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) 2018-2026 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 RX_FLAG_RADIOTAP_VHT); 64 65 hdr = (void *)skb->data; 66 fc = hdr->frame_control; 67 68 /* 69 * Remove the HT-Control field (if present) on management 70 * frames after we've sent the frame to monitoring. We 71 * (currently) don't need it, and don't properly parse 72 * frames with it present, due to the assumption of a 73 * fixed management header length. 74 */ 75 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc))) 76 return skb; 77 78 hdrlen = ieee80211_hdrlen(fc); 79 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER); 80 81 if (!pskb_may_pull(skb, hdrlen)) { 82 dev_kfree_skb(skb); 83 return NULL; 84 } 85 86 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data, 87 hdrlen - IEEE80211_HT_CTL_LEN); 88 pskb_pull(skb, IEEE80211_HT_CTL_LEN); 89 90 return skb; 91 } 92 93 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len, 94 unsigned int rtap_space) 95 { 96 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 97 struct ieee80211_hdr *hdr; 98 99 hdr = (void *)(skb->data + rtap_space); 100 101 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 102 RX_FLAG_FAILED_PLCP_CRC | 103 RX_FLAG_ONLY_MONITOR | 104 RX_FLAG_NO_PSDU)) 105 return true; 106 107 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space)) 108 return true; 109 110 if (ieee80211_is_ctl(hdr->frame_control) && 111 !ieee80211_is_pspoll(hdr->frame_control) && 112 !ieee80211_is_back_req(hdr->frame_control)) 113 return true; 114 115 return false; 116 } 117 118 static int 119 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, 120 struct ieee80211_rx_status *status, 121 struct sk_buff *skb) 122 { 123 int len; 124 125 /* always present fields */ 126 len = sizeof(struct ieee80211_radiotap_header) + 8; 127 128 /* allocate extra bitmaps */ 129 if (status->chains) 130 len += 4 * hweight8(status->chains); 131 132 if (ieee80211_have_rx_timestamp(status)) { 133 len = ALIGN(len, 8); 134 len += 8; 135 } 136 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 137 len += 1; 138 139 /* antenna field, if we don't have per-chain info */ 140 if (!status->chains) 141 len += 1; 142 143 /* padding for RX_FLAGS if necessary */ 144 len = ALIGN(len, 2); 145 146 if (status->encoding == RX_ENC_HT) /* HT info */ 147 len += 3; 148 149 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 150 len = ALIGN(len, 4); 151 len += 8; 152 } 153 154 if (status->encoding == RX_ENC_VHT) { 155 /* Included even if RX_FLAG_RADIOTAP_VHT is not set */ 156 len = ALIGN(len, 2); 157 len += 12; 158 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_vht) != 12); 159 } 160 161 if (local->hw.radiotap_timestamp.units_pos >= 0) { 162 len = ALIGN(len, 8); 163 len += 12; 164 } 165 166 if (status->encoding == RX_ENC_HE && 167 status->flag & RX_FLAG_RADIOTAP_HE) { 168 len = ALIGN(len, 2); 169 len += 12; 170 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12); 171 } 172 173 if (status->encoding == RX_ENC_HE && 174 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 175 len = ALIGN(len, 2); 176 len += 12; 177 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12); 178 } 179 180 if (status->flag & RX_FLAG_NO_PSDU) 181 len += 1; 182 183 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 184 len = ALIGN(len, 2); 185 len += 4; 186 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4); 187 } 188 189 if (status->chains) { 190 /* antenna and antenna signal fields */ 191 len += 2 * hweight8(status->chains); 192 } 193 194 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) { 195 int tlv_offset = 0; 196 197 /* 198 * The position to look at depends on the existence (or non- 199 * existence) of other elements, so take that into account... 200 */ 201 if (status->flag & RX_FLAG_RADIOTAP_VHT) 202 tlv_offset += 203 sizeof(struct ieee80211_radiotap_vht); 204 if (status->flag & RX_FLAG_RADIOTAP_HE) 205 tlv_offset += 206 sizeof(struct ieee80211_radiotap_he); 207 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 208 tlv_offset += 209 sizeof(struct ieee80211_radiotap_he_mu); 210 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 211 tlv_offset += 212 sizeof(struct ieee80211_radiotap_lsig); 213 214 /* ensure 4 byte alignment for TLV */ 215 len = ALIGN(len, 4); 216 217 /* TLVs until the mac header */ 218 len += skb_mac_header(skb) - &skb->data[tlv_offset]; 219 } 220 221 return len; 222 } 223 224 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata, 225 int link_id, 226 struct sta_info *sta, 227 struct sk_buff *skb) 228 { 229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 230 231 if (link_id >= 0) { 232 status->link_valid = 1; 233 status->link_id = link_id; 234 } else { 235 status->link_valid = 0; 236 } 237 238 skb_queue_tail(&sdata->skb_queue, skb); 239 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 240 if (sta) { 241 struct link_sta_info *link_sta_info; 242 243 if (link_id >= 0) { 244 link_sta_info = rcu_dereference(sta->link[link_id]); 245 if (!link_sta_info) 246 return; 247 } else { 248 link_sta_info = &sta->deflink; 249 } 250 251 link_sta_info->rx_stats.packets++; 252 } 253 } 254 255 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata, 256 int link_id, 257 struct sta_info *sta, 258 struct sk_buff *skb) 259 { 260 skb->protocol = 0; 261 __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb); 262 } 263 264 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, 265 struct sk_buff *skb, 266 int rtap_space) 267 { 268 struct { 269 struct ieee80211_hdr_3addr hdr; 270 u8 category; 271 u8 action_code; 272 } __packed __aligned(2) action; 273 274 if (!sdata) 275 return; 276 277 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE(action_code)); 278 279 if (skb->len < rtap_space + sizeof(action) + 280 VHT_MUMIMO_GROUPS_DATA_LEN) 281 return; 282 283 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) 284 return; 285 286 skb_copy_bits(skb, rtap_space, &action, sizeof(action)); 287 288 if (!ieee80211_is_action(action.hdr.frame_control)) 289 return; 290 291 if (action.category != WLAN_CATEGORY_VHT) 292 return; 293 294 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) 295 return; 296 297 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) 298 return; 299 300 skb = skb_copy(skb, GFP_ATOMIC); 301 if (!skb) 302 return; 303 304 ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb); 305 } 306 307 /* 308 * ieee80211_add_rx_radiotap_header - add radiotap header 309 * 310 * add a radiotap header containing all the fields which the hardware provided. 311 */ 312 static void 313 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 314 struct sk_buff *skb, 315 struct ieee80211_rate *rate, 316 int rtap_len, bool has_fcs) 317 { 318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 319 struct ieee80211_radiotap_header *rthdr; 320 unsigned char *pos; 321 __le32 *it_present; 322 u32 it_present_val; 323 u16 rx_flags = 0; 324 u16 channel_flags = 0; 325 u32 tlvs_len = 0; 326 int mpdulen, chain; 327 unsigned long chains = status->chains; 328 struct ieee80211_radiotap_vht vht = {}; 329 struct ieee80211_radiotap_he he = {}; 330 struct ieee80211_radiotap_he_mu he_mu = {}; 331 struct ieee80211_radiotap_lsig lsig = {}; 332 333 if (status->flag & RX_FLAG_RADIOTAP_VHT) { 334 vht = *(struct ieee80211_radiotap_vht *)skb->data; 335 skb_pull(skb, sizeof(vht)); 336 WARN_ON_ONCE(status->encoding != RX_ENC_VHT); 337 } 338 339 if (status->flag & RX_FLAG_RADIOTAP_HE) { 340 he = *(struct ieee80211_radiotap_he *)skb->data; 341 skb_pull(skb, sizeof(he)); 342 WARN_ON_ONCE(status->encoding != RX_ENC_HE); 343 } 344 345 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { 346 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; 347 skb_pull(skb, sizeof(he_mu)); 348 } 349 350 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 351 lsig = *(struct ieee80211_radiotap_lsig *)skb->data; 352 skb_pull(skb, sizeof(lsig)); 353 } 354 355 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) { 356 /* data is pointer at tlv all other info was pulled off */ 357 tlvs_len = skb_mac_header(skb) - skb->data; 358 } 359 360 mpdulen = skb->len; 361 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 362 mpdulen += FCS_LEN; 363 364 rthdr = skb_push(skb, rtap_len - tlvs_len); 365 memset(rthdr, 0, rtap_len - tlvs_len); 366 it_present = &rthdr->it_present; 367 368 /* radiotap header, set always present flags */ 369 rthdr->it_len = cpu_to_le16(rtap_len); 370 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 371 BIT(IEEE80211_RADIOTAP_CHANNEL) | 372 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 373 374 if (!status->chains) 375 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 376 377 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 378 it_present_val |= 379 BIT(IEEE80211_RADIOTAP_EXT) | 380 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 381 put_unaligned_le32(it_present_val, it_present); 382 it_present++; 383 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 384 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 385 } 386 387 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 388 it_present_val |= BIT(IEEE80211_RADIOTAP_TLV); 389 390 put_unaligned_le32(it_present_val, it_present); 391 392 /* This references through an offset into it_optional[] rather 393 * than via it_present otherwise later uses of pos will cause 394 * the compiler to think we have walked past the end of the 395 * struct member. 396 */ 397 pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional]; 398 399 /* the order of the following fields is important */ 400 401 /* IEEE80211_RADIOTAP_TSFT */ 402 if (ieee80211_have_rx_timestamp(status)) { 403 /* padding */ 404 while ((pos - (u8 *)rthdr) & 7) 405 *pos++ = 0; 406 put_unaligned_le64( 407 ieee80211_calculate_rx_timestamp(&local->hw, status, 408 mpdulen, 0), 409 pos); 410 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT)); 411 pos += 8; 412 } 413 414 /* IEEE80211_RADIOTAP_FLAGS */ 415 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 416 *pos |= IEEE80211_RADIOTAP_F_FCS; 417 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 418 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 419 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) 420 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 421 pos++; 422 423 /* IEEE80211_RADIOTAP_RATE */ 424 if (!rate || status->encoding != RX_ENC_LEGACY) { 425 /* 426 * Without rate information don't add it. If we have, 427 * MCS information is a separate field in radiotap, 428 * added below. The byte here is needed as padding 429 * for the channel though, so initialise it to 0. 430 */ 431 *pos = 0; 432 } else { 433 int shift = 0; 434 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE)); 435 if (status->bw == RATE_INFO_BW_10) 436 shift = 1; 437 else if (status->bw == RATE_INFO_BW_5) 438 shift = 2; 439 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 440 } 441 pos++; 442 443 /* IEEE80211_RADIOTAP_CHANNEL */ 444 /* TODO: frequency offset in KHz */ 445 put_unaligned_le16(status->freq, pos); 446 pos += 2; 447 if (status->bw == RATE_INFO_BW_10) 448 channel_flags |= IEEE80211_CHAN_HALF; 449 else if (status->bw == RATE_INFO_BW_5) 450 channel_flags |= IEEE80211_CHAN_QUARTER; 451 452 if (status->band == NL80211_BAND_5GHZ || 453 status->band == NL80211_BAND_6GHZ) 454 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 455 else if (status->encoding != RX_ENC_LEGACY) 456 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 457 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 458 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 459 else if (rate) 460 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 461 else 462 channel_flags |= IEEE80211_CHAN_2GHZ; 463 put_unaligned_le16(channel_flags, pos); 464 pos += 2; 465 466 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 467 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 468 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 469 *pos = status->signal; 470 rthdr->it_present |= 471 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL)); 472 pos++; 473 } 474 475 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 476 477 if (!status->chains) { 478 /* IEEE80211_RADIOTAP_ANTENNA */ 479 *pos = status->antenna; 480 pos++; 481 } 482 483 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 484 485 /* IEEE80211_RADIOTAP_RX_FLAGS */ 486 /* ensure 2 byte alignment for the 2 byte field as required */ 487 if ((pos - (u8 *)rthdr) & 1) 488 *pos++ = 0; 489 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 490 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 491 put_unaligned_le16(rx_flags, pos); 492 pos += 2; 493 494 if (status->encoding == RX_ENC_HT) { 495 unsigned int stbc; 496 497 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS)); 498 *pos = local->hw.radiotap_mcs_details; 499 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 500 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT; 501 if (status->enc_flags & RX_ENC_FLAG_LDPC) 502 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC; 503 pos++; 504 *pos = 0; 505 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 506 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 507 if (status->bw == RATE_INFO_BW_40) 508 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 509 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 510 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 511 if (status->enc_flags & RX_ENC_FLAG_LDPC) 512 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 513 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; 514 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 515 pos++; 516 *pos++ = status->rate_idx; 517 } 518 519 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 520 u16 flags = 0; 521 522 /* ensure 4 byte alignment */ 523 while ((pos - (u8 *)rthdr) & 3) 524 pos++; 525 rthdr->it_present |= 526 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS)); 527 put_unaligned_le32(status->ampdu_reference, pos); 528 pos += 4; 529 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 530 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 531 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 532 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 533 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 534 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 535 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) 536 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; 537 if (status->flag & RX_FLAG_AMPDU_EOF_BIT) 538 flags |= IEEE80211_RADIOTAP_AMPDU_EOF; 539 put_unaligned_le16(flags, pos); 540 pos += 2; 541 *pos++ = 0; 542 *pos++ = 0; 543 } 544 545 if (status->encoding == RX_ENC_VHT) { 546 u16 fill = local->hw.radiotap_vht_details; 547 548 /* Leave driver filled fields alone */ 549 fill &= ~le16_to_cpu(vht.known); 550 vht.known |= cpu_to_le16(fill); 551 552 if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_GI && 553 status->enc_flags & RX_ENC_FLAG_SHORT_GI) 554 vht.flags |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 555 /* in VHT, STBC is binary */ 556 if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_STBC && 557 status->enc_flags & RX_ENC_FLAG_STBC_MASK) 558 vht.flags |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 559 if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED && 560 status->enc_flags & RX_ENC_FLAG_BF) 561 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 562 563 if (fill & IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 564 switch (status->bw) { 565 case RATE_INFO_BW_40: 566 vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_40; 567 break; 568 case RATE_INFO_BW_80: 569 vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_80; 570 break; 571 case RATE_INFO_BW_160: 572 vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_160; 573 break; 574 default: 575 vht.bandwidth = IEEE80211_RADIOTAP_VHT_BW_20; 576 break; 577 } 578 } 579 580 /* 581 * If the driver filled in mcs_nss[0], then do not touch it. 582 * 583 * Otherwise, put some information about MCS/NSS into the 584 * user 0 field. Note that this is not technically correct for 585 * an MU frame as we might have decoded a different user. 586 */ 587 if (!vht.mcs_nss[0]) { 588 vht.mcs_nss[0] = (status->rate_idx << 4) | status->nss; 589 590 /* coding field */ 591 if (status->enc_flags & RX_ENC_FLAG_LDPC) 592 vht.coding |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 593 } 594 595 /* ensure 2 byte alignment */ 596 while ((pos - (u8 *)rthdr) & 1) 597 pos++; 598 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT)); 599 memcpy(pos, &vht, sizeof(vht)); 600 pos += sizeof(vht); 601 } 602 603 if (local->hw.radiotap_timestamp.units_pos >= 0) { 604 u16 accuracy = 0; 605 u8 flags; 606 u64 ts; 607 608 rthdr->it_present |= 609 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP)); 610 611 /* ensure 8 byte alignment */ 612 while ((pos - (u8 *)rthdr) & 7) 613 pos++; 614 615 if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) { 616 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT; 617 ts = status->mactime; 618 } else { 619 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; 620 ts = status->device_timestamp; 621 } 622 623 put_unaligned_le64(ts, pos); 624 pos += sizeof(u64); 625 626 if (local->hw.radiotap_timestamp.accuracy >= 0) { 627 accuracy = local->hw.radiotap_timestamp.accuracy; 628 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; 629 } 630 put_unaligned_le16(accuracy, pos); 631 pos += sizeof(u16); 632 633 *pos++ = local->hw.radiotap_timestamp.units_pos; 634 *pos++ = flags; 635 } 636 637 if (status->encoding == RX_ENC_HE && 638 status->flag & RX_FLAG_RADIOTAP_HE) { 639 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) 640 641 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { 642 he.data6 |= HE_PREP(DATA6_NSTS, 643 FIELD_GET(RX_ENC_FLAG_STBC_MASK, 644 status->enc_flags)); 645 he.data3 |= HE_PREP(DATA3_STBC, 1); 646 } else { 647 he.data6 |= HE_PREP(DATA6_NSTS, status->nss); 648 } 649 650 #define CHECK_GI(s) \ 651 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ 652 (int)NL80211_RATE_INFO_HE_GI_##s) 653 654 CHECK_GI(0_8); 655 CHECK_GI(1_6); 656 CHECK_GI(3_2); 657 658 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); 659 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); 660 he.data3 |= HE_PREP(DATA3_CODING, 661 !!(status->enc_flags & RX_ENC_FLAG_LDPC)); 662 663 he.data5 |= HE_PREP(DATA5_GI, status->he_gi); 664 665 switch (status->bw) { 666 case RATE_INFO_BW_20: 667 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 668 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); 669 break; 670 case RATE_INFO_BW_40: 671 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 672 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); 673 break; 674 case RATE_INFO_BW_80: 675 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 676 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); 677 break; 678 case RATE_INFO_BW_160: 679 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 680 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); 681 break; 682 case RATE_INFO_BW_HE_RU: 683 #define CHECK_RU_ALLOC(s) \ 684 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ 685 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) 686 687 CHECK_RU_ALLOC(26); 688 CHECK_RU_ALLOC(52); 689 CHECK_RU_ALLOC(106); 690 CHECK_RU_ALLOC(242); 691 CHECK_RU_ALLOC(484); 692 CHECK_RU_ALLOC(996); 693 CHECK_RU_ALLOC(2x996); 694 695 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 696 status->he_ru + 4); 697 break; 698 default: 699 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); 700 } 701 702 /* ensure 2 byte alignment */ 703 while ((pos - (u8 *)rthdr) & 1) 704 pos++; 705 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE)); 706 memcpy(pos, &he, sizeof(he)); 707 pos += sizeof(he); 708 } 709 710 if (status->encoding == RX_ENC_HE && 711 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 712 /* ensure 2 byte alignment */ 713 while ((pos - (u8 *)rthdr) & 1) 714 pos++; 715 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU)); 716 memcpy(pos, &he_mu, sizeof(he_mu)); 717 pos += sizeof(he_mu); 718 } 719 720 if (status->flag & RX_FLAG_NO_PSDU) { 721 rthdr->it_present |= 722 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU)); 723 *pos++ = status->zero_length_psdu_type; 724 } 725 726 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 727 /* ensure 2 byte alignment */ 728 while ((pos - (u8 *)rthdr) & 1) 729 pos++; 730 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG)); 731 memcpy(pos, &lsig, sizeof(lsig)); 732 pos += sizeof(lsig); 733 } 734 735 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 736 *pos++ = status->chain_signal[chain]; 737 *pos++ = chain; 738 } 739 } 740 741 static struct sk_buff * 742 ieee80211_make_monitor_skb(struct ieee80211_local *local, 743 struct sk_buff **origskb, 744 struct ieee80211_rate *rate, 745 int rtap_space, bool use_origskb) 746 { 747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); 748 int rt_hdrlen, needed_headroom; 749 struct sk_buff *skb; 750 751 /* room for the radiotap header based on driver features */ 752 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); 753 needed_headroom = rt_hdrlen - rtap_space; 754 755 if (use_origskb) { 756 /* only need to expand headroom if necessary */ 757 skb = *origskb; 758 *origskb = NULL; 759 760 /* 761 * This shouldn't trigger often because most devices have an 762 * RX header they pull before we get here, and that should 763 * be big enough for our radiotap information. We should 764 * probably export the length to drivers so that we can have 765 * them allocate enough headroom to start with. 766 */ 767 if (skb_headroom(skb) < needed_headroom && 768 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 769 dev_kfree_skb(skb); 770 return NULL; 771 } 772 } else { 773 /* 774 * Need to make a copy and possibly remove radiotap header 775 * and FCS from the original. 