net/mac80211/rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   9  * Copyright (C) 2018-2023 Intel Corporation
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/export.h>
  20 #include <linux/kcov.h>
  21 #include <linux/bitops.h>
  22 #include <kunit/visibility.h>
  23 #include <net/mac80211.h>
  24 #include <net/ieee80211_radiotap.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "led.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wpa.h"
  33 #include "tkip.h"
  34 #include "wme.h"
  35 #include "rate.h"
  36
  37 /*
  38  * monitor mode reception
  39  *
  40  * This function cleans up the SKB, i.e. it removes all the stuff
  41  * only useful for monitoring.
  42  */
  43 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
  44                                            unsigned int present_fcs_len,
  45                                            unsigned int rtap_space)
  46 {
  47         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  48         struct ieee80211_hdr *hdr;
  49         unsigned int hdrlen;
  50         __le16 fc;
  51
  52         if (present_fcs_len)
  53                 __pskb_trim(skb, skb->len - present_fcs_len);
  54         pskb_pull(skb, rtap_space);
  55
  56         /* After pulling radiotap header, clear all flags that indicate
  57          * info in skb->data.
  58          */
  59         status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END |
  60                           RX_FLAG_RADIOTAP_LSIG |
  61                           RX_FLAG_RADIOTAP_HE_MU |
  62                           RX_FLAG_RADIOTAP_HE);
  63
  64         hdr = (void *)skb->data;
  65         fc = hdr->frame_control;
  66
  67         /*
  68          * Remove the HT-Control field (if present) on management
  69          * frames after we've sent the frame to monitoring. We
  70          * (currently) don't need it, and don't properly parse
  71          * frames with it present, due to the assumption of a
  72          * fixed management header length.
  73          */
  74         if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
  75                 return skb;
  76
  77         hdrlen = ieee80211_hdrlen(fc);
  78         hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
  79
  80         if (!pskb_may_pull(skb, hdrlen)) {
  81                 dev_kfree_skb(skb);
  82                 return NULL;
  83         }
  84
  85         memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
  86                 hdrlen - IEEE80211_HT_CTL_LEN);
  87         pskb_pull(skb, IEEE80211_HT_CTL_LEN);
  88
  89         return skb;
  90 }
  91
  92 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
  93                                      unsigned int rtap_space)
  94 {
  95         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
  96         struct ieee80211_hdr *hdr;
  97
  98         hdr = (void *)(skb->data + rtap_space);
  99
 100         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 101                             RX_FLAG_FAILED_PLCP_CRC |
 102                             RX_FLAG_ONLY_MONITOR |
 103                             RX_FLAG_NO_PSDU))
 104                 return true;
 105
 106         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
 107                 return true;
 108
 109         if (ieee80211_is_ctl(hdr->frame_control) &&
 110             !ieee80211_is_pspoll(hdr->frame_control) &&
 111             !ieee80211_is_back_req(hdr->frame_control))
 112                 return true;
 113
 114         return false;
 115 }
 116
 117 static int
 118 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 119                              struct ieee80211_rx_status *status,
 120                              struct sk_buff *skb)
 121 {
 122         int len;
 123
 124         /* always present fields */
 125         len = sizeof(struct ieee80211_radiotap_header) + 8;
 126
 127         /* allocate extra bitmaps */
 128         if (status->chains)
 129                 len += 4 * hweight8(status->chains);
 130
 131         if (ieee80211_have_rx_timestamp(status)) {
 132                 len = ALIGN(len, 8);
 133                 len += 8;
 134         }
 135         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 136                 len += 1;
 137
 138         /* antenna field, if we don't have per-chain info */
 139         if (!status->chains)
 140                 len += 1;
 141
 142         /* padding for RX_FLAGS if necessary */
 143         len = ALIGN(len, 2);
 144
 145         if (status->encoding == RX_ENC_HT) /* HT info */
 146                 len += 3;
 147
 148         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 149                 len = ALIGN(len, 4);
 150                 len += 8;
 151         }
 152
 153         if (status->encoding == RX_ENC_VHT) {
 154                 len = ALIGN(len, 2);
 155                 len += 12;
 156         }
 157
 158         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 159                 len = ALIGN(len, 8);
 160                 len += 12;
 161         }
 162
 163         if (status->encoding == RX_ENC_HE &&
 164             status->flag & RX_FLAG_RADIOTAP_HE) {
 165                 len = ALIGN(len, 2);
 166                 len += 12;
 167                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
 168         }
 169
 170         if (status->encoding == RX_ENC_HE &&
 171             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 172                 len = ALIGN(len, 2);
 173                 len += 12;
 174                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
 175         }
 176
 177         if (status->flag & RX_FLAG_NO_PSDU)
 178                 len += 1;
 179
 180         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 181                 len = ALIGN(len, 2);
 182                 len += 4;
 183                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
 184         }
 185
 186         if (status->chains) {
 187                 /* antenna and antenna signal fields */
 188                 len += 2 * hweight8(status->chains);
 189         }
 190
 191         if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
 192                 int tlv_offset = 0;
 193
 194                 /*
 195                  * The position to look at depends on the existence (or non-
 196                  * existence) of other elements, so take that into account...
 197                  */
 198                 if (status->flag & RX_FLAG_RADIOTAP_HE)
 199                         tlv_offset +=
 200                                 sizeof(struct ieee80211_radiotap_he);
 201                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 202                         tlv_offset +=
 203                                 sizeof(struct ieee80211_radiotap_he_mu);
 204                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 205                         tlv_offset +=
 206                                 sizeof(struct ieee80211_radiotap_lsig);
 207
 208                 /* ensure 4 byte alignment for TLV */
 209                 len = ALIGN(len, 4);
 210
 211                 /* TLVs until the mac header */
 212                 len += skb_mac_header(skb) - &skb->data[tlv_offset];
 213         }
 214
 215         return len;
 216 }
 217
 218 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
 219                                            int link_id,
 220                                            struct sta_info *sta,
 221                                            struct sk_buff *skb)
 222 {
 223         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 224
 225         if (link_id >= 0) {
 226                 status->link_valid = 1;
 227                 status->link_id = link_id;
 228         } else {
 229                 status->link_valid = 0;
 230         }
 231
 232         skb_queue_tail(&sdata->skb_queue, skb);
 233         wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 234         if (sta)
 235                 sta->deflink.rx_stats.packets++;
 236 }
 237
 238 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
 239                                          int link_id,
 240                                          struct sta_info *sta,
 241                                          struct sk_buff *skb)
 242 {
 243         skb->protocol = 0;
 244         __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
 245 }
 246
 247 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
 248                                          struct sk_buff *skb,
 249                                          int rtap_space)
 250 {
 251         struct {
 252                 struct ieee80211_hdr_3addr hdr;
 253                 u8 category;
 254                 u8 action_code;
 255         } __packed __aligned(2) action;
 256
 257         if (!sdata)
 258                 return;
 259
 260         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
 261
 262         if (skb->len < rtap_space + sizeof(action) +
 263                        VHT_MUMIMO_GROUPS_DATA_LEN)
 264                 return;
 265
 266         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
 267                 return;
 268
 269         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
 270
 271         if (!ieee80211_is_action(action.hdr.frame_control))
 272                 return;
 273
 274         if (action.category != WLAN_CATEGORY_VHT)
 275                 return;
 276
 277         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
 278                 return;
 279
 280         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
 281                 return;
 282
 283         skb = skb_copy(skb, GFP_ATOMIC);
 284         if (!skb)
 285                 return;
 286
 287         ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
 288 }
 289
 290 /*
 291  * ieee80211_add_rx_radiotap_header - add radiotap header
 292  *
 293  * add a radiotap header containing all the fields which the hardware provided.
 294  */
 295 static void
 296 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 297                                  struct sk_buff *skb,
 298                                  struct ieee80211_rate *rate,
 299                                  int rtap_len, bool has_fcs)
 300 {
 301         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 302         struct ieee80211_radiotap_header *rthdr;
 303         unsigned char *pos;
 304         __le32 *it_present;
 305         u32 it_present_val;
 306         u16 rx_flags = 0;
 307         u16 channel_flags = 0;
 308         u32 tlvs_len = 0;
 309         int mpdulen, chain;
 310         unsigned long chains = status->chains;
 311         struct ieee80211_radiotap_he he = {};
 312         struct ieee80211_radiotap_he_mu he_mu = {};
 313         struct ieee80211_radiotap_lsig lsig = {};
 314
 315         if (status->flag & RX_FLAG_RADIOTAP_HE) {
 316                 he = *(struct ieee80211_radiotap_he *)skb->data;
 317                 skb_pull(skb, sizeof(he));
 318                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
 319         }
 320
 321         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 322                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
 323                 skb_pull(skb, sizeof(he_mu));
 324         }
 325
 326         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 327                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
 328                 skb_pull(skb, sizeof(lsig));
 329         }
 330
 331         if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
 332                 /* data is pointer at tlv all other info was pulled off */
 333                 tlvs_len = skb_mac_header(skb) - skb->data;
 334         }
 335
 336         mpdulen = skb->len;
 337         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
 338                 mpdulen += FCS_LEN;
 339
 340         rthdr = skb_push(skb, rtap_len - tlvs_len);
 341         memset(rthdr, 0, rtap_len - tlvs_len);
 342         it_present = &rthdr->it_present;
 343
 344         /* radiotap header, set always present flags */
 345         rthdr->it_len = cpu_to_le16(rtap_len);
 346         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
 347                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
 348                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
 349
 350         if (!status->chains)
 351                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
 352
 353         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 354                 it_present_val |=
 355                         BIT(IEEE80211_RADIOTAP_EXT) |
 356                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
 357                 put_unaligned_le32(it_present_val, it_present);
 358                 it_present++;
 359                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
 360                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 361         }
 362
 363         if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
 364                 it_present_val |= BIT(IEEE80211_RADIOTAP_TLV);
 365
 366         put_unaligned_le32(it_present_val, it_present);
 367
 368         /* This references through an offset into it_optional[] rather
 369          * than via it_present otherwise later uses of pos will cause
 370          * the compiler to think we have walked past the end of the
 371          * struct member.
 372          */
 373         pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
 374
 375         /* the order of the following fields is important */
 376
 377         /* IEEE80211_RADIOTAP_TSFT */
 378         if (ieee80211_have_rx_timestamp(status)) {
 379                 /* padding */
 380                 while ((pos - (u8 *)rthdr) & 7)
 381                         *pos++ = 0;
 382                 put_unaligned_le64(
 383                         ieee80211_calculate_rx_timestamp(local, status,
 384                                                          mpdulen, 0),
 385                         pos);
 386                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
 387                 pos += 8;
 388         }
 389
 390         /* IEEE80211_RADIOTAP_FLAGS */
 391         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
 392                 *pos |= IEEE80211_RADIOTAP_F_FCS;
 393         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
 394                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
 395         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
 396                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
 397         pos++;
 398
 399         /* IEEE80211_RADIOTAP_RATE */
 400         if (!rate || status->encoding != RX_ENC_LEGACY) {
 401                 /*
 402                  * Without rate information don't add it. If we have,
 403                  * MCS information is a separate field in radiotap,
 404                  * added below. The byte here is needed as padding
 405                  * for the channel though, so initialise it to 0.
 406                  */
 407                 *pos = 0;
 408         } else {
 409                 int shift = 0;
 410                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 411                 if (status->bw == RATE_INFO_BW_10)
 412                         shift = 1;
 413                 else if (status->bw == RATE_INFO_BW_5)
 414                         shift = 2;
 415                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
 416         }
 417         pos++;
 418
 419         /* IEEE80211_RADIOTAP_CHANNEL */
 420         /* TODO: frequency offset in KHz */
 421         put_unaligned_le16(status->freq, pos);
 422         pos += 2;
 423         if (status->bw == RATE_INFO_BW_10)
 424                 channel_flags |= IEEE80211_CHAN_HALF;
 425         else if (status->bw == RATE_INFO_BW_5)
 426                 channel_flags |= IEEE80211_CHAN_QUARTER;
 427
 428         if (status->band == NL80211_BAND_5GHZ ||
 429             status->band == NL80211_BAND_6GHZ)
 430                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
 431         else if (status->encoding != RX_ENC_LEGACY)
 432                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
 433         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
 434                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
 435         else if (rate)
 436                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
 437         else
 438                 channel_flags |= IEEE80211_CHAN_2GHZ;
 439         put_unaligned_le16(channel_flags, pos);
 440         pos += 2;
 441
 442         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
 443         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
 444             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 445                 *pos = status->signal;
 446                 rthdr->it_present |=
 447                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
 448                 pos++;
 449         }
 450
 451         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
 452
 453         if (!status->chains) {
 454                 /* IEEE80211_RADIOTAP_ANTENNA */
 455                 *pos = status->antenna;
 456                 pos++;
 457         }
 458
 459         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 460
 461         /* IEEE80211_RADIOTAP_RX_FLAGS */
 462         /* ensure 2 byte alignment for the 2 byte field as required */
 463         if ((pos - (u8 *)rthdr) & 1)
 464                 *pos++ = 0;
 465         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
 466                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
 467         put_unaligned_le16(rx_flags, pos);
 468         pos += 2;
 469
 470         if (status->encoding == RX_ENC_HT) {
 471                 unsigned int stbc;
 472
 473                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 474                 *pos = local->hw.radiotap_mcs_details;
 475                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 476                         *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
 477                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 478                         *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
 479                 pos++;
 480                 *pos = 0;
 481                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 482                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
 483                 if (status->bw == RATE_INFO_BW_40)
 484                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
 485                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
 486                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 487                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 488                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
 489                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
 490                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
 491                 pos++;
 492                 *pos++ = status->rate_idx;
 493         }
 494
 495         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
 496                 u16 flags = 0;
 497
 498                 /* ensure 4 byte alignment */
 499                 while ((pos - (u8 *)rthdr) & 3)
 500                         pos++;
 501                 rthdr->it_present |=
 502                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
 503                 put_unaligned_le32(status->ampdu_reference, pos);
 504                 pos += 4;
 505                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
 506                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
 507                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
 508                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
 509                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
 510                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
 511                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 512                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
 513                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
 514                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
 515                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
 516                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
 517                 put_unaligned_le16(flags, pos);
 518                 pos += 2;
 519                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
 520                         *pos++ = status->ampdu_delimiter_crc;
 521                 else
 522                         *pos++ = 0;
 523                 *pos++ = 0;
 524         }
 525
 526         if (status->encoding == RX_ENC_VHT) {
 527                 u16 known = local->hw.radiotap_vht_details;
 528
 529                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 530                 put_unaligned_le16(known, pos);
 531                 pos += 2;
 532                 /* flags */
 533                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
 534                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 535                 /* in VHT, STBC is binary */
 536                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
 537                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
 538                 if (status->enc_flags & RX_ENC_FLAG_BF)
 539                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 540                 pos++;
 541                 /* bandwidth */
 542                 switch (status->bw) {
 543                 case RATE_INFO_BW_80:
 544                         *pos++ = 4;
 545                         break;
 546                 case RATE_INFO_BW_160:
 547                         *pos++ = 11;
 548                         break;
 549                 case RATE_INFO_BW_40:
 550                         *pos++ = 1;
 551                         break;
 552                 default:
 553                         *pos++ = 0;
 554                 }
 555                 /* MCS/NSS */
 556                 *pos = (status->rate_idx << 4) | status->nss;
 557                 pos += 4;
 558                 /* coding field */
 559                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
 560                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
 561                 pos++;
 562                 /* group ID */
 563                 pos++;
 564                 /* partial_aid */
 565                 pos += 2;
 566         }
 567
 568         if (local->hw.radiotap_timestamp.units_pos >= 0) {
 569                 u16 accuracy = 0;
 570                 u8 flags;
 571                 u64 ts;
 572
 573                 rthdr->it_present |=
 574                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
 575
 576                 /* ensure 8 byte alignment */
 577                 while ((pos - (u8 *)rthdr) & 7)
 578                         pos++;
 579
 580                 if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) {
 581                         flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT;
 582                         ts = status->mactime;
 583                 } else {
 584                         flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
 585                         ts = status->device_timestamp;
 586                 }
 587
 588                 put_unaligned_le64(ts, pos);
 589                 pos += sizeof(u64);
 590
 591                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
 592                         accuracy = local->hw.radiotap_timestamp.accuracy;
 593                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
 594                 }
 595                 put_unaligned_le16(accuracy, pos);
 596                 pos += sizeof(u16);
 597
 598                 *pos++ = local->hw.radiotap_timestamp.units_pos;
 599                 *pos++ = flags;
 600         }
 601
 602         if (status->encoding == RX_ENC_HE &&
 603             status->flag & RX_FLAG_RADIOTAP_HE) {
 604 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 605
 606                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
 607                         he.data6 |= HE_PREP(DATA6_NSTS,
 608                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
 609                                                       status->enc_flags));
 610                         he.data3 |= HE_PREP(DATA3_STBC, 1);
 611                 } else {
 612                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
 613                 }
 614
 615 #define CHECK_GI(s) \
 616         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 617                      (int)NL80211_RATE_INFO_HE_GI_##s)
 618
 619                 CHECK_GI(0_8);
 620                 CHECK_GI(1_6);
 621                 CHECK_GI(3_2);
 622
 623                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
 624                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
 625                 he.data3 |= HE_PREP(DATA3_CODING,
 626                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
 627
 628                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
 629
 630                 switch (status->bw) {
 631                 case RATE_INFO_BW_20:
 632                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 633                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 634                         break;
 635                 case RATE_INFO_BW_40:
 636                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 637                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 638                         break;
 639                 case RATE_INFO_BW_80:
 640                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 641                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 642                         break;
 643                 case RATE_INFO_BW_160:
 644                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 645                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 646                         break;
 647                 case RATE_INFO_BW_HE_RU:
 648 #define CHECK_RU_ALLOC(s) \
 649         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 650                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 651
 652                         CHECK_RU_ALLOC(26);
 653                         CHECK_RU_ALLOC(52);
 654                         CHECK_RU_ALLOC(106);
 655                         CHECK_RU_ALLOC(242);
 656                         CHECK_RU_ALLOC(484);
 657                         CHECK_RU_ALLOC(996);
 658                         CHECK_RU_ALLOC(2x996);
 659
 660                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 661                                             status->he_ru + 4);
 662                         break;
 663                 default:
 664                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
 665                 }
 666
 667                 /* ensure 2 byte alignment */
 668                 while ((pos - (u8 *)rthdr) & 1)
 669                         pos++;
 670                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 671                 memcpy(pos, &he, sizeof(he));
 672                 pos += sizeof(he);
 673         }
 674
 675         if (status->encoding == RX_ENC_HE &&
 676             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
 677                 /* ensure 2 byte alignment */
 678                 while ((pos - (u8 *)rthdr) & 1)
 679                         pos++;
 680                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
 681                 memcpy(pos, &he_mu, sizeof(he_mu));
 682                 pos += sizeof(he_mu);
 683         }
 684
 685         if (status->flag & RX_FLAG_NO_PSDU) {
 686                 rthdr->it_present |=
 687                         cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
 688                 *pos++ = status->zero_length_psdu_type;
 689         }
 690
 691         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
 692                 /* ensure 2 byte alignment */
 693                 while ((pos - (u8 *)rthdr) & 1)
 694                         pos++;
 695                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
 696                 memcpy(pos, &lsig, sizeof(lsig));
 697                 pos += sizeof(lsig);
 698         }
 699
 700         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
 701                 *pos++ = status->chain_signal[chain];
 702                 *pos++ = chain;
 703         }
 704 }
 705
 706 static struct sk_buff *
 707 ieee80211_make_monitor_skb(struct ieee80211_local *local,
 708                            struct sk_buff **origskb,
 709                            struct ieee80211_rate *rate,
 710                            int rtap_space, bool use_origskb)
 711 {
 712         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
 713         int rt_hdrlen, needed_headroom;
 714         struct sk_buff *skb;
 715
 716         /* room for the radiotap header based on driver features */
 717         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
 718         needed_headroom = rt_hdrlen - rtap_space;
 719
 720         if (use_origskb) {
 721                 /* only need to expand headroom if necessary */
 722                 skb = *origskb;
 723                 *origskb = NULL;
 724
 725                 /*
 726                  * This shouldn't trigger often because most devices have an
 727                  * RX header they pull before we get here, and that should
 728                  * be big enough for our radiotap information. We should
 729                  * probably export the length to drivers so that we can have
 730                  * them allocate enough headroom to start with.
