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, 1536 hdr->addr2, 1537 GFP_ATOMIC)) 1538 return RX_DROP_U_SPURIOUS; 1539 1540 return RX_DROP; 1541 } 1542 1543 return RX_CONTINUE; 1544 } 1545 1546 1547 static ieee80211_rx_result debug_noinline 1548 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1549 { 1550 struct ieee80211_local *local; 1551 struct ieee80211_hdr *hdr; 1552 struct sk_buff *skb; 1553 1554 local = rx->local; 1555 skb = rx->skb; 1556 hdr = (struct ieee80211_hdr *) skb->data; 1557 1558 if (!local->pspolling) 1559 return RX_CONTINUE; 1560 1561 if (!ieee80211_has_fromds(hdr->frame_control)) 1562 /* this is not from AP */ 1563 return RX_CONTINUE; 1564 1565 if (!ieee80211_is_data(hdr->frame_control)) 1566 return RX_CONTINUE; 1567 1568 if (!ieee80211_has_moredata(hdr->frame_control)) { 1569 /* AP has no more frames buffered for us */ 1570 local->pspolling = false; 1571 return RX_CONTINUE; 1572 } 1573 1574 /* more data bit is set, let's request a new frame from the AP */ 1575 ieee80211_send_pspoll(local, rx->sdata); 1576 1577 return RX_CONTINUE; 1578 } 1579 1580 static void sta_ps_start(struct sta_info *sta) 1581 { 1582 struct ieee80211_sub_if_data *sdata = sta->sdata; 1583 struct ieee80211_local *local = sdata->local; 1584 struct ps_data *ps; 1585 int tid; 1586 1587 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1588 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1589 ps = &sdata->bss->ps; 1590 else 1591 return; 1592 1593 atomic_inc(&ps->num_sta_ps); 1594 set_sta_flag(sta, WLAN_STA_PS_STA); 1595 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1596 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1597 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1598 sta->sta.addr, sta->sta.aid); 1599 1600 ieee80211_clear_fast_xmit(sta); 1601 1602 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1603 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1604 struct txq_info *txqi = to_txq_info(txq); 1605 1606 spin_lock(&local->active_txq_lock[txq->ac]); 1607 if (!list_empty(&txqi->schedule_order)) 1608 list_del_init(&txqi->schedule_order); 1609 spin_unlock(&local->active_txq_lock[txq->ac]); 1610 1611 if (txq_has_queue(txq)) 1612 set_bit(tid, &sta->txq_buffered_tids); 1613 else 1614 clear_bit(tid, &sta->txq_buffered_tids); 1615 } 1616 } 1617 1618 static void sta_ps_end(struct sta_info *sta) 1619 { 1620 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1621 sta->sta.addr, sta->sta.aid); 1622 1623 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1624 /* 1625 * Clear the flag only if the other one is still set 1626 * so that the TX path won't start TX'ing new frames 1627 * directly ... In the case that the driver flag isn't 1628 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1629 */ 1630 clear_sta_flag(sta, WLAN_STA_PS_STA); 1631 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1632 sta->sta.addr, sta->sta.aid); 1633 return; 1634 } 1635 1636 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1637 clear_sta_flag(sta, WLAN_STA_PS_STA); 1638 ieee80211_sta_ps_deliver_wakeup(sta); 1639 } 1640 1641 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1642 { 1643 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1644 bool in_ps; 1645 1646 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1647 1648 /* Don't let the same PS state be set twice */ 1649 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1650 if ((start && in_ps) || (!start && !in_ps)) 1651 return -EINVAL; 1652 1653 if (start) 1654 sta_ps_start(sta); 1655 else 1656 sta_ps_end(sta); 1657 1658 return 0; 1659 } 1660 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1661 1662 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1663 { 1664 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1665 1666 if (test_sta_flag(sta, WLAN_STA_SP)) 1667 return; 1668 1669 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1670 ieee80211_sta_ps_deliver_poll_response(sta); 1671 else 1672 set_sta_flag(sta, WLAN_STA_PSPOLL); 1673 } 1674 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1675 1676 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1677 { 1678 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1679 int ac = ieee80211_ac_from_tid(tid); 1680 1681 /* 1682 * If this AC is not trigger-enabled do nothing unless the 1683 * driver is calling us after it already checked. 1684 * 1685 * NB: This could/should check a separate bitmap of trigger- 1686 * enabled queues, but for now we only implement uAPSD w/o 1687 * TSPEC changes to the ACs, so they're always the same. 1688 */ 1689 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1690 tid != IEEE80211_NUM_TIDS) 1691 return; 1692 1693 /* if we are in a service period, do nothing */ 1694 if (test_sta_flag(sta, WLAN_STA_SP)) 1695 return; 1696 1697 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1698 ieee80211_sta_ps_deliver_uapsd(sta); 1699 else 1700 set_sta_flag(sta, WLAN_STA_UAPSD); 1701 } 1702 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1703 1704 static ieee80211_rx_result debug_noinline 1705 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1706 { 1707 struct ieee80211_sub_if_data *sdata = rx->sdata; 1708 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1709 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1710 1711 if (!rx->sta) 1712 return RX_CONTINUE; 1713 1714 if (sdata->vif.type != NL80211_IFTYPE_AP && 1715 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1716 return RX_CONTINUE; 1717 1718 /* 1719 * The device handles station powersave, so don't do anything about 1720 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1721 * it to mac80211 since they're handled.) 1722 */ 1723 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1724 return RX_CONTINUE; 1725 1726 /* 1727 * Don't do anything if the station isn't already asleep. In 1728 * the uAPSD case, the station will probably be marked asleep, 1729 * in the PS-Poll case the station must be confused ... 1730 */ 1731 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1732 return RX_CONTINUE; 1733 1734 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1735 ieee80211_sta_pspoll(&rx->sta->sta); 1736 1737 /* Free PS Poll skb here instead of returning RX_DROP that would 1738 * count as an dropped frame. */ 1739 dev_kfree_skb(rx->skb); 1740 1741 return RX_QUEUED; 1742 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1743 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1744 ieee80211_has_pm(hdr->frame_control) && 1745 (ieee80211_is_data_qos(hdr->frame_control) || 1746 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1747 u8 tid = ieee80211_get_tid(hdr); 1748 1749 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1750 } 1751 1752 return RX_CONTINUE; 1753 } 1754 1755 static ieee80211_rx_result debug_noinline 1756 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1757 { 1758 struct sta_info *sta = rx->sta; 1759 struct link_sta_info *link_sta = rx->link_sta; 1760 struct sk_buff *skb = rx->skb; 1761 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1763 int i; 1764 1765 if (!sta || !link_sta) 1766 return RX_CONTINUE; 1767 1768 /* 1769 * Update last_rx only for IBSS packets which are for the current 1770 * BSSID and for station already AUTHORIZED to avoid keeping the 1771 * current IBSS network alive in cases where other STAs start 1772 * using different BSSID. This will also give the station another 1773 * chance to restart the authentication/authorization in case 1774 * something went wrong the first time. 1775 */ 1776 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1777 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1778 NL80211_IFTYPE_ADHOC); 1779 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1780 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1781 link_sta->rx_stats.last_rx = jiffies; 1782 if (ieee80211_is_data_present(hdr->frame_control) && 1783 !is_multicast_ether_addr(hdr->addr1)) 1784 link_sta->rx_stats.last_rate = 1785 sta_stats_encode_rate(status); 1786 } 1787 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1788 link_sta->rx_stats.last_rx = jiffies; 1789 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1790 !is_multicast_ether_addr(hdr->addr1)) { 1791 /* 1792 * Mesh beacons will update last_rx when if they are found to 1793 * match the current local configuration when processed. 1794 */ 1795 link_sta->rx_stats.last_rx = jiffies; 1796 if (ieee80211_is_data_present(hdr->frame_control)) 1797 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1798 } 1799 1800 link_sta->rx_stats.fragments++; 1801 1802 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1803 link_sta->rx_stats.bytes += rx->skb->len; 1804 u64_stats_update_end(&link_sta->rx_stats.syncp); 1805 1806 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1807 link_sta->rx_stats.last_signal = status->signal; 1808 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1809 -status->signal); 1810 } 1811 1812 if (status->chains) { 1813 link_sta->rx_stats.chains = status->chains; 1814 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1815 int signal = status->chain_signal[i]; 1816 1817 if (!(status->chains & BIT(i))) 1818 continue; 1819 1820 link_sta->rx_stats.chain_signal_last[i] = signal; 1821 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1822 -signal); 1823 } 1824 } 1825 1826 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1827 return RX_CONTINUE; 1828 1829 /* 1830 * Change STA power saving mode only at the end of a frame 1831 * exchange sequence, and only for a data or management 1832 * frame as specified in IEEE 802.11-2016 11.2.3.2 1833 */ 1834 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1835 !ieee80211_has_morefrags(hdr->frame_control) && 1836 !is_multicast_ether_addr(hdr->addr1) && 1837 (ieee80211_is_mgmt(hdr->frame_control) || 1838 ieee80211_is_data(hdr->frame_control)) && 1839 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1840 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1841 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1842 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1843 if (!ieee80211_has_pm(hdr->frame_control)) 1844 sta_ps_end(sta); 1845 } else { 1846 if (ieee80211_has_pm(hdr->frame_control)) 1847 sta_ps_start(sta); 1848 } 1849 } 1850 1851 /* mesh power save support */ 1852 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1853 ieee80211_mps_rx_h_sta_process(sta, hdr); 1854 1855 /* 1856 * Drop (qos-)data::nullfunc frames silently, since they 1857 * are used only to control station power saving mode. 1858 */ 1859 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1860 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1861 1862 /* 1863 * If we receive a 4-addr nullfunc frame from a STA 1864 * that was not moved to a 4-addr STA vlan yet send 1865 * the event to userspace and for older hostapd drop 1866 * the frame to the monitor interface. 1867 */ 1868 if (ieee80211_has_a4(hdr->frame_control) && 1869 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1870 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1871 !rx->sdata->u.vlan.sta))) { 1872 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1873 cfg80211_rx_unexpected_4addr_frame( 1874 rx->sdata->dev, sta->sta.addr, 1875 GFP_ATOMIC); 1876 return RX_DROP_U_UNEXPECTED_4ADDR_FRAME; 1877 } 1878 /* 1879 * Update counter and free packet here to avoid 1880 * counting this as a dropped packed. 1881 */ 1882 link_sta->rx_stats.packets++; 1883 dev_kfree_skb(rx->skb); 1884 return RX_QUEUED; 1885 } 1886 1887 return RX_CONTINUE; 1888 } /* ieee80211_rx_h_sta_process */ 1889 1890 static struct ieee80211_key * 1891 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1892 { 1893 struct ieee80211_key *key = NULL; 1894 int idx2; 1895 1896 /* Make sure key gets set if either BIGTK key index is set so that 1897 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1898 * Beacon frames and Beacon frames that claim to use another BIGTK key 1899 * index (i.e., a key that we do not have). 1900 */ 1901 1902 if (idx < 0) { 1903 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 1904 idx2 = idx + 1; 1905 } else { 1906 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1907 idx2 = idx + 1; 1908 else 1909 idx2 = idx - 1; 1910 } 1911 1912 if (rx->link_sta) 1913 key = rcu_dereference(rx->link_sta->gtk[idx]); 1914 if (!key) 1915 key = rcu_dereference(rx->link->gtk[idx]); 1916 if (!key && rx->link_sta) 1917 key = rcu_dereference(rx->link_sta->gtk[idx2]); 1918 if (!key) 1919 key = rcu_dereference(rx->link->gtk[idx2]); 1920 1921 return key; 1922 } 1923 1924 static ieee80211_rx_result debug_noinline 1925 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1926 { 1927 struct sk_buff *skb = rx->skb; 1928 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1929 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1930 int keyidx; 1931 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 1932 struct ieee80211_key *sta_ptk = NULL; 1933 struct ieee80211_key *ptk_idx = NULL; 1934 int mmie_keyidx = -1; 1935 __le16 fc; 1936 1937 if (ieee80211_is_ext(hdr->frame_control)) 1938 return RX_CONTINUE; 1939 1940 /* 1941 * Key selection 101 1942 * 1943 * There are five types of keys: 1944 * - GTK (group keys) 1945 * - IGTK (group keys for management frames) 1946 * - BIGTK (group keys for Beacon frames) 1947 * - PTK (pairwise keys) 1948 * - STK (station-to-station pairwise keys) 1949 * 1950 * When selecting a key, we have to distinguish between multicast 1951 * (including broadcast) and unicast frames, the latter can only 1952 * use PTKs and STKs while the former always use GTKs, IGTKs, and 1953 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 1954 * then unicast frames can also use key indices like GTKs. Hence, if we 1955 * don't have a PTK/STK we check the key index for a WEP key. 1956 * 1957 * Note that in a regular BSS, multicast frames are sent by the 1958 * AP only, associated stations unicast the frame to the AP first 1959 * which then multicasts it on their behalf. 1960 * 1961 * There is also a slight problem in IBSS mode: GTKs are negotiated 1962 * with each station, that is something we don't currently handle. 1963 * The spec seems to expect that one negotiates the same key with 1964 * every station but there's no such requirement; VLANs could be 1965 * possible. 1966 */ 1967 1968 /* start without a key */ 1969 rx->key = NULL; 1970 fc = hdr->frame_control; 1971 1972 if (rx->sta) { 1973 int keyid = rx->sta->ptk_idx; 1974 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1975 1976 if (ieee80211_has_protected(fc) && 1977 !