776 */ 777 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD, 778 0, GFP_ATOMIC); 779 780 if (!skb) 781 return NULL; 782 } 783 784 /* prepend radiotap information */ 785 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 786 787 skb_reset_mac_header(skb); 788 skb->ip_summed = CHECKSUM_UNNECESSARY; 789 skb->pkt_type = PACKET_OTHERHOST; 790 skb->protocol = htons(ETH_P_802_2); 791 792 return skb; 793 } 794 795 static bool 796 ieee80211_validate_monitor_radio(struct ieee80211_sub_if_data *sdata, 797 struct ieee80211_local *local, 798 struct ieee80211_rx_status *status) 799 { 800 struct wiphy *wiphy = local->hw.wiphy; 801 int i, freq, bw; 802 803 if (!wiphy->n_radio) 804 return true; 805 806 switch (status->bw) { 807 case RATE_INFO_BW_20: 808 bw = 20000; 809 break; 810 case RATE_INFO_BW_40: 811 bw = 40000; 812 break; 813 case RATE_INFO_BW_80: 814 bw = 80000; 815 break; 816 case RATE_INFO_BW_160: 817 bw = 160000; 818 break; 819 case RATE_INFO_BW_320: 820 bw = 320000; 821 break; 822 default: 823 return false; 824 } 825 826 freq = MHZ_TO_KHZ(status->freq); 827 828 for (i = 0; i < wiphy->n_radio; i++) { 829 if (!(sdata->wdev.radio_mask & BIT(i))) 830 continue; 831 832 if (!ieee80211_radio_freq_range_valid(&wiphy->radio[i], freq, bw)) 833 continue; 834 835 return true; 836 } 837 return false; 838 } 839 840 /* 841 * This function copies a received frame to all monitor interfaces and 842 * returns a cleaned-up SKB that no longer includes the FCS nor the 843 * radiotap header the driver might have added. 844 */ 845 static struct sk_buff * 846 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 847 struct ieee80211_rate *rate) 848 { 849 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 850 struct ieee80211_sub_if_data *sdata, *prev_sdata = NULL; 851 struct sk_buff *skb, *monskb = NULL; 852 int present_fcs_len = 0; 853 unsigned int rtap_space = 0; 854 struct ieee80211_sub_if_data *monitor_sdata = 855 rcu_dereference(local->monitor_sdata); 856 bool only_monitor = false; 857 unsigned int min_head_len; 858 859 if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END && 860 !skb_mac_header_was_set(origskb))) { 861 /* with this skb no way to know where frame payload starts */ 862 dev_kfree_skb(origskb); 863 return NULL; 864 } 865 866 if (status->flag & RX_FLAG_RADIOTAP_VHT) 867 rtap_space += sizeof(struct ieee80211_radiotap_vht); 868 869 if (status->flag & RX_FLAG_RADIOTAP_HE) 870 rtap_space += sizeof(struct ieee80211_radiotap_he); 871 872 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 873 rtap_space += sizeof(struct ieee80211_radiotap_he_mu); 874 875 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 876 rtap_space += sizeof(struct ieee80211_radiotap_lsig); 877 878 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) 879 rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space]; 880 881 min_head_len = rtap_space; 882 883 /* 884 * First, we may need to make a copy of the skb because 885 * (1) we need to modify it for radiotap (if not present), and 886 * (2) the other RX handlers will modify the skb we got. 887 * 888 * We don't need to, of course, if we aren't going to return 889 * the SKB because it has a bad FCS/PLCP checksum. 890 */ 891 892 if (!(status->flag & RX_FLAG_NO_PSDU)) { 893 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 894 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { 895 /* driver bug */ 896 WARN_ON(1); 897 dev_kfree_skb(origskb); 898 return NULL; 899 } 900 present_fcs_len = FCS_LEN; 901 } 902 903 /* also consider the hdr->frame_control */ 904 min_head_len += 2; 905 } 906 907 /* ensure that the expected data elements are in skb head */ 908 if (!pskb_may_pull(origskb, min_head_len)) { 909 dev_kfree_skb(origskb); 910 return NULL; 911 } 912 913 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); 914 915 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { 916 if (only_monitor) { 917 dev_kfree_skb(origskb); 918 return NULL; 919 } 920 921 return ieee80211_clean_skb(origskb, present_fcs_len, 922 rtap_space); 923 } 924 925 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); 926 927 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { 928 struct cfg80211_chan_def *chandef; 929 930 chandef = &sdata->vif.bss_conf.chanreq.oper; 931 if (chandef->chan && 932 chandef->chan->center_freq != status->freq) 933 continue; 934 935 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR) && 936 !ieee80211_validate_monitor_radio(sdata, local, status)) 937 continue; 938 939 if (!prev_sdata) { 940 prev_sdata = sdata; 941 continue; 942 } 943 944 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 945 ieee80211_handle_mu_mimo_mon(sdata, origskb, rtap_space); 946 947 if (!monskb) 948 monskb = ieee80211_make_monitor_skb(local, &origskb, 949 rate, rtap_space, 950 false); 951 if (!monskb) 952 continue; 953 954 skb = skb_clone(monskb, GFP_ATOMIC); 955 if (!skb) 956 continue; 957 958 skb->dev = prev_sdata->dev; 959 dev_sw_netstats_rx_add(skb->dev, skb->len); 960 netif_receive_skb(skb); 961 prev_sdata = sdata; 962 } 963 964 if (prev_sdata) { 965 if (monskb) 966 skb = monskb; 967 else 968 skb = ieee80211_make_monitor_skb(local, &origskb, 969 rate, rtap_space, 970 only_monitor); 971 if (skb) { 972 skb->dev = prev_sdata->dev; 973 dev_sw_netstats_rx_add(skb->dev, skb->len); 974 netif_receive_skb(skb); 975 } 976 } 977 978 if (!origskb) 979 return NULL; 980 981 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space); 982 } 983 984 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 985 { 986 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 987 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 988 int tid, seqno_idx, security_idx; 989 990 /* does the frame have a qos control field? */ 991 if (ieee80211_is_data_qos(hdr->frame_control)) { 992 u8 *qc = ieee80211_get_qos_ctl(hdr); 993 /* frame has qos control */ 994 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 995 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 996 status->rx_flags |= IEEE80211_RX_AMSDU; 997 998 seqno_idx = tid; 999 security_idx = tid; 1000 } else { 1001 /* 1002 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 1003 * 1004 * Sequence numbers for management frames, QoS data 1005 * frames with a broadcast/multicast address in the 1006 * Address 1 field, and all non-QoS data frames sent 1007 * by QoS STAs are assigned using an additional single 1008 * modulo-4096 counter, [...] 1009 * 1010 * We also use that counter for non-QoS STAs. 1011 */ 1012 seqno_idx = IEEE80211_NUM_TIDS; 1013 security_idx = 0; 1014 if (ieee80211_is_mgmt(hdr->frame_control)) 1015 security_idx = IEEE80211_NUM_TIDS; 1016 tid = 0; 1017 } 1018 1019 rx->seqno_idx = seqno_idx; 1020 rx->security_idx = security_idx; 1021 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 1022 * For now, set skb->priority to 0 for other cases. */ 1023 rx->skb->priority = (tid > 7) ? 0 : tid; 1024 } 1025 1026 /** 1027 * DOC: Packet alignment 1028 * 1029 * Drivers always need to pass packets that are aligned to two-byte boundaries 1030 * to the stack. 1031 * 1032 * Additionally, they should, if possible, align the payload data in a way that 1033 * guarantees that the contained IP header is aligned to a four-byte 1034 * boundary. In the case of regular frames, this simply means aligning the 1035 * payload to a four-byte boundary (because either the IP header is directly 1036 * contained, or IV/RFC1042 headers that have a length divisible by four are 1037 * in front of it). If the payload data is not properly aligned and the 1038 * architecture doesn't support efficient unaligned operations, mac80211 1039 * will align the data. 1040 * 1041 * With A-MSDU frames, however, the payload data address must yield two modulo 1042 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 1043 * push the IP header further back to a multiple of four again. Thankfully, the 1044 * specs were sane enough this time around to require padding each A-MSDU 1045 * subframe to a length that is a multiple of four. 1046 * 1047 * Padding like Atheros hardware adds which is between the 802.11 header and 1048 * the payload is not supported; the driver is required to move the 802.11 1049 * header to be directly in front of the payload in that case. 1050 */ 1051 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 1052 { 1053 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1054 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 1055 #endif 1056 } 1057 1058 1059 /* rx handlers */ 1060 1061 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 1062 { 1063 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1064 1065 if (is_multicast_ether_addr(hdr->addr1)) 1066 return 0; 1067 1068 return ieee80211_is_robust_mgmt_frame(skb); 1069 } 1070 1071 1072 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 1073 { 1074 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1075 1076 if (!is_multicast_ether_addr(hdr->addr1)) 1077 return 0; 1078 1079 return ieee80211_is_robust_mgmt_frame(skb); 1080 } 1081 1082 1083 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 1084 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 1085 { 1086 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 1087 struct ieee80211_mmie *mmie; 1088 struct ieee80211_mmie_16 *mmie16; 1089 1090 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 1091 return -1; 1092 1093 if (!ieee80211_is_robust_mgmt_frame(skb) && 1094 !ieee80211_is_beacon(hdr->frame_control)) 1095 return -1; /* not a robust management frame */ 1096 1097 mmie = (struct ieee80211_mmie *) 1098 (skb->data + skb->len - sizeof(*mmie)); 1099 if (mmie->element_id == WLAN_EID_MMIE && 1100 mmie->length == sizeof(*mmie) - 2) 1101 return le16_to_cpu(mmie->key_id); 1102 1103 mmie16 = (struct ieee80211_mmie_16 *) 1104 (skb->data + skb->len - sizeof(*mmie16)); 1105 if (skb->len >= 24 + sizeof(*mmie16) && 1106 mmie16->element_id == WLAN_EID_MMIE && 1107 mmie16->length == sizeof(*mmie16) - 2) 1108 return le16_to_cpu(mmie16->key_id); 1109 1110 return -1; 1111 } 1112 1113 static int ieee80211_get_keyid(struct sk_buff *skb) 1114 { 1115 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1116 __le16 fc = hdr->frame_control; 1117 int hdrlen = ieee80211_hdrlen(fc); 1118 u8 keyid; 1119 1120 /* WEP, TKIP, CCMP and GCMP */ 1121 if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN)) 1122 return -EINVAL; 1123 1124 skb_copy_bits(skb, hdrlen + 3, &keyid, 1); 1125 1126 keyid >>= 6; 1127 1128 return keyid; 1129 } 1130 1131 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 1132 { 1133 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1134 char *dev_addr = rx->sdata->vif.addr; 1135 1136 if (ieee80211_is_data(hdr->frame_control)) { 1137 if (is_multicast_ether_addr(hdr->addr1)) { 1138 if (ieee80211_has_tods(hdr->frame_control) || 1139 !ieee80211_has_fromds(hdr->frame_control)) 1140 return RX_DROP_U_MESH_DS_BITS; 1141 if (ether_addr_equal(hdr->addr3, dev_addr)) 1142 return RX_DROP_U_MESH_A3_MISMATCH; 1143 } else { 1144 if (!ieee80211_has_a4(hdr->frame_control)) 1145 return RX_DROP_U_MESH_NO_A4; 1146 if (ether_addr_equal(hdr->addr4, dev_addr)) 1147 return RX_DROP_U_MESH_A4_MISMATCH; 1148 } 1149 } 1150 1151 /* If there is not an established peer link and this is not a peer link 1152 * establisment frame, beacon or probe, drop the frame. 1153 */ 1154 1155 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 1156 struct ieee80211_mgmt *mgmt; 1157 1158 if (!ieee80211_is_mgmt(hdr->frame_control)) 1159 return RX_DROP_U_MESH_UNEXP_DATA; 1160 1161 if (ieee80211_is_action(hdr->frame_control)) { 1162 u8 category; 1163 1164 /* make sure category field is present */ 1165 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category)) 1166 return RX_DROP_U_RUNT_ACTION; 1167 1168 mgmt = (struct ieee80211_mgmt *)hdr; 1169 category = mgmt->u.action.category; 1170 if (category != WLAN_CATEGORY_MESH_ACTION && 1171 category != WLAN_CATEGORY_SELF_PROTECTED) 1172 return RX_DROP_U_MESH_WRONG_ACTION; 1173 return RX_CONTINUE; 1174 } 1175 1176 if (ieee80211_is_probe_req(hdr->frame_control) || 1177 ieee80211_is_probe_resp(hdr->frame_control) || 1178 ieee80211_is_beacon(hdr->frame_control) || 1179 ieee80211_is_auth(hdr->frame_control)) 1180 return RX_CONTINUE; 1181 1182 return RX_DROP_U_MESH_UNEXP_MGMT; 1183 } 1184 1185 return RX_CONTINUE; 1186 } 1187 1188 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, 1189 int index) 1190 { 1191 struct sk_buff_head *frames = &tid_agg_rx->reorder[index].buf; 1192 struct sk_buff *tail = skb_peek_tail(frames); 1193 struct ieee80211_rx_status *status; 1194 1195 if (tid_agg_rx->reorder_buf_filtered && 1196 tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) 1197 return true; 1198 1199 if (!tail) 1200 return false; 1201 1202 status = IEEE80211_SKB_RXCB(tail); 1203 if (status->flag & RX_FLAG_AMSDU_MORE) 1204 return false; 1205 1206 return true; 1207 } 1208 1209 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 1210 struct tid_ampdu_rx *tid_agg_rx, 1211 int index, 1212 struct sk_buff_head *frames) 1213 { 1214 struct sk_buff_head *skb_list = &tid_agg_rx->reorder[index].buf; 1215 struct sk_buff *skb; 1216 struct ieee80211_rx_status *status; 1217 1218 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1219 1220 if (skb_queue_empty(skb_list)) 1221 goto no_frame; 1222 1223 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1224 __skb_queue_purge(skb_list); 1225 goto no_frame; 1226 } 1227 1228 /* release frames from the reorder ring buffer */ 1229 tid_agg_rx->stored_mpdu_num--; 1230 while ((skb = __skb_dequeue(skb_list))) { 1231 status = IEEE80211_SKB_RXCB(skb); 1232 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 1233 __skb_queue_tail(frames, skb); 1234 } 1235 1236 no_frame: 1237 if (tid_agg_rx->reorder_buf_filtered) 1238 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 1239 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1240 } 1241 1242 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 1243 struct tid_ampdu_rx *tid_agg_rx, 1244 u16 head_seq_num, 1245 struct sk_buff_head *frames) 1246 { 1247 int index; 1248 1249 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1250 1251 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 1252 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1253 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1254 frames); 1255 } 1256 } 1257 1258 /* 1259 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 1260 * the skb was added to the buffer longer than this time ago, the earlier 1261 * frames that have not yet been received are assumed to be lost and the skb 1262 * can be released for processing. This may also release other skb's from the 1263 * reorder buffer if there are no additional gaps between the frames. 1264 * 1265 * Callers must hold tid_agg_rx->reorder_lock. 1266 */ 1267 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 1268 1269 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 1270 struct tid_ampdu_rx *tid_agg_rx, 1271 struct sk_buff_head *frames) 1272 { 1273 int index, i, j; 1274 1275 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1276 1277 /* release the buffer until next missing frame */ 1278 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1279 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && 1280 tid_agg_rx->stored_mpdu_num) { 1281 /* 1282 * No buffers ready to be released, but check whether any 1283 * frames in the reorder buffer have timed out. 1284 */ 1285 int skipped = 1; 1286 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 1287 j = (j + 1) % tid_agg_rx->buf_size) { 1288 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { 1289 skipped++; 1290 continue; 1291 } 1292 if (skipped && 1293 !time_after(jiffies, tid_agg_rx->reorder[j].time + 1294 HT_RX_REORDER_BUF_TIMEOUT)) 1295 goto set_release_timer; 1296 1297 /* don't leave incomplete A-MSDUs around */ 1298 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 1299 i = (i + 1) % tid_agg_rx->buf_size) 1300 __skb_queue_purge(&tid_agg_rx->reorder[i].buf); 1301 1302 ht_dbg_ratelimited(sdata, 1303 "release an RX reorder frame due to timeout on earlier frames\n"); 1304 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 1305 frames); 1306 1307 /* 1308 * Increment the head seq# also for the skipped slots. 1309 */ 1310 tid_agg_rx->head_seq_num = 1311 (tid_agg_rx->head_seq_num + 1312 skipped) & IEEE80211_SN_MASK; 1313 skipped = 0; 1314 } 1315 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1316 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1317 frames); 1318 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1319 } 1320 1321 if (tid_agg_rx->stored_mpdu_num) { 1322 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1323 1324 for (; j != (index - 1) % tid_agg_rx->buf_size; 1325 j = (j + 1) % tid_agg_rx->buf_size) { 1326 if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) 1327 break; 1328 } 1329 1330 set_release_timer: 1331 1332 if (!tid_agg_rx->removed) 1333 mod_timer(&tid_agg_rx->reorder_timer, 1334 tid_agg_rx->reorder[j].time + 1 + 1335 HT_RX_REORDER_BUF_TIMEOUT); 1336 } else { 1337 timer_delete(&tid_agg_rx->reorder_timer); 1338 } 1339 } 1340 1341 /* 1342 * As this function belongs to the RX path it must be under 1343 * rcu_read_lock protection. It returns false if the frame 1344 * can be processed immediately, true if it was consumed. 1345 */ 1346 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 1347 struct tid_ampdu_rx *tid_agg_rx, 1348 struct sk_buff *skb, 1349 struct sk_buff_head *frames) 1350 { 1351 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1353 u16 mpdu_seq_num = ieee80211_get_sn(hdr); 1354 u16 head_seq_num, buf_size; 1355 int index; 1356 bool ret = true; 1357 1358 spin_lock(&tid_agg_rx->reorder_lock); 1359 1360 /* 1361 * Offloaded BA sessions have no known starting sequence number so pick 1362 * one from first Rxed frame for this tid after BA was started. 1363 */ 1364 if (unlikely(tid_agg_rx->auto_seq)) { 1365 tid_agg_rx->auto_seq = false; 1366 tid_agg_rx->ssn = mpdu_seq_num; 1367 tid_agg_rx->head_seq_num = mpdu_seq_num; 1368 } 1369 1370 buf_size = tid_agg_rx->buf_size; 1371 head_seq_num = tid_agg_rx->head_seq_num; 1372 1373 /* 1374 * If the current MPDU's SN is smaller than the SSN, it shouldn't 1375 * be reordered. 1376 */ 1377 if (unlikely(!tid_agg_rx->started)) { 1378 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1379 ret = false; 1380 goto out; 1381 } 1382 tid_agg_rx->started = true; 1383 } 1384 1385 /* frame with out of date sequence number */ 1386 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1387 dev_kfree_skb(skb); 1388 goto out; 1389 } 1390 1391 /* 1392 * If frame the sequence number exceeds our buffering window 1393 * size release some previous frames to make room for this one. 1394 */ 1395 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 1396 head_seq_num = ieee80211_sn_inc( 1397 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 1398 /* release stored frames up to new head to stack */ 1399 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 1400 head_seq_num, frames); 1401 } 1402 1403 /* Now the new frame is always in the range of the reordering buffer */ 1404 1405 index = mpdu_seq_num % tid_agg_rx->buf_size; 1406 1407 /* check if we already stored this frame */ 1408 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1409 dev_kfree_skb(skb); 1410 goto out; 1411 } 1412 1413 /* 1414 * If the current MPDU is in the right order and nothing else 1415 * is stored we can process it directly, no need to buffer it. 1416 * If it is first but there's something stored, we may be able 1417 * to release frames after this one. 1418 */ 1419 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1420 tid_agg_rx->stored_mpdu_num == 0) { 1421 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1422 tid_agg_rx->head_seq_num = 1423 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1424 ret = false; 1425 goto out; 1426 } 1427 1428 /* put the frame in the reordering buffer */ 1429 __skb_queue_tail(&tid_agg_rx->reorder[index].buf, skb); 1430 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1431 tid_agg_rx->reorder[index].time = jiffies; 1432 tid_agg_rx->stored_mpdu_num++; 1433 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1434 } 1435 1436 out: 1437 spin_unlock(&tid_agg_rx->reorder_lock); 1438 return ret; 1439 } 1440 1441 /* 1442 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1443 * true if the MPDU was buffered, false if it should be processed. 