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 if (ieee80211_is_ext(hdr->frame_control)) 1530 return RX_CONTINUE; 1531 1532 /* 1533 * Drop duplicate 802.11 retransmissions 1534 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1535 */ 1536 1537 if (rx->skb->len < 24) 1538 return RX_CONTINUE; 1539 1540 if (ieee80211_is_ctl(hdr->frame_control) || 1541 ieee80211_is_any_nullfunc(hdr->frame_control)) 1542 return RX_CONTINUE; 1543 1544 if (!rx->sta) 1545 return RX_CONTINUE; 1546 1547 if (unlikely(is_multicast_ether_addr(hdr->addr1))) { 1548 struct ieee80211_sub_if_data *sdata = rx->sdata; 1549 u16 sn = ieee80211_get_sn(hdr); 1550 1551 if (!ieee80211_is_data_present(hdr->frame_control)) 1552 return RX_CONTINUE; 1553 1554 if (!ieee80211_vif_is_mld(&sdata->vif) || 1555 sdata->vif.type != NL80211_IFTYPE_STATION) 1556 return RX_CONTINUE; 1557 1558 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO && 1559 ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last)) 1560 return RX_DROP_U_DUP; 1561 1562 sdata->u.mgd.mcast_seq_last = sn; 1563 return RX_CONTINUE; 1564 } 1565 1566 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1567 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1568 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1569 rx->link_sta->rx_stats.num_duplicates++; 1570 return RX_DROP_U_DUP; 1571 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1572 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1573 } 1574 1575 return RX_CONTINUE; 1576 } 1577 1578 static ieee80211_rx_result debug_noinline 1579 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1580 { 1581 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1582 1583 /* Drop disallowed frame classes based on STA auth/assoc state; 1584 * IEEE 802.11, Chap 5.5. 1585 * 1586 * mac80211 filters only based on association state, i.e. it drops 1587 * Class 3 frames from not associated stations. hostapd sends 1588 * deauth/disassoc frames when needed. In addition, hostapd is 1589 * responsible for filtering on both auth and assoc states. 1590 */ 1591 1592 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1593 return ieee80211_rx_mesh_check(rx); 1594 1595 /* 1596 * Wi-Fi Aware (TM) 4.0 specification 6.2.5: 1597 * For NAN_DATA, unicast data frames must have A2 (source) 1598 * assigned to an active NDP. If not the frame must be dropped 1599 * and NAN Data Path termination frame should be sent. Notify 1600 * user space so it can do so. 1601 */ 1602 if (rx->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 1603 if (ieee80211_is_data(hdr->frame_control) && 1604 !is_multicast_ether_addr(hdr->addr1) && 1605 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) { 1606 if (cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1607 rx->link_id, GFP_ATOMIC)) 1608 return RX_DROP_U_SPURIOUS_NOTIF; 1609 return RX_DROP_U_SPURIOUS; 1610 } 1611 return RX_CONTINUE; 1612 } 1613 1614 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1615 ieee80211_is_pspoll(hdr->frame_control)) && 1616 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1617 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1618 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1619 /* 1620 * accept port control frames from the AP even when it's not 1621 * yet marked ASSOC to prevent a race where we don't set the 1622 * assoc bit quickly enough before it sends the first frame 1623 */ 1624 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1625 ieee80211_is_data_present(hdr->frame_control)) { 1626 unsigned int hdrlen; 1627 __be16 ethertype; 1628 1629 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1630 1631 if (rx->skb->len < hdrlen + 8) 1632 return RX_DROP_U_RUNT_DATA; 1633 1634 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1635 if (ethertype == rx->sdata->control_port_protocol) 1636 return RX_CONTINUE; 1637 } 1638 1639 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1640 cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1641 rx->link_id, GFP_ATOMIC)) 1642 return RX_DROP_U_SPURIOUS_NOTIF; 1643 1644 return RX_DROP_U_SPURIOUS; 1645 } 1646 1647 return RX_CONTINUE; 1648 } 1649 1650 1651 static ieee80211_rx_result debug_noinline 1652 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1653 { 1654 struct ieee80211_local *local; 1655 struct ieee80211_hdr *hdr; 1656 struct sk_buff *skb; 1657 1658 local = rx->local; 1659 skb = rx->skb; 1660 hdr = (struct ieee80211_hdr *) skb->data; 1661 1662 if (!local->pspolling) 1663 return RX_CONTINUE; 1664 1665 if (!ieee80211_has_fromds(hdr->frame_control)) 1666 /* this is not from AP */ 1667 return RX_CONTINUE; 1668 1669 if (!ieee80211_is_data(hdr->frame_control)) 1670 return RX_CONTINUE; 1671 1672 if (!ieee80211_has_moredata(hdr->frame_control)) { 1673 /* AP has no more frames buffered for us */ 1674 local->pspolling = false; 1675 return RX_CONTINUE; 1676 } 1677 1678 /* more data bit is set, let's request a new frame from the AP */ 1679 ieee80211_send_pspoll(local, rx->sdata); 1680 1681 return RX_CONTINUE; 1682 } 1683 1684 static void sta_ps_start(struct sta_info *sta) 1685 { 1686 struct ieee80211_sub_if_data *sdata = sta->sdata; 1687 struct ieee80211_local *local = sdata->local; 1688 struct ps_data *ps; 1689 int tid; 1690 1691 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1692 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1693 ps = &sdata->bss->ps; 1694 else 1695 return; 1696 1697 atomic_inc(&ps->num_sta_ps); 1698 set_sta_flag(sta, WLAN_STA_PS_STA); 1699 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1700 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1701 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1702 sta->sta.addr, sta->sta.aid); 1703 1704 ieee80211_clear_fast_xmit(sta); 1705 1706 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1707 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1708 struct txq_info *txqi = to_txq_info(txq); 1709 1710 spin_lock(&local->active_txq_lock[txq->ac]); 1711 if (!list_empty(&txqi->schedule_order)) 1712 list_del_init(&txqi->schedule_order); 1713 spin_unlock(&local->active_txq_lock[txq->ac]); 1714 1715 if (txq_has_queue(txq)) 1716 set_bit(tid, &sta->txq_buffered_tids); 1717 else 1718 clear_bit(tid, &sta->txq_buffered_tids); 1719 } 1720 1721 sta_info_recalc_tim(sta); 1722 } 1723 1724 static void sta_ps_end(struct sta_info *sta) 1725 { 1726 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1727 sta->sta.addr, sta->sta.aid); 1728 1729 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1730 /* 1731 * Clear the flag only if the other one is still set 1732 * so that the TX path won't start TX'ing new frames 1733 * directly ... In the case that the driver flag isn't 1734 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1735 */ 1736 clear_sta_flag(sta, WLAN_STA_PS_STA); 1737 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1738 sta->sta.addr, sta->sta.aid); 1739 return; 1740 } 1741 1742 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1743 clear_sta_flag(sta, WLAN_STA_PS_STA); 1744 ieee80211_sta_ps_deliver_wakeup(sta); 1745 } 1746 1747 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1748 { 1749 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1750 bool in_ps; 1751 1752 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1753 1754 /* Don't let the same PS state be set twice */ 1755 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1756 if ((start && in_ps) || (!start && !in_ps)) 1757 return -EINVAL; 1758 1759 if (start) 1760 sta_ps_start(sta); 1761 else 1762 sta_ps_end(sta); 1763 1764 return 0; 1765 } 1766 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1767 1768 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1769 { 1770 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1771 1772 if (test_sta_flag(sta, WLAN_STA_SP)) 1773 return; 1774 1775 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1776 ieee80211_sta_ps_deliver_poll_response(sta); 1777 else 1778 set_sta_flag(sta, WLAN_STA_PSPOLL); 1779 } 1780 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1781 1782 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1783 { 1784 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1785 int ac = ieee80211_ac_from_tid(tid); 1786 1787 /* 1788 * If this AC is not trigger-enabled do nothing unless the 1789 * driver is calling us after it already checked. 1790 * 1791 * NB: This could/should check a separate bitmap of trigger- 1792 * enabled queues, but for now we only implement uAPSD w/o 1793 * TSPEC changes to the ACs, so they're always the same. 1794 */ 1795 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1796 tid != IEEE80211_NUM_TIDS) 1797 return; 1798 1799 /* if we are in a service period, do nothing */ 1800 if (test_sta_flag(sta, WLAN_STA_SP)) 1801 return; 1802 1803 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1804 ieee80211_sta_ps_deliver_uapsd(sta); 1805 else 1806 set_sta_flag(sta, WLAN_STA_UAPSD); 1807 } 1808 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1809 1810 static ieee80211_rx_result debug_noinline 1811 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1812 { 1813 struct ieee80211_sub_if_data *sdata = rx->sdata; 1814 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1815 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1816 1817 if (!rx->sta) 1818 return RX_CONTINUE; 1819 1820 if (sdata->vif.type != NL80211_IFTYPE_AP && 1821 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1822 return RX_CONTINUE; 1823 1824 /* 1825 * The device handles station powersave, so don't do anything about 1826 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1827 * it to mac80211 since they're handled.) 1828 */ 1829 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1830 return RX_CONTINUE; 1831 1832 /* 1833 * Don't do anything if the station isn't already asleep. In 1834 * the uAPSD case, the station will probably be marked asleep, 1835 * in the PS-Poll case the station must be confused ... 1836 */ 1837 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1838 return RX_CONTINUE; 1839 1840 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1841 ieee80211_sta_pspoll(&rx->sta->sta); 1842 1843 /* Free PS Poll skb here instead of returning RX_DROP that would 1844 * count as an dropped frame. */ 1845 dev_kfree_skb(rx->skb); 1846 1847 return RX_QUEUED; 1848 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1849 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1850 ieee80211_has_pm(hdr->frame_control) && 1851 (ieee80211_is_data_qos(hdr->frame_control) || 1852 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1853 u8 tid = ieee80211_get_tid(hdr); 1854 1855 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1856 } 1857 1858 return RX_CONTINUE; 1859 } 1860 1861 static ieee80211_rx_result debug_noinline 1862 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1863 { 1864 struct sta_info *sta = rx->sta; 1865 struct link_sta_info *link_sta = rx->link_sta; 1866 struct sk_buff *skb = rx->skb; 1867 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1868 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1869 int i; 1870 1871 if (!sta || !link_sta) 1872 return RX_CONTINUE; 1873 1874 /* 1875 * Update last_rx only for IBSS packets which are for the current 1876 * BSSID and for station already AUTHORIZED to avoid keeping the 1877 * current IBSS network alive in cases where other STAs start 1878 * using different BSSID. This will also give the station another 1879 * chance to restart the authentication/authorization in case 1880 * something went wrong the first time. 1881 */ 1882 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1883 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1884 NL80211_IFTYPE_ADHOC); 1885 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1886 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1887 link_sta->rx_stats.last_rx = jiffies; 1888 if (ieee80211_is_data_present(hdr->frame_control) && 1889 !is_multicast_ether_addr(hdr->addr1)) 1890 link_sta->rx_stats.last_rate = 1891 sta_stats_encode_rate(status); 1892 } 1893 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1894 link_sta->rx_stats.last_rx = jiffies; 1895 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1896 !is_multicast_ether_addr(hdr->addr1)) { 1897 /* 1898 * Mesh beacons will update last_rx when if they are found to 1899 * match the current local configuration when processed. 1900 */ 1901 link_sta->rx_stats.last_rx = jiffies; 1902 if (ieee80211_is_data_present(hdr->frame_control)) 1903 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1904 } 1905 1906 link_sta->rx_stats.fragments++; 1907 1908 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1909 u64_stats_add(&link_sta->rx_stats.bytes, rx->skb->len); 1910 u64_stats_update_end(&link_sta->rx_stats.syncp); 1911 1912 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1913 link_sta->rx_stats.last_signal = status->signal; 1914 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1915 -status->signal); 1916 } 1917 1918 if (status->chains) { 1919 link_sta->rx_stats.chains = status->chains; 1920 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1921 int signal = status->chain_signal[i]; 1922 1923 if (!(status->chains & BIT(i))) 1924 continue; 1925 1926 link_sta->rx_stats.chain_signal_last[i] = signal; 1927 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1928 -signal); 1929 } 1930 } 1931 1932 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1933 return RX_CONTINUE; 1934 1935 /* 1936 * Change STA power saving mode only at the end of a frame 1937 * exchange sequence, and only for a data or management 1938 * frame as specified in IEEE 802.11-2016 11.2.3.2 1939 */ 1940 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1941 !ieee80211_has_morefrags(hdr->frame_control) && 1942 !is_multicast_ether_addr(hdr->addr1) && 1943 (ieee80211_is_mgmt(hdr->frame_control) || 1944 ieee80211_is_data(hdr->frame_control)) && 1945 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1946 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1947 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1948 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1949 if (!ieee80211_has_pm(hdr->frame_control)) 1950 sta_ps_end(sta); 1951 } else { 1952 if (ieee80211_has_pm(hdr->frame_control)) 1953 sta_ps_start(sta); 1954 } 1955 } 1956 1957 /* mesh power save support */ 1958 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1959 ieee80211_mps_rx_h_sta_process(sta, hdr); 1960 1961 /* 1962 * Drop (qos-)data::nullfunc frames silently, since they 1963 * are used only to control station power saving mode. 1964 */ 1965 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1966 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1967 1968 /* 1969 * If we receive a 4-addr nullfunc frame from a STA 1970 * that was not moved to a 4-addr STA vlan yet send 1971 * the event to userspace and for older hostapd drop 1972 * the frame to the monitor interface. 1973 */ 1974 if (ieee80211_has_a4(hdr->frame_control) && 1975 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1976 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1977 !rx->sdata->u.vlan.sta))) { 1978 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1979 cfg80211_rx_unexpected_4addr_frame( 1980 rx->sdata->dev, sta->sta.addr, 1981 rx->link_id, GFP_ATOMIC); 1982 return RX_DROP_U_UNEXPECTED_4ADDR_FRAME; 1983 } 1984 /* 1985 * Update counter and free packet here to avoid 1986 * counting this as a dropped packed. 1987 */ 1988 link_sta->rx_stats.packets++; 1989 dev_kfree_skb(rx->skb); 1990 return RX_QUEUED; 1991 } 1992 1993 return RX_CONTINUE; 1994 } /* ieee80211_rx_h_sta_process */ 1995 1996 static struct ieee80211_key * 1997 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1998 { 1999 struct ieee80211_key *key = NULL; 2000 int idx2; 2001 2002 /* Make sure key gets set if either BIGTK key index is set so that 2003 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 2004 * Beacon frames and Beacon frames that claim to use another BIGTK key 2005 * index (i.e., a key that we do not have). 