 731                  */
 732                 if (skb_headroom(skb) < needed_headroom &&
 733                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
 734                         dev_kfree_skb(skb);
 735                         return NULL;
 736                 }
 737         } else {
 738                 /*
 739                  * Need to make a copy and possibly remove radiotap header
 740                  * and FCS from the original.
 741                  */
 742                 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
 743                                       0, GFP_ATOMIC);
 744
 745                 if (!skb)
 746                         return NULL;
 747         }
 748
 749         /* prepend radiotap information */
 750         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
 751
 752         skb_reset_mac_header(skb);
 753         skb->ip_summed = CHECKSUM_UNNECESSARY;
 754         skb->pkt_type = PACKET_OTHERHOST;
 755         skb->protocol = htons(ETH_P_802_2);
 756
 757         return skb;
 758 }
 759
 760 /*
 761  * This function copies a received frame to all monitor interfaces and
 762  * returns a cleaned-up SKB that no longer includes the FCS nor the
 763  * radiotap header the driver might have added.
 764  */
 765 static struct sk_buff *
 766 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 767                      struct ieee80211_rate *rate)
 768 {
 769         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
 770         struct ieee80211_sub_if_data *sdata;
 771         struct sk_buff *monskb = NULL;
 772         int present_fcs_len = 0;
 773         unsigned int rtap_space = 0;
 774         struct ieee80211_sub_if_data *monitor_sdata =
 775                 rcu_dereference(local->monitor_sdata);
 776         bool only_monitor = false;
 777         unsigned int min_head_len;
 778
 779         if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END &&
 780                          !skb_mac_header_was_set(origskb))) {
 781                 /* with this skb no way to know where frame payload starts */
 782                 dev_kfree_skb(origskb);
 783                 return NULL;
 784         }
 785
 786         if (status->flag & RX_FLAG_RADIOTAP_HE)
 787                 rtap_space += sizeof(struct ieee80211_radiotap_he);
 788
 789         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
 790                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
 791
 792         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
 793                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
 794
 795         if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
 796                 rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space];
 797
 798         min_head_len = rtap_space;
 799
 800         /*
 801          * First, we may need to make a copy of the skb because
 802          *  (1) we need to modify it for radiotap (if not present), and
 803          *  (2) the other RX handlers will modify the skb we got.
 804          *
 805          * We don't need to, of course, if we aren't going to return
 806          * the SKB because it has a bad FCS/PLCP checksum.
 807          */
 808
 809         if (!(status->flag & RX_FLAG_NO_PSDU)) {
 810                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
 811                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
 812                                 /* driver bug */
 813                                 WARN_ON(1);
 814                                 dev_kfree_skb(origskb);
 815                                 return NULL;
 816                         }
 817                         present_fcs_len = FCS_LEN;
 818                 }
 819
 820                 /* also consider the hdr->frame_control */
 821                 min_head_len += 2;
 822         }
 823
 824         /* ensure that the expected data elements are in skb head */
 825         if (!pskb_may_pull(origskb, min_head_len)) {
 826                 dev_kfree_skb(origskb);
 827                 return NULL;
 828         }
 829
 830         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
 831
 832         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
 833                 if (only_monitor) {
 834                         dev_kfree_skb(origskb);
 835                         return NULL;
 836                 }
 837
 838                 return ieee80211_clean_skb(origskb, present_fcs_len,
 839                                            rtap_space);
 840         }
 841
 842         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
 843
 844         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
 845                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
 846                                                  &local->mon_list);
 847
 848                 if (!monskb)
 849                         monskb = ieee80211_make_monitor_skb(local, &origskb,
 850                                                             rate, rtap_space,
 851                                                             only_monitor &&
 852                                                             last_monitor);
 853
 854                 if (monskb) {
 855                         struct sk_buff *skb;
 856
 857                         if (last_monitor) {
 858                                 skb = monskb;
 859                                 monskb = NULL;
 860                         } else {
 861                                 skb = skb_clone(monskb, GFP_ATOMIC);
 862                         }
 863
 864                         if (skb) {
 865                                 skb->dev = sdata->dev;
 866                                 dev_sw_netstats_rx_add(skb->dev, skb->len);
 867                                 netif_receive_skb(skb);
 868                         }
 869                 }
 870
 871                 if (last_monitor)
 872                         break;
 873         }
 874
 875         /* this happens if last_monitor was erroneously false */
 876         dev_kfree_skb(monskb);
 877
 878         /* ditto */
 879         if (!origskb)
 880                 return NULL;
 881
 882         return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
 883 }
 884
 885 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
 886 {
 887         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 888         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
 889         int tid, seqno_idx, security_idx;
 890
 891         /* does the frame have a qos control field? */
 892         if (ieee80211_is_data_qos(hdr->frame_control)) {
 893                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 894                 /* frame has qos control */
 895                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 896                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
 897                         status->rx_flags |= IEEE80211_RX_AMSDU;
 898
 899                 seqno_idx = tid;
 900                 security_idx = tid;
 901         } else {
 902                 /*
 903                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
 904                  *
 905                  *      Sequence numbers for management frames, QoS data
 906                  *      frames with a broadcast/multicast address in the
 907                  *      Address 1 field, and all non-QoS data frames sent
 908                  *      by QoS STAs are assigned using an additional single
 909                  *      modulo-4096 counter, [...]
 910                  *
 911                  * We also use that counter for non-QoS STAs.
 912                  */
 913                 seqno_idx = IEEE80211_NUM_TIDS;
 914                 security_idx = 0;
 915                 if (ieee80211_is_mgmt(hdr->frame_control))
 916                         security_idx = IEEE80211_NUM_TIDS;
 917                 tid = 0;
 918         }
 919
 920         rx->seqno_idx = seqno_idx;
 921         rx->security_idx = security_idx;
 922         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
 923          * For now, set skb->priority to 0 for other cases. */
 924         rx->skb->priority = (tid > 7) ? 0 : tid;
 925 }
 926
 927 /**
 928  * DOC: Packet alignment
 929  *
 930  * Drivers always need to pass packets that are aligned to two-byte boundaries
 931  * to the stack.
 932  *
 933  * Additionally, they should, if possible, align the payload data in a way that
 934  * guarantees that the contained IP header is aligned to a four-byte
 935  * boundary. In the case of regular frames, this simply means aligning the
 936  * payload to a four-byte boundary (because either the IP header is directly
 937  * contained, or IV/RFC1042 headers that have a length divisible by four are
 938  * in front of it).  If the payload data is not properly aligned and the
 939  * architecture doesn't support efficient unaligned operations, mac80211
 940  * will align the data.
 941  *
 942  * With A-MSDU frames, however, the payload data address must yield two modulo
 943  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 944  * push the IP header further back to a multiple of four again. Thankfully, the
 945  * specs were sane enough this time around to require padding each A-MSDU
 946  * subframe to a length that is a multiple of four.
 947  *
 948  * Padding like Atheros hardware adds which is between the 802.11 header and
 949  * the payload is not supported; the driver is required to move the 802.11
 950  * header to be directly in front of the payload in that case.
 951  */
 952 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
 953 {
 954 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 955         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
 956 #endif
 957 }
 958
 959
 960 /* rx handlers */
 961
 962 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
 963 {
 964         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 965
 966         if (is_multicast_ether_addr(hdr->addr1))
 967                 return 0;
 968
 969         return ieee80211_is_robust_mgmt_frame(skb);
 970 }
 971
 972
 973 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
 974 {
 975         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 976
 977         if (!is_multicast_ether_addr(hdr->addr1))
 978                 return 0;
 979
 980         return ieee80211_is_robust_mgmt_frame(skb);
 981 }
 982
 983
 984 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
 985 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 986 {
 987         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
 988         struct ieee80211_mmie *mmie;
 989         struct ieee80211_mmie_16 *mmie16;
 990
 991         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
 992                 return -1;
 993
 994         if (!ieee80211_is_robust_mgmt_frame(skb) &&
 995             !ieee80211_is_beacon(hdr->frame_control))
 996                 return -1; /* not a robust management frame */
 997
 998         mmie = (struct ieee80211_mmie *)
 999                 (skb->data + skb->len - sizeof(*mmie));
1000         if (mmie->element_id == WLAN_EID_MMIE &&
1001             mmie->length == sizeof(*mmie) - 2)
1002                 return le16_to_cpu(mmie->key_id);
1003
1004         mmie16 = (struct ieee80211_mmie_16 *)
1005                 (skb->data + skb->len - sizeof(*mmie16));
1006         if (skb->len >= 24 + sizeof(*mmie16) &&
1007             mmie16->element_id == WLAN_EID_MMIE &&
1008             mmie16->length == sizeof(*mmie16) - 2)
1009                 return le16_to_cpu(mmie16->key_id);
1010
1011         return -1;
1012 }
1013
1014 static int ieee80211_get_keyid(struct sk_buff *skb)
1015 {
1016         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1017         __le16 fc = hdr->frame_control;
1018         int hdrlen = ieee80211_hdrlen(fc);
1019         u8 keyid;
1020
1021         /* WEP, TKIP, CCMP and GCMP */
1022         if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
1023                 return -EINVAL;
1024
1025         skb_copy_bits(skb, hdrlen + 3, &keyid, 1);
1026
1027         keyid >>= 6;
1028
1029         return keyid;
1030 }
1031
1032 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1033 {
1034         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1035         char *dev_addr = rx->sdata->vif.addr;
1036
1037         if (ieee80211_is_data(hdr->frame_control)) {
1038                 if (is_multicast_ether_addr(hdr->addr1)) {
1039                         if (ieee80211_has_tods(hdr->frame_control) ||
1040                             !ieee80211_has_fromds(hdr->frame_control))
1041                                 return RX_DROP_MONITOR;
1042                         if (ether_addr_equal(hdr->addr3, dev_addr))
1043                                 return RX_DROP_MONITOR;
1044                 } else {
1045                         if (!ieee80211_has_a4(hdr->frame_control))
1046                                 return RX_DROP_MONITOR;
1047                         if (ether_addr_equal(hdr->addr4, dev_addr))
1048                                 return RX_DROP_MONITOR;
1049                 }
1050         }
1051
1052         /* If there is not an established peer link and this is not a peer link
1053          * establisment frame, beacon or probe, drop the frame.
1054          */
1055
1056         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1057                 struct ieee80211_mgmt *mgmt;
1058
1059                 if (!ieee80211_is_mgmt(hdr->frame_control))
1060                         return RX_DROP_MONITOR;
1061
1062                 if (ieee80211_is_action(hdr->frame_control)) {
1063                         u8 category;
1064
1065                         /* make sure category field is present */
1066                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1067                                 return RX_DROP_MONITOR;
1068
1069                         mgmt = (struct ieee80211_mgmt *)hdr;
1070                         category = mgmt->u.action.category;
1071                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1072                             category != WLAN_CATEGORY_SELF_PROTECTED)
1073                                 return RX_DROP_MONITOR;
1074                         return RX_CONTINUE;
1075                 }
1076
1077                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1078                     ieee80211_is_probe_resp(hdr->frame_control) ||
1079                     ieee80211_is_beacon(hdr->frame_control) ||
1080                     ieee80211_is_auth(hdr->frame_control))
1081                         return RX_CONTINUE;
1082
1083                 return RX_DROP_MONITOR;
1084         }
1085
1086         return RX_CONTINUE;
1087 }
1088
1089 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1090                                               int index)
1091 {
1092         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1093         struct sk_buff *tail = skb_peek_tail(frames);
1094         struct ieee80211_rx_status *status;
1095
1096         if (tid_agg_rx->reorder_buf_filtered &&
1097             tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1098                 return true;
1099
1100         if (!tail)
1101                 return false;
1102
1103         status = IEEE80211_SKB_RXCB(tail);
1104         if (status->flag & RX_FLAG_AMSDU_MORE)
1105                 return false;
1106
1107         return true;
1108 }
1109
1110 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1111                                             struct tid_ampdu_rx *tid_agg_rx,
1112                                             int index,
1113                                             struct sk_buff_head *frames)
1114 {
1115         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1116         struct sk_buff *skb;
1117         struct ieee80211_rx_status *status;
1118
1119         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1120
1121         if (skb_queue_empty(skb_list))
1122                 goto no_frame;
1123
1124         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1125                 __skb_queue_purge(skb_list);
1126                 goto no_frame;
1127         }
1128
1129         /* release frames from the reorder ring buffer */
1130         tid_agg_rx->stored_mpdu_num--;
1131         while ((skb = __skb_dequeue(skb_list))) {
1132                 status = IEEE80211_SKB_RXCB(skb);
1133                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1134                 __skb_queue_tail(frames, skb);
1135         }
1136
1137 no_frame:
1138         if (tid_agg_rx->reorder_buf_filtered)
1139                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1140         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1141 }
1142
1143 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1144                                              struct tid_ampdu_rx *tid_agg_rx,
1145                                              u16 head_seq_num,
1146                                              struct sk_buff_head *frames)
1147 {
1148         int index;
1149
1150         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1151
1152         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1153                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1154                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1155                                                 frames);
1156         }
1157 }
1158
1159 /*
1160  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1161  * the skb was added to the buffer longer than this time ago, the earlier
1162  * frames that have not yet been received are assumed to be lost and the skb
1163  * can be released for processing. This may also release other skb's from the
1164  * reorder buffer if there are no additional gaps between the frames.
1165  *
1166  * Callers must hold tid_agg_rx->reorder_lock.
1167  */
1168 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1169
1170 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1171                                           struct tid_ampdu_rx *tid_agg_rx,
1172                                           struct sk_buff_head *frames)
1173 {
1174         int index, i, j;
1175
1176         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1177
1178         /* release the buffer until next missing frame */
1179         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1180         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1181             tid_agg_rx->stored_mpdu_num) {
1182                 /*
1183                  * No buffers ready to be released, but check whether any
1184                  * frames in the reorder buffer have timed out.
1185                  */
1186                 int skipped = 1;
1187                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1188                      j = (j + 1) % tid_agg_rx->buf_size) {
1189                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1190                                 skipped++;
1191                                 continue;
1192                         }
1193                         if (skipped &&
1194                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1195                                         HT_RX_REORDER_BUF_TIMEOUT))
1196                                 goto set_release_timer;
1197
1198                         /* don't leave incomplete A-MSDUs around */
1199                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1200                              i = (i + 1) % tid_agg_rx->buf_size)
1201                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1202
1203                         ht_dbg_ratelimited(sdata,
1204                                            "release an RX reorder frame due to timeout on earlier frames\n");
1205                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1206                                                         frames);
1207
1208                         /*
1209                          * Increment the head seq# also for the skipped slots.
1210                          */
1211                         tid_agg_rx->head_seq_num =
1212                                 (tid_agg_rx->head_seq_num +
1213                                  skipped) & IEEE80211_SN_MASK;
1214                         skipped = 0;
1215                 }
1216         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1217                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1218                                                 frames);
1219                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1220         }
1221
1222         if (tid_agg_rx->stored_mpdu_num) {
1223                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1224
1225                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1226                      j = (j + 1) % tid_agg_rx->buf_size) {
1227                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1228                                 break;
1229                 }
1230
1231  set_release_timer:
1232
1233                 if (!tid_agg_rx->removed)
1234                         mod_timer(&tid_agg_rx->reorder_timer,
1235                                   tid_agg_rx->reorder_time[j] + 1 +
1236                                   HT_RX_REORDER_BUF_TIMEOUT);
1237         } else {
1238                 del_timer(&tid_agg_rx->reorder_timer);
1239         }
1240 }
1241
1242 /*
1243  * As this function belongs to the RX path it must be under
1244  * rcu_read_lock protection. It returns false if the frame
1245  * can be processed immediately, true if it was consumed.
1246  */
1247 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1248                                              struct tid_ampdu_rx *tid_agg_rx,
1249                                              struct sk_buff *skb,
1250                                              struct sk_buff_head *frames)
1251 {
1252         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1253         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1254         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1255         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1256         u16 head_seq_num, buf_size;
1257         int index;
1258         bool ret = true;
1259
1260         spin_lock(&tid_agg_rx->reorder_lock);
1261
1262         /*
1263          * Offloaded BA sessions have no known starting sequence number so pick
1264          * one from first Rxed frame for this tid after BA was started.
1265          */
1266         if (unlikely(tid_agg_rx->auto_seq)) {
1267                 tid_agg_rx->auto_seq = false;
1268                 tid_agg_rx->ssn = mpdu_seq_num;
1269                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1270         }
1271
1272         buf_size = tid_agg_rx->buf_size;
1273         head_seq_num = tid_agg_rx->head_seq_num;
1274
1275         /*
1276          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1277          * be reordered.
1278          */
1279         if (unlikely(!tid_agg_rx->started)) {
1280                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1281                         ret = false;
1282                         goto out;
1283                 }
1284                 tid_agg_rx->started = true;
1285         }
1286
1287         /* frame with out of date sequence number */
1288         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1289                 dev_kfree_skb(skb);
1290                 goto out;
1291         }
1292
1293         /*
1294          * If frame the sequence number exceeds our buffering window
1295          * size release some previous frames to make room for this one.
1296          */
1297         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1298                 head_seq_num = ieee80211_sn_inc(
1299                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1300                 /* release stored frames up to new head to stack */
1301                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1302                                                  head_seq_num, frames);
1303         }
1304
1305         /* Now the new frame is always in the range of the reordering buffer */
1306
1307         index = mpdu_seq_num % tid_agg_rx->buf_size;
1308
1309         /* check if we already stored this frame */
1310         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1311                 dev_kfree_skb(skb);
1312                 goto out;
1313         }
1314
1315         /*
1316          * If the current MPDU is in the right order and nothing else
1317          * is stored we can process it directly, no need to buffer it.
1318          * If it is first but there's something stored, we may be able
1319          * to release frames after this one.
1320          */
1321         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1322             tid_agg_rx->stored_mpdu_num == 0) {
1323                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1324                         tid_agg_rx->head_seq_num =
1325                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1326                 ret = false;
1327                 goto out;
1328         }
1329
1330         /* put the frame in the reordering buffer */
1331         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1332         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1333                 tid_agg_rx->reorder_time[index] = jiffies;
1334                 tid_agg_rx->stored_mpdu_num++;
1335                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1336         }
1337
1338  out:
1339         spin_unlock(&tid_agg_rx->reorder_lock);
1340         return ret;
1341 }
1342
1343 /*
1344  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1345  * true if the MPDU was buffered, false if it should be processed.
1346  */
1347 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1348                                        struct sk_buff_head *frames)
1349 {
1350         struct sk_buff *skb = rx->skb;
1351         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1352         struct sta_info *sta = rx->sta;
1353         struct tid_ampdu_rx *tid_agg_rx;
1354         u16 sc;
1355         u8 tid, ack_policy;
1356
1357         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1358             is_multicast_ether_addr(hdr->addr1))
1359                 goto dont_reorder;
1360
1361         /*
1362          * filter the QoS data rx stream according to
1363          * STA/TID and check if this STA/TID is on aggregation
1364          */
1365
1366         if (!sta)
1367                 goto dont_reorder;
1368
1369         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1370                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1371         tid = ieee80211_get_tid(hdr);
1372
1373         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1374         if (!tid_agg_rx) {
1375                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1376                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1377                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1378                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1379                                              WLAN_BACK_RECIPIENT,
1380                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1381                 goto dont_reorder;
1382         }
1383
1384         /* qos null data frames are excluded */
1385         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1386                 goto dont_reorder;
1387
1388         /* not part of a BA session */
1389         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1390                 goto dont_reorder;
1391
1392         /* new, potentially un-ordered, ampdu frame - process it */
1393
1394         /* reset session timer */
1395         if (tid_agg_rx->timeout)
1396                 tid_agg_rx->last_rx = jiffies;
1397
1398         /* if this mpdu is fragmented - terminate rx aggregation session */
1399         sc = le16_to_cpu(hdr->seq_ctrl);
1400         if (sc & IEEE80211_SCTL_FRAG) {
1401                 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1402                 return;
1403         }
1404
1405         /*
1406          * No locking needed -- we will only ever process one
1407          * RX packet at a time, and thus own tid_agg_rx. All
1408          * other code manipulating it needs to (and does) make
1409          * sure that we cannot get to it any more before doing
1410          * anything with it.
