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 <[email protected]>
   6  * Copyright 2007-2010  Johannes Berg <[email protected]>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
   9  * Copyright (C) 2018-2024 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 mpdu_seq_num = ieee80211_get_sn(hdr);
1255         u16 head_seq_num, buf_size;
1256         int index;
1257         bool ret = true;
1258
1259         spin_lock(&tid_agg_rx->reorder_lock);
1260
1261         /*
1262          * Offloaded BA sessions have no known starting sequence number so pick
1263          * one from first Rxed frame for this tid after BA was started.
1264          */
1265         if (unlikely(tid_agg_rx->auto_seq)) {
1266                 tid_agg_rx->auto_seq = false;
1267                 tid_agg_rx->ssn = mpdu_seq_num;
1268                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1269         }
1270
1271         buf_size = tid_agg_rx->buf_size;
1272         head_seq_num = tid_agg_rx->head_seq_num;
1273
1274         /*
1275          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1276          * be reordered.
1277          */
1278         if (unlikely(!tid_agg_rx->started)) {
1279                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1280                         ret = false;
1281                         goto out;
1282                 }
1283                 tid_agg_rx->started = true;
1284         }
1285
1286         /* frame with out of date sequence number */
1287         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1288                 dev_kfree_skb(skb);
1289                 goto out;
1290         }
1291
1292         /*
1293          * If frame the sequence number exceeds our buffering window
1294          * size release some previous frames to make room for this one.
1295          */
1296         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1297                 head_seq_num = ieee80211_sn_inc(
1298                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1299                 /* release stored frames up to new head to stack */
1300                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1301                                                  head_seq_num, frames);
1302         }
1303
1304         /* Now the new frame is always in the range of the reordering buffer */
1305
1306         index = mpdu_seq_num % tid_agg_rx->buf_size;
1307
1308         /* check if we already stored this frame */
1309         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1310                 dev_kfree_skb(skb);
1311                 goto out;
1312         }
1313
1314         /*
1315          * If the current MPDU is in the right order and nothing else
1316          * is stored we can process it directly, no need to buffer it.
1317          * If it is first but there's something stored, we may be able
1318          * to release frames after this one.
1319          */
1320         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1321             tid_agg_rx->stored_mpdu_num == 0) {
1322                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1323                         tid_agg_rx->head_seq_num =
1324                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1325                 ret = false;
1326                 goto out;
1327         }
1328
1329         /* put the frame in the reordering buffer */
1330         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1331         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1332                 tid_agg_rx->reorder_time[index] = jiffies;
1333                 tid_agg_rx->stored_mpdu_num++;
1334                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1335         }
1336
1337  out:
1338         spin_unlock(&tid_agg_rx->reorder_lock);
1339         return ret;
1340 }
1341
1342 /*
1343  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1344  * true if the MPDU was buffered, false if it should be processed.
1345  */
1346 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1347                                        struct sk_buff_head *frames)
1348 {
1349         struct sk_buff *skb = rx->skb;
1350         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1351         struct sta_info *sta = rx->sta;
1352         struct tid_ampdu_rx *tid_agg_rx;
1353         u16 sc;
1354         u8 tid, ack_policy;
1355
1356         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1357             is_multicast_ether_addr(hdr->addr1))
1358                 goto dont_reorder;
1359
1360         /*
1361          * filter the QoS data rx stream according to
1362          * STA/TID and check if this STA/TID is on aggregation
1363          */
1364
1365         if (!sta)
1366                 goto dont_reorder;
1367
1368         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1369                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1370         tid = ieee80211_get_tid(hdr);
1371
1372         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1373         if (!tid_agg_rx) {
1374                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1375                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1376                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1377                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1378                                              WLAN_BACK_RECIPIENT,
1379                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1380                 goto dont_reorder;
1381         }
1382
1383         /* qos null data frames are excluded */
1384         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1385                 goto dont_reorder;
1386
1387         /* not part of a BA session */
1388         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1389                 goto dont_reorder;
1390
1391         /* new, potentially un-ordered, ampdu frame - process it */
1392
1393         /* reset session timer */
1394         if (tid_agg_rx->timeout)
1395                 tid_agg_rx->last_rx = jiffies;
1396
1397         /* if this mpdu is fragmented - terminate rx aggregation session */
1398         sc = le16_to_cpu(hdr->seq_ctrl);
1399         if (sc & IEEE80211_SCTL_FRAG) {
1400                 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1401                 return;
1402         }
1403
1404         /*
1405          * No locking needed -- we will only ever process one
1406          * RX packet at a time, and thus own tid_agg_rx. All
1407          * other code manipulating it needs to (and does) make
1408          * sure that we cannot get to it any more before doing
1409          * anything with it.
1410          */
1411         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1412                                              frames))
1413                 return;
1414
1415  dont_reorder:
1416         __skb_queue_tail(frames, skb);
1417 }
1418
1419 static ieee80211_rx_result debug_noinline
1420 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1421 {
1422         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1423         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1424
1425         if (status->flag & RX_FLAG_DUP_VALIDATED)
1426                 return RX_CONTINUE;
1427
1428         /*
1429          * Drop duplicate 802.11 retransmissions
1430          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1431          */
1432
1433         if (rx->skb->len < 24)
1434                 return RX_CONTINUE;
1435
1436         if (ieee80211_is_ctl(hdr->frame_control) ||
1437             ieee80211_is_any_nullfunc(hdr->frame_control))
1438                 return RX_CONTINUE;
1439
1440         if (!rx->sta)
1441                 return RX_CONTINUE;
1442
1443         if (unlikely(is_multicast_ether_addr(hdr->addr1))) {
1444                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1445                 u16 sn = ieee80211_get_sn(hdr);
1446
1447                 if (!ieee80211_is_data_present(hdr->frame_control))
1448                         return RX_CONTINUE;
1449
1450                 if (!ieee80211_vif_is_mld(&sdata->vif) ||
1451                     sdata->vif.type != NL80211_IFTYPE_STATION)
1452                         return RX_CONTINUE;
1453
1454                 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO &&
1455                     ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last))
1456                         return RX_DROP_U_DUP;
1457
1458                 sdata->u.mgd.mcast_seq_last = sn;
1459                 return RX_CONTINUE;
1460         }
1461
1462         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1463                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1464                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1465                 rx->link_sta->rx_stats.num_duplicates++;
1466                 return RX_DROP_U_DUP;
1467         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1468                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1469         }
1470
1471         return RX_CONTINUE;
1472 }
1473
1474 static ieee80211_rx_result debug_noinline
1475 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1476 {
1477         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1478
1479         /* Drop disallowed frame classes based on STA auth/assoc state;
1480          * IEEE 802.11, Chap 5.5.
1481          *
1482          * mac80211 filters only based on association state, i.e. it drops
1483          * Class 3 frames from not associated stations. hostapd sends
1484          * deauth/disassoc frames when needed. In addition, hostapd is
1485          * responsible for filtering on both auth and assoc states.
1486          */
1487
1488         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1489                 return ieee80211_rx_mesh_check(rx);
1490
1491         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1492                       ieee80211_is_pspoll(hdr->frame_control)) &&
1493                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1494                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1495                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1496                 /*
1497                  * accept port control frames from the AP even when it's not
1498                  * yet marked ASSOC to prevent a race where we don't set the
1499                  * assoc bit quickly enough before it sends the first frame
1500                  */
1501                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1502                     ieee80211_is_data_present(hdr->frame_control)) {
1503                         unsigned int hdrlen;
1504                         __be16 ethertype;
1505
1506                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1507
1508                         if (rx->skb->len < hdrlen + 8)
1509                                 return RX_DROP_MONITOR;
1510
1511                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1512                         if (ethertype == rx->sdata->control_port_protocol)
1513                                 return RX_CONTINUE;
1514                 }
1515
1516                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1517                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1518                                                hdr->addr2,
1519                                                GFP_ATOMIC))
1520                         return RX_DROP_U_SPURIOUS;
1521
1522                 return RX_DROP_MONITOR;
1523         }
1524
1525         return RX_CONTINUE;
1526 }
1527
1528
1529 static ieee80211_rx_result debug_noinline
1530 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1531 {
1532         struct ieee80211_local *local;
1533         struct ieee80211_hdr *hdr;
1534         struct sk_buff *skb;
1535
1536         local = rx->local;
1537         skb = rx->skb;
1538         hdr = (struct ieee80211_hdr *) skb->data;
1539
1540         if (!local->pspolling)
1541                 return RX_CONTINUE;
1542
1543         if (!ieee80211_has_fromds(hdr->frame_control))
1544                 /* this is not from AP */
1545                 return RX_CONTINUE;
1546
1547         if (!ieee80211_is_data(hdr->frame_control))
1548                 return RX_CONTINUE;
1549
1550         if (!ieee80211_has_moredata(hdr->frame_control)) {
1551                 /* AP has no more frames buffered for us */
1552                 local->pspolling = false;
1553                 return RX_CONTINUE;
1554         }
1555
1556         /* more data bit is set, let's request a new frame from the AP */
1557         ieee80211_send_pspoll(local, rx->sdata);
1558
1559         return RX_CONTINUE;
1560 }
1561
1562 static void sta_ps_start(struct sta_info *sta)
1563 {
1564         struct ieee80211_sub_if_data *sdata = sta->sdata;
1565         struct ieee80211_local *local = sdata->local;
1566         struct ps_data *ps;
1567         int tid;
1568
1569         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1570             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1571                 ps = &sdata->bss->ps;
1572         else
1573                 return;
1574
1575         atomic_inc(&ps->num_sta_ps);
1576         set_sta_flag(sta, WLAN_STA_PS_STA);
1577         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1578                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1579         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1580                sta->sta.addr, sta->sta.aid);
1581
1582         ieee80211_clear_fast_xmit(sta);
1583
1584         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1585                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1586                 struct txq_info *txqi = to_txq_info(txq);
1587
1588                 spin_lock(&local->active_txq_lock[txq->ac]);
1589                 if (!list_empty(&txqi->schedule_order))
1590                         list_del_init(&txqi->schedule_order);
1591                 spin_unlock(&local->active_txq_lock[txq->ac]);
1592
1593                 if (txq_has_queue(txq))
1594                         set_bit(tid, &sta->txq_buffered_tids);
1595                 else
1596                         clear_bit(tid, &sta->txq_buffered_tids);
1597         }
1598 }
1599
1600 static void sta_ps_end(struct sta_info *sta)
1601 {
1602         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1603                sta->sta.addr, sta->sta.aid);
1604
1605         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1606                 /*
1607                  * Clear the flag only if the other one is still set
1608                  * so that the TX path won't start TX'ing new frames
1609                  * directly ... In the case that the driver flag isn't
1610                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1611                  */
1612                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1613                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1614                        sta->sta.addr, sta->sta.aid);
1615                 return;
1616         }
1617
1618         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1619         clear_sta_flag(sta, WLAN_STA_PS_STA);
1620         ieee80211_sta_ps_deliver_wakeup(sta);
1621 }
1622
1623 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1624 {
1625         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1626         bool in_ps;
1627
1628         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1629
1630         /* Don't let the same PS state be set twice */
1631         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1632         if ((start && in_ps) || (!start && !in_ps))
1633                 return -EINVAL;
1634
1635         if (start)
1636                 sta_ps_start(sta);
1637         else
1638                 sta_ps_end(sta);
1639
1640         return 0;
1641 }
1642 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1643
1644 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1645 {
1646         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1647
1648         if (test_sta_flag(sta, WLAN_STA_SP))
1649                 return;
1650
1651         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1652                 ieee80211_sta_ps_deliver_poll_response(sta);
1653         else
1654                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1655 }
1656 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1657
1658 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1659 {
1660         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1661         int ac = ieee80211_ac_from_tid(tid);
1662
1663         /*
1664          * If this AC is not trigger-enabled do nothing unless the
1665          * driver is calling us after it already checked.
1666          *
1667          * NB: This could/should check a separate bitmap of trigger-
1668          * enabled queues, but for now we only implement uAPSD w/o
1669          * TSPEC changes to the ACs, so they're always the same.
1670          */
1671         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1672             tid != IEEE80211_NUM_TIDS)
1673                 return;
1674
1675         /* if we are in a service period, do nothing */
1676         if (test_sta_flag(sta, WLAN_STA_SP))
1677                 return;
1678
1679         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1680                 ieee80211_sta_ps_deliver_uapsd(sta);
1681         else
1682                 set_sta_flag(sta, WLAN_STA_UAPSD);
1683 }
1684 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1685
1686 static ieee80211_rx_result debug_noinline
1687 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1688 {
1689         struct ieee80211_sub_if_data *sdata = rx->sdata;
1690         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1691         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1692
1693         if (!rx->sta)
1694                 return RX_CONTINUE;
1695
1696         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1697             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1698                 return RX_CONTINUE;
1699
1700         /*
1701          * The device handles station powersave, so don't do anything about
1702          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1703          * it to mac80211 since they're handled.)
1704          */
1705         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1706                 return RX_CONTINUE;
1707
1708         /*
1709          * Don't do anything if the station isn't already asleep. In
1710          * the uAPSD case, the station will probably be marked asleep,
1711          * in the PS-Poll case the station must be confused ...
1712          */
1713         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1714                 return RX_CONTINUE;
1715
1716         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1717                 ieee80211_sta_pspoll(&rx->sta->sta);
1718
1719                 /* Free PS Poll skb here instead of returning RX_DROP that would
1720                  * count as an dropped frame. */
1721                 dev_kfree_skb(rx->skb);
1722
1723                 return RX_QUEUED;
1724         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1725                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1726                    ieee80211_has_pm(hdr->frame_control) &&
1727                    (ieee80211_is_data_qos(hdr->frame_control) ||
1728                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1729                 u8 tid = ieee80211_get_tid(hdr);
1730
1731                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1732         }
1733
1734         return RX_CONTINUE;
1735 }
1736
1737 static ieee80211_rx_result debug_noinline
1738 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1739 {
1740         struct sta_info *sta = rx->sta;
1741         struct link_sta_info *link_sta = rx->link_sta;
1742         struct sk_buff *skb = rx->skb;
1743         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1744         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1745         int i;
1746
1747         if (!sta || !link_sta)
1748                 return RX_CONTINUE;
1749
1750         /*
1751          * Update last_rx only for IBSS packets which are for the current
1752          * BSSID and for station already AUTHORIZED to avoid keeping the
1753          * current IBSS network alive in cases where other STAs start
1754          * using different BSSID. This will also give the station another
1755          * chance to restart the authentication/authorization in case
1756          * something went wrong the first time.
1757          */
1758         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1759                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1760                                                 NL80211_IFTYPE_ADHOC);
1761                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1762                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1763                         link_sta->rx_stats.last_rx = jiffies;
1764                         if (ieee80211_is_data_present(hdr->frame_control) &&
1765                             !is_multicast_ether_addr(hdr->addr1))
1766                                 link_sta->rx_stats.last_rate =
1767                                         sta_stats_encode_rate(status);
1768                 }
1769         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1770                 link_sta->rx_stats.last_rx = jiffies;
1771         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1772                    !is_multicast_ether_addr(hdr->addr1)) {
1773                 /*
1774                  * Mesh beacons will update last_rx when if they are found to
1775                  * match the current local configuration when processed.