(status->flag & RX_FLAG_IV_STRIPPED)) { 1978 keyid = ieee80211_get_keyid(rx->skb); 1979 1980 if (unlikely(keyid < 0)) 1981 return RX_DROP_U_NO_KEY_ID; 1982 1983 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 1984 } 1985 } 1986 1987 if (!ieee80211_has_protected(fc)) 1988 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1989 1990 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1991 rx->key = ptk_idx ? ptk_idx : sta_ptk; 1992 if ((status->flag & RX_FLAG_DECRYPTED) && 1993 (status->flag & RX_FLAG_IV_STRIPPED)) 1994 return RX_CONTINUE; 1995 /* Skip decryption if the frame is not protected. */ 1996 if (!ieee80211_has_protected(fc)) 1997 return RX_CONTINUE; 1998 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 1999 /* Broadcast/multicast robust management frame / BIP */ 2000 if ((status->flag & RX_FLAG_DECRYPTED) && 2001 (status->flag & RX_FLAG_IV_STRIPPED)) 2002 return RX_CONTINUE; 2003 2004 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 2005 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 2006 NUM_DEFAULT_BEACON_KEYS) { 2007 if (rx->sdata->dev) 2008 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2009 skb->data, 2010 skb->len); 2011 return RX_DROP_U_BAD_BCN_KEYIDX; 2012 } 2013 2014 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2015 if (!rx->key) 2016 return RX_CONTINUE; /* Beacon protection not in use */ 2017 } else if (mmie_keyidx >= 0) { 2018 /* Broadcast/multicast robust management frame / BIP */ 2019 if ((status->flag & RX_FLAG_DECRYPTED) && 2020 (status->flag & RX_FLAG_IV_STRIPPED)) 2021 return RX_CONTINUE; 2022 2023 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2024 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2025 return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2026 if (rx->link_sta) { 2027 if (ieee80211_is_group_privacy_action(skb) && 2028 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2029 return RX_DROP; 2030 2031 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2032 } 2033 if (!rx->key) 2034 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2035 } else if (!ieee80211_has_protected(fc)) { 2036 /* 2037 * The frame was not protected, so skip decryption. However, we 2038 * need to set rx->key if there is a key that could have been 2039 * used so that the frame may be dropped if encryption would 2040 * have been expected. 2041 */ 2042 struct ieee80211_key *key = NULL; 2043 int i; 2044 2045 if (ieee80211_is_beacon(fc)) { 2046 key = ieee80211_rx_get_bigtk(rx, -1); 2047 } else if (ieee80211_is_mgmt(fc) && 2048 is_multicast_ether_addr(hdr->addr1)) { 2049 key = rcu_dereference(rx->link->default_mgmt_key); 2050 } else { 2051 if (rx->link_sta) { 2052 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2053 key = rcu_dereference(rx->link_sta->gtk[i]); 2054 if (key) 2055 break; 2056 } 2057 } 2058 if (!key) { 2059 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2060 key = rcu_dereference(rx->link->gtk[i]); 2061 if (key) 2062 break; 2063 } 2064 } 2065 } 2066 if (key) 2067 rx->key = key; 2068 return RX_CONTINUE; 2069 } else { 2070 /* 2071 * The device doesn't give us the IV so we won't be 2072 * able to look up the key. That's ok though, we 2073 * don't need to decrypt the frame, we just won't 2074 * be able to keep statistics accurate. 2075 * Except for key threshold notifications, should 2076 * we somehow allow the driver to tell us which key 2077 * the hardware used if this flag is set? 2078 */ 2079 if ((status->flag & RX_FLAG_DECRYPTED) && 2080 (status->flag & RX_FLAG_IV_STRIPPED)) 2081 return RX_CONTINUE; 2082 2083 keyidx = ieee80211_get_keyid(rx->skb); 2084 2085 if (unlikely(keyidx < 0)) 2086 return RX_DROP_U_NO_KEY_ID; 2087 2088 /* check per-station GTK first, if multicast packet */ 2089 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2090 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2091 2092 /* if not found, try default key */ 2093 if (!rx->key) { 2094 if (is_multicast_ether_addr(hdr->addr1)) 2095 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2096 if (!rx->key) 2097 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2098 2099 /* 2100 * RSNA-protected unicast frames should always be 2101 * sent with pairwise or station-to-station keys, 2102 * but for WEP we allow using a key index as well. 2103 */ 2104 if (rx->key && 2105 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2106 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2107 !is_multicast_ether_addr(hdr->addr1)) 2108 rx->key = NULL; 2109 } 2110 } 2111 2112 if (rx->key) { 2113 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2114 return RX_DROP; 2115 2116 /* TODO: add threshold stuff again */ 2117 } else { 2118 return RX_DROP; 2119 } 2120 2121 switch (rx->key->conf.cipher) { 2122 case WLAN_CIPHER_SUITE_WEP40: 2123 case WLAN_CIPHER_SUITE_WEP104: 2124 result = ieee80211_crypto_wep_decrypt(rx); 2125 break; 2126 case WLAN_CIPHER_SUITE_TKIP: 2127 result = ieee80211_crypto_tkip_decrypt(rx); 2128 break; 2129 case WLAN_CIPHER_SUITE_CCMP: 2130 result = ieee80211_crypto_ccmp_decrypt( 2131 rx, IEEE80211_CCMP_MIC_LEN); 2132 break; 2133 case WLAN_CIPHER_SUITE_CCMP_256: 2134 result = ieee80211_crypto_ccmp_decrypt( 2135 rx, IEEE80211_CCMP_256_MIC_LEN); 2136 break; 2137 case WLAN_CIPHER_SUITE_AES_CMAC: 2138 result = ieee80211_crypto_aes_cmac_decrypt(rx); 2139 break; 2140 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2141 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 2142 break; 2143 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2144 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2145 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2146 break; 2147 case WLAN_CIPHER_SUITE_GCMP: 2148 case WLAN_CIPHER_SUITE_GCMP_256: 2149 result = ieee80211_crypto_gcmp_decrypt(rx); 2150 break; 2151 default: 2152 result = RX_DROP_U_BAD_CIPHER; 2153 } 2154 2155 /* the hdr variable is invalid after the decrypt handlers */ 2156 2157 /* either the frame has been decrypted or will be dropped */ 2158 status->flag |= RX_FLAG_DECRYPTED; 2159 2160 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2161 rx->sdata->dev)) 2162 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2163 skb->data, skb->len); 2164 2165 return result; 2166 } 2167 2168 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2169 { 2170 int i; 2171 2172 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2173 skb_queue_head_init(&cache->entries[i].skb_list); 2174 } 2175 2176 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2177 { 2178 int i; 2179 2180 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2181 __skb_queue_purge(&cache->entries[i].skb_list); 2182 } 2183 2184 static inline struct ieee80211_fragment_entry * 2185 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2186 unsigned int frag, unsigned int seq, int rx_queue, 2187 struct sk_buff **skb) 2188 { 2189 struct ieee80211_fragment_entry *entry; 2190 2191 entry = &cache->entries[cache->next++]; 2192 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2193 cache->next = 0; 2194 2195 __skb_queue_purge(&entry->skb_list); 2196 2197 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2198 *skb = NULL; 2199 entry->first_frag_time = jiffies; 2200 entry->seq = seq; 2201 entry->rx_queue = rx_queue; 2202 entry->last_frag = frag; 2203 entry->check_sequential_pn = false; 2204 entry->extra_len = 0; 2205 2206 return entry; 2207 } 2208 2209 static inline struct ieee80211_fragment_entry * 2210 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2211 unsigned int frag, unsigned int seq, 2212 int rx_queue, struct ieee80211_hdr *hdr) 2213 { 2214 struct ieee80211_fragment_entry *entry; 2215 int i, idx; 2216 2217 idx = cache->next; 2218 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2219 struct ieee80211_hdr *f_hdr; 2220 struct sk_buff *f_skb; 2221 2222 idx--; 2223 if (idx < 0) 2224 idx = IEEE80211_FRAGMENT_MAX - 1; 2225 2226 entry = &cache->entries[idx]; 2227 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2228 entry->rx_queue != rx_queue || 2229 entry->last_frag + 1 != frag) 2230 continue; 2231 2232 f_skb = __skb_peek(&entry->skb_list); 2233 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2234 2235 /* 2236 * Check ftype and addresses are equal, else check next fragment 2237 */ 2238 if (((hdr->frame_control ^ f_hdr->frame_control) & 2239 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2240 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2241 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2242 continue; 2243 2244 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2245 __skb_queue_purge(&entry->skb_list); 2246 continue; 2247 } 2248 return entry; 2249 } 2250 2251 return NULL; 2252 } 2253 2254 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2255 { 2256 return rx->key && 2257 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2258 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2259 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2260 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2261 ieee80211_has_protected(fc); 2262 } 2263 2264 static ieee80211_rx_result debug_noinline 2265 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2266 { 2267 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2268 struct ieee80211_hdr *hdr; 2269 u16 sc; 2270 __le16 fc; 2271 unsigned int frag, seq; 2272 struct ieee80211_fragment_entry *entry; 2273 struct sk_buff *skb; 2274 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2275 2276 hdr = (struct ieee80211_hdr *)rx->skb->data; 2277 fc = hdr->frame_control; 2278 2279 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2280 return RX_CONTINUE; 2281 2282 sc = le16_to_cpu(hdr->seq_ctrl); 2283 frag = sc & IEEE80211_SCTL_FRAG; 2284 2285 if (rx->sta) 2286 cache = &rx->sta->frags; 2287 2288 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2289 goto out; 2290 2291 if (is_multicast_ether_addr(hdr->addr1)) 2292 return RX_DROP; 2293 2294 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2295 2296 if (skb_linearize(rx->skb)) 2297 return RX_DROP_U_OOM; 2298 2299 /* 2300 * skb_linearize() might change the skb->data and 2301 * previously cached variables (in this case, hdr) need to 2302 * be refreshed with the new data. 2303 */ 2304 hdr = (struct ieee80211_hdr *)rx->skb->data; 2305 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2306 2307 if (frag == 0) { 2308 /* This is the first fragment of a new frame. */ 2309 entry = ieee80211_reassemble_add(cache, frag, seq, 2310 rx->seqno_idx, &(rx->skb)); 2311 if (requires_sequential_pn(rx, fc)) { 2312 int queue = rx->security_idx; 2313 2314 /* Store CCMP/GCMP PN so that we can verify that the 2315 * next fragment has a sequential PN value. 2316 */ 2317 entry->check_sequential_pn = true; 2318 entry->is_protected = true; 2319 entry->key_color = rx->key->color; 2320 memcpy(entry->last_pn, 2321 rx->key->u.ccmp.rx_pn[queue], 2322 IEEE80211_CCMP_PN_LEN); 2323 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2324 u.ccmp.rx_pn) != 2325 offsetof(struct ieee80211_key, 2326 u.gcmp.rx_pn)); 2327 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2328 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2329 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2330 IEEE80211_GCMP_PN_LEN); 2331 } else if (rx->key && 2332 (ieee80211_has_protected(fc) || 2333 (status->flag & RX_FLAG_DECRYPTED))) { 2334 entry->is_protected = true; 2335 entry->key_color = rx->key->color; 2336 } 2337 return RX_QUEUED; 2338 } 2339 2340 /* This is a fragment for a frame that should already be pending in 2341 * fragment cache. Add this fragment to the end of the pending entry. 2342 */ 2343 entry = ieee80211_reassemble_find(cache, frag, seq, 2344 rx->seqno_idx, hdr); 2345 if (!entry) { 2346 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2347 return RX_DROP; 2348 } 2349 2350 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2351 * MPDU PN values are not incrementing in steps of 1." 2352 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2353 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2354 */ 2355 if (entry->check_sequential_pn) { 2356 int i; 2357 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2358 2359 if (!requires_sequential_pn(rx, fc)) 2360 return RX_DROP_U_NONSEQ_PN; 2361 2362 /* Prevent mixed key and fragment cache attacks */ 2363 if (entry->key_color != rx->key->color) 2364 return RX_DROP_U_BAD_KEY_COLOR; 2365 2366 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2367 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2368 pn[i]++; 2369 if (pn[i]) 2370 break; 2371 } 2372 2373 rpn = rx->ccm_gcm.pn; 2374 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2375 return RX_DROP_U_REPLAY; 2376 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2377 } else if (entry->is_protected && 2378 (!rx->key || 2379 (!ieee80211_has_protected(fc) && 2380 !(status->flag & RX_FLAG_DECRYPTED)) || 2381 rx->key->color != entry->key_color)) { 2382 /* Drop this as a mixed key or fragment cache attack, even 2383 * if for TKIP Michael MIC should protect us, and WEP is a 2384 * lost cause anyway. 2385 */ 2386 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2387 } else if (entry->is_protected && rx->key && 2388 entry->key_color != rx->key->color && 2389 (status->flag & RX_FLAG_DECRYPTED)) { 2390 return RX_DROP_U_BAD_KEY_COLOR; 2391 } 2392 2393 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2394 __skb_queue_tail(&entry->skb_list, rx->skb); 2395 entry->last_frag = frag; 2396 entry->extra_len += rx->skb->len; 2397 if (ieee80211_has_morefrags(fc)) { 2398 rx->skb = NULL; 2399 return RX_QUEUED; 2400 } 2401 2402 rx->skb = __skb_dequeue(&entry->skb_list); 2403 if (skb_tailroom(rx->skb) < entry->extra_len) { 2404 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2405 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2406 GFP_ATOMIC))) { 2407 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2408 __skb_queue_purge(&entry->skb_list); 2409 return RX_DROP_U_OOM; 2410 } 2411 } 2412 while ((skb = __skb_dequeue(&entry->skb_list))) { 2413 skb_put_data(rx->skb, skb->data, skb->len); 2414 dev_kfree_skb(skb); 2415 } 2416 2417 out: 2418 ieee80211_led_rx(rx->local); 2419 if (rx->sta) 2420 rx->link_sta->rx_stats.packets++; 2421 return RX_CONTINUE; 2422 } 2423 2424 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2425 { 2426 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2427 return -EACCES; 2428 2429 return 0; 2430 } 2431 2432 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2433 { 2434 struct sk_buff *skb = rx->skb; 2435 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2436 2437 /* 2438 * Pass through unencrypted frames if the hardware has 2439 * decrypted them already. 2440 */ 2441 if (status->flag & RX_FLAG_DECRYPTED) 2442 return 0; 2443 2444 /* Drop unencrypted frames if key is set. */ 2445 if (unlikely(!ieee80211_has_protected(fc) && 2446 !ieee80211_is_any_nullfunc(fc) && 2447 ieee80211_is_data(fc) && rx->key)) 2448 return -EACCES; 2449 2450 return 0; 2451 } 2452 2453 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2454 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2455 { 2456 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2457 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2458 __le16 fc = mgmt->frame_control; 2459 2460 /* 2461 * Pass through unencrypted frames if the hardware has 2462 * decrypted them already. 2463 */ 2464 if (status->flag & RX_FLAG_DECRYPTED) 2465 return RX_CONTINUE; 2466 2467 /* drop unicast protected dual (that wasn't protected) */ 2468 if (ieee80211_is_action(fc) && 2469 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2470 return RX_DROP_U_UNPROT_DUAL; 2471 2472 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2473 if (unlikely(!ieee80211_has_protected(fc) && 2474 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2475 if (ieee80211_is_deauth(fc) || 2476 ieee80211_is_disassoc(fc)) { 2477 /* 2478 * Permit unprotected deauth/disassoc frames 2479 * during 4-way-HS (key is installed after HS). 