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) 2018-2021 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/bitops.h> 21#include <net/mac80211.h> 22#include <net/ieee80211_radiotap.h> 23#include <asm/unaligned.h> 24 25#include "ieee80211_i.h" 26#include "driver-ops.h" 27#include "led.h" 28#include "mesh.h" 29#include "wep.h" 30#include "wpa.h" 31#include "tkip.h" 32#include "wme.h" 33#include "rate.h" 34 35static inline void ieee80211_rx_stats(struct net_device *dev, u32 len) 36{ 37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 38 39 u64_stats_update_begin(&tstats->syncp); 40 tstats->rx_packets++; 41 tstats->rx_bytes += len; 42 u64_stats_update_end(&tstats->syncp); 43} 44 45/* 46 * monitor mode reception 47 * 48 * This function cleans up the SKB, i.e. it removes all the stuff 49 * only useful for monitoring. 50 */ 51static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb, 52 unsigned int present_fcs_len, 53 unsigned int rtap_space) 54{ 55 struct ieee80211_hdr *hdr; 56 unsigned int hdrlen; 57 __le16 fc; 58 59 if (present_fcs_len) 60 __pskb_trim(skb, skb->len - present_fcs_len); 61 __pskb_pull(skb, rtap_space); 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 91static 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 116static int 117ieee80211_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 /* vendor presence bitmap */ 130 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) 131 len += 4; 132 133 if (ieee80211_have_rx_timestamp(status)) { 134 len = ALIGN(len, 8); 135 len += 8; 136 } 137 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 138 len += 1; 139 140 /* antenna field, if we don't have per-chain info */ 141 if (!status->chains) 142 len += 1; 143 144 /* padding for RX_FLAGS if necessary */ 145 len = ALIGN(len, 2); 146 147 if (status->encoding == RX_ENC_HT) /* HT info */ 148 len += 3; 149 150 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 151 len = ALIGN(len, 4); 152 len += 8; 153 } 154 155 if (status->encoding == RX_ENC_VHT) { 156 len = ALIGN(len, 2); 157 len += 12; 158 } 159 160 if (local->hw.radiotap_timestamp.units_pos >= 0) { 161 len = ALIGN(len, 8); 162 len += 12; 163 } 164 165 if (status->encoding == RX_ENC_HE && 166 status->flag & RX_FLAG_RADIOTAP_HE) { 167 len = ALIGN(len, 2); 168 len += 12; 169 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12); 170 } 171 172 if (status->encoding == RX_ENC_HE && 173 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 174 len = ALIGN(len, 2); 175 len += 12; 176 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12); 177 } 178 179 if (status->flag & RX_FLAG_NO_PSDU) 180 len += 1; 181 182 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 183 len = ALIGN(len, 2); 184 len += 4; 185 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4); 186 } 187 188 if (status->chains) { 189 /* antenna and antenna signal fields */ 190 len += 2 * hweight8(status->chains); 191 } 192 193 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 194 struct ieee80211_vendor_radiotap *rtap; 195 int vendor_data_offset = 0; 196 197 /* 198 * The position to look at depends on the existence (or non- 199 * existence) of other elements, so take that into account... 200 */ 201 if (status->flag & RX_FLAG_RADIOTAP_HE) 202 vendor_data_offset += 203 sizeof(struct ieee80211_radiotap_he); 204 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 205 vendor_data_offset += 206 sizeof(struct ieee80211_radiotap_he_mu); 207 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 208 vendor_data_offset += 209 sizeof(struct ieee80211_radiotap_lsig); 210 211 rtap = (void *)&skb->data[vendor_data_offset]; 212 213 /* alignment for fixed 6-byte vendor data header */ 214 len = ALIGN(len, 2); 215 /* vendor data header */ 216 len += 6; 217 if (WARN_ON(rtap->align == 0)) 218 rtap->align = 1; 219 len = ALIGN(len, rtap->align); 220 len += rtap->len + rtap->pad; 221 } 222 223 return len; 224} 225 226static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, 227 struct sk_buff *skb, 228 int rtap_space) 229{ 230 struct { 231 struct ieee80211_hdr_3addr hdr; 232 u8 category; 233 u8 action_code; 234 } __packed __aligned(2) action; 235 236 if (!sdata) 237 return; 238 239 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1); 240 241 if (skb->len < rtap_space + sizeof(action) + 242 VHT_MUMIMO_GROUPS_DATA_LEN) 243 return; 244 245 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) 246 return; 247 248 skb_copy_bits(skb, rtap_space, &action, sizeof(action)); 249 250 if (!ieee80211_is_action(action.hdr.frame_control)) 251 return; 252 253 if (action.category != WLAN_CATEGORY_VHT) 254 return; 255 256 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) 257 return; 258 259 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) 260 return; 261 262 skb = skb_copy(skb, GFP_ATOMIC); 263 if (!skb) 264 return; 265 266 skb_queue_tail(&sdata->skb_queue, skb); 267 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 268} 269 270/* 271 * ieee80211_add_rx_radiotap_header - add radiotap header 272 * 273 * add a radiotap header containing all the fields which the hardware provided. 274 */ 275static void 276ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 277 struct sk_buff *skb, 278 struct ieee80211_rate *rate, 279 int rtap_len, bool has_fcs) 280{ 281 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 282 struct ieee80211_radiotap_header *rthdr; 283 unsigned char *pos; 284 __le32 *it_present; 285 u32 it_present_val; 286 u16 rx_flags = 0; 287 u16 channel_flags = 0; 288 int mpdulen, chain; 289 unsigned long chains = status->chains; 290 struct ieee80211_vendor_radiotap rtap = {}; 291 struct ieee80211_radiotap_he he = {}; 292 struct ieee80211_radiotap_he_mu he_mu = {}; 293 struct ieee80211_radiotap_lsig lsig = {}; 294 295 if (status->flag & RX_FLAG_RADIOTAP_HE) { 296 he = *(struct ieee80211_radiotap_he *)skb->data; 297 skb_pull(skb, sizeof(he)); 298 WARN_ON_ONCE(status->encoding != RX_ENC_HE); 299 } 300 301 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { 302 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; 303 skb_pull(skb, sizeof(he_mu)); 304 } 305 306 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 307 lsig = *(struct ieee80211_radiotap_lsig *)skb->data; 308 skb_pull(skb, sizeof(lsig)); 309 } 310 311 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 312 rtap = *(struct ieee80211_vendor_radiotap *)skb->data; 313 /* rtap.len and rtap.pad are undone immediately */ 314 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad); 315 } 316 317 mpdulen = skb->len; 318 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 319 mpdulen += FCS_LEN; 320 321 rthdr = skb_push(skb, rtap_len); 322 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad); 323 it_present = &rthdr->it_present; 324 325 /* radiotap header, set always present flags */ 326 rthdr->it_len = cpu_to_le16(rtap_len); 327 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 328 BIT(IEEE80211_RADIOTAP_CHANNEL) | 329 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 330 331 if (!status->chains) 332 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 333 334 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 335 it_present_val |= 336 BIT(IEEE80211_RADIOTAP_EXT) | 337 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 338 put_unaligned_le32(it_present_val, it_present); 339 it_present++; 340 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 341 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 342 } 343 344 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 345 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | 346 BIT(IEEE80211_RADIOTAP_EXT); 347 put_unaligned_le32(it_present_val, it_present); 348 it_present++; 349 it_present_val = rtap.present; 350 } 351 352 put_unaligned_le32(it_present_val, it_present); 353 354 pos = (void *)(it_present + 1); 355 356 /* the order of the following fields is important */ 357 358 /* IEEE80211_RADIOTAP_TSFT */ 359 if (ieee80211_have_rx_timestamp(status)) { 360 /* padding */ 361 while ((pos - (u8 *)rthdr) & 7) 362 *pos++ = 0; 363 put_unaligned_le64( 364 ieee80211_calculate_rx_timestamp(local, status, 365 mpdulen, 0), 366 pos); 367 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 368 pos += 8; 369 } 370 371 /* IEEE80211_RADIOTAP_FLAGS */ 372 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 373 *pos |= IEEE80211_RADIOTAP_F_FCS; 374 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 375 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 376 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) 377 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 378 pos++; 379 380 /* IEEE80211_RADIOTAP_RATE */ 381 if (!rate || status->encoding != RX_ENC_LEGACY) { 382 /* 383 * Without rate information don't add it. If we have, 384 * MCS information is a separate field in radiotap, 385 * added below. The byte here is needed as padding 386 * for the channel though, so initialise it to 0. 387 */ 388 *pos = 0; 389 } else { 390 int shift = 0; 391 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 392 if (status->bw == RATE_INFO_BW_10) 393 shift = 1; 394 else if (status->bw == RATE_INFO_BW_5) 395 shift = 2; 396 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 397 } 398 pos++; 399 400 /* IEEE80211_RADIOTAP_CHANNEL */ 401 /* TODO: frequency offset in KHz */ 402 put_unaligned_le16(status->freq, pos); 403 pos += 2; 404 if (status->bw == RATE_INFO_BW_10) 405 channel_flags |= IEEE80211_CHAN_HALF; 406 else if (status->bw == RATE_INFO_BW_5) 407 channel_flags |= IEEE80211_CHAN_QUARTER; 408 409 if (status->band == NL80211_BAND_5GHZ || 410 status->band == NL80211_BAND_6GHZ) 411 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 412 else if (status->encoding != RX_ENC_LEGACY) 413 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 414 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 415 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 416 else if (rate) 417 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 418 else 419 channel_flags |= IEEE80211_CHAN_2GHZ; 420 put_unaligned_le16(channel_flags, pos); 421 pos += 2; 422 423 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 424 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 425 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 426 *pos = status->signal; 427 rthdr->it_present |= 428 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 429 pos++; 430 } 431 432 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 433 434 if (!status->chains) { 435 /* IEEE80211_RADIOTAP_ANTENNA */ 436 *pos = status->antenna; 437 pos++; 438 } 439 440 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 441 442 /* IEEE80211_RADIOTAP_RX_FLAGS */ 443 /* ensure 2 byte alignment for the 2 byte field as required */ 444 if ((pos - (u8 *)rthdr) & 1) 445 *pos++ = 0; 446 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 447 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 448 put_unaligned_le16(rx_flags, pos); 449 pos += 2; 450 451 if (status->encoding == RX_ENC_HT) { 452 unsigned int stbc; 453 454 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 455 *pos++ = local->hw.radiotap_mcs_details; 456 *pos = 0; 457 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 458 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 459 if (status->bw == RATE_INFO_BW_40) 460 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 461 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 462 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 463 if (status->enc_flags & RX_ENC_FLAG_LDPC) 464 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 465 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; 466 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 467 pos++; 468 *pos++ = status->rate_idx; 469 } 470 471 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 472 u16 flags = 0; 473 474 /* ensure 4 byte alignment */ 475 while ((pos - (u8 *)rthdr) & 3) 476 pos++; 477 rthdr->it_present |= 478 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); 479 put_unaligned_le32(status->ampdu_reference, pos); 480 pos += 4; 481 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 482 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 483 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 484 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 485 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 486 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 487 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 488 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; 489 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) 490 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; 491 if (status->flag & RX_FLAG_AMPDU_EOF_BIT) 492 flags |= IEEE80211_RADIOTAP_AMPDU_EOF; 493 put_unaligned_le16(flags, pos); 494 pos += 2; 495 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 496 *pos++ = status->ampdu_delimiter_crc; 497 else 498 *pos++ = 0; 499 *pos++ = 0; 500 } 501 502 if (status->encoding == RX_ENC_VHT) { 503 u16 known = local->hw.radiotap_vht_details; 504 505 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 506 put_unaligned_le16(known, pos); 507 pos += 2; 508 /* flags */ 509 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 510 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 511 /* in VHT, STBC is binary */ 512 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) 513 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 514 if (status->enc_flags & RX_ENC_FLAG_BF) 515 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 516 pos++; 517 /* bandwidth */ 518 switch (status->bw) { 519 case RATE_INFO_BW_80: 520 *pos++ = 4; 521 break; 522 case RATE_INFO_BW_160: 523 *pos++ = 11; 524 break; 525 case RATE_INFO_BW_40: 526 *pos++ = 1; 527 break; 528 default: 529 *pos++ = 0; 530 } 531 /* MCS/NSS */ 532 *pos = (status->rate_idx << 4) | status->nss; 533 pos += 4; 534 /* coding field */ 535 if (status->enc_flags & RX_ENC_FLAG_LDPC) 536 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 537 pos++; 538 /* group ID */ 539 pos++; 540 /* partial_aid */ 541 pos += 2; 542 } 543 544 if (local->hw.radiotap_timestamp.units_pos >= 0) { 545 u16 accuracy = 0; 546 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; 547 548 rthdr->it_present |= 549 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP); 550 551 /* ensure 8 byte alignment */ 552 while ((pos - (u8 *)rthdr) & 7) 553 pos++; 554 555 put_unaligned_le64(status->device_timestamp, pos); 556 pos += sizeof(u64); 557 558 if (local->hw.radiotap_timestamp.accuracy >= 0) { 559 accuracy = local->hw.radiotap_timestamp.accuracy; 560 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; 561 } 562 put_unaligned_le16(accuracy, pos); 563 pos += sizeof(u16); 564 565 *pos++ = local->hw.radiotap_timestamp.units_pos; 566 *pos++ = flags; 567 } 568 569 if (status->encoding == RX_ENC_HE && 570 status->flag & RX_FLAG_RADIOTAP_HE) { 571#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) 572 573 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { 574 he.data6 |= HE_PREP(DATA6_NSTS, 575 FIELD_GET(RX_ENC_FLAG_STBC_MASK, 576 status->enc_flags)); 577 he.data3 |= HE_PREP(DATA3_STBC, 1); 578 } else { 579 he.data6 |= HE_PREP(DATA6_NSTS, status->nss); 580 } 581 582#define CHECK_GI(s) \ 583 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ 584 (int)NL80211_RATE_INFO_HE_GI_##s) 585 586 CHECK_GI(0_8); 587 CHECK_GI(1_6); 588 CHECK_GI(3_2); 589 590 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); 591 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); 592 he.data3 |= HE_PREP(DATA3_CODING, 593 !!(status->enc_flags & RX_ENC_FLAG_LDPC)); 594 595 he.data5 |= HE_PREP(DATA5_GI, status->he_gi); 596 597 switch (status->bw) { 598 case RATE_INFO_BW_20: 599 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 600 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); 601 break; 602 case RATE_INFO_BW_40: 603 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 604 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); 605 break; 606 case RATE_INFO_BW_80: 607 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 608 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); 609 break; 610 case RATE_INFO_BW_160: 611 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 612 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); 613 break; 614 case RATE_INFO_BW_HE_RU: 615#define CHECK_RU_ALLOC(s) \ 616 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ 617 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) 618 619 CHECK_RU_ALLOC(26); 620 CHECK_RU_ALLOC(52); 621 CHECK_RU_ALLOC(106); 622 CHECK_RU_ALLOC(242); 623 CHECK_RU_ALLOC(484); 624 CHECK_RU_ALLOC(996); 625 CHECK_RU_ALLOC(2x996); 626 627 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 628 status->he_ru + 4); 629 break; 630 default: 631 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); 632 } 633 634 /* ensure 2 byte alignment */ 635 while ((pos - (u8 *)rthdr) & 1) 636 pos++; 637 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE); 638 memcpy(pos, &he, sizeof(he)); 639 pos += sizeof(he); 640 } 641 642 if (status->encoding == RX_ENC_HE && 643 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 644 /* ensure 2 byte alignment */ 645 while ((pos - (u8 *)rthdr) & 1) 646 pos++; 647 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU); 648 memcpy(pos, &he_mu, sizeof(he_mu)); 649 pos += sizeof(he_mu); 650 } 651 652 if (status->flag & RX_FLAG_NO_PSDU) { 653 rthdr->it_present |= 654 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU); 655 *pos++ = status->zero_length_psdu_type; 656 } 657 658 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 659 /* ensure 2 byte alignment */ 660 while ((pos - (u8 *)rthdr) & 1) 661 pos++; 662 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG); 663 memcpy(pos, &lsig, sizeof(lsig)); 664 pos += sizeof(lsig); 665 } 666 667 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 668 *pos++ = status->chain_signal[chain]; 669 *pos++ = chain; 670 } 671 672 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 673 /* ensure 2 byte alignment for the vendor field as required */ 674 if ((pos - (u8 *)rthdr) & 1) 675 *pos++ = 0; 676 *pos++ = rtap.oui[0]; 677 *pos++ = rtap.oui[1]; 678 *pos++ = rtap.oui[2]; 679 *pos++ = rtap.subns; 680 put_unaligned_le16(rtap.len, pos); 681 pos += 2; 682 /* align the actual payload as requested */ 683 while ((pos - (u8 *)rthdr) & (rtap.align - 1)) 684 *pos++ = 0; 685 /* data (and possible padding) already follows */ 686 } 687} 688 689static struct sk_buff * 690ieee80211_make_monitor_skb(struct ieee80211_local *local, 691 struct sk_buff **origskb, 692 struct ieee80211_rate *rate, 693 int rtap_space, bool use_origskb) 694{ 695 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); 696 int rt_hdrlen, needed_headroom; 697 struct sk_buff *skb; 698 699 /* room for the radiotap header based on driver features */ 700 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); 701 needed_headroom = rt_hdrlen - rtap_space; 702 703 if (use_origskb) { 704 /* only need to expand headroom if necessary */ 705 skb = *origskb; 706 *origskb = NULL; 707 708 /* 709 * This shouldn't trigger often because most devices have an 710 * RX header they pull before we get here, and that should 711 * be big enough for our radiotap information. We should 712 * probably export the length to drivers so that we can have 713 * them allocate enough headroom to start with. 714 */ 715 if (skb_headroom(skb) < needed_headroom && 716 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 717 dev_kfree_skb(skb); 718 return NULL; 719 } 720 } else { 721 /* 722 * Need to make a copy and possibly remove radiotap header 723 * and FCS from the original. 