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) 2018-2024 Intel Corporation 10 */ 11 12 #include <linux/jiffies.h> 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rcupdate.h> 19 #include <linux/export.h> 20 #include <linux/kcov.h> 21 #include <linux/bitops.h> 22 #include <kunit/visibility.h> 23 #include <net/mac80211.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <linux/unaligned.h> 26 27 #include "ieee80211_i.h" 28 #include "driver-ops.h" 29 #include "led.h" 30 #include "mesh.h" 31 #include "wep.h" 32 #include "wpa.h" 33 #include "tkip.h" 34 #include "wme.h" 35 #include "rate.h" 36 37 /* 38 * monitor mode reception 39 * 40 * This function cleans up the SKB, i.e. it removes all the stuff 41 * only useful for monitoring. 42 */ 43 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb, 44 unsigned int present_fcs_len, 45 unsigned int rtap_space) 46 { 47 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 48 struct ieee80211_hdr *hdr; 49 unsigned int hdrlen; 50 __le16 fc; 51 52 if (present_fcs_len) 53 __pskb_trim(skb, skb->len - present_fcs_len); 54 pskb_pull(skb, rtap_space); 55 56 /* After pulling radiotap header, clear all flags that indicate 57 * info in skb->data. 58 */ 59 status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END | 60 RX_FLAG_RADIOTAP_LSIG | 61 RX_FLAG_RADIOTAP_HE_MU | 62 RX_FLAG_RADIOTAP_HE); 63 64 hdr = (void *)skb->data; 65 fc = hdr->frame_control; 66 67 /* 68 * Remove the HT-Control field (if present) on management 69 * frames after we've sent the frame to monitoring. We 70 * (currently) don't need it, and don't properly parse 71 * frames with it present, due to the assumption of a 72 * fixed management header length. 73 */ 74 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc))) 75 return skb; 76 77 hdrlen = ieee80211_hdrlen(fc); 78 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER); 79 80 if (!pskb_may_pull(skb, hdrlen)) { 81 dev_kfree_skb(skb); 82 return NULL; 83 } 84 85 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data, 86 hdrlen - IEEE80211_HT_CTL_LEN); 87 pskb_pull(skb, IEEE80211_HT_CTL_LEN); 88 89 return skb; 90 } 91 92 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len, 93 unsigned int rtap_space) 94 { 95 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 96 struct ieee80211_hdr *hdr; 97 98 hdr = (void *)(skb->data + rtap_space); 99 100 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 101 RX_FLAG_FAILED_PLCP_CRC | 102 RX_FLAG_ONLY_MONITOR | 103 RX_FLAG_NO_PSDU)) 104 return true; 105 106 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space)) 107 return true; 108 109 if (ieee80211_is_ctl(hdr->frame_control) && 110 !ieee80211_is_pspoll(hdr->frame_control) && 111 !ieee80211_is_back_req(hdr->frame_control)) 112 return true; 113 114 return false; 115 } 116 117 static int 118 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, 119 struct ieee80211_rx_status *status, 120 struct sk_buff *skb) 121 { 122 int len; 123 124 /* always present fields */ 125 len = sizeof(struct ieee80211_radiotap_header) + 8; 126 127 /* allocate extra bitmaps */ 128 if (status->chains) 129 len += 4 * hweight8(status->chains); 130 131 if (ieee80211_have_rx_timestamp(status)) { 132 len = ALIGN(len, 8); 133 len += 8; 134 } 135 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 136 len += 1; 137 138 /* antenna field, if we don't have per-chain info */ 139 if (!status->chains) 140 len += 1; 141 142 /* padding for RX_FLAGS if necessary */ 143 len = ALIGN(len, 2); 144 145 if (status->encoding == RX_ENC_HT) /* HT info */ 146 len += 3; 147 148 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 149 len = ALIGN(len, 4); 150 len += 8; 151 } 152 153 if (status->encoding == RX_ENC_VHT) { 154 len = ALIGN(len, 2); 155 len += 12; 156 } 157 158 if (local->hw.radiotap_timestamp.units_pos >= 0) { 159 len = ALIGN(len, 8); 160 len += 12; 161 } 162 163 if (status->encoding == RX_ENC_HE && 164 status->flag & RX_FLAG_RADIOTAP_HE) { 165 len = ALIGN(len, 2); 166 len += 12; 167 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12); 168 } 169 170 if (status->encoding == RX_ENC_HE && 171 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 172 len = ALIGN(len, 2); 173 len += 12; 174 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12); 175 } 176 177 if (status->flag & RX_FLAG_NO_PSDU) 178 len += 1; 179 180 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 181 len = ALIGN(len, 2); 182 len += 4; 183 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4); 184 } 185 186 if (status->chains) { 187 /* antenna and antenna signal fields */ 188 len += 2 * hweight8(status->chains); 189 } 190 191 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) { 192 int tlv_offset = 0; 193 194 /* 195 * The position to look at depends on the existence (or non- 196 * existence) of other elements, so take that into account... 197 */ 198 if (status->flag & RX_FLAG_RADIOTAP_HE) 199 tlv_offset += 200 sizeof(struct ieee80211_radiotap_he); 201 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 202 tlv_offset += 203 sizeof(struct ieee80211_radiotap_he_mu); 204 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 205 tlv_offset += 206 sizeof(struct ieee80211_radiotap_lsig); 207 208 /* ensure 4 byte alignment for TLV */ 209 len = ALIGN(len, 4); 210 211 /* TLVs until the mac header */ 212 len += skb_mac_header(skb) - &skb->data[tlv_offset]; 213 } 214 215 return len; 216 } 217 218 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata, 219 int link_id, 220 struct sta_info *sta, 221 struct sk_buff *skb) 222 { 223 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 224 225 if (link_id >= 0) { 226 status->link_valid = 1; 227 status->link_id = link_id; 228 } else { 229 status->link_valid = 0; 230 } 231 232 skb_queue_tail(&sdata->skb_queue, skb); 233 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 234 if (sta) 235 sta->deflink.rx_stats.packets++; 236 } 237 238 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata, 239 int link_id, 240 struct sta_info *sta, 241 struct sk_buff *skb) 242 { 243 skb->protocol = 0; 244 __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb); 245 } 246 247 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, 248 struct sk_buff *skb, 249 int rtap_space) 250 { 251 struct { 252 struct ieee80211_hdr_3addr hdr; 253 u8 category; 254 u8 action_code; 255 } __packed __aligned(2) action; 256 257 if (!sdata) 258 return; 259 260 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1); 261 262 if (skb->len < rtap_space + sizeof(action) + 263 VHT_MUMIMO_GROUPS_DATA_LEN) 264 return; 265 266 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) 267 return; 268 269 skb_copy_bits(skb, rtap_space, &action, sizeof(action)); 270 271 if (!ieee80211_is_action(action.hdr.frame_control)) 272 return; 273 274 if (action.category != WLAN_CATEGORY_VHT) 275 return; 276 277 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) 278 return; 279 280 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) 281 return; 282 283 skb = skb_copy(skb, GFP_ATOMIC); 284 if (!skb) 285 return; 286 287 ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb); 288 } 289 290 /* 291 * ieee80211_add_rx_radiotap_header - add radiotap header 292 * 293 * add a radiotap header containing all the fields which the hardware provided. 294 */ 295 static void 296 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 297 struct sk_buff *skb, 298 struct ieee80211_rate *rate, 299 int rtap_len, bool has_fcs) 300 { 301 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 302 struct ieee80211_radiotap_header *rthdr; 303 unsigned char *pos; 304 __le32 *it_present; 305 u32 it_present_val; 306 u16 rx_flags = 0; 307 u16 channel_flags = 0; 308 u32 tlvs_len = 0; 309 int mpdulen, chain; 310 unsigned long chains = status->chains; 311 struct ieee80211_radiotap_he he = {}; 312 struct ieee80211_radiotap_he_mu he_mu = {}; 313 struct ieee80211_radiotap_lsig lsig = {}; 314 315 if (status->flag & RX_FLAG_RADIOTAP_HE) { 316 he = *(struct ieee80211_radiotap_he *)skb->data; 317 skb_pull(skb, sizeof(he)); 318 WARN_ON_ONCE(status->encoding != RX_ENC_HE); 319 } 320 321 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { 322 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; 323 skb_pull(skb, sizeof(he_mu)); 324 } 325 326 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 327 lsig = *(struct ieee80211_radiotap_lsig *)skb->data; 328 skb_pull(skb, sizeof(lsig)); 329 } 330 331 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) { 332 /* data is pointer at tlv all other info was pulled off */ 333 tlvs_len = skb_mac_header(skb) - skb->data; 334 } 335 336 mpdulen = skb->len; 337 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 338 mpdulen += FCS_LEN; 339 340 rthdr = skb_push(skb, rtap_len - tlvs_len); 341 memset(rthdr, 0, rtap_len - tlvs_len); 342 it_present = &rthdr->it_present; 343 344 /* radiotap header, set always present flags */ 345 rthdr->it_len = cpu_to_le16(rtap_len); 346 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 347 BIT(IEEE80211_RADIOTAP_CHANNEL) | 348 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 349 350 if (!status->chains) 351 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 352 353 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 354 it_present_val |= 355 BIT(IEEE80211_RADIOTAP_EXT) | 356 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 357 put_unaligned_le32(it_present_val, it_present); 358 it_present++; 359 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 360 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 361 } 362 363 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 364 it_present_val |= BIT(IEEE80211_RADIOTAP_TLV); 365 366 put_unaligned_le32(it_present_val, it_present); 367 368 /* This references through an offset into it_optional[] rather 369 * than via it_present otherwise later uses of pos will cause 370 * the compiler to think we have walked past the end of the 371 * struct member. 372 */ 373 pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional]; 374 375 /* the order of the following fields is important */ 376 377 /* IEEE80211_RADIOTAP_TSFT */ 378 if (ieee80211_have_rx_timestamp(status)) { 379 /* padding */ 380 while ((pos - (u8 *)rthdr) & 7) 381 *pos++ = 0; 382 put_unaligned_le64( 383 ieee80211_calculate_rx_timestamp(local, status, 384 mpdulen, 0), 385 pos); 386 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT)); 387 pos += 8; 388 } 389 390 /* IEEE80211_RADIOTAP_FLAGS */ 391 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 392 *pos |= IEEE80211_RADIOTAP_F_FCS; 393 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 394 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 395 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) 396 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 397 pos++; 398 399 /* IEEE80211_RADIOTAP_RATE */ 400 if (!rate || status->encoding != RX_ENC_LEGACY) { 401 /* 402 * Without rate information don't add it. If we have, 403 * MCS information is a separate field in radiotap, 404 * added below. The byte here is needed as padding 405 * for the channel though, so initialise it to 0. 406 */ 407 *pos = 0; 408 } else { 409 int shift = 0; 410 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE)); 411 if (status->bw == RATE_INFO_BW_10) 412 shift = 1; 413 else if (status->bw == RATE_INFO_BW_5) 414 shift = 2; 415 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 416 } 417 pos++; 418 419 /* IEEE80211_RADIOTAP_CHANNEL */ 420 /* TODO: frequency offset in KHz */ 421 put_unaligned_le16(status->freq, pos); 422 pos += 2; 423 if (status->bw == RATE_INFO_BW_10) 424 channel_flags |= IEEE80211_CHAN_HALF; 425 else if (status->bw == RATE_INFO_BW_5) 426 channel_flags |= IEEE80211_CHAN_QUARTER; 427 428 if (status->band == NL80211_BAND_5GHZ || 429 status->band == NL80211_BAND_6GHZ) 430 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 431 else if (status->encoding != RX_ENC_LEGACY) 432 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 433 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 434 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 435 else if (rate) 436 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 437 else 438 channel_flags |= IEEE80211_CHAN_2GHZ; 439 put_unaligned_le16(channel_flags, pos); 440 pos += 2; 441 442 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 443 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 444 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 445 *pos = status->signal; 446 rthdr->it_present |= 447 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL)); 448 pos++; 449 } 450 451 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 452 453 if (!status->chains) { 454 /* IEEE80211_RADIOTAP_ANTENNA */ 455 *pos = status->antenna; 456 pos++; 457 } 458 459 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 460 461 /* IEEE80211_RADIOTAP_RX_FLAGS */ 462 /* ensure 2 byte alignment for the 2 byte field as required */ 463 if ((pos - (u8 *)rthdr) & 1) 464 *pos++ = 0; 465 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 466 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 467 put_unaligned_le16(rx_flags, pos); 468 pos += 2; 469 470 if (status->encoding == RX_ENC_HT) { 471 unsigned int stbc; 472 473 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS)); 474 *pos = local->hw.radiotap_mcs_details; 475 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 476 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT; 477 if (status->enc_flags & RX_ENC_FLAG_LDPC) 478 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC; 479 pos++; 480 *pos = 0; 481 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 482 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 483 if (status->bw == RATE_INFO_BW_40) 484 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 485 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 486 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 487 if (status->enc_flags & RX_ENC_FLAG_LDPC) 488 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 489 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; 490 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 491 pos++; 492 *pos++ = status->rate_idx; 493 } 494 495 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 496 u16 flags = 0; 497 498 /* ensure 4 byte alignment */ 499 while ((pos - (u8 *)rthdr) & 3) 500 pos++; 501 rthdr->it_present |= 502 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS)); 503 put_unaligned_le32(status->ampdu_reference, pos); 504 pos += 4; 505 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 506 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 507 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 508 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 509 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 510 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 511 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) 512 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; 513 if (status->flag & RX_FLAG_AMPDU_EOF_BIT) 514 flags |= IEEE80211_RADIOTAP_AMPDU_EOF; 515 put_unaligned_le16(flags, pos); 516 pos += 2; 517 *pos++ = 0; 518 *pos++ = 0; 519 } 520 521 if (status->encoding == RX_ENC_VHT) { 522 u16 known = local->hw.radiotap_vht_details; 523 524 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT)); 525 put_unaligned_le16(known, pos); 526 pos += 2; 527 /* flags */ 528 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 529 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 530 /* in VHT, STBC is binary */ 531 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) 532 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 533 if (status->enc_flags & RX_ENC_FLAG_BF) 534 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 535 pos++; 536 /* bandwidth */ 537 switch (status->bw) { 538 case RATE_INFO_BW_80: 539 *pos++ = 4; 540 break; 541 case RATE_INFO_BW_160: 542 *pos++ = 11; 543 break; 544 case RATE_INFO_BW_40: 545 *pos++ = 1; 546 break; 547 default: 548 *pos++ = 0; 549 } 550 /* MCS/NSS */ 551 *pos = (status->rate_idx << 4) | status->nss; 552 pos += 4; 553 /* coding field */ 554 if (status->enc_flags & RX_ENC_FLAG_LDPC) 555 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 556 pos++; 557 /* group ID */ 558 pos++; 559 /* partial_aid */ 560 pos += 2; 561 } 562 563 if (local->hw.radiotap_timestamp.units_pos >= 0) { 564 u16 accuracy = 0; 565 u8 flags; 566 u64 ts; 567 568 rthdr->it_present |= 569 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP)); 570 571 /* ensure 8 byte alignment */ 572 while ((pos - (u8 *)rthdr) & 7) 573 pos++; 574 575 if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) { 576 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT; 577 ts = status->mactime; 578 } else { 579 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; 580 ts = status->device_timestamp; 581 } 582 583 put_unaligned_le64(ts, pos); 584 pos += sizeof(u64); 585 586 if (local->hw.radiotap_timestamp.accuracy >= 0) { 587 accuracy = local->hw.radiotap_timestamp.accuracy; 588 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; 589 } 590 put_unaligned_le16(accuracy, pos); 591 pos += sizeof(u16); 592 593 *pos++ = local->hw.radiotap_timestamp.units_pos; 594 *pos++ = flags; 595 } 596 597 if (status->encoding == RX_ENC_HE && 598 status->flag & RX_FLAG_RADIOTAP_HE) { 599 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) 600 601 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { 602 he.data6 |= HE_PREP(DATA6_NSTS, 603 FIELD_GET(RX_ENC_FLAG_STBC_MASK, 604 status->enc_flags)); 605 he.data3 |= HE_PREP(DATA3_STBC, 1); 606 } else { 607 he.data6 |= HE_PREP(DATA6_NSTS, status->nss); 608 } 609 610 #define CHECK_GI(s) \ 611 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ 612 (int)NL80211_RATE_INFO_HE_GI_##s) 613 614 CHECK_GI(0_8); 615 CHECK_GI(1_6); 616 CHECK_GI(3_2); 617 618 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); 619 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); 620 he.data3 |= HE_PREP(DATA3_CODING, 621 !!(status->enc_flags & RX_ENC_FLAG_LDPC)); 622 623 he.data5 |= HE_PREP(DATA5_GI, status->he_gi); 624 625 switch (status->bw) { 626 case RATE_INFO_BW_20: 627 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 628 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); 629 break; 630 case RATE_INFO_BW_40: 631 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 632 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); 633 break; 634 case RATE_INFO_BW_80: 635 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 636 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); 637 break; 638 case RATE_INFO_BW_160: 639 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 640 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); 641 break; 642 case RATE_INFO_BW_HE_RU: 643 #define CHECK_RU_ALLOC(s) \ 644 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ 645 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) 646 647 CHECK_RU_ALLOC(26); 648 CHECK_RU_ALLOC(52); 649 CHECK_RU_ALLOC(106); 650 CHECK_RU_ALLOC(242); 651 CHECK_RU_ALLOC(484); 652 CHECK_RU_ALLOC(996); 653 CHECK_RU_ALLOC(2x996); 654 655 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 656 status->he_ru + 4); 657 break; 658 default: 659 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); 660 } 661 662 /* ensure 2 byte alignment */ 663 while ((pos - (u8 *)rthdr) & 1) 664 pos++; 665 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE)); 666 memcpy(pos, &he, sizeof(he)); 667 pos += sizeof(he); 668 } 669 670 if (status->encoding == RX_ENC_HE && 671 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 672 /* ensure 2 byte alignment */ 673 while ((pos - (u8 *)rthdr) & 1) 674 pos++; 675 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU)); 676 memcpy(pos, &he_mu, sizeof(he_mu)); 677 pos += sizeof(he_mu); 678 } 679 680 if (status->flag & RX_FLAG_NO_PSDU) { 681 rthdr->it_present |= 682 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU)); 683 *pos++ = status->zero_length_psdu_type; 684 } 685 686 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 687 /* ensure 2 byte alignment */ 688 while ((pos - (u8 *)rthdr) & 1) 689 pos++; 690 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG)); 691 memcpy(pos, &lsig, sizeof(lsig)); 692 pos += sizeof(lsig); 693 } 694 695 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 696 *pos++ = status->chain_signal[chain]; 697 *pos++ = chain; 698 } 699 } 700 701 static struct sk_buff * 702 ieee80211_make_monitor_skb(struct ieee80211_local *local, 703 struct sk_buff **origskb, 704 struct ieee80211_rate *rate, 705 int rtap_space, bool use_origskb) 706 { 707 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); 708 int rt_hdrlen, needed_headroom; 709 struct sk_buff *skb; 710 711 /* room for the radiotap header based on driver features */ 712 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); 713 needed_headroom = rt_hdrlen - rtap_space; 714 715 if (use_origskb) { 716 /* only need to expand headroom if necessary */ 717 skb = *origskb; 718 *origskb = NULL; 719 720 /* 721 * This shouldn't trigger often because most devices have an 722 * RX header they pull before we get here, and that should 723 * be big enough for our radiotap information. We should 724 * probably export the length to drivers so that we can have 725 * them allocate enough headroom to start with. 726 */ 727 if (skb_headroom(skb) < needed_headroom && 728 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 729 dev_kfree_skb(skb); 730 return NULL; 731 } 732 } else { 733 /* 734 * Need to make a copy and possibly remove radiotap header 735 * and FCS from the original. 