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) 2018-2025 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 struct link_sta_info *link_sta_info; 236 237 if (link_id >= 0) { 238 link_sta_info = rcu_dereference(sta->link[link_id]); 239 if (!link_sta_info) 240 return; 241 } else { 242 link_sta_info = &sta->deflink; 243 } 244 245 link_sta_info->rx_stats.packets++; 246 } 247 } 248 249 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata, 250 int link_id, 251 struct sta_info *sta, 252 struct sk_buff *skb) 253 { 254 skb->protocol = 0; 255 __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb); 256 } 257 258 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, 259 struct sk_buff *skb, 260 int rtap_space) 261 { 262 struct { 263 struct ieee80211_hdr_3addr hdr; 264 u8 category; 265 u8 action_code; 266 } __packed __aligned(2) action; 267 268 if (!sdata) 269 return; 270 271 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1); 272 273 if (skb->len < rtap_space + sizeof(action) + 274 VHT_MUMIMO_GROUPS_DATA_LEN) 275 return; 276 277 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) 278 return; 279 280 skb_copy_bits(skb, rtap_space, &action, sizeof(action)); 281 282 if (!ieee80211_is_action(action.hdr.frame_control)) 283 return; 284 285 if (action.category != WLAN_CATEGORY_VHT) 286 return; 287 288 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) 289 return; 290 291 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) 292 return; 293 294 skb = skb_copy(skb, GFP_ATOMIC); 295 if (!skb) 296 return; 297 298 ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb); 299 } 300 301 /* 302 * ieee80211_add_rx_radiotap_header - add radiotap header 303 * 304 * add a radiotap header containing all the fields which the hardware provided. 305 */ 306 static void 307 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 308 struct sk_buff *skb, 309 struct ieee80211_rate *rate, 310 int rtap_len, bool has_fcs) 311 { 312 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 313 struct ieee80211_radiotap_header *rthdr; 314 unsigned char *pos; 315 __le32 *it_present; 316 u32 it_present_val; 317 u16 rx_flags = 0; 318 u16 channel_flags = 0; 319 u32 tlvs_len = 0; 320 int mpdulen, chain; 321 unsigned long chains = status->chains; 322 struct ieee80211_radiotap_he he = {}; 323 struct ieee80211_radiotap_he_mu he_mu = {}; 324 struct ieee80211_radiotap_lsig lsig = {}; 325 326 if (status->flag & RX_FLAG_RADIOTAP_HE) { 327 he = *(struct ieee80211_radiotap_he *)skb->data; 328 skb_pull(skb, sizeof(he)); 329 WARN_ON_ONCE(status->encoding != RX_ENC_HE); 330 } 331 332 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { 333 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; 334 skb_pull(skb, sizeof(he_mu)); 335 } 336 337 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 338 lsig = *(struct ieee80211_radiotap_lsig *)skb->data; 339 skb_pull(skb, sizeof(lsig)); 340 } 341 342 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) { 343 /* data is pointer at tlv all other info was pulled off */ 344 tlvs_len = skb_mac_header(skb) - skb->data; 345 } 346 347 mpdulen = skb->len; 348 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 349 mpdulen += FCS_LEN; 350 351 rthdr = skb_push(skb, rtap_len - tlvs_len); 352 memset(rthdr, 0, rtap_len - tlvs_len); 353 it_present = &rthdr->it_present; 354 355 /* radiotap header, set always present flags */ 356 rthdr->it_len = cpu_to_le16(rtap_len); 357 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 358 BIT(IEEE80211_RADIOTAP_CHANNEL) | 359 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 360 361 if (!status->chains) 362 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 363 364 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 365 it_present_val |= 366 BIT(IEEE80211_RADIOTAP_EXT) | 367 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 368 put_unaligned_le32(it_present_val, it_present); 369 it_present++; 370 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 371 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 372 } 373 374 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 375 it_present_val |= BIT(IEEE80211_RADIOTAP_TLV); 376 377 put_unaligned_le32(it_present_val, it_present); 378 379 /* This references through an offset into it_optional[] rather 380 * than via it_present otherwise later uses of pos will cause 381 * the compiler to think we have walked past the end of the 382 * struct member. 383 */ 384 pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional]; 385 386 /* the order of the following fields is important */ 387 388 /* IEEE80211_RADIOTAP_TSFT */ 389 if (ieee80211_have_rx_timestamp(status)) { 390 /* padding */ 391 while ((pos - (u8 *)rthdr) & 7) 392 *pos++ = 0; 393 put_unaligned_le64( 394 ieee80211_calculate_rx_timestamp(local, status, 395 mpdulen, 0), 396 pos); 397 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT)); 398 pos += 8; 399 } 400 401 /* IEEE80211_RADIOTAP_FLAGS */ 402 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 403 *pos |= IEEE80211_RADIOTAP_F_FCS; 404 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 405 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 406 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) 407 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 408 pos++; 409 410 /* IEEE80211_RADIOTAP_RATE */ 411 if (!rate || status->encoding != RX_ENC_LEGACY) { 412 /* 413 * Without rate information don't add it. If we have, 414 * MCS information is a separate field in radiotap, 415 * added below. The byte here is needed as padding 416 * for the channel though, so initialise it to 0. 417 */ 418 *pos = 0; 419 } else { 420 int shift = 0; 421 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE)); 422 if (status->bw == RATE_INFO_BW_10) 423 shift = 1; 424 else if (status->bw == RATE_INFO_BW_5) 425 shift = 2; 426 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 427 } 428 pos++; 429 430 /* IEEE80211_RADIOTAP_CHANNEL */ 431 /* TODO: frequency offset in KHz */ 432 put_unaligned_le16(status->freq, pos); 433 pos += 2; 434 if (status->bw == RATE_INFO_BW_10) 435 channel_flags |= IEEE80211_CHAN_HALF; 436 else if (status->bw == RATE_INFO_BW_5) 437 channel_flags |= IEEE80211_CHAN_QUARTER; 438 439 if (status->band == NL80211_BAND_5GHZ || 440 status->band == NL80211_BAND_6GHZ) 441 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 442 else if (status->encoding != RX_ENC_LEGACY) 443 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 444 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 445 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 446 else if (rate) 447 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 448 else 449 channel_flags |= IEEE80211_CHAN_2GHZ; 450 put_unaligned_le16(channel_flags, pos); 451 pos += 2; 452 453 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 454 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 455 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 456 *pos = status->signal; 457 rthdr->it_present |= 458 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL)); 459 pos++; 460 } 461 462 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 463 464 if (!status->chains) { 465 /* IEEE80211_RADIOTAP_ANTENNA */ 466 *pos = status->antenna; 467 pos++; 468 } 469 470 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 471 472 /* IEEE80211_RADIOTAP_RX_FLAGS */ 473 /* ensure 2 byte alignment for the 2 byte field as required */ 474 if ((pos - (u8 *)rthdr) & 1) 475 *pos++ = 0; 476 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 477 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 478 put_unaligned_le16(rx_flags, pos); 479 pos += 2; 480 481 if (status->encoding == RX_ENC_HT) { 482 unsigned int stbc; 483 484 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS)); 485 *pos = local->hw.radiotap_mcs_details; 486 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 487 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT; 488 if (status->enc_flags & RX_ENC_FLAG_LDPC) 489 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC; 490 pos++; 491 *pos = 0; 492 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 493 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 494 if (status->bw == RATE_INFO_BW_40) 495 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 496 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 497 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 498 if (status->enc_flags & RX_ENC_FLAG_LDPC) 499 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 500 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; 501 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 502 pos++; 503 *pos++ = status->rate_idx; 504 } 505 506 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 507 u16 flags = 0; 508 509 /* ensure 4 byte alignment */ 510 while ((pos - (u8 *)rthdr) & 3) 511 pos++; 512 rthdr->it_present |= 513 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS)); 514 put_unaligned_le32(status->ampdu_reference, pos); 515 pos += 4; 516 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 517 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 518 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 519 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 520 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 521 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 522 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) 523 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; 524 if (status->flag & RX_FLAG_AMPDU_EOF_BIT) 525 flags |= IEEE80211_RADIOTAP_AMPDU_EOF; 526 put_unaligned_le16(flags, pos); 527 pos += 2; 528 *pos++ = 0; 529 *pos++ = 0; 530 } 531 532 if (status->encoding == RX_ENC_VHT) { 533 u16 known = local->hw.radiotap_vht_details; 534 535 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT)); 536 put_unaligned_le16(known, pos); 537 pos += 2; 538 /* flags */ 539 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 540 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 541 /* in VHT, STBC is binary */ 542 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) 543 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 544 if (status->enc_flags & RX_ENC_FLAG_BF) 545 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 546 pos++; 547 /* bandwidth */ 548 switch (status->bw) { 549 case RATE_INFO_BW_80: 550 *pos++ = 4; 551 break; 552 case RATE_INFO_BW_160: 553 *pos++ = 11; 554 break; 555 case RATE_INFO_BW_40: 556 *pos++ = 1; 557 break; 558 default: 559 *pos++ = 0; 560 } 561 /* MCS/NSS */ 562 *pos = (status->rate_idx << 4) | status->nss; 563 pos += 4; 564 /* coding field */ 565 if (status->enc_flags & RX_ENC_FLAG_LDPC) 566 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 567 pos++; 568 /* group ID */ 569 pos++; 570 /* partial_aid */ 571 pos += 2; 572 } 573 574 if (local->hw.radiotap_timestamp.units_pos >= 0) { 575 u16 accuracy = 0; 576 u8 flags; 577 u64 ts; 578 579 rthdr->it_present |= 580 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP)); 581 582 /* ensure 8 byte alignment */ 583 while ((pos - (u8 *)rthdr) & 7) 584 pos++; 585 586 if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) { 587 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT; 588 ts = status->mactime; 589 } else { 590 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; 591 ts = status->device_timestamp; 592 } 593 594 put_unaligned_le64(ts, pos); 595 pos += sizeof(u64); 596 597 if (local->hw.radiotap_timestamp.accuracy >= 0) { 598 accuracy = local->hw.radiotap_timestamp.accuracy; 599 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; 600 } 601 put_unaligned_le16(accuracy, pos); 602 pos += sizeof(u16); 603 604 *pos++ = local->hw.radiotap_timestamp.units_pos; 605 *pos++ = flags; 606 } 607 608 if (status->encoding == RX_ENC_HE && 609 status->flag & RX_FLAG_RADIOTAP_HE) { 610 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) 611 612 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { 613 he.data6 |= HE_PREP(DATA6_NSTS, 614 FIELD_GET(RX_ENC_FLAG_STBC_MASK, 615 status->enc_flags)); 616 he.data3 |= HE_PREP(DATA3_STBC, 1); 617 } else { 618 he.data6 |= HE_PREP(DATA6_NSTS, status->nss); 619 } 620 621 #define CHECK_GI(s) \ 622 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ 623 (int)NL80211_RATE_INFO_HE_GI_##s) 624 625 CHECK_GI(0_8); 626 CHECK_GI(1_6); 627 CHECK_GI(3_2); 628 629 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); 630 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); 631 he.data3 |= HE_PREP(DATA3_CODING, 632 !!(status->enc_flags & RX_ENC_FLAG_LDPC)); 633 634 he.data5 |= HE_PREP(DATA5_GI, status->he_gi); 635 636 switch (status->bw) { 637 case RATE_INFO_BW_20: 638 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 639 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); 640 break; 641 case RATE_INFO_BW_40: 642 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 643 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); 644 break; 645 case RATE_INFO_BW_80: 646 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 647 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); 648 break; 649 case RATE_INFO_BW_160: 650 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 651 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); 652 break; 653 case RATE_INFO_BW_HE_RU: 654 #define CHECK_RU_ALLOC(s) \ 655 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ 656 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) 657 658 CHECK_RU_ALLOC(26); 659 CHECK_RU_ALLOC(52); 660 CHECK_RU_ALLOC(106); 661 CHECK_RU_ALLOC(242); 662 CHECK_RU_ALLOC(484); 663 CHECK_RU_ALLOC(996); 664 CHECK_RU_ALLOC(2x996); 665 666 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 667 status->he_ru + 4); 668 break; 669 default: 670 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); 671 } 672 673 /* ensure 2 byte alignment */ 674 while ((pos - (u8 *)rthdr) & 1) 675 pos++; 676 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE)); 677 memcpy(pos, &he, sizeof(he)); 678 pos += sizeof(he); 679 } 680 681 if (status->encoding == RX_ENC_HE && 682 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 683 /* ensure 2 byte alignment */ 684 while ((pos - (u8 *)rthdr) & 1) 685 pos++; 686 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU)); 687 memcpy(pos, &he_mu, sizeof(he_mu)); 688 pos += sizeof(he_mu); 689 } 690 691 if (status->flag & RX_FLAG_NO_PSDU) { 692 rthdr->it_present |= 693 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU)); 694 *pos++ = status->zero_length_psdu_type; 695 } 696 697 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 698 /* ensure 2 byte alignment */ 699 while ((pos - (u8 *)rthdr) & 1) 700 pos++; 701 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG)); 702 memcpy(pos, &lsig, sizeof(lsig)); 703 pos += sizeof(lsig); 704 } 705 706 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 707 *pos++ = status->chain_signal[chain]; 708 *pos++ = chain; 709 } 710 } 711 712 static struct sk_buff * 713 ieee80211_make_monitor_skb(struct ieee80211_local *local, 714 struct sk_buff **origskb, 715 struct ieee80211_rate *rate, 716 int rtap_space, bool use_origskb) 717 { 718 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); 719 int rt_hdrlen, needed_headroom; 720 struct sk_buff *skb; 721 722 /* room for the radiotap header based on driver features */ 723 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); 724 needed_headroom = rt_hdrlen - rtap_space; 725 726 if (use_origskb) { 727 /* only need to expand headroom if necessary */ 728 skb = *origskb; 729 *origskb = NULL; 730 731 /* 732 * This shouldn't trigger often because most devices have an 733 * RX header they pull before we get here, and that should 734 * be big enough for our radiotap information. We should 735 * probably export the length to drivers so that we can have 736 * them allocate enough headroom to start with. 737 */ 738 if (skb_headroom(skb) < needed_headroom && 739 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 740 dev_kfree_skb(skb); 741 return NULL; 742 } 743 } else { 744 /* 745 * Need to make a copy and possibly remove radiotap header 746 * and FCS from the original. 747 */ 748 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD, 749 0, GFP_ATOMIC); 750 751 if (!skb) 752 return NULL; 753 } 754 755 /* prepend radiotap information */ 756 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 757 758 skb_reset_mac_header(skb); 759 skb->ip_summed = CHECKSUM_UNNECESSARY; 760 skb->pkt_type = PACKET_OTHERHOST; 761 skb->protocol = htons(ETH_P_802_2); 762 763 return skb; 764 } 765 766 /* 767 * This function copies a received frame to all monitor interfaces and 768 * returns a cleaned-up SKB that no longer includes the FCS nor the 769 * radiotap header the driver might have added. 770 */ 771 static struct sk_buff * 772 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 773 struct ieee80211_rate *rate) 774 { 775 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 776 struct ieee80211_sub_if_data *sdata, *prev_sdata = NULL; 777 struct sk_buff *skb, *monskb = NULL; 778 int present_fcs_len = 0; 779 unsigned int rtap_space = 0; 780 struct ieee80211_sub_if_data *monitor_sdata = 781 rcu_dereference(local->monitor_sdata); 782 bool only_monitor = false; 783 unsigned int min_head_len; 784 785 if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END && 786 !skb_mac_header_was_set(origskb))) { 787 /* with this skb no way to know where frame payload starts */ 788 dev_kfree_skb(origskb); 789 return NULL; 790 } 791 792 if (status->flag & RX_FLAG_RADIOTAP_HE) 793 rtap_space += sizeof(struct ieee80211_radiotap_he); 794 795 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 796 rtap_space += sizeof(struct ieee80211_radiotap_he_mu); 797 798 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 799 rtap_space += sizeof(struct ieee80211_radiotap_lsig); 800 801 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 802 rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space]; 803 804 min_head_len = rtap_space; 805 806 /* 807 * First, we may need to make a copy of the skb because 808 * (1) we need to modify it for radiotap (if not present), and 809 * (2) the other RX handlers will modify the skb we got. 810 * 811 * We don't need to, of course, if we aren't going to return 812 * the SKB because it has a bad FCS/PLCP checksum. 813 */ 814 815 if (!(status->flag & RX_FLAG_NO_PSDU)) { 816 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 817 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { 818 /* driver bug */ 819 WARN_ON(1); 820 dev_kfree_skb(origskb); 821 return NULL; 822 } 823 present_fcs_len = FCS_LEN; 824 } 825 826 /* also consider the hdr->frame_control */ 827 min_head_len += 2; 828 } 829 830 /* ensure that the expected data elements are in skb head */ 831 if (!pskb_may_pull(origskb, min_head_len)) { 832 dev_kfree_skb(origskb); 833 return NULL; 834 } 835 836 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); 837 838 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { 839 if (only_monitor) { 840 dev_kfree_skb(origskb); 841 return NULL; 842 } 843 844 return ieee80211_clean_skb(origskb, present_fcs_len, 845 rtap_space); 846 } 847 848 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); 849 850 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { 851 struct cfg80211_chan_def *chandef; 852 853 chandef = &sdata->vif.bss_conf.chanreq.oper; 854 if (chandef->chan && 855 chandef->chan->center_freq != status->freq) 856 continue; 857 858 if (!prev_sdata) { 859 prev_sdata = sdata; 860 continue; 861 } 862 863 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 864 ieee80211_handle_mu_mimo_mon(sdata, origskb, rtap_space); 865 866 if (!monskb) 867 monskb = ieee80211_make_monitor_skb(local, &origskb, 868 rate, rtap_space, 869 false); 870 if (!monskb) 871 continue; 872 873 skb = skb_clone(monskb, GFP_ATOMIC); 874 if (!skb) 875 continue; 876 877 skb->dev = prev_sdata->dev; 878 dev_sw_netstats_rx_add(skb->dev, skb->len); 879 netif_receive_skb(skb); 880 prev_sdata = sdata; 881 } 882 883 if (prev_sdata) { 884 if (monskb) 885 skb = monskb; 886 else 887 skb = ieee80211_make_monitor_skb(local, &origskb, 888 rate, rtap_space, 889 only_monitor); 890 if (skb) { 891 skb->dev = prev_sdata->dev; 892 dev_sw_netstats_rx_add(skb->dev, skb->len); 893 netif_receive_skb(skb); 894 } 895 } 896 897 if (!origskb) 898 return NULL; 899 900 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space); 901 } 902 903 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 904 { 905 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 906 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 907 int tid, seqno_idx, security_idx; 908 909 /* does the frame have a qos control field? */ 910 if (ieee80211_is_data_qos(hdr->frame_control)) { 911 u8 *qc = ieee80211_get_qos_ctl(hdr); 912 /* frame has qos control */ 913 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 914 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 915 status->rx_flags |= IEEE80211_RX_AMSDU; 916 917 seqno_idx = tid; 918 security_idx = tid; 919 } else { 920 /* 921 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 922 * 923 * Sequence numbers for management frames, QoS data 924 * frames with a broadcast/multicast address in the 925 * Address 1 field, and all non-QoS data frames sent 926 * by QoS STAs are assigned using an additional single 927 * modulo-4096 counter, [...] 