724 */ 725 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC); 726 727 if (!skb) 728 return NULL; 729 } 730 731 /* prepend radiotap information */ 732 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 733 734 skb_reset_mac_header(skb); 735 skb->ip_summed = CHECKSUM_UNNECESSARY; 736 skb->pkt_type = PACKET_OTHERHOST; 737 skb->protocol = htons(ETH_P_802_2); 738 739 return skb; 740} 741 742/* 743 * This function copies a received frame to all monitor interfaces and 744 * returns a cleaned-up SKB that no longer includes the FCS nor the 745 * radiotap header the driver might have added. 746 */ 747static struct sk_buff * 748ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 749 struct ieee80211_rate *rate) 750{ 751 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 752 struct ieee80211_sub_if_data *sdata; 753 struct sk_buff *monskb = NULL; 754 int present_fcs_len = 0; 755 unsigned int rtap_space = 0; 756 struct ieee80211_sub_if_data *monitor_sdata = 757 rcu_dereference(local->monitor_sdata); 758 bool only_monitor = false; 759 unsigned int min_head_len; 760 761 if (status->flag & RX_FLAG_RADIOTAP_HE) 762 rtap_space += sizeof(struct ieee80211_radiotap_he); 763 764 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 765 rtap_space += sizeof(struct ieee80211_radiotap_he_mu); 766 767 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 768 rtap_space += sizeof(struct ieee80211_radiotap_lsig); 769 770 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) { 771 struct ieee80211_vendor_radiotap *rtap = 772 (void *)(origskb->data + rtap_space); 773 774 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad; 775 } 776 777 min_head_len = rtap_space; 778 779 /* 780 * First, we may need to make a copy of the skb because 781 * (1) we need to modify it for radiotap (if not present), and 782 * (2) the other RX handlers will modify the skb we got. 783 * 784 * We don't need to, of course, if we aren't going to return 785 * the SKB because it has a bad FCS/PLCP checksum. 786 */ 787 788 if (!(status->flag & RX_FLAG_NO_PSDU)) { 789 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 790 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { 791 /* driver bug */ 792 WARN_ON(1); 793 dev_kfree_skb(origskb); 794 return NULL; 795 } 796 present_fcs_len = FCS_LEN; 797 } 798 799 /* also consider the hdr->frame_control */ 800 min_head_len += 2; 801 } 802 803 /* ensure that the expected data elements are in skb head */ 804 if (!pskb_may_pull(origskb, min_head_len)) { 805 dev_kfree_skb(origskb); 806 return NULL; 807 } 808 809 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); 810 811 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { 812 if (only_monitor) { 813 dev_kfree_skb(origskb); 814 return NULL; 815 } 816 817 return ieee80211_clean_skb(origskb, present_fcs_len, 818 rtap_space); 819 } 820 821 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); 822 823 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { 824 bool last_monitor = list_is_last(&sdata->u.mntr.list, 825 &local->mon_list); 826 827 if (!monskb) 828 monskb = ieee80211_make_monitor_skb(local, &origskb, 829 rate, rtap_space, 830 only_monitor && 831 last_monitor); 832 833 if (monskb) { 834 struct sk_buff *skb; 835 836 if (last_monitor) { 837 skb = monskb; 838 monskb = NULL; 839 } else { 840 skb = skb_clone(monskb, GFP_ATOMIC); 841 } 842 843 if (skb) { 844 skb->dev = sdata->dev; 845 ieee80211_rx_stats(skb->dev, skb->len); 846 netif_receive_skb(skb); 847 } 848 } 849 850 if (last_monitor) 851 break; 852 } 853 854 /* this happens if last_monitor was erroneously false */ 855 dev_kfree_skb(monskb); 856 857 /* ditto */ 858 if (!origskb) 859 return NULL; 860 861 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space); 862} 863 864static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 865{ 866 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 867 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 868 int tid, seqno_idx, security_idx; 869 870 /* does the frame have a qos control field? */ 871 if (ieee80211_is_data_qos(hdr->frame_control)) { 872 u8 *qc = ieee80211_get_qos_ctl(hdr); 873 /* frame has qos control */ 874 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 875 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 876 status->rx_flags |= IEEE80211_RX_AMSDU; 877 878 seqno_idx = tid; 879 security_idx = tid; 880 } else { 881 /* 882 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 883 * 884 * Sequence numbers for management frames, QoS data 885 * frames with a broadcast/multicast address in the 886 * Address 1 field, and all non-QoS data frames sent 887 * by QoS STAs are assigned using an additional single 888 * modulo-4096 counter, [...] 889 * 890 * We also use that counter for non-QoS STAs. 891 */ 892 seqno_idx = IEEE80211_NUM_TIDS; 893 security_idx = 0; 894 if (ieee80211_is_mgmt(hdr->frame_control)) 895 security_idx = IEEE80211_NUM_TIDS; 896 tid = 0; 897 } 898 899 rx->seqno_idx = seqno_idx; 900 rx->security_idx = security_idx; 901 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 902 * For now, set skb->priority to 0 for other cases. */ 903 rx->skb->priority = (tid > 7) ? 0 : tid; 904} 905 906/** 907 * DOC: Packet alignment 908 * 909 * Drivers always need to pass packets that are aligned to two-byte boundaries 910 * to the stack. 911 * 912 * Additionally, should, if possible, align the payload data in a way that 913 * guarantees that the contained IP header is aligned to a four-byte 914 * boundary. In the case of regular frames, this simply means aligning the 915 * payload to a four-byte boundary (because either the IP header is directly 916 * contained, or IV/RFC1042 headers that have a length divisible by four are 917 * in front of it). If the payload data is not properly aligned and the 918 * architecture doesn't support efficient unaligned operations, mac80211 919 * will align the data. 920 * 921 * With A-MSDU frames, however, the payload data address must yield two modulo 922 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 923 * push the IP header further back to a multiple of four again. Thankfully, the 924 * specs were sane enough this time around to require padding each A-MSDU 925 * subframe to a length that is a multiple of four. 926 * 927 * Padding like Atheros hardware adds which is between the 802.11 header and 928 * the payload is not supported, the driver is required to move the 802.11 929 * header to be directly in front of the payload in that case. 930 */ 931static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 932{ 933#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 934 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 935#endif 936} 937 938 939/* rx handlers */ 940 941static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 942{ 943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 944 945 if (is_multicast_ether_addr(hdr->addr1)) 946 return 0; 947 948 return ieee80211_is_robust_mgmt_frame(skb); 949} 950 951 952static int ieee80211_is_multicast_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/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 964static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 965{ 966 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 967 struct ieee80211_mmie *mmie; 968 struct ieee80211_mmie_16 *mmie16; 969 970 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 971 return -1; 972 973 if (!ieee80211_is_robust_mgmt_frame(skb) && 974 !ieee80211_is_beacon(hdr->frame_control)) 975 return -1; /* not a robust management frame */ 976 977 mmie = (struct ieee80211_mmie *) 978 (skb->data + skb->len - sizeof(*mmie)); 979 if (mmie->element_id == WLAN_EID_MMIE && 980 mmie->length == sizeof(*mmie) - 2) 981 return le16_to_cpu(mmie->key_id); 982 983 mmie16 = (struct ieee80211_mmie_16 *) 984 (skb->data + skb->len - sizeof(*mmie16)); 985 if (skb->len >= 24 + sizeof(*mmie16) && 986 mmie16->element_id == WLAN_EID_MMIE && 987 mmie16->length == sizeof(*mmie16) - 2) 988 return le16_to_cpu(mmie16->key_id); 989 990 return -1; 991} 992 993static int ieee80211_get_keyid(struct sk_buff *skb, 994 const struct ieee80211_cipher_scheme *cs) 995{ 996 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 997 __le16 fc; 998 int hdrlen; 999 int minlen; 1000 u8 key_idx_off; 1001 u8 key_idx_shift; 1002 u8 keyid; 1003 1004 fc = hdr->frame_control; 1005 hdrlen = ieee80211_hdrlen(fc); 1006 1007 if (cs) { 1008 minlen = hdrlen + cs->hdr_len; 1009 key_idx_off = hdrlen + cs->key_idx_off; 1010 key_idx_shift = cs->key_idx_shift; 1011 } else { 1012 /* WEP, TKIP, CCMP and GCMP */ 1013 minlen = hdrlen + IEEE80211_WEP_IV_LEN; 1014 key_idx_off = hdrlen + 3; 1015 key_idx_shift = 6; 1016 } 1017 1018 if (unlikely(skb->len < minlen)) 1019 return -EINVAL; 1020 1021 skb_copy_bits(skb, key_idx_off, &keyid, 1); 1022 1023 if (cs) 1024 keyid &= cs->key_idx_mask; 1025 keyid >>= key_idx_shift; 1026 1027 /* cs could use more than the usual two bits for the keyid */ 1028 if (unlikely(keyid >= NUM_DEFAULT_KEYS)) 1029 return -EINVAL; 1030 1031 return keyid; 1032} 1033 1034static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 1035{ 1036 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1037 char *dev_addr = rx->sdata->vif.addr; 1038 1039 if (ieee80211_is_data(hdr->frame_control)) { 1040 if (is_multicast_ether_addr(hdr->addr1)) { 1041 if (ieee80211_has_tods(hdr->frame_control) || 1042 !ieee80211_has_fromds(hdr->frame_control)) 1043 return RX_DROP_MONITOR; 1044 if (ether_addr_equal(hdr->addr3, dev_addr)) 1045 return RX_DROP_MONITOR; 1046 } else { 1047 if (!ieee80211_has_a4(hdr->frame_control)) 1048 return RX_DROP_MONITOR; 1049 if (ether_addr_equal(hdr->addr4, dev_addr)) 1050 return RX_DROP_MONITOR; 1051 } 1052 } 1053 1054 /* If there is not an established peer link and this is not a peer link 1055 * establisment frame, beacon or probe, drop the frame. 1056 */ 1057 1058 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 1059 struct ieee80211_mgmt *mgmt; 1060 1061 if (!ieee80211_is_mgmt(hdr->frame_control)) 1062 return RX_DROP_MONITOR; 1063 1064 if (ieee80211_is_action(hdr->frame_control)) { 1065 u8 category; 1066 1067 /* make sure category field is present */ 1068 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 1069 return RX_DROP_MONITOR; 1070 1071 mgmt = (struct ieee80211_mgmt *)hdr; 1072 category = mgmt->u.action.category; 1073 if (category != WLAN_CATEGORY_MESH_ACTION && 1074 category != WLAN_CATEGORY_SELF_PROTECTED) 1075 return RX_DROP_MONITOR; 1076 return RX_CONTINUE; 1077 } 1078 1079 if (ieee80211_is_probe_req(hdr->frame_control) || 1080 ieee80211_is_probe_resp(hdr->frame_control) || 1081 ieee80211_is_beacon(hdr->frame_control) || 1082 ieee80211_is_auth(hdr->frame_control)) 1083 return RX_CONTINUE; 1084 1085 return RX_DROP_MONITOR; 1086 } 1087 1088 return RX_CONTINUE; 1089} 1090 1091static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, 1092 int index) 1093{ 1094 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index]; 1095 struct sk_buff *tail = skb_peek_tail(frames); 1096 struct ieee80211_rx_status *status; 1097 1098 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) 1099 return true; 1100 1101 if (!tail) 1102 return false; 1103 1104 status = IEEE80211_SKB_RXCB(tail); 1105 if (status->flag & RX_FLAG_AMSDU_MORE) 1106 return false; 1107 1108 return true; 1109} 1110 1111static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 1112 struct tid_ampdu_rx *tid_agg_rx, 1113 int index, 1114 struct sk_buff_head *frames) 1115{ 1116 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; 1117 struct sk_buff *skb; 1118 struct ieee80211_rx_status *status; 1119 1120 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1121 1122 if (skb_queue_empty(skb_list)) 1123 goto no_frame; 1124 1125 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1126 __skb_queue_purge(skb_list); 1127 goto no_frame; 1128 } 1129 1130 /* release frames from the reorder ring buffer */ 1131 tid_agg_rx->stored_mpdu_num--; 1132 while ((skb = __skb_dequeue(skb_list))) { 1133 status = IEEE80211_SKB_RXCB(skb); 1134 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 1135 __skb_queue_tail(frames, skb); 1136 } 1137 1138no_frame: 1139 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 1140 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1141} 1142 1143static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 1144 struct tid_ampdu_rx *tid_agg_rx, 1145 u16 head_seq_num, 1146 struct sk_buff_head *frames) 1147{ 1148 int index; 1149 1150 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1151 1152 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 1153 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1154 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1155 frames); 1156 } 1157} 1158 1159/* 1160 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 1161 * the skb was added to the buffer longer than this time ago, the earlier 1162 * frames that have not yet been received are assumed to be lost and the skb 1163 * can be released for processing. This may also release other skb's from the 1164 * reorder buffer if there are no additional gaps between the frames. 1165 * 1166 * Callers must hold tid_agg_rx->reorder_lock. 1167 */ 1168#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 1169 1170static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 1171 struct tid_ampdu_rx *tid_agg_rx, 1172 struct sk_buff_head *frames) 1173{ 1174 int index, i, j; 1175 1176 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1177 1178 /* release the buffer until next missing frame */ 1179 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1180 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && 1181 tid_agg_rx->stored_mpdu_num) { 1182 /* 1183 * No buffers ready to be released, but check whether any 1184 * frames in the reorder buffer have timed out. 1185 */ 1186 int skipped = 1; 1187 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 1188 j = (j + 1) % tid_agg_rx->buf_size) { 1189 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { 1190 skipped++; 1191 continue; 1192 } 1193 if (skipped && 1194 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 1195 HT_RX_REORDER_BUF_TIMEOUT)) 1196 goto set_release_timer; 1197 1198 /* don't leave incomplete A-MSDUs around */ 1199 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 1200 i = (i + 1) % tid_agg_rx->buf_size) 1201 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]); 1202 1203 ht_dbg_ratelimited(sdata, 1204 "release an RX reorder frame due to timeout on earlier frames\n"); 1205 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 1206 frames); 1207 1208 /* 1209 * Increment the head seq# also for the skipped slots. 1210 */ 1211 tid_agg_rx->head_seq_num = 1212 (tid_agg_rx->head_seq_num + 1213 skipped) & IEEE80211_SN_MASK; 1214 skipped = 0; 1215 } 1216 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1217 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1218 frames); 1219 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1220 } 1221 1222 if (tid_agg_rx->stored_mpdu_num) { 1223 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1224 1225 for (; j != (index - 1) % tid_agg_rx->buf_size; 1226 j = (j + 1) % tid_agg_rx->buf_size) { 1227 if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) 1228 break; 1229 } 1230 1231 set_release_timer: 1232 1233 if (!tid_agg_rx->removed) 1234 mod_timer(&tid_agg_rx->reorder_timer, 1235 tid_agg_rx->reorder_time[j] + 1 + 1236 HT_RX_REORDER_BUF_TIMEOUT); 1237 } else { 1238 del_timer(&tid_agg_rx->reorder_timer); 1239 } 1240} 1241 1242/* 1243 * As this function belongs to the RX path it must be under 1244 * rcu_read_lock protection. It returns false if the frame 1245 * can be processed immediately, true if it was consumed. 1246 */ 1247static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 1248 struct tid_ampdu_rx *tid_agg_rx, 1249 struct sk_buff *skb, 1250 struct sk_buff_head *frames) 1251{ 1252 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1253 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1254 u16 sc = le16_to_cpu(hdr->seq_ctrl); 1255 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 1256 u16 head_seq_num, buf_size; 1257 int index; 1258 bool ret = true; 1259 1260 spin_lock(&tid_agg_rx->reorder_lock); 1261 1262 /* 1263 * Offloaded BA sessions have no known starting sequence number so pick 1264 * one from first Rxed frame for this tid after BA was started. 1265 */ 1266 if (unlikely(tid_agg_rx->auto_seq)) { 1267 tid_agg_rx->auto_seq = false; 1268 tid_agg_rx->ssn = mpdu_seq_num; 1269 tid_agg_rx->head_seq_num = mpdu_seq_num; 1270 } 1271 1272 buf_size = tid_agg_rx->buf_size; 1273 head_seq_num = tid_agg_rx->head_seq_num; 1274 1275 /* 1276 * If the current MPDU's SN is smaller than the SSN, it shouldn't 1277 * be reordered. 