1776                  */
1777                 link_sta->rx_stats.last_rx = jiffies;
1778                 if (ieee80211_is_data_present(hdr->frame_control))
1779                         link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1780         }
1781
1782         link_sta->rx_stats.fragments++;
1783
1784         u64_stats_update_begin(&link_sta->rx_stats.syncp);
1785         link_sta->rx_stats.bytes += rx->skb->len;
1786         u64_stats_update_end(&link_sta->rx_stats.syncp);
1787
1788         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1789                 link_sta->rx_stats.last_signal = status->signal;
1790                 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1791                                 -status->signal);
1792         }
1793
1794         if (status->chains) {
1795                 link_sta->rx_stats.chains = status->chains;
1796                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1797                         int signal = status->chain_signal[i];
1798
1799                         if (!(status->chains & BIT(i)))
1800                                 continue;
1801
1802                         link_sta->rx_stats.chain_signal_last[i] = signal;
1803                         ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1804                                         -signal);
1805                 }
1806         }
1807
1808         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1809                 return RX_CONTINUE;
1810
1811         /*
1812          * Change STA power saving mode only at the end of a frame
1813          * exchange sequence, and only for a data or management
1814          * frame as specified in IEEE 802.11-2016 11.2.3.2
1815          */
1816         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1817             !ieee80211_has_morefrags(hdr->frame_control) &&
1818             !is_multicast_ether_addr(hdr->addr1) &&
1819             (ieee80211_is_mgmt(hdr->frame_control) ||
1820              ieee80211_is_data(hdr->frame_control)) &&
1821             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1822             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1823              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1824                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1825                         if (!ieee80211_has_pm(hdr->frame_control))
1826                                 sta_ps_end(sta);
1827                 } else {
1828                         if (ieee80211_has_pm(hdr->frame_control))
1829                                 sta_ps_start(sta);
1830                 }
1831         }
1832
1833         /* mesh power save support */
1834         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1835                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1836
1837         /*
1838          * Drop (qos-)data::nullfunc frames silently, since they
1839          * are used only to control station power saving mode.
1840          */
1841         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1842                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1843
1844                 /*
1845                  * If we receive a 4-addr nullfunc frame from a STA
1846                  * that was not moved to a 4-addr STA vlan yet send
1847                  * the event to userspace and for older hostapd drop
1848                  * the frame to the monitor interface.
1849                  */
1850                 if (ieee80211_has_a4(hdr->frame_control) &&
1851                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1852                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1853                       !rx->sdata->u.vlan.sta))) {
1854                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1855                                 cfg80211_rx_unexpected_4addr_frame(
1856                                         rx->sdata->dev, sta->sta.addr,
1857                                         GFP_ATOMIC);
1858                         return RX_DROP_M_UNEXPECTED_4ADDR_FRAME;
1859                 }
1860                 /*
1861                  * Update counter and free packet here to avoid
1862                  * counting this as a dropped packed.
1863                  */
1864                 link_sta->rx_stats.packets++;
1865                 dev_kfree_skb(rx->skb);
1866                 return RX_QUEUED;
1867         }
1868
1869         return RX_CONTINUE;
1870 } /* ieee80211_rx_h_sta_process */
1871
1872 static struct ieee80211_key *
1873 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1874 {
1875         struct ieee80211_key *key = NULL;
1876         int idx2;
1877
1878         /* Make sure key gets set if either BIGTK key index is set so that
1879          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1880          * Beacon frames and Beacon frames that claim to use another BIGTK key
1881          * index (i.e., a key that we do not have).
1882          */
1883
1884         if (idx < 0) {
1885                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1886                 idx2 = idx + 1;
1887         } else {
1888                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1889                         idx2 = idx + 1;
1890                 else
1891                         idx2 = idx - 1;
1892         }
1893
1894         if (rx->link_sta)
1895                 key = rcu_dereference(rx->link_sta->gtk[idx]);
1896         if (!key)
1897                 key = rcu_dereference(rx->link->gtk[idx]);
1898         if (!key && rx->link_sta)
1899                 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1900         if (!key)
1901                 key = rcu_dereference(rx->link->gtk[idx2]);
1902
1903         return key;
1904 }
1905
1906 static ieee80211_rx_result debug_noinline
1907 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1908 {
1909         struct sk_buff *skb = rx->skb;
1910         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1911         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1912         int keyidx;
1913         ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL;
1914         struct ieee80211_key *sta_ptk = NULL;
1915         struct ieee80211_key *ptk_idx = NULL;
1916         int mmie_keyidx = -1;
1917         __le16 fc;
1918
1919         if (ieee80211_is_ext(hdr->frame_control))
1920                 return RX_CONTINUE;
1921
1922         /*
1923          * Key selection 101
1924          *
1925          * There are five types of keys:
1926          *  - GTK (group keys)
1927          *  - IGTK (group keys for management frames)
1928          *  - BIGTK (group keys for Beacon frames)
1929          *  - PTK (pairwise keys)
1930          *  - STK (station-to-station pairwise keys)
1931          *
1932          * When selecting a key, we have to distinguish between multicast
1933          * (including broadcast) and unicast frames, the latter can only
1934          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1935          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1936          * then unicast frames can also use key indices like GTKs. Hence, if we
1937          * don't have a PTK/STK we check the key index for a WEP key.
1938          *
1939          * Note that in a regular BSS, multicast frames are sent by the
1940          * AP only, associated stations unicast the frame to the AP first
1941          * which then multicasts it on their behalf.
1942          *
1943          * There is also a slight problem in IBSS mode: GTKs are negotiated
1944          * with each station, that is something we don't currently handle.
1945          * The spec seems to expect that one negotiates the same key with
1946          * every station but there's no such requirement; VLANs could be
1947          * possible.
1948          */
1949
1950         /* start without a key */
1951         rx->key = NULL;
1952         fc = hdr->frame_control;
1953
1954         if (rx->sta) {
1955                 int keyid = rx->sta->ptk_idx;
1956                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1957
1958                 if (ieee80211_has_protected(fc) &&
1959                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1960                         keyid = ieee80211_get_keyid(rx->skb);
1961
1962                         if (unlikely(keyid < 0))
1963                                 return RX_DROP_U_NO_KEY_ID;
1964
1965                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1966                 }
1967         }
1968
1969         if (!ieee80211_has_protected(fc))
1970                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1971
1972         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1973                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1974                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1975                     (status->flag & RX_FLAG_IV_STRIPPED))
1976                         return RX_CONTINUE;
1977                 /* Skip decryption if the frame is not protected. */
1978                 if (!ieee80211_has_protected(fc))
1979                         return RX_CONTINUE;
1980         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1981                 /* Broadcast/multicast robust management frame / BIP */
1982                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1983                     (status->flag & RX_FLAG_IV_STRIPPED))
1984                         return RX_CONTINUE;
1985
1986                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1987                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1988                                    NUM_DEFAULT_BEACON_KEYS) {
1989                         if (rx->sdata->dev)
1990                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1991                                                              skb->data,
1992                                                              skb->len);
1993                         return RX_DROP_M_BAD_BCN_KEYIDX;
1994                 }
1995
1996                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1997                 if (!rx->key)
1998                         return RX_CONTINUE; /* Beacon protection not in use */
1999         } else if (mmie_keyidx >= 0) {
2000                 /* Broadcast/multicast robust management frame / BIP */
2001                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2002                     (status->flag & RX_FLAG_IV_STRIPPED))
2003                         return RX_CONTINUE;
2004
2005                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2006                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2007                         return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
2008                 if (rx->link_sta) {
2009                         if (ieee80211_is_group_privacy_action(skb) &&
2010                             test_sta_flag(rx->sta, WLAN_STA_MFP))
2011                                 return RX_DROP_MONITOR;
2012
2013                         rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
2014                 }
2015                 if (!rx->key)
2016                         rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
2017         } else if (!ieee80211_has_protected(fc)) {
2018                 /*
2019                  * The frame was not protected, so skip decryption. However, we
2020                  * need to set rx->key if there is a key that could have been
2021                  * used so that the frame may be dropped if encryption would
2022                  * have been expected.
2023                  */
2024                 struct ieee80211_key *key = NULL;
2025                 int i;
2026
2027                 if (ieee80211_is_beacon(fc)) {
2028                         key = ieee80211_rx_get_bigtk(rx, -1);
2029                 } else if (ieee80211_is_mgmt(fc) &&
2030                            is_multicast_ether_addr(hdr->addr1)) {
2031                         key = rcu_dereference(rx->link->default_mgmt_key);
2032                 } else {
2033                         if (rx->link_sta) {
2034                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2035                                         key = rcu_dereference(rx->link_sta->gtk[i]);
2036                                         if (key)
2037                                                 break;
2038                                 }
2039                         }
2040                         if (!key) {
2041                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2042                                         key = rcu_dereference(rx->link->gtk[i]);
2043                                         if (key)
2044                                                 break;
2045                                 }
2046                         }
2047                 }
2048                 if (key)
2049                         rx->key = key;
2050                 return RX_CONTINUE;
2051         } else {
2052                 /*
2053                  * The device doesn't give us the IV so we won't be
2054                  * able to look up the key. That's ok though, we
2055                  * don't need to decrypt the frame, we just won't
2056                  * be able to keep statistics accurate.
2057                  * Except for key threshold notifications, should
2058                  * we somehow allow the driver to tell us which key
2059                  * the hardware used if this flag is set?
2060                  */
2061                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2062                     (status->flag & RX_FLAG_IV_STRIPPED))
2063                         return RX_CONTINUE;
2064
2065                 keyidx = ieee80211_get_keyid(rx->skb);
2066
2067                 if (unlikely(keyidx < 0))
2068                         return RX_DROP_U_NO_KEY_ID;
2069
2070                 /* check per-station GTK first, if multicast packet */
2071                 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2072                         rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2073
2074                 /* if not found, try default key */
2075                 if (!rx->key) {
2076                         if (is_multicast_ether_addr(hdr->addr1))
2077                                 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2078                         if (!rx->key)
2079                                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2080
2081                         /*
2082                          * RSNA-protected unicast frames should always be
2083                          * sent with pairwise or station-to-station keys,
2084                          * but for WEP we allow using a key index as well.
2085                          */
2086                         if (rx->key &&
2087                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2088                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2089                             !is_multicast_ether_addr(hdr->addr1))
2090                                 rx->key = NULL;
2091                 }
2092         }
2093
2094         if (rx->key) {
2095                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2096                         return RX_DROP_MONITOR;
2097
2098                 /* TODO: add threshold stuff again */
2099         } else {
2100                 return RX_DROP_MONITOR;
2101         }
2102
2103         switch (rx->key->conf.cipher) {
2104         case WLAN_CIPHER_SUITE_WEP40:
2105         case WLAN_CIPHER_SUITE_WEP104:
2106                 result = ieee80211_crypto_wep_decrypt(rx);
2107                 break;
2108         case WLAN_CIPHER_SUITE_TKIP:
2109                 result = ieee80211_crypto_tkip_decrypt(rx);
2110                 break;
2111         case WLAN_CIPHER_SUITE_CCMP:
2112                 result = ieee80211_crypto_ccmp_decrypt(
2113                         rx, IEEE80211_CCMP_MIC_LEN);
2114                 break;
2115         case WLAN_CIPHER_SUITE_CCMP_256:
2116                 result = ieee80211_crypto_ccmp_decrypt(
2117                         rx, IEEE80211_CCMP_256_MIC_LEN);
2118                 break;
2119         case WLAN_CIPHER_SUITE_AES_CMAC:
2120                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2121                 break;
2122         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2123                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2124                 break;
2125         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2126         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2127                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2128                 break;
2129         case WLAN_CIPHER_SUITE_GCMP:
2130         case WLAN_CIPHER_SUITE_GCMP_256:
2131                 result = ieee80211_crypto_gcmp_decrypt(rx);
2132                 break;
2133         default:
2134                 result = RX_DROP_U_BAD_CIPHER;
2135         }
2136
2137         /* the hdr variable is invalid after the decrypt handlers */
2138
2139         /* either the frame has been decrypted or will be dropped */
2140         status->flag |= RX_FLAG_DECRYPTED;
2141
2142         if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
2143                      rx->sdata->dev))
2144                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2145                                              skb->data, skb->len);
2146
2147         return result;
2148 }
2149
2150 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2151 {
2152         int i;
2153
2154         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2155                 skb_queue_head_init(&cache->entries[i].skb_list);
2156 }
2157
2158 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2159 {
2160         int i;
2161
2162         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2163                 __skb_queue_purge(&cache->entries[i].skb_list);
2164 }
2165
2166 static inline struct ieee80211_fragment_entry *
2167 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2168                          unsigned int frag, unsigned int seq, int rx_queue,
2169                          struct sk_buff **skb)
2170 {
2171         struct ieee80211_fragment_entry *entry;
2172
2173         entry = &cache->entries[cache->next++];
2174         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2175                 cache->next = 0;
2176
2177         __skb_queue_purge(&entry->skb_list);
2178
2179         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2180         *skb = NULL;
2181         entry->first_frag_time = jiffies;
2182         entry->seq = seq;
2183         entry->rx_queue = rx_queue;
2184         entry->last_frag = frag;
2185         entry->check_sequential_pn = false;
2186         entry->extra_len = 0;
2187
2188         return entry;
2189 }
2190
2191 static inline struct ieee80211_fragment_entry *
2192 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2193                           unsigned int frag, unsigned int seq,
2194                           int rx_queue, struct ieee80211_hdr *hdr)
2195 {
2196         struct ieee80211_fragment_entry *entry;
2197         int i, idx;
2198
2199         idx = cache->next;
2200         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2201                 struct ieee80211_hdr *f_hdr;
2202                 struct sk_buff *f_skb;
2203
2204                 idx--;
2205                 if (idx < 0)
2206                         idx = IEEE80211_FRAGMENT_MAX - 1;
2207
2208                 entry = &cache->entries[idx];
2209                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2210                     entry->rx_queue != rx_queue ||
2211                     entry->last_frag + 1 != frag)
2212                         continue;
2213
2214                 f_skb = __skb_peek(&entry->skb_list);
2215                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2216
2217                 /*
2218                  * Check ftype and addresses are equal, else check next fragment
2219                  */
2220                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2221                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2222                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2223                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2224                         continue;
2225
2226                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2227                         __skb_queue_purge(&entry->skb_list);
2228                         continue;
2229                 }
2230                 return entry;
2231         }
2232
2233         return NULL;
2234 }
2235
2236 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2237 {
2238         return rx->key &&
2239                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2240                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2241                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2242                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2243                 ieee80211_has_protected(fc);
2244 }
2245
2246 static ieee80211_rx_result debug_noinline
2247 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2248 {
2249         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2250         struct ieee80211_hdr *hdr;
2251         u16 sc;
2252         __le16 fc;
2253         unsigned int frag, seq;
2254         struct ieee80211_fragment_entry *entry;
2255         struct sk_buff *skb;
2256         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2257
2258         hdr = (struct ieee80211_hdr *)rx->skb->data;
2259         fc = hdr->frame_control;
2260
2261         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2262                 return RX_CONTINUE;
2263
2264         sc = le16_to_cpu(hdr->seq_ctrl);
2265         frag = sc & IEEE80211_SCTL_FRAG;
2266
2267         if (rx->sta)
2268                 cache = &rx->sta->frags;
2269
2270         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2271                 goto out;
2272
2273         if (is_multicast_ether_addr(hdr->addr1))
2274                 return RX_DROP_MONITOR;
2275
2276         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2277
2278         if (skb_linearize(rx->skb))
2279                 return RX_DROP_U_OOM;
2280
2281         /*
2282          *  skb_linearize() might change the skb->data and
2283          *  previously cached variables (in this case, hdr) need to
2284          *  be refreshed with the new data.
2285          */
2286         hdr = (struct ieee80211_hdr *)rx->skb->data;
2287         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2288
2289         if (frag == 0) {
2290                 /* This is the first fragment of a new frame. */
2291                 entry = ieee80211_reassemble_add(cache, frag, seq,
2292                                                  rx->seqno_idx, &(rx->skb));
2293                 if (requires_sequential_pn(rx, fc)) {
2294                         int queue = rx->security_idx;
2295
2296                         /* Store CCMP/GCMP PN so that we can verify that the
2297                          * next fragment has a sequential PN value.