1411          */
1412         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1413                                              frames))
1414                 return;
1415
1416  dont_reorder:
1417         __skb_queue_tail(frames, skb);
1418 }
1419
1420 static ieee80211_rx_result debug_noinline
1421 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1422 {
1423         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1424         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1425
1426         if (status->flag & RX_FLAG_DUP_VALIDATED)
1427                 return RX_CONTINUE;
1428
1429         /*
1430          * Drop duplicate 802.11 retransmissions
1431          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1432          */
1433
1434         if (rx->skb->len < 24)
1435                 return RX_CONTINUE;
1436
1437         if (ieee80211_is_ctl(hdr->frame_control) ||
1438             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1439             is_multicast_ether_addr(hdr->addr1))
1440                 return RX_CONTINUE;
1441
1442         if (!rx->sta)
1443                 return RX_CONTINUE;
1444
1445         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1446                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1447                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1448                 rx->link_sta->rx_stats.num_duplicates++;
1449                 return RX_DROP_U_DUP;
1450         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1451                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1452         }
1453
1454         return RX_CONTINUE;
1455 }
1456
1457 static ieee80211_rx_result debug_noinline
1458 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1459 {
1460         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1461
1462         /* Drop disallowed frame classes based on STA auth/assoc state;
1463          * IEEE 802.11, Chap 5.5.
1464          *
1465          * mac80211 filters only based on association state, i.e. it drops
1466          * Class 3 frames from not associated stations. hostapd sends
1467          * deauth/disassoc frames when needed. In addition, hostapd is
1468          * responsible for filtering on both auth and assoc states.
1469          */
1470
1471         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1472                 return ieee80211_rx_mesh_check(rx);
1473
1474         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1475                       ieee80211_is_pspoll(hdr->frame_control)) &&
1476                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1477                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1478                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1479                 /*
1480                  * accept port control frames from the AP even when it's not
1481                  * yet marked ASSOC to prevent a race where we don't set the
1482                  * assoc bit quickly enough before it sends the first frame
1483                  */
1484                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1485                     ieee80211_is_data_present(hdr->frame_control)) {
1486                         unsigned int hdrlen;
1487                         __be16 ethertype;
1488
1489                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1490
1491                         if (rx->skb->len < hdrlen + 8)
1492                                 return RX_DROP_MONITOR;
1493
1494                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1495                         if (ethertype == rx->sdata->control_port_protocol)
1496                                 return RX_CONTINUE;
1497                 }
1498
1499                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1500                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1501                                                hdr->addr2,
1502                                                GFP_ATOMIC))
1503                         return RX_DROP_U_SPURIOUS;
1504
1505                 return RX_DROP_MONITOR;
1506         }
1507
1508         return RX_CONTINUE;
1509 }
1510
1511
1512 static ieee80211_rx_result debug_noinline
1513 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1514 {
1515         struct ieee80211_local *local;
1516         struct ieee80211_hdr *hdr;
1517         struct sk_buff *skb;
1518
1519         local = rx->local;
1520         skb = rx->skb;
1521         hdr = (struct ieee80211_hdr *) skb->data;
1522
1523         if (!local->pspolling)
1524                 return RX_CONTINUE;
1525
1526         if (!ieee80211_has_fromds(hdr->frame_control))
1527                 /* this is not from AP */
1528                 return RX_CONTINUE;
1529
1530         if (!ieee80211_is_data(hdr->frame_control))
1531                 return RX_CONTINUE;
1532
1533         if (!ieee80211_has_moredata(hdr->frame_control)) {
1534                 /* AP has no more frames buffered for us */
1535                 local->pspolling = false;
1536                 return RX_CONTINUE;
1537         }
1538
1539         /* more data bit is set, let's request a new frame from the AP */
1540         ieee80211_send_pspoll(local, rx->sdata);
1541
1542         return RX_CONTINUE;
1543 }
1544
1545 static void sta_ps_start(struct sta_info *sta)
1546 {
1547         struct ieee80211_sub_if_data *sdata = sta->sdata;
1548         struct ieee80211_local *local = sdata->local;
1549         struct ps_data *ps;
1550         int tid;
1551
1552         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1553             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1554                 ps = &sdata->bss->ps;
1555         else
1556                 return;
1557
1558         atomic_inc(&ps->num_sta_ps);
1559         set_sta_flag(sta, WLAN_STA_PS_STA);
1560         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1561                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1562         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1563                sta->sta.addr, sta->sta.aid);
1564
1565         ieee80211_clear_fast_xmit(sta);
1566
1567         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1568                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1569                 struct txq_info *txqi = to_txq_info(txq);
1570
1571                 spin_lock(&local->active_txq_lock[txq->ac]);
1572                 if (!list_empty(&txqi->schedule_order))
1573                         list_del_init(&txqi->schedule_order);
1574                 spin_unlock(&local->active_txq_lock[txq->ac]);
1575
1576                 if (txq_has_queue(txq))
1577                         set_bit(tid, &sta->txq_buffered_tids);
1578                 else
1579                         clear_bit(tid, &sta->txq_buffered_tids);
1580         }
1581 }
1582
1583 static void sta_ps_end(struct sta_info *sta)
1584 {
1585         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1586                sta->sta.addr, sta->sta.aid);
1587
1588         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1589                 /*
1590                  * Clear the flag only if the other one is still set
1591                  * so that the TX path won't start TX'ing new frames
1592                  * directly ... In the case that the driver flag isn't
1593                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1594                  */
1595                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1596                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1597                        sta->sta.addr, sta->sta.aid);
1598                 return;
1599         }
1600
1601         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1602         clear_sta_flag(sta, WLAN_STA_PS_STA);
1603         ieee80211_sta_ps_deliver_wakeup(sta);
1604 }
1605
1606 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1607 {
1608         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1609         bool in_ps;
1610
1611         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1612
1613         /* Don't let the same PS state be set twice */
1614         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1615         if ((start && in_ps) || (!start && !in_ps))
1616                 return -EINVAL;
1617
1618         if (start)
1619                 sta_ps_start(sta);
1620         else
1621                 sta_ps_end(sta);
1622
1623         return 0;
1624 }
1625 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1626
1627 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1628 {
1629         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1630
1631         if (test_sta_flag(sta, WLAN_STA_SP))
1632                 return;
1633
1634         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1635                 ieee80211_sta_ps_deliver_poll_response(sta);
1636         else
1637                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1638 }
1639 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1640
1641 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1642 {
1643         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1644         int ac = ieee80211_ac_from_tid(tid);
1645
1646         /*
1647          * If this AC is not trigger-enabled do nothing unless the
1648          * driver is calling us after it already checked.
1649          *
1650          * NB: This could/should check a separate bitmap of trigger-
1651          * enabled queues, but for now we only implement uAPSD w/o
1652          * TSPEC changes to the ACs, so they're always the same.
1653          */
1654         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1655             tid != IEEE80211_NUM_TIDS)
1656                 return;
1657
1658         /* if we are in a service period, do nothing */
1659         if (test_sta_flag(sta, WLAN_STA_SP))
1660                 return;
1661
1662         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1663                 ieee80211_sta_ps_deliver_uapsd(sta);
1664         else
1665                 set_sta_flag(sta, WLAN_STA_UAPSD);
1666 }
1667 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1668
1669 static ieee80211_rx_result debug_noinline
1670 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1671 {
1672         struct ieee80211_sub_if_data *sdata = rx->sdata;
1673         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1674         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1675
1676         if (!rx->sta)
1677                 return RX_CONTINUE;
1678
1679         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1680             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1681                 return RX_CONTINUE;
1682
1683         /*
1684          * The device handles station powersave, so don't do anything about
1685          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1686          * it to mac80211 since they're handled.)
1687          */
1688         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1689                 return RX_CONTINUE;
1690
1691         /*
1692          * Don't do anything if the station isn't already asleep. In
1693          * the uAPSD case, the station will probably be marked asleep,
1694          * in the PS-Poll case the station must be confused ...
1695          */
1696         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1697                 return RX_CONTINUE;
1698
1699         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1700                 ieee80211_sta_pspoll(&rx->sta->sta);
1701
1702                 /* Free PS Poll skb here instead of returning RX_DROP that would
1703                  * count as an dropped frame. */
1704                 dev_kfree_skb(rx->skb);
1705
1706                 return RX_QUEUED;
1707         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1708                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1709                    ieee80211_has_pm(hdr->frame_control) &&
1710                    (ieee80211_is_data_qos(hdr->frame_control) ||
1711                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1712                 u8 tid = ieee80211_get_tid(hdr);
1713
1714                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1715         }
1716
1717         return RX_CONTINUE;
1718 }
1719
1720 static ieee80211_rx_result debug_noinline
1721 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1722 {
1723         struct sta_info *sta = rx->sta;
1724         struct link_sta_info *link_sta = rx->link_sta;
1725         struct sk_buff *skb = rx->skb;
1726         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1727         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1728         int i;
1729
1730         if (!sta || !link_sta)
1731                 return RX_CONTINUE;
1732
1733         /*
1734          * Update last_rx only for IBSS packets which are for the current
1735          * BSSID and for station already AUTHORIZED to avoid keeping the
1736          * current IBSS network alive in cases where other STAs start
1737          * using different BSSID. This will also give the station another
1738          * chance to restart the authentication/authorization in case
1739          * something went wrong the first time.
1740          */
1741         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1742                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1743                                                 NL80211_IFTYPE_ADHOC);
1744                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1745                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1746                         link_sta->rx_stats.last_rx = jiffies;
1747                         if (ieee80211_is_data_present(hdr->frame_control) &&
1748                             !is_multicast_ether_addr(hdr->addr1))
1749                                 link_sta->rx_stats.last_rate =
1750                                         sta_stats_encode_rate(status);
1751                 }
1752         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1753                 link_sta->rx_stats.last_rx = jiffies;
1754         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1755                    !is_multicast_ether_addr(hdr->addr1)) {
1756                 /*
1757                  * Mesh beacons will update last_rx when if they are found to
1758                  * match the current local configuration when processed.
1759                  */
1760                 link_sta->rx_stats.last_rx = jiffies;
1761                 if (ieee80211_is_data_present(hdr->frame_control))
1762                         link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1763         }
1764
1765         link_sta->rx_stats.fragments++;
1766
1767         u64_stats_update_begin(&link_sta->rx_stats.syncp);
1768         link_sta->rx_stats.bytes += rx->skb->len;
1769         u64_stats_update_end(&link_sta->rx_stats.syncp);
1770
1771         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1772                 link_sta->rx_stats.last_signal = status->signal;
1773                 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1774                                 -status->signal);
1775         }
1776
1777         if (status->chains) {
1778                 link_sta->rx_stats.chains = status->chains;
1779                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1780                         int signal = status->chain_signal[i];
1781
1782                         if (!(status->chains & BIT(i)))
1783                                 continue;
1784
1785                         link_sta->rx_stats.chain_signal_last[i] = signal;
1786                         ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1787                                         -signal);
1788                 }
1789         }
1790
1791         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1792                 return RX_CONTINUE;
1793
1794         /*
1795          * Change STA power saving mode only at the end of a frame
1796          * exchange sequence, and only for a data or management
1797          * frame as specified in IEEE 802.11-2016 11.2.3.2
1798          */
1799         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1800             !ieee80211_has_morefrags(hdr->frame_control) &&
1801             !is_multicast_ether_addr(hdr->addr1) &&
1802             (ieee80211_is_mgmt(hdr->frame_control) ||
1803              ieee80211_is_data(hdr->frame_control)) &&
1804             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1805             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1806              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1807                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1808                         if (!ieee80211_has_pm(hdr->frame_control))
1809                                 sta_ps_end(sta);
1810                 } else {
1811                         if (ieee80211_has_pm(hdr->frame_control))
1812                                 sta_ps_start(sta);
1813                 }
1814         }
1815
1816         /* mesh power save support */
1817         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1818                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1819
1820         /*
1821          * Drop (qos-)data::nullfunc frames silently, since they
1822          * are used only to control station power saving mode.
1823          */
1824         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1825                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1826
1827                 /*
1828                  * If we receive a 4-addr nullfunc frame from a STA
1829                  * that was not moved to a 4-addr STA vlan yet send
1830                  * the event to userspace and for older hostapd drop
1831                  * the frame to the monitor interface.
1832                  */
1833                 if (ieee80211_has_a4(hdr->frame_control) &&
1834                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1835                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1836                       !rx->sdata->u.vlan.sta))) {
1837                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1838                                 cfg80211_rx_unexpected_4addr_frame(
1839                                         rx->sdata->dev, sta->sta.addr,
1840                                         GFP_ATOMIC);
1841                         return RX_DROP_M_UNEXPECTED_4ADDR_FRAME;
1842                 }
1843                 /*
1844                  * Update counter and free packet here to avoid
1845                  * counting this as a dropped packed.
1846                  */
1847                 link_sta->rx_stats.packets++;
1848                 dev_kfree_skb(rx->skb);
1849                 return RX_QUEUED;
1850         }
1851
1852         return RX_CONTINUE;
1853 } /* ieee80211_rx_h_sta_process */
1854
1855 static struct ieee80211_key *
1856 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1857 {
1858         struct ieee80211_key *key = NULL;
1859         int idx2;
1860
1861         /* Make sure key gets set if either BIGTK key index is set so that
1862          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1863          * Beacon frames and Beacon frames that claim to use another BIGTK key
1864          * index (i.e., a key that we do not have).
1865          */
1866
1867         if (idx < 0) {
1868                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1869                 idx2 = idx + 1;
1870         } else {
1871                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1872                         idx2 = idx + 1;
1873                 else
1874                         idx2 = idx - 1;
1875         }
1876
1877         if (rx->link_sta)
1878                 key = rcu_dereference(rx->link_sta->gtk[idx]);
1879         if (!key)
1880                 key = rcu_dereference(rx->link->gtk[idx]);
1881         if (!key && rx->link_sta)
1882                 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1883         if (!key)
1884                 key = rcu_dereference(rx->link->gtk[idx2]);
1885
1886         return key;
1887 }
1888
1889 static ieee80211_rx_result debug_noinline
1890 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1891 {
1892         struct sk_buff *skb = rx->skb;
1893         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1894         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1895         int keyidx;
1896         ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL;
1897         struct ieee80211_key *sta_ptk = NULL;
1898         struct ieee80211_key *ptk_idx = NULL;
1899         int mmie_keyidx = -1;
1900         __le16 fc;
1901
1902         if (ieee80211_is_ext(hdr->frame_control))
1903                 return RX_CONTINUE;
1904
1905         /*
1906          * Key selection 101
1907          *
1908          * There are five types of keys:
1909          *  - GTK (group keys)
1910          *  - IGTK (group keys for management frames)
1911          *  - BIGTK (group keys for Beacon frames)
1912          *  - PTK (pairwise keys)
1913          *  - STK (station-to-station pairwise keys)
1914          *
1915          * When selecting a key, we have to distinguish between multicast
1916          * (including broadcast) and unicast frames, the latter can only
1917          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1918          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1919          * then unicast frames can also use key indices like GTKs. Hence, if we
1920          * don't have a PTK/STK we check the key index for a WEP key.
1921          *
1922          * Note that in a regular BSS, multicast frames are sent by the
1923          * AP only, associated stations unicast the frame to the AP first
1924          * which then multicasts it on their behalf.
1925          *
1926          * There is also a slight problem in IBSS mode: GTKs are negotiated
1927          * with each station, that is something we don't currently handle.
1928          * The spec seems to expect that one negotiates the same key with
1929          * every station but there's no such requirement; VLANs could be
1930          * possible.
1931          */
1932
1933         /* start without a key */
1934         rx->key = NULL;
1935         fc = hdr->frame_control;
1936
1937         if (rx->sta) {
1938                 int keyid = rx->sta->ptk_idx;
1939                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1940
1941                 if (ieee80211_has_protected(fc) &&
1942                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1943                         keyid = ieee80211_get_keyid(rx->skb);
1944
1945                         if (unlikely(keyid < 0))
1946                                 return RX_DROP_U_NO_KEY_ID;
1947
1948                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1949                 }
1950         }
1951
1952         if (!ieee80211_has_protected(fc))
1953                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1954
1955         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1956                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1957                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1958                     (status->flag & RX_FLAG_IV_STRIPPED))
1959                         return RX_CONTINUE;
1960                 /* Skip decryption if the frame is not protected. */
1961                 if (!ieee80211_has_protected(fc))
1962                         return RX_CONTINUE;
1963         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1964                 /* Broadcast/multicast robust management frame / BIP */
1965                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1966                     (status->flag & RX_FLAG_IV_STRIPPED))
1967                         return RX_CONTINUE;
1968
1969                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1970                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1971                                    NUM_DEFAULT_BEACON_KEYS) {
1972                         if (rx->sdata->dev)
1973                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1974                                                              skb->data,
1975                                                              skb->len);
1976                         return RX_DROP_M_BAD_BCN_KEYIDX;
1977                 }
1978
1979                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1980                 if (!rx->key)
1981                         return RX_CONTINUE; /* Beacon protection not in use */
1982         } else if (mmie_keyidx >= 0) {
1983                 /* Broadcast/multicast robust management frame / BIP */
1984                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1985                     (status->flag & RX_FLAG_IV_STRIPPED))
1986                         return RX_CONTINUE;
1987
1988                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1989                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1990                         return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
1991                 if (rx->link_sta) {
1992                         if (ieee80211_is_group_privacy_action(skb) &&
1993                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1994                                 return RX_DROP_MONITOR;
1995
1996                         rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
1997                 }
1998                 if (!rx->key)
1999                         rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
2000         } else if (!ieee80211_has_protected(fc)) {
2001                 /*
2002                  * The frame was not protected, so skip decryption. However, we
2003                  * need to set rx->key if there is a key that could have been
2004                  * used so that the frame may be dropped if encryption would
2005                  * have been expected.
2006                  */
2007                 struct ieee80211_key *key = NULL;
2008                 int i;
2009
2010                 if (ieee80211_is_beacon(fc)) {
2011                         key = ieee80211_rx_get_bigtk(rx, -1);
2012                 } else if (ieee80211_is_mgmt(fc) &&
2013                            is_multicast_ether_addr(hdr->addr1)) {
2014                         key = rcu_dereference(rx->link->default_mgmt_key);
2015                 } else {
2016                         if (rx->link_sta) {
2017                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2018                                         key = rcu_dereference(rx->link_sta->gtk[i]);
2019                                         if (key)
2020                                                 break;
2021                                 }
2022                         }
2023                         if (!key) {
2024                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2025                                         key = rcu_dereference(rx->link->gtk[i]);
2026                                         if (key)
2027                                                 break;
2028                                 }
2029                         }
2030                 }
2031                 if (key)
2032                         rx->key = key;
2033                 return RX_CONTINUE;
2034         } else {
2035                 /*
2036                  * The device doesn't give us the IV so we won't be
2037                  * able to look up the key. That's ok though, we
2038                  * don't need to decrypt the frame, we just won't
2039                  * be able to keep statistics accurate.
2040                  * Except for key threshold notifications, should
2041                  * we somehow allow the driver to tell us which key
2042                  * the hardware used if this flag is set?
2043                  */
2044                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2045                     (status->flag & RX_FLAG_IV_STRIPPED))
2046                         return RX_CONTINUE;
2047
2048                 keyidx = ieee80211_get_keyid(rx->skb);
2049
2050                 if (unlikely(keyidx < 0))
2051                         return RX_DROP_U_NO_KEY_ID;
2052
2053                 /* check per-station GTK first, if multicast packet */
2054                 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2055                         rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2056
2057                 /* if not found, try default key */
2058                 if (!rx->key) {
2059                         if (is_multicast_ether_addr(hdr->addr1))
2060                                 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2061                         if (!rx->key)
2062                                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2063
2064                         /*
2065                          * RSNA-protected unicast frames should always be
2066                          * sent with pairwise or station-to-station keys,
2067                          * but for WEP we allow using a key index as well.