1278 */ 1279 if (unlikely(!tid_agg_rx->started)) { 1280 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1281 ret = false; 1282 goto out; 1283 } 1284 tid_agg_rx->started = true; 1285 } 1286 1287 /* frame with out of date sequence number */ 1288 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1289 dev_kfree_skb(skb); 1290 goto out; 1291 } 1292 1293 /* 1294 * If frame the sequence number exceeds our buffering window 1295 * size release some previous frames to make room for this one. 1296 */ 1297 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 1298 head_seq_num = ieee80211_sn_inc( 1299 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 1300 /* release stored frames up to new head to stack */ 1301 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 1302 head_seq_num, frames); 1303 } 1304 1305 /* Now the new frame is always in the range of the reordering buffer */ 1306 1307 index = mpdu_seq_num % tid_agg_rx->buf_size; 1308 1309 /* check if we already stored this frame */ 1310 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1311 dev_kfree_skb(skb); 1312 goto out; 1313 } 1314 1315 /* 1316 * If the current MPDU is in the right order and nothing else 1317 * is stored we can process it directly, no need to buffer it. 1318 * If it is first but there's something stored, we may be able 1319 * to release frames after this one. 1320 */ 1321 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1322 tid_agg_rx->stored_mpdu_num == 0) { 1323 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1324 tid_agg_rx->head_seq_num = 1325 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1326 ret = false; 1327 goto out; 1328 } 1329 1330 /* put the frame in the reordering buffer */ 1331 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); 1332 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1333 tid_agg_rx->reorder_time[index] = jiffies; 1334 tid_agg_rx->stored_mpdu_num++; 1335 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1336 } 1337 1338 out: 1339 spin_unlock(&tid_agg_rx->reorder_lock); 1340 return ret; 1341} 1342 1343/* 1344 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1345 * true if the MPDU was buffered, false if it should be processed. 1346 */ 1347static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1348 struct sk_buff_head *frames) 1349{ 1350 struct sk_buff *skb = rx->skb; 1351 struct ieee80211_local *local = rx->local; 1352 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1353 struct sta_info *sta = rx->sta; 1354 struct tid_ampdu_rx *tid_agg_rx; 1355 u16 sc; 1356 u8 tid, ack_policy; 1357 1358 if (!ieee80211_is_data_qos(hdr->frame_control) || 1359 is_multicast_ether_addr(hdr->addr1)) 1360 goto dont_reorder; 1361 1362 /* 1363 * filter the QoS data rx stream according to 1364 * STA/TID and check if this STA/TID is on aggregation 1365 */ 1366 1367 if (!sta) 1368 goto dont_reorder; 1369 1370 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1371 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1372 tid = ieee80211_get_tid(hdr); 1373 1374 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1375 if (!tid_agg_rx) { 1376 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1377 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1378 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1379 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1380 WLAN_BACK_RECIPIENT, 1381 WLAN_REASON_QSTA_REQUIRE_SETUP); 1382 goto dont_reorder; 1383 } 1384 1385 /* qos null data frames are excluded */ 1386 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1387 goto dont_reorder; 1388 1389 /* not part of a BA session */ 1390 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 1391 goto dont_reorder; 1392 1393 /* new, potentially un-ordered, ampdu frame - process it */ 1394 1395 /* reset session timer */ 1396 if (tid_agg_rx->timeout) 1397 tid_agg_rx->last_rx = jiffies; 1398 1399 /* if this mpdu is fragmented - terminate rx aggregation session */ 1400 sc = le16_to_cpu(hdr->seq_ctrl); 1401 if (sc & IEEE80211_SCTL_FRAG) { 1402 skb_queue_tail(&rx->sdata->skb_queue, skb); 1403 ieee80211_queue_work(&local->hw, &rx->sdata->work); 1404 return; 1405 } 1406 1407 /* 1408 * No locking needed -- we will only ever process one 1409 * RX packet at a time, and thus own tid_agg_rx. All 1410 * other code manipulating it needs to (and does) make 1411 * sure that we cannot get to it any more before doing 1412 * anything with it. 1413 */ 1414 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1415 frames)) 1416 return; 1417 1418 dont_reorder: 1419 __skb_queue_tail(frames, skb); 1420} 1421 1422static ieee80211_rx_result debug_noinline 1423ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1424{ 1425 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1426 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1427 1428 if (status->flag & RX_FLAG_DUP_VALIDATED) 1429 return RX_CONTINUE; 1430 1431 /* 1432 * Drop duplicate 802.11 retransmissions 1433 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1434 */ 1435 1436 if (rx->skb->len < 24) 1437 return RX_CONTINUE; 1438 1439 if (ieee80211_is_ctl(hdr->frame_control) || 1440 ieee80211_is_any_nullfunc(hdr->frame_control) || 1441 is_multicast_ether_addr(hdr->addr1)) 1442 return RX_CONTINUE; 1443 1444 if (!rx->sta) 1445 return RX_CONTINUE; 1446 1447 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1448 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1449 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1450 rx->sta->rx_stats.num_duplicates++; 1451 return RX_DROP_UNUSABLE; 1452 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1453 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1454 } 1455 1456 return RX_CONTINUE; 1457} 1458 1459static ieee80211_rx_result debug_noinline 1460ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1461{ 1462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1463 1464 /* Drop disallowed frame classes based on STA auth/assoc state; 1465 * IEEE 802.11, Chap 5.5. 1466 * 1467 * mac80211 filters only based on association state, i.e. it drops 1468 * Class 3 frames from not associated stations. hostapd sends 1469 * deauth/disassoc frames when needed. In addition, hostapd is 1470 * responsible for filtering on both auth and assoc states. 1471 */ 1472 1473 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1474 return ieee80211_rx_mesh_check(rx); 1475 1476 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1477 ieee80211_is_pspoll(hdr->frame_control)) && 1478 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1479 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 1480 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1481 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1482 /* 1483 * accept port control frames from the AP even when it's not 1484 * yet marked ASSOC to prevent a race where we don't set the 1485 * assoc bit quickly enough before it sends the first frame 1486 */ 1487 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1488 ieee80211_is_data_present(hdr->frame_control)) { 1489 unsigned int hdrlen; 1490 __be16 ethertype; 1491 1492 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1493 1494 if (rx->skb->len < hdrlen + 8) 1495 return RX_DROP_MONITOR; 1496 1497 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1498 if (ethertype == rx->sdata->control_port_protocol) 1499 return RX_CONTINUE; 1500 } 1501 1502 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1503 cfg80211_rx_spurious_frame(rx->sdata->dev, 1504 hdr->addr2, 1505 GFP_ATOMIC)) 1506 return RX_DROP_UNUSABLE; 1507 1508 return RX_DROP_MONITOR; 1509 } 1510 1511 return RX_CONTINUE; 1512} 1513 1514 1515static ieee80211_rx_result debug_noinline 1516ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1517{ 1518 struct ieee80211_local *local; 1519 struct ieee80211_hdr *hdr; 1520 struct sk_buff *skb; 1521 1522 local = rx->local; 1523 skb = rx->skb; 1524 hdr = (struct ieee80211_hdr *) skb->data; 1525 1526 if (!local->pspolling) 1527 return RX_CONTINUE; 1528 1529 if (!ieee80211_has_fromds(hdr->frame_control)) 1530 /* this is not from AP */ 1531 return RX_CONTINUE; 1532 1533 if (!ieee80211_is_data(hdr->frame_control)) 1534 return RX_CONTINUE; 1535 1536 if (!ieee80211_has_moredata(hdr->frame_control)) { 1537 /* AP has no more frames buffered for us */ 1538 local->pspolling = false; 1539 return RX_CONTINUE; 1540 } 1541 1542 /* more data bit is set, let's request a new frame from the AP */ 1543 ieee80211_send_pspoll(local, rx->sdata); 1544 1545 return RX_CONTINUE; 1546} 1547 1548static void sta_ps_start(struct sta_info *sta) 1549{ 1550 struct ieee80211_sub_if_data *sdata = sta->sdata; 1551 struct ieee80211_local *local = sdata->local; 1552 struct ps_data *ps; 1553 int tid; 1554 1555 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1556 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1557 ps = &sdata->bss->ps; 1558 else 1559 return; 1560 1561 atomic_inc(&ps->num_sta_ps); 1562 set_sta_flag(sta, WLAN_STA_PS_STA); 1563 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1564 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1565 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1566 sta->sta.addr, sta->sta.aid); 1567 1568 ieee80211_clear_fast_xmit(sta); 1569 1570 if (!sta->sta.txq[0]) 1571 return; 1572 1573 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1574 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1575 struct txq_info *txqi = to_txq_info(txq); 1576 1577 spin_lock(&local->active_txq_lock[txq->ac]); 1578 if (!list_empty(&txqi->schedule_order)) 1579 list_del_init(&txqi->schedule_order); 1580 spin_unlock(&local->active_txq_lock[txq->ac]); 1581 1582 if (txq_has_queue(txq)) 1583 set_bit(tid, &sta->txq_buffered_tids); 1584 else 1585 clear_bit(tid, &sta->txq_buffered_tids); 1586 } 1587} 1588 1589static void sta_ps_end(struct sta_info *sta) 1590{ 1591 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1592 sta->sta.addr, sta->sta.aid); 1593 1594 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1595 /* 1596 * Clear the flag only if the other one is still set 1597 * so that the TX path won't start TX'ing new frames 1598 * directly ... In the case that the driver flag isn't 1599 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1600 */ 1601 clear_sta_flag(sta, WLAN_STA_PS_STA); 1602 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1603 sta->sta.addr, sta->sta.aid); 1604 return; 1605 } 1606 1607 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1608 clear_sta_flag(sta, WLAN_STA_PS_STA); 1609 ieee80211_sta_ps_deliver_wakeup(sta); 1610} 1611 1612int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1613{ 1614 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1615 bool in_ps; 1616 1617 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1618 1619 /* Don't let the same PS state be set twice */ 1620 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1621 if ((start && in_ps) || (!start && !in_ps)) 1622 return -EINVAL; 1623 1624 if (start) 1625 sta_ps_start(sta); 1626 else 1627 sta_ps_end(sta); 1628 1629 return 0; 1630} 1631EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1632 1633void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1634{ 1635 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1636 1637 if (test_sta_flag(sta, WLAN_STA_SP)) 1638 return; 1639 1640 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1641 ieee80211_sta_ps_deliver_poll_response(sta); 1642 else 1643 set_sta_flag(sta, WLAN_STA_PSPOLL); 1644} 1645EXPORT_SYMBOL(ieee80211_sta_pspoll); 1646 1647void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1648{ 1649 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1650 int ac = ieee80211_ac_from_tid(tid); 1651 1652 /* 1653 * If this AC is not trigger-enabled do nothing unless the 1654 * driver is calling us after it already checked. 1655 * 1656 * NB: This could/should check a separate bitmap of trigger- 1657 * enabled queues, but for now we only implement uAPSD w/o 1658 * TSPEC changes to the ACs, so they're always the same. 1659 */ 1660 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1661 tid != IEEE80211_NUM_TIDS) 1662 return; 1663 1664 /* if we are in a service period, do nothing */ 1665 if (test_sta_flag(sta, WLAN_STA_SP)) 1666 return; 1667 1668 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1669 ieee80211_sta_ps_deliver_uapsd(sta); 1670 else 1671 set_sta_flag(sta, WLAN_STA_UAPSD); 1672} 1673EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1674 1675static ieee80211_rx_result debug_noinline 1676ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1677{ 1678 struct ieee80211_sub_if_data *sdata = rx->sdata; 1679 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1680 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1681 1682 if (!rx->sta) 1683 return RX_CONTINUE; 1684 1685 if (sdata->vif.type != NL80211_IFTYPE_AP && 1686 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1687 return RX_CONTINUE; 1688 1689 /* 1690 * The device handles station powersave, so don't do anything about 1691 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1692 * it to mac80211 since they're handled.) 1693 */ 1694 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1695 return RX_CONTINUE; 1696 1697 /* 1698 * Don't do anything if the station isn't already asleep. In 1699 * the uAPSD case, the station will probably be marked asleep, 1700 * in the PS-Poll case the station must be confused ... 1701 */ 1702 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1703 return RX_CONTINUE; 1704 1705 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1706 ieee80211_sta_pspoll(&rx->sta->sta); 1707 1708 /* Free PS Poll skb here instead of returning RX_DROP that would 1709 * count as an dropped frame. */ 1710 dev_kfree_skb(rx->skb); 1711 1712 return RX_QUEUED; 1713 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1714 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1715 ieee80211_has_pm(hdr->frame_control) && 1716 (ieee80211_is_data_qos(hdr->frame_control) || 1717 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1718 u8 tid = ieee80211_get_tid(hdr); 1719 1720 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1721 } 1722 1723 return RX_CONTINUE; 1724} 1725 1726static ieee80211_rx_result debug_noinline 1727ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1728{ 1729 struct sta_info *sta = rx->sta; 1730 struct sk_buff *skb = rx->skb; 1731 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1732 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1733 int i; 1734 1735 if (!sta) 1736 return RX_CONTINUE; 1737 1738 /* 1739 * Update last_rx only for IBSS packets which are for the current 1740 * BSSID and for station already AUTHORIZED to avoid keeping the 1741 * current IBSS network alive in cases where other STAs start 1742 * using different BSSID. This will also give the station another 1743 * chance to restart the authentication/authorization in case 1744 * something went wrong the first time. 1745 */ 1746 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1747 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1748 NL80211_IFTYPE_ADHOC); 1749 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1750 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1751 sta->rx_stats.last_rx = jiffies; 1752 if (ieee80211_is_data(hdr->frame_control) && 1753 !is_multicast_ether_addr(hdr->addr1)) 1754 sta->rx_stats.last_rate = 1755 sta_stats_encode_rate(status); 1756 } 1757 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1758 sta->rx_stats.last_rx = jiffies; 1759 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1760 !is_multicast_ether_addr(hdr->addr1)) { 1761 /* 1762 * Mesh beacons will update last_rx when if they are found to 1763 * match the current local configuration when processed. 1764 */ 1765 sta->rx_stats.last_rx = jiffies; 1766 if (ieee80211_is_data(hdr->frame_control)) 1767 sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1768 } 1769 1770 sta->rx_stats.fragments++; 1771 1772 u64_stats_update_begin(&rx->sta->rx_stats.syncp); 1773 sta->rx_stats.bytes += rx->skb->len; 1774 u64_stats_update_end(&rx->sta->rx_stats.syncp); 1775 1776 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1777 sta->rx_stats.last_signal = status->signal; 1778 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal); 1779 } 1780 1781 if (status->chains) { 1782 sta->rx_stats.chains = status->chains; 1783 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1784 int signal = status->chain_signal[i]; 1785 1786 if (!(status->chains & BIT(i))) 1787 continue; 1788 1789 sta->rx_stats.chain_signal_last[i] = signal; 1790 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], 1791 -signal); 1792 } 1793 } 1794 1795 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1796 return RX_CONTINUE; 1797 1798 /* 1799 * Change STA power saving mode only at the end of a frame 1800 * exchange sequence, and only for a data or management 1801 * frame as specified in IEEE 802.11-2016 11.2.3.2 1802 */ 1803 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1804 !ieee80211_has_morefrags(hdr->frame_control) && 1805 !is_multicast_ether_addr(hdr->addr1) && 1806 (ieee80211_is_mgmt(hdr->frame_control) || 1807 ieee80211_is_data(hdr->frame_control)) && 1808 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1809 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1810 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1811 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1812 if (!ieee80211_has_pm(hdr->frame_control)) 1813 sta_ps_end(sta); 1814 } else { 1815 if (ieee80211_has_pm(hdr->frame_control)) 1816 sta_ps_start(sta); 1817 } 1818 } 1819 1820 /* mesh power save support */ 1821 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1822 ieee80211_mps_rx_h_sta_process(sta, hdr); 1823 1824 /* 1825 * Drop (qos-)data::nullfunc frames silently, since they 1826 * are used only to control station power saving mode. 1827 */ 1828 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1829 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1830 1831 /* 1832 * If we receive a 4-addr nullfunc frame from a STA 1833 * that was not moved to a 4-addr STA vlan yet send 1834 * the event to userspace and for older hostapd drop 1835 * the frame to the monitor interface. 1836 */ 1837 if (ieee80211_has_a4(hdr->frame_control) && 1838 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1839 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1840 !rx->sdata->u.vlan.sta))) { 1841 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1842 cfg80211_rx_unexpected_4addr_frame( 1843 rx->sdata->dev, sta->sta.addr, 1844 GFP_ATOMIC); 1845 return RX_DROP_MONITOR; 1846 } 1847 /* 1848 * Update counter and free packet here to avoid 1849 * counting this as a dropped packed. 1850 */ 1851 sta->rx_stats.packets++; 1852 dev_kfree_skb(rx->skb); 1853 return RX_QUEUED; 1854 } 1855 1856 return RX_CONTINUE; 1857} /* ieee80211_rx_h_sta_process */ 1858 1859static struct ieee80211_key * 1860ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1861{ 1862 struct ieee80211_key *key = NULL; 1863 struct ieee80211_sub_if_data *sdata = rx->sdata; 1864 int idx2; 1865 1866 /* Make sure key gets set if either BIGTK key index is set so that 1867 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1868 * Beacon frames and Beacon frames that claim to use another BIGTK key 1869 * index (i.e., a key that we do not have). 