2298                          */
2299                         entry->check_sequential_pn = true;
2300                         entry->is_protected = true;
2301                         entry->key_color = rx->key->color;
2302                         memcpy(entry->last_pn,
2303                                rx->key->u.ccmp.rx_pn[queue],
2304                                IEEE80211_CCMP_PN_LEN);
2305                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2306                                               u.ccmp.rx_pn) !=
2307                                      offsetof(struct ieee80211_key,
2308                                               u.gcmp.rx_pn));
2309                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2310                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2311                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2312                                      IEEE80211_GCMP_PN_LEN);
2313                 } else if (rx->key &&
2314                            (ieee80211_has_protected(fc) ||
2315                             (status->flag & RX_FLAG_DECRYPTED))) {
2316                         entry->is_protected = true;
2317                         entry->key_color = rx->key->color;
2318                 }
2319                 return RX_QUEUED;
2320         }
2321
2322         /* This is a fragment for a frame that should already be pending in
2323          * fragment cache. Add this fragment to the end of the pending entry.
2324          */
2325         entry = ieee80211_reassemble_find(cache, frag, seq,
2326                                           rx->seqno_idx, hdr);
2327         if (!entry) {
2328                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2329                 return RX_DROP_MONITOR;
2330         }
2331
2332         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2333          *  MPDU PN values are not incrementing in steps of 1."
2334          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2335          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2336          */
2337         if (entry->check_sequential_pn) {
2338                 int i;
2339                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2340
2341                 if (!requires_sequential_pn(rx, fc))
2342                         return RX_DROP_U_NONSEQ_PN;
2343
2344                 /* Prevent mixed key and fragment cache attacks */
2345                 if (entry->key_color != rx->key->color)
2346                         return RX_DROP_U_BAD_KEY_COLOR;
2347
2348                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2349                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2350                         pn[i]++;
2351                         if (pn[i])
2352                                 break;
2353                 }
2354
2355                 rpn = rx->ccm_gcm.pn;
2356                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2357                         return RX_DROP_U_REPLAY;
2358                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2359         } else if (entry->is_protected &&
2360                    (!rx->key ||
2361                     (!ieee80211_has_protected(fc) &&
2362                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2363                     rx->key->color != entry->key_color)) {
2364                 /* Drop this as a mixed key or fragment cache attack, even
2365                  * if for TKIP Michael MIC should protect us, and WEP is a
2366                  * lost cause anyway.
2367                  */
2368                 return RX_DROP_U_EXPECT_DEFRAG_PROT;
2369         } else if (entry->is_protected && rx->key &&
2370                    entry->key_color != rx->key->color &&
2371                    (status->flag & RX_FLAG_DECRYPTED)) {
2372                 return RX_DROP_U_BAD_KEY_COLOR;
2373         }
2374
2375         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2376         __skb_queue_tail(&entry->skb_list, rx->skb);
2377         entry->last_frag = frag;
2378         entry->extra_len += rx->skb->len;
2379         if (ieee80211_has_morefrags(fc)) {
2380                 rx->skb = NULL;
2381                 return RX_QUEUED;
2382         }
2383
2384         rx->skb = __skb_dequeue(&entry->skb_list);
2385         if (skb_tailroom(rx->skb) < entry->extra_len) {
2386                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2387                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2388                                               GFP_ATOMIC))) {
2389                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2390                         __skb_queue_purge(&entry->skb_list);
2391                         return RX_DROP_U_OOM;
2392                 }
2393         }
2394         while ((skb = __skb_dequeue(&entry->skb_list))) {
2395                 skb_put_data(rx->skb, skb->data, skb->len);
2396                 dev_kfree_skb(skb);
2397         }
2398
2399  out:
2400         ieee80211_led_rx(rx->local);
2401         if (rx->sta)
2402                 rx->link_sta->rx_stats.packets++;
2403         return RX_CONTINUE;
2404 }
2405
2406 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2407 {
2408         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2409                 return -EACCES;
2410
2411         return 0;
2412 }
2413
2414 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2415 {
2416         struct sk_buff *skb = rx->skb;
2417         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2418
2419         /*
2420          * Pass through unencrypted frames if the hardware has
2421          * decrypted them already.
2422          */
2423         if (status->flag & RX_FLAG_DECRYPTED)
2424                 return 0;
2425
2426         /* Drop unencrypted frames if key is set. */
2427         if (unlikely(!ieee80211_has_protected(fc) &&
2428                      !ieee80211_is_any_nullfunc(fc) &&
2429                      ieee80211_is_data(fc) && rx->key))
2430                 return -EACCES;
2431
2432         return 0;
2433 }
2434
2435 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result
2436 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2437 {
2438         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2439         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2440         __le16 fc = mgmt->frame_control;
2441
2442         /*
2443          * Pass through unencrypted frames if the hardware has
2444          * decrypted them already.
2445          */
2446         if (status->flag & RX_FLAG_DECRYPTED)
2447                 return RX_CONTINUE;
2448
2449         /* drop unicast protected dual (that wasn't protected) */
2450         if (ieee80211_is_action(fc) &&
2451             mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
2452                 return RX_DROP_U_UNPROT_DUAL;
2453
2454         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2455                 if (unlikely(!ieee80211_has_protected(fc) &&
2456                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) {
2457                         if (ieee80211_is_deauth(fc) ||
2458                             ieee80211_is_disassoc(fc)) {
2459                                 /*
2460                                  * Permit unprotected deauth/disassoc frames
2461                                  * during 4-way-HS (key is installed after HS).
2462                                  */
2463                                 if (!rx->key)
2464                                         return RX_CONTINUE;
2465
2466                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2467                                                              rx->skb->data,
2468                                                              rx->skb->len);
2469                         }
2470                         return RX_DROP_U_UNPROT_UCAST_MGMT;
2471                 }
2472                 /* BIP does not use Protected field, so need to check MMIE */
2473                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2474                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2475                         if (ieee80211_is_deauth(fc) ||
2476                             ieee80211_is_disassoc(fc))
2477                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2478                                                              rx->skb->data,
2479                                                              rx->skb->len);
2480                         return RX_DROP_U_UNPROT_MCAST_MGMT;
2481                 }
2482                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2483                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2484                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2485                                                      rx->skb->data,
2486                                                      rx->skb->len);
2487                         return RX_DROP_U_UNPROT_BEACON;
2488                 }
2489                 /*
2490                  * When using MFP, Action frames are not allowed prior to
2491                  * having configured keys.
2492                  */
2493                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2494                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2495                         return RX_DROP_U_UNPROT_ACTION;
2496
2497                 /* drop unicast public action frames when using MPF */
2498                 if (is_unicast_ether_addr(mgmt->da) &&
2499                     ieee80211_is_protected_dual_of_public_action(rx->skb))
2500                         return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION;
2501         }
2502
2503         /*
2504          * Drop robust action frames before assoc regardless of MFP state,
2505          * after assoc we also have decided on MFP or not.
2506          */
2507         if (ieee80211_is_action(fc) &&
2508             ieee80211_is_robust_mgmt_frame(rx->skb) &&
2509             (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))
2510                 return RX_DROP_U_UNPROT_ROBUST_ACTION;
2511
2512         return RX_CONTINUE;
2513 }
2514 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt);
2515
2516 static ieee80211_rx_result
2517 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2518 {
2519         struct ieee80211_sub_if_data *sdata = rx->sdata;
2520         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2521         bool check_port_control = false;
2522         struct ethhdr *ehdr;
2523         int ret;
2524
2525         *port_control = false;
2526         if (ieee80211_has_a4(hdr->frame_control) &&
2527             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2528                 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR;
2529
2530         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2531             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2532                 if (!sdata->u.mgd.use_4addr)
2533                         return RX_DROP_U_UNEXPECTED_STA_4ADDR;
2534                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2535                         check_port_control = true;
2536         }
2537
2538         if (is_multicast_ether_addr(hdr->addr1) &&
2539             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2540                 return RX_DROP_U_UNEXPECTED_VLAN_MCAST;
2541
2542         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2543         if (ret < 0)
2544                 return RX_DROP_U_INVALID_8023;
2545
2546         ehdr = (struct ethhdr *) rx->skb->data;
2547         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2548                 *port_control = true;
2549         else if (check_port_control)
2550                 return RX_DROP_U_NOT_PORT_CONTROL;
2551
2552         return RX_CONTINUE;
2553 }
2554
2555 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2556                            const u8 *addr, int *out_link_id)
2557 {
2558         unsigned int link_id;
2559
2560         /* non-MLO, or MLD address replaced by hardware */
2561         if (ether_addr_equal(sdata->vif.addr, addr))
2562                 return true;
2563
2564         if (!ieee80211_vif_is_mld(&sdata->vif))
2565                 return false;
2566
2567         for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2568                 struct ieee80211_bss_conf *conf;
2569
2570                 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2571
2572                 if (!conf)
2573                         continue;
2574                 if (ether_addr_equal(conf->addr, addr)) {
2575                         if (out_link_id)
2576                                 *out_link_id = link_id;
2577                         return true;
2578                 }
2579         }
2580
2581         return false;
2582 }
2583
2584 /*
2585  * requires that rx->skb is a frame with ethernet header
2586  */
2587 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2588 {
2589         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2590                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2591         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2592
2593         /*
2594          * Allow EAPOL frames to us/the PAE group address regardless of
2595          * whether the frame was encrypted or not, and always disallow
2596          * all other destination addresses for them.
2597          */
2598         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2599                 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
2600                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2601
2602         if (ieee80211_802_1x_port_control(rx) ||
2603             ieee80211_drop_unencrypted(rx, fc))
2604                 return false;
2605
2606         return true;
2607 }
2608
2609 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2610                                                  struct ieee80211_rx_data *rx)
2611 {
2612         struct ieee80211_sub_if_data *sdata = rx->sdata;
2613         struct net_device *dev = sdata->dev;
2614
2615         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2616                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2617                       !sdata->control_port_no_preauth)) &&
2618                      sdata->control_port_over_nl80211)) {
2619                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2620                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2621
2622                 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id);
2623                 dev_kfree_skb(skb);
2624         } else {
2625                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2626
2627                 memset(skb->cb, 0, sizeof(skb->cb));
2628
2629                 /*
2630                  * 802.1X over 802.11 requires that the authenticator address
2631                  * be used for EAPOL frames. However, 802.1X allows the use of
2632                  * the PAE group address instead. If the interface is part of
2633                  * a bridge and we pass the frame with the PAE group address,
2634                  * then the bridge will forward it to the network (even if the
2635                  * client was not associated yet), which isn't supposed to
2636                  * happen.
2637                  * To avoid that, rewrite the destination address to our own
2638                  * address, so that the authenticator (e.g. hostapd) will see
2639                  * the frame, but bridge won't forward it anywhere else. Note
2640                  * that due to earlier filtering, the only other address can
2641                  * be the PAE group address, unless the hardware allowed them
2642                  * through in 802.3 offloaded mode.
2643                  */
2644                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2645                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2646                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2647
2648                 /* deliver to local stack */
2649                 if (rx->list)
2650                         list_add_tail(&skb->list, rx->list);
2651                 else
2652                         netif_receive_skb(skb);
2653         }
2654 }
2655
2656 /*
2657  * requires that rx->skb is a frame with ethernet header
2658  */
2659 static void
2660 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2661 {
2662         struct ieee80211_sub_if_data *sdata = rx->sdata;
2663         struct net_device *dev = sdata->dev;
2664         struct sk_buff *skb, *xmit_skb;
2665         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2666         struct sta_info *dsta;
2667
2668         skb = rx->skb;
2669         xmit_skb = NULL;
2670
2671         dev_sw_netstats_rx_add(dev, skb->len);
2672
2673         if (rx->sta) {
2674                 /* The seqno index has the same property as needed
2675                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2676                  * for non-QoS-data frames. Here we know it's a data
2677                  * frame, so count MSDUs.
2678                  */
2679                 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
2680                 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2681                 u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
2682         }
2683
2684         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2685              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2686             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2687             ehdr->h_proto != rx->sdata->control_port_protocol &&
2688             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2689                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2690                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2691                         /*
2692                          * send multicast frames both to higher layers in
2693                          * local net stack and back to the wireless medium
2694                          */
2695                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2696                         if (!xmit_skb)
2697                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2698                                                     dev->name);
2699                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2700                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2701                         dsta = sta_info_get(sdata, ehdr->h_dest);
2702                         if (dsta) {
2703                                 /*
2704                                  * The destination station is associated to
2705                                  * this AP (in this VLAN), so send the frame
2706                                  * directly to it and do not pass it to local
2707                                  * net stack.
2708                                  */
2709                                 xmit_skb = skb;
2710                                 skb = NULL;
2711                         }
2712                 }
2713         }
2714
2715 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2716         if (skb) {
2717                 /* 'align' will only take the values 0 or 2 here since all
2718                  * frames are required to be aligned to 2-byte boundaries
2719                  * when being passed to mac80211; the code here works just
2720                  * as well if that isn't true, but mac80211 assumes it can
2721                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2722                  */
2723                 int align;
2724
2725                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2726                 if (align) {
2727                         if (WARN_ON(skb_headroom(skb) < 3)) {
2728                                 dev_kfree_skb(skb);
2729                                 skb = NULL;
2730                         } else {
2731                                 u8 *data = skb->data;
2732                                 size_t len = skb_headlen(skb);
2733                                 skb->data -= align;
2734                                 memmove(skb->data, data, len);
2735                                 skb_set_tail_pointer(skb, len);
2736                         }
2737                 }
2738         }
2739 #endif
2740
2741         if (skb) {
2742                 skb->protocol = eth_type_trans(skb, dev);
2743                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2744         }
2745
2746         if (xmit_skb) {
2747                 /*
2748                  * Send to wireless media and increase priority by 256 to
2749                  * keep the received priority instead of reclassifying
2750                  * the frame (see cfg80211_classify8021d).
