814                 /* parallel-rx requires this, at least with calls to
3815                  * ieee80211_sta_ps_transition()
3816                  */
3817                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3818                         goto clear;
3819                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3820                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3821                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3822
3823                 fastrx.internal_forward =
3824                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3825                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3826                          !sdata->u.vlan.sta);
3827
3828                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3829                     sdata->u.vlan.sta) {
3830                         fastrx.expected_ds_bits |=
3831                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3832                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3833                         fastrx.internal_forward = 0;
3834                 }
3835
3836                 break;
3837         default:
3838                 goto clear;
3839         }
3840
3841         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3842                 goto clear;
3843
3844         rcu_read_lock();
3845         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3846         if (key) {
3847                 switch (key->conf.cipher) {
3848                 case WLAN_CIPHER_SUITE_TKIP:
3849                         /* we don't want to deal with MMIC in fast-rx */
3850                         goto clear_rcu;
3851                 case WLAN_CIPHER_SUITE_CCMP:
3852                 case WLAN_CIPHER_SUITE_CCMP_256:
3853                 case WLAN_CIPHER_SUITE_GCMP:
3854                 case WLAN_CIPHER_SUITE_GCMP_256:
3855                         break;
3856                 default:
3857                         /* we also don't want to deal with WEP or cipher scheme
3858                          * since those require looking up the key idx in the
3859                          * frame, rather than assuming the PTK is used
3860                          * (we need to revisit this once we implement the real
3861                          * PTK index, which is now valid in the spec, but we
3862                          * haven't implemented that part yet)
3863                          */
3864                         goto clear_rcu;
3865                 }
3866
3867                 fastrx.key = true;
3868                 fastrx.icv_len = key->conf.icv_len;
3869         }
3870
3871         assign = true;
3872  clear_rcu:
3873         rcu_read_unlock();
3874  clear:
3875         __release(check_fast_rx);
3876
3877         if (assign)
3878                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3879
3880         spin_lock_bh(&sta->lock);
3881         old = rcu_dereference_protected(sta->fast_rx, true);
3882         rcu_assign_pointer(sta->fast_rx, new);
3883         spin_unlock_bh(&sta->lock);
3884
3885         if (old)
3886                 kfree_rcu(old, rcu_head);
3887 }
3888
3889 void ieee80211_clear_fast_rx(struct sta_info *sta)
3890 {
3891         struct ieee80211_fast_rx *old;
3892
3893         spin_lock_bh(&sta->lock);
3894         old = rcu_dereference_protected(sta->fast_rx, true);
3895         RCU_INIT_POINTER(sta->fast_rx, NULL);
3896         spin_unlock_bh(&sta->lock);
3897
3898         if (old)
3899                 kfree_rcu(old, rcu_head);
3900 }
3901
3902 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3903 {
3904         struct ieee80211_local *local = sdata->local;
3905         struct sta_info *sta;
3906
3907         lockdep_assert_held(&local->sta_mtx);
3908
3909         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3910                 if (sdata != sta->sdata &&
3911                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3912                         continue;
3913                 ieee80211_check_fast_rx(sta);
3914         }
3915 }
3916
3917 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3918 {
3919         struct ieee80211_local *local = sdata->local;
3920
3921         mutex_lock(&local->sta_mtx);
3922         __ieee80211_check_fast_rx_iface(sdata);
3923         mutex_unlock(&local->sta_mtx);
3924 }
3925
3926 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3927                                      struct ieee80211_fast_rx *fast_rx)
3928 {
3929         struct sk_buff *skb = rx->skb;
3930         struct ieee80211_hdr *hdr = (void *)skb->data;
3931         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3932         struct sta_info *sta = rx->sta;
3933         int orig_len = skb->len;
3934         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3935         int snap_offs = hdrlen;
3936         struct {
3937                 u8 snap[sizeof(rfc1042_header)];
3938                 __be16 proto;
3939         } *payload __aligned(2);
3940         struct {
3941                 u8 da[ETH_ALEN];
3942                 u8 sa[ETH_ALEN];
3943         } addrs __aligned(2);
3944         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3945
3946         if (fast_rx->uses_rss)
3947                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3948
3949         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3950          * to a common data structure; drivers can implement that per queue
3951          * but we don't have that information in mac80211
3952          */
3953         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3954                 return false;
3955
3956 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3957
3958         /* If using encryption, we also need to have:
3959          *  - PN_VALIDATED: similar, but the implementation is tricky
3960          *  - DECRYPTED: necessary for PN_VALIDATED
3961          */
3962         if (fast_rx->key &&
3963             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3964                 return false;
3965
3966         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3967                 return false;
3968
3969         if (unlikely(ieee80211_is_frag(hdr)))
3970                 return false;
3971
3972         /* Since our interface address cannot be multicast, this
3973          * implicitly also rejects multicast frames without the
3974          * explicit check.