2068                          */
2069                         if (rx->key &&
2070                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2071                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2072                             !is_multicast_ether_addr(hdr->addr1))
2073                                 rx->key = NULL;
2074                 }
2075         }
2076
2077         if (rx->key) {
2078                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2079                         return RX_DROP_MONITOR;
2080
2081                 /* TODO: add threshold stuff again */
2082         } else {
2083                 return RX_DROP_MONITOR;
2084         }
2085
2086         switch (rx->key->conf.cipher) {
2087         case WLAN_CIPHER_SUITE_WEP40:
2088         case WLAN_CIPHER_SUITE_WEP104:
2089                 result = ieee80211_crypto_wep_decrypt(rx);
2090                 break;
2091         case WLAN_CIPHER_SUITE_TKIP:
2092                 result = ieee80211_crypto_tkip_decrypt(rx);
2093                 break;
2094         case WLAN_CIPHER_SUITE_CCMP:
2095                 result = ieee80211_crypto_ccmp_decrypt(
2096                         rx, IEEE80211_CCMP_MIC_LEN);
2097                 break;
2098         case WLAN_CIPHER_SUITE_CCMP_256:
2099                 result = ieee80211_crypto_ccmp_decrypt(
2100                         rx, IEEE80211_CCMP_256_MIC_LEN);
2101                 break;
2102         case WLAN_CIPHER_SUITE_AES_CMAC:
2103                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2104                 break;
2105         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2106                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2107                 break;
2108         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2109         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2110                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2111                 break;
2112         case WLAN_CIPHER_SUITE_GCMP:
2113         case WLAN_CIPHER_SUITE_GCMP_256:
2114                 result = ieee80211_crypto_gcmp_decrypt(rx);
2115                 break;
2116         default:
2117                 result = RX_DROP_U_BAD_CIPHER;
2118         }
2119
2120         /* the hdr variable is invalid after the decrypt handlers */
2121
2122         /* either the frame has been decrypted or will be dropped */
2123         status->flag |= RX_FLAG_DECRYPTED;
2124
2125         if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
2126                      rx->sdata->dev))
2127                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2128                                              skb->data, skb->len);
2129
2130         return result;
2131 }
2132
2133 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2134 {
2135         int i;
2136
2137         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2138                 skb_queue_head_init(&cache->entries[i].skb_list);
2139 }
2140
2141 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2142 {
2143         int i;
2144
2145         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2146                 __skb_queue_purge(&cache->entries[i].skb_list);
2147 }
2148
2149 static inline struct ieee80211_fragment_entry *
2150 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2151                          unsigned int frag, unsigned int seq, int rx_queue,
2152                          struct sk_buff **skb)
2153 {
2154         struct ieee80211_fragment_entry *entry;
2155
2156         entry = &cache->entries[cache->next++];
2157         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2158                 cache->next = 0;
2159
2160         __skb_queue_purge(&entry->skb_list);
2161
2162         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2163         *skb = NULL;
2164         entry->first_frag_time = jiffies;
2165         entry->seq = seq;
2166         entry->rx_queue = rx_queue;
2167         entry->last_frag = frag;
2168         entry->check_sequential_pn = false;
2169         entry->extra_len = 0;
2170
2171         return entry;
2172 }
2173
2174 static inline struct ieee80211_fragment_entry *
2175 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2176                           unsigned int frag, unsigned int seq,
2177                           int rx_queue, struct ieee80211_hdr *hdr)
2178 {
2179         struct ieee80211_fragment_entry *entry;
2180         int i, idx;
2181
2182         idx = cache->next;
2183         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2184                 struct ieee80211_hdr *f_hdr;
2185                 struct sk_buff *f_skb;
2186
2187                 idx--;
2188                 if (idx < 0)
2189                         idx = IEEE80211_FRAGMENT_MAX - 1;
2190
2191                 entry = &cache->entries[idx];
2192                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2193                     entry->rx_queue != rx_queue ||
2194                     entry->last_frag + 1 != frag)
2195                         continue;
2196
2197                 f_skb = __skb_peek(&entry->skb_list);
2198                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2199
2200                 /*
2201                  * Check ftype and addresses are equal, else check next fragment
2202                  */
2203                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2204                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2205                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2206                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2207                         continue;
2208
2209                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2210                         __skb_queue_purge(&entry->skb_list);
2211                         continue;
2212                 }
2213                 return entry;
2214         }
2215
2216         return NULL;
2217 }
2218
2219 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2220 {
2221         return rx->key &&
2222                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2223                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2224                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2225                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2226                 ieee80211_has_protected(fc);
2227 }
2228
2229 static ieee80211_rx_result debug_noinline
2230 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2231 {
2232         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2233         struct ieee80211_hdr *hdr;
2234         u16 sc;
2235         __le16 fc;
2236         unsigned int frag, seq;
2237         struct ieee80211_fragment_entry *entry;
2238         struct sk_buff *skb;
2239         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2240
2241         hdr = (struct ieee80211_hdr *)rx->skb->data;
2242         fc = hdr->frame_control;
2243
2244         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2245                 return RX_CONTINUE;
2246
2247         sc = le16_to_cpu(hdr->seq_ctrl);
2248         frag = sc & IEEE80211_SCTL_FRAG;
2249
2250         if (rx->sta)
2251                 cache = &rx->sta->frags;
2252
2253         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2254                 goto out;
2255
2256         if (is_multicast_ether_addr(hdr->addr1))
2257                 return RX_DROP_MONITOR;
2258
2259         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2260
2261         if (skb_linearize(rx->skb))
2262                 return RX_DROP_U_OOM;
2263
2264         /*
2265          *  skb_linearize() might change the skb->data and
2266          *  previously cached variables (in this case, hdr) need to
2267          *  be refreshed with the new data.
2268          */
2269         hdr = (struct ieee80211_hdr *)rx->skb->data;
2270         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2271
2272         if (frag == 0) {
2273                 /* This is the first fragment of a new frame. */
2274                 entry = ieee80211_reassemble_add(cache, frag, seq,
2275                                                  rx->seqno_idx, &(rx->skb));
2276                 if (requires_sequential_pn(rx, fc)) {
2277                         int queue = rx->security_idx;
2278
2279                         /* Store CCMP/GCMP PN so that we can verify that the
2280                          * next fragment has a sequential PN value.
2281                          */
2282                         entry->check_sequential_pn = true;
2283                         entry->is_protected = true;
2284                         entry->key_color = rx->key->color;
2285                         memcpy(entry->last_pn,
2286                                rx->key->u.ccmp.rx_pn[queue],
2287                                IEEE80211_CCMP_PN_LEN);
2288                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2289                                               u.ccmp.rx_pn) !=
2290                                      offsetof(struct ieee80211_key,
2291                                               u.gcmp.rx_pn));
2292                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2293                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2294                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2295                                      IEEE80211_GCMP_PN_LEN);
2296                 } else if (rx->key &&
2297                            (ieee80211_has_protected(fc) ||
2298                             (status->flag & RX_FLAG_DECRYPTED))) {
2299                         entry->is_protected = true;
2300                         entry->key_color = rx->key->color;
2301                 }
2302                 return RX_QUEUED;
2303         }
2304
2305         /* This is a fragment for a frame that should already be pending in
2306          * fragment cache. Add this fragment to the end of the pending entry.
2307          */
2308         entry = ieee80211_reassemble_find(cache, frag, seq,
2309                                           rx->seqno_idx, hdr);
2310         if (!entry) {
2311                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2312                 return RX_DROP_MONITOR;
2313         }
2314
2315         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2316          *  MPDU PN values are not incrementing in steps of 1."
2317          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2318          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2319          */
2320         if (entry->check_sequential_pn) {
2321                 int i;
2322                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2323
2324                 if (!requires_sequential_pn(rx, fc))
2325                         return RX_DROP_U_NONSEQ_PN;
2326
2327                 /* Prevent mixed key and fragment cache attacks */
2328                 if (entry->key_color != rx->key->color)
2329                         return RX_DROP_U_BAD_KEY_COLOR;
2330
2331                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2332                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2333                         pn[i]++;
2334                         if (pn[i])
2335                                 break;
2336                 }
2337
2338                 rpn = rx->ccm_gcm.pn;
2339                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2340                         return RX_DROP_U_REPLAY;
2341                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2342         } else if (entry->is_protected &&
2343                    (!rx->key ||
2344                     (!ieee80211_has_protected(fc) &&
2345                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2346                     rx->key->color != entry->key_color)) {
2347                 /* Drop this as a mixed key or fragment cache attack, even
2348                  * if for TKIP Michael MIC should protect us, and WEP is a
2349                  * lost cause anyway.
2350                  */
2351                 return RX_DROP_U_EXPECT_DEFRAG_PROT;
2352         } else if (entry->is_protected && rx->key &&
2353                    entry->key_color != rx->key->color &&
2354                    (status->flag & RX_FLAG_DECRYPTED)) {
2355                 return RX_DROP_U_BAD_KEY_COLOR;
2356         }
2357
2358         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2359         __skb_queue_tail(&entry->skb_list, rx->skb);
2360         entry->last_frag = frag;
2361         entry->extra_len += rx->skb->len;
2362         if (ieee80211_has_morefrags(fc)) {
2363                 rx->skb = NULL;
2364                 return RX_QUEUED;
2365         }
2366
2367         rx->skb = __skb_dequeue(&entry->skb_list);
2368         if (skb_tailroom(rx->skb) < entry->extra_len) {
2369                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2370                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2371                                               GFP_ATOMIC))) {
2372                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2373                         __skb_queue_purge(&entry->skb_list);
2374                         return RX_DROP_U_OOM;
2375                 }
2376         }
2377         while ((skb = __skb_dequeue(&entry->skb_list))) {
2378                 skb_put_data(rx->skb, skb->data, skb->len);
2379                 dev_kfree_skb(skb);
2380         }
2381
2382  out:
2383         ieee80211_led_rx(rx->local);
2384         if (rx->sta)
2385                 rx->link_sta->rx_stats.packets++;
2386         return RX_CONTINUE;
2387 }
2388
2389 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2390 {
2391         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2392                 return -EACCES;
2393
2394         return 0;
2395 }
2396
2397 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2398 {
2399         struct sk_buff *skb = rx->skb;
2400         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2401
2402         /*
2403          * Pass through unencrypted frames if the hardware has
2404          * decrypted them already.
2405          */
2406         if (status->flag & RX_FLAG_DECRYPTED)
2407                 return 0;
2408
2409         /* Drop unencrypted frames if key is set. */
2410         if (unlikely(!ieee80211_has_protected(fc) &&
2411                      !ieee80211_is_any_nullfunc(fc) &&
2412                      ieee80211_is_data(fc) && rx->key))
2413                 return -EACCES;
2414
2415         return 0;
2416 }
2417
2418 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result
2419 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2420 {
2421         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2422         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2423         __le16 fc = mgmt->frame_control;
2424
2425         /*
2426          * Pass through unencrypted frames if the hardware has
2427          * decrypted them already.
2428          */
2429         if (status->flag & RX_FLAG_DECRYPTED)
2430                 return RX_CONTINUE;
2431
2432         /* drop unicast protected dual (that wasn't protected) */
2433         if (ieee80211_is_action(fc) &&
2434             mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
2435                 return RX_DROP_U_UNPROT_DUAL;
2436
2437         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2438                 if (unlikely(!ieee80211_has_protected(fc) &&
2439                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) {
2440                         if (ieee80211_is_deauth(fc) ||
2441                             ieee80211_is_disassoc(fc)) {
2442                                 /*
2443                                  * Permit unprotected deauth/disassoc frames
2444                                  * during 4-way-HS (key is installed after HS).
2445                                  */
2446                                 if (!rx->key)
2447                                         return RX_CONTINUE;
2448
2449                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2450                                                              rx->skb->data,
2451                                                              rx->skb->len);
2452                         }
2453                         return RX_DROP_U_UNPROT_UCAST_MGMT;
2454                 }
2455                 /* BIP does not use Protected field, so need to check MMIE */
2456                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2457                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2458                         if (ieee80211_is_deauth(fc) ||
2459                             ieee80211_is_disassoc(fc))
2460                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2461                                                              rx->skb->data,
2462                                                              rx->skb->len);
2463                         return RX_DROP_U_UNPROT_MCAST_MGMT;
2464                 }
2465                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2466                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2467                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2468                                                      rx->skb->data,
2469                                                      rx->skb->len);
2470                         return RX_DROP_U_UNPROT_BEACON;
2471                 }
2472                 /*
2473                  * When using MFP, Action frames are not allowed prior to
2474                  * having configured keys.
2475                  */
2476                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2477                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2478                         return RX_DROP_U_UNPROT_ACTION;
2479
2480                 /* drop unicast public action frames when using MPF */
2481                 if (is_unicast_ether_addr(mgmt->da) &&
2482                     ieee80211_is_protected_dual_of_public_action(rx->skb))
2483                         return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION;
2484         }
2485
2486         /*
2487          * Drop robust action frames before assoc regardless of MFP state,
2488          * after assoc we also have decided on MFP or not.
2489          */
2490         if (ieee80211_is_action(fc) &&
2491             ieee80211_is_robust_mgmt_frame(rx->skb) &&
2492             (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))
2493                 return RX_DROP_U_UNPROT_ROBUST_ACTION;
2494
2495         return RX_CONTINUE;
2496 }
2497 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt);
2498
2499 static ieee80211_rx_result
2500 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2501 {
2502         struct ieee80211_sub_if_data *sdata = rx->sdata;
2503         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2504         bool check_port_control = false;
2505         struct ethhdr *ehdr;
2506         int ret;
2507
2508         *port_control = false;
2509         if (ieee80211_has_a4(hdr->frame_control) &&
2510             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2511                 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR;
2512
2513         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2514             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2515                 if (!sdata->u.mgd.use_4addr)
2516                         return RX_DROP_U_UNEXPECTED_STA_4ADDR;
2517                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2518                         check_port_control = true;
2519         }
2520
2521         if (is_multicast_ether_addr(hdr->addr1) &&
2522             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2523                 return RX_DROP_U_UNEXPECTED_VLAN_MCAST;
2524
2525         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2526         if (ret < 0)
2527                 return RX_DROP_U_INVALID_8023;
2528
2529         ehdr = (struct ethhdr *) rx->skb->data;
2530         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2531                 *port_control = true;
2532         else if (check_port_control)
2533                 return RX_DROP_U_NOT_PORT_CONTROL;
2534
2535         return RX_CONTINUE;
2536 }
2537
2538 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2539                            const u8 *addr, int *out_link_id)
2540 {
2541         unsigned int link_id;
2542
2543         /* non-MLO, or MLD address replaced by hardware */
2544         if (ether_addr_equal(sdata->vif.addr, addr))
2545                 return true;
2546
2547         if (!ieee80211_vif_is_mld(&sdata->vif))
2548                 return false;
2549
2550         for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2551                 struct ieee80211_bss_conf *conf;
2552
2553                 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2554
2555                 if (!conf)
2556                         continue;
2557                 if (ether_addr_equal(conf->addr, addr)) {
2558                         if (out_link_id)
2559                                 *out_link_id = link_id;
2560                         return true;
2561                 }
2562         }
2563
2564         return false;
2565 }
2566
2567 /*
2568  * requires that rx->skb is a frame with ethernet header
2569  */
2570 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2571 {
2572         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2573                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2574         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2575
2576         /*
2577          * Allow EAPOL frames to us/the PAE group address regardless of
2578          * whether the frame was encrypted or not, and always disallow
2579          * all other destination addresses for them.
2580          */
2581         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2582                 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
2583                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2584
2585         if (ieee80211_802_1x_port_control(rx) ||
2586             ieee80211_drop_unencrypted(rx, fc))
2587                 return false;
2588
2589         return true;
2590 }
2591
2592 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2593                                                  struct ieee80211_rx_data *rx)
2594 {
2595         struct ieee80211_sub_if_data *sdata = rx->sdata;
2596         struct net_device *dev = sdata->dev;
2597
2598         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2599                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2600                       !sdata->control_port_no_preauth)) &&
2601                      sdata->control_port_over_nl80211)) {
2602                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2603                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2604
2605                 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id);
2606                 dev_kfree_skb(skb);
2607         } else {
2608                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2609
2610                 memset(skb->cb, 0, sizeof(skb->cb));
2611
2612                 /*
2613                  * 802.1X over 802.11 requires that the authenticator address
2614                  * be used for EAPOL frames. However, 802.1X allows the use of
2615                  * the PAE group address instead. If the interface is part of
2616                  * a bridge and we pass the frame with the PAE group address,
2617                  * then the bridge will forward it to the network (even if the
2618                  * client was not associated yet), which isn't supposed to
2619                  * happen.
2620                  * To avoid that, rewrite the destination address to our own
2621                  * address, so that the authenticator (e.g. hostapd) will see
2622                  * the frame, but bridge won't forward it anywhere else. Note
2623                  * that due to earlier filtering, the only other address can
2624                  * be the PAE group address, unless the hardware allowed them
2625                  * through in 802.3 offloaded mode.
2626                  */
2627                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2628                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2629                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2630
2631                 /* deliver to local stack */
2632                 if (rx->list)
2633                         list_add_tail(&skb->list, rx->list);
2634                 else
2635                         netif_receive_skb(skb);
2636         }
2637 }
2638
2639 /*
2640  * requires that rx->skb is a frame with ethernet header
2641  */
2642 static void
2643 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2644 {
2645         struct ieee80211_sub_if_data *sdata = rx->sdata;
2646         struct net_device *dev = sdata->dev;
2647         struct sk_buff *skb, *xmit_skb;
2648         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2649         struct sta_info *dsta;
2650
2651         skb = rx->skb;
2652         xmit_skb = NULL;
2653
2654         dev_sw_netstats_rx_add(dev, skb->len);
2655
2656         if (rx->sta) {
2657                 /* The seqno index has the same property as needed
2658                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2659                  * for non-QoS-data frames. Here we know it's a data
2660                  * frame, so count MSDUs.
2661                  */
2662                 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
2663                 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2664                 u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
2665         }
2666
2667         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2668              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2669             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2670             ehdr->h_proto != rx->sdata->control_port_protocol &&
2671             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2672                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2673                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2674                         /*
2675                          * send multicast frames both to higher layers in
2676                          * local net stack and back to the wireless medium
2677                          */
2678                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2679                         if (!xmit_skb)
2680                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2681                                                     dev->name);
2682                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2683                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2684                         dsta = sta_info_get(sdata, ehdr->h_dest);
2685                         if (dsta) {
2686                                 /*
2687                                  * The destination station is associated to
2688                                  * this AP (in this VLAN), so send the frame
2689                                  * directly to it and do not pass it to local
2690                                  * net stack.
2691                                  */
2692                                 xmit_skb = skb;
2693                                 skb = NULL;
2694                         }
2695                 }
2696         }
2697
2698 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2699         if (skb) {
2700                 /* 'align' will only take the values 0 or 2 here since all
2701                  * frames are required to be aligned to 2-byte boundaries
2702                  * when being passed to mac80211; the code here works just
2703                  * as well if that isn't true, but mac80211 assumes it can
2704                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2705                  */
2706                 int align;
2707
2708                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2709                 if (align) {
2710                         if (WARN_ON(skb_headroom(skb) < 3)) {
2711                                 dev_kfree_skb(skb);
2712                                 skb = NULL;
2713                         } else {
2714                                 u8 *data = skb->data;
2715                                 size_t len = skb_headlen(skb);
2716                                 skb->data -= align;
2717                                 memmove(skb->data, data, len);
2718                                 skb_set_tail_pointer(skb, len);
2719                         }
2720                 }
2721         }
2722 #endif
2723
2724         if (skb) {
2725                 skb->protocol = eth_type_trans(skb, dev);
2726                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2727         }
2728
2729         if (xmit_skb) {
2730                 /*
2731                  * Send to wireless media and increase priority by 256 to
2732                  * keep the received priority instead of reclassifying
2733                  * the frame (see cfg80211_classify8021d).