736 */ 737 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD, 738 0, GFP_ATOMIC); 739 740 if (!skb) 741 return NULL; 742 } 743 744 /* prepend radiotap information */ 745 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 746 747 skb_reset_mac_header(skb); 748 skb->ip_summed = CHECKSUM_UNNECESSARY; 749 skb->pkt_type = PACKET_OTHERHOST; 750 skb->protocol = htons(ETH_P_802_2); 751 752 return skb; 753 } 754 755 /* 756 * This function copies a received frame to all monitor interfaces and 757 * returns a cleaned-up SKB that no longer includes the FCS nor the 758 * radiotap header the driver might have added. 759 */ 760 static struct sk_buff * 761 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 762 struct ieee80211_rate *rate) 763 { 764 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 765 struct ieee80211_sub_if_data *sdata, *prev_sdata = NULL; 766 struct sk_buff *skb, *monskb = NULL; 767 int present_fcs_len = 0; 768 unsigned int rtap_space = 0; 769 struct ieee80211_sub_if_data *monitor_sdata = 770 rcu_dereference(local->monitor_sdata); 771 bool only_monitor = false; 772 unsigned int min_head_len; 773 774 if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END && 775 !skb_mac_header_was_set(origskb))) { 776 /* with this skb no way to know where frame payload starts */ 777 dev_kfree_skb(origskb); 778 return NULL; 779 } 780 781 if (status->flag & RX_FLAG_RADIOTAP_HE) 782 rtap_space += sizeof(struct ieee80211_radiotap_he); 783 784 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 785 rtap_space += sizeof(struct ieee80211_radiotap_he_mu); 786 787 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 788 rtap_space += sizeof(struct ieee80211_radiotap_lsig); 789 790 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 791 rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space]; 792 793 min_head_len = rtap_space; 794 795 /* 796 * First, we may need to make a copy of the skb because 797 * (1) we need to modify it for radiotap (if not present), and 798 * (2) the other RX handlers will modify the skb we got. 799 * 800 * We don't need to, of course, if we aren't going to return 801 * the SKB because it has a bad FCS/PLCP checksum. 802 */ 803 804 if (!(status->flag & RX_FLAG_NO_PSDU)) { 805 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 806 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { 807 /* driver bug */ 808 WARN_ON(1); 809 dev_kfree_skb(origskb); 810 return NULL; 811 } 812 present_fcs_len = FCS_LEN; 813 } 814 815 /* also consider the hdr->frame_control */ 816 min_head_len += 2; 817 } 818 819 /* ensure that the expected data elements are in skb head */ 820 if (!pskb_may_pull(origskb, min_head_len)) { 821 dev_kfree_skb(origskb); 822 return NULL; 823 } 824 825 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); 826 827 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { 828 if (only_monitor) { 829 dev_kfree_skb(origskb); 830 return NULL; 831 } 832 833 return ieee80211_clean_skb(origskb, present_fcs_len, 834 rtap_space); 835 } 836 837 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); 838 839 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { 840 struct cfg80211_chan_def *chandef; 841 842 chandef = &sdata->vif.bss_conf.chanreq.oper; 843 if (chandef->chan && 844 chandef->chan->center_freq != status->freq) 845 continue; 846 847 if (!prev_sdata) { 848 prev_sdata = sdata; 849 continue; 850 } 851 852 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 853 ieee80211_handle_mu_mimo_mon(sdata, origskb, rtap_space); 854 855 if (!monskb) 856 monskb = ieee80211_make_monitor_skb(local, &origskb, 857 rate, rtap_space, 858 false); 859 if (!monskb) 860 continue; 861 862 skb = skb_clone(monskb, GFP_ATOMIC); 863 if (!skb) 864 continue; 865 866 skb->dev = prev_sdata->dev; 867 dev_sw_netstats_rx_add(skb->dev, skb->len); 868 netif_receive_skb(skb); 869 prev_sdata = sdata; 870 } 871 872 if (prev_sdata) { 873 if (monskb) 874 skb = monskb; 875 else 876 skb = ieee80211_make_monitor_skb(local, &origskb, 877 rate, rtap_space, 878 only_monitor); 879 if (skb) { 880 skb->dev = prev_sdata->dev; 881 dev_sw_netstats_rx_add(skb->dev, skb->len); 882 netif_receive_skb(skb); 883 } 884 } 885 886 if (!origskb) 887 return NULL; 888 889 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space); 890 } 891 892 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 893 { 894 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 895 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 896 int tid, seqno_idx, security_idx; 897 898 /* does the frame have a qos control field? */ 899 if (ieee80211_is_data_qos(hdr->frame_control)) { 900 u8 *qc = ieee80211_get_qos_ctl(hdr); 901 /* frame has qos control */ 902 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 903 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 904 status->rx_flags |= IEEE80211_RX_AMSDU; 905 906 seqno_idx = tid; 907 security_idx = tid; 908 } else { 909 /* 910 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 911 * 912 * Sequence numbers for management frames, QoS data 913 * frames with a broadcast/multicast address in the 914 * Address 1 field, and all non-QoS data frames sent 915 * by QoS STAs are assigned using an additional single 916 * modulo-4096 counter, [...] 917 * 918 * We also use that counter for non-QoS STAs. 919 */ 920 seqno_idx = IEEE80211_NUM_TIDS; 921 security_idx = 0; 922 if (ieee80211_is_mgmt(hdr->frame_control)) 923 security_idx = IEEE80211_NUM_TIDS; 924 tid = 0; 925 } 926 927 rx->seqno_idx = seqno_idx; 928 rx->security_idx = security_idx; 929 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 930 * For now, set skb->priority to 0 for other cases. */ 931 rx->skb->priority = (tid > 7) ? 0 : tid; 932 } 933 934 /** 935 * DOC: Packet alignment 936 * 937 * Drivers always need to pass packets that are aligned to two-byte boundaries 938 * to the stack. 939 * 940 * Additionally, they should, if possible, align the payload data in a way that 941 * guarantees that the contained IP header is aligned to a four-byte 942 * boundary. In the case of regular frames, this simply means aligning the 943 * payload to a four-byte boundary (because either the IP header is directly 944 * contained, or IV/RFC1042 headers that have a length divisible by four are 945 * in front of it). If the payload data is not properly aligned and the 946 * architecture doesn't support efficient unaligned operations, mac80211 947 * will align the data. 948 * 949 * With A-MSDU frames, however, the payload data address must yield two modulo 950 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 951 * push the IP header further back to a multiple of four again. Thankfully, the 952 * specs were sane enough this time around to require padding each A-MSDU 953 * subframe to a length that is a multiple of four. 954 * 955 * Padding like Atheros hardware adds which is between the 802.11 header and 956 * the payload is not supported; the driver is required to move the 802.11 957 * header to be directly in front of the payload in that case. 958 */ 959 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 960 { 961 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 962 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 963 #endif 964 } 965 966 967 /* rx handlers */ 968 969 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 970 { 971 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 972 973 if (is_multicast_ether_addr(hdr->addr1)) 974 return 0; 975 976 return ieee80211_is_robust_mgmt_frame(skb); 977 } 978 979 980 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 981 { 982 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 983 984 if (!is_multicast_ether_addr(hdr->addr1)) 985 return 0; 986 987 return ieee80211_is_robust_mgmt_frame(skb); 988 } 989 990 991 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 992 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 993 { 994 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 995 struct ieee80211_mmie *mmie; 996 struct ieee80211_mmie_16 *mmie16; 997 998 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 999 return -1; 1000 1001 if (!ieee80211_is_robust_mgmt_frame(skb) && 1002 !ieee80211_is_beacon(hdr->frame_control)) 1003 return -1; /* not a robust management frame */ 1004 1005 mmie = (struct ieee80211_mmie *) 1006 (skb->data + skb->len - sizeof(*mmie)); 1007 if (mmie->element_id == WLAN_EID_MMIE && 1008 mmie->length == sizeof(*mmie) - 2) 1009 return le16_to_cpu(mmie->key_id); 1010 1011 mmie16 = (struct ieee80211_mmie_16 *) 1012 (skb->data + skb->len - sizeof(*mmie16)); 1013 if (skb->len >= 24 + sizeof(*mmie16) && 1014 mmie16->element_id == WLAN_EID_MMIE && 1015 mmie16->length == sizeof(*mmie16) - 2) 1016 return le16_to_cpu(mmie16->key_id); 1017 1018 return -1; 1019 } 1020 1021 static int ieee80211_get_keyid(struct sk_buff *skb) 1022 { 1023 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1024 __le16 fc = hdr->frame_control; 1025 int hdrlen = ieee80211_hdrlen(fc); 1026 u8 keyid; 1027 1028 /* WEP, TKIP, CCMP and GCMP */ 1029 if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN)) 1030 return -EINVAL; 1031 1032 skb_copy_bits(skb, hdrlen + 3, &keyid, 1); 1033 1034 keyid >>= 6; 1035 1036 return keyid; 1037 } 1038 1039 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 1040 { 1041 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1042 char *dev_addr = rx->sdata->vif.addr; 1043 1044 if (ieee80211_is_data(hdr->frame_control)) { 1045 if (is_multicast_ether_addr(hdr->addr1)) { 1046 if (ieee80211_has_tods(hdr->frame_control) || 1047 !ieee80211_has_fromds(hdr->frame_control)) 1048 return RX_DROP_MONITOR; 1049 if (ether_addr_equal(hdr->addr3, dev_addr)) 1050 return RX_DROP_MONITOR; 1051 } else { 1052 if (!ieee80211_has_a4(hdr->frame_control)) 1053 return RX_DROP_MONITOR; 1054 if (ether_addr_equal(hdr->addr4, dev_addr)) 1055 return RX_DROP_MONITOR; 1056 } 1057 } 1058 1059 /* If there is not an established peer link and this is not a peer link 1060 * establisment frame, beacon or probe, drop the frame. 1061 */ 1062 1063 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 1064 struct ieee80211_mgmt *mgmt; 1065 1066 if (!ieee80211_is_mgmt(hdr->frame_control)) 1067 return RX_DROP_MONITOR; 1068 1069 if (ieee80211_is_action(hdr->frame_control)) { 1070 u8 category; 1071 1072 /* make sure category field is present */ 1073 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 1074 return RX_DROP_MONITOR; 1075 1076 mgmt = (struct ieee80211_mgmt *)hdr; 1077 category = mgmt->u.action.category; 1078 if (category != WLAN_CATEGORY_MESH_ACTION && 1079 category != WLAN_CATEGORY_SELF_PROTECTED) 1080 return RX_DROP_MONITOR; 1081 return RX_CONTINUE; 1082 } 1083 1084 if (ieee80211_is_probe_req(hdr->frame_control) || 1085 ieee80211_is_probe_resp(hdr->frame_control) || 1086 ieee80211_is_beacon(hdr->frame_control) || 1087 ieee80211_is_auth(hdr->frame_control)) 1088 return RX_CONTINUE; 1089 1090 return RX_DROP_MONITOR; 1091 } 1092 1093 return RX_CONTINUE; 1094 } 1095 1096 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, 1097 int index) 1098 { 1099 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index]; 1100 struct sk_buff *tail = skb_peek_tail(frames); 1101 struct ieee80211_rx_status *status; 1102 1103 if (tid_agg_rx->reorder_buf_filtered && 1104 tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) 1105 return true; 1106 1107 if (!tail) 1108 return false; 1109 1110 status = IEEE80211_SKB_RXCB(tail); 1111 if (status->flag & RX_FLAG_AMSDU_MORE) 1112 return false; 1113 1114 return true; 1115 } 1116 1117 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 1118 struct tid_ampdu_rx *tid_agg_rx, 1119 int index, 1120 struct sk_buff_head *frames) 1121 { 1122 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; 1123 struct sk_buff *skb; 1124 struct ieee80211_rx_status *status; 1125 1126 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1127 1128 if (skb_queue_empty(skb_list)) 1129 goto no_frame; 1130 1131 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1132 __skb_queue_purge(skb_list); 1133 goto no_frame; 1134 } 1135 1136 /* release frames from the reorder ring buffer */ 1137 tid_agg_rx->stored_mpdu_num--; 1138 while ((skb = __skb_dequeue(skb_list))) { 1139 status = IEEE80211_SKB_RXCB(skb); 1140 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 1141 __skb_queue_tail(frames, skb); 1142 } 1143 1144 no_frame: 1145 if (tid_agg_rx->reorder_buf_filtered) 1146 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 1147 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1148 } 1149 1150 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 1151 struct tid_ampdu_rx *tid_agg_rx, 1152 u16 head_seq_num, 1153 struct sk_buff_head *frames) 1154 { 1155 int index; 1156 1157 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1158 1159 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 1160 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1161 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1162 frames); 1163 } 1164 } 1165 1166 /* 1167 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 1168 * the skb was added to the buffer longer than this time ago, the earlier 1169 * frames that have not yet been received are assumed to be lost and the skb 1170 * can be released for processing. This may also release other skb's from the 1171 * reorder buffer if there are no additional gaps between the frames. 1172 * 1173 * Callers must hold tid_agg_rx->reorder_lock. 1174 */ 1175 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 1176 1177 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 1178 struct tid_ampdu_rx *tid_agg_rx, 1179 struct sk_buff_head *frames) 1180 { 1181 int index, i, j; 1182 1183 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1184 1185 /* release the buffer until next missing frame */ 1186 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1187 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && 1188 tid_agg_rx->stored_mpdu_num) { 1189 /* 1190 * No buffers ready to be released, but check whether any 1191 * frames in the reorder buffer have timed out. 1192 */ 1193 int skipped = 1; 1194 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 1195 j = (j + 1) % tid_agg_rx->buf_size) { 1196 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { 1197 skipped++; 1198 continue; 1199 } 1200 if (skipped && 1201 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 1202 HT_RX_REORDER_BUF_TIMEOUT)) 1203 goto set_release_timer; 1204 1205 /* don't leave incomplete A-MSDUs around */ 1206 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 1207 i = (i + 1) % tid_agg_rx->buf_size) 1208 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]); 1209 1210 ht_dbg_ratelimited(sdata, 1211 "release an RX reorder frame due to timeout on earlier frames\n"); 1212 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 1213 frames); 1214 1215 /* 1216 * Increment the head seq# also for the skipped slots. 1217 */ 1218 tid_agg_rx->head_seq_num = 1219 (tid_agg_rx->head_seq_num + 1220 skipped) & IEEE80211_SN_MASK; 1221 skipped = 0; 1222 } 1223 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1224 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1225 frames); 1226 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1227 } 1228 1229 if (tid_agg_rx->stored_mpdu_num) { 1230 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1231 1232 for (; j != (index - 1) % tid_agg_rx->buf_size; 1233 j = (j + 1) % tid_agg_rx->buf_size) { 1234 if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) 1235 break; 1236 } 1237 1238 set_release_timer: 1239 1240 if (!tid_agg_rx->removed) 1241 mod_timer(&tid_agg_rx->reorder_timer, 1242 tid_agg_rx->reorder_time[j] + 1 + 1243 HT_RX_REORDER_BUF_TIMEOUT); 1244 } else { 1245 del_timer(&tid_agg_rx->reorder_timer); 1246 } 1247 } 1248 1249 /* 1250 * As this function belongs to the RX path it must be under 1251 * rcu_read_lock protection. It returns false if the frame 1252 * can be processed immediately, true if it was consumed. 1253 */ 1254 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 1255 struct tid_ampdu_rx *tid_agg_rx, 1256 struct sk_buff *skb, 1257 struct sk_buff_head *frames) 1258 { 1259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1260 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1261 u16 mpdu_seq_num = ieee80211_get_sn(hdr); 1262 u16 head_seq_num, buf_size; 1263 int index; 1264 bool ret = true; 1265 1266 spin_lock(&tid_agg_rx->reorder_lock); 1267 1268 /* 1269 * Offloaded BA sessions have no known starting sequence number so pick 1270 * one from first Rxed frame for this tid after BA was started. 1271 */ 1272 if (unlikely(tid_agg_rx->auto_seq)) { 1273 tid_agg_rx->auto_seq = false; 1274 tid_agg_rx->ssn = mpdu_seq_num; 1275 tid_agg_rx->head_seq_num = mpdu_seq_num; 1276 } 1277 1278 buf_size = tid_agg_rx->buf_size; 1279 head_seq_num = tid_agg_rx->head_seq_num; 1280 1281 /* 1282 * If the current MPDU's SN is smaller than the SSN, it shouldn't 1283 * be reordered. 1284 */ 1285 if (unlikely(!tid_agg_rx->started)) { 1286 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1287 ret = false; 1288 goto out; 1289 } 1290 tid_agg_rx->started = true; 1291 } 1292 1293 /* frame with out of date sequence number */ 1294 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1295 dev_kfree_skb(skb); 1296 goto out; 1297 } 1298 1299 /* 1300 * If frame the sequence number exceeds our buffering window 1301 * size release some previous frames to make room for this one. 1302 */ 1303 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 1304 head_seq_num = ieee80211_sn_inc( 1305 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 1306 /* release stored frames up to new head to stack */ 1307 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 1308 head_seq_num, frames); 1309 } 1310 1311 /* Now the new frame is always in the range of the reordering buffer */ 1312 1313 index = mpdu_seq_num % tid_agg_rx->buf_size; 1314 1315 /* check if we already stored this frame */ 1316 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1317 dev_kfree_skb(skb); 1318 goto out; 1319 } 1320 1321 /* 1322 * If the current MPDU is in the right order and nothing else 1323 * is stored we can process it directly, no need to buffer it. 1324 * If it is first but there's something stored, we may be able 1325 * to release frames after this one. 1326 */ 1327 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1328 tid_agg_rx->stored_mpdu_num == 0) { 1329 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1330 tid_agg_rx->head_seq_num = 1331 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1332 ret = false; 1333 goto out; 1334 } 1335 1336 /* put the frame in the reordering buffer */ 1337 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); 1338 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1339 tid_agg_rx->reorder_time[index] = jiffies; 1340 tid_agg_rx->stored_mpdu_num++; 1341 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1342 } 1343 1344 out: 1345 spin_unlock(&tid_agg_rx->reorder_lock); 1346 return ret; 1347 } 1348 1349 /* 1350 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1351 * true if the MPDU was buffered, false if it should be processed. 