1870 */ 1871 1872 if (idx < 0) { 1873 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 1874 idx2 = idx + 1; 1875 } else { 1876 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1877 idx2 = idx + 1; 1878 else 1879 idx2 = idx - 1; 1880 } 1881 1882 if (rx->sta) 1883 key = rcu_dereference(rx->sta->gtk[idx]); 1884 if (!key) 1885 key = rcu_dereference(sdata->keys[idx]); 1886 if (!key && rx->sta) 1887 key = rcu_dereference(rx->sta->gtk[idx2]); 1888 if (!key) 1889 key = rcu_dereference(sdata->keys[idx2]); 1890 1891 return key; 1892} 1893 1894static ieee80211_rx_result debug_noinline 1895ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1896{ 1897 struct sk_buff *skb = rx->skb; 1898 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1899 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1900 int keyidx; 1901 ieee80211_rx_result result = RX_DROP_UNUSABLE; 1902 struct ieee80211_key *sta_ptk = NULL; 1903 struct ieee80211_key *ptk_idx = NULL; 1904 int mmie_keyidx = -1; 1905 __le16 fc; 1906 const struct ieee80211_cipher_scheme *cs = NULL; 1907 1908 if (ieee80211_is_ext(hdr->frame_control)) 1909 return RX_CONTINUE; 1910 1911 /* 1912 * Key selection 101 1913 * 1914 * There are five types of keys: 1915 * - GTK (group keys) 1916 * - IGTK (group keys for management frames) 1917 * - BIGTK (group keys for Beacon frames) 1918 * - PTK (pairwise keys) 1919 * - STK (station-to-station pairwise keys) 1920 * 1921 * When selecting a key, we have to distinguish between multicast 1922 * (including broadcast) and unicast frames, the latter can only 1923 * use PTKs and STKs while the former always use GTKs, IGTKs, and 1924 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 1925 * then unicast frames can also use key indices like GTKs. Hence, if we 1926 * don't have a PTK/STK we check the key index for a WEP key. 1927 * 1928 * Note that in a regular BSS, multicast frames are sent by the 1929 * AP only, associated stations unicast the frame to the AP first 1930 * which then multicasts it on their behalf. 1931 * 1932 * There is also a slight problem in IBSS mode: GTKs are negotiated 1933 * with each station, that is something we don't currently handle. 1934 * The spec seems to expect that one negotiates the same key with 1935 * every station but there's no such requirement; VLANs could be 1936 * possible. 1937 */ 1938 1939 /* start without a key */ 1940 rx->key = NULL; 1941 fc = hdr->frame_control; 1942 1943 if (rx->sta) { 1944 int keyid = rx->sta->ptk_idx; 1945 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1946 1947 if (ieee80211_has_protected(fc) && 1948 !(status->flag & RX_FLAG_IV_STRIPPED)) { 1949 cs = rx->sta->cipher_scheme; 1950 keyid = ieee80211_get_keyid(rx->skb, cs); 1951 1952 if (unlikely(keyid < 0)) 1953 return RX_DROP_UNUSABLE; 1954 1955 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 1956 } 1957 } 1958 1959 if (!ieee80211_has_protected(fc)) 1960 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1961 1962 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1963 rx->key = ptk_idx ? ptk_idx : sta_ptk; 1964 if ((status->flag & RX_FLAG_DECRYPTED) && 1965 (status->flag & RX_FLAG_IV_STRIPPED)) 1966 return RX_CONTINUE; 1967 /* Skip decryption if the frame is not protected. */ 1968 if (!ieee80211_has_protected(fc)) 1969 return RX_CONTINUE; 1970 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 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 + NUM_DEFAULT_MGMT_KEYS || 1977 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 1978 NUM_DEFAULT_BEACON_KEYS) { 1979 if (rx->sdata->dev) 1980 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1981 skb->data, 1982 skb->len); 1983 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1984 } 1985 1986 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 1987 if (!rx->key) 1988 return RX_CONTINUE; /* Beacon protection not in use */ 1989 } else if (mmie_keyidx >= 0) { 1990 /* Broadcast/multicast robust management frame / BIP */ 1991 if ((status->flag & RX_FLAG_DECRYPTED) && 1992 (status->flag & RX_FLAG_IV_STRIPPED)) 1993 return RX_CONTINUE; 1994 1995 if (mmie_keyidx < NUM_DEFAULT_KEYS || 1996 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1997 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1998 if (rx->sta) { 1999 if (ieee80211_is_group_privacy_action(skb) && 2000 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2001 return RX_DROP_MONITOR; 2002 2003 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 2004 } 2005 if (!rx->key) 2006 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 2007 } else if (!ieee80211_has_protected(fc)) { 2008 /* 2009 * The frame was not protected, so skip decryption. However, we 2010 * need to set rx->key if there is a key that could have been 2011 * used so that the frame may be dropped if encryption would 2012 * have been expected. 2013 */ 2014 struct ieee80211_key *key = NULL; 2015 struct ieee80211_sub_if_data *sdata = rx->sdata; 2016 int i; 2017 2018 if (ieee80211_is_beacon(fc)) { 2019 key = ieee80211_rx_get_bigtk(rx, -1); 2020 } else if (ieee80211_is_mgmt(fc) && 2021 is_multicast_ether_addr(hdr->addr1)) { 2022 key = rcu_dereference(rx->sdata->default_mgmt_key); 2023 } else { 2024 if (rx->sta) { 2025 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2026 key = rcu_dereference(rx->sta->gtk[i]); 2027 if (key) 2028 break; 2029 } 2030 } 2031 if (!key) { 2032 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2033 key = rcu_dereference(sdata->keys[i]); 2034 if (key) 2035 break; 2036 } 2037 } 2038 } 2039 if (key) 2040 rx->key = key; 2041 return RX_CONTINUE; 2042 } else { 2043 /* 2044 * The device doesn't give us the IV so we won't be 2045 * able to look up the key. That's ok though, we 2046 * don't need to decrypt the frame, we just won't 2047 * be able to keep statistics accurate. 2048 * Except for key threshold notifications, should 2049 * we somehow allow the driver to tell us which key 2050 * the hardware used if this flag is set? 2051 */ 2052 if ((status->flag & RX_FLAG_DECRYPTED) && 2053 (status->flag & RX_FLAG_IV_STRIPPED)) 2054 return RX_CONTINUE; 2055 2056 keyidx = ieee80211_get_keyid(rx->skb, cs); 2057 2058 if (unlikely(keyidx < 0)) 2059 return RX_DROP_UNUSABLE; 2060 2061 /* check per-station GTK first, if multicast packet */ 2062 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 2063 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 2064 2065 /* if not found, try default key */ 2066 if (!rx->key) { 2067 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2068 2069 /* 2070 * RSNA-protected unicast frames should always be 2071 * sent with pairwise or station-to-station keys, 2072 * but for WEP we allow using a key index as well. 2073 */ 2074 if (rx->key && 2075 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2076 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2077 !is_multicast_ether_addr(hdr->addr1)) 2078 rx->key = NULL; 2079 } 2080 } 2081 2082 if (rx->key) { 2083 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2084 return RX_DROP_MONITOR; 2085 2086 /* TODO: add threshold stuff again */ 2087 } else { 2088 return RX_DROP_MONITOR; 2089 } 2090 2091 switch (rx->key->conf.cipher) { 2092 case WLAN_CIPHER_SUITE_WEP40: 2093 case WLAN_CIPHER_SUITE_WEP104: 2094 result = ieee80211_crypto_wep_decrypt(rx); 2095 break; 2096 case WLAN_CIPHER_SUITE_TKIP: 2097 result = ieee80211_crypto_tkip_decrypt(rx); 2098 break; 2099 case WLAN_CIPHER_SUITE_CCMP: 2100 result = ieee80211_crypto_ccmp_decrypt( 2101 rx, IEEE80211_CCMP_MIC_LEN); 2102 break; 2103 case WLAN_CIPHER_SUITE_CCMP_256: 2104 result = ieee80211_crypto_ccmp_decrypt( 2105 rx, IEEE80211_CCMP_256_MIC_LEN); 2106 break; 2107 case WLAN_CIPHER_SUITE_AES_CMAC: 2108 result = ieee80211_crypto_aes_cmac_decrypt(rx); 2109 break; 2110 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2111 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 2112 break; 2113 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2114 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2115 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2116 break; 2117 case WLAN_CIPHER_SUITE_GCMP: 2118 case WLAN_CIPHER_SUITE_GCMP_256: 2119 result = ieee80211_crypto_gcmp_decrypt(rx); 2120 break; 2121 default: 2122 result = ieee80211_crypto_hw_decrypt(rx); 2123 } 2124 2125 /* the hdr variable is invalid after the decrypt handlers */ 2126 2127 /* either the frame has been decrypted or will be dropped */ 2128 status->flag |= RX_FLAG_DECRYPTED; 2129 2130 if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE && 2131 rx->sdata->dev)) 2132 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2133 skb->data, skb->len); 2134 2135 return result; 2136} 2137 2138void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2139{ 2140 int i; 2141 2142 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2143 skb_queue_head_init(&cache->entries[i].skb_list); 2144} 2145 2146void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2147{ 2148 int i; 2149 2150 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2151 __skb_queue_purge(&cache->entries[i].skb_list); 2152} 2153 2154static inline struct ieee80211_fragment_entry * 2155ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2156 unsigned int frag, unsigned int seq, int rx_queue, 2157 struct sk_buff **skb) 2158{ 2159 struct ieee80211_fragment_entry *entry; 2160 2161 entry = &cache->entries[cache->next++]; 2162 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2163 cache->next = 0; 2164 2165 __skb_queue_purge(&entry->skb_list); 2166 2167 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2168 *skb = NULL; 2169 entry->first_frag_time = jiffies; 2170 entry->seq = seq; 2171 entry->rx_queue = rx_queue; 2172 entry->last_frag = frag; 2173 entry->check_sequential_pn = false; 2174 entry->extra_len = 0; 2175 2176 return entry; 2177} 2178 2179static inline struct ieee80211_fragment_entry * 2180ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2181 unsigned int frag, unsigned int seq, 2182 int rx_queue, struct ieee80211_hdr *hdr) 2183{ 2184 struct ieee80211_fragment_entry *entry; 2185 int i, idx; 2186 2187 idx = cache->next; 2188 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2189 struct ieee80211_hdr *f_hdr; 2190 struct sk_buff *f_skb; 2191 2192 idx--; 2193 if (idx < 0) 2194 idx = IEEE80211_FRAGMENT_MAX - 1; 2195 2196 entry = &cache->entries[idx]; 2197 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2198 entry->rx_queue != rx_queue || 2199 entry->last_frag + 1 != frag) 2200 continue; 2201 2202 f_skb = __skb_peek(&entry->skb_list); 2203 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2204 2205 /* 2206 * Check ftype and addresses are equal, else check next fragment 2207 */ 2208 if (((hdr->frame_control ^ f_hdr->frame_control) & 2209 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2210 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2211 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2212 continue; 2213 2214 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2215 __skb_queue_purge(&entry->skb_list); 2216 continue; 2217 } 2218 return entry; 2219 } 2220 2221 return NULL; 2222} 2223 2224static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2225{ 2226 return rx->key && 2227 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2228 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2229 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2230 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2231 ieee80211_has_protected(fc); 2232} 2233 2234static ieee80211_rx_result debug_noinline 2235ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2236{ 2237 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2238 struct ieee80211_hdr *hdr; 2239 u16 sc; 2240 __le16 fc; 2241 unsigned int frag, seq; 2242 struct ieee80211_fragment_entry *entry; 2243 struct sk_buff *skb; 2244 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2245 2246 hdr = (struct ieee80211_hdr *)rx->skb->data; 2247 fc = hdr->frame_control; 2248 2249 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2250 return RX_CONTINUE; 2251 2252 sc = le16_to_cpu(hdr->seq_ctrl); 2253 frag = sc & IEEE80211_SCTL_FRAG; 2254 2255 if (rx->sta) 2256 cache = &rx->sta->frags; 2257 2258 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2259 goto out; 2260 2261 if (is_multicast_ether_addr(hdr->addr1)) 2262 return RX_DROP_MONITOR; 2263 2264 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2265 2266 if (skb_linearize(rx->skb)) 2267 return RX_DROP_UNUSABLE; 2268 2269 /* 2270 * skb_linearize() might change the skb->data and 2271 * previously cached variables (in this case, hdr) need to 2272 * be refreshed with the new data. 2273 */ 2274 hdr = (struct ieee80211_hdr *)rx->skb->data; 2275 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2276 2277 if (frag == 0) { 2278 /* This is the first fragment of a new frame. */ 2279 entry = ieee80211_reassemble_add(cache, frag, seq, 2280 rx->seqno_idx, &(rx->skb)); 2281 if (requires_sequential_pn(rx, fc)) { 2282 int queue = rx->security_idx; 2283 2284 /* Store CCMP/GCMP PN so that we can verify that the 2285 * next fragment has a sequential PN value. 2286 */ 2287 entry->check_sequential_pn = true; 2288 entry->is_protected = true; 2289 entry->key_color = rx->key->color; 2290 memcpy(entry->last_pn, 2291 rx->key->u.ccmp.rx_pn[queue], 2292 IEEE80211_CCMP_PN_LEN); 2293 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2294 u.ccmp.rx_pn) != 2295 offsetof(struct ieee80211_key, 2296 u.gcmp.rx_pn)); 2297 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2298 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2299 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2300 IEEE80211_GCMP_PN_LEN); 2301 } else if (rx->key && 2302 (ieee80211_has_protected(fc) || 2303 (status->flag & RX_FLAG_DECRYPTED))) { 2304 entry->is_protected = true; 2305 entry->key_color = rx->key->color; 2306 } 2307 return RX_QUEUED; 2308 } 2309 2310 /* This is a fragment for a frame that should already be pending in 2311 * fragment cache. Add this fragment to the end of the pending entry. 2312 */ 2313 entry = ieee80211_reassemble_find(cache, frag, seq, 2314 rx->seqno_idx, hdr); 2315 if (!entry) { 2316 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2317 return RX_DROP_MONITOR; 2318 } 2319 2320 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2321 * MPDU PN values are not incrementing in steps of 1." 2322 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2323 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2324 */ 2325 if (entry->check_sequential_pn) { 2326 int i; 2327 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2328 2329 if (!requires_sequential_pn(rx, fc)) 2330 return RX_DROP_UNUSABLE; 2331 2332 /* Prevent mixed key and fragment cache attacks */ 2333 if (entry->key_color != rx->key->color) 2334 return RX_DROP_UNUSABLE; 2335 2336 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2337 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2338 pn[i]++; 2339 if (pn[i]) 2340 break; 2341 } 2342 2343 rpn = rx->ccm_gcm.pn; 2344 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2345 return RX_DROP_UNUSABLE; 2346 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2347 } else if (entry->is_protected && 2348 (!rx->key || 2349 (!ieee80211_has_protected(fc) && 2350 !(status->flag & RX_FLAG_DECRYPTED)) || 2351 rx->key->color != entry->key_color)) { 2352 /* Drop this as a mixed key or fragment cache attack, even 2353 * if for TKIP Michael MIC should protect us, and WEP is a 2354 * lost cause anyway. 2355 */ 2356 return RX_DROP_UNUSABLE; 2357 } else if (entry->is_protected && rx->key && 2358 entry->key_color != rx->key->color && 2359 (status->flag & RX_FLAG_DECRYPTED)) { 2360 return RX_DROP_UNUSABLE; 2361 } 2362 2363 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2364 __skb_queue_tail(&entry->skb_list, rx->skb); 2365 entry->last_frag = frag; 2366 entry->extra_len += rx->skb->len; 2367 if (ieee80211_has_morefrags(fc)) { 2368 rx->skb = NULL; 2369 return RX_QUEUED; 2370 } 2371 2372 rx->skb = __skb_dequeue(&entry->skb_list); 2373 if (skb_tailroom(rx->skb) < entry->extra_len) { 2374 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2375 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2376 GFP_ATOMIC))) { 2377 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2378 __skb_queue_purge(&entry->skb_list); 2379 return RX_DROP_UNUSABLE; 2380 } 2381 } 2382 while ((skb = __skb_dequeue(&entry->skb_list))) { 2383 skb_put_data(rx->skb, skb->data, skb->len); 2384 dev_kfree_skb(skb); 2385 } 2386 2387 out: 2388 ieee80211_led_rx(rx->local); 2389 if (rx->sta) 2390 rx->sta->rx_stats.packets++; 2391 return RX_CONTINUE; 2392} 2393 2394static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2395{ 2396 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2397 return -EACCES; 2398 2399 return 0; 2400} 2401 2402static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2403{ 2404 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 2405 struct sk_buff *skb = rx->skb; 2406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2407 2408 /* 2409 * Pass through unencrypted frames if the hardware has 2410 * decrypted them already. 2411 */ 2412 if (status->flag & RX_FLAG_DECRYPTED) 2413 return 0; 2414 2415 /* check mesh EAPOL frames first */ 2416 if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) && 2417 ieee80211_is_data(fc))) { 2418 struct ieee80211s_hdr *mesh_hdr; 2419 u16 hdr_len = ieee80211_hdrlen(fc); 2420 u16 ethertype_offset; 2421 __be16 ethertype; 2422 2423 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr)) 2424 goto drop_check; 2425 2426 /* make sure fixed part of mesh header is there, also checks skb len */ 2427 if (!pskb_may_pull(rx->skb, hdr_len + 6)) 2428 goto drop_check; 2429 2430 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len); 2431 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) + 2432 sizeof(rfc1042_header); 2433 2434 if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 && 2435 ethertype == rx->sdata->control_port_protocol) 2436 return 0; 2437 } 2438 2439drop_check: 2440 /* Drop unencrypted frames if key is set. */ 2441 if (unlikely(!ieee80211_has_protected(fc) && 2442 !ieee80211_is_any_nullfunc(fc) && 2443 ieee80211_is_data(fc) && rx->key)) 2444 return -EACCES; 2445 2446 return 0; 2447} 2448 2449static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2450{ 2451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2452 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2453 __le16 fc = hdr->frame_control; 2454 2455 /* 2456 * Pass through unencrypted frames if the hardware has 2457 * decrypted them already. 