2734                  */
2735                 xmit_skb->priority += 256;
2736                 xmit_skb->protocol = htons(ETH_P_802_3);
2737                 skb_reset_network_header(xmit_skb);
2738                 skb_reset_mac_header(xmit_skb);
2739                 dev_queue_xmit(xmit_skb);
2740         }
2741 }
2742
2743 #ifdef CONFIG_MAC80211_MESH
2744 static bool
2745 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
2746                                struct sk_buff *skb, int hdrlen)
2747 {
2748         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2749         struct ieee80211_mesh_fast_tx *entry = NULL;
2750         struct ieee80211s_hdr *mesh_hdr;
2751         struct tid_ampdu_tx *tid_tx;
2752         struct sta_info *sta;
2753         struct ethhdr eth;
2754         u8 tid;
2755
2756         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
2757         if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2758                 entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
2759         else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
2760                 entry = mesh_fast_tx_get(sdata, skb->data);
2761         if (!entry)
2762                 return false;
2763
2764         sta = rcu_dereference(entry->mpath->next_hop);
2765         if (!sta)
2766                 return false;
2767
2768         if (skb_linearize(skb))
2769                 return false;
2770
2771         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2772         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2773         if (tid_tx) {
2774                 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2775                         return false;
2776
2777                 if (tid_tx->timeout)
2778                         tid_tx->last_tx = jiffies;
2779         }
2780
2781         ieee80211_aggr_check(sdata, sta, skb);
2782
2783         if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
2784                                             &skb->protocol))
2785                 hdrlen += ETH_ALEN;
2786         else
2787                 skb->protocol = htons(skb->len - hdrlen);
2788         skb_set_network_header(skb, hdrlen + 2);
2789
2790         skb->dev = sdata->dev;
2791         memcpy(&eth, skb->data, ETH_HLEN - 2);
2792         skb_pull(skb, 2);
2793         __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
2794                               eth.h_dest, eth.h_source);
2795         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2796         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2797
2798         return true;
2799 }
2800 #endif
2801
2802 static ieee80211_rx_result
2803 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
2804                        struct sk_buff *skb)
2805 {
2806 #ifdef CONFIG_MAC80211_MESH
2807         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2808         struct ieee80211_local *local = sdata->local;
2809         uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
2810         struct ieee80211_hdr hdr = {
2811                 .frame_control = cpu_to_le16(fc)
2812         };
2813         struct ieee80211_hdr *fwd_hdr;
2814         struct ieee80211s_hdr *mesh_hdr;
2815         struct ieee80211_tx_info *info;
2816         struct sk_buff *fwd_skb;
2817         struct ethhdr *eth;
2818         bool multicast;
2819         int tailroom = 0;
2820         int hdrlen, mesh_hdrlen;
2821         u8 *qos;
2822
2823         if (!ieee80211_vif_is_mesh(&sdata->vif))
2824                 return RX_CONTINUE;
2825
2826         if (!pskb_may_pull(skb, sizeof(*eth) + 6))
2827                 return RX_DROP_MONITOR;
2828
2829         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
2830         mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);
2831
2832         if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
2833                 return RX_DROP_MONITOR;
2834
2835         eth = (struct ethhdr *)skb->data;
2836         multicast = is_multicast_ether_addr(eth->h_dest);
2837
2838         mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
2839         if (!mesh_hdr->ttl)
2840                 return RX_DROP_MONITOR;
2841
2842         /* frame is in RMC, don't forward */
2843         if (is_multicast_ether_addr(eth->h_dest) &&
2844             mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
2845                 return RX_DROP_MONITOR;
2846
2847         /* forward packet */
2848         if (sdata->crypto_tx_tailroom_needed_cnt)
2849                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2850
2851         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2852                 struct mesh_path *mppath;
2853                 char *proxied_addr;
2854                 bool update = false;
2855
2856                 if (multicast)
2857                         proxied_addr = mesh_hdr->eaddr1;
2858                 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2859                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2860                         proxied_addr = mesh_hdr->eaddr2;
2861                 else
2862                         return RX_DROP_MONITOR;
2863
2864                 rcu_read_lock();
2865                 mppath = mpp_path_lookup(sdata, proxied_addr);
2866                 if (!mppath) {
2867                         mpp_path_add(sdata, proxied_addr, eth->h_source);
2868                 } else {
2869                         spin_lock_bh(&mppath->state_lock);
2870                         if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
2871                                 memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
2872                                 update = true;
2873                         }
2874                         mppath->exp_time = jiffies;
2875                         spin_unlock_bh(&mppath->state_lock);
2876                 }
2877
2878                 /* flush fast xmit cache if the address path changed */
2879                 if (update)
2880                         mesh_fast_tx_flush_addr(sdata, proxied_addr);
2881
2882                 rcu_read_unlock();
2883         }
2884
2885         /* Frame has reached destination.  Don't forward */
2886         if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
2887                 goto rx_accept;
2888
2889         if (!--mesh_hdr->ttl) {
2890                 if (multicast)
2891                         goto rx_accept;
2892
2893                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2894                 return RX_DROP_MONITOR;
2895         }
2896
2897         if (!ifmsh->mshcfg.dot11MeshForwarding) {
2898                 if (is_multicast_ether_addr(eth->h_dest))
2899                         goto rx_accept;
2900
2901                 return RX_DROP_MONITOR;
2902         }
2903
2904         skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
2905
2906         if (!multicast &&
2907             ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
2908                 return RX_QUEUED;
2909
2910         ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
2911                                       eth->h_dest, eth->h_source);
2912         hdrlen = ieee80211_hdrlen(hdr.frame_control);
2913         if (multicast) {
2914                 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
2915
2916                 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
2917                                                IEEE80211_ENCRYPT_HEADROOM,
2918                                           tailroom, GFP_ATOMIC);
2919                 if (!fwd_skb)
2920                         goto rx_accept;
2921         } else {
2922                 fwd_skb = skb;
2923                 skb = NULL;
2924
2925                 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
2926                         return RX_DROP_U_OOM;
2927
2928                 if (skb_linearize(fwd_skb))
2929                         return RX_DROP_U_OOM;
2930         }
2931
2932         fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
2933         memcpy(fwd_hdr, &hdr, hdrlen - 2);
2934         qos = ieee80211_get_qos_ctl(fwd_hdr);
2935         qos[0] = qos[1] = 0;
2936
2937         skb_reset_mac_header(fwd_skb);
2938         hdrlen += mesh_hdrlen;
2939         if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
2940                                             &fwd_skb->protocol))
2941                 hdrlen += ETH_ALEN;
2942         else
2943                 fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
2944         skb_set_network_header(fwd_skb, hdrlen + 2);
2945
2946         info = IEEE80211_SKB_CB(fwd_skb);
2947         memset(info, 0, sizeof(*info));
2948         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2949         info->control.vif = &sdata->vif;
2950         info->control.jiffies = jiffies;
2951         fwd_skb->dev = sdata->dev;
2952         if (multicast) {
2953                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2954                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2955                 /* update power mode indication when forwarding */
2956                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2957         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2958                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2959                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2960         } else {
2961                 /* unable to resolve next hop */
2962                 if (sta)
2963                         mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2964                                            hdr.addr3, 0,
2965                                            WLAN_REASON_MESH_PATH_NOFORWARD,
2966                                            sta->sta.addr);
2967                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2968                 kfree_skb(fwd_skb);
2969                 goto rx_accept;
2970         }
2971
2972         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2973         ieee80211_add_pending_skb(local, fwd_skb);
2974
2975 rx_accept:
2976         if (!skb)
2977                 return RX_QUEUED;
2978
2979         ieee80211_strip_8023_mesh_hdr(skb);
2980 #endif
2981
2982         return RX_CONTINUE;
2983 }
2984
2985 static ieee80211_rx_result debug_noinline
2986 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2987 {
2988         struct net_device *dev = rx->sdata->dev;
2989         struct sk_buff *skb = rx->skb;
2990         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2991         __le16 fc = hdr->frame_control;
2992         struct sk_buff_head frame_list;
2993         ieee80211_rx_result res;
2994         struct ethhdr ethhdr;
2995         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2996
2997         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2998                 check_da = NULL;
2999                 check_sa = NULL;
3000         } else switch (rx->sdata->vif.type) {
3001                 case NL80211_IFTYPE_AP:
3002                 case NL80211_IFTYPE_AP_VLAN:
3003                         check_da = NULL;
3004                         break;
3005                 case NL80211_IFTYPE_STATION:
3006                         if (!rx->sta ||
3007                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
3008                                 check_sa = NULL;
3009                         break;
3010                 case NL80211_IFTYPE_MESH_POINT:
3011                         check_sa = NULL;
3012                         check_da = NULL;
3013                         break;
3014                 default:
3015                         break;
3016         }
3017
3018         skb->dev = dev;
3019         __skb_queue_head_init(&frame_list);
3020
3021         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
3022                                           rx->sdata->vif.addr,
3023                                           rx->sdata->vif.type,
3024                                           data_offset, true))
3025                 return RX_DROP_U_BAD_AMSDU;
3026
3027         if (rx->sta->amsdu_mesh_control < 0) {
3028                 s8 valid = -1;
3029                 int i;
3030
3031                 for (i = 0; i <= 2; i++) {
3032                         if (!ieee80211_is_valid_amsdu(skb, i))
3033                                 continue;
3034
3035                         if (valid >= 0) {
3036                                 /* ambiguous */
3037                                 valid = -1;
3038                                 break;
3039                         }
3040
3041                         valid = i;
3042                 }
3043
3044                 rx->sta->amsdu_mesh_control = valid;
3045         }
3046
3047         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
3048                                  rx->sdata->vif.type,
3049                                  rx->local->hw.extra_tx_headroom,
3050                                  check_da, check_sa,
3051                                  rx->sta->amsdu_mesh_control);
3052
3053         while (!skb_queue_empty(&frame_list)) {
3054                 rx->skb = __skb_dequeue(&frame_list);
3055
3056                 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3057                 switch (res) {
3058                 case RX_QUEUED:
3059                         continue;
3060                 case RX_CONTINUE:
3061                         break;
3062                 default:
3063                         goto free;
3064                 }
3065
3066                 if (!ieee80211_frame_allowed(rx, fc))
3067                         goto free;
3068
3069                 ieee80211_deliver_skb(rx);
3070                 continue;
3071
3072 free:
3073                 dev_kfree_skb(rx->skb);
3074         }
3075
3076         return RX_QUEUED;
3077 }
3078
3079 static ieee80211_rx_result debug_noinline
3080 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
3081 {
3082         struct sk_buff *skb = rx->skb;
3083         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3084         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3085         __le16 fc = hdr->frame_control;
3086
3087         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
3088                 return RX_CONTINUE;
3089
3090         if (unlikely(!ieee80211_is_data(fc)))
3091                 return RX_CONTINUE;
3092
3093         if (unlikely(!ieee80211_is_data_present(fc)))
3094                 return RX_DROP_MONITOR;
3095
3096         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3097                 switch (rx->sdata->vif.type) {
3098                 case NL80211_IFTYPE_AP_VLAN:
3099                         if (!rx->sdata->u.vlan.sta)
3100                                 return RX_DROP_U_BAD_4ADDR;
3101                         break;
3102                 case NL80211_IFTYPE_STATION:
3103                         if (!rx->sdata->u.mgd.use_4addr)
3104                                 return RX_DROP_U_BAD_4ADDR;
3105                         break;
3106                 case NL80211_IFTYPE_MESH_POINT:
3107                         break;
3108                 default:
3109                         return RX_DROP_U_BAD_4ADDR;
3110                 }
3111         }
3112
3113         if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
3114                 return RX_DROP_U_BAD_AMSDU;
3115
3116         if (rx->key) {
3117                 /*
3118                  * We should not receive A-MSDUs on pre-HT connections,
3119                  * and HT connections cannot use old ciphers. Thus drop
3120                  * them, as in those cases we couldn't even have SPP
3121                  * A-MSDUs or such.
3122                  */
3123                 switch (rx->key->conf.cipher) {
3124                 case WLAN_CIPHER_SUITE_WEP40:
3125                 case WLAN_CIPHER_SUITE_WEP104:
3126                 case WLAN_CIPHER_SUITE_TKIP:
3127                         return RX_DROP_U_BAD_AMSDU_CIPHER;
3128                 default:
3129                         break;
3130                 }
3131         }
3132
3133         return __ieee80211_rx_h_amsdu(rx, 0);
3134 }
3135
3136 static ieee80211_rx_result debug_noinline
3137 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3138 {
3139         struct ieee80211_sub_if_data *sdata = rx->sdata;
3140         struct ieee80211_local *local = rx->local;
3141         struct net_device *dev = sdata->dev;
3142         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3143         __le16 fc = hdr->frame_control;
3144         ieee80211_rx_result res;
3145         bool port_control;
3146
3147         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3148                 return RX_CONTINUE;
3149
3150         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3151                 return RX_DROP_MONITOR;
3152
3153         /*
3154          * Send unexpected-4addr-frame event to hostapd. For older versions,
3155          * also drop the frame to cooked monitor interfaces.
3156          */
3157         if (ieee80211_has_a4(hdr->frame_control) &&
3158             sdata->vif.type == NL80211_IFTYPE_AP) {
3159                 if (rx->sta &&
3160                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3161                         cfg80211_rx_unexpected_4addr_frame(
3162                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3163                 return RX_DROP_MONITOR;
3164         }
3165
3166         res = __ieee80211_data_to_8023(rx, &port_control);
3167         if (unlikely(res != RX_CONTINUE))
3168                 return res;
3169
3170         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3171         if (res != RX_CONTINUE)
3172                 return res;
3173
3174         if (!ieee80211_frame_allowed(rx, fc))
3175                 return RX_DROP_MONITOR;
3176
3177         /* directly handle TDLS channel switch requests/responses */
3178         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3179                                                 cpu_to_be16(ETH_P_TDLS))) {
3180                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3181
3182                 if (pskb_may_pull(rx->skb,
3183                                   offsetof(struct ieee80211_tdls_data, u)) &&
3184                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3185                     tf->category == WLAN_CATEGORY_TDLS &&
3186                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3187                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3188                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3189                         __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3190                                                        rx->sta, rx->skb);
3191                         return RX_QUEUED;
3192                 }
3193         }
3194
3195         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3196             unlikely(port_control) && sdata->bss) {
3197                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3198                                      u.ap);
3199                 dev = sdata->dev;
3200                 rx->sdata = sdata;
3201         }
3202
3203         rx->skb->dev = dev;
3204
3205         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3206             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3207             !is_multicast_ether_addr(
3208                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3209             (!local->scanning &&
3210              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3211                 mod_timer(&local->dynamic_ps_timer, jiffies +
3212                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3213
3214         ieee80211_deliver_skb(rx);
3215
3216         return RX_QUEUED;
3217 }
3218
3219 static ieee80211_rx_result debug_noinline
3220 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3221 {
3222         struct sk_buff *skb = rx->skb;
3223         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3224         struct tid_ampdu_rx *tid_agg_rx;
3225         u16 start_seq_num;
3226         u16 tid;
3227
3228         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3229                 return RX_CONTINUE;
3230
3231         if (ieee80211_is_back_req(bar->frame_control)) {
3232                 struct {
3233                         __le16 control, start_seq_num;
3234                 } __packed bar_data;
3235                 struct ieee80211_event event = {
3236                         .type = BAR_RX_EVENT,
3237                 };
3238
3239                 if (!rx->sta)
3240                         return RX_DROP_MONITOR;
3241
3242                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3243                                   &bar_data, sizeof(bar_data)))
3244                         return RX_DROP_MONITOR;
3245
3246                 tid = le16_to_cpu(bar_data.control) >> 12;
3247
3248                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3249                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3250                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3251                                              WLAN_BACK_RECIPIENT,
3252                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3253
3254                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3255                 if (!tid_agg_rx)
3256                         return RX_DROP_MONITOR;
3257
3258                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3259                 event.u.ba.tid = tid;
3260                 event.u.ba.ssn = start_seq_num;
3261                 event.u.ba.sta = &rx->sta->sta;
3262
3263                 /* reset session timer */
3264                 if (tid_agg_rx->timeout)
3265                         mod_timer(&tid_agg_rx->session_timer,
3266                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3267
3268                 spin_lock(&tid_agg_rx->reorder_lock);
3269                 /* release stored frames up to start of BAR */
3270                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3271                                                  start_seq_num, frames);
3272                 spin_unlock(&tid_agg_rx->reorder_lock);
3273
3274                 drv_event_callback(rx->local, rx->sdata, &event);
3275
3276                 kfree_skb(skb);
3277                 return RX_QUEUED;
3278         }
3279
3280         /*
3281          * After this point, we only want management frames,
3282          * so we can drop all remaining control frames to
3283          * cooked monitor interfaces.
3284          */
3285         return RX_DROP_MONITOR;
3286 }
3287
3288 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3289                                            struct ieee80211_mgmt *mgmt,
3290                                            size_t len)
3291 {
3292         struct ieee80211_local *local = sdata->local;
3293         struct sk_buff *skb;
3294         struct ieee80211_mgmt *resp;
3295
3296         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3297                 /* Not to own unicast address */
3298                 return;
3299         }
3300
3301         if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3302             !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3303                 /* Not from the current AP or not associated yet. */
3304                 return;
3305         }
3306
3307         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3308                 /* Too short SA Query request frame */
3309                 return;
3310         }
3311
3312         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3313         if (skb == NULL)
3314                 return;
3315
3316         skb_reserve(skb, local->hw.extra_tx_headroom);
3317         resp = skb_put_zero(skb, 24);
3318         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3319         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3320         memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3321         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3322                                           IEEE80211_STYPE_ACTION);
3323         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3324         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3325         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3326         memcpy(resp->u.action.u.sa_query.trans_id,
3327                mgmt->u.action.u.sa_query.trans_id,
3328                WLAN_SA_QUERY_TR_ID_LEN);
3329
3330         ieee80211_tx_skb(sdata, skb);
3331 }
3332
3333 static void
3334 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3335 {
3336         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3337         const struct element *ie;
3338         size_t baselen;
3339
3340         if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3341                                      NL80211_EXT_FEATURE_BSS_COLOR))
3342                 return;
3343
3344         if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3345                 return;
3346
3347         if (rx->sdata->vif.bss_conf.csa_active)
3348                 return;
3349
3350         baselen = mgmt->u.beacon.variable - rx->skb->data;
3351         if (baselen > rx->skb->len)
3352                 return;
3353
3354         ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3355                                     mgmt->u.beacon.variable,
3356                                     rx->skb->len - baselen);
3357         if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3358             ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3359                 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3360                 const struct ieee80211_he_operation *he_oper;
3361                 u8 color;
3362
3363                 he_oper = (void *)(ie->data + 1);
3364                 if (le32_get_bits(he_oper->he_oper_params,
3365                                   IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3366                         return;
3367
3368                 color = le32_get_bits(he_oper->he_oper_params,
3369                                       IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3370                 if (color == bss_conf->he_bss_color.color)
3371                         ieee80211_obss_color_collision_notify(&rx->sdata->vif,
3372                                                               BIT_ULL(color),
3373                                                               GFP_ATOMIC);
3374         }
3375 }
3376
3377 static ieee80211_rx_result debug_noinline
3378 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3379 {
3380         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3381         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3382
3383         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3384                 return RX_CONTINUE;
3385
3386         /*
3387          * From here on, look only at management frames.
3388          * Data and control frames are already handled,
3389          * and unknown (reserved) frames are useless.