1352 */ 1353 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1354 struct sk_buff_head *frames) 1355 { 1356 struct sk_buff *skb = rx->skb; 1357 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1358 struct sta_info *sta = rx->sta; 1359 struct tid_ampdu_rx *tid_agg_rx; 1360 u16 sc; 1361 u8 tid, ack_policy; 1362 1363 if (!ieee80211_is_data_qos(hdr->frame_control) || 1364 is_multicast_ether_addr(hdr->addr1)) 1365 goto dont_reorder; 1366 1367 /* 1368 * filter the QoS data rx stream according to 1369 * STA/TID and check if this STA/TID is on aggregation 1370 */ 1371 1372 if (!sta) 1373 goto dont_reorder; 1374 1375 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1376 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1377 tid = ieee80211_get_tid(hdr); 1378 1379 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1380 if (!tid_agg_rx) { 1381 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1382 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1383 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1384 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1385 WLAN_BACK_RECIPIENT, 1386 WLAN_REASON_QSTA_REQUIRE_SETUP); 1387 goto dont_reorder; 1388 } 1389 1390 /* qos null data frames are excluded */ 1391 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1392 goto dont_reorder; 1393 1394 /* not part of a BA session */ 1395 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 1396 goto dont_reorder; 1397 1398 /* new, potentially un-ordered, ampdu frame - process it */ 1399 1400 /* reset session timer */ 1401 if (tid_agg_rx->timeout) 1402 tid_agg_rx->last_rx = jiffies; 1403 1404 /* if this mpdu is fragmented - terminate rx aggregation session */ 1405 sc = le16_to_cpu(hdr->seq_ctrl); 1406 if (sc & IEEE80211_SCTL_FRAG) { 1407 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb); 1408 return; 1409 } 1410 1411 /* 1412 * No locking needed -- we will only ever process one 1413 * RX packet at a time, and thus own tid_agg_rx. All 1414 * other code manipulating it needs to (and does) make 1415 * sure that we cannot get to it any more before doing 1416 * anything with it. 1417 */ 1418 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1419 frames)) 1420 return; 1421 1422 dont_reorder: 1423 __skb_queue_tail(frames, skb); 1424 } 1425 1426 static ieee80211_rx_result debug_noinline 1427 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1428 { 1429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1430 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1431 1432 if (status->flag & RX_FLAG_DUP_VALIDATED) 1433 return RX_CONTINUE; 1434 1435 /* 1436 * Drop duplicate 802.11 retransmissions 1437 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1438 */ 1439 1440 if (rx->skb->len < 24) 1441 return RX_CONTINUE; 1442 1443 if (ieee80211_is_ctl(hdr->frame_control) || 1444 ieee80211_is_any_nullfunc(hdr->frame_control)) 1445 return RX_CONTINUE; 1446 1447 if (!rx->sta) 1448 return RX_CONTINUE; 1449 1450 if (unlikely(is_multicast_ether_addr(hdr->addr1))) { 1451 struct ieee80211_sub_if_data *sdata = rx->sdata; 1452 u16 sn = ieee80211_get_sn(hdr); 1453 1454 if (!ieee80211_is_data_present(hdr->frame_control)) 1455 return RX_CONTINUE; 1456 1457 if (!ieee80211_vif_is_mld(&sdata->vif) || 1458 sdata->vif.type != NL80211_IFTYPE_STATION) 1459 return RX_CONTINUE; 1460 1461 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO && 1462 ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last)) 1463 return RX_DROP_U_DUP; 1464 1465 sdata->u.mgd.mcast_seq_last = sn; 1466 return RX_CONTINUE; 1467 } 1468 1469 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1470 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1471 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1472 rx->link_sta->rx_stats.num_duplicates++; 1473 return RX_DROP_U_DUP; 1474 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1475 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1476 } 1477 1478 return RX_CONTINUE; 1479 } 1480 1481 static ieee80211_rx_result debug_noinline 1482 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1483 { 1484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1485 1486 /* Drop disallowed frame classes based on STA auth/assoc state; 1487 * IEEE 802.11, Chap 5.5. 1488 * 1489 * mac80211 filters only based on association state, i.e. it drops 1490 * Class 3 frames from not associated stations. hostapd sends 1491 * deauth/disassoc frames when needed. In addition, hostapd is 1492 * responsible for filtering on both auth and assoc states. 1493 */ 1494 1495 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1496 return ieee80211_rx_mesh_check(rx); 1497 1498 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1499 ieee80211_is_pspoll(hdr->frame_control)) && 1500 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1501 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1502 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1503 /* 1504 * accept port control frames from the AP even when it's not 1505 * yet marked ASSOC to prevent a race where we don't set the 1506 * assoc bit quickly enough before it sends the first frame 1507 */ 1508 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1509 ieee80211_is_data_present(hdr->frame_control)) { 1510 unsigned int hdrlen; 1511 __be16 ethertype; 1512 1513 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1514 1515 if (rx->skb->len < hdrlen + 8) 1516 return RX_DROP_MONITOR; 1517 1518 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1519 if (ethertype == rx->sdata->control_port_protocol) 1520 return RX_CONTINUE; 1521 } 1522 1523 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1524 cfg80211_rx_spurious_frame(rx->sdata->dev, 1525 hdr->addr2, 1526 GFP_ATOMIC)) 1527 return RX_DROP_U_SPURIOUS; 1528 1529 return RX_DROP_MONITOR; 1530 } 1531 1532 return RX_CONTINUE; 1533 } 1534 1535 1536 static ieee80211_rx_result debug_noinline 1537 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1538 { 1539 struct ieee80211_local *local; 1540 struct ieee80211_hdr *hdr; 1541 struct sk_buff *skb; 1542 1543 local = rx->local; 1544 skb = rx->skb; 1545 hdr = (struct ieee80211_hdr *) skb->data; 1546 1547 if (!local->pspolling) 1548 return RX_CONTINUE; 1549 1550 if (!ieee80211_has_fromds(hdr->frame_control)) 1551 /* this is not from AP */ 1552 return RX_CONTINUE; 1553 1554 if (!ieee80211_is_data(hdr->frame_control)) 1555 return RX_CONTINUE; 1556 1557 if (!ieee80211_has_moredata(hdr->frame_control)) { 1558 /* AP has no more frames buffered for us */ 1559 local->pspolling = false; 1560 return RX_CONTINUE; 1561 } 1562 1563 /* more data bit is set, let's request a new frame from the AP */ 1564 ieee80211_send_pspoll(local, rx->sdata); 1565 1566 return RX_CONTINUE; 1567 } 1568 1569 static void sta_ps_start(struct sta_info *sta) 1570 { 1571 struct ieee80211_sub_if_data *sdata = sta->sdata; 1572 struct ieee80211_local *local = sdata->local; 1573 struct ps_data *ps; 1574 int tid; 1575 1576 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1577 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1578 ps = &sdata->bss->ps; 1579 else 1580 return; 1581 1582 atomic_inc(&ps->num_sta_ps); 1583 set_sta_flag(sta, WLAN_STA_PS_STA); 1584 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1585 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1586 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1587 sta->sta.addr, sta->sta.aid); 1588 1589 ieee80211_clear_fast_xmit(sta); 1590 1591 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1592 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1593 struct txq_info *txqi = to_txq_info(txq); 1594 1595 spin_lock(&local->active_txq_lock[txq->ac]); 1596 if (!list_empty(&txqi->schedule_order)) 1597 list_del_init(&txqi->schedule_order); 1598 spin_unlock(&local->active_txq_lock[txq->ac]); 1599 1600 if (txq_has_queue(txq)) 1601 set_bit(tid, &sta->txq_buffered_tids); 1602 else 1603 clear_bit(tid, &sta->txq_buffered_tids); 1604 } 1605 } 1606 1607 static void sta_ps_end(struct sta_info *sta) 1608 { 1609 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1610 sta->sta.addr, sta->sta.aid); 1611 1612 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1613 /* 1614 * Clear the flag only if the other one is still set 1615 * so that the TX path won't start TX'ing new frames 1616 * directly ... In the case that the driver flag isn't 1617 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1618 */ 1619 clear_sta_flag(sta, WLAN_STA_PS_STA); 1620 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1621 sta->sta.addr, sta->sta.aid); 1622 return; 1623 } 1624 1625 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1626 clear_sta_flag(sta, WLAN_STA_PS_STA); 1627 ieee80211_sta_ps_deliver_wakeup(sta); 1628 } 1629 1630 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1631 { 1632 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1633 bool in_ps; 1634 1635 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1636 1637 /* Don't let the same PS state be set twice */ 1638 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1639 if ((start && in_ps) || (!start && !in_ps)) 1640 return -EINVAL; 1641 1642 if (start) 1643 sta_ps_start(sta); 1644 else 1645 sta_ps_end(sta); 1646 1647 return 0; 1648 } 1649 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1650 1651 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1652 { 1653 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1654 1655 if (test_sta_flag(sta, WLAN_STA_SP)) 1656 return; 1657 1658 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1659 ieee80211_sta_ps_deliver_poll_response(sta); 1660 else 1661 set_sta_flag(sta, WLAN_STA_PSPOLL); 1662 } 1663 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1664 1665 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1666 { 1667 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1668 int ac = ieee80211_ac_from_tid(tid); 1669 1670 /* 1671 * If this AC is not trigger-enabled do nothing unless the 1672 * driver is calling us after it already checked. 1673 * 1674 * NB: This could/should check a separate bitmap of trigger- 1675 * enabled queues, but for now we only implement uAPSD w/o 1676 * TSPEC changes to the ACs, so they're always the same. 1677 */ 1678 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1679 tid != IEEE80211_NUM_TIDS) 1680 return; 1681 1682 /* if we are in a service period, do nothing */ 1683 if (test_sta_flag(sta, WLAN_STA_SP)) 1684 return; 1685 1686 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1687 ieee80211_sta_ps_deliver_uapsd(sta); 1688 else 1689 set_sta_flag(sta, WLAN_STA_UAPSD); 1690 } 1691 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1692 1693 static ieee80211_rx_result debug_noinline 1694 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1695 { 1696 struct ieee80211_sub_if_data *sdata = rx->sdata; 1697 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1698 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1699 1700 if (!rx->sta) 1701 return RX_CONTINUE; 1702 1703 if (sdata->vif.type != NL80211_IFTYPE_AP && 1704 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1705 return RX_CONTINUE; 1706 1707 /* 1708 * The device handles station powersave, so don't do anything about 1709 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1710 * it to mac80211 since they're handled.) 1711 */ 1712 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1713 return RX_CONTINUE; 1714 1715 /* 1716 * Don't do anything if the station isn't already asleep. In 1717 * the uAPSD case, the station will probably be marked asleep, 1718 * in the PS-Poll case the station must be confused ... 1719 */ 1720 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1721 return RX_CONTINUE; 1722 1723 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1724 ieee80211_sta_pspoll(&rx->sta->sta); 1725 1726 /* Free PS Poll skb here instead of returning RX_DROP that would 1727 * count as an dropped frame. */ 1728 dev_kfree_skb(rx->skb); 1729 1730 return RX_QUEUED; 1731 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1732 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1733 ieee80211_has_pm(hdr->frame_control) && 1734 (ieee80211_is_data_qos(hdr->frame_control) || 1735 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1736 u8 tid = ieee80211_get_tid(hdr); 1737 1738 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1739 } 1740 1741 return RX_CONTINUE; 1742 } 1743 1744 static ieee80211_rx_result debug_noinline 1745 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1746 { 1747 struct sta_info *sta = rx->sta; 1748 struct link_sta_info *link_sta = rx->link_sta; 1749 struct sk_buff *skb = rx->skb; 1750 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1751 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1752 int i; 1753 1754 if (!sta || !link_sta) 1755 return RX_CONTINUE; 1756 1757 /* 1758 * Update last_rx only for IBSS packets which are for the current 1759 * BSSID and for station already AUTHORIZED to avoid keeping the 1760 * current IBSS network alive in cases where other STAs start 1761 * using different BSSID. This will also give the station another 1762 * chance to restart the authentication/authorization in case 1763 * something went wrong the first time. 1764 */ 1765 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1766 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1767 NL80211_IFTYPE_ADHOC); 1768 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1769 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1770 link_sta->rx_stats.last_rx = jiffies; 1771 if (ieee80211_is_data_present(hdr->frame_control) && 1772 !is_multicast_ether_addr(hdr->addr1)) 1773 link_sta->rx_stats.last_rate = 1774 sta_stats_encode_rate(status); 1775 } 1776 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1777 link_sta->rx_stats.last_rx = jiffies; 1778 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1779 !is_multicast_ether_addr(hdr->addr1)) { 1780 /* 1781 * Mesh beacons will update last_rx when if they are found to 1782 * match the current local configuration when processed. 1783 */ 1784 link_sta->rx_stats.last_rx = jiffies; 1785 if (ieee80211_is_data_present(hdr->frame_control)) 1786 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1787 } 1788 1789 link_sta->rx_stats.fragments++; 1790 1791 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1792 link_sta->rx_stats.bytes += rx->skb->len; 1793 u64_stats_update_end(&link_sta->rx_stats.syncp); 1794 1795 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1796 link_sta->rx_stats.last_signal = status->signal; 1797 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1798 -status->signal); 1799 } 1800 1801 if (status->chains) { 1802 link_sta->rx_stats.chains = status->chains; 1803 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1804 int signal = status->chain_signal[i]; 1805 1806 if (!(status->chains & BIT(i))) 1807 continue; 1808 1809 link_sta->rx_stats.chain_signal_last[i] = signal; 1810 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1811 -signal); 1812 } 1813 } 1814 1815 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1816 return RX_CONTINUE; 1817 1818 /* 1819 * Change STA power saving mode only at the end of a frame 1820 * exchange sequence, and only for a data or management 1821 * frame as specified in IEEE 802.11-2016 11.2.3.2 1822 */ 1823 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1824 !ieee80211_has_morefrags(hdr->frame_control) && 1825 !is_multicast_ether_addr(hdr->addr1) && 1826 (ieee80211_is_mgmt(hdr->frame_control) || 1827 ieee80211_is_data(hdr->frame_control)) && 1828 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1829 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1830 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1831 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1832 if (!ieee80211_has_pm(hdr->frame_control)) 1833 sta_ps_end(sta); 1834 } else { 1835 if (ieee80211_has_pm(hdr->frame_control)) 1836 sta_ps_start(sta); 1837 } 1838 } 1839 1840 /* mesh power save support */ 1841 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1842 ieee80211_mps_rx_h_sta_process(sta, hdr); 1843 1844 /* 1845 * Drop (qos-)data::nullfunc frames silently, since they 1846 * are used only to control station power saving mode. 1847 */ 1848 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1849 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1850 1851 /* 1852 * If we receive a 4-addr nullfunc frame from a STA 1853 * that was not moved to a 4-addr STA vlan yet send 1854 * the event to userspace and for older hostapd drop 1855 * the frame to the monitor interface. 1856 */ 1857 if (ieee80211_has_a4(hdr->frame_control) && 1858 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1859 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1860 !rx->sdata->u.vlan.sta))) { 1861 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1862 cfg80211_rx_unexpected_4addr_frame( 1863 rx->sdata->dev, sta->sta.addr, 1864 GFP_ATOMIC); 1865 return RX_DROP_M_UNEXPECTED_4ADDR_FRAME; 1866 } 1867 /* 1868 * Update counter and free packet here to avoid 1869 * counting this as a dropped packed. 1870 */ 1871 link_sta->rx_stats.packets++; 1872 dev_kfree_skb(rx->skb); 1873 return RX_QUEUED; 1874 } 1875 1876 return RX_CONTINUE; 1877 } /* ieee80211_rx_h_sta_process */ 1878 1879 static struct ieee80211_key * 1880 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1881 { 1882 struct ieee80211_key *key = NULL; 1883 int idx2; 1884 1885 /* Make sure key gets set if either BIGTK key index is set so that 1886 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1887 * Beacon frames and Beacon frames that claim to use another BIGTK key 1888 * index (i.e., a key that we do not have). 1889 */ 1890 1891 if (idx < 0) { 1892 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 1893 idx2 = idx + 1; 1894 } else { 1895 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1896 idx2 = idx + 1; 1897 else 1898 idx2 = idx - 1; 1899 } 1900 1901 if (rx->link_sta) 1902 key = rcu_dereference(rx->link_sta->gtk[idx]); 1903 if (!key) 1904 key = rcu_dereference(rx->link->gtk[idx]); 1905 if (!key && rx->link_sta) 1906 key = rcu_dereference(rx->link_sta->gtk[idx2]); 1907 if (!key) 1908 key = rcu_dereference(rx->link->gtk[idx2]); 1909 1910 return key; 1911 } 1912 1913 static ieee80211_rx_result debug_noinline 1914 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1915 { 1916 struct sk_buff *skb = rx->skb; 1917 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1918 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1919 int keyidx; 1920 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 1921 struct ieee80211_key *sta_ptk = NULL; 1922 struct ieee80211_key *ptk_idx = NULL; 1923 int mmie_keyidx = -1; 1924 __le16 fc; 1925 1926 if (ieee80211_is_ext(hdr->frame_control)) 1927 return RX_CONTINUE; 1928 1929 /* 1930 * Key selection 101 1931 * 1932 * There are five types of keys: 1933 * - GTK (group keys) 1934 * - IGTK (group keys for management frames) 1935 * - BIGTK (group keys for Beacon frames) 1936 * - PTK (pairwise keys) 1937 * - STK (station-to-station pairwise keys) 1938 * 1939 * When selecting a key, we have to distinguish between multicast 1940 * (including broadcast) and unicast frames, the latter can only 1941 * use PTKs and STKs while the former always use GTKs, IGTKs, and 1942 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 1943 * then unicast frames can also use key indices like GTKs. Hence, if we 1944 * don't have a PTK/STK we check the key index for a WEP key. 1945 * 1946 * Note that in a regular BSS, multicast frames are sent by the 1947 * AP only, associated stations unicast the frame to the AP first 1948 * which then multicasts it on their behalf. 1949 * 1950 * There is also a slight problem in IBSS mode: GTKs are negotiated 1951 * with each station, that is something we don't currently handle. 1952 * The spec seems to expect that one negotiates the same key with 1953 * every station but there's no such requirement; VLANs could be 1954 * possible. 1955 */ 1956 1957 /* start without a key */ 1958 rx->key = NULL; 1959 fc = hdr->frame_control; 1960 1961 if (rx->sta) { 1962 int keyid = rx->sta->ptk_idx; 1963 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1964 1965 if (ieee80211_has_protected(fc) && 1966 !(status->flag & RX_FLAG_IV_STRIPPED)) { 1967 keyid = ieee80211_get_keyid(rx->skb); 1968 1969 if (unlikely(keyid < 0)) 1970 return RX_DROP_U_NO_KEY_ID; 1971 1972 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 1973 } 1974 } 1975 1976 if (!ieee80211_has_protected(fc)) 1977 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1978 1979 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1980 rx->key = ptk_idx ? ptk_idx : sta_ptk; 1981 if ((status->flag & RX_FLAG_DECRYPTED) && 1982 (status->flag & RX_FLAG_IV_STRIPPED)) 1983 return RX_CONTINUE; 1984 /* Skip decryption if the frame is not protected. */ 1985 if (!ieee80211_has_protected(fc)) 1986 return RX_CONTINUE; 1987 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 1988 /* Broadcast/multicast robust management frame / BIP */ 1989 if ((status->flag & RX_FLAG_DECRYPTED) && 1990 (status->flag & RX_FLAG_IV_STRIPPED)) 1991 return RX_CONTINUE; 1992 1993 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 1994 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 1995 NUM_DEFAULT_BEACON_KEYS) { 1996 if (rx->sdata->dev) 1997 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1998 skb->data, 1999 skb->len); 2000 return RX_DROP_M_BAD_BCN_KEYIDX; 2001 } 2002 2003 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2004 if (!rx->key) 2005 return RX_CONTINUE; /* Beacon protection not in use */ 2006 } else if (mmie_keyidx >= 0) { 2007 /* Broadcast/multicast robust management frame / BIP */ 2008 if ((status->flag & RX_FLAG_DECRYPTED) && 2009 (status->flag & RX_FLAG_IV_STRIPPED)) 2010 return RX_CONTINUE; 2011 2012 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2013 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2014 return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2015 if (rx->link_sta) { 2016 if (ieee80211_is_group_privacy_action(skb) && 2017 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2018 return RX_DROP_MONITOR; 2019 2020 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2021 } 2022 if (!rx->key) 2023 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2024 } else if (!ieee80211_has_protected(fc)) { 2025 /* 2026 * The frame was not protected, so skip decryption. However, we 2027 * need to set rx->key if there is a key that could have been 2028 * used so that the frame may be dropped if encryption would 2029 * have been expected. 