2006 */ 2007 2008 if (idx < 0) { 2009 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 2010 idx2 = idx + 1; 2011 } else { 2012 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2013 idx2 = idx + 1; 2014 else 2015 idx2 = idx - 1; 2016 } 2017 2018 if (rx->link_sta) 2019 key = rcu_dereference(rx->link_sta->gtk[idx]); 2020 if (!key) 2021 key = rcu_dereference(rx->link->gtk[idx]); 2022 if (!key && rx->link_sta) 2023 key = rcu_dereference(rx->link_sta->gtk[idx2]); 2024 if (!key) 2025 key = rcu_dereference(rx->link->gtk[idx2]); 2026 2027 return key; 2028 } 2029 2030 static ieee80211_rx_result debug_noinline 2031 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 2032 { 2033 struct sk_buff *skb = rx->skb; 2034 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2035 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2036 int keyidx; 2037 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 2038 struct ieee80211_key *sta_ptk = NULL; 2039 struct ieee80211_key *ptk_idx = NULL; 2040 int mmie_keyidx = -1; 2041 __le16 fc; 2042 2043 if (ieee80211_is_ext(hdr->frame_control)) 2044 return RX_CONTINUE; 2045 2046 /* 2047 * Key selection 101 2048 * 2049 * There are five types of keys: 2050 * - GTK (group keys) 2051 * - IGTK (group keys for management frames) 2052 * - BIGTK (group keys for Beacon frames) 2053 * - PTK (pairwise keys) 2054 * - STK (station-to-station pairwise keys) 2055 * 2056 * When selecting a key, we have to distinguish between multicast 2057 * (including broadcast) and unicast frames, the latter can only 2058 * use PTKs and STKs while the former always use GTKs, IGTKs, and 2059 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 2060 * then unicast frames can also use key indices like GTKs. Hence, if we 2061 * don't have a PTK/STK we check the key index for a WEP key. 2062 * 2063 * Note that in a regular BSS, multicast frames are sent by the 2064 * AP only, associated stations unicast the frame to the AP first 2065 * which then multicasts it on their behalf. 2066 * 2067 * There is also a slight problem in IBSS mode: GTKs are negotiated 2068 * with each station, that is something we don't currently handle. 2069 * The spec seems to expect that one negotiates the same key with 2070 * every station but there's no such requirement; VLANs could be 2071 * possible. 2072 */ 2073 2074 /* start without a key */ 2075 rx->key = NULL; 2076 fc = hdr->frame_control; 2077 2078 if (rx->sta) { 2079 int keyid = rx->sta->ptk_idx; 2080 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 2081 2082 if (ieee80211_has_protected(fc) && 2083 !(status->flag & RX_FLAG_IV_STRIPPED)) { 2084 keyid = ieee80211_get_keyid(rx->skb); 2085 2086 if (unlikely(keyid < 0)) 2087 return RX_DROP_U_NO_KEY_ID; 2088 2089 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 2090 } 2091 } 2092 2093 if (!ieee80211_has_protected(fc)) 2094 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 2095 2096 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 2097 rx->key = ptk_idx ? ptk_idx : sta_ptk; 2098 if ((status->flag & RX_FLAG_DECRYPTED) && 2099 (status->flag & RX_FLAG_IV_STRIPPED)) 2100 return RX_CONTINUE; 2101 /* Skip decryption if the frame is not protected. */ 2102 if (!ieee80211_has_protected(fc)) 2103 return RX_CONTINUE; 2104 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 2105 /* Broadcast/multicast robust management frame / BIP */ 2106 if ((status->flag & RX_FLAG_DECRYPTED) && 2107 (status->flag & RX_FLAG_IV_STRIPPED)) 2108 return RX_CONTINUE; 2109 2110 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 2111 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 2112 NUM_DEFAULT_BEACON_KEYS) { 2113 if (rx->sdata->dev) 2114 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2115 skb->data, 2116 skb->len); 2117 return RX_DROP_U_BAD_BCN_KEYIDX; 2118 } 2119 2120 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2121 if (!rx->key) 2122 return RX_CONTINUE; /* Beacon protection not in use */ 2123 } else if (mmie_keyidx >= 0) { 2124 /* Broadcast/multicast robust management frame / BIP */ 2125 if ((status->flag & RX_FLAG_DECRYPTED) && 2126 (status->flag & RX_FLAG_IV_STRIPPED)) 2127 return RX_CONTINUE; 2128 2129 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2130 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2131 return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2132 if (rx->link_sta) { 2133 if (ieee80211_is_group_privacy_action(skb) && 2134 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2135 return RX_DROP_U_UNPROTECTED; 2136 2137 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2138 } 2139 if (!rx->key) 2140 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2141 } else if (!ieee80211_has_protected(fc)) { 2142 /* 2143 * The frame was not protected, so skip decryption. However, we 2144 * need to set rx->key if there is a key that could have been 2145 * used so that the frame may be dropped if encryption would 2146 * have been expected. 2147 */ 2148 struct ieee80211_key *key = NULL; 2149 int i; 2150 2151 if (ieee80211_is_beacon(fc)) { 2152 key = ieee80211_rx_get_bigtk(rx, -1); 2153 } else if (ieee80211_is_mgmt(fc) && 2154 is_multicast_ether_addr(hdr->addr1)) { 2155 key = rcu_dereference(rx->link->default_mgmt_key); 2156 } else { 2157 if (rx->link_sta) { 2158 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2159 key = rcu_dereference(rx->link_sta->gtk[i]); 2160 if (key) 2161 break; 2162 } 2163 } 2164 if (!key) { 2165 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2166 key = rcu_dereference(rx->link->gtk[i]); 2167 if (key) 2168 break; 2169 } 2170 } 2171 } 2172 if (key) 2173 rx->key = key; 2174 return RX_CONTINUE; 2175 } else { 2176 /* 2177 * The device doesn't give us the IV so we won't be 2178 * able to look up the key. That's ok though, we 2179 * don't need to decrypt the frame, we just won't 2180 * be able to keep statistics accurate. 2181 * Except for key threshold notifications, should 2182 * we somehow allow the driver to tell us which key 2183 * the hardware used if this flag is set? 2184 */ 2185 if ((status->flag & RX_FLAG_DECRYPTED) && 2186 (status->flag & RX_FLAG_IV_STRIPPED)) 2187 return RX_CONTINUE; 2188 2189 keyidx = ieee80211_get_keyid(rx->skb); 2190 2191 if (unlikely(keyidx < 0)) 2192 return RX_DROP_U_NO_KEY_ID; 2193 2194 /* check per-station GTK first, if multicast packet */ 2195 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2196 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2197 2198 /* if not found, try default key */ 2199 if (!rx->key) { 2200 if (is_multicast_ether_addr(hdr->addr1)) 2201 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2202 if (!rx->key) 2203 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2204 2205 /* 2206 * RSNA-protected unicast frames should always be 2207 * sent with pairwise or station-to-station keys, 2208 * but for WEP we allow using a key index as well. 2209 */ 2210 if (rx->key && 2211 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2212 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2213 !is_multicast_ether_addr(hdr->addr1)) 2214 rx->key = NULL; 2215 } 2216 } 2217 2218 if (rx->key) { 2219 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2220 return RX_DROP_U_KEY_TAINTED; 2221 2222 /* TODO: add threshold stuff again */ 2223 } else { 2224 return RX_DROP_U_UNPROTECTED; 2225 } 2226 2227 switch (rx->key->conf.cipher) { 2228 case WLAN_CIPHER_SUITE_WEP40: 2229 case WLAN_CIPHER_SUITE_WEP104: 2230 result = ieee80211_crypto_wep_decrypt(rx); 2231 break; 2232 case WLAN_CIPHER_SUITE_TKIP: 2233 result = ieee80211_crypto_tkip_decrypt(rx); 2234 break; 2235 case WLAN_CIPHER_SUITE_CCMP: 2236 result = ieee80211_crypto_ccmp_decrypt( 2237 rx, IEEE80211_CCMP_MIC_LEN); 2238 break; 2239 case WLAN_CIPHER_SUITE_CCMP_256: 2240 result = ieee80211_crypto_ccmp_decrypt( 2241 rx, IEEE80211_CCMP_256_MIC_LEN); 2242 break; 2243 case WLAN_CIPHER_SUITE_AES_CMAC: 2244 result = ieee80211_crypto_aes_cmac_decrypt( 2245 rx, IEEE80211_CMAC_128_MIC_LEN); 2246 break; 2247 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2248 result = ieee80211_crypto_aes_cmac_decrypt( 2249 rx, IEEE80211_CMAC_256_MIC_LEN); 2250 break; 2251 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2252 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2253 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2254 break; 2255 case WLAN_CIPHER_SUITE_GCMP: 2256 case WLAN_CIPHER_SUITE_GCMP_256: 2257 result = ieee80211_crypto_gcmp_decrypt(rx); 2258 break; 2259 default: 2260 result = RX_DROP_U_BAD_CIPHER; 2261 } 2262 2263 /* the hdr variable is invalid after the decrypt handlers */ 2264 2265 /* either the frame has been decrypted or will be dropped */ 2266 status->flag |= RX_FLAG_DECRYPTED; 2267 2268 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2269 rx->sdata->dev)) 2270 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2271 skb->data, skb->len); 2272 2273 return result; 2274 } 2275 2276 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2277 { 2278 int i; 2279 2280 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2281 skb_queue_head_init(&cache->entries[i].skb_list); 2282 } 2283 2284 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2285 { 2286 int i; 2287 2288 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2289 __skb_queue_purge(&cache->entries[i].skb_list); 2290 } 2291 2292 static inline struct ieee80211_fragment_entry * 2293 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2294 unsigned int frag, unsigned int seq, int rx_queue, 2295 struct sk_buff **skb) 2296 { 2297 struct ieee80211_fragment_entry *entry; 2298 2299 entry = &cache->entries[cache->next++]; 2300 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2301 cache->next = 0; 2302 2303 __skb_queue_purge(&entry->skb_list); 2304 2305 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2306 *skb = NULL; 2307 entry->first_frag_time = jiffies; 2308 entry->seq = seq; 2309 entry->rx_queue = rx_queue; 2310 entry->last_frag = frag; 2311 entry->check_sequential_pn = false; 2312 entry->extra_len = 0; 2313 2314 return entry; 2315 } 2316 2317 static inline struct ieee80211_fragment_entry * 2318 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2319 unsigned int frag, unsigned int seq, 2320 int rx_queue, struct ieee80211_hdr *hdr) 2321 { 2322 struct ieee80211_fragment_entry *entry; 2323 int i, idx; 2324 2325 idx = cache->next; 2326 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2327 struct ieee80211_hdr *f_hdr; 2328 struct sk_buff *f_skb; 2329 2330 idx--; 2331 if (idx < 0) 2332 idx = IEEE80211_FRAGMENT_MAX - 1; 2333 2334 entry = &cache->entries[idx]; 2335 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2336 entry->rx_queue != rx_queue || 2337 entry->last_frag + 1 != frag) 2338 continue; 2339 2340 f_skb = __skb_peek(&entry->skb_list); 2341 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2342 2343 /* 2344 * Check ftype and addresses are equal, else check next fragment 2345 */ 2346 if (((hdr->frame_control ^ f_hdr->frame_control) & 2347 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2348 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2349 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2350 continue; 2351 2352 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2353 __skb_queue_purge(&entry->skb_list); 2354 continue; 2355 } 2356 return entry; 2357 } 2358 2359 return NULL; 2360 } 2361 2362 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2363 { 2364 return rx->key && 2365 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2366 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2367 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2368 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2369 ieee80211_has_protected(fc); 2370 } 2371 2372 static ieee80211_rx_result debug_noinline 2373 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2374 { 2375 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2376 struct ieee80211_hdr *hdr; 2377 u16 sc; 2378 __le16 fc; 2379 unsigned int frag, seq; 2380 struct ieee80211_fragment_entry *entry; 2381 struct sk_buff *skb; 2382 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2383 2384 hdr = (struct ieee80211_hdr *)rx->skb->data; 2385 fc = hdr->frame_control; 2386 2387 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2388 return RX_CONTINUE; 2389 2390 sc = le16_to_cpu(hdr->seq_ctrl); 2391 frag = sc & IEEE80211_SCTL_FRAG; 2392 2393 if (rx->sta) 2394 cache = &rx->sta->frags; 2395 2396 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2397 goto out; 2398 2399 if (is_multicast_ether_addr(hdr->addr1)) 2400 return RX_DROP_U_MCAST_FRAGMENT; 2401 2402 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2403 2404 if (skb_linearize(rx->skb)) 2405 return RX_DROP_U_OOM; 2406 2407 /* 2408 * skb_linearize() might change the skb->data and 2409 * previously cached variables (in this case, hdr) need to 2410 * be refreshed with the new data. 2411 */ 2412 hdr = (struct ieee80211_hdr *)rx->skb->data; 2413 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2414 2415 if (frag == 0) { 2416 /* This is the first fragment of a new frame. */ 2417 entry = ieee80211_reassemble_add(cache, frag, seq, 2418 rx->seqno_idx, &(rx->skb)); 2419 if (requires_sequential_pn(rx, fc)) { 2420 int queue = rx->security_idx; 2421 2422 /* Store CCMP/GCMP PN so that we can verify that the 2423 * next fragment has a sequential PN value. 2424 */ 2425 entry->check_sequential_pn = true; 2426 entry->is_protected = true; 2427 entry->key_color = rx->key->color; 2428 memcpy(entry->last_pn, 2429 rx->key->u.ccmp.rx_pn[queue], 2430 IEEE80211_CCMP_PN_LEN); 2431 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2432 u.ccmp.rx_pn) != 2433 offsetof(struct ieee80211_key, 2434 u.gcmp.rx_pn)); 2435 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2436 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2437 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2438 IEEE80211_GCMP_PN_LEN); 2439 } else if (rx->key && 2440 (ieee80211_has_protected(fc) || 2441 (status->flag & RX_FLAG_DECRYPTED))) { 2442 entry->is_protected = true; 2443 entry->key_color = rx->key->color; 2444 } 2445 return RX_QUEUED; 2446 } 2447 2448 /* This is a fragment for a frame that should already be pending in 2449 * fragment cache. Add this fragment to the end of the pending entry. 2450 */ 2451 entry = ieee80211_reassemble_find(cache, frag, seq, 2452 rx->seqno_idx, hdr); 2453 if (!entry) { 2454 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2455 return RX_DROP_U_DEFRAG_MISMATCH; 2456 } 2457 2458 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2459 * MPDU PN values are not incrementing in steps of 1." 2460 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2461 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2462 */ 2463 if (entry->check_sequential_pn) { 2464 int i; 2465 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2466 2467 if (!requires_sequential_pn(rx, fc)) 2468 return RX_DROP_U_NONSEQ_PN; 2469 2470 /* Prevent mixed key and fragment cache attacks */ 2471 if (entry->key_color != rx->key->color) 2472 return RX_DROP_U_BAD_KEY_COLOR; 2473 2474 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2475 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2476 pn[i]++; 2477 if (pn[i]) 2478 break; 2479 } 2480 2481 rpn = rx->ccm_gcm.pn; 2482 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2483 return RX_DROP_U_REPLAY; 2484 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2485 } else if (entry->is_protected && 2486 (!rx->key || 2487 (!ieee80211_has_protected(fc) && 2488 !(status->flag & RX_FLAG_DECRYPTED)) || 2489 rx->key->color != entry->key_color)) { 2490 /* Drop this as a mixed key or fragment cache attack, even 2491 * if for TKIP Michael MIC should protect us, and WEP is a 2492 * lost cause anyway. 2493 */ 2494 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2495 } else if (entry->is_protected && rx->key && 2496 entry->key_color != rx->key->color && 2497 (status->flag & RX_FLAG_DECRYPTED)) { 2498 return RX_DROP_U_BAD_KEY_COLOR; 2499 } 2500 2501 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2502 __skb_queue_tail(&entry->skb_list, rx->skb); 2503 entry->last_frag = frag; 2504 entry->extra_len += rx->skb->len; 2505 if (ieee80211_has_morefrags(fc)) { 2506 rx->skb = NULL; 2507 return RX_QUEUED; 2508 } 2509 2510 rx->skb = __skb_dequeue(&entry->skb_list); 2511 if (skb_tailroom(rx->skb) < entry->extra_len) { 2512 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2513 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2514 GFP_ATOMIC))) { 2515 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2516 __skb_queue_purge(&entry->skb_list); 2517 return RX_DROP_U_OOM; 2518 } 2519 } 2520 while ((skb = __skb_dequeue(&entry->skb_list))) { 2521 skb_put_data(rx->skb, skb->data, skb->len); 2522 dev_kfree_skb(skb); 2523 } 2524 2525 out: 2526 ieee80211_led_rx(rx->local); 2527 if (rx->sta) 2528 rx->link_sta->rx_stats.packets++; 2529 return RX_CONTINUE; 2530 } 2531 2532 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2533 { 2534 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2535 return -EACCES; 2536 2537 return 0; 2538 } 2539 2540 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2541 { 2542 struct sk_buff *skb = rx->skb; 2543 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2544 2545 /* 2546 * Pass through unencrypted frames if the hardware has 2547 * decrypted them already. 