2458 */ 2459 if (status->flag & RX_FLAG_DECRYPTED) 2460 return 0; 2461 2462 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2463 if (unlikely(!ieee80211_has_protected(fc) && 2464 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 2465 rx->key)) { 2466 if (ieee80211_is_deauth(fc) || 2467 ieee80211_is_disassoc(fc)) 2468 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2469 rx->skb->data, 2470 rx->skb->len); 2471 return -EACCES; 2472 } 2473 /* BIP does not use Protected field, so need to check MMIE */ 2474 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2475 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2476 if (ieee80211_is_deauth(fc) || 2477 ieee80211_is_disassoc(fc)) 2478 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2479 rx->skb->data, 2480 rx->skb->len); 2481 return -EACCES; 2482 } 2483 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2484 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2485 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2486 rx->skb->data, 2487 rx->skb->len); 2488 return -EACCES; 2489 } 2490 /* 2491 * When using MFP, Action frames are not allowed prior to 2492 * having configured keys. 2493 */ 2494 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2495 ieee80211_is_robust_mgmt_frame(rx->skb))) 2496 return -EACCES; 2497 } 2498 2499 return 0; 2500} 2501 2502static int 2503__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2504{ 2505 struct ieee80211_sub_if_data *sdata = rx->sdata; 2506 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2507 bool check_port_control = false; 2508 struct ethhdr *ehdr; 2509 int ret; 2510 2511 *port_control = false; 2512 if (ieee80211_has_a4(hdr->frame_control) && 2513 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2514 return -1; 2515 2516 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2517 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2518 2519 if (!sdata->u.mgd.use_4addr) 2520 return -1; 2521 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2522 check_port_control = true; 2523 } 2524 2525 if (is_multicast_ether_addr(hdr->addr1) && 2526 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2527 return -1; 2528 2529 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2530 if (ret < 0) 2531 return ret; 2532 2533 ehdr = (struct ethhdr *) rx->skb->data; 2534 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2535 *port_control = true; 2536 else if (check_port_control) 2537 return -1; 2538 2539 return 0; 2540} 2541 2542/* 2543 * requires that rx->skb is a frame with ethernet header 2544 */ 2545static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2546{ 2547 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2548 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2549 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2550 2551 /* 2552 * Allow EAPOL frames to us/the PAE group address regardless of 2553 * whether the frame was encrypted or not, and always disallow 2554 * all other destination addresses for them. 2555 */ 2556 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2557 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || 2558 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2559 2560 if (ieee80211_802_1x_port_control(rx) || 2561 ieee80211_drop_unencrypted(rx, fc)) 2562 return false; 2563 2564 return true; 2565} 2566 2567static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2568 struct ieee80211_rx_data *rx) 2569{ 2570 struct ieee80211_sub_if_data *sdata = rx->sdata; 2571 struct net_device *dev = sdata->dev; 2572 2573 if (unlikely((skb->protocol == sdata->control_port_protocol || 2574 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2575 !sdata->control_port_no_preauth)) && 2576 sdata->control_port_over_nl80211)) { 2577 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2578 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2579 2580 cfg80211_rx_control_port(dev, skb, noencrypt); 2581 dev_kfree_skb(skb); 2582 } else { 2583 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2584 2585 memset(skb->cb, 0, sizeof(skb->cb)); 2586 2587 /* 2588 * 802.1X over 802.11 requires that the authenticator address 2589 * be used for EAPOL frames. However, 802.1X allows the use of 2590 * the PAE group address instead. If the interface is part of 2591 * a bridge and we pass the frame with the PAE group address, 2592 * then the bridge will forward it to the network (even if the 2593 * client was not associated yet), which isn't supposed to 2594 * happen. 2595 * To avoid that, rewrite the destination address to our own 2596 * address, so that the authenticator (e.g. hostapd) will see 2597 * the frame, but bridge won't forward it anywhere else. Note 2598 * that due to earlier filtering, the only other address can 2599 * be the PAE group address. 2600 */ 2601 if (unlikely(skb->protocol == sdata->control_port_protocol && 2602 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2603 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2604 2605 /* deliver to local stack */ 2606 if (rx->list) 2607 list_add_tail(&skb->list, rx->list); 2608 else 2609 netif_receive_skb(skb); 2610 } 2611} 2612 2613/* 2614 * requires that rx->skb is a frame with ethernet header 2615 */ 2616static void 2617ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2618{ 2619 struct ieee80211_sub_if_data *sdata = rx->sdata; 2620 struct net_device *dev = sdata->dev; 2621 struct sk_buff *skb, *xmit_skb; 2622 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2623 struct sta_info *dsta; 2624 2625 skb = rx->skb; 2626 xmit_skb = NULL; 2627 2628 ieee80211_rx_stats(dev, skb->len); 2629 2630 if (rx->sta) { 2631 /* The seqno index has the same property as needed 2632 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2633 * for non-QoS-data frames. Here we know it's a data 2634 * frame, so count MSDUs. 2635 */ 2636 u64_stats_update_begin(&rx->sta->rx_stats.syncp); 2637 rx->sta->rx_stats.msdu[rx->seqno_idx]++; 2638 u64_stats_update_end(&rx->sta->rx_stats.syncp); 2639 } 2640 2641 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2642 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2643 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2644 ehdr->h_proto != rx->sdata->control_port_protocol && 2645 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2646 if (is_multicast_ether_addr(ehdr->h_dest) && 2647 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2648 /* 2649 * send multicast frames both to higher layers in 2650 * local net stack and back to the wireless medium 2651 */ 2652 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2653 if (!xmit_skb) 2654 net_info_ratelimited("%s: failed to clone multicast frame\n", 2655 dev->name); 2656 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2657 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2658 dsta = sta_info_get(sdata, ehdr->h_dest); 2659 if (dsta) { 2660 /* 2661 * The destination station is associated to 2662 * this AP (in this VLAN), so send the frame 2663 * directly to it and do not pass it to local 2664 * net stack. 2665 */ 2666 xmit_skb = skb; 2667 skb = NULL; 2668 } 2669 } 2670 } 2671 2672#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2673 if (skb) { 2674 /* 'align' will only take the values 0 or 2 here since all 2675 * frames are required to be aligned to 2-byte boundaries 2676 * when being passed to mac80211; the code here works just 2677 * as well if that isn't true, but mac80211 assumes it can 2678 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2679 */ 2680 int align; 2681 2682 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2683 if (align) { 2684 if (WARN_ON(skb_headroom(skb) < 3)) { 2685 dev_kfree_skb(skb); 2686 skb = NULL; 2687 } else { 2688 u8 *data = skb->data; 2689 size_t len = skb_headlen(skb); 2690 skb->data -= align; 2691 memmove(skb->data, data, len); 2692 skb_set_tail_pointer(skb, len); 2693 } 2694 } 2695 } 2696#endif 2697 2698 if (skb) { 2699 skb->protocol = eth_type_trans(skb, dev); 2700 ieee80211_deliver_skb_to_local_stack(skb, rx); 2701 } 2702 2703 if (xmit_skb) { 2704 /* 2705 * Send to wireless media and increase priority by 256 to 2706 * keep the received priority instead of reclassifying 2707 * the frame (see cfg80211_classify8021d). 2708 */ 2709 xmit_skb->priority += 256; 2710 xmit_skb->protocol = htons(ETH_P_802_3); 2711 skb_reset_network_header(xmit_skb); 2712 skb_reset_mac_header(xmit_skb); 2713 dev_queue_xmit(xmit_skb); 2714 } 2715} 2716 2717static ieee80211_rx_result debug_noinline 2718__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 2719{ 2720 struct net_device *dev = rx->sdata->dev; 2721 struct sk_buff *skb = rx->skb; 2722 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2723 __le16 fc = hdr->frame_control; 2724 struct sk_buff_head frame_list; 2725 struct ethhdr ethhdr; 2726 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 2727 2728 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 2729 check_da = NULL; 2730 check_sa = NULL; 2731 } else switch (rx->sdata->vif.type) { 2732 case NL80211_IFTYPE_AP: 2733 case NL80211_IFTYPE_AP_VLAN: 2734 check_da = NULL; 2735 break; 2736 case NL80211_IFTYPE_STATION: 2737 if (!rx->sta || 2738 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 2739 check_sa = NULL; 2740 break; 2741 case NL80211_IFTYPE_MESH_POINT: 2742 check_sa = NULL; 2743 break; 2744 default: 2745 break; 2746 } 2747 2748 skb->dev = dev; 2749 __skb_queue_head_init(&frame_list); 2750 2751 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 2752 rx->sdata->vif.addr, 2753 rx->sdata->vif.type, 2754 data_offset, true)) 2755 return RX_DROP_UNUSABLE; 2756 2757 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 2758 rx->sdata->vif.type, 2759 rx->local->hw.extra_tx_headroom, 2760 check_da, check_sa); 2761 2762 while (!skb_queue_empty(&frame_list)) { 2763 rx->skb = __skb_dequeue(&frame_list); 2764 2765 if (!ieee80211_frame_allowed(rx, fc)) { 2766 dev_kfree_skb(rx->skb); 2767 continue; 2768 } 2769 2770 ieee80211_deliver_skb(rx); 2771 } 2772 2773 return RX_QUEUED; 2774} 2775 2776static ieee80211_rx_result debug_noinline 2777ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 2778{ 2779 struct sk_buff *skb = rx->skb; 2780 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2781 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2782 __le16 fc = hdr->frame_control; 2783 2784 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 2785 return RX_CONTINUE; 2786 2787 if (unlikely(!ieee80211_is_data(fc))) 2788 return RX_CONTINUE; 2789 2790 if (unlikely(!ieee80211_is_data_present(fc))) 2791 return RX_DROP_MONITOR; 2792 2793 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 2794 switch (rx->sdata->vif.type) { 2795 case NL80211_IFTYPE_AP_VLAN: 2796 if (!rx->sdata->u.vlan.sta) 2797 return RX_DROP_UNUSABLE; 2798 break; 2799 case NL80211_IFTYPE_STATION: 2800 if (!rx->sdata->u.mgd.use_4addr) 2801 return RX_DROP_UNUSABLE; 2802 break; 2803 default: 2804 return RX_DROP_UNUSABLE; 2805 } 2806 } 2807 2808 if (is_multicast_ether_addr(hdr->addr1)) 2809 return RX_DROP_UNUSABLE; 2810 2811 if (rx->key) { 2812 /* 2813 * We should not receive A-MSDUs on pre-HT connections, 2814 * and HT connections cannot use old ciphers. Thus drop 2815 * them, as in those cases we couldn't even have SPP 2816 * A-MSDUs or such. 2817 */ 2818 switch (rx->key->conf.cipher) { 2819 case WLAN_CIPHER_SUITE_WEP40: 2820 case WLAN_CIPHER_SUITE_WEP104: 2821 case WLAN_CIPHER_SUITE_TKIP: 2822 return RX_DROP_UNUSABLE; 2823 default: 2824 break; 2825 } 2826 } 2827 2828 return __ieee80211_rx_h_amsdu(rx, 0); 2829} 2830 2831#ifdef CONFIG_MAC80211_MESH 2832static ieee80211_rx_result 2833ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 2834{ 2835 struct ieee80211_hdr *fwd_hdr, *hdr; 2836 struct ieee80211_tx_info *info; 2837 struct ieee80211s_hdr *mesh_hdr; 2838 struct sk_buff *skb = rx->skb, *fwd_skb; 2839 struct ieee80211_local *local = rx->local; 2840 struct ieee80211_sub_if_data *sdata = rx->sdata; 2841 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2842 u16 ac, q, hdrlen; 2843 int tailroom = 0; 2844 2845 hdr = (struct ieee80211_hdr *) skb->data; 2846 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2847 2848 /* make sure fixed part of mesh header is there, also checks skb len */ 2849 if (!pskb_may_pull(rx->skb, hdrlen + 6)) 2850 return RX_DROP_MONITOR; 2851 2852 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2853 2854 /* make sure full mesh header is there, also checks skb len */ 2855 if (!pskb_may_pull(rx->skb, 2856 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) 2857 return RX_DROP_MONITOR; 2858 2859 /* reload pointers */ 2860 hdr = (struct ieee80211_hdr *) skb->data; 2861 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2862 2863 if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) 2864 return RX_DROP_MONITOR; 2865 2866 /* frame is in RMC, don't forward */ 2867 if (ieee80211_is_data(hdr->frame_control) && 2868 is_multicast_ether_addr(hdr->addr1) && 2869 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) 2870 return RX_DROP_MONITOR; 2871 2872 if (!ieee80211_is_data(hdr->frame_control)) 2873 return RX_CONTINUE; 2874 2875 if (!mesh_hdr->ttl) 2876 return RX_DROP_MONITOR; 2877 2878 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2879 struct mesh_path *mppath; 2880 char *proxied_addr; 2881 char *mpp_addr; 2882 2883 if (is_multicast_ether_addr(hdr->addr1)) { 2884 mpp_addr = hdr->addr3; 2885 proxied_addr = mesh_hdr->eaddr1; 2886 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) == 2887 MESH_FLAGS_AE_A5_A6) { 2888 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2889 mpp_addr = hdr->addr4; 2890 proxied_addr = mesh_hdr->eaddr2; 2891 } else { 2892 return RX_DROP_MONITOR; 2893 } 2894 2895 rcu_read_lock(); 2896 mppath = mpp_path_lookup(sdata, proxied_addr); 2897 if (!mppath) { 2898 mpp_path_add(sdata, proxied_addr, mpp_addr); 2899 } else { 2900 spin_lock_bh(&mppath->state_lock); 2901 if (!ether_addr_equal(mppath->mpp, mpp_addr)) 2902 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 2903 mppath->exp_time = jiffies; 2904 spin_unlock_bh(&mppath->state_lock); 2905 } 2906 rcu_read_unlock(); 2907 } 2908 2909 /* Frame has reached destination. Don't forward */ 2910 if (!is_multicast_ether_addr(hdr->addr1) && 2911 ether_addr_equal(sdata->vif.addr, hdr->addr3)) 2912 return RX_CONTINUE; 2913 2914 ac = ieee802_1d_to_ac[skb->priority]; 2915 q = sdata->vif.hw_queue[ac]; 2916 if (ieee80211_queue_stopped(&local->hw, q)) { 2917 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 2918 return RX_DROP_MONITOR; 2919 } 2920 skb_set_queue_mapping(skb, ac); 2921 2922 if (!--mesh_hdr->ttl) { 2923 if (!is_multicast_ether_addr(hdr->addr1)) 2924 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, 2925 dropped_frames_ttl); 2926 goto out; 2927 } 2928 2929 if (!ifmsh->mshcfg.dot11MeshForwarding) 2930 goto out; 2931 2932 if (sdata->crypto_tx_tailroom_needed_cnt) 2933 tailroom = IEEE80211_ENCRYPT_TAILROOM; 2934 2935 fwd_skb = skb_copy_expand(skb, local->tx_headroom + 2936 sdata->encrypt_headroom, 2937 tailroom, GFP_ATOMIC); 2938 if (!fwd_skb) 2939 goto out; 2940 2941 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 2942 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); 2943 info = IEEE80211_SKB_CB(fwd_skb); 2944 memset(info, 0, sizeof(*info)); 2945 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 2946 info->control.vif = &rx->sdata->vif; 2947 info->control.jiffies = jiffies; 2948 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 2949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2950 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2951 /* update power mode indication when forwarding */ 2952 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2953 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2954 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2955 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2956 } else { 2957 /* unable to resolve next hop */ 2958 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2959 fwd_hdr->addr3, 0, 2960 WLAN_REASON_MESH_PATH_NOFORWARD, 2961 fwd_hdr->addr2); 2962 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 2963 kfree_skb(fwd_skb); 2964 return RX_DROP_MONITOR; 2965 } 2966 2967 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2968 ieee80211_add_pending_skb(local, fwd_skb); 2969 out: 2970 if (is_multicast_ether_addr(hdr->addr1)) 2971 return RX_CONTINUE; 2972 return RX_DROP_MONITOR; 2973} 2974#endif 2975 2976static ieee80211_rx_result debug_noinline 2977ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 2978{ 2979 struct ieee80211_sub_if_data *sdata = rx->sdata; 2980 struct ieee80211_local *local = rx->local; 2981 struct net_device *dev = sdata->dev; 2982 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2983 __le16 fc = hdr->frame_control; 2984 bool port_control; 2985 int err; 2986 2987 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 2988 return RX_CONTINUE; 2989 2990 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 2991 return RX_DROP_MONITOR; 2992 2993 /* 2994 * Send unexpected-4addr-frame event to hostapd. For older versions, 2995 * also drop the frame to cooked monitor interfaces. 