2030 */ 2031 struct ieee80211_key *key = NULL; 2032 int i; 2033 2034 if (ieee80211_is_beacon(fc)) { 2035 key = ieee80211_rx_get_bigtk(rx, -1); 2036 } else if (ieee80211_is_mgmt(fc) && 2037 is_multicast_ether_addr(hdr->addr1)) { 2038 key = rcu_dereference(rx->link->default_mgmt_key); 2039 } else { 2040 if (rx->link_sta) { 2041 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2042 key = rcu_dereference(rx->link_sta->gtk[i]); 2043 if (key) 2044 break; 2045 } 2046 } 2047 if (!key) { 2048 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2049 key = rcu_dereference(rx->link->gtk[i]); 2050 if (key) 2051 break; 2052 } 2053 } 2054 } 2055 if (key) 2056 rx->key = key; 2057 return RX_CONTINUE; 2058 } else { 2059 /* 2060 * The device doesn't give us the IV so we won't be 2061 * able to look up the key. That's ok though, we 2062 * don't need to decrypt the frame, we just won't 2063 * be able to keep statistics accurate. 2064 * Except for key threshold notifications, should 2065 * we somehow allow the driver to tell us which key 2066 * the hardware used if this flag is set? 2067 */ 2068 if ((status->flag & RX_FLAG_DECRYPTED) && 2069 (status->flag & RX_FLAG_IV_STRIPPED)) 2070 return RX_CONTINUE; 2071 2072 keyidx = ieee80211_get_keyid(rx->skb); 2073 2074 if (unlikely(keyidx < 0)) 2075 return RX_DROP_U_NO_KEY_ID; 2076 2077 /* check per-station GTK first, if multicast packet */ 2078 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2079 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2080 2081 /* if not found, try default key */ 2082 if (!rx->key) { 2083 if (is_multicast_ether_addr(hdr->addr1)) 2084 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2085 if (!rx->key) 2086 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2087 2088 /* 2089 * RSNA-protected unicast frames should always be 2090 * sent with pairwise or station-to-station keys, 2091 * but for WEP we allow using a key index as well. 2092 */ 2093 if (rx->key && 2094 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2095 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2096 !is_multicast_ether_addr(hdr->addr1)) 2097 rx->key = NULL; 2098 } 2099 } 2100 2101 if (rx->key) { 2102 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2103 return RX_DROP_MONITOR; 2104 2105 /* TODO: add threshold stuff again */ 2106 } else { 2107 return RX_DROP_MONITOR; 2108 } 2109 2110 switch (rx->key->conf.cipher) { 2111 case WLAN_CIPHER_SUITE_WEP40: 2112 case WLAN_CIPHER_SUITE_WEP104: 2113 result = ieee80211_crypto_wep_decrypt(rx); 2114 break; 2115 case WLAN_CIPHER_SUITE_TKIP: 2116 result = ieee80211_crypto_tkip_decrypt(rx); 2117 break; 2118 case WLAN_CIPHER_SUITE_CCMP: 2119 result = ieee80211_crypto_ccmp_decrypt( 2120 rx, IEEE80211_CCMP_MIC_LEN); 2121 break; 2122 case WLAN_CIPHER_SUITE_CCMP_256: 2123 result = ieee80211_crypto_ccmp_decrypt( 2124 rx, IEEE80211_CCMP_256_MIC_LEN); 2125 break; 2126 case WLAN_CIPHER_SUITE_AES_CMAC: 2127 result = ieee80211_crypto_aes_cmac_decrypt(rx); 2128 break; 2129 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2130 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 2131 break; 2132 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2133 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2134 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2135 break; 2136 case WLAN_CIPHER_SUITE_GCMP: 2137 case WLAN_CIPHER_SUITE_GCMP_256: 2138 result = ieee80211_crypto_gcmp_decrypt(rx); 2139 break; 2140 default: 2141 result = RX_DROP_U_BAD_CIPHER; 2142 } 2143 2144 /* the hdr variable is invalid after the decrypt handlers */ 2145 2146 /* either the frame has been decrypted or will be dropped */ 2147 status->flag |= RX_FLAG_DECRYPTED; 2148 2149 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2150 rx->sdata->dev)) 2151 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2152 skb->data, skb->len); 2153 2154 return result; 2155 } 2156 2157 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2158 { 2159 int i; 2160 2161 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2162 skb_queue_head_init(&cache->entries[i].skb_list); 2163 } 2164 2165 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2166 { 2167 int i; 2168 2169 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2170 __skb_queue_purge(&cache->entries[i].skb_list); 2171 } 2172 2173 static inline struct ieee80211_fragment_entry * 2174 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2175 unsigned int frag, unsigned int seq, int rx_queue, 2176 struct sk_buff **skb) 2177 { 2178 struct ieee80211_fragment_entry *entry; 2179 2180 entry = &cache->entries[cache->next++]; 2181 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2182 cache->next = 0; 2183 2184 __skb_queue_purge(&entry->skb_list); 2185 2186 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2187 *skb = NULL; 2188 entry->first_frag_time = jiffies; 2189 entry->seq = seq; 2190 entry->rx_queue = rx_queue; 2191 entry->last_frag = frag; 2192 entry->check_sequential_pn = false; 2193 entry->extra_len = 0; 2194 2195 return entry; 2196 } 2197 2198 static inline struct ieee80211_fragment_entry * 2199 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2200 unsigned int frag, unsigned int seq, 2201 int rx_queue, struct ieee80211_hdr *hdr) 2202 { 2203 struct ieee80211_fragment_entry *entry; 2204 int i, idx; 2205 2206 idx = cache->next; 2207 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2208 struct ieee80211_hdr *f_hdr; 2209 struct sk_buff *f_skb; 2210 2211 idx--; 2212 if (idx < 0) 2213 idx = IEEE80211_FRAGMENT_MAX - 1; 2214 2215 entry = &cache->entries[idx]; 2216 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2217 entry->rx_queue != rx_queue || 2218 entry->last_frag + 1 != frag) 2219 continue; 2220 2221 f_skb = __skb_peek(&entry->skb_list); 2222 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2223 2224 /* 2225 * Check ftype and addresses are equal, else check next fragment 2226 */ 2227 if (((hdr->frame_control ^ f_hdr->frame_control) & 2228 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2229 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2230 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2231 continue; 2232 2233 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2234 __skb_queue_purge(&entry->skb_list); 2235 continue; 2236 } 2237 return entry; 2238 } 2239 2240 return NULL; 2241 } 2242 2243 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2244 { 2245 return rx->key && 2246 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2247 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2248 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2249 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2250 ieee80211_has_protected(fc); 2251 } 2252 2253 static ieee80211_rx_result debug_noinline 2254 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2255 { 2256 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2257 struct ieee80211_hdr *hdr; 2258 u16 sc; 2259 __le16 fc; 2260 unsigned int frag, seq; 2261 struct ieee80211_fragment_entry *entry; 2262 struct sk_buff *skb; 2263 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2264 2265 hdr = (struct ieee80211_hdr *)rx->skb->data; 2266 fc = hdr->frame_control; 2267 2268 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2269 return RX_CONTINUE; 2270 2271 sc = le16_to_cpu(hdr->seq_ctrl); 2272 frag = sc & IEEE80211_SCTL_FRAG; 2273 2274 if (rx->sta) 2275 cache = &rx->sta->frags; 2276 2277 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2278 goto out; 2279 2280 if (is_multicast_ether_addr(hdr->addr1)) 2281 return RX_DROP_MONITOR; 2282 2283 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2284 2285 if (skb_linearize(rx->skb)) 2286 return RX_DROP_U_OOM; 2287 2288 /* 2289 * skb_linearize() might change the skb->data and 2290 * previously cached variables (in this case, hdr) need to 2291 * be refreshed with the new data. 2292 */ 2293 hdr = (struct ieee80211_hdr *)rx->skb->data; 2294 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2295 2296 if (frag == 0) { 2297 /* This is the first fragment of a new frame. */ 2298 entry = ieee80211_reassemble_add(cache, frag, seq, 2299 rx->seqno_idx, &(rx->skb)); 2300 if (requires_sequential_pn(rx, fc)) { 2301 int queue = rx->security_idx; 2302 2303 /* Store CCMP/GCMP PN so that we can verify that the 2304 * next fragment has a sequential PN value. 2305 */ 2306 entry->check_sequential_pn = true; 2307 entry->is_protected = true; 2308 entry->key_color = rx->key->color; 2309 memcpy(entry->last_pn, 2310 rx->key->u.ccmp.rx_pn[queue], 2311 IEEE80211_CCMP_PN_LEN); 2312 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2313 u.ccmp.rx_pn) != 2314 offsetof(struct ieee80211_key, 2315 u.gcmp.rx_pn)); 2316 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2317 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2318 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2319 IEEE80211_GCMP_PN_LEN); 2320 } else if (rx->key && 2321 (ieee80211_has_protected(fc) || 2322 (status->flag & RX_FLAG_DECRYPTED))) { 2323 entry->is_protected = true; 2324 entry->key_color = rx->key->color; 2325 } 2326 return RX_QUEUED; 2327 } 2328 2329 /* This is a fragment for a frame that should already be pending in 2330 * fragment cache. Add this fragment to the end of the pending entry. 2331 */ 2332 entry = ieee80211_reassemble_find(cache, frag, seq, 2333 rx->seqno_idx, hdr); 2334 if (!entry) { 2335 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2336 return RX_DROP_MONITOR; 2337 } 2338 2339 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2340 * MPDU PN values are not incrementing in steps of 1." 2341 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2342 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2343 */ 2344 if (entry->check_sequential_pn) { 2345 int i; 2346 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2347 2348 if (!requires_sequential_pn(rx, fc)) 2349 return RX_DROP_U_NONSEQ_PN; 2350 2351 /* Prevent mixed key and fragment cache attacks */ 2352 if (entry->key_color != rx->key->color) 2353 return RX_DROP_U_BAD_KEY_COLOR; 2354 2355 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2356 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2357 pn[i]++; 2358 if (pn[i]) 2359 break; 2360 } 2361 2362 rpn = rx->ccm_gcm.pn; 2363 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2364 return RX_DROP_U_REPLAY; 2365 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2366 } else if (entry->is_protected && 2367 (!rx->key || 2368 (!ieee80211_has_protected(fc) && 2369 !(status->flag & RX_FLAG_DECRYPTED)) || 2370 rx->key->color != entry->key_color)) { 2371 /* Drop this as a mixed key or fragment cache attack, even 2372 * if for TKIP Michael MIC should protect us, and WEP is a 2373 * lost cause anyway. 2374 */ 2375 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2376 } else if (entry->is_protected && rx->key && 2377 entry->key_color != rx->key->color && 2378 (status->flag & RX_FLAG_DECRYPTED)) { 2379 return RX_DROP_U_BAD_KEY_COLOR; 2380 } 2381 2382 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2383 __skb_queue_tail(&entry->skb_list, rx->skb); 2384 entry->last_frag = frag; 2385 entry->extra_len += rx->skb->len; 2386 if (ieee80211_has_morefrags(fc)) { 2387 rx->skb = NULL; 2388 return RX_QUEUED; 2389 } 2390 2391 rx->skb = __skb_dequeue(&entry->skb_list); 2392 if (skb_tailroom(rx->skb) < entry->extra_len) { 2393 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2394 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2395 GFP_ATOMIC))) { 2396 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2397 __skb_queue_purge(&entry->skb_list); 2398 return RX_DROP_U_OOM; 2399 } 2400 } 2401 while ((skb = __skb_dequeue(&entry->skb_list))) { 2402 skb_put_data(rx->skb, skb->data, skb->len); 2403 dev_kfree_skb(skb); 2404 } 2405 2406 out: 2407 ieee80211_led_rx(rx->local); 2408 if (rx->sta) 2409 rx->link_sta->rx_stats.packets++; 2410 return RX_CONTINUE; 2411 } 2412 2413 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2414 { 2415 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2416 return -EACCES; 2417 2418 return 0; 2419 } 2420 2421 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2422 { 2423 struct sk_buff *skb = rx->skb; 2424 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2425 2426 /* 2427 * Pass through unencrypted frames if the hardware has 2428 * decrypted them already. 2429 */ 2430 if (status->flag & RX_FLAG_DECRYPTED) 2431 return 0; 2432 2433 /* Drop unencrypted frames if key is set. */ 2434 if (unlikely(!ieee80211_has_protected(fc) && 2435 !ieee80211_is_any_nullfunc(fc) && 2436 ieee80211_is_data(fc) && rx->key)) 2437 return -EACCES; 2438 2439 return 0; 2440 } 2441 2442 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2443 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2444 { 2445 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2446 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2447 __le16 fc = mgmt->frame_control; 2448 2449 /* 2450 * Pass through unencrypted frames if the hardware has 2451 * decrypted them already. 2452 */ 2453 if (status->flag & RX_FLAG_DECRYPTED) 2454 return RX_CONTINUE; 2455 2456 /* drop unicast protected dual (that wasn't protected) */ 2457 if (ieee80211_is_action(fc) && 2458 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2459 return RX_DROP_U_UNPROT_DUAL; 2460 2461 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2462 if (unlikely(!ieee80211_has_protected(fc) && 2463 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2464 if (ieee80211_is_deauth(fc) || 2465 ieee80211_is_disassoc(fc)) { 2466 /* 2467 * Permit unprotected deauth/disassoc frames 2468 * during 4-way-HS (key is installed after HS). 2469 */ 2470 if (!rx->key) 2471 return RX_CONTINUE; 2472 2473 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2474 rx->skb->data, 2475 rx->skb->len); 2476 } 2477 return RX_DROP_U_UNPROT_UCAST_MGMT; 2478 } 2479 /* BIP does not use Protected field, so need to check MMIE */ 2480 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2481 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2482 if (ieee80211_is_deauth(fc) || 2483 ieee80211_is_disassoc(fc)) 2484 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2485 rx->skb->data, 2486 rx->skb->len); 2487 return RX_DROP_U_UNPROT_MCAST_MGMT; 2488 } 2489 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2490 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2491 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2492 rx->skb->data, 2493 rx->skb->len); 2494 return RX_DROP_U_UNPROT_BEACON; 2495 } 2496 /* 2497 * When using MFP, Action frames are not allowed prior to 2498 * having configured keys. 2499 */ 2500 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2501 ieee80211_is_robust_mgmt_frame(rx->skb))) 2502 return RX_DROP_U_UNPROT_ACTION; 2503 2504 /* drop unicast public action frames when using MPF */ 2505 if (is_unicast_ether_addr(mgmt->da) && 2506 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2507 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2508 } 2509 2510 /* 2511 * Drop robust action frames before assoc regardless of MFP state, 2512 * after assoc we also have decided on MFP or not. 2513 */ 2514 if (ieee80211_is_action(fc) && 2515 ieee80211_is_robust_mgmt_frame(rx->skb) && 2516 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2517 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2518 2519 return RX_CONTINUE; 2520 } 2521 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2522 2523 static ieee80211_rx_result 2524 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2525 { 2526 struct ieee80211_sub_if_data *sdata = rx->sdata; 2527 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2528 bool check_port_control = false; 2529 struct ethhdr *ehdr; 2530 int ret; 2531 2532 *port_control = false; 2533 if (ieee80211_has_a4(hdr->frame_control) && 2534 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2535 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2536 2537 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2538 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2539 if (!sdata->u.mgd.use_4addr) 2540 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2541 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2542 check_port_control = true; 2543 } 2544 2545 if (is_multicast_ether_addr(hdr->addr1) && 2546 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2547 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2548 2549 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2550 if (ret < 0) 2551 return RX_DROP_U_INVALID_8023; 2552 2553 ehdr = (struct ethhdr *) rx->skb->data; 2554 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2555 *port_control = true; 2556 else if (check_port_control) 2557 return RX_DROP_U_NOT_PORT_CONTROL; 2558 2559 return RX_CONTINUE; 2560 } 2561 2562 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2563 const u8 *addr, int *out_link_id) 2564 { 2565 unsigned int link_id; 2566 2567 /* non-MLO, or MLD address replaced by hardware */ 2568 if (ether_addr_equal(sdata->vif.addr, addr)) 2569 return true; 2570 2571 if (!ieee80211_vif_is_mld(&sdata->vif)) 2572 return false; 2573 2574 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2575 struct ieee80211_bss_conf *conf; 2576 2577 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2578 2579 if (!conf) 2580 continue; 2581 if (ether_addr_equal(conf->addr, addr)) { 2582 if (out_link_id) 2583 *out_link_id = link_id; 2584 return true; 2585 } 2586 } 2587 2588 return false; 2589 } 2590 2591 /* 2592 * requires that rx->skb is a frame with ethernet header 2593 */ 2594 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2595 { 2596 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2597 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2598 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2599 2600 /* 2601 * Allow EAPOL frames to us/the PAE group address regardless of 2602 * whether the frame was encrypted or not, and always disallow 2603 * all other destination addresses for them. 2604 */ 2605 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2606 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2607 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2608 2609 if (ieee80211_802_1x_port_control(rx) || 2610 ieee80211_drop_unencrypted(rx, fc)) 2611 return false; 2612 2613 return true; 2614 } 2615 2616 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2617 struct ieee80211_rx_data *rx) 2618 { 2619 struct ieee80211_sub_if_data *sdata = rx->sdata; 2620 struct net_device *dev = sdata->dev; 2621 2622 if (unlikely((skb->protocol == sdata->control_port_protocol || 2623 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2624 !sdata->control_port_no_preauth)) && 2625 sdata->control_port_over_nl80211)) { 2626 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2627 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2628 2629 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2630 dev_kfree_skb(skb); 2631 } else { 2632 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2633 2634 memset(skb->cb, 0, sizeof(skb->cb)); 2635 2636 /* 2637 * 802.1X over 802.11 requires that the authenticator address 2638 * be used for EAPOL frames. However, 802.1X allows the use of 2639 * the PAE group address instead. If the interface is part of 2640 * a bridge and we pass the frame with the PAE group address, 2641 * then the bridge will forward it to the network (even if the 2642 * client was not associated yet), which isn't supposed to 2643 * happen. 2644 * To avoid that, rewrite the destination address to our own 2645 * address, so that the authenticator (e.g. hostapd) will see 2646 * the frame, but bridge won't forward it anywhere else. Note 2647 * that due to earlier filtering, the only other address can 2648 * be the PAE group address, unless the hardware allowed them 2649 * through in 802.3 offloaded mode. 2650 */ 2651 if (unlikely(skb->protocol == sdata->control_port_protocol && 2652 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2653 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2654 2655 /* deliver to local stack */ 2656 if (rx->list) 2657 list_add_tail(&skb->list, rx->list); 2658 else 2659 netif_receive_skb(skb); 2660 } 2661 } 2662 2663 /* 2664 * requires that rx->skb is a frame with ethernet header 2665 */ 2666 static void 2667 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2668 { 2669 struct ieee80211_sub_if_data *sdata = rx->sdata; 2670 struct net_device *dev = sdata->dev; 2671 struct sk_buff *skb, *xmit_skb; 2672 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2673 struct sta_info *dsta; 2674 2675 skb = rx->skb; 2676 xmit_skb = NULL; 2677 2678 dev_sw_netstats_rx_add(dev, skb->len); 2679 2680 if (rx->sta) { 2681 /* The seqno index has the same property as needed 2682 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2683 * for non-QoS-data frames. Here we know it's a data 2684 * frame, so count MSDUs. 2685 */ 2686 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2687 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++; 2688 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2689 } 2690 2691 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2693 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2694 ehdr->h_proto != rx->sdata->control_port_protocol && 2695 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2696 if (is_multicast_ether_addr(ehdr->h_dest) && 2697 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2698 /* 2699 * send multicast frames both to higher layers in 2700 * local net stack and back to the wireless medium 2701 */ 2702 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2703 if (!xmit_skb) 2704 net_info_ratelimited("%s: failed to clone multicast frame\n", 2705 dev->name); 2706 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2707 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2708 dsta = sta_info_get(sdata, ehdr->h_dest); 2709 if (dsta) { 2710 /* 2711 * The destination station is associated to 2712 * this AP (in this VLAN), so send the frame 2713 * directly to it and do not pass it to local 2714 * net stack. 