2548 */ 2549 if (status->flag & RX_FLAG_DECRYPTED) 2550 return 0; 2551 2552 /* Drop unencrypted frames if key is set. */ 2553 if (unlikely(!ieee80211_has_protected(fc) && 2554 !ieee80211_is_any_nullfunc(fc) && 2555 ieee80211_is_data(fc) && rx->key)) 2556 return -EACCES; 2557 2558 return 0; 2559 } 2560 2561 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2562 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2563 { 2564 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2565 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2566 __le16 fc = mgmt->frame_control; 2567 2568 /* 2569 * Pass through unencrypted frames if the hardware has 2570 * decrypted them already. 2571 */ 2572 if (status->flag & RX_FLAG_DECRYPTED) 2573 return RX_CONTINUE; 2574 2575 /* drop unicast protected dual (that wasn't protected) */ 2576 if (ieee80211_is_action(fc) && 2577 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2578 return RX_DROP_U_UNPROT_DUAL; 2579 2580 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2581 if (unlikely(!ieee80211_has_protected(fc) && 2582 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2583 if (ieee80211_is_deauth(fc) || 2584 ieee80211_is_disassoc(fc)) { 2585 /* 2586 * Permit unprotected deauth/disassoc frames 2587 * during 4-way-HS (key is installed after HS). 2588 */ 2589 if (!rx->key) 2590 return RX_CONTINUE; 2591 2592 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2593 rx->skb->data, 2594 rx->skb->len); 2595 } 2596 return RX_DROP_U_UNPROT_UCAST_MGMT; 2597 } 2598 /* BIP does not use Protected field, so need to check MMIE */ 2599 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2600 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2601 if (ieee80211_is_deauth(fc) || 2602 ieee80211_is_disassoc(fc)) 2603 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2604 rx->skb->data, 2605 rx->skb->len); 2606 return RX_DROP_U_UNPROT_MCAST_MGMT; 2607 } 2608 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2609 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2610 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2611 rx->skb->data, 2612 rx->skb->len); 2613 return RX_DROP_U_UNPROT_BEACON; 2614 } 2615 /* 2616 * When using MFP, Action frames are not allowed prior to 2617 * having configured keys. 2618 */ 2619 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2620 ieee80211_is_robust_mgmt_frame(rx->skb))) 2621 return RX_DROP_U_UNPROT_ACTION; 2622 2623 /* drop unicast public action frames when using MPF */ 2624 if (is_unicast_ether_addr(mgmt->da) && 2625 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2626 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2627 } 2628 2629 /* 2630 * Drop robust action frames before assoc regardless of MFP state, 2631 * after assoc we also have decided on MFP or not. 2632 */ 2633 if (ieee80211_is_action(fc) && 2634 ieee80211_is_robust_mgmt_frame(rx->skb) && 2635 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2636 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2637 2638 /* 2639 * Drop unprotected (Re)Association Request/Response frame received from 2640 * an EPP Peer. 2641 */ 2642 if (!ieee80211_has_protected(fc) && 2643 ieee80211_require_encrypted_assoc(fc, rx->sta)) 2644 return RX_DROP_U_UNPROT_UCAST_MGMT; 2645 2646 return RX_CONTINUE; 2647 } 2648 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2649 2650 static ieee80211_rx_result 2651 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2652 { 2653 struct ieee80211_sub_if_data *sdata = rx->sdata; 2654 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2655 bool check_port_control = false; 2656 struct ethhdr *ehdr; 2657 int ret; 2658 2659 *port_control = false; 2660 if (ieee80211_has_a4(hdr->frame_control) && 2661 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2662 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2663 2664 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2665 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2666 if (!sdata->u.mgd.use_4addr) 2667 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2668 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2669 check_port_control = true; 2670 } 2671 2672 if (is_multicast_ether_addr(hdr->addr1) && 2673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2674 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2675 2676 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2677 if (ret < 0) 2678 return RX_DROP_U_INVALID_8023; 2679 2680 ehdr = (struct ethhdr *) rx->skb->data; 2681 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2682 *port_control = true; 2683 else if (check_port_control) 2684 return RX_DROP_U_NOT_PORT_CONTROL; 2685 2686 return RX_CONTINUE; 2687 } 2688 2689 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2690 const u8 *addr, int *out_link_id) 2691 { 2692 unsigned int link_id; 2693 2694 /* non-MLO, or MLD address replaced by hardware */ 2695 if (ether_addr_equal(sdata->vif.addr, addr)) 2696 return true; 2697 2698 if (!ieee80211_vif_is_mld(&sdata->vif)) 2699 return false; 2700 2701 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2702 struct ieee80211_bss_conf *conf; 2703 2704 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2705 2706 if (!conf) 2707 continue; 2708 if (ether_addr_equal(conf->addr, addr)) { 2709 if (out_link_id) 2710 *out_link_id = link_id; 2711 return true; 2712 } 2713 } 2714 2715 return false; 2716 } 2717 2718 /* 2719 * requires that rx->skb is a frame with ethernet header 2720 */ 2721 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2722 { 2723 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2724 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2725 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2726 2727 /* 2728 * Allow EAPOL frames to us/the PAE group address regardless of 2729 * whether the frame was encrypted or not, and always disallow 2730 * all other destination addresses for them. 2731 */ 2732 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2733 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2734 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2735 2736 if (ieee80211_802_1x_port_control(rx) || 2737 ieee80211_drop_unencrypted(rx, fc)) 2738 return false; 2739 2740 return true; 2741 } 2742 2743 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2744 struct ieee80211_rx_data *rx) 2745 { 2746 struct ieee80211_sub_if_data *sdata = rx->sdata; 2747 struct net_device *dev = sdata->dev; 2748 2749 if (unlikely((skb->protocol == sdata->control_port_protocol || 2750 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2751 !sdata->control_port_no_preauth)) && 2752 sdata->control_port_over_nl80211)) { 2753 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2754 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2755 2756 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2757 dev_kfree_skb(skb); 2758 } else { 2759 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2760 2761 memset(skb->cb, 0, sizeof(skb->cb)); 2762 2763 /* 2764 * 802.1X over 802.11 requires that the authenticator address 2765 * be used for EAPOL frames. However, 802.1X allows the use of 2766 * the PAE group address instead. If the interface is part of 2767 * a bridge and we pass the frame with the PAE group address, 2768 * then the bridge will forward it to the network (even if the 2769 * client was not associated yet), which isn't supposed to 2770 * happen. 2771 * To avoid that, rewrite the destination address to our own 2772 * address, so that the authenticator (e.g. hostapd) will see 2773 * the frame, but bridge won't forward it anywhere else. Note 2774 * that due to earlier filtering, the only other address can 2775 * be the PAE group address, unless the hardware allowed them 2776 * through in 802.3 offloaded mode. 2777 */ 2778 if (unlikely(skb->protocol == sdata->control_port_protocol && 2779 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2780 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2781 2782 /* deliver to local stack */ 2783 if (rx->list) 2784 list_add_tail(&skb->list, rx->list); 2785 else 2786 netif_receive_skb(skb); 2787 } 2788 } 2789 2790 /* 2791 * requires that rx->skb is a frame with ethernet header 2792 */ 2793 static void 2794 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2795 { 2796 struct ieee80211_sub_if_data *sdata = rx->sdata; 2797 struct net_device *dev = sdata->dev; 2798 struct sk_buff *skb, *xmit_skb; 2799 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2800 struct sta_info *dsta; 2801 2802 skb = rx->skb; 2803 xmit_skb = NULL; 2804 2805 dev_sw_netstats_rx_add(dev, skb->len); 2806 2807 if (rx->sta) { 2808 /* The seqno index has the same property as needed 2809 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2810 * for non-QoS-data frames. Here we know it's a data 2811 * frame, so count MSDUs. 2812 */ 2813 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2814 u64_stats_inc(&rx->link_sta->rx_stats.msdu[rx->seqno_idx]); 2815 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2816 } 2817 2818 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2819 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2820 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2821 ehdr->h_proto != rx->sdata->control_port_protocol && 2822 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2823 if (is_multicast_ether_addr(ehdr->h_dest) && 2824 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2825 /* 2826 * send multicast frames both to higher layers in 2827 * local net stack and back to the wireless medium 2828 */ 2829 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2830 if (!xmit_skb) 2831 net_info_ratelimited("%s: failed to clone multicast frame\n", 2832 dev->name); 2833 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2834 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2835 dsta = sta_info_get(sdata, ehdr->h_dest); 2836 if (dsta) { 2837 /* 2838 * The destination station is associated to 2839 * this AP (in this VLAN), so send the frame 2840 * directly to it and do not pass it to local 2841 * net stack. 2842 */ 2843 xmit_skb = skb; 2844 skb = NULL; 2845 } 2846 } 2847 } 2848 2849 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2850 if (skb) { 2851 /* 'align' will only take the values 0 or 2 here since all 2852 * frames are required to be aligned to 2-byte boundaries 2853 * when being passed to mac80211; the code here works just 2854 * as well if that isn't true, but mac80211 assumes it can 2855 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2856 */ 2857 int align; 2858 2859 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2860 if (align) { 2861 if (WARN_ON(skb_headroom(skb) < 3)) { 2862 dev_kfree_skb(skb); 2863 skb = NULL; 2864 } else { 2865 u8 *data = skb->data; 2866 size_t len = skb_headlen(skb); 2867 skb->data -= align; 2868 memmove(skb->data, data, len); 2869 skb_set_tail_pointer(skb, len); 2870 } 2871 } 2872 } 2873 #endif 2874 2875 if (skb) { 2876 skb->protocol = eth_type_trans(skb, dev); 2877 ieee80211_deliver_skb_to_local_stack(skb, rx); 2878 } 2879 2880 if (xmit_skb) { 2881 /* 2882 * Send to wireless media and increase priority by 256 to 2883 * keep the received priority instead of reclassifying 2884 * the frame (see cfg80211_classify8021d). 2885 */ 2886 xmit_skb->priority += 256; 2887 xmit_skb->protocol = htons(ETH_P_802_3); 2888 skb_reset_network_header(xmit_skb); 2889 skb_reset_mac_header(xmit_skb); 2890 dev_queue_xmit(xmit_skb); 2891 } 2892 } 2893 2894 #ifdef CONFIG_MAC80211_MESH 2895 static bool 2896 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2897 struct sk_buff *skb, int hdrlen) 2898 { 2899 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2900 struct ieee80211_mesh_fast_tx_key key = { 2901 .type = MESH_FAST_TX_TYPE_FORWARDED 2902 }; 2903 struct ieee80211_mesh_fast_tx *entry; 2904 struct ieee80211s_hdr *mesh_hdr; 2905 struct tid_ampdu_tx *tid_tx; 2906 struct sta_info *sta; 2907 struct ethhdr eth; 2908 u8 tid; 2909 2910 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2911 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2912 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2913 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2914 ether_addr_copy(key.addr, skb->data); 2915 else 2916 return false; 2917 2918 entry = mesh_fast_tx_get(sdata, &key); 2919 if (!entry) 2920 return false; 2921 2922 sta = rcu_dereference(entry->mpath->next_hop); 2923 if (!sta) 2924 return false; 2925 2926 if (skb_linearize(skb)) 2927 return false; 2928 2929 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2930 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2931 if (tid_tx) { 2932 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2933 return false; 2934 2935 if (tid_tx->timeout) 2936 tid_tx->last_tx = jiffies; 2937 } 2938 2939 ieee80211_aggr_check(sdata, sta, skb); 2940 2941 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2942 &skb->protocol)) 2943 hdrlen += ETH_ALEN; 2944 else 2945 skb->protocol = htons(skb->len - hdrlen); 2946 skb_set_network_header(skb, hdrlen + 2); 2947 2948 skb->dev = sdata->dev; 2949 memcpy(ð, skb->data, ETH_HLEN - 2); 2950 skb_pull(skb, 2); 2951 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2952 eth.h_dest, eth.h_source); 2953 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2954 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2955 2956 return true; 2957 } 2958 #endif 2959 2960 static ieee80211_rx_result 2961 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2962 struct sk_buff *skb) 2963 { 2964 #ifdef CONFIG_MAC80211_MESH 2965 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2966 struct ieee80211_local *local = sdata->local; 2967 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2968 struct ieee80211_hdr hdr = { 2969 .frame_control = cpu_to_le16(fc) 2970 }; 2971 struct ieee80211_hdr *fwd_hdr; 2972 struct ieee80211s_hdr *mesh_hdr; 2973 struct ieee80211_tx_info *info; 2974 struct sk_buff *fwd_skb; 2975 struct ethhdr *eth; 2976 bool multicast; 2977 int tailroom = 0; 2978 int hdrlen, mesh_hdrlen; 2979 u8 *qos; 2980 2981 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2982 return RX_CONTINUE; 2983 2984 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2985 return RX_DROP_U_RUNT_MESH_DATA; 2986 2987 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2988 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2989 2990 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2991 return RX_DROP_U_RUNT_MESH_DATA; 2992 2993 eth = (struct ethhdr *)skb->data; 2994 multicast = is_multicast_ether_addr(eth->h_dest); 2995 2996 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2997 if (!mesh_hdr->ttl) 2998 return RX_DROP_U_MESH_NO_TTL; 2999 3000 /* frame is in RMC, don't forward */ 3001 if (is_multicast_ether_addr(eth->h_dest) && 3002 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 3003 return RX_DROP_U_MESH_RMC; 3004 3005 /* forward packet */ 3006 if (sdata->crypto_tx_tailroom_needed_cnt) 3007 tailroom = IEEE80211_ENCRYPT_TAILROOM; 3008 3009 if (mesh_hdr->flags & MESH_FLAGS_AE) { 3010 struct mesh_path *mppath; 3011 char *proxied_addr; 3012 bool update = false; 3013 3014 if (multicast) 3015 proxied_addr = mesh_hdr->eaddr1; 3016 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 3017 /* has_a4 already checked in ieee80211_rx_mesh_check */ 3018 proxied_addr = mesh_hdr->eaddr2; 3019 else 3020 return RX_DROP_U_MESH_BAD_AE; 3021 3022 rcu_read_lock(); 3023 mppath = mpp_path_lookup(sdata, proxied_addr); 3024 if (!mppath) { 3025 mpp_path_add(sdata, proxied_addr, eth->h_source); 3026 } else { 3027 spin_lock_bh(&mppath->state_lock); 3028 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 3029 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 3030 update = true; 3031 } 3032 mppath->exp_time = jiffies; 3033 spin_unlock_bh(&mppath->state_lock); 3034 } 3035 3036 /* flush fast xmit cache if the address path changed */ 3037 if (update) 3038 mesh_fast_tx_flush_addr(sdata, proxied_addr); 3039 3040 rcu_read_unlock(); 3041 } 3042 3043 /* Frame has reached destination. Don't forward */ 3044 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 3045 goto rx_accept; 3046 3047 if (!