1444 */ 1445 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1446 struct sk_buff_head *frames) 1447 { 1448 struct sk_buff *skb = rx->skb; 1449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1450 struct sta_info *sta = rx->sta; 1451 struct tid_ampdu_rx *tid_agg_rx; 1452 u16 sc; 1453 u8 tid, ack_policy; 1454 1455 if (!ieee80211_is_data_qos(hdr->frame_control) || 1456 is_multicast_ether_addr(hdr->addr1)) 1457 goto dont_reorder; 1458 1459 /* 1460 * filter the QoS data rx stream according to 1461 * STA/TID and check if this STA/TID is on aggregation 1462 */ 1463 1464 if (!sta) 1465 goto dont_reorder; 1466 1467 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1468 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1469 tid = ieee80211_get_tid(hdr); 1470 1471 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1472 if (!tid_agg_rx) { 1473 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1474 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1475 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1476 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1477 WLAN_BACK_RECIPIENT, 1478 WLAN_REASON_QSTA_REQUIRE_SETUP, 1479 ieee80211_s1g_use_ndp_ba(rx->sdata, 1480 rx->sta)); 1481 goto dont_reorder; 1482 } 1483 1484 /* qos null data frames are excluded */ 1485 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1486 goto dont_reorder; 1487 1488 /* not part of a BA session */ 1489 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 1490 goto dont_reorder; 1491 1492 /* new, potentially un-ordered, ampdu frame - process it */ 1493 1494 /* reset session timer */ 1495 if (tid_agg_rx->timeout) 1496 tid_agg_rx->last_rx = jiffies; 1497 1498 /* if this mpdu is fragmented - terminate rx aggregation session */ 1499 sc = le16_to_cpu(hdr->seq_ctrl); 1500 if (sc & IEEE80211_SCTL_FRAG) { 1501 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb); 1502 return; 1503 } 1504 1505 /* 1506 * No locking needed -- we will only ever process one 1507 * RX packet at a time, and thus own tid_agg_rx. All 1508 * other code manipulating it needs to (and does) make 1509 * sure that we cannot get to it any more before doing 1510 * anything with it. 1511 */ 1512 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1513 frames)) 1514 return; 1515 1516 dont_reorder: 1517 __skb_queue_tail(frames, skb); 1518 } 1519 1520 static ieee80211_rx_result debug_noinline 1521 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1522 { 1523 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1524 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1525 1526 if (status->flag & RX_FLAG_DUP_VALIDATED) 1527 return RX_CONTINUE; 1528 1529 /* 1530 * Drop duplicate 802.11 retransmissions 1531 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1532 */ 1533 1534 if (rx->skb->len < 24) 1535 return RX_CONTINUE; 1536 1537 if (ieee80211_is_ctl(hdr->frame_control) || 1538 ieee80211_is_any_nullfunc(hdr->frame_control)) 1539 return RX_CONTINUE; 1540 1541 if (!rx->sta) 1542 return RX_CONTINUE; 1543 1544 if (unlikely(is_multicast_ether_addr(hdr->addr1))) { 1545 struct ieee80211_sub_if_data *sdata = rx->sdata; 1546 u16 sn = ieee80211_get_sn(hdr); 1547 1548 if (!ieee80211_is_data_present(hdr->frame_control)) 1549 return RX_CONTINUE; 1550 1551 if (!ieee80211_vif_is_mld(&sdata->vif) || 1552 sdata->vif.type != NL80211_IFTYPE_STATION) 1553 return RX_CONTINUE; 1554 1555 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO && 1556 ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last)) 1557 return RX_DROP_U_DUP; 1558 1559 sdata->u.mgd.mcast_seq_last = sn; 1560 return RX_CONTINUE; 1561 } 1562 1563 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1564 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1565 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1566 rx->link_sta->rx_stats.num_duplicates++; 1567 return RX_DROP_U_DUP; 1568 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1569 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1570 } 1571 1572 return RX_CONTINUE; 1573 } 1574 1575 static ieee80211_rx_result debug_noinline 1576 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1577 { 1578 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1579 1580 /* Drop disallowed frame classes based on STA auth/assoc state; 1581 * IEEE 802.11, Chap 5.5. 1582 * 1583 * mac80211 filters only based on association state, i.e. it drops 1584 * Class 3 frames from not associated stations. hostapd sends 1585 * deauth/disassoc frames when needed. In addition, hostapd is 1586 * responsible for filtering on both auth and assoc states. 1587 */ 1588 1589 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1590 return ieee80211_rx_mesh_check(rx); 1591 1592 /* 1593 * Wi-Fi Aware (TM) 4.0 specification 6.2.5: 1594 * For NAN_DATA, unicast data frames must have A2 (source) 1595 * assigned to an active NDP. If not the frame must be dropped 1596 * and NAN Data Path termination frame should be sent. Notify 1597 * user space so it can do so. 1598 */ 1599 if (rx->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 1600 if (ieee80211_is_data(hdr->frame_control) && 1601 !is_multicast_ether_addr(hdr->addr1) && 1602 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) { 1603 if (cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1604 rx->link_id, GFP_ATOMIC)) 1605 return RX_DROP_U_SPURIOUS_NOTIF; 1606 return RX_DROP_U_SPURIOUS; 1607 } 1608 return RX_CONTINUE; 1609 } 1610 1611 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1612 ieee80211_is_pspoll(hdr->frame_control)) && 1613 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1614 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1615 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1616 /* 1617 * accept port control frames from the AP even when it's not 1618 * yet marked ASSOC to prevent a race where we don't set the 1619 * assoc bit quickly enough before it sends the first frame 1620 */ 1621 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1622 ieee80211_is_data_present(hdr->frame_control)) { 1623 unsigned int hdrlen; 1624 __be16 ethertype; 1625 1626 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1627 1628 if (rx->skb->len < hdrlen + 8) 1629 return RX_DROP_U_RUNT_DATA; 1630 1631 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1632 if (ethertype == rx->sdata->control_port_protocol) 1633 return RX_CONTINUE; 1634 } 1635 1636 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1637 cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1638 rx->link_id, GFP_ATOMIC)) 1639 return RX_DROP_U_SPURIOUS_NOTIF; 1640 1641 return RX_DROP_U_SPURIOUS; 1642 } 1643 1644 return RX_CONTINUE; 1645 } 1646 1647 1648 static ieee80211_rx_result debug_noinline 1649 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1650 { 1651 struct ieee80211_local *local; 1652 struct ieee80211_hdr *hdr; 1653 struct sk_buff *skb; 1654 1655 local = rx->local; 1656 skb = rx->skb; 1657 hdr = (struct ieee80211_hdr *) skb->data; 1658 1659 if (!local->pspolling) 1660 return RX_CONTINUE; 1661 1662 if (!ieee80211_has_fromds(hdr->frame_control)) 1663 /* this is not from AP */ 1664 return RX_CONTINUE; 1665 1666 if (!ieee80211_is_data(hdr->frame_control)) 1667 return RX_CONTINUE; 1668 1669 if (!ieee80211_has_moredata(hdr->frame_control)) { 1670 /* AP has no more frames buffered for us */ 1671 local->pspolling = false; 1672 return RX_CONTINUE; 1673 } 1674 1675 /* more data bit is set, let's request a new frame from the AP */ 1676 ieee80211_send_pspoll(local, rx->sdata); 1677 1678 return RX_CONTINUE; 1679 } 1680 1681 static void sta_ps_start(struct sta_info *sta) 1682 { 1683 struct ieee80211_sub_if_data *sdata = sta->sdata; 1684 struct ieee80211_local *local = sdata->local; 1685 struct ps_data *ps; 1686 int tid; 1687 1688 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1689 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1690 ps = &sdata->bss->ps; 1691 else 1692 return; 1693 1694 atomic_inc(&ps->num_sta_ps); 1695 set_sta_flag(sta, WLAN_STA_PS_STA); 1696 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1697 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1698 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1699 sta->sta.addr, sta->sta.aid); 1700 1701 ieee80211_clear_fast_xmit(sta); 1702 1703 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1704 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1705 struct txq_info *txqi = to_txq_info(txq); 1706 1707 spin_lock(&local->active_txq_lock[txq->ac]); 1708 if (!list_empty(&txqi->schedule_order)) 1709 list_del_init(&txqi->schedule_order); 1710 spin_unlock(&local->active_txq_lock[txq->ac]); 1711 1712 if (txq_has_queue(txq)) 1713 set_bit(tid, &sta->txq_buffered_tids); 1714 else 1715 clear_bit(tid, &sta->txq_buffered_tids); 1716 } 1717 } 1718 1719 static void sta_ps_end(struct sta_info *sta) 1720 { 1721 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1722 sta->sta.addr, sta->sta.aid); 1723 1724 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1725 /* 1726 * Clear the flag only if the other one is still set 1727 * so that the TX path won't start TX'ing new frames 1728 * directly ... In the case that the driver flag isn't 1729 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1730 */ 1731 clear_sta_flag(sta, WLAN_STA_PS_STA); 1732 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1733 sta->sta.addr, sta->sta.aid); 1734 return; 1735 } 1736 1737 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1738 clear_sta_flag(sta, WLAN_STA_PS_STA); 1739 ieee80211_sta_ps_deliver_wakeup(sta); 1740 } 1741 1742 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1743 { 1744 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1745 bool in_ps; 1746 1747 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1748 1749 /* Don't let the same PS state be set twice */ 1750 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1751 if ((start && in_ps) || (!start && !in_ps)) 1752 return -EINVAL; 1753 1754 if (start) 1755 sta_ps_start(sta); 1756 else 1757 sta_ps_end(sta); 1758 1759 return 0; 1760 } 1761 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1762 1763 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1764 { 1765 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1766 1767 if (test_sta_flag(sta, WLAN_STA_SP)) 1768 return; 1769 1770 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1771 ieee80211_sta_ps_deliver_poll_response(sta); 1772 else 1773 set_sta_flag(sta, WLAN_STA_PSPOLL); 1774 } 1775 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1776 1777 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1778 { 1779 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1780 int ac = ieee80211_ac_from_tid(tid); 1781 1782 /* 1783 * If this AC is not trigger-enabled do nothing unless the 1784 * driver is calling us after it already checked. 1785 * 1786 * NB: This could/should check a separate bitmap of trigger- 1787 * enabled queues, but for now we only implement uAPSD w/o 1788 * TSPEC changes to the ACs, so they're always the same. 1789 */ 1790 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1791 tid != IEEE80211_NUM_TIDS) 1792 return; 1793 1794 /* if we are in a service period, do nothing */ 1795 if (test_sta_flag(sta, WLAN_STA_SP)) 1796 return; 1797 1798 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1799 ieee80211_sta_ps_deliver_uapsd(sta); 1800 else 1801 set_sta_flag(sta, WLAN_STA_UAPSD); 1802 } 1803 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1804 1805 static ieee80211_rx_result debug_noinline 1806 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1807 { 1808 struct ieee80211_sub_if_data *sdata = rx->sdata; 1809 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1810 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1811 1812 if (!rx->sta) 1813 return RX_CONTINUE; 1814 1815 if (sdata->vif.type != NL80211_IFTYPE_AP && 1816 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1817 return RX_CONTINUE; 1818 1819 /* 1820 * The device handles station powersave, so don't do anything about 1821 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1822 * it to mac80211 since they're handled.) 1823 */ 1824 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1825 return RX_CONTINUE; 1826 1827 /* 1828 * Don't do anything if the station isn't already asleep. In 1829 * the uAPSD case, the station will probably be marked asleep, 1830 * in the PS-Poll case the station must be confused ... 1831 */ 1832 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1833 return RX_CONTINUE; 1834 1835 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1836 ieee80211_sta_pspoll(&rx->sta->sta); 1837 1838 /* Free PS Poll skb here instead of returning RX_DROP that would 1839 * count as an dropped frame. */ 1840 dev_kfree_skb(rx->skb); 1841 1842 return RX_QUEUED; 1843 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1844 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1845 ieee80211_has_pm(hdr->frame_control) && 1846 (ieee80211_is_data_qos(hdr->frame_control) || 1847 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1848 u8 tid = ieee80211_get_tid(hdr); 1849 1850 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1851 } 1852 1853 return RX_CONTINUE; 1854 } 1855 1856 static ieee80211_rx_result debug_noinline 1857 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1858 { 1859 struct sta_info *sta = rx->sta; 1860 struct link_sta_info *link_sta = rx->link_sta; 1861 struct sk_buff *skb = rx->skb; 1862 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1863 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1864 int i; 1865 1866 if (!sta || !link_sta) 1867 return RX_CONTINUE; 1868 1869 /* 1870 * Update last_rx only for IBSS packets which are for the current 1871 * BSSID and for station already AUTHORIZED to avoid keeping the 1872 * current IBSS network alive in cases where other STAs start 1873 * using different BSSID. This will also give the station another 1874 * chance to restart the authentication/authorization in case 1875 * something went wrong the first time. 1876 */ 1877 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1878 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1879 NL80211_IFTYPE_ADHOC); 1880 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1881 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1882 link_sta->rx_stats.last_rx = jiffies; 1883 if (ieee80211_is_data_present(hdr->frame_control) && 1884 !is_multicast_ether_addr(hdr->addr1)) 1885 link_sta->rx_stats.last_rate = 1886 sta_stats_encode_rate(status); 1887 } 1888 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1889 link_sta->rx_stats.last_rx = jiffies; 1890 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1891 !is_multicast_ether_addr(hdr->addr1)) { 1892 /* 1893 * Mesh beacons will update last_rx when if they are found to 1894 * match the current local configuration when processed. 1895 */ 1896 link_sta->rx_stats.last_rx = jiffies; 1897 if (ieee80211_is_data_present(hdr->frame_control)) 1898 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1899 } 1900 1901 link_sta->rx_stats.fragments++; 1902 1903 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1904 u64_stats_add(&link_sta->rx_stats.bytes, rx->skb->len); 1905 u64_stats_update_end(&link_sta->rx_stats.syncp); 1906 1907 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1908 link_sta->rx_stats.last_signal = status->signal; 1909 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1910 -status->signal); 1911 } 1912 1913 if (status->chains) { 1914 link_sta->rx_stats.chains = status->chains; 1915 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1916 int signal = status->chain_signal[i]; 1917 1918 if (!(status->chains & BIT(i))) 1919 continue; 1920 1921 link_sta->rx_stats.chain_signal_last[i] = signal; 1922 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1923 -signal); 1924 } 1925 } 1926 1927 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1928 return RX_CONTINUE; 1929 1930 /* 1931 * Change STA power saving mode only at the end of a frame 1932 * exchange sequence, and only for a data or management 1933 * frame as specified in IEEE 802.11-2016 11.2.3.2 1934 */ 1935 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1936 !ieee80211_has_morefrags(hdr->frame_control) && 1937 !is_multicast_ether_addr(hdr->addr1) && 1938 (ieee80211_is_mgmt(hdr->frame_control) || 1939 ieee80211_is_data(hdr->frame_control)) && 1940 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1941 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1942 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1943 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1944 if (!ieee80211_has_pm(hdr->frame_control)) 1945 sta_ps_end(sta); 1946 } else { 1947 if (ieee80211_has_pm(hdr->frame_control)) 1948 sta_ps_start(sta); 1949 } 1950 } 1951 1952 /* mesh power save support */ 1953 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1954 ieee80211_mps_rx_h_sta_process(sta, hdr); 1955 1956 /* 1957 * Drop (qos-)data::nullfunc frames silently, since they 1958 * are used only to control station power saving mode. 1959 */ 1960 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1961 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1962 1963 /* 1964 * If we receive a 4-addr nullfunc frame from a STA 1965 * that was not moved to a 4-addr STA vlan yet send 1966 * the event to userspace and for older hostapd drop 1967 * the frame to the monitor interface. 1968 */ 1969 if (ieee80211_has_a4(hdr->frame_control) && 1970 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1971 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1972 !rx->sdata->u.vlan.sta))) { 1973 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1974 cfg80211_rx_unexpected_4addr_frame( 1975 rx->sdata->dev, sta->sta.addr, 1976 rx->link_id, GFP_ATOMIC); 1977 return RX_DROP_U_UNEXPECTED_4ADDR_FRAME; 1978 } 1979 /* 1980 * Update counter and free packet here to avoid 1981 * counting this as a dropped packed. 1982 */ 1983 link_sta->rx_stats.packets++; 1984 dev_kfree_skb(rx->skb); 1985 return RX_QUEUED; 1986 } 1987 1988 return RX_CONTINUE; 1989 } /* ieee80211_rx_h_sta_process */ 1990 1991 static struct ieee80211_key * 1992 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1993 { 1994 struct ieee80211_key *key = NULL; 1995 int idx2; 1996 1997 /* Make sure key gets set if either BIGTK key index is set so that 1998 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1999 * Beacon frames and Beacon frames that claim to use another BIGTK key 2000 * index (i.e., a key that we do not have). 2001 */ 2002 2003 if (idx < 0) { 2004 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 2005 idx2 = idx + 1; 2006 } else { 2007 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2008 idx2 = idx + 1; 2009 else 2010 idx2 = idx - 1; 2011 } 2012 2013 if (rx->link_sta) 2014 key = rcu_dereference(rx->link_sta->gtk[idx]); 2015 if (!key) 2016 key = rcu_dereference(rx->link->gtk[idx]); 2017 if (!key && rx->link_sta) 2018 key = rcu_dereference(rx->link_sta->gtk[idx2]); 2019 if (!key) 2020 key = rcu_dereference(rx->link->gtk[idx2]); 2021 2022 return key; 2023 } 2024 2025 static ieee80211_rx_result debug_noinline 2026 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 2027 { 2028 struct sk_buff *skb = rx->skb; 2029 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2030 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2031 int keyidx; 2032 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 2033 struct ieee80211_key *sta_ptk = NULL; 2034 struct ieee80211_key *ptk_idx = NULL; 2035 int mmie_keyidx = -1; 2036 __le16 fc; 2037 2038 if (ieee80211_is_ext(hdr->frame_control)) 2039 return RX_CONTINUE; 2040 2041 /* 2042 * Key selection 101 2043 * 2044 * There are five types of keys: 2045 * - GTK (group keys) 2046 * - IGTK (group keys for management frames) 2047 * - BIGTK (group keys for Beacon frames) 2048 * - PTK (pairwise keys) 2049 * - STK (station-to-station pairwise keys) 2050 * 2051 * When selecting a key, we have to distinguish between multicast 2052 * (including broadcast) and unicast frames, the latter can only 2053 * use PTKs and STKs while the former always use GTKs, IGTKs, and 2054 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 2055 * then unicast frames can also use key indices like GTKs. Hence, if we 2056 * don't have a PTK/STK we check the key index for a WEP key. 2057 * 2058 * Note that in a regular BSS, multicast frames are sent by the 2059 * AP only, associated stations unicast the frame to the AP first 2060 * which then multicasts it on their behalf. 2061 * 2062 * There is also a slight problem in IBSS mode: GTKs are negotiated 2063 * with each station, that is something we don't currently handle. 2064 * The spec seems to expect that one negotiates the same key with 2065 * every station but there's no such requirement; VLANs could be 2066 * possible. 2067 */ 2068 2069 /* start without a key */ 2070 rx->key = NULL; 2071 fc = hdr->frame_control; 2072 2073 if (rx->sta) { 2074 int keyid = rx->sta->ptk_idx; 2075 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 2076 2077 if (ieee80211_has_protected(fc) && 2078 !(status->flag & RX_FLAG_IV_STRIPPED)) { 2079 keyid = ieee80211_get_keyid(rx->skb); 2080 2081 if (unlikely(keyid < 0)) 2082 return RX_DROP_U_NO_KEY_ID; 2083 2084 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 2085 } 2086 } 2087 2088 if (!ieee80211_has_protected(fc)) 2089 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 2090 2091 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 2092 rx->key = ptk_idx ? ptk_idx : sta_ptk; 2093 if ((status->flag & RX_FLAG_DECRYPTED) && 2094 (status->flag & RX_FLAG_IV_STRIPPED)) 2095 return RX_CONTINUE; 2096 /* Skip decryption if the frame is not protected. */ 2097 if (!ieee80211_has_protected(fc)) 2098 return RX_CONTINUE; 2099 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 2100 /* Broadcast/multicast robust management frame / BIP */ 2101 if ((status->flag & RX_FLAG_DECRYPTED) && 2102 (status->flag & RX_FLAG_IV_STRIPPED)) 2103 return RX_CONTINUE; 2104 2105 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 2106 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 2107 NUM_DEFAULT_BEACON_KEYS) { 2108 if (rx->sdata->dev) 2109 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2110 skb->data, 2111 skb->len); 2112 return RX_DROP_U_BAD_BCN_KEYIDX; 2113 } 2114 2115 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2116 if (!rx->key) 2117 return RX_CONTINUE; /* Beacon protection not in use */ 2118 } else if (mmie_keyidx >= 0) { 2119 /* Broadcast/multicast robust management frame / BIP */ 2120 if ((status->flag & RX_FLAG_DECRYPTED) && 2121 (status->flag & RX_FLAG_IV_STRIPPED)) 2122 return RX_CONTINUE; 2123 2124 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2125 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2126 return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2127 if (rx->link_sta) { 2128 if (ieee80211_is_group_privacy_action(skb) && 2129 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2130 return RX_DROP_U_UNPROTECTED; 2131 2132 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2133 } 2134 if (!rx->key) 2135 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2136 } else if (!ieee80211_has_protected(fc)) { 2137 /* 2138 * The frame was not protected, so skip decryption. However, we 2139 * need to set rx->key if there is a key that could have been 2140 * used so that the frame may be dropped if encryption would 2141 * have been expected. 