2751                  */
2752                 xmit_skb->priority += 256;
2753                 xmit_skb->protocol = htons(ETH_P_802_3);
2754                 skb_reset_network_header(xmit_skb);
2755                 skb_reset_mac_header(xmit_skb);
2756                 dev_queue_xmit(xmit_skb);
2757         }
2758 }
2759
2760 #ifdef CONFIG_MAC80211_MESH
2761 static bool
2762 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
2763                                struct sk_buff *skb, int hdrlen)
2764 {
2765         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2766         struct ieee80211_mesh_fast_tx *entry = NULL;
2767         struct ieee80211s_hdr *mesh_hdr;
2768         struct tid_ampdu_tx *tid_tx;
2769         struct sta_info *sta;
2770         struct ethhdr eth;
2771         u8 tid;
2772
2773         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
2774         if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2775                 entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
2776         else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
2777                 entry = mesh_fast_tx_get(sdata, skb->data);
2778         if (!entry)
2779                 return false;
2780
2781         sta = rcu_dereference(entry->mpath->next_hop);
2782         if (!sta)
2783                 return false;
2784
2785         if (skb_linearize(skb))
2786                 return false;
2787
2788         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2789         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2790         if (tid_tx) {
2791                 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2792                         return false;
2793
2794                 if (tid_tx->timeout)
2795                         tid_tx->last_tx = jiffies;
2796         }
2797
2798         ieee80211_aggr_check(sdata, sta, skb);
2799
2800         if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
2801                                             &skb->protocol))
2802                 hdrlen += ETH_ALEN;
2803         else
2804                 skb->protocol = htons(skb->len - hdrlen);
2805         skb_set_network_header(skb, hdrlen + 2);
2806
2807         skb->dev = sdata->dev;
2808         memcpy(&eth, skb->data, ETH_HLEN - 2);
2809         skb_pull(skb, 2);
2810         __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
2811                               eth.h_dest, eth.h_source);
2812         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2813         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2814
2815         return true;
2816 }
2817 #endif
2818
2819 static ieee80211_rx_result
2820 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
2821                        struct sk_buff *skb)
2822 {
2823 #ifdef CONFIG_MAC80211_MESH
2824         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2825         struct ieee80211_local *local = sdata->local;
2826         uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
2827         struct ieee80211_hdr hdr = {
2828                 .frame_control = cpu_to_le16(fc)
2829         };
2830         struct ieee80211_hdr *fwd_hdr;
2831         struct ieee80211s_hdr *mesh_hdr;
2832         struct ieee80211_tx_info *info;
2833         struct sk_buff *fwd_skb;
2834         struct ethhdr *eth;
2835         bool multicast;
2836         int tailroom = 0;
2837         int hdrlen, mesh_hdrlen;
2838         u8 *qos;
2839
2840         if (!ieee80211_vif_is_mesh(&sdata->vif))
2841                 return RX_CONTINUE;
2842
2843         if (!pskb_may_pull(skb, sizeof(*eth) + 6))
2844                 return RX_DROP_MONITOR;
2845
2846         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
2847         mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);
2848
2849         if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
2850                 return RX_DROP_MONITOR;
2851
2852         eth = (struct ethhdr *)skb->data;
2853         multicast = is_multicast_ether_addr(eth->h_dest);
2854
2855         mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
2856         if (!mesh_hdr->ttl)
2857                 return RX_DROP_MONITOR;
2858
2859         /* frame is in RMC, don't forward */
2860         if (is_multicast_ether_addr(eth->h_dest) &&
2861             mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
2862                 return RX_DROP_MONITOR;
2863
2864         /* forward packet */
2865         if (sdata->crypto_tx_tailroom_needed_cnt)
2866                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2867
2868         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2869                 struct mesh_path *mppath;
2870                 char *proxied_addr;
2871                 bool update = false;
2872
2873                 if (multicast)
2874                         proxied_addr = mesh_hdr->eaddr1;
2875                 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2876                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2877                         proxied_addr = mesh_hdr->eaddr2;
2878                 else
2879                         return RX_DROP_MONITOR;
2880
2881                 rcu_read_lock();
2882                 mppath = mpp_path_lookup(sdata, proxied_addr);
2883                 if (!mppath) {
2884                         mpp_path_add(sdata, proxied_addr, eth->h_source);
2885                 } else {
2886                         spin_lock_bh(&mppath->state_lock);
2887                         if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
2888                                 memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
2889                                 update = true;
2890                         }
2891                         mppath->exp_time = jiffies;
2892                         spin_unlock_bh(&mppath->state_lock);
2893                 }
2894
2895                 /* flush fast xmit cache if the address path changed */
2896                 if (update)
2897                         mesh_fast_tx_flush_addr(sdata, proxied_addr);
2898
2899                 rcu_read_unlock();
2900         }
2901
2902         /* Frame has reached destination.  Don't forward */
2903         if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
2904                 goto rx_accept;
2905
2906         if (!--mesh_hdr->ttl) {
2907                 if (multicast)
2908                         goto rx_accept;
2909
2910                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2911                 return RX_DROP_MONITOR;
2912         }
2913
2914         if (!ifmsh->mshcfg.dot11MeshForwarding) {
2915                 if (is_multicast_ether_addr(eth->h_dest))
2916                         goto rx_accept;
2917
2918                 return RX_DROP_MONITOR;
2919         }
2920
2921         skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
2922
2923         if (!multicast &&
2924             ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
2925                 return RX_QUEUED;
2926
2927         ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
2928                                       eth->h_dest, eth->h_source);
2929         hdrlen = ieee80211_hdrlen(hdr.frame_control);
2930         if (multicast) {
2931                 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
2932
2933                 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
2934                                                IEEE80211_ENCRYPT_HEADROOM,
2935                                           tailroom, GFP_ATOMIC);
2936                 if (!fwd_skb)
2937                         goto rx_accept;
2938         } else {
2939                 fwd_skb = skb;
2940                 skb = NULL;
2941
2942                 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
2943                         return RX_DROP_U_OOM;
2944
2945                 if (skb_linearize(fwd_skb))
2946                         return RX_DROP_U_OOM;
2947         }
2948
2949         fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
2950         memcpy(fwd_hdr, &hdr, hdrlen - 2);
2951         qos = ieee80211_get_qos_ctl(fwd_hdr);
2952         qos[0] = qos[1] = 0;
2953
2954         skb_reset_mac_header(fwd_skb);
2955         hdrlen += mesh_hdrlen;
2956         if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
2957                                             &fwd_skb->protocol))
2958                 hdrlen += ETH_ALEN;
2959         else
2960                 fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
2961         skb_set_network_header(fwd_skb, hdrlen + 2);
2962
2963         info = IEEE80211_SKB_CB(fwd_skb);
2964         memset(info, 0, sizeof(*info));
2965         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2966         info->control.vif = &sdata->vif;
2967         info->control.jiffies = jiffies;
2968         fwd_skb->dev = sdata->dev;
2969         if (multicast) {
2970                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2971                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2972                 /* update power mode indication when forwarding */
2973                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2974         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2975                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2976                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2977         } else {
2978                 /* unable to resolve next hop */
2979                 if (sta)
2980                         mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2981                                            hdr.addr3, 0,
2982                                            WLAN_REASON_MESH_PATH_NOFORWARD,
2983                                            sta->sta.addr);
2984                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2985                 kfree_skb(fwd_skb);
2986                 goto rx_accept;
2987         }
2988
2989         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2990         ieee80211_add_pending_skb(local, fwd_skb);
2991
2992 rx_accept:
2993         if (!skb)
2994                 return RX_QUEUED;
2995
2996         ieee80211_strip_8023_mesh_hdr(skb);
2997 #endif
2998
2999         return RX_CONTINUE;
3000 }
3001
3002 static ieee80211_rx_result debug_noinline
3003 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
3004 {
3005         struct net_device *dev = rx->sdata->dev;
3006         struct sk_buff *skb = rx->skb;
3007         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3008         __le16 fc = hdr->frame_control;
3009         struct sk_buff_head frame_list;
3010         ieee80211_rx_result res;
3011         struct ethhdr ethhdr;
3012         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
3013
3014         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3015                 check_da = NULL;
3016                 check_sa = NULL;
3017         } else switch (rx->sdata->vif.type) {
3018                 case NL80211_IFTYPE_AP:
3019                 case NL80211_IFTYPE_AP_VLAN:
3020                         check_da = NULL;
3021                         break;
3022                 case NL80211_IFTYPE_STATION:
3023                         if (!rx->sta ||
3024                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
3025                                 check_sa = NULL;
3026                         break;
3027                 case NL80211_IFTYPE_MESH_POINT:
3028                         check_sa = NULL;
3029                         check_da = NULL;
3030                         break;
3031                 default:
3032                         break;
3033         }
3034
3035         skb->dev = dev;
3036         __skb_queue_head_init(&frame_list);
3037
3038         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
3039                                           rx->sdata->vif.addr,
3040                                           rx->sdata->vif.type,
3041                                           data_offset, true))
3042                 return RX_DROP_U_BAD_AMSDU;
3043
3044         if (rx->sta->amsdu_mesh_control < 0) {
3045                 s8 valid = -1;
3046                 int i;
3047
3048                 for (i = 0; i <= 2; i++) {
3049                         if (!ieee80211_is_valid_amsdu(skb, i))
3050                                 continue;
3051
3052                         if (valid >= 0) {
3053                                 /* ambiguous */
3054                                 valid = -1;
3055                                 break;
3056                         }
3057
3058                         valid = i;
3059                 }
3060
3061                 rx->sta->amsdu_mesh_control = valid;
3062         }
3063
3064         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
3065                                  rx->sdata->vif.type,
3066                                  rx->local->hw.extra_tx_headroom,
3067                                  check_da, check_sa,
3068                                  rx->sta->amsdu_mesh_control);
3069
3070         while (!skb_queue_empty(&frame_list)) {
3071                 rx->skb = __skb_dequeue(&frame_list);
3072
3073                 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3074                 switch (res) {
3075                 case RX_QUEUED:
3076                         continue;
3077                 case RX_CONTINUE:
3078                         break;
3079                 default:
3080                         goto free;
3081                 }
3082
3083                 if (!ieee80211_frame_allowed(rx, fc))
3084                         goto free;
3085
3086                 ieee80211_deliver_skb(rx);
3087                 continue;
3088
3089 free:
3090                 dev_kfree_skb(rx->skb);
3091         }
3092
3093         return RX_QUEUED;
3094 }
3095
3096 static ieee80211_rx_result debug_noinline
3097 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
3098 {
3099         struct sk_buff *skb = rx->skb;
3100         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3101         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3102         __le16 fc = hdr->frame_control;
3103
3104         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
3105                 return RX_CONTINUE;
3106
3107         if (unlikely(!ieee80211_is_data(fc)))
3108                 return RX_CONTINUE;
3109
3110         if (unlikely(!ieee80211_is_data_present(fc)))
3111                 return RX_DROP_MONITOR;
3112
3113         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3114                 switch (rx->sdata->vif.type) {
3115                 case NL80211_IFTYPE_AP_VLAN:
3116                         if (!rx->sdata->u.vlan.sta)
3117                                 return RX_DROP_U_BAD_4ADDR;
3118                         break;
3119                 case NL80211_IFTYPE_STATION:
3120                         if (!rx->sdata->u.mgd.use_4addr)
3121                                 return RX_DROP_U_BAD_4ADDR;
3122                         break;
3123                 case NL80211_IFTYPE_MESH_POINT:
3124                         break;
3125                 default:
3126                         return RX_DROP_U_BAD_4ADDR;
3127                 }
3128         }
3129
3130         if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
3131                 return RX_DROP_U_BAD_AMSDU;
3132
3133         if (rx->key) {
3134                 /*
3135                  * We should not receive A-MSDUs on pre-HT connections,
3136                  * and HT connections cannot use old ciphers. Thus drop
3137                  * them, as in those cases we couldn't even have SPP
3138                  * A-MSDUs or such.
3139                  */
3140                 switch (rx->key->conf.cipher) {
3141                 case WLAN_CIPHER_SUITE_WEP40:
3142                 case WLAN_CIPHER_SUITE_WEP104:
3143                 case WLAN_CIPHER_SUITE_TKIP:
3144                         return RX_DROP_U_BAD_AMSDU_CIPHER;
3145                 default:
3146                         break;
3147                 }
3148         }
3149
3150         return __ieee80211_rx_h_amsdu(rx, 0);
3151 }
3152
3153 static ieee80211_rx_result debug_noinline
3154 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3155 {
3156         struct ieee80211_sub_if_data *sdata = rx->sdata;
3157         struct ieee80211_local *local = rx->local;
3158         struct net_device *dev = sdata->dev;
3159         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3160         __le16 fc = hdr->frame_control;
3161         ieee80211_rx_result res;
3162         bool port_control;
3163
3164         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3165                 return RX_CONTINUE;
3166
3167         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3168                 return RX_DROP_MONITOR;
3169
3170         /*
3171          * Send unexpected-4addr-frame event to hostapd. For older versions,
3172          * also drop the frame to cooked monitor interfaces.
3173          */
3174         if (ieee80211_has_a4(hdr->frame_control) &&
3175             sdata->vif.type == NL80211_IFTYPE_AP) {
3176                 if (rx->sta &&
3177                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3178                         cfg80211_rx_unexpected_4addr_frame(
3179                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3180                 return RX_DROP_MONITOR;
3181         }
3182
3183         res = __ieee80211_data_to_8023(rx, &port_control);
3184         if (unlikely(res != RX_CONTINUE))
3185                 return res;
3186
3187         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3188         if (res != RX_CONTINUE)
3189                 return res;
3190
3191         if (!ieee80211_frame_allowed(rx, fc))
3192                 return RX_DROP_MONITOR;
3193
3194         /* directly handle TDLS channel switch requests/responses */
3195         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3196                                                 cpu_to_be16(ETH_P_TDLS))) {
3197                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3198
3199                 if (pskb_may_pull(rx->skb,
3200                                   offsetof(struct ieee80211_tdls_data, u)) &&
3201                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3202                     tf->category == WLAN_CATEGORY_TDLS &&
3203                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3204                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3205                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3206                         __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3207                                                        rx->sta, rx->skb);
3208                         return RX_QUEUED;
3209                 }
3210         }
3211
3212         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3213             unlikely(port_control) && sdata->bss) {
3214                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3215                                      u.ap);
3216                 dev = sdata->dev;
3217                 rx->sdata = sdata;
3218         }
3219
3220         rx->skb->dev = dev;
3221
3222         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3223             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3224             !is_multicast_ether_addr(
3225                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3226             (!local->scanning &&
3227              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3228                 mod_timer(&local->dynamic_ps_timer, jiffies +
3229                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3230
3231         ieee80211_deliver_skb(rx);
3232
3233         return RX_QUEUED;
3234 }
3235
3236 static ieee80211_rx_result debug_noinline
3237 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3238 {
3239         struct sk_buff *skb = rx->skb;
3240         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3241         struct tid_ampdu_rx *tid_agg_rx;
3242         u16 start_seq_num;
3243         u16 tid;
3244
3245         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3246                 return RX_CONTINUE;
3247
3248         if (ieee80211_is_back_req(bar->frame_control)) {
3249                 struct {
3250                         __le16 control, start_seq_num;
3251                 } __packed bar_data;
3252                 struct ieee80211_event event = {
3253                         .type = BAR_RX_EVENT,
3254                 };
3255
3256                 if (!rx->sta)
3257                         return RX_DROP_MONITOR;
3258
3259                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3260                                   &bar_data, sizeof(bar_data)))
3261                         return RX_DROP_MONITOR;
3262
3263                 tid = le16_to_cpu(bar_data.control) >> 12;
3264
3265                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3266                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3267                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3268                                              WLAN_BACK_RECIPIENT,
3269                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3270
3271                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3272                 if (!tid_agg_rx)
3273                         return RX_DROP_MONITOR;
3274
3275                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3276                 event.u.ba.tid = tid;
3277                 event.u.ba.ssn = start_seq_num;
3278                 event.u.ba.sta = &rx->sta->sta;
3279
3280                 /* reset session timer */
3281                 if (tid_agg_rx->timeout)
3282                         mod_timer(&tid_agg_rx->session_timer,
3283                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3284
3285                 spin_lock(&tid_agg_rx->reorder_lock);
3286                 /* release stored frames up to start of BAR */
3287                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3288                                                  start_seq_num, frames);
3289                 spin_unlock(&tid_agg_rx->reorder_lock);
3290
3291                 drv_event_callback(rx->local, rx->sdata, &event);
3292
3293                 kfree_skb(skb);
3294                 return RX_QUEUED;
3295         }
3296
3297         /*
3298          * After this point, we only want management frames,
3299          * so we can drop all remaining control frames to
3300          * cooked monitor interfaces.
3301          */
3302         return RX_DROP_MONITOR;
3303 }
3304
3305 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3306                                            struct ieee80211_mgmt *mgmt,
3307                                            size_t len)
3308 {
3309         struct ieee80211_local *local = sdata->local;
3310         struct sk_buff *skb;
3311         struct ieee80211_mgmt *resp;
3312
3313         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3314                 /* Not to own unicast address */
3315                 return;
3316         }
3317
3318         if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3319             !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3320                 /* Not from the current AP or not associated yet. */
3321                 return;
3322         }
3323
3324         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3325                 /* Too short SA Query request frame */
3326                 return;
3327         }
3328
3329         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3330         if (skb == NULL)
3331                 return;
3332
3333         skb_reserve(skb, local->hw.extra_tx_headroom);
3334         resp = skb_put_zero(skb, 24);
3335         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3336         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3337         memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3338         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3339                                           IEEE80211_STYPE_ACTION);
3340         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3341         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3342         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3343         memcpy(resp->u.action.u.sa_query.trans_id,
3344                mgmt->u.action.u.sa_query.trans_id,
3345                WLAN_SA_QUERY_TR_ID_LEN);
3346
3347         ieee80211_tx_skb(sdata, skb);
3348 }
3349
3350 static void
3351 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3352 {
3353         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3354         const struct element *ie;
3355         size_t baselen;
3356
3357         if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3358                                      NL80211_EXT_FEATURE_BSS_COLOR))
3359                 return;
3360
3361         if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3362                 return;
3363
3364         if (rx->sdata->vif.bss_conf.csa_active)
3365                 return;
3366
3367         baselen = mgmt->u.beacon.variable - rx->skb->data;
3368         if (baselen > rx->skb->len)
3369                 return;
3370
3371         ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3372                                     mgmt->u.beacon.variable,
3373                                     rx->skb->len - baselen);
3374         if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3375             ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3376                 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3377                 const struct ieee80211_he_operation *he_oper;
3378                 u8 color;
3379
3380                 he_oper = (void *)(ie->data + 1);
3381                 if (le32_get_bits(he_oper->he_oper_params,
3382                                   IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3383                         return;
3384
3385                 color = le32_get_bits(he_oper->he_oper_params,
3386                                       IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3387                 if (color == bss_conf->he_bss_color.color)
3388                         ieee80211_obss_color_collision_notify(&rx->sdata->vif,
3389                                                               BIT_ULL(color));
3390         }
3391 }
3392
3393 static ieee80211_rx_result debug_noinline
3394 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3395 {
3396         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3397         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3398
3399         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3400                 return RX_CONTINUE;
3401
3402         /*
3403          * From here on, look only at management frames.