3390          */
3391         if (rx->skb->len < 24)
3392                 return RX_DROP_MONITOR;
3393
3394         if (!ieee80211_is_mgmt(mgmt->frame_control))
3395                 return RX_DROP_MONITOR;
3396
3397         /* drop too small action frames */
3398         if (ieee80211_is_action(mgmt->frame_control) &&
3399             rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
3400                 return RX_DROP_U_RUNT_ACTION;
3401
3402         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3403             ieee80211_is_beacon(mgmt->frame_control) &&
3404             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3405                 int sig = 0;
3406
3407                 /* sw bss color collision detection */
3408                 ieee80211_rx_check_bss_color_collision(rx);
3409
3410                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3411                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3412                         sig = status->signal;
3413
3414                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3415                                                 rx->skb->data, rx->skb->len,
3416                                                 ieee80211_rx_status_to_khz(status),
3417                                                 sig);
3418                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3419         }
3420
3421         return ieee80211_drop_unencrypted_mgmt(rx);
3422 }
3423
3424 static bool
3425 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3426 {
3427         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3428         struct ieee80211_sub_if_data *sdata = rx->sdata;
3429
3430         /* TWT actions are only supported in AP for the moment */
3431         if (sdata->vif.type != NL80211_IFTYPE_AP)
3432                 return false;
3433
3434         if (!rx->local->ops->add_twt_setup)
3435                 return false;
3436
3437         if (!sdata->vif.bss_conf.twt_responder)
3438                 return false;
3439
3440         if (!rx->sta)
3441                 return false;
3442
3443         switch (mgmt->u.action.u.s1g.action_code) {
3444         case WLAN_S1G_TWT_SETUP: {
3445                 struct ieee80211_twt_setup *twt;
3446
3447                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3448                                    1 + /* action code */
3449                                    sizeof(struct ieee80211_twt_setup) +
3450                                    2 /* TWT req_type agrt */)
3451                         break;
3452
3453                 twt = (void *)mgmt->u.action.u.s1g.variable;
3454                 if (twt->element_id != WLAN_EID_S1G_TWT)
3455                         break;
3456
3457                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3458                                    4 + /* action code + token + tlv */
3459                                    twt->length)
3460                         break;
3461
3462                 return true; /* queue the frame */
3463         }
3464         case WLAN_S1G_TWT_TEARDOWN:
3465                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3466                         break;
3467
3468                 return true; /* queue the frame */
3469         default:
3470                 break;
3471         }
3472
3473         return false;
3474 }
3475
3476 static ieee80211_rx_result debug_noinline
3477 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3478 {
3479         struct ieee80211_local *local = rx->local;
3480         struct ieee80211_sub_if_data *sdata = rx->sdata;
3481         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3482         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3483         int len = rx->skb->len;
3484
3485         if (!ieee80211_is_action(mgmt->frame_control))
3486                 return RX_CONTINUE;
3487
3488         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3489             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3490             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3491                 return RX_DROP_U_ACTION_UNKNOWN_SRC;
3492
3493         switch (mgmt->u.action.category) {
3494         case WLAN_CATEGORY_HT:
3495                 /* reject HT action frames from stations not supporting HT */
3496                 if (!rx->link_sta->pub->ht_cap.ht_supported)
3497                         goto invalid;
3498
3499                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3500                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3501                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3502                     sdata->vif.type != NL80211_IFTYPE_AP &&
3503                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3504                         break;
3505
3506                 /* verify action & smps_control/chanwidth are present */
3507                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3508                         goto invalid;
3509
3510                 switch (mgmt->u.action.u.ht_smps.action) {
3511                 case WLAN_HT_ACTION_SMPS: {
3512                         struct ieee80211_supported_band *sband;
3513                         enum ieee80211_smps_mode smps_mode;
3514                         struct sta_opmode_info sta_opmode = {};
3515
3516                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3517                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3518                                 goto handled;
3519
3520                         /* convert to HT capability */
3521                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3522                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3523                                 smps_mode = IEEE80211_SMPS_OFF;
3524                                 break;
3525                         case WLAN_HT_SMPS_CONTROL_STATIC:
3526                                 smps_mode = IEEE80211_SMPS_STATIC;
3527                                 break;
3528                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3529                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3530                                 break;
3531                         default:
3532                                 goto invalid;
3533                         }
3534
3535                         /* if no change do nothing */
3536                         if (rx->link_sta->pub->smps_mode == smps_mode)
3537                                 goto handled;
3538                         rx->link_sta->pub->smps_mode = smps_mode;
3539                         sta_opmode.smps_mode =
3540                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3541                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3542
3543                         sband = rx->local->hw.wiphy->bands[status->band];
3544
3545                         rate_control_rate_update(local, sband, rx->sta, 0,
3546                                                  IEEE80211_RC_SMPS_CHANGED);
3547                         cfg80211_sta_opmode_change_notify(sdata->dev,
3548                                                           rx->sta->addr,
3549                                                           &sta_opmode,
3550                                                           GFP_ATOMIC);
3551                         goto handled;
3552                 }
3553                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3554                         struct ieee80211_supported_band *sband;
3555                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3556                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3557                         struct sta_opmode_info sta_opmode = {};
3558
3559                         /* If it doesn't support 40 MHz it can't change ... */
3560                         if (!(rx->link_sta->pub->ht_cap.cap &
3561                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3562                                 goto handled;
3563
3564                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3565                                 max_bw = IEEE80211_STA_RX_BW_20;
3566                         else
3567                                 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3568
3569                         /* set cur_max_bandwidth and recalc sta bw */
3570                         rx->link_sta->cur_max_bandwidth = max_bw;
3571                         new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3572
3573                         if (rx->link_sta->pub->bandwidth == new_bw)
3574                                 goto handled;
3575
3576                         rx->link_sta->pub->bandwidth = new_bw;
3577                         sband = rx->local->hw.wiphy->bands[status->band];
3578                         sta_opmode.bw =
3579                                 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3580                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3581
3582                         rate_control_rate_update(local, sband, rx->sta, 0,
3583                                                  IEEE80211_RC_BW_CHANGED);
3584                         cfg80211_sta_opmode_change_notify(sdata->dev,
3585                                                           rx->sta->addr,
3586                                                           &sta_opmode,
3587                                                           GFP_ATOMIC);
3588                         goto handled;
3589                 }
3590                 default:
3591                         goto invalid;
3592                 }
3593
3594                 break;
3595         case WLAN_CATEGORY_PUBLIC:
3596                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3597                         goto invalid;
3598                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3599                         break;
3600                 if (!rx->sta)
3601                         break;
3602                 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3603                         break;
3604                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3605                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3606                         break;
3607                 if (len < offsetof(struct ieee80211_mgmt,
3608                                    u.action.u.ext_chan_switch.variable))
3609                         goto invalid;
3610                 goto queue;
3611         case WLAN_CATEGORY_VHT:
3612                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3613                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3614                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3615                     sdata->vif.type != NL80211_IFTYPE_AP &&
3616                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3617                         break;
3618
3619                 /* verify action code is present */
3620                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3621                         goto invalid;
3622
3623                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3624                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3625                         /* verify opmode is present */
3626                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3627                                 goto invalid;
3628                         goto queue;
3629                 }
3630                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3631                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3632                                 goto invalid;
3633                         goto queue;
3634                 }
3635                 default:
3636                         break;
3637                 }
3638                 break;
3639         case WLAN_CATEGORY_BACK:
3640                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3641                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3642                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3643                     sdata->vif.type != NL80211_IFTYPE_AP &&
3644                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3645                         break;
3646
3647                 /* verify action_code is present */
3648                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3649                         break;
3650
3651                 switch (mgmt->u.action.u.addba_req.action_code) {
3652                 case WLAN_ACTION_ADDBA_REQ:
3653                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3654                                    sizeof(mgmt->u.action.u.addba_req)))
3655                                 goto invalid;
3656                         break;
3657                 case WLAN_ACTION_ADDBA_RESP:
3658                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3659                                    sizeof(mgmt->u.action.u.addba_resp)))
3660                                 goto invalid;
3661                         break;
3662                 case WLAN_ACTION_DELBA:
3663                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3664                                    sizeof(mgmt->u.action.u.delba)))
3665                                 goto invalid;
3666                         break;
3667                 default:
3668                         goto invalid;
3669                 }
3670
3671                 goto queue;
3672         case WLAN_CATEGORY_SPECTRUM_MGMT:
3673                 /* verify action_code is present */
3674                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3675                         break;
3676
3677                 switch (mgmt->u.action.u.measurement.action_code) {
3678                 case WLAN_ACTION_SPCT_MSR_REQ:
3679                         if (status->band != NL80211_BAND_5GHZ)
3680                                 break;
3681
3682                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3683                                    sizeof(mgmt->u.action.u.measurement)))
3684                                 break;
3685
3686                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3687                                 break;
3688
3689                         ieee80211_process_measurement_req(sdata, mgmt, len);
3690                         goto handled;
3691                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3692                         u8 *bssid;
3693                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3694                                    sizeof(mgmt->u.action.u.chan_switch)))
3695                                 break;
3696
3697                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3698                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3699                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3700                                 break;
3701
3702                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3703                                 bssid = sdata->deflink.u.mgd.bssid;
3704                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3705                                 bssid = sdata->u.ibss.bssid;
3706                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3707                                 bssid = mgmt->sa;
3708                         else
3709                                 break;
3710
3711                         if (!ether_addr_equal(mgmt->bssid, bssid))
3712                                 break;
3713
3714                         goto queue;
3715                         }
3716                 }
3717                 break;
3718         case WLAN_CATEGORY_SELF_PROTECTED:
3719                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3720                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3721                         break;
3722
3723                 switch (mgmt->u.action.u.self_prot.action_code) {
3724                 case WLAN_SP_MESH_PEERING_OPEN:
3725                 case WLAN_SP_MESH_PEERING_CLOSE:
3726                 case WLAN_SP_MESH_PEERING_CONFIRM:
3727                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3728                                 goto invalid;
3729                         if (sdata->u.mesh.user_mpm)
3730                                 /* userspace handles this frame */
3731                                 break;
3732                         goto queue;
3733                 case WLAN_SP_MGK_INFORM:
3734                 case WLAN_SP_MGK_ACK:
3735                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3736                                 goto invalid;
3737                         break;
3738                 }
3739                 break;
3740         case WLAN_CATEGORY_MESH_ACTION:
3741                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3742                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3743                         break;
3744
3745                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3746                         break;
3747                 if (mesh_action_is_path_sel(mgmt) &&
3748                     !mesh_path_sel_is_hwmp(sdata))
3749                         break;
3750                 goto queue;
3751         case WLAN_CATEGORY_S1G:
3752                 if (len < offsetofend(typeof(*mgmt),
3753                                       u.action.u.s1g.action_code))
3754                         break;
3755
3756                 switch (mgmt->u.action.u.s1g.action_code) {
3757                 case WLAN_S1G_TWT_SETUP:
3758                 case WLAN_S1G_TWT_TEARDOWN:
3759                         if (ieee80211_process_rx_twt_action(rx))
3760                                 goto queue;
3761                         break;
3762                 default:
3763                         break;
3764                 }
3765                 break;
3766         }
3767
3768         return RX_CONTINUE;
3769
3770  invalid:
3771         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3772         /* will return in the next handlers */
3773         return RX_CONTINUE;
3774
3775  handled:
3776         if (rx->sta)
3777                 rx->link_sta->rx_stats.packets++;
3778         dev_kfree_skb(rx->skb);
3779         return RX_QUEUED;
3780
3781  queue:
3782         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3783         return RX_QUEUED;
3784 }
3785
3786 static ieee80211_rx_result debug_noinline
3787 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3788 {
3789         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3790         struct cfg80211_rx_info info = {
3791                 .freq = ieee80211_rx_status_to_khz(status),
3792                 .buf = rx->skb->data,
3793                 .len = rx->skb->len,
3794                 .link_id = rx->link_id,
3795                 .have_link_id = rx->link_id >= 0,
3796         };
3797
3798         /* skip known-bad action frames and return them in the next handler */
3799         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3800                 return RX_CONTINUE;
3801
3802         /*
3803          * Getting here means the kernel doesn't know how to handle
3804          * it, but maybe userspace does ... include returned frames
3805          * so userspace can register for those to know whether ones
3806          * it transmitted were processed or returned.
3807          */
3808
3809         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3810             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3811                 info.sig_dbm = status->signal;
3812
3813         if (ieee80211_is_timing_measurement(rx->skb) ||
3814             ieee80211_is_ftm(rx->skb)) {
3815                 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3816                 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3817         }
3818
3819         if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3820                 if (rx->sta)
3821                         rx->link_sta->rx_stats.packets++;
3822                 dev_kfree_skb(rx->skb);
3823                 return RX_QUEUED;
3824         }
3825
3826         return RX_CONTINUE;
3827 }
3828
3829 static ieee80211_rx_result debug_noinline
3830 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3831 {
3832         struct ieee80211_sub_if_data *sdata = rx->sdata;
3833         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3834         int len = rx->skb->len;
3835
3836         if (!ieee80211_is_action(mgmt->frame_control))
3837                 return RX_CONTINUE;
3838
3839         switch (mgmt->u.action.category) {
3840         case WLAN_CATEGORY_SA_QUERY:
3841                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3842                            sizeof(mgmt->u.action.u.sa_query)))
3843                         break;
3844
3845                 switch (mgmt->u.action.u.sa_query.action) {
3846                 case WLAN_ACTION_SA_QUERY_REQUEST:
3847                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3848                                 break;
3849                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3850                         goto handled;
3851                 }
3852                 break;
3853         }
3854
3855         return RX_CONTINUE;
3856
3857  handled:
3858         if (rx->sta)
3859                 rx->link_sta->rx_stats.packets++;
3860         dev_kfree_skb(rx->skb);
3861         return RX_QUEUED;
3862 }
3863
3864 static ieee80211_rx_result debug_noinline
3865 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3866 {
3867         struct ieee80211_local *local = rx->local;
3868         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3869         struct sk_buff *nskb;
3870         struct ieee80211_sub_if_data *sdata = rx->sdata;
3871         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3872
3873         if (!ieee80211_is_action(mgmt->frame_control))
3874                 return RX_CONTINUE;
3875
3876         /*
3877          * For AP mode, hostapd is responsible for handling any action
3878          * frames that we didn't handle, including returning unknown
3879          * ones. For all other modes we will return them to the sender,
3880          * setting the 0x80 bit in the action category, as required by
3881          * 802.11-2012 9.24.4.
3882          * Newer versions of hostapd shall also use the management frame
3883          * registration mechanisms, but older ones still use cooked
3884          * monitor interfaces so push all frames there.
3885          */
3886         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3887             (sdata->vif.type == NL80211_IFTYPE_AP ||
3888              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3889                 return RX_DROP_MONITOR;
3890
3891         if (is_multicast_ether_addr(mgmt->da))
3892                 return RX_DROP_MONITOR;
3893
3894         /* do not return rejected action frames */
3895         if (mgmt->u.action.category & 0x80)
3896                 return RX_DROP_U_REJECTED_ACTION_RESPONSE;
3897
3898         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3899                                GFP_ATOMIC);
3900         if (nskb) {
3901                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3902
3903                 nmgmt->u.action.category |= 0x80;
3904                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3905                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3906
3907                 memset(nskb->cb, 0, sizeof(nskb->cb));
3908
3909                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3910                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3911
3912                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3913                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3914                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3915                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3916                                 info->hw_queue =
3917                                         local->hw.offchannel_tx_hw_queue;
3918                 }
3919
3920                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3921                                             status->band);
3922         }
3923         dev_kfree_skb(rx->skb);
3924         return RX_QUEUED;
3925 }
3926
3927 static ieee80211_rx_result debug_noinline
3928 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3929 {
3930         struct ieee80211_sub_if_data *sdata = rx->sdata;
3931         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3932
3933         if (!ieee80211_is_ext(hdr->frame_control))
3934                 return RX_CONTINUE;
3935
3936         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3937                 return RX_DROP_MONITOR;
3938
3939         /* for now only beacons are ext, so queue them */
3940         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3941
3942         return RX_QUEUED;
3943 }
3944
3945 static ieee80211_rx_result debug_noinline
3946 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3947 {
3948         struct ieee80211_sub_if_data *sdata = rx->sdata;
3949         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3950         __le16 stype;
3951
3952         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3953
3954         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3955             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3956             sdata->vif.type != NL80211_IFTYPE_OCB &&
3957             sdata->vif.type != NL80211_IFTYPE_STATION)
3958                 return RX_DROP_MONITOR;
3959
3960         switch (stype) {
3961         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3962         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3963         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3964                 /* process for all: mesh, mlme, ibss */
3965                 break;
3966         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3967                 if (is_multicast_ether_addr(mgmt->da) &&
3968                     !is_broadcast_ether_addr(mgmt->da))
3969                         return RX_DROP_MONITOR;
3970
3971                 /* process only for station/IBSS */
3972                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3973                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3974                         return RX_DROP_MONITOR;
3975                 break;
3976         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3977         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3978         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3979                 if (is_multicast_ether_addr(mgmt->da) &&
3980                     !is_broadcast_ether_addr(mgmt->da))
3981                         return RX_DROP_MONITOR;
3982
3983                 /* process only for station */
3984                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3985                         return RX_DROP_MONITOR;
3986                 break;
3987         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3988                 /* process only for ibss and mesh */
3989                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3990                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3991                         return RX_DROP_MONITOR;
3992                 break;
3993         default:
3994                 return RX_DROP_MONITOR;
3995         }
3996
3997         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3998
3999         return RX_QUEUED;
4000 }
4001
4002 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
4003                                         struct ieee80211_rate *rate,
4004                                         ieee80211_rx_result reason)
4005 {
4006         struct ieee80211_sub_if_data *sdata;
4007         struct ieee80211_local *local = rx->local;
4008         struct sk_buff *skb = rx->skb, *skb2;
4009         struct net_device *prev_dev = NULL;
4010         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4011         int needed_headroom;
4012
4013         /*
4014          * If cooked monitor has been processed already, then
4015          * don't do it again. If not, set the flag.
4016          */
4017         if (rx->flags & IEEE80211_RX_CMNTR)
4018                 goto out_free_skb;
4019         rx->flags |= IEEE80211_RX_CMNTR;
4020
4021         /* If there are no cooked monitor interfaces, just free the SKB */
4022         if (!local->cooked_mntrs)
4023                 goto out_free_skb;
4024
4025         /* room for the radiotap header based on driver features */
4026         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
4027
4028         if (skb_headroom(skb) < needed_headroom &&
4029             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
4030                 goto out_free_skb;
4031
4032         /* prepend radiotap information */
4033         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
4034                                          false);
4035
4036         skb_reset_mac_header(skb);
4037         skb->ip_summed = CHECKSUM_UNNECESSARY;
4038         skb->pkt_type = PACKET_OTHERHOST;
4039         skb->protocol = htons(ETH_P_802_2);
4040
4041         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4042                 if (!ieee80211_sdata_running(sdata))
4043                         continue;
4044
4045                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
4046                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
4047                         continue;
4048
4049                 if (prev_dev) {
4050                         skb2 = skb_clone(skb, GFP_ATOMIC);
4051                         if (skb2) {
4052                                 skb2->dev = prev_dev;
4053                                 netif_receive_skb(skb2);
4054                         }
4055                 }
4056
4057                 prev_dev = sdata->dev;
4058                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
4059         }
4060
4061         if (prev_dev) {
4062                 skb->dev = prev_dev;
4063                 netif_receive_skb(skb);
4064                 return;
4065         }
4066
4067  out_free_skb:
4068         kfree_skb_reason(skb, (__force u32)reason);
4069 }
4070
4071 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
4072                                          ieee80211_rx_result res)
4073 {
4074         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4075         struct ieee80211_supported_band *sband;
4076         struct ieee80211_rate *rate = NULL;
4077
4078         if (res == RX_QUEUED) {
4079                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
4080                 return;
4081         }
4082
4083         if (res != RX_CONTINUE) {
4084                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
4085                 if (rx->sta)
4086                         rx->link_sta->rx_stats.dropped++;
4087         }
4088
4089         if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) ==
4090                         SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) {
4091                 kfree_skb_reason(rx->skb, (__force u32)res);
4092                 return;
4093         }
4094
4095         sband = rx->local->hw.wiphy->bands[status->band];
4096         if (status->encoding == RX_ENC_LEGACY)
4097                 rate = &sband->bitrates[status->rate_idx];
4098
4099         ieee80211_rx_cooked_monitor(rx, rate, res);
4100 }
4101
4102 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
4103                                   struct sk_buff_head *frames)
4104 {
4105         ieee80211_rx_result res = RX_DROP_MONITOR;
4106         struct sk_buff *skb;
4107
4108 #define CALL_RXH(rxh)                   \
4109         do {                            \
4110                 res = rxh(rx);          \
4111                 if (res != RX_CONTINUE) \
4112                         goto rxh_next;  \
4113         } while (0)
4114
4115         /* Lock here to avoid hitting all of the data used in the RX
4116          * path (e.g. key data, station data, ...) concurrently when
4117          * a frame is released from the reorder buffer due to timeout
4118          * from the timer, potentially concurrently with RX from the
4119          * driver.