2142 */ 2143 struct ieee80211_key *key = NULL; 2144 int i; 2145 2146 if (ieee80211_is_beacon(fc)) { 2147 key = ieee80211_rx_get_bigtk(rx, -1); 2148 } else if (ieee80211_is_mgmt(fc) && 2149 is_multicast_ether_addr(hdr->addr1)) { 2150 key = rcu_dereference(rx->link->default_mgmt_key); 2151 } else { 2152 if (rx->link_sta) { 2153 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2154 key = rcu_dereference(rx->link_sta->gtk[i]); 2155 if (key) 2156 break; 2157 } 2158 } 2159 if (!key) { 2160 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2161 key = rcu_dereference(rx->link->gtk[i]); 2162 if (key) 2163 break; 2164 } 2165 } 2166 } 2167 if (key) 2168 rx->key = key; 2169 return RX_CONTINUE; 2170 } else { 2171 /* 2172 * The device doesn't give us the IV so we won't be 2173 * able to look up the key. That's ok though, we 2174 * don't need to decrypt the frame, we just won't 2175 * be able to keep statistics accurate. 2176 * Except for key threshold notifications, should 2177 * we somehow allow the driver to tell us which key 2178 * the hardware used if this flag is set? 2179 */ 2180 if ((status->flag & RX_FLAG_DECRYPTED) && 2181 (status->flag & RX_FLAG_IV_STRIPPED)) 2182 return RX_CONTINUE; 2183 2184 keyidx = ieee80211_get_keyid(rx->skb); 2185 2186 if (unlikely(keyidx < 0)) 2187 return RX_DROP_U_NO_KEY_ID; 2188 2189 /* check per-station GTK first, if multicast packet */ 2190 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2191 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2192 2193 /* if not found, try default key */ 2194 if (!rx->key) { 2195 if (is_multicast_ether_addr(hdr->addr1)) 2196 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2197 if (!rx->key) 2198 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2199 2200 /* 2201 * RSNA-protected unicast frames should always be 2202 * sent with pairwise or station-to-station keys, 2203 * but for WEP we allow using a key index as well. 2204 */ 2205 if (rx->key && 2206 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2207 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2208 !is_multicast_ether_addr(hdr->addr1)) 2209 rx->key = NULL; 2210 } 2211 } 2212 2213 if (rx->key) { 2214 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2215 return RX_DROP_U_KEY_TAINTED; 2216 2217 /* TODO: add threshold stuff again */ 2218 } else { 2219 return RX_DROP_U_UNPROTECTED; 2220 } 2221 2222 switch (rx->key->conf.cipher) { 2223 case WLAN_CIPHER_SUITE_WEP40: 2224 case WLAN_CIPHER_SUITE_WEP104: 2225 result = ieee80211_crypto_wep_decrypt(rx); 2226 break; 2227 case WLAN_CIPHER_SUITE_TKIP: 2228 result = ieee80211_crypto_tkip_decrypt(rx); 2229 break; 2230 case WLAN_CIPHER_SUITE_CCMP: 2231 result = ieee80211_crypto_ccmp_decrypt( 2232 rx, IEEE80211_CCMP_MIC_LEN); 2233 break; 2234 case WLAN_CIPHER_SUITE_CCMP_256: 2235 result = ieee80211_crypto_ccmp_decrypt( 2236 rx, IEEE80211_CCMP_256_MIC_LEN); 2237 break; 2238 case WLAN_CIPHER_SUITE_AES_CMAC: 2239 result = ieee80211_crypto_aes_cmac_decrypt( 2240 rx, IEEE80211_CMAC_128_MIC_LEN); 2241 break; 2242 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2243 result = ieee80211_crypto_aes_cmac_decrypt( 2244 rx, IEEE80211_CMAC_256_MIC_LEN); 2245 break; 2246 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2247 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2248 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2249 break; 2250 case WLAN_CIPHER_SUITE_GCMP: 2251 case WLAN_CIPHER_SUITE_GCMP_256: 2252 result = ieee80211_crypto_gcmp_decrypt(rx); 2253 break; 2254 default: 2255 result = RX_DROP_U_BAD_CIPHER; 2256 } 2257 2258 /* the hdr variable is invalid after the decrypt handlers */ 2259 2260 /* either the frame has been decrypted or will be dropped */ 2261 status->flag |= RX_FLAG_DECRYPTED; 2262 2263 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2264 rx->sdata->dev)) 2265 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2266 skb->data, skb->len); 2267 2268 return result; 2269 } 2270 2271 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2272 { 2273 int i; 2274 2275 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2276 skb_queue_head_init(&cache->entries[i].skb_list); 2277 } 2278 2279 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2280 { 2281 int i; 2282 2283 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2284 __skb_queue_purge(&cache->entries[i].skb_list); 2285 } 2286 2287 static inline struct ieee80211_fragment_entry * 2288 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2289 unsigned int frag, unsigned int seq, int rx_queue, 2290 struct sk_buff **skb) 2291 { 2292 struct ieee80211_fragment_entry *entry; 2293 2294 entry = &cache->entries[cache->next++]; 2295 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2296 cache->next = 0; 2297 2298 __skb_queue_purge(&entry->skb_list); 2299 2300 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2301 *skb = NULL; 2302 entry->first_frag_time = jiffies; 2303 entry->seq = seq; 2304 entry->rx_queue = rx_queue; 2305 entry->last_frag = frag; 2306 entry->check_sequential_pn = false; 2307 entry->extra_len = 0; 2308 2309 return entry; 2310 } 2311 2312 static inline struct ieee80211_fragment_entry * 2313 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2314 unsigned int frag, unsigned int seq, 2315 int rx_queue, struct ieee80211_hdr *hdr) 2316 { 2317 struct ieee80211_fragment_entry *entry; 2318 int i, idx; 2319 2320 idx = cache->next; 2321 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2322 struct ieee80211_hdr *f_hdr; 2323 struct sk_buff *f_skb; 2324 2325 idx--; 2326 if (idx < 0) 2327 idx = IEEE80211_FRAGMENT_MAX - 1; 2328 2329 entry = &cache->entries[idx]; 2330 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2331 entry->rx_queue != rx_queue || 2332 entry->last_frag + 1 != frag) 2333 continue; 2334 2335 f_skb = __skb_peek(&entry->skb_list); 2336 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2337 2338 /* 2339 * Check ftype and addresses are equal, else check next fragment 2340 */ 2341 if (((hdr->frame_control ^ f_hdr->frame_control) & 2342 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2343 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2344 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2345 continue; 2346 2347 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2348 __skb_queue_purge(&entry->skb_list); 2349 continue; 2350 } 2351 return entry; 2352 } 2353 2354 return NULL; 2355 } 2356 2357 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2358 { 2359 return rx->key && 2360 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2361 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2362 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2363 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2364 ieee80211_has_protected(fc); 2365 } 2366 2367 static ieee80211_rx_result debug_noinline 2368 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2369 { 2370 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2371 struct ieee80211_hdr *hdr; 2372 u16 sc; 2373 __le16 fc; 2374 unsigned int frag, seq; 2375 struct ieee80211_fragment_entry *entry; 2376 struct sk_buff *skb; 2377 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2378 2379 hdr = (struct ieee80211_hdr *)rx->skb->data; 2380 fc = hdr->frame_control; 2381 2382 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2383 return RX_CONTINUE; 2384 2385 sc = le16_to_cpu(hdr->seq_ctrl); 2386 frag = sc & IEEE80211_SCTL_FRAG; 2387 2388 if (rx->sta) 2389 cache = &rx->sta->frags; 2390 2391 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2392 goto out; 2393 2394 if (is_multicast_ether_addr(hdr->addr1)) 2395 return RX_DROP_U_MCAST_FRAGMENT; 2396 2397 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2398 2399 if (skb_linearize(rx->skb)) 2400 return RX_DROP_U_OOM; 2401 2402 /* 2403 * skb_linearize() might change the skb->data and 2404 * previously cached variables (in this case, hdr) need to 2405 * be refreshed with the new data. 2406 */ 2407 hdr = (struct ieee80211_hdr *)rx->skb->data; 2408 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2409 2410 if (frag == 0) { 2411 /* This is the first fragment of a new frame. */ 2412 entry = ieee80211_reassemble_add(cache, frag, seq, 2413 rx->seqno_idx, &(rx->skb)); 2414 if (requires_sequential_pn(rx, fc)) { 2415 int queue = rx->security_idx; 2416 2417 /* Store CCMP/GCMP PN so that we can verify that the 2418 * next fragment has a sequential PN value. 2419 */ 2420 entry->check_sequential_pn = true; 2421 entry->is_protected = true; 2422 entry->key_color = rx->key->color; 2423 memcpy(entry->last_pn, 2424 rx->key->u.ccmp.rx_pn[queue], 2425 IEEE80211_CCMP_PN_LEN); 2426 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2427 u.ccmp.rx_pn) != 2428 offsetof(struct ieee80211_key, 2429 u.gcmp.rx_pn)); 2430 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2431 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2432 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2433 IEEE80211_GCMP_PN_LEN); 2434 } else if (rx->key && 2435 (ieee80211_has_protected(fc) || 2436 (status->flag & RX_FLAG_DECRYPTED))) { 2437 entry->is_protected = true; 2438 entry->key_color = rx->key->color; 2439 } 2440 return RX_QUEUED; 2441 } 2442 2443 /* This is a fragment for a frame that should already be pending in 2444 * fragment cache. Add this fragment to the end of the pending entry. 2445 */ 2446 entry = ieee80211_reassemble_find(cache, frag, seq, 2447 rx->seqno_idx, hdr); 2448 if (!entry) { 2449 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2450 return RX_DROP_U_DEFRAG_MISMATCH; 2451 } 2452 2453 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2454 * MPDU PN values are not incrementing in steps of 1." 2455 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2456 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2457 */ 2458 if (entry->check_sequential_pn) { 2459 int i; 2460 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2461 2462 if (!requires_sequential_pn(rx, fc)) 2463 return RX_DROP_U_NONSEQ_PN; 2464 2465 /* Prevent mixed key and fragment cache attacks */ 2466 if (entry->key_color != rx->key->color) 2467 return RX_DROP_U_BAD_KEY_COLOR; 2468 2469 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2470 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2471 pn[i]++; 2472 if (pn[i]) 2473 break; 2474 } 2475 2476 rpn = rx->ccm_gcm.pn; 2477 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2478 return RX_DROP_U_REPLAY; 2479 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2480 } else if (entry->is_protected && 2481 (!rx->key || 2482 (!ieee80211_has_protected(fc) && 2483 !(status->flag & RX_FLAG_DECRYPTED)) || 2484 rx->key->color != entry->key_color)) { 2485 /* Drop this as a mixed key or fragment cache attack, even 2486 * if for TKIP Michael MIC should protect us, and WEP is a 2487 * lost cause anyway. 2488 */ 2489 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2490 } else if (entry->is_protected && rx->key && 2491 entry->key_color != rx->key->color && 2492 (status->flag & RX_FLAG_DECRYPTED)) { 2493 return RX_DROP_U_BAD_KEY_COLOR; 2494 } 2495 2496 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2497 __skb_queue_tail(&entry->skb_list, rx->skb); 2498 entry->last_frag = frag; 2499 entry->extra_len += rx->skb->len; 2500 if (ieee80211_has_morefrags(fc)) { 2501 rx->skb = NULL; 2502 return RX_QUEUED; 2503 } 2504 2505 rx->skb = __skb_dequeue(&entry->skb_list); 2506 if (skb_tailroom(rx->skb) < entry->extra_len) { 2507 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2508 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2509 GFP_ATOMIC))) { 2510 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2511 __skb_queue_purge(&entry->skb_list); 2512 return RX_DROP_U_OOM; 2513 } 2514 } 2515 while ((skb = __skb_dequeue(&entry->skb_list))) { 2516 skb_put_data(rx->skb, skb->data, skb->len); 2517 dev_kfree_skb(skb); 2518 } 2519 2520 out: 2521 ieee80211_led_rx(rx->local); 2522 if (rx->sta) 2523 rx->link_sta->rx_stats.packets++; 2524 return RX_CONTINUE; 2525 } 2526 2527 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2528 { 2529 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2530 return -EACCES; 2531 2532 return 0; 2533 } 2534 2535 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2536 { 2537 struct sk_buff *skb = rx->skb; 2538 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2539 2540 /* 2541 * Pass through unencrypted frames if the hardware has 2542 * decrypted them already. 2543 */ 2544 if (status->flag & RX_FLAG_DECRYPTED) 2545 return 0; 2546 2547 /* Drop unencrypted frames if key is set. */ 2548 if (unlikely(!ieee80211_has_protected(fc) && 2549 !ieee80211_is_any_nullfunc(fc) && 2550 ieee80211_is_data(fc) && rx->key)) 2551 return -EACCES; 2552 2553 return 0; 2554 } 2555 2556 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2557 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2558 { 2559 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2560 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2561 __le16 fc = mgmt->frame_control; 2562 2563 /* 2564 * Pass through unencrypted frames if the hardware has 2565 * decrypted them already. 2566 */ 2567 if (status->flag & RX_FLAG_DECRYPTED) 2568 return RX_CONTINUE; 2569 2570 /* drop unicast protected dual (that wasn't protected) */ 2571 if (ieee80211_is_action(fc) && 2572 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2573 return RX_DROP_U_UNPROT_DUAL; 2574 2575 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2576 if (unlikely(!ieee80211_has_protected(fc) && 2577 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2578 if (ieee80211_is_deauth(fc) || 2579 ieee80211_is_disassoc(fc)) { 2580 /* 2581 * Permit unprotected deauth/disassoc frames 2582 * during 4-way-HS (key is installed after HS). 2583 */ 2584 if (!rx->key) 2585 return RX_CONTINUE; 2586 2587 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2588 rx->skb->data, 2589 rx->skb->len); 2590 } 2591 return RX_DROP_U_UNPROT_UCAST_MGMT; 2592 } 2593 /* BIP does not use Protected field, so need to check MMIE */ 2594 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2595 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2596 if (ieee80211_is_deauth(fc) || 2597 ieee80211_is_disassoc(fc)) 2598 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2599 rx->skb->data, 2600 rx->skb->len); 2601 return RX_DROP_U_UNPROT_MCAST_MGMT; 2602 } 2603 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2604 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2605 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2606 rx->skb->data, 2607 rx->skb->len); 2608 return RX_DROP_U_UNPROT_BEACON; 2609 } 2610 /* 2611 * When using MFP, Action frames are not allowed prior to 2612 * having configured keys. 2613 */ 2614 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2615 ieee80211_is_robust_mgmt_frame(rx->skb))) 2616 return RX_DROP_U_UNPROT_ACTION; 2617 2618 /* drop unicast public action frames when using MPF */ 2619 if (is_unicast_ether_addr(mgmt->da) && 2620 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2621 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2622 } 2623 2624 /* 2625 * Drop robust action frames before assoc regardless of MFP state, 2626 * after assoc we also have decided on MFP or not. 2627 */ 2628 if (ieee80211_is_action(fc) && 2629 ieee80211_is_robust_mgmt_frame(rx->skb) && 2630 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2631 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2632 2633 /* 2634 * Drop unprotected (Re)Association Request/Response frame received from 2635 * an EPP Peer. 2636 */ 2637 if (!ieee80211_has_protected(fc) && 2638 ieee80211_require_encrypted_assoc(fc, rx->sta)) 2639 return RX_DROP_U_UNPROT_UCAST_MGMT; 2640 2641 return RX_CONTINUE; 2642 } 2643 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2644 2645 static ieee80211_rx_result 2646 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2647 { 2648 struct ieee80211_sub_if_data *sdata = rx->sdata; 2649 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2650 bool check_port_control = false; 2651 struct ethhdr *ehdr; 2652 int ret; 2653 2654 *port_control = false; 2655 if (ieee80211_has_a4(hdr->frame_control) && 2656 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2657 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2658 2659 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2660 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2661 if (!sdata->u.mgd.use_4addr) 2662 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2663 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2664 check_port_control = true; 2665 } 2666 2667 if (is_multicast_ether_addr(hdr->addr1) && 2668 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2669 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2670 2671 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2672 if (ret < 0) 2673 return RX_DROP_U_INVALID_8023; 2674 2675 ehdr = (struct ethhdr *) rx->skb->data; 2676 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2677 *port_control = true; 2678 else if (check_port_control) 2679 return RX_DROP_U_NOT_PORT_CONTROL; 2680 2681 return RX_CONTINUE; 2682 } 2683 2684 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2685 const u8 *addr, int *out_link_id) 2686 { 2687 unsigned int link_id; 2688 2689 /* non-MLO, or MLD address replaced by hardware */ 2690 if (ether_addr_equal(sdata->vif.addr, addr)) 2691 return true; 2692 2693 if (!ieee80211_vif_is_mld(&sdata->vif)) 2694 return false; 2695 2696 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2697 struct ieee80211_bss_conf *conf; 2698 2699 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2700 2701 if (!conf) 2702 continue; 2703 if (ether_addr_equal(conf->addr, addr)) { 2704 if (out_link_id) 2705 *out_link_id = link_id; 2706 return true; 2707 } 2708 } 2709 2710 return false; 2711 } 2712 2713 /* 2714 * requires that rx->skb is a frame with ethernet header 2715 */ 2716 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2717 { 2718 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2719 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2720 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2721 2722 /* 2723 * Allow EAPOL frames to us/the PAE group address regardless of 2724 * whether the frame was encrypted or not, and always disallow 2725 * all other destination addresses for them. 2726 */ 2727 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2728 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2729 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2730 2731 if (ieee80211_802_1x_port_control(rx) || 2732 ieee80211_drop_unencrypted(rx, fc)) 2733 return false; 2734 2735 return true; 2736 } 2737 2738 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2739 struct ieee80211_rx_data *rx) 2740 { 2741 struct ieee80211_sub_if_data *sdata = rx->sdata; 2742 struct net_device *dev = sdata->dev; 2743 2744 if (unlikely((skb->protocol == sdata->control_port_protocol || 2745 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2746 !sdata->control_port_no_preauth)) && 2747 sdata->control_port_over_nl80211)) { 2748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2749 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2750 2751 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2752 dev_kfree_skb(skb); 2753 } else { 2754 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2755 2756 memset(skb->cb, 0, sizeof(skb->cb)); 2757 2758 /* 2759 * 802.1X over 802.11 requires that the authenticator address 2760 * be used for EAPOL frames. However, 802.1X allows the use of 2761 * the PAE group address instead. If the interface is part of 2762 * a bridge and we pass the frame with the PAE group address, 2763 * then the bridge will forward it to the network (even if the 2764 * client was not associated yet), which isn't supposed to 2765 * happen. 2766 * To avoid that, rewrite the destination address to our own 2767 * address, so that the authenticator (e.g. hostapd) will see 2768 * the frame, but bridge won't forward it anywhere else. Note 2769 * that due to earlier filtering, the only other address can 2770 * be the PAE group address, unless the hardware allowed them 2771 * through in 802.3 offloaded mode. 2772 */ 2773 if (unlikely(skb->protocol == sdata->control_port_protocol && 2774 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2775 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2776 2777 /* deliver to local stack */ 2778 if (rx->list) 2779 list_add_tail(&skb->list, rx->list); 2780 else 2781 netif_receive_skb(skb); 2782 } 2783 } 2784 2785 /* 2786 * requires that rx->skb is a frame with ethernet header 2787 */ 2788 static void 2789 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2790 { 2791 struct ieee80211_sub_if_data *sdata = rx->sdata; 2792 struct net_device *dev = sdata->dev; 2793 struct sk_buff *skb, *xmit_skb; 2794 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2795 struct sta_info *dsta; 2796 2797 skb = rx->skb; 2798 xmit_skb = NULL; 2799 2800 dev_sw_netstats_rx_add(dev, skb->len); 2801 2802 if (rx->sta) { 2803 /* The seqno index has the same property as needed 2804 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2805 * for non-QoS-data frames. Here we know it's a data 2806 * frame, so count MSDUs. 2807 */ 2808 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2809 u64_stats_inc(&rx->link_sta->rx_stats.msdu[rx->seqno_idx]); 2810 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2811 } 2812 2813 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2814 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2815 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2816 ehdr->h_proto != rx->sdata->control_port_protocol && 2817 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2818 if (is_multicast_ether_addr(ehdr->h_dest) && 2819 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2820 /* 2821 * send multicast frames both to higher layers in 2822 * local net stack and back to the wireless medium 2823 */ 2824 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2825 if (!xmit_skb) 2826 net_info_ratelimited("%s: failed to clone multicast frame\n", 2827 dev->name); 2828 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2829 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2830 dsta = sta_info_get(sdata, ehdr->h_dest); 2831 if (dsta) { 2832 /* 2833 * The destination station is associated to 2834 * this AP (in this VLAN), so send the frame 2835 * directly to it and do not pass it to local 2836 * net stack. 