2996 */ 2997 if (ieee80211_has_a4(hdr->frame_control) && 2998 sdata->vif.type == NL80211_IFTYPE_AP) { 2999 if (rx->sta && 3000 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3001 cfg80211_rx_unexpected_4addr_frame( 3002 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 3003 return RX_DROP_MONITOR; 3004 } 3005 3006 err = __ieee80211_data_to_8023(rx, &port_control); 3007 if (unlikely(err)) 3008 return RX_DROP_UNUSABLE; 3009 3010 if (!ieee80211_frame_allowed(rx, fc)) 3011 return RX_DROP_MONITOR; 3012 3013 /* directly handle TDLS channel switch requests/responses */ 3014 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3015 cpu_to_be16(ETH_P_TDLS))) { 3016 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3017 3018 if (pskb_may_pull(rx->skb, 3019 offsetof(struct ieee80211_tdls_data, u)) && 3020 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3021 tf->category == WLAN_CATEGORY_TDLS && 3022 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3023 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3024 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb); 3025 schedule_work(&local->tdls_chsw_work); 3026 if (rx->sta) 3027 rx->sta->rx_stats.packets++; 3028 3029 return RX_QUEUED; 3030 } 3031 } 3032 3033 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3034 unlikely(port_control) && sdata->bss) { 3035 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3036 u.ap); 3037 dev = sdata->dev; 3038 rx->sdata = sdata; 3039 } 3040 3041 rx->skb->dev = dev; 3042 3043 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3044 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3045 !is_multicast_ether_addr( 3046 ((struct ethhdr *)rx->skb->data)->h_dest) && 3047 (!local->scanning && 3048 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3049 mod_timer(&local->dynamic_ps_timer, jiffies + 3050 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3051 3052 ieee80211_deliver_skb(rx); 3053 3054 return RX_QUEUED; 3055} 3056 3057static ieee80211_rx_result debug_noinline 3058ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3059{ 3060 struct sk_buff *skb = rx->skb; 3061 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3062 struct tid_ampdu_rx *tid_agg_rx; 3063 u16 start_seq_num; 3064 u16 tid; 3065 3066 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3067 return RX_CONTINUE; 3068 3069 if (ieee80211_is_back_req(bar->frame_control)) { 3070 struct { 3071 __le16 control, start_seq_num; 3072 } __packed bar_data; 3073 struct ieee80211_event event = { 3074 .type = BAR_RX_EVENT, 3075 }; 3076 3077 if (!rx->sta) 3078 return RX_DROP_MONITOR; 3079 3080 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3081 &bar_data, sizeof(bar_data))) 3082 return RX_DROP_MONITOR; 3083 3084 tid = le16_to_cpu(bar_data.control) >> 12; 3085 3086 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3087 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3088 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3089 WLAN_BACK_RECIPIENT, 3090 WLAN_REASON_QSTA_REQUIRE_SETUP); 3091 3092 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3093 if (!tid_agg_rx) 3094 return RX_DROP_MONITOR; 3095 3096 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3097 event.u.ba.tid = tid; 3098 event.u.ba.ssn = start_seq_num; 3099 event.u.ba.sta = &rx->sta->sta; 3100 3101 /* reset session timer */ 3102 if (tid_agg_rx->timeout) 3103 mod_timer(&tid_agg_rx->session_timer, 3104 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3105 3106 spin_lock(&tid_agg_rx->reorder_lock); 3107 /* release stored frames up to start of BAR */ 3108 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3109 start_seq_num, frames); 3110 spin_unlock(&tid_agg_rx->reorder_lock); 3111 3112 drv_event_callback(rx->local, rx->sdata, &event); 3113 3114 kfree_skb(skb); 3115 return RX_QUEUED; 3116 } 3117 3118 /* 3119 * After this point, we only want management frames, 3120 * so we can drop all remaining control frames to 3121 * cooked monitor interfaces. 3122 */ 3123 return RX_DROP_MONITOR; 3124} 3125 3126static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3127 struct ieee80211_mgmt *mgmt, 3128 size_t len) 3129{ 3130 struct ieee80211_local *local = sdata->local; 3131 struct sk_buff *skb; 3132 struct ieee80211_mgmt *resp; 3133 3134 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3135 /* Not to own unicast address */ 3136 return; 3137 } 3138 3139 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || 3140 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { 3141 /* Not from the current AP or not associated yet. */ 3142 return; 3143 } 3144 3145 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 3146 /* Too short SA Query request frame */ 3147 return; 3148 } 3149 3150 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3151 if (skb == NULL) 3152 return; 3153 3154 skb_reserve(skb, local->hw.extra_tx_headroom); 3155 resp = skb_put_zero(skb, 24); 3156 memcpy(resp->da, mgmt->sa, ETH_ALEN); 3157 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3158 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 3159 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3160 IEEE80211_STYPE_ACTION); 3161 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 3162 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3163 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 3164 memcpy(resp->u.action.u.sa_query.trans_id, 3165 mgmt->u.action.u.sa_query.trans_id, 3166 WLAN_SA_QUERY_TR_ID_LEN); 3167 3168 ieee80211_tx_skb(sdata, skb); 3169} 3170 3171static ieee80211_rx_result debug_noinline 3172ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3173{ 3174 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3175 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3176 3177 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3178 return RX_CONTINUE; 3179 3180 /* 3181 * From here on, look only at management frames. 3182 * Data and control frames are already handled, 3183 * and unknown (reserved) frames are useless. 3184 */ 3185 if (rx->skb->len < 24) 3186 return RX_DROP_MONITOR; 3187 3188 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3189 return RX_DROP_MONITOR; 3190 3191 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3192 ieee80211_is_beacon(mgmt->frame_control) && 3193 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3194 int sig = 0; 3195 3196 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3197 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3198 sig = status->signal; 3199 3200 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3201 rx->skb->data, rx->skb->len, 3202 ieee80211_rx_status_to_khz(status), 3203 sig); 3204 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3205 } 3206 3207 if (ieee80211_drop_unencrypted_mgmt(rx)) 3208 return RX_DROP_UNUSABLE; 3209 3210 return RX_CONTINUE; 3211} 3212 3213static ieee80211_rx_result debug_noinline 3214ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3215{ 3216 struct ieee80211_local *local = rx->local; 3217 struct ieee80211_sub_if_data *sdata = rx->sdata; 3218 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3219 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3220 int len = rx->skb->len; 3221 3222 if (!ieee80211_is_action(mgmt->frame_control)) 3223 return RX_CONTINUE; 3224 3225 /* drop too small frames */ 3226 if (len < IEEE80211_MIN_ACTION_SIZE) 3227 return RX_DROP_UNUSABLE; 3228 3229 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3230 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3231 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3232 return RX_DROP_UNUSABLE; 3233 3234 switch (mgmt->u.action.category) { 3235 case WLAN_CATEGORY_HT: 3236 /* reject HT action frames from stations not supporting HT */ 3237 if (!rx->sta->sta.ht_cap.ht_supported) 3238 goto invalid; 3239 3240 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3241 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3242 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3243 sdata->vif.type != NL80211_IFTYPE_AP && 3244 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3245 break; 3246 3247 /* verify action & smps_control/chanwidth are present */ 3248 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3249 goto invalid; 3250 3251 switch (mgmt->u.action.u.ht_smps.action) { 3252 case WLAN_HT_ACTION_SMPS: { 3253 struct ieee80211_supported_band *sband; 3254 enum ieee80211_smps_mode smps_mode; 3255 struct sta_opmode_info sta_opmode = {}; 3256 3257 if (sdata->vif.type != NL80211_IFTYPE_AP && 3258 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3259 goto handled; 3260 3261 /* convert to HT capability */ 3262 switch (mgmt->u.action.u.ht_smps.smps_control) { 3263 case WLAN_HT_SMPS_CONTROL_DISABLED: 3264 smps_mode = IEEE80211_SMPS_OFF; 3265 break; 3266 case WLAN_HT_SMPS_CONTROL_STATIC: 3267 smps_mode = IEEE80211_SMPS_STATIC; 3268 break; 3269 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3270 smps_mode = IEEE80211_SMPS_DYNAMIC; 3271 break; 3272 default: 3273 goto invalid; 3274 } 3275 3276 /* if no change do nothing */ 3277 if (rx->sta->sta.smps_mode == smps_mode) 3278 goto handled; 3279 rx->sta->sta.smps_mode = smps_mode; 3280 sta_opmode.smps_mode = 3281 ieee80211_smps_mode_to_smps_mode(smps_mode); 3282 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3283 3284 sband = rx->local->hw.wiphy->bands[status->band]; 3285 3286 rate_control_rate_update(local, sband, rx->sta, 3287 IEEE80211_RC_SMPS_CHANGED); 3288 cfg80211_sta_opmode_change_notify(sdata->dev, 3289 rx->sta->addr, 3290 &sta_opmode, 3291 GFP_ATOMIC); 3292 goto handled; 3293 } 3294 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3295 struct ieee80211_supported_band *sband; 3296 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 3297 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 3298 struct sta_opmode_info sta_opmode = {}; 3299 3300 /* If it doesn't support 40 MHz it can't change ... */ 3301 if (!(rx->sta->sta.ht_cap.cap & 3302 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3303 goto handled; 3304 3305 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 3306 max_bw = IEEE80211_STA_RX_BW_20; 3307 else 3308 max_bw = ieee80211_sta_cap_rx_bw(rx->sta); 3309 3310 /* set cur_max_bandwidth and recalc sta bw */ 3311 rx->sta->cur_max_bandwidth = max_bw; 3312 new_bw = ieee80211_sta_cur_vht_bw(rx->sta); 3313 3314 if (rx->sta->sta.bandwidth == new_bw) 3315 goto handled; 3316 3317 rx->sta->sta.bandwidth = new_bw; 3318 sband = rx->local->hw.wiphy->bands[status->band]; 3319 sta_opmode.bw = 3320 ieee80211_sta_rx_bw_to_chan_width(rx->sta); 3321 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; 3322 3323 rate_control_rate_update(local, sband, rx->sta, 3324 IEEE80211_RC_BW_CHANGED); 3325 cfg80211_sta_opmode_change_notify(sdata->dev, 3326 rx->sta->addr, 3327 &sta_opmode, 3328 GFP_ATOMIC); 3329 goto handled; 3330 } 3331 default: 3332 goto invalid; 3333 } 3334 3335 break; 3336 case WLAN_CATEGORY_PUBLIC: 3337 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3338 goto invalid; 3339 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3340 break; 3341 if (!rx->sta) 3342 break; 3343 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) 3344 break; 3345 if (mgmt->u.action.u.ext_chan_switch.action_code != 3346 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3347 break; 3348 if (len < offsetof(struct ieee80211_mgmt, 3349 u.action.u.ext_chan_switch.variable)) 3350 goto invalid; 3351 goto queue; 3352 case WLAN_CATEGORY_VHT: 3353 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3354 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3355 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3356 sdata->vif.type != NL80211_IFTYPE_AP && 3357 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3358 break; 3359 3360 /* verify action code is present */ 3361 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3362 goto invalid; 3363 3364 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 3365 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3366 /* verify opmode is present */ 3367 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3368 goto invalid; 3369 goto queue; 3370 } 3371 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3372 if (len < IEEE80211_MIN_ACTION_SIZE + 25) 3373 goto invalid; 3374 goto queue; 3375 } 3376 default: 3377 break; 3378 } 3379 break; 3380 case WLAN_CATEGORY_BACK: 3381 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3382 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3383 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3384 sdata->vif.type != NL80211_IFTYPE_AP && 3385 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3386 break; 3387 3388 /* verify action_code is present */ 3389 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3390 break; 3391 3392 switch (mgmt->u.action.u.addba_req.action_code) { 3393 case WLAN_ACTION_ADDBA_REQ: 3394 if (len < (IEEE80211_MIN_ACTION_SIZE + 3395 sizeof(mgmt->u.action.u.addba_req))) 3396 goto invalid; 3397 break; 3398 case WLAN_ACTION_ADDBA_RESP: 3399 if (len < (IEEE80211_MIN_ACTION_SIZE + 3400 sizeof(mgmt->u.action.u.addba_resp))) 3401 goto invalid; 3402 break; 3403 case WLAN_ACTION_DELBA: 3404 if (len < (IEEE80211_MIN_ACTION_SIZE + 3405 sizeof(mgmt->u.action.u.delba))) 3406 goto invalid; 3407 break; 3408 default: 3409 goto invalid; 3410 } 3411 3412 goto queue; 3413 case WLAN_CATEGORY_SPECTRUM_MGMT: 3414 /* verify action_code is present */ 3415 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3416 break; 3417 3418 switch (mgmt->u.action.u.measurement.action_code) { 3419 case WLAN_ACTION_SPCT_MSR_REQ: 3420 if (status->band != NL80211_BAND_5GHZ) 3421 break; 3422 3423 if (len < (IEEE80211_MIN_ACTION_SIZE + 3424 sizeof(mgmt->u.action.u.measurement))) 3425 break; 3426 3427 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3428 break; 3429 3430 ieee80211_process_measurement_req(sdata, mgmt, len); 3431 goto handled; 3432 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3433 u8 *bssid; 3434 if (len < (IEEE80211_MIN_ACTION_SIZE + 3435 sizeof(mgmt->u.action.u.chan_switch))) 3436 break; 3437 3438 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3439 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3440 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3441 break; 3442 3443 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3444 bssid = sdata->u.mgd.bssid; 3445 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3446 bssid = sdata->u.ibss.bssid; 3447 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3448 bssid = mgmt->sa; 3449 else 3450 break; 3451 3452 if (!ether_addr_equal(mgmt->bssid, bssid)) 3453 break; 3454 3455 goto queue; 3456 } 3457 } 3458 break; 3459 case WLAN_CATEGORY_SELF_PROTECTED: 3460 if (len < (IEEE80211_MIN_ACTION_SIZE + 3461 sizeof(mgmt->u.action.u.self_prot.action_code))) 3462 break; 3463 3464 switch (mgmt->u.action.u.self_prot.action_code) { 3465 case WLAN_SP_MESH_PEERING_OPEN: 3466 case WLAN_SP_MESH_PEERING_CLOSE: 3467 case WLAN_SP_MESH_PEERING_CONFIRM: 3468 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3469 goto invalid; 3470 if (sdata->u.mesh.user_mpm) 3471 /* userspace handles this frame */ 3472 break; 3473 goto queue; 3474 case WLAN_SP_MGK_INFORM: 3475 case WLAN_SP_MGK_ACK: 3476 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3477 goto invalid; 3478 break; 3479 } 3480 break; 3481 case WLAN_CATEGORY_MESH_ACTION: 3482 if (len < (IEEE80211_MIN_ACTION_SIZE + 3483 sizeof(mgmt->u.action.u.mesh_action.action_code))) 3484 break; 3485 3486 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3487 break; 3488 if (mesh_action_is_path_sel(mgmt) && 3489 !mesh_path_sel_is_hwmp(sdata)) 3490 break; 3491 goto queue; 3492 } 3493 3494 return RX_CONTINUE; 3495 3496 invalid: 3497 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3498 /* will return in the next handlers */ 3499 return RX_CONTINUE; 3500 3501 handled: 3502 if (rx->sta) 3503 rx->sta->rx_stats.packets++; 3504 dev_kfree_skb(rx->skb); 3505 return RX_QUEUED; 3506 3507 queue: 3508 skb_queue_tail(&sdata->skb_queue, rx->skb); 3509 ieee80211_queue_work(&local->hw, &sdata->work); 3510 if (rx->sta) 3511 rx->sta->rx_stats.packets++; 3512 return RX_QUEUED; 3513} 3514 3515static ieee80211_rx_result debug_noinline 3516ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3517{ 3518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3519 int sig = 0; 3520 3521 /* skip known-bad action frames and return them in the next handler */ 3522 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3523 return RX_CONTINUE; 3524 3525 /* 3526 * Getting here means the kernel doesn't know how to handle 3527 * it, but maybe userspace does ... include returned frames 3528 * so userspace can register for those to know whether ones 3529 * it transmitted were processed or returned. 3530 */ 3531 3532 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3533 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3534 sig = status->signal; 3535 3536 if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev, 3537 ieee80211_rx_status_to_khz(status), sig, 3538 rx->skb->data, rx->skb->len, 0)) { 3539 if (rx->sta) 3540 rx->sta->rx_stats.packets++; 3541 dev_kfree_skb(rx->skb); 3542 return RX_QUEUED; 3543 } 3544 3545 return RX_CONTINUE; 3546} 3547 3548static ieee80211_rx_result debug_noinline 3549ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 3550{ 3551 struct ieee80211_sub_if_data *sdata = rx->sdata; 3552 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3553 int len = rx->skb->len; 3554 3555 if (!ieee80211_is_action(mgmt->frame_control)) 3556 return RX_CONTINUE; 3557 3558 switch (mgmt->u.action.category) { 3559 case WLAN_CATEGORY_SA_QUERY: 3560 if (len < (IEEE80211_MIN_ACTION_SIZE + 3561 sizeof(mgmt->u.action.u.sa_query))) 3562 break; 3563 3564 switch (mgmt->u.action.u.sa_query.action) { 3565 case WLAN_ACTION_SA_QUERY_REQUEST: 3566 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3567 break; 3568 ieee80211_process_sa_query_req(sdata, mgmt, len); 3569 goto handled; 3570 } 3571 break; 3572 } 3573 3574 return RX_CONTINUE; 3575 3576 handled: 3577 if (rx->sta) 3578 rx->sta->rx_stats.packets++; 3579 dev_kfree_skb(rx->skb); 3580 return RX_QUEUED; 3581} 3582 3583static ieee80211_rx_result debug_noinline 3584ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 3585{ 3586 struct ieee80211_local *local = rx->local; 3587 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3588 struct sk_buff *nskb; 3589 struct ieee80211_sub_if_data *sdata = rx->sdata; 3590 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3591 3592 if (!ieee80211_is_action(mgmt->frame_control)) 3593 return RX_CONTINUE; 3594 3595 /* 3596 * For AP mode, hostapd is responsible for handling any action 3597 * frames that we didn't handle, including returning unknown 3598 * ones. For all other modes we will return them to the sender, 3599 * setting the 0x80 bit in the action category, as required by 3600 * 802.11-2012 9.24.4. 3601 * Newer versions of hostapd shall also use the management frame 3602 * registration mechanisms, but older ones still use cooked 3603 * monitor interfaces so push all frames there. 