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) 2018-2022 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         ieee80211_queue_work(&sdata->local->hw, &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 & BIT_ULL(index))
1087                 return true;
1088
1089         if (!tail)
1090                 return false;
1091
1092         status = IEEE80211_SKB_RXCB(tail);
1093         if (status->flag & RX_FLAG_AMSDU_MORE)
1094                 return false;
1095
1096         return true;
1097 }
1098
1099 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1100                                             struct tid_ampdu_rx *tid_agg_rx,
1101                                             int index,
1102                                             struct sk_buff_head *frames)
1103 {
1104         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1105         struct sk_buff *skb;
1106         struct ieee80211_rx_status *status;
1107
1108         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1109
1110         if (skb_queue_empty(skb_list))
1111                 goto no_frame;
1112
1113         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1114                 __skb_queue_purge(skb_list);
1115                 goto no_frame;
1116         }
1117
1118         /* release frames from the reorder ring buffer */
1119         tid_agg_rx->stored_mpdu_num--;
1120         while ((skb = __skb_dequeue(skb_list))) {
1121                 status = IEEE80211_SKB_RXCB(skb);
1122                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1123                 __skb_queue_tail(frames, skb);
1124         }
1125
1126 no_frame:
1127         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1128         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1129 }
1130
1131 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1132                                              struct tid_ampdu_rx *tid_agg_rx,
1133                                              u16 head_seq_num,
1134                                              struct sk_buff_head *frames)
1135 {
1136         int index;
1137
1138         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1139
1140         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1141                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1142                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1143                                                 frames);
1144         }
1145 }
1146
1147 /*
1148  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1149  * the skb was added to the buffer longer than this time ago, the earlier
1150  * frames that have not yet been received are assumed to be lost and the skb
1151  * can be released for processing. This may also release other skb's from the
1152  * reorder buffer if there are no additional gaps between the frames.
1153  *
1154  * Callers must hold tid_agg_rx->reorder_lock.
1155  */
1156 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1157
1158 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1159                                           struct tid_ampdu_rx *tid_agg_rx,
1160                                           struct sk_buff_head *frames)
1161 {
1162         int index, i, j;
1163
1164         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1165
1166         /* release the buffer until next missing frame */
1167         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1168         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1169             tid_agg_rx->stored_mpdu_num) {
1170                 /*
1171                  * No buffers ready to be released, but check whether any
1172                  * frames in the reorder buffer have timed out.
1173                  */
1174                 int skipped = 1;
1175                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1176                      j = (j + 1) % tid_agg_rx->buf_size) {
1177                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1178                                 skipped++;
1179                                 continue;
1180                         }
1181                         if (skipped &&
1182                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1183                                         HT_RX_REORDER_BUF_TIMEOUT))
1184                                 goto set_release_timer;
1185
1186                         /* don't leave incomplete A-MSDUs around */
1187                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1188                              i = (i + 1) % tid_agg_rx->buf_size)
1189                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1190
1191                         ht_dbg_ratelimited(sdata,
1192                                            "release an RX reorder frame due to timeout on earlier frames\n");
1193                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1194                                                         frames);
1195
1196                         /*
1197                          * Increment the head seq# also for the skipped slots.
1198                          */
1199                         tid_agg_rx->head_seq_num =
1200                                 (tid_agg_rx->head_seq_num +
1201                                  skipped) & IEEE80211_SN_MASK;
1202                         skipped = 0;
1203                 }
1204         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1205                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1206                                                 frames);
1207                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1208         }
1209
1210         if (tid_agg_rx->stored_mpdu_num) {
1211                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1212
1213                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1214                      j = (j + 1) % tid_agg_rx->buf_size) {
1215                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1216                                 break;
1217                 }
1218
1219  set_release_timer:
1220
1221                 if (!tid_agg_rx->removed)
1222                         mod_timer(&tid_agg_rx->reorder_timer,
1223                                   tid_agg_rx->reorder_time[j] + 1 +
1224                                   HT_RX_REORDER_BUF_TIMEOUT);
1225         } else {
1226                 del_timer(&tid_agg_rx->reorder_timer);
1227         }
1228 }
1229
1230 /*
1231  * As this function belongs to the RX path it must be under
1232  * rcu_read_lock protection. It returns false if the frame
1233  * can be processed immediately, true if it was consumed.
1234  */
1235 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1236                                              struct tid_ampdu_rx *tid_agg_rx,
1237                                              struct sk_buff *skb,
1238                                              struct sk_buff_head *frames)
1239 {
1240         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1241         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1242         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1243         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1244         u16 head_seq_num, buf_size;
1245         int index;
1246         bool ret = true;
1247
1248         spin_lock(&tid_agg_rx->reorder_lock);
1249
1250         /*
1251          * Offloaded BA sessions have no known starting sequence number so pick
1252          * one from first Rxed frame for this tid after BA was started.
1253          */
1254         if (unlikely(tid_agg_rx->auto_seq)) {
1255                 tid_agg_rx->auto_seq = false;
1256                 tid_agg_rx->ssn = mpdu_seq_num;
1257                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1258         }
1259
1260         buf_size = tid_agg_rx->buf_size;
1261         head_seq_num = tid_agg_rx->head_seq_num;
1262
1263         /*
1264          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1265          * be reordered.
1266          */
1267         if (unlikely(!tid_agg_rx->started)) {
1268                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1269                         ret = false;
1270                         goto out;
1271                 }
1272                 tid_agg_rx->started = true;
1273         }
1274
1275         /* frame with out of date sequence number */
1276         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1277                 dev_kfree_skb(skb);
1278                 goto out;
1279         }
1280
1281         /*
1282          * If frame the sequence number exceeds our buffering window
1283          * size release some previous frames to make room for this one.
1284          */
1285         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1286                 head_seq_num = ieee80211_sn_inc(
1287                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1288                 /* release stored frames up to new head to stack */
1289                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1290                                                  head_seq_num, frames);
1291         }
1292
1293         /* Now the new frame is always in the range of the reordering buffer */
1294
1295         index = mpdu_seq_num % tid_agg_rx->buf_size;
1296
1297         /* check if we already stored this frame */
1298         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1299                 dev_kfree_skb(skb);
1300                 goto out;
1301         }
1302
1303         /*
1304          * If the current MPDU is in the right order and nothing else
1305          * is stored we can process it directly, no need to buffer it.
1306          * If it is first but there's something stored, we may be able
1307          * to release frames after this one.
1308          */
1309         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1310             tid_agg_rx->stored_mpdu_num == 0) {
1311                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1312                         tid_agg_rx->head_seq_num =
1313                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1314                 ret = false;
1315                 goto out;
1316         }
1317
1318         /* put the frame in the reordering buffer */
1319         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1320         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1321                 tid_agg_rx->reorder_time[index] = jiffies;
1322                 tid_agg_rx->stored_mpdu_num++;
1323                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1324         }
1325
1326  out:
1327         spin_unlock(&tid_agg_rx->reorder_lock);
1328         return ret;
1329 }
1330
1331 /*
1332  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1333  * true if the MPDU was buffered, false if it should be processed.
1334  */
1335 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1336                                        struct sk_buff_head *frames)
1337 {
1338         struct sk_buff *skb = rx->skb;
1339         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1340         struct sta_info *sta = rx->sta;
1341         struct tid_ampdu_rx *tid_agg_rx;
1342         u16 sc;
1343         u8 tid, ack_policy;
1344
1345         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1346             is_multicast_ether_addr(hdr->addr1))
1347                 goto dont_reorder;
1348
1349         /*
1350          * filter the QoS data rx stream according to
1351          * STA/TID and check if this STA/TID is on aggregation
1352          */
1353
1354         if (!sta)
1355                 goto dont_reorder;
1356
1357         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1358                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1359         tid = ieee80211_get_tid(hdr);
1360
1361         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1362         if (!tid_agg_rx) {
1363                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1364                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1365                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1366                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1367                                              WLAN_BACK_RECIPIENT,
1368                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1369                 goto dont_reorder;
1370         }
1371
1372         /* qos null data frames are excluded */
1373         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1374                 goto dont_reorder;
1375
1376         /* not part of a BA session */
1377         if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1378                 goto dont_reorder;
1379
1380         /* new, potentially un-ordered, ampdu frame - process it */
1381
1382         /* reset session timer */
1383         if (tid_agg_rx->timeout)
1384                 tid_agg_rx->last_rx = jiffies;
1385
1386         /* if this mpdu is fragmented - terminate rx aggregation session */
1387         sc = le16_to_cpu(hdr->seq_ctrl);
1388         if (sc & IEEE80211_SCTL_FRAG) {
1389                 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1390                 return;
1391         }
1392
1393         /*
1394          * No locking needed -- we will only ever process one
1395          * RX packet at a time, and thus own tid_agg_rx. All
1396          * other code manipulating it needs to (and does) make
1397          * sure that we cannot get to it any more before doing
1398          * anything with it.
1399          */
1400         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1401                                              frames))
1402                 return;
1403
1404  dont_reorder:
1405         __skb_queue_tail(frames, skb);
1406 }
1407
1408 static ieee80211_rx_result debug_noinline
1409 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1410 {
1411         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1413
1414         if (status->flag & RX_FLAG_DUP_VALIDATED)
1415                 return RX_CONTINUE;
1416
1417         /*
1418          * Drop duplicate 802.11 retransmissions
1419          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1420          */
1421
1422         if (rx->skb->len < 24)
1423                 return RX_CONTINUE;
1424
1425         if (ieee80211_is_ctl(hdr->frame_control) ||
1426             ieee80211_is_any_nullfunc(hdr->frame_control) ||
1427             is_multicast_ether_addr(hdr->addr1))
1428                 return RX_CONTINUE;
1429
1430         if (!rx->sta)
1431                 return RX_CONTINUE;
1432
1433         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1434                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1435                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1436                 rx->link_sta->rx_stats.num_duplicates++;
1437                 return RX_DROP_UNUSABLE;
1438         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1439                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1440         }
1441
1442         return RX_CONTINUE;
1443 }
1444
1445 static ieee80211_rx_result debug_noinline
1446 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1447 {
1448         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1449
1450         /* Drop disallowed frame classes based on STA auth/assoc state;
1451          * IEEE 802.11, Chap 5.5.
1452          *
1453          * mac80211 filters only based on association state, i.e. it drops
1454          * Class 3 frames from not associated stations. hostapd sends
1455          * deauth/disassoc frames when needed. In addition, hostapd is
1456          * responsible for filtering on both auth and assoc states.
1457          */
1458
1459         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1460                 return ieee80211_rx_mesh_check(rx);
1461
1462         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1463                       ieee80211_is_pspoll(hdr->frame_control)) &&
1464                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1465                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1466                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1467                 /*
1468                  * accept port control frames from the AP even when it's not
1469                  * yet marked ASSOC to prevent a race where we don't set the
1470                  * assoc bit quickly enough before it sends the first frame
1471                  */
1472                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1473                     ieee80211_is_data_present(hdr->frame_control)) {
1474                         unsigned int hdrlen;
1475                         __be16 ethertype;
1476
1477                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1478
1479                         if (rx->skb->len < hdrlen + 8)
1480                                 return RX_DROP_MONITOR;
1481
1482                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1483                         if (ethertype == rx->sdata->control_port_protocol)
1484                                 return RX_CONTINUE;
1485                 }
1486
1487                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1488                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1489                                                hdr->addr2,
1490                                                GFP_ATOMIC))
1491                         return RX_DROP_UNUSABLE;
1492
1493                 return RX_DROP_MONITOR;
1494         }
1495
1496         return RX_CONTINUE;
1497 }
1498
1499
1500 static ieee80211_rx_result debug_noinline
1501 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1502 {
1503         struct ieee80211_local *local;
1504         struct ieee80211_hdr *hdr;
1505         struct sk_buff *skb;
1506
1507         local = rx->local;
1508         skb = rx->skb;
1509         hdr = (struct ieee80211_hdr *) skb->data;
1510
1511         if (!local->pspolling)
1512                 return RX_CONTINUE;
1513
1514         if (!ieee80211_has_fromds(hdr->frame_control))
1515                 /* this is not from AP */
1516                 return RX_CONTINUE;
1517
1518         if (!ieee80211_is_data(hdr->frame_control))
1519                 return RX_CONTINUE;
1520
1521         if (!ieee80211_has_moredata(hdr->frame_control)) {
1522                 /* AP has no more frames buffered for us */
1523                 local->pspolling = false;
1524                 return RX_CONTINUE;
1525         }
1526
1527         /* more data bit is set, let's request a new frame from the AP */
1528         ieee80211_send_pspoll(local, rx->sdata);
1529
1530         return RX_CONTINUE;
1531 }
1532
1533 static void sta_ps_start(struct sta_info *sta)
1534 {
1535         struct ieee80211_sub_if_data *sdata = sta->sdata;
1536         struct ieee80211_local *local = sdata->local;
1537         struct ps_data *ps;
1538         int tid;
1539
1540         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1541             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1542                 ps = &sdata->bss->ps;
1543         else
1544                 return;
1545
1546         atomic_inc(&ps->num_sta_ps);
1547         set_sta_flag(sta, WLAN_STA_PS_STA);
1548         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1549                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1550         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1551                sta->sta.addr, sta->sta.aid);
1552
1553         ieee80211_clear_fast_xmit(sta);
1554
1555         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1556                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1557                 struct txq_info *txqi = to_txq_info(txq);
1558
1559                 spin_lock(&local->active_txq_lock[txq->ac]);
1560                 if (!list_empty(&txqi->schedule_order))
1561                         list_del_init(&txqi->schedule_order);
1562                 spin_unlock(&local->active_txq_lock[txq->ac]);
1563
1564                 if (txq_has_queue(txq))
1565                         set_bit(tid, &sta->txq_buffered_tids);
1566                 else
1567                         clear_bit(tid, &sta->txq_buffered_tids);
1568         }
1569 }
1570
1571 static void sta_ps_end(struct sta_info *sta)
1572 {
1573         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1574                sta->sta.addr, sta->sta.aid);
1575
1576         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1577                 /*
1578                  * Clear the flag only if the other one is still set
1579                  * so that the TX path won't start TX'ing new frames
1580                  * directly ... In the case that the driver flag isn't
1581                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1582                  */
1583                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1584                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1585                        sta->sta.addr, sta->sta.aid);
1586                 return;
1587         }
1588
1589         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1590         clear_sta_flag(sta, WLAN_STA_PS_STA);
1591         ieee80211_sta_ps_deliver_wakeup(sta);
1592 }
1593
1594 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1595 {
1596         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1597         bool in_ps;
1598
1599         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1600
1601         /* Don't let the same PS state be set twice */
1602         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1603         if ((start && in_ps) || (!start && !in_ps))
1604                 return -EINVAL;
1605
1606         if (start)
1607                 sta_ps_start(sta);
1608         else
1609                 sta_ps_end(sta);
1610
1611         return 0;
1612 }
1613 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1614
1615 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1616 {
1617         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1618
1619         if (test_sta_flag(sta, WLAN_STA_SP))
1620                 return;
1621
1622         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1623                 ieee80211_sta_ps_deliver_poll_response(sta);
1624         else
1625                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1626 }
1627 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1628
1629 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1630 {
1631         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1632         int ac = ieee80211_ac_from_tid(tid);
1633
1634         /*
1635          * If this AC is not trigger-enabled do nothing unless the
1636          * driver is calling us after it already checked.
1637          *
1638          * NB: This could/should check a separate bitmap of trigger-
1639          * enabled queues, but for now we only implement uAPSD w/o
1640          * TSPEC changes to the ACs, so they're always the same.
1641          */
1642         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1643             tid != IEEE80211_NUM_TIDS)
1644                 return;
1645
1646         /* if we are in a service period, do nothing */
1647         if (test_sta_flag(sta, WLAN_STA_SP))
1648                 return;
1649
1650         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1651                 ieee80211_sta_ps_deliver_uapsd(sta);
1652         else
1653                 set_sta_flag(sta, WLAN_STA_UAPSD);
1654 }
1655 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1656
1657 static ieee80211_rx_result debug_noinline
1658 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1659 {
1660         struct ieee80211_sub_if_data *sdata = rx->sdata;
1661         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1662         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1663
1664         if (!rx->sta)
1665                 return RX_CONTINUE;
1666
1667         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1668             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1669                 return RX_CONTINUE;
1670
1671         /*
1672          * The device handles station powersave, so don't do anything about
1673          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1674          * it to mac80211 since they're handled.)