2837 */ 2838 xmit_skb = skb; 2839 skb = NULL; 2840 } 2841 } 2842 } 2843 2844 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2845 if (skb) { 2846 /* 'align' will only take the values 0 or 2 here since all 2847 * frames are required to be aligned to 2-byte boundaries 2848 * when being passed to mac80211; the code here works just 2849 * as well if that isn't true, but mac80211 assumes it can 2850 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2851 */ 2852 int align; 2853 2854 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2855 if (align) { 2856 if (WARN_ON(skb_headroom(skb) < 3)) { 2857 dev_kfree_skb(skb); 2858 skb = NULL; 2859 } else { 2860 u8 *data = skb->data; 2861 size_t len = skb_headlen(skb); 2862 skb->data -= align; 2863 memmove(skb->data, data, len); 2864 skb_set_tail_pointer(skb, len); 2865 } 2866 } 2867 } 2868 #endif 2869 2870 if (skb) { 2871 skb->protocol = eth_type_trans(skb, dev); 2872 ieee80211_deliver_skb_to_local_stack(skb, rx); 2873 } 2874 2875 if (xmit_skb) { 2876 /* 2877 * Send to wireless media and increase priority by 256 to 2878 * keep the received priority instead of reclassifying 2879 * the frame (see cfg80211_classify8021d). 2880 */ 2881 xmit_skb->priority += 256; 2882 xmit_skb->protocol = htons(ETH_P_802_3); 2883 skb_reset_network_header(xmit_skb); 2884 skb_reset_mac_header(xmit_skb); 2885 dev_queue_xmit(xmit_skb); 2886 } 2887 } 2888 2889 #ifdef CONFIG_MAC80211_MESH 2890 static bool 2891 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2892 struct sk_buff *skb, int hdrlen) 2893 { 2894 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2895 struct ieee80211_mesh_fast_tx_key key = { 2896 .type = MESH_FAST_TX_TYPE_FORWARDED 2897 }; 2898 struct ieee80211_mesh_fast_tx *entry; 2899 struct ieee80211s_hdr *mesh_hdr; 2900 struct tid_ampdu_tx *tid_tx; 2901 struct sta_info *sta; 2902 struct ethhdr eth; 2903 u8 tid; 2904 2905 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2906 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2907 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2908 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2909 ether_addr_copy(key.addr, skb->data); 2910 else 2911 return false; 2912 2913 entry = mesh_fast_tx_get(sdata, &key); 2914 if (!entry) 2915 return false; 2916 2917 sta = rcu_dereference(entry->mpath->next_hop); 2918 if (!sta) 2919 return false; 2920 2921 if (skb_linearize(skb)) 2922 return false; 2923 2924 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2925 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2926 if (tid_tx) { 2927 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2928 return false; 2929 2930 if (tid_tx->timeout) 2931 tid_tx->last_tx = jiffies; 2932 } 2933 2934 ieee80211_aggr_check(sdata, sta, skb); 2935 2936 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2937 &skb->protocol)) 2938 hdrlen += ETH_ALEN; 2939 else 2940 skb->protocol = htons(skb->len - hdrlen); 2941 skb_set_network_header(skb, hdrlen + 2); 2942 2943 skb->dev = sdata->dev; 2944 memcpy(ð, skb->data, ETH_HLEN - 2); 2945 skb_pull(skb, 2); 2946 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2947 eth.h_dest, eth.h_source); 2948 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2950 2951 return true; 2952 } 2953 #endif 2954 2955 static ieee80211_rx_result 2956 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2957 struct sk_buff *skb) 2958 { 2959 #ifdef CONFIG_MAC80211_MESH 2960 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2961 struct ieee80211_local *local = sdata->local; 2962 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2963 struct ieee80211_hdr hdr = { 2964 .frame_control = cpu_to_le16(fc) 2965 }; 2966 struct ieee80211_hdr *fwd_hdr; 2967 struct ieee80211s_hdr *mesh_hdr; 2968 struct ieee80211_tx_info *info; 2969 struct sk_buff *fwd_skb; 2970 struct ethhdr *eth; 2971 bool multicast; 2972 int tailroom = 0; 2973 int hdrlen, mesh_hdrlen; 2974 u8 *qos; 2975 2976 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2977 return RX_CONTINUE; 2978 2979 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2980 return RX_DROP_U_RUNT_MESH_DATA; 2981 2982 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2983 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2984 2985 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2986 return RX_DROP_U_RUNT_MESH_DATA; 2987 2988 eth = (struct ethhdr *)skb->data; 2989 multicast = is_multicast_ether_addr(eth->h_dest); 2990 2991 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2992 if (!mesh_hdr->ttl) 2993 return RX_DROP_U_MESH_NO_TTL; 2994 2995 /* frame is in RMC, don't forward */ 2996 if (is_multicast_ether_addr(eth->h_dest) && 2997 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 2998 return RX_DROP_U_MESH_RMC; 2999 3000 /* forward packet */ 3001 if (sdata->crypto_tx_tailroom_needed_cnt) 3002 tailroom = IEEE80211_ENCRYPT_TAILROOM; 3003 3004 if (mesh_hdr->flags & MESH_FLAGS_AE) { 3005 struct mesh_path *mppath; 3006 char *proxied_addr; 3007 bool update = false; 3008 3009 if (multicast) 3010 proxied_addr = mesh_hdr->eaddr1; 3011 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 3012 /* has_a4 already checked in ieee80211_rx_mesh_check */ 3013 proxied_addr = mesh_hdr->eaddr2; 3014 else 3015 return RX_DROP_U_MESH_BAD_AE; 3016 3017 rcu_read_lock(); 3018 mppath = mpp_path_lookup(sdata, proxied_addr); 3019 if (!mppath) { 3020 mpp_path_add(sdata, proxied_addr, eth->h_source); 3021 } else { 3022 spin_lock_bh(&mppath->state_lock); 3023 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 3024 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 3025 update = true; 3026 } 3027 mppath->exp_time = jiffies; 3028 spin_unlock_bh(&mppath->state_lock); 3029 } 3030 3031 /* flush fast xmit cache if the address path changed */ 3032 if (update) 3033 mesh_fast_tx_flush_addr(sdata, proxied_addr); 3034 3035 rcu_read_unlock(); 3036 } 3037 3038 /* Frame has reached destination. Don't forward */ 3039 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 3040 goto rx_accept; 3041 3042 if (!--mesh_hdr->ttl) { 3043 if (multicast) 3044 goto rx_accept; 3045 3046 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 3047 return RX_DROP_U_MESH_TTL_EXPIRED; 3048 } 3049 3050 if (!ifmsh->mshcfg.dot11MeshForwarding) { 3051 if (is_multicast_ether_addr(eth->h_dest)) 3052 goto rx_accept; 3053 3054 return RX_DROP_U_MESH_NOT_FORWARDING; 3055 } 3056 3057 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 3058 3059 if (!multicast && 3060 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 3061 return RX_QUEUED; 3062 3063 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 3064 eth->h_dest, eth->h_source); 3065 hdrlen = ieee80211_hdrlen(hdr.frame_control); 3066 if (multicast) { 3067 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 3068 3069 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 3070 IEEE80211_ENCRYPT_HEADROOM, 3071 tailroom, GFP_ATOMIC); 3072 if (!fwd_skb) 3073 goto rx_accept; 3074 } else { 3075 fwd_skb = skb; 3076 skb = NULL; 3077 3078 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 3079 return RX_DROP_U_OOM; 3080 3081 if (skb_linearize(fwd_skb)) 3082 return RX_DROP_U_OOM; 3083 } 3084 3085 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 3086 memcpy(fwd_hdr, &hdr, hdrlen - 2); 3087 qos = ieee80211_get_qos_ctl(fwd_hdr); 3088 qos[0] = qos[1] = 0; 3089 3090 skb_reset_mac_header(fwd_skb); 3091 hdrlen += mesh_hdrlen; 3092 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 3093 &fwd_skb->protocol)) 3094 hdrlen += ETH_ALEN; 3095 else 3096 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 3097 skb_set_network_header(fwd_skb, hdrlen + 2); 3098 3099 info = IEEE80211_SKB_CB(fwd_skb); 3100 memset(info, 0, sizeof(*info)); 3101 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3102 info->control.vif = &sdata->vif; 3103 info->control.jiffies = jiffies; 3104 fwd_skb->dev = sdata->dev; 3105 if (multicast) { 3106 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 3107 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 3108 /* update power mode indication when forwarding */ 3109 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 3110 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 3111 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3112 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3113 } else { 3114 /* unable to resolve next hop */ 3115 if (sta) 3116 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3117 hdr.addr3, 0, 3118 WLAN_REASON_MESH_PATH_NOFORWARD, 3119 sta->sta.addr); 3120 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3121 kfree_skb(fwd_skb); 3122 goto rx_accept; 3123 } 3124 3125 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3126 ieee80211_set_qos_hdr(sdata, fwd_skb); 3127 ieee80211_add_pending_skb(local, fwd_skb); 3128 3129 rx_accept: 3130 if (!skb) 3131 return RX_QUEUED; 3132 3133 ieee80211_strip_8023_mesh_hdr(skb); 3134 #endif 3135 3136 return RX_CONTINUE; 3137 } 3138 3139 static ieee80211_rx_result debug_noinline 3140 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3141 { 3142 struct net_device *dev = rx->sdata->dev; 3143 struct sk_buff *skb = rx->skb; 3144 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3145 __le16 fc = hdr->frame_control; 3146 struct sk_buff_head frame_list; 3147 struct ethhdr ethhdr; 3148 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3149 3150 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3151 check_da = NULL; 3152 check_sa = NULL; 3153 } else switch (rx->sdata->vif.type) { 3154 case NL80211_IFTYPE_AP: 3155 case NL80211_IFTYPE_AP_VLAN: 3156 check_da = NULL; 3157 break; 3158 case NL80211_IFTYPE_STATION: 3159 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3160 check_sa = NULL; 3161 break; 3162 case NL80211_IFTYPE_MESH_POINT: 3163 check_sa = NULL; 3164 check_da = NULL; 3165 break; 3166 default: 3167 break; 3168 } 3169 3170 skb->dev = dev; 3171 __skb_queue_head_init(&frame_list); 3172 3173 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3174 rx->sdata->vif.addr, 3175 rx->sdata->vif.type, 3176 data_offset, true)) 3177 return RX_DROP_U_BAD_AMSDU; 3178 3179 if (rx->sta->amsdu_mesh_control < 0) { 3180 s8 valid = -1; 3181 int i; 3182 3183 for (i = 0; i <= 2; i++) { 3184 if (!ieee80211_is_valid_amsdu(skb, i)) 3185 continue; 3186 3187 if (valid >= 0) { 3188 /* ambiguous */ 3189 valid = -1; 3190 break; 3191 } 3192 3193 valid = i; 3194 } 3195 3196 rx->sta->amsdu_mesh_control = valid; 3197 } 3198 3199 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3200 rx->sdata->vif.type, 3201 rx->local->hw.extra_tx_headroom, 3202 check_da, check_sa, 3203 rx->sta->amsdu_mesh_control); 3204 3205 while (!skb_queue_empty(&frame_list)) { 3206 rx->skb = __skb_dequeue(&frame_list); 3207 3208 switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) { 3209 case RX_QUEUED: 3210 break; 3211 case RX_CONTINUE: 3212 if (ieee80211_frame_allowed(rx, fc)) { 3213 ieee80211_deliver_skb(rx); 3214 break; 3215 } 3216 fallthrough; 3217 default: 3218 dev_kfree_skb(rx->skb); 3219 } 3220 } 3221 3222 return RX_QUEUED; 3223 } 3224 3225 static ieee80211_rx_result debug_noinline 3226 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3227 { 3228 struct sk_buff *skb = rx->skb; 3229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3230 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3231 __le16 fc = hdr->frame_control; 3232 3233 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3234 return RX_CONTINUE; 3235 3236 if (unlikely(!ieee80211_is_data(fc))) 3237 return RX_CONTINUE; 3238 3239 if (unlikely(!ieee80211_is_data_present(fc))) 3240 return RX_DROP_U_AMSDU_WITHOUT_DATA; 3241 3242 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3243 switch (rx->sdata->vif.type) { 3244 case NL80211_IFTYPE_AP_VLAN: 3245 if (!rx->sdata->u.vlan.sta) 3246 return RX_DROP_U_BAD_4ADDR; 3247 break; 3248 case NL80211_IFTYPE_STATION: 3249 if (!rx->sdata->u.mgd.use_4addr) 3250 return RX_DROP_U_BAD_4ADDR; 3251 break; 3252 case NL80211_IFTYPE_MESH_POINT: 3253 break; 3254 default: 3255 return RX_DROP_U_BAD_4ADDR; 3256 } 3257 } 3258 3259 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3260 return RX_DROP_U_BAD_AMSDU; 3261 3262 if (rx->key) { 3263 /* 3264 * We should not receive A-MSDUs on pre-HT connections, 3265 * and HT connections cannot use old ciphers. Thus drop 3266 * them, as in those cases we couldn't even have SPP 3267 * A-MSDUs or such. 3268 */ 3269 switch (rx->key->conf.cipher) { 3270 case WLAN_CIPHER_SUITE_WEP40: 3271 case WLAN_CIPHER_SUITE_WEP104: 3272 case WLAN_CIPHER_SUITE_TKIP: 3273 return RX_DROP_U_BAD_AMSDU_CIPHER; 3274 default: 3275 break; 3276 } 3277 } 3278 3279 return __ieee80211_rx_h_amsdu(rx, 0); 3280 } 3281 3282 static ieee80211_rx_result debug_noinline 3283 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3284 { 3285 struct ieee80211_sub_if_data *sdata = rx->sdata; 3286 struct ieee80211_local *local = rx->local; 3287 struct net_device *dev = sdata->dev; 3288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3289 __le16 fc = hdr->frame_control; 3290 ieee80211_rx_result res; 3291 bool port_control; 3292 3293 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3294 return RX_CONTINUE; 3295 3296 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3297 return RX_DROP_U_NULL_DATA; 3298 3299 /* Send unexpected-4addr-frame event to hostapd */ 3300 if (ieee80211_has_a4(hdr->frame_control) && 3301 sdata->vif.type == NL80211_IFTYPE_AP) { 3302 if (rx->sta && 3303 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3304 cfg80211_rx_unexpected_4addr_frame( 3305 rx->sdata->dev, rx->sta->sta.addr, rx->link_id, 3306 GFP_ATOMIC); 3307 return RX_DROP_U_UNEXPECTED_4ADDR; 3308 } 3309 3310 res = __ieee80211_data_to_8023(rx, &port_control); 3311 if (unlikely(res != RX_CONTINUE)) 3312 return res; 3313 3314 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3315 if (res != RX_CONTINUE) 3316 return res; 3317 3318 if (!ieee80211_frame_allowed(rx, fc)) 3319 return RX_DROP_U_PORT_CONTROL; 3320 3321 /* directly handle TDLS channel switch requests/responses */ 3322 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3323 cpu_to_be16(ETH_P_TDLS))) { 3324 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3325 3326 if (pskb_may_pull(rx->skb, 3327 offsetof(struct ieee80211_tdls_data, u)) && 3328 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3329 tf->category == WLAN_CATEGORY_TDLS && 3330 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3331 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3332 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3333 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3334 rx->sta, rx->skb); 3335 return RX_QUEUED; 3336 } 3337 } 3338 3339 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3340 unlikely(port_control) && sdata->bss) { 3341 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3342 u.ap); 3343 dev = sdata->dev; 3344 rx->sdata = sdata; 3345 } 3346 3347 rx->skb->dev = dev; 3348 3349 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3350 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3351 !is_multicast_ether_addr( 3352 ((struct ethhdr *)rx->skb->data)->h_dest) && 3353 (!local->scanning && 3354 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3355 mod_timer(&local->dynamic_ps_timer, jiffies + 3356 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3357 3358 ieee80211_deliver_skb(rx); 3359 3360 return RX_QUEUED; 3361 } 3362 3363 static ieee80211_rx_result debug_noinline 3364 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3365 { 3366 struct sk_buff *skb = rx->skb; 3367 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3368 struct tid_ampdu_rx *tid_agg_rx; 3369 u16 start_seq_num; 3370 u16 tid; 3371 3372 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3373 return RX_CONTINUE; 3374 3375 if (ieee80211_is_back_req(bar->frame_control)) { 3376 struct { 3377 __le16 control, start_seq_num; 3378 } __packed bar_data; 3379 struct ieee80211_event event = { 3380 .type = BAR_RX_EVENT, 3381 }; 3382 3383 if (!rx->sta) 3384 return RX_DROP_U_UNKNOWN_STA; 3385 3386 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3387 &bar_data, sizeof(bar_data))) 3388 return RX_DROP_U_RUNT_BAR; 3389 3390 tid = le16_to_cpu(bar_data.control) >> 12; 3391 3392 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3393 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3394 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3395 WLAN_BACK_RECIPIENT, 3396 WLAN_REASON_QSTA_REQUIRE_SETUP, 3397 ieee80211_s1g_use_ndp_ba(rx->sdata, 3398 rx->sta)); 3399 3400 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3401 if (!tid_agg_rx) 3402 return RX_DROP_U_BAR_OUTSIDE_SESSION; 3403 3404 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3405 event.u.ba.tid = tid; 3406 event.u.ba.ssn = start_seq_num; 3407 event.u.ba.sta = &rx->sta->sta; 3408 3409 /* reset session timer */ 3410 if (tid_agg_rx->timeout) 3411 mod_timer(&tid_agg_rx->session_timer, 3412 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3413 3414 spin_lock(&tid_agg_rx->reorder_lock); 3415 /* release stored frames up to start of BAR */ 3416 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3417 start_seq_num, frames); 3418 spin_unlock(&tid_agg_rx->reorder_lock); 3419 3420 drv_event_callback(rx->local, rx->sdata, &event); 3421 3422 kfree_skb(skb); 3423 return RX_QUEUED; 3424 } 3425 3426 return RX_DROP_U_CTRL_FRAME; 3427 } 3428 3429 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3430 struct ieee80211_mgmt *mgmt, 3431 size_t len) 3432 { 3433 struct ieee80211_local *local = sdata->local; 3434 struct sk_buff *skb; 3435 struct ieee80211_mgmt *resp; 3436 3437 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3438 /* Not to own unicast address */ 3439 return; 3440 } 3441 3442 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3443 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3444 /* Not from the current AP or not associated yet. */ 3445 return; 3446 } 3447 3448 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) { 3449 /* Too short SA Query request frame */ 3450 return; 3451 } 3452 3453 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3454 if (skb == NULL) 3455 return; 3456 3457 skb_reserve(skb, local->hw.extra_tx_headroom); 3458 resp = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(sa_query)); 3459 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3460 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3461 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3462 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3463 IEEE80211_STYPE_ACTION); 3464 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3465 resp->u.action.action_code = WLAN_ACTION_SA_QUERY_RESPONSE; 3466 memcpy(resp->u.action.sa_query.trans_id, 3467 mgmt->u.action.sa_query.trans_id, 3468 WLAN_SA_QUERY_TR_ID_LEN); 3469 3470 ieee80211_tx_skb(sdata, skb); 3471 } 3472 3473 static void 3474 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3475 { 3476 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3477 struct ieee80211_bss_conf *bss_conf; 3478 const struct element *ie; 3479 size_t baselen; 3480 3481 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3482 NL80211_EXT_FEATURE_BSS_COLOR)) 3483 return; 3484 3485 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3486 return; 3487 3488 bss_conf = rx->link->conf; 3489 if (bss_conf->csa_active || bss_conf->color_change_active || 3490 !bss_conf->he_bss_color.enabled) 3491 return; 3492 3493 baselen = mgmt->u.beacon.variable - rx->skb->data; 3494 if (baselen > rx->skb->len) 3495 return; 3496 3497 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3498 mgmt->u.beacon.variable, 3499 rx->skb->len - baselen); 3500 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3501 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3502 const struct ieee80211_he_operation *he_oper; 3503 u8 color; 3504 3505 he_oper = (void *)(ie->data + 1); 3506 if (le32_get_bits(he_oper->he_oper_params, 3507 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3508 return; 3509 3510 color = le32_get_bits(he_oper->he_oper_params, 3511 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3512 if (color == bss_conf->he_bss_color.color) 3513 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3514 BIT_ULL(color), 3515 bss_conf->link_id); 3516 } 3517 } 3518 3519 static ieee80211_rx_result debug_noinline 3520 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3521 { 3522 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3524 3525 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3526 return RX_CONTINUE; 3527 3528 /* 3529 * From here on, look only at management frames. 3530 * Data and control frames are already handled, 3531 * and unknown (reserved) frames are useless. 