3404          * Data and control frames are already handled,
3405          * and unknown (reserved) frames are useless.
3406          */
3407         if (rx->skb->len < 24)
3408                 return RX_DROP_MONITOR;
3409
3410         if (!ieee80211_is_mgmt(mgmt->frame_control))
3411                 return RX_DROP_MONITOR;
3412
3413         /* drop too small action frames */
3414         if (ieee80211_is_action(mgmt->frame_control) &&
3415             rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
3416                 return RX_DROP_U_RUNT_ACTION;
3417
3418         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3419             ieee80211_is_beacon(mgmt->frame_control) &&
3420             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3421                 int sig = 0;
3422
3423                 /* sw bss color collision detection */
3424                 ieee80211_rx_check_bss_color_collision(rx);
3425
3426                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3427                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3428                         sig = status->signal;
3429
3430                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3431                                                 rx->skb->data, rx->skb->len,
3432                                                 ieee80211_rx_status_to_khz(status),
3433                                                 sig);
3434                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3435         }
3436
3437         return ieee80211_drop_unencrypted_mgmt(rx);
3438 }
3439
3440 static bool
3441 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3442 {
3443         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3444         struct ieee80211_sub_if_data *sdata = rx->sdata;
3445
3446         /* TWT actions are only supported in AP for the moment */
3447         if (sdata->vif.type != NL80211_IFTYPE_AP)
3448                 return false;
3449
3450         if (!rx->local->ops->add_twt_setup)
3451                 return false;
3452
3453         if (!sdata->vif.bss_conf.twt_responder)
3454                 return false;
3455
3456         if (!rx->sta)
3457                 return false;
3458
3459         switch (mgmt->u.action.u.s1g.action_code) {
3460         case WLAN_S1G_TWT_SETUP: {
3461                 struct ieee80211_twt_setup *twt;
3462
3463                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3464                                    1 + /* action code */
3465                                    sizeof(struct ieee80211_twt_setup) +
3466                                    2 /* TWT req_type agrt */)
3467                         break;
3468
3469                 twt = (void *)mgmt->u.action.u.s1g.variable;
3470                 if (twt->element_id != WLAN_EID_S1G_TWT)
3471                         break;
3472
3473                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3474                                    4 + /* action code + token + tlv */
3475                                    twt->length)
3476                         break;
3477
3478                 return true; /* queue the frame */
3479         }
3480         case WLAN_S1G_TWT_TEARDOWN:
3481                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3482                         break;
3483
3484                 return true; /* queue the frame */
3485         default:
3486                 break;
3487         }
3488
3489         return false;
3490 }
3491
3492 static ieee80211_rx_result debug_noinline
3493 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3494 {
3495         struct ieee80211_local *local = rx->local;
3496         struct ieee80211_sub_if_data *sdata = rx->sdata;
3497         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3498         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3499         int len = rx->skb->len;
3500
3501         if (!ieee80211_is_action(mgmt->frame_control))
3502                 return RX_CONTINUE;
3503
3504         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3505             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3506             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3507                 return RX_DROP_U_ACTION_UNKNOWN_SRC;
3508
3509         switch (mgmt->u.action.category) {
3510         case WLAN_CATEGORY_HT:
3511                 /* reject HT action frames from stations not supporting HT */
3512                 if (!rx->link_sta->pub->ht_cap.ht_supported)
3513                         goto invalid;
3514
3515                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3516                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3517                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3518                     sdata->vif.type != NL80211_IFTYPE_AP &&
3519                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3520                         break;
3521
3522                 /* verify action & smps_control/chanwidth are present */
3523                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3524                         goto invalid;
3525
3526                 switch (mgmt->u.action.u.ht_smps.action) {
3527                 case WLAN_HT_ACTION_SMPS: {
3528                         struct ieee80211_supported_band *sband;
3529                         enum ieee80211_smps_mode smps_mode;
3530                         struct sta_opmode_info sta_opmode = {};
3531
3532                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3533                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3534                                 goto handled;
3535
3536                         /* convert to HT capability */
3537                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3538                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3539                                 smps_mode = IEEE80211_SMPS_OFF;
3540                                 break;
3541                         case WLAN_HT_SMPS_CONTROL_STATIC:
3542                                 smps_mode = IEEE80211_SMPS_STATIC;
3543                                 break;
3544                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3545                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3546                                 break;
3547                         default:
3548                                 goto invalid;
3549                         }
3550
3551                         /* if no change do nothing */
3552                         if (rx->link_sta->pub->smps_mode == smps_mode)
3553                                 goto handled;
3554                         rx->link_sta->pub->smps_mode = smps_mode;
3555                         sta_opmode.smps_mode =
3556                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3557                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3558
3559                         sband = rx->local->hw.wiphy->bands[status->band];
3560
3561                         rate_control_rate_update(local, sband, rx->sta, 0,
3562                                                  IEEE80211_RC_SMPS_CHANGED);
3563                         cfg80211_sta_opmode_change_notify(sdata->dev,
3564                                                           rx->sta->addr,
3565                                                           &sta_opmode,
3566                                                           GFP_ATOMIC);
3567                         goto handled;
3568                 }
3569                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3570                         struct ieee80211_supported_band *sband;
3571                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3572                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3573                         struct sta_opmode_info sta_opmode = {};
3574
3575                         /* If it doesn't support 40 MHz it can't change ... */
3576                         if (!(rx->link_sta->pub->ht_cap.cap &
3577                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3578                                 goto handled;
3579
3580                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3581                                 max_bw = IEEE80211_STA_RX_BW_20;
3582                         else
3583                                 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3584
3585                         /* set cur_max_bandwidth and recalc sta bw */
3586                         rx->link_sta->cur_max_bandwidth = max_bw;
3587                         new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3588
3589                         if (rx->link_sta->pub->bandwidth == new_bw)
3590                                 goto handled;
3591
3592                         rx->link_sta->pub->bandwidth = new_bw;
3593                         sband = rx->local->hw.wiphy->bands[status->band];
3594                         sta_opmode.bw =
3595                                 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3596                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3597
3598                         rate_control_rate_update(local, sband, rx->sta, 0,
3599                                                  IEEE80211_RC_BW_CHANGED);
3600                         cfg80211_sta_opmode_change_notify(sdata->dev,
3601                                                           rx->sta->addr,
3602                                                           &sta_opmode,
3603                                                           GFP_ATOMIC);
3604                         goto handled;
3605                 }
3606                 default:
3607                         goto invalid;
3608                 }
3609
3610                 break;
3611         case WLAN_CATEGORY_PUBLIC:
3612                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3613                         goto invalid;
3614                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3615                         break;
3616                 if (!rx->sta)
3617                         break;
3618                 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3619                         break;
3620                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3621                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3622                         break;
3623                 if (len < offsetof(struct ieee80211_mgmt,
3624                                    u.action.u.ext_chan_switch.variable))
3625                         goto invalid;
3626                 goto queue;
3627         case WLAN_CATEGORY_VHT:
3628                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3629                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3630                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3631                     sdata->vif.type != NL80211_IFTYPE_AP &&
3632                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3633                         break;
3634
3635                 /* verify action code is present */
3636                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3637                         goto invalid;
3638
3639                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3640                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3641                         /* verify opmode is present */
3642                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3643                                 goto invalid;
3644                         goto queue;
3645                 }
3646                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3647                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3648                                 goto invalid;
3649                         goto queue;
3650                 }
3651                 default:
3652                         break;
3653                 }
3654                 break;
3655         case WLAN_CATEGORY_BACK:
3656                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3657                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3658                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3659                     sdata->vif.type != NL80211_IFTYPE_AP &&
3660                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3661                         break;
3662
3663                 /* verify action_code is present */
3664                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3665                         break;
3666
3667                 switch (mgmt->u.action.u.addba_req.action_code) {
3668                 case WLAN_ACTION_ADDBA_REQ:
3669                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3670                                    sizeof(mgmt->u.action.u.addba_req)))
3671                                 goto invalid;
3672                         break;
3673                 case WLAN_ACTION_ADDBA_RESP:
3674                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3675                                    sizeof(mgmt->u.action.u.addba_resp)))
3676                                 goto invalid;
3677                         break;
3678                 case WLAN_ACTION_DELBA:
3679                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3680                                    sizeof(mgmt->u.action.u.delba)))
3681                                 goto invalid;
3682                         break;
3683                 default:
3684                         goto invalid;
3685                 }
3686
3687                 goto queue;
3688         case WLAN_CATEGORY_SPECTRUM_MGMT:
3689                 /* verify action_code is present */
3690                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3691                         break;
3692
3693                 switch (mgmt->u.action.u.measurement.action_code) {
3694                 case WLAN_ACTION_SPCT_MSR_REQ:
3695                         if (status->band != NL80211_BAND_5GHZ)
3696                                 break;
3697
3698                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3699                                    sizeof(mgmt->u.action.u.measurement)))
3700                                 break;
3701
3702                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3703                                 break;
3704
3705                         ieee80211_process_measurement_req(sdata, mgmt, len);
3706                         goto handled;
3707                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3708                         u8 *bssid;
3709                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3710                                    sizeof(mgmt->u.action.u.chan_switch)))
3711                                 break;
3712
3713                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3714                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3715                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3716                                 break;
3717
3718                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3719                                 bssid = sdata->deflink.u.mgd.bssid;
3720                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3721                                 bssid = sdata->u.ibss.bssid;
3722                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3723                                 bssid = mgmt->sa;
3724                         else
3725                                 break;
3726
3727                         if (!ether_addr_equal(mgmt->bssid, bssid))
3728                                 break;
3729
3730                         goto queue;
3731                         }
3732                 }
3733                 break;
3734         case WLAN_CATEGORY_SELF_PROTECTED:
3735                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3736                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3737                         break;
3738
3739                 switch (mgmt->u.action.u.self_prot.action_code) {
3740                 case WLAN_SP_MESH_PEERING_OPEN:
3741                 case WLAN_SP_MESH_PEERING_CLOSE:
3742                 case WLAN_SP_MESH_PEERING_CONFIRM:
3743                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3744                                 goto invalid;
3745                         if (sdata->u.mesh.user_mpm)
3746                                 /* userspace handles this frame */
3747                                 break;
3748                         goto queue;
3749                 case WLAN_SP_MGK_INFORM:
3750                 case WLAN_SP_MGK_ACK:
3751                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3752                                 goto invalid;
3753                         break;
3754                 }
3755                 break;
3756         case WLAN_CATEGORY_MESH_ACTION:
3757                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3758                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3759                         break;
3760
3761                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3762                         break;
3763                 if (mesh_action_is_path_sel(mgmt) &&
3764                     !mesh_path_sel_is_hwmp(sdata))
3765                         break;
3766                 goto queue;
3767         case WLAN_CATEGORY_S1G:
3768                 if (len < offsetofend(typeof(*mgmt),
3769                                       u.action.u.s1g.action_code))
3770                         break;
3771
3772                 switch (mgmt->u.action.u.s1g.action_code) {
3773                 case WLAN_S1G_TWT_SETUP:
3774                 case WLAN_S1G_TWT_TEARDOWN:
3775                         if (ieee80211_process_rx_twt_action(rx))
3776                                 goto queue;
3777                         break;
3778                 default:
3779                         break;
3780                 }
3781                 break;
3782         case WLAN_CATEGORY_PROTECTED_EHT:
3783                 switch (mgmt->u.action.u.ttlm_req.action_code) {
3784                 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
3785                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3786                                 break;
3787
3788                         if (len < offsetofend(typeof(*mgmt),
3789                                               u.action.u.ttlm_req))
3790                                 goto invalid;
3791                         goto queue;
3792                 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
3793                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3794                                 break;
3795
3796                         if (len < offsetofend(typeof(*mgmt),
3797                                               u.action.u.ttlm_res))
3798                                 goto invalid;
3799                         goto queue;
3800                 default:
3801                         break;
3802                 }
3803                 break;
3804         }
3805
3806         return RX_CONTINUE;
3807
3808  invalid:
3809         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3810         /* will return in the next handlers */
3811         return RX_CONTINUE;
3812
3813  handled:
3814         if (rx->sta)
3815                 rx->link_sta->rx_stats.packets++;
3816         dev_kfree_skb(rx->skb);
3817         return RX_QUEUED;
3818
3819  queue:
3820         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3821         return RX_QUEUED;
3822 }
3823
3824 static ieee80211_rx_result debug_noinline
3825 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3826 {
3827         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3828         struct cfg80211_rx_info info = {
3829                 .freq = ieee80211_rx_status_to_khz(status),
3830                 .buf = rx->skb->data,
3831                 .len = rx->skb->len,
3832                 .link_id = rx->link_id,
3833                 .have_link_id = rx->link_id >= 0,
3834         };
3835
3836         /* skip known-bad action frames and return them in the next handler */
3837         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3838                 return RX_CONTINUE;
3839
3840         /*
3841          * Getting here means the kernel doesn't know how to handle
3842          * it, but maybe userspace does ... include returned frames
3843          * so userspace can register for those to know whether ones
3844          * it transmitted were processed or returned.
3845          */
3846
3847         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3848             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3849                 info.sig_dbm = status->signal;
3850
3851         if (ieee80211_is_timing_measurement(rx->skb) ||
3852             ieee80211_is_ftm(rx->skb)) {
3853                 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3854                 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3855         }
3856
3857         if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3858                 if (rx->sta)
3859                         rx->link_sta->rx_stats.packets++;
3860                 dev_kfree_skb(rx->skb);
3861                 return RX_QUEUED;
3862         }
3863
3864         return RX_CONTINUE;
3865 }
3866
3867 static ieee80211_rx_result debug_noinline
3868 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3869 {
3870         struct ieee80211_sub_if_data *sdata = rx->sdata;
3871         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3872         int len = rx->skb->len;
3873
3874         if (!ieee80211_is_action(mgmt->frame_control))
3875                 return RX_CONTINUE;
3876
3877         switch (mgmt->u.action.category) {
3878         case WLAN_CATEGORY_SA_QUERY:
3879                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3880                            sizeof(mgmt->u.action.u.sa_query)))
3881                         break;
3882
3883                 switch (mgmt->u.action.u.sa_query.action) {
3884                 case WLAN_ACTION_SA_QUERY_REQUEST:
3885                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3886                                 break;
3887                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3888                         goto handled;
3889                 }
3890                 break;
3891         }
3892
3893         return RX_CONTINUE;
3894
3895  handled:
3896         if (rx->sta)
3897                 rx->link_sta->rx_stats.packets++;
3898         dev_kfree_skb(rx->skb);
3899         return RX_QUEUED;
3900 }
3901
3902 static ieee80211_rx_result debug_noinline
3903 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3904 {
3905         struct ieee80211_local *local = rx->local;
3906         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3907         struct sk_buff *nskb;
3908         struct ieee80211_sub_if_data *sdata = rx->sdata;
3909         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3910
3911         if (!ieee80211_is_action(mgmt->frame_control))
3912                 return RX_CONTINUE;
3913
3914         /*
3915          * For AP mode, hostapd is responsible for handling any action
3916          * frames that we didn't handle, including returning unknown
3917          * ones. For all other modes we will return them to the sender,
3918          * setting the 0x80 bit in the action category, as required by
3919          * 802.11-2012 9.24.4.