928 * 929 * We also use that counter for non-QoS STAs. 930 */ 931 seqno_idx = IEEE80211_NUM_TIDS; 932 security_idx = 0; 933 if (ieee80211_is_mgmt(hdr->frame_control)) 934 security_idx = IEEE80211_NUM_TIDS; 935 tid = 0; 936 } 937 938 rx->seqno_idx = seqno_idx; 939 rx->security_idx = security_idx; 940 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 941 * For now, set skb->priority to 0 for other cases. */ 942 rx->skb->priority = (tid > 7) ? 0 : tid; 943 } 944 945 /** 946 * DOC: Packet alignment 947 * 948 * Drivers always need to pass packets that are aligned to two-byte boundaries 949 * to the stack. 950 * 951 * Additionally, they should, if possible, align the payload data in a way that 952 * guarantees that the contained IP header is aligned to a four-byte 953 * boundary. In the case of regular frames, this simply means aligning the 954 * payload to a four-byte boundary (because either the IP header is directly 955 * contained, or IV/RFC1042 headers that have a length divisible by four are 956 * in front of it). If the payload data is not properly aligned and the 957 * architecture doesn't support efficient unaligned operations, mac80211 958 * will align the data. 959 * 960 * With A-MSDU frames, however, the payload data address must yield two modulo 961 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 962 * push the IP header further back to a multiple of four again. Thankfully, the 963 * specs were sane enough this time around to require padding each A-MSDU 964 * subframe to a length that is a multiple of four. 965 * 966 * Padding like Atheros hardware adds which is between the 802.11 header and 967 * the payload is not supported; the driver is required to move the 802.11 968 * header to be directly in front of the payload in that case. 969 */ 970 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 971 { 972 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 973 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 974 #endif 975 } 976 977 978 /* rx handlers */ 979 980 static int ieee80211_is_unicast_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 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 992 { 993 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 994 995 if (!is_multicast_ether_addr(hdr->addr1)) 996 return 0; 997 998 return ieee80211_is_robust_mgmt_frame(skb); 999 } 1000 1001 1002 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 1003 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 1004 { 1005 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 1006 struct ieee80211_mmie *mmie; 1007 struct ieee80211_mmie_16 *mmie16; 1008 1009 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 1010 return -1; 1011 1012 if (!ieee80211_is_robust_mgmt_frame(skb) && 1013 !ieee80211_is_beacon(hdr->frame_control)) 1014 return -1; /* not a robust management frame */ 1015 1016 mmie = (struct ieee80211_mmie *) 1017 (skb->data + skb->len - sizeof(*mmie)); 1018 if (mmie->element_id == WLAN_EID_MMIE && 1019 mmie->length == sizeof(*mmie) - 2) 1020 return le16_to_cpu(mmie->key_id); 1021 1022 mmie16 = (struct ieee80211_mmie_16 *) 1023 (skb->data + skb->len - sizeof(*mmie16)); 1024 if (skb->len >= 24 + sizeof(*mmie16) && 1025 mmie16->element_id == WLAN_EID_MMIE && 1026 mmie16->length == sizeof(*mmie16) - 2) 1027 return le16_to_cpu(mmie16->key_id); 1028 1029 return -1; 1030 } 1031 1032 static int ieee80211_get_keyid(struct sk_buff *skb) 1033 { 1034 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1035 __le16 fc = hdr->frame_control; 1036 int hdrlen = ieee80211_hdrlen(fc); 1037 u8 keyid; 1038 1039 /* WEP, TKIP, CCMP and GCMP */ 1040 if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN)) 1041 return -EINVAL; 1042 1043 skb_copy_bits(skb, hdrlen + 3, &keyid, 1); 1044 1045 keyid >>= 6; 1046 1047 return keyid; 1048 } 1049 1050 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 1051 { 1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1053 char *dev_addr = rx->sdata->vif.addr; 1054 1055 if (ieee80211_is_data(hdr->frame_control)) { 1056 if (is_multicast_ether_addr(hdr->addr1)) { 1057 if (ieee80211_has_tods(hdr->frame_control) || 1058 !ieee80211_has_fromds(hdr->frame_control)) 1059 return RX_DROP; 1060 if (ether_addr_equal(hdr->addr3, dev_addr)) 1061 return RX_DROP; 1062 } else { 1063 if (!ieee80211_has_a4(hdr->frame_control)) 1064 return RX_DROP; 1065 if (ether_addr_equal(hdr->addr4, dev_addr)) 1066 return RX_DROP; 1067 } 1068 } 1069 1070 /* If there is not an established peer link and this is not a peer link 1071 * establisment frame, beacon or probe, drop the frame. 1072 */ 1073 1074 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 1075 struct ieee80211_mgmt *mgmt; 1076 1077 if (!ieee80211_is_mgmt(hdr->frame_control)) 1078 return RX_DROP; 1079 1080 if (ieee80211_is_action(hdr->frame_control)) { 1081 u8 category; 1082 1083 /* make sure category field is present */ 1084 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 1085 return RX_DROP; 1086 1087 mgmt = (struct ieee80211_mgmt *)hdr; 1088 category = mgmt->u.action.category; 1089 if (category != WLAN_CATEGORY_MESH_ACTION && 1090 category != WLAN_CATEGORY_SELF_PROTECTED) 1091 return RX_DROP; 1092 return RX_CONTINUE; 1093 } 1094 1095 if (ieee80211_is_probe_req(hdr->frame_control) || 1096 ieee80211_is_probe_resp(hdr->frame_control) || 1097 ieee80211_is_beacon(hdr->frame_control) || 1098 ieee80211_is_auth(hdr->frame_control)) 1099 return RX_CONTINUE; 1100 1101 return RX_DROP; 1102 } 1103 1104 return RX_CONTINUE; 1105 } 1106 1107 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, 1108 int index) 1109 { 1110 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index]; 1111 struct sk_buff *tail = skb_peek_tail(frames); 1112 struct ieee80211_rx_status *status; 1113 1114 if (tid_agg_rx->reorder_buf_filtered && 1115 tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) 1116 return true; 1117 1118 if (!tail) 1119 return false; 1120 1121 status = IEEE80211_SKB_RXCB(tail); 1122 if (status->flag & RX_FLAG_AMSDU_MORE) 1123 return false; 1124 1125 return true; 1126 } 1127 1128 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 1129 struct tid_ampdu_rx *tid_agg_rx, 1130 int index, 1131 struct sk_buff_head *frames) 1132 { 1133 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; 1134 struct sk_buff *skb; 1135 struct ieee80211_rx_status *status; 1136 1137 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1138 1139 if (skb_queue_empty(skb_list)) 1140 goto no_frame; 1141 1142 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1143 __skb_queue_purge(skb_list); 1144 goto no_frame; 1145 } 1146 1147 /* release frames from the reorder ring buffer */ 1148 tid_agg_rx->stored_mpdu_num--; 1149 while ((skb = __skb_dequeue(skb_list))) { 1150 status = IEEE80211_SKB_RXCB(skb); 1151 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 1152 __skb_queue_tail(frames, skb); 1153 } 1154 1155 no_frame: 1156 if (tid_agg_rx->reorder_buf_filtered) 1157 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 1158 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1159 } 1160 1161 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 1162 struct tid_ampdu_rx *tid_agg_rx, 1163 u16 head_seq_num, 1164 struct sk_buff_head *frames) 1165 { 1166 int index; 1167 1168 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1169 1170 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 1171 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1172 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1173 frames); 1174 } 1175 } 1176 1177 /* 1178 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 1179 * the skb was added to the buffer longer than this time ago, the earlier 1180 * frames that have not yet been received are assumed to be lost and the skb 1181 * can be released for processing. This may also release other skb's from the 1182 * reorder buffer if there are no additional gaps between the frames. 1183 * 1184 * Callers must hold tid_agg_rx->reorder_lock. 1185 */ 1186 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 1187 1188 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 1189 struct tid_ampdu_rx *tid_agg_rx, 1190 struct sk_buff_head *frames) 1191 { 1192 int index, i, j; 1193 1194 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1195 1196 /* release the buffer until next missing frame */ 1197 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1198 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && 1199 tid_agg_rx->stored_mpdu_num) { 1200 /* 1201 * No buffers ready to be released, but check whether any 1202 * frames in the reorder buffer have timed out. 1203 */ 1204 int skipped = 1; 1205 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 1206 j = (j + 1) % tid_agg_rx->buf_size) { 1207 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { 1208 skipped++; 1209 continue; 1210 } 1211 if (skipped && 1212 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 1213 HT_RX_REORDER_BUF_TIMEOUT)) 1214 goto set_release_timer; 1215 1216 /* don't leave incomplete A-MSDUs around */ 1217 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 1218 i = (i + 1) % tid_agg_rx->buf_size) 1219 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]); 1220 1221 ht_dbg_ratelimited(sdata, 1222 "release an RX reorder frame due to timeout on earlier frames\n"); 1223 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 1224 frames); 1225 1226 /* 1227 * Increment the head seq# also for the skipped slots. 1228 */ 1229 tid_agg_rx->head_seq_num = 1230 (tid_agg_rx->head_seq_num + 1231 skipped) & IEEE80211_SN_MASK; 1232 skipped = 0; 1233 } 1234 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1235 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1236 frames); 1237 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1238 } 1239 1240 if (tid_agg_rx->stored_mpdu_num) { 1241 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1242 1243 for (; j != (index - 1) % tid_agg_rx->buf_size; 1244 j = (j + 1) % tid_agg_rx->buf_size) { 1245 if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) 1246 break; 1247 } 1248 1249 set_release_timer: 1250 1251 if (!tid_agg_rx->removed) 1252 mod_timer(&tid_agg_rx->reorder_timer, 1253 tid_agg_rx->reorder_time[j] + 1 + 1254 HT_RX_REORDER_BUF_TIMEOUT); 1255 } else { 1256 timer_delete(&tid_agg_rx->reorder_timer); 1257 } 1258 } 1259 1260 /* 1261 * As this function belongs to the RX path it must be under 1262 * rcu_read_lock protection. It returns false if the frame 1263 * can be processed immediately, true if it was consumed. 1264 */ 1265 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 1266 struct tid_ampdu_rx *tid_agg_rx, 1267 struct sk_buff *skb, 1268 struct sk_buff_head *frames) 1269 { 1270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1271 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1272 u16 mpdu_seq_num = ieee80211_get_sn(hdr); 1273 u16 head_seq_num, buf_size; 1274 int index; 1275 bool ret = true; 1276 1277 spin_lock(&tid_agg_rx->reorder_lock); 1278 1279 /* 1280 * Offloaded BA sessions have no known starting sequence number so pick 1281 * one from first Rxed frame for this tid after BA was started. 1282 */ 1283 if (unlikely(tid_agg_rx->auto_seq)) { 1284 tid_agg_rx->auto_seq = false; 1285 tid_agg_rx->ssn = mpdu_seq_num; 1286 tid_agg_rx->head_seq_num = mpdu_seq_num; 1287 } 1288 1289 buf_size = tid_agg_rx->buf_size; 1290 head_seq_num = tid_agg_rx->head_seq_num; 1291 1292 /* 1293 * If the current MPDU's SN is smaller than the SSN, it shouldn't 1294 * be reordered. 1295 */ 1296 if (unlikely(!tid_agg_rx->started)) { 1297 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1298 ret = false; 1299 goto out; 1300 } 1301 tid_agg_rx->started = true; 1302 } 1303 1304 /* frame with out of date sequence number */ 1305 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1306 dev_kfree_skb(skb); 1307 goto out; 1308 } 1309 1310 /* 1311 * If frame the sequence number exceeds our buffering window 1312 * size release some previous frames to make room for this one. 1313 */ 1314 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 1315 head_seq_num = ieee80211_sn_inc( 1316 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 1317 /* release stored frames up to new head to stack */ 1318 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 1319 head_seq_num, frames); 1320 } 1321 1322 /* Now the new frame is always in the range of the reordering buffer */ 1323 1324 index = mpdu_seq_num % tid_agg_rx->buf_size; 1325 1326 /* check if we already stored this frame */ 1327 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1328 dev_kfree_skb(skb); 1329 goto out; 1330 } 1331 1332 /* 1333 * If the current MPDU is in the right order and nothing else 1334 * is stored we can process it directly, no need to buffer it. 1335 * If it is first but there's something stored, we may be able 1336 * to release frames after this one. 1337 */ 1338 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1339 tid_agg_rx->stored_mpdu_num == 0) { 1340 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1341 tid_agg_rx->head_seq_num = 1342 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1343 ret = false; 1344 goto out; 1345 } 1346 1347 /* put the frame in the reordering buffer */ 1348 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); 1349 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1350 tid_agg_rx->reorder_time[index] = jiffies; 1351 tid_agg_rx->stored_mpdu_num++; 1352 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1353 } 1354 1355 out: 1356 spin_unlock(&tid_agg_rx->reorder_lock); 1357 return ret; 1358 } 1359 1360 /* 1361 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1362 * true if the MPDU was buffered, false if it should be processed. 1363 */ 1364 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1365 struct sk_buff_head *frames) 1366 { 1367 struct sk_buff *skb = rx->skb; 1368 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1369 struct sta_info *sta = rx->sta; 1370 struct tid_ampdu_rx *tid_agg_rx; 1371 u16 sc; 1372 u8 tid, ack_policy; 1373 1374 if (!ieee80211_is_data_qos(hdr->frame_control) || 1375 is_multicast_ether_addr(hdr->addr1)) 1376 goto dont_reorder; 1377 1378 /* 1379 * filter the QoS data rx stream according to 1380 * STA/TID and check if this STA/TID is on aggregation 1381 */ 1382 1383 if (!sta) 1384 goto dont_reorder; 1385 1386 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1387 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1388 tid = ieee80211_get_tid(hdr); 1389 1390 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1391 if (!tid_agg_rx) { 1392 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1393 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1394 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1395 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1396 WLAN_BACK_RECIPIENT, 1397 WLAN_REASON_QSTA_REQUIRE_SETUP); 1398 goto dont_reorder; 1399 } 1400 1401 /* qos null data frames are excluded */ 1402 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1403 goto dont_reorder; 1404 1405 /* not part of a BA session */ 1406 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 1407 goto dont_reorder; 1408 1409 /* new, potentially un-ordered, ampdu frame - process it */ 1410 1411 /* reset session timer */ 1412 if (tid_agg_rx->timeout) 1413 tid_agg_rx->last_rx = jiffies; 1414 1415 /* if this mpdu is fragmented - terminate rx aggregation session */ 1416 sc = le16_to_cpu(hdr->seq_ctrl); 1417 if (sc & IEEE80211_SCTL_FRAG) { 1418 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb); 1419 return; 1420 } 1421 1422 /* 1423 * No locking needed -- we will only ever process one 1424 * RX packet at a time, and thus own tid_agg_rx. All 1425 * other code manipulating it needs to (and does) make 1426 * sure that we cannot get to it any more before doing 1427 * anything with it. 1428 */ 1429 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1430 frames)) 1431 return; 1432 1433 dont_reorder: 1434 __skb_queue_tail(frames, skb); 1435 } 1436 1437 static ieee80211_rx_result debug_noinline 1438 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1439 { 1440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1441 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1442 1443 if (status->flag & RX_FLAG_DUP_VALIDATED) 1444 return RX_CONTINUE; 1445 1446 /* 1447 * Drop duplicate 802.11 retransmissions 1448 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1449 */ 1450 1451 if (rx->skb->len < 24) 1452 return RX_CONTINUE; 1453 1454 if (ieee80211_is_ctl(hdr->frame_control) || 1455 ieee80211_is_any_nullfunc(hdr->frame_control)) 1456 return RX_CONTINUE; 1457 1458 if (!rx->sta) 1459 return RX_CONTINUE; 1460 1461 if (unlikely(is_multicast_ether_addr(hdr->addr1))) { 1462 struct ieee80211_sub_if_data *sdata = rx->sdata; 1463 u16 sn = ieee80211_get_sn(hdr); 1464 1465 if (!ieee80211_is_data_present(hdr->frame_control)) 1466 return RX_CONTINUE; 1467 1468 if (!ieee80211_vif_is_mld(&sdata->vif) || 1469 sdata->vif.type != NL80211_IFTYPE_STATION) 1470 return RX_CONTINUE; 1471 1472 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO && 1473 ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last)) 1474 return RX_DROP_U_DUP; 1475 1476 sdata->u.mgd.mcast_seq_last = sn; 1477 return RX_CONTINUE; 1478 } 1479 1480 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1481 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1482 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1483 rx->link_sta->rx_stats.num_duplicates++; 1484 return RX_DROP_U_DUP; 1485 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1486 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1487 } 1488 1489 return RX_CONTINUE; 1490 } 1491 1492 static ieee80211_rx_result debug_noinline 1493 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1494 { 1495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1496 1497 /* Drop disallowed frame classes based on STA auth/assoc state; 1498 * IEEE 802.11, Chap 5.5. 1499 * 1500 * mac80211 filters only based on association state, i.e. it drops 1501 * Class 3 frames from not associated stations. hostapd sends 1502 * deauth/disassoc frames when needed. In addition, hostapd is 1503 * responsible for filtering on both auth and assoc states. 