--mesh_hdr->ttl) { 3048 if (multicast) 3049 goto rx_accept; 3050 3051 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 3052 return RX_DROP_U_MESH_TTL_EXPIRED; 3053 } 3054 3055 if (!ifmsh->mshcfg.dot11MeshForwarding) { 3056 if (is_multicast_ether_addr(eth->h_dest)) 3057 goto rx_accept; 3058 3059 return RX_DROP_U_MESH_NOT_FORWARDING; 3060 } 3061 3062 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 3063 3064 if (!multicast && 3065 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 3066 return RX_QUEUED; 3067 3068 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 3069 eth->h_dest, eth->h_source); 3070 hdrlen = ieee80211_hdrlen(hdr.frame_control); 3071 if (multicast) { 3072 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 3073 3074 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 3075 IEEE80211_ENCRYPT_HEADROOM, 3076 tailroom, GFP_ATOMIC); 3077 if (!fwd_skb) 3078 goto rx_accept; 3079 } else { 3080 fwd_skb = skb; 3081 skb = NULL; 3082 3083 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 3084 return RX_DROP_U_OOM; 3085 3086 if (skb_linearize(fwd_skb)) 3087 return RX_DROP_U_OOM; 3088 } 3089 3090 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 3091 memcpy(fwd_hdr, &hdr, hdrlen - 2); 3092 qos = ieee80211_get_qos_ctl(fwd_hdr); 3093 qos[0] = qos[1] = 0; 3094 3095 skb_reset_mac_header(fwd_skb); 3096 hdrlen += mesh_hdrlen; 3097 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 3098 &fwd_skb->protocol)) 3099 hdrlen += ETH_ALEN; 3100 else 3101 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 3102 skb_set_network_header(fwd_skb, hdrlen + 2); 3103 3104 info = IEEE80211_SKB_CB(fwd_skb); 3105 memset(info, 0, sizeof(*info)); 3106 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3107 info->control.vif = &sdata->vif; 3108 info->control.jiffies = jiffies; 3109 fwd_skb->dev = sdata->dev; 3110 if (multicast) { 3111 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 3112 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 3113 /* update power mode indication when forwarding */ 3114 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 3115 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 3116 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3117 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3118 } else { 3119 /* unable to resolve next hop */ 3120 if (sta) 3121 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3122 hdr.addr3, 0, 3123 WLAN_REASON_MESH_PATH_NOFORWARD, 3124 sta->sta.addr); 3125 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3126 kfree_skb(fwd_skb); 3127 goto rx_accept; 3128 } 3129 3130 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3131 ieee80211_set_qos_hdr(sdata, fwd_skb); 3132 ieee80211_add_pending_skb(local, fwd_skb); 3133 3134 rx_accept: 3135 if (!skb) 3136 return RX_QUEUED; 3137 3138 ieee80211_strip_8023_mesh_hdr(skb); 3139 #endif 3140 3141 return RX_CONTINUE; 3142 } 3143 3144 static ieee80211_rx_result debug_noinline 3145 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3146 { 3147 struct net_device *dev = rx->sdata->dev; 3148 struct sk_buff *skb = rx->skb; 3149 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3150 __le16 fc = hdr->frame_control; 3151 struct sk_buff_head frame_list; 3152 struct ethhdr ethhdr; 3153 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3154 3155 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3156 check_da = NULL; 3157 check_sa = NULL; 3158 } else switch (rx->sdata->vif.type) { 3159 case NL80211_IFTYPE_AP: 3160 case NL80211_IFTYPE_AP_VLAN: 3161 check_da = NULL; 3162 break; 3163 case NL80211_IFTYPE_STATION: 3164 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3165 check_sa = NULL; 3166 break; 3167 case NL80211_IFTYPE_MESH_POINT: 3168 check_sa = NULL; 3169 check_da = NULL; 3170 break; 3171 default: 3172 break; 3173 } 3174 3175 skb->dev = dev; 3176 __skb_queue_head_init(&frame_list); 3177 3178 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3179 rx->sdata->vif.addr, 3180 rx->sdata->vif.type, 3181 data_offset, true)) 3182 return RX_DROP_U_BAD_AMSDU; 3183 3184 if (rx->sta->amsdu_mesh_control < 0) { 3185 s8 valid = -1; 3186 int i; 3187 3188 for (i = 0; i <= 2; i++) { 3189 if (!ieee80211_is_valid_amsdu(skb, i)) 3190 continue; 3191 3192 if (valid >= 0) { 3193 /* ambiguous */ 3194 valid = -1; 3195 break; 3196 } 3197 3198 valid = i; 3199 } 3200 3201 rx->sta->amsdu_mesh_control = valid; 3202 } 3203 3204 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3205 rx->sdata->vif.type, 3206 rx->local->hw.extra_tx_headroom, 3207 check_da, check_sa, 3208 rx->sta->amsdu_mesh_control); 3209 3210 while (!skb_queue_empty(&frame_list)) { 3211 rx->skb = __skb_dequeue(&frame_list); 3212 3213 switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) { 3214 case RX_QUEUED: 3215 break; 3216 case RX_CONTINUE: 3217 if (ieee80211_frame_allowed(rx, fc)) { 3218 ieee80211_deliver_skb(rx); 3219 break; 3220 } 3221 fallthrough; 3222 default: 3223 dev_kfree_skb(rx->skb); 3224 } 3225 } 3226 3227 return RX_QUEUED; 3228 } 3229 3230 static ieee80211_rx_result debug_noinline 3231 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3232 { 3233 struct sk_buff *skb = rx->skb; 3234 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3235 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3236 __le16 fc = hdr->frame_control; 3237 3238 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3239 return RX_CONTINUE; 3240 3241 if (unlikely(!ieee80211_is_data(fc))) 3242 return RX_CONTINUE; 3243 3244 if (unlikely(!ieee80211_is_data_present(fc))) 3245 return RX_DROP_U_AMSDU_WITHOUT_DATA; 3246 3247 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3248 switch (rx->sdata->vif.type) { 3249 case NL80211_IFTYPE_AP_VLAN: 3250 if (!rx->sdata->u.vlan.sta) 3251 return RX_DROP_U_BAD_4ADDR; 3252 break; 3253 case NL80211_IFTYPE_STATION: 3254 if (!rx->sdata->u.mgd.use_4addr) 3255 return RX_DROP_U_BAD_4ADDR; 3256 break; 3257 case NL80211_IFTYPE_MESH_POINT: 3258 break; 3259 default: 3260 return RX_DROP_U_BAD_4ADDR; 3261 } 3262 } 3263 3264 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3265 return RX_DROP_U_BAD_AMSDU; 3266 3267 if (rx->key) { 3268 /* 3269 * We should not receive A-MSDUs on pre-HT connections, 3270 * and HT connections cannot use old ciphers. Thus drop 3271 * them, as in those cases we couldn't even have SPP 3272 * A-MSDUs or such. 3273 */ 3274 switch (rx->key->conf.cipher) { 3275 case WLAN_CIPHER_SUITE_WEP40: 3276 case WLAN_CIPHER_SUITE_WEP104: 3277 case WLAN_CIPHER_SUITE_TKIP: 3278 return RX_DROP_U_BAD_AMSDU_CIPHER; 3279 default: 3280 break; 3281 } 3282 } 3283 3284 return __ieee80211_rx_h_amsdu(rx, 0); 3285 } 3286 3287 static ieee80211_rx_result debug_noinline 3288 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3289 { 3290 struct ieee80211_sub_if_data *sdata = rx->sdata; 3291 struct ieee80211_local *local = rx->local; 3292 struct net_device *dev = sdata->dev; 3293 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3294 __le16 fc = hdr->frame_control; 3295 ieee80211_rx_result res; 3296 bool port_control; 3297 3298 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3299 return RX_CONTINUE; 3300 3301 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3302 return RX_DROP_U_NULL_DATA; 3303 3304 /* Send unexpected-4addr-frame event to hostapd */ 3305 if (ieee80211_has_a4(hdr->frame_control) && 3306 sdata->vif.type == NL80211_IFTYPE_AP) { 3307 if (rx->sta && 3308 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3309 cfg80211_rx_unexpected_4addr_frame( 3310 rx->sdata->dev, rx->sta->sta.addr, rx->link_id, 3311 GFP_ATOMIC); 3312 return RX_DROP_U_UNEXPECTED_4ADDR; 3313 } 3314 3315 res = __ieee80211_data_to_8023(rx, &port_control); 3316 if (unlikely(res != RX_CONTINUE)) 3317 return res; 3318 3319 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3320 if (res != RX_CONTINUE) 3321 return res; 3322 3323 if (!ieee80211_frame_allowed(rx, fc)) 3324 return RX_DROP_U_PORT_CONTROL; 3325 3326 /* directly handle TDLS channel switch requests/responses */ 3327 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3328 cpu_to_be16(ETH_P_TDLS))) { 3329 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3330 3331 if (pskb_may_pull(rx->skb, 3332 offsetof(struct ieee80211_tdls_data, u)) && 3333 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3334 tf->category == WLAN_CATEGORY_TDLS && 3335 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3336 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3337 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3338 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3339 rx->sta, rx->skb); 3340 return RX_QUEUED; 3341 } 3342 } 3343 3344 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3345 unlikely(port_control) && sdata->bss) { 3346 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3347 u.ap); 3348 dev = sdata->dev; 3349 rx->sdata = sdata; 3350 } 3351 3352 rx->skb->dev = dev; 3353 3354 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3355 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3356 !is_multicast_ether_addr( 3357 ((struct ethhdr *)rx->skb->data)->h_dest) && 3358 (!local->scanning && 3359 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3360 mod_timer(&local->dynamic_ps_timer, jiffies + 3361 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3362 3363 ieee80211_deliver_skb(rx); 3364 3365 return RX_QUEUED; 3366 } 3367 3368 static ieee80211_rx_result debug_noinline 3369 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3370 { 3371 struct sk_buff *skb = rx->skb; 3372 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3373 struct tid_ampdu_rx *tid_agg_rx; 3374 u16 start_seq_num; 3375 u16 tid; 3376 3377 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3378 return RX_CONTINUE; 3379 3380 if (ieee80211_is_back_req(bar->frame_control)) { 3381 struct { 3382 __le16 control, start_seq_num; 3383 } __packed bar_data; 3384 struct ieee80211_event event = { 3385 .type = BAR_RX_EVENT, 3386 }; 3387 3388 if (!rx->sta) 3389 return RX_DROP_U_UNKNOWN_STA; 3390 3391 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3392 &bar_data, sizeof(bar_data))) 3393 return RX_DROP_U_RUNT_BAR; 3394 3395 tid = le16_to_cpu(bar_data.control) >> 12; 3396 3397 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3398 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3399 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3400 WLAN_BACK_RECIPIENT, 3401 WLAN_REASON_QSTA_REQUIRE_SETUP, 3402 ieee80211_s1g_use_ndp_ba(rx->sdata, 3403 rx->sta)); 3404 3405 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3406 if (!tid_agg_rx) 3407 return RX_DROP_U_BAR_OUTSIDE_SESSION; 3408 3409 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3410 event.u.ba.tid = tid; 3411 event.u.ba.ssn = start_seq_num; 3412 event.u.ba.sta = &rx->sta->sta; 3413 3414 /* reset session timer */ 3415 if (tid_agg_rx->timeout) 3416 mod_timer(&tid_agg_rx->session_timer, 3417 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3418 3419 spin_lock(&tid_agg_rx->reorder_lock); 3420 /* release stored frames up to start of BAR */ 3421 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3422 start_seq_num, frames); 3423 spin_unlock(&tid_agg_rx->reorder_lock); 3424 3425 drv_event_callback(rx->local, rx->sdata, &event); 3426 3427 kfree_skb(skb); 3428 return RX_QUEUED; 3429 } 3430 3431 return RX_DROP_U_CTRL_FRAME; 3432 } 3433 3434 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3435 struct ieee80211_mgmt *mgmt, 3436 size_t len) 3437 { 3438 struct ieee80211_local *local = sdata->local; 3439 struct sk_buff *skb; 3440 struct ieee80211_mgmt *resp; 3441 3442 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3443 /* Not to own unicast address */ 3444 return; 3445 } 3446 3447 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3448 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3449 /* Not from the current AP or not associated yet. */ 3450 return; 3451 } 3452 3453 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) { 3454 /* Too short SA Query request frame */ 3455 return; 3456 } 3457 3458 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3459 if (skb == NULL) 3460 return; 3461 3462 skb_reserve(skb, local->hw.extra_tx_headroom); 3463 resp = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(sa_query)); 3464 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3465 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3466 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3467 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3468 IEEE80211_STYPE_ACTION); 3469 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3470 resp->u.action.action_code = WLAN_ACTION_SA_QUERY_RESPONSE; 3471 memcpy(resp->u.action.sa_query.trans_id, 3472 mgmt->u.action.sa_query.trans_id, 3473 WLAN_SA_QUERY_TR_ID_LEN); 3474 3475 ieee80211_tx_skb(sdata, skb); 3476 } 3477 3478 static void 3479 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3480 { 3481 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3482 struct ieee80211_bss_conf *bss_conf; 3483 const struct element *ie; 3484 size_t baselen; 3485 3486 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3487 NL80211_EXT_FEATURE_BSS_COLOR)) 3488 return; 3489 3490 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3491 return; 3492 3493 bss_conf = rx->link->conf; 3494 if (bss_conf->csa_active || bss_conf->color_change_active || 3495 !bss_conf->he_bss_color.enabled) 3496 return; 3497 3498 baselen = mgmt->u.beacon.variable - rx->skb->data; 3499 if (baselen > rx->skb->len) 3500 return; 3501 3502 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3503 mgmt->u.beacon.variable, 3504 rx->skb->len - baselen); 3505 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3506 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3507 const struct ieee80211_he_operation *he_oper; 3508 u8 color; 3509 3510 he_oper = (void *)(ie->data + 1); 3511 if (le32_get_bits(he_oper->he_oper_params, 3512 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3513 return; 3514 3515 color = le32_get_bits(he_oper->he_oper_params, 3516 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3517 if (color == bss_conf->he_bss_color.color) 3518 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3519 BIT_ULL(color), 3520 bss_conf->link_id); 3521 } 3522 } 3523 3524 static ieee80211_rx_result debug_noinline 3525 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3526 { 3527 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3528 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3529 3530 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3531 return RX_CONTINUE; 3532 3533 /* 3534 * From here on, look only at management frames. 3535 * Data and control frames are already handled, 3536 * and unknown (reserved) frames are useless. 