1675          */
1676         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1677                 return RX_CONTINUE;
1678
1679         /*
1680          * Don't do anything if the station isn't already asleep. In
1681          * the uAPSD case, the station will probably be marked asleep,
1682          * in the PS-Poll case the station must be confused ...
1683          */
1684         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1685                 return RX_CONTINUE;
1686
1687         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1688                 ieee80211_sta_pspoll(&rx->sta->sta);
1689
1690                 /* Free PS Poll skb here instead of returning RX_DROP that would
1691                  * count as an dropped frame. */
1692                 dev_kfree_skb(rx->skb);
1693
1694                 return RX_QUEUED;
1695         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1696                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1697                    ieee80211_has_pm(hdr->frame_control) &&
1698                    (ieee80211_is_data_qos(hdr->frame_control) ||
1699                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1700                 u8 tid = ieee80211_get_tid(hdr);
1701
1702                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1703         }
1704
1705         return RX_CONTINUE;
1706 }
1707
1708 static ieee80211_rx_result debug_noinline
1709 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1710 {
1711         struct sta_info *sta = rx->sta;
1712         struct link_sta_info *link_sta = rx->link_sta;
1713         struct sk_buff *skb = rx->skb;
1714         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1715         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1716         int i;
1717
1718         if (!sta || !link_sta)
1719                 return RX_CONTINUE;
1720
1721         /*
1722          * Update last_rx only for IBSS packets which are for the current
1723          * BSSID and for station already AUTHORIZED to avoid keeping the
1724          * current IBSS network alive in cases where other STAs start
1725          * using different BSSID. This will also give the station another
1726          * chance to restart the authentication/authorization in case
1727          * something went wrong the first time.
1728          */
1729         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1730                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1731                                                 NL80211_IFTYPE_ADHOC);
1732                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1733                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1734                         link_sta->rx_stats.last_rx = jiffies;
1735                         if (ieee80211_is_data(hdr->frame_control) &&
1736                             !is_multicast_ether_addr(hdr->addr1))
1737                                 link_sta->rx_stats.last_rate =
1738                                         sta_stats_encode_rate(status);
1739                 }
1740         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1741                 link_sta->rx_stats.last_rx = jiffies;
1742         } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1743                    !is_multicast_ether_addr(hdr->addr1)) {
1744                 /*
1745                  * Mesh beacons will update last_rx when if they are found to
1746                  * match the current local configuration when processed.
1747                  */
1748                 link_sta->rx_stats.last_rx = jiffies;
1749                 if (ieee80211_is_data(hdr->frame_control))
1750                         link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1751         }
1752
1753         link_sta->rx_stats.fragments++;
1754
1755         u64_stats_update_begin(&link_sta->rx_stats.syncp);
1756         link_sta->rx_stats.bytes += rx->skb->len;
1757         u64_stats_update_end(&link_sta->rx_stats.syncp);
1758
1759         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1760                 link_sta->rx_stats.last_signal = status->signal;
1761                 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1762                                 -status->signal);
1763         }
1764
1765         if (status->chains) {
1766                 link_sta->rx_stats.chains = status->chains;
1767                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1768                         int signal = status->chain_signal[i];
1769
1770                         if (!(status->chains & BIT(i)))
1771                                 continue;
1772
1773                         link_sta->rx_stats.chain_signal_last[i] = signal;
1774                         ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1775                                         -signal);
1776                 }
1777         }
1778
1779         if (ieee80211_is_s1g_beacon(hdr->frame_control))
1780                 return RX_CONTINUE;
1781
1782         /*
1783          * Change STA power saving mode only at the end of a frame
1784          * exchange sequence, and only for a data or management
1785          * frame as specified in IEEE 802.11-2016 11.2.3.2
1786          */
1787         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1788             !ieee80211_has_morefrags(hdr->frame_control) &&
1789             !is_multicast_ether_addr(hdr->addr1) &&
1790             (ieee80211_is_mgmt(hdr->frame_control) ||
1791              ieee80211_is_data(hdr->frame_control)) &&
1792             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1793             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1794              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1795                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1796                         if (!ieee80211_has_pm(hdr->frame_control))
1797                                 sta_ps_end(sta);
1798                 } else {
1799                         if (ieee80211_has_pm(hdr->frame_control))
1800                                 sta_ps_start(sta);
1801                 }
1802         }
1803
1804         /* mesh power save support */
1805         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1806                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1807
1808         /*
1809          * Drop (qos-)data::nullfunc frames silently, since they
1810          * are used only to control station power saving mode.
1811          */
1812         if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1813                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1814
1815                 /*
1816                  * If we receive a 4-addr nullfunc frame from a STA
1817                  * that was not moved to a 4-addr STA vlan yet send
1818                  * the event to userspace and for older hostapd drop
1819                  * the frame to the monitor interface.
1820                  */
1821                 if (ieee80211_has_a4(hdr->frame_control) &&
1822                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1823                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1824                       !rx->sdata->u.vlan.sta))) {
1825                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1826                                 cfg80211_rx_unexpected_4addr_frame(
1827                                         rx->sdata->dev, sta->sta.addr,
1828                                         GFP_ATOMIC);
1829                         return RX_DROP_M_UNEXPECTED_4ADDR_FRAME;
1830                 }
1831                 /*
1832                  * Update counter and free packet here to avoid
1833                  * counting this as a dropped packed.
1834                  */
1835                 link_sta->rx_stats.packets++;
1836                 dev_kfree_skb(rx->skb);
1837                 return RX_QUEUED;
1838         }
1839
1840         return RX_CONTINUE;
1841 } /* ieee80211_rx_h_sta_process */
1842
1843 static struct ieee80211_key *
1844 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1845 {
1846         struct ieee80211_key *key = NULL;
1847         int idx2;
1848
1849         /* Make sure key gets set if either BIGTK key index is set so that
1850          * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1851          * Beacon frames and Beacon frames that claim to use another BIGTK key
1852          * index (i.e., a key that we do not have).
1853          */
1854
1855         if (idx < 0) {
1856                 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1857                 idx2 = idx + 1;
1858         } else {
1859                 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1860                         idx2 = idx + 1;
1861                 else
1862                         idx2 = idx - 1;
1863         }
1864
1865         if (rx->link_sta)
1866                 key = rcu_dereference(rx->link_sta->gtk[idx]);
1867         if (!key)
1868                 key = rcu_dereference(rx->link->gtk[idx]);
1869         if (!key && rx->link_sta)
1870                 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1871         if (!key)
1872                 key = rcu_dereference(rx->link->gtk[idx2]);
1873
1874         return key;
1875 }
1876
1877 static ieee80211_rx_result debug_noinline
1878 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1879 {
1880         struct sk_buff *skb = rx->skb;
1881         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1882         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1883         int keyidx;
1884         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1885         struct ieee80211_key *sta_ptk = NULL;
1886         struct ieee80211_key *ptk_idx = NULL;
1887         int mmie_keyidx = -1;
1888         __le16 fc;
1889
1890         if (ieee80211_is_ext(hdr->frame_control))
1891                 return RX_CONTINUE;
1892
1893         /*
1894          * Key selection 101
1895          *
1896          * There are five types of keys:
1897          *  - GTK (group keys)
1898          *  - IGTK (group keys for management frames)
1899          *  - BIGTK (group keys for Beacon frames)
1900          *  - PTK (pairwise keys)
1901          *  - STK (station-to-station pairwise keys)
1902          *
1903          * When selecting a key, we have to distinguish between multicast
1904          * (including broadcast) and unicast frames, the latter can only
1905          * use PTKs and STKs while the former always use GTKs, IGTKs, and
1906          * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1907          * then unicast frames can also use key indices like GTKs. Hence, if we
1908          * don't have a PTK/STK we check the key index for a WEP key.
1909          *
1910          * Note that in a regular BSS, multicast frames are sent by the
1911          * AP only, associated stations unicast the frame to the AP first
1912          * which then multicasts it on their behalf.
1913          *
1914          * There is also a slight problem in IBSS mode: GTKs are negotiated
1915          * with each station, that is something we don't currently handle.
1916          * The spec seems to expect that one negotiates the same key with
1917          * every station but there's no such requirement; VLANs could be
1918          * possible.
1919          */
1920
1921         /* start without a key */
1922         rx->key = NULL;
1923         fc = hdr->frame_control;
1924
1925         if (rx->sta) {
1926                 int keyid = rx->sta->ptk_idx;
1927                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1928
1929                 if (ieee80211_has_protected(fc) &&
1930                     !(status->flag & RX_FLAG_IV_STRIPPED)) {
1931                         keyid = ieee80211_get_keyid(rx->skb);
1932
1933                         if (unlikely(keyid < 0))
1934                                 return RX_DROP_UNUSABLE;
1935
1936                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1937                 }
1938         }
1939
1940         if (!ieee80211_has_protected(fc))
1941                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1942
1943         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1944                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1945                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1946                     (status->flag & RX_FLAG_IV_STRIPPED))
1947                         return RX_CONTINUE;
1948                 /* Skip decryption if the frame is not protected. */
1949                 if (!ieee80211_has_protected(fc))
1950                         return RX_CONTINUE;
1951         } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1952                 /* Broadcast/multicast robust management frame / BIP */
1953                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1954                     (status->flag & RX_FLAG_IV_STRIPPED))
1955                         return RX_CONTINUE;
1956
1957                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1958                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1959                                    NUM_DEFAULT_BEACON_KEYS) {
1960                         if (rx->sdata->dev)
1961                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1962                                                              skb->data,
1963                                                              skb->len);
1964                         return RX_DROP_M_BAD_BCN_KEYIDX;
1965                 }
1966
1967                 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1968                 if (!rx->key)
1969                         return RX_CONTINUE; /* Beacon protection not in use */
1970         } else if (mmie_keyidx >= 0) {
1971                 /* Broadcast/multicast robust management frame / BIP */
1972                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1973                     (status->flag & RX_FLAG_IV_STRIPPED))
1974                         return RX_CONTINUE;
1975
1976                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1977                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1978                         return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
1979                 if (rx->link_sta) {
1980                         if (ieee80211_is_group_privacy_action(skb) &&
1981                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1982                                 return RX_DROP_MONITOR;
1983
1984                         rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
1985                 }
1986                 if (!rx->key)
1987                         rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
1988         } else if (!ieee80211_has_protected(fc)) {
1989                 /*
1990                  * The frame was not protected, so skip decryption. However, we
1991                  * need to set rx->key if there is a key that could have been
1992                  * used so that the frame may be dropped if encryption would
1993                  * have been expected.
1994                  */
1995                 struct ieee80211_key *key = NULL;
1996                 int i;
1997
1998                 if (ieee80211_is_beacon(fc)) {
1999                         key = ieee80211_rx_get_bigtk(rx, -1);
2000                 } else if (ieee80211_is_mgmt(fc) &&
2001                            is_multicast_ether_addr(hdr->addr1)) {
2002                         key = rcu_dereference(rx->link->default_mgmt_key);
2003                 } else {
2004                         if (rx->link_sta) {
2005                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2006                                         key = rcu_dereference(rx->link_sta->gtk[i]);
2007                                         if (key)
2008                                                 break;
2009                                 }
2010                         }
2011                         if (!key) {
2012                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2013                                         key = rcu_dereference(rx->link->gtk[i]);
2014                                         if (key)
2015                                                 break;
2016                                 }
2017                         }
2018                 }
2019                 if (key)
2020                         rx->key = key;
2021                 return RX_CONTINUE;
2022         } else {
2023                 /*
2024                  * The device doesn't give us the IV so we won't be
2025                  * able to look up the key. That's ok though, we
2026                  * don't need to decrypt the frame, we just won't
2027                  * be able to keep statistics accurate.
2028                  * Except for key threshold notifications, should
2029                  * we somehow allow the driver to tell us which key
2030                  * the hardware used if this flag is set?
2031                  */
2032                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2033                     (status->flag & RX_FLAG_IV_STRIPPED))
2034                         return RX_CONTINUE;
2035
2036                 keyidx = ieee80211_get_keyid(rx->skb);
2037
2038                 if (unlikely(keyidx < 0))
2039                         return RX_DROP_UNUSABLE;
2040
2041                 /* check per-station GTK first, if multicast packet */
2042                 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2043                         rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2044
2045                 /* if not found, try default key */
2046                 if (!rx->key) {
2047                         if (is_multicast_ether_addr(hdr->addr1))
2048                                 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2049                         if (!rx->key)
2050                                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2051
2052                         /*
2053                          * RSNA-protected unicast frames should always be
2054                          * sent with pairwise or station-to-station keys,
2055                          * but for WEP we allow using a key index as well.
2056                          */
2057                         if (rx->key &&
2058                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2059                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2060                             !is_multicast_ether_addr(hdr->addr1))
2061                                 rx->key = NULL;
2062                 }
2063         }
2064
2065         if (rx->key) {
2066                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2067                         return RX_DROP_MONITOR;
2068
2069                 /* TODO: add threshold stuff again */
2070         } else {
2071                 return RX_DROP_MONITOR;
2072         }
2073
2074         switch (rx->key->conf.cipher) {
2075         case WLAN_CIPHER_SUITE_WEP40:
2076         case WLAN_CIPHER_SUITE_WEP104:
2077                 result = ieee80211_crypto_wep_decrypt(rx);
2078                 break;
2079         case WLAN_CIPHER_SUITE_TKIP:
2080                 result = ieee80211_crypto_tkip_decrypt(rx);
2081                 break;
2082         case WLAN_CIPHER_SUITE_CCMP:
2083                 result = ieee80211_crypto_ccmp_decrypt(
2084                         rx, IEEE80211_CCMP_MIC_LEN);
2085                 break;
2086         case WLAN_CIPHER_SUITE_CCMP_256:
2087                 result = ieee80211_crypto_ccmp_decrypt(
2088                         rx, IEEE80211_CCMP_256_MIC_LEN);
2089                 break;
2090         case WLAN_CIPHER_SUITE_AES_CMAC:
2091                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2092                 break;
2093         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2094                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2095                 break;
2096         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2097         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2098                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2099                 break;
2100         case WLAN_CIPHER_SUITE_GCMP:
2101         case WLAN_CIPHER_SUITE_GCMP_256:
2102                 result = ieee80211_crypto_gcmp_decrypt(rx);
2103                 break;
2104         default:
2105                 result = RX_DROP_UNUSABLE;
2106         }
2107
2108         /* the hdr variable is invalid after the decrypt handlers */
2109
2110         /* either the frame has been decrypted or will be dropped */
2111         status->flag |= RX_FLAG_DECRYPTED;
2112
2113         if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
2114                      rx->sdata->dev))
2115                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2116                                              skb->data, skb->len);
2117
2118         return result;
2119 }
2120
2121 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2122 {
2123         int i;
2124
2125         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2126                 skb_queue_head_init(&cache->entries[i].skb_list);
2127 }
2128
2129 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2130 {
2131         int i;
2132
2133         for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2134                 __skb_queue_purge(&cache->entries[i].skb_list);
2135 }
2136
2137 static inline struct ieee80211_fragment_entry *
2138 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2139                          unsigned int frag, unsigned int seq, int rx_queue,
2140                          struct sk_buff **skb)
2141 {
2142         struct ieee80211_fragment_entry *entry;
2143
2144         entry = &cache->entries[cache->next++];
2145         if (cache->next >= IEEE80211_FRAGMENT_MAX)
2146                 cache->next = 0;
2147
2148         __skb_queue_purge(&entry->skb_list);
2149
2150         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2151         *skb = NULL;
2152         entry->first_frag_time = jiffies;
2153         entry->seq = seq;
2154         entry->rx_queue = rx_queue;
2155         entry->last_frag = frag;
2156         entry->check_sequential_pn = false;
2157         entry->extra_len = 0;
2158
2159         return entry;
2160 }
2161
2162 static inline struct ieee80211_fragment_entry *
2163 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2164                           unsigned int frag, unsigned int seq,
2165                           int rx_queue, struct ieee80211_hdr *hdr)
2166 {
2167         struct ieee80211_fragment_entry *entry;
2168         int i, idx;
2169
2170         idx = cache->next;
2171         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2172                 struct ieee80211_hdr *f_hdr;
2173                 struct sk_buff *f_skb;
2174
2175                 idx--;
2176                 if (idx < 0)
2177                         idx = IEEE80211_FRAGMENT_MAX - 1;
2178
2179                 entry = &cache->entries[idx];
2180                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2181                     entry->rx_queue != rx_queue ||
2182                     entry->last_frag + 1 != frag)
2183                         continue;
2184
2185                 f_skb = __skb_peek(&entry->skb_list);
2186                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2187
2188                 /*
2189                  * Check ftype and addresses are equal, else check next fragment
2190                  */
2191                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2192                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2193                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2194                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2195                         continue;
2196
2197                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2198                         __skb_queue_purge(&entry->skb_list);
2199                         continue;
2200                 }
2201                 return entry;
2202         }
2203
2204         return NULL;
2205 }
2206
2207 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2208 {
2209         return rx->key &&
2210                 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2211                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2212                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2213                  rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2214                 ieee80211_has_protected(fc);
2215 }
2216
2217 static ieee80211_rx_result debug_noinline
2218 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2219 {
2220         struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2221         struct ieee80211_hdr *hdr;
2222         u16 sc;
2223         __le16 fc;
2224         unsigned int frag, seq;
2225         struct ieee80211_fragment_entry *entry;
2226         struct sk_buff *skb;
2227         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2228
2229         hdr = (struct ieee80211_hdr *)rx->skb->data;
2230         fc = hdr->frame_control;
2231
2232         if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2233                 return RX_CONTINUE;
2234
2235         sc = le16_to_cpu(hdr->seq_ctrl);
2236         frag = sc & IEEE80211_SCTL_FRAG;
2237
2238         if (rx->sta)
2239                 cache = &rx->sta->frags;
2240
2241         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2242                 goto out;
2243
2244         if (is_multicast_ether_addr(hdr->addr1))
2245                 return RX_DROP_MONITOR;
2246
2247         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2248
2249         if (skb_linearize(rx->skb))
2250                 return RX_DROP_UNUSABLE;
2251
2252         /*
2253          *  skb_linearize() might change the skb->data and
2254          *  previously cached variables (in this case, hdr) need to
2255          *  be refreshed with the new data.
