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 if (unlikely((u32)entry->extra_len + rx->skb->len > U16_MAX)) { 2503 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2504 __skb_queue_purge(&entry->skb_list); 2505 return RX_DROP_U_DEFRAG_OVERFLOW; 2506 } 2507 2508 __skb_queue_tail(&entry->skb_list, rx->skb); 2509 entry->last_frag = frag; 2510 entry->extra_len += rx->skb->len; 2511 if (ieee80211_has_morefrags(fc)) { 2512 rx->skb = NULL; 2513 return RX_QUEUED; 2514 } 2515 2516 rx->skb = __skb_dequeue(&entry->skb_list); 2517 if (skb_tailroom(rx->skb) < entry->extra_len) { 2518 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2519 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2520 GFP_ATOMIC))) { 2521 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2522 __skb_queue_purge(&entry->skb_list); 2523 return RX_DROP_U_OOM; 2524 } 2525 } 2526 while ((skb = __skb_dequeue(&entry->skb_list))) { 2527 skb_put_data(rx->skb, skb->data, skb->len); 2528 dev_kfree_skb(skb); 2529 } 2530 2531 out: 2532 ieee80211_led_rx(rx->local); 2533 if (rx->sta) 2534 rx->link_sta->rx_stats.packets++; 2535 return RX_CONTINUE; 2536 } 2537 2538 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2539 { 2540 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2541 return -EACCES; 2542 2543 return 0; 2544 } 2545 2546 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2547 { 2548 struct sk_buff *skb = rx->skb; 2549 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2550 2551 /* 2552 * Pass through unencrypted frames if the hardware has 2553 * decrypted them already. 2554 */ 2555 if (status->flag & RX_FLAG_DECRYPTED) 2556 return 0; 2557 2558 /* Drop unencrypted frames if key is set. */ 2559 if (unlikely(!ieee80211_has_protected(fc) && 2560 !ieee80211_is_any_nullfunc(fc) && 2561 ieee80211_is_data(fc) && rx->key)) 2562 return -EACCES; 2563 2564 return 0; 2565 } 2566 2567 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2568 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2569 { 2570 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2571 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2572 __le16 fc = mgmt->frame_control; 2573 2574 /* 2575 * Pass through unencrypted frames if the hardware has 2576 * decrypted them already. 2577 */ 2578 if (status->flag & RX_FLAG_DECRYPTED) 2579 return RX_CONTINUE; 2580 2581 /* drop unicast protected dual (that wasn't protected) */ 2582 if (ieee80211_is_action(fc) && 2583 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2584 return RX_DROP_U_UNPROT_DUAL; 2585 2586 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2587 if (unlikely(!ieee80211_has_protected(fc) && 2588 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2589 if (ieee80211_is_deauth(fc) || 2590 ieee80211_is_disassoc(fc)) { 2591 /* 2592 * Permit unprotected deauth/disassoc frames 2593 * during 4-way-HS (key is installed after HS). 2594 */ 2595 if (!rx->key) 2596 return RX_CONTINUE; 2597 2598 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2599 rx->skb->data, 2600 rx->skb->len); 2601 } 2602 return RX_DROP_U_UNPROT_UCAST_MGMT; 2603 } 2604 /* BIP does not use Protected field, so need to check MMIE */ 2605 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2606 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2607 if (ieee80211_is_deauth(fc) || 2608 ieee80211_is_disassoc(fc)) 2609 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2610 rx->skb->data, 2611 rx->skb->len); 2612 return RX_DROP_U_UNPROT_MCAST_MGMT; 2613 } 2614 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2615 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2616 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2617 rx->skb->data, 2618 rx->skb->len); 2619 return RX_DROP_U_UNPROT_BEACON; 2620 } 2621 /* 2622 * When using MFP, Action frames are not allowed prior to 2623 * having configured keys. 2624 */ 2625 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2626 ieee80211_is_robust_mgmt_frame(rx->skb))) 2627 return RX_DROP_U_UNPROT_ACTION; 2628 2629 /* drop unicast public action frames when using MPF */ 2630 if (is_unicast_ether_addr(mgmt->da) && 2631 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2632 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2633 } 2634 2635 /* 2636 * Drop robust action frames before assoc regardless of MFP state, 2637 * after assoc we also have decided on MFP or not. 2638 */ 2639 if (ieee80211_is_action(fc) && 2640 