2715 */ 2716 xmit_skb = skb; 2717 skb = NULL; 2718 } 2719 } 2720 } 2721 2722 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2723 if (skb) { 2724 /* 'align' will only take the values 0 or 2 here since all 2725 * frames are required to be aligned to 2-byte boundaries 2726 * when being passed to mac80211; the code here works just 2727 * as well if that isn't true, but mac80211 assumes it can 2728 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2729 */ 2730 int align; 2731 2732 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2733 if (align) { 2734 if (WARN_ON(skb_headroom(skb) < 3)) { 2735 dev_kfree_skb(skb); 2736 skb = NULL; 2737 } else { 2738 u8 *data = skb->data; 2739 size_t len = skb_headlen(skb); 2740 skb->data -= align; 2741 memmove(skb->data, data, len); 2742 skb_set_tail_pointer(skb, len); 2743 } 2744 } 2745 } 2746 #endif 2747 2748 if (skb) { 2749 skb->protocol = eth_type_trans(skb, dev); 2750 ieee80211_deliver_skb_to_local_stack(skb, rx); 2751 } 2752 2753 if (xmit_skb) { 2754 /* 2755 * Send to wireless media and increase priority by 256 to 2756 * keep the received priority instead of reclassifying 2757 * the frame (see cfg80211_classify8021d). 2758 */ 2759 xmit_skb->priority += 256; 2760 xmit_skb->protocol = htons(ETH_P_802_3); 2761 skb_reset_network_header(xmit_skb); 2762 skb_reset_mac_header(xmit_skb); 2763 dev_queue_xmit(xmit_skb); 2764 } 2765 } 2766 2767 #ifdef CONFIG_MAC80211_MESH 2768 static bool 2769 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2770 struct sk_buff *skb, int hdrlen) 2771 { 2772 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2773 struct ieee80211_mesh_fast_tx_key key = { 2774 .type = MESH_FAST_TX_TYPE_FORWARDED 2775 }; 2776 struct ieee80211_mesh_fast_tx *entry; 2777 struct ieee80211s_hdr *mesh_hdr; 2778 struct tid_ampdu_tx *tid_tx; 2779 struct sta_info *sta; 2780 struct ethhdr eth; 2781 u8 tid; 2782 2783 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2784 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2785 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2786 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2787 ether_addr_copy(key.addr, skb->data); 2788 else 2789 return false; 2790 2791 entry = mesh_fast_tx_get(sdata, &key); 2792 if (!entry) 2793 return false; 2794 2795 sta = rcu_dereference(entry->mpath->next_hop); 2796 if (!sta) 2797 return false; 2798 2799 if (skb_linearize(skb)) 2800 return false; 2801 2802 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2803 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2804 if (tid_tx) { 2805 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2806 return false; 2807 2808 if (tid_tx->timeout) 2809 tid_tx->last_tx = jiffies; 2810 } 2811 2812 ieee80211_aggr_check(sdata, sta, skb); 2813 2814 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2815 &skb->protocol)) 2816 hdrlen += ETH_ALEN; 2817 else 2818 skb->protocol = htons(skb->len - hdrlen); 2819 skb_set_network_header(skb, hdrlen + 2); 2820 2821 skb->dev = sdata->dev; 2822 memcpy(ð, skb->data, ETH_HLEN - 2); 2823 skb_pull(skb, 2); 2824 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2825 eth.h_dest, eth.h_source); 2826 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2827 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2828 2829 return true; 2830 } 2831 #endif 2832 2833 static ieee80211_rx_result 2834 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2835 struct sk_buff *skb) 2836 { 2837 #ifdef CONFIG_MAC80211_MESH 2838 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2839 struct ieee80211_local *local = sdata->local; 2840 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2841 struct ieee80211_hdr hdr = { 2842 .frame_control = cpu_to_le16(fc) 2843 }; 2844 struct ieee80211_hdr *fwd_hdr; 2845 struct ieee80211s_hdr *mesh_hdr; 2846 struct ieee80211_tx_info *info; 2847 struct sk_buff *fwd_skb; 2848 struct ethhdr *eth; 2849 bool multicast; 2850 int tailroom = 0; 2851 int hdrlen, mesh_hdrlen; 2852 u8 *qos; 2853 2854 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2855 return RX_CONTINUE; 2856 2857 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2858 return RX_DROP_MONITOR; 2859 2860 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2861 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2862 2863 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2864 return RX_DROP_MONITOR; 2865 2866 eth = (struct ethhdr *)skb->data; 2867 multicast = is_multicast_ether_addr(eth->h_dest); 2868 2869 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2870 if (!mesh_hdr->ttl) 2871 return RX_DROP_MONITOR; 2872 2873 /* frame is in RMC, don't forward */ 2874 if (is_multicast_ether_addr(eth->h_dest) && 2875 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 2876 return RX_DROP_MONITOR; 2877 2878 /* forward packet */ 2879 if (sdata->crypto_tx_tailroom_needed_cnt) 2880 tailroom = IEEE80211_ENCRYPT_TAILROOM; 2881 2882 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2883 struct mesh_path *mppath; 2884 char *proxied_addr; 2885 bool update = false; 2886 2887 if (multicast) 2888 proxied_addr = mesh_hdr->eaddr1; 2889 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2890 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2891 proxied_addr = mesh_hdr->eaddr2; 2892 else 2893 return RX_DROP_MONITOR; 2894 2895 rcu_read_lock(); 2896 mppath = mpp_path_lookup(sdata, proxied_addr); 2897 if (!mppath) { 2898 mpp_path_add(sdata, proxied_addr, eth->h_source); 2899 } else { 2900 spin_lock_bh(&mppath->state_lock); 2901 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 2902 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 2903 update = true; 2904 } 2905 mppath->exp_time = jiffies; 2906 spin_unlock_bh(&mppath->state_lock); 2907 } 2908 2909 /* flush fast xmit cache if the address path changed */ 2910 if (update) 2911 mesh_fast_tx_flush_addr(sdata, proxied_addr); 2912 2913 rcu_read_unlock(); 2914 } 2915 2916 /* Frame has reached destination. Don't forward */ 2917 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 2918 goto rx_accept; 2919 2920 if (!--mesh_hdr->ttl) { 2921 if (multicast) 2922 goto rx_accept; 2923 2924 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2925 return RX_DROP_MONITOR; 2926 } 2927 2928 if (!ifmsh->mshcfg.dot11MeshForwarding) { 2929 if (is_multicast_ether_addr(eth->h_dest)) 2930 goto rx_accept; 2931 2932 return RX_DROP_MONITOR; 2933 } 2934 2935 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 2936 2937 if (!multicast && 2938 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 2939 return RX_QUEUED; 2940 2941 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 2942 eth->h_dest, eth->h_source); 2943 hdrlen = ieee80211_hdrlen(hdr.frame_control); 2944 if (multicast) { 2945 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 2946 2947 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 2948 IEEE80211_ENCRYPT_HEADROOM, 2949 tailroom, GFP_ATOMIC); 2950 if (!fwd_skb) 2951 goto rx_accept; 2952 } else { 2953 fwd_skb = skb; 2954 skb = NULL; 2955 2956 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 2957 return RX_DROP_U_OOM; 2958 2959 if (skb_linearize(fwd_skb)) 2960 return RX_DROP_U_OOM; 2961 } 2962 2963 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 2964 memcpy(fwd_hdr, &hdr, hdrlen - 2); 2965 qos = ieee80211_get_qos_ctl(fwd_hdr); 2966 qos[0] = qos[1] = 0; 2967 2968 skb_reset_mac_header(fwd_skb); 2969 hdrlen += mesh_hdrlen; 2970 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 2971 &fwd_skb->protocol)) 2972 hdrlen += ETH_ALEN; 2973 else 2974 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 2975 skb_set_network_header(fwd_skb, hdrlen + 2); 2976 2977 info = IEEE80211_SKB_CB(fwd_skb); 2978 memset(info, 0, sizeof(*info)); 2979 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 2980 info->control.vif = &sdata->vif; 2981 info->control.jiffies = jiffies; 2982 fwd_skb->dev = sdata->dev; 2983 if (multicast) { 2984 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2985 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2986 /* update power mode indication when forwarding */ 2987 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2988 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2989 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2990 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2991 } else { 2992 /* unable to resolve next hop */ 2993 if (sta) 2994 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2995 hdr.addr3, 0, 2996 WLAN_REASON_MESH_PATH_NOFORWARD, 2997 sta->sta.addr); 2998 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 2999 kfree_skb(fwd_skb); 3000 goto rx_accept; 3001 } 3002 3003 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3004 ieee80211_add_pending_skb(local, fwd_skb); 3005 3006 rx_accept: 3007 if (!skb) 3008 return RX_QUEUED; 3009 3010 ieee80211_strip_8023_mesh_hdr(skb); 3011 #endif 3012 3013 return RX_CONTINUE; 3014 } 3015 3016 static ieee80211_rx_result debug_noinline 3017 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3018 { 3019 struct net_device *dev = rx->sdata->dev; 3020 struct sk_buff *skb = rx->skb; 3021 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3022 __le16 fc = hdr->frame_control; 3023 struct sk_buff_head frame_list; 3024 ieee80211_rx_result res; 3025 struct ethhdr ethhdr; 3026 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3027 3028 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3029 check_da = NULL; 3030 check_sa = NULL; 3031 } else switch (rx->sdata->vif.type) { 3032 case NL80211_IFTYPE_AP: 3033 case NL80211_IFTYPE_AP_VLAN: 3034 check_da = NULL; 3035 break; 3036 case NL80211_IFTYPE_STATION: 3037 if (!rx->sta || 3038 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3039 check_sa = NULL; 3040 break; 3041 case NL80211_IFTYPE_MESH_POINT: 3042 check_sa = NULL; 3043 check_da = NULL; 3044 break; 3045 default: 3046 break; 3047 } 3048 3049 skb->dev = dev; 3050 __skb_queue_head_init(&frame_list); 3051 3052 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3053 rx->sdata->vif.addr, 3054 rx->sdata->vif.type, 3055 data_offset, true)) 3056 return RX_DROP_U_BAD_AMSDU; 3057 3058 if (rx->sta->amsdu_mesh_control < 0) { 3059 s8 valid = -1; 3060 int i; 3061 3062 for (i = 0; i <= 2; i++) { 3063 if (!ieee80211_is_valid_amsdu(skb, i)) 3064 continue; 3065 3066 if (valid >= 0) { 3067 /* ambiguous */ 3068 valid = -1; 3069 break; 3070 } 3071 3072 valid = i; 3073 } 3074 3075 rx->sta->amsdu_mesh_control = valid; 3076 } 3077 3078 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3079 rx->sdata->vif.type, 3080 rx->local->hw.extra_tx_headroom, 3081 check_da, check_sa, 3082 rx->sta->amsdu_mesh_control); 3083 3084 while (!skb_queue_empty(&frame_list)) { 3085 rx->skb = __skb_dequeue(&frame_list); 3086 3087 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3088 switch (res) { 3089 case RX_QUEUED: 3090 continue; 3091 case RX_CONTINUE: 3092 break; 3093 default: 3094 goto free; 3095 } 3096 3097 if (!ieee80211_frame_allowed(rx, fc)) 3098 goto free; 3099 3100 ieee80211_deliver_skb(rx); 3101 continue; 3102 3103 free: 3104 dev_kfree_skb(rx->skb); 3105 } 3106 3107 return RX_QUEUED; 3108 } 3109 3110 static ieee80211_rx_result debug_noinline 3111 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3112 { 3113 struct sk_buff *skb = rx->skb; 3114 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3115 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3116 __le16 fc = hdr->frame_control; 3117 3118 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3119 return RX_CONTINUE; 3120 3121 if (unlikely(!ieee80211_is_data(fc))) 3122 return RX_CONTINUE; 3123 3124 if (unlikely(!ieee80211_is_data_present(fc))) 3125 return RX_DROP_MONITOR; 3126 3127 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3128 switch (rx->sdata->vif.type) { 3129 case NL80211_IFTYPE_AP_VLAN: 3130 if (!rx->sdata->u.vlan.sta) 3131 return RX_DROP_U_BAD_4ADDR; 3132 break; 3133 case NL80211_IFTYPE_STATION: 3134 if (!rx->sdata->u.mgd.use_4addr) 3135 return RX_DROP_U_BAD_4ADDR; 3136 break; 3137 case NL80211_IFTYPE_MESH_POINT: 3138 break; 3139 default: 3140 return RX_DROP_U_BAD_4ADDR; 3141 } 3142 } 3143 3144 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3145 return RX_DROP_U_BAD_AMSDU; 3146 3147 if (rx->key) { 3148 /* 3149 * We should not receive A-MSDUs on pre-HT connections, 3150 * and HT connections cannot use old ciphers. Thus drop 3151 * them, as in those cases we couldn't even have SPP 3152 * A-MSDUs or such. 3153 */ 3154 switch (rx->key->conf.cipher) { 3155 case WLAN_CIPHER_SUITE_WEP40: 3156 case WLAN_CIPHER_SUITE_WEP104: 3157 case WLAN_CIPHER_SUITE_TKIP: 3158 return RX_DROP_U_BAD_AMSDU_CIPHER; 3159 default: 3160 break; 3161 } 3162 } 3163 3164 return __ieee80211_rx_h_amsdu(rx, 0); 3165 } 3166 3167 static ieee80211_rx_result debug_noinline 3168 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3169 { 3170 struct ieee80211_sub_if_data *sdata = rx->sdata; 3171 struct ieee80211_local *local = rx->local; 3172 struct net_device *dev = sdata->dev; 3173 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3174 __le16 fc = hdr->frame_control; 3175 ieee80211_rx_result res; 3176 bool port_control; 3177 3178 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3179 return RX_CONTINUE; 3180 3181 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3182 return RX_DROP_MONITOR; 3183 3184 /* 3185 * Send unexpected-4addr-frame event to hostapd. For older versions, 3186 * also drop the frame to cooked monitor interfaces. 3187 */ 3188 if (ieee80211_has_a4(hdr->frame_control) && 3189 sdata->vif.type == NL80211_IFTYPE_AP) { 3190 if (rx->sta && 3191 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3192 cfg80211_rx_unexpected_4addr_frame( 3193 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 3194 return RX_DROP_MONITOR; 3195 } 3196 3197 res = __ieee80211_data_to_8023(rx, &port_control); 3198 if (unlikely(res != RX_CONTINUE)) 3199 return res; 3200 3201 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3202 if (res != RX_CONTINUE) 3203 return res; 3204 3205 if (!ieee80211_frame_allowed(rx, fc)) 3206 return RX_DROP_MONITOR; 3207 3208 /* directly handle TDLS channel switch requests/responses */ 3209 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3210 cpu_to_be16(ETH_P_TDLS))) { 3211 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3212 3213 if (pskb_may_pull(rx->skb, 3214 offsetof(struct ieee80211_tdls_data, u)) && 3215 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3216 tf->category == WLAN_CATEGORY_TDLS && 3217 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3218 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3219 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3220 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3221 rx->sta, rx->skb); 3222 return RX_QUEUED; 3223 } 3224 } 3225 3226 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3227 unlikely(port_control) && sdata->bss) { 3228 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3229 u.ap); 3230 dev = sdata->dev; 3231 rx->sdata = sdata; 3232 } 3233 3234 rx->skb->dev = dev; 3235 3236 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3237 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3238 !is_multicast_ether_addr( 3239 ((struct ethhdr *)rx->skb->data)->h_dest) && 3240 (!local->scanning && 3241 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3242 mod_timer(&local->dynamic_ps_timer, jiffies + 3243 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3244 3245 ieee80211_deliver_skb(rx); 3246 3247 return RX_QUEUED; 3248 } 3249 3250 static ieee80211_rx_result debug_noinline 3251 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3252 { 3253 struct sk_buff *skb = rx->skb; 3254 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3255 struct tid_ampdu_rx *tid_agg_rx; 3256 u16 start_seq_num; 3257 u16 tid; 3258 3259 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3260 return RX_CONTINUE; 3261 3262 if (ieee80211_is_back_req(bar->frame_control)) { 3263 struct { 3264 __le16 control, start_seq_num; 3265 } __packed bar_data; 3266 struct ieee80211_event event = { 3267 .type = BAR_RX_EVENT, 3268 }; 3269 3270 if (!rx->sta) 3271 return RX_DROP_MONITOR; 3272 3273 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3274 &bar_data, sizeof(bar_data))) 3275 return RX_DROP_MONITOR; 3276 3277 tid = le16_to_cpu(bar_data.control) >> 12; 3278 3279 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3280 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3281 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3282 WLAN_BACK_RECIPIENT, 3283 WLAN_REASON_QSTA_REQUIRE_SETUP); 3284 3285 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3286 if (!tid_agg_rx) 3287 return RX_DROP_MONITOR; 3288 3289 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3290 event.u.ba.tid = tid; 3291 event.u.ba.ssn = start_seq_num; 3292 event.u.ba.sta = &rx->sta->sta; 3293 3294 /* reset session timer */ 3295 if (tid_agg_rx->timeout) 3296 mod_timer(&tid_agg_rx->session_timer, 3297 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3298 3299 spin_lock(&tid_agg_rx->reorder_lock); 3300 /* release stored frames up to start of BAR */ 3301 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3302 start_seq_num, frames); 3303 spin_unlock(&tid_agg_rx->reorder_lock); 3304 3305 drv_event_callback(rx->local, rx->sdata, &event); 3306 3307 kfree_skb(skb); 3308 return RX_QUEUED; 3309 } 3310 3311 /* 3312 * After this point, we only want management frames, 3313 * so we can drop all remaining control frames to 3314 * cooked monitor interfaces. 3315 */ 3316 return RX_DROP_MONITOR; 3317 } 3318 3319 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3320 struct ieee80211_mgmt *mgmt, 3321 size_t len) 3322 { 3323 struct ieee80211_local *local = sdata->local; 3324 struct sk_buff *skb; 3325 struct ieee80211_mgmt *resp; 3326 3327 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3328 /* Not to own unicast address */ 3329 return; 3330 } 3331 3332 if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) || 3333 !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) { 3334 /* Not from the current AP or not associated yet. */ 3335 return; 3336 } 3337 3338 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 3339 /* Too short SA Query request frame */ 3340 return; 3341 } 3342 3343 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3344 if (skb == NULL) 3345 return; 3346 3347 skb_reserve(skb, local->hw.extra_tx_headroom); 3348 resp = skb_put_zero(skb, 24); 3349 memcpy(resp->da, mgmt->sa, ETH_ALEN); 3350 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3351 memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3352 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3353 IEEE80211_STYPE_ACTION); 3354 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 3355 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3356 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 3357 memcpy(resp->u.action.u.sa_query.trans_id, 3358 mgmt->u.action.u.sa_query.trans_id, 3359 WLAN_SA_QUERY_TR_ID_LEN); 3360 3361 ieee80211_tx_skb(sdata, skb); 3362 } 3363 3364 static void 3365 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3366 { 3367 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3368 struct ieee80211_bss_conf *bss_conf; 3369 const struct element *ie; 3370 size_t baselen; 3371 3372 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3373 NL80211_EXT_FEATURE_BSS_COLOR)) 3374 return; 3375 3376 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3377 return; 3378 3379 bss_conf = rx->link->conf; 3380 if (bss_conf->csa_active || bss_conf->color_change_active || 3381 !bss_conf->he_bss_color.enabled) 3382 return; 3383 3384 baselen = mgmt->u.beacon.variable - rx->skb->data; 3385 if (baselen > rx->skb->len) 3386 return; 3387 3388 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3389 mgmt->u.beacon.variable, 3390 rx->skb->len - baselen); 3391 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3392 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3393 const struct ieee80211_he_operation *he_oper; 3394 u8 color; 3395 3396 he_oper = (void *)(ie->data + 1); 3397 if (le32_get_bits(he_oper->he_oper_params, 3398 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3399 return; 3400 3401 color = le32_get_bits(he_oper->he_oper_params, 3402 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3403 if (color == bss_conf->he_bss_color.color) 3404 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3405 BIT_ULL(color), 3406 bss_conf->link_id); 3407 } 3408 } 3409 3410 static ieee80211_rx_result debug_noinline 3411 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3412 { 3413 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3414 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3415 3416 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3417 return RX_CONTINUE; 3418 3419 /* 3420 * From here on, look only at management frames. 