2256          */
2257         hdr = (struct ieee80211_hdr *)rx->skb->data;
2258         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2259
2260         if (frag == 0) {
2261                 /* This is the first fragment of a new frame. */
2262                 entry = ieee80211_reassemble_add(cache, frag, seq,
2263                                                  rx->seqno_idx, &(rx->skb));
2264                 if (requires_sequential_pn(rx, fc)) {
2265                         int queue = rx->security_idx;
2266
2267                         /* Store CCMP/GCMP PN so that we can verify that the
2268                          * next fragment has a sequential PN value.
2269                          */
2270                         entry->check_sequential_pn = true;
2271                         entry->is_protected = true;
2272                         entry->key_color = rx->key->color;
2273                         memcpy(entry->last_pn,
2274                                rx->key->u.ccmp.rx_pn[queue],
2275                                IEEE80211_CCMP_PN_LEN);
2276                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2277                                               u.ccmp.rx_pn) !=
2278                                      offsetof(struct ieee80211_key,
2279                                               u.gcmp.rx_pn));
2280                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2281                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2282                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2283                                      IEEE80211_GCMP_PN_LEN);
2284                 } else if (rx->key &&
2285                            (ieee80211_has_protected(fc) ||
2286                             (status->flag & RX_FLAG_DECRYPTED))) {
2287                         entry->is_protected = true;
2288                         entry->key_color = rx->key->color;
2289                 }
2290                 return RX_QUEUED;
2291         }
2292
2293         /* This is a fragment for a frame that should already be pending in
2294          * fragment cache. Add this fragment to the end of the pending entry.
2295          */
2296         entry = ieee80211_reassemble_find(cache, frag, seq,
2297                                           rx->seqno_idx, hdr);
2298         if (!entry) {
2299                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2300                 return RX_DROP_MONITOR;
2301         }
2302
2303         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2304          *  MPDU PN values are not incrementing in steps of 1."
2305          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2306          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2307          */
2308         if (entry->check_sequential_pn) {
2309                 int i;
2310                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2311
2312                 if (!requires_sequential_pn(rx, fc))
2313                         return RX_DROP_UNUSABLE;
2314
2315                 /* Prevent mixed key and fragment cache attacks */
2316                 if (entry->key_color != rx->key->color)
2317                         return RX_DROP_UNUSABLE;
2318
2319                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2320                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2321                         pn[i]++;
2322                         if (pn[i])
2323                                 break;
2324                 }
2325
2326                 rpn = rx->ccm_gcm.pn;
2327                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2328                         return RX_DROP_UNUSABLE;
2329                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2330         } else if (entry->is_protected &&
2331                    (!rx->key ||
2332                     (!ieee80211_has_protected(fc) &&
2333                      !(status->flag & RX_FLAG_DECRYPTED)) ||
2334                     rx->key->color != entry->key_color)) {
2335                 /* Drop this as a mixed key or fragment cache attack, even
2336                  * if for TKIP Michael MIC should protect us, and WEP is a
2337                  * lost cause anyway.
2338                  */
2339                 return RX_DROP_UNUSABLE;
2340         } else if (entry->is_protected && rx->key &&
2341                    entry->key_color != rx->key->color &&
2342                    (status->flag & RX_FLAG_DECRYPTED)) {
2343                 return RX_DROP_UNUSABLE;
2344         }
2345
2346         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2347         __skb_queue_tail(&entry->skb_list, rx->skb);
2348         entry->last_frag = frag;
2349         entry->extra_len += rx->skb->len;
2350         if (ieee80211_has_morefrags(fc)) {
2351                 rx->skb = NULL;
2352                 return RX_QUEUED;
2353         }
2354
2355         rx->skb = __skb_dequeue(&entry->skb_list);
2356         if (skb_tailroom(rx->skb) < entry->extra_len) {
2357                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2358                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2359                                               GFP_ATOMIC))) {
2360                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2361                         __skb_queue_purge(&entry->skb_list);
2362                         return RX_DROP_UNUSABLE;
2363                 }
2364         }
2365         while ((skb = __skb_dequeue(&entry->skb_list))) {
2366                 skb_put_data(rx->skb, skb->data, skb->len);
2367                 dev_kfree_skb(skb);
2368         }
2369
2370  out:
2371         ieee80211_led_rx(rx->local);
2372         if (rx->sta)
2373                 rx->link_sta->rx_stats.packets++;
2374         return RX_CONTINUE;
2375 }
2376
2377 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2378 {
2379         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2380                 return -EACCES;
2381
2382         return 0;
2383 }
2384
2385 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2386 {
2387         struct sk_buff *skb = rx->skb;
2388         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2389
2390         /*
2391          * Pass through unencrypted frames if the hardware has
2392          * decrypted them already.
2393          */
2394         if (status->flag & RX_FLAG_DECRYPTED)
2395                 return 0;
2396
2397         /* Drop unencrypted frames if key is set. */
2398         if (unlikely(!ieee80211_has_protected(fc) &&
2399                      !ieee80211_is_any_nullfunc(fc) &&
2400                      ieee80211_is_data(fc) && rx->key))
2401                 return -EACCES;
2402
2403         return 0;
2404 }
2405
2406 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2407 {
2408         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2409         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2410         __le16 fc = hdr->frame_control;
2411
2412         /*
2413          * Pass through unencrypted frames if the hardware has
2414          * decrypted them already.
2415          */
2416         if (status->flag & RX_FLAG_DECRYPTED)
2417                 return 0;
2418
2419         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2420                 if (unlikely(!ieee80211_has_protected(fc) &&
2421                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2422                              rx->key)) {
2423                         if (ieee80211_is_deauth(fc) ||
2424                             ieee80211_is_disassoc(fc))
2425                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2426                                                              rx->skb->data,
2427                                                              rx->skb->len);
2428                         return -EACCES;
2429                 }
2430                 /* BIP does not use Protected field, so need to check MMIE */
2431                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2432                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2433                         if (ieee80211_is_deauth(fc) ||
2434                             ieee80211_is_disassoc(fc))
2435                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2436                                                              rx->skb->data,
2437                                                              rx->skb->len);
2438                         return -EACCES;
2439                 }
2440                 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2441                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2442                         cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2443                                                      rx->skb->data,
2444                                                      rx->skb->len);
2445                         return -EACCES;
2446                 }
2447                 /*
2448                  * When using MFP, Action frames are not allowed prior to
2449                  * having configured keys.
2450                  */
2451                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2452                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2453                         return -EACCES;
2454         }
2455
2456         return 0;
2457 }
2458
2459 static int
2460 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2461 {
2462         struct ieee80211_sub_if_data *sdata = rx->sdata;
2463         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2464         bool check_port_control = false;
2465         struct ethhdr *ehdr;
2466         int ret;
2467
2468         *port_control = false;
2469         if (ieee80211_has_a4(hdr->frame_control) &&
2470             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2471                 return -1;
2472
2473         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2474             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2475
2476                 if (!sdata->u.mgd.use_4addr)
2477                         return -1;
2478                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2479                         check_port_control = true;
2480         }
2481
2482         if (is_multicast_ether_addr(hdr->addr1) &&
2483             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2484                 return -1;
2485
2486         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2487         if (ret < 0)
2488                 return ret;
2489
2490         ehdr = (struct ethhdr *) rx->skb->data;
2491         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2492                 *port_control = true;
2493         else if (check_port_control)
2494                 return -1;
2495
2496         return 0;
2497 }
2498
2499 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2500                            const u8 *addr, int *out_link_id)
2501 {
2502         unsigned int link_id;
2503
2504         /* non-MLO, or MLD address replaced by hardware */
2505         if (ether_addr_equal(sdata->vif.addr, addr))
2506                 return true;
2507
2508         if (!sdata->vif.valid_links)
2509                 return false;
2510
2511         for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2512                 struct ieee80211_bss_conf *conf;
2513
2514                 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2515
2516                 if (!conf)
2517                         continue;
2518                 if (ether_addr_equal(conf->addr, addr)) {
2519                         if (out_link_id)
2520                                 *out_link_id = link_id;
2521                         return true;
2522                 }
2523         }
2524
2525         return false;
2526 }
2527
2528 /*
2529  * requires that rx->skb is a frame with ethernet header
2530  */
2531 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2532 {
2533         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2534                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2535         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2536
2537         /*
2538          * Allow EAPOL frames to us/the PAE group address regardless of
2539          * whether the frame was encrypted or not, and always disallow
2540          * all other destination addresses for them.
2541          */
2542         if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2543                 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
2544                        ether_addr_equal(ehdr->h_dest, pae_group_addr);
2545
2546         if (ieee80211_802_1x_port_control(rx) ||
2547             ieee80211_drop_unencrypted(rx, fc))
2548                 return false;
2549
2550         return true;
2551 }
2552
2553 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2554                                                  struct ieee80211_rx_data *rx)
2555 {
2556         struct ieee80211_sub_if_data *sdata = rx->sdata;
2557         struct net_device *dev = sdata->dev;
2558
2559         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2560                      (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2561                       !sdata->control_port_no_preauth)) &&
2562                      sdata->control_port_over_nl80211)) {
2563                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2564                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2565
2566                 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id);
2567                 dev_kfree_skb(skb);
2568         } else {
2569                 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2570
2571                 memset(skb->cb, 0, sizeof(skb->cb));
2572
2573                 /*
2574                  * 802.1X over 802.11 requires that the authenticator address
2575                  * be used for EAPOL frames. However, 802.1X allows the use of
2576                  * the PAE group address instead. If the interface is part of
2577                  * a bridge and we pass the frame with the PAE group address,
2578                  * then the bridge will forward it to the network (even if the
2579                  * client was not associated yet), which isn't supposed to
2580                  * happen.
2581                  * To avoid that, rewrite the destination address to our own
2582                  * address, so that the authenticator (e.g. hostapd) will see
2583                  * the frame, but bridge won't forward it anywhere else. Note
2584                  * that due to earlier filtering, the only other address can
2585                  * be the PAE group address, unless the hardware allowed them
2586                  * through in 802.3 offloaded mode.
2587                  */
2588                 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2589                              !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2590                         ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2591
2592                 /* deliver to local stack */
2593                 if (rx->list)
2594                         list_add_tail(&skb->list, rx->list);
2595                 else
2596                         netif_receive_skb(skb);
2597         }
2598 }
2599
2600 /*
2601  * requires that rx->skb is a frame with ethernet header
2602  */
2603 static void
2604 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2605 {
2606         struct ieee80211_sub_if_data *sdata = rx->sdata;
2607         struct net_device *dev = sdata->dev;
2608         struct sk_buff *skb, *xmit_skb;
2609         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2610         struct sta_info *dsta;
2611
2612         skb = rx->skb;
2613         xmit_skb = NULL;
2614
2615         dev_sw_netstats_rx_add(dev, skb->len);
2616
2617         if (rx->sta) {
2618                 /* The seqno index has the same property as needed
2619                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2620                  * for non-QoS-data frames. Here we know it's a data
2621                  * frame, so count MSDUs.
2622                  */
2623                 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
2624                 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2625                 u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
2626         }
2627
2628         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2629              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2630             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2631             ehdr->h_proto != rx->sdata->control_port_protocol &&
2632             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2633                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2634                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2635                         /*
2636                          * send multicast frames both to higher layers in
2637                          * local net stack and back to the wireless medium
2638                          */
2639                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2640                         if (!xmit_skb)
2641                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2642                                                     dev->name);
2643                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2644                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2645                         dsta = sta_info_get(sdata, ehdr->h_dest);
2646                         if (dsta) {
2647                                 /*
2648                                  * The destination station is associated to
2649                                  * this AP (in this VLAN), so send the frame
2650                                  * directly to it and do not pass it to local
2651                                  * net stack.
2652                                  */
2653                                 xmit_skb = skb;
2654                                 skb = NULL;
2655                         }
2656                 }
2657         }
2658
2659 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2660         if (skb) {
2661                 /* 'align' will only take the values 0 or 2 here since all
2662                  * frames are required to be aligned to 2-byte boundaries
2663                  * when being passed to mac80211; the code here works just
2664                  * as well if that isn't true, but mac80211 assumes it can
2665                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2666                  */
2667                 int align;
2668
2669                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2670                 if (align) {
2671                         if (WARN_ON(skb_headroom(skb) < 3)) {
2672                                 dev_kfree_skb(skb);
2673                                 skb = NULL;
2674                         } else {
2675                                 u8 *data = skb->data;
2676                                 size_t len = skb_headlen(skb);
2677                                 skb->data -= align;
2678                                 memmove(skb->data, data, len);
2679                                 skb_set_tail_pointer(skb, len);
2680                         }
2681                 }
2682         }
2683 #endif
2684
2685         if (skb) {
2686                 skb->protocol = eth_type_trans(skb, dev);
2687                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2688         }
2689
2690         if (xmit_skb) {
2691                 /*
2692                  * Send to wireless media and increase priority by 256 to
2693                  * keep the received priority instead of reclassifying
2694                  * the frame (see cfg80211_classify8021d).