3532 */ 3533 if (rx->skb->len < 24) 3534 return RX_DROP_U_RUNT_MGMT; 3535 3536 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3537 return RX_DROP_U_EXPECTED_MGMT; 3538 3539 /* drop too small action frames */ 3540 if (ieee80211_is_action(mgmt->frame_control) && 3541 rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category)) 3542 return RX_DROP_U_RUNT_ACTION; 3543 3544 /* Drop non-broadcast Beacon frames */ 3545 if (ieee80211_is_beacon(mgmt->frame_control) && 3546 !is_broadcast_ether_addr(mgmt->da)) 3547 return RX_DROP_U_NONBCAST_BEACON; 3548 3549 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3550 ieee80211_is_beacon(mgmt->frame_control) && 3551 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3552 int sig = 0; 3553 3554 /* sw bss color collision detection */ 3555 ieee80211_rx_check_bss_color_collision(rx); 3556 3557 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3558 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3559 sig = status->signal; 3560 3561 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3562 rx->skb->data, rx->skb->len, 3563 ieee80211_rx_status_to_khz(status), 3564 sig); 3565 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3566 } 3567 3568 return ieee80211_drop_unencrypted_mgmt(rx); 3569 } 3570 3571 static bool 3572 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3573 { 3574 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3575 struct ieee80211_sub_if_data *sdata = rx->sdata; 3576 3577 /* TWT actions are only supported in AP for the moment */ 3578 if (sdata->vif.type != NL80211_IFTYPE_AP) 3579 return false; 3580 3581 if (!rx->local->ops->add_twt_setup) 3582 return false; 3583 3584 if (!sdata->vif.bss_conf.twt_responder) 3585 return false; 3586 3587 if (!rx->sta) 3588 return false; 3589 3590 switch (mgmt->u.action.action_code) { 3591 case WLAN_S1G_TWT_SETUP: { 3592 struct ieee80211_twt_setup *twt; 3593 3594 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3595 sizeof(struct ieee80211_twt_setup) + 3596 2 /* TWT req_type agrt */) 3597 break; 3598 3599 twt = (void *)mgmt->u.action.s1g.variable; 3600 if (twt->element_id != WLAN_EID_S1G_TWT) 3601 break; 3602 3603 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3604 3 + /* token + tlv */ 3605 twt->length) 3606 break; 3607 3608 return true; /* queue the frame */ 3609 } 3610 case WLAN_S1G_TWT_TEARDOWN: 3611 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 1) 3612 break; 3613 3614 return true; /* queue the frame */ 3615 default: 3616 break; 3617 } 3618 3619 return false; 3620 } 3621 3622 static ieee80211_rx_result debug_noinline 3623 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3624 { 3625 struct ieee80211_local *local = rx->local; 3626 struct ieee80211_sub_if_data *sdata = rx->sdata; 3627 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3628 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3629 int len = rx->skb->len; 3630 3631 if (!ieee80211_is_action(mgmt->frame_control)) 3632 return RX_CONTINUE; 3633 3634 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3635 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3636 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3637 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3638 3639 switch (mgmt->u.action.category) { 3640 case WLAN_CATEGORY_HT: 3641 /* reject HT action frames from stations not supporting HT 3642 * or not HE Capable 3643 */ 3644 if (!rx->link_sta->pub->ht_cap.ht_supported && 3645 !rx->link_sta->pub->he_cap.has_he) 3646 goto invalid; 3647 3648 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3649 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3650 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3651 sdata->vif.type != NL80211_IFTYPE_AP && 3652 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3653 break; 3654 3655 /* verify action & smps_control/chanwidth are present */ 3656 if (len < IEEE80211_MIN_ACTION_SIZE(ht_smps)) 3657 goto invalid; 3658 3659 switch (mgmt->u.action.action_code) { 3660 case WLAN_HT_ACTION_SMPS: { 3661 struct ieee80211_supported_band *sband; 3662 enum ieee80211_smps_mode smps_mode; 3663 struct sta_opmode_info sta_opmode = {}; 3664 3665 if (sdata->vif.type != NL80211_IFTYPE_AP && 3666 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3667 goto handled; 3668 3669 /* convert to HT capability */ 3670 switch (mgmt->u.action.ht_smps.smps_control) { 3671 case WLAN_HT_SMPS_CONTROL_DISABLED: 3672 smps_mode = IEEE80211_SMPS_OFF; 3673 break; 3674 case WLAN_HT_SMPS_CONTROL_STATIC: 3675 smps_mode = IEEE80211_SMPS_STATIC; 3676 break; 3677 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3678 smps_mode = IEEE80211_SMPS_DYNAMIC; 3679 break; 3680 default: 3681 goto invalid; 3682 } 3683 3684 /* if no change do nothing */ 3685 if (rx->link_sta->pub->smps_mode == smps_mode) 3686 goto handled; 3687 rx->link_sta->pub->smps_mode = smps_mode; 3688 sta_opmode.smps_mode = 3689 ieee80211_smps_mode_to_smps_mode(smps_mode); 3690 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3691 3692 sband = rx->local->hw.wiphy->bands[status->band]; 3693 3694 rate_control_rate_update(local, sband, rx->link_sta, 3695 IEEE80211_RC_SMPS_CHANGED); 3696 cfg80211_sta_opmode_change_notify(sdata->dev, 3697 rx->sta->addr, 3698 &sta_opmode, 3699 GFP_ATOMIC); 3700 goto handled; 3701 } 3702 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3703 u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth; 3704 3705 if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ && 3706 chanwidth != IEEE80211_HT_CHANWIDTH_ANY) 3707 goto invalid; 3708 3709 /* If it doesn't support 40 MHz it can't change ... */ 3710 if (!(rx->link_sta->pub->ht_cap.cap & 3711 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3712 goto handled; 3713 3714 goto queue; 3715 } 3716 default: 3717 goto invalid; 3718 } 3719 3720 break; 3721 case WLAN_CATEGORY_PUBLIC: 3722 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3723 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3724 goto invalid; 3725 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3726 break; 3727 if (!rx->sta) 3728 break; 3729 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3730 break; 3731 if (mgmt->u.action.action_code != 3732 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3733 break; 3734 if (len < IEEE80211_MIN_ACTION_SIZE(ext_chan_switch)) 3735 goto invalid; 3736 goto queue; 3737 case WLAN_CATEGORY_VHT: 3738 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3739 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3740 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3741 sdata->vif.type != NL80211_IFTYPE_AP && 3742 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3743 break; 3744 3745 /* verify action code is present */ 3746 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3747 goto invalid; 3748 3749 switch (mgmt->u.action.action_code) { 3750 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3751 /* verify opmode is present */ 3752 if (len < IEEE80211_MIN_ACTION_SIZE(vht_opmode_notif)) 3753 goto invalid; 3754 goto queue; 3755 } 3756 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3757 if (len < IEEE80211_MIN_ACTION_SIZE(vht_group_notif)) 3758 goto invalid; 3759 goto queue; 3760 } 3761 default: 3762 break; 3763 } 3764 break; 3765 case WLAN_CATEGORY_BACK: 3766 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3767 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3768 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3769 sdata->vif.type != NL80211_IFTYPE_AP && 3770 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3771 sdata->vif.type != NL80211_IFTYPE_NAN_DATA) 3772 break; 3773 3774 /* verify action_code is present */ 3775 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3776 break; 3777 3778 switch (mgmt->u.action.action_code) { 3779 case WLAN_ACTION_ADDBA_REQ: 3780 case WLAN_ACTION_NDP_ADDBA_REQ: 3781 if (len < IEEE80211_MIN_ACTION_SIZE(addba_req)) 3782 goto invalid; 3783 break; 3784 case WLAN_ACTION_ADDBA_RESP: 3785 case WLAN_ACTION_NDP_ADDBA_RESP: 3786 if (len < IEEE80211_MIN_ACTION_SIZE(addba_resp)) 3787 goto invalid; 3788 break; 3789 case WLAN_ACTION_DELBA: 3790 case WLAN_ACTION_NDP_DELBA: 3791 if (len < IEEE80211_MIN_ACTION_SIZE(delba)) 3792 goto invalid; 3793 break; 3794 default: 3795 goto invalid; 3796 } 3797 3798 goto queue; 3799 case WLAN_CATEGORY_SPECTRUM_MGMT: 3800 /* verify action_code is present */ 3801 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3802 break; 3803 3804 switch (mgmt->u.action.action_code) { 3805 case WLAN_ACTION_SPCT_MSR_REQ: 3806 if (status->band != NL80211_BAND_5GHZ) 3807 break; 3808 3809 if (len < IEEE80211_MIN_ACTION_SIZE(measurement)) 3810 break; 3811 3812 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3813 break; 3814 3815 ieee80211_process_measurement_req(sdata, mgmt, len); 3816 goto handled; 3817 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3818 u8 *bssid; 3819 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 3820 break; 3821 3822 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3823 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3824 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3825 break; 3826 3827 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3828 bssid = sdata->deflink.u.mgd.bssid; 3829 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3830 bssid = sdata->u.ibss.bssid; 3831 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3832 bssid = mgmt->sa; 3833 else 3834 break; 3835 3836 if (!ether_addr_equal(mgmt->bssid, bssid)) 3837 break; 3838 3839 goto queue; 3840 } 3841 } 3842 break; 3843 case WLAN_CATEGORY_SELF_PROTECTED: 3844 if (len < IEEE80211_MIN_ACTION_SIZE(self_prot)) 3845 break; 3846 3847 switch (mgmt->u.action.action_code) { 3848 case WLAN_SP_MESH_PEERING_OPEN: 3849 case WLAN_SP_MESH_PEERING_CLOSE: 3850 case WLAN_SP_MESH_PEERING_CONFIRM: 3851 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3852 goto invalid; 3853 if (sdata->u.mesh.user_mpm) 3854 /* userspace handles this frame */ 3855 break; 3856 goto queue; 3857 case WLAN_SP_MGK_INFORM: 3858 case WLAN_SP_MGK_ACK: 3859 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3860 goto invalid; 3861 break; 3862 } 3863 break; 3864 case WLAN_CATEGORY_MESH_ACTION: 3865 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3866 break; 3867 3868 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3869 break; 3870 if (mesh_action_is_path_sel(mgmt) && 3871 !mesh_path_sel_is_hwmp(sdata)) 3872 break; 3873 goto queue; 3874 case WLAN_CATEGORY_S1G: 3875 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3876 break; 3877 3878 switch (mgmt->u.action.action_code) { 3879 case WLAN_S1G_TWT_SETUP: 3880 case WLAN_S1G_TWT_TEARDOWN: 3881 if (ieee80211_process_rx_twt_action(rx)) 3882 goto queue; 3883 break; 3884 default: 3885 break; 3886 } 3887 break; 3888 case WLAN_CATEGORY_PROTECTED_EHT: 3889 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3890 break; 3891 3892 switch (mgmt->u.action.action_code) { 3893 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3894 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3895 break; 3896 3897 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_req)) 3898 goto invalid; 3899 goto queue; 3900 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3901 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3902 break; 3903 3904 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_res)) 3905 goto invalid; 3906 goto queue; 3907 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3908 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3909 break; 3910 3911 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_tear_down)) 3912 goto invalid; 3913 goto queue; 3914 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3915 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3916 break; 3917 3918 /* The reconfiguration response action frame must 3919 * least one 'Status Duple' entry (3 octets) 3920 */ 3921 if (len < IEEE80211_MIN_ACTION_SIZE(ml_reconf_resp) + 3) 3922 goto invalid; 3923 goto queue; 3924 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3925 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3926 break; 3927 3928 if (len < IEEE80211_MIN_ACTION_SIZE(epcs) + 3929 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3930 goto invalid; 3931 goto queue; 3932 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3933 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3934 break; 3935 3936 if (len < IEEE80211_MIN_ACTION_SIZE(epcs)) 3937 goto invalid; 3938 goto queue; 3939 case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF: 3940 if (sdata->vif.type != NL80211_IFTYPE_AP) 3941 break; 3942 3943 if (len < IEEE80211_MIN_ACTION_SIZE(eml_omn)) 3944 goto invalid; 3945 goto queue; 3946 default: 3947 break; 3948 } 3949 break; 3950 case WLAN_CATEGORY_PROTECTED_UHR: 3951 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3952 break; 3953 3954 switch (mgmt->u.action.action_code) { 3955 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_REQUEST: 3956 if (sdata->vif.type != NL80211_IFTYPE_AP) 3957 break; 3958 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_req)) 3959 goto invalid; 3960 if (mgmt->u.action.uhr_link_reconf_req.type != 3961 IEEE80211_UHR_LINK_RECONFIG_REQUEST_OMP_REQUEST) 3962 break; 3963 goto queue; 3964 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_NOTIFY: 3965 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3966 break; 3967 3968 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_notif)) 3969 goto invalid; 3970 goto queue; 3971 } 3972 break; 3973 } 3974 3975 return RX_CONTINUE; 3976 3977 invalid: 3978 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3979 /* will return in the next handlers */ 3980 return RX_CONTINUE; 3981 3982 handled: 3983 if (rx->sta) 3984 rx->link_sta->rx_stats.packets++; 3985 dev_kfree_skb(rx->skb); 3986 return RX_QUEUED; 3987 3988 queue: 3989 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3990 return RX_QUEUED; 3991 } 3992 3993 static ieee80211_rx_result debug_noinline 3994 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3995 { 3996 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3997 struct cfg80211_rx_info info = { 3998 .freq = ieee80211_rx_status_to_khz(status), 3999 .buf = rx->skb->data, 4000 .len = rx->skb->len, 4001 .link_id = rx->link_id, 4002 .have_link_id = rx->link_id >= 0, 4003 }; 4004 4005 /* skip known-bad action frames and return them in the next handler */ 4006 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 4007 return RX_CONTINUE; 4008 4009 /* 4010 * Getting here means the kernel doesn't know how to handle 4011 * it, but maybe userspace does ... include returned frames 4012 * so userspace can register for those to know whether ones 4013 * it transmitted were processed or returned. 4014 */ 4015 4016 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 4017 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 4018 info.sig_dbm = status->signal; 4019 4020 if (ieee80211_is_timing_measurement(rx->skb) || 4021 ieee80211_is_ftm(rx->skb)) { 4022 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 4023 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 4024 } 4025 4026 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 4027 if (rx->sta) 4028 rx->link_sta->rx_stats.packets++; 4029 dev_kfree_skb(rx->skb); 4030 return RX_QUEUED; 4031 } 4032 4033 return RX_CONTINUE; 4034 } 4035 4036 static ieee80211_rx_result debug_noinline 4037 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 4038 { 4039 struct ieee80211_sub_if_data *sdata = rx->sdata; 4040 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4041 int len = rx->skb->len; 4042 4043 if (!ieee80211_is_action(mgmt->frame_control)) 4044 return RX_CONTINUE; 4045 4046 switch (mgmt->u.action.category) { 4047 case WLAN_CATEGORY_SA_QUERY: 4048 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) 4049 break; 4050 4051 switch (mgmt->u.action.action_code) { 4052 case WLAN_ACTION_SA_QUERY_REQUEST: 4053 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4054 break; 4055 ieee80211_process_sa_query_req(sdata, mgmt, len); 4056 goto handled; 4057 } 4058 break; 4059 } 4060 4061 return RX_CONTINUE; 4062 4063 handled: 4064 if (rx->sta) 4065 rx->link_sta->rx_stats.packets++; 4066 dev_kfree_skb(rx->skb); 4067 return RX_QUEUED; 4068 } 4069 4070 static ieee80211_rx_result debug_noinline 4071 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 4072 { 4073 struct ieee80211_local *local = rx->local; 4074 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4075 struct sk_buff *nskb; 4076 struct ieee80211_sub_if_data *sdata = rx->sdata; 4077 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4078 4079 if (!ieee80211_is_action(mgmt->frame_control)) 4080 return RX_CONTINUE; 4081 4082 /* 4083 * For AP mode, hostapd is responsible for handling any action 4084 * frames that we didn't handle, including returning unknown 4085 * ones. For all other modes we will return them to the sender, 4086 * setting the 0x80 bit in the action category, as required by 4087 * 802.11-2012 9.24.4. 4088 * Newer versions of hostapd use the management frame registration 4089 * mechanisms and old cooked monitor interface is no longer supported. 4090 */ 4091 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 4092 (sdata->vif.type == NL80211_IFTYPE_AP || 4093 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 4094 return RX_DROP_U_MALFORMED_ACTION; 4095 4096 if (is_multicast_ether_addr(mgmt->da)) 4097 return RX_DROP_U_UNKNOWN_MCAST_ACTION; 4098 4099 /* do not return rejected action frames */ 4100 if (mgmt->u.action.category & 0x80) 4101 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 4102 4103 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 4104 GFP_ATOMIC); 4105 if (nskb) { 4106 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 4107 4108 nmgmt->u.action.category |= 0x80; 4109 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 4110 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 4111 4112 memset(nskb->cb, 0, sizeof(nskb->cb)); 4113 4114 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 4115 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 4116 4117 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 4118 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 4119 IEEE80211_TX_CTL_NO_CCK_RATE; 4120 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 4121 info->hw_queue = 4122 local->hw.offchannel_tx_hw_queue; 4123 } 4124 4125 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 4126 status->band); 4127 } 4128 4129 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 4130 } 4131 4132 static ieee80211_rx_result debug_noinline 4133 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 4134 { 4135 struct ieee80211_sub_if_data *sdata = rx->sdata; 4136 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4137 4138 if (!ieee80211_is_ext(hdr->frame_control)) 4139 return RX_CONTINUE; 4140 4141 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4142 return RX_DROP_U_UNEXPECTED_EXT_FRAME; 4143 4144 /* for now only beacons are ext, so queue them */ 4145 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4146 4147 return RX_QUEUED; 4148 } 4149 4150 static ieee80211_rx_result debug_noinline 4151 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4152 { 4153 struct ieee80211_sub_if_data *sdata = rx->sdata; 4154 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4155 __le16 stype; 4156 4157 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4158 4159 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4160 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4161 sdata->vif.type != NL80211_IFTYPE_OCB && 4162 sdata->vif.type != NL80211_IFTYPE_STATION) 4163 return RX_DROP_U_UNHANDLED_MGMT; 4164 4165 switch (stype) { 4166 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4167 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4168 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4169 /* process for all: mesh, mlme, ibss */ 4170 break; 4171 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4172 if (is_multicast_ether_addr(mgmt->da) && 4173 !is_broadcast_ether_addr(mgmt->da)) 4174 return RX_DROP_U_MCAST_DEAUTH; 4175 4176 /* process only for station/IBSS */ 4177 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4178 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4179 return RX_DROP_U_UNHANDLED_DEAUTH; 4180 break; 4181 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4182 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4183 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4184 if (is_multicast_ether_addr(mgmt->da) && 4185 !is_broadcast_ether_addr(mgmt->da)) 4186 return RX_DROP_U_MCAST_DISASSOC; 4187 4188 /* process only for station */ 4189 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4190 return RX_DROP_U_UNHANDLED_DISASSOC; 4191 break; 4192 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4193 /* process only for ibss and mesh */ 4194 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4195 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4196 return RX_DROP_U_UNHANDLED_PREQ; 4197 break; 4198 default: 4199 return RX_DROP_U_UNHANDLED_MGMT_STYPE; 4200 } 4201 4202 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4203 4204 return RX_QUEUED; 4205 } 4206 4207 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4208 ieee80211_rx_result res) 4209 { 4210 if (res == RX_QUEUED) { 4211 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4212 return; 4213 } 4214 4215 if (res != RX_CONTINUE) { 4216 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4217 if (rx->sta) 4218 rx->link_sta->rx_stats.dropped++; 4219 } 4220 4221 kfree_skb_reason(rx->skb, (__force u32)res); 4222 } 4223 4224 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4225 struct sk_buff_head *frames) 4226 { 4227 ieee80211_rx_result res; 4228 struct sk_buff *skb; 4229 4230 #define CALL_RXH(rxh) \ 4231 do { \ 4232 res = rxh(rx); \ 4233 if (res != RX_CONTINUE) \ 4234 goto rxh_next; \ 4235 } while (0) 4236 4237 /* Lock here to avoid hitting all of the data used in the RX 4238 * path (e.g. key data, station data, ...) concurrently when 4239 * a frame is released from the reorder buffer due to timeout 4240 * from the timer, potentially concurrently with RX from the 4241 * driver. 