2480 */ 2481 if (!rx->key) 2482 return RX_CONTINUE; 2483 2484 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2485 rx->skb->data, 2486 rx->skb->len); 2487 } 2488 return RX_DROP_U_UNPROT_UCAST_MGMT; 2489 } 2490 /* BIP does not use Protected field, so need to check MMIE */ 2491 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2492 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2493 if (ieee80211_is_deauth(fc) || 2494 ieee80211_is_disassoc(fc)) 2495 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2496 rx->skb->data, 2497 rx->skb->len); 2498 return RX_DROP_U_UNPROT_MCAST_MGMT; 2499 } 2500 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2501 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2502 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2503 rx->skb->data, 2504 rx->skb->len); 2505 return RX_DROP_U_UNPROT_BEACON; 2506 } 2507 /* 2508 * When using MFP, Action frames are not allowed prior to 2509 * having configured keys. 2510 */ 2511 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2512 ieee80211_is_robust_mgmt_frame(rx->skb))) 2513 return RX_DROP_U_UNPROT_ACTION; 2514 2515 /* drop unicast public action frames when using MPF */ 2516 if (is_unicast_ether_addr(mgmt->da) && 2517 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2518 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2519 } 2520 2521 /* 2522 * Drop robust action frames before assoc regardless of MFP state, 2523 * after assoc we also have decided on MFP or not. 2524 */ 2525 if (ieee80211_is_action(fc) && 2526 ieee80211_is_robust_mgmt_frame(rx->skb) && 2527 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2528 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2529 2530 return RX_CONTINUE; 2531 } 2532 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2533 2534 static ieee80211_rx_result 2535 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2536 { 2537 struct ieee80211_sub_if_data *sdata = rx->sdata; 2538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2539 bool check_port_control = false; 2540 struct ethhdr *ehdr; 2541 int ret; 2542 2543 *port_control = false; 2544 if (ieee80211_has_a4(hdr->frame_control) && 2545 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2546 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2547 2548 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2549 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2550 if (!sdata->u.mgd.use_4addr) 2551 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2552 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2553 check_port_control = true; 2554 } 2555 2556 if (is_multicast_ether_addr(hdr->addr1) && 2557 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2558 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2559 2560 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2561 if (ret < 0) 2562 return RX_DROP_U_INVALID_8023; 2563 2564 ehdr = (struct ethhdr *) rx->skb->data; 2565 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2566 *port_control = true; 2567 else if (check_port_control) 2568 return RX_DROP_U_NOT_PORT_CONTROL; 2569 2570 return RX_CONTINUE; 2571 } 2572 2573 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2574 const u8 *addr, int *out_link_id) 2575 { 2576 unsigned int link_id; 2577 2578 /* non-MLO, or MLD address replaced by hardware */ 2579 if (ether_addr_equal(sdata->vif.addr, addr)) 2580 return true; 2581 2582 if (!ieee80211_vif_is_mld(&sdata->vif)) 2583 return false; 2584 2585 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2586 struct ieee80211_bss_conf *conf; 2587 2588 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2589 2590 if (!conf) 2591 continue; 2592 if (ether_addr_equal(conf->addr, addr)) { 2593 if (out_link_id) 2594 *out_link_id = link_id; 2595 return true; 2596 } 2597 } 2598 2599 return false; 2600 } 2601 2602 /* 2603 * requires that rx->skb is a frame with ethernet header 2604 */ 2605 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2606 { 2607 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2608 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2609 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2610 2611 /* 2612 * Allow EAPOL frames to us/the PAE group address regardless of 2613 * whether the frame was encrypted or not, and always disallow 2614 * all other destination addresses for them. 2615 */ 2616 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2617 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2618 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2619 2620 if (ieee80211_802_1x_port_control(rx) || 2621 ieee80211_drop_unencrypted(rx, fc)) 2622 return false; 2623 2624 return true; 2625 } 2626 2627 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2628 struct ieee80211_rx_data *rx) 2629 { 2630 struct ieee80211_sub_if_data *sdata = rx->sdata; 2631 struct net_device *dev = sdata->dev; 2632 2633 if (unlikely((skb->protocol == sdata->control_port_protocol || 2634 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2635 !sdata->control_port_no_preauth)) && 2636 sdata->control_port_over_nl80211)) { 2637 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2638 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2639 2640 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2641 dev_kfree_skb(skb); 2642 } else { 2643 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2644 2645 memset(skb->cb, 0, sizeof(skb->cb)); 2646 2647 /* 2648 * 802.1X over 802.11 requires that the authenticator address 2649 * be used for EAPOL frames. However, 802.1X allows the use of 2650 * the PAE group address instead. If the interface is part of 2651 * a bridge and we pass the frame with the PAE group address, 2652 * then the bridge will forward it to the network (even if the 2653 * client was not associated yet), which isn't supposed to 2654 * happen. 2655 * To avoid that, rewrite the destination address to our own 2656 * address, so that the authenticator (e.g. hostapd) will see 2657 * the frame, but bridge won't forward it anywhere else. Note 2658 * that due to earlier filtering, the only other address can 2659 * be the PAE group address, unless the hardware allowed them 2660 * through in 802.3 offloaded mode. 2661 */ 2662 if (unlikely(skb->protocol == sdata->control_port_protocol && 2663 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2664 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2665 2666 /* deliver to local stack */ 2667 if (rx->list) 2668 list_add_tail(&skb->list, rx->list); 2669 else 2670 netif_receive_skb(skb); 2671 } 2672 } 2673 2674 /* 2675 * requires that rx->skb is a frame with ethernet header 2676 */ 2677 static void 2678 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2679 { 2680 struct ieee80211_sub_if_data *sdata = rx->sdata; 2681 struct net_device *dev = sdata->dev; 2682 struct sk_buff *skb, *xmit_skb; 2683 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2684 struct sta_info *dsta; 2685 2686 skb = rx->skb; 2687 xmit_skb = NULL; 2688 2689 dev_sw_netstats_rx_add(dev, skb->len); 2690 2691 if (rx->sta) { 2692 /* The seqno index has the same property as needed 2693 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2694 * for non-QoS-data frames. Here we know it's a data 2695 * frame, so count MSDUs. 2696 */ 2697 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2698 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++; 2699 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2700 } 2701 2702 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2703 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2704 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2705 ehdr->h_proto != rx->sdata->control_port_protocol && 2706 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2707 if (is_multicast_ether_addr(ehdr->h_dest) && 2708 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2709 /* 2710 * send multicast frames both to higher layers in 2711 * local net stack and back to the wireless medium 2712 */ 2713 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2714 if (!xmit_skb) 2715 net_info_ratelimited("%s: failed to clone multicast frame\n", 2716 dev->name); 2717 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2718 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2719 dsta = sta_info_get(sdata, ehdr->h_dest); 2720 if (dsta) { 2721 /* 2722 * The destination station is associated to 2723 * this AP (in this VLAN), so send the frame 2724 * directly to it and do not pass it to local 2725 * net stack. 2726 */ 2727 xmit_skb = skb; 2728 skb = NULL; 2729 } 2730 } 2731 } 2732 2733 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2734 if (skb) { 2735 /* 'align' will only take the values 0 or 2 here since all 2736 * frames are required to be aligned to 2-byte boundaries 2737 * when being passed to mac80211; the code here works just 2738 * as well if that isn't true, but mac80211 assumes it can 2739 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2740 */ 2741 int align; 2742 2743 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2744 if (align) { 2745 if (WARN_ON(skb_headroom(skb) < 3)) { 2746 dev_kfree_skb(skb); 2747 skb = NULL; 2748 } else { 2749 u8 *data = skb->data; 2750 size_t len = skb_headlen(skb); 2751 skb->data -= align; 2752 memmove(skb->data, data, len); 2753 skb_set_tail_pointer(skb, len); 2754 } 2755 } 2756 } 2757 #endif 2758 2759 if (skb) { 2760 skb->protocol = eth_type_trans(skb, dev); 2761 ieee80211_deliver_skb_to_local_stack(skb, rx); 2762 } 2763 2764 if (xmit_skb) { 2765 /* 2766 * Send to wireless media and increase priority by 256 to 2767 * keep the received priority instead of reclassifying 2768 * the frame (see cfg80211_classify8021d). 2769 */ 2770 xmit_skb->priority += 256; 2771 xmit_skb->protocol = htons(ETH_P_802_3); 2772 skb_reset_network_header(xmit_skb); 2773 skb_reset_mac_header(xmit_skb); 2774 dev_queue_xmit(xmit_skb); 2775 } 2776 } 2777 2778 #ifdef CONFIG_MAC80211_MESH 2779 static bool 2780 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2781 struct sk_buff *skb, int hdrlen) 2782 { 2783 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2784 struct ieee80211_mesh_fast_tx_key key = { 2785 .type = MESH_FAST_TX_TYPE_FORWARDED 2786 }; 2787 struct ieee80211_mesh_fast_tx *entry; 2788 struct ieee80211s_hdr *mesh_hdr; 2789 struct tid_ampdu_tx *tid_tx; 2790 struct sta_info *sta; 2791 struct ethhdr eth; 2792 u8 tid; 2793 2794 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2795 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2796 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2797 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2798 ether_addr_copy(key.addr, skb->data); 2799 else 2800 return false; 2801 2802 entry = mesh_fast_tx_get(sdata, &key); 2803 if (!entry) 2804 return false; 2805 2806 sta = rcu_dereference(entry->mpath->next_hop); 2807 if (!sta) 2808 return false; 2809 2810 if (skb_linearize(skb)) 2811 return false; 2812 2813 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2814 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2815 if (tid_tx) { 2816 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2817 return false; 2818 2819 if (tid_tx->timeout) 2820 tid_tx->last_tx = jiffies; 2821 } 2822 2823 ieee80211_aggr_check(sdata, sta, skb); 2824 2825 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2826 &skb->protocol)) 2827 hdrlen += ETH_ALEN; 2828 else 2829 skb->protocol = htons(skb->len - hdrlen); 2830 skb_set_network_header(skb, hdrlen + 2); 2831 2832 skb->dev = sdata->dev; 2833 memcpy(ð, skb->data, ETH_HLEN - 2); 2834 skb_pull(skb, 2); 2835 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2836 eth.h_dest, eth.h_source); 2837 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2838 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2839 2840 return true; 2841 } 2842 #endif 2843 2844 static ieee80211_rx_result 2845 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2846 struct sk_buff *skb) 2847 { 2848 #ifdef CONFIG_MAC80211_MESH 2849 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2850 struct ieee80211_local *local = sdata->local; 2851 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2852 struct ieee80211_hdr hdr = { 2853 .frame_control = cpu_to_le16(fc) 2854 }; 2855 struct ieee80211_hdr *fwd_hdr; 2856 struct ieee80211s_hdr *mesh_hdr; 2857 struct ieee80211_tx_info *info; 2858 struct sk_buff *fwd_skb; 2859 struct ethhdr *eth; 2860 bool multicast; 2861 int tailroom = 0; 2862 int hdrlen, mesh_hdrlen; 2863 u8 *qos; 2864 2865 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2866 return RX_CONTINUE; 2867 2868 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2869 return RX_DROP; 2870 2871 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2872 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2873 2874 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2875 return RX_DROP; 2876 2877 eth = (struct ethhdr *)skb->data; 2878 multicast = is_multicast_ether_addr(eth->h_dest); 2879 2880 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2881 if (!mesh_hdr->ttl) 2882 return RX_DROP; 2883 2884 /* frame is in RMC, don't forward */ 2885 if (is_multicast_ether_addr(eth->h_dest) && 2886 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 2887 return RX_DROP; 2888 2889 /* forward packet */ 2890 if (sdata->crypto_tx_tailroom_needed_cnt) 2891 tailroom = IEEE80211_ENCRYPT_TAILROOM; 2892 2893 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2894 struct mesh_path *mppath; 2895 char *proxied_addr; 2896 bool update = false; 2897 2898 if (multicast) 2899 proxied_addr = mesh_hdr->eaddr1; 2900 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2901 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2902 proxied_addr = mesh_hdr->eaddr2; 2903 else 2904 return RX_DROP; 2905 2906 rcu_read_lock(); 2907 mppath = mpp_path_lookup(sdata, proxied_addr); 2908 if (!mppath) { 2909 mpp_path_add(sdata, proxied_addr, eth->h_source); 2910 } else { 2911 spin_lock_bh(&mppath->state_lock); 2912 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 2913 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 2914 update = true; 2915 } 2916 mppath->exp_time = jiffies; 2917 spin_unlock_bh(&mppath->state_lock); 2918 } 2919 2920 /* flush fast xmit cache if the address path changed */ 2921 if (update) 2922 mesh_fast_tx_flush_addr(sdata, proxied_addr); 2923 2924 rcu_read_unlock(); 2925 } 2926 2927 /* Frame has reached destination. Don't forward */ 2928 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 2929 goto rx_accept; 2930 2931 if (!