4120          */
4121         spin_lock_bh(&rx->local->rx_path_lock);
4122
4123         while ((skb = __skb_dequeue(frames))) {
4124                 /*
4125                  * all the other fields are valid across frames
4126                  * that belong to an aMPDU since they are on the
4127                  * same TID from the same station
4128                  */
4129                 rx->skb = skb;
4130
4131                 if (WARN_ON_ONCE(!rx->link))
4132                         goto rxh_next;
4133
4134                 CALL_RXH(ieee80211_rx_h_check_more_data);
4135                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4136                 CALL_RXH(ieee80211_rx_h_sta_process);
4137                 CALL_RXH(ieee80211_rx_h_decrypt);
4138                 CALL_RXH(ieee80211_rx_h_defragment);
4139                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4140                 /* must be after MMIC verify so header is counted in MPDU mic */
4141                 CALL_RXH(ieee80211_rx_h_amsdu);
4142                 CALL_RXH(ieee80211_rx_h_data);
4143
4144                 /* special treatment -- needs the queue */
4145                 res = ieee80211_rx_h_ctrl(rx, frames);
4146                 if (res != RX_CONTINUE)
4147                         goto rxh_next;
4148
4149                 CALL_RXH(ieee80211_rx_h_mgmt_check);
4150                 CALL_RXH(ieee80211_rx_h_action);
4151                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4152                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4153                 CALL_RXH(ieee80211_rx_h_action_return);
4154                 CALL_RXH(ieee80211_rx_h_ext);
4155                 CALL_RXH(ieee80211_rx_h_mgmt);
4156
4157  rxh_next:
4158                 ieee80211_rx_handlers_result(rx, res);
4159
4160 #undef CALL_RXH
4161         }
4162
4163         spin_unlock_bh(&rx->local->rx_path_lock);
4164 }
4165
4166 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4167 {
4168         struct sk_buff_head reorder_release;
4169         ieee80211_rx_result res = RX_DROP_MONITOR;
4170
4171         __skb_queue_head_init(&reorder_release);
4172
4173 #define CALL_RXH(rxh)                   \
4174         do {                            \
4175                 res = rxh(rx);          \
4176                 if (res != RX_CONTINUE) \
4177                         goto rxh_next;  \
4178         } while (0)
4179
4180         CALL_RXH(ieee80211_rx_h_check_dup);
4181         CALL_RXH(ieee80211_rx_h_check);
4182
4183         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4184
4185         ieee80211_rx_handlers(rx, &reorder_release);
4186         return;
4187
4188  rxh_next:
4189         ieee80211_rx_handlers_result(rx, res);
4190
4191 #undef CALL_RXH
4192 }
4193
4194 static bool
4195 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4196 {
4197         return !!(sta->valid_links & BIT(link_id));
4198 }
4199
4200 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
4201                                        u8 link_id)
4202 {
4203         rx->link_id = link_id;
4204         rx->link = rcu_dereference(rx->sdata->link[link_id]);
4205
4206         if (!rx->sta)
4207                 return rx->link;
4208
4209         if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
4210                 return false;
4211
4212         rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
4213
4214         return rx->link && rx->link_sta;
4215 }
4216
4217 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
4218                                       struct sta_info *sta, int link_id)
4219 {
4220         rx->link_id = link_id;
4221         rx->sta = sta;
4222
4223         if (sta) {
4224                 rx->local = sta->sdata->local;
4225                 if (!rx->sdata)
4226                         rx->sdata = sta->sdata;
4227                 rx->link_sta = &sta->deflink;
4228         } else {
4229                 rx->link_sta = NULL;
4230         }
4231
4232         if (link_id < 0)
4233                 rx->link = &rx->sdata->deflink;
4234         else if (!ieee80211_rx_data_set_link(rx, link_id))
4235                 return false;
4236
4237         return true;
4238 }
4239
4240 /*
4241  * This function makes calls into the RX path, therefore
4242  * it has to be invoked under RCU read lock.
4243  */
4244 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4245 {
4246         struct sk_buff_head frames;
4247         struct ieee80211_rx_data rx = {
4248                 /* This is OK -- must be QoS data frame */
4249                 .security_idx = tid,
4250                 .seqno_idx = tid,
4251         };
4252         struct tid_ampdu_rx *tid_agg_rx;
4253         int link_id = -1;
4254
4255         /* FIXME: statistics won't be right with this */
4256         if (sta->sta.valid_links)
4257                 link_id = ffs(sta->sta.valid_links) - 1;
4258
4259         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
4260                 return;
4261
4262         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4263         if (!tid_agg_rx)
4264                 return;
4265
4266         __skb_queue_head_init(&frames);
4267
4268         spin_lock(&tid_agg_rx->reorder_lock);
4269         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4270         spin_unlock(&tid_agg_rx->reorder_lock);
4271
4272         if (!skb_queue_empty(&frames)) {
4273                 struct ieee80211_event event = {
4274                         .type = BA_FRAME_TIMEOUT,
4275                         .u.ba.tid = tid,
4276                         .u.ba.sta = &sta->sta,
4277                 };
4278                 drv_event_callback(rx.local, rx.sdata, &event);
4279         }
4280
4281         ieee80211_rx_handlers(&rx, &frames);
4282 }
4283
4284 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4285                                           u16 ssn, u64 filtered,
4286                                           u16 received_mpdus)
4287 {
4288         struct ieee80211_local *local;
4289         struct sta_info *sta;
4290         struct tid_ampdu_rx *tid_agg_rx;
4291         struct sk_buff_head frames;
4292         struct ieee80211_rx_data rx = {
4293                 /* This is OK -- must be QoS data frame */
4294                 .security_idx = tid,
4295                 .seqno_idx = tid,
4296         };
4297         int i, diff;
4298
4299         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4300                 return;
4301
4302         __skb_queue_head_init(&frames);
4303
4304         sta = container_of(pubsta, struct sta_info, sta);
4305
4306         local = sta->sdata->local;
4307         WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
4308                   "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
4309                   local->hw.max_rx_aggregation_subframes);
4310
4311         if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
4312                 return;
4313
4314         rcu_read_lock();
4315         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4316         if (!tid_agg_rx)
4317                 goto out;
4318
4319         spin_lock_bh(&tid_agg_rx->reorder_lock);
4320
4321         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4322                 int release;
4323
4324                 /* release all frames in the reorder buffer */
4325                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4326                            IEEE80211_SN_MODULO;
4327                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4328                                                  release, &frames);
4329                 /* update ssn to match received ssn */
4330                 tid_agg_rx->head_seq_num = ssn;
4331         } else {
4332                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4333                                                  &frames);
4334         }
4335
4336         /* handle the case that received ssn is behind the mac ssn.
4337          * it can be tid_agg_rx->buf_size behind and still be valid */
4338         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4339         if (diff >= tid_agg_rx->buf_size) {
4340                 tid_agg_rx->reorder_buf_filtered = 0;
4341                 goto release;
4342         }
4343         filtered = filtered >> diff;
4344         ssn += diff;
4345
4346         /* update bitmap */
4347         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4348                 int index = (ssn + i) % tid_agg_rx->buf_size;
4349
4350                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4351                 if (filtered & BIT_ULL(i))
4352                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4353         }
4354
4355         /* now process also frames that the filter marking released */
4356         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4357
4358 release:
4359         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4360
4361         ieee80211_rx_handlers(&rx, &frames);
4362
4363  out:
4364         rcu_read_unlock();
4365 }
4366 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4367
4368 /* main receive path */
4369
4370 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4371 {
4372         return ether_addr_equal(raddr, addr) ||
4373                is_broadcast_ether_addr(raddr);
4374 }
4375
4376 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4377 {
4378         struct ieee80211_sub_if_data *sdata = rx->sdata;
4379         struct sk_buff *skb = rx->skb;
4380         struct ieee80211_hdr *hdr = (void *)skb->data;
4381         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4382         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4383         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4384                          ieee80211_is_s1g_beacon(hdr->frame_control);
4385
4386         switch (sdata->vif.type) {
4387         case NL80211_IFTYPE_STATION:
4388                 if (!bssid && !sdata->u.mgd.use_4addr)
4389                         return false;
4390                 if (ieee80211_is_first_frag(hdr->seq_ctrl) &&
4391                     ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4392                         return false;
4393                 if (multicast)
4394                         return true;
4395                 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4396         case NL80211_IFTYPE_ADHOC:
4397                 if (!bssid)
4398                         return false;
4399                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4400                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4401                     !is_valid_ether_addr(hdr->addr2))
4402                         return false;
4403                 if (ieee80211_is_beacon(hdr->frame_control))
4404                         return true;
4405                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4406                         return false;
4407                 if (!multicast &&
4408                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4409                         return false;
4410                 if (!rx->sta) {
4411                         int rate_idx;
4412                         if (status->encoding != RX_ENC_LEGACY)
4413                                 rate_idx = 0; /* TODO: HT/VHT rates */
4414                         else
4415                                 rate_idx = status->rate_idx;
4416                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4417                                                  BIT(rate_idx));
4418                 }
4419                 return true;
4420         case NL80211_IFTYPE_OCB:
4421                 if (!bssid)
4422                         return false;
4423                 if (!ieee80211_is_data_present(hdr->frame_control))
4424                         return false;
4425                 if (!is_broadcast_ether_addr(bssid))
4426                         return false;
4427                 if (!multicast &&
4428                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4429                         return false;
4430                 if (!rx->sta) {
4431                         int rate_idx;
4432                         if (status->encoding != RX_ENC_LEGACY)
4433                                 rate_idx = 0; /* TODO: HT rates */
4434                         else
4435                                 rate_idx = status->rate_idx;
4436                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4437                                                 BIT(rate_idx));
4438                 }
4439                 return true;
4440         case NL80211_IFTYPE_MESH_POINT:
4441                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4442                         return false;
4443                 if (multicast)
4444                         return true;
4445                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4446         case NL80211_IFTYPE_AP_VLAN:
4447         case NL80211_IFTYPE_AP:
4448                 if (!bssid)
4449                         return ieee80211_is_our_addr(sdata, hdr->addr1,
4450                                                      &rx->link_id);
4451
4452                 if (!is_broadcast_ether_addr(bssid) &&
4453                     !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4454                         /*
4455                          * Accept public action frames even when the
4456                          * BSSID doesn't match, this is used for P2P
4457                          * and location updates. Note that mac80211
4458                          * itself never looks at these frames.
4459                          */
4460                         if (!multicast &&
4461                             !ieee80211_is_our_addr(sdata, hdr->addr1,
4462                                                    &rx->link_id))
4463                                 return false;
4464                         if (ieee80211_is_public_action(hdr, skb->len))
4465                                 return true;
4466                         return ieee80211_is_beacon(hdr->frame_control);
4467                 }
4468
4469                 if (!ieee80211_has_tods(hdr->frame_control)) {
4470                         /* ignore data frames to TDLS-peers */
4471                         if (ieee80211_is_data(hdr->frame_control))
4472                                 return false;
4473                         /* ignore action frames to TDLS-peers */
4474                         if (ieee80211_is_action(hdr->frame_control) &&
4475                             !is_broadcast_ether_addr(bssid) &&
4476                             !ether_addr_equal(bssid, hdr->addr1))
4477                                 return false;
4478                 }
4479
4480                 /*
4481                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4482                  * the BSSID - we've checked that already but may have accepted
4483                  * the wildcard (ff:ff:ff:ff:ff:ff).
4484                  *
4485                  * It also says:
4486                  *      The BSSID of the Data frame is determined as follows:
4487                  *      a) If the STA is contained within an AP or is associated
4488                  *         with an AP, the BSSID is the address currently in use
4489                  *         by the STA contained in the AP.
4490                  *
4491                  * So we should not accept data frames with an address that's
4492                  * multicast.
4493                  *
4494                  * Accepting it also opens a security problem because stations
4495                  * could encrypt it with the GTK and inject traffic that way.
4496                  */
4497                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4498                         return false;
4499
4500                 return true;
4501         case NL80211_IFTYPE_P2P_DEVICE:
4502                 return ieee80211_is_public_action(hdr, skb->len) ||
4503                        ieee80211_is_probe_req(hdr->frame_control) ||
4504                        ieee80211_is_probe_resp(hdr->frame_control) ||
4505                        ieee80211_is_beacon(hdr->frame_control);
4506         case NL80211_IFTYPE_NAN:
4507                 /* Currently no frames on NAN interface are allowed */
4508                 return false;
4509         default:
4510                 break;
4511         }
4512
4513         WARN_ON_ONCE(1);
4514         return false;
4515 }
4516
4517 void ieee80211_check_fast_rx(struct sta_info *sta)
4518 {
4519         struct ieee80211_sub_if_data *sdata = sta->sdata;
4520         struct ieee80211_local *local = sdata->local;
4521         struct ieee80211_key *key;
4522         struct ieee80211_fast_rx fastrx = {
4523                 .dev = sdata->dev,
4524                 .vif_type = sdata->vif.type,
4525                 .control_port_protocol = sdata->control_port_protocol,
4526         }, *old, *new = NULL;
4527         u32 offload_flags;
4528         bool set_offload = false;
4529         bool assign = false;
4530         bool offload;
4531
4532         /* use sparse to check that we don't return without updating */
4533         __acquire(check_fast_rx);
4534
4535         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4536         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4537         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4538         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4539
4540         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4541
4542         /* fast-rx doesn't do reordering */
4543         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4544             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4545                 goto clear;
4546
4547         switch (sdata->vif.type) {
4548         case NL80211_IFTYPE_STATION:
4549                 if (sta->sta.tdls) {
4550                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4551                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4552                         fastrx.expected_ds_bits = 0;
4553                 } else {
4554                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4555                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4556                         fastrx.expected_ds_bits =
4557                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4558                 }
4559
4560                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4561                         fastrx.expected_ds_bits |=
4562                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4563                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4564                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4565                 }
4566
4567                 if (!sdata->u.mgd.powersave)
4568                         break;
4569
4570                 /* software powersave is a huge mess, avoid all of it */
4571                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4572                         goto clear;
4573                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4574                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4575                         goto clear;
4576                 break;
4577         case NL80211_IFTYPE_AP_VLAN:
4578         case NL80211_IFTYPE_AP:
4579                 /* parallel-rx requires this, at least with calls to
4580                  * ieee80211_sta_ps_transition()
4581                  */
4582                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4583                         goto clear;
4584                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4585                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4586                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4587
4588                 fastrx.internal_forward =
4589                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4590                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4591                          !sdata->u.vlan.sta);
4592
4593                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4594                     sdata->u.vlan.sta) {
4595                         fastrx.expected_ds_bits |=
4596                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4597                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4598                         fastrx.internal_forward = 0;
4599                 }
4600
4601                 break;
4602         case NL80211_IFTYPE_MESH_POINT:
4603                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
4604                                                       IEEE80211_FCTL_TODS);
4605                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4606                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4607                 break;
4608         default:
4609                 goto clear;
4610         }
4611
4612         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4613                 goto clear;
4614
4615         rcu_read_lock();
4616         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4617         if (!key)
4618                 key = rcu_dereference(sdata->default_unicast_key);
4619         if (key) {
4620                 switch (key->conf.cipher) {
4621                 case WLAN_CIPHER_SUITE_TKIP:
4622                         /* we don't want to deal with MMIC in fast-rx */
4623                         goto clear_rcu;
4624                 case WLAN_CIPHER_SUITE_CCMP:
4625                 case WLAN_CIPHER_SUITE_CCMP_256:
4626                 case WLAN_CIPHER_SUITE_GCMP:
4627                 case WLAN_CIPHER_SUITE_GCMP_256:
4628                         break;
4629                 default:
4630                         /* We also don't want to deal with
4631                          * WEP or cipher scheme.
4632                          */
4633                         goto clear_rcu;
4634                 }
4635
4636                 fastrx.key = true;
4637                 fastrx.icv_len = key->conf.icv_len;
4638         }
4639
4640         assign = true;
4641  clear_rcu:
4642         rcu_read_unlock();
4643  clear:
4644         __release(check_fast_rx);
4645
4646         if (assign)
4647                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4648
4649         offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4650         offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4651
4652         if (assign && offload)
4653                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4654         else
4655                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4656
4657         if (set_offload)
4658                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4659
4660         spin_lock_bh(&sta->lock);
4661         old = rcu_dereference_protected(sta->fast_rx, true);
4662         rcu_assign_pointer(sta->fast_rx, new);
4663         spin_unlock_bh(&sta->lock);
4664
4665         if (old)
4666                 kfree_rcu(old, rcu_head);
4667 }
4668
4669 void ieee80211_clear_fast_rx(struct sta_info *sta)
4670 {
4671         struct ieee80211_fast_rx *old;
4672
4673         spin_lock_bh(&sta->lock);
4674         old = rcu_dereference_protected(sta->fast_rx, true);
4675         RCU_INIT_POINTER(sta->fast_rx, NULL);
4676         spin_unlock_bh(&sta->lock);
4677
4678         if (old)
4679                 kfree_rcu(old, rcu_head);
4680 }
4681
4682 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4683 {
4684         struct ieee80211_local *local = sdata->local;
4685         struct sta_info *sta;
4686
4687         lockdep_assert_wiphy(local->hw.wiphy);
4688
4689         list_for_each_entry(sta, &local->sta_list, list) {
4690                 if (sdata != sta->sdata &&
4691                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4692                         continue;
4693                 ieee80211_check_fast_rx(sta);
4694         }
4695 }
4696
4697 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4698 {
4699         struct ieee80211_local *local = sdata->local;
4700
4701         lockdep_assert_wiphy(local->hw.wiphy);
4702
4703         __ieee80211_check_fast_rx_iface(sdata);
4704 }
4705
4706 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4707                               struct ieee80211_fast_rx *fast_rx,
4708                               int orig_len)
4709 {
4710         struct ieee80211_sta_rx_stats *stats;
4711         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4712         struct sta_info *sta = rx->sta;
4713         struct link_sta_info *link_sta;
4714         struct sk_buff *skb = rx->skb;
4715         void *sa = skb->data + ETH_ALEN;
4716         void *da = skb->data;
4717
4718         if (rx->link_id >= 0) {
4719                 link_sta = rcu_dereference(sta->link[rx->link_id]);
4720                 if (WARN_ON_ONCE(!link_sta)) {
4721                         dev_kfree_skb(rx->skb);
4722                         return;
4723                 }
4724         } else {
4725                 link_sta = &sta->deflink;
4726         }
4727
4728         stats = &link_sta->rx_stats;
4729         if (fast_rx->uses_rss)
4730                 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4731
4732         /* statistics part of ieee80211_rx_h_sta_process() */
4733         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4734                 stats->last_signal = status->signal;
4735                 if (!fast_rx->uses_rss)
4736                         ewma_signal_add(&link_sta->rx_stats_avg.signal,
4737                                         -status->signal);
4738         }
4739
4740         if (status->chains) {
4741                 int i;
4742
4743                 stats->chains = status->chains;
4744                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4745                         int signal = status->chain_signal[i];
4746
4747                         if (!(status->chains & BIT(i)))
4748                                 continue;
4749
4750                         stats->chain_signal_last[i] = signal;
4751                         if (!fast_rx->uses_rss)
4752                                 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4753                                                 -signal);
4754                 }
4755         }
4756         /* end of statistics */
4757
4758         stats->last_rx = jiffies;
4759         stats->last_rate = sta_stats_encode_rate(status);
4760
4761         stats->fragments++;
4762         stats->packets++;
4763
4764         skb->dev = fast_rx->dev;
4765
4766         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4767
4768         /* The seqno index has the same property as needed
4769          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4770          * for non-QoS-data frames. Here we know it's a data
4771          * frame, so count MSDUs.
4772          */
4773         u64_stats_update_begin(&stats->syncp);
4774         stats->msdu[rx->seqno_idx]++;
4775         stats->bytes += orig_len;
4776         u64_stats_update_end(&stats->syncp);
4777
4778         if (fast_rx->internal_forward) {
4779                 struct sk_buff *xmit_skb = NULL;
4780                 if (is_multicast_ether_addr(da)) {
4781                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4782                 } else if (!ether_addr_equal(da, sa) &&
4783                            sta_info_get(rx->sdata, da)) {
4784                         xmit_skb = skb;
4785                         skb = NULL;
4786                 }
4787
4788                 if (xmit_skb) {
4789                         /*
4790                          * Send to wireless media and increase priority by 256
4791                          * to keep the received priority instead of
4792                          * reclassifying the frame (see cfg80211_classify8021d).