1504 */ 1505 1506 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1507 return ieee80211_rx_mesh_check(rx); 1508 1509 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1510 ieee80211_is_pspoll(hdr->frame_control)) && 1511 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1512 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1513 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1514 /* 1515 * accept port control frames from the AP even when it's not 1516 * yet marked ASSOC to prevent a race where we don't set the 1517 * assoc bit quickly enough before it sends the first frame 1518 */ 1519 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1520 ieee80211_is_data_present(hdr->frame_control)) { 1521 unsigned int hdrlen; 1522 __be16 ethertype; 1523 1524 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1525 1526 if (rx->skb->len < hdrlen + 8) 1527 return RX_DROP; 1528 1529 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1530 if (ethertype == rx->sdata->control_port_protocol) 1531 return RX_CONTINUE; 1532 } 1533 1534 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1535 cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1536 rx->link_id, GFP_ATOMIC)) 1537 return RX_DROP_U_SPURIOUS; 1538 1539 return RX_DROP; 1540 } 1541 1542 return RX_CONTINUE; 1543 } 1544 1545 1546 static ieee80211_rx_result debug_noinline 1547 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1548 { 1549 struct ieee80211_local *local; 1550 struct ieee80211_hdr *hdr; 1551 struct sk_buff *skb; 1552 1553 local = rx->local; 1554 skb = rx->skb; 1555 hdr = (struct ieee80211_hdr *) skb->data; 1556 1557 if (!local->pspolling) 1558 return RX_CONTINUE; 1559 1560 if (!ieee80211_has_fromds(hdr->frame_control)) 1561 /* this is not from AP */ 1562 return RX_CONTINUE; 1563 1564 if (!ieee80211_is_data(hdr->frame_control)) 1565 return RX_CONTINUE; 1566 1567 if (!ieee80211_has_moredata(hdr->frame_control)) { 1568 /* AP has no more frames buffered for us */ 1569 local->pspolling = false; 1570 return RX_CONTINUE; 1571 } 1572 1573 /* more data bit is set, let's request a new frame from the AP */ 1574 ieee80211_send_pspoll(local, rx->sdata); 1575 1576 return RX_CONTINUE; 1577 } 1578 1579 static void sta_ps_start(struct sta_info *sta) 1580 { 1581 struct ieee80211_sub_if_data *sdata = sta->sdata; 1582 struct ieee80211_local *local = sdata->local; 1583 struct ps_data *ps; 1584 int tid; 1585 1586 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1587 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1588 ps = &sdata->bss->ps; 1589 else 1590 return; 1591 1592 atomic_inc(&ps->num_sta_ps); 1593 set_sta_flag(sta, WLAN_STA_PS_STA); 1594 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1595 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1596 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1597 sta->sta.addr, sta->sta.aid); 1598 1599 ieee80211_clear_fast_xmit(sta); 1600 1601 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1602 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1603 struct txq_info *txqi = to_txq_info(txq); 1604 1605 spin_lock(&local->active_txq_lock[txq->ac]); 1606 if (!list_empty(&txqi->schedule_order)) 1607 list_del_init(&txqi->schedule_order); 1608 spin_unlock(&local->active_txq_lock[txq->ac]); 1609 1610 if (txq_has_queue(txq)) 1611 set_bit(tid, &sta->txq_buffered_tids); 1612 else 1613 clear_bit(tid, &sta->txq_buffered_tids); 1614 } 1615 } 1616 1617 static void sta_ps_end(struct sta_info *sta) 1618 { 1619 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1620 sta->sta.addr, sta->sta.aid); 1621 1622 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1623 /* 1624 * Clear the flag only if the other one is still set 1625 * so that the TX path won't start TX'ing new frames 1626 * directly ... In the case that the driver flag isn't 1627 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1628 */ 1629 clear_sta_flag(sta, WLAN_STA_PS_STA); 1630 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1631 sta->sta.addr, sta->sta.aid); 1632 return; 1633 } 1634 1635 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1636 clear_sta_flag(sta, WLAN_STA_PS_STA); 1637 ieee80211_sta_ps_deliver_wakeup(sta); 1638 } 1639 1640 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1641 { 1642 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1643 bool in_ps; 1644 1645 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1646 1647 /* Don't let the same PS state be set twice */ 1648 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1649 if ((start && in_ps) || (!start && !in_ps)) 1650 return -EINVAL; 1651 1652 if (start) 1653 sta_ps_start(sta); 1654 else 1655 sta_ps_end(sta); 1656 1657 return 0; 1658 } 1659 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1660 1661 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1662 { 1663 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1664 1665 if (test_sta_flag(sta, WLAN_STA_SP)) 1666 return; 1667 1668 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1669 ieee80211_sta_ps_deliver_poll_response(sta); 1670 else 1671 set_sta_flag(sta, WLAN_STA_PSPOLL); 1672 } 1673 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1674 1675 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1676 { 1677 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1678 int ac = ieee80211_ac_from_tid(tid); 1679 1680 /* 1681 * If this AC is not trigger-enabled do nothing unless the 1682 * driver is calling us after it already checked. 1683 * 1684 * NB: This could/should check a separate bitmap of trigger- 1685 * enabled queues, but for now we only implement uAPSD w/o 1686 * TSPEC changes to the ACs, so they're always the same. 1687 */ 1688 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1689 tid != IEEE80211_NUM_TIDS) 1690 return; 1691 1692 /* if we are in a service period, do nothing */ 1693 if (test_sta_flag(sta, WLAN_STA_SP)) 1694 return; 1695 1696 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1697 ieee80211_sta_ps_deliver_uapsd(sta); 1698 else 1699 set_sta_flag(sta, WLAN_STA_UAPSD); 1700 } 1701 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1702 1703 static ieee80211_rx_result debug_noinline 1704 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1705 { 1706 struct ieee80211_sub_if_data *sdata = rx->sdata; 1707 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1708 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1709 1710 if (!rx->sta) 1711 return RX_CONTINUE; 1712 1713 if (sdata->vif.type != NL80211_IFTYPE_AP && 1714 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1715 return RX_CONTINUE; 1716 1717 /* 1718 * The device handles station powersave, so don't do anything about 1719 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1720 * it to mac80211 since they're handled.) 1721 */ 1722 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1723 return RX_CONTINUE; 1724 1725 /* 1726 * Don't do anything if the station isn't already asleep. In 1727 * the uAPSD case, the station will probably be marked asleep, 1728 * in the PS-Poll case the station must be confused ... 1729 */ 1730 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1731 return RX_CONTINUE; 1732 1733 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1734 ieee80211_sta_pspoll(&rx->sta->sta); 1735 1736 /* Free PS Poll skb here instead of returning RX_DROP that would 1737 * count as an dropped frame. */ 1738 dev_kfree_skb(rx->skb); 1739 1740 return RX_QUEUED; 1741 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1742 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1743 ieee80211_has_pm(hdr->frame_control) && 1744 (ieee80211_is_data_qos(hdr->frame_control) || 1745 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1746 u8 tid = ieee80211_get_tid(hdr); 1747 1748 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1749 } 1750 1751 return RX_CONTINUE; 1752 } 1753 1754 static ieee80211_rx_result debug_noinline 1755 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1756 { 1757 struct sta_info *sta = rx->sta; 1758 struct link_sta_info *link_sta = rx->link_sta; 1759 struct sk_buff *skb = rx->skb; 1760 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1761 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1762 int i; 1763 1764 if (!sta || !link_sta) 1765 return RX_CONTINUE; 1766 1767 /* 1768 * Update last_rx only for IBSS packets which are for the current 1769 * BSSID and for station already AUTHORIZED to avoid keeping the 1770 * current IBSS network alive in cases where other STAs start 1771 * using different BSSID. This will also give the station another 1772 * chance to restart the authentication/authorization in case 1773 * something went wrong the first time. 1774 */ 1775 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1776 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1777 NL80211_IFTYPE_ADHOC); 1778 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1779 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1780 link_sta->rx_stats.last_rx = jiffies; 1781 if (ieee80211_is_data_present(hdr->frame_control) && 1782 !is_multicast_ether_addr(hdr->addr1)) 1783 link_sta->rx_stats.last_rate = 1784 sta_stats_encode_rate(status); 1785 } 1786 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1787 link_sta->rx_stats.last_rx = jiffies; 1788 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1789 !is_multicast_ether_addr(hdr->addr1)) { 1790 /* 1791 * Mesh beacons will update last_rx when if they are found to 1792 * match the current local configuration when processed. 1793 */ 1794 link_sta->rx_stats.last_rx = jiffies; 1795 if (ieee80211_is_data_present(hdr->frame_control)) 1796 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1797 } 1798 1799 link_sta->rx_stats.fragments++; 1800 1801 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1802 link_sta->rx_stats.bytes += rx->skb->len; 1803 u64_stats_update_end(&link_sta->rx_stats.syncp); 1804 1805 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1806 link_sta->rx_stats.last_signal = status->signal; 1807 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1808 -status->signal); 1809 } 1810 1811 if (status->chains) { 1812 link_sta->rx_stats.chains = status->chains; 1813 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1814 int signal = status->chain_signal[i]; 1815 1816 if (!(status->chains & BIT(i))) 1817 continue; 1818 1819 link_sta->rx_stats.chain_signal_last[i] = signal; 1820 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1821 -signal); 1822 } 1823 } 1824 1825 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1826 return RX_CONTINUE; 1827 1828 /* 1829 * Change STA power saving mode only at the end of a frame 1830 * exchange sequence, and only for a data or management 1831 * frame as specified in IEEE 802.11-2016 11.2.3.2 1832 */ 1833 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1834 !ieee80211_has_morefrags(hdr->frame_control) && 1835 !is_multicast_ether_addr(hdr->addr1) && 1836 (ieee80211_is_mgmt(hdr->frame_control) || 1837 ieee80211_is_data(hdr->frame_control)) && 1838 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1839 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1841 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1842 if (!ieee80211_has_pm(hdr->frame_control)) 1843 sta_ps_end(sta); 1844 } else { 1845 if (ieee80211_has_pm(hdr->frame_control)) 1846 sta_ps_start(sta); 1847 } 1848 } 1849 1850 /* mesh power save support */ 1851 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1852 ieee80211_mps_rx_h_sta_process(sta, hdr); 1853 1854 /* 1855 * Drop (qos-)data::nullfunc frames silently, since they 1856 * are used only to control station power saving mode. 1857 */ 1858 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1859 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1860 1861 /* 1862 * If we receive a 4-addr nullfunc frame from a STA 1863 * that was not moved to a 4-addr STA vlan yet send 1864 * the event to userspace and for older hostapd drop 1865 * the frame to the monitor interface. 1866 */ 1867 if (ieee80211_has_a4(hdr->frame_control) && 1868 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1869 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1870 !rx->sdata->u.vlan.sta))) { 1871 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1872 cfg80211_rx_unexpected_4addr_frame( 1873 rx->sdata->dev, sta->sta.addr, 1874 rx->link_id, GFP_ATOMIC); 1875 return RX_DROP_U_UNEXPECTED_4ADDR_FRAME; 1876 } 1877 /* 1878 * Update counter and free packet here to avoid 1879 * counting this as a dropped packed. 1880 */ 1881 link_sta->rx_stats.packets++; 1882 dev_kfree_skb(rx->skb); 1883 return RX_QUEUED; 1884 } 1885 1886 return RX_CONTINUE; 1887 } /* ieee80211_rx_h_sta_process */ 1888 1889 static struct ieee80211_key * 1890 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1891 { 1892 struct ieee80211_key *key = NULL; 1893 int idx2; 1894 1895 /* Make sure key gets set if either BIGTK key index is set so that 1896 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1897 * Beacon frames and Beacon frames that claim to use another BIGTK key 1898 * index (i.e., a key that we do not have). 1899 */ 1900 1901 if (idx < 0) { 1902 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 1903 idx2 = idx + 1; 1904 } else { 1905 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1906 idx2 = idx + 1; 1907 else 1908 idx2 = idx - 1; 1909 } 1910 1911 if (rx->link_sta) 1912 key = rcu_dereference(rx->link_sta->gtk[idx]); 1913 if (!key) 1914 key = rcu_dereference(rx->link->gtk[idx]); 1915 if (!key && rx->link_sta) 1916 key = rcu_dereference(rx->link_sta->gtk[idx2]); 1917 if (!key) 1918 key = rcu_dereference(rx->link->gtk[idx2]); 1919 1920 return key; 1921 } 1922 1923 static ieee80211_rx_result debug_noinline 1924 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1925 { 1926 struct sk_buff *skb = rx->skb; 1927 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1928 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1929 int keyidx; 1930 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 1931 struct ieee80211_key *sta_ptk = NULL; 1932 struct ieee80211_key *ptk_idx = NULL; 1933 int mmie_keyidx = -1; 1934 __le16 fc; 1935 1936 if (ieee80211_is_ext(hdr->frame_control)) 1937 return RX_CONTINUE; 1938 1939 /* 1940 * Key selection 101 1941 * 1942 * There are five types of keys: 1943 * - GTK (group keys) 1944 * - IGTK (group keys for management frames) 1945 * - BIGTK (group keys for Beacon frames) 1946 * - PTK (pairwise keys) 1947 * - STK (station-to-station pairwise keys) 1948 * 1949 * When selecting a key, we have to distinguish between multicast 1950 * (including broadcast) and unicast frames, the latter can only 1951 * use PTKs and STKs while the former always use GTKs, IGTKs, and 1952 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 1953 * then unicast frames can also use key indices like GTKs. Hence, if we 1954 * don't have a PTK/STK we check the key index for a WEP key. 1955 * 1956 * Note that in a regular BSS, multicast frames are sent by the 1957 * AP only, associated stations unicast the frame to the AP first 1958 * which then multicasts it on their behalf. 1959 * 1960 * There is also a slight problem in IBSS mode: GTKs are negotiated 1961 * with each station, that is something we don't currently handle. 1962 * The spec seems to expect that one negotiates the same key with 1963 * every station but there's no such requirement; VLANs could be 1964 * possible. 1965 */ 1966 1967 /* start without a key */ 1968 rx->key = NULL; 1969 fc = hdr->frame_control; 1970 1971 if (rx->sta) { 1972 int keyid = rx->sta->ptk_idx; 1973 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1974 1975 if (ieee80211_has_protected(fc) && 1976 !(status->flag & RX_FLAG_IV_STRIPPED)) { 1977 keyid = ieee80211_get_keyid(rx->skb); 1978 1979 if (unlikely(keyid < 0)) 1980 return RX_DROP_U_NO_KEY_ID; 1981 1982 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 1983 } 1984 } 1985 1986 if (!ieee80211_has_protected(fc)) 1987 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1988 1989 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1990 rx->key = ptk_idx ? ptk_idx : sta_ptk; 1991 if ((status->flag & RX_FLAG_DECRYPTED) && 1992 (status->flag & RX_FLAG_IV_STRIPPED)) 1993 return RX_CONTINUE; 1994 /* Skip decryption if the frame is not protected. */ 1995 if (!ieee80211_has_protected(fc)) 1996 return RX_CONTINUE; 1997 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 1998 /* Broadcast/multicast robust management frame / BIP */ 1999 if ((status->flag & RX_FLAG_DECRYPTED) && 2000 (status->flag & RX_FLAG_IV_STRIPPED)) 2001 return RX_CONTINUE; 2002 2003 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 2004 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 2005 NUM_DEFAULT_BEACON_KEYS) { 2006 if (rx->sdata->dev) 2007 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2008 skb->data, 2009 skb->len); 2010 return RX_DROP_U_BAD_BCN_KEYIDX; 2011 } 2012 2013 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2014 if (!rx->key) 2015 return RX_CONTINUE; /* Beacon protection not in use */ 2016 } else if (mmie_keyidx >= 0) { 2017 /* Broadcast/multicast robust management frame / BIP */ 2018 if ((status->flag & RX_FLAG_DECRYPTED) && 2019 (status->flag & RX_FLAG_IV_STRIPPED)) 2020 return RX_CONTINUE; 2021 2022 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2023 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2024 return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2025 if (rx->link_sta) { 2026 if (ieee80211_is_group_privacy_action(skb) && 2027 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2028 return RX_DROP; 2029 2030 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2031 } 2032 if (!rx->key) 2033 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2034 } else if (!ieee80211_has_protected(fc)) { 2035 /* 2036 * The frame was not protected, so skip decryption. However, we 2037 * need to set rx->key if there is a key that could have been 2038 * used so that the frame may be dropped if encryption would 2039 * have been expected. 2040 */ 2041 struct ieee80211_key *key = NULL; 2042 int i; 2043 2044 if (ieee80211_is_beacon(fc)) { 2045 key = ieee80211_rx_get_bigtk(rx, -1); 2046 } else if (ieee80211_is_mgmt(fc) && 2047 is_multicast_ether_addr(hdr->addr1)) { 2048 key = rcu_dereference(rx->link->default_mgmt_key); 2049 } else { 2050 if (rx->link_sta) { 2051 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2052 key = rcu_dereference(rx->link_sta->gtk[i]); 2053 if (key) 2054 break; 2055 } 2056 } 2057 if (!key) { 2058 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2059 key = rcu_dereference(rx->link->gtk[i]); 2060 if (key) 2061 break; 2062 } 2063 } 2064 } 2065 if (key) 2066 rx->key = key; 2067 return RX_CONTINUE; 2068 } else { 2069 /* 2070 * The device doesn't give us the IV so we won't be 2071 * able to look up the key. That's ok though, we 2072 * don't need to decrypt the frame, we just won't 2073 * be able to keep statistics accurate. 