2695                  */
2696                 xmit_skb->priority += 256;
2697                 xmit_skb->protocol = htons(ETH_P_802_3);
2698                 skb_reset_network_header(xmit_skb);
2699                 skb_reset_mac_header(xmit_skb);
2700                 dev_queue_xmit(xmit_skb);
2701         }
2702 }
2703
2704 #ifdef CONFIG_MAC80211_MESH
2705 static bool
2706 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
2707                                struct sk_buff *skb, int hdrlen)
2708 {
2709         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2710         struct ieee80211_mesh_fast_tx *entry = NULL;
2711         struct ieee80211s_hdr *mesh_hdr;
2712         struct tid_ampdu_tx *tid_tx;
2713         struct sta_info *sta;
2714         struct ethhdr eth;
2715         u8 tid;
2716
2717         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
2718         if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2719                 entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
2720         else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
2721                 entry = mesh_fast_tx_get(sdata, skb->data);
2722         if (!entry)
2723                 return false;
2724
2725         sta = rcu_dereference(entry->mpath->next_hop);
2726         if (!sta)
2727                 return false;
2728
2729         if (skb_linearize(skb))
2730                 return false;
2731
2732         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2733         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2734         if (tid_tx) {
2735                 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2736                         return false;
2737
2738                 if (tid_tx->timeout)
2739                         tid_tx->last_tx = jiffies;
2740         }
2741
2742         ieee80211_aggr_check(sdata, sta, skb);
2743
2744         if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
2745                                             &skb->protocol))
2746                 hdrlen += ETH_ALEN;
2747         else
2748                 skb->protocol = htons(skb->len - hdrlen);
2749         skb_set_network_header(skb, hdrlen + 2);
2750
2751         skb->dev = sdata->dev;
2752         memcpy(&eth, skb->data, ETH_HLEN - 2);
2753         skb_pull(skb, 2);
2754         __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
2755                               eth.h_dest, eth.h_source);
2756         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2757         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2758
2759         return true;
2760 }
2761 #endif
2762
2763 static ieee80211_rx_result
2764 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
2765                        struct sk_buff *skb)
2766 {
2767 #ifdef CONFIG_MAC80211_MESH
2768         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2769         struct ieee80211_local *local = sdata->local;
2770         uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
2771         struct ieee80211_hdr hdr = {
2772                 .frame_control = cpu_to_le16(fc)
2773         };
2774         struct ieee80211_hdr *fwd_hdr;
2775         struct ieee80211s_hdr *mesh_hdr;
2776         struct ieee80211_tx_info *info;
2777         struct sk_buff *fwd_skb;
2778         struct ethhdr *eth;
2779         bool multicast;
2780         int tailroom = 0;
2781         int hdrlen, mesh_hdrlen;
2782         u8 *qos;
2783
2784         if (!ieee80211_vif_is_mesh(&sdata->vif))
2785                 return RX_CONTINUE;
2786
2787         if (!pskb_may_pull(skb, sizeof(*eth) + 6))
2788                 return RX_DROP_MONITOR;
2789
2790         mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
2791         mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);
2792
2793         if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
2794                 return RX_DROP_MONITOR;
2795
2796         eth = (struct ethhdr *)skb->data;
2797         multicast = is_multicast_ether_addr(eth->h_dest);
2798
2799         mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
2800         if (!mesh_hdr->ttl)
2801                 return RX_DROP_MONITOR;
2802
2803         /* frame is in RMC, don't forward */
2804         if (is_multicast_ether_addr(eth->h_dest) &&
2805             mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
2806                 return RX_DROP_MONITOR;
2807
2808         /* forward packet */
2809         if (sdata->crypto_tx_tailroom_needed_cnt)
2810                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2811
2812         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2813                 struct mesh_path *mppath;
2814                 char *proxied_addr;
2815                 bool update = false;
2816
2817                 if (multicast)
2818                         proxied_addr = mesh_hdr->eaddr1;
2819                 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2820                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2821                         proxied_addr = mesh_hdr->eaddr2;
2822                 else
2823                         return RX_DROP_MONITOR;
2824
2825                 rcu_read_lock();
2826                 mppath = mpp_path_lookup(sdata, proxied_addr);
2827                 if (!mppath) {
2828                         mpp_path_add(sdata, proxied_addr, eth->h_source);
2829                 } else {
2830                         spin_lock_bh(&mppath->state_lock);
2831                         if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
2832                                 memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
2833                                 update = true;
2834                         }
2835                         mppath->exp_time = jiffies;
2836                         spin_unlock_bh(&mppath->state_lock);
2837                 }
2838
2839                 /* flush fast xmit cache if the address path changed */
2840                 if (update)
2841                         mesh_fast_tx_flush_addr(sdata, proxied_addr);
2842
2843                 rcu_read_unlock();
2844         }
2845
2846         /* Frame has reached destination.  Don't forward */
2847         if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
2848                 goto rx_accept;
2849
2850         if (!--mesh_hdr->ttl) {
2851                 if (multicast)
2852                         goto rx_accept;
2853
2854                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2855                 return RX_DROP_MONITOR;
2856         }
2857
2858         if (!ifmsh->mshcfg.dot11MeshForwarding) {
2859                 if (is_multicast_ether_addr(eth->h_dest))
2860                         goto rx_accept;
2861
2862                 return RX_DROP_MONITOR;
2863         }
2864
2865         skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
2866
2867         if (!multicast &&
2868             ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
2869                 return RX_QUEUED;
2870
2871         ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
2872                                       eth->h_dest, eth->h_source);
2873         hdrlen = ieee80211_hdrlen(hdr.frame_control);
2874         if (multicast) {
2875                 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
2876
2877                 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
2878                                                IEEE80211_ENCRYPT_HEADROOM,
2879                                           tailroom, GFP_ATOMIC);
2880                 if (!fwd_skb)
2881                         goto rx_accept;
2882         } else {
2883                 fwd_skb = skb;
2884                 skb = NULL;
2885
2886                 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
2887                         return RX_DROP_UNUSABLE;
2888
2889                 if (skb_linearize(fwd_skb))
2890                         return RX_DROP_UNUSABLE;
2891         }
2892
2893         fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
2894         memcpy(fwd_hdr, &hdr, hdrlen - 2);
2895         qos = ieee80211_get_qos_ctl(fwd_hdr);
2896         qos[0] = qos[1] = 0;
2897
2898         skb_reset_mac_header(fwd_skb);
2899         hdrlen += mesh_hdrlen;
2900         if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
2901                                             &fwd_skb->protocol))
2902                 hdrlen += ETH_ALEN;
2903         else
2904                 fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
2905         skb_set_network_header(fwd_skb, hdrlen + 2);
2906
2907         info = IEEE80211_SKB_CB(fwd_skb);
2908         memset(info, 0, sizeof(*info));
2909         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2910         info->control.vif = &sdata->vif;
2911         info->control.jiffies = jiffies;
2912         fwd_skb->dev = sdata->dev;
2913         if (multicast) {
2914                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2915                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2916                 /* update power mode indication when forwarding */
2917                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2918         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2919                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2920                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2921         } else {
2922                 /* unable to resolve next hop */
2923                 if (sta)
2924                         mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2925                                            hdr.addr3, 0,
2926                                            WLAN_REASON_MESH_PATH_NOFORWARD,
2927                                            sta->sta.addr);
2928                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2929                 kfree_skb(fwd_skb);
2930                 goto rx_accept;
2931         }
2932
2933         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2934         ieee80211_add_pending_skb(local, fwd_skb);
2935
2936 rx_accept:
2937         if (!skb)
2938                 return RX_QUEUED;
2939
2940         ieee80211_strip_8023_mesh_hdr(skb);
2941 #endif
2942
2943         return RX_CONTINUE;
2944 }
2945
2946 static ieee80211_rx_result debug_noinline
2947 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2948 {
2949         struct net_device *dev = rx->sdata->dev;
2950         struct sk_buff *skb = rx->skb;
2951         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2952         __le16 fc = hdr->frame_control;
2953         struct sk_buff_head frame_list;
2954         ieee80211_rx_result res;
2955         struct ethhdr ethhdr;
2956         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2957
2958         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2959                 check_da = NULL;
2960                 check_sa = NULL;
2961         } else switch (rx->sdata->vif.type) {
2962                 case NL80211_IFTYPE_AP:
2963                 case NL80211_IFTYPE_AP_VLAN:
2964                         check_da = NULL;
2965                         break;
2966                 case NL80211_IFTYPE_STATION:
2967                         if (!rx->sta ||
2968                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2969                                 check_sa = NULL;
2970                         break;
2971                 case NL80211_IFTYPE_MESH_POINT:
2972                         check_sa = NULL;
2973                         check_da = NULL;
2974                         break;
2975                 default:
2976                         break;
2977         }
2978
2979         skb->dev = dev;
2980         __skb_queue_head_init(&frame_list);
2981
2982         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2983                                           rx->sdata->vif.addr,
2984                                           rx->sdata->vif.type,
2985                                           data_offset, true))
2986                 return RX_DROP_UNUSABLE;
2987
2988         if (rx->sta->amsdu_mesh_control < 0) {
2989                 s8 valid = -1;
2990                 int i;
2991
2992                 for (i = 0; i <= 2; i++) {
2993                         if (!ieee80211_is_valid_amsdu(skb, i))
2994                                 continue;
2995
2996                         if (valid >= 0) {
2997                                 /* ambiguous */
2998                                 valid = -1;
2999                                 break;
3000                         }
3001
3002                         valid = i;
3003                 }
3004
3005                 rx->sta->amsdu_mesh_control = valid;
3006         }
3007
3008         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
3009                                  rx->sdata->vif.type,
3010                                  rx->local->hw.extra_tx_headroom,
3011                                  check_da, check_sa,
3012                                  rx->sta->amsdu_mesh_control);
3013
3014         while (!skb_queue_empty(&frame_list)) {
3015                 rx->skb = __skb_dequeue(&frame_list);
3016
3017                 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3018                 switch (res) {
3019                 case RX_QUEUED:
3020                         continue;
3021                 case RX_CONTINUE:
3022                         break;
3023                 default:
3024                         goto free;
3025                 }
3026
3027                 if (!ieee80211_frame_allowed(rx, fc))
3028                         goto free;
3029
3030                 ieee80211_deliver_skb(rx);
3031                 continue;
3032
3033 free:
3034                 dev_kfree_skb(rx->skb);
3035         }
3036
3037         return RX_QUEUED;
3038 }
3039
3040 static ieee80211_rx_result debug_noinline
3041 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
3042 {
3043         struct sk_buff *skb = rx->skb;
3044         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3045         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3046         __le16 fc = hdr->frame_control;
3047
3048         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
3049                 return RX_CONTINUE;
3050
3051         if (unlikely(!ieee80211_is_data(fc)))
3052                 return RX_CONTINUE;
3053
3054         if (unlikely(!ieee80211_is_data_present(fc)))
3055                 return RX_DROP_MONITOR;
3056
3057         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3058                 switch (rx->sdata->vif.type) {
3059                 case NL80211_IFTYPE_AP_VLAN:
3060                         if (!rx->sdata->u.vlan.sta)
3061                                 return RX_DROP_UNUSABLE;
3062                         break;
3063                 case NL80211_IFTYPE_STATION:
3064                         if (!rx->sdata->u.mgd.use_4addr)
3065                                 return RX_DROP_UNUSABLE;
3066                         break;
3067                 case NL80211_IFTYPE_MESH_POINT:
3068                         break;
3069                 default:
3070                         return RX_DROP_UNUSABLE;
3071                 }
3072         }
3073
3074         if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
3075                 return RX_DROP_UNUSABLE;
3076
3077         if (rx->key) {
3078                 /*
3079                  * We should not receive A-MSDUs on pre-HT connections,
3080                  * and HT connections cannot use old ciphers. Thus drop
3081                  * them, as in those cases we couldn't even have SPP
3082                  * A-MSDUs or such.
3083                  */
3084                 switch (rx->key->conf.cipher) {
3085                 case WLAN_CIPHER_SUITE_WEP40:
3086                 case WLAN_CIPHER_SUITE_WEP104:
3087                 case WLAN_CIPHER_SUITE_TKIP:
3088                         return RX_DROP_UNUSABLE;
3089                 default:
3090                         break;
3091                 }
3092         }
3093
3094         return __ieee80211_rx_h_amsdu(rx, 0);
3095 }
3096
3097 static ieee80211_rx_result debug_noinline
3098 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3099 {
3100         struct ieee80211_sub_if_data *sdata = rx->sdata;
3101         struct ieee80211_local *local = rx->local;
3102         struct net_device *dev = sdata->dev;
3103         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3104         __le16 fc = hdr->frame_control;
3105         ieee80211_rx_result res;
3106         bool port_control;
3107         int err;
3108
3109         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3110                 return RX_CONTINUE;
3111
3112         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3113                 return RX_DROP_MONITOR;
3114
3115         /*
3116          * Send unexpected-4addr-frame event to hostapd. For older versions,
3117          * also drop the frame to cooked monitor interfaces.
3118          */
3119         if (ieee80211_has_a4(hdr->frame_control) &&
3120             sdata->vif.type == NL80211_IFTYPE_AP) {
3121                 if (rx->sta &&
3122                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3123                         cfg80211_rx_unexpected_4addr_frame(
3124                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3125                 return RX_DROP_MONITOR;
3126         }
3127
3128         err = __ieee80211_data_to_8023(rx, &port_control);
3129         if (unlikely(err))
3130                 return RX_DROP_UNUSABLE;
3131
3132         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3133         if (res != RX_CONTINUE)
3134                 return res;
3135
3136         if (!ieee80211_frame_allowed(rx, fc))
3137                 return RX_DROP_MONITOR;
3138
3139         /* directly handle TDLS channel switch requests/responses */
3140         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3141                                                 cpu_to_be16(ETH_P_TDLS))) {
3142                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3143
3144                 if (pskb_may_pull(rx->skb,
3145                                   offsetof(struct ieee80211_tdls_data, u)) &&
3146                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3147                     tf->category == WLAN_CATEGORY_TDLS &&
3148                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3149                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3150                         rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3151                         __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3152                                                        rx->sta, rx->skb);
3153                         return RX_QUEUED;
3154                 }
3155         }
3156
3157         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3158             unlikely(port_control) && sdata->bss) {
3159                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3160                                      u.ap);
3161                 dev = sdata->dev;
3162                 rx->sdata = sdata;
3163         }
3164
3165         rx->skb->dev = dev;
3166
3167         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3168             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3169             !is_multicast_ether_addr(
3170                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
3171             (!local->scanning &&
3172              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3173                 mod_timer(&local->dynamic_ps_timer, jiffies +
3174                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3175
3176         ieee80211_deliver_skb(rx);
3177
3178         return RX_QUEUED;
3179 }
3180
3181 static ieee80211_rx_result debug_noinline
3182 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3183 {
3184         struct sk_buff *skb = rx->skb;
3185         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3186         struct tid_ampdu_rx *tid_agg_rx;
3187         u16 start_seq_num;
3188         u16 tid;
3189
3190         if (likely(!ieee80211_is_ctl(bar->frame_control)))
3191                 return RX_CONTINUE;
3192
3193         if (ieee80211_is_back_req(bar->frame_control)) {
3194                 struct {
3195                         __le16 control, start_seq_num;
3196                 } __packed bar_data;
3197                 struct ieee80211_event event = {
3198                         .type = BAR_RX_EVENT,
3199                 };
3200
3201                 if (!rx->sta)
3202                         return RX_DROP_MONITOR;
3203
3204                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3205                                   &bar_data, sizeof(bar_data)))
3206                         return RX_DROP_MONITOR;
3207
3208                 tid = le16_to_cpu(bar_data.control) >> 12;
3209
3210                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3211                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3212                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3213                                              WLAN_BACK_RECIPIENT,
3214                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
3215
3216                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3217                 if (!tid_agg_rx)
3218                         return RX_DROP_MONITOR;
3219
3220                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3221                 event.u.ba.tid = tid;
3222                 event.u.ba.ssn = start_seq_num;
3223                 event.u.ba.sta = &rx->sta->sta;
3224
3225                 /* reset session timer */
3226                 if (tid_agg_rx->timeout)
3227                         mod_timer(&tid_agg_rx->session_timer,
3228                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
3229
3230                 spin_lock(&tid_agg_rx->reorder_lock);
3231                 /* release stored frames up to start of BAR */
3232                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3233                                                  start_seq_num, frames);
3234                 spin_unlock(&tid_agg_rx->reorder_lock);
3235
3236                 drv_event_callback(rx->local, rx->sdata, &event);
3237
3238                 kfree_skb(skb);
3239                 return RX_QUEUED;
3240         }
3241
3242         /*
3243          * After this point, we only want management frames,
3244          * so we can drop all remaining control frames to
3245          * cooked monitor interfaces.
