net/mac80211/rx.c

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