--mesh_hdr->ttl) { 2932 if (multicast) 2933 goto rx_accept; 2934 2935 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2936 return RX_DROP; 2937 } 2938 2939 if (!ifmsh->mshcfg.dot11MeshForwarding) { 2940 if (is_multicast_ether_addr(eth->h_dest)) 2941 goto rx_accept; 2942 2943 return RX_DROP; 2944 } 2945 2946 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 2947 2948 if (!multicast && 2949 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 2950 return RX_QUEUED; 2951 2952 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 2953 eth->h_dest, eth->h_source); 2954 hdrlen = ieee80211_hdrlen(hdr.frame_control); 2955 if (multicast) { 2956 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 2957 2958 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 2959 IEEE80211_ENCRYPT_HEADROOM, 2960 tailroom, GFP_ATOMIC); 2961 if (!fwd_skb) 2962 goto rx_accept; 2963 } else { 2964 fwd_skb = skb; 2965 skb = NULL; 2966 2967 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 2968 return RX_DROP_U_OOM; 2969 2970 if (skb_linearize(fwd_skb)) 2971 return RX_DROP_U_OOM; 2972 } 2973 2974 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 2975 memcpy(fwd_hdr, &hdr, hdrlen - 2); 2976 qos = ieee80211_get_qos_ctl(fwd_hdr); 2977 qos[0] = qos[1] = 0; 2978 2979 skb_reset_mac_header(fwd_skb); 2980 hdrlen += mesh_hdrlen; 2981 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 2982 &fwd_skb->protocol)) 2983 hdrlen += ETH_ALEN; 2984 else 2985 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 2986 skb_set_network_header(fwd_skb, hdrlen + 2); 2987 2988 info = IEEE80211_SKB_CB(fwd_skb); 2989 memset(info, 0, sizeof(*info)); 2990 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 2991 info->control.vif = &sdata->vif; 2992 info->control.jiffies = jiffies; 2993 fwd_skb->dev = sdata->dev; 2994 if (multicast) { 2995 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2996 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2997 /* update power mode indication when forwarding */ 2998 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2999 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 3000 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3001 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3002 } else { 3003 /* unable to resolve next hop */ 3004 if (sta) 3005 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3006 hdr.addr3, 0, 3007 WLAN_REASON_MESH_PATH_NOFORWARD, 3008 sta->sta.addr); 3009 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3010 kfree_skb(fwd_skb); 3011 goto rx_accept; 3012 } 3013 3014 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3015 ieee80211_set_qos_hdr(sdata, fwd_skb); 3016 ieee80211_add_pending_skb(local, fwd_skb); 3017 3018 rx_accept: 3019 if (!skb) 3020 return RX_QUEUED; 3021 3022 ieee80211_strip_8023_mesh_hdr(skb); 3023 #endif 3024 3025 return RX_CONTINUE; 3026 } 3027 3028 static ieee80211_rx_result debug_noinline 3029 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3030 { 3031 struct net_device *dev = rx->sdata->dev; 3032 struct sk_buff *skb = rx->skb; 3033 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3034 __le16 fc = hdr->frame_control; 3035 struct sk_buff_head frame_list; 3036 ieee80211_rx_result res; 3037 struct ethhdr ethhdr; 3038 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3039 3040 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3041 check_da = NULL; 3042 check_sa = NULL; 3043 } else switch (rx->sdata->vif.type) { 3044 case NL80211_IFTYPE_AP: 3045 case NL80211_IFTYPE_AP_VLAN: 3046 check_da = NULL; 3047 break; 3048 case NL80211_IFTYPE_STATION: 3049 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3050 check_sa = NULL; 3051 break; 3052 case NL80211_IFTYPE_MESH_POINT: 3053 check_sa = NULL; 3054 check_da = NULL; 3055 break; 3056 default: 3057 break; 3058 } 3059 3060 skb->dev = dev; 3061 __skb_queue_head_init(&frame_list); 3062 3063 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3064 rx->sdata->vif.addr, 3065 rx->sdata->vif.type, 3066 data_offset, true)) 3067 return RX_DROP_U_BAD_AMSDU; 3068 3069 if (rx->sta->amsdu_mesh_control < 0) { 3070 s8 valid = -1; 3071 int i; 3072 3073 for (i = 0; i <= 2; i++) { 3074 if (!ieee80211_is_valid_amsdu(skb, i)) 3075 continue; 3076 3077 if (valid >= 0) { 3078 /* ambiguous */ 3079 valid = -1; 3080 break; 3081 } 3082 3083 valid = i; 3084 } 3085 3086 rx->sta->amsdu_mesh_control = valid; 3087 } 3088 3089 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3090 rx->sdata->vif.type, 3091 rx->local->hw.extra_tx_headroom, 3092 check_da, check_sa, 3093 rx->sta->amsdu_mesh_control); 3094 3095 while (!skb_queue_empty(&frame_list)) { 3096 rx->skb = __skb_dequeue(&frame_list); 3097 3098 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3099 switch (res) { 3100 case RX_QUEUED: 3101 continue; 3102 case RX_CONTINUE: 3103 break; 3104 default: 3105 goto free; 3106 } 3107 3108 if (!ieee80211_frame_allowed(rx, fc)) 3109 goto free; 3110 3111 ieee80211_deliver_skb(rx); 3112 continue; 3113 3114 free: 3115 dev_kfree_skb(rx->skb); 3116 } 3117 3118 return RX_QUEUED; 3119 } 3120 3121 static ieee80211_rx_result debug_noinline 3122 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3123 { 3124 struct sk_buff *skb = rx->skb; 3125 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3126 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3127 __le16 fc = hdr->frame_control; 3128 3129 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3130 return RX_CONTINUE; 3131 3132 if (unlikely(!ieee80211_is_data(fc))) 3133 return RX_CONTINUE; 3134 3135 if (unlikely(!ieee80211_is_data_present(fc))) 3136 return RX_DROP; 3137 3138 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3139 switch (rx->sdata->vif.type) { 3140 case NL80211_IFTYPE_AP_VLAN: 3141 if (!rx->sdata->u.vlan.sta) 3142 return RX_DROP_U_BAD_4ADDR; 3143 break; 3144 case NL80211_IFTYPE_STATION: 3145 if (!rx->sdata->u.mgd.use_4addr) 3146 return RX_DROP_U_BAD_4ADDR; 3147 break; 3148 case NL80211_IFTYPE_MESH_POINT: 3149 break; 3150 default: 3151 return RX_DROP_U_BAD_4ADDR; 3152 } 3153 } 3154 3155 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3156 return RX_DROP_U_BAD_AMSDU; 3157 3158 if (rx->key) { 3159 /* 3160 * We should not receive A-MSDUs on pre-HT connections, 3161 * and HT connections cannot use old ciphers. Thus drop 3162 * them, as in those cases we couldn't even have SPP 3163 * A-MSDUs or such. 3164 */ 3165 switch (rx->key->conf.cipher) { 3166 case WLAN_CIPHER_SUITE_WEP40: 3167 case WLAN_CIPHER_SUITE_WEP104: 3168 case WLAN_CIPHER_SUITE_TKIP: 3169 return RX_DROP_U_BAD_AMSDU_CIPHER; 3170 default: 3171 break; 3172 } 3173 } 3174 3175 return __ieee80211_rx_h_amsdu(rx, 0); 3176 } 3177 3178 static ieee80211_rx_result debug_noinline 3179 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3180 { 3181 struct ieee80211_sub_if_data *sdata = rx->sdata; 3182 struct ieee80211_local *local = rx->local; 3183 struct net_device *dev = sdata->dev; 3184 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3185 __le16 fc = hdr->frame_control; 3186 ieee80211_rx_result res; 3187 bool port_control; 3188 3189 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3190 return RX_CONTINUE; 3191 3192 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3193 return RX_DROP; 3194 3195 /* Send unexpected-4addr-frame event to hostapd */ 3196 if (ieee80211_has_a4(hdr->frame_control) && 3197 sdata->vif.type == NL80211_IFTYPE_AP) { 3198 if (rx->sta && 3199 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3200 cfg80211_rx_unexpected_4addr_frame( 3201 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 3202 return RX_DROP; 3203 } 3204 3205 res = __ieee80211_data_to_8023(rx, &port_control); 3206 if (unlikely(res != RX_CONTINUE)) 3207 return res; 3208 3209 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3210 if (res != RX_CONTINUE) 3211 return res; 3212 3213 if (!ieee80211_frame_allowed(rx, fc)) 3214 return RX_DROP; 3215 3216 /* directly handle TDLS channel switch requests/responses */ 3217 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3218 cpu_to_be16(ETH_P_TDLS))) { 3219 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3220 3221 if (pskb_may_pull(rx->skb, 3222 offsetof(struct ieee80211_tdls_data, u)) && 3223 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3224 tf->category == WLAN_CATEGORY_TDLS && 3225 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3226 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3227 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3228 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3229 rx->sta, rx->skb); 3230 return RX_QUEUED; 3231 } 3232 } 3233 3234 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3235 unlikely(port_control) && sdata->bss) { 3236 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3237 u.ap); 3238 dev = sdata->dev; 3239 rx->sdata = sdata; 3240 } 3241 3242 rx->skb->dev = dev; 3243 3244 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3245 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3246 !is_multicast_ether_addr( 3247 ((struct ethhdr *)rx->skb->data)->h_dest) && 3248 (!local->scanning && 3249 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3250 mod_timer(&local->dynamic_ps_timer, jiffies + 3251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3252 3253 ieee80211_deliver_skb(rx); 3254 3255 return RX_QUEUED; 3256 } 3257 3258 static ieee80211_rx_result debug_noinline 3259 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3260 { 3261 struct sk_buff *skb = rx->skb; 3262 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3263 struct tid_ampdu_rx *tid_agg_rx; 3264 u16 start_seq_num; 3265 u16 tid; 3266 3267 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3268 return RX_CONTINUE; 3269 3270 if (ieee80211_is_back_req(bar->frame_control)) { 3271 struct { 3272 __le16 control, start_seq_num; 3273 } __packed bar_data; 3274 struct ieee80211_event event = { 3275 .type = BAR_RX_EVENT, 3276 }; 3277 3278 if (!rx->sta) 3279 return RX_DROP; 3280 3281 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3282 &bar_data, sizeof(bar_data))) 3283 return RX_DROP; 3284 3285 tid = le16_to_cpu(bar_data.control) >> 12; 3286 3287 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3288 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3289 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3290 WLAN_BACK_RECIPIENT, 3291 WLAN_REASON_QSTA_REQUIRE_SETUP); 3292 3293 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3294 if (!tid_agg_rx) 3295 return RX_DROP; 3296 3297 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3298 event.u.ba.tid = tid; 3299 event.u.ba.ssn = start_seq_num; 3300 event.u.ba.sta = &rx->sta->sta; 3301 3302 /* reset session timer */ 3303 if (tid_agg_rx->timeout) 3304 mod_timer(&tid_agg_rx->session_timer, 3305 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3306 3307 spin_lock(&tid_agg_rx->reorder_lock); 3308 /* release stored frames up to start of BAR */ 3309 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3310 start_seq_num, frames); 3311 spin_unlock(&tid_agg_rx->reorder_lock); 3312 3313 drv_event_callback(rx->local, rx->sdata, &event); 3314 3315 kfree_skb(skb); 3316 return RX_QUEUED; 3317 } 3318 3319 return RX_DROP; 3320 } 3321 3322 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3323 struct ieee80211_mgmt *mgmt, 3324 size_t len) 3325 { 3326 struct ieee80211_local *local = sdata->local; 3327 struct sk_buff *skb; 3328 struct ieee80211_mgmt *resp; 3329 3330 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3331 /* Not to own unicast address */ 3332 return; 3333 } 3334 3335 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3336 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3337 /* Not from the current AP or not associated yet. */ 3338 return; 3339 } 3340 3341 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 3342 /* Too short SA Query request frame */ 3343 return; 3344 } 3345 3346 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3347 if (skb == NULL) 3348 return; 3349 3350 skb_reserve(skb, local->hw.extra_tx_headroom); 3351 resp = skb_put_zero(skb, 24); 3352 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3353 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3354 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3355 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3356 IEEE80211_STYPE_ACTION); 3357 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 3358 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3359 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 3360 memcpy(resp->u.action.u.sa_query.trans_id, 3361 mgmt->u.action.u.sa_query.trans_id, 3362 WLAN_SA_QUERY_TR_ID_LEN); 3363 3364 ieee80211_tx_skb(sdata, skb); 3365 } 3366 3367 static void 3368 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3369 { 3370 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3371 struct ieee80211_bss_conf *bss_conf; 3372 const struct element *ie; 3373 size_t baselen; 3374 3375 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3376 NL80211_EXT_FEATURE_BSS_COLOR)) 3377 return; 3378 3379 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3380 return; 3381 3382 bss_conf = rx->link->conf; 3383 if (bss_conf->csa_active || bss_conf->color_change_active || 3384 !bss_conf->he_bss_color.enabled) 3385 return; 3386 3387 baselen = mgmt->u.beacon.variable - rx->skb->data; 3388 if (baselen > rx->skb->len) 3389 return; 3390 3391 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3392 mgmt->u.beacon.variable, 3393 rx->skb->len - baselen); 3394 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3395 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3396 const struct ieee80211_he_operation *he_oper; 3397 u8 color; 3398 3399 he_oper = (void *)(ie->data + 1); 3400 if (le32_get_bits(he_oper->he_oper_params, 3401 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3402 return; 3403 3404 color = le32_get_bits(he_oper->he_oper_params, 3405 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3406 if (color == bss_conf->he_bss_color.color) 3407 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3408 BIT_ULL(color), 3409 bss_conf->link_id); 3410 } 3411 } 3412 3413 static ieee80211_rx_result debug_noinline 3414 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3415 { 3416 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3418 3419 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3420 return RX_CONTINUE; 3421 3422 /* 3423 * From here on, look only at management frames. 3424 * Data and control frames are already handled, 3425 * and unknown (reserved) frames are useless. 