4793                          */
4794                         xmit_skb->priority += 256;
4795                         xmit_skb->protocol = htons(ETH_P_802_3);
4796                         skb_reset_network_header(xmit_skb);
4797                         skb_reset_mac_header(xmit_skb);
4798                         dev_queue_xmit(xmit_skb);
4799                 }
4800
4801                 if (!skb)
4802                         return;
4803         }
4804
4805         /* deliver to local stack */
4806         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4807         ieee80211_deliver_skb_to_local_stack(skb, rx);
4808 }
4809
4810 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4811                                      struct ieee80211_fast_rx *fast_rx)
4812 {
4813         struct sk_buff *skb = rx->skb;
4814         struct ieee80211_hdr *hdr = (void *)skb->data;
4815         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4816         static ieee80211_rx_result res;
4817         int orig_len = skb->len;
4818         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4819         int snap_offs = hdrlen;
4820         struct {
4821                 u8 snap[sizeof(rfc1042_header)];
4822                 __be16 proto;
4823         } *payload __aligned(2);
4824         struct {
4825                 u8 da[ETH_ALEN];
4826                 u8 sa[ETH_ALEN];
4827         } addrs __aligned(2);
4828         struct ieee80211_sta_rx_stats *stats;
4829
4830         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4831          * to a common data structure; drivers can implement that per queue
4832          * but we don't have that information in mac80211
4833          */
4834         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4835                 return false;
4836
4837 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4838
4839         /* If using encryption, we also need to have:
4840          *  - PN_VALIDATED: similar, but the implementation is tricky
4841          *  - DECRYPTED: necessary for PN_VALIDATED
4842          */
4843         if (fast_rx->key &&
4844             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4845                 return false;
4846
4847         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4848                 return false;
4849
4850         if (unlikely(ieee80211_is_frag(hdr)))
4851                 return false;
4852
4853         /* Since our interface address cannot be multicast, this
4854          * implicitly also rejects multicast frames without the
4855          * explicit check.
4856          *
4857          * We shouldn't get any *data* frames not addressed to us
4858          * (AP mode will accept multicast *management* frames), but
4859          * punting here will make it go through the full checks in
4860          * ieee80211_accept_frame().
4861          */
4862         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4863                 return false;
4864
4865         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4866                                               IEEE80211_FCTL_TODS)) !=
4867             fast_rx->expected_ds_bits)
4868                 return false;
4869
4870         /* assign the key to drop unencrypted frames (later)
4871          * and strip the IV/MIC if necessary
4872          */
4873         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4874                 /* GCMP header length is the same */
4875                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4876         }
4877
4878         if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
4879             !(status->rx_flags & IEEE80211_RX_AMSDU)) {
4880                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4881                         return false;
4882
4883                 payload = (void *)(skb->data + snap_offs);
4884
4885                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4886                         return false;
4887
4888                 /* Don't handle these here since they require special code.
4889                  * Accept AARP and IPX even though they should come with a
4890                  * bridge-tunnel header - but if we get them this way then
4891                  * there's little point in discarding them.
4892                  */
4893                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4894                              payload->proto == fast_rx->control_port_protocol))
4895                         return false;
4896         }
4897
4898         /* after this point, don't punt to the slowpath! */
4899
4900         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4901             pskb_trim(skb, skb->len - fast_rx->icv_len))
4902                 goto drop;
4903
4904         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4905                 goto drop;
4906
4907         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4908                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4909                     RX_QUEUED)
4910                         goto drop;
4911
4912                 return true;
4913         }
4914
4915         /* do the header conversion - first grab the addresses */
4916         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4917         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4918         if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
4919             skb_pull(skb, snap_offs - 2);
4920             put_unaligned_be16(skb->len - 2, skb->data);
4921         } else {
4922             skb_postpull_rcsum(skb, skb->data + snap_offs,
4923                                sizeof(rfc1042_header) + 2);
4924
4925             /* remove the SNAP but leave the ethertype */
4926             skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4927         }
4928         /* push the addresses in front */
4929         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4930
4931         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
4932         switch (res) {
4933         case RX_QUEUED:
4934                 return true;
4935         case RX_CONTINUE:
4936                 break;
4937         default:
4938                 goto drop;
4939         }
4940
4941         ieee80211_rx_8023(rx, fast_rx, orig_len);
4942
4943         return true;
4944  drop:
4945         dev_kfree_skb(skb);
4946
4947         if (fast_rx->uses_rss)
4948                 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
4949         else
4950                 stats = &rx->link_sta->rx_stats;
4951
4952         stats->dropped++;
4953         return true;
4954 }
4955
4956 /*
4957  * This function returns whether or not the SKB
4958  * was destined for RX processing or not, which,
4959  * if consume is true, is equivalent to whether
4960  * or not the skb was consumed.
4961  */
4962 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4963                                             struct sk_buff *skb, bool consume)
4964 {
4965         struct ieee80211_local *local = rx->local;
4966         struct ieee80211_sub_if_data *sdata = rx->sdata;
4967         struct ieee80211_hdr *hdr = (void *)skb->data;
4968         struct link_sta_info *link_sta = rx->link_sta;
4969         struct ieee80211_link_data *link = rx->link;
4970
4971         rx->skb = skb;
4972
4973         /* See if we can do fast-rx; if we have to copy we already lost,
4974          * so punt in that case. We should never have to deliver a data
4975          * frame to multiple interfaces anyway.
4976          *
4977          * We skip the ieee80211_accept_frame() call and do the necessary
4978          * checking inside ieee80211_invoke_fast_rx().
4979          */
4980         if (consume && rx->sta) {
4981                 struct ieee80211_fast_rx *fast_rx;
4982
4983                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4984                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4985                         return true;
4986         }
4987
4988         if (!ieee80211_accept_frame(rx))
4989                 return false;
4990
4991         if (!consume) {
4992                 struct skb_shared_hwtstamps *shwt;
4993
4994                 rx->skb = skb_copy(skb, GFP_ATOMIC);
4995                 if (!rx->skb) {
4996                         if (net_ratelimit())
4997                                 wiphy_debug(local->hw.wiphy,
4998                                         "failed to copy skb for %s\n",
4999                                         sdata->name);
5000                         return true;
5001                 }
5002
5003                 /* skb_copy() does not copy the hw timestamps, so copy it
5004                  * explicitly
5005                  */
5006                 shwt = skb_hwtstamps(rx->skb);
5007                 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
5008
5009                 /* Update the hdr pointer to the new skb for translation below */
5010                 hdr = (struct ieee80211_hdr *)rx->skb->data;
5011         }
5012
5013         if (unlikely(rx->sta && rx->sta->sta.mlo) &&
5014             is_unicast_ether_addr(hdr->addr1) &&
5015             !ieee80211_is_probe_resp(hdr->frame_control) &&
5016             !ieee80211_is_beacon(hdr->frame_control)) {
5017                 /* translate to MLD addresses */
5018                 if (ether_addr_equal(link->conf->addr, hdr->addr1))
5019                         ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
5020                 if (ether_addr_equal(link_sta->addr, hdr->addr2))
5021                         ether_addr_copy(hdr->addr2, rx->sta->addr);
5022                 /* translate A3 only if it's the BSSID */
5023                 if (!ieee80211_has_tods(hdr->frame_control) &&
5024                     !ieee80211_has_fromds(hdr->frame_control)) {
5025                         if (ether_addr_equal(link_sta->addr, hdr->addr3))
5026                                 ether_addr_copy(hdr->addr3, rx->sta->addr);
5027                         else if (ether_addr_equal(link->conf->addr, hdr->addr3))
5028                                 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
5029                 }
5030                 /* not needed for A4 since it can only carry the SA */
5031         }
5032
5033         ieee80211_invoke_rx_handlers(rx);
5034         return true;
5035 }
5036
5037 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
5038                                        struct ieee80211_sta *pubsta,
5039                                        struct sk_buff *skb,
5040                                        struct list_head *list)
5041 {
5042         struct ieee80211_local *local = hw_to_local(hw);
5043         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5044         struct ieee80211_fast_rx *fast_rx;
5045         struct ieee80211_rx_data rx;
5046         struct sta_info *sta;
5047         int link_id = -1;
5048
5049         memset(&rx, 0, sizeof(rx));
5050         rx.skb = skb;
5051         rx.local = local;
5052         rx.list = list;
5053         rx.link_id = -1;
5054
5055         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5056
5057         /* drop frame if too short for header */
5058         if (skb->len < sizeof(struct ethhdr))
5059                 goto drop;
5060
5061         if (!pubsta)
5062                 goto drop;
5063
5064         if (status->link_valid)
5065                 link_id = status->link_id;
5066
5067         /*
5068          * TODO: Should the frame be dropped if the right link_id is not
5069          * available? Or may be it is fine in the current form to proceed with
5070          * the frame processing because with frame being in 802.3 format,
5071          * link_id is used only for stats purpose and updating the stats on
5072          * the deflink is fine?
5073          */
5074         sta = container_of(pubsta, struct sta_info, sta);
5075         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5076                 goto drop;
5077
5078         fast_rx = rcu_dereference(rx.sta->fast_rx);
5079         if (!fast_rx)
5080                 goto drop;
5081
5082         ieee80211_rx_8023(&rx, fast_rx, skb->len);
5083         return;
5084
5085 drop:
5086         dev_kfree_skb(skb);
5087 }
5088
5089 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
5090                                        struct sk_buff *skb, bool consume)
5091 {
5092         struct link_sta_info *link_sta;
5093         struct ieee80211_hdr *hdr = (void *)skb->data;
5094         struct sta_info *sta;
5095         int link_id = -1;
5096
5097         /*
5098          * Look up link station first, in case there's a
5099          * chance that they might have a link address that
5100          * is identical to the MLD address, that way we'll
5101          * have the link information if needed.
5102          */
5103         link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
5104         if (link_sta) {
5105                 sta = link_sta->sta;
5106                 link_id = link_sta->link_id;
5107         } else {
5108                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5109
5110                 sta = sta_info_get_bss(rx->sdata, hdr->addr2);
5111                 if (status->link_valid)
5112                         link_id = status->link_id;
5113         }
5114
5115         if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
5116                 return false;
5117
5118         return ieee80211_prepare_and_rx_handle(rx, skb, consume);
5119 }
5120
5121 /*
5122  * This is the actual Rx frames handler. as it belongs to Rx path it must
5123  * be called with rcu_read_lock protection.
5124  */
5125 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
5126                                          struct ieee80211_sta *pubsta,
5127                                          struct sk_buff *skb,
5128                                          struct list_head *list)
5129 {
5130         struct ieee80211_local *local = hw_to_local(hw);
5131         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5132         struct ieee80211_sub_if_data *sdata;
5133         struct ieee80211_hdr *hdr;
5134         __le16 fc;
5135         struct ieee80211_rx_data rx;
5136         struct ieee80211_sub_if_data *prev;
5137         struct rhlist_head *tmp;
5138         int err = 0;
5139
5140         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5141         memset(&rx, 0, sizeof(rx));
5142         rx.skb = skb;
5143         rx.local = local;
5144         rx.list = list;
5145         rx.link_id = -1;
5146
5147         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5148                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5149
5150         if (ieee80211_is_mgmt(fc)) {
5151                 /* drop frame if too short for header */
5152                 if (skb->len < ieee80211_hdrlen(fc))
5153                         err = -ENOBUFS;
5154                 else
5155                         err = skb_linearize(skb);
5156         } else {
5157                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5158         }
5159
5160         if (err) {
5161                 dev_kfree_skb(skb);
5162                 return;
5163         }
5164
5165         hdr = (struct ieee80211_hdr *)skb->data;
5166         ieee80211_parse_qos(&rx);
5167         ieee80211_verify_alignment(&rx);
5168
5169         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5170                      ieee80211_is_beacon(hdr->frame_control) ||
5171                      ieee80211_is_s1g_beacon(hdr->frame_control)))
5172                 ieee80211_scan_rx(local, skb);
5173
5174         if (ieee80211_is_data(fc)) {
5175                 struct sta_info *sta, *prev_sta;
5176                 int link_id = -1;
5177
5178                 if (status->link_valid)
5179                         link_id = status->link_id;
5180
5181                 if (pubsta) {
5182                         sta = container_of(pubsta, struct sta_info, sta);
5183                         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5184                                 goto out;
5185
5186                         /*
5187                          * In MLO connection, fetch the link_id using addr2
5188                          * when the driver does not pass link_id in status.
5189                          * When the address translation is already performed by
5190                          * driver/hw, the valid link_id must be passed in
5191                          * status.
5192                          */
5193
5194                         if (!status->link_valid && pubsta->mlo) {
5195                                 struct ieee80211_hdr *hdr = (void *)skb->data;
5196                                 struct link_sta_info *link_sta;
5197
5198                                 link_sta = link_sta_info_get_bss(rx.sdata,
5199                                                                  hdr->addr2);
5200                                 if (!link_sta)
5201                                         goto out;
5202
5203                                 ieee80211_rx_data_set_link(&rx, link_sta->link_id);
5204                         }
5205
5206                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5207                                 return;
5208                         goto out;
5209                 }
5210
5211                 prev_sta = NULL;
5212
5213                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5214                         if (!prev_sta) {
5215                                 prev_sta = sta;
5216                                 continue;
5217                         }
5218
5219                         rx.sdata = prev_sta->sdata;
5220                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5221                                 goto out;
5222
5223                         if (!status->link_valid && prev_sta->sta.mlo)
5224                                 continue;
5225
5226                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
5227
5228                         prev_sta = sta;
5229                 }
5230
5231                 if (prev_sta) {
5232                         rx.sdata = prev_sta->sdata;
5233                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5234                                 goto out;
5235
5236                         if (!status->link_valid && prev_sta->sta.mlo)
5237                                 goto out;
5238
5239                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5240                                 return;
5241                         goto out;
5242                 }
5243         }
5244
5245         prev = NULL;
5246
5247         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5248                 if (!ieee80211_sdata_running(sdata))
5249                         continue;
5250
5251                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5252                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5253                         continue;
5254
5255                 /*
5256                  * frame is destined for this interface, but if it's
5257                  * not also for the previous one we handle that after
5258                  * the loop to avoid copying the SKB once too much
5259                  */
5260
5261                 if (!prev) {
5262                         prev = sdata;
5263                         continue;
5264                 }
5265
5266                 rx.sdata = prev;
5267                 ieee80211_rx_for_interface(&rx, skb, false);
5268
5269                 prev = sdata;
5270         }
5271
5272         if (prev) {
5273                 rx.sdata = prev;
5274
5275                 if (ieee80211_rx_for_interface(&rx, skb, true))
5276                         return;
5277         }
5278
5279  out:
5280         dev_kfree_skb(skb);
5281 }
5282
5283 /*
5284  * This is the receive path handler. It is called by a low level driver when an
5285  * 802.11 MPDU is received from the hardware.
5286  */
5287 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5288                        struct sk_buff *skb, struct list_head *list)
5289 {
5290         struct ieee80211_local *local = hw_to_local(hw);
5291         struct ieee80211_rate *rate = NULL;
5292         struct ieee80211_supported_band *sband;
5293         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5294         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5295
5296         WARN_ON_ONCE(softirq_count() == 0);
5297
5298         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5299                 goto drop;
5300
5301         sband = local->hw.wiphy->bands[status->band];
5302         if (WARN_ON(!sband))
5303                 goto drop;
5304
5305         /*
5306          * If we're suspending, it is possible although not too likely
5307          * that we'd be receiving frames after having already partially
5308          * quiesced the stack. We can't process such frames then since
5309          * that might, for example, cause stations to be added or other
5310          * driver callbacks be invoked.
5311          */
5312         if (unlikely(local->quiescing || local->suspended))
5313                 goto drop;
5314
5315         /* We might be during a HW reconfig, prevent Rx for the same reason */
5316         if (unlikely(local->in_reconfig))
5317                 goto drop;
5318
5319         /*
5320          * The same happens when we're not even started,
5321          * but that's worth a warning.
5322          */
5323         if (WARN_ON(!local->started))
5324                 goto drop;
5325
5326         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5327                 /*
5328                  * Validate the rate, unless a PLCP error means that
5329                  * we probably can't have a valid rate here anyway.
5330                  */
5331
5332                 switch (status->encoding) {
5333                 case RX_ENC_HT:
5334                         /*
5335                          * rate_idx is MCS index, which can be [0-76]
5336                          * as documented on:
5337                          *
5338                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5339                          *
5340                          * Anything else would be some sort of driver or
5341                          * hardware error. The driver should catch hardware
5342                          * errors.
5343                          */
5344                         if (WARN(status->rate_idx > 76,
5345                                  "Rate marked as an HT rate but passed "
5346                                  "status->rate_idx is not "
5347                                  "an MCS index [0-76]: %d (0x%02x)\n",
5348                                  status->rate_idx,
5349                                  status->rate_idx))
5350                                 goto drop;
5351                         break;
5352                 case RX_ENC_VHT:
5353                         if (WARN_ONCE(status->rate_idx > 11 ||
5354                                       !status->nss ||
5355                                       status->nss > 8,
5356                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5357                                       status->rate_idx, status->nss))
5358                                 goto drop;
5359                         break;
5360                 case RX_ENC_HE:
5361                         if (WARN_ONCE(status->rate_idx > 11 ||
5362                                       !status->nss ||
5363                                       status->nss > 8,
5364                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5365                                       status->rate_idx, status->nss))
5366                                 goto drop;
5367                         break;
5368                 case RX_ENC_EHT:
5369                         if (WARN_ONCE(status->rate_idx > 15 ||
5370                                       !status->nss ||
5371                                       status->nss > 8 ||
5372                                       status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
5373                                       "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
5374                                       status->rate_idx, status->nss, status->eht.gi))
5375                                 goto drop;
5376                         break;
5377                 default:
5378                         WARN_ON_ONCE(1);
5379                         fallthrough;
5380                 case RX_ENC_LEGACY:
5381                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5382                                 goto drop;
5383                         rate = &sband->bitrates[status->rate_idx];
5384                 }
5385         }
5386
5387         if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5388                 goto drop;
5389
5390         status->rx_flags = 0;
5391
5392         kcov_remote_start_common(skb_get_kcov_handle(skb));
5393
5394         /*
5395          * Frames with failed FCS/PLCP checksum are not returned,
5396          * all other frames are returned without radiotap header
5397          * if it was previously present.
5398          * Also, frames with less than 16 bytes are dropped.
5399          */
5400         if (!(status->flag & RX_FLAG_8023))
5401                 skb = ieee80211_rx_monitor(local, skb, rate);
5402         if (skb) {
5403                 if ((status->flag & RX_FLAG_8023) ||
5404                         ieee80211_is_data_present(hdr->frame_control))
5405                         ieee80211_tpt_led_trig_rx(local, skb->len);
5406
5407                 if (status->flag & RX_FLAG_8023)
5408                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5409                 else
5410                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5411         }
5412
5413         kcov_remote_stop();
5414         return;
5415  drop:
5416         kfree_skb(skb);
5417 }
5418 EXPORT_SYMBOL(ieee80211_rx_list);
5419
5420 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5421                        struct sk_buff *skb, struct napi_struct *napi)
5422 {
5423         struct sk_buff *tmp;
5424         LIST_HEAD(list);
5425
5426
5427         /*
5428          * key references and virtual interfaces are protected using RCU
5429          * and this requires that we are in a read-side RCU section during
5430          * receive processing
5431          */
5432         rcu_read_lock();
5433         ieee80211_rx_list(hw, pubsta, skb, &list);
5434         rcu_read_unlock();
5435
5436         if (!napi) {
5437                 netif_receive_skb_list(&list);
5438                 return;
5439         }
5440
5441         list_for_each_entry_safe(skb, tmp, &list, list) {
5442                 skb_list_del_init(skb);
5443                 napi_gro_receive(napi, skb);
5444         }
5445 }
5446 EXPORT_SYMBOL(ieee80211_rx_napi);
5447
5448 /* This is a version of the rx handler that can be called from hard irq
5449  * context. Post the skb on the queue and schedule the tasklet */
5450 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5451 {
5452         struct ieee80211_local *local = hw_to_local(hw);
5453
5454         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5455
5456         skb->pkt_type = IEEE80211_RX_MSG;
5457         skb_queue_tail(&local->skb_queue, skb);
5458         tasklet_schedule(&local->tasklet);
5459 }
5460 EXPORT_SYMBOL(ieee80211_rx_irqsafe);