3246          */
3247         return RX_DROP_MONITOR;
3248 }
3249
3250 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3251                                            struct ieee80211_mgmt *mgmt,
3252                                            size_t len)
3253 {
3254         struct ieee80211_local *local = sdata->local;
3255         struct sk_buff *skb;
3256         struct ieee80211_mgmt *resp;
3257
3258         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3259                 /* Not to own unicast address */
3260                 return;
3261         }
3262
3263         if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3264             !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3265                 /* Not from the current AP or not associated yet. */
3266                 return;
3267         }
3268
3269         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3270                 /* Too short SA Query request frame */
3271                 return;
3272         }
3273
3274         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3275         if (skb == NULL)
3276                 return;
3277
3278         skb_reserve(skb, local->hw.extra_tx_headroom);
3279         resp = skb_put_zero(skb, 24);
3280         memcpy(resp->da, mgmt->sa, ETH_ALEN);
3281         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3282         memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3283         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3284                                           IEEE80211_STYPE_ACTION);
3285         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3286         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3287         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3288         memcpy(resp->u.action.u.sa_query.trans_id,
3289                mgmt->u.action.u.sa_query.trans_id,
3290                WLAN_SA_QUERY_TR_ID_LEN);
3291
3292         ieee80211_tx_skb(sdata, skb);
3293 }
3294
3295 static void
3296 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3297 {
3298         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3299         const struct element *ie;
3300         size_t baselen;
3301
3302         if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3303                                      NL80211_EXT_FEATURE_BSS_COLOR))
3304                 return;
3305
3306         if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3307                 return;
3308
3309         if (rx->sdata->vif.bss_conf.csa_active)
3310                 return;
3311
3312         baselen = mgmt->u.beacon.variable - rx->skb->data;
3313         if (baselen > rx->skb->len)
3314                 return;
3315
3316         ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3317                                     mgmt->u.beacon.variable,
3318                                     rx->skb->len - baselen);
3319         if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3320             ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3321                 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3322                 const struct ieee80211_he_operation *he_oper;
3323                 u8 color;
3324
3325                 he_oper = (void *)(ie->data + 1);
3326                 if (le32_get_bits(he_oper->he_oper_params,
3327                                   IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3328                         return;
3329
3330                 color = le32_get_bits(he_oper->he_oper_params,
3331                                       IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3332                 if (color == bss_conf->he_bss_color.color)
3333                         ieee80211_obss_color_collision_notify(&rx->sdata->vif,
3334                                                               BIT_ULL(color),
3335                                                               GFP_ATOMIC);
3336         }
3337 }
3338
3339 static ieee80211_rx_result debug_noinline
3340 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3341 {
3342         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3343         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3344
3345         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3346                 return RX_CONTINUE;
3347
3348         /*
3349          * From here on, look only at management frames.
3350          * Data and control frames are already handled,
3351          * and unknown (reserved) frames are useless.
3352          */
3353         if (rx->skb->len < 24)
3354                 return RX_DROP_MONITOR;
3355
3356         if (!ieee80211_is_mgmt(mgmt->frame_control))
3357                 return RX_DROP_MONITOR;
3358
3359         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3360             ieee80211_is_beacon(mgmt->frame_control) &&
3361             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3362                 int sig = 0;
3363
3364                 /* sw bss color collision detection */
3365                 ieee80211_rx_check_bss_color_collision(rx);
3366
3367                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3368                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3369                         sig = status->signal;
3370
3371                 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3372                                                 rx->skb->data, rx->skb->len,
3373                                                 ieee80211_rx_status_to_khz(status),
3374                                                 sig);
3375                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3376         }
3377
3378         if (ieee80211_drop_unencrypted_mgmt(rx))
3379                 return RX_DROP_UNUSABLE;
3380
3381         return RX_CONTINUE;
3382 }
3383
3384 static bool
3385 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3386 {
3387         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3388         struct ieee80211_sub_if_data *sdata = rx->sdata;
3389
3390         /* TWT actions are only supported in AP for the moment */
3391         if (sdata->vif.type != NL80211_IFTYPE_AP)
3392                 return false;
3393
3394         if (!rx->local->ops->add_twt_setup)
3395                 return false;
3396
3397         if (!sdata->vif.bss_conf.twt_responder)
3398                 return false;
3399
3400         if (!rx->sta)
3401                 return false;
3402
3403         switch (mgmt->u.action.u.s1g.action_code) {
3404         case WLAN_S1G_TWT_SETUP: {
3405                 struct ieee80211_twt_setup *twt;
3406
3407                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3408                                    1 + /* action code */
3409                                    sizeof(struct ieee80211_twt_setup) +
3410                                    2 /* TWT req_type agrt */)
3411                         break;
3412
3413                 twt = (void *)mgmt->u.action.u.s1g.variable;
3414                 if (twt->element_id != WLAN_EID_S1G_TWT)
3415                         break;
3416
3417                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3418                                    4 + /* action code + token + tlv */
3419                                    twt->length)
3420                         break;
3421
3422                 return true; /* queue the frame */
3423         }
3424         case WLAN_S1G_TWT_TEARDOWN:
3425                 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3426                         break;
3427
3428                 return true; /* queue the frame */
3429         default:
3430                 break;
3431         }
3432
3433         return false;
3434 }
3435
3436 static ieee80211_rx_result debug_noinline
3437 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3438 {
3439         struct ieee80211_local *local = rx->local;
3440         struct ieee80211_sub_if_data *sdata = rx->sdata;
3441         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3442         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3443         int len = rx->skb->len;
3444
3445         if (!ieee80211_is_action(mgmt->frame_control))
3446                 return RX_CONTINUE;
3447
3448         /* drop too small frames */
3449         if (len < IEEE80211_MIN_ACTION_SIZE)
3450                 return RX_DROP_UNUSABLE;
3451
3452         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3453             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3454             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3455                 return RX_DROP_UNUSABLE;
3456
3457         switch (mgmt->u.action.category) {
3458         case WLAN_CATEGORY_HT:
3459                 /* reject HT action frames from stations not supporting HT */
3460                 if (!rx->link_sta->pub->ht_cap.ht_supported)
3461                         goto invalid;
3462
3463                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3464                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3465                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3466                     sdata->vif.type != NL80211_IFTYPE_AP &&
3467                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3468                         break;
3469
3470                 /* verify action & smps_control/chanwidth are present */
3471                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3472                         goto invalid;
3473
3474                 switch (mgmt->u.action.u.ht_smps.action) {
3475                 case WLAN_HT_ACTION_SMPS: {
3476                         struct ieee80211_supported_band *sband;
3477                         enum ieee80211_smps_mode smps_mode;
3478                         struct sta_opmode_info sta_opmode = {};
3479
3480                         if (sdata->vif.type != NL80211_IFTYPE_AP &&
3481                             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3482                                 goto handled;
3483
3484                         /* convert to HT capability */
3485                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3486                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3487                                 smps_mode = IEEE80211_SMPS_OFF;
3488                                 break;
3489                         case WLAN_HT_SMPS_CONTROL_STATIC:
3490                                 smps_mode = IEEE80211_SMPS_STATIC;
3491                                 break;
3492                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3493                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3494                                 break;
3495                         default:
3496                                 goto invalid;
3497                         }
3498
3499                         /* if no change do nothing */
3500                         if (rx->link_sta->pub->smps_mode == smps_mode)
3501                                 goto handled;
3502                         rx->link_sta->pub->smps_mode = smps_mode;
3503                         sta_opmode.smps_mode =
3504                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3505                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3506
3507                         sband = rx->local->hw.wiphy->bands[status->band];
3508
3509                         rate_control_rate_update(local, sband, rx->sta, 0,
3510                                                  IEEE80211_RC_SMPS_CHANGED);
3511                         cfg80211_sta_opmode_change_notify(sdata->dev,
3512                                                           rx->sta->addr,
3513                                                           &sta_opmode,
3514                                                           GFP_ATOMIC);
3515                         goto handled;
3516                 }
3517                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3518                         struct ieee80211_supported_band *sband;
3519                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3520                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3521                         struct sta_opmode_info sta_opmode = {};
3522
3523                         /* If it doesn't support 40 MHz it can't change ... */
3524                         if (!(rx->link_sta->pub->ht_cap.cap &
3525                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3526                                 goto handled;
3527
3528                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3529                                 max_bw = IEEE80211_STA_RX_BW_20;
3530                         else
3531                                 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3532
3533                         /* set cur_max_bandwidth and recalc sta bw */
3534                         rx->link_sta->cur_max_bandwidth = max_bw;
3535                         new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3536
3537                         if (rx->link_sta->pub->bandwidth == new_bw)
3538                                 goto handled;
3539
3540                         rx->link_sta->pub->bandwidth = new_bw;
3541                         sband = rx->local->hw.wiphy->bands[status->band];
3542                         sta_opmode.bw =
3543                                 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3544                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3545
3546                         rate_control_rate_update(local, sband, rx->sta, 0,
3547                                                  IEEE80211_RC_BW_CHANGED);
3548                         cfg80211_sta_opmode_change_notify(sdata->dev,
3549                                                           rx->sta->addr,
3550                                                           &sta_opmode,
3551                                                           GFP_ATOMIC);
3552                         goto handled;
3553                 }
3554                 default:
3555                         goto invalid;
3556                 }
3557
3558                 break;
3559         case WLAN_CATEGORY_PUBLIC:
3560                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3561                         goto invalid;
3562                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3563                         break;
3564                 if (!rx->sta)
3565                         break;
3566                 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3567                         break;
3568                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3569                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3570                         break;
3571                 if (len < offsetof(struct ieee80211_mgmt,
3572                                    u.action.u.ext_chan_switch.variable))
3573                         goto invalid;
3574                 goto queue;
3575         case WLAN_CATEGORY_VHT:
3576                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3577                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3578                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3579                     sdata->vif.type != NL80211_IFTYPE_AP &&
3580                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3581                         break;
3582
3583                 /* verify action code is present */
3584                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3585                         goto invalid;
3586
3587                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3588                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3589                         /* verify opmode is present */
3590                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3591                                 goto invalid;
3592                         goto queue;
3593                 }
3594                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3595                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3596                                 goto invalid;
3597                         goto queue;
3598                 }
3599                 default:
3600                         break;
3601                 }
3602                 break;
3603         case WLAN_CATEGORY_BACK:
3604                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3605                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3606                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3607                     sdata->vif.type != NL80211_IFTYPE_AP &&
3608                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3609                         break;
3610
3611                 /* verify action_code is present */
3612                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3613                         break;
3614
3615                 switch (mgmt->u.action.u.addba_req.action_code) {
3616                 case WLAN_ACTION_ADDBA_REQ:
3617                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3618                                    sizeof(mgmt->u.action.u.addba_req)))
3619                                 goto invalid;
3620                         break;
3621                 case WLAN_ACTION_ADDBA_RESP:
3622                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3623                                    sizeof(mgmt->u.action.u.addba_resp)))
3624                                 goto invalid;
3625                         break;
3626                 case WLAN_ACTION_DELBA:
3627                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3628                                    sizeof(mgmt->u.action.u.delba)))
3629                                 goto invalid;
3630                         break;
3631                 default:
3632                         goto invalid;
3633                 }
3634
3635                 goto queue;
3636         case WLAN_CATEGORY_SPECTRUM_MGMT:
3637                 /* verify action_code is present */
3638                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3639                         break;
3640
3641                 switch (mgmt->u.action.u.measurement.action_code) {
3642                 case WLAN_ACTION_SPCT_MSR_REQ:
3643                         if (status->band != NL80211_BAND_5GHZ)
3644                                 break;
3645
3646                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3647                                    sizeof(mgmt->u.action.u.measurement)))
3648                                 break;
3649
3650                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3651                                 break;
3652
3653                         ieee80211_process_measurement_req(sdata, mgmt, len);
3654                         goto handled;
3655                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3656                         u8 *bssid;
3657                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3658                                    sizeof(mgmt->u.action.u.chan_switch)))
3659                                 break;
3660
3661                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3662                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3663                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3664                                 break;
3665
3666                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3667                                 bssid = sdata->deflink.u.mgd.bssid;
3668                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3669                                 bssid = sdata->u.ibss.bssid;
3670                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3671                                 bssid = mgmt->sa;
3672                         else
3673                                 break;
3674
3675                         if (!ether_addr_equal(mgmt->bssid, bssid))
3676                                 break;
3677
3678                         goto queue;
3679                         }
3680                 }
3681                 break;
3682         case WLAN_CATEGORY_SELF_PROTECTED:
3683                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3684                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3685                         break;
3686
3687                 switch (mgmt->u.action.u.self_prot.action_code) {
3688                 case WLAN_SP_MESH_PEERING_OPEN:
3689                 case WLAN_SP_MESH_PEERING_CLOSE:
3690                 case WLAN_SP_MESH_PEERING_CONFIRM:
3691                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3692                                 goto invalid;
3693                         if (sdata->u.mesh.user_mpm)
3694                                 /* userspace handles this frame */
3695                                 break;
3696                         goto queue;
3697                 case WLAN_SP_MGK_INFORM:
3698                 case WLAN_SP_MGK_ACK:
3699                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3700                                 goto invalid;
3701                         break;
3702                 }
3703                 break;
3704         case WLAN_CATEGORY_MESH_ACTION:
3705                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3706                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3707                         break;
3708
3709                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3710                         break;
3711                 if (mesh_action_is_path_sel(mgmt) &&
3712                     !mesh_path_sel_is_hwmp(sdata))
3713                         break;
3714                 goto queue;
3715         case WLAN_CATEGORY_S1G:
3716                 switch (mgmt->u.action.u.s1g.action_code) {
3717                 case WLAN_S1G_TWT_SETUP:
3718                 case WLAN_S1G_TWT_TEARDOWN:
3719                         if (ieee80211_process_rx_twt_action(rx))
3720                                 goto queue;
3721                         break;
3722                 default:
3723                         break;
3724                 }
3725                 break;
3726         }
3727
3728         return RX_CONTINUE;
3729
3730  invalid:
3731         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3732         /* will return in the next handlers */
3733         return RX_CONTINUE;
3734
3735  handled:
3736         if (rx->sta)
3737                 rx->link_sta->rx_stats.packets++;
3738         dev_kfree_skb(rx->skb);
3739         return RX_QUEUED;
3740
3741  queue:
3742         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3743         return RX_QUEUED;
3744 }
3745
3746 static ieee80211_rx_result debug_noinline
3747 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3748 {
3749         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3750         struct cfg80211_rx_info info = {
3751                 .freq = ieee80211_rx_status_to_khz(status),
3752                 .buf = rx->skb->data,
3753                 .len = rx->skb->len,
3754                 .link_id = rx->link_id,
3755                 .have_link_id = rx->link_id >= 0,
3756         };
3757
3758         /* skip known-bad action frames and return them in the next handler */
3759         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3760                 return RX_CONTINUE;
3761
3762         /*
3763          * Getting here means the kernel doesn't know how to handle
3764          * it, but maybe userspace does ... include returned frames
3765          * so userspace can register for those to know whether ones
3766          * it transmitted were processed or returned.
3767          */
3768
3769         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3770             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3771                 info.sig_dbm = status->signal;
3772
3773         if (ieee80211_is_timing_measurement(rx->skb) ||
3774             ieee80211_is_ftm(rx->skb)) {
3775                 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3776                 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3777         }
3778
3779         if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3780                 if (rx->sta)
3781                         rx->link_sta->rx_stats.packets++;
3782                 dev_kfree_skb(rx->skb);
3783                 return RX_QUEUED;
3784         }
3785
3786         return RX_CONTINUE;
3787 }
3788
3789 static ieee80211_rx_result debug_noinline
3790 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3791 {
3792         struct ieee80211_sub_if_data *sdata = rx->sdata;
3793         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3794         int len = rx->skb->len;
3795
3796         if (!ieee80211_is_action(mgmt->frame_control))
3797                 return RX_CONTINUE;
3798
3799         switch (mgmt->u.action.category) {
3800         case WLAN_CATEGORY_SA_QUERY:
3801                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3802                            sizeof(mgmt->u.action.u.sa_query)))
3803                         break;
3804
3805                 switch (mgmt->u.action.u.sa_query.action) {
3806                 case WLAN_ACTION_SA_QUERY_REQUEST:
3807                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3808                                 break;
3809                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3810                         goto handled;
3811                 }
3812                 break;
3813         }
3814
3815         return RX_CONTINUE;
3816
3817  handled:
3818         if (rx->sta)
3819                 rx->link_sta->rx_stats.packets++;
3820         dev_kfree_skb(rx->skb);
3821         return RX_QUEUED;
3822 }
3823
3824 static ieee80211_rx_result debug_noinline
3825 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3826 {
3827         struct ieee80211_local *local = rx->local;
3828         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3829         struct sk_buff *nskb;
3830         struct ieee80211_sub_if_data *sdata = rx->sdata;
3831         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3832
3833         if (!ieee80211_is_action(mgmt->frame_control))
3834                 return RX_CONTINUE;
3835
3836         /*
3837          * For AP mode, hostapd is responsible for handling any action
3838          * frames that we didn't handle, including returning unknown
3839          * ones. For all other modes we will return them to the sender,
3840          * setting the 0x80 bit in the action category, as required by
3841          * 802.11-2012 9.24.4.