3426 */ 3427 if (rx->skb->len < 24) 3428 return RX_DROP; 3429 3430 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3431 return RX_DROP; 3432 3433 /* drop too small action frames */ 3434 if (ieee80211_is_action(mgmt->frame_control) && 3435 rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 3436 return RX_DROP_U_RUNT_ACTION; 3437 3438 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3439 ieee80211_is_beacon(mgmt->frame_control) && 3440 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3441 int sig = 0; 3442 3443 /* sw bss color collision detection */ 3444 ieee80211_rx_check_bss_color_collision(rx); 3445 3446 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3447 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3448 sig = status->signal; 3449 3450 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3451 rx->skb->data, rx->skb->len, 3452 ieee80211_rx_status_to_khz(status), 3453 sig); 3454 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3455 } 3456 3457 return ieee80211_drop_unencrypted_mgmt(rx); 3458 } 3459 3460 static bool 3461 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3462 { 3463 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3464 struct ieee80211_sub_if_data *sdata = rx->sdata; 3465 3466 /* TWT actions are only supported in AP for the moment */ 3467 if (sdata->vif.type != NL80211_IFTYPE_AP) 3468 return false; 3469 3470 if (!rx->local->ops->add_twt_setup) 3471 return false; 3472 3473 if (!sdata->vif.bss_conf.twt_responder) 3474 return false; 3475 3476 if (!rx->sta) 3477 return false; 3478 3479 switch (mgmt->u.action.u.s1g.action_code) { 3480 case WLAN_S1G_TWT_SETUP: { 3481 struct ieee80211_twt_setup *twt; 3482 3483 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3484 1 + /* action code */ 3485 sizeof(struct ieee80211_twt_setup) + 3486 2 /* TWT req_type agrt */) 3487 break; 3488 3489 twt = (void *)mgmt->u.action.u.s1g.variable; 3490 if (twt->element_id != WLAN_EID_S1G_TWT) 3491 break; 3492 3493 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 3494 4 + /* action code + token + tlv */ 3495 twt->length) 3496 break; 3497 3498 return true; /* queue the frame */ 3499 } 3500 case WLAN_S1G_TWT_TEARDOWN: 3501 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2) 3502 break; 3503 3504 return true; /* queue the frame */ 3505 default: 3506 break; 3507 } 3508 3509 return false; 3510 } 3511 3512 static ieee80211_rx_result debug_noinline 3513 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3514 { 3515 struct ieee80211_local *local = rx->local; 3516 struct ieee80211_sub_if_data *sdata = rx->sdata; 3517 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3519 int len = rx->skb->len; 3520 3521 if (!ieee80211_is_action(mgmt->frame_control)) 3522 return RX_CONTINUE; 3523 3524 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3525 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3526 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3527 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3528 3529 switch (mgmt->u.action.category) { 3530 case WLAN_CATEGORY_HT: 3531 /* reject HT action frames from stations not supporting HT */ 3532 if (!rx->link_sta->pub->ht_cap.ht_supported) 3533 goto invalid; 3534 3535 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3536 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3537 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3538 sdata->vif.type != NL80211_IFTYPE_AP && 3539 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3540 break; 3541 3542 /* verify action & smps_control/chanwidth are present */ 3543 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3544 goto invalid; 3545 3546 switch (mgmt->u.action.u.ht_smps.action) { 3547 case WLAN_HT_ACTION_SMPS: { 3548 struct ieee80211_supported_band *sband; 3549 enum ieee80211_smps_mode smps_mode; 3550 struct sta_opmode_info sta_opmode = {}; 3551 3552 if (sdata->vif.type != NL80211_IFTYPE_AP && 3553 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3554 goto handled; 3555 3556 /* convert to HT capability */ 3557 switch (mgmt->u.action.u.ht_smps.smps_control) { 3558 case WLAN_HT_SMPS_CONTROL_DISABLED: 3559 smps_mode = IEEE80211_SMPS_OFF; 3560 break; 3561 case WLAN_HT_SMPS_CONTROL_STATIC: 3562 smps_mode = IEEE80211_SMPS_STATIC; 3563 break; 3564 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3565 smps_mode = IEEE80211_SMPS_DYNAMIC; 3566 break; 3567 default: 3568 goto invalid; 3569 } 3570 3571 /* if no change do nothing */ 3572 if (rx->link_sta->pub->smps_mode == smps_mode) 3573 goto handled; 3574 rx->link_sta->pub->smps_mode = smps_mode; 3575 sta_opmode.smps_mode = 3576 ieee80211_smps_mode_to_smps_mode(smps_mode); 3577 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3578 3579 sband = rx->local->hw.wiphy->bands[status->band]; 3580 3581 rate_control_rate_update(local, sband, rx->link_sta, 3582 IEEE80211_RC_SMPS_CHANGED); 3583 cfg80211_sta_opmode_change_notify(sdata->dev, 3584 rx->sta->addr, 3585 &sta_opmode, 3586 GFP_ATOMIC); 3587 goto handled; 3588 } 3589 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3590 struct ieee80211_supported_band *sband; 3591 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 3592 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 3593 struct sta_opmode_info sta_opmode = {}; 3594 3595 /* If it doesn't support 40 MHz it can't change ... */ 3596 if (!(rx->link_sta->pub->ht_cap.cap & 3597 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3598 goto handled; 3599 3600 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 3601 max_bw = IEEE80211_STA_RX_BW_20; 3602 else 3603 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta); 3604 3605 /* set cur_max_bandwidth and recalc sta bw */ 3606 rx->link_sta->cur_max_bandwidth = max_bw; 3607 new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta); 3608 3609 if (rx->link_sta->pub->bandwidth == new_bw) 3610 goto handled; 3611 3612 rx->link_sta->pub->bandwidth = new_bw; 3613 sband = rx->local->hw.wiphy->bands[status->band]; 3614 sta_opmode.bw = 3615 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta); 3616 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; 3617 3618 rate_control_rate_update(local, sband, rx->link_sta, 3619 IEEE80211_RC_BW_CHANGED); 3620 cfg80211_sta_opmode_change_notify(sdata->dev, 3621 rx->sta->addr, 3622 &sta_opmode, 3623 GFP_ATOMIC); 3624 goto handled; 3625 } 3626 default: 3627 goto invalid; 3628 } 3629 3630 break; 3631 case WLAN_CATEGORY_PUBLIC: 3632 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3633 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3634 goto invalid; 3635 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3636 break; 3637 if (!rx->sta) 3638 break; 3639 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3640 break; 3641 if (mgmt->u.action.u.ext_chan_switch.action_code != 3642 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3643 break; 3644 if (len < offsetof(struct ieee80211_mgmt, 3645 u.action.u.ext_chan_switch.variable)) 3646 goto invalid; 3647 goto queue; 3648 case WLAN_CATEGORY_VHT: 3649 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3650 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3651 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3652 sdata->vif.type != NL80211_IFTYPE_AP && 3653 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3654 break; 3655 3656 /* verify action code is present */ 3657 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3658 goto invalid; 3659 3660 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 3661 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3662 /* verify opmode is present */ 3663 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3664 goto invalid; 3665 goto queue; 3666 } 3667 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3668 if (len < IEEE80211_MIN_ACTION_SIZE + 25) 3669 goto invalid; 3670 goto queue; 3671 } 3672 default: 3673 break; 3674 } 3675 break; 3676 case WLAN_CATEGORY_BACK: 3677 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3678 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3679 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3680 sdata->vif.type != NL80211_IFTYPE_AP && 3681 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3682 break; 3683 3684 /* verify action_code is present */ 3685 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3686 break; 3687 3688 switch (mgmt->u.action.u.addba_req.action_code) { 3689 case WLAN_ACTION_ADDBA_REQ: 3690 if (len < (IEEE80211_MIN_ACTION_SIZE + 3691 sizeof(mgmt->u.action.u.addba_req))) 3692 goto invalid; 3693 break; 3694 case WLAN_ACTION_ADDBA_RESP: 3695 if (len < (IEEE80211_MIN_ACTION_SIZE + 3696 sizeof(mgmt->u.action.u.addba_resp))) 3697 goto invalid; 3698 break; 3699 case WLAN_ACTION_DELBA: 3700 if (len < (IEEE80211_MIN_ACTION_SIZE + 3701 sizeof(mgmt->u.action.u.delba))) 3702 goto invalid; 3703 break; 3704 default: 3705 goto invalid; 3706 } 3707 3708 goto queue; 3709 case WLAN_CATEGORY_SPECTRUM_MGMT: 3710 /* verify action_code is present */ 3711 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3712 break; 3713 3714 switch (mgmt->u.action.u.measurement.action_code) { 3715 case WLAN_ACTION_SPCT_MSR_REQ: 3716 if (status->band != NL80211_BAND_5GHZ) 3717 break; 3718 3719 if (len < (IEEE80211_MIN_ACTION_SIZE + 3720 sizeof(mgmt->u.action.u.measurement))) 3721 break; 3722 3723 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3724 break; 3725 3726 ieee80211_process_measurement_req(sdata, mgmt, len); 3727 goto handled; 3728 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3729 u8 *bssid; 3730 if (len < (IEEE80211_MIN_ACTION_SIZE + 3731 sizeof(mgmt->u.action.u.chan_switch))) 3732 break; 3733 3734 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3735 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3736 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3737 break; 3738 3739 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3740 bssid = sdata->deflink.u.mgd.bssid; 3741 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3742 bssid = sdata->u.ibss.bssid; 3743 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3744 bssid = mgmt->sa; 3745 else 3746 break; 3747 3748 if (!ether_addr_equal(mgmt->bssid, bssid)) 3749 break; 3750 3751 goto queue; 3752 } 3753 } 3754 break; 3755 case WLAN_CATEGORY_SELF_PROTECTED: 3756 if (len < (IEEE80211_MIN_ACTION_SIZE + 3757 sizeof(mgmt->u.action.u.self_prot.action_code))) 3758 break; 3759 3760 switch (mgmt->u.action.u.self_prot.action_code) { 3761 case WLAN_SP_MESH_PEERING_OPEN: 3762 case WLAN_SP_MESH_PEERING_CLOSE: 3763 case WLAN_SP_MESH_PEERING_CONFIRM: 3764 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3765 goto invalid; 3766 if (sdata->u.mesh.user_mpm) 3767 /* userspace handles this frame */ 3768 break; 3769 goto queue; 3770 case WLAN_SP_MGK_INFORM: 3771 case WLAN_SP_MGK_ACK: 3772 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3773 goto invalid; 3774 break; 3775 } 3776 break; 3777 case WLAN_CATEGORY_MESH_ACTION: 3778 if (len < (IEEE80211_MIN_ACTION_SIZE + 3779 sizeof(mgmt->u.action.u.mesh_action.action_code))) 3780 break; 3781 3782 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3783 break; 3784 if (mesh_action_is_path_sel(mgmt) && 3785 !mesh_path_sel_is_hwmp(sdata)) 3786 break; 3787 goto queue; 3788 case WLAN_CATEGORY_S1G: 3789 if (len < offsetofend(typeof(*mgmt), 3790 u.action.u.s1g.action_code)) 3791 break; 3792 3793 switch (mgmt->u.action.u.s1g.action_code) { 3794 case WLAN_S1G_TWT_SETUP: 3795 case WLAN_S1G_TWT_TEARDOWN: 3796 if (ieee80211_process_rx_twt_action(rx)) 3797 goto queue; 3798 break; 3799 default: 3800 break; 3801 } 3802 break; 3803 case WLAN_CATEGORY_PROTECTED_EHT: 3804 if (len < offsetofend(typeof(*mgmt), 3805 u.action.u.ttlm_req.action_code)) 3806 break; 3807 3808 switch (mgmt->u.action.u.ttlm_req.action_code) { 3809 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3810 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3811 break; 3812 3813 if (len < offsetofend(typeof(*mgmt), 3814 u.action.u.ttlm_req)) 3815 goto invalid; 3816 goto queue; 3817 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3818 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3819 break; 3820 3821 if (len < offsetofend(typeof(*mgmt), 3822 u.action.u.ttlm_res)) 3823 goto invalid; 3824 goto queue; 3825 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3826 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3827 break; 3828 3829 if (len < offsetofend(typeof(*mgmt), 3830 u.action.u.ttlm_tear_down)) 3831 goto invalid; 3832 goto queue; 3833 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3834 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3835 break; 3836 3837 /* The reconfiguration response action frame must 3838 * least one 'Status Duple' entry (3 octets) 3839 */ 3840 if (len < 3841 offsetofend(typeof(*mgmt), 3842 u.action.u.ml_reconf_resp) + 3) 3843 goto invalid; 3844 goto queue; 3845 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3846 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3847 break; 3848 3849 if (len < offsetofend(typeof(*mgmt), 3850 u.action.u.epcs) + 3851 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3852 goto invalid; 3853 goto queue; 3854 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3855 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3856 break; 3857 3858 if (len < offsetofend(typeof(*mgmt), 3859 u.action.u.epcs)) 3860 goto invalid; 3861 goto queue; 3862 default: 3863 break; 3864 } 3865 break; 3866 } 3867 3868 return RX_CONTINUE; 3869 3870 invalid: 3871 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3872 /* will return in the next handlers */ 3873 return RX_CONTINUE; 3874 3875 handled: 3876 if (rx->sta) 3877 rx->link_sta->rx_stats.packets++; 3878 dev_kfree_skb(rx->skb); 3879 return RX_QUEUED; 3880 3881 queue: 3882 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3883 return RX_QUEUED; 3884 } 3885 3886 static ieee80211_rx_result debug_noinline 3887 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3888 { 3889 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3890 struct cfg80211_rx_info info = { 3891 .freq = ieee80211_rx_status_to_khz(status), 3892 .buf = rx->skb->data, 3893 .len = rx->skb->len, 3894 .link_id = rx->link_id, 3895 .have_link_id = rx->link_id >= 0, 3896 }; 3897 3898 /* skip known-bad action frames and return them in the next handler */ 3899 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3900 return RX_CONTINUE; 3901 3902 /* 3903 * Getting here means the kernel doesn't know how to handle 3904 * it, but maybe userspace does ... include returned frames 3905 * so userspace can register for those to know whether ones 3906 * it transmitted were processed or returned. 3907 */ 3908 3909 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3910 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3911 info.sig_dbm = status->signal; 3912 3913 if (ieee80211_is_timing_measurement(rx->skb) || 3914 ieee80211_is_ftm(rx->skb)) { 3915 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 3916 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 3917 } 3918 3919 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 3920 if (rx->sta) 3921 rx->link_sta->rx_stats.packets++; 3922 dev_kfree_skb(rx->skb); 3923 return RX_QUEUED; 3924 } 3925 3926 return RX_CONTINUE; 3927 } 3928 3929 static ieee80211_rx_result debug_noinline 3930 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 3931 { 3932 struct ieee80211_sub_if_data *sdata = rx->sdata; 3933 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3934 int len = rx->skb->len; 3935 3936 if (!ieee80211_is_action(mgmt->frame_control)) 3937 return RX_CONTINUE; 3938 3939 switch (mgmt->u.action.category) { 3940 case WLAN_CATEGORY_SA_QUERY: 3941 if (len < (IEEE80211_MIN_ACTION_SIZE + 3942 sizeof(mgmt->u.action.u.sa_query))) 3943 break; 3944 3945 switch (mgmt->u.action.u.sa_query.action) { 3946 case WLAN_ACTION_SA_QUERY_REQUEST: 3947 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3948 break; 3949 ieee80211_process_sa_query_req(sdata, mgmt, len); 3950 goto handled; 3951 } 3952 break; 3953 } 3954 3955 return RX_CONTINUE; 3956 3957 handled: 3958 if (rx->sta) 3959 rx->link_sta->rx_stats.packets++; 3960 dev_kfree_skb(rx->skb); 3961 return RX_QUEUED; 3962 } 3963 3964 static ieee80211_rx_result debug_noinline 3965 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 3966 { 3967 struct ieee80211_local *local = rx->local; 3968 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3969 struct sk_buff *nskb; 3970 struct ieee80211_sub_if_data *sdata = rx->sdata; 3971 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3972 3973 if (!ieee80211_is_action(mgmt->frame_control)) 3974 return RX_CONTINUE; 3975 3976 /* 3977 * For AP mode, hostapd is responsible for handling any action 3978 * frames that we didn't handle, including returning unknown 3979 * ones. For all other modes we will return them to the sender, 3980 * setting the 0x80 bit in the action category, as required by 3981 * 802.11-2012 9.24.4. 