3920          * Newer versions of hostapd shall also use the management frame
3921          * registration mechanisms, but older ones still use cooked
3922          * monitor interfaces so push all frames there.
3923          */
3924         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3925             (sdata->vif.type == NL80211_IFTYPE_AP ||
3926              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3927                 return RX_DROP_MONITOR;
3928
3929         if (is_multicast_ether_addr(mgmt->da))
3930                 return RX_DROP_MONITOR;
3931
3932         /* do not return rejected action frames */
3933         if (mgmt->u.action.category & 0x80)
3934                 return RX_DROP_U_REJECTED_ACTION_RESPONSE;
3935
3936         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3937                                GFP_ATOMIC);
3938         if (nskb) {
3939                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3940
3941                 nmgmt->u.action.category |= 0x80;
3942                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3943                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3944
3945                 memset(nskb->cb, 0, sizeof(nskb->cb));
3946
3947                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3948                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3949
3950                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3951                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3952                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3953                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3954                                 info->hw_queue =
3955                                         local->hw.offchannel_tx_hw_queue;
3956                 }
3957
3958                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3959                                             status->band);
3960         }
3961         dev_kfree_skb(rx->skb);
3962         return RX_QUEUED;
3963 }
3964
3965 static ieee80211_rx_result debug_noinline
3966 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3967 {
3968         struct ieee80211_sub_if_data *sdata = rx->sdata;
3969         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3970
3971         if (!ieee80211_is_ext(hdr->frame_control))
3972                 return RX_CONTINUE;
3973
3974         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3975                 return RX_DROP_MONITOR;
3976
3977         /* for now only beacons are ext, so queue them */
3978         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3979
3980         return RX_QUEUED;
3981 }
3982
3983 static ieee80211_rx_result debug_noinline
3984 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3985 {
3986         struct ieee80211_sub_if_data *sdata = rx->sdata;
3987         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3988         __le16 stype;
3989
3990         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3991
3992         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3993             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3994             sdata->vif.type != NL80211_IFTYPE_OCB &&
3995             sdata->vif.type != NL80211_IFTYPE_STATION)
3996                 return RX_DROP_MONITOR;
3997
3998         switch (stype) {
3999         case cpu_to_le16(IEEE80211_STYPE_AUTH):
4000         case cpu_to_le16(IEEE80211_STYPE_BEACON):
4001         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
4002                 /* process for all: mesh, mlme, ibss */
4003                 break;
4004         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
4005                 if (is_multicast_ether_addr(mgmt->da) &&
4006                     !is_broadcast_ether_addr(mgmt->da))
4007                         return RX_DROP_MONITOR;
4008
4009                 /* process only for station/IBSS */
4010                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
4011                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
4012                         return RX_DROP_MONITOR;
4013                 break;
4014         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
4015         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
4016         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
4017                 if (is_multicast_ether_addr(mgmt->da) &&
4018                     !is_broadcast_ether_addr(mgmt->da))
4019                         return RX_DROP_MONITOR;
4020
4021                 /* process only for station */
4022                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
4023                         return RX_DROP_MONITOR;
4024                 break;
4025         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
4026                 /* process only for ibss and mesh */
4027                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
4028                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
4029                         return RX_DROP_MONITOR;
4030                 break;
4031         default:
4032                 return RX_DROP_MONITOR;
4033         }
4034
4035         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
4036
4037         return RX_QUEUED;
4038 }
4039
4040 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
4041                                         struct ieee80211_rate *rate,
4042                                         ieee80211_rx_result reason)
4043 {
4044         struct ieee80211_sub_if_data *sdata;
4045         struct ieee80211_local *local = rx->local;
4046         struct sk_buff *skb = rx->skb, *skb2;
4047         struct net_device *prev_dev = NULL;
4048         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4049         int needed_headroom;
4050
4051         /*
4052          * If cooked monitor has been processed already, then
4053          * don't do it again. If not, set the flag.
4054          */
4055         if (rx->flags & IEEE80211_RX_CMNTR)
4056                 goto out_free_skb;
4057         rx->flags |= IEEE80211_RX_CMNTR;
4058
4059         /* If there are no cooked monitor interfaces, just free the SKB */
4060         if (!local->cooked_mntrs)
4061                 goto out_free_skb;
4062
4063         /* room for the radiotap header based on driver features */
4064         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
4065
4066         if (skb_headroom(skb) < needed_headroom &&
4067             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
4068                 goto out_free_skb;
4069
4070         /* prepend radiotap information */
4071         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
4072                                          false);
4073
4074         skb_reset_mac_header(skb);
4075         skb->ip_summed = CHECKSUM_UNNECESSARY;
4076         skb->pkt_type = PACKET_OTHERHOST;
4077         skb->protocol = htons(ETH_P_802_2);
4078
4079         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4080                 if (!ieee80211_sdata_running(sdata))
4081                         continue;
4082
4083                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
4084                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
4085                         continue;
4086
4087                 if (prev_dev) {
4088                         skb2 = skb_clone(skb, GFP_ATOMIC);
4089                         if (skb2) {
4090                                 skb2->dev = prev_dev;
4091                                 netif_receive_skb(skb2);
4092                         }
4093                 }
4094
4095                 prev_dev = sdata->dev;
4096                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
4097         }
4098
4099         if (prev_dev) {
4100                 skb->dev = prev_dev;
4101                 netif_receive_skb(skb);
4102                 return;
4103         }
4104
4105  out_free_skb:
4106         kfree_skb_reason(skb, (__force u32)reason);
4107 }
4108
4109 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
4110                                          ieee80211_rx_result res)
4111 {
4112         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4113         struct ieee80211_supported_band *sband;
4114         struct ieee80211_rate *rate = NULL;
4115
4116         if (res == RX_QUEUED) {
4117                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
4118                 return;
4119         }
4120
4121         if (res != RX_CONTINUE) {
4122                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
4123                 if (rx->sta)
4124                         rx->link_sta->rx_stats.dropped++;
4125         }
4126
4127         if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) ==
4128                         SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) {
4129                 kfree_skb_reason(rx->skb, (__force u32)res);
4130                 return;
4131         }
4132
4133         sband = rx->local->hw.wiphy->bands[status->band];
4134         if (status->encoding == RX_ENC_LEGACY)
4135                 rate = &sband->bitrates[status->rate_idx];
4136
4137         ieee80211_rx_cooked_monitor(rx, rate, res);
4138 }
4139
4140 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
4141                                   struct sk_buff_head *frames)
4142 {
4143         ieee80211_rx_result res = RX_DROP_MONITOR;
4144         struct sk_buff *skb;
4145
4146 #define CALL_RXH(rxh)                   \
4147         do {                            \
4148                 res = rxh(rx);          \
4149                 if (res != RX_CONTINUE) \
4150                         goto rxh_next;  \
4151         } while (0)
4152
4153         /* Lock here to avoid hitting all of the data used in the RX
4154          * path (e.g. key data, station data, ...) concurrently when
4155          * a frame is released from the reorder buffer due to timeout
4156          * from the timer, potentially concurrently with RX from the
4157          * driver.
4158          */
4159         spin_lock_bh(&rx->local->rx_path_lock);
4160
4161         while ((skb = __skb_dequeue(frames))) {
4162                 /*
4163                  * all the other fields are valid across frames
4164                  * that belong to an aMPDU since they are on the
4165                  * same TID from the same station
4166                  */
4167                 rx->skb = skb;
4168
4169                 if (WARN_ON_ONCE(!rx->link))
4170                         goto rxh_next;
4171
4172                 CALL_RXH(ieee80211_rx_h_check_more_data);
4173                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4174                 CALL_RXH(ieee80211_rx_h_sta_process);
4175                 CALL_RXH(ieee80211_rx_h_decrypt);
4176                 CALL_RXH(ieee80211_rx_h_defragment);
4177                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4178                 /* must be after MMIC verify so header is counted in MPDU mic */
4179                 CALL_RXH(ieee80211_rx_h_amsdu);
4180                 CALL_RXH(ieee80211_rx_h_data);
4181
4182                 /* special treatment -- needs the queue */
4183                 res = ieee80211_rx_h_ctrl(rx, frames);
4184                 if (res != RX_CONTINUE)
4185                         goto rxh_next;
4186
4187                 CALL_RXH(ieee80211_rx_h_mgmt_check);
4188                 CALL_RXH(ieee80211_rx_h_action);
4189                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4190                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4191                 CALL_RXH(ieee80211_rx_h_action_return);
4192                 CALL_RXH(ieee80211_rx_h_ext);
4193                 CALL_RXH(ieee80211_rx_h_mgmt);
4194
4195  rxh_next:
4196                 ieee80211_rx_handlers_result(rx, res);
4197
4198 #undef CALL_RXH
4199         }
4200
4201         spin_unlock_bh(&rx->local->rx_path_lock);
4202 }
4203
4204 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4205 {
4206         struct sk_buff_head reorder_release;
4207         ieee80211_rx_result res = RX_DROP_MONITOR;
4208
4209         __skb_queue_head_init(&reorder_release);
4210
4211 #define CALL_RXH(rxh)                   \
4212         do {                            \
4213                 res = rxh(rx);          \
4214                 if (res != RX_CONTINUE) \
4215                         goto rxh_next;  \
4216         } while (0)
4217
4218         CALL_RXH(ieee80211_rx_h_check_dup);
4219         CALL_RXH(ieee80211_rx_h_check);
4220
4221         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4222
4223         ieee80211_rx_handlers(rx, &reorder_release);
4224         return;
4225
4226  rxh_next:
4227         ieee80211_rx_handlers_result(rx, res);
4228
4229 #undef CALL_RXH
4230 }
4231
4232 static bool
4233 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4234 {
4235         return !!(sta->valid_links & BIT(link_id));
4236 }
4237
4238 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
4239                                        u8 link_id)
4240 {
4241         rx->link_id = link_id;
4242         rx->link = rcu_dereference(rx->sdata->link[link_id]);
4243
4244         if (!rx->sta)
4245                 return rx->link;
4246
4247         if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
4248                 return false;
4249
4250         rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
4251
4252         return rx->link && rx->link_sta;
4253 }
4254
4255 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
4256                                       struct sta_info *sta, int link_id)
4257 {
4258         rx->link_id = link_id;
4259         rx->sta = sta;
4260
4261         if (sta) {
4262                 rx->local = sta->sdata->local;
4263                 if (!rx->sdata)
4264                         rx->sdata = sta->sdata;
4265                 rx->link_sta = &sta->deflink;
4266         } else {
4267                 rx->link_sta = NULL;
4268         }
4269
4270         if (link_id < 0)
4271                 rx->link = &rx->sdata->deflink;
4272         else if (!ieee80211_rx_data_set_link(rx, link_id))
4273                 return false;
4274
4275         return true;
4276 }
4277
4278 /*
4279  * This function makes calls into the RX path, therefore
4280  * it has to be invoked under RCU read lock.
4281  */
4282 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4283 {
4284         struct sk_buff_head frames;
4285         struct ieee80211_rx_data rx = {
4286                 /* This is OK -- must be QoS data frame */
4287                 .security_idx = tid,
4288                 .seqno_idx = tid,
4289         };
4290         struct tid_ampdu_rx *tid_agg_rx;
4291         int link_id = -1;
4292
4293         /* FIXME: statistics won't be right with this */
4294         if (sta->sta.valid_links)
4295                 link_id = ffs(sta->sta.valid_links) - 1;
4296
4297         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
4298                 return;
4299
4300         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4301         if (!tid_agg_rx)
4302                 return;
4303
4304         __skb_queue_head_init(&frames);
4305
4306         spin_lock(&tid_agg_rx->reorder_lock);
4307         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4308         spin_unlock(&tid_agg_rx->reorder_lock);
4309
4310         if (!skb_queue_empty(&frames)) {
4311                 struct ieee80211_event event = {
4312                         .type = BA_FRAME_TIMEOUT,
4313                         .u.ba.tid = tid,
4314                         .u.ba.sta = &sta->sta,
4315                 };
4316                 drv_event_callback(rx.local, rx.sdata, &event);
4317         }
4318
4319         ieee80211_rx_handlers(&rx, &frames);
4320 }
4321
4322 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4323                                           u16 ssn, u64 filtered,
4324                                           u16 received_mpdus)
4325 {
4326         struct ieee80211_local *local;
4327         struct sta_info *sta;
4328         struct tid_ampdu_rx *tid_agg_rx;
4329         struct sk_buff_head frames;
4330         struct ieee80211_rx_data rx = {
4331                 /* This is OK -- must be QoS data frame */
4332                 .security_idx = tid,
4333                 .seqno_idx = tid,
4334         };
4335         int i, diff;
4336
4337         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4338                 return;
4339
4340         __skb_queue_head_init(&frames);
4341
4342         sta = container_of(pubsta, struct sta_info, sta);
4343
4344         local = sta->sdata->local;
4345         WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
4346                   "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
4347                   local->hw.max_rx_aggregation_subframes);
4348
4349         if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
4350                 return;
4351
4352         rcu_read_lock();
4353         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4354         if (!tid_agg_rx)
4355                 goto out;
4356
4357         spin_lock_bh(&tid_agg_rx->reorder_lock);
4358
4359         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4360                 int release;
4361
4362                 /* release all frames in the reorder buffer */
4363                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4364                            IEEE80211_SN_MODULO;
4365                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4366                                                  release, &frames);
4367                 /* update ssn to match received ssn */
4368                 tid_agg_rx->head_seq_num = ssn;
4369         } else {
4370                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4371                                                  &frames);
4372         }
4373
4374         /* handle the case that received ssn is behind the mac ssn.
4375          * it can be tid_agg_rx->buf_size behind and still be valid */
4376         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4377         if (diff >= tid_agg_rx->buf_size) {
4378                 tid_agg_rx->reorder_buf_filtered = 0;
4379                 goto release;
4380         }
4381         filtered = filtered >> diff;
4382         ssn += diff;
4383
4384         /* update bitmap */
4385         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4386                 int index = (ssn + i) % tid_agg_rx->buf_size;
4387
4388                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4389                 if (filtered & BIT_ULL(i))
4390                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4391         }
4392
4393         /* now process also frames that the filter marking released */
4394         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4395
4396 release:
4397         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4398
4399         ieee80211_rx_handlers(&rx, &frames);
4400
4401  out:
4402         rcu_read_unlock();
4403 }
4404 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4405
4406 /* main receive path */
4407
4408 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4409 {
4410         return ether_addr_equal(raddr, addr) ||
4411                is_broadcast_ether_addr(raddr);
4412 }
4413
4414 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4415 {
4416         struct ieee80211_sub_if_data *sdata = rx->sdata;
4417         struct sk_buff *skb = rx->skb;
4418         struct ieee80211_hdr *hdr = (void *)skb->data;
4419         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4420         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4421         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4422                          ieee80211_is_s1g_beacon(hdr->frame_control);
4423
4424         switch (sdata->vif.type) {
4425         case NL80211_IFTYPE_STATION:
4426                 if (!bssid && !sdata->u.mgd.use_4addr)
4427                         return false;
4428                 if (ieee80211_is_first_frag(hdr->seq_ctrl) &&
4429                     ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4430                         return false;
4431                 if (multicast)
4432                         return true;
4433                 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4434         case NL80211_IFTYPE_ADHOC:
4435                 if (!bssid)
4436                         return false;
4437                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4438                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4439                     !is_valid_ether_addr(hdr->addr2))
4440                         return false;
4441                 if (ieee80211_is_beacon(hdr->frame_control))
4442                         return true;
4443                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4444                         return false;
4445                 if (!multicast &&
4446                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4447                         return false;
4448                 if (!rx->sta) {
4449                         int rate_idx;
4450                         if (status->encoding != RX_ENC_LEGACY)
4451                                 rate_idx = 0; /* TODO: HT/VHT rates */
4452                         else
4453                                 rate_idx = status->rate_idx;
4454                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4455                                                  BIT(rate_idx));
4456                 }
4457                 return true;
4458         case NL80211_IFTYPE_OCB:
4459                 if (!bssid)
4460                         return false;
4461                 if (!ieee80211_is_data_present(hdr->frame_control))
4462                         return false;
4463                 if (!is_broadcast_ether_addr(bssid))
4464                         return false;
4465                 if (!multicast &&
4466                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4467                         return false;
4468                 if (!rx->sta) {
4469                         int rate_idx;
4470                         if (status->encoding != RX_ENC_LEGACY)
4471                                 rate_idx = 0; /* TODO: HT rates */
4472                         else
4473                                 rate_idx = status->rate_idx;
4474                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4475                                                 BIT(rate_idx));
4476                 }
4477                 return true;
4478         case NL80211_IFTYPE_MESH_POINT:
4479                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4480                         return false;
4481                 if (multicast)
4482                         return true;
4483                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4484         case NL80211_IFTYPE_AP_VLAN:
4485         case NL80211_IFTYPE_AP:
4486                 if (!bssid)
4487                         return ieee80211_is_our_addr(sdata, hdr->addr1,
4488                                                      &rx->link_id);
4489
4490                 if (!is_broadcast_ether_addr(bssid) &&
4491                     !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4492                         /*
4493                          * Accept public action frames even when the
4494                          * BSSID doesn't match, this is used for P2P
4495                          * and location updates. Note that mac80211
4496                          * itself never looks at these frames.