3842          * Newer versions of hostapd shall also use the management frame
3843          * registration mechanisms, but older ones still use cooked
3844          * monitor interfaces so push all frames there.
3845          */
3846         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3847             (sdata->vif.type == NL80211_IFTYPE_AP ||
3848              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3849                 return RX_DROP_MONITOR;
3850
3851         if (is_multicast_ether_addr(mgmt->da))
3852                 return RX_DROP_MONITOR;
3853
3854         /* do not return rejected action frames */
3855         if (mgmt->u.action.category & 0x80)
3856                 return RX_DROP_UNUSABLE;
3857
3858         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3859                                GFP_ATOMIC);
3860         if (nskb) {
3861                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3862
3863                 nmgmt->u.action.category |= 0x80;
3864                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3865                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3866
3867                 memset(nskb->cb, 0, sizeof(nskb->cb));
3868
3869                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3870                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3871
3872                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3873                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3874                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3875                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3876                                 info->hw_queue =
3877                                         local->hw.offchannel_tx_hw_queue;
3878                 }
3879
3880                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3881                                             status->band);
3882         }
3883         dev_kfree_skb(rx->skb);
3884         return RX_QUEUED;
3885 }
3886
3887 static ieee80211_rx_result debug_noinline
3888 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3889 {
3890         struct ieee80211_sub_if_data *sdata = rx->sdata;
3891         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3892
3893         if (!ieee80211_is_ext(hdr->frame_control))
3894                 return RX_CONTINUE;
3895
3896         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3897                 return RX_DROP_MONITOR;
3898
3899         /* for now only beacons are ext, so queue them */
3900         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3901
3902         return RX_QUEUED;
3903 }
3904
3905 static ieee80211_rx_result debug_noinline
3906 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3907 {
3908         struct ieee80211_sub_if_data *sdata = rx->sdata;
3909         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3910         __le16 stype;
3911
3912         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3913
3914         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3915             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3916             sdata->vif.type != NL80211_IFTYPE_OCB &&
3917             sdata->vif.type != NL80211_IFTYPE_STATION)
3918                 return RX_DROP_MONITOR;
3919
3920         switch (stype) {
3921         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3922         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3923         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3924                 /* process for all: mesh, mlme, ibss */
3925                 break;
3926         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3927                 if (is_multicast_ether_addr(mgmt->da) &&
3928                     !is_broadcast_ether_addr(mgmt->da))
3929                         return RX_DROP_MONITOR;
3930
3931                 /* process only for station/IBSS */
3932                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3933                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3934                         return RX_DROP_MONITOR;
3935                 break;
3936         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3937         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3938         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3939                 if (is_multicast_ether_addr(mgmt->da) &&
3940                     !is_broadcast_ether_addr(mgmt->da))
3941                         return RX_DROP_MONITOR;
3942
3943                 /* process only for station */
3944                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3945                         return RX_DROP_MONITOR;
3946                 break;
3947         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3948                 /* process only for ibss and mesh */
3949                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3950                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3951                         return RX_DROP_MONITOR;
3952                 break;
3953         default:
3954                 return RX_DROP_MONITOR;
3955         }
3956
3957         ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3958
3959         return RX_QUEUED;
3960 }
3961
3962 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3963                                         struct ieee80211_rate *rate,
3964                                         ieee80211_rx_result reason)
3965 {
3966         struct ieee80211_sub_if_data *sdata;
3967         struct ieee80211_local *local = rx->local;
3968         struct sk_buff *skb = rx->skb, *skb2;
3969         struct net_device *prev_dev = NULL;
3970         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3971         int needed_headroom;
3972
3973         /*
3974          * If cooked monitor has been processed already, then
3975          * don't do it again. If not, set the flag.
3976          */
3977         if (rx->flags & IEEE80211_RX_CMNTR)
3978                 goto out_free_skb;
3979         rx->flags |= IEEE80211_RX_CMNTR;
3980
3981         /* If there are no cooked monitor interfaces, just free the SKB */
3982         if (!local->cooked_mntrs)
3983                 goto out_free_skb;
3984
3985         /* room for the radiotap header based on driver features */
3986         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3987
3988         if (skb_headroom(skb) < needed_headroom &&
3989             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3990                 goto out_free_skb;
3991
3992         /* prepend radiotap information */
3993         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3994                                          false);
3995
3996         skb_reset_mac_header(skb);
3997         skb->ip_summed = CHECKSUM_UNNECESSARY;
3998         skb->pkt_type = PACKET_OTHERHOST;
3999         skb->protocol = htons(ETH_P_802_2);
4000
4001         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4002                 if (!ieee80211_sdata_running(sdata))
4003                         continue;
4004
4005                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
4006                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
4007                         continue;
4008
4009                 if (prev_dev) {
4010                         skb2 = skb_clone(skb, GFP_ATOMIC);
4011                         if (skb2) {
4012                                 skb2->dev = prev_dev;
4013                                 netif_receive_skb(skb2);
4014                         }
4015                 }
4016
4017                 prev_dev = sdata->dev;
4018                 dev_sw_netstats_rx_add(sdata->dev, skb->len);
4019         }
4020
4021         if (prev_dev) {
4022                 skb->dev = prev_dev;
4023                 netif_receive_skb(skb);
4024                 return;
4025         }
4026
4027  out_free_skb:
4028         kfree_skb_reason(skb, (__force u32)reason);
4029 }
4030
4031 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
4032                                          ieee80211_rx_result res)
4033 {
4034         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4035         struct ieee80211_supported_band *sband;
4036         struct ieee80211_rate *rate = NULL;
4037
4038         if (res == RX_QUEUED) {
4039                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
4040                 return;
4041         }
4042
4043         if (res != RX_CONTINUE) {
4044                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
4045                 if (rx->sta)
4046                         rx->link_sta->rx_stats.dropped++;
4047         }
4048
4049         if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) ==
4050                         SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) {
4051                 kfree_skb_reason(rx->skb, (__force u32)res);
4052                 return;
4053         }
4054
4055         sband = rx->local->hw.wiphy->bands[status->band];
4056         if (status->encoding == RX_ENC_LEGACY)
4057                 rate = &sband->bitrates[status->rate_idx];
4058
4059         ieee80211_rx_cooked_monitor(rx, rate, res);
4060 }
4061
4062 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
4063                                   struct sk_buff_head *frames)
4064 {
4065         ieee80211_rx_result res = RX_DROP_MONITOR;
4066         struct sk_buff *skb;
4067
4068 #define CALL_RXH(rxh)                   \
4069         do {                            \
4070                 res = rxh(rx);          \
4071                 if (res != RX_CONTINUE) \
4072                         goto rxh_next;  \
4073         } while (0)
4074
4075         /* Lock here to avoid hitting all of the data used in the RX
4076          * path (e.g. key data, station data, ...) concurrently when
4077          * a frame is released from the reorder buffer due to timeout
4078          * from the timer, potentially concurrently with RX from the
4079          * driver.
4080          */
4081         spin_lock_bh(&rx->local->rx_path_lock);
4082
4083         while ((skb = __skb_dequeue(frames))) {
4084                 /*
4085                  * all the other fields are valid across frames
4086                  * that belong to an aMPDU since they are on the
4087                  * same TID from the same station
4088                  */
4089                 rx->skb = skb;
4090
4091                 if (WARN_ON_ONCE(!rx->link))
4092                         goto rxh_next;
4093
4094                 CALL_RXH(ieee80211_rx_h_check_more_data);
4095                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4096                 CALL_RXH(ieee80211_rx_h_sta_process);
4097                 CALL_RXH(ieee80211_rx_h_decrypt);
4098                 CALL_RXH(ieee80211_rx_h_defragment);
4099                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4100                 /* must be after MMIC verify so header is counted in MPDU mic */
4101                 CALL_RXH(ieee80211_rx_h_amsdu);
4102                 CALL_RXH(ieee80211_rx_h_data);
4103
4104                 /* special treatment -- needs the queue */
4105                 res = ieee80211_rx_h_ctrl(rx, frames);
4106                 if (res != RX_CONTINUE)
4107                         goto rxh_next;
4108
4109                 CALL_RXH(ieee80211_rx_h_mgmt_check);
4110                 CALL_RXH(ieee80211_rx_h_action);
4111                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4112                 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4113                 CALL_RXH(ieee80211_rx_h_action_return);
4114                 CALL_RXH(ieee80211_rx_h_ext);
4115                 CALL_RXH(ieee80211_rx_h_mgmt);
4116
4117  rxh_next:
4118                 ieee80211_rx_handlers_result(rx, res);
4119
4120 #undef CALL_RXH
4121         }
4122
4123         spin_unlock_bh(&rx->local->rx_path_lock);
4124 }
4125
4126 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4127 {
4128         struct sk_buff_head reorder_release;
4129         ieee80211_rx_result res = RX_DROP_MONITOR;
4130
4131         __skb_queue_head_init(&reorder_release);
4132
4133 #define CALL_RXH(rxh)                   \
4134         do {                            \
4135                 res = rxh(rx);          \
4136                 if (res != RX_CONTINUE) \
4137                         goto rxh_next;  \
4138         } while (0)
4139
4140         CALL_RXH(ieee80211_rx_h_check_dup);
4141         CALL_RXH(ieee80211_rx_h_check);
4142
4143         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4144
4145         ieee80211_rx_handlers(rx, &reorder_release);
4146         return;
4147
4148  rxh_next:
4149         ieee80211_rx_handlers_result(rx, res);
4150
4151 #undef CALL_RXH
4152 }
4153
4154 static bool
4155 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4156 {
4157         return !!(sta->valid_links & BIT(link_id));
4158 }
4159
4160 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
4161                                        u8 link_id)
4162 {
4163         rx->link_id = link_id;
4164         rx->link = rcu_dereference(rx->sdata->link[link_id]);
4165
4166         if (!rx->sta)
4167                 return rx->link;
4168
4169         if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
4170                 return false;
4171
4172         rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
4173
4174         return rx->link && rx->link_sta;
4175 }
4176
4177 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
4178                                       struct sta_info *sta, int link_id)
4179 {
4180         rx->link_id = link_id;
4181         rx->sta = sta;
4182
4183         if (sta) {
4184                 rx->local = sta->sdata->local;
4185                 if (!rx->sdata)
4186                         rx->sdata = sta->sdata;
4187                 rx->link_sta = &sta->deflink;
4188         } else {
4189                 rx->link_sta = NULL;
4190         }
4191
4192         if (link_id < 0)
4193                 rx->link = &rx->sdata->deflink;
4194         else if (!ieee80211_rx_data_set_link(rx, link_id))
4195                 return false;
4196
4197         return true;
4198 }
4199
4200 /*
4201  * This function makes calls into the RX path, therefore
4202  * it has to be invoked under RCU read lock.
4203  */
4204 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4205 {
4206         struct sk_buff_head frames;
4207         struct ieee80211_rx_data rx = {
4208                 /* This is OK -- must be QoS data frame */
4209                 .security_idx = tid,
4210                 .seqno_idx = tid,
4211         };
4212         struct tid_ampdu_rx *tid_agg_rx;
4213         int link_id = -1;
4214
4215         /* FIXME: statistics won't be right with this */
4216         if (sta->sta.valid_links)
4217                 link_id = ffs(sta->sta.valid_links) - 1;
4218
4219         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
4220                 return;
4221
4222         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4223         if (!tid_agg_rx)
4224                 return;
4225
4226         __skb_queue_head_init(&frames);
4227
4228         spin_lock(&tid_agg_rx->reorder_lock);
4229         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4230         spin_unlock(&tid_agg_rx->reorder_lock);
4231
4232         if (!skb_queue_empty(&frames)) {
4233                 struct ieee80211_event event = {
4234                         .type = BA_FRAME_TIMEOUT,
4235                         .u.ba.tid = tid,
4236                         .u.ba.sta = &sta->sta,
4237                 };
4238                 drv_event_callback(rx.local, rx.sdata, &event);
4239         }
4240
4241         ieee80211_rx_handlers(&rx, &frames);
4242 }
4243
4244 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4245                                           u16 ssn, u64 filtered,
4246                                           u16 received_mpdus)
4247 {
4248         struct sta_info *sta;
4249         struct tid_ampdu_rx *tid_agg_rx;
4250         struct sk_buff_head frames;
4251         struct ieee80211_rx_data rx = {
4252                 /* This is OK -- must be QoS data frame */
4253                 .security_idx = tid,
4254                 .seqno_idx = tid,
4255         };
4256         int i, diff;
4257
4258         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4259                 return;
4260
4261         __skb_queue_head_init(&frames);
4262
4263         sta = container_of(pubsta, struct sta_info, sta);
4264
4265         if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
4266                 return;
4267
4268         rcu_read_lock();
4269         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4270         if (!tid_agg_rx)
4271                 goto out;
4272
4273         spin_lock_bh(&tid_agg_rx->reorder_lock);
4274
4275         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4276                 int release;
4277
4278                 /* release all frames in the reorder buffer */
4279                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4280                            IEEE80211_SN_MODULO;
4281                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4282                                                  release, &frames);
4283                 /* update ssn to match received ssn */
4284                 tid_agg_rx->head_seq_num = ssn;
4285         } else {
4286                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4287                                                  &frames);
4288         }
4289
4290         /* handle the case that received ssn is behind the mac ssn.
4291          * it can be tid_agg_rx->buf_size behind and still be valid */
4292         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4293         if (diff >= tid_agg_rx->buf_size) {
4294                 tid_agg_rx->reorder_buf_filtered = 0;
4295                 goto release;
4296         }
4297         filtered = filtered >> diff;
4298         ssn += diff;
4299
4300         /* update bitmap */
4301         for (i = 0; i < tid_agg_rx->buf_size; i++) {
4302                 int index = (ssn + i) % tid_agg_rx->buf_size;
4303
4304                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4305                 if (filtered & BIT_ULL(i))
4306                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4307         }
4308
4309         /* now process also frames that the filter marking released */
4310         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4311
4312 release:
4313         spin_unlock_bh(&tid_agg_rx->reorder_lock);
4314
4315         ieee80211_rx_handlers(&rx, &frames);
4316
4317  out:
4318         rcu_read_unlock();
4319 }
4320 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4321
4322 /* main receive path */
4323
4324 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4325 {
4326         return ether_addr_equal(raddr, addr) ||
4327                is_broadcast_ether_addr(raddr);
4328 }
4329
4330 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4331 {
4332         struct ieee80211_sub_if_data *sdata = rx->sdata;
4333         struct sk_buff *skb = rx->skb;
4334         struct ieee80211_hdr *hdr = (void *)skb->data;
4335         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4336         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4337         bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4338                          ieee80211_is_s1g_beacon(hdr->frame_control);
4339
4340         switch (sdata->vif.type) {
4341         case NL80211_IFTYPE_STATION:
4342                 if (!bssid && !sdata->u.mgd.use_4addr)
4343                         return false;
4344                 if (ieee80211_is_first_frag(hdr->seq_ctrl) &&
4345                     ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4346                         return false;
4347                 if (multicast)
4348                         return true;
4349                 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4350         case NL80211_IFTYPE_ADHOC:
4351                 if (!bssid)
4352                         return false;
4353                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4354                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4355                     !is_valid_ether_addr(hdr->addr2))
4356                         return false;
4357                 if (ieee80211_is_beacon(hdr->frame_control))
4358                         return true;
4359                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4360                         return false;
4361                 if (!multicast &&
4362                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4363                         return false;
4364                 if (!rx->sta) {
4365                         int rate_idx;
4366                         if (status->encoding != RX_ENC_LEGACY)
4367                                 rate_idx = 0; /* TODO: HT/VHT rates */
4368                         else
4369                                 rate_idx = status->rate_idx;
4370                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4371                                                  BIT(rate_idx));
4372                 }
4373                 return true;
4374         case NL80211_IFTYPE_OCB:
4375                 if (!bssid)
4376                         return false;
4377                 if (!ieee80211_is_data_present(hdr->frame_control))
4378                         return false;
4379                 if (!is_broadcast_ether_addr(bssid))
4380                         return false;
4381                 if (!multicast &&
4382                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4383                         return false;
4384                 if (!rx->sta) {
4385                         int rate_idx;
4386                         if (status->encoding != RX_ENC_LEGACY)
4387                                 rate_idx = 0; /* TODO: HT rates */
4388                         else
4389                                 rate_idx = status->rate_idx;
4390                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4391                                                 BIT(rate_idx));
4392                 }
4393                 return true;
4394         case NL80211_IFTYPE_MESH_POINT:
4395                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4396                         return false;
4397                 if (multicast)
4398                         return true;
4399                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4400         case NL80211_IFTYPE_AP_VLAN:
4401         case NL80211_IFTYPE_AP:
4402                 if (!bssid)
4403                         return ieee80211_is_our_addr(sdata, hdr->addr1,
4404                                                      &rx->link_id);
4405
4406                 if (!is_broadcast_ether_addr(bssid) &&
4407                     !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4408                         /*
4409                          * Accept public action frames even when the
4410                          * BSSID doesn't match, this is used for P2P
4411                          * and location updates. Note that mac80211
4412                          * itself never looks at these frames.