3982 * Newer versions of hostapd use the management frame registration 3983 * mechanisms and old cooked monitor interface is no longer supported. 3984 */ 3985 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 3986 (sdata->vif.type == NL80211_IFTYPE_AP || 3987 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 3988 return RX_DROP; 3989 3990 if (is_multicast_ether_addr(mgmt->da)) 3991 return RX_DROP; 3992 3993 /* do not return rejected action frames */ 3994 if (mgmt->u.action.category & 0x80) 3995 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 3996 3997 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 3998 GFP_ATOMIC); 3999 if (nskb) { 4000 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 4001 4002 nmgmt->u.action.category |= 0x80; 4003 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 4004 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 4005 4006 memset(nskb->cb, 0, sizeof(nskb->cb)); 4007 4008 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 4009 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 4010 4011 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 4012 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 4013 IEEE80211_TX_CTL_NO_CCK_RATE; 4014 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 4015 info->hw_queue = 4016 local->hw.offchannel_tx_hw_queue; 4017 } 4018 4019 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 4020 status->band); 4021 } 4022 4023 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 4024 } 4025 4026 static ieee80211_rx_result debug_noinline 4027 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 4028 { 4029 struct ieee80211_sub_if_data *sdata = rx->sdata; 4030 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4031 4032 if (!ieee80211_is_ext(hdr->frame_control)) 4033 return RX_CONTINUE; 4034 4035 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4036 return RX_DROP; 4037 4038 /* for now only beacons are ext, so queue them */ 4039 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4040 4041 return RX_QUEUED; 4042 } 4043 4044 static ieee80211_rx_result debug_noinline 4045 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4046 { 4047 struct ieee80211_sub_if_data *sdata = rx->sdata; 4048 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4049 __le16 stype; 4050 4051 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4052 4053 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4054 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4055 sdata->vif.type != NL80211_IFTYPE_OCB && 4056 sdata->vif.type != NL80211_IFTYPE_STATION) 4057 return RX_DROP; 4058 4059 switch (stype) { 4060 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4061 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4062 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4063 /* process for all: mesh, mlme, ibss */ 4064 break; 4065 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4066 if (is_multicast_ether_addr(mgmt->da) && 4067 !is_broadcast_ether_addr(mgmt->da)) 4068 return RX_DROP; 4069 4070 /* process only for station/IBSS */ 4071 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4072 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4073 return RX_DROP; 4074 break; 4075 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4076 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4077 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4078 if (is_multicast_ether_addr(mgmt->da) && 4079 !is_broadcast_ether_addr(mgmt->da)) 4080 return RX_DROP; 4081 4082 /* process only for station */ 4083 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4084 return RX_DROP; 4085 break; 4086 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4087 /* process only for ibss and mesh */ 4088 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4089 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4090 return RX_DROP; 4091 break; 4092 default: 4093 return RX_DROP; 4094 } 4095 4096 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4097 4098 return RX_QUEUED; 4099 } 4100 4101 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4102 ieee80211_rx_result res) 4103 { 4104 if (res == RX_QUEUED) { 4105 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4106 return; 4107 } 4108 4109 if (res != RX_CONTINUE) { 4110 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4111 if (rx->sta) 4112 rx->link_sta->rx_stats.dropped++; 4113 } 4114 4115 kfree_skb_reason(rx->skb, (__force u32)res); 4116 } 4117 4118 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4119 struct sk_buff_head *frames) 4120 { 4121 ieee80211_rx_result res = RX_DROP; 4122 struct sk_buff *skb; 4123 4124 #define CALL_RXH(rxh) \ 4125 do { \ 4126 res = rxh(rx); \ 4127 if (res != RX_CONTINUE) \ 4128 goto rxh_next; \ 4129 } while (0) 4130 4131 /* Lock here to avoid hitting all of the data used in the RX 4132 * path (e.g. key data, station data, ...) concurrently when 4133 * a frame is released from the reorder buffer due to timeout 4134 * from the timer, potentially concurrently with RX from the 4135 * driver. 4136 */ 4137 spin_lock_bh(&rx->local->rx_path_lock); 4138 4139 while ((skb = __skb_dequeue(frames))) { 4140 /* 4141 * all the other fields are valid across frames 4142 * that belong to an aMPDU since they are on the 4143 * same TID from the same station 4144 */ 4145 rx->skb = skb; 4146 4147 if (WARN_ON_ONCE(!rx->link)) 4148 goto rxh_next; 4149 4150 CALL_RXH(ieee80211_rx_h_check_more_data); 4151 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4152 CALL_RXH(ieee80211_rx_h_sta_process); 4153 CALL_RXH(ieee80211_rx_h_decrypt); 4154 CALL_RXH(ieee80211_rx_h_defragment); 4155 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4156 /* must be after MMIC verify so header is counted in MPDU mic */ 4157 CALL_RXH(ieee80211_rx_h_amsdu); 4158 CALL_RXH(ieee80211_rx_h_data); 4159 4160 /* special treatment -- needs the queue */ 4161 res = ieee80211_rx_h_ctrl(rx, frames); 4162 if (res != RX_CONTINUE) 4163 goto rxh_next; 4164 4165 CALL_RXH(ieee80211_rx_h_mgmt_check); 4166 CALL_RXH(ieee80211_rx_h_action); 4167 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4168 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4169 CALL_RXH(ieee80211_rx_h_action_return); 4170 CALL_RXH(ieee80211_rx_h_ext); 4171 CALL_RXH(ieee80211_rx_h_mgmt); 4172 4173 rxh_next: 4174 ieee80211_rx_handlers_result(rx, res); 4175 4176 #undef CALL_RXH 4177 } 4178 4179 spin_unlock_bh(&rx->local->rx_path_lock); 4180 } 4181 4182 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4183 { 4184 struct sk_buff_head reorder_release; 4185 ieee80211_rx_result res = RX_DROP; 4186 4187 __skb_queue_head_init(&reorder_release); 4188 4189 #define CALL_RXH(rxh) \ 4190 do { \ 4191 res = rxh(rx); \ 4192 if (res != RX_CONTINUE) \ 4193 goto rxh_next; \ 4194 } while (0) 4195 4196 CALL_RXH(ieee80211_rx_h_check_dup); 4197 CALL_RXH(ieee80211_rx_h_check); 4198 4199 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4200 4201 ieee80211_rx_handlers(rx, &reorder_release); 4202 return; 4203 4204 rxh_next: 4205 ieee80211_rx_handlers_result(rx, res); 4206 4207 #undef CALL_RXH 4208 } 4209 4210 static bool 4211 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4212 { 4213 return !!(sta->valid_links & BIT(link_id)); 4214 } 4215 4216 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4217 u8 link_id) 4218 { 4219 rx->link_id = link_id; 4220 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4221 4222 if (!rx->sta) 4223 return rx->link; 4224 4225 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4226 return false; 4227 4228 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4229 4230 return rx->link && rx->link_sta; 4231 } 4232 4233 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4234 struct sta_info *sta, int link_id) 4235 { 4236 rx->link_id = link_id; 4237 rx->sta = sta; 4238 4239 if (sta) { 4240 rx->local = sta->sdata->local; 4241 if (!rx->sdata) 4242 rx->sdata = sta->sdata; 4243 rx->link_sta = &sta->deflink; 4244 } else { 4245 rx->link_sta = NULL; 4246 } 4247 4248 if (link_id < 0) { 4249 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4250 sta && !sta->sta.valid_links) 4251 rx->link = 4252 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4253 else 4254 rx->link = &rx->sdata->deflink; 4255 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4256 return false; 4257 } 4258 4259 return true; 4260 } 4261 4262 /* 4263 * This function makes calls into the RX path, therefore 4264 * it has to be invoked under RCU read lock. 4265 */ 4266 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4267 { 4268 struct sk_buff_head frames; 4269 struct ieee80211_rx_data rx = { 4270 /* This is OK -- must be QoS data frame */ 4271 .security_idx = tid, 4272 .seqno_idx = tid, 4273 }; 4274 struct tid_ampdu_rx *tid_agg_rx; 4275 int link_id = -1; 4276 4277 /* FIXME: statistics won't be right with this */ 4278 if (sta->sta.valid_links) 4279 link_id = ffs(sta->sta.valid_links) - 1; 4280 4281 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4282 return; 4283 4284 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4285 if (!tid_agg_rx) 4286 return; 4287 4288 __skb_queue_head_init(&frames); 4289 4290 spin_lock(&tid_agg_rx->reorder_lock); 4291 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4292 spin_unlock(&tid_agg_rx->reorder_lock); 4293 4294 if (!skb_queue_empty(&frames)) { 4295 struct ieee80211_event event = { 4296 .type = BA_FRAME_TIMEOUT, 4297 .u.ba.tid = tid, 4298 .u.ba.sta = &sta->sta, 4299 }; 4300 drv_event_callback(rx.local, rx.sdata, &event); 4301 } 4302 4303 ieee80211_rx_handlers(&rx, &frames); 4304 } 4305 4306 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4307 u16 ssn, u64 filtered, 4308 u16 received_mpdus) 4309 { 4310 struct ieee80211_local *local; 4311 struct sta_info *sta; 4312 struct tid_ampdu_rx *tid_agg_rx; 4313 struct sk_buff_head frames; 4314 struct ieee80211_rx_data rx = { 4315 /* This is OK -- must be QoS data frame */ 4316 .security_idx = tid, 4317 .seqno_idx = tid, 4318 }; 4319 int i, diff; 4320 4321 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4322 return; 4323 4324 __skb_queue_head_init(&frames); 4325 4326 sta = container_of(pubsta, struct sta_info, sta); 4327 4328 local = sta->sdata->local; 4329 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4330 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4331 local->hw.max_rx_aggregation_subframes); 4332 4333 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4334 return; 4335 4336 rcu_read_lock(); 4337 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4338 if (!tid_agg_rx) 4339 goto out; 4340 4341 spin_lock_bh(&tid_agg_rx->reorder_lock); 4342 4343 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4344 int release; 4345 4346 /* release all frames in the reorder buffer */ 4347 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4348 IEEE80211_SN_MODULO; 4349 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4350 release, &frames); 4351 /* update ssn to match received ssn */ 4352 tid_agg_rx->head_seq_num = ssn; 4353 } else { 4354 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4355 &frames); 4356 } 4357 4358 /* handle the case that received ssn is behind the mac ssn. 4359 * it can be tid_agg_rx->buf_size behind and still be valid */ 4360 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4361 if (diff >= tid_agg_rx->buf_size) { 4362 tid_agg_rx->reorder_buf_filtered = 0; 4363 goto release; 4364 } 4365 filtered = filtered >> diff; 4366 ssn += diff; 4367 4368 /* update bitmap */ 4369 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4370 int index = (ssn + i) % tid_agg_rx->buf_size; 4371 4372 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4373 if (filtered & BIT_ULL(i)) 4374 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4375 } 4376 4377 /* now process also frames that the filter marking released */ 4378 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4379 4380 release: 4381 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4382 4383 ieee80211_rx_handlers(&rx, &frames); 4384 4385 out: 4386 rcu_read_unlock(); 4387 } 4388 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4389 4390 /* main receive path */ 4391 4392 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4393 { 4394 return ether_addr_equal(raddr, addr) || 4395 is_broadcast_ether_addr(raddr); 4396 } 4397 4398 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4399 { 4400 struct ieee80211_sub_if_data *sdata = rx->sdata; 4401 struct sk_buff *skb = rx->skb; 4402 struct ieee80211_hdr *hdr = (void *)skb->data; 4403 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4404 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4405 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4406 ieee80211_is_s1g_beacon(hdr->frame_control); 4407 4408 switch (sdata->vif.type) { 4409 case NL80211_IFTYPE_STATION: 4410 if (!bssid && !sdata->u.mgd.use_4addr) 4411 return false; 4412 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4413 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4414 return false; 4415 if (multicast) 4416 return true; 4417 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4418 case NL80211_IFTYPE_ADHOC: 4419 if (!bssid) 4420 return false; 4421 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4422 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4423 !is_valid_ether_addr(hdr->addr2)) 4424 return false; 4425 if (ieee80211_is_beacon(hdr->frame_control)) 4426 return true; 4427 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4428 return false; 4429 if (!multicast && 4430 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4431 return false; 4432 if (!rx->sta) { 4433 int rate_idx; 4434 if (status->encoding != RX_ENC_LEGACY) 4435 rate_idx = 0; /* TODO: HT/VHT rates */ 4436 else 4437 rate_idx = status->rate_idx; 4438 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4439 BIT(rate_idx)); 4440 } 4441 return true; 4442 case NL80211_IFTYPE_OCB: 4443 if (!bssid) 4444 return false; 4445 if (!ieee80211_is_data_present(hdr->frame_control)) 4446 return false; 4447 if (!is_broadcast_ether_addr(bssid)) 4448 return false; 4449 if (!multicast && 4450 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4451 return false; 4452 /* reject invalid/our STA address */ 4453 if (!is_valid_ether_addr(hdr->addr2) || 4454 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4455 return false; 4456 if (!rx->sta) { 4457 int rate_idx; 4458 if (status->encoding != RX_ENC_LEGACY) 4459 rate_idx = 0; /* TODO: HT rates */ 4460 else 4461 rate_idx = status->rate_idx; 4462 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4463 BIT(rate_idx)); 4464 } 4465 return true; 4466 case NL80211_IFTYPE_MESH_POINT: 4467 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4468 return false; 4469 if (multicast) 4470 return true; 4471 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4472 case NL80211_IFTYPE_AP_VLAN: 4473 case NL80211_IFTYPE_AP: 4474 if (!bssid) 4475 return ieee80211_is_our_addr(sdata, hdr->addr1, 4476 &rx->link_id); 4477 4478 if (!is_broadcast_ether_addr(bssid) && 4479 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4480 /* 4481 * Accept public action frames even when the 4482 * BSSID doesn't match, this is used for P2P 4483 * and location updates. Note that mac80211 4484 * itself never looks at these frames. 