3421 * Data and control frames are already handled, 3422 * and unknown (reserved) frames are useless. 3423 */ 3424 if (rx->skb->len < 24) 3425 return RX_DROP_MONITOR; 3426 3427 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3428 return RX_DROP_MONITOR; 3429 3430 /* drop too small action frames */ 3431 if (ieee80211_is_action(mgmt->frame_control) && 3432 rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 3433 return RX_DROP_U_RUNT_ACTION; 3434 3435 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3436 ieee80211_is_beacon(mgmt->frame_control) && 3437 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3438 int sig = 0; 3439 3440 /* sw bss color collision detection */ 3441 ieee80211_rx_check_bss_color_collision(rx); 3442 3443 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3444 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3445 sig = status->signal; 3446 3447 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3448 rx->skb->data, rx->skb->len, 3449 ieee80211_rx_status_to_khz(status), 3450 sig); 3451 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3452 } 3453 3454 return ieee80211_drop_unencrypted_mgmt(rx); 3455 } 3456 3457 static bool 3458 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3459 { 3460 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3461 struct ieee80211_sub_if_data *sdata = rx->sdata; 3462 3463 /* TWT actions are only supported in AP for the moment */ 3464 if (sdata->vif.type != NL80211_IFTYPE_AP) 3465 return false; 3466 3467 if (!rx->local->ops->add_twt_setup) 3468 return false; 3469 3470 if (!sdata->vif.bss_conf.twt_responder) 3471 return false; 3472 3473 if (!rx->sta) 3474 return false; 3475 3476 switch (mgmt->u.action.u.s1g.action_code) { 3477 case WLAN_S1G_TWT_SETUP: { 3478 struct ieee80211_twt_setup *twt; 3479 3480 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3481 1 + /* action code */ 3482 sizeof(struct ieee80211_twt_setup) + 3483 2 /* TWT req_type agrt */) 3484 break; 3485 3486 twt = (void *)mgmt->u.action.u.s1g.variable; 3487 if (twt->element_id != WLAN_EID_S1G_TWT) 3488 break; 3489 3490 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3491 4 + /* action code + token + tlv */ 3492 twt->length) 3493 break; 3494 3495 return true; /* queue the frame */ 3496 } 3497 case WLAN_S1G_TWT_TEARDOWN: 3498 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2) 3499 break; 3500 3501 return true; /* queue the frame */ 3502 default: 3503 break; 3504 } 3505 3506 return false; 3507 } 3508 3509 static ieee80211_rx_result debug_noinline 3510 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3511 { 3512 struct ieee80211_local *local = rx->local; 3513 struct ieee80211_sub_if_data *sdata = rx->sdata; 3514 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3515 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3516 int len = rx->skb->len; 3517 3518 if (!ieee80211_is_action(mgmt->frame_control)) 3519 return RX_CONTINUE; 3520 3521 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3522 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3523 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3524 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3525 3526 switch (mgmt->u.action.category) { 3527 case WLAN_CATEGORY_HT: 3528 /* reject HT action frames from stations not supporting HT */ 3529 if (!rx->link_sta->pub->ht_cap.ht_supported) 3530 goto invalid; 3531 3532 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3533 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3534 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3535 sdata->vif.type != NL80211_IFTYPE_AP && 3536 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3537 break; 3538 3539 /* verify action & smps_control/chanwidth are present */ 3540 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3541 goto invalid; 3542 3543 switch (mgmt->u.action.u.ht_smps.action) { 3544 case WLAN_HT_ACTION_SMPS: { 3545 struct ieee80211_supported_band *sband; 3546 enum ieee80211_smps_mode smps_mode; 3547 struct sta_opmode_info sta_opmode = {}; 3548 3549 if (sdata->vif.type != NL80211_IFTYPE_AP && 3550 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3551 goto handled; 3552 3553 /* convert to HT capability */ 3554 switch (mgmt->u.action.u.ht_smps.smps_control) { 3555 case WLAN_HT_SMPS_CONTROL_DISABLED: 3556 smps_mode = IEEE80211_SMPS_OFF; 3557 break; 3558 case WLAN_HT_SMPS_CONTROL_STATIC: 3559 smps_mode = IEEE80211_SMPS_STATIC; 3560 break; 3561 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3562 smps_mode = IEEE80211_SMPS_DYNAMIC; 3563 break; 3564 default: 3565 goto invalid; 3566 } 3567 3568 /* if no change do nothing */ 3569 if (rx->link_sta->pub->smps_mode == smps_mode) 3570 goto handled; 3571 rx->link_sta->pub->smps_mode = smps_mode; 3572 sta_opmode.smps_mode = 3573 ieee80211_smps_mode_to_smps_mode(smps_mode); 3574 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3575 3576 sband = rx->local->hw.wiphy->bands[status->band]; 3577 3578 rate_control_rate_update(local, sband, rx->link_sta, 3579 IEEE80211_RC_SMPS_CHANGED); 3580 cfg80211_sta_opmode_change_notify(sdata->dev, 3581 rx->sta->addr, 3582 &sta_opmode, 3583 GFP_ATOMIC); 3584 goto handled; 3585 } 3586 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3587 struct ieee80211_supported_band *sband; 3588 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 3589 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 3590 struct sta_opmode_info sta_opmode = {}; 3591 3592 /* If it doesn't support 40 MHz it can't change ... */ 3593 if (!(rx->link_sta->pub->ht_cap.cap & 3594 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3595 goto handled; 3596 3597 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 3598 max_bw = IEEE80211_STA_RX_BW_20; 3599 else 3600 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta); 3601 3602 /* set cur_max_bandwidth and recalc sta bw */ 3603 rx->link_sta->cur_max_bandwidth = max_bw; 3604 new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta); 3605 3606 if (rx->link_sta->pub->bandwidth == new_bw) 3607 goto handled; 3608 3609 rx->link_sta->pub->bandwidth = new_bw; 3610 sband = rx->local->hw.wiphy->bands[status->band]; 3611 sta_opmode.bw = 3612 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta); 3613 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; 3614 3615 rate_control_rate_update(local, sband, rx->link_sta, 3616 IEEE80211_RC_BW_CHANGED); 3617 cfg80211_sta_opmode_change_notify(sdata->dev, 3618 rx->sta->addr, 3619 &sta_opmode, 3620 GFP_ATOMIC); 3621 goto handled; 3622 } 3623 default: 3624 goto invalid; 3625 } 3626 3627 break; 3628 case WLAN_CATEGORY_PUBLIC: 3629 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3630 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3631 goto invalid; 3632 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3633 break; 3634 if (!rx->sta) 3635 break; 3636 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3637 break; 3638 if (mgmt->u.action.u.ext_chan_switch.action_code != 3639 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3640 break; 3641 if (len < offsetof(struct ieee80211_mgmt, 3642 u.action.u.ext_chan_switch.variable)) 3643 goto invalid; 3644 goto queue; 3645 case WLAN_CATEGORY_VHT: 3646 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3647 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3648 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3649 sdata->vif.type != NL80211_IFTYPE_AP && 3650 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3651 break; 3652 3653 /* verify action code is present */ 3654 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3655 goto invalid; 3656 3657 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 3658 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3659 /* verify opmode is present */ 3660 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3661 goto invalid; 3662 goto queue; 3663 } 3664 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3665 if (len < IEEE80211_MIN_ACTION_SIZE + 25) 3666 goto invalid; 3667 goto queue; 3668 } 3669 default: 3670 break; 3671 } 3672 break; 3673 case WLAN_CATEGORY_BACK: 3674 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3675 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3676 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3677 sdata->vif.type != NL80211_IFTYPE_AP && 3678 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3679 break; 3680 3681 /* verify action_code is present */ 3682 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3683 break; 3684 3685 switch (mgmt->u.action.u.addba_req.action_code) { 3686 case WLAN_ACTION_ADDBA_REQ: 3687 if (len < (IEEE80211_MIN_ACTION_SIZE + 3688 sizeof(mgmt->u.action.u.addba_req))) 3689 goto invalid; 3690 break; 3691 case WLAN_ACTION_ADDBA_RESP: 3692 if (len < (IEEE80211_MIN_ACTION_SIZE + 3693 sizeof(mgmt->u.action.u.addba_resp))) 3694 goto invalid; 3695 break; 3696 case WLAN_ACTION_DELBA: 3697 if (len < (IEEE80211_MIN_ACTION_SIZE + 3698 sizeof(mgmt->u.action.u.delba))) 3699 goto invalid; 3700 break; 3701 default: 3702 goto invalid; 3703 } 3704 3705 goto queue; 3706 case WLAN_CATEGORY_SPECTRUM_MGMT: 3707 /* verify action_code is present */ 3708 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3709 break; 3710 3711 switch (mgmt->u.action.u.measurement.action_code) { 3712 case WLAN_ACTION_SPCT_MSR_REQ: 3713 if (status->band != NL80211_BAND_5GHZ) 3714 break; 3715 3716 if (len < (IEEE80211_MIN_ACTION_SIZE + 3717 sizeof(mgmt->u.action.u.measurement))) 3718 break; 3719 3720 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3721 break; 3722 3723 ieee80211_process_measurement_req(sdata, mgmt, len); 3724 goto handled; 3725 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3726 u8 *bssid; 3727 if (len < (IEEE80211_MIN_ACTION_SIZE + 3728 sizeof(mgmt->u.action.u.chan_switch))) 3729 break; 3730 3731 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3732 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3733 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3734 break; 3735 3736 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3737 bssid = sdata->deflink.u.mgd.bssid; 3738 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3739 bssid = sdata->u.ibss.bssid; 3740 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3741 bssid = mgmt->sa; 3742 else 3743 break; 3744 3745 if (!ether_addr_equal(mgmt->bssid, bssid)) 3746 break; 3747 3748 goto queue; 3749 } 3750 } 3751 break; 3752 case WLAN_CATEGORY_SELF_PROTECTED: 3753 if (len < (IEEE80211_MIN_ACTION_SIZE + 3754 sizeof(mgmt->u.action.u.self_prot.action_code))) 3755 break; 3756 3757 switch (mgmt->u.action.u.self_prot.action_code) { 3758 case WLAN_SP_MESH_PEERING_OPEN: 3759 case WLAN_SP_MESH_PEERING_CLOSE: 3760 case WLAN_SP_MESH_PEERING_CONFIRM: 3761 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3762 goto invalid; 3763 if (sdata->u.mesh.user_mpm) 3764 /* userspace handles this frame */ 3765 break; 3766 goto queue; 3767 case WLAN_SP_MGK_INFORM: 3768 case WLAN_SP_MGK_ACK: 3769 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3770 goto invalid; 3771 break; 3772 } 3773 break; 3774 case WLAN_CATEGORY_MESH_ACTION: 3775 if (len < (IEEE80211_MIN_ACTION_SIZE + 3776 sizeof(mgmt->u.action.u.mesh_action.action_code))) 3777 break; 3778 3779 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3780 break; 3781 if (mesh_action_is_path_sel(mgmt) && 3782 !mesh_path_sel_is_hwmp(sdata)) 3783 break; 3784 goto queue; 3785 case WLAN_CATEGORY_S1G: 3786 if (len < offsetofend(typeof(*mgmt), 3787 u.action.u.s1g.action_code)) 3788 break; 3789 3790 switch (mgmt->u.action.u.s1g.action_code) { 3791 case WLAN_S1G_TWT_SETUP: 3792 case WLAN_S1G_TWT_TEARDOWN: 3793 if (ieee80211_process_rx_twt_action(rx)) 3794 goto queue; 3795 break; 3796 default: 3797 break; 3798 } 3799 break; 3800 case WLAN_CATEGORY_PROTECTED_EHT: 3801 if (len < offsetofend(typeof(*mgmt), 3802 u.action.u.ttlm_req.action_code)) 3803 break; 3804 3805 switch (mgmt->u.action.u.ttlm_req.action_code) { 3806 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3807 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3808 break; 3809 3810 if (len < offsetofend(typeof(*mgmt), 3811 u.action.u.ttlm_req)) 3812 goto invalid; 3813 goto queue; 3814 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3815 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3816 break; 3817 3818 if (len < offsetofend(typeof(*mgmt), 3819 u.action.u.ttlm_res)) 3820 goto invalid; 3821 goto queue; 3822 default: 3823 break; 3824 } 3825 break; 3826 } 3827 3828 return RX_CONTINUE; 3829 3830 invalid: 3831 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3832 /* will return in the next handlers */ 3833 return RX_CONTINUE; 3834 3835 handled: 3836 if (rx->sta) 3837 rx->link_sta->rx_stats.packets++; 3838 dev_kfree_skb(rx->skb); 3839 return RX_QUEUED; 3840 3841 queue: 3842 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3843 return RX_QUEUED; 3844 } 3845 3846 static ieee80211_rx_result debug_noinline 3847 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3848 { 3849 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3850 struct cfg80211_rx_info info = { 3851 .freq = ieee80211_rx_status_to_khz(status), 3852 .buf = rx->skb->data, 3853 .len = rx->skb->len, 3854 .link_id = rx->link_id, 3855 .have_link_id = rx->link_id >= 0, 3856 }; 3857 3858 /* skip known-bad action frames and return them in the next handler */ 3859 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3860 return RX_CONTINUE; 3861 3862 /* 3863 * Getting here means the kernel doesn't know how to handle 3864 * it, but maybe userspace does ... include returned frames 3865 * so userspace can register for those to know whether ones 3866 * it transmitted were processed or returned. 3867 */ 3868 3869 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3870 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3871 info.sig_dbm = status->signal; 3872 3873 if (ieee80211_is_timing_measurement(rx->skb) || 3874 ieee80211_is_ftm(rx->skb)) { 3875 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 3876 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 3877 } 3878 3879 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 3880 if (rx->sta) 3881 rx->link_sta->rx_stats.packets++; 3882 dev_kfree_skb(rx->skb); 3883 return RX_QUEUED; 3884 } 3885 3886 return RX_CONTINUE; 3887 } 3888 3889 static ieee80211_rx_result debug_noinline 3890 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 3891 { 3892 struct ieee80211_sub_if_data *sdata = rx->sdata; 3893 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3894 int len = rx->skb->len; 3895 3896 if (!ieee80211_is_action(mgmt->frame_control)) 3897 return RX_CONTINUE; 3898 3899 switch (mgmt->u.action.category) { 3900 case WLAN_CATEGORY_SA_QUERY: 3901 if (len < (IEEE80211_MIN_ACTION_SIZE + 3902 sizeof(mgmt->u.action.u.sa_query))) 3903 break; 3904 3905 switch (mgmt->u.action.u.sa_query.action) { 3906 case WLAN_ACTION_SA_QUERY_REQUEST: 3907 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3908 break; 3909 ieee80211_process_sa_query_req(sdata, mgmt, len); 3910 goto handled; 3911 } 3912 break; 3913 } 3914 3915 return RX_CONTINUE; 3916 3917 handled: 3918 if (rx->sta) 3919 rx->link_sta->rx_stats.packets++; 3920 dev_kfree_skb(rx->skb); 3921 return RX_QUEUED; 3922 } 3923 3924 static ieee80211_rx_result debug_noinline 3925 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 3926 { 3927 struct ieee80211_local *local = rx->local; 3928 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3929 struct sk_buff *nskb; 3930 struct ieee80211_sub_if_data *sdata = rx->sdata; 3931 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3932 3933 if (!ieee80211_is_action(mgmt->frame_control)) 3934 return RX_CONTINUE; 3935 3936 /* 3937 * For AP mode, hostapd is responsible for handling any action 3938 * frames that we didn't handle, including returning unknown 3939 * ones. For all other modes we will return them to the sender, 3940 * setting the 0x80 bit in the action category, as required by 3941 * 802.11-2012 9.24.4. 3942 * Newer versions of hostapd shall also use the management frame 3943 * registration mechanisms, but older ones still use cooked 3944 * monitor interfaces so push all frames there. 3945 */ 3946 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 3947 (sdata->vif.type == NL80211_IFTYPE_AP || 3948 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 3949 return RX_DROP_MONITOR; 3950 3951 if (is_multicast_ether_addr(mgmt->da)) 3952 return RX_DROP_MONITOR; 3953 3954 /* do not return rejected action frames */ 3955 if (mgmt->u.action.category & 0x80) 3956 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 3957 3958 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 3959 GFP_ATOMIC); 3960 if (nskb) { 3961 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 3962 3963 nmgmt->u.action.category |= 0x80; 3964 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 3965 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 3966 3967 memset(nskb->cb, 0, sizeof(nskb->cb)); 3968 3969 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 3970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 3971 3972 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 3973 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 3974 IEEE80211_TX_CTL_NO_CCK_RATE; 3975 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 3976 info->hw_queue = 3977 local->hw.offchannel_tx_hw_queue; 3978 } 3979 3980 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 3981 status->band); 3982 } 3983 3984 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 3985 } 3986 3987 static ieee80211_rx_result debug_noinline 3988 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 3989 { 3990 struct ieee80211_sub_if_data *sdata = rx->sdata; 3991 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 3992 3993 if (!ieee80211_is_ext(hdr->frame_control)) 3994 return RX_CONTINUE; 3995 3996 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3997 return RX_DROP_MONITOR; 3998 3999 /* for now only beacons are ext, so queue them */ 4000 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4001 4002 return RX_QUEUED; 4003 } 4004 4005 static ieee80211_rx_result debug_noinline 4006 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4007 { 4008 struct ieee80211_sub_if_data *sdata = rx->sdata; 4009 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4010 __le16 stype; 4011 4012 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4013 4014 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4015 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4016 sdata->vif.type != NL80211_IFTYPE_OCB && 4017 sdata->vif.type != NL80211_IFTYPE_STATION) 4018 return RX_DROP_MONITOR; 4019 4020 switch (stype) { 4021 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4022 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4023 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4024 /* process for all: mesh, mlme, ibss */ 4025 break; 4026 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4027 if (is_multicast_ether_addr(mgmt->da) && 4028 !is_broadcast_ether_addr(mgmt->da)) 4029 return RX_DROP_MONITOR; 4030 4031 /* process only for station/IBSS */ 4032 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4033 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4034 return RX_DROP_MONITOR; 4035 break; 4036 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4037 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4038 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4039 if (is_multicast_ether_addr(mgmt->da) && 4040 !is_broadcast_ether_addr(mgmt->da)) 4041 return RX_DROP_MONITOR; 4042 4043 /* process only for station */ 4044 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4045 return RX_DROP_MONITOR; 4046 break; 4047 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4048 /* process only for ibss and mesh */ 4049 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4050 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4051 return RX_DROP_MONITOR; 4052 break; 4053 default: 4054 return RX_DROP_MONITOR; 4055 } 4056 4057 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4058 4059 return RX_QUEUED; 4060 } 4061 4062 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 4063 struct ieee80211_rate *rate, 4064 ieee80211_rx_result reason) 4065 { 4066 struct ieee80211_sub_if_data *sdata; 4067 struct ieee80211_local *local = rx->local; 4068 struct sk_buff *skb = rx->skb, *skb2; 4069 struct net_device *prev_dev = NULL; 4070 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4071 int needed_headroom; 4072 4073 /* 4074 * If cooked monitor has been processed already, then 4075 * don't do it again. If not, set the flag. 4076 */ 4077 if (rx->flags & IEEE80211_RX_CMNTR) 4078 goto out_free_skb; 4079 rx->flags |= IEEE80211_RX_CMNTR; 4080 4081 /* If there are no cooked monitor interfaces, just free the SKB */ 4082 if (!local->cooked_mntrs) 4083 goto out_free_skb; 4084 4085 /* room for the radiotap header based on driver features */ 4086 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb); 4087 4088 if (skb_headroom(skb) < needed_headroom && 4089 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) 4090 goto out_free_skb; 4091 4092 /* prepend radiotap information */ 4093 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 4094 false); 4095 4096 skb_reset_mac_header(skb); 4097 skb->ip_summed = CHECKSUM_UNNECESSARY; 4098 skb->pkt_type = PACKET_OTHERHOST; 4099 skb->protocol = htons(ETH_P_802_2); 4100 4101 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4102 if (!ieee80211_sdata_running(sdata)) 4103 continue; 4104 4105 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 4106 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)) 4107 continue; 4108 4109 if (prev_dev) { 4110 skb2 = skb_clone(skb, GFP_ATOMIC); 4111 if (skb2) { 4112 skb2->dev = prev_dev; 4113 netif_receive_skb(skb2); 4114 } 4115 } 4116 4117 prev_dev = sdata->dev; 4118 dev_sw_netstats_rx_add(sdata->dev, skb->len); 4119 } 4120 4121 if (prev_dev) { 4122 skb->dev = prev_dev; 4123 netif_receive_skb(skb); 4124 return; 4125 } 4126 4127 out_free_skb: 4128 kfree_skb_reason(skb, (__force u32)reason); 4129 } 4130 4131 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4132 ieee80211_rx_result res) 4133 { 4134 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4135 struct ieee80211_supported_band *sband; 4136 struct ieee80211_rate *rate = NULL; 4137 4138 if (res == RX_QUEUED) { 4139 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4140 return; 4141 } 4142 4143 if (res != RX_CONTINUE) { 4144 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4145 if (rx->sta) 4146 rx->link_sta->rx_stats.dropped++; 4147 } 4148 4149 if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) == 4150 SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) { 4151 kfree_skb_reason(rx->skb, (__force u32)res); 4152 return; 4153 } 4154 4155 sband = rx->local->hw.wiphy->bands[status->band]; 4156 if (status->encoding == RX_ENC_LEGACY) 4157 rate = &sband->bitrates[status->rate_idx]; 4158 4159 ieee80211_rx_cooked_monitor(rx, rate, res); 4160 } 4161 4162 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4163 struct sk_buff_head *frames) 4164 { 4165 ieee80211_rx_result res = RX_DROP_MONITOR; 4166 struct sk_buff *skb; 4167 4168 #define CALL_RXH(rxh) \ 4169 do { \ 4170 res = rxh(rx); \ 4171 if (res != RX_CONTINUE) \ 4172 goto rxh_next; \ 4173 } while (0) 4174 4175 /* Lock here to avoid hitting all of the data used in the RX 4176 * path (e.g. key data, station data, ...) concurrently when 4177 * a frame is released from the reorder buffer due to timeout 4178 * from the timer, potentially concurrently with RX from the 4179 * driver. 