4413                          */
4414                         if (!multicast &&
4415                             !ieee80211_is_our_addr(sdata, hdr->addr1,
4416                                                    &rx->link_id))
4417                                 return false;
4418                         if (ieee80211_is_public_action(hdr, skb->len))
4419                                 return true;
4420                         return ieee80211_is_beacon(hdr->frame_control);
4421                 }
4422
4423                 if (!ieee80211_has_tods(hdr->frame_control)) {
4424                         /* ignore data frames to TDLS-peers */
4425                         if (ieee80211_is_data(hdr->frame_control))
4426                                 return false;
4427                         /* ignore action frames to TDLS-peers */
4428                         if (ieee80211_is_action(hdr->frame_control) &&
4429                             !is_broadcast_ether_addr(bssid) &&
4430                             !ether_addr_equal(bssid, hdr->addr1))
4431                                 return false;
4432                 }
4433
4434                 /*
4435                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4436                  * the BSSID - we've checked that already but may have accepted
4437                  * the wildcard (ff:ff:ff:ff:ff:ff).
4438                  *
4439                  * It also says:
4440                  *      The BSSID of the Data frame is determined as follows:
4441                  *      a) If the STA is contained within an AP or is associated
4442                  *         with an AP, the BSSID is the address currently in use
4443                  *         by the STA contained in the AP.
4444                  *
4445                  * So we should not accept data frames with an address that's
4446                  * multicast.
4447                  *
4448                  * Accepting it also opens a security problem because stations
4449                  * could encrypt it with the GTK and inject traffic that way.
4450                  */
4451                 if (ieee80211_is_data(hdr->frame_control) && multicast)
4452                         return false;
4453
4454                 return true;
4455         case NL80211_IFTYPE_P2P_DEVICE:
4456                 return ieee80211_is_public_action(hdr, skb->len) ||
4457                        ieee80211_is_probe_req(hdr->frame_control) ||
4458                        ieee80211_is_probe_resp(hdr->frame_control) ||
4459                        ieee80211_is_beacon(hdr->frame_control);
4460         case NL80211_IFTYPE_NAN:
4461                 /* Currently no frames on NAN interface are allowed */
4462                 return false;
4463         default:
4464                 break;
4465         }
4466
4467         WARN_ON_ONCE(1);
4468         return false;
4469 }
4470
4471 void ieee80211_check_fast_rx(struct sta_info *sta)
4472 {
4473         struct ieee80211_sub_if_data *sdata = sta->sdata;
4474         struct ieee80211_local *local = sdata->local;
4475         struct ieee80211_key *key;
4476         struct ieee80211_fast_rx fastrx = {
4477                 .dev = sdata->dev,
4478                 .vif_type = sdata->vif.type,
4479                 .control_port_protocol = sdata->control_port_protocol,
4480         }, *old, *new = NULL;
4481         u32 offload_flags;
4482         bool set_offload = false;
4483         bool assign = false;
4484         bool offload;
4485
4486         /* use sparse to check that we don't return without updating */
4487         __acquire(check_fast_rx);
4488
4489         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4490         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4491         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4492         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4493
4494         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4495
4496         /* fast-rx doesn't do reordering */
4497         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4498             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4499                 goto clear;
4500
4501         switch (sdata->vif.type) {
4502         case NL80211_IFTYPE_STATION:
4503                 if (sta->sta.tdls) {
4504                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4505                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4506                         fastrx.expected_ds_bits = 0;
4507                 } else {
4508                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4509                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4510                         fastrx.expected_ds_bits =
4511                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4512                 }
4513
4514                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4515                         fastrx.expected_ds_bits |=
4516                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4517                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4518                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4519                 }
4520
4521                 if (!sdata->u.mgd.powersave)
4522                         break;
4523
4524                 /* software powersave is a huge mess, avoid all of it */
4525                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4526                         goto clear;
4527                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4528                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4529                         goto clear;
4530                 break;
4531         case NL80211_IFTYPE_AP_VLAN:
4532         case NL80211_IFTYPE_AP:
4533                 /* parallel-rx requires this, at least with calls to
4534                  * ieee80211_sta_ps_transition()
4535                  */
4536                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4537                         goto clear;
4538                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4539                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4540                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4541
4542                 fastrx.internal_forward =
4543                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4544                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4545                          !sdata->u.vlan.sta);
4546
4547                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4548                     sdata->u.vlan.sta) {
4549                         fastrx.expected_ds_bits |=
4550                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4551                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4552                         fastrx.internal_forward = 0;
4553                 }
4554
4555                 break;
4556         case NL80211_IFTYPE_MESH_POINT:
4557                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
4558                                                       IEEE80211_FCTL_TODS);
4559                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4560                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4561                 break;
4562         default:
4563                 goto clear;
4564         }
4565
4566         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4567                 goto clear;
4568
4569         rcu_read_lock();
4570         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4571         if (!key)
4572                 key = rcu_dereference(sdata->default_unicast_key);
4573         if (key) {
4574                 switch (key->conf.cipher) {
4575                 case WLAN_CIPHER_SUITE_TKIP:
4576                         /* we don't want to deal with MMIC in fast-rx */
4577                         goto clear_rcu;
4578                 case WLAN_CIPHER_SUITE_CCMP:
4579                 case WLAN_CIPHER_SUITE_CCMP_256:
4580                 case WLAN_CIPHER_SUITE_GCMP:
4581                 case WLAN_CIPHER_SUITE_GCMP_256:
4582                         break;
4583                 default:
4584                         /* We also don't want to deal with
4585                          * WEP or cipher scheme.
4586                          */
4587                         goto clear_rcu;
4588                 }
4589
4590                 fastrx.key = true;
4591                 fastrx.icv_len = key->conf.icv_len;
4592         }
4593
4594         assign = true;
4595  clear_rcu:
4596         rcu_read_unlock();
4597  clear:
4598         __release(check_fast_rx);
4599
4600         if (assign)
4601                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4602
4603         offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4604         offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4605
4606         if (assign && offload)
4607                 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4608         else
4609                 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4610
4611         if (set_offload)
4612                 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4613
4614         spin_lock_bh(&sta->lock);
4615         old = rcu_dereference_protected(sta->fast_rx, true);
4616         rcu_assign_pointer(sta->fast_rx, new);
4617         spin_unlock_bh(&sta->lock);
4618
4619         if (old)
4620                 kfree_rcu(old, rcu_head);
4621 }
4622
4623 void ieee80211_clear_fast_rx(struct sta_info *sta)
4624 {
4625         struct ieee80211_fast_rx *old;
4626
4627         spin_lock_bh(&sta->lock);
4628         old = rcu_dereference_protected(sta->fast_rx, true);
4629         RCU_INIT_POINTER(sta->fast_rx, NULL);
4630         spin_unlock_bh(&sta->lock);
4631
4632         if (old)
4633                 kfree_rcu(old, rcu_head);
4634 }
4635
4636 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4637 {
4638         struct ieee80211_local *local = sdata->local;
4639         struct sta_info *sta;
4640
4641         lockdep_assert_held(&local->sta_mtx);
4642
4643         list_for_each_entry(sta, &local->sta_list, list) {
4644                 if (sdata != sta->sdata &&
4645                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4646                         continue;
4647                 ieee80211_check_fast_rx(sta);
4648         }
4649 }
4650
4651 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4652 {
4653         struct ieee80211_local *local = sdata->local;
4654
4655         mutex_lock(&local->sta_mtx);
4656         __ieee80211_check_fast_rx_iface(sdata);
4657         mutex_unlock(&local->sta_mtx);
4658 }
4659
4660 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4661                               struct ieee80211_fast_rx *fast_rx,
4662                               int orig_len)
4663 {
4664         struct ieee80211_sta_rx_stats *stats;
4665         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4666         struct sta_info *sta = rx->sta;
4667         struct link_sta_info *link_sta;
4668         struct sk_buff *skb = rx->skb;
4669         void *sa = skb->data + ETH_ALEN;
4670         void *da = skb->data;
4671
4672         if (rx->link_id >= 0) {
4673                 link_sta = rcu_dereference(sta->link[rx->link_id]);
4674                 if (WARN_ON_ONCE(!link_sta)) {
4675                         dev_kfree_skb(rx->skb);
4676                         return;
4677                 }
4678         } else {
4679                 link_sta = &sta->deflink;
4680         }
4681
4682         stats = &link_sta->rx_stats;
4683         if (fast_rx->uses_rss)
4684                 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4685
4686         /* statistics part of ieee80211_rx_h_sta_process() */
4687         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4688                 stats->last_signal = status->signal;
4689                 if (!fast_rx->uses_rss)
4690                         ewma_signal_add(&link_sta->rx_stats_avg.signal,
4691                                         -status->signal);
4692         }
4693
4694         if (status->chains) {
4695                 int i;
4696
4697                 stats->chains = status->chains;
4698                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4699                         int signal = status->chain_signal[i];
4700
4701                         if (!(status->chains & BIT(i)))
4702                                 continue;
4703
4704                         stats->chain_signal_last[i] = signal;
4705                         if (!fast_rx->uses_rss)
4706                                 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4707                                                 -signal);
4708                 }
4709         }
4710         /* end of statistics */
4711
4712         stats->last_rx = jiffies;
4713         stats->last_rate = sta_stats_encode_rate(status);
4714
4715         stats->fragments++;
4716         stats->packets++;
4717
4718         skb->dev = fast_rx->dev;
4719
4720         dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4721
4722         /* The seqno index has the same property as needed
4723          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4724          * for non-QoS-data frames. Here we know it's a data
4725          * frame, so count MSDUs.
4726          */
4727         u64_stats_update_begin(&stats->syncp);
4728         stats->msdu[rx->seqno_idx]++;
4729         stats->bytes += orig_len;
4730         u64_stats_update_end(&stats->syncp);
4731
4732         if (fast_rx->internal_forward) {
4733                 struct sk_buff *xmit_skb = NULL;
4734                 if (is_multicast_ether_addr(da)) {
4735                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4736                 } else if (!ether_addr_equal(da, sa) &&
4737                            sta_info_get(rx->sdata, da)) {
4738                         xmit_skb = skb;
4739                         skb = NULL;
4740                 }
4741
4742                 if (xmit_skb) {
4743                         /*
4744                          * Send to wireless media and increase priority by 256
4745                          * to keep the received priority instead of
4746                          * reclassifying the frame (see cfg80211_classify8021d).
4747                          */
4748                         xmit_skb->priority += 256;
4749                         xmit_skb->protocol = htons(ETH_P_802_3);
4750                         skb_reset_network_header(xmit_skb);
4751                         skb_reset_mac_header(xmit_skb);
4752                         dev_queue_xmit(xmit_skb);
4753                 }
4754
4755                 if (!skb)
4756                         return;
4757         }
4758
4759         /* deliver to local stack */
4760         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4761         ieee80211_deliver_skb_to_local_stack(skb, rx);
4762 }
4763
4764 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4765                                      struct ieee80211_fast_rx *fast_rx)
4766 {
4767         struct sk_buff *skb = rx->skb;
4768         struct ieee80211_hdr *hdr = (void *)skb->data;
4769         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4770         static ieee80211_rx_result res;
4771         int orig_len = skb->len;
4772         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4773         int snap_offs = hdrlen;
4774         struct {
4775                 u8 snap[sizeof(rfc1042_header)];
4776                 __be16 proto;
4777         } *payload __aligned(2);
4778         struct {
4779                 u8 da[ETH_ALEN];
4780                 u8 sa[ETH_ALEN];
4781         } addrs __aligned(2);
4782         struct ieee80211_sta_rx_stats *stats;
4783
4784         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4785          * to a common data structure; drivers can implement that per queue
4786          * but we don't have that information in mac80211
4787          */
4788         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4789                 return false;
4790
4791 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4792
4793         /* If using encryption, we also need to have:
4794          *  - PN_VALIDATED: similar, but the implementation is tricky
4795          *  - DECRYPTED: necessary for PN_VALIDATED
4796          */
4797         if (fast_rx->key &&
4798             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4799                 return false;
4800
4801         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4802                 return false;
4803
4804         if (unlikely(ieee80211_is_frag(hdr)))
4805                 return false;
4806
4807         /* Since our interface address cannot be multicast, this
4808          * implicitly also rejects multicast frames without the
4809          * explicit check.
4810          *
4811          * We shouldn't get any *data* frames not addressed to us
4812          * (AP mode will accept multicast *management* frames), but
4813          * punting here will make it go through the full checks in
4814          * ieee80211_accept_frame().
4815          */
4816         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4817                 return false;
4818
4819         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4820                                               IEEE80211_FCTL_TODS)) !=
4821             fast_rx->expected_ds_bits)
4822                 return false;
4823
4824         /* assign the key to drop unencrypted frames (later)
4825          * and strip the IV/MIC if necessary
4826          */
4827         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4828                 /* GCMP header length is the same */
4829                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4830         }
4831
4832         if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
4833             !(status->rx_flags & IEEE80211_RX_AMSDU)) {
4834                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4835                         return false;
4836
4837                 payload = (void *)(skb->data + snap_offs);
4838
4839                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4840                         return false;
4841
4842                 /* Don't handle these here since they require special code.
4843                  * Accept AARP and IPX even though they should come with a
4844                  * bridge-tunnel header - but if we get them this way then
4845                  * there's little point in discarding them.
4846                  */
4847                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4848                              payload->proto == fast_rx->control_port_protocol))
4849                         return false;
4850         }
4851
4852         /* after this point, don't punt to the slowpath! */
4853
4854         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4855             pskb_trim(skb, skb->len - fast_rx->icv_len))
4856                 goto drop;
4857
4858         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4859                 goto drop;
4860
4861         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4862                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4863                     RX_QUEUED)
4864                         goto drop;
4865
4866                 return true;
4867         }
4868
4869         /* do the header conversion - first grab the addresses */
4870         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4871         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4872         if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
4873             skb_pull(skb, snap_offs - 2);
4874             put_unaligned_be16(skb->len - 2, skb->data);
4875         } else {
4876             skb_postpull_rcsum(skb, skb->data + snap_offs,
4877                                sizeof(rfc1042_header) + 2);
4878
4879             /* remove the SNAP but leave the ethertype */
4880             skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4881         }
4882         /* push the addresses in front */
4883         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4884
4885         res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
4886         switch (res) {
4887         case RX_QUEUED:
4888                 return true;
4889         case RX_CONTINUE:
4890                 break;
4891         default:
4892                 goto drop;
4893         }
4894
4895         ieee80211_rx_8023(rx, fast_rx, orig_len);
4896
4897         return true;
4898  drop:
4899         dev_kfree_skb(skb);
4900
4901         if (fast_rx->uses_rss)
4902                 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
4903         else
4904                 stats = &rx->link_sta->rx_stats;
4905
4906         stats->dropped++;
4907         return true;
4908 }
4909
4910 /*
4911  * This function returns whether or not the SKB
4912  * was destined for RX processing or not, which,
4913  * if consume is true, is equivalent to whether
4914  * or not the skb was consumed.