3975          *
3976          * We shouldn't get any *data* frames not addressed to us
3977          * (AP mode will accept multicast *management* frames), but
3978          * punting here will make it go through the full checks in
3979          * ieee80211_accept_frame().
3980          */
3981         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3982                 return false;
3983
3984         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3985                                               IEEE80211_FCTL_TODS)) !=
3986             fast_rx->expected_ds_bits)
3987                 return false;
3988
3989         /* assign the key to drop unencrypted frames (later)
3990          * and strip the IV/MIC if necessary
3991          */
3992         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3993                 /* GCMP header length is the same */
3994                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3995         }
3996
3997         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
3998                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3999                         goto drop;
4000
4001                 payload = (void *)(skb->data + snap_offs);
4002
4003                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4004                         return false;
4005
4006                 /* Don't handle these here since they require special code.
4007                  * Accept AARP and IPX even though they should come with a
4008                  * bridge-tunnel header - but if we get them this way then
4009                  * there's little point in discarding them.
4010                  */
4011                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4012                              payload->proto == fast_rx->control_port_protocol))
4013                         return false;
4014         }
4015
4016         /* after this point, don't punt to the slowpath! */
4017
4018         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4019             pskb_trim(skb, skb->len - fast_rx->icv_len))
4020                 goto drop;
4021
4022         if (unlikely(fast_rx->sta_notify)) {
4023                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4024                 fast_rx->sta_notify = false;
4025         }
4026
4027         /* statistics part of ieee80211_rx_h_sta_process() */
4028         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4029                 stats->last_signal = status->signal;
4030                 if (!fast_rx->uses_rss)
4031                         ewma_signal_add(&sta->rx_stats_avg.signal,
4032                                         -status->signal);
4033         }
4034
4035         if (status->chains) {
4036                 int i;
4037
4038                 stats->chains = status->chains;
4039                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4040                         int signal = status->chain_signal[i];
4041
4042                         if (!(status->chains & BIT(i)))
4043                                 continue;
4044
4045                         stats->chain_signal_last[i] = signal;
4046                         if (!fast_rx->uses_rss)
4047                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4048                                                 -signal);
4049                 }
4050         }
4051         /* end of statistics */
4052
4053         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4054                 goto drop;
4055
4056         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4057                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4058                     RX_QUEUED)
4059                         goto drop;
4060
4061                 return true;
4062         }
4063
4064         stats->last_rx = jiffies;
4065         stats->last_rate = sta_stats_encode_rate(status);
4066
4067         stats->fragments++;
4068         stats->packets++;
4069
4070         /* do the header conversion - first grab the addresses */
4071         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4072         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4073         /* remove the SNAP but leave the ethertype */
4074         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4075         /* push the addresses in front */
4076         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4077
4078         skb->dev = fast_rx->dev;
4079
4080         ieee80211_rx_stats(fast_rx->dev, skb->len);
4081
4082         /* The seqno index has the same property as needed
4083          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4084          * for non-QoS-data frames. Here we know it's a data
4085          * frame, so count MSDUs.
4086          */
4087         u64_stats_update_begin(&stats->syncp);
4088         stats->msdu[rx->seqno_idx]++;
4089         stats->bytes += orig_len;
4090         u64_stats_update_end(&stats->syncp);
4091
4092         if (fast_rx->internal_forward) {
4093                 struct sk_buff *xmit_skb = NULL;
4094                 bool multicast = is_multicast_ether_addr(skb->data);
4095
4096                 if (multicast) {
4097                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4098                 } else if (sta_info_get(rx->sdata, skb->data)) {
4099                         xmit_skb = skb;
4100                         skb = NULL;
4101                 }
4102
4103                 if (xmit_skb) {
4104                         /*
4105                          * Send to wireless media and increase priority by 256
4106                          * to keep the received priority instead of
4107                          * reclassifying the frame (see cfg80211_classify8021d).
4108                          */
4109                         xmit_skb->priority += 256;
4110                         xmit_skb->protocol = htons(ETH_P_802_3);
4111                         skb_reset_network_header(xmit_skb);
4112                         skb_reset_mac_header(xmit_skb);
4113                         dev_queue_xmit(xmit_skb);
4114                 }
4115
4116                 if (!skb)
4117                         return true;
4118         }
4119
4120         /* deliver to local stack */
4121         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4122         memset(skb->cb, 0, sizeof(skb->cb));
4123         if (rx->napi)
4124                 napi_gro_receive(rx->napi, skb);
4125         else
4126                 netif_receive_skb(skb);
4127
4128         return true;
4129  drop:
4130         dev_kfree_skb(skb);
4131         stats->dropped++;
4132         return true;
4133 }
4134
4135 /*
4136  * This function returns whether or not the SKB
4137  * was destined for RX processing or not, which,
4138  * if consume is true, is equivalent to whether
4139  * or not the skb was consumed.