2074 * Except for key threshold notifications, should 2075 * we somehow allow the driver to tell us which key 2076 * the hardware used if this flag is set? 2077 */ 2078 if ((status->flag & RX_FLAG_DECRYPTED) && 2079 (status->flag & RX_FLAG_IV_STRIPPED)) 2080 return RX_CONTINUE; 2081 2082 keyidx = ieee80211_get_keyid(rx->skb); 2083 2084 if (unlikely(keyidx < 0)) 2085 return RX_DROP_U_NO_KEY_ID; 2086 2087 /* check per-station GTK first, if multicast packet */ 2088 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2089 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2090 2091 /* if not found, try default key */ 2092 if (!rx->key) { 2093 if (is_multicast_ether_addr(hdr->addr1)) 2094 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2095 if (!rx->key) 2096 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2097 2098 /* 2099 * RSNA-protected unicast frames should always be 2100 * sent with pairwise or station-to-station keys, 2101 * but for WEP we allow using a key index as well. 2102 */ 2103 if (rx->key && 2104 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2105 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2106 !is_multicast_ether_addr(hdr->addr1)) 2107 rx->key = NULL; 2108 } 2109 } 2110 2111 if (rx->key) { 2112 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2113 return RX_DROP; 2114 2115 /* TODO: add threshold stuff again */ 2116 } else { 2117 return RX_DROP; 2118 } 2119 2120 switch (rx->key->conf.cipher) { 2121 case WLAN_CIPHER_SUITE_WEP40: 2122 case WLAN_CIPHER_SUITE_WEP104: 2123 result = ieee80211_crypto_wep_decrypt(rx); 2124 break; 2125 case WLAN_CIPHER_SUITE_TKIP: 2126 result = ieee80211_crypto_tkip_decrypt(rx); 2127 break; 2128 case WLAN_CIPHER_SUITE_CCMP: 2129 result = ieee80211_crypto_ccmp_decrypt( 2130 rx, IEEE80211_CCMP_MIC_LEN); 2131 break; 2132 case WLAN_CIPHER_SUITE_CCMP_256: 2133 result = ieee80211_crypto_ccmp_decrypt( 2134 rx, IEEE80211_CCMP_256_MIC_LEN); 2135 break; 2136 case WLAN_CIPHER_SUITE_AES_CMAC: 2137 result = ieee80211_crypto_aes_cmac_decrypt(rx); 2138 break; 2139 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2140 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 2141 break; 2142 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2143 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2144 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2145 break; 2146 case WLAN_CIPHER_SUITE_GCMP: 2147 case WLAN_CIPHER_SUITE_GCMP_256: 2148 result = ieee80211_crypto_gcmp_decrypt(rx); 2149 break; 2150 default: 2151 result = RX_DROP_U_BAD_CIPHER; 2152 } 2153 2154 /* the hdr variable is invalid after the decrypt handlers */ 2155 2156 /* either the frame has been decrypted or will be dropped */ 2157 status->flag |= RX_FLAG_DECRYPTED; 2158 2159 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2160 rx->sdata->dev)) 2161 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2162 skb->data, skb->len); 2163 2164 return result; 2165 } 2166 2167 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2168 { 2169 int i; 2170 2171 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2172 skb_queue_head_init(&cache->entries[i].skb_list); 2173 } 2174 2175 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2176 { 2177 int i; 2178 2179 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2180 __skb_queue_purge(&cache->entries[i].skb_list); 2181 } 2182 2183 static inline struct ieee80211_fragment_entry * 2184 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2185 unsigned int frag, unsigned int seq, int rx_queue, 2186 struct sk_buff **skb) 2187 { 2188 struct ieee80211_fragment_entry *entry; 2189 2190 entry = &cache->entries[cache->next++]; 2191 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2192 cache->next = 0; 2193 2194 __skb_queue_purge(&entry->skb_list); 2195 2196 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2197 *skb = NULL; 2198 entry->first_frag_time = jiffies; 2199 entry->seq = seq; 2200 entry->rx_queue = rx_queue; 2201 entry->last_frag = frag; 2202 entry->check_sequential_pn = false; 2203 entry->extra_len = 0; 2204 2205 return entry; 2206 } 2207 2208 static inline struct ieee80211_fragment_entry * 2209 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2210 unsigned int frag, unsigned int seq, 2211 int rx_queue, struct ieee80211_hdr *hdr) 2212 { 2213 struct ieee80211_fragment_entry *entry; 2214 int i, idx; 2215 2216 idx = cache->next; 2217 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2218 struct ieee80211_hdr *f_hdr; 2219 struct sk_buff *f_skb; 2220 2221 idx--; 2222 if (idx < 0) 2223 idx = IEEE80211_FRAGMENT_MAX - 1; 2224 2225 entry = &cache->entries[idx]; 2226 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2227 entry->rx_queue != rx_queue || 2228 entry->last_frag + 1 != frag) 2229 continue; 2230 2231 f_skb = __skb_peek(&entry->skb_list); 2232 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2233 2234 /* 2235 * Check ftype and addresses are equal, else check next fragment 2236 */ 2237 if (((hdr->frame_control ^ f_hdr->frame_control) & 2238 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2239 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2240 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2241 continue; 2242 2243 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2244 __skb_queue_purge(&entry->skb_list); 2245 continue; 2246 } 2247 return entry; 2248 } 2249 2250 return NULL; 2251 } 2252 2253 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2254 { 2255 return rx->key && 2256 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2257 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2258 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2259 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2260 ieee80211_has_protected(fc); 2261 } 2262 2263 static ieee80211_rx_result debug_noinline 2264 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2265 { 2266 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2267 struct ieee80211_hdr *hdr; 2268 u16 sc; 2269 __le16 fc; 2270 unsigned int frag, seq; 2271 struct ieee80211_fragment_entry *entry; 2272 struct sk_buff *skb; 2273 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2274 2275 hdr = (struct ieee80211_hdr *)rx->skb->data; 2276 fc = hdr->frame_control; 2277 2278 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2279 return RX_CONTINUE; 2280 2281 sc = le16_to_cpu(hdr->seq_ctrl); 2282 frag = sc & IEEE80211_SCTL_FRAG; 2283 2284 if (rx->sta) 2285 cache = &rx->sta->frags; 2286 2287 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2288 goto out; 2289 2290 if (is_multicast_ether_addr(hdr->addr1)) 2291 return RX_DROP; 2292 2293 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2294 2295 if (skb_linearize(rx->skb)) 2296 return RX_DROP_U_OOM; 2297 2298 /* 2299 * skb_linearize() might change the skb->data and 2300 * previously cached variables (in this case, hdr) need to 2301 * be refreshed with the new data. 2302 */ 2303 hdr = (struct ieee80211_hdr *)rx->skb->data; 2304 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2305 2306 if (frag == 0) { 2307 /* This is the first fragment of a new frame. */ 2308 entry = ieee80211_reassemble_add(cache, frag, seq, 2309 rx->seqno_idx, &(rx->skb)); 2310 if (requires_sequential_pn(rx, fc)) { 2311 int queue = rx->security_idx; 2312 2313 /* Store CCMP/GCMP PN so that we can verify that the 2314 * next fragment has a sequential PN value. 2315 */ 2316 entry->check_sequential_pn = true; 2317 entry->is_protected = true; 2318 entry->key_color = rx->key->color; 2319 memcpy(entry->last_pn, 2320 rx->key->u.ccmp.rx_pn[queue], 2321 IEEE80211_CCMP_PN_LEN); 2322 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2323 u.ccmp.rx_pn) != 2324 offsetof(struct ieee80211_key, 2325 u.gcmp.rx_pn)); 2326 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2327 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2328 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2329 IEEE80211_GCMP_PN_LEN); 2330 } else if (rx->key && 2331 (ieee80211_has_protected(fc) || 2332 (status->flag & RX_FLAG_DECRYPTED))) { 2333 entry->is_protected = true; 2334 entry->key_color = rx->key->color; 2335 } 2336 return RX_QUEUED; 2337 } 2338 2339 /* This is a fragment for a frame that should already be pending in 2340 * fragment cache. Add this fragment to the end of the pending entry. 2341 */ 2342 entry = ieee80211_reassemble_find(cache, frag, seq, 2343 rx->seqno_idx, hdr); 2344 if (!entry) { 2345 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2346 return RX_DROP; 2347 } 2348 2349 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2350 * MPDU PN values are not incrementing in steps of 1." 2351 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2352 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2353 */ 2354 if (entry->check_sequential_pn) { 2355 int i; 2356 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2357 2358 if (!requires_sequential_pn(rx, fc)) 2359 return RX_DROP_U_NONSEQ_PN; 2360 2361 /* Prevent mixed key and fragment cache attacks */ 2362 if (entry->key_color != rx->key->color) 2363 return RX_DROP_U_BAD_KEY_COLOR; 2364 2365 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2366 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2367 pn[i]++; 2368 if (pn[i]) 2369 break; 2370 } 2371 2372 rpn = rx->ccm_gcm.pn; 2373 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2374 return RX_DROP_U_REPLAY; 2375 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2376 } else if (entry->is_protected && 2377 (!rx->key || 2378 (!ieee80211_has_protected(fc) && 2379 !(status->flag & RX_FLAG_DECRYPTED)) || 2380 rx->key->color != entry->key_color)) { 2381 /* Drop this as a mixed key or fragment cache attack, even 2382 * if for TKIP Michael MIC should protect us, and WEP is a 2383 * lost cause anyway. 2384 */ 2385 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2386 } else if (entry->is_protected && rx->key && 2387 entry->key_color != rx->key->color && 2388 (status->flag & RX_FLAG_DECRYPTED)) { 2389 return RX_DROP_U_BAD_KEY_COLOR; 2390 } 2391 2392 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2393 __skb_queue_tail(&entry->skb_list, rx->skb); 2394 entry->last_frag = frag; 2395 entry->extra_len += rx->skb->len; 2396 if (ieee80211_has_morefrags(fc)) { 2397 rx->skb = NULL; 2398 return RX_QUEUED; 2399 } 2400 2401 rx->skb = __skb_dequeue(&entry->skb_list); 2402 if (skb_tailroom(rx->skb) < entry->extra_len) { 2403 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2404 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2405 GFP_ATOMIC))) { 2406 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2407 __skb_queue_purge(&entry->skb_list); 2408 return RX_DROP_U_OOM; 2409 } 2410 } 2411 while ((skb = __skb_dequeue(&entry->skb_list))) { 2412 skb_put_data(rx->skb, skb->data, skb->len); 2413 dev_kfree_skb(skb); 2414 } 2415 2416 out: 2417 ieee80211_led_rx(rx->local); 2418 if (rx->sta) 2419 rx->link_sta->rx_stats.packets++; 2420 return RX_CONTINUE; 2421 } 2422 2423 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2424 { 2425 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2426 return -EACCES; 2427 2428 return 0; 2429 } 2430 2431 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2432 { 2433 struct sk_buff *skb = rx->skb; 2434 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2435 2436 /* 2437 * Pass through unencrypted frames if the hardware has 2438 * decrypted them already. 2439 */ 2440 if (status->flag & RX_FLAG_DECRYPTED) 2441 return 0; 2442 2443 /* Drop unencrypted frames if key is set. */ 2444 if (unlikely(!ieee80211_has_protected(fc) && 2445 !ieee80211_is_any_nullfunc(fc) && 2446 ieee80211_is_data(fc) && rx->key)) 2447 return -EACCES; 2448 2449 return 0; 2450 } 2451 2452 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2453 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2454 { 2455 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2456 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2457 __le16 fc = mgmt->frame_control; 2458 2459 /* 2460 * Pass through unencrypted frames if the hardware has 2461 * decrypted them already. 2462 */ 2463 if (status->flag & RX_FLAG_DECRYPTED) 2464 return RX_CONTINUE; 2465 2466 /* drop unicast protected dual (that wasn't protected) */ 2467 if (ieee80211_is_action(fc) && 2468 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2469 return RX_DROP_U_UNPROT_DUAL; 2470 2471 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2472 if (unlikely(!ieee80211_has_protected(fc) && 2473 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2474 if (ieee80211_is_deauth(fc) || 2475 ieee80211_is_disassoc(fc)) { 2476 /* 2477 * Permit unprotected deauth/disassoc frames 2478 * during 4-way-HS (key is installed after HS). 2479 */ 2480 if (!rx->key) 2481 return RX_CONTINUE; 2482 2483 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2484 rx->skb->data, 2485 rx->skb->len); 2486 } 2487 return RX_DROP_U_UNPROT_UCAST_MGMT; 2488 } 2489 /* BIP does not use Protected field, so need to check MMIE */ 2490 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2491 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2492 if (ieee80211_is_deauth(fc) || 2493 ieee80211_is_disassoc(fc)) 2494 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2495 rx->skb->data, 2496 rx->skb->len); 2497 return RX_DROP_U_UNPROT_MCAST_MGMT; 2498 } 2499 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2500 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2501 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2502 rx->skb->data, 2503 rx->skb->len); 2504 return RX_DROP_U_UNPROT_BEACON; 2505 } 2506 /* 2507 * When using MFP, Action frames are not allowed prior to 2508 * having configured keys. 2509 */ 2510 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2511 ieee80211_is_robust_mgmt_frame(rx->skb))) 2512 return RX_DROP_U_UNPROT_ACTION; 2513 2514 /* drop unicast public action frames when using MPF */ 2515 if (is_unicast_ether_addr(mgmt->da) && 2516 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2517 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2518 } 2519 2520 /* 2521 * Drop robust action frames before assoc regardless of MFP state, 2522 * after assoc we also have decided on MFP or not. 2523 */ 2524 if (ieee80211_is_action(fc) && 2525 ieee80211_is_robust_mgmt_frame(rx->skb) && 2526 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2527 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2528 2529 return RX_CONTINUE; 2530 } 2531 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2532 2533 static ieee80211_rx_result 2534 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2535 { 2536 struct ieee80211_sub_if_data *sdata = rx->sdata; 2537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2538 bool check_port_control = false; 2539 struct ethhdr *ehdr; 2540 int ret; 2541 2542 *port_control = false; 2543 if (ieee80211_has_a4(hdr->frame_control) && 2544 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2545 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2546 2547 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2548 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2549 if (!sdata->u.mgd.use_4addr) 2550 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2551 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2552 check_port_control = true; 2553 } 2554 2555 if (is_multicast_ether_addr(hdr->addr1) && 2556 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2557 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2558 2559 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2560 if (ret < 0) 2561 return RX_DROP_U_INVALID_8023; 2562 2563 ehdr = (struct ethhdr *) rx->skb->data; 2564 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2565 *port_control = true; 2566 else if (check_port_control) 2567 return RX_DROP_U_NOT_PORT_CONTROL; 2568 2569 return RX_CONTINUE; 2570 } 2571 2572 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2573 const u8 *addr, int *out_link_id) 2574 { 2575 unsigned int link_id; 2576 2577 /* non-MLO, or MLD address replaced by hardware */ 2578 if (ether_addr_equal(sdata->vif.addr, addr)) 2579 return true; 2580 2581 if (!ieee80211_vif_is_mld(&sdata->vif)) 2582 return false; 2583 2584 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2585 struct ieee80211_bss_conf *conf; 2586 2587 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2588 2589 if (!conf) 2590 continue; 2591 if (ether_addr_equal(conf->addr, addr)) { 2592 if (out_link_id) 2593 *out_link_id = link_id; 2594 return true; 2595 } 2596 } 2597 2598 return false; 2599 } 2600 2601 /* 2602 * requires that rx->skb is a frame with ethernet header 2603 */ 2604 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2605 { 2606 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2607 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2608 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2609 2610 /* 2611 * Allow EAPOL frames to us/the PAE group address regardless of 2612 * whether the frame was encrypted or not, and always disallow 2613 * all other destination addresses for them. 2614 */ 2615 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2616 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2617 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2618 2619 if (ieee80211_802_1x_port_control(rx) || 2620 ieee80211_drop_unencrypted(rx, fc)) 2621 return false; 2622 2623 return true; 2624 } 2625 2626 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2627 struct ieee80211_rx_data *rx) 2628 { 2629 struct ieee80211_sub_if_data *sdata = rx->sdata; 2630 struct net_device *dev = sdata->dev; 2631 2632 if (unlikely((skb->protocol == sdata->control_port_protocol || 2633 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2634 !sdata->control_port_no_preauth)) && 2635 sdata->control_port_over_nl80211)) { 2636 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2637 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2638 2639 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2640 dev_kfree_skb(skb); 2641 } else { 2642 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2643 2644 memset(skb->cb, 0, sizeof(skb->cb)); 2645 2646 /* 2647 * 802.1X over 802.11 requires that the authenticator address 2648 * be used for EAPOL frames. However, 802.1X allows the use of 2649 * the PAE group address instead. If the interface is part of 2650 * a bridge and we pass the frame with the PAE group address, 2651 * then the bridge will forward it to the network (even if the 2652 * client was not associated yet), which isn't supposed to 2653 * happen. 2654 * To avoid that, rewrite the destination address to our own 2655 * address, so that the authenticator (e.g. hostapd) will see 2656 * the frame, but bridge won't forward it anywhere else. Note 2657 * that due to earlier filtering, the only other address can 2658 * be the PAE group address, unless the hardware allowed them 2659 * through in 802.3 offloaded mode. 2660 */ 2661 if (unlikely(skb->protocol == sdata->control_port_protocol && 2662 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2663 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2664 2665 /* deliver to local stack */ 2666 if (rx->list) 2667 list_add_tail(&skb->list, rx->list); 2668 else 2669 netif_receive_skb(skb); 2670 } 2671 } 2672 2673 /* 2674 * requires that rx->skb is a frame with ethernet header 2675 */ 2676 static void 2677 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2678 { 2679 struct ieee80211_sub_if_data *sdata = rx->sdata; 2680 struct net_device *dev = sdata->dev; 2681 struct sk_buff *skb, *xmit_skb; 2682 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2683 struct sta_info *dsta; 2684 2685 skb = rx->skb; 2686 xmit_skb = NULL; 2687 2688 dev_sw_netstats_rx_add(dev, skb->len); 2689 2690 if (rx->sta) { 2691 /* The seqno index has the same property as needed 2692 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2693 * for non-QoS-data frames. Here we know it's a data 2694 * frame, so count MSDUs. 2695 */ 2696 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2697 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++; 2698 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2699 } 2700 2701 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2702 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2703 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2704 ehdr->h_proto != rx->sdata->control_port_protocol && 2705 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2706 if (is_multicast_ether_addr(ehdr->h_dest) && 2707 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2708 /* 2709 * send multicast frames both to higher layers in 2710 * local net stack and back to the wireless medium 2711 */ 2712 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2713 if (!xmit_skb) 2714 net_info_ratelimited("%s: failed to clone multicast frame\n", 2715 dev->name); 2716 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2717 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2718 dsta = sta_info_get(sdata, ehdr->h_dest); 2719 if (dsta) { 2720 /* 2721 * The destination station is associated to 2722 * this AP (in this VLAN), so send the frame 2723 * directly to it and do not pass it to local 2724 * net stack. 2725 */ 2726 xmit_skb = skb; 2727 skb = NULL; 2728 } 2729 } 2730 } 2731 2732 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2733 if (skb) { 2734 /* 'align' will only take the values 0 or 2 here since all 2735 * frames are required to be aligned to 2-byte boundaries 2736 * when being passed to mac80211; the code here works just 2737 * as well if that isn't true, but mac80211 assumes it can 2738 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2739 */ 2740 int align; 2741 2742 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2743 if (align) { 2744 if (WARN_ON(skb_headroom(skb) < 3)) { 2745 dev_kfree_skb(skb); 2746 skb = NULL; 2747 } else { 2748 u8 *data = skb->data; 2749 size_t len = skb_headlen(skb); 2750 skb->data -= align; 2751 memmove(skb->data, data, len); 2752 skb_set_tail_pointer(skb, len); 2753 } 2754 } 2755 } 2756 #endif 2757 2758 if (skb) { 2759 skb->protocol = eth_type_trans(skb, dev); 2760 ieee80211_deliver_skb_to_local_stack(skb, rx); 2761 } 2762 2763 if (xmit_skb) { 2764 /* 2765 * Send to wireless media and increase priority by 256 to 2766 * keep the received priority instead of reclassifying 2767 * the frame (see cfg80211_classify8021d). 