4915  */
4916 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4917                                             struct sk_buff *skb, bool consume)
4918 {
4919         struct ieee80211_local *local = rx->local;
4920         struct ieee80211_sub_if_data *sdata = rx->sdata;
4921         struct ieee80211_hdr *hdr = (void *)skb->data;
4922         struct link_sta_info *link_sta = rx->link_sta;
4923         struct ieee80211_link_data *link = rx->link;
4924
4925         rx->skb = skb;
4926
4927         /* See if we can do fast-rx; if we have to copy we already lost,
4928          * so punt in that case. We should never have to deliver a data
4929          * frame to multiple interfaces anyway.
4930          *
4931          * We skip the ieee80211_accept_frame() call and do the necessary
4932          * checking inside ieee80211_invoke_fast_rx().
4933          */
4934         if (consume && rx->sta) {
4935                 struct ieee80211_fast_rx *fast_rx;
4936
4937                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4938                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4939                         return true;
4940         }
4941
4942         if (!ieee80211_accept_frame(rx))
4943                 return false;
4944
4945         if (!consume) {
4946                 struct skb_shared_hwtstamps *shwt;
4947
4948                 rx->skb = skb_copy(skb, GFP_ATOMIC);
4949                 if (!rx->skb) {
4950                         if (net_ratelimit())
4951                                 wiphy_debug(local->hw.wiphy,
4952                                         "failed to copy skb for %s\n",
4953                                         sdata->name);
4954                         return true;
4955                 }
4956
4957                 /* skb_copy() does not copy the hw timestamps, so copy it
4958                  * explicitly
4959                  */
4960                 shwt = skb_hwtstamps(rx->skb);
4961                 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
4962
4963                 /* Update the hdr pointer to the new skb for translation below */
4964                 hdr = (struct ieee80211_hdr *)rx->skb->data;
4965         }
4966
4967         if (unlikely(rx->sta && rx->sta->sta.mlo) &&
4968             is_unicast_ether_addr(hdr->addr1)) {
4969                 /* translate to MLD addresses */
4970                 if (ether_addr_equal(link->conf->addr, hdr->addr1))
4971                         ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
4972                 if (ether_addr_equal(link_sta->addr, hdr->addr2))
4973                         ether_addr_copy(hdr->addr2, rx->sta->addr);
4974                 /* translate A3 only if it's the BSSID */
4975                 if (!ieee80211_has_tods(hdr->frame_control) &&
4976                     !ieee80211_has_fromds(hdr->frame_control)) {
4977                         if (ether_addr_equal(link_sta->addr, hdr->addr3))
4978                                 ether_addr_copy(hdr->addr3, rx->sta->addr);
4979                         else if (ether_addr_equal(link->conf->addr, hdr->addr3))
4980                                 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
4981                 }
4982                 /* not needed for A4 since it can only carry the SA */
4983         }
4984
4985         ieee80211_invoke_rx_handlers(rx);
4986         return true;
4987 }
4988
4989 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4990                                        struct ieee80211_sta *pubsta,
4991                                        struct sk_buff *skb,
4992                                        struct list_head *list)
4993 {
4994         struct ieee80211_local *local = hw_to_local(hw);
4995         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4996         struct ieee80211_fast_rx *fast_rx;
4997         struct ieee80211_rx_data rx;
4998         struct sta_info *sta;
4999         int link_id = -1;
5000
5001         memset(&rx, 0, sizeof(rx));
5002         rx.skb = skb;
5003         rx.local = local;
5004         rx.list = list;
5005         rx.link_id = -1;
5006
5007         I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5008
5009         /* drop frame if too short for header */
5010         if (skb->len < sizeof(struct ethhdr))
5011                 goto drop;
5012
5013         if (!pubsta)
5014                 goto drop;
5015
5016         if (status->link_valid)
5017                 link_id = status->link_id;
5018
5019         /*
5020          * TODO: Should the frame be dropped if the right link_id is not
5021          * available? Or may be it is fine in the current form to proceed with
5022          * the frame processing because with frame being in 802.3 format,
5023          * link_id is used only for stats purpose and updating the stats on
5024          * the deflink is fine?
5025          */
5026         sta = container_of(pubsta, struct sta_info, sta);
5027         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5028                 goto drop;
5029
5030         fast_rx = rcu_dereference(rx.sta->fast_rx);
5031         if (!fast_rx)
5032                 goto drop;
5033
5034         ieee80211_rx_8023(&rx, fast_rx, skb->len);
5035         return;
5036
5037 drop:
5038         dev_kfree_skb(skb);
5039 }
5040
5041 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
5042                                        struct sk_buff *skb, bool consume)
5043 {
5044         struct link_sta_info *link_sta;
5045         struct ieee80211_hdr *hdr = (void *)skb->data;
5046         struct sta_info *sta;
5047         int link_id = -1;
5048
5049         /*
5050          * Look up link station first, in case there's a
5051          * chance that they might have a link address that
5052          * is identical to the MLD address, that way we'll
5053          * have the link information if needed.
5054          */
5055         link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
5056         if (link_sta) {
5057                 sta = link_sta->sta;
5058                 link_id = link_sta->link_id;
5059         } else {
5060                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5061
5062                 sta = sta_info_get_bss(rx->sdata, hdr->addr2);
5063                 if (status->link_valid)
5064                         link_id = status->link_id;
5065         }
5066
5067         if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
5068                 return false;
5069
5070         return ieee80211_prepare_and_rx_handle(rx, skb, consume);
5071 }
5072
5073 /*
5074  * This is the actual Rx frames handler. as it belongs to Rx path it must
5075  * be called with rcu_read_lock protection.
5076  */
5077 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
5078                                          struct ieee80211_sta *pubsta,
5079                                          struct sk_buff *skb,
5080                                          struct list_head *list)
5081 {
5082         struct ieee80211_local *local = hw_to_local(hw);
5083         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5084         struct ieee80211_sub_if_data *sdata;
5085         struct ieee80211_hdr *hdr;
5086         __le16 fc;
5087         struct ieee80211_rx_data rx;
5088         struct ieee80211_sub_if_data *prev;
5089         struct rhlist_head *tmp;
5090         int err = 0;
5091
5092         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5093         memset(&rx, 0, sizeof(rx));
5094         rx.skb = skb;
5095         rx.local = local;
5096         rx.list = list;
5097         rx.link_id = -1;
5098
5099         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5100                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5101
5102         if (ieee80211_is_mgmt(fc)) {
5103                 /* drop frame if too short for header */
5104                 if (skb->len < ieee80211_hdrlen(fc))
5105                         err = -ENOBUFS;
5106                 else
5107                         err = skb_linearize(skb);
5108         } else {
5109                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5110         }
5111
5112         if (err) {
5113                 dev_kfree_skb(skb);
5114                 return;
5115         }
5116
5117         hdr = (struct ieee80211_hdr *)skb->data;
5118         ieee80211_parse_qos(&rx);
5119         ieee80211_verify_alignment(&rx);
5120
5121         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5122                      ieee80211_is_beacon(hdr->frame_control) ||
5123                      ieee80211_is_s1g_beacon(hdr->frame_control)))
5124                 ieee80211_scan_rx(local, skb);
5125
5126         if (ieee80211_is_data(fc)) {
5127                 struct sta_info *sta, *prev_sta;
5128                 int link_id = -1;
5129
5130                 if (status->link_valid)
5131                         link_id = status->link_id;
5132
5133                 if (pubsta) {
5134                         sta = container_of(pubsta, struct sta_info, sta);
5135                         if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5136                                 goto out;
5137
5138                         /*
5139                          * In MLO connection, fetch the link_id using addr2
5140                          * when the driver does not pass link_id in status.
5141                          * When the address translation is already performed by
5142                          * driver/hw, the valid link_id must be passed in
5143                          * status.
5144                          */
5145
5146                         if (!status->link_valid && pubsta->mlo) {
5147                                 struct ieee80211_hdr *hdr = (void *)skb->data;
5148                                 struct link_sta_info *link_sta;
5149
5150                                 link_sta = link_sta_info_get_bss(rx.sdata,
5151                                                                  hdr->addr2);
5152                                 if (!link_sta)
5153                                         goto out;
5154
5155                                 ieee80211_rx_data_set_link(&rx, link_sta->link_id);
5156                         }
5157
5158                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5159                                 return;
5160                         goto out;
5161                 }
5162
5163                 prev_sta = NULL;
5164
5165                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5166                         if (!prev_sta) {
5167                                 prev_sta = sta;
5168                                 continue;
5169                         }
5170
5171                         rx.sdata = prev_sta->sdata;
5172                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5173                                 goto out;
5174
5175                         if (!status->link_valid && prev_sta->sta.mlo)
5176                                 continue;
5177
5178                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
5179
5180                         prev_sta = sta;
5181                 }
5182
5183                 if (prev_sta) {
5184                         rx.sdata = prev_sta->sdata;
5185                         if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5186                                 goto out;
5187
5188                         if (!status->link_valid && prev_sta->sta.mlo)
5189                                 goto out;
5190
5191                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5192                                 return;
5193                         goto out;
5194                 }
5195         }
5196
5197         prev = NULL;
5198
5199         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5200                 if (!ieee80211_sdata_running(sdata))
5201                         continue;
5202
5203                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5204                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5205                         continue;
5206
5207                 /*
5208                  * frame is destined for this interface, but if it's
5209                  * not also for the previous one we handle that after
5210                  * the loop to avoid copying the SKB once too much
5211                  */
5212
5213                 if (!prev) {
5214                         prev = sdata;
5215                         continue;
5216                 }
5217
5218                 rx.sdata = prev;
5219                 ieee80211_rx_for_interface(&rx, skb, false);
5220
5221                 prev = sdata;
5222         }
5223
5224         if (prev) {
5225                 rx.sdata = prev;
5226
5227                 if (ieee80211_rx_for_interface(&rx, skb, true))
5228                         return;
5229         }
5230
5231  out:
5232         dev_kfree_skb(skb);
5233 }
5234
5235 /*
5236  * This is the receive path handler. It is called by a low level driver when an
5237  * 802.11 MPDU is received from the hardware.
5238  */
5239 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5240                        struct sk_buff *skb, struct list_head *list)
5241 {
5242         struct ieee80211_local *local = hw_to_local(hw);
5243         struct ieee80211_rate *rate = NULL;
5244         struct ieee80211_supported_band *sband;
5245         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5246         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5247
5248         WARN_ON_ONCE(softirq_count() == 0);
5249
5250         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5251                 goto drop;
5252
5253         sband = local->hw.wiphy->bands[status->band];
5254         if (WARN_ON(!sband))
5255                 goto drop;
5256
5257         /*
5258          * If we're suspending, it is possible although not too likely
5259          * that we'd be receiving frames after having already partially
5260          * quiesced the stack. We can't process such frames then since
5261          * that might, for example, cause stations to be added or other
5262          * driver callbacks be invoked.
5263          */
5264         if (unlikely(local->quiescing || local->suspended))
5265                 goto drop;
5266
5267         /* We might be during a HW reconfig, prevent Rx for the same reason */
5268         if (unlikely(local->in_reconfig))
5269                 goto drop;
5270
5271         /*
5272          * The same happens when we're not even started,
5273          * but that's worth a warning.
5274          */
5275         if (WARN_ON(!local->started))
5276                 goto drop;
5277
5278         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5279                 /*
5280                  * Validate the rate, unless a PLCP error means that
5281                  * we probably can't have a valid rate here anyway.
5282                  */
5283
5284                 switch (status->encoding) {
5285                 case RX_ENC_HT:
5286                         /*
5287                          * rate_idx is MCS index, which can be [0-76]
5288                          * as documented on:
5289                          *
5290                          * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5291                          *
5292                          * Anything else would be some sort of driver or
5293                          * hardware error. The driver should catch hardware
5294                          * errors.
5295                          */
5296                         if (WARN(status->rate_idx > 76,
5297                                  "Rate marked as an HT rate but passed "
5298                                  "status->rate_idx is not "
5299                                  "an MCS index [0-76]: %d (0x%02x)\n",
5300                                  status->rate_idx,
5301                                  status->rate_idx))
5302                                 goto drop;
5303                         break;
5304                 case RX_ENC_VHT:
5305                         if (WARN_ONCE(status->rate_idx > 11 ||
5306                                       !status->nss ||
5307                                       status->nss > 8,
5308                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5309                                       status->rate_idx, status->nss))
5310                                 goto drop;
5311                         break;
5312                 case RX_ENC_HE:
5313                         if (WARN_ONCE(status->rate_idx > 11 ||
5314                                       !status->nss ||
5315                                       status->nss > 8,
5316                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5317                                       status->rate_idx, status->nss))
5318                                 goto drop;
5319                         break;
5320                 case RX_ENC_EHT:
5321                         if (WARN_ONCE(status->rate_idx > 15 ||
5322                                       !status->nss ||
5323                                       status->nss > 8 ||
5324                                       status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
5325                                       "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
5326                                       status->rate_idx, status->nss, status->eht.gi))
5327                                 goto drop;
5328                         break;
5329                 default:
5330                         WARN_ON_ONCE(1);
5331                         fallthrough;
5332                 case RX_ENC_LEGACY:
5333                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5334                                 goto drop;
5335                         rate = &sband->bitrates[status->rate_idx];
5336                 }
5337         }
5338
5339         if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5340                 goto drop;
5341
5342         status->rx_flags = 0;
5343
5344         kcov_remote_start_common(skb_get_kcov_handle(skb));
5345
5346         /*
5347          * Frames with failed FCS/PLCP checksum are not returned,
5348          * all other frames are returned without radiotap header
5349          * if it was previously present.
5350          * Also, frames with less than 16 bytes are dropped.
5351          */
5352         if (!(status->flag & RX_FLAG_8023))
5353                 skb = ieee80211_rx_monitor(local, skb, rate);
5354         if (skb) {
5355                 if ((status->flag & RX_FLAG_8023) ||
5356                         ieee80211_is_data_present(hdr->frame_control))
5357                         ieee80211_tpt_led_trig_rx(local, skb->len);
5358
5359                 if (status->flag & RX_FLAG_8023)
5360                         __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5361                 else
5362                         __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5363         }
5364
5365         kcov_remote_stop();
5366         return;
5367  drop:
5368         kfree_skb(skb);
5369 }
5370 EXPORT_SYMBOL(ieee80211_rx_list);
5371
5372 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5373                        struct sk_buff *skb, struct napi_struct *napi)
5374 {
5375         struct sk_buff *tmp;
5376         LIST_HEAD(list);
5377
5378
5379         /*
5380          * key references and virtual interfaces are protected using RCU
5381          * and this requires that we are in a read-side RCU section during
5382          * receive processing
5383          */
5384         rcu_read_lock();
5385         ieee80211_rx_list(hw, pubsta, skb, &list);
5386         rcu_read_unlock();
5387
5388         if (!napi) {
5389                 netif_receive_skb_list(&list);
5390                 return;
5391         }
5392
5393         list_for_each_entry_safe(skb, tmp, &list, list) {
5394                 skb_list_del_init(skb);
5395                 napi_gro_receive(napi, skb);
5396         }
5397 }
5398 EXPORT_SYMBOL(ieee80211_rx_napi);
5399
5400 /* This is a version of the rx handler that can be called from hard irq
5401  * context. Post the skb on the queue and schedule the tasklet */
5402 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5403 {
5404         struct ieee80211_local *local = hw_to_local(hw);
5405
5406         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5407
5408         skb->pkt_type = IEEE80211_RX_MSG;
5409         skb_queue_tail(&local->skb_queue, skb);
5410         tasklet_schedule(&local->tasklet);
5411 }
5412 EXPORT_SYMBOL(ieee80211_rx_irqsafe);