4242 */ 4243 spin_lock_bh(&rx->local->rx_path_lock); 4244 4245 while ((skb = __skb_dequeue(frames))) { 4246 /* 4247 * all the other fields are valid across frames 4248 * that belong to an aMPDU since they are on the 4249 * same TID from the same station 4250 */ 4251 rx->skb = skb; 4252 4253 if (WARN_ON_ONCE(!rx->link)) { 4254 res = RX_DROP_U_NO_LINK; 4255 goto rxh_next; 4256 } 4257 4258 CALL_RXH(ieee80211_rx_h_check_more_data); 4259 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4260 CALL_RXH(ieee80211_rx_h_sta_process); 4261 CALL_RXH(ieee80211_rx_h_decrypt); 4262 CALL_RXH(ieee80211_rx_h_defragment); 4263 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4264 /* must be after MMIC verify so header is counted in MPDU mic */ 4265 CALL_RXH(ieee80211_rx_h_amsdu); 4266 CALL_RXH(ieee80211_rx_h_data); 4267 4268 /* special treatment -- needs the queue */ 4269 res = ieee80211_rx_h_ctrl(rx, frames); 4270 if (res != RX_CONTINUE) 4271 goto rxh_next; 4272 4273 CALL_RXH(ieee80211_rx_h_mgmt_check); 4274 CALL_RXH(ieee80211_rx_h_action); 4275 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4276 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4277 CALL_RXH(ieee80211_rx_h_action_return); 4278 CALL_RXH(ieee80211_rx_h_ext); 4279 CALL_RXH(ieee80211_rx_h_mgmt); 4280 4281 rxh_next: 4282 ieee80211_rx_handlers_result(rx, res); 4283 4284 #undef CALL_RXH 4285 } 4286 4287 spin_unlock_bh(&rx->local->rx_path_lock); 4288 } 4289 4290 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4291 { 4292 struct sk_buff_head reorder_release; 4293 ieee80211_rx_result res; 4294 4295 __skb_queue_head_init(&reorder_release); 4296 4297 #define CALL_RXH(rxh) \ 4298 do { \ 4299 res = rxh(rx); \ 4300 if (res != RX_CONTINUE) \ 4301 goto rxh_next; \ 4302 } while (0) 4303 4304 CALL_RXH(ieee80211_rx_h_check_dup); 4305 CALL_RXH(ieee80211_rx_h_check); 4306 4307 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4308 4309 ieee80211_rx_handlers(rx, &reorder_release); 4310 return; 4311 4312 rxh_next: 4313 ieee80211_rx_handlers_result(rx, res); 4314 4315 #undef CALL_RXH 4316 } 4317 4318 static bool 4319 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4320 { 4321 return !!(sta->valid_links & BIT(link_id)); 4322 } 4323 4324 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4325 u8 link_id) 4326 { 4327 rx->link_id = link_id; 4328 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4329 4330 if (!rx->sta) 4331 return rx->link; 4332 4333 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4334 return false; 4335 4336 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4337 4338 return rx->link && rx->link_sta; 4339 } 4340 4341 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4342 struct sta_info *sta, int link_id) 4343 { 4344 rx->link_id = link_id; 4345 rx->sta = sta; 4346 4347 if (sta) { 4348 rx->local = sta->sdata->local; 4349 if (!rx->sdata) 4350 rx->sdata = sta->sdata; 4351 rx->link_sta = &sta->deflink; 4352 } else { 4353 rx->link_sta = NULL; 4354 } 4355 4356 if (link_id < 0) { 4357 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4358 sta && !sta->sta.valid_links) 4359 rx->link = 4360 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4361 else 4362 rx->link = &rx->sdata->deflink; 4363 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4364 return false; 4365 } 4366 4367 return true; 4368 } 4369 4370 /* 4371 * This function makes calls into the RX path, therefore 4372 * it has to be invoked under RCU read lock. 4373 */ 4374 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4375 { 4376 struct sk_buff_head frames; 4377 struct ieee80211_rx_data rx = { 4378 /* This is OK -- must be QoS data frame */ 4379 .security_idx = tid, 4380 .seqno_idx = tid, 4381 }; 4382 struct tid_ampdu_rx *tid_agg_rx; 4383 int link_id = -1; 4384 4385 /* FIXME: statistics won't be right with this */ 4386 if (sta->sta.valid_links) 4387 link_id = ffs(sta->sta.valid_links) - 1; 4388 4389 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4390 return; 4391 4392 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4393 if (!tid_agg_rx) 4394 return; 4395 4396 __skb_queue_head_init(&frames); 4397 4398 spin_lock(&tid_agg_rx->reorder_lock); 4399 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4400 spin_unlock(&tid_agg_rx->reorder_lock); 4401 4402 if (!skb_queue_empty(&frames)) { 4403 struct ieee80211_event event = { 4404 .type = BA_FRAME_TIMEOUT, 4405 .u.ba.tid = tid, 4406 .u.ba.sta = &sta->sta, 4407 }; 4408 drv_event_callback(rx.local, rx.sdata, &event); 4409 } 4410 4411 ieee80211_rx_handlers(&rx, &frames); 4412 } 4413 4414 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4415 u16 ssn, u64 filtered, 4416 u16 received_mpdus) 4417 { 4418 struct ieee80211_local *local; 4419 struct sta_info *sta; 4420 struct tid_ampdu_rx *tid_agg_rx; 4421 struct sk_buff_head frames; 4422 struct ieee80211_rx_data rx = { 4423 /* This is OK -- must be QoS data frame */ 4424 .security_idx = tid, 4425 .seqno_idx = tid, 4426 }; 4427 int i, diff; 4428 4429 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4430 return; 4431 4432 __skb_queue_head_init(&frames); 4433 4434 sta = container_of(pubsta, struct sta_info, sta); 4435 4436 local = sta->sdata->local; 4437 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4438 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4439 local->hw.max_rx_aggregation_subframes); 4440 4441 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4442 return; 4443 4444 rcu_read_lock(); 4445 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4446 if (!tid_agg_rx) 4447 goto out; 4448 4449 spin_lock_bh(&tid_agg_rx->reorder_lock); 4450 4451 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4452 int release; 4453 4454 /* release all frames in the reorder buffer */ 4455 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4456 IEEE80211_SN_MODULO; 4457 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4458 release, &frames); 4459 /* update ssn to match received ssn */ 4460 tid_agg_rx->head_seq_num = ssn; 4461 } else { 4462 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4463 &frames); 4464 } 4465 4466 /* handle the case that received ssn is behind the mac ssn. 4467 * it can be tid_agg_rx->buf_size behind and still be valid */ 4468 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4469 if (diff >= tid_agg_rx->buf_size) { 4470 tid_agg_rx->reorder_buf_filtered = 0; 4471 goto release; 4472 } 4473 filtered = filtered >> diff; 4474 ssn += diff; 4475 4476 /* update bitmap */ 4477 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4478 int index = (ssn + i) % tid_agg_rx->buf_size; 4479 4480 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4481 if (filtered & BIT_ULL(i)) 4482 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4483 } 4484 4485 /* now process also frames that the filter marking released */ 4486 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4487 4488 release: 4489 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4490 4491 ieee80211_rx_handlers(&rx, &frames); 4492 4493 out: 4494 rcu_read_unlock(); 4495 } 4496 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4497 4498 /* main receive path */ 4499 4500 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4501 { 4502 return ether_addr_equal(raddr, addr) || 4503 is_broadcast_ether_addr(raddr); 4504 } 4505 4506 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4507 { 4508 struct ieee80211_sub_if_data *sdata = rx->sdata; 4509 struct sk_buff *skb = rx->skb; 4510 struct ieee80211_hdr *hdr = (void *)skb->data; 4511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4512 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4513 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4514 ieee80211_is_s1g_beacon(hdr->frame_control); 4515 static const u8 nan_network_id[ETH_ALEN] __aligned(2) = { 4516 0x51, 0x6F, 0x9A, 0x01, 0x00, 0x00 4517 }; 4518 4519 switch (sdata->vif.type) { 4520 case NL80211_IFTYPE_STATION: 4521 if (!bssid && !sdata->u.mgd.use_4addr) 4522 return false; 4523 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4524 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4525 return false; 4526 if (multicast) 4527 return true; 4528 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4529 case NL80211_IFTYPE_ADHOC: 4530 if (!bssid) 4531 return false; 4532 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4533 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4534 !is_valid_ether_addr(hdr->addr2)) 4535 return false; 4536 if (ieee80211_is_beacon(hdr->frame_control)) 4537 return true; 4538 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4539 return false; 4540 if (!multicast && 4541 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4542 return false; 4543 if (!rx->sta) { 4544 int rate_idx; 4545 if (status->encoding != RX_ENC_LEGACY) 4546 rate_idx = 0; /* TODO: HT/VHT rates */ 4547 else 4548 rate_idx = status->rate_idx; 4549 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4550 BIT(rate_idx)); 4551 } 4552 return true; 4553 case NL80211_IFTYPE_OCB: 4554 if (!bssid) 4555 return false; 4556 if (!ieee80211_is_data_present(hdr->frame_control)) 4557 return false; 4558 if (!is_broadcast_ether_addr(bssid)) 4559 return false; 4560 if (!multicast && 4561 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4562 return false; 4563 /* reject invalid/our STA address */ 4564 if (!is_valid_ether_addr(hdr->addr2) || 4565 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4566 return false; 4567 if (!rx->sta) { 4568 int rate_idx; 4569 if (status->encoding != RX_ENC_LEGACY) 4570 rate_idx = 0; /* TODO: HT rates */ 4571 else 4572 rate_idx = status->rate_idx; 4573 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4574 BIT(rate_idx)); 4575 } 4576 return true; 4577 case NL80211_IFTYPE_MESH_POINT: 4578 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4579 return false; 4580 if (multicast) 4581 return true; 4582 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4583 case NL80211_IFTYPE_AP_VLAN: 4584 case NL80211_IFTYPE_AP: 4585 if (!bssid) 4586 return ieee80211_is_our_addr(sdata, hdr->addr1, 4587 &rx->link_id); 4588 4589 if (!is_broadcast_ether_addr(bssid) && 4590 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4591 /* 4592 * Accept public action frames even when the 4593 * BSSID doesn't match, this is used for P2P 4594 * and location updates. Note that mac80211 4595 * itself never looks at these frames. 4596 */ 4597 if (!multicast && 4598 !ieee80211_is_our_addr(sdata, hdr->addr1, 4599 &rx->link_id)) 4600 return false; 4601 if (ieee80211_is_public_action(hdr, skb->len)) 4602 return true; 4603 return ieee80211_is_beacon(hdr->frame_control); 4604 } 4605 4606 if (!ieee80211_has_tods(hdr->frame_control)) { 4607 /* ignore data frames to TDLS-peers */ 4608 if (ieee80211_is_data(hdr->frame_control)) 4609 return false; 4610 /* ignore action frames to TDLS-peers */ 4611 if (ieee80211_is_action(hdr->frame_control) && 4612 !is_broadcast_ether_addr(bssid) && 4613 !ether_addr_equal(bssid, hdr->addr1)) 4614 return false; 4615 } 4616 4617 /* 4618 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4619 * the BSSID - we've checked that already but may have accepted 4620 * the wildcard (ff:ff:ff:ff:ff:ff). 4621 * 4622 * It also says: 4623 * The BSSID of the Data frame is determined as follows: 4624 * a) If the STA is contained within an AP or is associated 4625 * with an AP, the BSSID is the address currently in use 4626 * by the STA contained in the AP. 4627 * 4628 * So we should not accept data frames with an address that's 4629 * multicast. 4630 * 4631 * Accepting it also opens a security problem because stations 4632 * could encrypt it with the GTK and inject traffic that way. 4633 */ 4634 if (ieee80211_is_data(hdr->frame_control) && multicast) 4635 return false; 4636 4637 return true; 4638 case NL80211_IFTYPE_P2P_DEVICE: 4639 return ieee80211_is_public_action(hdr, skb->len) || 4640 ieee80211_is_probe_req(hdr->frame_control) || 4641 ieee80211_is_probe_resp(hdr->frame_control) || 4642 ieee80211_is_beacon(hdr->frame_control) || 4643 (ieee80211_is_auth(hdr->frame_control) && 4644 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4645 case NL80211_IFTYPE_NAN: 4646 if (ieee80211_has_tods(hdr->frame_control) || 4647 ieee80211_has_fromds(hdr->frame_control)) 4648 return false; 4649 4650 /* 4651 * Accept only frames that are addressed to the NAN cluster 4652 * (based on the Cluster ID). From these frames, accept only 4653 * - public action frames, 4654 * - authentication frames to the local address, and 4655 * - robust management frames except disassoc. 4656 */ 4657 if (!ether_addr_equal(sdata->u.nan.conf.cluster_id, hdr->addr3)) 4658 return false; 4659 if (ieee80211_is_public_action(hdr, skb->len)) 4660 return true; 4661 if (ieee80211_is_auth(hdr->frame_control) && 4662 ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4663 return true; 4664 if (!ieee80211_is_disassoc(hdr->frame_control) && 4665 ieee80211_is_robust_mgmt_frame(skb)) 4666 return true; 4667 return false; 4668 case NL80211_IFTYPE_NAN_DATA: 4669 if (ieee80211_has_tods(hdr->frame_control) || 4670 ieee80211_has_fromds(hdr->frame_control)) 4671 return false; 4672 4673 if (ieee80211_is_data(hdr->frame_control)) { 4674 struct ieee80211_sub_if_data *nmi; 4675 4676 nmi = rcu_dereference(sdata->u.nan_data.nmi); 4677 if (!nmi) 4678 return false; 4679 4680 if (!ether_addr_equal(nmi->u.nan.conf.cluster_id, 4681 hdr->addr3)) 4682 return false; 4683 4684 return multicast || 4685 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4686 } 4687 4688 /* Non-public action frames (unicast or multicast) */ 4689 if (ieee80211_is_action(hdr->frame_control) && 4690 !ieee80211_is_public_action(hdr, skb->len) && 4691 (ether_addr_equal(nan_network_id, hdr->addr1) || 4692 ether_addr_equal(sdata->vif.addr, hdr->addr1))) 4693 return true; 4694 4695 /* Unicast secure management frames */ 4696 return ether_addr_equal(sdata->vif.addr, hdr->addr1) && 4697 ieee80211_is_unicast_robust_mgmt_frame(skb); 4698 case NL80211_IFTYPE_PD: 4699 /* 4700 * Accept only authentication frames (PASN) addressed to 4701 * this interface. 4702 */ 4703 return ieee80211_is_auth(hdr->frame_control) && 4704 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4705 default: 4706 break; 4707 } 4708 4709 WARN_ON_ONCE(1); 4710 return false; 4711 } 4712 4713 void ieee80211_check_fast_rx(struct sta_info *sta) 4714 { 4715 struct ieee80211_sub_if_data *sdata = sta->sdata; 4716 struct ieee80211_local *local = sdata->local; 4717 struct ieee80211_key *key; 4718 struct ieee80211_fast_rx fastrx = { 4719 .dev = sdata->dev, 4720 .vif_type = sdata->vif.type, 4721 .control_port_protocol = sdata->control_port_protocol, 4722 }, *old, *new = NULL; 4723 u32 offload_flags; 4724 bool set_offload = false; 4725 bool assign = false; 4726 bool offload; 4727 4728 /* use sparse to check that we don't return without updating */ 4729 __acquire(check_fast_rx); 4730 4731 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4732 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4733 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4734 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4735 4736 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4737 4738 /* fast-rx doesn't do reordering */ 4739 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4740 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4741 goto clear; 4742 4743 switch (sdata->vif.type) { 4744 case NL80211_IFTYPE_STATION: 4745 if (sta->sta.tdls) { 4746 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4747 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4748 fastrx.expected_ds_bits = 0; 4749 } else { 4750 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4751 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4752 fastrx.expected_ds_bits = 4753 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4754 } 4755 4756 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4757 fastrx.expected_ds_bits |= 4758 cpu_to_le16(IEEE80211_FCTL_TODS); 4759 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4760 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4761 } 4762 4763 if (!sdata->u.mgd.powersave) 4764 break; 4765 4766 /* software powersave is a huge mess, avoid all of it */ 4767 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4768 goto clear; 4769 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4770 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4771 goto clear; 4772 break; 4773 case NL80211_IFTYPE_AP_VLAN: 4774 case NL80211_IFTYPE_AP: 4775 /* parallel-rx requires this, at least with calls to 4776 * ieee80211_sta_ps_transition() 4777 */ 4778 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4779 goto clear; 4780 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4781 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4782 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4783 4784 fastrx.internal_forward = 4785 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4786 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4787 !sdata->u.vlan.sta); 4788 4789 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4790 sdata->u.vlan.sta) { 4791 fastrx.expected_ds_bits |= 4792 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4793 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4794 fastrx.internal_forward = 0; 4795 } 4796 4797 break; 4798 case NL80211_IFTYPE_MESH_POINT: 4799 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4800 IEEE80211_FCTL_TODS); 4801 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4802 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4803 break; 4804 default: 4805 goto clear; 4806 } 4807 4808 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4809 goto clear; 4810 4811 rcu_read_lock(); 4812 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4813 if (!key) 4814 key = rcu_dereference(sdata->default_unicast_key); 4815 if (key) { 4816 switch (key->conf.cipher) { 4817 case WLAN_CIPHER_SUITE_TKIP: 4818 /* we don't want to deal with MMIC in fast-rx */ 4819 goto clear_rcu; 4820 case WLAN_CIPHER_SUITE_CCMP: 4821 case WLAN_CIPHER_SUITE_CCMP_256: 4822 case WLAN_CIPHER_SUITE_GCMP: 4823 case WLAN_CIPHER_SUITE_GCMP_256: 4824 break; 4825 default: 4826 /* We also don't want to deal with 4827 * WEP or cipher scheme. 4828 */ 4829 goto clear_rcu; 4830 } 4831 4832 fastrx.key = true; 4833 fastrx.icv_len = key->conf.icv_len; 4834 } 4835 4836 assign = true; 4837 clear_rcu: 4838 rcu_read_unlock(); 4839 clear: 4840 __release(check_fast_rx); 4841 4842 if (assign) 4843 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4844 4845 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4846 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4847 4848 if (assign && offload) 4849 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4850 else 4851 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4852 4853 if (set_offload) 4854 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4855 4856 spin_lock_bh(&sta->lock); 4857 old = rcu_dereference_protected(sta->fast_rx, true); 4858 rcu_assign_pointer(sta->fast_rx, new); 4859 spin_unlock_bh(&sta->lock); 4860 4861 if (old) 4862 kfree_rcu(old, rcu_head); 4863 } 4864 4865 void ieee80211_clear_fast_rx(struct sta_info *sta) 4866 { 4867 struct ieee80211_fast_rx *old; 4868 4869 spin_lock_bh(&sta->lock); 4870 old = rcu_dereference_protected(sta->fast_rx, true); 4871 RCU_INIT_POINTER(sta->fast_rx, NULL); 4872 spin_unlock_bh(&sta->lock); 4873 4874 if (old) 4875 kfree_rcu(old, rcu_head); 4876 } 4877 4878 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4879 { 4880 struct ieee80211_local *local = sdata->local; 4881 struct sta_info *sta; 4882 4883 lockdep_assert_wiphy(local->hw.wiphy); 4884 4885 list_for_each_entry(sta, &local->sta_list, list) { 4886 if (sdata != sta->sdata && 4887 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4888 continue; 4889 ieee80211_check_fast_rx(sta); 4890 } 4891 } 4892 4893 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4894 { 4895 struct ieee80211_local *local = sdata->local; 4896 4897 lockdep_assert_wiphy(local->hw.wiphy); 4898 4899 __ieee80211_check_fast_rx_iface(sdata); 4900 } 4901 4902 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4903 struct ieee80211_fast_rx *fast_rx, 4904 int orig_len) 4905 { 4906 struct ieee80211_sta_rx_stats *stats; 4907 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4908 struct sta_info *sta = rx->sta; 4909 struct link_sta_info *link_sta; 4910 struct sk_buff *skb = rx->skb; 4911 void *sa = skb->data + ETH_ALEN; 4912 void *da = skb->data; 4913 4914 if (rx->link_id >= 0) { 4915 link_sta = rcu_dereference(sta->link[rx->link_id]); 4916 if (WARN_ON_ONCE(!link_sta)) { 4917 dev_kfree_skb(rx->skb); 4918 return; 4919 } 4920 } else { 4921 link_sta = &sta->deflink; 4922 } 4923 4924 stats = &link_sta->rx_stats; 4925 if (fast_rx->uses_rss) 4926 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4927 4928 /* statistics part of ieee80211_rx_h_sta_process() */ 4929 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4930 stats->last_signal = status->signal; 4931 if (!fast_rx->uses_rss) 4932 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4933 -status->signal); 4934 } 4935 4936 if (status->chains) { 4937 int i; 4938 4939 stats->chains = status->chains; 4940 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4941 int signal = status->chain_signal[i]; 4942 4943 if (!(status->chains & BIT(i))) 4944 continue; 4945 4946 stats->chain_signal_last[i] = signal; 4947 if (!fast_rx->uses_rss) 4948 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4949 -signal); 4950 } 4951 } 4952 /* end of statistics */ 4953 4954 stats->last_rx = jiffies; 4955 stats->last_rate = sta_stats_encode_rate(status); 4956 4957 stats->fragments++; 4958 stats->packets++; 4959 4960 skb->dev = fast_rx->dev; 4961 4962 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4963 4964 /* The seqno index has the same property as needed 4965 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4966 * for non-QoS-data frames. Here we know it's a data 4967 * frame, so count MSDUs. 4968 */ 4969 u64_stats_update_begin(&stats->syncp); 4970 u64_stats_inc(&stats->msdu[rx->seqno_idx]); 4971 u64_stats_add(&stats->bytes, orig_len); 4972 u64_stats_update_end(&stats->syncp); 4973 4974 if (fast_rx->internal_forward) { 4975 struct sk_buff *xmit_skb = NULL; 4976 if (is_multicast_ether_addr(da)) { 4977 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4978 } else if (!ether_addr_equal(da, sa) && 4979 sta_info_get(rx->sdata, da)) { 4980 xmit_skb = skb; 4981 skb = NULL; 4982 } 4983 4984 if (xmit_skb) { 4985 /* 4986 * Send to wireless media and increase priority by 256 4987 * to keep the received priority instead of 4988 * reclassifying the frame (see cfg80211_classify8021d). 