2768 */ 2769 xmit_skb->priority += 256; 2770 xmit_skb->protocol = htons(ETH_P_802_3); 2771 skb_reset_network_header(xmit_skb); 2772 skb_reset_mac_header(xmit_skb); 2773 dev_queue_xmit(xmit_skb); 2774 } 2775 } 2776 2777 #ifdef CONFIG_MAC80211_MESH 2778 static bool 2779 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2780 struct sk_buff *skb, int hdrlen) 2781 { 2782 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2783 struct ieee80211_mesh_fast_tx_key key = { 2784 .type = MESH_FAST_TX_TYPE_FORWARDED 2785 }; 2786 struct ieee80211_mesh_fast_tx *entry; 2787 struct ieee80211s_hdr *mesh_hdr; 2788 struct tid_ampdu_tx *tid_tx; 2789 struct sta_info *sta; 2790 struct ethhdr eth; 2791 u8 tid; 2792 2793 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2794 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2795 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2796 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2797 ether_addr_copy(key.addr, skb->data); 2798 else 2799 return false; 2800 2801 entry = mesh_fast_tx_get(sdata, &key); 2802 if (!entry) 2803 return false; 2804 2805 sta = rcu_dereference(entry->mpath->next_hop); 2806 if (!sta) 2807 return false; 2808 2809 if (skb_linearize(skb)) 2810 return false; 2811 2812 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2813 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2814 if (tid_tx) { 2815 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2816 return false; 2817 2818 if (tid_tx->timeout) 2819 tid_tx->last_tx = jiffies; 2820 } 2821 2822 ieee80211_aggr_check(sdata, sta, skb); 2823 2824 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2825 &skb->protocol)) 2826 hdrlen += ETH_ALEN; 2827 else 2828 skb->protocol = htons(skb->len - hdrlen); 2829 skb_set_network_header(skb, hdrlen + 2); 2830 2831 skb->dev = sdata->dev; 2832 memcpy(ð, skb->data, ETH_HLEN - 2); 2833 skb_pull(skb, 2); 2834 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2835 eth.h_dest, eth.h_source); 2836 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2837 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2838 2839 return true; 2840 } 2841 #endif 2842 2843 static ieee80211_rx_result 2844 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2845 struct sk_buff *skb) 2846 { 2847 #ifdef CONFIG_MAC80211_MESH 2848 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2849 struct ieee80211_local *local = sdata->local; 2850 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2851 struct ieee80211_hdr hdr = { 2852 .frame_control = cpu_to_le16(fc) 2853 }; 2854 struct ieee80211_hdr *fwd_hdr; 2855 struct ieee80211s_hdr *mesh_hdr; 2856 struct ieee80211_tx_info *info; 2857 struct sk_buff *fwd_skb; 2858 struct ethhdr *eth; 2859 bool multicast; 2860 int tailroom = 0; 2861 int hdrlen, mesh_hdrlen; 2862 u8 *qos; 2863 2864 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2865 return RX_CONTINUE; 2866 2867 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2868 return RX_DROP; 2869 2870 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2871 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2872 2873 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2874 return RX_DROP; 2875 2876 eth = (struct ethhdr *)skb->data; 2877 multicast = is_multicast_ether_addr(eth->h_dest); 2878 2879 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2880 if (!mesh_hdr->ttl) 2881 return RX_DROP; 2882 2883 /* frame is in RMC, don't forward */ 2884 if (is_multicast_ether_addr(eth->h_dest) && 2885 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 2886 return RX_DROP; 2887 2888 /* forward packet */ 2889 if (sdata->crypto_tx_tailroom_needed_cnt) 2890 tailroom = IEEE80211_ENCRYPT_TAILROOM; 2891 2892 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2893 struct mesh_path *mppath; 2894 char *proxied_addr; 2895 bool update = false; 2896 2897 if (multicast) 2898 proxied_addr = mesh_hdr->eaddr1; 2899 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2900 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2901 proxied_addr = mesh_hdr->eaddr2; 2902 else 2903 return RX_DROP; 2904 2905 rcu_read_lock(); 2906 mppath = mpp_path_lookup(sdata, proxied_addr); 2907 if (!mppath) { 2908 mpp_path_add(sdata, proxied_addr, eth->h_source); 2909 } else { 2910 spin_lock_bh(&mppath->state_lock); 2911 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 2912 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 2913 update = true; 2914 } 2915 mppath->exp_time = jiffies; 2916 spin_unlock_bh(&mppath->state_lock); 2917 } 2918 2919 /* flush fast xmit cache if the address path changed */ 2920 if (update) 2921 mesh_fast_tx_flush_addr(sdata, proxied_addr); 2922 2923 rcu_read_unlock(); 2924 } 2925 2926 /* Frame has reached destination. Don't forward */ 2927 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 2928 goto rx_accept; 2929 2930 if (!--mesh_hdr->ttl) { 2931 if (multicast) 2932 goto rx_accept; 2933 2934 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2935 return RX_DROP; 2936 } 2937 2938 if (!ifmsh->mshcfg.dot11MeshForwarding) { 2939 if (is_multicast_ether_addr(eth->h_dest)) 2940 goto rx_accept; 2941 2942 return RX_DROP; 2943 } 2944 2945 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 2946 2947 if (!multicast && 2948 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 2949 return RX_QUEUED; 2950 2951 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 2952 eth->h_dest, eth->h_source); 2953 hdrlen = ieee80211_hdrlen(hdr.frame_control); 2954 if (multicast) { 2955 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 2956 2957 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 2958 IEEE80211_ENCRYPT_HEADROOM, 2959 tailroom, GFP_ATOMIC); 2960 if (!fwd_skb) 2961 goto rx_accept; 2962 } else { 2963 fwd_skb = skb; 2964 skb = NULL; 2965 2966 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 2967 return RX_DROP_U_OOM; 2968 2969 if (skb_linearize(fwd_skb)) 2970 return RX_DROP_U_OOM; 2971 } 2972 2973 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 2974 memcpy(fwd_hdr, &hdr, hdrlen - 2); 2975 qos = ieee80211_get_qos_ctl(fwd_hdr); 2976 qos[0] = qos[1] = 0; 2977 2978 skb_reset_mac_header(fwd_skb); 2979 hdrlen += mesh_hdrlen; 2980 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 2981 &fwd_skb->protocol)) 2982 hdrlen += ETH_ALEN; 2983 else 2984 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 2985 skb_set_network_header(fwd_skb, hdrlen + 2); 2986 2987 info = IEEE80211_SKB_CB(fwd_skb); 2988 memset(info, 0, sizeof(*info)); 2989 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 2990 info->control.vif = &sdata->vif; 2991 info->control.jiffies = jiffies; 2992 fwd_skb->dev = sdata->dev; 2993 if (multicast) { 2994 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2995 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2996 /* update power mode indication when forwarding */ 2997 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2998 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2999 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3000 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3001 } else { 3002 /* unable to resolve next hop */ 3003 if (sta) 3004 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3005 hdr.addr3, 0, 3006 WLAN_REASON_MESH_PATH_NOFORWARD, 3007 sta->sta.addr); 3008 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3009 kfree_skb(fwd_skb); 3010 goto rx_accept; 3011 } 3012 3013 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3014 ieee80211_set_qos_hdr(sdata, fwd_skb); 3015 ieee80211_add_pending_skb(local, fwd_skb); 3016 3017 rx_accept: 3018 if (!skb) 3019 return RX_QUEUED; 3020 3021 ieee80211_strip_8023_mesh_hdr(skb); 3022 #endif 3023 3024 return RX_CONTINUE; 3025 } 3026 3027 static ieee80211_rx_result debug_noinline 3028 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3029 { 3030 struct net_device *dev = rx->sdata->dev; 3031 struct sk_buff *skb = rx->skb; 3032 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3033 __le16 fc = hdr->frame_control; 3034 struct sk_buff_head frame_list; 3035 struct ethhdr ethhdr; 3036 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3037 3038 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3039 check_da = NULL; 3040 check_sa = NULL; 3041 } else switch (rx->sdata->vif.type) { 3042 case NL80211_IFTYPE_AP: 3043 case NL80211_IFTYPE_AP_VLAN: 3044 check_da = NULL; 3045 break; 3046 case NL80211_IFTYPE_STATION: 3047 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3048 check_sa = NULL; 3049 break; 3050 case NL80211_IFTYPE_MESH_POINT: 3051 check_sa = NULL; 3052 check_da = NULL; 3053 break; 3054 default: 3055 break; 3056 } 3057 3058 skb->dev = dev; 3059 __skb_queue_head_init(&frame_list); 3060 3061 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3062 rx->sdata->vif.addr, 3063 rx->sdata->vif.type, 3064 data_offset, true)) 3065 return RX_DROP_U_BAD_AMSDU; 3066 3067 if (rx->sta->amsdu_mesh_control < 0) { 3068 s8 valid = -1; 3069 int i; 3070 3071 for (i = 0; i <= 2; i++) { 3072 if (!ieee80211_is_valid_amsdu(skb, i)) 3073 continue; 3074 3075 if (valid >= 0) { 3076 /* ambiguous */ 3077 valid = -1; 3078 break; 3079 } 3080 3081 valid = i; 3082 } 3083 3084 rx->sta->amsdu_mesh_control = valid; 3085 } 3086 3087 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3088 rx->sdata->vif.type, 3089 rx->local->hw.extra_tx_headroom, 3090 check_da, check_sa, 3091 rx->sta->amsdu_mesh_control); 3092 3093 while (!skb_queue_empty(&frame_list)) { 3094 rx->skb = __skb_dequeue(&frame_list); 3095 3096 switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) { 3097 case RX_QUEUED: 3098 break; 3099 case RX_CONTINUE: 3100 if (ieee80211_frame_allowed(rx, fc)) { 3101 ieee80211_deliver_skb(rx); 3102 break; 3103 } 3104 fallthrough; 3105 default: 3106 dev_kfree_skb(rx->skb); 3107 } 3108 } 3109 3110 return RX_QUEUED; 3111 } 3112 3113 static ieee80211_rx_result debug_noinline 3114 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3115 { 3116 struct sk_buff *skb = rx->skb; 3117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3118 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3119 __le16 fc = hdr->frame_control; 3120 3121 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3122 return RX_CONTINUE; 3123 3124 if (unlikely(!ieee80211_is_data(fc))) 3125 return RX_CONTINUE; 3126 3127 if (unlikely(!ieee80211_is_data_present(fc))) 3128 return RX_DROP; 3129 3130 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3131 switch (rx->sdata->vif.type) { 3132 case NL80211_IFTYPE_AP_VLAN: 3133 if (!rx->sdata->u.vlan.sta) 3134 return RX_DROP_U_BAD_4ADDR; 3135 break; 3136 case NL80211_IFTYPE_STATION: 3137 if (!rx->sdata->u.mgd.use_4addr) 3138 return RX_DROP_U_BAD_4ADDR; 3139 break; 3140 case NL80211_IFTYPE_MESH_POINT: 3141 break; 3142 default: 3143 return RX_DROP_U_BAD_4ADDR; 3144 } 3145 } 3146 3147 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3148 return RX_DROP_U_BAD_AMSDU; 3149 3150 if (rx->key) { 3151 /* 3152 * We should not receive A-MSDUs on pre-HT connections, 3153 * and HT connections cannot use old ciphers. Thus drop 3154 * them, as in those cases we couldn't even have SPP 3155 * A-MSDUs or such. 3156 */ 3157 switch (rx->key->conf.cipher) { 3158 case WLAN_CIPHER_SUITE_WEP40: 3159 case WLAN_CIPHER_SUITE_WEP104: 3160 case WLAN_CIPHER_SUITE_TKIP: 3161 return RX_DROP_U_BAD_AMSDU_CIPHER; 3162 default: 3163 break; 3164 } 3165 } 3166 3167 return __ieee80211_rx_h_amsdu(rx, 0); 3168 } 3169 3170 static ieee80211_rx_result debug_noinline 3171 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3172 { 3173 struct ieee80211_sub_if_data *sdata = rx->sdata; 3174 struct ieee80211_local *local = rx->local; 3175 struct net_device *dev = sdata->dev; 3176 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3177 __le16 fc = hdr->frame_control; 3178 ieee80211_rx_result res; 3179 bool port_control; 3180 3181 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3182 return RX_CONTINUE; 3183 3184 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3185 return RX_DROP; 3186 3187 /* Send unexpected-4addr-frame event to hostapd */ 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, rx->link_id, 3194 GFP_ATOMIC); 3195 return RX_DROP; 3196 } 3197 3198 res = __ieee80211_data_to_8023(rx, &port_control); 3199 if (unlikely(res != RX_CONTINUE)) 3200 return res; 3201 3202 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3203 if (res != RX_CONTINUE) 3204 return res; 3205 3206 if (!ieee80211_frame_allowed(rx, fc)) 3207 return RX_DROP; 3208 3209 /* directly handle TDLS channel switch requests/responses */ 3210 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3211 cpu_to_be16(ETH_P_TDLS))) { 3212 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3213 3214 if (pskb_may_pull(rx->skb, 3215 offsetof(struct ieee80211_tdls_data, u)) && 3216 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3217 tf->category == WLAN_CATEGORY_TDLS && 3218 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3219 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3220 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3221 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3222 rx->sta, rx->skb); 3223 return RX_QUEUED; 3224 } 3225 } 3226 3227 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3228 unlikely(port_control) && sdata->bss) { 3229 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3230 u.ap); 3231 dev = sdata->dev; 3232 rx->sdata = sdata; 3233 } 3234 3235 rx->skb->dev = dev; 3236 3237 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3238 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3239 !is_multicast_ether_addr( 3240 ((struct ethhdr *)rx->skb->data)->h_dest) && 3241 (!local->scanning && 3242 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3243 mod_timer(&local->dynamic_ps_timer, jiffies + 3244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3245 3246 ieee80211_deliver_skb(rx); 3247 3248 return RX_QUEUED; 3249 } 3250 3251 static ieee80211_rx_result debug_noinline 3252 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3253 { 3254 struct sk_buff *skb = rx->skb; 3255 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3256 struct tid_ampdu_rx *tid_agg_rx; 3257 u16 start_seq_num; 3258 u16 tid; 3259 3260 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3261 return RX_CONTINUE; 3262 3263 if (ieee80211_is_back_req(bar->frame_control)) { 3264 struct { 3265 __le16 control, start_seq_num; 3266 } __packed bar_data; 3267 struct ieee80211_event event = { 3268 .type = BAR_RX_EVENT, 3269 }; 3270 3271 if (!rx->sta) 3272 return RX_DROP; 3273 3274 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3275 &bar_data, sizeof(bar_data))) 3276 return RX_DROP; 3277 3278 tid = le16_to_cpu(bar_data.control) >> 12; 3279 3280 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3281 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3282 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3283 WLAN_BACK_RECIPIENT, 3284 WLAN_REASON_QSTA_REQUIRE_SETUP); 3285 3286 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3287 if (!tid_agg_rx) 3288 return RX_DROP; 3289 3290 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3291 event.u.ba.tid = tid; 3292 event.u.ba.ssn = start_seq_num; 3293 event.u.ba.sta = &rx->sta->sta; 3294 3295 /* reset session timer */ 3296 if (tid_agg_rx->timeout) 3297 mod_timer(&tid_agg_rx->session_timer, 3298 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3299 3300 spin_lock(&tid_agg_rx->reorder_lock); 3301 /* release stored frames up to start of BAR */ 3302 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3303 start_seq_num, frames); 3304 spin_unlock(&tid_agg_rx->reorder_lock); 3305 3306 drv_event_callback(rx->local, rx->sdata, &event); 3307 3308 kfree_skb(skb); 3309 return RX_QUEUED; 3310 } 3311 3312 return RX_DROP; 3313 } 3314 3315 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3316 struct ieee80211_mgmt *mgmt, 3317 size_t len) 3318 { 3319 struct ieee80211_local *local = sdata->local; 3320 struct sk_buff *skb; 3321 struct ieee80211_mgmt *resp; 3322 3323 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3324 /* Not to own unicast address */ 3325 return; 3326 } 3327 3328 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3329 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3330 /* Not from the current AP or not associated yet. */ 3331 return; 3332 } 3333 3334 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 3335 /* Too short SA Query request frame */ 3336 return; 3337 } 3338 3339 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3340 if (skb == NULL) 3341 return; 3342 3343 skb_reserve(skb, local->hw.extra_tx_headroom); 3344 resp = skb_put_zero(skb, 24); 3345 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3346 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3347 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3348 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3349 IEEE80211_STYPE_ACTION); 3350 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 3351 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3352 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 3353 memcpy(resp->u.action.u.sa_query.trans_id, 3354 mgmt->u.action.u.sa_query.trans_id, 3355 WLAN_SA_QUERY_TR_ID_LEN); 3356 3357 ieee80211_tx_skb(sdata, skb); 3358 } 3359 3360 static void 3361 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3362 { 3363 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3364 struct ieee80211_bss_conf *bss_conf; 3365 const struct element *ie; 3366 size_t baselen; 3367 3368 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3369 NL80211_EXT_FEATURE_BSS_COLOR)) 3370 return; 3371 3372 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3373 return; 3374 3375 bss_conf = rx->link->conf; 3376 if (bss_conf->csa_active || bss_conf->color_change_active || 3377 !bss_conf->he_bss_color.enabled) 3378 return; 3379 3380 baselen = mgmt->u.beacon.variable - rx->skb->data; 3381 if (baselen > rx->skb->len) 3382 return; 3383 3384 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3385 mgmt->u.beacon.variable, 3386 rx->skb->len - baselen); 3387 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3388 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3389 const struct ieee80211_he_operation *he_oper; 3390 u8 color; 3391 3392 he_oper = (void *)(ie->data + 1); 3393 if (le32_get_bits(he_oper->he_oper_params, 3394 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3395 return; 3396 3397 color = le32_get_bits(he_oper->he_oper_params, 3398 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3399 if (color == bss_conf->he_bss_color.color) 3400 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3401 BIT_ULL(color), 3402 bss_conf->link_id); 3403 } 3404 } 3405 3406 static ieee80211_rx_result debug_noinline 3407 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3408 { 3409 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3410 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3411 3412 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3413 return RX_CONTINUE; 3414 3415 /* 3416 * From here on, look only at management frames. 3417 * Data and control frames are already handled, 3418 * and unknown (reserved) frames are useless. 