4497                          */
4498                         if (!multicast &&
4499                             !ieee80211_is_our_addr(sdata, hdr->addr1,
4500                                                    &rx->link_id))
4501                                 return false;
4502                         if (ieee80211_is_public_action(hdr, skb->len))
4503                                 return true;
4504                         return ieee80211_is_beacon(hdr->frame_control);
4505                 }
4506
4507                 if (!ieee80211_has_tods(hdr->frame_control)) {
4508                         /* ignore data frames to TDLS-peers */
4509                         if (ieee80211_is_data(hdr->frame_control))
4510                                 return false;
4511                         /* ignore action frames to TDLS-peers */
4512                         if (ieee80211_is_action(hdr->frame_control) &&
4513                             !is_broadcast_ether_addr(bssid) &&
4514                             !ether_addr_equal(bssid, hdr->addr1))
4515                                 return false;
4516                 }
4517
4518                 /*
4519                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4520                  * the BSSID - we've checked that already but may have accepted
4521                  * the wildcard (ff:ff:ff:ff:ff:ff).
4522                  *
4523                  * It also says:
4524                  *      The BSSID of the Data frame is determined as follows:
4525                  *      a) If the STA is contained within an AP or is associated
4526                  *         with an AP, the BSSID is the address currently in use
4527                  *         by the STA contained in the AP.
4528                  *
4529                  * So we should not accept data frames with an address that's
4530                  * multicast.
4531                  *
4532                  * Accepting it also opens a security problem because stations
4533                  * could encrypt it with the GTK and inject traffic that way.
4534                  */
4535                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4536                         return false;
4537
4538                 return true;
4539         case NL80211_IFTYPE_P2P_DEVICE:
4540                 return ieee80211_is_public_action(hdr, skb->len) ||
4541                        ieee80211_is_probe_req(hdr->frame_control) ||
4542                        ieee80211_is_probe_resp(hdr->frame_control) ||
4543                        ieee80211_is_beacon(hdr->frame_control);
4544         case NL80211_IFTYPE_NAN:
4545                 /* Currently no frames on NAN interface are allowed */
4546                 return false;
4547         default:
4548                 break;
4549         }
4550
4551         WARN_ON_ONCE(1);
4552         return false;
4553 }
4554
4555 void ieee80211_check_fast_rx(struct sta_info *sta)
4556 {
4557         struct ieee80211_sub_if_data *sdata = sta->sdata;
4558         struct ieee80211_local *local = sdata->local;
4559         struct ieee80211_key *key;
4560         struct ieee80211_fast_rx fastrx = {
4561                 .dev = sdata->dev,
4562                 .vif_type = sdata->vif.type,
4563                 .control_port_protocol = sdata->control_port_protocol,
4564         }, *old, *new = NULL;
4565         u32 offload_flags;
4566         bool set_offload = false;
4567         bool assign = false;
4568         bool offload;
4569
4570         /* use sparse to check that we don't return without updating */
4571         __acquire(check_fast_rx);
4572
4573         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4574         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4575         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4576         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4577
4578         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4579
4580         /* fast-rx doesn't do reordering */
4581         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4582             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4583                 goto clear;
4584
4585         switch (sdata->vif.type) {
4586         case NL80211_IFTYPE_STATION:
4587                 if (sta->sta.tdls) {
4588                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4589                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4590                         fastrx.expected_ds_bits = 0;
4591                 } else {
4592                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4593                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4594                         fastrx.expected_ds_bits =
4595                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4596                 }
4597
4598                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4599                         fastrx.expected_ds_bits |=
4600                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4601                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4602                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4603                 }
4604
4605                 if (!sdata->u.mgd.powersave)
4606                         break;
4607
4608                 /* software powersave is a huge mess, avoid all of it */
4609                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4610                         goto clear;
4611                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4612                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4613                         goto clear;
4614                 break;
4615         case NL80211_IFTYPE_AP_VLAN:
4616         case NL80211_IFTYPE_AP:
4617                 /* parallel-rx requires this, at least with calls to
4618                  * ieee80211_sta_ps_transition()
4619                  */
4620                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4621                         goto clear;
4622                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4623                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4624                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4625
4626                 fastrx.internal_forward =
4627                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4628                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4629                          !sdata->u.vlan.sta);
4630
4631                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4632                     sdata->u.vlan.sta) {
4633                         fastrx.expected_ds_bits |=
4634                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4635                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4636                         fastrx.internal_forward = 0;
4637                 }
4638
4639                 break;
4640         case NL80211_IFTYPE_MESH_POINT:
4641                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
4642                                                       IEEE80211_FCTL_TODS);
4643                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4644                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4645                 break;
4646         default:
4647                 goto clear;
4648         }
4649
4650         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4651                 goto clear;
4652
4653         rcu_read_lock();
4654         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4655         if (!key)
4656                 key = rcu_dereference(sdata->default_unicast_key);
4657         if (key) {
4658                 switch (key->conf.cipher) {
4659                 case WLAN_CIPHER_SUITE_TKIP:
4660                         /* we don't want to deal with MMIC in fast-rx */
4661                         goto clear_rcu;
4662                 case WLAN_CIPHER_SUITE_CCMP:
4663                 case WLAN_CIPHER_SUITE_CCMP_256:
4664                 case WLAN_CIPHER_SUITE_GCMP:
4665                 case WLAN_CIPHER_SUITE_GCMP_256:
4666                         break;
4667                 default:
4668                         /* We also don't want to deal with
4669                          * WEP or cipher scheme.
4670                          */
4671                         goto clear_rcu;
4672                 }
4673
4674                 fastrx.key = true;
4675                 fastrx.icv_len = key->conf.icv_len;
4676         }
4677
4678         assign = true;
4679  clear_rcu:
4680         rcu_read_unlock();
4681  clear:
4682         __release(check_fast_rx);
4683
4684         if (assign)
4685                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4686
4687         offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4688         offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4689
4690         if (assign && offload)
4691                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4692         else
4693                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4694
4695         if (set_offload)
4696                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4697
4698         spin_lock_bh(&sta->lock);
4699         old = rcu_dereference_protected(sta->fast_rx, true);
4700         rcu_assign_pointer(sta->fast_rx, new);
4701         spin_unlock_bh(&sta->lock);
4702
4703         if (old)
4704                 kfree_rcu(old, rcu_head);
4705 }
4706
4707 void ieee80211_clear_fast_rx(struct sta_info *sta)
4708 {
4709         struct ieee80211_fast_rx *old;
4710
4711         spin_lock_bh(&sta->lock);
4712         old = rcu_dereference_protected(sta->fast_rx, true);
4713         RCU_INIT_POINTER(sta->fast_rx, NULL);
4714         spin_unlock_bh(&sta->lock);
4715
4716         if (old)
4717                 kfree_rcu(old, rcu_head);
4718 }
4719
4720 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4721 {
4722         struct ieee80211_local *local = sdata->local;
4723         struct sta_info *sta;
4724
4725         lockdep_assert_wiphy(local->hw.wiphy);
4726
4727         list_for_each_entry(sta, &local->sta_list, list) {
4728                 if (sdata != sta->sdata &&
4729                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4730                         continue;
4731                 ieee80211_check_fast_rx(sta);
4732         }
4733 }
4734
4735 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4736 {
4737         struct ieee80211_local *local = sdata->local;
4738
4739         lockdep_assert_wiphy(local->hw.wiphy);
4740
4741         __ieee80211_check_fast_rx_iface(sdata);
4742 }
4743
4744 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4745                               struct ieee80211_fast_rx *fast_rx,
4746                               int orig_len)
4747 {
4748         struct ieee80211_sta_rx_stats *stats;
4749         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4750         struct sta_info *sta = rx->sta;
4751         struct link_sta_info *link_sta;
4752         struct sk_buff *skb = rx->skb;
4753         void *sa = skb->data + ETH_ALEN;
4754         void *da = skb->data;
4755
4756         if (rx->link_id >= 0) {
4757                 link_sta = rcu_dereference(sta->link[rx->link_id]);
4758                 if (WARN_ON_ONCE(!link_sta)) {
4759                         dev_kfree_skb(rx->skb);
4760                         return;
4761                 }
4762         } else {
4763                 link_sta = &sta->deflink;
4764         }
4765
4766         stats = &link_sta->rx_stats;
4767         if (fast_rx->uses_rss)
4768                 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4769
4770         /* statistics part of ieee80211_rx_h_sta_process() */
4771         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4772                 stats->last_signal = status->signal;
4773                 if (!fast_rx->uses_rss)
4774                         ewma_signal_add(&link_sta->rx_stats_avg.signal,
4775                                         -status->signal);
4776         }
4777
4778         if (status->chains) {
4779                 int i;
4780
4781                 stats->chains = status->chains;
4782                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4783                         int signal = status->chain_signal[i];
4784
4785                         if (!(status->chains & BIT(i)))
4786                                 continue;
4787
4788                         stats->chain_signal_last[i] = signal;
4789                         if (!fast_rx->uses_rss)
4790                                 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4791                                                 -signal);
4792                 }
4793         }
4794         /* end of statistics */
4795
4796         stats->last_rx = jiffies;
4797         stats->last_rate = sta_stats_encode_rate(status);
4798
4799         stats->fragments++;
4800         stats->packets++;
4801
4802         skb->dev = fast_rx->dev;
4803
4804         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4805
4806         /* The seqno index has the same property as needed
4807          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4808          * for non-QoS-data frames. Here we know it's a data
4809          * frame, so count MSDUs.
4810          */
4811         u64_stats_update_begin(&stats->syncp);
4812         stats->msdu[rx->seqno_idx]++;
4813         stats->bytes += orig_len;
4814         u64_stats_update_end(&stats->syncp);
4815
4816         if (fast_rx->internal_forward) {
4817                 struct sk_buff *xmit_skb = NULL;
4818                 if (is_multicast_ether_addr(da)) {
4819                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4820                 } else if (!ether_addr_equal(da, sa) &&
4821                            sta_info_get(rx->sdata, da)) {
4822                         xmit_skb = skb;
4823                         skb = NULL;
4824                 }
4825
4826                 if (xmit_skb) {
4827                         /*
4828                          * Send to wireless media and increase priority by 256
4829                          * to keep the received priority instead of
4830                          * reclassifying the frame (see cfg80211_classify8021d).
4831                          */
4832                         xmit_skb->priority += 256;
4833                         xmit_skb->protocol = htons(ETH_P_802_3);
4834                         skb_reset_network_header(xmit_skb);
4835                         skb_reset_mac_header(xmit_skb);
4836                         dev_queue_xmit(xmit_skb);
4837                 }
4838
4839                 if (!skb)
4840                         return;
4841         }
4842
4843         /* deliver to local stack */
4844         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4845         ieee80211_deliver_skb_to_local_stack(skb, rx);
4846 }
4847
4848 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4849                                      struct ieee80211_fast_rx *fast_rx)
4850 {
4851         struct sk_buff *skb = rx->skb;
4852         struct ieee80211_hdr *hdr = (void *)skb->data;
4853         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4854         static ieee80211_rx_result res;
4855         int orig_len = skb->len;
4856         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4857         int snap_offs = hdrlen;
4858         struct {
4859                 u8 snap[sizeof(rfc1042_header)];
4860                 __be16 proto;
4861         } *payload __aligned(2);
4862         struct {
4863                 u8 da[ETH_ALEN];
4864                 u8 sa[ETH_ALEN];
4865         } addrs __aligned(2);
4866         struct ieee80211_sta_rx_stats *stats;
4867
4868         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4869          * to a common data structure; drivers can implement that per queue
4870          * but we don't have that information in mac80211
4871          */
4872         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4873                 return false;
4874
4875 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4876
4877         /* If using encryption, we also need to have:
4878          *  - PN_VALIDATED: similar, but the implementation is tricky
4879          *  - DECRYPTED: necessary for PN_VALIDATED
4880          */
4881         if (fast_rx->key &&
4882             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4883                 return false;
4884
4885         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4886                 return false;
4887
4888         if (unlikely(ieee80211_is_frag(hdr)))
4889                 return false;
4890
4891         /* Since our interface address cannot be multicast, this
4892          * implicitly also rejects multicast frames without the
4893          * explicit check.
4894          *
4895          * We shouldn't get any *data* frames not addressed to us
4896          * (AP mode will accept multicast *management* frames), but
4897          * punting here will make it go through the full checks in
4898          * ieee80211_accept_frame().
4899          */
4900         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4901                 return false;
4902
4903         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4904                                               IEEE80211_FCTL_TODS)) !=
4905             fast_rx->expected_ds_bits)
4906                 return false;
4907
4908         /* assign the key to drop unencrypted frames (later)
4909          * and strip the IV/MIC if necessary
4910          */
4911         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4912                 /* GCMP header length is the same */
4913                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4914         }
4915
4916         if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
4917             !(status->rx_flags & IEEE80211_RX_AMSDU)) {
4918                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4919                         return false;
4920
4921                 payload = (void *)(skb->data + snap_offs);
4922
4923                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4924                         return false;
4925
4926                 /* Don't handle these here since they require special code.
4927                  * Accept AARP and IPX even though they should come with a
4928                  * bridge-tunnel header - but if we get them this way then
4929                  * there's little point in discarding them.
4930                  */
4931                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4932                              payload->proto == fast_rx->control_port_protocol))
4933                         return false;
4934         }
4935
4936         /* after this point, don't punt to the slowpath! */
4937
4938         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4939             pskb_trim(skb, skb->len - fast_rx->icv_len))
4940                 goto drop;
4941
4942         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4943                 goto drop;
4944
4945         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4946                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4947                     RX_QUEUED)
4948                         goto drop;
4949
4950                 return true;
4951         }
4952
4953         /* do the header conversion - first grab the addresses */
4954         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4955         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4956         if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
4957             skb_pull(skb, snap_offs - 2);
4958             put_unaligned_be16(skb->len - 2, skb->data);
4959         } else {
4960             skb_postpull_rcsum(skb, skb->data + snap_offs,
4961                                sizeof(rfc1042_header) + 2);
4962
4963             /* remove the SNAP but leave the ethertype */
4964             skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4965         }
4966         /* push the addresses in front */
4967         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4968
4969         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
4970         switch (res) {
4971         case RX_QUEUED:
4972                 return true;
4973         case RX_CONTINUE:
4974                 break;
4975         default:
4976                 goto drop;
4977         }
4978
4979         ieee80211_rx_8023(rx, fast_rx, orig_len);
4980
4981         return true;
4982  drop:
4983         dev_kfree_skb(skb);
4984
4985         if (fast_rx->uses_rss)
4986                 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
4987         else
4988                 stats = &rx->link_sta->rx_stats;
4989
4990         stats->dropped++;
4991         return true;
4992 }
4993
4994 /*
4995  * This function returns whether or not the SKB
4996  * was destined for RX processing or not, which,
4997  * if consume is true, is equivalent to whether
4998  * or not the skb was consumed.