3537 */ 3538 if (rx->skb->len < 24) 3539 return RX_DROP_U_RUNT_MGMT; 3540 3541 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3542 return RX_DROP_U_EXPECTED_MGMT; 3543 3544 /* drop too small action frames */ 3545 if (ieee80211_is_action(mgmt->frame_control) && 3546 rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category)) 3547 return RX_DROP_U_RUNT_ACTION; 3548 3549 /* Drop non-broadcast Beacon frames */ 3550 if (ieee80211_is_beacon(mgmt->frame_control) && 3551 !is_broadcast_ether_addr(mgmt->da)) 3552 return RX_DROP_U_NONBCAST_BEACON; 3553 3554 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3555 ieee80211_is_beacon(mgmt->frame_control) && 3556 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3557 int sig = 0; 3558 3559 /* sw bss color collision detection */ 3560 ieee80211_rx_check_bss_color_collision(rx); 3561 3562 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3563 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3564 sig = status->signal; 3565 3566 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3567 rx->skb->data, rx->skb->len, 3568 ieee80211_rx_status_to_khz(status), 3569 sig); 3570 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3571 } 3572 3573 return ieee80211_drop_unencrypted_mgmt(rx); 3574 } 3575 3576 static bool 3577 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3578 { 3579 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3580 struct ieee80211_sub_if_data *sdata = rx->sdata; 3581 3582 /* TWT actions are only supported in AP for the moment */ 3583 if (sdata->vif.type != NL80211_IFTYPE_AP) 3584 return false; 3585 3586 if (!rx->local->ops->add_twt_setup) 3587 return false; 3588 3589 if (!sdata->vif.bss_conf.twt_responder) 3590 return false; 3591 3592 if (!rx->sta) 3593 return false; 3594 3595 switch (mgmt->u.action.action_code) { 3596 case WLAN_S1G_TWT_SETUP: { 3597 struct ieee80211_twt_setup *twt; 3598 3599 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3600 sizeof(struct ieee80211_twt_setup) + 3601 2 /* TWT req_type agrt */) 3602 break; 3603 3604 twt = (void *)mgmt->u.action.s1g.variable; 3605 if (twt->element_id != WLAN_EID_S1G_TWT) 3606 break; 3607 3608 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3609 3 + /* token + tlv */ 3610 twt->length) 3611 break; 3612 3613 return true; /* queue the frame */ 3614 } 3615 case WLAN_S1G_TWT_TEARDOWN: 3616 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 1) 3617 break; 3618 3619 return true; /* queue the frame */ 3620 default: 3621 break; 3622 } 3623 3624 return false; 3625 } 3626 3627 static ieee80211_rx_result debug_noinline 3628 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3629 { 3630 struct ieee80211_local *local = rx->local; 3631 struct ieee80211_sub_if_data *sdata = rx->sdata; 3632 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3633 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3634 int len = rx->skb->len; 3635 3636 if (!ieee80211_is_action(mgmt->frame_control)) 3637 return RX_CONTINUE; 3638 3639 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3640 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3641 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3642 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3643 3644 switch (mgmt->u.action.category) { 3645 case WLAN_CATEGORY_HT: 3646 /* reject HT action frames from stations not supporting HT 3647 * or not HE Capable 3648 */ 3649 if (!rx->link_sta->pub->ht_cap.ht_supported && 3650 !rx->link_sta->pub->he_cap.has_he) 3651 goto invalid; 3652 3653 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3654 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3655 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3656 sdata->vif.type != NL80211_IFTYPE_AP && 3657 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3658 break; 3659 3660 /* verify action & smps_control/chanwidth are present */ 3661 if (len < IEEE80211_MIN_ACTION_SIZE(ht_smps)) 3662 goto invalid; 3663 3664 switch (mgmt->u.action.action_code) { 3665 case WLAN_HT_ACTION_SMPS: { 3666 struct ieee80211_supported_band *sband; 3667 enum ieee80211_smps_mode smps_mode; 3668 struct sta_opmode_info sta_opmode = {}; 3669 3670 if (sdata->vif.type != NL80211_IFTYPE_AP && 3671 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3672 goto handled; 3673 3674 /* convert to HT capability */ 3675 switch (mgmt->u.action.ht_smps.smps_control) { 3676 case WLAN_HT_SMPS_CONTROL_DISABLED: 3677 smps_mode = IEEE80211_SMPS_OFF; 3678 break; 3679 case WLAN_HT_SMPS_CONTROL_STATIC: 3680 smps_mode = IEEE80211_SMPS_STATIC; 3681 break; 3682 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3683 smps_mode = IEEE80211_SMPS_DYNAMIC; 3684 break; 3685 default: 3686 goto invalid; 3687 } 3688 3689 /* if no change do nothing */ 3690 if (rx->link_sta->pub->smps_mode == smps_mode) 3691 goto handled; 3692 rx->link_sta->pub->smps_mode = smps_mode; 3693 sta_opmode.smps_mode = 3694 ieee80211_smps_mode_to_smps_mode(smps_mode); 3695 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3696 3697 sband = rx->local->hw.wiphy->bands[status->band]; 3698 3699 rate_control_rate_update(local, sband, rx->link_sta, 3700 IEEE80211_RC_SMPS_CHANGED); 3701 cfg80211_sta_opmode_change_notify(sdata->dev, 3702 rx->sta->addr, 3703 &sta_opmode, 3704 GFP_ATOMIC); 3705 goto handled; 3706 } 3707 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3708 u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth; 3709 3710 if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ && 3711 chanwidth != IEEE80211_HT_CHANWIDTH_ANY) 3712 goto invalid; 3713 3714 /* If it doesn't support 40 MHz it can't change ... */ 3715 if (!(rx->link_sta->pub->ht_cap.cap & 3716 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3717 goto handled; 3718 3719 goto queue; 3720 } 3721 default: 3722 goto invalid; 3723 } 3724 3725 break; 3726 case WLAN_CATEGORY_PUBLIC: 3727 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3728 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3729 goto invalid; 3730 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3731 break; 3732 if (!rx->sta) 3733 break; 3734 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3735 break; 3736 if (mgmt->u.action.action_code != 3737 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3738 break; 3739 if (len < IEEE80211_MIN_ACTION_SIZE(ext_chan_switch)) 3740 goto invalid; 3741 goto queue; 3742 case WLAN_CATEGORY_VHT: 3743 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3744 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3745 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3746 sdata->vif.type != NL80211_IFTYPE_AP && 3747 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3748 break; 3749 3750 /* verify action code is present */ 3751 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3752 goto invalid; 3753 3754 switch (mgmt->u.action.action_code) { 3755 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3756 /* verify opmode is present */ 3757 if (len < IEEE80211_MIN_ACTION_SIZE(vht_opmode_notif)) 3758 goto invalid; 3759 goto queue; 3760 } 3761 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3762 if (len < IEEE80211_MIN_ACTION_SIZE(vht_group_notif)) 3763 goto invalid; 3764 goto queue; 3765 } 3766 default: 3767 break; 3768 } 3769 break; 3770 case WLAN_CATEGORY_BACK: 3771 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3772 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3773 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3774 sdata->vif.type != NL80211_IFTYPE_AP && 3775 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3776 sdata->vif.type != NL80211_IFTYPE_NAN_DATA) 3777 break; 3778 3779 /* verify action_code is present */ 3780 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3781 break; 3782 3783 switch (mgmt->u.action.action_code) { 3784 case WLAN_ACTION_ADDBA_REQ: 3785 case WLAN_ACTION_NDP_ADDBA_REQ: 3786 if (len < IEEE80211_MIN_ACTION_SIZE(addba_req)) 3787 goto invalid; 3788 break; 3789 case WLAN_ACTION_ADDBA_RESP: 3790 case WLAN_ACTION_NDP_ADDBA_RESP: 3791 if (len < IEEE80211_MIN_ACTION_SIZE(addba_resp)) 3792 goto invalid; 3793 break; 3794 case WLAN_ACTION_DELBA: 3795 case WLAN_ACTION_NDP_DELBA: 3796 if (len < IEEE80211_MIN_ACTION_SIZE(delba)) 3797 goto invalid; 3798 break; 3799 default: 3800 goto invalid; 3801 } 3802 3803 goto queue; 3804 case WLAN_CATEGORY_SPECTRUM_MGMT: 3805 /* verify action_code is present */ 3806 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3807 break; 3808 3809 switch (mgmt->u.action.action_code) { 3810 case WLAN_ACTION_SPCT_MSR_REQ: 3811 if (status->band != NL80211_BAND_5GHZ) 3812 break; 3813 3814 if (len < IEEE80211_MIN_ACTION_SIZE(measurement)) 3815 break; 3816 3817 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3818 break; 3819 3820 ieee80211_process_measurement_req(sdata, mgmt, len); 3821 goto handled; 3822 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3823 u8 *bssid; 3824 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 3825 break; 3826 3827 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3828 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3829 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3830 break; 3831 3832 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3833 bssid = sdata->deflink.u.mgd.bssid; 3834 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3835 bssid = sdata->u.ibss.bssid; 3836 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3837 bssid = mgmt->sa; 3838 else 3839 break; 3840 3841 if (!ether_addr_equal(mgmt->bssid, bssid)) 3842 break; 3843 3844 goto queue; 3845 } 3846 } 3847 break; 3848 case WLAN_CATEGORY_SELF_PROTECTED: 3849 if (len < IEEE80211_MIN_ACTION_SIZE(self_prot)) 3850 break; 3851 3852 switch (mgmt->u.action.action_code) { 3853 case WLAN_SP_MESH_PEERING_OPEN: 3854 case WLAN_SP_MESH_PEERING_CLOSE: 3855 case WLAN_SP_MESH_PEERING_CONFIRM: 3856 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3857 goto invalid; 3858 if (sdata->u.mesh.user_mpm) 3859 /* userspace handles this frame */ 3860 break; 3861 goto queue; 3862 case WLAN_SP_MGK_INFORM: 3863 case WLAN_SP_MGK_ACK: 3864 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3865 goto invalid; 3866 break; 3867 } 3868 break; 3869 case WLAN_CATEGORY_MESH_ACTION: 3870 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3871 break; 3872 3873 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3874 break; 3875 if (mesh_action_is_path_sel(mgmt) && 3876 !mesh_path_sel_is_hwmp(sdata)) 3877 break; 3878 goto queue; 3879 case WLAN_CATEGORY_S1G: 3880 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3881 break; 3882 3883 switch (mgmt->u.action.action_code) { 3884 case WLAN_S1G_TWT_SETUP: 3885 case WLAN_S1G_TWT_TEARDOWN: 3886 if (ieee80211_process_rx_twt_action(rx)) 3887 goto queue; 3888 break; 3889 default: 3890 break; 3891 } 3892 break; 3893 case WLAN_CATEGORY_PROTECTED_EHT: 3894 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3895 break; 3896 3897 switch (mgmt->u.action.action_code) { 3898 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3899 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3900 break; 3901 3902 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_req)) 3903 goto invalid; 3904 goto queue; 3905 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3906 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3907 break; 3908 3909 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_res)) 3910 goto invalid; 3911 goto queue; 3912 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3913 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3914 break; 3915 3916 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_tear_down)) 3917 goto invalid; 3918 goto queue; 3919 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3920 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3921 break; 3922 3923 /* The reconfiguration response action frame must 3924 * least one 'Status Duple' entry (3 octets) 3925 */ 3926 if (len < IEEE80211_MIN_ACTION_SIZE(ml_reconf_resp) + 3) 3927 goto invalid; 3928 goto queue; 3929 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3930 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3931 break; 3932 3933 if (len < IEEE80211_MIN_ACTION_SIZE(epcs) + 3934 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3935 goto invalid; 3936 goto queue; 3937 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3938 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3939 break; 3940 3941 if (len < IEEE80211_MIN_ACTION_SIZE(epcs)) 3942 goto invalid; 3943 goto queue; 3944 case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF: 3945 if (sdata->vif.type != NL80211_IFTYPE_AP) 3946 break; 3947 3948 if (len < IEEE80211_MIN_ACTION_SIZE(eml_omn)) 3949 goto invalid; 3950 goto queue; 3951 default: 3952 break; 3953 } 3954 break; 3955 case WLAN_CATEGORY_PROTECTED_UHR: 3956 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3957 break; 3958 3959 switch (mgmt->u.action.action_code) { 3960 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_REQUEST: 3961 if (sdata->vif.type != NL80211_IFTYPE_AP) 3962 break; 3963 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_req)) 3964 goto invalid; 3965 if (mgmt->u.action.uhr_link_reconf_req.type != 3966 IEEE80211_UHR_LINK_RECONFIG_REQUEST_OMP_REQUEST) 3967 break; 3968 goto queue; 3969 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_NOTIFY: 3970 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3971 break; 3972 3973 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_notif)) 3974 goto invalid; 3975 goto queue; 3976 } 3977 break; 3978 } 3979 3980 return RX_CONTINUE; 3981 3982 invalid: 3983 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3984 /* will return in the next handlers */ 3985 return RX_CONTINUE; 3986 3987 handled: 3988 if (rx->sta) 3989 rx->link_sta->rx_stats.packets++; 3990 dev_kfree_skb(rx->skb); 3991 return RX_QUEUED; 3992 3993 queue: 3994 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3995 return RX_QUEUED; 3996 } 3997 3998 static ieee80211_rx_result debug_noinline 3999 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 4000 { 4001 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4002 struct cfg80211_rx_info info = { 4003 .freq = ieee80211_rx_status_to_khz(status), 4004 .buf = rx->skb->data, 4005 .len = rx->skb->len, 4006 .link_id = rx->link_id, 4007 .have_link_id = rx->link_id >= 0, 4008 }; 4009 4010 /* skip known-bad action frames and return them in the next handler */ 4011 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 4012 return RX_CONTINUE; 4013 4014 /* 4015 * Getting here means the kernel doesn't know how to handle 4016 * it, but maybe userspace does ... include returned frames 4017 * so userspace can register for those to know whether ones 4018 * it transmitted were processed or returned. 4019 */ 4020 4021 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 4022 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 4023 info.sig_dbm = status->signal; 4024 4025 if (ieee80211_is_timing_measurement(rx->skb) || 4026 ieee80211_is_ftm(rx->skb)) { 4027 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 4028 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 4029 } 4030 4031 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 4032 if (rx->sta) 4033 rx->link_sta->rx_stats.packets++; 4034 dev_kfree_skb(rx->skb); 4035 return RX_QUEUED; 4036 } 4037 4038 return RX_CONTINUE; 4039 } 4040 4041 static ieee80211_rx_result debug_noinline 4042 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 4043 { 4044 struct ieee80211_sub_if_data *sdata = rx->sdata; 4045 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4046 int len = rx->skb->len; 4047 4048 if (!ieee80211_is_action(mgmt->frame_control)) 4049 return RX_CONTINUE; 4050 4051 switch (mgmt->u.action.category) { 4052 case WLAN_CATEGORY_SA_QUERY: 4053 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) 4054 break; 4055 4056 switch (mgmt->u.action.action_code) { 4057 case WLAN_ACTION_SA_QUERY_REQUEST: 4058 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4059 break; 4060 ieee80211_process_sa_query_req(sdata, mgmt, len); 4061 goto handled; 4062 } 4063 break; 4064 } 4065 4066 return RX_CONTINUE; 4067 4068 handled: 4069 if (rx->sta) 4070 rx->link_sta->rx_stats.packets++; 4071 dev_kfree_skb(rx->skb); 4072 return RX_QUEUED; 4073 } 4074 4075 static ieee80211_rx_result debug_noinline 4076 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 4077 { 4078 struct ieee80211_local *local = rx->local; 4079 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4080 struct sk_buff *nskb; 4081 struct ieee80211_sub_if_data *sdata = rx->sdata; 4082 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4083 4084 if (!ieee80211_is_action(mgmt->frame_control)) 4085 return RX_CONTINUE; 4086 4087 /* 4088 * For AP mode, hostapd is responsible for handling any action 4089 * frames that we didn't handle, including returning unknown 4090 * ones. For all other modes we will return them to the sender, 4091 * setting the 0x80 bit in the action category, as required by 4092 * 802.11-2012 9.24.4. 4093 * Newer versions of hostapd use the management frame registration 4094 * mechanisms and old cooked monitor interface is no longer supported. 