4485 */ 4486 if (!multicast && 4487 !ieee80211_is_our_addr(sdata, hdr->addr1, 4488 &rx->link_id)) 4489 return false; 4490 if (ieee80211_is_public_action(hdr, skb->len)) 4491 return true; 4492 return ieee80211_is_beacon(hdr->frame_control); 4493 } 4494 4495 if (!ieee80211_has_tods(hdr->frame_control)) { 4496 /* ignore data frames to TDLS-peers */ 4497 if (ieee80211_is_data(hdr->frame_control)) 4498 return false; 4499 /* ignore action frames to TDLS-peers */ 4500 if (ieee80211_is_action(hdr->frame_control) && 4501 !is_broadcast_ether_addr(bssid) && 4502 !ether_addr_equal(bssid, hdr->addr1)) 4503 return false; 4504 } 4505 4506 /* 4507 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4508 * the BSSID - we've checked that already but may have accepted 4509 * the wildcard (ff:ff:ff:ff:ff:ff). 4510 * 4511 * It also says: 4512 * The BSSID of the Data frame is determined as follows: 4513 * a) If the STA is contained within an AP or is associated 4514 * with an AP, the BSSID is the address currently in use 4515 * by the STA contained in the AP. 4516 * 4517 * So we should not accept data frames with an address that's 4518 * multicast. 4519 * 4520 * Accepting it also opens a security problem because stations 4521 * could encrypt it with the GTK and inject traffic that way. 4522 */ 4523 if (ieee80211_is_data(hdr->frame_control) && multicast) 4524 return false; 4525 4526 return true; 4527 case NL80211_IFTYPE_P2P_DEVICE: 4528 return ieee80211_is_public_action(hdr, skb->len) || 4529 ieee80211_is_probe_req(hdr->frame_control) || 4530 ieee80211_is_probe_resp(hdr->frame_control) || 4531 ieee80211_is_beacon(hdr->frame_control) || 4532 (ieee80211_is_auth(hdr->frame_control) && 4533 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4534 case NL80211_IFTYPE_NAN: 4535 /* Currently no frames on NAN interface are allowed */ 4536 return false; 4537 default: 4538 break; 4539 } 4540 4541 WARN_ON_ONCE(1); 4542 return false; 4543 } 4544 4545 void ieee80211_check_fast_rx(struct sta_info *sta) 4546 { 4547 struct ieee80211_sub_if_data *sdata = sta->sdata; 4548 struct ieee80211_local *local = sdata->local; 4549 struct ieee80211_key *key; 4550 struct ieee80211_fast_rx fastrx = { 4551 .dev = sdata->dev, 4552 .vif_type = sdata->vif.type, 4553 .control_port_protocol = sdata->control_port_protocol, 4554 }, *old, *new = NULL; 4555 u32 offload_flags; 4556 bool set_offload = false; 4557 bool assign = false; 4558 bool offload; 4559 4560 /* use sparse to check that we don't return without updating */ 4561 __acquire(check_fast_rx); 4562 4563 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4564 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4565 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4566 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4567 4568 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4569 4570 /* fast-rx doesn't do reordering */ 4571 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4572 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4573 goto clear; 4574 4575 switch (sdata->vif.type) { 4576 case NL80211_IFTYPE_STATION: 4577 if (sta->sta.tdls) { 4578 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4579 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4580 fastrx.expected_ds_bits = 0; 4581 } else { 4582 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4583 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4584 fastrx.expected_ds_bits = 4585 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4586 } 4587 4588 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4589 fastrx.expected_ds_bits |= 4590 cpu_to_le16(IEEE80211_FCTL_TODS); 4591 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4592 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4593 } 4594 4595 if (!sdata->u.mgd.powersave) 4596 break; 4597 4598 /* software powersave is a huge mess, avoid all of it */ 4599 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4600 goto clear; 4601 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4602 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4603 goto clear; 4604 break; 4605 case NL80211_IFTYPE_AP_VLAN: 4606 case NL80211_IFTYPE_AP: 4607 /* parallel-rx requires this, at least with calls to 4608 * ieee80211_sta_ps_transition() 4609 */ 4610 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4611 goto clear; 4612 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4613 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4614 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4615 4616 fastrx.internal_forward = 4617 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4618 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4619 !sdata->u.vlan.sta); 4620 4621 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4622 sdata->u.vlan.sta) { 4623 fastrx.expected_ds_bits |= 4624 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4625 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4626 fastrx.internal_forward = 0; 4627 } 4628 4629 break; 4630 case NL80211_IFTYPE_MESH_POINT: 4631 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4632 IEEE80211_FCTL_TODS); 4633 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4634 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4635 break; 4636 default: 4637 goto clear; 4638 } 4639 4640 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4641 goto clear; 4642 4643 rcu_read_lock(); 4644 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4645 if (!key) 4646 key = rcu_dereference(sdata->default_unicast_key); 4647 if (key) { 4648 switch (key->conf.cipher) { 4649 case WLAN_CIPHER_SUITE_TKIP: 4650 /* we don't want to deal with MMIC in fast-rx */ 4651 goto clear_rcu; 4652 case WLAN_CIPHER_SUITE_CCMP: 4653 case WLAN_CIPHER_SUITE_CCMP_256: 4654 case WLAN_CIPHER_SUITE_GCMP: 4655 case WLAN_CIPHER_SUITE_GCMP_256: 4656 break; 4657 default: 4658 /* We also don't want to deal with 4659 * WEP or cipher scheme. 4660 */ 4661 goto clear_rcu; 4662 } 4663 4664 fastrx.key = true; 4665 fastrx.icv_len = key->conf.icv_len; 4666 } 4667 4668 assign = true; 4669 clear_rcu: 4670 rcu_read_unlock(); 4671 clear: 4672 __release(check_fast_rx); 4673 4674 if (assign) 4675 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4676 4677 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4678 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4679 4680 if (assign && offload) 4681 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4682 else 4683 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4684 4685 if (set_offload) 4686 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4687 4688 spin_lock_bh(&sta->lock); 4689 old = rcu_dereference_protected(sta->fast_rx, true); 4690 rcu_assign_pointer(sta->fast_rx, new); 4691 spin_unlock_bh(&sta->lock); 4692 4693 if (old) 4694 kfree_rcu(old, rcu_head); 4695 } 4696 4697 void ieee80211_clear_fast_rx(struct sta_info *sta) 4698 { 4699 struct ieee80211_fast_rx *old; 4700 4701 spin_lock_bh(&sta->lock); 4702 old = rcu_dereference_protected(sta->fast_rx, true); 4703 RCU_INIT_POINTER(sta->fast_rx, NULL); 4704 spin_unlock_bh(&sta->lock); 4705 4706 if (old) 4707 kfree_rcu(old, rcu_head); 4708 } 4709 4710 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4711 { 4712 struct ieee80211_local *local = sdata->local; 4713 struct sta_info *sta; 4714 4715 lockdep_assert_wiphy(local->hw.wiphy); 4716 4717 list_for_each_entry(sta, &local->sta_list, list) { 4718 if (sdata != sta->sdata && 4719 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4720 continue; 4721 ieee80211_check_fast_rx(sta); 4722 } 4723 } 4724 4725 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4726 { 4727 struct ieee80211_local *local = sdata->local; 4728 4729 lockdep_assert_wiphy(local->hw.wiphy); 4730 4731 __ieee80211_check_fast_rx_iface(sdata); 4732 } 4733 4734 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4735 struct ieee80211_fast_rx *fast_rx, 4736 int orig_len) 4737 { 4738 struct ieee80211_sta_rx_stats *stats; 4739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4740 struct sta_info *sta = rx->sta; 4741 struct link_sta_info *link_sta; 4742 struct sk_buff *skb = rx->skb; 4743 void *sa = skb->data + ETH_ALEN; 4744 void *da = skb->data; 4745 4746 if (rx->link_id >= 0) { 4747 link_sta = rcu_dereference(sta->link[rx->link_id]); 4748 if (WARN_ON_ONCE(!link_sta)) { 4749 dev_kfree_skb(rx->skb); 4750 return; 4751 } 4752 } else { 4753 link_sta = &sta->deflink; 4754 } 4755 4756 stats = &link_sta->rx_stats; 4757 if (fast_rx->uses_rss) 4758 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4759 4760 /* statistics part of ieee80211_rx_h_sta_process() */ 4761 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4762 stats->last_signal = status->signal; 4763 if (!fast_rx->uses_rss) 4764 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4765 -status->signal); 4766 } 4767 4768 if (status->chains) { 4769 int i; 4770 4771 stats->chains = status->chains; 4772 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4773 int signal = status->chain_signal[i]; 4774 4775 if (!(status->chains & BIT(i))) 4776 continue; 4777 4778 stats->chain_signal_last[i] = signal; 4779 if (!fast_rx->uses_rss) 4780 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4781 -signal); 4782 } 4783 } 4784 /* end of statistics */ 4785 4786 stats->last_rx = jiffies; 4787 stats->last_rate = sta_stats_encode_rate(status); 4788 4789 stats->fragments++; 4790 stats->packets++; 4791 4792 skb->dev = fast_rx->dev; 4793 4794 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4795 4796 /* The seqno index has the same property as needed 4797 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4798 * for non-QoS-data frames. Here we know it's a data 4799 * frame, so count MSDUs. 4800 */ 4801 u64_stats_update_begin(&stats->syncp); 4802 stats->msdu[rx->seqno_idx]++; 4803 stats->bytes += orig_len; 4804 u64_stats_update_end(&stats->syncp); 4805 4806 if (fast_rx->internal_forward) { 4807 struct sk_buff *xmit_skb = NULL; 4808 if (is_multicast_ether_addr(da)) { 4809 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4810 } else if (!ether_addr_equal(da, sa) && 4811 sta_info_get(rx->sdata, da)) { 4812 xmit_skb = skb; 4813 skb = NULL; 4814 } 4815 4816 if (xmit_skb) { 4817 /* 4818 * Send to wireless media and increase priority by 256 4819 * to keep the received priority instead of 4820 * reclassifying the frame (see cfg80211_classify8021d). 4821 */ 4822 xmit_skb->priority += 256; 4823 xmit_skb->protocol = htons(ETH_P_802_3); 4824 skb_reset_network_header(xmit_skb); 4825 skb_reset_mac_header(xmit_skb); 4826 dev_queue_xmit(xmit_skb); 4827 } 4828 4829 if (!skb) 4830 return; 4831 } 4832 4833 /* deliver to local stack */ 4834 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4835 ieee80211_deliver_skb_to_local_stack(skb, rx); 4836 } 4837 4838 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4839 struct ieee80211_fast_rx *fast_rx) 4840 { 4841 struct sk_buff *skb = rx->skb; 4842 struct ieee80211_hdr *hdr = (void *)skb->data; 4843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4844 static ieee80211_rx_result res; 4845 int orig_len = skb->len; 4846 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4847 int snap_offs = hdrlen; 4848 struct { 4849 u8 snap[sizeof(rfc1042_header)]; 4850 __be16 proto; 4851 } *payload __aligned(2); 4852 struct { 4853 u8 da[ETH_ALEN]; 4854 u8 sa[ETH_ALEN]; 4855 } addrs __aligned(2); 4856 struct ieee80211_sta_rx_stats *stats; 4857 4858 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4859 * to a common data structure; drivers can implement that per queue 4860 * but we don't have that information in mac80211 4861 */ 4862 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4863 return false; 4864 4865 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4866 4867 /* If using encryption, we also need to have: 4868 * - PN_VALIDATED: similar, but the implementation is tricky 4869 * - DECRYPTED: necessary for PN_VALIDATED 4870 */ 4871 if (fast_rx->key && 4872 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4873 return false; 4874 4875 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4876 return false; 4877 4878 if (unlikely(ieee80211_is_frag(hdr))) 4879 return false; 4880 4881 /* Since our interface address cannot be multicast, this 4882 * implicitly also rejects multicast frames without the 4883 * explicit check. 4884 * 4885 * We shouldn't get any *data* frames not addressed to us 4886 * (AP mode will accept multicast *management* frames), but 4887 * punting here will make it go through the full checks in 4888 * ieee80211_accept_frame(). 4889 */ 4890 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4891 return false; 4892 4893 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4894 IEEE80211_FCTL_TODS)) != 4895 fast_rx->expected_ds_bits) 4896 return false; 4897 4898 /* assign the key to drop unencrypted frames (later) 4899 * and strip the IV/MIC if necessary 4900 */ 4901 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4902 /* GCMP header length is the same */ 4903 snap_offs += IEEE80211_CCMP_HDR_LEN; 4904 } 4905 4906 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 4907 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 4908 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4909 return false; 4910 4911 payload = (void *)(skb->data + snap_offs); 4912 4913 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4914 return false; 4915 4916 /* Don't handle these here since they require special code. 4917 * Accept AARP and IPX even though they should come with a 4918 * bridge-tunnel header - but if we get them this way then 4919 * there's little point in discarding them. 4920 */ 4921 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4922 payload->proto == fast_rx->control_port_protocol)) 4923 return false; 4924 } 4925 4926 /* after this point, don't punt to the slowpath! */ 4927 4928 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 4929 pskb_trim(skb, skb->len - fast_rx->icv_len)) 4930 goto drop; 4931 4932 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 4933 goto drop; 4934 4935 if (status->rx_flags & IEEE80211_RX_AMSDU) { 4936 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 4937 RX_QUEUED) 4938 goto drop; 4939 4940 return true; 4941 } 4942 4943 /* do the header conversion - first grab the addresses */ 4944 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 4945 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 4946 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 4947 skb_pull(skb, snap_offs - 2); 4948 put_unaligned_be16(skb->len - 2, skb->data); 4949 } else { 4950 skb_postpull_rcsum(skb, skb->data + snap_offs, 4951 sizeof(rfc1042_header) + 2); 4952 4953 /* remove the SNAP but leave the ethertype */ 4954 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 4955 } 4956 /* push the addresses in front */ 4957 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 4958 4959 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 4960 switch (res) { 4961 case RX_QUEUED: 4962 return true; 4963 case RX_CONTINUE: 4964 break; 4965 default: 4966 goto drop; 4967 } 4968 4969 ieee80211_rx_8023(rx, fast_rx, orig_len); 4970 4971 return true; 4972 drop: 4973 dev_kfree_skb(skb); 4974 4975 if (fast_rx->uses_rss) 4976 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 4977 else 4978 stats = &rx->link_sta->rx_stats; 4979 4980 stats->dropped++; 4981 return true; 4982 } 4983 4984 /* 4985 * This function returns whether or not the SKB 4986 * was destined for RX processing or not, which, 4987 * if consume is true, is equivalent to whether 4988 * or not the skb was consumed. 