4180 */ 4181 spin_lock_bh(&rx->local->rx_path_lock); 4182 4183 while ((skb = __skb_dequeue(frames))) { 4184 /* 4185 * all the other fields are valid across frames 4186 * that belong to an aMPDU since they are on the 4187 * same TID from the same station 4188 */ 4189 rx->skb = skb; 4190 4191 if (WARN_ON_ONCE(!rx->link)) 4192 goto rxh_next; 4193 4194 CALL_RXH(ieee80211_rx_h_check_more_data); 4195 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4196 CALL_RXH(ieee80211_rx_h_sta_process); 4197 CALL_RXH(ieee80211_rx_h_decrypt); 4198 CALL_RXH(ieee80211_rx_h_defragment); 4199 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4200 /* must be after MMIC verify so header is counted in MPDU mic */ 4201 CALL_RXH(ieee80211_rx_h_amsdu); 4202 CALL_RXH(ieee80211_rx_h_data); 4203 4204 /* special treatment -- needs the queue */ 4205 res = ieee80211_rx_h_ctrl(rx, frames); 4206 if (res != RX_CONTINUE) 4207 goto rxh_next; 4208 4209 CALL_RXH(ieee80211_rx_h_mgmt_check); 4210 CALL_RXH(ieee80211_rx_h_action); 4211 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4212 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4213 CALL_RXH(ieee80211_rx_h_action_return); 4214 CALL_RXH(ieee80211_rx_h_ext); 4215 CALL_RXH(ieee80211_rx_h_mgmt); 4216 4217 rxh_next: 4218 ieee80211_rx_handlers_result(rx, res); 4219 4220 #undef CALL_RXH 4221 } 4222 4223 spin_unlock_bh(&rx->local->rx_path_lock); 4224 } 4225 4226 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4227 { 4228 struct sk_buff_head reorder_release; 4229 ieee80211_rx_result res = RX_DROP_MONITOR; 4230 4231 __skb_queue_head_init(&reorder_release); 4232 4233 #define CALL_RXH(rxh) \ 4234 do { \ 4235 res = rxh(rx); \ 4236 if (res != RX_CONTINUE) \ 4237 goto rxh_next; \ 4238 } while (0) 4239 4240 CALL_RXH(ieee80211_rx_h_check_dup); 4241 CALL_RXH(ieee80211_rx_h_check); 4242 4243 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4244 4245 ieee80211_rx_handlers(rx, &reorder_release); 4246 return; 4247 4248 rxh_next: 4249 ieee80211_rx_handlers_result(rx, res); 4250 4251 #undef CALL_RXH 4252 } 4253 4254 static bool 4255 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4256 { 4257 return !!(sta->valid_links & BIT(link_id)); 4258 } 4259 4260 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4261 u8 link_id) 4262 { 4263 rx->link_id = link_id; 4264 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4265 4266 if (!rx->sta) 4267 return rx->link; 4268 4269 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4270 return false; 4271 4272 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4273 4274 return rx->link && rx->link_sta; 4275 } 4276 4277 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4278 struct sta_info *sta, int link_id) 4279 { 4280 rx->link_id = link_id; 4281 rx->sta = sta; 4282 4283 if (sta) { 4284 rx->local = sta->sdata->local; 4285 if (!rx->sdata) 4286 rx->sdata = sta->sdata; 4287 rx->link_sta = &sta->deflink; 4288 } else { 4289 rx->link_sta = NULL; 4290 } 4291 4292 if (link_id < 0) 4293 rx->link = &rx->sdata->deflink; 4294 else if (!ieee80211_rx_data_set_link(rx, link_id)) 4295 return false; 4296 4297 return true; 4298 } 4299 4300 /* 4301 * This function makes calls into the RX path, therefore 4302 * it has to be invoked under RCU read lock. 4303 */ 4304 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4305 { 4306 struct sk_buff_head frames; 4307 struct ieee80211_rx_data rx = { 4308 /* This is OK -- must be QoS data frame */ 4309 .security_idx = tid, 4310 .seqno_idx = tid, 4311 }; 4312 struct tid_ampdu_rx *tid_agg_rx; 4313 int link_id = -1; 4314 4315 /* FIXME: statistics won't be right with this */ 4316 if (sta->sta.valid_links) 4317 link_id = ffs(sta->sta.valid_links) - 1; 4318 4319 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4320 return; 4321 4322 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4323 if (!tid_agg_rx) 4324 return; 4325 4326 __skb_queue_head_init(&frames); 4327 4328 spin_lock(&tid_agg_rx->reorder_lock); 4329 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4330 spin_unlock(&tid_agg_rx->reorder_lock); 4331 4332 if (!skb_queue_empty(&frames)) { 4333 struct ieee80211_event event = { 4334 .type = BA_FRAME_TIMEOUT, 4335 .u.ba.tid = tid, 4336 .u.ba.sta = &sta->sta, 4337 }; 4338 drv_event_callback(rx.local, rx.sdata, &event); 4339 } 4340 4341 ieee80211_rx_handlers(&rx, &frames); 4342 } 4343 4344 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4345 u16 ssn, u64 filtered, 4346 u16 received_mpdus) 4347 { 4348 struct ieee80211_local *local; 4349 struct sta_info *sta; 4350 struct tid_ampdu_rx *tid_agg_rx; 4351 struct sk_buff_head frames; 4352 struct ieee80211_rx_data rx = { 4353 /* This is OK -- must be QoS data frame */ 4354 .security_idx = tid, 4355 .seqno_idx = tid, 4356 }; 4357 int i, diff; 4358 4359 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4360 return; 4361 4362 __skb_queue_head_init(&frames); 4363 4364 sta = container_of(pubsta, struct sta_info, sta); 4365 4366 local = sta->sdata->local; 4367 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4368 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4369 local->hw.max_rx_aggregation_subframes); 4370 4371 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4372 return; 4373 4374 rcu_read_lock(); 4375 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4376 if (!tid_agg_rx) 4377 goto out; 4378 4379 spin_lock_bh(&tid_agg_rx->reorder_lock); 4380 4381 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4382 int release; 4383 4384 /* release all frames in the reorder buffer */ 4385 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4386 IEEE80211_SN_MODULO; 4387 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4388 release, &frames); 4389 /* update ssn to match received ssn */ 4390 tid_agg_rx->head_seq_num = ssn; 4391 } else { 4392 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4393 &frames); 4394 } 4395 4396 /* handle the case that received ssn is behind the mac ssn. 4397 * it can be tid_agg_rx->buf_size behind and still be valid */ 4398 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4399 if (diff >= tid_agg_rx->buf_size) { 4400 tid_agg_rx->reorder_buf_filtered = 0; 4401 goto release; 4402 } 4403 filtered = filtered >> diff; 4404 ssn += diff; 4405 4406 /* update bitmap */ 4407 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4408 int index = (ssn + i) % tid_agg_rx->buf_size; 4409 4410 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4411 if (filtered & BIT_ULL(i)) 4412 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4413 } 4414 4415 /* now process also frames that the filter marking released */ 4416 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4417 4418 release: 4419 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4420 4421 ieee80211_rx_handlers(&rx, &frames); 4422 4423 out: 4424 rcu_read_unlock(); 4425 } 4426 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4427 4428 /* main receive path */ 4429 4430 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4431 { 4432 return ether_addr_equal(raddr, addr) || 4433 is_broadcast_ether_addr(raddr); 4434 } 4435 4436 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4437 { 4438 struct ieee80211_sub_if_data *sdata = rx->sdata; 4439 struct sk_buff *skb = rx->skb; 4440 struct ieee80211_hdr *hdr = (void *)skb->data; 4441 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4442 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4443 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4444 ieee80211_is_s1g_beacon(hdr->frame_control); 4445 4446 switch (sdata->vif.type) { 4447 case NL80211_IFTYPE_STATION: 4448 if (!bssid && !sdata->u.mgd.use_4addr) 4449 return false; 4450 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4451 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4452 return false; 4453 if (multicast) 4454 return true; 4455 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4456 case NL80211_IFTYPE_ADHOC: 4457 if (!bssid) 4458 return false; 4459 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4460 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4461 !is_valid_ether_addr(hdr->addr2)) 4462 return false; 4463 if (ieee80211_is_beacon(hdr->frame_control)) 4464 return true; 4465 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4466 return false; 4467 if (!multicast && 4468 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4469 return false; 4470 if (!rx->sta) { 4471 int rate_idx; 4472 if (status->encoding != RX_ENC_LEGACY) 4473 rate_idx = 0; /* TODO: HT/VHT rates */ 4474 else 4475 rate_idx = status->rate_idx; 4476 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4477 BIT(rate_idx)); 4478 } 4479 return true; 4480 case NL80211_IFTYPE_OCB: 4481 if (!bssid) 4482 return false; 4483 if (!ieee80211_is_data_present(hdr->frame_control)) 4484 return false; 4485 if (!is_broadcast_ether_addr(bssid)) 4486 return false; 4487 if (!multicast && 4488 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4489 return false; 4490 if (!rx->sta) { 4491 int rate_idx; 4492 if (status->encoding != RX_ENC_LEGACY) 4493 rate_idx = 0; /* TODO: HT rates */ 4494 else 4495 rate_idx = status->rate_idx; 4496 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4497 BIT(rate_idx)); 4498 } 4499 return true; 4500 case NL80211_IFTYPE_MESH_POINT: 4501 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4502 return false; 4503 if (multicast) 4504 return true; 4505 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4506 case NL80211_IFTYPE_AP_VLAN: 4507 case NL80211_IFTYPE_AP: 4508 if (!bssid) 4509 return ieee80211_is_our_addr(sdata, hdr->addr1, 4510 &rx->link_id); 4511 4512 if (!is_broadcast_ether_addr(bssid) && 4513 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4514 /* 4515 * Accept public action frames even when the 4516 * BSSID doesn't match, this is used for P2P 4517 * and location updates. Note that mac80211 4518 * itself never looks at these frames. 4519 */ 4520 if (!multicast && 4521 !ieee80211_is_our_addr(sdata, hdr->addr1, 4522 &rx->link_id)) 4523 return false; 4524 if (ieee80211_is_public_action(hdr, skb->len)) 4525 return true; 4526 return ieee80211_is_beacon(hdr->frame_control); 4527 } 4528 4529 if (!ieee80211_has_tods(hdr->frame_control)) { 4530 /* ignore data frames to TDLS-peers */ 4531 if (ieee80211_is_data(hdr->frame_control)) 4532 return false; 4533 /* ignore action frames to TDLS-peers */ 4534 if (ieee80211_is_action(hdr->frame_control) && 4535 !is_broadcast_ether_addr(bssid) && 4536 !ether_addr_equal(bssid, hdr->addr1)) 4537 return false; 4538 } 4539 4540 /* 4541 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4542 * the BSSID - we've checked that already but may have accepted 4543 * the wildcard (ff:ff:ff:ff:ff:ff). 4544 * 4545 * It also says: 4546 * The BSSID of the Data frame is determined as follows: 4547 * a) If the STA is contained within an AP or is associated 4548 * with an AP, the BSSID is the address currently in use 4549 * by the STA contained in the AP. 4550 * 4551 * So we should not accept data frames with an address that's 4552 * multicast. 4553 * 4554 * Accepting it also opens a security problem because stations 4555 * could encrypt it with the GTK and inject traffic that way. 4556 */ 4557 if (ieee80211_is_data(hdr->frame_control) && multicast) 4558 return false; 4559 4560 return true; 4561 case NL80211_IFTYPE_P2P_DEVICE: 4562 return ieee80211_is_public_action(hdr, skb->len) || 4563 ieee80211_is_probe_req(hdr->frame_control) || 4564 ieee80211_is_probe_resp(hdr->frame_control) || 4565 ieee80211_is_beacon(hdr->frame_control); 4566 case NL80211_IFTYPE_NAN: 4567 /* Currently no frames on NAN interface are allowed */ 4568 return false; 4569 default: 4570 break; 4571 } 4572 4573 WARN_ON_ONCE(1); 4574 return false; 4575 } 4576 4577 void ieee80211_check_fast_rx(struct sta_info *sta) 4578 { 4579 struct ieee80211_sub_if_data *sdata = sta->sdata; 4580 struct ieee80211_local *local = sdata->local; 4581 struct ieee80211_key *key; 4582 struct ieee80211_fast_rx fastrx = { 4583 .dev = sdata->dev, 4584 .vif_type = sdata->vif.type, 4585 .control_port_protocol = sdata->control_port_protocol, 4586 }, *old, *new = NULL; 4587 u32 offload_flags; 4588 bool set_offload = false; 4589 bool assign = false; 4590 bool offload; 4591 4592 /* use sparse to check that we don't return without updating */ 4593 __acquire(check_fast_rx); 4594 4595 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4596 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4597 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4598 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4599 4600 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4601 4602 /* fast-rx doesn't do reordering */ 4603 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4604 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4605 goto clear; 4606 4607 switch (sdata->vif.type) { 4608 case NL80211_IFTYPE_STATION: 4609 if (sta->sta.tdls) { 4610 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4611 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4612 fastrx.expected_ds_bits = 0; 4613 } else { 4614 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4615 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4616 fastrx.expected_ds_bits = 4617 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4618 } 4619 4620 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4621 fastrx.expected_ds_bits |= 4622 cpu_to_le16(IEEE80211_FCTL_TODS); 4623 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4624 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4625 } 4626 4627 if (!sdata->u.mgd.powersave) 4628 break; 4629 4630 /* software powersave is a huge mess, avoid all of it */ 4631 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4632 goto clear; 4633 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4634 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4635 goto clear; 4636 break; 4637 case NL80211_IFTYPE_AP_VLAN: 4638 case NL80211_IFTYPE_AP: 4639 /* parallel-rx requires this, at least with calls to 4640 * ieee80211_sta_ps_transition() 4641 */ 4642 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4643 goto clear; 4644 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4645 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4646 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4647 4648 fastrx.internal_forward = 4649 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4650 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4651 !sdata->u.vlan.sta); 4652 4653 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4654 sdata->u.vlan.sta) { 4655 fastrx.expected_ds_bits |= 4656 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4657 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4658 fastrx.internal_forward = 0; 4659 } 4660 4661 break; 4662 case NL80211_IFTYPE_MESH_POINT: 4663 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4664 IEEE80211_FCTL_TODS); 4665 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4666 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4667 break; 4668 default: 4669 goto clear; 4670 } 4671 4672 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4673 goto clear; 4674 4675 rcu_read_lock(); 4676 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4677 if (!key) 4678 key = rcu_dereference(sdata->default_unicast_key); 4679 if (key) { 4680 switch (key->conf.cipher) { 4681 case WLAN_CIPHER_SUITE_TKIP: 4682 /* we don't want to deal with MMIC in fast-rx */ 4683 goto clear_rcu; 4684 case WLAN_CIPHER_SUITE_CCMP: 4685 case WLAN_CIPHER_SUITE_CCMP_256: 4686 case WLAN_CIPHER_SUITE_GCMP: 4687 case WLAN_CIPHER_SUITE_GCMP_256: 4688 break; 4689 default: 4690 /* We also don't want to deal with 4691 * WEP or cipher scheme. 4692 */ 4693 goto clear_rcu; 4694 } 4695 4696 fastrx.key = true; 4697 fastrx.icv_len = key->conf.icv_len; 4698 } 4699 4700 assign = true; 4701 clear_rcu: 4702 rcu_read_unlock(); 4703 clear: 4704 __release(check_fast_rx); 4705 4706 if (assign) 4707 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4708 4709 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4710 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4711 4712 if (assign && offload) 4713 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4714 else 4715 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4716 4717 if (set_offload) 4718 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4719 4720 spin_lock_bh(&sta->lock); 4721 old = rcu_dereference_protected(sta->fast_rx, true); 4722 rcu_assign_pointer(sta->fast_rx, new); 4723 spin_unlock_bh(&sta->lock); 4724 4725 if (old) 4726 kfree_rcu(old, rcu_head); 4727 } 4728 4729 void ieee80211_clear_fast_rx(struct sta_info *sta) 4730 { 4731 struct ieee80211_fast_rx *old; 4732 4733 spin_lock_bh(&sta->lock); 4734 old = rcu_dereference_protected(sta->fast_rx, true); 4735 RCU_INIT_POINTER(sta->fast_rx, NULL); 4736 spin_unlock_bh(&sta->lock); 4737 4738 if (old) 4739 kfree_rcu(old, rcu_head); 4740 } 4741 4742 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4743 { 4744 struct ieee80211_local *local = sdata->local; 4745 struct sta_info *sta; 4746 4747 lockdep_assert_wiphy(local->hw.wiphy); 4748 4749 list_for_each_entry(sta, &local->sta_list, list) { 4750 if (sdata != sta->sdata && 4751 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4752 continue; 4753 ieee80211_check_fast_rx(sta); 4754 } 4755 } 4756 4757 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4758 { 4759 struct ieee80211_local *local = sdata->local; 4760 4761 lockdep_assert_wiphy(local->hw.wiphy); 4762 4763 __ieee80211_check_fast_rx_iface(sdata); 4764 } 4765 4766 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4767 struct ieee80211_fast_rx *fast_rx, 4768 int orig_len) 4769 { 4770 struct ieee80211_sta_rx_stats *stats; 4771 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4772 struct sta_info *sta = rx->sta; 4773 struct link_sta_info *link_sta; 4774 struct sk_buff *skb = rx->skb; 4775 void *sa = skb->data + ETH_ALEN; 4776 void *da = skb->data; 4777 4778 if (rx->link_id >= 0) { 4779 link_sta = rcu_dereference(sta->link[rx->link_id]); 4780 if (WARN_ON_ONCE(!link_sta)) { 4781 dev_kfree_skb(rx->skb); 4782 return; 4783 } 4784 } else { 4785 link_sta = &sta->deflink; 4786 } 4787 4788 stats = &link_sta->rx_stats; 4789 if (fast_rx->uses_rss) 4790 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4791 4792 /* statistics part of ieee80211_rx_h_sta_process() */ 4793 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4794 stats->last_signal = status->signal; 4795 if (!fast_rx->uses_rss) 4796 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4797 -status->signal); 4798 } 4799 4800 if (status->chains) { 4801 int i; 4802 4803 stats->chains = status->chains; 4804 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4805 int signal = status->chain_signal[i]; 4806 4807 if (!