4095 */ 4096 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 4097 (sdata->vif.type == NL80211_IFTYPE_AP || 4098 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 4099 return RX_DROP_U_MALFORMED_ACTION; 4100 4101 if (is_multicast_ether_addr(mgmt->da)) 4102 return RX_DROP_U_UNKNOWN_MCAST_ACTION; 4103 4104 /* do not return rejected action frames */ 4105 if (mgmt->u.action.category & 0x80) 4106 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 4107 4108 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 4109 GFP_ATOMIC); 4110 if (nskb) { 4111 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 4112 4113 nmgmt->u.action.category |= 0x80; 4114 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 4115 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 4116 4117 memset(nskb->cb, 0, sizeof(nskb->cb)); 4118 4119 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 4120 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 4121 4122 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 4123 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 4124 IEEE80211_TX_CTL_NO_CCK_RATE; 4125 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 4126 info->hw_queue = 4127 local->hw.offchannel_tx_hw_queue; 4128 } 4129 4130 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 4131 status->band); 4132 } 4133 4134 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 4135 } 4136 4137 static ieee80211_rx_result debug_noinline 4138 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 4139 { 4140 struct ieee80211_sub_if_data *sdata = rx->sdata; 4141 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4142 4143 if (!ieee80211_is_ext(hdr->frame_control)) 4144 return RX_CONTINUE; 4145 4146 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4147 return RX_DROP_U_UNEXPECTED_EXT_FRAME; 4148 4149 /* for now only beacons are ext, so queue them */ 4150 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4151 4152 return RX_QUEUED; 4153 } 4154 4155 static ieee80211_rx_result debug_noinline 4156 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4157 { 4158 struct ieee80211_sub_if_data *sdata = rx->sdata; 4159 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4160 __le16 stype; 4161 4162 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4163 4164 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4165 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4166 sdata->vif.type != NL80211_IFTYPE_OCB && 4167 sdata->vif.type != NL80211_IFTYPE_STATION) 4168 return RX_DROP_U_UNHANDLED_MGMT; 4169 4170 switch (stype) { 4171 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4172 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4173 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4174 /* process for all: mesh, mlme, ibss */ 4175 break; 4176 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4177 if (is_multicast_ether_addr(mgmt->da) && 4178 !is_broadcast_ether_addr(mgmt->da)) 4179 return RX_DROP_U_MCAST_DEAUTH; 4180 4181 /* process only for station/IBSS */ 4182 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4183 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4184 return RX_DROP_U_UNHANDLED_DEAUTH; 4185 break; 4186 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4187 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4188 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4189 if (is_multicast_ether_addr(mgmt->da) && 4190 !is_broadcast_ether_addr(mgmt->da)) 4191 return RX_DROP_U_MCAST_DISASSOC; 4192 4193 /* process only for station */ 4194 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4195 return RX_DROP_U_UNHANDLED_DISASSOC; 4196 break; 4197 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4198 /* process only for ibss and mesh */ 4199 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4200 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4201 return RX_DROP_U_UNHANDLED_PREQ; 4202 break; 4203 default: 4204 return RX_DROP_U_UNHANDLED_MGMT_STYPE; 4205 } 4206 4207 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4208 4209 return RX_QUEUED; 4210 } 4211 4212 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4213 ieee80211_rx_result res) 4214 { 4215 if (res == RX_QUEUED) { 4216 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4217 return; 4218 } 4219 4220 if (res != RX_CONTINUE) { 4221 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4222 if (rx->sta) 4223 rx->link_sta->rx_stats.dropped++; 4224 } 4225 4226 kfree_skb_reason(rx->skb, (__force u32)res); 4227 } 4228 4229 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4230 struct sk_buff_head *frames) 4231 { 4232 ieee80211_rx_result res; 4233 struct sk_buff *skb; 4234 4235 #define CALL_RXH(rxh) \ 4236 do { \ 4237 res = rxh(rx); \ 4238 if (res != RX_CONTINUE) \ 4239 goto rxh_next; \ 4240 } while (0) 4241 4242 /* Lock here to avoid hitting all of the data used in the RX 4243 * path (e.g. key data, station data, ...) concurrently when 4244 * a frame is released from the reorder buffer due to timeout 4245 * from the timer, potentially concurrently with RX from the 4246 * driver. 4247 */ 4248 spin_lock_bh(&rx->local->rx_path_lock); 4249 4250 while ((skb = __skb_dequeue(frames))) { 4251 /* 4252 * all the other fields are valid across frames 4253 * that belong to an aMPDU since they are on the 4254 * same TID from the same station 4255 */ 4256 rx->skb = skb; 4257 4258 if (WARN_ON_ONCE(!rx->link)) { 4259 res = RX_DROP_U_NO_LINK; 4260 goto rxh_next; 4261 } 4262 4263 CALL_RXH(ieee80211_rx_h_check_more_data); 4264 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4265 CALL_RXH(ieee80211_rx_h_sta_process); 4266 CALL_RXH(ieee80211_rx_h_decrypt); 4267 CALL_RXH(ieee80211_rx_h_defragment); 4268 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4269 /* must be after MMIC verify so header is counted in MPDU mic */ 4270 CALL_RXH(ieee80211_rx_h_amsdu); 4271 CALL_RXH(ieee80211_rx_h_data); 4272 4273 /* special treatment -- needs the queue */ 4274 res = ieee80211_rx_h_ctrl(rx, frames); 4275 if (res != RX_CONTINUE) 4276 goto rxh_next; 4277 4278 CALL_RXH(ieee80211_rx_h_mgmt_check); 4279 CALL_RXH(ieee80211_rx_h_action); 4280 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4281 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4282 CALL_RXH(ieee80211_rx_h_action_return); 4283 CALL_RXH(ieee80211_rx_h_ext); 4284 CALL_RXH(ieee80211_rx_h_mgmt); 4285 4286 rxh_next: 4287 ieee80211_rx_handlers_result(rx, res); 4288 4289 #undef CALL_RXH 4290 } 4291 4292 spin_unlock_bh(&rx->local->rx_path_lock); 4293 } 4294 4295 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4296 { 4297 struct sk_buff_head reorder_release; 4298 ieee80211_rx_result res; 4299 4300 __skb_queue_head_init(&reorder_release); 4301 4302 #define CALL_RXH(rxh) \ 4303 do { \ 4304 res = rxh(rx); \ 4305 if (res != RX_CONTINUE) \ 4306 goto rxh_next; \ 4307 } while (0) 4308 4309 CALL_RXH(ieee80211_rx_h_check_dup); 4310 CALL_RXH(ieee80211_rx_h_check); 4311 4312 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4313 4314 ieee80211_rx_handlers(rx, &reorder_release); 4315 return; 4316 4317 rxh_next: 4318 ieee80211_rx_handlers_result(rx, res); 4319 4320 #undef CALL_RXH 4321 } 4322 4323 static bool 4324 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4325 { 4326 return !!(sta->valid_links & BIT(link_id)); 4327 } 4328 4329 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4330 u8 link_id) 4331 { 4332 rx->link_id = link_id; 4333 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4334 4335 if (!rx->sta) 4336 return rx->link; 4337 4338 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4339 return false; 4340 4341 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4342 4343 return rx->link && rx->link_sta; 4344 } 4345 4346 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4347 struct sta_info *sta, int link_id) 4348 { 4349 rx->link_id = link_id; 4350 rx->sta = sta; 4351 4352 if (sta) { 4353 rx->local = sta->sdata->local; 4354 if (!rx->sdata) 4355 rx->sdata = sta->sdata; 4356 rx->link_sta = &sta->deflink; 4357 } else { 4358 rx->link_sta = NULL; 4359 } 4360 4361 if (link_id < 0) { 4362 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4363 sta && !sta->sta.valid_links) 4364 rx->link = 4365 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4366 else 4367 rx->link = &rx->sdata->deflink; 4368 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4369 return false; 4370 } 4371 4372 return true; 4373 } 4374 4375 /* 4376 * This function makes calls into the RX path, therefore 4377 * it has to be invoked under RCU read lock. 4378 */ 4379 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4380 { 4381 struct sk_buff_head frames; 4382 struct ieee80211_rx_data rx = { 4383 /* This is OK -- must be QoS data frame */ 4384 .security_idx = tid, 4385 .seqno_idx = tid, 4386 }; 4387 struct tid_ampdu_rx *tid_agg_rx; 4388 int link_id = -1; 4389 4390 /* FIXME: statistics won't be right with this */ 4391 if (sta->sta.valid_links) 4392 link_id = ffs(sta->sta.valid_links) - 1; 4393 4394 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4395 return; 4396 4397 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4398 if (!tid_agg_rx) 4399 return; 4400 4401 __skb_queue_head_init(&frames); 4402 4403 spin_lock(&tid_agg_rx->reorder_lock); 4404 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4405 spin_unlock(&tid_agg_rx->reorder_lock); 4406 4407 if (!skb_queue_empty(&frames)) { 4408 struct ieee80211_event event = { 4409 .type = BA_FRAME_TIMEOUT, 4410 .u.ba.tid = tid, 4411 .u.ba.sta = &sta->sta, 4412 }; 4413 drv_event_callback(rx.local, rx.sdata, &event); 4414 } 4415 4416 ieee80211_rx_handlers(&rx, &frames); 4417 } 4418 4419 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4420 u16 ssn, u64 filtered, 4421 u16 received_mpdus) 4422 { 4423 struct ieee80211_local *local; 4424 struct sta_info *sta; 4425 struct tid_ampdu_rx *tid_agg_rx; 4426 struct sk_buff_head frames; 4427 struct ieee80211_rx_data rx = { 4428 /* This is OK -- must be QoS data frame */ 4429 .security_idx = tid, 4430 .seqno_idx = tid, 4431 }; 4432 int i, diff; 4433 4434 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4435 return; 4436 4437 __skb_queue_head_init(&frames); 4438 4439 sta = container_of(pubsta, struct sta_info, sta); 4440 4441 local = sta->sdata->local; 4442 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4443 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4444 local->hw.max_rx_aggregation_subframes); 4445 4446 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4447 return; 4448 4449 rcu_read_lock(); 4450 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4451 if (!tid_agg_rx) 4452 goto out; 4453 4454 spin_lock_bh(&tid_agg_rx->reorder_lock); 4455 4456 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4457 int release; 4458 4459 /* release all frames in the reorder buffer */ 4460 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4461 IEEE80211_SN_MODULO; 4462 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4463 release, &frames); 4464 /* update ssn to match received ssn */ 4465 tid_agg_rx->head_seq_num = ssn; 4466 } else { 4467 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4468 &frames); 4469 } 4470 4471 /* handle the case that received ssn is behind the mac ssn. 4472 * it can be tid_agg_rx->buf_size behind and still be valid */ 4473 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4474 if (diff >= tid_agg_rx->buf_size) { 4475 tid_agg_rx->reorder_buf_filtered = 0; 4476 goto release; 4477 } 4478 filtered = filtered >> diff; 4479 ssn += diff; 4480 4481 /* update bitmap */ 4482 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4483 int index = (ssn + i) % tid_agg_rx->buf_size; 4484 4485 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4486 if (filtered & BIT_ULL(i)) 4487 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4488 } 4489 4490 /* now process also frames that the filter marking released */ 4491 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4492 4493 release: 4494 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4495 4496 ieee80211_rx_handlers(&rx, &frames); 4497 4498 out: 4499 rcu_read_unlock(); 4500 } 4501 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4502 4503 /* main receive path */ 4504 4505 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4506 { 4507 return ether_addr_equal(raddr, addr) || 4508 is_broadcast_ether_addr(raddr); 4509 } 4510 4511 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4512 { 4513 struct ieee80211_sub_if_data *sdata = rx->sdata; 4514 struct sk_buff *skb = rx->skb; 4515 struct ieee80211_hdr *hdr = (void *)skb->data; 4516 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4517 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4518 bool multicast; 4519 static const u8 nan_network_id[ETH_ALEN] __aligned(2) = { 4520 0x51, 0x6F, 0x9A, 0x01, 0x00, 0x00 4521 }; 4522 4523 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 4524 return sdata->vif.type == NL80211_IFTYPE_STATION && bssid; 4525 4526 multicast = is_multicast_ether_addr(hdr->addr1); 4527 4528 switch (sdata->vif.type) { 4529 case NL80211_IFTYPE_STATION: 4530 if (!bssid && !sdata->u.mgd.use_4addr) 4531 return false; 4532 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4533 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4534 return false; 4535 if (multicast) 4536 return true; 4537 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4538 case NL80211_IFTYPE_ADHOC: 4539 if (!bssid) 4540 return false; 4541 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4542 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4543 !is_valid_ether_addr(hdr->addr2)) 4544 return false; 4545 if (ieee80211_is_beacon(hdr->frame_control)) 4546 return true; 4547 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4548 return false; 4549 if (!multicast && 4550 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4551 return false; 4552 if (!rx->sta) { 4553 int rate_idx; 4554 if (status->encoding != RX_ENC_LEGACY) 4555 rate_idx = 0; /* TODO: HT/VHT rates */ 4556 else 4557 rate_idx = status->rate_idx; 4558 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4559 BIT(rate_idx)); 4560 } 4561 return true; 4562 case NL80211_IFTYPE_OCB: 4563 if (!bssid) 4564 return false; 4565 if (!ieee80211_is_data_present(hdr->frame_control)) 4566 return false; 4567 if (!is_broadcast_ether_addr(bssid)) 4568 return false; 4569 if (!multicast && 4570 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4571 return false; 4572 /* reject invalid/our STA address */ 4573 if (!is_valid_ether_addr(hdr->addr2) || 4574 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4575 return false; 4576 if (!rx->sta) { 4577 int rate_idx; 4578 if (status->encoding != RX_ENC_LEGACY) 4579 rate_idx = 0; /* TODO: HT rates */ 4580 else 4581 rate_idx = status->rate_idx; 4582 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4583 BIT(rate_idx)); 4584 } 4585 return true; 4586 case NL80211_IFTYPE_MESH_POINT: 4587 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4588 return false; 4589 if (multicast) 4590 return true; 4591 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4592 case NL80211_IFTYPE_AP_VLAN: 4593 case NL80211_IFTYPE_AP: 4594 if (!bssid) 4595 return ieee80211_is_our_addr(sdata, hdr->addr1, 4596 &rx->link_id); 4597 4598 if (!is_broadcast_ether_addr(bssid) && 4599 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4600 /* 4601 * Accept public action frames even when the 4602 * BSSID doesn't match, this is used for P2P 4603 * and location updates. Note that mac80211 4604 * itself never looks at these frames. 4605 */ 4606 if (!multicast && 4607 !ieee80211_is_our_addr(sdata, hdr->addr1, 4608 &rx->link_id)) 4609 return false; 4610 if (ieee80211_is_public_action(hdr, skb->len)) 4611 return true; 4612 return ieee80211_is_beacon(hdr->frame_control); 4613 } 4614 4615 if (!ieee80211_has_tods(hdr->frame_control)) { 4616 /* ignore data frames to TDLS-peers */ 4617 if (ieee80211_is_data(hdr->frame_control)) 4618 return false; 4619 /* ignore action frames to TDLS-peers */ 4620 if (ieee80211_is_action(hdr->frame_control) && 4621 !is_broadcast_ether_addr(bssid) && 4622 !ether_addr_equal(bssid, hdr->addr1)) 4623 return false; 4624 } 4625 4626 /* 4627 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4628 * the BSSID - we've checked that already but may have accepted 4629 * the wildcard (ff:ff:ff:ff:ff:ff). 4630 * 4631 * It also says: 4632 * The BSSID of the Data frame is determined as follows: 4633 * a) If the STA is contained within an AP or is associated 4634 * with an AP, the BSSID is the address currently in use 4635 * by the STA contained in the AP. 4636 * 4637 * So we should not accept data frames with an address that's 4638 * multicast. 4639 * 4640 * Accepting it also opens a security problem because stations 4641 * could encrypt it with the GTK and inject traffic that way. 4642 */ 4643 if (ieee80211_is_data(hdr->frame_control) && multicast) 4644 return false; 4645 4646 return true; 4647 case NL80211_IFTYPE_P2P_DEVICE: 4648 return ieee80211_is_public_action(hdr, skb->len) || 4649 ieee80211_is_probe_req(hdr->frame_control) || 4650 ieee80211_is_probe_resp(hdr->frame_control) || 4651 ieee80211_is_beacon(hdr->frame_control) || 4652 (ieee80211_is_auth(hdr->frame_control) && 4653 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4654 case NL80211_IFTYPE_NAN: 4655 if (ieee80211_has_tods(hdr->frame_control) || 4656 ieee80211_has_fromds(hdr->frame_control)) 4657 return false; 4658 4659 /* 4660 * Accept only frames that are addressed to the NAN cluster 4661 * (based on the Cluster ID). From these frames, accept only 4662 * - public action frames, 4663 * - authentication frames to the local address, and 4664 * - robust management frames except disassoc. 