4989 */ 4990 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 4991 struct sk_buff *skb, bool consume) 4992 { 4993 struct ieee80211_local *local = rx->local; 4994 struct ieee80211_sub_if_data *sdata = rx->sdata; 4995 struct ieee80211_hdr *hdr = (void *)skb->data; 4996 struct link_sta_info *link_sta = rx->link_sta; 4997 struct ieee80211_link_data *link = rx->link; 4998 4999 rx->skb = skb; 5000 5001 /* See if we can do fast-rx; if we have to copy we already lost, 5002 * so punt in that case. We should never have to deliver a data 5003 * frame to multiple interfaces anyway. 5004 * 5005 * We skip the ieee80211_accept_frame() call and do the necessary 5006 * checking inside ieee80211_invoke_fast_rx(). 5007 */ 5008 if (consume && rx->sta) { 5009 struct ieee80211_fast_rx *fast_rx; 5010 5011 fast_rx = rcu_dereference(rx->sta->fast_rx); 5012 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5013 return true; 5014 } 5015 5016 if (!ieee80211_accept_frame(rx)) 5017 return false; 5018 5019 if (!consume) { 5020 struct skb_shared_hwtstamps *shwt; 5021 5022 rx->skb = skb_copy(skb, GFP_ATOMIC); 5023 if (!rx->skb) { 5024 if (net_ratelimit()) 5025 wiphy_debug(local->hw.wiphy, 5026 "failed to copy skb for %s\n", 5027 sdata->name); 5028 return true; 5029 } 5030 5031 /* skb_copy() does not copy the hw timestamps, so copy it 5032 * explicitly 5033 */ 5034 shwt = skb_hwtstamps(rx->skb); 5035 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5036 5037 /* Update the hdr pointer to the new skb for translation below */ 5038 hdr = (struct ieee80211_hdr *)rx->skb->data; 5039 } 5040 5041 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5042 is_unicast_ether_addr(hdr->addr1) && 5043 !ieee80211_is_probe_resp(hdr->frame_control) && 5044 !ieee80211_is_beacon(hdr->frame_control)) { 5045 /* translate to MLD addresses */ 5046 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5047 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5048 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5049 ether_addr_copy(hdr->addr2, rx->sta->addr); 5050 /* translate A3 only if it's the BSSID */ 5051 if (!ieee80211_has_tods(hdr->frame_control) && 5052 !ieee80211_has_fromds(hdr->frame_control)) { 5053 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5054 ether_addr_copy(hdr->addr3, rx->sta->addr); 5055 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5056 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5057 } 5058 /* not needed for A4 since it can only carry the SA */ 5059 } 5060 5061 ieee80211_invoke_rx_handlers(rx); 5062 return true; 5063 } 5064 5065 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5066 struct ieee80211_sta *pubsta, 5067 struct sk_buff *skb, 5068 struct list_head *list) 5069 { 5070 struct ieee80211_local *local = hw_to_local(hw); 5071 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5072 struct ieee80211_fast_rx *fast_rx; 5073 struct ieee80211_rx_data rx; 5074 struct sta_info *sta; 5075 int link_id = -1; 5076 5077 memset(&rx, 0, sizeof(rx)); 5078 rx.skb = skb; 5079 rx.local = local; 5080 rx.list = list; 5081 rx.link_id = -1; 5082 5083 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5084 5085 /* drop frame if too short for header */ 5086 if (skb->len < sizeof(struct ethhdr)) 5087 goto drop; 5088 5089 if (!pubsta) 5090 goto drop; 5091 5092 if (status->link_valid) 5093 link_id = status->link_id; 5094 5095 /* 5096 * TODO: Should the frame be dropped if the right link_id is not 5097 * available? Or may be it is fine in the current form to proceed with 5098 * the frame processing because with frame being in 802.3 format, 5099 * link_id is used only for stats purpose and updating the stats on 5100 * the deflink is fine? 5101 */ 5102 sta = container_of(pubsta, struct sta_info, sta); 5103 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5104 goto drop; 5105 5106 fast_rx = rcu_dereference(rx.sta->fast_rx); 5107 if (!fast_rx) 5108 goto drop; 5109 5110 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5111 return; 5112 5113 drop: 5114 dev_kfree_skb(skb); 5115 } 5116 5117 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5118 struct sk_buff *skb, bool consume) 5119 { 5120 struct link_sta_info *link_sta; 5121 struct ieee80211_hdr *hdr = (void *)skb->data; 5122 struct sta_info *sta; 5123 int link_id = -1; 5124 5125 /* 5126 * Look up link station first, in case there's a 5127 * chance that they might have a link address that 5128 * is identical to the MLD address, that way we'll 5129 * have the link information if needed. 5130 */ 5131 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5132 if (link_sta) { 5133 sta = link_sta->sta; 5134 link_id = link_sta->link_id; 5135 } else { 5136 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5137 5138 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5139 if (status->link_valid) 5140 link_id = status->link_id; 5141 } 5142 5143 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5144 return false; 5145 5146 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5147 } 5148 5149 /* 5150 * This is the actual Rx frames handler. as it belongs to Rx path it must 5151 * be called with rcu_read_lock protection. 5152 */ 5153 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5154 struct ieee80211_sta *pubsta, 5155 struct sk_buff *skb, 5156 struct list_head *list) 5157 { 5158 struct ieee80211_local *local = hw_to_local(hw); 5159 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5160 struct ieee80211_sub_if_data *sdata; 5161 struct ieee80211_hdr *hdr; 5162 __le16 fc; 5163 struct ieee80211_rx_data rx; 5164 struct ieee80211_sub_if_data *prev; 5165 struct rhlist_head *tmp; 5166 int err = 0; 5167 5168 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5169 memset(&rx, 0, sizeof(rx)); 5170 rx.skb = skb; 5171 rx.local = local; 5172 rx.list = list; 5173 rx.link_id = -1; 5174 5175 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5176 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5177 5178 if (ieee80211_is_mgmt(fc)) { 5179 /* drop frame if too short for header */ 5180 if (skb->len < ieee80211_hdrlen(fc)) 5181 err = -ENOBUFS; 5182 else 5183 err = skb_linearize(skb); 5184 } else { 5185 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5186 } 5187 5188 if (err) { 5189 dev_kfree_skb(skb); 5190 return; 5191 } 5192 5193 hdr = (struct ieee80211_hdr *)skb->data; 5194 ieee80211_parse_qos(&rx); 5195 ieee80211_verify_alignment(&rx); 5196 5197 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5198 ieee80211_is_beacon(hdr->frame_control) || 5199 ieee80211_is_s1g_beacon(hdr->frame_control))) 5200 ieee80211_scan_rx(local, skb); 5201 5202 if (ieee80211_is_data(fc)) { 5203 struct sta_info *sta, *prev_sta; 5204 int link_id = -1; 5205 5206 if (status->link_valid) 5207 link_id = status->link_id; 5208 5209 if (pubsta) { 5210 sta = container_of(pubsta, struct sta_info, sta); 5211 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5212 goto out; 5213 5214 /* 5215 * In MLO connection, fetch the link_id using addr2 5216 * when the driver does not pass link_id in status. 5217 * When the address translation is already performed by 5218 * driver/hw, the valid link_id must be passed in 5219 * status. 5220 */ 5221 5222 if (!status->link_valid && pubsta->mlo) { 5223 struct link_sta_info *link_sta; 5224 5225 link_sta = link_sta_info_get_bss(rx.sdata, 5226 hdr->addr2); 5227 if (!link_sta) 5228 goto out; 5229 5230 ieee80211_rx_data_set_link(&rx, link_sta->link_id); 5231 } 5232 5233 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5234 return; 5235 goto out; 5236 } 5237 5238 prev_sta = NULL; 5239 5240 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5241 if (!prev_sta) { 5242 prev_sta = sta; 5243 continue; 5244 } 5245 5246 rx.sdata = prev_sta->sdata; 5247 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5248 goto out; 5249 5250 if (!status->link_valid && prev_sta->sta.mlo) 5251 continue; 5252 5253 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5254 5255 prev_sta = sta; 5256 } 5257 5258 if (prev_sta) { 5259 rx.sdata = prev_sta->sdata; 5260 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5261 goto out; 5262 5263 if (!status->link_valid && prev_sta->sta.mlo) 5264 goto out; 5265 5266 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5267 return; 5268 goto out; 5269 } 5270 } 5271 5272 prev = NULL; 5273 5274 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5275 if (!ieee80211_sdata_running(sdata)) 5276 continue; 5277 5278 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5279 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5280 continue; 5281 5282 /* 5283 * frame is destined for this interface, but if it's 5284 * not also for the previous one we handle that after 5285 * the loop to avoid copying the SKB once too much 5286 */ 5287 5288 if (!prev) { 5289 prev = sdata; 5290 continue; 5291 } 5292 5293 rx.sdata = prev; 5294 ieee80211_rx_for_interface(&rx, skb, false); 5295 5296 prev = sdata; 5297 } 5298 5299 if (prev) { 5300 rx.sdata = prev; 5301 5302 if (ieee80211_rx_for_interface(&rx, skb, true)) 5303 return; 5304 } 5305 5306 out: 5307 dev_kfree_skb(skb); 5308 } 5309 5310 /* 5311 * This is the receive path handler. It is called by a low level driver when an 5312 * 802.11 MPDU is received from the hardware. 5313 */ 5314 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5315 struct sk_buff *skb, struct list_head *list) 5316 { 5317 struct ieee80211_local *local = hw_to_local(hw); 5318 struct ieee80211_rate *rate = NULL; 5319 struct ieee80211_supported_band *sband; 5320 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5322 5323 WARN_ON_ONCE(softirq_count() == 0); 5324 5325 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5326 goto drop; 5327 5328 sband = local->hw.wiphy->bands[status->band]; 5329 if (WARN_ON(!sband)) 5330 goto drop; 5331 5332 /* 5333 * If we're suspending, it is possible although not too likely 5334 * that we'd be receiving frames after having already partially 5335 * quiesced the stack. We can't process such frames then since 5336 * that might, for example, cause stations to be added or other 5337 * driver callbacks be invoked. 5338 */ 5339 if (unlikely(local->quiescing || local->suspended)) 5340 goto drop; 5341 5342 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5343 if (unlikely(local->in_reconfig)) 5344 goto drop; 5345 5346 /* 5347 * The same happens when we're not even started, 5348 * but that's worth a warning. 5349 */ 5350 if (WARN_ON(!local->started)) 5351 goto drop; 5352 5353 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 5354 /* 5355 * Validate the rate, unless a PLCP error means that 5356 * we probably can't have a valid rate here anyway. 5357 */ 5358 5359 switch (status->encoding) { 5360 case RX_ENC_HT: 5361 /* 5362 * rate_idx is MCS index, which can be [0-76] 5363 * as documented on: 5364 * 5365 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5366 * 5367 * Anything else would be some sort of driver or 5368 * hardware error. The driver should catch hardware 5369 * errors. 5370 */ 5371 if (WARN(status->rate_idx > 76, 5372 "Rate marked as an HT rate but passed " 5373 "status->rate_idx is not " 5374 "an MCS index [0-76]: %d (0x%02x)\n", 5375 status->rate_idx, 5376 status->rate_idx)) 5377 goto drop; 5378 break; 5379 case RX_ENC_VHT: 5380 if (WARN_ONCE(status->rate_idx > 11 || 5381 !status->nss || 5382 status->nss > 8, 5383 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5384 status->rate_idx, status->nss)) 5385 goto drop; 5386 break; 5387 case RX_ENC_HE: 5388 if (WARN_ONCE(status->rate_idx > 11 || 5389 !status->nss || 5390 status->nss > 8, 5391 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5392 status->rate_idx, status->nss)) 5393 goto drop; 5394 break; 5395 case RX_ENC_EHT: 5396 if (WARN_ONCE(status->rate_idx > 15 || 5397 !status->nss || 5398 status->nss > 8 || 5399 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5400 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5401 status->rate_idx, status->nss, status->eht.gi)) 5402 goto drop; 5403 break; 5404 default: 5405 WARN_ON_ONCE(1); 5406 fallthrough; 5407 case RX_ENC_LEGACY: 5408 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5409 goto drop; 5410 rate = &sband->bitrates[status->rate_idx]; 5411 } 5412 } 5413 5414 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5415 goto drop; 5416 5417 status->rx_flags = 0; 5418 5419 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5420 5421 /* 5422 * Frames with failed FCS/PLCP checksum are not returned, 5423 * all other frames are returned without radiotap header 5424 * if it was previously present. 5425 * Also, frames with less than 16 bytes are dropped. 5426 */ 5427 if (!(status->flag & RX_FLAG_8023)) 5428 skb = ieee80211_rx_monitor(local, skb, rate); 5429 if (skb) { 5430 if ((status->flag & RX_FLAG_8023) || 5431 ieee80211_is_data_present(hdr->frame_control)) 5432 ieee80211_tpt_led_trig_rx(local, skb->len); 5433 5434 if (status->flag & RX_FLAG_8023) 5435 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5436 else 5437 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5438 } 5439 5440 kcov_remote_stop(); 5441 return; 5442 drop: 5443 kfree_skb(skb); 5444 } 5445 EXPORT_SYMBOL(ieee80211_rx_list); 5446 5447 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5448 struct sk_buff *skb, struct napi_struct *napi) 5449 { 5450 struct sk_buff *tmp; 5451 LIST_HEAD(list); 5452 5453 5454 /* 5455 * key references and virtual interfaces are protected using RCU 5456 * and this requires that we are in a read-side RCU section during 5457 * receive processing 5458 */ 5459 rcu_read_lock(); 5460 ieee80211_rx_list(hw, pubsta, skb, &list); 5461 rcu_read_unlock(); 5462 5463 if (!napi) { 5464 netif_receive_skb_list(&list); 5465 return; 5466 } 5467 5468 list_for_each_entry_safe(skb, tmp, &list, list) { 5469 skb_list_del_init(skb); 5470 napi_gro_receive(napi, skb); 5471 } 5472 } 5473 EXPORT_SYMBOL(ieee80211_rx_napi); 5474 5475 /* This is a version of the rx handler that can be called from hard irq 5476 * context. Post the skb on the queue and schedule the tasklet */ 5477 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5478 { 5479 struct ieee80211_local *local = hw_to_local(hw); 5480 5481 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5482 5483 skb->pkt_type = IEEE80211_RX_MSG; 5484 skb_queue_tail(&local->skb_queue, skb); 5485 tasklet_schedule(&local->tasklet); 5486 } 5487 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5488