3604 */ 3605 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 3606 (sdata->vif.type == NL80211_IFTYPE_AP || 3607 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 3608 return RX_DROP_MONITOR; 3609 3610 if (is_multicast_ether_addr(mgmt->da)) 3611 return RX_DROP_MONITOR; 3612 3613 /* do not return rejected action frames */ 3614 if (mgmt->u.action.category & 0x80) 3615 return RX_DROP_UNUSABLE; 3616 3617 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 3618 GFP_ATOMIC); 3619 if (nskb) { 3620 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 3621 3622 nmgmt->u.action.category |= 0x80; 3623 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 3624 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 3625 3626 memset(nskb->cb, 0, sizeof(nskb->cb)); 3627 3628 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 3629 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 3630 3631 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 3632 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 3633 IEEE80211_TX_CTL_NO_CCK_RATE; 3634 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 3635 info->hw_queue = 3636 local->hw.offchannel_tx_hw_queue; 3637 } 3638 3639 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, 3640 status->band); 3641 } 3642 dev_kfree_skb(rx->skb); 3643 return RX_QUEUED; 3644} 3645 3646static ieee80211_rx_result debug_noinline 3647ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 3648{ 3649 struct ieee80211_sub_if_data *sdata = rx->sdata; 3650 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 3651 3652 if (!ieee80211_is_ext(hdr->frame_control)) 3653 return RX_CONTINUE; 3654 3655 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3656 return RX_DROP_MONITOR; 3657 3658 /* for now only beacons are ext, so queue them */ 3659 skb_queue_tail(&sdata->skb_queue, rx->skb); 3660 ieee80211_queue_work(&rx->local->hw, &sdata->work); 3661 if (rx->sta) 3662 rx->sta->rx_stats.packets++; 3663 3664 return RX_QUEUED; 3665} 3666 3667static ieee80211_rx_result debug_noinline 3668ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 3669{ 3670 struct ieee80211_sub_if_data *sdata = rx->sdata; 3671 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3672 __le16 stype; 3673 3674 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 3675 3676 if (!ieee80211_vif_is_mesh(&sdata->vif) && 3677 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3678 sdata->vif.type != NL80211_IFTYPE_OCB && 3679 sdata->vif.type != NL80211_IFTYPE_STATION) 3680 return RX_DROP_MONITOR; 3681 3682 switch (stype) { 3683 case cpu_to_le16(IEEE80211_STYPE_AUTH): 3684 case cpu_to_le16(IEEE80211_STYPE_BEACON): 3685 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 3686 /* process for all: mesh, mlme, ibss */ 3687 break; 3688 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 3689 if (is_multicast_ether_addr(mgmt->da) && 3690 !is_broadcast_ether_addr(mgmt->da)) 3691 return RX_DROP_MONITOR; 3692 3693 /* process only for station/IBSS */ 3694 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3695 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3696 return RX_DROP_MONITOR; 3697 break; 3698 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 3699 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 3700 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 3701 if (is_multicast_ether_addr(mgmt->da) && 3702 !is_broadcast_ether_addr(mgmt->da)) 3703 return RX_DROP_MONITOR; 3704 3705 /* process only for station */ 3706 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3707 return RX_DROP_MONITOR; 3708 break; 3709 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 3710 /* process only for ibss and mesh */ 3711 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 3712 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3713 return RX_DROP_MONITOR; 3714 break; 3715 default: 3716 return RX_DROP_MONITOR; 3717 } 3718 3719 /* queue up frame and kick off work to process it */ 3720 skb_queue_tail(&sdata->skb_queue, rx->skb); 3721 ieee80211_queue_work(&rx->local->hw, &sdata->work); 3722 if (rx->sta) 3723 rx->sta->rx_stats.packets++; 3724 3725 return RX_QUEUED; 3726} 3727 3728static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 3729 struct ieee80211_rate *rate) 3730{ 3731 struct ieee80211_sub_if_data *sdata; 3732 struct ieee80211_local *local = rx->local; 3733 struct sk_buff *skb = rx->skb, *skb2; 3734 struct net_device *prev_dev = NULL; 3735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3736 int needed_headroom; 3737 3738 /* 3739 * If cooked monitor has been processed already, then 3740 * don't do it again. If not, set the flag. 3741 */ 3742 if (rx->flags & IEEE80211_RX_CMNTR) 3743 goto out_free_skb; 3744 rx->flags |= IEEE80211_RX_CMNTR; 3745 3746 /* If there are no cooked monitor interfaces, just free the SKB */ 3747 if (!local->cooked_mntrs) 3748 goto out_free_skb; 3749 3750 /* vendor data is long removed here */ 3751 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA; 3752 /* room for the radiotap header based on driver features */ 3753 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb); 3754 3755 if (skb_headroom(skb) < needed_headroom && 3756 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) 3757 goto out_free_skb; 3758 3759 /* prepend radiotap information */ 3760 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 3761 false); 3762 3763 skb_reset_mac_header(skb); 3764 skb->ip_summed = CHECKSUM_UNNECESSARY; 3765 skb->pkt_type = PACKET_OTHERHOST; 3766 skb->protocol = htons(ETH_P_802_2); 3767 3768 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3769 if (!ieee80211_sdata_running(sdata)) 3770 continue; 3771 3772 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 3773 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)) 3774 continue; 3775 3776 if (prev_dev) { 3777 skb2 = skb_clone(skb, GFP_ATOMIC); 3778 if (skb2) { 3779 skb2->dev = prev_dev; 3780 netif_receive_skb(skb2); 3781 } 3782 } 3783 3784 prev_dev = sdata->dev; 3785 ieee80211_rx_stats(sdata->dev, skb->len); 3786 } 3787 3788 if (prev_dev) { 3789 skb->dev = prev_dev; 3790 netif_receive_skb(skb); 3791 return; 3792 } 3793 3794 out_free_skb: 3795 dev_kfree_skb(skb); 3796} 3797 3798static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 3799 ieee80211_rx_result res) 3800{ 3801 switch (res) { 3802 case RX_DROP_MONITOR: 3803 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3804 if (rx->sta) 3805 rx->sta->rx_stats.dropped++; 3806 fallthrough; 3807 case RX_CONTINUE: { 3808 struct ieee80211_rate *rate = NULL; 3809 struct ieee80211_supported_band *sband; 3810 struct ieee80211_rx_status *status; 3811 3812 status = IEEE80211_SKB_RXCB((rx->skb)); 3813 3814 sband = rx->local->hw.wiphy->bands[status->band]; 3815 if (status->encoding == RX_ENC_LEGACY) 3816 rate = &sband->bitrates[status->rate_idx]; 3817 3818 ieee80211_rx_cooked_monitor(rx, rate); 3819 break; 3820 } 3821 case RX_DROP_UNUSABLE: 3822 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3823 if (rx->sta) 3824 rx->sta->rx_stats.dropped++; 3825 dev_kfree_skb(rx->skb); 3826 break; 3827 case RX_QUEUED: 3828 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 3829 break; 3830 } 3831} 3832 3833static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 3834 struct sk_buff_head *frames) 3835{ 3836 ieee80211_rx_result res = RX_DROP_MONITOR; 3837 struct sk_buff *skb; 3838 3839#define CALL_RXH(rxh) \ 3840 do { \ 3841 res = rxh(rx); \ 3842 if (res != RX_CONTINUE) \ 3843 goto rxh_next; \ 3844 } while (0) 3845 3846 /* Lock here to avoid hitting all of the data used in the RX 3847 * path (e.g. key data, station data, ...) concurrently when 3848 * a frame is released from the reorder buffer due to timeout 3849 * from the timer, potentially concurrently with RX from the 3850 * driver. 3851 */ 3852 spin_lock_bh(&rx->local->rx_path_lock); 3853 3854 while ((skb = __skb_dequeue(frames))) { 3855 /* 3856 * all the other fields are valid across frames 3857 * that belong to an aMPDU since they are on the 3858 * same TID from the same station 3859 */ 3860 rx->skb = skb; 3861 3862 CALL_RXH(ieee80211_rx_h_check_more_data); 3863 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 3864 CALL_RXH(ieee80211_rx_h_sta_process); 3865 CALL_RXH(ieee80211_rx_h_decrypt); 3866 CALL_RXH(ieee80211_rx_h_defragment); 3867 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 3868 /* must be after MMIC verify so header is counted in MPDU mic */ 3869#ifdef CONFIG_MAC80211_MESH 3870 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 3871 CALL_RXH(ieee80211_rx_h_mesh_fwding); 3872#endif 3873 CALL_RXH(ieee80211_rx_h_amsdu); 3874 CALL_RXH(ieee80211_rx_h_data); 3875 3876 /* special treatment -- needs the queue */ 3877 res = ieee80211_rx_h_ctrl(rx, frames); 3878 if (res != RX_CONTINUE) 3879 goto rxh_next; 3880 3881 CALL_RXH(ieee80211_rx_h_mgmt_check); 3882 CALL_RXH(ieee80211_rx_h_action); 3883 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 3884 CALL_RXH(ieee80211_rx_h_action_post_userspace); 3885 CALL_RXH(ieee80211_rx_h_action_return); 3886 CALL_RXH(ieee80211_rx_h_ext); 3887 CALL_RXH(ieee80211_rx_h_mgmt); 3888 3889 rxh_next: 3890 ieee80211_rx_handlers_result(rx, res); 3891 3892#undef CALL_RXH 3893 } 3894 3895 spin_unlock_bh(&rx->local->rx_path_lock); 3896} 3897 3898static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 3899{ 3900 struct sk_buff_head reorder_release; 3901 ieee80211_rx_result res = RX_DROP_MONITOR; 3902 3903 __skb_queue_head_init(&reorder_release); 3904 3905#define CALL_RXH(rxh) \ 3906 do { \ 3907 res = rxh(rx); \ 3908 if (res != RX_CONTINUE) \ 3909 goto rxh_next; \ 3910 } while (0) 3911 3912 CALL_RXH(ieee80211_rx_h_check_dup); 3913 CALL_RXH(ieee80211_rx_h_check); 3914 3915 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 3916 3917 ieee80211_rx_handlers(rx, &reorder_release); 3918 return; 3919 3920 rxh_next: 3921 ieee80211_rx_handlers_result(rx, res); 3922 3923#undef CALL_RXH 3924} 3925 3926/* 3927 * This function makes calls into the RX path, therefore 3928 * it has to be invoked under RCU read lock. 3929 */ 3930void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 3931{ 3932 struct sk_buff_head frames; 3933 struct ieee80211_rx_data rx = { 3934 .sta = sta, 3935 .sdata = sta->sdata, 3936 .local = sta->local, 3937 /* This is OK -- must be QoS data frame */ 3938 .security_idx = tid, 3939 .seqno_idx = tid, 3940 }; 3941 struct tid_ampdu_rx *tid_agg_rx; 3942 3943 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3944 if (!tid_agg_rx) 3945 return; 3946 3947 __skb_queue_head_init(&frames); 3948 3949 spin_lock(&tid_agg_rx->reorder_lock); 3950 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 3951 spin_unlock(&tid_agg_rx->reorder_lock); 3952 3953 if (!skb_queue_empty(&frames)) { 3954 struct ieee80211_event event = { 3955 .type = BA_FRAME_TIMEOUT, 3956 .u.ba.tid = tid, 3957 .u.ba.sta = &sta->sta, 3958 }; 3959 drv_event_callback(rx.local, rx.sdata, &event); 3960 } 3961 3962 ieee80211_rx_handlers(&rx, &frames); 3963} 3964 3965void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 3966 u16 ssn, u64 filtered, 3967 u16 received_mpdus) 3968{ 3969 struct sta_info *sta; 3970 struct tid_ampdu_rx *tid_agg_rx; 3971 struct sk_buff_head frames; 3972 struct ieee80211_rx_data rx = { 3973 /* This is OK -- must be QoS data frame */ 3974 .security_idx = tid, 3975 .seqno_idx = tid, 3976 }; 3977 int i, diff; 3978 3979 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 3980 return; 3981 3982 __skb_queue_head_init(&frames); 3983 3984 sta = container_of(pubsta, struct sta_info, sta); 3985 3986 rx.sta = sta; 3987 rx.sdata = sta->sdata; 3988 rx.local = sta->local; 3989 3990 rcu_read_lock(); 3991 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3992 if (!tid_agg_rx) 3993 goto out; 3994 3995 spin_lock_bh(&tid_agg_rx->reorder_lock); 3996 3997 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 3998 int release; 3999 4000 /* release all frames in the reorder buffer */ 4001 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4002 IEEE80211_SN_MODULO; 4003 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4004 release, &frames); 4005 /* update ssn to match received ssn */ 4006 tid_agg_rx->head_seq_num = ssn; 4007 } else { 4008 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4009 &frames); 4010 } 4011 4012 /* handle the case that received ssn is behind the mac ssn. 4013 * it can be tid_agg_rx->buf_size behind and still be valid */ 4014 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4015 if (diff >= tid_agg_rx->buf_size) { 4016 tid_agg_rx->reorder_buf_filtered = 0; 4017 goto release; 4018 } 4019 filtered = filtered >> diff; 4020 ssn += diff; 4021 4022 /* update bitmap */ 4023 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4024 int index = (ssn + i) % tid_agg_rx->buf_size; 4025 4026 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4027 if (filtered & BIT_ULL(i)) 4028 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4029 } 4030 4031 /* now process also frames that the filter marking released */ 4032 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4033 4034release: 4035 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4036 4037 ieee80211_rx_handlers(&rx, &frames); 4038 4039 out: 4040 rcu_read_unlock(); 4041} 4042EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4043 4044/* main receive path */ 4045 4046static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4047{ 4048 struct ieee80211_sub_if_data *sdata = rx->sdata; 4049 struct sk_buff *skb = rx->skb; 4050 struct ieee80211_hdr *hdr = (void *)skb->data; 4051 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4052 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4053 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4054 ieee80211_is_s1g_beacon(hdr->frame_control); 4055 4056 switch (sdata->vif.type) { 4057 case NL80211_IFTYPE_STATION: 4058 if (!bssid && !sdata->u.mgd.use_4addr) 4059 return false; 4060 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4061 return false; 4062 if (multicast) 4063 return true; 4064 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4065 case NL80211_IFTYPE_ADHOC: 4066 if (!bssid) 4067 return false; 4068 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4069 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4070 !is_valid_ether_addr(hdr->addr2)) 4071 return false; 4072 if (ieee80211_is_beacon(hdr->frame_control)) 4073 return true; 4074 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4075 return false; 4076 if (!multicast && 4077 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4078 return false; 4079 if (!rx->sta) { 4080 int rate_idx; 4081 if (status->encoding != RX_ENC_LEGACY) 4082 rate_idx = 0; /* TODO: HT/VHT rates */ 4083 else 4084 rate_idx = status->rate_idx; 4085 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4086 BIT(rate_idx)); 4087 } 4088 return true; 4089 case NL80211_IFTYPE_OCB: 4090 if (!bssid) 4091 return false; 4092 if (!ieee80211_is_data_present(hdr->frame_control)) 4093 return false; 4094 if (!is_broadcast_ether_addr(bssid)) 4095 return false; 4096 if (!multicast && 4097 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4098 return false; 4099 if (!rx->sta) { 4100 int rate_idx; 4101 if (status->encoding != RX_ENC_LEGACY) 4102 rate_idx = 0; /* TODO: HT rates */ 4103 else 4104 rate_idx = status->rate_idx; 4105 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4106 BIT(rate_idx)); 4107 } 4108 return true; 4109 case NL80211_IFTYPE_MESH_POINT: 4110 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4111 return false; 4112 if (multicast) 4113 return true; 4114 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4115 case NL80211_IFTYPE_AP_VLAN: 4116 case NL80211_IFTYPE_AP: 4117 if (!bssid) 4118 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4119 4120 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { 4121 /* 4122 * Accept public action frames even when the 4123 * BSSID doesn't match, this is used for P2P 4124 * and location updates. Note that mac80211 4125 * itself never looks at these frames. 4126 */ 4127 if (!multicast && 4128 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4129 return false; 4130 if (ieee80211_is_public_action(hdr, skb->len)) 4131 return true; 4132 return ieee80211_is_beacon(hdr->frame_control); 4133 } 4134 4135 if (!ieee80211_has_tods(hdr->frame_control)) { 4136 /* ignore data frames to TDLS-peers */ 4137 if (ieee80211_is_data(hdr->frame_control)) 4138 return false; 4139 /* ignore action frames to TDLS-peers */ 4140 if (ieee80211_is_action(hdr->frame_control) && 4141 !is_broadcast_ether_addr(bssid) && 4142 !ether_addr_equal(bssid, hdr->addr1)) 4143 return false; 4144 } 4145 4146 /* 4147 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4148 * the BSSID - we've checked that already but may have accepted 4149 * the wildcard (ff:ff:ff:ff:ff:ff). 4150 * 4151 * It also says: 4152 * The BSSID of the Data frame is determined as follows: 4153 * a) If the STA is contained within an AP or is associated 4154 * with an AP, the BSSID is the address currently in use 4155 * by the STA contained in the AP. 4156 * 4157 * So we should not accept data frames with an address that's 4158 * multicast. 4159 * 4160 * Accepting it also opens a security problem because stations 4161 * could encrypt it with the GTK and inject traffic that way. 4162 */ 4163 if (ieee80211_is_data(hdr->frame_control) && multicast) 4164 return false; 4165 4166 return true; 4167 case NL80211_IFTYPE_WDS: 4168 if (bssid || !ieee80211_is_data(hdr->frame_control)) 4169 return false; 4170 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2); 4171 case NL80211_IFTYPE_P2P_DEVICE: 4172 return ieee80211_is_public_action(hdr, skb->len) || 4173 ieee80211_is_probe_req(hdr->frame_control) || 4174 ieee80211_is_probe_resp(hdr->frame_control) || 4175 ieee80211_is_beacon(hdr->frame_control); 4176 case NL80211_IFTYPE_NAN: 4177 /* Currently no frames on NAN interface are allowed */ 4178 return false; 4179 default: 4180 break; 4181 } 4182 4183 WARN_ON_ONCE(1); 4184 return false; 4185} 4186 4187void ieee80211_check_fast_rx(struct sta_info *sta) 4188{ 4189 struct ieee80211_sub_if_data *sdata = sta->sdata; 4190 struct ieee80211_local *local = sdata->local; 4191 struct ieee80211_key *key; 4192 struct ieee80211_fast_rx fastrx = { 4193 .dev = sdata->dev, 4194 .vif_type = sdata->vif.type, 4195 .control_port_protocol = sdata->control_port_protocol, 4196 }, *old, *new = NULL; 4197 bool assign = false; 4198 4199 /* use sparse to check that we don't return without updating */ 4200 __acquire(check_fast_rx); 4201 4202 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4203 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4204 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4205 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4206 4207 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4208 4209 /* fast-rx doesn't do reordering */ 4210 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4211 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4212 goto clear; 4213 4214 switch (sdata->vif.type) { 4215 case NL80211_IFTYPE_STATION: 4216 if (sta->sta.tdls) { 4217 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4218 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4219 fastrx.expected_ds_bits = 0; 4220 } else { 4221 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4222 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4223 fastrx.expected_ds_bits = 4224 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4225 } 4226 4227 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4228 fastrx.expected_ds_bits |= 4229 cpu_to_le16(IEEE80211_FCTL_TODS); 4230 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4231 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4232 } 4233 4234 if (!sdata->u.mgd.powersave) 4235 break; 4236 4237 /* software powersave is a huge mess, avoid all of it */ 4238 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4239 goto clear; 4240 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4241 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4242 goto clear; 4243 break; 4244 case NL80211_IFTYPE_AP_VLAN: 4245 case NL80211_IFTYPE_AP: 4246 /* parallel-rx requires this, at least with calls to 4247 * ieee80211_sta_ps_transition() 4248 */ 4249 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4250 goto clear; 4251 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4252 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4253 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4254 4255 fastrx.internal_forward = 4256 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4257 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4258 !sdata->u.vlan.sta); 4259 4260 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4261 sdata->u.vlan.sta) { 4262 fastrx.expected_ds_bits |= 4263 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4264 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4265 fastrx.internal_forward = 0; 4266 } 4267 4268 break; 4269 default: 4270 goto clear; 4271 } 4272 4273 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4274 goto clear; 4275 4276 rcu_read_lock(); 4277 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4278 if (!key) 4279 key = rcu_dereference(sdata->default_unicast_key); 4280 if (key) { 4281 switch (key->conf.cipher) { 4282 case WLAN_CIPHER_SUITE_TKIP: 4283 /* we don't want to deal with MMIC in fast-rx */ 4284 goto clear_rcu; 4285 case WLAN_CIPHER_SUITE_CCMP: 4286 case WLAN_CIPHER_SUITE_CCMP_256: 4287 case WLAN_CIPHER_SUITE_GCMP: 4288 case WLAN_CIPHER_SUITE_GCMP_256: 4289 break; 4290 default: 4291 /* We also don't want to deal with 4292 * WEP or cipher scheme. 