3419 */ 3420 if (rx->skb->len < 24) 3421 return RX_DROP; 3422 3423 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3424 return RX_DROP; 3425 3426 /* drop too small action frames */ 3427 if (ieee80211_is_action(mgmt->frame_control) && 3428 rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 3429 return RX_DROP_U_RUNT_ACTION; 3430 3431 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3432 ieee80211_is_beacon(mgmt->frame_control) && 3433 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3434 int sig = 0; 3435 3436 /* sw bss color collision detection */ 3437 ieee80211_rx_check_bss_color_collision(rx); 3438 3439 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3440 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3441 sig = status->signal; 3442 3443 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3444 rx->skb->data, rx->skb->len, 3445 ieee80211_rx_status_to_khz(status), 3446 sig); 3447 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3448 } 3449 3450 return ieee80211_drop_unencrypted_mgmt(rx); 3451 } 3452 3453 static bool 3454 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3455 { 3456 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3457 struct ieee80211_sub_if_data *sdata = rx->sdata; 3458 3459 /* TWT actions are only supported in AP for the moment */ 3460 if (sdata->vif.type != NL80211_IFTYPE_AP) 3461 return false; 3462 3463 if (!rx->local->ops->add_twt_setup) 3464 return false; 3465 3466 if (!sdata->vif.bss_conf.twt_responder) 3467 return false; 3468 3469 if (!rx->sta) 3470 return false; 3471 3472 switch (mgmt->u.action.u.s1g.action_code) { 3473 case WLAN_S1G_TWT_SETUP: { 3474 struct ieee80211_twt_setup *twt; 3475 3476 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3477 1 + /* action code */ 3478 sizeof(struct ieee80211_twt_setup) + 3479 2 /* TWT req_type agrt */) 3480 break; 3481 3482 twt = (void *)mgmt->u.action.u.s1g.variable; 3483 if (twt->element_id != WLAN_EID_S1G_TWT) 3484 break; 3485 3486 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3487 4 + /* action code + token + tlv */ 3488 twt->length) 3489 break; 3490 3491 return true; /* queue the frame */ 3492 } 3493 case WLAN_S1G_TWT_TEARDOWN: 3494 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2) 3495 break; 3496 3497 return true; /* queue the frame */ 3498 default: 3499 break; 3500 } 3501 3502 return false; 3503 } 3504 3505 static ieee80211_rx_result debug_noinline 3506 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3507 { 3508 struct ieee80211_local *local = rx->local; 3509 struct ieee80211_sub_if_data *sdata = rx->sdata; 3510 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3512 int len = rx->skb->len; 3513 3514 if (!ieee80211_is_action(mgmt->frame_control)) 3515 return RX_CONTINUE; 3516 3517 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3518 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3519 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3520 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3521 3522 switch (mgmt->u.action.category) { 3523 case WLAN_CATEGORY_HT: 3524 /* reject HT action frames from stations not supporting HT */ 3525 if (!rx->link_sta->pub->ht_cap.ht_supported) 3526 goto invalid; 3527 3528 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3529 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3530 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3531 sdata->vif.type != NL80211_IFTYPE_AP && 3532 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3533 break; 3534 3535 /* verify action & smps_control/chanwidth are present */ 3536 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3537 goto invalid; 3538 3539 switch (mgmt->u.action.u.ht_smps.action) { 3540 case WLAN_HT_ACTION_SMPS: { 3541 struct ieee80211_supported_band *sband; 3542 enum ieee80211_smps_mode smps_mode; 3543 struct sta_opmode_info sta_opmode = {}; 3544 3545 if (sdata->vif.type != NL80211_IFTYPE_AP && 3546 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3547 goto handled; 3548 3549 /* convert to HT capability */ 3550 switch (mgmt->u.action.u.ht_smps.smps_control) { 3551 case WLAN_HT_SMPS_CONTROL_DISABLED: 3552 smps_mode = IEEE80211_SMPS_OFF; 3553 break; 3554 case WLAN_HT_SMPS_CONTROL_STATIC: 3555 smps_mode = IEEE80211_SMPS_STATIC; 3556 break; 3557 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3558 smps_mode = IEEE80211_SMPS_DYNAMIC; 3559 break; 3560 default: 3561 goto invalid; 3562 } 3563 3564 /* if no change do nothing */ 3565 if (rx->link_sta->pub->smps_mode == smps_mode) 3566 goto handled; 3567 rx->link_sta->pub->smps_mode = smps_mode; 3568 sta_opmode.smps_mode = 3569 ieee80211_smps_mode_to_smps_mode(smps_mode); 3570 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3571 3572 sband = rx->local->hw.wiphy->bands[status->band]; 3573 3574 rate_control_rate_update(local, sband, rx->link_sta, 3575 IEEE80211_RC_SMPS_CHANGED); 3576 cfg80211_sta_opmode_change_notify(sdata->dev, 3577 rx->sta->addr, 3578 &sta_opmode, 3579 GFP_ATOMIC); 3580 goto handled; 3581 } 3582 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3583 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 3584 3585 if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ && 3586 chanwidth != IEEE80211_HT_CHANWIDTH_ANY) 3587 goto invalid; 3588 3589 /* If it doesn't support 40 MHz it can't change ... */ 3590 if (!(rx->link_sta->pub->ht_cap.cap & 3591 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3592 goto handled; 3593 3594 goto queue; 3595 } 3596 default: 3597 goto invalid; 3598 } 3599 3600 break; 3601 case WLAN_CATEGORY_PUBLIC: 3602 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3603 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3604 goto invalid; 3605 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3606 break; 3607 if (!rx->sta) 3608 break; 3609 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3610 break; 3611 if (mgmt->u.action.u.ext_chan_switch.action_code != 3612 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3613 break; 3614 if (len < offsetof(struct ieee80211_mgmt, 3615 u.action.u.ext_chan_switch.variable)) 3616 goto invalid; 3617 goto queue; 3618 case WLAN_CATEGORY_VHT: 3619 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3620 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3621 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3622 sdata->vif.type != NL80211_IFTYPE_AP && 3623 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3624 break; 3625 3626 /* verify action code is present */ 3627 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3628 goto invalid; 3629 3630 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 3631 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3632 /* verify opmode is present */ 3633 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3634 goto invalid; 3635 goto queue; 3636 } 3637 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3638 if (len < IEEE80211_MIN_ACTION_SIZE + 25) 3639 goto invalid; 3640 goto queue; 3641 } 3642 default: 3643 break; 3644 } 3645 break; 3646 case WLAN_CATEGORY_BACK: 3647 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3648 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3649 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3650 sdata->vif.type != NL80211_IFTYPE_AP && 3651 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3652 break; 3653 3654 /* verify action_code is present */ 3655 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3656 break; 3657 3658 switch (mgmt->u.action.u.addba_req.action_code) { 3659 case WLAN_ACTION_ADDBA_REQ: 3660 if (len < (IEEE80211_MIN_ACTION_SIZE + 3661 sizeof(mgmt->u.action.u.addba_req))) 3662 goto invalid; 3663 break; 3664 case WLAN_ACTION_ADDBA_RESP: 3665 if (len < (IEEE80211_MIN_ACTION_SIZE + 3666 sizeof(mgmt->u.action.u.addba_resp))) 3667 goto invalid; 3668 break; 3669 case WLAN_ACTION_DELBA: 3670 if (len < (IEEE80211_MIN_ACTION_SIZE + 3671 sizeof(mgmt->u.action.u.delba))) 3672 goto invalid; 3673 break; 3674 default: 3675 goto invalid; 3676 } 3677 3678 goto queue; 3679 case WLAN_CATEGORY_SPECTRUM_MGMT: 3680 /* verify action_code is present */ 3681 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3682 break; 3683 3684 switch (mgmt->u.action.u.measurement.action_code) { 3685 case WLAN_ACTION_SPCT_MSR_REQ: 3686 if (status->band != NL80211_BAND_5GHZ) 3687 break; 3688 3689 if (len < (IEEE80211_MIN_ACTION_SIZE + 3690 sizeof(mgmt->u.action.u.measurement))) 3691 break; 3692 3693 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3694 break; 3695 3696 ieee80211_process_measurement_req(sdata, mgmt, len); 3697 goto handled; 3698 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3699 u8 *bssid; 3700 if (len < (IEEE80211_MIN_ACTION_SIZE + 3701 sizeof(mgmt->u.action.u.chan_switch))) 3702 break; 3703 3704 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3705 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3706 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3707 break; 3708 3709 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3710 bssid = sdata->deflink.u.mgd.bssid; 3711 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3712 bssid = sdata->u.ibss.bssid; 3713 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3714 bssid = mgmt->sa; 3715 else 3716 break; 3717 3718 if (!ether_addr_equal(mgmt->bssid, bssid)) 3719 break; 3720 3721 goto queue; 3722 } 3723 } 3724 break; 3725 case WLAN_CATEGORY_SELF_PROTECTED: 3726 if (len < (IEEE80211_MIN_ACTION_SIZE + 3727 sizeof(mgmt->u.action.u.self_prot.action_code))) 3728 break; 3729 3730 switch (mgmt->u.action.u.self_prot.action_code) { 3731 case WLAN_SP_MESH_PEERING_OPEN: 3732 case WLAN_SP_MESH_PEERING_CLOSE: 3733 case WLAN_SP_MESH_PEERING_CONFIRM: 3734 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3735 goto invalid; 3736 if (sdata->u.mesh.user_mpm) 3737 /* userspace handles this frame */ 3738 break; 3739 goto queue; 3740 case WLAN_SP_MGK_INFORM: 3741 case WLAN_SP_MGK_ACK: 3742 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3743 goto invalid; 3744 break; 3745 } 3746 break; 3747 case WLAN_CATEGORY_MESH_ACTION: 3748 if (len < (IEEE80211_MIN_ACTION_SIZE + 3749 sizeof(mgmt->u.action.u.mesh_action.action_code))) 3750 break; 3751 3752 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3753 break; 3754 if (mesh_action_is_path_sel(mgmt) && 3755 !mesh_path_sel_is_hwmp(sdata)) 3756 break; 3757 goto queue; 3758 case WLAN_CATEGORY_S1G: 3759 if (len < offsetofend(typeof(*mgmt), 3760 u.action.u.s1g.action_code)) 3761 break; 3762 3763 switch (mgmt->u.action.u.s1g.action_code) { 3764 case WLAN_S1G_TWT_SETUP: 3765 case WLAN_S1G_TWT_TEARDOWN: 3766 if (ieee80211_process_rx_twt_action(rx)) 3767 goto queue; 3768 break; 3769 default: 3770 break; 3771 } 3772 break; 3773 case WLAN_CATEGORY_PROTECTED_EHT: 3774 if (len < offsetofend(typeof(*mgmt), 3775 u.action.u.ttlm_req.action_code)) 3776 break; 3777 3778 switch (mgmt->u.action.u.ttlm_req.action_code) { 3779 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3780 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3781 break; 3782 3783 if (len < offsetofend(typeof(*mgmt), 3784 u.action.u.ttlm_req)) 3785 goto invalid; 3786 goto queue; 3787 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3788 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3789 break; 3790 3791 if (len < offsetofend(typeof(*mgmt), 3792 u.action.u.ttlm_res)) 3793 goto invalid; 3794 goto queue; 3795 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3796 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3797 break; 3798 3799 if (len < offsetofend(typeof(*mgmt), 3800 u.action.u.ttlm_tear_down)) 3801 goto invalid; 3802 goto queue; 3803 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3804 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3805 break; 3806 3807 /* The reconfiguration response action frame must 3808 * least one 'Status Duple' entry (3 octets) 3809 */ 3810 if (len < 3811 offsetofend(typeof(*mgmt), 3812 u.action.u.ml_reconf_resp) + 3) 3813 goto invalid; 3814 goto queue; 3815 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3816 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3817 break; 3818 3819 if (len < offsetofend(typeof(*mgmt), 3820 u.action.u.epcs) + 3821 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3822 goto invalid; 3823 goto queue; 3824 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3825 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3826 break; 3827 3828 if (len < offsetofend(typeof(*mgmt), 3829 u.action.u.epcs)) 3830 goto invalid; 3831 goto queue; 3832 default: 3833 break; 3834 } 3835 break; 3836 } 3837 3838 return RX_CONTINUE; 3839 3840 invalid: 3841 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3842 /* will return in the next handlers */ 3843 return RX_CONTINUE; 3844 3845 handled: 3846 if (rx->sta) 3847 rx->link_sta->rx_stats.packets++; 3848 dev_kfree_skb(rx->skb); 3849 return RX_QUEUED; 3850 3851 queue: 3852 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3853 return RX_QUEUED; 3854 } 3855 3856 static ieee80211_rx_result debug_noinline 3857 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3858 { 3859 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3860 struct cfg80211_rx_info info = { 3861 .freq = ieee80211_rx_status_to_khz(status), 3862 .buf = rx->skb->data, 3863 .len = rx->skb->len, 3864 .link_id = rx->link_id, 3865 .have_link_id = rx->link_id >= 0, 3866 }; 3867 3868 /* skip known-bad action frames and return them in the next handler */ 3869 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3870 return RX_CONTINUE; 3871 3872 /* 3873 * Getting here means the kernel doesn't know how to handle 3874 * it, but maybe userspace does ... include returned frames 3875 * so userspace can register for those to know whether ones 3876 * it transmitted were processed or returned. 3877 */ 3878 3879 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3880 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3881 info.sig_dbm = status->signal; 3882 3883 if (ieee80211_is_timing_measurement(rx->skb) || 3884 ieee80211_is_ftm(rx->skb)) { 3885 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 3886 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 3887 } 3888 3889 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 3890 if (rx->sta) 3891 rx->link_sta->rx_stats.packets++; 3892 dev_kfree_skb(rx->skb); 3893 return RX_QUEUED; 3894 } 3895 3896 return RX_CONTINUE; 3897 } 3898 3899 static ieee80211_rx_result debug_noinline 3900 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 3901 { 3902 struct ieee80211_sub_if_data *sdata = rx->sdata; 3903 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3904 int len = rx->skb->len; 3905 3906 if (!ieee80211_is_action(mgmt->frame_control)) 3907 return RX_CONTINUE; 3908 3909 switch (mgmt->u.action.category) { 3910 case WLAN_CATEGORY_SA_QUERY: 3911 if (len < (IEEE80211_MIN_ACTION_SIZE + 3912 sizeof(mgmt->u.action.u.sa_query))) 3913 break; 3914 3915 switch (mgmt->u.action.u.sa_query.action) { 3916 case WLAN_ACTION_SA_QUERY_REQUEST: 3917 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3918 break; 3919 ieee80211_process_sa_query_req(sdata, mgmt, len); 3920 goto handled; 3921 } 3922 break; 3923 } 3924 3925 return RX_CONTINUE; 3926 3927 handled: 3928 if (rx->sta) 3929 rx->link_sta->rx_stats.packets++; 3930 dev_kfree_skb(rx->skb); 3931 return RX_QUEUED; 3932 } 3933 3934 static ieee80211_rx_result debug_noinline 3935 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 3936 { 3937 struct ieee80211_local *local = rx->local; 3938 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3939 struct sk_buff *nskb; 3940 struct ieee80211_sub_if_data *sdata = rx->sdata; 3941 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3942 3943 if (!ieee80211_is_action(mgmt->frame_control)) 3944 return RX_CONTINUE; 3945 3946 /* 3947 * For AP mode, hostapd is responsible for handling any action 3948 * frames that we didn't handle, including returning unknown 3949 * ones. For all other modes we will return them to the sender, 3950 * setting the 0x80 bit in the action category, as required by 3951 * 802.11-2012 9.24.4. 3952 * Newer versions of hostapd use the management frame registration 3953 * mechanisms and old cooked monitor interface is no longer supported. 3954 */ 3955 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 3956 (sdata->vif.type == NL80211_IFTYPE_AP || 3957 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 3958 return RX_DROP; 3959 3960 if (is_multicast_ether_addr(mgmt->da)) 3961 return RX_DROP; 3962 3963 /* do not return rejected action frames */ 3964 if (mgmt->u.action.category & 0x80) 3965 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 3966 3967 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 3968 GFP_ATOMIC); 3969 if (nskb) { 3970 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 3971 3972 nmgmt->u.action.category |= 0x80; 3973 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 3974 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 3975 3976 memset(nskb->cb, 0, sizeof(nskb->cb)); 3977 3978 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 3979 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 3980 3981 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 3982 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 3983 IEEE80211_TX_CTL_NO_CCK_RATE; 3984 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 3985 info->hw_queue = 3986 local->hw.offchannel_tx_hw_queue; 3987 } 3988 3989 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 3990 status->band); 3991 } 3992 3993 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 3994 } 3995 3996 static ieee80211_rx_result debug_noinline 3997 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 3998 { 3999 struct ieee80211_sub_if_data *sdata = rx->sdata; 4000 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4001 4002 if (!ieee80211_is_ext(hdr->frame_control)) 4003 return RX_CONTINUE; 4004 4005 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4006 return RX_DROP; 4007 4008 /* for now only beacons are ext, so queue them */ 4009 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4010 4011 return RX_QUEUED; 4012 } 4013 4014 static ieee80211_rx_result debug_noinline 4015 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4016 { 4017 struct ieee80211_sub_if_data *sdata = rx->sdata; 4018 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4019 __le16 stype; 4020 4021 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4022 4023 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4024 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4025 sdata->vif.type != NL80211_IFTYPE_OCB && 4026 sdata->vif.type != NL80211_IFTYPE_STATION) 4027 return RX_DROP; 4028 4029 switch (stype) { 4030 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4031 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4032 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4033 /* process for all: mesh, mlme, ibss */ 4034 break; 4035 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4036 if (is_multicast_ether_addr(mgmt->da) && 4037 !is_broadcast_ether_addr(mgmt->da)) 4038 return RX_DROP; 4039 4040 /* process only for station/IBSS */ 4041 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4042 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4043 return RX_DROP; 4044 break; 4045 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4046 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4047 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4048 if (is_multicast_ether_addr(mgmt->da) && 4049 !is_broadcast_ether_addr(mgmt->da)) 4050 return RX_DROP; 4051 4052 /* process only for station */ 4053 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4054 return RX_DROP; 4055 break; 4056 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4057 /* process only for ibss and mesh */ 4058 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4059 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4060 return RX_DROP; 4061 break; 4062 default: 4063 return RX_DROP; 4064 } 4065 4066 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4067 4068 return RX_QUEUED; 4069 } 4070 4071 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4072 ieee80211_rx_result res) 4073 { 4074 if (res == RX_QUEUED) { 4075 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4076 return; 4077 } 4078 4079 if (res != RX_CONTINUE) { 4080 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4081 if (rx->sta) 4082 rx->link_sta->rx_stats.dropped++; 4083 } 4084 4085 kfree_skb_reason(rx->skb, (__force u32)res); 4086 } 4087 4088 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4089 struct sk_buff_head *frames) 4090 { 4091 ieee80211_rx_result res = RX_DROP; 4092 struct sk_buff *skb; 4093 4094 #define CALL_RXH(rxh) \ 4095 do { \ 4096 res = rxh(rx); \ 4097 if (res != RX_CONTINUE) \ 4098 goto rxh_next; \ 4099 } while (0) 4100 4101 /* Lock here to avoid hitting all of the data used in the RX 4102 * path (e.g. key data, station data, ...) concurrently when 4103 * a frame is released from the reorder buffer due to timeout 4104 * from the timer, potentially concurrently with RX from the 4105 * driver. 