4140  */
4141 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4142                                             struct sk_buff *skb, bool consume)
4143 {
4144         struct ieee80211_local *local = rx->local;
4145         struct ieee80211_sub_if_data *sdata = rx->sdata;
4146
4147         rx->skb = skb;
4148
4149         /* See if we can do fast-rx; if we have to copy we already lost,
4150          * so punt in that case. We should never have to deliver a data
4151          * frame to multiple interfaces anyway.
4152          *
4153          * We skip the ieee80211_accept_frame() call and do the necessary
4154          * checking inside ieee80211_invoke_fast_rx().
4155          */
4156         if (consume && rx->sta) {
4157                 struct ieee80211_fast_rx *fast_rx;
4158
4159                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4160                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4161                         return true;
4162         }
4163
4164         if (!ieee80211_accept_frame(rx))
4165                 return false;
4166
4167         if (!consume) {
4168                 skb = skb_copy(skb, GFP_ATOMIC);
4169                 if (!skb) {
4170                         if (net_ratelimit())
4171                                 wiphy_debug(local->hw.wiphy,
4172                                         "failed to copy skb for %s\n",
4173                                         sdata->name);
4174                         return true;
4175                 }
4176
4177                 rx->skb = skb;
4178         }
4179
4180         ieee80211_invoke_rx_handlers(rx);
4181         return true;
4182 }
4183
4184 /*
4185  * This is the actual Rx frames handler. as it belongs to Rx path it must
4186  * be called with rcu_read_lock protection.
4187  */
4188 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4189                                          struct ieee80211_sta *pubsta,
4190                                          struct sk_buff *skb,
4191                                          struct napi_struct *napi)
4192 {
4193         struct ieee80211_local *local = hw_to_local(hw);
4194         struct ieee80211_sub_if_data *sdata;
4195         struct ieee80211_hdr *hdr;
4196         __le16 fc;
4197         struct ieee80211_rx_data rx;
4198         struct ieee80211_sub_if_data *prev;
4199         struct rhlist_head *tmp;
4200         int err = 0;
4201
4202         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4203         memset(&rx, 0, sizeof(rx));
4204         rx.skb = skb;
4205         rx.local = local;
4206         rx.napi = napi;
4207
4208         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4209                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4210
4211         if (ieee80211_is_mgmt(fc)) {
4212                 /* drop frame if too short for header */
4213                 if (skb->len < ieee80211_hdrlen(fc))
4214                         err = -ENOBUFS;
4215                 else
4216                         err = skb_linearize(skb);
4217         } else {
4218                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4219         }
4220
4221         if (err) {
4222                 dev_kfree_skb(skb);
4223                 return;
4224         }
4225
4226         hdr = (struct ieee80211_hdr *)skb->data;
4227         ieee80211_parse_qos(&rx);
4228         ieee80211_verify_alignment(&rx);
4229
4230         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4231                      ieee80211_is_beacon(hdr->frame_control)))
4232                 ieee80211_scan_rx(local, skb);
4233
4234         if (ieee80211_is_data(fc)) {
4235                 struct sta_info *sta, *prev_sta;
4236
4237                 if (pubsta) {
4238                         rx.sta = container_of(pubsta, struct sta_info, sta);
4239                         rx.sdata = rx.sta->sdata;
4240                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4241                                 return;
4242                         goto out;
4243                 }
4244
4245                 prev_sta = NULL;
4246
4247                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4248                         if (!prev_sta) {
4249                                 prev_sta = sta;
4250                                 continue;
4251                         }
4252
4253                         rx.sta = prev_sta;
4254                         rx.sdata = prev_sta->sdata;
4255                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4256
4257                         prev_sta = sta;
4258                 }
4259
4260                 if (prev_sta) {
4261                         rx.sta = prev_sta;
4262                         rx.sdata = prev_sta->sdata;
4263
4264                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4265                                 return;
4266                         goto out;
4267                 }
4268         }
4269
4270         prev = NULL;
4271
4272         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4273                 if (!ieee80211_sdata_running(sdata))
4274                         continue;
4275
4276                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4277                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4278                         continue;
4279
4280                 /*
4281                  * frame is destined for this interface, but if it's
4282                  * not also for the previous one we handle that after
4283                  * the loop to avoid copying the SKB once too much
4284                  */
4285
4286                 if (!prev) {
4287                         prev = sdata;
4288                         continue;
4289                 }
4290
4291                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4292                 rx.sdata = prev;
4293                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4294
4295                 prev = sdata;
4296         }
4297
4298         if (prev) {
4299                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4300                 rx.sdata = prev;
4301
4302                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4303                         return;
4304         }
4305
4306  out:
4307         dev_kfree_skb(skb);
4308 }
4309
4310 /*
4311  * This is the receive path handler. It is called by a low level driver when an
4312  * 802.11 MPDU is received from the hardware.