(status->chains & BIT(i))) 4808 continue; 4809 4810 stats->chain_signal_last[i] = signal; 4811 if (!fast_rx->uses_rss) 4812 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4813 -signal); 4814 } 4815 } 4816 /* end of statistics */ 4817 4818 stats->last_rx = jiffies; 4819 stats->last_rate = sta_stats_encode_rate(status); 4820 4821 stats->fragments++; 4822 stats->packets++; 4823 4824 skb->dev = fast_rx->dev; 4825 4826 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4827 4828 /* The seqno index has the same property as needed 4829 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4830 * for non-QoS-data frames. Here we know it's a data 4831 * frame, so count MSDUs. 4832 */ 4833 u64_stats_update_begin(&stats->syncp); 4834 stats->msdu[rx->seqno_idx]++; 4835 stats->bytes += orig_len; 4836 u64_stats_update_end(&stats->syncp); 4837 4838 if (fast_rx->internal_forward) { 4839 struct sk_buff *xmit_skb = NULL; 4840 if (is_multicast_ether_addr(da)) { 4841 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4842 } else if (!ether_addr_equal(da, sa) && 4843 sta_info_get(rx->sdata, da)) { 4844 xmit_skb = skb; 4845 skb = NULL; 4846 } 4847 4848 if (xmit_skb) { 4849 /* 4850 * Send to wireless media and increase priority by 256 4851 * to keep the received priority instead of 4852 * reclassifying the frame (see cfg80211_classify8021d). 4853 */ 4854 xmit_skb->priority += 256; 4855 xmit_skb->protocol = htons(ETH_P_802_3); 4856 skb_reset_network_header(xmit_skb); 4857 skb_reset_mac_header(xmit_skb); 4858 dev_queue_xmit(xmit_skb); 4859 } 4860 4861 if (!skb) 4862 return; 4863 } 4864 4865 /* deliver to local stack */ 4866 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4867 ieee80211_deliver_skb_to_local_stack(skb, rx); 4868 } 4869 4870 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4871 struct ieee80211_fast_rx *fast_rx) 4872 { 4873 struct sk_buff *skb = rx->skb; 4874 struct ieee80211_hdr *hdr = (void *)skb->data; 4875 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4876 static ieee80211_rx_result res; 4877 int orig_len = skb->len; 4878 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4879 int snap_offs = hdrlen; 4880 struct { 4881 u8 snap[sizeof(rfc1042_header)]; 4882 __be16 proto; 4883 } *payload __aligned(2); 4884 struct { 4885 u8 da[ETH_ALEN]; 4886 u8 sa[ETH_ALEN]; 4887 } addrs __aligned(2); 4888 struct ieee80211_sta_rx_stats *stats; 4889 4890 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4891 * to a common data structure; drivers can implement that per queue 4892 * but we don't have that information in mac80211 4893 */ 4894 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4895 return false; 4896 4897 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4898 4899 /* If using encryption, we also need to have: 4900 * - PN_VALIDATED: similar, but the implementation is tricky 4901 * - DECRYPTED: necessary for PN_VALIDATED 4902 */ 4903 if (fast_rx->key && 4904 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4905 return false; 4906 4907 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4908 return false; 4909 4910 if (unlikely(ieee80211_is_frag(hdr))) 4911 return false; 4912 4913 /* Since our interface address cannot be multicast, this 4914 * implicitly also rejects multicast frames without the 4915 * explicit check. 4916 * 4917 * We shouldn't get any *data* frames not addressed to us 4918 * (AP mode will accept multicast *management* frames), but 4919 * punting here will make it go through the full checks in 4920 * ieee80211_accept_frame(). 4921 */ 4922 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4923 return false; 4924 4925 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4926 IEEE80211_FCTL_TODS)) != 4927 fast_rx->expected_ds_bits) 4928 return false; 4929 4930 /* assign the key to drop unencrypted frames (later) 4931 * and strip the IV/MIC if necessary 4932 */ 4933 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4934 /* GCMP header length is the same */ 4935 snap_offs += IEEE80211_CCMP_HDR_LEN; 4936 } 4937 4938 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 4939 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 4940 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4941 return false; 4942 4943 payload = (void *)(skb->data + snap_offs); 4944 4945 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4946 return false; 4947 4948 /* Don't handle these here since they require special code. 4949 * Accept AARP and IPX even though they should come with a 4950 * bridge-tunnel header - but if we get them this way then 4951 * there's little point in discarding them. 4952 */ 4953 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4954 payload->proto == fast_rx->control_port_protocol)) 4955 return false; 4956 } 4957 4958 /* after this point, don't punt to the slowpath! */ 4959 4960 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 4961 pskb_trim(skb, skb->len - fast_rx->icv_len)) 4962 goto drop; 4963 4964 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 4965 goto drop; 4966 4967 if (status->rx_flags & IEEE80211_RX_AMSDU) { 4968 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 4969 RX_QUEUED) 4970 goto drop; 4971 4972 return true; 4973 } 4974 4975 /* do the header conversion - first grab the addresses */ 4976 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 4977 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 4978 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 4979 skb_pull(skb, snap_offs - 2); 4980 put_unaligned_be16(skb->len - 2, skb->data); 4981 } else { 4982 skb_postpull_rcsum(skb, skb->data + snap_offs, 4983 sizeof(rfc1042_header) + 2); 4984 4985 /* remove the SNAP but leave the ethertype */ 4986 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 4987 } 4988 /* push the addresses in front */ 4989 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 4990 4991 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 4992 switch (res) { 4993 case RX_QUEUED: 4994 return true; 4995 case RX_CONTINUE: 4996 break; 4997 default: 4998 goto drop; 4999 } 5000 5001 ieee80211_rx_8023(rx, fast_rx, orig_len); 5002 5003 return true; 5004 drop: 5005 dev_kfree_skb(skb); 5006 5007 if (fast_rx->uses_rss) 5008 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 5009 else 5010 stats = &rx->link_sta->rx_stats; 5011 5012 stats->dropped++; 5013 return true; 5014 } 5015 5016 /* 5017 * This function returns whether or not the SKB 5018 * was destined for RX processing or not, which, 5019 * if consume is true, is equivalent to whether 5020 * or not the skb was consumed. 5021 */ 5022 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 5023 struct sk_buff *skb, bool consume) 5024 { 5025 struct ieee80211_local *local = rx->local; 5026 struct ieee80211_sub_if_data *sdata = rx->sdata; 5027 struct ieee80211_hdr *hdr = (void *)skb->data; 5028 struct link_sta_info *link_sta = rx->link_sta; 5029 struct ieee80211_link_data *link = rx->link; 5030 5031 rx->skb = skb; 5032 5033 /* See if we can do fast-rx; if we have to copy we already lost, 5034 * so punt in that case. We should never have to deliver a data 5035 * frame to multiple interfaces anyway. 5036 * 5037 * We skip the ieee80211_accept_frame() call and do the necessary 5038 * checking inside ieee80211_invoke_fast_rx(). 5039 */ 5040 if (consume && rx->sta) { 5041 struct ieee80211_fast_rx *fast_rx; 5042 5043 fast_rx = rcu_dereference(rx->sta->fast_rx); 5044 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5045 return true; 5046 } 5047 5048 if (!ieee80211_accept_frame(rx)) 5049 return false; 5050 5051 if (!consume) { 5052 struct skb_shared_hwtstamps *shwt; 5053 5054 rx->skb = skb_copy(skb, GFP_ATOMIC); 5055 if (!rx->skb) { 5056 if (net_ratelimit()) 5057 wiphy_debug(local->hw.wiphy, 5058 "failed to copy skb for %s\n", 5059 sdata->name); 5060 return true; 5061 } 5062 5063 /* skb_copy() does not copy the hw timestamps, so copy it 5064 * explicitly 5065 */ 5066 shwt = skb_hwtstamps(rx->skb); 5067 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5068 5069 /* Update the hdr pointer to the new skb for translation below */ 5070 hdr = (struct ieee80211_hdr *)rx->skb->data; 5071 } 5072 5073 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5074 is_unicast_ether_addr(hdr->addr1) && 5075 !ieee80211_is_probe_resp(hdr->frame_control) && 5076 !ieee80211_is_beacon(hdr->frame_control)) { 5077 /* translate to MLD addresses */ 5078 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5079 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5080 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5081 ether_addr_copy(hdr->addr2, rx->sta->addr); 5082 /* translate A3 only if it's the BSSID */ 5083 if (!ieee80211_has_tods(hdr->frame_control) && 5084 !ieee80211_has_fromds(hdr->frame_control)) { 5085 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5086 ether_addr_copy(hdr->addr3, rx->sta->addr); 5087 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5088 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5089 } 5090 /* not needed for A4 since it can only carry the SA */ 5091 } 5092 5093 ieee80211_invoke_rx_handlers(rx); 5094 return true; 5095 } 5096 5097 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5098 struct ieee80211_sta *pubsta, 5099 struct sk_buff *skb, 5100 struct list_head *list) 5101 { 5102 struct ieee80211_local *local = hw_to_local(hw); 5103 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5104 struct ieee80211_fast_rx *fast_rx; 5105 struct ieee80211_rx_data rx; 5106 struct sta_info *sta; 5107 int link_id = -1; 5108 5109 memset(&rx, 0, sizeof(rx)); 5110 rx.skb = skb; 5111 rx.local = local; 5112 rx.list = list; 5113 rx.link_id = -1; 5114 5115 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5116 5117 /* drop frame if too short for header */ 5118 if (skb->len < sizeof(struct ethhdr)) 5119 goto drop; 5120 5121 if (!pubsta) 5122 goto drop; 5123 5124 if (status->link_valid) 5125 link_id = status->link_id; 5126 5127 /* 5128 * TODO: Should the frame be dropped if the right link_id is not 5129 * available? Or may be it is fine in the current form to proceed with 5130 * the frame processing because with frame being in 802.3 format, 5131 * link_id is used only for stats purpose and updating the stats on 5132 * the deflink is fine? 5133 */ 5134 sta = container_of(pubsta, struct sta_info, sta); 5135 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5136 goto drop; 5137 5138 fast_rx = rcu_dereference(rx.sta->fast_rx); 5139 if (!fast_rx) 5140 goto drop; 5141 5142 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5143 return; 5144 5145 drop: 5146 dev_kfree_skb(skb); 5147 } 5148 5149 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5150 struct sk_buff *skb, bool consume) 5151 { 5152 struct link_sta_info *link_sta; 5153 struct ieee80211_hdr *hdr = (void *)skb->data; 5154 struct sta_info *sta; 5155 int link_id = -1; 5156 5157 /* 5158 * Look up link station first, in case there's a 5159 * chance that they might have a link address that 5160 * is identical to the MLD address, that way we'll 5161 * have the link information if needed. 5162 */ 5163 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5164 if (link_sta) { 5165 sta = link_sta->sta; 5166 link_id = link_sta->link_id; 5167 } else { 5168 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5169 5170 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5171 if (status->link_valid) 5172 link_id = status->link_id; 5173 } 5174 5175 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5176 return false; 5177 5178 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5179 } 5180 5181 /* 5182 * This is the actual Rx frames handler. as it belongs to Rx path it must 5183 * be called with rcu_read_lock protection. 5184 */ 5185 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5186 struct ieee80211_sta *pubsta, 5187 struct sk_buff *skb, 5188 struct list_head *list) 5189 { 5190 struct ieee80211_local *local = hw_to_local(hw); 5191 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5192 struct ieee80211_sub_if_data *sdata; 5193 struct ieee80211_hdr *hdr; 5194 __le16 fc; 5195 struct ieee80211_rx_data rx; 5196 struct ieee80211_sub_if_data *prev; 5197 struct rhlist_head *tmp; 5198 int err = 0; 5199 5200 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5201 memset(&rx, 0, sizeof(rx)); 5202 rx.skb = skb; 5203 rx.local = local; 5204 rx.list = list; 5205 rx.link_id = -1; 5206 5207 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5208 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5209 5210 if (ieee80211_is_mgmt(fc)) { 5211 /* drop frame if too short for header */ 5212 if (skb->len < ieee80211_hdrlen(fc)) 5213 err = -ENOBUFS; 5214 else 5215 err = skb_linearize(skb); 5216 } else { 5217 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5218 } 5219 5220 if (err) { 5221 dev_kfree_skb(skb); 5222 return; 5223 } 5224 5225 hdr = (struct ieee80211_hdr *)skb->data; 5226 ieee80211_parse_qos(&rx); 5227 ieee80211_verify_alignment(&rx); 5228 5229 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5230 ieee80211_is_beacon(hdr->frame_control) || 5231 ieee80211_is_s1g_beacon(hdr->frame_control))) 5232 ieee80211_scan_rx(local, skb); 5233 5234 if (ieee80211_is_data(fc)) { 5235 struct sta_info *sta, *prev_sta; 5236 int link_id = -1; 5237 5238 if (status->link_valid) 5239 link_id = status->link_id; 5240 5241 if (pubsta) { 5242 sta = container_of(pubsta, struct sta_info, sta); 5243 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5244 goto out; 5245 5246 /* 5247 * In MLO connection, fetch the link_id using addr2 5248 * when the driver does not pass link_id in status. 5249 * When the address translation is already performed by 5250 * driver/hw, the valid link_id must be passed in 5251 * status. 5252 */ 5253 5254 if (!status->link_valid && pubsta->mlo) { 5255 struct link_sta_info *link_sta; 5256 5257 link_sta = link_sta_info_get_bss(rx.sdata, 5258 hdr->addr2); 5259 if (!link_sta) 5260 goto out; 5261 5262 ieee80211_rx_data_set_link(&rx, link_sta->link_id); 5263 } 5264 5265 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5266 return; 5267 goto out; 5268 } 5269 5270 prev_sta = NULL; 5271 5272 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5273 if (!prev_sta) { 5274 prev_sta = sta; 5275 continue; 5276 } 5277 5278 rx.sdata = prev_sta->sdata; 5279 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5280 goto out; 5281 5282 if (!status->link_valid && prev_sta->sta.mlo) 5283 continue; 5284 5285 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5286 5287 prev_sta = sta; 5288 } 5289 5290 if (prev_sta) { 5291 rx.sdata = prev_sta->sdata; 5292 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5293 goto out; 5294 5295 if (!status->link_valid && prev_sta->sta.mlo) 5296 goto out; 5297 5298 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5299 return; 5300 goto out; 5301 } 5302 } 5303 5304 prev = NULL; 5305 5306 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5307 if (!ieee80211_sdata_running(sdata)) 5308 continue; 5309 5310 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5311 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5312 continue; 5313 5314 /* 5315 * frame is destined for this interface, but if it's 5316 * not also for the previous one we handle that after 5317 * the loop to avoid copying the SKB once too much 5318 */ 5319 5320 if (!prev) { 5321 prev = sdata; 5322 continue; 5323 } 5324 5325 rx.sdata = prev; 5326 ieee80211_rx_for_interface(&rx, skb, false); 5327 5328 prev = sdata; 5329 } 5330 5331 if (prev) { 5332 rx.sdata = prev; 5333 5334 if (ieee80211_rx_for_interface(&rx, skb, true)) 5335 return; 5336 } 5337 5338 out: 5339 dev_kfree_skb(skb); 5340 } 5341 5342 /* 5343 * This is the receive path handler. It is called by a low level driver when an 5344 * 802.11 MPDU is received from the hardware. 5345 */ 5346 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5347 struct sk_buff *skb, struct list_head *list) 5348 { 5349 struct ieee80211_local *local = hw_to_local(hw); 5350 struct ieee80211_rate *rate = NULL; 5351 struct ieee80211_supported_band *sband; 5352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5353 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5354 5355 WARN_ON_ONCE(softirq_count() == 0); 5356 5357 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5358 goto drop; 5359 5360 sband = local->hw.wiphy->bands[status->band]; 5361 if (WARN_ON(!sband)) 5362 goto drop; 5363 5364 /* 5365 * If we're suspending, it is possible although not too likely 5366 * that we'd be receiving frames after having already partially 5367 * quiesced the stack. We can't process such frames then since 5368 * that might, for example, cause stations to be added or other 5369 * driver callbacks be invoked. 5370 */ 5371 if (unlikely(local->quiescing || local->suspended)) 5372 goto drop; 5373 5374 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5375 if (unlikely(local->in_reconfig)) 5376 goto drop; 5377 5378 /* 5379 * The same happens when we're not even started, 5380 * but that's worth a warning. 5381 */ 5382 if (WARN_ON(!local->started)) 5383 goto drop; 5384 5385 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 5386 /* 5387 * Validate the rate, unless a PLCP error means that 5388 * we probably can't have a valid rate here anyway. 5389 */ 5390 5391 switch (status->encoding) { 5392 case RX_ENC_HT: 5393 /* 5394 * rate_idx is MCS index, which can be [0-76] 5395 * as documented on: 5396 * 5397 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5398 * 5399 * Anything else would be some sort of driver or 5400 * hardware error. The driver should catch hardware 5401 * errors. 5402 */ 5403 if (WARN(status->rate_idx > 76, 5404 "Rate marked as an HT rate but passed " 5405 "status->rate_idx is not " 5406 "an MCS index [0-76]: %d (0x%02x)\n", 5407 status->rate_idx, 5408 status->rate_idx)) 5409 goto drop; 5410 break; 5411 case RX_ENC_VHT: 5412 if (WARN_ONCE(status->rate_idx > 11 || 5413 !status->nss || 5414 status->nss > 8, 5415 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5416 status->rate_idx, status->nss)) 5417 goto drop; 5418 break; 5419 case RX_ENC_HE: 5420 if (WARN_ONCE(status->rate_idx > 11 || 5421 !status->nss || 5422 status->nss > 8, 5423 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5424 status->rate_idx, status->nss)) 5425 goto drop; 5426 break; 5427 case RX_ENC_EHT: 5428 if (WARN_ONCE(status->rate_idx > 15 || 5429 !status->nss || 5430 status->nss > 8 || 5431 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5432 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5433 status->rate_idx, status->nss, status->eht.gi)) 5434 goto drop; 5435 break; 5436 default: 5437 WARN_ON_ONCE(1); 5438 fallthrough; 5439 case RX_ENC_LEGACY: 5440 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5441 goto drop; 5442 rate = &sband->bitrates[status->rate_idx]; 5443 } 5444 } 5445 5446 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5447 goto drop; 5448 5449 status->rx_flags = 0; 5450 5451 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5452 5453 /* 5454 * Frames with failed FCS/PLCP checksum are not returned, 5455 * all other frames are returned without radiotap header 5456 * if it was previously present. 5457 * Also, frames with less than 16 bytes are dropped. 5458 */ 5459 if (!(status->flag & RX_FLAG_8023)) 5460 skb = ieee80211_rx_monitor(local, skb, rate); 5461 if (skb) { 5462 if ((status->flag & RX_FLAG_8023) || 5463 ieee80211_is_data_present(hdr->frame_control)) 5464 ieee80211_tpt_led_trig_rx(local, skb->len); 5465 5466 if (status->flag & RX_FLAG_8023) 5467 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5468 else 5469 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5470 } 5471 5472 kcov_remote_stop(); 5473 return; 5474 drop: 5475 kfree_skb(skb); 5476 } 5477 EXPORT_SYMBOL(ieee80211_rx_list); 5478 5479 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5480 struct sk_buff *skb, struct napi_struct *napi) 5481 { 5482 struct sk_buff *tmp; 5483 LIST_HEAD(list); 5484 5485 5486 /* 5487 * key references and virtual interfaces are protected using RCU 5488 * and this requires that we are in a read-side RCU section during 5489 * receive processing 5490 */ 5491 rcu_read_lock(); 5492 ieee80211_rx_list(hw, pubsta, skb, &list); 5493 rcu_read_unlock(); 5494 5495 if (!napi) { 5496 netif_receive_skb_list(&list); 5497 return; 5498 } 5499 5500 list_for_each_entry_safe(skb, tmp, &list, list) { 5501 skb_list_del_init(skb); 5502 napi_gro_receive(napi, skb); 5503 } 5504 } 5505 EXPORT_SYMBOL(ieee80211_rx_napi); 5506 5507 /* This is a version of the rx handler that can be called from hard irq 5508 * context. Post the skb on the queue and schedule the tasklet */ 5509 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5510 { 5511 struct ieee80211_local *local = hw_to_local(hw); 5512 5513 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5514 5515 skb->pkt_type = IEEE80211_RX_MSG; 5516 skb_queue_tail(&local->skb_queue, skb); 5517 tasklet_schedule(&local->tasklet); 5518 } 5519 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5520