4106 */ 4107 spin_lock_bh(&rx->local->rx_path_lock); 4108 4109 while ((skb = __skb_dequeue(frames))) { 4110 /* 4111 * all the other fields are valid across frames 4112 * that belong to an aMPDU since they are on the 4113 * same TID from the same station 4114 */ 4115 rx->skb = skb; 4116 4117 if (WARN_ON_ONCE(!rx->link)) 4118 goto rxh_next; 4119 4120 CALL_RXH(ieee80211_rx_h_check_more_data); 4121 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4122 CALL_RXH(ieee80211_rx_h_sta_process); 4123 CALL_RXH(ieee80211_rx_h_decrypt); 4124 CALL_RXH(ieee80211_rx_h_defragment); 4125 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4126 /* must be after MMIC verify so header is counted in MPDU mic */ 4127 CALL_RXH(ieee80211_rx_h_amsdu); 4128 CALL_RXH(ieee80211_rx_h_data); 4129 4130 /* special treatment -- needs the queue */ 4131 res = ieee80211_rx_h_ctrl(rx, frames); 4132 if (res != RX_CONTINUE) 4133 goto rxh_next; 4134 4135 CALL_RXH(ieee80211_rx_h_mgmt_check); 4136 CALL_RXH(ieee80211_rx_h_action); 4137 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4138 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4139 CALL_RXH(ieee80211_rx_h_action_return); 4140 CALL_RXH(ieee80211_rx_h_ext); 4141 CALL_RXH(ieee80211_rx_h_mgmt); 4142 4143 rxh_next: 4144 ieee80211_rx_handlers_result(rx, res); 4145 4146 #undef CALL_RXH 4147 } 4148 4149 spin_unlock_bh(&rx->local->rx_path_lock); 4150 } 4151 4152 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4153 { 4154 struct sk_buff_head reorder_release; 4155 ieee80211_rx_result res = RX_DROP; 4156 4157 __skb_queue_head_init(&reorder_release); 4158 4159 #define CALL_RXH(rxh) \ 4160 do { \ 4161 res = rxh(rx); \ 4162 if (res != RX_CONTINUE) \ 4163 goto rxh_next; \ 4164 } while (0) 4165 4166 CALL_RXH(ieee80211_rx_h_check_dup); 4167 CALL_RXH(ieee80211_rx_h_check); 4168 4169 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4170 4171 ieee80211_rx_handlers(rx, &reorder_release); 4172 return; 4173 4174 rxh_next: 4175 ieee80211_rx_handlers_result(rx, res); 4176 4177 #undef CALL_RXH 4178 } 4179 4180 static bool 4181 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4182 { 4183 return !!(sta->valid_links & BIT(link_id)); 4184 } 4185 4186 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4187 u8 link_id) 4188 { 4189 rx->link_id = link_id; 4190 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4191 4192 if (!rx->sta) 4193 return rx->link; 4194 4195 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4196 return false; 4197 4198 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4199 4200 return rx->link && rx->link_sta; 4201 } 4202 4203 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4204 struct sta_info *sta, int link_id) 4205 { 4206 rx->link_id = link_id; 4207 rx->sta = sta; 4208 4209 if (sta) { 4210 rx->local = sta->sdata->local; 4211 if (!rx->sdata) 4212 rx->sdata = sta->sdata; 4213 rx->link_sta = &sta->deflink; 4214 } else { 4215 rx->link_sta = NULL; 4216 } 4217 4218 if (link_id < 0) { 4219 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4220 sta && !sta->sta.valid_links) 4221 rx->link = 4222 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4223 else 4224 rx->link = &rx->sdata->deflink; 4225 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4226 return false; 4227 } 4228 4229 return true; 4230 } 4231 4232 /* 4233 * This function makes calls into the RX path, therefore 4234 * it has to be invoked under RCU read lock. 4235 */ 4236 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4237 { 4238 struct sk_buff_head frames; 4239 struct ieee80211_rx_data rx = { 4240 /* This is OK -- must be QoS data frame */ 4241 .security_idx = tid, 4242 .seqno_idx = tid, 4243 }; 4244 struct tid_ampdu_rx *tid_agg_rx; 4245 int link_id = -1; 4246 4247 /* FIXME: statistics won't be right with this */ 4248 if (sta->sta.valid_links) 4249 link_id = ffs(sta->sta.valid_links) - 1; 4250 4251 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4252 return; 4253 4254 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4255 if (!tid_agg_rx) 4256 return; 4257 4258 __skb_queue_head_init(&frames); 4259 4260 spin_lock(&tid_agg_rx->reorder_lock); 4261 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4262 spin_unlock(&tid_agg_rx->reorder_lock); 4263 4264 if (!skb_queue_empty(&frames)) { 4265 struct ieee80211_event event = { 4266 .type = BA_FRAME_TIMEOUT, 4267 .u.ba.tid = tid, 4268 .u.ba.sta = &sta->sta, 4269 }; 4270 drv_event_callback(rx.local, rx.sdata, &event); 4271 } 4272 4273 ieee80211_rx_handlers(&rx, &frames); 4274 } 4275 4276 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4277 u16 ssn, u64 filtered, 4278 u16 received_mpdus) 4279 { 4280 struct ieee80211_local *local; 4281 struct sta_info *sta; 4282 struct tid_ampdu_rx *tid_agg_rx; 4283 struct sk_buff_head frames; 4284 struct ieee80211_rx_data rx = { 4285 /* This is OK -- must be QoS data frame */ 4286 .security_idx = tid, 4287 .seqno_idx = tid, 4288 }; 4289 int i, diff; 4290 4291 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4292 return; 4293 4294 __skb_queue_head_init(&frames); 4295 4296 sta = container_of(pubsta, struct sta_info, sta); 4297 4298 local = sta->sdata->local; 4299 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4300 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4301 local->hw.max_rx_aggregation_subframes); 4302 4303 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4304 return; 4305 4306 rcu_read_lock(); 4307 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4308 if (!tid_agg_rx) 4309 goto out; 4310 4311 spin_lock_bh(&tid_agg_rx->reorder_lock); 4312 4313 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4314 int release; 4315 4316 /* release all frames in the reorder buffer */ 4317 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4318 IEEE80211_SN_MODULO; 4319 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4320 release, &frames); 4321 /* update ssn to match received ssn */ 4322 tid_agg_rx->head_seq_num = ssn; 4323 } else { 4324 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4325 &frames); 4326 } 4327 4328 /* handle the case that received ssn is behind the mac ssn. 4329 * it can be tid_agg_rx->buf_size behind and still be valid */ 4330 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4331 if (diff >= tid_agg_rx->buf_size) { 4332 tid_agg_rx->reorder_buf_filtered = 0; 4333 goto release; 4334 } 4335 filtered = filtered >> diff; 4336 ssn += diff; 4337 4338 /* update bitmap */ 4339 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4340 int index = (ssn + i) % tid_agg_rx->buf_size; 4341 4342 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4343 if (filtered & BIT_ULL(i)) 4344 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4345 } 4346 4347 /* now process also frames that the filter marking released */ 4348 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4349 4350 release: 4351 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4352 4353 ieee80211_rx_handlers(&rx, &frames); 4354 4355 out: 4356 rcu_read_unlock(); 4357 } 4358 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4359 4360 /* main receive path */ 4361 4362 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4363 { 4364 return ether_addr_equal(raddr, addr) || 4365 is_broadcast_ether_addr(raddr); 4366 } 4367 4368 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4369 { 4370 struct ieee80211_sub_if_data *sdata = rx->sdata; 4371 struct sk_buff *skb = rx->skb; 4372 struct ieee80211_hdr *hdr = (void *)skb->data; 4373 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4374 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4375 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4376 ieee80211_is_s1g_beacon(hdr->frame_control); 4377 4378 switch (sdata->vif.type) { 4379 case NL80211_IFTYPE_STATION: 4380 if (!bssid && !sdata->u.mgd.use_4addr) 4381 return false; 4382 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4383 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4384 return false; 4385 if (multicast) 4386 return true; 4387 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4388 case NL80211_IFTYPE_ADHOC: 4389 if (!bssid) 4390 return false; 4391 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4392 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4393 !is_valid_ether_addr(hdr->addr2)) 4394 return false; 4395 if (ieee80211_is_beacon(hdr->frame_control)) 4396 return true; 4397 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4398 return false; 4399 if (!multicast && 4400 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4401 return false; 4402 if (!rx->sta) { 4403 int rate_idx; 4404 if (status->encoding != RX_ENC_LEGACY) 4405 rate_idx = 0; /* TODO: HT/VHT rates */ 4406 else 4407 rate_idx = status->rate_idx; 4408 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4409 BIT(rate_idx)); 4410 } 4411 return true; 4412 case NL80211_IFTYPE_OCB: 4413 if (!bssid) 4414 return false; 4415 if (!ieee80211_is_data_present(hdr->frame_control)) 4416 return false; 4417 if (!is_broadcast_ether_addr(bssid)) 4418 return false; 4419 if (!multicast && 4420 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4421 return false; 4422 /* reject invalid/our STA address */ 4423 if (!is_valid_ether_addr(hdr->addr2) || 4424 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4425 return false; 4426 if (!rx->sta) { 4427 int rate_idx; 4428 if (status->encoding != RX_ENC_LEGACY) 4429 rate_idx = 0; /* TODO: HT rates */ 4430 else 4431 rate_idx = status->rate_idx; 4432 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4433 BIT(rate_idx)); 4434 } 4435 return true; 4436 case NL80211_IFTYPE_MESH_POINT: 4437 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4438 return false; 4439 if (multicast) 4440 return true; 4441 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4442 case NL80211_IFTYPE_AP_VLAN: 4443 case NL80211_IFTYPE_AP: 4444 if (!bssid) 4445 return ieee80211_is_our_addr(sdata, hdr->addr1, 4446 &rx->link_id); 4447 4448 if (!is_broadcast_ether_addr(bssid) && 4449 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4450 /* 4451 * Accept public action frames even when the 4452 * BSSID doesn't match, this is used for P2P 4453 * and location updates. Note that mac80211 4454 * itself never looks at these frames. 4455 */ 4456 if (!multicast && 4457 !ieee80211_is_our_addr(sdata, hdr->addr1, 4458 &rx->link_id)) 4459 return false; 4460 if (ieee80211_is_public_action(hdr, skb->len)) 4461 return true; 4462 return ieee80211_is_beacon(hdr->frame_control); 4463 } 4464 4465 if (!ieee80211_has_tods(hdr->frame_control)) { 4466 /* ignore data frames to TDLS-peers */ 4467 if (ieee80211_is_data(hdr->frame_control)) 4468 return false; 4469 /* ignore action frames to TDLS-peers */ 4470 if (ieee80211_is_action(hdr->frame_control) && 4471 !is_broadcast_ether_addr(bssid) && 4472 !ether_addr_equal(bssid, hdr->addr1)) 4473 return false; 4474 } 4475 4476 /* 4477 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4478 * the BSSID - we've checked that already but may have accepted 4479 * the wildcard (ff:ff:ff:ff:ff:ff). 4480 * 4481 * It also says: 4482 * The BSSID of the Data frame is determined as follows: 4483 * a) If the STA is contained within an AP or is associated 4484 * with an AP, the BSSID is the address currently in use 4485 * by the STA contained in the AP. 4486 * 4487 * So we should not accept data frames with an address that's 4488 * multicast. 4489 * 4490 * Accepting it also opens a security problem because stations 4491 * could encrypt it with the GTK and inject traffic that way. 4492 */ 4493 if (ieee80211_is_data(hdr->frame_control) && multicast) 4494 return false; 4495 4496 return true; 4497 case NL80211_IFTYPE_P2P_DEVICE: 4498 return ieee80211_is_public_action(hdr, skb->len) || 4499 ieee80211_is_probe_req(hdr->frame_control) || 4500 ieee80211_is_probe_resp(hdr->frame_control) || 4501 ieee80211_is_beacon(hdr->frame_control) || 4502 (ieee80211_is_auth(hdr->frame_control) && 4503 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4504 case NL80211_IFTYPE_NAN: 4505 /* Currently no frames on NAN interface are allowed */ 4506 return false; 4507 default: 4508 break; 4509 } 4510 4511 WARN_ON_ONCE(1); 4512 return false; 4513 } 4514 4515 void ieee80211_check_fast_rx(struct sta_info *sta) 4516 { 4517 struct ieee80211_sub_if_data *sdata = sta->sdata; 4518 struct ieee80211_local *local = sdata->local; 4519 struct ieee80211_key *key; 4520 struct ieee80211_fast_rx fastrx = { 4521 .dev = sdata->dev, 4522 .vif_type = sdata->vif.type, 4523 .control_port_protocol = sdata->control_port_protocol, 4524 }, *old, *new = NULL; 4525 u32 offload_flags; 4526 bool set_offload = false; 4527 bool assign = false; 4528 bool offload; 4529 4530 /* use sparse to check that we don't return without updating */ 4531 __acquire(check_fast_rx); 4532 4533 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4534 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4535 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4536 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4537 4538 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4539 4540 /* fast-rx doesn't do reordering */ 4541 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4542 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4543 goto clear; 4544 4545 switch (sdata->vif.type) { 4546 case NL80211_IFTYPE_STATION: 4547 if (sta->sta.tdls) { 4548 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4549 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4550 fastrx.expected_ds_bits = 0; 4551 } else { 4552 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4553 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4554 fastrx.expected_ds_bits = 4555 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4556 } 4557 4558 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4559 fastrx.expected_ds_bits |= 4560 cpu_to_le16(IEEE80211_FCTL_TODS); 4561 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4562 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4563 } 4564 4565 if (!sdata->u.mgd.powersave) 4566 break; 4567 4568 /* software powersave is a huge mess, avoid all of it */ 4569 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4570 goto clear; 4571 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4572 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4573 goto clear; 4574 break; 4575 case NL80211_IFTYPE_AP_VLAN: 4576 case NL80211_IFTYPE_AP: 4577 /* parallel-rx requires this, at least with calls to 4578 * ieee80211_sta_ps_transition() 4579 */ 4580 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4581 goto clear; 4582 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4583 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4584 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4585 4586 fastrx.internal_forward = 4587 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4588 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4589 !sdata->u.vlan.sta); 4590 4591 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4592 sdata->u.vlan.sta) { 4593 fastrx.expected_ds_bits |= 4594 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4595 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4596 fastrx.internal_forward = 0; 4597 } 4598 4599 break; 4600 case NL80211_IFTYPE_MESH_POINT: 4601 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4602 IEEE80211_FCTL_TODS); 4603 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4604 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4605 break; 4606 default: 4607 goto clear; 4608 } 4609 4610 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4611 goto clear; 4612 4613 rcu_read_lock(); 4614 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4615 if (!key) 4616 key = rcu_dereference(sdata->default_unicast_key); 4617 if (key) { 4618 switch (key->conf.cipher) { 4619 case WLAN_CIPHER_SUITE_TKIP: 4620 /* we don't want to deal with MMIC in fast-rx */ 4621 goto clear_rcu; 4622 case WLAN_CIPHER_SUITE_CCMP: 4623 case WLAN_CIPHER_SUITE_CCMP_256: 4624 case WLAN_CIPHER_SUITE_GCMP: 4625 case WLAN_CIPHER_SUITE_GCMP_256: 4626 break; 4627 default: 4628 /* We also don't want to deal with 4629 * WEP or cipher scheme. 4630 */ 4631 goto clear_rcu; 4632 } 4633 4634 fastrx.key = true; 4635 fastrx.icv_len = key->conf.icv_len; 4636 } 4637 4638 assign = true; 4639 clear_rcu: 4640 rcu_read_unlock(); 4641 clear: 4642 __release(check_fast_rx); 4643 4644 if (assign) 4645 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4646 4647 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4648 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4649 4650 if (assign && offload) 4651 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4652 else 4653 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4654 4655 if (set_offload) 4656 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4657 4658 spin_lock_bh(&sta->lock); 4659 old = rcu_dereference_protected(sta->fast_rx, true); 4660 rcu_assign_pointer(sta->fast_rx, new); 4661 spin_unlock_bh(&sta->lock); 4662 4663 if (old) 4664 kfree_rcu(old, rcu_head); 4665 } 4666 4667 void ieee80211_clear_fast_rx(struct sta_info *sta) 4668 { 4669 struct ieee80211_fast_rx *old; 4670 4671 spin_lock_bh(&sta->lock); 4672 old = rcu_dereference_protected(sta->fast_rx, true); 4673 RCU_INIT_POINTER(sta->fast_rx, NULL); 4674 spin_unlock_bh(&sta->lock); 4675 4676 if (old) 4677 kfree_rcu(old, rcu_head); 4678 } 4679 4680 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4681 { 4682 struct ieee80211_local *local = sdata->local; 4683 struct sta_info *sta; 4684 4685 lockdep_assert_wiphy(local->hw.wiphy); 4686 4687 list_for_each_entry(sta, &local->sta_list, list) { 4688 if (sdata != sta->sdata && 4689 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4690 continue; 4691 ieee80211_check_fast_rx(sta); 4692 } 4693 } 4694 4695 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4696 { 4697 struct ieee80211_local *local = sdata->local; 4698 4699 lockdep_assert_wiphy(local->hw.wiphy); 4700 4701 __ieee80211_check_fast_rx_iface(sdata); 4702 } 4703 4704 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4705 struct ieee80211_fast_rx *fast_rx, 4706 int orig_len) 4707 { 4708 struct ieee80211_sta_rx_stats *stats; 4709 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4710 struct sta_info *sta = rx->sta; 4711 struct link_sta_info *link_sta; 4712 struct sk_buff *skb = rx->skb; 4713 void *sa = skb->data + ETH_ALEN; 4714 void *da = skb->data; 4715 4716 if (rx->link_id >= 0) { 4717 link_sta = rcu_dereference(sta->link[rx->link_id]); 4718 if (WARN_ON_ONCE(!link_sta)) { 4719 dev_kfree_skb(rx->skb); 4720 return; 4721 } 4722 } else { 4723 link_sta = &sta->deflink; 4724 } 4725 4726 stats = &link_sta->rx_stats; 4727 if (fast_rx->uses_rss) 4728 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4729 4730 /* statistics part of ieee80211_rx_h_sta_process() */ 4731 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4732 stats->last_signal = status->signal; 4733 if (!fast_rx->uses_rss) 4734 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4735 -status->signal); 4736 } 4737 4738 if (status->chains) { 4739 int i; 4740 4741 stats->chains = status->chains; 4742 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4743 int signal = status->chain_signal[i]; 4744 4745 if (!(status->chains & BIT(i))) 4746 continue; 4747 4748 stats->chain_signal_last[i] = signal; 4749 if (!fast_rx->uses_rss) 4750 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4751 -signal); 4752 } 4753 } 4754 /* end of statistics */ 4755 4756 stats->last_rx = jiffies; 4757 stats->last_rate = sta_stats_encode_rate(status); 4758 4759 stats->fragments++; 4760 stats->packets++; 4761 4762 skb->dev = fast_rx->dev; 4763 4764 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4765 4766 /* The seqno index has the same property as needed 4767 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4768 * for non-QoS-data frames. Here we know it's a data 4769 * frame, so count MSDUs. 4770 */ 4771 u64_stats_update_begin(&stats->syncp); 4772 stats->msdu[rx->seqno_idx]++; 4773 stats->bytes += orig_len; 4774 u64_stats_update_end(&stats->syncp); 4775 4776 if (fast_rx->internal_forward) { 4777 struct sk_buff *xmit_skb = NULL; 4778 if (is_multicast_ether_addr(da)) { 4779 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4780 } else if (!ether_addr_equal(da, sa) && 4781 sta_info_get(rx->sdata, da)) { 4782 xmit_skb = skb; 4783 skb = NULL; 4784 } 4785 4786 if (xmit_skb) { 4787 /* 4788 * Send to wireless media and increase priority by 256 4789 * to keep the received priority instead of 4790 * reclassifying the frame (see cfg80211_classify8021d). 