4665 */ 4666 if (!ether_addr_equal(sdata->u.nan.conf.cluster_id, hdr->addr3)) 4667 return false; 4668 if (ieee80211_is_public_action(hdr, skb->len)) 4669 return true; 4670 if (ieee80211_is_auth(hdr->frame_control) && 4671 ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4672 return true; 4673 if (!ieee80211_is_disassoc(hdr->frame_control) && 4674 ieee80211_is_robust_mgmt_frame(skb)) 4675 return true; 4676 return false; 4677 case NL80211_IFTYPE_NAN_DATA: 4678 if (ieee80211_has_tods(hdr->frame_control) || 4679 ieee80211_has_fromds(hdr->frame_control)) 4680 return false; 4681 4682 if (ieee80211_is_data(hdr->frame_control)) { 4683 struct ieee80211_sub_if_data *nmi; 4684 4685 nmi = rcu_dereference(sdata->u.nan_data.nmi); 4686 if (!nmi) 4687 return false; 4688 4689 if (!ether_addr_equal(nmi->u.nan.conf.cluster_id, 4690 hdr->addr3)) 4691 return false; 4692 4693 return multicast || 4694 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4695 } 4696 4697 /* Non-public action frames (unicast or multicast) */ 4698 if (ieee80211_is_action(hdr->frame_control) && 4699 !ieee80211_is_public_action(hdr, skb->len) && 4700 (ether_addr_equal(nan_network_id, hdr->addr1) || 4701 ether_addr_equal(sdata->vif.addr, hdr->addr1))) 4702 return true; 4703 4704 /* Unicast secure management frames */ 4705 return ether_addr_equal(sdata->vif.addr, hdr->addr1) && 4706 ieee80211_is_unicast_robust_mgmt_frame(skb); 4707 case NL80211_IFTYPE_PD: 4708 /* 4709 * Accept only authentication frames (PASN) addressed to 4710 * this interface. 4711 */ 4712 return ieee80211_is_auth(hdr->frame_control) && 4713 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4714 default: 4715 break; 4716 } 4717 4718 WARN_ON_ONCE(1); 4719 return false; 4720 } 4721 4722 void ieee80211_check_fast_rx(struct sta_info *sta) 4723 { 4724 struct ieee80211_sub_if_data *sdata = sta->sdata; 4725 struct ieee80211_local *local = sdata->local; 4726 struct ieee80211_key *key; 4727 struct ieee80211_fast_rx fastrx = { 4728 .dev = sdata->dev, 4729 .vif_type = sdata->vif.type, 4730 .control_port_protocol = sdata->control_port_protocol, 4731 }, *old, *new = NULL; 4732 u32 offload_flags; 4733 bool set_offload = false; 4734 bool assign = false; 4735 bool offload; 4736 4737 /* use sparse to check that we don't return without updating */ 4738 __acquire(check_fast_rx); 4739 4740 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4741 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4742 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4743 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4744 4745 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4746 4747 /* fast-rx doesn't do reordering */ 4748 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4749 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4750 goto clear; 4751 4752 switch (sdata->vif.type) { 4753 case NL80211_IFTYPE_STATION: 4754 if (sta->sta.tdls) { 4755 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4756 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4757 fastrx.expected_ds_bits = 0; 4758 } else { 4759 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4760 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4761 fastrx.expected_ds_bits = 4762 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4763 } 4764 4765 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4766 fastrx.expected_ds_bits |= 4767 cpu_to_le16(IEEE80211_FCTL_TODS); 4768 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4769 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4770 } 4771 4772 if (!sdata->u.mgd.powersave) 4773 break; 4774 4775 /* software powersave is a huge mess, avoid all of it */ 4776 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4777 goto clear; 4778 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4779 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4780 goto clear; 4781 break; 4782 case NL80211_IFTYPE_AP_VLAN: 4783 case NL80211_IFTYPE_AP: 4784 /* parallel-rx requires this, at least with calls to 4785 * ieee80211_sta_ps_transition() 4786 */ 4787 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4788 goto clear; 4789 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4790 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4791 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4792 4793 fastrx.internal_forward = 4794 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4795 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4796 !sdata->u.vlan.sta); 4797 4798 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4799 sdata->u.vlan.sta) { 4800 fastrx.expected_ds_bits |= 4801 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4802 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4803 fastrx.internal_forward = 0; 4804 } 4805 4806 break; 4807 case NL80211_IFTYPE_MESH_POINT: 4808 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4809 IEEE80211_FCTL_TODS); 4810 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4811 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4812 break; 4813 default: 4814 goto clear; 4815 } 4816 4817 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4818 goto clear; 4819 4820 rcu_read_lock(); 4821 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4822 if (!key) 4823 key = rcu_dereference(sdata->default_unicast_key); 4824 if (key) { 4825 switch (key->conf.cipher) { 4826 case WLAN_CIPHER_SUITE_TKIP: 4827 /* we don't want to deal with MMIC in fast-rx */ 4828 goto clear_rcu; 4829 case WLAN_CIPHER_SUITE_CCMP: 4830 case WLAN_CIPHER_SUITE_CCMP_256: 4831 case WLAN_CIPHER_SUITE_GCMP: 4832 case WLAN_CIPHER_SUITE_GCMP_256: 4833 break; 4834 default: 4835 /* We also don't want to deal with 4836 * WEP or cipher scheme. 4837 */ 4838 goto clear_rcu; 4839 } 4840 4841 fastrx.key = true; 4842 fastrx.icv_len = key->conf.icv_len; 4843 } 4844 4845 assign = true; 4846 clear_rcu: 4847 rcu_read_unlock(); 4848 clear: 4849 __release(check_fast_rx); 4850 4851 if (assign) 4852 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4853 4854 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4855 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4856 4857 if (assign && offload) 4858 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4859 else 4860 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4861 4862 if (set_offload) 4863 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4864 4865 spin_lock_bh(&sta->lock); 4866 old = rcu_dereference_protected(sta->fast_rx, true); 4867 rcu_assign_pointer(sta->fast_rx, new); 4868 spin_unlock_bh(&sta->lock); 4869 4870 if (old) 4871 kfree_rcu(old, rcu_head); 4872 } 4873 4874 void ieee80211_clear_fast_rx(struct sta_info *sta) 4875 { 4876 struct ieee80211_fast_rx *old; 4877 4878 spin_lock_bh(&sta->lock); 4879 old = rcu_dereference_protected(sta->fast_rx, true); 4880 RCU_INIT_POINTER(sta->fast_rx, NULL); 4881 spin_unlock_bh(&sta->lock); 4882 4883 if (old) 4884 kfree_rcu(old, rcu_head); 4885 } 4886 4887 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4888 { 4889 struct ieee80211_local *local = sdata->local; 4890 struct sta_info *sta; 4891 4892 lockdep_assert_wiphy(local->hw.wiphy); 4893 4894 list_for_each_entry(sta, &local->sta_list, list) { 4895 if (sdata != sta->sdata && 4896 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4897 continue; 4898 ieee80211_check_fast_rx(sta); 4899 } 4900 } 4901 4902 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4903 { 4904 struct ieee80211_local *local = sdata->local; 4905 4906 lockdep_assert_wiphy(local->hw.wiphy); 4907 4908 __ieee80211_check_fast_rx_iface(sdata); 4909 } 4910 4911 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4912 struct ieee80211_fast_rx *fast_rx, 4913 int orig_len) 4914 { 4915 struct ieee80211_sta_rx_stats *stats; 4916 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4917 struct sta_info *sta = rx->sta; 4918 struct link_sta_info *link_sta; 4919 struct sk_buff *skb = rx->skb; 4920 void *sa = skb->data + ETH_ALEN; 4921 void *da = skb->data; 4922 4923 if (rx->link_id >= 0) { 4924 link_sta = rcu_dereference(sta->link[rx->link_id]); 4925 if (WARN_ON_ONCE(!link_sta)) { 4926 dev_kfree_skb(rx->skb); 4927 return; 4928 } 4929 } else { 4930 link_sta = &sta->deflink; 4931 } 4932 4933 stats = &link_sta->rx_stats; 4934 if (fast_rx->uses_rss) 4935 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4936 4937 /* statistics part of ieee80211_rx_h_sta_process() */ 4938 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4939 stats->last_signal = status->signal; 4940 if (!fast_rx->uses_rss) 4941 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4942 -status->signal); 4943 } 4944 4945 if (status->chains) { 4946 int i; 4947 4948 stats->chains = status->chains; 4949 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4950 int signal = status->chain_signal[i]; 4951 4952 if (!(status->chains & BIT(i))) 4953 continue; 4954 4955 stats->chain_signal_last[i] = signal; 4956 if (!fast_rx->uses_rss) 4957 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4958 -signal); 4959 } 4960 } 4961 /* end of statistics */ 4962 4963 stats->last_rx = jiffies; 4964 stats->last_rate = sta_stats_encode_rate(status); 4965 4966 stats->fragments++; 4967 stats->packets++; 4968 4969 skb->dev = fast_rx->dev; 4970 4971 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4972 4973 /* The seqno index has the same property as needed 4974 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4975 * for non-QoS-data frames. Here we know it's a data 4976 * frame, so count MSDUs. 4977 */ 4978 u64_stats_update_begin(&stats->syncp); 4979 u64_stats_inc(&stats->msdu[rx->seqno_idx]); 4980 u64_stats_add(&stats->bytes, orig_len); 4981 u64_stats_update_end(&stats->syncp); 4982 4983 if (fast_rx->internal_forward) { 4984 struct sk_buff *xmit_skb = NULL; 4985 if (is_multicast_ether_addr(da)) { 4986 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4987 } else if (!ether_addr_equal(da, sa) && 4988 sta_info_get(rx->sdata, da)) { 4989 xmit_skb = skb; 4990 skb = NULL; 4991 } 4992 4993 if (xmit_skb) { 4994 /* 4995 * Send to wireless media and increase priority by 256 4996 * to keep the received priority instead of 4997 * reclassifying the frame (see cfg80211_classify8021d). 4998 */ 4999 xmit_skb->priority += 256; 5000 xmit_skb->protocol = htons(ETH_P_802_3); 5001 skb_reset_network_header(xmit_skb); 5002 skb_reset_mac_header(xmit_skb); 5003 dev_queue_xmit(xmit_skb); 5004 } 5005 5006 if (!skb) 5007 return; 5008 } 5009 5010 /* deliver to local stack */ 5011 skb->protocol = eth_type_trans(skb, fast_rx->dev); 5012 ieee80211_deliver_skb_to_local_stack(skb, rx); 5013 } 5014 5015 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 5016 struct ieee80211_fast_rx *fast_rx) 5017 { 5018 struct sk_buff *skb = rx->skb; 5019 struct ieee80211_hdr *hdr = (void *)skb->data; 5020 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5021 ieee80211_rx_result res; 5022 int orig_len = skb->len; 5023 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 5024 int snap_offs = hdrlen; 5025 struct { 5026 u8 snap[sizeof(rfc1042_header)]; 5027 __be16 proto; 5028 } *payload __aligned(2); 5029 struct { 5030 u8 da[ETH_ALEN]; 5031 u8 sa[ETH_ALEN]; 5032 } addrs __aligned(2); 5033 struct ieee80211_sta_rx_stats *stats; 5034 u32 encoded_rate; 5035 5036 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 5037 * to a common data structure; drivers can implement that per queue 5038 * but we don't have that information in mac80211 5039 */ 5040 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 5041 return false; 5042 5043 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 5044 5045 /* If using encryption, we also need to have: 5046 * - PN_VALIDATED: similar, but the implementation is tricky 5047 * - DECRYPTED: necessary for PN_VALIDATED 5048 */ 5049 if (fast_rx->key && 5050 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 5051 return false; 5052 5053 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 5054 return false; 5055 5056 if (unlikely(ieee80211_is_frag(hdr))) 5057 return false; 5058 5059 /* Since our interface address cannot be multicast, this 5060 * implicitly also rejects multicast frames without the 5061 * explicit check. 5062 * 5063 * We shouldn't get any *data* frames not addressed to us 5064 * (AP mode will accept multicast *management* frames), but 5065 * punting here will make it go through the full checks in 5066 * ieee80211_accept_frame(). 5067 */ 5068 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 5069 return false; 5070 5071 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 5072 IEEE80211_FCTL_TODS)) != 5073 fast_rx->expected_ds_bits) 5074 return false; 5075 5076 /* assign the key to drop unencrypted frames (later) 5077 * and strip the IV/MIC if necessary 5078 */ 5079 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 5080 /* GCMP header length is the same */ 5081 snap_offs += IEEE80211_CCMP_HDR_LEN; 5082 } 5083 5084 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 5085 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 5086 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 5087 return false; 5088 5089 payload = (void *)(skb->data + snap_offs); 5090 5091 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 5092 return false; 5093 5094 /* Don't handle these here since they require special code. 5095 * Accept AARP and IPX even though they should come with a 5096 * bridge-tunnel header - but if we get them this way then 5097 * there's little point in discarding them. 5098 */ 5099 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 5100 payload->proto == fast_rx->control_port_protocol)) 5101 return false; 5102 } 5103 5104 /* after this point, don't punt to the slowpath! */ 5105 5106 if (fast_rx->uses_rss) 5107 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 5108 else 5109 stats = &rx->link_sta->rx_stats; 5110 5111 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 5112 pskb_trim(skb, skb->len - fast_rx->icv_len)) 5113 goto drop; 5114 5115 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 5116 goto drop; 5117 5118 if (status->rx_flags & IEEE80211_RX_AMSDU) { 5119 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 5120 RX_QUEUED) 5121 goto drop; 5122 5123 return true; 5124 } 5125 5126 /* do the header conversion - first grab the addresses */ 5127 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 5128 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 5129 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 5130 skb_pull(skb, snap_offs - 2); 5131 put_unaligned_be16(skb->len - 2, skb->data); 5132 } else { 5133 skb_postpull_rcsum(skb, skb->data + snap_offs, 5134 sizeof(rfc1042_header) + 2); 5135 5136 /* remove the SNAP but leave the ethertype */ 5137 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 5138 } 5139 /* push the addresses in front */ 5140 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 5141 5142 /* capture before mesh forward may memset or free skb->cb */ 5143 encoded_rate = sta_stats_encode_rate(status); 5144 5145 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 5146 switch (res) { 5147 case RX_QUEUED: 5148 stats->last_rx = jiffies; 5149 stats->last_rate = encoded_rate; 5150 return true; 5151 case RX_CONTINUE: 5152 break; 5153 default: 5154 goto drop; 5155 } 5156 5157 ieee80211_rx_8023(rx, fast_rx, orig_len); 5158 5159 return true; 5160 drop: 5161 dev_kfree_skb(skb); 5162 5163 stats->dropped++; 5164 return true; 5165 } 5166 5167 /* 5168 * This function returns whether or not the SKB 5169 * was destined for RX processing or not, which, 5170 * if consume is true, is equivalent to whether 5171 * or not the skb was consumed. 5172 */ 5173 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 5174 struct sk_buff *skb, bool consume) 5175 { 5176 struct ieee80211_local *local = rx->local; 5177 struct ieee80211_sub_if_data *sdata = rx->sdata; 5178 struct ieee80211_hdr *hdr = (void *)skb->data; 5179 struct link_sta_info *link_sta = rx->link_sta; 5180 struct ieee80211_link_data *link = rx->link; 5181 5182 rx->skb = skb; 5183 5184 /* See if we can do fast-rx; if we have to copy we already lost, 5185 * so punt in that case. We should never have to deliver a data 5186 * frame to multiple interfaces anyway. 5187 * 5188 * We skip the ieee80211_accept_frame() call and do the necessary 5189 * checking inside ieee80211_invoke_fast_rx(). 