4999  */
5000 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
5001                                             struct sk_buff *skb, bool consume)
5002 {
5003         struct ieee80211_local *local = rx->local;
5004         struct ieee80211_sub_if_data *sdata = rx->sdata;
5005         struct ieee80211_hdr *hdr = (void *)skb->data;
5006         struct link_sta_info *link_sta = rx->link_sta;
5007         struct ieee80211_link_data *link = rx->link;
5008
5009         rx->skb = skb;
5010
5011         /* See if we can do fast-rx; if we have to copy we already lost,
5012          * so punt in that case. We should never have to deliver a data
5013          * frame to multiple interfaces anyway.
5014          *
5015          * We skip the ieee80211_accept_frame() call and do the necessary
5016          * checking inside ieee80211_invoke_fast_rx().
5017          */
5018         if (consume && rx->sta) {
5019                 struct ieee80211_fast_rx *fast_rx;
5020
5021                 fast_rx = rcu_dereference(rx->sta->fast_rx);
5022                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
5023                         return true;
5024         }
5025
5026         if (!ieee80211_accept_frame(rx))
5027                 return false;
5028
5029         if (!consume) {
5030                 struct skb_shared_hwtstamps *shwt;
5031
5032                 rx->skb = skb_copy(skb, GFP_ATOMIC);
5033                 if (!rx->skb) {
5034                         if (net_ratelimit())
5035                                 wiphy_debug(local->hw.wiphy,
5036                                         "failed to copy skb for %s\n",
5037                                         sdata->name);
5038                         return true;
5039                 }
5040
5041                 /* skb_copy() does not copy the hw timestamps, so copy it
5042                  * explicitly
5043                  */
5044                 shwt = skb_hwtstamps(rx->skb);
5045                 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
5046
5047                 /* Update the hdr pointer to the new skb for translation below */
5048                 hdr = (struct ieee80211_hdr *)rx->skb->data;
5049         }
5050
5051         if (unlikely(rx->sta && rx->sta->sta.mlo) &&
5052             is_unicast_ether_addr(hdr->addr1) &&
5053             !ieee80211_is_probe_resp(hdr->frame_control) &&
5054             !ieee80211_is_beacon(hdr->frame_control)) {
5055                 /* translate to MLD addresses */
5056                 if (ether_addr_equal(link->conf->addr, hdr->addr1))
5057                         ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
5058                 if (ether_addr_equal(link_sta->addr, hdr->addr2))
5059                         ether_addr_copy(hdr->addr2, rx->sta->addr);
5060                 /* translate A3 only if it's the BSSID */
5061                 if (!ieee80211_has_tods(hdr->frame_control) &&
5062                     !ieee80211_has_fromds(hdr->frame_control)) {
5063                         if (ether_addr_equal(link_sta->addr, hdr->addr3))
5064                                 ether_addr_copy(hdr->addr3, rx->sta->addr);
5065                         else if (ether_addr_equal(link->conf->addr, hdr->addr3))
5066                                 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
5067                 }
5068                 /* not needed for A4 since it can only carry the SA */
5069         }
5070
5071         ieee80211_invoke_rx_handlers(rx);
5072         return true;
5073 }
5074
5075 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
5076                                        struct ieee80211_sta *pubsta,
5077                                        struct sk_buff *skb,
5078                                        struct list_head *list)
5079 {
5080         struct ieee80211_local *local = hw_to_local(hw);
5081         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5082         struct ieee80211_fast_rx *fast_rx;
5083         struct ieee80211_rx_data rx;
5084         struct sta_info *sta;
5085         int link_id = -1;
5086
5087         memset(&rx, 0, sizeof(rx));
5088         rx.skb = skb;
5089         rx.local = local;
5090         rx.list = list;
5091         rx.link_id = -1;
5092
5093         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5094
5095         /* drop frame if too short for header */
5096         if (skb->len < sizeof(struct ethhdr))
5097                 goto drop;
5098
5099         if (!pubsta)
5100                 goto drop;
5101
5102         if (status->link_valid)
5103                 link_id = status->link_id;
5104
5105         /*
5106          * TODO: Should the frame be dropped if the right link_id is not
5107          * available? Or may be it is fine in the current form to proceed with
5108          * the frame processing because with frame being in 802.3 format,
5109          * link_id is used only for stats purpose and updating the stats on
5110          * the deflink is fine?
5111          */
5112         sta = container_of(pubsta, struct sta_info, sta);
5113         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5114                 goto drop;
5115
5116         fast_rx = rcu_dereference(rx.sta->fast_rx);
5117         if (!fast_rx)
5118                 goto drop;
5119
5120         ieee80211_rx_8023(&rx, fast_rx, skb->len);
5121         return;
5122
5123 drop:
5124         dev_kfree_skb(skb);
5125 }
5126
5127 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
5128                                        struct sk_buff *skb, bool consume)
5129 {
5130         struct link_sta_info *link_sta;
5131         struct ieee80211_hdr *hdr = (void *)skb->data;
5132         struct sta_info *sta;
5133         int link_id = -1;
5134
5135         /*
5136          * Look up link station first, in case there's a
5137          * chance that they might have a link address that
5138          * is identical to the MLD address, that way we'll
5139          * have the link information if needed.
5140          */
5141         link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
5142         if (link_sta) {
5143                 sta = link_sta->sta;
5144                 link_id = link_sta->link_id;
5145         } else {
5146                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5147
5148                 sta = sta_info_get_bss(rx->sdata, hdr->addr2);
5149                 if (status->link_valid)
5150                         link_id = status->link_id;
5151         }
5152
5153         if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
5154                 return false;
5155
5156         return ieee80211_prepare_and_rx_handle(rx, skb, consume);
5157 }
5158
5159 /*
5160  * This is the actual Rx frames handler. as it belongs to Rx path it must
5161  * be called with rcu_read_lock protection.
5162  */
5163 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
5164                                          struct ieee80211_sta *pubsta,
5165                                          struct sk_buff *skb,
5166                                          struct list_head *list)
5167 {
5168         struct ieee80211_local *local = hw_to_local(hw);
5169         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5170         struct ieee80211_sub_if_data *sdata;
5171         struct ieee80211_hdr *hdr;
5172         __le16 fc;
5173         struct ieee80211_rx_data rx;
5174         struct ieee80211_sub_if_data *prev;
5175         struct rhlist_head *tmp;
5176         int err = 0;
5177
5178         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5179         memset(&rx, 0, sizeof(rx));
5180         rx.skb = skb;
5181         rx.local = local;
5182         rx.list = list;
5183         rx.link_id = -1;
5184
5185         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5186                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5187
5188         if (ieee80211_is_mgmt(fc)) {
5189                 /* drop frame if too short for header */
5190                 if (skb->len < ieee80211_hdrlen(fc))
5191                         err = -ENOBUFS;
5192                 else
5193                         err = skb_linearize(skb);
5194         } else {
5195                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5196         }
5197
5198         if (err) {
5199                 dev_kfree_skb(skb);
5200                 return;
5201         }
5202
5203         hdr = (struct ieee80211_hdr *)skb->data;
5204         ieee80211_parse_qos(&rx);
5205         ieee80211_verify_alignment(&rx);
5206
5207         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5208                      ieee80211_is_beacon(hdr->frame_control) ||
5209                      ieee80211_is_s1g_beacon(hdr->frame_control)))
5210                 ieee80211_scan_rx(local, skb);
5211
5212         if (ieee80211_is_data(fc)) {
5213                 struct sta_info *sta, *prev_sta;
5214                 int link_id = -1;
5215
5216                 if (status->link_valid)
5217                         link_id = status->link_id;
5218
5219                 if (pubsta) {
5220                         sta = container_of(pubsta, struct sta_info, sta);
5221                         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5222                                 goto out;
5223
5224                         /*
5225                          * In MLO connection, fetch the link_id using addr2
5226                          * when the driver does not pass link_id in status.
5227                          * When the address translation is already performed by
5228                          * driver/hw, the valid link_id must be passed in
5229                          * status.
5230                          */
5231
5232                         if (!status->link_valid && pubsta->mlo) {
5233                                 struct link_sta_info *link_sta;
5234
5235                                 link_sta = link_sta_info_get_bss(rx.sdata,
5236                                                                  hdr->addr2);
5237                                 if (!link_sta)
5238                                         goto out;
5239
5240                                 ieee80211_rx_data_set_link(&rx, link_sta->link_id);
5241                         }
5242
5243                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5244                                 return;
5245                         goto out;
5246                 }
5247
5248                 prev_sta = NULL;
5249
5250                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5251                         if (!prev_sta) {
5252                                 prev_sta = sta;
5253                                 continue;
5254                         }
5255
5256                         rx.sdata = prev_sta->sdata;
5257                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5258                                 goto out;
5259
5260                         if (!status->link_valid && prev_sta->sta.mlo)
5261                                 continue;
5262
5263                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
5264
5265                         prev_sta = sta;
5266                 }
5267
5268                 if (prev_sta) {
5269                         rx.sdata = prev_sta->sdata;
5270                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5271                                 goto out;
5272
5273                         if (!status->link_valid && prev_sta->sta.mlo)
5274                                 goto out;
5275
5276                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5277                                 return;
5278                         goto out;
5279                 }
5280         }
5281
5282         prev = NULL;
5283
5284         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5285                 if (!ieee80211_sdata_running(sdata))
5286                         continue;
5287
5288                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5289                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5290                         continue;
5291
5292                 /*
5293                  * frame is destined for this interface, but if it's
5294                  * not also for the previous one we handle that after
5295                  * the loop to avoid copying the SKB once too much
5296                  */
5297
5298                 if (!prev) {
5299                         prev = sdata;
5300                         continue;
5301                 }
5302
5303                 rx.sdata = prev;
5304                 ieee80211_rx_for_interface(&rx, skb, false);
5305
5306                 prev = sdata;
5307         }
5308
5309         if (prev) {
5310                 rx.sdata = prev;
5311
5312                 if (ieee80211_rx_for_interface(&rx, skb, true))
5313                         return;
5314         }
5315
5316  out:
5317         dev_kfree_skb(skb);
5318 }
5319
5320 /*
5321  * This is the receive path handler. It is called by a low level driver when an
5322  * 802.11 MPDU is received from the hardware.
5323  */
5324 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5325                        struct sk_buff *skb, struct list_head *list)
5326 {
5327         struct ieee80211_local *local = hw_to_local(hw);
5328         struct ieee80211_rate *rate = NULL;
5329         struct ieee80211_supported_band *sband;
5330         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5331         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5332
5333         WARN_ON_ONCE(softirq_count() == 0);
5334
5335         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5336                 goto drop;
5337
5338         sband = local->hw.wiphy->bands[status->band];
5339         if (WARN_ON(!sband))
5340                 goto drop;
5341
5342         /*
5343          * If we're suspending, it is possible although not too likely
5344          * that we'd be receiving frames after having already partially
5345          * quiesced the stack. We can't process such frames then since
5346          * that might, for example, cause stations to be added or other
5347          * driver callbacks be invoked.
5348          */
5349         if (unlikely(local->quiescing || local->suspended))
5350                 goto drop;
5351
5352         /* We might be during a HW reconfig, prevent Rx for the same reason */
5353         if (unlikely(local->in_reconfig))
5354                 goto drop;
5355
5356         /*
5357          * The same happens when we're not even started,
5358          * but that's worth a warning.
5359          */
5360         if (WARN_ON(!local->started))
5361                 goto drop;
5362
5363         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5364                 /*
5365                  * Validate the rate, unless a PLCP error means that
5366                  * we probably can't have a valid rate here anyway.
5367                  */
5368
5369                 switch (status->encoding) {
5370                 case RX_ENC_HT:
5371                         /*
5372                          * rate_idx is MCS index, which can be [0-76]
5373                          * as documented on:
5374                          *
5375                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5376                          *
5377                          * Anything else would be some sort of driver or
5378                          * hardware error. The driver should catch hardware
5379                          * errors.
5380                          */
5381                         if (WARN(status->rate_idx > 76,
5382                                  "Rate marked as an HT rate but passed "
5383                                  "status->rate_idx is not "
5384                                  "an MCS index [0-76]: %d (0x%02x)\n",
5385                                  status->rate_idx,
5386                                  status->rate_idx))
5387                                 goto drop;
5388                         break;
5389                 case RX_ENC_VHT:
5390                         if (WARN_ONCE(status->rate_idx > 11 ||
5391                                       !status->nss ||
5392                                       status->nss > 8,
5393                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5394                                       status->rate_idx, status->nss))
5395                                 goto drop;
5396                         break;
5397                 case RX_ENC_HE:
5398                         if (WARN_ONCE(status->rate_idx > 11 ||
5399                                       !status->nss ||
5400                                       status->nss > 8,
5401                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5402                                       status->rate_idx, status->nss))
5403                                 goto drop;
5404                         break;
5405                 case RX_ENC_EHT:
5406                         if (WARN_ONCE(status->rate_idx > 15 ||
5407                                       !status->nss ||
5408                                       status->nss > 8 ||
5409                                       status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
5410                                       "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
5411                                       status->rate_idx, status->nss, status->eht.gi))
5412                                 goto drop;
5413                         break;
5414                 default:
5415                         WARN_ON_ONCE(1);
5416                         fallthrough;
5417                 case RX_ENC_LEGACY:
5418                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5419                                 goto drop;
5420                         rate = &sband->bitrates[status->rate_idx];
5421                 }
5422         }
5423
5424         if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5425                 goto drop;
5426
5427         status->rx_flags = 0;
5428
5429         kcov_remote_start_common(skb_get_kcov_handle(skb));
5430
5431         /*
5432          * Frames with failed FCS/PLCP checksum are not returned,
5433          * all other frames are returned without radiotap header
5434          * if it was previously present.
5435          * Also, frames with less than 16 bytes are dropped.
5436          */
5437         if (!(status->flag & RX_FLAG_8023))
5438                 skb = ieee80211_rx_monitor(local, skb, rate);
5439         if (skb) {
5440                 if ((status->flag & RX_FLAG_8023) ||
5441                         ieee80211_is_data_present(hdr->frame_control))
5442                         ieee80211_tpt_led_trig_rx(local, skb->len);
5443
5444                 if (status->flag & RX_FLAG_8023)
5445                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5446                 else
5447                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5448         }
5449
5450         kcov_remote_stop();
5451         return;
5452  drop:
5453         kfree_skb(skb);
5454 }
5455 EXPORT_SYMBOL(ieee80211_rx_list);
5456
5457 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5458                        struct sk_buff *skb, struct napi_struct *napi)
5459 {
5460         struct sk_buff *tmp;
5461         LIST_HEAD(list);
5462
5463
5464         /*
5465          * key references and virtual interfaces are protected using RCU
5466          * and this requires that we are in a read-side RCU section during
5467          * receive processing
5468          */
5469         rcu_read_lock();
5470         ieee80211_rx_list(hw, pubsta, skb, &list);
5471         rcu_read_unlock();
5472
5473         if (!napi) {
5474                 netif_receive_skb_list(&list);
5475                 return;
5476         }
5477
5478         list_for_each_entry_safe(skb, tmp, &list, list) {
5479                 skb_list_del_init(skb);
5480                 napi_gro_receive(napi, skb);
5481         }
5482 }
5483 EXPORT_SYMBOL(ieee80211_rx_napi);
5484
5485 /* This is a version of the rx handler that can be called from hard irq
5486  * context. Post the skb on the queue and schedule the tasklet */
5487 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5488 {
5489         struct ieee80211_local *local = hw_to_local(hw);
5490
5491         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5492
5493         skb->pkt_type = IEEE80211_RX_MSG;
5494         skb_queue_tail(&local->skb_queue, skb);
5495         tasklet_schedule(&local->tasklet);
5496 }
5497 EXPORT_SYMBOL(ieee80211_rx_irqsafe);