4791 */ 4792 xmit_skb->priority += 256; 4793 xmit_skb->protocol = htons(ETH_P_802_3); 4794 skb_reset_network_header(xmit_skb); 4795 skb_reset_mac_header(xmit_skb); 4796 dev_queue_xmit(xmit_skb); 4797 } 4798 4799 if (!skb) 4800 return; 4801 } 4802 4803 /* deliver to local stack */ 4804 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4805 ieee80211_deliver_skb_to_local_stack(skb, rx); 4806 } 4807 4808 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4809 struct ieee80211_fast_rx *fast_rx) 4810 { 4811 struct sk_buff *skb = rx->skb; 4812 struct ieee80211_hdr *hdr = (void *)skb->data; 4813 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4814 static ieee80211_rx_result res; 4815 int orig_len = skb->len; 4816 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4817 int snap_offs = hdrlen; 4818 struct { 4819 u8 snap[sizeof(rfc1042_header)]; 4820 __be16 proto; 4821 } *payload __aligned(2); 4822 struct { 4823 u8 da[ETH_ALEN]; 4824 u8 sa[ETH_ALEN]; 4825 } addrs __aligned(2); 4826 struct ieee80211_sta_rx_stats *stats; 4827 4828 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4829 * to a common data structure; drivers can implement that per queue 4830 * but we don't have that information in mac80211 4831 */ 4832 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4833 return false; 4834 4835 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4836 4837 /* If using encryption, we also need to have: 4838 * - PN_VALIDATED: similar, but the implementation is tricky 4839 * - DECRYPTED: necessary for PN_VALIDATED 4840 */ 4841 if (fast_rx->key && 4842 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4843 return false; 4844 4845 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4846 return false; 4847 4848 if (unlikely(ieee80211_is_frag(hdr))) 4849 return false; 4850 4851 /* Since our interface address cannot be multicast, this 4852 * implicitly also rejects multicast frames without the 4853 * explicit check. 4854 * 4855 * We shouldn't get any *data* frames not addressed to us 4856 * (AP mode will accept multicast *management* frames), but 4857 * punting here will make it go through the full checks in 4858 * ieee80211_accept_frame(). 4859 */ 4860 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4861 return false; 4862 4863 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4864 IEEE80211_FCTL_TODS)) != 4865 fast_rx->expected_ds_bits) 4866 return false; 4867 4868 /* assign the key to drop unencrypted frames (later) 4869 * and strip the IV/MIC if necessary 4870 */ 4871 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4872 /* GCMP header length is the same */ 4873 snap_offs += IEEE80211_CCMP_HDR_LEN; 4874 } 4875 4876 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 4877 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 4878 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4879 return false; 4880 4881 payload = (void *)(skb->data + snap_offs); 4882 4883 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4884 return false; 4885 4886 /* Don't handle these here since they require special code. 4887 * Accept AARP and IPX even though they should come with a 4888 * bridge-tunnel header - but if we get them this way then 4889 * there's little point in discarding them. 4890 */ 4891 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4892 payload->proto == fast_rx->control_port_protocol)) 4893 return false; 4894 } 4895 4896 /* after this point, don't punt to the slowpath! */ 4897 4898 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 4899 pskb_trim(skb, skb->len - fast_rx->icv_len)) 4900 goto drop; 4901 4902 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 4903 goto drop; 4904 4905 if (status->rx_flags & IEEE80211_RX_AMSDU) { 4906 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 4907 RX_QUEUED) 4908 goto drop; 4909 4910 return true; 4911 } 4912 4913 /* do the header conversion - first grab the addresses */ 4914 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 4915 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 4916 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 4917 skb_pull(skb, snap_offs - 2); 4918 put_unaligned_be16(skb->len - 2, skb->data); 4919 } else { 4920 skb_postpull_rcsum(skb, skb->data + snap_offs, 4921 sizeof(rfc1042_header) + 2); 4922 4923 /* remove the SNAP but leave the ethertype */ 4924 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 4925 } 4926 /* push the addresses in front */ 4927 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 4928 4929 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 4930 switch (res) { 4931 case RX_QUEUED: 4932 return true; 4933 case RX_CONTINUE: 4934 break; 4935 default: 4936 goto drop; 4937 } 4938 4939 ieee80211_rx_8023(rx, fast_rx, orig_len); 4940 4941 return true; 4942 drop: 4943 dev_kfree_skb(skb); 4944 4945 if (fast_rx->uses_rss) 4946 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 4947 else 4948 stats = &rx->link_sta->rx_stats; 4949 4950 stats->dropped++; 4951 return true; 4952 } 4953 4954 /* 4955 * This function returns whether or not the SKB 4956 * was destined for RX processing or not, which, 4957 * if consume is true, is equivalent to whether 4958 * or not the skb was consumed. 4959 */ 4960 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 4961 struct sk_buff *skb, bool consume) 4962 { 4963 struct ieee80211_local *local = rx->local; 4964 struct ieee80211_sub_if_data *sdata = rx->sdata; 4965 struct ieee80211_hdr *hdr = (void *)skb->data; 4966 struct link_sta_info *link_sta = rx->link_sta; 4967 struct ieee80211_link_data *link = rx->link; 4968 4969 rx->skb = skb; 4970 4971 /* See if we can do fast-rx; if we have to copy we already lost, 4972 * so punt in that case. We should never have to deliver a data 4973 * frame to multiple interfaces anyway. 4974 * 4975 * We skip the ieee80211_accept_frame() call and do the necessary 4976 * checking inside ieee80211_invoke_fast_rx(). 4977 */ 4978 if (consume && rx->sta) { 4979 struct ieee80211_fast_rx *fast_rx; 4980 4981 fast_rx = rcu_dereference(rx->sta->fast_rx); 4982 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 4983 return true; 4984 } 4985 4986 if (!ieee80211_accept_frame(rx)) 4987 return false; 4988 4989 if (!consume) { 4990 struct skb_shared_hwtstamps *shwt; 4991 4992 rx->skb = skb_copy(skb, GFP_ATOMIC); 4993 if (!rx->skb) { 4994 if (net_ratelimit()) 4995 wiphy_debug(local->hw.wiphy, 4996 "failed to copy skb for %s\n", 4997 sdata->name); 4998 return true; 4999 } 5000 5001 /* skb_copy() does not copy the hw timestamps, so copy it 5002 * explicitly 5003 */ 5004 shwt = skb_hwtstamps(rx->skb); 5005 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5006 5007 /* Update the hdr pointer to the new skb for translation below */ 5008 hdr = (struct ieee80211_hdr *)rx->skb->data; 5009 } 5010 5011 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5012 is_unicast_ether_addr(hdr->addr1) && 5013 !ieee80211_is_probe_resp(hdr->frame_control) && 5014 !ieee80211_is_beacon(hdr->frame_control)) { 5015 /* translate to MLD addresses */ 5016 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5017 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5018 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5019 ether_addr_copy(hdr->addr2, rx->sta->addr); 5020 /* translate A3 only if it's the BSSID */ 5021 if (!ieee80211_has_tods(hdr->frame_control) && 5022 !ieee80211_has_fromds(hdr->frame_control)) { 5023 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5024 ether_addr_copy(hdr->addr3, rx->sta->addr); 5025 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5026 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5027 } 5028 /* not needed for A4 since it can only carry the SA */ 5029 } 5030 5031 ieee80211_invoke_rx_handlers(rx); 5032 return true; 5033 } 5034 5035 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5036 struct ieee80211_sta *pubsta, 5037 struct sk_buff *skb, 5038 struct list_head *list) 5039 { 5040 struct ieee80211_local *local = hw_to_local(hw); 5041 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5042 struct ieee80211_fast_rx *fast_rx; 5043 struct ieee80211_rx_data rx; 5044 struct sta_info *sta; 5045 int link_id = -1; 5046 5047 memset(&rx, 0, sizeof(rx)); 5048 rx.skb = skb; 5049 rx.local = local; 5050 rx.list = list; 5051 rx.link_id = -1; 5052 5053 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5054 5055 /* drop frame if too short for header */ 5056 if (skb->len < sizeof(struct ethhdr)) 5057 goto drop; 5058 5059 if (!pubsta) 5060 goto drop; 5061 5062 if (status->link_valid) 5063 link_id = status->link_id; 5064 5065 /* 5066 * TODO: Should the frame be dropped if the right link_id is not 5067 * available? Or may be it is fine in the current form to proceed with 5068 * the frame processing because with frame being in 802.3 format, 5069 * link_id is used only for stats purpose and updating the stats on 5070 * the deflink is fine? 5071 */ 5072 sta = container_of(pubsta, struct sta_info, sta); 5073 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5074 goto drop; 5075 5076 fast_rx = rcu_dereference(rx.sta->fast_rx); 5077 if (!fast_rx) 5078 goto drop; 5079 5080 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5081 return; 5082 5083 drop: 5084 dev_kfree_skb(skb); 5085 } 5086 5087 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5088 struct sk_buff *skb, bool consume) 5089 { 5090 struct link_sta_info *link_sta; 5091 struct ieee80211_hdr *hdr = (void *)skb->data; 5092 struct sta_info *sta; 5093 int link_id = -1; 5094 5095 /* 5096 * Look up link station first, in case there's a 5097 * chance that they might have a link address that 5098 * is identical to the MLD address, that way we'll 5099 * have the link information if needed. 5100 */ 5101 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5102 if (link_sta) { 5103 sta = link_sta->sta; 5104 link_id = link_sta->link_id; 5105 } else { 5106 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5107 5108 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5109 if (status->link_valid) { 5110 link_id = status->link_id; 5111 } else if (ieee80211_vif_is_mld(&rx->sdata->vif) && 5112 status->freq) { 5113 struct ieee80211_link_data *link; 5114 struct ieee80211_chanctx_conf *conf; 5115 5116 for_each_link_data_rcu(rx->sdata, link) { 5117 conf = rcu_dereference(link->conf->chanctx_conf); 5118 if (!conf || !conf->def.chan) 5119 continue; 5120 5121 if (status->freq == conf->def.chan->center_freq) { 5122 link_id = link->link_id; 5123 break; 5124 } 5125 } 5126 } 5127 } 5128 5129 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5130 return false; 5131 5132 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5133 } 5134 5135 /* 5136 * This is the actual Rx frames handler. as it belongs to Rx path it must 5137 * be called with rcu_read_lock protection. 5138 */ 5139 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5140 struct ieee80211_sta *pubsta, 5141 struct sk_buff *skb, 5142 struct list_head *list) 5143 { 5144 struct ieee80211_local *local = hw_to_local(hw); 5145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5146 struct ieee80211_sub_if_data *sdata; 5147 struct ieee80211_hdr *hdr; 5148 __le16 fc; 5149 struct ieee80211_rx_data rx; 5150 struct ieee80211_sub_if_data *prev; 5151 struct rhlist_head *tmp; 5152 int err = 0; 5153 5154 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5155 memset(&rx, 0, sizeof(rx)); 5156 rx.skb = skb; 5157 rx.local = local; 5158 rx.list = list; 5159 rx.link_id = -1; 5160 5161 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5162 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5163 5164 if (ieee80211_is_mgmt(fc)) { 5165 /* drop frame if too short for header */ 5166 if (skb->len < ieee80211_hdrlen(fc)) 5167 err = -ENOBUFS; 5168 else 5169 err = skb_linearize(skb); 5170 } else { 5171 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5172 } 5173 5174 if (err) { 5175 dev_kfree_skb(skb); 5176 return; 5177 } 5178 5179 hdr = (struct ieee80211_hdr *)skb->data; 5180 ieee80211_parse_qos(&rx); 5181 ieee80211_verify_alignment(&rx); 5182 5183 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5184 ieee80211_is_beacon(hdr->frame_control) || 5185 ieee80211_is_s1g_beacon(hdr->frame_control))) 5186 ieee80211_scan_rx(local, skb); 5187 5188 if (ieee80211_is_data(fc)) { 5189 struct sta_info *sta, *prev_sta; 5190 int link_id = -1; 5191 5192 if (status->link_valid) 5193 link_id = status->link_id; 5194 5195 if (pubsta) { 5196 sta = container_of(pubsta, struct sta_info, sta); 5197 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5198 goto out; 5199 5200 /* 5201 * In MLO connection, fetch the link_id using addr2 5202 * when the driver does not pass link_id in status. 5203 * When the address translation is already performed by 5204 * driver/hw, the valid link_id must be passed in 5205 * status. 5206 */ 5207 5208 if (!status->link_valid && pubsta->mlo) { 5209 struct link_sta_info *link_sta; 5210 5211 link_sta = link_sta_info_get_bss(rx.sdata, 5212 hdr->addr2); 5213 if (!link_sta) 5214 goto out; 5215 5216 ieee80211_rx_data_set_link(&rx, link_sta->link_id); 5217 } 5218 5219 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5220 return; 5221 goto out; 5222 } 5223 5224 prev_sta = NULL; 5225 5226 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5227 if (!prev_sta) { 5228 prev_sta = sta; 5229 continue; 5230 } 5231 5232 rx.sdata = prev_sta->sdata; 5233 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5234 goto out; 5235 5236 if (!status->link_valid && prev_sta->sta.mlo) 5237 continue; 5238 5239 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5240 5241 prev_sta = sta; 5242 } 5243 5244 if (prev_sta) { 5245 rx.sdata = prev_sta->sdata; 5246 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5247 goto out; 5248 5249 if (!status->link_valid && prev_sta->sta.mlo) 5250 goto out; 5251 5252 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5253 return; 5254 goto out; 5255 } 5256 } 5257 5258 prev = NULL; 5259 5260 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5261 if (!ieee80211_sdata_running(sdata)) 5262 continue; 5263 5264 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5265 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5266 continue; 5267 5268 /* 5269 * frame is destined for this interface, but if it's 5270 * not also for the previous one we handle that after 5271 * the loop to avoid copying the SKB once too much 5272 */ 5273 5274 if (!prev) { 5275 prev = sdata; 5276 continue; 5277 } 5278 5279 rx.sdata = prev; 5280 ieee80211_rx_for_interface(&rx, skb, false); 5281 5282 prev = sdata; 5283 } 5284 5285 if (prev) { 5286 rx.sdata = prev; 5287 5288 if (ieee80211_rx_for_interface(&rx, skb, true)) 5289 return; 5290 } 5291 5292 out: 5293 dev_kfree_skb(skb); 5294 } 5295 5296 /* 5297 * This is the receive path handler. It is called by a low level driver when an 5298 * 802.11 MPDU is received from the hardware. 5299 */ 5300 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5301 struct sk_buff *skb, struct list_head *list) 5302 { 5303 struct ieee80211_local *local = hw_to_local(hw); 5304 struct ieee80211_rate *rate = NULL; 5305 struct ieee80211_supported_band *sband; 5306 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5307 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5308 5309 WARN_ON_ONCE(softirq_count() == 0); 5310 5311 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5312 goto drop; 5313 5314 sband = local->hw.wiphy->bands[status->band]; 5315 if (WARN_ON(!sband)) 5316 goto drop; 5317 5318 /* 5319 * If we're suspending, it is possible although not too likely 5320 * that we'd be receiving frames after having already partially 5321 * quiesced the stack. We can't process such frames then since 5322 * that might, for example, cause stations to be added or other 5323 * driver callbacks be invoked. 5324 */ 5325 if (unlikely(local->quiescing || local->suspended)) 5326 goto drop; 5327 5328 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5329 if (unlikely(local->in_reconfig)) 5330 goto drop; 5331 5332 /* 5333 * The same happens when we're not even started, 5334 * but that's worth a warning. 5335 */ 5336 if (WARN_ON(!local->started)) 5337 goto drop; 5338 5339 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 5340 /* 5341 * Validate the rate, unless a PLCP error means that 5342 * we probably can't have a valid rate here anyway. 5343 */ 5344 5345 switch (status->encoding) { 5346 case RX_ENC_HT: 5347 /* 5348 * rate_idx is MCS index, which can be [0-76] 5349 * as documented on: 5350 * 5351 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5352 * 5353 * Anything else would be some sort of driver or 5354 * hardware error. The driver should catch hardware 5355 * errors. 5356 */ 5357 if (WARN(status->rate_idx > 76, 5358 "Rate marked as an HT rate but passed " 5359 "status->rate_idx is not " 5360 "an MCS index [0-76]: %d (0x%02x)\n", 5361 status->rate_idx, 5362 status->rate_idx)) 5363 goto drop; 5364 break; 5365 case RX_ENC_VHT: 5366 if (WARN_ONCE(status->rate_idx > 11 || 5367 !status->nss || 5368 status->nss > 8, 5369 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5370 status->rate_idx, status->nss)) 5371 goto drop; 5372 break; 5373 case RX_ENC_HE: 5374 if (WARN_ONCE(status->rate_idx > 11 || 5375 !status->nss || 5376 status->nss > 8, 5377 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5378 status->rate_idx, status->nss)) 5379 goto drop; 5380 break; 5381 case RX_ENC_EHT: 5382 if (WARN_ONCE(status->rate_idx > 15 || 5383 !status->nss || 5384 status->nss > 8 || 5385 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5386 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5387 status->rate_idx, status->nss, status->eht.gi)) 5388 goto drop; 5389 break; 5390 default: 5391 WARN_ON_ONCE(1); 5392 fallthrough; 5393 case RX_ENC_LEGACY: 5394 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5395 goto drop; 5396 rate = &sband->bitrates[status->rate_idx]; 5397 } 5398 } 5399 5400 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5401 goto drop; 5402 5403 status->rx_flags = 0; 5404 5405 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5406 5407 /* 5408 * Frames with failed FCS/PLCP checksum are not returned, 5409 * all other frames are returned without radiotap header 5410 * if it was previously present. 5411 * Also, frames with less than 16 bytes are dropped. 5412 */ 5413 if (!(status->flag & RX_FLAG_8023)) 5414 skb = ieee80211_rx_monitor(local, skb, rate); 5415 if (skb) { 5416 if ((status->flag & RX_FLAG_8023) || 5417 ieee80211_is_data_present(hdr->frame_control)) 5418 ieee80211_tpt_led_trig_rx(local, skb->len); 5419 5420 if (status->flag & RX_FLAG_8023) 5421 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5422 else 5423 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5424 } 5425 5426 kcov_remote_stop(); 5427 return; 5428 drop: 5429 kfree_skb(skb); 5430 } 5431 EXPORT_SYMBOL(ieee80211_rx_list); 5432 5433 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5434 struct sk_buff *skb, struct napi_struct *napi) 5435 { 5436 struct sk_buff *tmp; 5437 LIST_HEAD(list); 5438 5439 5440 /* 5441 * key references and virtual interfaces are protected using RCU 5442 * and this requires that we are in a read-side RCU section during 5443 * receive processing 5444 */ 5445 rcu_read_lock(); 5446 ieee80211_rx_list(hw, pubsta, skb, &list); 5447 rcu_read_unlock(); 5448 5449 if (!napi) { 5450 netif_receive_skb_list(&list); 5451 return; 5452 } 5453 5454 list_for_each_entry_safe(skb, tmp, &list, list) { 5455 skb_list_del_init(skb); 5456 napi_gro_receive(napi, skb); 5457 } 5458 } 5459 EXPORT_SYMBOL(ieee80211_rx_napi); 5460 5461 /* This is a version of the rx handler that can be called from hard irq 5462 * context. Post the skb on the queue and schedule the tasklet */ 5463 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5464 { 5465 struct ieee80211_local *local = hw_to_local(hw); 5466 5467 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5468 5469 skb->pkt_type = IEEE80211_RX_MSG; 5470 skb_queue_tail(&local->skb_queue, skb); 5471 tasklet_schedule(&local->tasklet); 5472 } 5473 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5474