5190 */ 5191 if (consume && rx->sta) { 5192 struct ieee80211_fast_rx *fast_rx; 5193 5194 fast_rx = rcu_dereference(rx->sta->fast_rx); 5195 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5196 return true; 5197 } 5198 5199 if (!ieee80211_accept_frame(rx)) 5200 return false; 5201 5202 if (!consume) { 5203 struct skb_shared_hwtstamps *shwt; 5204 5205 rx->skb = skb_copy(skb, GFP_ATOMIC); 5206 if (!rx->skb) { 5207 if (net_ratelimit()) 5208 wiphy_debug(local->hw.wiphy, 5209 "failed to copy skb for %s\n", 5210 sdata->name); 5211 return true; 5212 } 5213 5214 /* skb_copy() does not copy the hw timestamps, so copy it 5215 * explicitly 5216 */ 5217 shwt = skb_hwtstamps(rx->skb); 5218 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5219 5220 /* Update the hdr pointer to the new skb for translation below */ 5221 hdr = (struct ieee80211_hdr *)rx->skb->data; 5222 } 5223 5224 if (ieee80211_is_s1g_beacon(hdr->frame_control)) { 5225 ieee80211_invoke_rx_handlers(rx); 5226 return true; 5227 } 5228 5229 /* Store a copy of the pre-translated link addresses for SW crypto */ 5230 if (unlikely(is_unicast_ether_addr(hdr->addr1) && 5231 !ieee80211_is_data(hdr->frame_control))) 5232 memcpy(rx->link_addrs, &hdr->addrs, 3 * ETH_ALEN); 5233 5234 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5235 is_unicast_ether_addr(hdr->addr1) && 5236 !ieee80211_is_probe_resp(hdr->frame_control) && 5237 !ieee80211_is_beacon(hdr->frame_control)) { 5238 /* translate to MLD addresses */ 5239 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5240 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5241 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5242 ether_addr_copy(hdr->addr2, rx->sta->addr); 5243 /* translate A3 only if it's the BSSID */ 5244 if (!ieee80211_has_tods(hdr->frame_control) && 5245 !ieee80211_has_fromds(hdr->frame_control)) { 5246 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5247 ether_addr_copy(hdr->addr3, rx->sta->addr); 5248 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5249 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5250 } 5251 /* not needed for A4 since it can only carry the SA */ 5252 } 5253 5254 ieee80211_invoke_rx_handlers(rx); 5255 return true; 5256 } 5257 5258 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5259 struct ieee80211_sta *pubsta, 5260 struct sk_buff *skb, 5261 struct list_head *list) 5262 { 5263 struct ieee80211_local *local = hw_to_local(hw); 5264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5265 struct ieee80211_fast_rx *fast_rx; 5266 struct ieee80211_rx_data rx; 5267 struct sta_info *sta; 5268 int link_id = -1; 5269 5270 memset(&rx, 0, sizeof(rx)); 5271 rx.skb = skb; 5272 rx.local = local; 5273 rx.list = list; 5274 rx.link_id = -1; 5275 5276 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5277 5278 /* drop frame if too short for header */ 5279 if (skb->len < sizeof(struct ethhdr)) 5280 goto drop; 5281 5282 if (!pubsta) 5283 goto drop; 5284 5285 if (status->link_valid) 5286 link_id = status->link_id; 5287 5288 /* 5289 * TODO: Should the frame be dropped if the right link_id is not 5290 * available? Or may be it is fine in the current form to proceed with 5291 * the frame processing because with frame being in 802.3 format, 5292 * link_id is used only for stats purpose and updating the stats on 5293 * the deflink is fine? 5294 */ 5295 sta = container_of(pubsta, struct sta_info, sta); 5296 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5297 goto drop; 5298 5299 fast_rx = rcu_dereference(rx.sta->fast_rx); 5300 if (!fast_rx) 5301 goto drop; 5302 5303 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5304 return; 5305 5306 drop: 5307 dev_kfree_skb(skb); 5308 } 5309 5310 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5311 struct sk_buff *skb, bool consume) 5312 { 5313 struct link_sta_info *link_sta; 5314 struct ieee80211_hdr *hdr = (void *)skb->data; 5315 struct sta_info *sta; 5316 int link_id = -1; 5317 5318 if (ieee80211_is_s1g_beacon(hdr->frame_control)) { 5319 if (!ieee80211_rx_data_set_sta(rx, NULL, -1)) 5320 return false; 5321 5322 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5323 } 5324 5325 /* 5326 * Look up link station first, in case there's a 5327 * chance that they might have a link address that 5328 * is identical to the MLD address, that way we'll 5329 * have the link information if needed. 5330 */ 5331 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5332 if (link_sta) { 5333 sta = link_sta->sta; 5334 link_id = link_sta->link_id; 5335 } else { 5336 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5337 5338 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5339 if (status->link_valid) { 5340 link_id = status->link_id; 5341 } else if (ieee80211_vif_is_mld(&rx->sdata->vif) && 5342 status->freq) { 5343 struct ieee80211_link_data *link; 5344 struct ieee80211_chanctx_conf *conf; 5345 5346 for_each_link_data_rcu(rx->sdata, link) { 5347 conf = rcu_dereference(link->conf->chanctx_conf); 5348 if (!conf || !conf->def.chan) 5349 continue; 5350 5351 if (status->freq == conf->def.chan->center_freq) { 5352 link_id = link->link_id; 5353 break; 5354 } 5355 } 5356 } 5357 } 5358 5359 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5360 return false; 5361 5362 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5363 } 5364 5365 /* 5366 * This is the actual Rx frames handler. as it belongs to Rx path it must 5367 * be called with rcu_read_lock protection. 5368 */ 5369 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5370 struct ieee80211_sta *pubsta, 5371 struct sk_buff *skb, 5372 struct list_head *list) 5373 { 5374 struct ieee80211_local *local = hw_to_local(hw); 5375 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5376 struct ieee80211_sub_if_data *sdata; 5377 struct ieee80211_hdr *hdr; 5378 __le16 fc; 5379 struct ieee80211_rx_data rx; 5380 struct ieee80211_sub_if_data *prev; 5381 struct rhlist_head *tmp; 5382 int err = 0; 5383 5384 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5385 memset(&rx, 0, sizeof(rx)); 5386 rx.skb = skb; 5387 rx.local = local; 5388 rx.list = list; 5389 rx.link_id = -1; 5390 5391 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5392 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5393 5394 if (ieee80211_is_mgmt(fc)) { 5395 /* drop frame if too short for header */ 5396 if (skb->len < ieee80211_hdrlen(fc)) 5397 err = -ENOBUFS; 5398 else 5399 err = skb_linearize(skb); 5400 } else if (ieee80211_is_s1g_beacon(fc)) { 5401 size_t s1g_hdr_len = offsetof(struct ieee80211_ext, 5402 u.s1g_beacon.variable) + 5403 ieee80211_s1g_optional_len(fc); 5404 5405 if (skb->len < s1g_hdr_len) 5406 err = -ENOBUFS; 5407 else 5408 err = skb_linearize(skb); 5409 } else if (ieee80211_is_ext(fc)) { 5410 err = -EINVAL; 5411 } else { 5412 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5413 } 5414 5415 if (err) { 5416 dev_kfree_skb(skb); 5417 return; 5418 } 5419 5420 hdr = (struct ieee80211_hdr *)skb->data; 5421 ieee80211_parse_qos(&rx); 5422 ieee80211_verify_alignment(&rx); 5423 5424 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5425 ieee80211_is_beacon(hdr->frame_control) || 5426 ieee80211_is_s1g_beacon(hdr->frame_control))) 5427 ieee80211_scan_rx(local, skb); 5428 5429 if (ieee80211_is_data(fc)) { 5430 struct sta_info *sta, *prev_sta; 5431 int link_id = -1; 5432 5433 if (status->link_valid) 5434 link_id = status->link_id; 5435 5436 if (pubsta) { 5437 sta = container_of(pubsta, struct sta_info, sta); 5438 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5439 goto out; 5440 5441 /* 5442 * In MLO connection, fetch the link_id using addr2 5443 * when the driver does not pass link_id in status. 5444 * When the address translation is already performed by 5445 * driver/hw, the valid link_id must be passed in 5446 * status. 5447 */ 5448 5449 if (!status->link_valid && pubsta->mlo) { 5450 struct link_sta_info *link_sta; 5451 5452 link_sta = link_sta_info_get_bss(rx.sdata, 5453 hdr->addr2); 5454 if (!link_sta) 5455 goto out; 5456 5457 if (!ieee80211_rx_data_set_link(&rx, 5458 link_sta->link_id)) 5459 goto out; 5460 } 5461 5462 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5463 return; 5464 goto out; 5465 } 5466 5467 prev_sta = NULL; 5468 5469 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5470 if (!prev_sta) { 5471 prev_sta = sta; 5472 continue; 5473 } 5474 5475 rx.sdata = prev_sta->sdata; 5476 if (!status->link_valid && prev_sta->sta.mlo) { 5477 struct link_sta_info *link_sta; 5478 5479 link_sta = link_sta_info_get_bss(rx.sdata, 5480 hdr->addr2); 5481 if (!link_sta) 5482 continue; 5483 5484 link_id = link_sta->link_id; 5485 } 5486 5487 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5488 goto out; 5489 5490 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5491 5492 prev_sta = sta; 5493 } 5494 5495 if (prev_sta) { 5496 rx.sdata = prev_sta->sdata; 5497 if (!status->link_valid && prev_sta->sta.mlo) { 5498 struct link_sta_info *link_sta; 5499 5500 link_sta = link_sta_info_get_bss(rx.sdata, 5501 hdr->addr2); 5502 if (!link_sta) 5503 goto out; 5504 5505 link_id = link_sta->link_id; 5506 } 5507 5508 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5509 goto out; 5510 5511 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5512 return; 5513 goto out; 5514 } 5515 } 5516 5517 prev = NULL; 5518 5519 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5520 if (!ieee80211_sdata_running(sdata)) 5521 continue; 5522 5523 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5524 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5525 continue; 5526 5527 /* 5528 * frame is destined for this interface, but if it's 5529 * not also for the previous one we handle that after 5530 * the loop to avoid copying the SKB once too much 5531 */ 5532 5533 if (!prev) { 5534 prev = sdata; 5535 continue; 5536 } 5537 5538 rx.sdata = prev; 5539 ieee80211_rx_for_interface(&rx, skb, false); 5540 5541 prev = sdata; 5542 } 5543 5544 if (prev) { 5545 rx.sdata = prev; 5546 5547 if (ieee80211_rx_for_interface(&rx, skb, true)) 5548 return; 5549 } 5550 5551 out: 5552 dev_kfree_skb(skb); 5553 } 5554 5555 /* 5556 * This is the receive path handler. It is called by a low level driver when an 5557 * 802.11 MPDU is received from the hardware. 5558 */ 5559 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5560 struct sk_buff *skb, struct list_head *list) 5561 { 5562 struct ieee80211_local *local = hw_to_local(hw); 5563 struct ieee80211_rate *rate = NULL; 5564 struct ieee80211_supported_band *sband; 5565 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5567 5568 WARN_ON_ONCE(softirq_count() == 0); 5569 5570 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5571 goto drop; 5572 5573 sband = local->hw.wiphy->bands[status->band]; 5574 if (WARN_ON(!sband)) 5575 goto drop; 5576 5577 /* 5578 * If we're suspending, it is possible although not too likely 5579 * that we'd be receiving frames after having already partially 5580 * quiesced the stack. We can't process such frames then since 5581 * that might, for example, cause stations to be added or other 5582 * driver callbacks be invoked. 5583 */ 5584 if (unlikely(local->quiescing || local->suspended)) 5585 goto drop; 5586 5587 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5588 if (unlikely(local->in_reconfig)) 5589 goto drop; 5590 5591 /* 5592 * The same happens when we're not even started, 5593 * but that's worth a warning. 5594 */ 5595 if (WARN_ON(!local->started)) 5596 goto drop; 5597 5598 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC) && 5599 !(status->flag & RX_FLAG_NO_PSDU && 5600 status->zero_length_psdu_type == 5601 IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED))) { 5602 /* 5603 * Validate the rate, unless there was a PLCP error which may 5604 * have an invalid rate or the PSDU was not capture and may be 5605 * missing rate information. 5606 */ 5607 5608 switch (status->encoding) { 5609 case RX_ENC_HT: 5610 /* 5611 * rate_idx is MCS index, which can be [0-76] 5612 * as documented on: 5613 * 5614 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5615 * 5616 * Anything else would be some sort of driver or 5617 * hardware error. The driver should catch hardware 5618 * errors. 5619 */ 5620 if (WARN(status->rate_idx > 76, 5621 "Rate marked as an HT rate but passed " 5622 "status->rate_idx is not " 5623 "an MCS index [0-76]: %d (0x%02x)\n", 5624 status->rate_idx, 5625 status->rate_idx)) 5626 goto drop; 5627 break; 5628 case RX_ENC_VHT: 5629 if (WARN_ONCE(status->rate_idx > 11 || 5630 !status->nss || 5631 status->nss > 8, 5632 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5633 status->rate_idx, status->nss)) 5634 goto drop; 5635 break; 5636 case RX_ENC_HE: 5637 if (WARN_ONCE(status->rate_idx > 11 || 5638 !status->nss || 5639 status->nss > 8, 5640 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5641 status->rate_idx, status->nss)) 5642 goto drop; 5643 break; 5644 case RX_ENC_EHT: 5645 if (WARN_ONCE(status->rate_idx > 15 || 5646 !status->nss || 5647 status->nss > 8 || 5648 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5649 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5650 status->rate_idx, status->nss, status->eht.gi)) 5651 goto drop; 5652 break; 5653 case RX_ENC_UHR: 5654 if (WARN_ONCE(!(status->rate_idx <= 15 || 5655 status->rate_idx == 17 || 5656 status->rate_idx == 19 || 5657 status->rate_idx == 20 || 5658 status->rate_idx == 23) || 5659 !status->nss || 5660 status->nss > 8 || 5661 status->uhr.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5662 "Rate marked as a UHR rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5663 status->rate_idx, status->nss, status->uhr.gi)) 5664 goto drop; 5665 if (WARN_ONCE(status->uhr.elr && 5666 (status->nss != 1 || status->rate_idx > 1 || 5667 status->uhr.gi != NL80211_RATE_INFO_EHT_GI_1_6 || 5668 status->bw != RATE_INFO_BW_20 || status->uhr.im), 5669 "bad UHR ELR MCS MCS:%d, NSS:%d, GI:%d, BW:%d, IM:%d\n", 5670 status->rate_idx, status->nss, status->uhr.gi, 5671 status->bw, status->uhr.im)) 5672 goto drop; 5673 if (WARN_ONCE(status->uhr.im && 5674 (status->nss != 1 || status->rate_idx == 15), 5675 "bad UHR IM MCS MCS:%d, NSS:%d\n", 5676 status->rate_idx, status->nss)) 5677 goto drop; 5678 break; 5679 case RX_ENC_S1G: 5680 if (WARN_ONCE(status->rate_idx > 12 || 5681 !status->nss || 5682 status->nss > 4, 5683 "Rate marked as an S1G rate but data is invalid: MCS: %d, NSS: %d\n", 5684 status->rate_idx, status->nss)) 5685 goto drop; 5686 break; 5687 default: 5688 WARN_ON_ONCE(1); 5689 fallthrough; 5690 case RX_ENC_LEGACY: 5691 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5692 goto drop; 5693 rate = &sband->bitrates[status->rate_idx]; 5694 } 5695 } 5696 5697 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5698 goto drop; 5699 5700 status->rx_flags = 0; 5701 5702 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5703 5704 /* 5705 * Frames with failed FCS/PLCP checksum are not returned, 5706 * all other frames are returned without radiotap header 5707 * if it was previously present. 5708 * Also, frames with less than 16 bytes are dropped. 5709 */ 5710 if (!(status->flag & RX_FLAG_8023)) 5711 skb = ieee80211_rx_monitor(local, skb, rate); 5712 if (skb) { 5713 if ((status->flag & RX_FLAG_8023) || 5714 ieee80211_is_data_present(hdr->frame_control)) 5715 ieee80211_tpt_led_trig_rx(local, skb->len); 5716 5717 if (status->flag & RX_FLAG_8023) 5718 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5719 else 5720 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5721 } 5722 5723 kcov_remote_stop(); 5724 return; 5725 drop: 5726 kfree_skb(skb); 5727 } 5728 EXPORT_SYMBOL(ieee80211_rx_list); 5729 5730 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5731 struct sk_buff *skb, struct napi_struct *napi) 5732 { 5733 struct sk_buff *tmp; 5734 LIST_HEAD(list); 5735 5736 5737 /* 5738 * key references and virtual interfaces are protected using RCU 5739 * and this requires that we are in a read-side RCU section during 5740 * receive processing 5741 */ 5742 rcu_read_lock(); 5743 ieee80211_rx_list(hw, pubsta, skb, &list); 5744 rcu_read_unlock(); 5745 5746 if (!napi) { 5747 netif_receive_skb_list(&list); 5748 return; 5749 } 5750 5751 list_for_each_entry_safe(skb, tmp, &list, list) { 5752 skb_list_del_init(skb); 5753 napi_gro_receive(napi, skb); 5754 } 5755 } 5756 EXPORT_SYMBOL(ieee80211_rx_napi); 5757 5758 /* This is a version of the rx handler that can be called from hard irq 5759 * context. Post the skb on the queue and schedule the tasklet */ 5760 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5761 { 5762 struct ieee80211_local *local = hw_to_local(hw); 5763 5764 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5765 5766 skb->pkt_type = IEEE80211_RX_MSG; 5767 skb_queue_tail(&local->skb_queue, skb); 5768 tasklet_schedule(&local->tasklet); 5769 } 5770 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5771