4313  */
4314 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4315                        struct sk_buff *skb, struct napi_struct *napi)
4316 {
4317         struct ieee80211_local *local = hw_to_local(hw);
4318         struct ieee80211_rate *rate = NULL;
4319         struct ieee80211_supported_band *sband;
4320         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4321
4322         WARN_ON_ONCE(softirq_count() == 0);
4323
4324         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4325                 goto drop;
4326
4327         sband = local->hw.wiphy->bands[status->band];
4328         if (WARN_ON(!sband))
4329                 goto drop;
4330
4331         /*
4332          * If we're suspending, it is possible although not too likely
4333          * that we'd be receiving frames after having already partially
4334          * quiesced the stack. We can't process such frames then since
4335          * that might, for example, cause stations to be added or other
4336          * driver callbacks be invoked.
4337          */
4338         if (unlikely(local->quiescing || local->suspended))
4339                 goto drop;
4340
4341         /* We might be during a HW reconfig, prevent Rx for the same reason */
4342         if (unlikely(local->in_reconfig))
4343                 goto drop;
4344
4345         /*
4346          * The same happens when we're not even started,
4347          * but that's worth a warning.
4348          */
4349         if (WARN_ON(!local->started))
4350                 goto drop;
4351
4352         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4353                 /*
4354                  * Validate the rate, unless a PLCP error means that
4355                  * we probably can't have a valid rate here anyway.
4356                  */
4357
4358                 switch (status->encoding) {
4359                 case RX_ENC_HT:
4360                         /*
4361                          * rate_idx is MCS index, which can be [0-76]
4362                          * as documented on:
4363                          *
4364                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4365                          *
4366                          * Anything else would be some sort of driver or
4367                          * hardware error. The driver should catch hardware
4368                          * errors.
4369                          */
4370                         if (WARN(status->rate_idx > 76,
4371                                  "Rate marked as an HT rate but passed "
4372                                  "status->rate_idx is not "
4373                                  "an MCS index [0-76]: %d (0x%02x)\n",
4374                                  status->rate_idx,
4375                                  status->rate_idx))
4376                                 goto drop;
4377                         break;
4378                 case RX_ENC_VHT:
4379                         if (WARN_ONCE(status->rate_idx > 9 ||
4380                                       !status->nss ||
4381                                       status->nss > 8,
4382                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4383                                       status->rate_idx, status->nss))
4384                                 goto drop;
4385                         break;
4386                 default:
4387                         WARN_ON_ONCE(1);
4388                         /* fall through */
4389                 case RX_ENC_LEGACY:
4390                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4391                                 goto drop;
4392                         rate = &sband->bitrates[status->rate_idx];
4393                 }
4394         }
4395
4396         status->rx_flags = 0;
4397
4398         /*
4399          * key references and virtual interfaces are protected using RCU
4400          * and this requires that we are in a read-side RCU section during
4401          * receive processing
4402          */
4403         rcu_read_lock();
4404
4405         /*
4406          * Frames with failed FCS/PLCP checksum are not returned,
4407          * all other frames are returned without radiotap header
4408          * if it was previously present.
4409          * Also, frames with less than 16 bytes are dropped.
4410          */
4411         skb = ieee80211_rx_monitor(local, skb, rate);
4412         if (!skb) {
4413                 rcu_read_unlock();
4414                 return;
4415         }
4416
4417         ieee80211_tpt_led_trig_rx(local,
4418                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4419                         skb->len);
4420
4421         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4422
4423         rcu_read_unlock();
4424
4425         return;
4426  drop:
4427         kfree_skb(skb);
4428 }
4429 EXPORT_SYMBOL(ieee80211_rx_napi);
4430
4431 /* This is a version of the rx handler that can be called from hard irq
4432  * context. Post the skb on the queue and schedule the tasklet */
4433 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4434 {
4435         struct ieee80211_local *local = hw_to_local(hw);
4436
4437         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4438
4439         skb->pkt_type = IEEE80211_RX_MSG;
4440         skb_queue_tail(&local->skb_queue, skb);
4441         tasklet_schedule(&local->tasklet);
4442 }
4443 EXPORT_SYMBOL(ieee80211_rx_irqsafe);