4989 */ 4990 xmit_skb->priority += 256; 4991 xmit_skb->protocol = htons(ETH_P_802_3); 4992 skb_reset_network_header(xmit_skb); 4993 skb_reset_mac_header(xmit_skb); 4994 dev_queue_xmit(xmit_skb); 4995 } 4996 4997 if (!skb) 4998 return; 4999 } 5000 5001 /* deliver to local stack */ 5002 skb->protocol = eth_type_trans(skb, fast_rx->dev); 5003 ieee80211_deliver_skb_to_local_stack(skb, rx); 5004 } 5005 5006 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 5007 struct ieee80211_fast_rx *fast_rx) 5008 { 5009 struct sk_buff *skb = rx->skb; 5010 struct ieee80211_hdr *hdr = (void *)skb->data; 5011 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5012 ieee80211_rx_result res; 5013 int orig_len = skb->len; 5014 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 5015 int snap_offs = hdrlen; 5016 struct { 5017 u8 snap[sizeof(rfc1042_header)]; 5018 __be16 proto; 5019 } *payload __aligned(2); 5020 struct { 5021 u8 da[ETH_ALEN]; 5022 u8 sa[ETH_ALEN]; 5023 } addrs __aligned(2); 5024 struct ieee80211_sta_rx_stats *stats; 5025 u32 encoded_rate; 5026 5027 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 5028 * to a common data structure; drivers can implement that per queue 5029 * but we don't have that information in mac80211 5030 */ 5031 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 5032 return false; 5033 5034 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 5035 5036 /* If using encryption, we also need to have: 5037 * - PN_VALIDATED: similar, but the implementation is tricky 5038 * - DECRYPTED: necessary for PN_VALIDATED 5039 */ 5040 if (fast_rx->key && 5041 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 5042 return false; 5043 5044 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 5045 return false; 5046 5047 if (unlikely(ieee80211_is_frag(hdr))) 5048 return false; 5049 5050 /* Since our interface address cannot be multicast, this 5051 * implicitly also rejects multicast frames without the 5052 * explicit check. 5053 * 5054 * We shouldn't get any *data* frames not addressed to us 5055 * (AP mode will accept multicast *management* frames), but 5056 * punting here will make it go through the full checks in 5057 * ieee80211_accept_frame(). 5058 */ 5059 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 5060 return false; 5061 5062 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 5063 IEEE80211_FCTL_TODS)) != 5064 fast_rx->expected_ds_bits) 5065 return false; 5066 5067 /* assign the key to drop unencrypted frames (later) 5068 * and strip the IV/MIC if necessary 5069 */ 5070 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 5071 /* GCMP header length is the same */ 5072 snap_offs += IEEE80211_CCMP_HDR_LEN; 5073 } 5074 5075 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 5076 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 5077 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 5078 return false; 5079 5080 payload = (void *)(skb->data + snap_offs); 5081 5082 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 5083 return false; 5084 5085 /* Don't handle these here since they require special code. 5086 * Accept AARP and IPX even though they should come with a 5087 * bridge-tunnel header - but if we get them this way then 5088 * there's little point in discarding them. 5089 */ 5090 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 5091 payload->proto == fast_rx->control_port_protocol)) 5092 return false; 5093 } 5094 5095 /* after this point, don't punt to the slowpath! */ 5096 5097 if (fast_rx->uses_rss) 5098 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 5099 else 5100 stats = &rx->link_sta->rx_stats; 5101 5102 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 5103 pskb_trim(skb, skb->len - fast_rx->icv_len)) 5104 goto drop; 5105 5106 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 5107 goto drop; 5108 5109 if (status->rx_flags & IEEE80211_RX_AMSDU) { 5110 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 5111 RX_QUEUED) 5112 goto drop; 5113 5114 return true; 5115 } 5116 5117 /* do the header conversion - first grab the addresses */ 5118 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 5119 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 5120 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 5121 skb_pull(skb, snap_offs - 2); 5122 put_unaligned_be16(skb->len - 2, skb->data); 5123 } else { 5124 skb_postpull_rcsum(skb, skb->data + snap_offs, 5125 sizeof(rfc1042_header) + 2); 5126 5127 /* remove the SNAP but leave the ethertype */ 5128 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 5129 } 5130 /* push the addresses in front */ 5131 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 5132 5133 /* capture before mesh forward may memset or free skb->cb */ 5134 encoded_rate = sta_stats_encode_rate(status); 5135 5136 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 5137 switch (res) { 5138 case RX_QUEUED: 5139 stats->last_rx = jiffies; 5140 stats->last_rate = encoded_rate; 5141 return true; 5142 case RX_CONTINUE: 5143 break; 5144 default: 5145 goto drop; 5146 } 5147 5148 ieee80211_rx_8023(rx, fast_rx, orig_len); 5149 5150 return true; 5151 drop: 5152 dev_kfree_skb(skb); 5153 5154 stats->dropped++; 5155 return true; 5156 } 5157 5158 /* 5159 * This function returns whether or not the SKB 5160 * was destined for RX processing or not, which, 5161 * if consume is true, is equivalent to whether 5162 * or not the skb was consumed. 5163 */ 5164 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 5165 struct sk_buff *skb, bool consume) 5166 { 5167 struct ieee80211_local *local = rx->local; 5168 struct ieee80211_sub_if_data *sdata = rx->sdata; 5169 struct ieee80211_hdr *hdr = (void *)skb->data; 5170 struct link_sta_info *link_sta = rx->link_sta; 5171 struct ieee80211_link_data *link = rx->link; 5172 5173 rx->skb = skb; 5174 5175 /* See if we can do fast-rx; if we have to copy we already lost, 5176 * so punt in that case. We should never have to deliver a data 5177 * frame to multiple interfaces anyway. 5178 * 5179 * We skip the ieee80211_accept_frame() call and do the necessary 5180 * checking inside ieee80211_invoke_fast_rx(). 5181 */ 5182 if (consume && rx->sta) { 5183 struct ieee80211_fast_rx *fast_rx; 5184 5185 fast_rx = rcu_dereference(rx->sta->fast_rx); 5186 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5187 return true; 5188 } 5189 5190 if (!ieee80211_accept_frame(rx)) 5191 return false; 5192 5193 if (!consume) { 5194 struct skb_shared_hwtstamps *shwt; 5195 5196 rx->skb = skb_copy(skb, GFP_ATOMIC); 5197 if (!rx->skb) { 5198 if (net_ratelimit()) 5199 wiphy_debug(local->hw.wiphy, 5200 "failed to copy skb for %s\n", 5201 sdata->name); 5202 return true; 5203 } 5204 5205 /* skb_copy() does not copy the hw timestamps, so copy it 5206 * explicitly 5207 */ 5208 shwt = skb_hwtstamps(rx->skb); 5209 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5210 5211 /* Update the hdr pointer to the new skb for translation below */ 5212 hdr = (struct ieee80211_hdr *)rx->skb->data; 5213 } 5214 5215 /* Store a copy of the pre-translated link addresses for SW crypto */ 5216 if (unlikely(is_unicast_ether_addr(hdr->addr1) && 5217 !ieee80211_is_data(hdr->frame_control))) 5218 memcpy(rx->link_addrs, &hdr->addrs, 3 * ETH_ALEN); 5219 5220 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5221 is_unicast_ether_addr(hdr->addr1) && 5222 !ieee80211_is_probe_resp(hdr->frame_control) && 5223 !ieee80211_is_beacon(hdr->frame_control)) { 5224 /* translate to MLD addresses */ 5225 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5226 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5227 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5228 ether_addr_copy(hdr->addr2, rx->sta->addr); 5229 /* translate A3 only if it's the BSSID */ 5230 if (!ieee80211_has_tods(hdr->frame_control) && 5231 !ieee80211_has_fromds(hdr->frame_control)) { 5232 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5233 ether_addr_copy(hdr->addr3, rx->sta->addr); 5234 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5235 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5236 } 5237 /* not needed for A4 since it can only carry the SA */ 5238 } 5239 5240 ieee80211_invoke_rx_handlers(rx); 5241 return true; 5242 } 5243 5244 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5245 struct ieee80211_sta *pubsta, 5246 struct sk_buff *skb, 5247 struct list_head *list) 5248 { 5249 struct ieee80211_local *local = hw_to_local(hw); 5250 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5251 struct ieee80211_fast_rx *fast_rx; 5252 struct ieee80211_rx_data rx; 5253 struct sta_info *sta; 5254 int link_id = -1; 5255 5256 memset(&rx, 0, sizeof(rx)); 5257 rx.skb = skb; 5258 rx.local = local; 5259 rx.list = list; 5260 rx.link_id = -1; 5261 5262 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5263 5264 /* drop frame if too short for header */ 5265 if (skb->len < sizeof(struct ethhdr)) 5266 goto drop; 5267 5268 if (!pubsta) 5269 goto drop; 5270 5271 if (status->link_valid) 5272 link_id = status->link_id; 5273 5274 /* 5275 * TODO: Should the frame be dropped if the right link_id is not 5276 * available? Or may be it is fine in the current form to proceed with 5277 * the frame processing because with frame being in 802.3 format, 5278 * link_id is used only for stats purpose and updating the stats on 5279 * the deflink is fine? 5280 */ 5281 sta = container_of(pubsta, struct sta_info, sta); 5282 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5283 goto drop; 5284 5285 fast_rx = rcu_dereference(rx.sta->fast_rx); 5286 if (!fast_rx) 5287 goto drop; 5288 5289 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5290 return; 5291 5292 drop: 5293 dev_kfree_skb(skb); 5294 } 5295 5296 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5297 struct sk_buff *skb, bool consume) 5298 { 5299 struct link_sta_info *link_sta; 5300 struct ieee80211_hdr *hdr = (void *)skb->data; 5301 struct sta_info *sta; 5302 int link_id = -1; 5303 5304 /* 5305 * Look up link station first, in case there's a 5306 * chance that they might have a link address that 5307 * is identical to the MLD address, that way we'll 5308 * have the link information if needed. 5309 */ 5310 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5311 if (link_sta) { 5312 sta = link_sta->sta; 5313 link_id = link_sta->link_id; 5314 } else { 5315 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5316 5317 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5318 if (status->link_valid) { 5319 link_id = status->link_id; 5320 } else if (ieee80211_vif_is_mld(&rx->sdata->vif) && 5321 status->freq) { 5322 struct ieee80211_link_data *link; 5323 struct ieee80211_chanctx_conf *conf; 5324 5325 for_each_link_data_rcu(rx->sdata, link) { 5326 conf = rcu_dereference(link->conf->chanctx_conf); 5327 if (!conf || !conf->def.chan) 5328 continue; 5329 5330 if (status->freq == conf->def.chan->center_freq) { 5331 link_id = link->link_id; 5332 break; 5333 } 5334 } 5335 } 5336 } 5337 5338 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5339 return false; 5340 5341 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5342 } 5343 5344 /* 5345 * This is the actual Rx frames handler. as it belongs to Rx path it must 5346 * be called with rcu_read_lock protection. 5347 */ 5348 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5349 struct ieee80211_sta *pubsta, 5350 struct sk_buff *skb, 5351 struct list_head *list) 5352 { 5353 struct ieee80211_local *local = hw_to_local(hw); 5354 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5355 struct ieee80211_sub_if_data *sdata; 5356 struct ieee80211_hdr *hdr; 5357 __le16 fc; 5358 struct ieee80211_rx_data rx; 5359 struct ieee80211_sub_if_data *prev; 5360 struct rhlist_head *tmp; 5361 int err = 0; 5362 5363 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5364 memset(&rx, 0, sizeof(rx)); 5365 rx.skb = skb; 5366 rx.local = local; 5367 rx.list = list; 5368 rx.link_id = -1; 5369 5370 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5371 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5372 5373 if (ieee80211_is_mgmt(fc)) { 5374 /* drop frame if too short for header */ 5375 if (skb->len < ieee80211_hdrlen(fc)) 5376 err = -ENOBUFS; 5377 else 5378 err = skb_linearize(skb); 5379 } else { 5380 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5381 } 5382 5383 if (err) { 5384 dev_kfree_skb(skb); 5385 return; 5386 } 5387 5388 hdr = (struct ieee80211_hdr *)skb->data; 5389 ieee80211_parse_qos(&rx); 5390 ieee80211_verify_alignment(&rx); 5391 5392 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5393 ieee80211_is_beacon(hdr->frame_control) || 5394 ieee80211_is_s1g_beacon(hdr->frame_control))) 5395 ieee80211_scan_rx(local, skb); 5396 5397 if (ieee80211_is_data(fc)) { 5398 struct sta_info *sta, *prev_sta; 5399 int link_id = -1; 5400 5401 if (status->link_valid) 5402 link_id = status->link_id; 5403 5404 if (pubsta) { 5405 sta = container_of(pubsta, struct sta_info, sta); 5406 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5407 goto out; 5408 5409 /* 5410 * In MLO connection, fetch the link_id using addr2 5411 * when the driver does not pass link_id in status. 5412 * When the address translation is already performed by 5413 * driver/hw, the valid link_id must be passed in 5414 * status. 5415 */ 5416 5417 if (!status->link_valid && pubsta->mlo) { 5418 struct link_sta_info *link_sta; 5419 5420 link_sta = link_sta_info_get_bss(rx.sdata, 5421 hdr->addr2); 5422 if (!link_sta) 5423 goto out; 5424 5425 if (!ieee80211_rx_data_set_link(&rx, 5426 link_sta->link_id)) 5427 goto out; 5428 } 5429 5430 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5431 return; 5432 goto out; 5433 } 5434 5435 prev_sta = NULL; 5436 5437 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5438 if (!prev_sta) { 5439 prev_sta = sta; 5440 continue; 5441 } 5442 5443 rx.sdata = prev_sta->sdata; 5444 if (!status->link_valid && prev_sta->sta.mlo) { 5445 struct link_sta_info *link_sta; 5446 5447 link_sta = link_sta_info_get_bss(rx.sdata, 5448 hdr->addr2); 5449 if (!link_sta) 5450 continue; 5451 5452 link_id = link_sta->link_id; 5453 } 5454 5455 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5456 goto out; 5457 5458 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5459 5460 prev_sta = sta; 5461 } 5462 5463 if (prev_sta) { 5464 rx.sdata = prev_sta->sdata; 5465 if (!status->link_valid && prev_sta->sta.mlo) { 5466 struct link_sta_info *link_sta; 5467 5468 link_sta = link_sta_info_get_bss(rx.sdata, 5469 hdr->addr2); 5470 if (!link_sta) 5471 goto out; 5472 5473 link_id = link_sta->link_id; 5474 } 5475 5476 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5477 goto out; 5478 5479 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5480 return; 5481 goto out; 5482 } 5483 } 5484 5485 prev = NULL; 5486 5487 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5488 if (!ieee80211_sdata_running(sdata)) 5489 continue; 5490 5491 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5492 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5493 continue; 5494 5495 /* 5496 * frame is destined for this interface, but if it's 5497 * not also for the previous one we handle that after 5498 * the loop to avoid copying the SKB once too much 5499 */ 5500 5501 if (!prev) { 5502 prev = sdata; 5503 continue; 5504 } 5505 5506 rx.sdata = prev; 5507 ieee80211_rx_for_interface(&rx, skb, false); 5508 5509 prev = sdata; 5510 } 5511 5512 if (prev) { 5513 rx.sdata = prev; 5514 5515 if (ieee80211_rx_for_interface(&rx, skb, true)) 5516 return; 5517 } 5518 5519 out: 5520 dev_kfree_skb(skb); 5521 } 5522 5523 /* 5524 * This is the receive path handler. It is called by a low level driver when an 5525 * 802.11 MPDU is received from the hardware. 5526 */ 5527 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5528 struct sk_buff *skb, struct list_head *list) 5529 { 5530 struct ieee80211_local *local = hw_to_local(hw); 5531 struct ieee80211_rate *rate = NULL; 5532 struct ieee80211_supported_band *sband; 5533 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5534 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5535 5536 WARN_ON_ONCE(softirq_count() == 0); 5537 5538 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5539 goto drop; 5540 5541 sband = local->hw.wiphy->bands[status->band]; 5542 if (WARN_ON(!sband)) 5543 goto drop; 5544 5545 /* 5546 * If we're suspending, it is possible although not too likely 5547 * that we'd be receiving frames after having already partially 5548 * quiesced the stack. We can't process such frames then since 5549 * that might, for example, cause stations to be added or other 5550 * driver callbacks be invoked. 5551 */ 5552 if (unlikely(local->quiescing || local->suspended)) 5553 goto drop; 5554 5555 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5556 if (unlikely(local->in_reconfig)) 5557 goto drop; 5558 5559 /* 5560 * The same happens when we're not even started, 5561 * but that's worth a warning. 5562 */ 5563 if (WARN_ON(!local->started)) 5564 goto drop; 5565 5566 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC) && 5567 !(status->flag & RX_FLAG_NO_PSDU && 5568 status->zero_length_psdu_type == 5569 IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED))) { 5570 /* 5571 * Validate the rate, unless there was a PLCP error which may 5572 * have an invalid rate or the PSDU was not capture and may be 5573 * missing rate information. 5574 */ 5575 5576 switch (status->encoding) { 5577 case RX_ENC_HT: 5578 /* 5579 * rate_idx is MCS index, which can be [0-76] 5580 * as documented on: 5581 * 5582 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5583 * 5584 * Anything else would be some sort of driver or 5585 * hardware error. The driver should catch hardware 5586 * errors. 5587 */ 5588 if (WARN(status->rate_idx > 76, 5589 "Rate marked as an HT rate but passed " 5590 "status->rate_idx is not " 5591 "an MCS index [0-76]: %d (0x%02x)\n", 5592 status->rate_idx, 5593 status->rate_idx)) 5594 goto drop; 5595 break; 5596 case RX_ENC_VHT: 5597 if (WARN_ONCE(status->rate_idx > 11 || 5598 !status->nss || 5599 status->nss > 8, 5600 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5601 status->rate_idx, status->nss)) 5602 goto drop; 5603 break; 5604 case RX_ENC_HE: 5605 if (WARN_ONCE(status->rate_idx > 11 || 5606 !status->nss || 5607 status->nss > 8, 5608 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5609 status->rate_idx, status->nss)) 5610 goto drop; 5611 break; 5612 case RX_ENC_EHT: 5613 if (WARN_ONCE(status->rate_idx > 15 || 5614 !status->nss || 5615 status->nss > 8 || 5616 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5617 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5618 status->rate_idx, status->nss, status->eht.gi)) 5619 goto drop; 5620 break; 5621 case RX_ENC_UHR: 5622 if (WARN_ONCE(!(status->rate_idx <= 15 || 5623 status->rate_idx == 17 || 5624 status->rate_idx == 19 || 5625 status->rate_idx == 20 || 5626 status->rate_idx == 23) || 5627 !status->nss || 5628 status->nss > 8 || 5629 status->uhr.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5630 "Rate marked as a UHR rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5631 status->rate_idx, status->nss, status->uhr.gi)) 5632 goto drop; 5633 if (WARN_ONCE(status->uhr.elr && 5634 (status->nss != 1 || status->rate_idx > 1 || 5635 status->uhr.gi != NL80211_RATE_INFO_EHT_GI_1_6 || 5636 status->bw != RATE_INFO_BW_20 || status->uhr.im), 5637 "bad UHR ELR MCS MCS:%d, NSS:%d, GI:%d, BW:%d, IM:%d\n", 5638 status->rate_idx, status->nss, status->uhr.gi, 5639 status->bw, status->uhr.im)) 5640 goto drop; 5641 if (WARN_ONCE(status->uhr.im && 5642 (status->nss != 1 || status->rate_idx == 15), 5643 "bad UHR IM MCS MCS:%d, NSS:%d\n", 5644 status->rate_idx, status->nss)) 5645 goto drop; 5646 break; 5647 case RX_ENC_S1G: 5648 if (WARN_ONCE(status->rate_idx > 12 || 5649 !status->nss || 5650 status->nss > 4, 5651 "Rate marked as an S1G rate but data is invalid: MCS: %d, NSS: %d\n", 5652 status->rate_idx, status->nss)) 5653 goto drop; 5654 break; 5655 default: 5656 WARN_ON_ONCE(1); 5657 fallthrough; 5658 case RX_ENC_LEGACY: 5659 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5660 goto drop; 5661 rate = &sband->bitrates[status->rate_idx]; 5662 } 5663 } 5664 5665 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5666 goto drop; 5667 5668 status->rx_flags = 0; 5669 5670 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5671 5672 /* 5673 * Frames with failed FCS/PLCP checksum are not returned, 5674 * all other frames are returned without radiotap header 5675 * if it was previously present. 5676 * Also, frames with less than 16 bytes are dropped. 5677 */ 5678 if (!(status->flag & RX_FLAG_8023)) 5679 skb = ieee80211_rx_monitor(local, skb, rate); 5680 if (skb) { 5681 if ((status->flag & RX_FLAG_8023) || 5682 ieee80211_is_data_present(hdr->frame_control)) 5683 ieee80211_tpt_led_trig_rx(local, skb->len); 5684 5685 if (status->flag & RX_FLAG_8023) 5686 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5687 else 5688 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5689 } 5690 5691 kcov_remote_stop(); 5692 return; 5693 drop: 5694 kfree_skb(skb); 5695 } 5696 EXPORT_SYMBOL(ieee80211_rx_list); 5697 5698 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5699 struct sk_buff *skb, struct napi_struct *napi) 5700 { 5701 struct sk_buff *tmp; 5702 LIST_HEAD(list); 5703 5704 5705 /* 5706 * key references and virtual interfaces are protected using RCU 5707 * and this requires that we are in a read-side RCU section during 5708 * receive processing 5709 */ 5710 rcu_read_lock(); 5711 ieee80211_rx_list(hw, pubsta, skb, &list); 5712 rcu_read_unlock(); 5713 5714 if (!napi) { 5715 netif_receive_skb_list(&list); 5716 return; 5717 } 5718 5719 list_for_each_entry_safe(skb, tmp, &list, list) { 5720 skb_list_del_init(skb); 5721 napi_gro_receive(napi, skb); 5722 } 5723 } 5724 EXPORT_SYMBOL(ieee80211_rx_napi); 5725 5726 /* This is a version of the rx handler that can be called from hard irq 5727 * context. Post the skb on the queue and schedule the tasklet */ 5728 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5729 { 5730 struct ieee80211_local *local = hw_to_local(hw); 5731 5732 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5733 5734 skb->pkt_type = IEEE80211_RX_MSG; 5735 skb_queue_tail(&local->skb_queue, skb); 5736 tasklet_schedule(&local->tasklet); 5737 } 5738 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5739