4293 */ 4294 goto clear_rcu; 4295 } 4296 4297 fastrx.key = true; 4298 fastrx.icv_len = key->conf.icv_len; 4299 } 4300 4301 assign = true; 4302 clear_rcu: 4303 rcu_read_unlock(); 4304 clear: 4305 __release(check_fast_rx); 4306 4307 if (assign) 4308 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4309 4310 spin_lock_bh(&sta->lock); 4311 old = rcu_dereference_protected(sta->fast_rx, true); 4312 rcu_assign_pointer(sta->fast_rx, new); 4313 spin_unlock_bh(&sta->lock); 4314 4315 if (old) 4316 kfree_rcu(old, rcu_head); 4317} 4318 4319void ieee80211_clear_fast_rx(struct sta_info *sta) 4320{ 4321 struct ieee80211_fast_rx *old; 4322 4323 spin_lock_bh(&sta->lock); 4324 old = rcu_dereference_protected(sta->fast_rx, true); 4325 RCU_INIT_POINTER(sta->fast_rx, NULL); 4326 spin_unlock_bh(&sta->lock); 4327 4328 if (old) 4329 kfree_rcu(old, rcu_head); 4330} 4331 4332void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4333{ 4334 struct ieee80211_local *local = sdata->local; 4335 struct sta_info *sta; 4336 4337 lockdep_assert_held(&local->sta_mtx); 4338 4339 list_for_each_entry(sta, &local->sta_list, list) { 4340 if (sdata != sta->sdata && 4341 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4342 continue; 4343 ieee80211_check_fast_rx(sta); 4344 } 4345} 4346 4347void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4348{ 4349 struct ieee80211_local *local = sdata->local; 4350 4351 mutex_lock(&local->sta_mtx); 4352 __ieee80211_check_fast_rx_iface(sdata); 4353 mutex_unlock(&local->sta_mtx); 4354} 4355 4356static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4357 struct ieee80211_fast_rx *fast_rx) 4358{ 4359 struct sk_buff *skb = rx->skb; 4360 struct ieee80211_hdr *hdr = (void *)skb->data; 4361 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4362 struct sta_info *sta = rx->sta; 4363 int orig_len = skb->len; 4364 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4365 int snap_offs = hdrlen; 4366 struct { 4367 u8 snap[sizeof(rfc1042_header)]; 4368 __be16 proto; 4369 } *payload __aligned(2); 4370 struct { 4371 u8 da[ETH_ALEN]; 4372 u8 sa[ETH_ALEN]; 4373 } addrs __aligned(2); 4374 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats; 4375 4376 if (fast_rx->uses_rss) 4377 stats = this_cpu_ptr(sta->pcpu_rx_stats); 4378 4379 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4380 * to a common data structure; drivers can implement that per queue 4381 * but we don't have that information in mac80211 4382 */ 4383 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4384 return false; 4385 4386#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4387 4388 /* If using encryption, we also need to have: 4389 * - PN_VALIDATED: similar, but the implementation is tricky 4390 * - DECRYPTED: necessary for PN_VALIDATED 4391 */ 4392 if (fast_rx->key && 4393 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4394 return false; 4395 4396 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4397 return false; 4398 4399 if (unlikely(ieee80211_is_frag(hdr))) 4400 return false; 4401 4402 /* Since our interface address cannot be multicast, this 4403 * implicitly also rejects multicast frames without the 4404 * explicit check. 4405 * 4406 * We shouldn't get any *data* frames not addressed to us 4407 * (AP mode will accept multicast *management* frames), but 4408 * punting here will make it go through the full checks in 4409 * ieee80211_accept_frame(). 4410 */ 4411 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4412 return false; 4413 4414 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4415 IEEE80211_FCTL_TODS)) != 4416 fast_rx->expected_ds_bits) 4417 return false; 4418 4419 /* assign the key to drop unencrypted frames (later) 4420 * and strip the IV/MIC if necessary 4421 */ 4422 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4423 /* GCMP header length is the same */ 4424 snap_offs += IEEE80211_CCMP_HDR_LEN; 4425 } 4426 4427 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) { 4428 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4429 goto drop; 4430 4431 payload = (void *)(skb->data + snap_offs); 4432 4433 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4434 return false; 4435 4436 /* Don't handle these here since they require special code. 4437 * Accept AARP and IPX even though they should come with a 4438 * bridge-tunnel header - but if we get them this way then 4439 * there's little point in discarding them. 4440 */ 4441 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4442 payload->proto == fast_rx->control_port_protocol)) 4443 return false; 4444 } 4445 4446 /* after this point, don't punt to the slowpath! */ 4447 4448 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 4449 pskb_trim(skb, skb->len - fast_rx->icv_len)) 4450 goto drop; 4451 4452 /* statistics part of ieee80211_rx_h_sta_process() */ 4453 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4454 stats->last_signal = status->signal; 4455 if (!fast_rx->uses_rss) 4456 ewma_signal_add(&sta->rx_stats_avg.signal, 4457 -status->signal); 4458 } 4459 4460 if (status->chains) { 4461 int i; 4462 4463 stats->chains = status->chains; 4464 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4465 int signal = status->chain_signal[i]; 4466 4467 if (!(status->chains & BIT(i))) 4468 continue; 4469 4470 stats->chain_signal_last[i] = signal; 4471 if (!fast_rx->uses_rss) 4472 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], 4473 -signal); 4474 } 4475 } 4476 /* end of statistics */ 4477 4478 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 4479 goto drop; 4480 4481 if (status->rx_flags & IEEE80211_RX_AMSDU) { 4482 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 4483 RX_QUEUED) 4484 goto drop; 4485 4486 return true; 4487 } 4488 4489 stats->last_rx = jiffies; 4490 stats->last_rate = sta_stats_encode_rate(status); 4491 4492 stats->fragments++; 4493 stats->packets++; 4494 4495 /* do the header conversion - first grab the addresses */ 4496 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 4497 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 4498 /* remove the SNAP but leave the ethertype */ 4499 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 4500 /* push the addresses in front */ 4501 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 4502 4503 skb->dev = fast_rx->dev; 4504 4505 ieee80211_rx_stats(fast_rx->dev, skb->len); 4506 4507 /* The seqno index has the same property as needed 4508 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4509 * for non-QoS-data frames. Here we know it's a data 4510 * frame, so count MSDUs. 4511 */ 4512 u64_stats_update_begin(&stats->syncp); 4513 stats->msdu[rx->seqno_idx]++; 4514 stats->bytes += orig_len; 4515 u64_stats_update_end(&stats->syncp); 4516 4517 if (fast_rx->internal_forward) { 4518 struct sk_buff *xmit_skb = NULL; 4519 if (is_multicast_ether_addr(addrs.da)) { 4520 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4521 } else if (!ether_addr_equal(addrs.da, addrs.sa) && 4522 sta_info_get(rx->sdata, addrs.da)) { 4523 xmit_skb = skb; 4524 skb = NULL; 4525 } 4526 4527 if (xmit_skb) { 4528 /* 4529 * Send to wireless media and increase priority by 256 4530 * to keep the received priority instead of 4531 * reclassifying the frame (see cfg80211_classify8021d). 4532 */ 4533 xmit_skb->priority += 256; 4534 xmit_skb->protocol = htons(ETH_P_802_3); 4535 skb_reset_network_header(xmit_skb); 4536 skb_reset_mac_header(xmit_skb); 4537 dev_queue_xmit(xmit_skb); 4538 } 4539 4540 if (!skb) 4541 return true; 4542 } 4543 4544 /* deliver to local stack */ 4545 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4546 memset(skb->cb, 0, sizeof(skb->cb)); 4547 if (rx->list) 4548 list_add_tail(&skb->list, rx->list); 4549 else 4550 netif_receive_skb(skb); 4551 4552 return true; 4553 drop: 4554 dev_kfree_skb(skb); 4555 stats->dropped++; 4556 return true; 4557} 4558 4559/* 4560 * This function returns whether or not the SKB 4561 * was destined for RX processing or not, which, 4562 * if consume is true, is equivalent to whether 4563 * or not the skb was consumed. 4564 */ 4565static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 4566 struct sk_buff *skb, bool consume) 4567{ 4568 struct ieee80211_local *local = rx->local; 4569 struct ieee80211_sub_if_data *sdata = rx->sdata; 4570 4571 rx->skb = skb; 4572 4573 /* See if we can do fast-rx; if we have to copy we already lost, 4574 * so punt in that case. We should never have to deliver a data 4575 * frame to multiple interfaces anyway. 4576 * 4577 * We skip the ieee80211_accept_frame() call and do the necessary 4578 * checking inside ieee80211_invoke_fast_rx(). 4579 */ 4580 if (consume && rx->sta) { 4581 struct ieee80211_fast_rx *fast_rx; 4582 4583 fast_rx = rcu_dereference(rx->sta->fast_rx); 4584 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 4585 return true; 4586 } 4587 4588 if (!ieee80211_accept_frame(rx)) 4589 return false; 4590 4591 if (!consume) { 4592 skb = skb_copy(skb, GFP_ATOMIC); 4593 if (!skb) { 4594 if (net_ratelimit()) 4595 wiphy_debug(local->hw.wiphy, 4596 "failed to copy skb for %s\n", 4597 sdata->name); 4598 return true; 4599 } 4600 4601 rx->skb = skb; 4602 } 4603 4604 ieee80211_invoke_rx_handlers(rx); 4605 return true; 4606} 4607 4608/* 4609 * This is the actual Rx frames handler. as it belongs to Rx path it must 4610 * be called with rcu_read_lock protection. 4611 */ 4612static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 4613 struct ieee80211_sta *pubsta, 4614 struct sk_buff *skb, 4615 struct list_head *list) 4616{ 4617 struct ieee80211_local *local = hw_to_local(hw); 4618 struct ieee80211_sub_if_data *sdata; 4619 struct ieee80211_hdr *hdr; 4620 __le16 fc; 4621 struct ieee80211_rx_data rx; 4622 struct ieee80211_sub_if_data *prev; 4623 struct rhlist_head *tmp; 4624 int err = 0; 4625 4626 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 4627 memset(&rx, 0, sizeof(rx)); 4628 rx.skb = skb; 4629 rx.local = local; 4630 rx.list = list; 4631 4632 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 4633 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 4634 4635 if (ieee80211_is_mgmt(fc)) { 4636 /* drop frame if too short for header */ 4637 if (skb->len < ieee80211_hdrlen(fc)) 4638 err = -ENOBUFS; 4639 else 4640 err = skb_linearize(skb); 4641 } else { 4642 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 4643 } 4644 4645 if (err) { 4646 dev_kfree_skb(skb); 4647 return; 4648 } 4649 4650 hdr = (struct ieee80211_hdr *)skb->data; 4651 ieee80211_parse_qos(&rx); 4652 ieee80211_verify_alignment(&rx); 4653 4654 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 4655 ieee80211_is_beacon(hdr->frame_control) || 4656 ieee80211_is_s1g_beacon(hdr->frame_control))) 4657 ieee80211_scan_rx(local, skb); 4658 4659 if (ieee80211_is_data(fc)) { 4660 struct sta_info *sta, *prev_sta; 4661 4662 if (pubsta) { 4663 rx.sta = container_of(pubsta, struct sta_info, sta); 4664 rx.sdata = rx.sta->sdata; 4665 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4666 return; 4667 goto out; 4668 } 4669 4670 prev_sta = NULL; 4671 4672 for_each_sta_info(local, hdr->addr2, sta, tmp) { 4673 if (!prev_sta) { 4674 prev_sta = sta; 4675 continue; 4676 } 4677 4678 rx.sta = prev_sta; 4679 rx.sdata = prev_sta->sdata; 4680 ieee80211_prepare_and_rx_handle(&rx, skb, false); 4681 4682 prev_sta = sta; 4683 } 4684 4685 if (prev_sta) { 4686 rx.sta = prev_sta; 4687 rx.sdata = prev_sta->sdata; 4688 4689 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4690 return; 4691 goto out; 4692 } 4693 } 4694 4695 prev = NULL; 4696 4697 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4698 if (!ieee80211_sdata_running(sdata)) 4699 continue; 4700 4701 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 4702 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4703 continue; 4704 4705 /* 4706 * frame is destined for this interface, but if it's 4707 * not also for the previous one we handle that after 4708 * the loop to avoid copying the SKB once too much 4709 */ 4710 4711 if (!prev) { 4712 prev = sdata; 4713 continue; 4714 } 4715 4716 rx.sta = sta_info_get_bss(prev, hdr->addr2); 4717 rx.sdata = prev; 4718 ieee80211_prepare_and_rx_handle(&rx, skb, false); 4719 4720 prev = sdata; 4721 } 4722 4723 if (prev) { 4724 rx.sta = sta_info_get_bss(prev, hdr->addr2); 4725 rx.sdata = prev; 4726 4727 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4728 return; 4729 } 4730 4731 out: 4732 dev_kfree_skb(skb); 4733} 4734 4735/* 4736 * This is the receive path handler. It is called by a low level driver when an 4737 * 802.11 MPDU is received from the hardware. 4738 */ 4739void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 4740 struct sk_buff *skb, struct list_head *list) 4741{ 4742 struct ieee80211_local *local = hw_to_local(hw); 4743 struct ieee80211_rate *rate = NULL; 4744 struct ieee80211_supported_band *sband; 4745 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4746 4747 WARN_ON_ONCE(softirq_count() == 0); 4748 4749 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 4750 goto drop; 4751 4752 sband = local->hw.wiphy->bands[status->band]; 4753 if (WARN_ON(!sband)) 4754 goto drop; 4755 4756 /* 4757 * If we're suspending, it is possible although not too likely 4758 * that we'd be receiving frames after having already partially 4759 * quiesced the stack. We can't process such frames then since 4760 * that might, for example, cause stations to be added or other 4761 * driver callbacks be invoked. 4762 */ 4763 if (unlikely(local->quiescing || local->suspended)) 4764 goto drop; 4765 4766 /* We might be during a HW reconfig, prevent Rx for the same reason */ 4767 if (unlikely(local->in_reconfig)) 4768 goto drop; 4769 4770 /* 4771 * The same happens when we're not even started, 4772 * but that's worth a warning. 4773 */ 4774 if (WARN_ON(!local->started)) 4775 goto drop; 4776 4777 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 4778 /* 4779 * Validate the rate, unless a PLCP error means that 4780 * we probably can't have a valid rate here anyway. 4781 */ 4782 4783 switch (status->encoding) { 4784 case RX_ENC_HT: 4785 /* 4786 * rate_idx is MCS index, which can be [0-76] 4787 * as documented on: 4788 * 4789 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 4790 * 4791 * Anything else would be some sort of driver or 4792 * hardware error. The driver should catch hardware 4793 * errors. 4794 */ 4795 if (WARN(status->rate_idx > 76, 4796 "Rate marked as an HT rate but passed " 4797 "status->rate_idx is not " 4798 "an MCS index [0-76]: %d (0x%02x)\n", 4799 status->rate_idx, 4800 status->rate_idx)) 4801 goto drop; 4802 break; 4803 case RX_ENC_VHT: 4804 if (WARN_ONCE(status->rate_idx > 11 || 4805 !status->nss || 4806 status->nss > 8, 4807 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 4808 status->rate_idx, status->nss)) 4809 goto drop; 4810 break; 4811 case RX_ENC_HE: 4812 if (WARN_ONCE(status->rate_idx > 11 || 4813 !status->nss || 4814 status->nss > 8, 4815 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 4816 status->rate_idx, status->nss)) 4817 goto drop; 4818 break; 4819 default: 4820 WARN_ON_ONCE(1); 4821 fallthrough; 4822 case RX_ENC_LEGACY: 4823 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 4824 goto drop; 4825 rate = &sband->bitrates[status->rate_idx]; 4826 } 4827 } 4828 4829 status->rx_flags = 0; 4830 4831 /* 4832 * Frames with failed FCS/PLCP checksum are not returned, 4833 * all other frames are returned without radiotap header 4834 * if it was previously present. 4835 * Also, frames with less than 16 bytes are dropped. 4836 */ 4837 skb = ieee80211_rx_monitor(local, skb, rate); 4838 if (!skb) 4839 return; 4840 4841 ieee80211_tpt_led_trig_rx(local, 4842 ((struct ieee80211_hdr *)skb->data)->frame_control, 4843 skb->len); 4844 4845 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 4846 4847 return; 4848 drop: 4849 kfree_skb(skb); 4850} 4851EXPORT_SYMBOL(ieee80211_rx_list); 4852 4853void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 4854 struct sk_buff *skb, struct napi_struct *napi) 4855{ 4856 struct sk_buff *tmp; 4857 LIST_HEAD(list); 4858 4859 4860 /* 4861 * key references and virtual interfaces are protected using RCU 4862 * and this requires that we are in a read-side RCU section during 4863 * receive processing 4864 */ 4865 rcu_read_lock(); 4866 ieee80211_rx_list(hw, pubsta, skb, &list); 4867 rcu_read_unlock(); 4868 4869 if (!napi) { 4870 netif_receive_skb_list(&list); 4871 return; 4872 } 4873 4874 list_for_each_entry_safe(skb, tmp, &list, list) { 4875 skb_list_del_init(skb); 4876 napi_gro_receive(napi, skb); 4877 } 4878} 4879EXPORT_SYMBOL(ieee80211_rx_napi); 4880 4881/* This is a version of the rx handler that can be called from hard irq 4882 * context. Post the skb on the queue and schedule the tasklet */ 4883void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 4884{ 4885 struct ieee80211_local *local = hw_to_local(hw); 4886 4887 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 4888 4889 skb->pkt_type = IEEE80211_RX_MSG; 4890 skb_queue_tail(&local->skb_queue, skb); 4891 tasklet_schedule(&local->tasklet); 4892} 4893EXPORT_SYMBOL(ieee80211_rx_irqsafe); 4894