ieee80211_is_robust_mgmt_frame(rx->skb) && 2641 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2642 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2643 2644 /* 2645 * Drop unprotected (Re)Association Request/Response frame received from 2646 * an EPP Peer. 2647 */ 2648 if (!ieee80211_has_protected(fc) && 2649 ieee80211_require_encrypted_assoc(fc, rx->sta)) 2650 return RX_DROP_U_UNPROT_UCAST_MGMT; 2651 2652 return RX_CONTINUE; 2653 } 2654 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2655 2656 static ieee80211_rx_result 2657 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2658 { 2659 struct ieee80211_sub_if_data *sdata = rx->sdata; 2660 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2661 bool check_port_control = false; 2662 struct ethhdr *ehdr; 2663 int ret; 2664 2665 *port_control = false; 2666 if (ieee80211_has_a4(hdr->frame_control) && 2667 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2668 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2669 2670 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2671 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2672 if (!sdata->u.mgd.use_4addr) 2673 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2674 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2675 check_port_control = true; 2676 } 2677 2678 if (is_multicast_ether_addr(hdr->addr1) && 2679 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2680 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2681 2682 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2683 if (ret < 0) 2684 return RX_DROP_U_INVALID_8023; 2685 2686 ehdr = (struct ethhdr *) rx->skb->data; 2687 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2688 *port_control = true; 2689 else if (check_port_control) 2690 return RX_DROP_U_NOT_PORT_CONTROL; 2691 2692 return RX_CONTINUE; 2693 } 2694 2695 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2696 const u8 *addr, int *out_link_id) 2697 { 2698 unsigned int link_id; 2699 2700 /* non-MLO, or MLD address replaced by hardware */ 2701 if (ether_addr_equal(sdata->vif.addr, addr)) 2702 return true; 2703 2704 if (!ieee80211_vif_is_mld(&sdata->vif)) 2705 return false; 2706 2707 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2708 struct ieee80211_bss_conf *conf; 2709 2710 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2711 2712 if (!conf) 2713 continue; 2714 if (ether_addr_equal(conf->addr, addr)) { 2715 if (out_link_id) 2716 *out_link_id = link_id; 2717 return true; 2718 } 2719 } 2720 2721 return false; 2722 } 2723 2724 /* 2725 * requires that rx->skb is a frame with ethernet header 2726 */ 2727 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2728 { 2729 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2730 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2731 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2732 2733 /* 2734 * Allow EAPOL frames to us/the PAE group address regardless of 2735 * whether the frame was encrypted or not, and always disallow 2736 * all other destination addresses for them. 2737 */ 2738 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2739 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2740 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2741 2742 if (ieee80211_802_1x_port_control(rx) || 2743 ieee80211_drop_unencrypted(rx, fc)) 2744 return false; 2745 2746 return true; 2747 } 2748 2749 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2750 struct ieee80211_rx_data *rx) 2751 { 2752 struct ieee80211_sub_if_data *sdata = rx->sdata; 2753 struct net_device *dev = sdata->dev; 2754 2755 if (unlikely((skb->protocol == sdata->control_port_protocol || 2756 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2757 !sdata->control_port_no_preauth)) && 2758 sdata->control_port_over_nl80211)) { 2759 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2760 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2761 2762 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2763 dev_kfree_skb(skb); 2764 } else { 2765 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2766 2767 memset(skb->cb, 0, sizeof(skb->cb)); 2768 2769 /* 2770 * 802.1X over 802.11 requires that the authenticator address 2771 * be used for EAPOL frames. However, 802.1X allows the use of 2772 * the PAE group address instead. If the interface is part of 2773 * a bridge and we pass the frame with the PAE group address, 2774 * then the bridge will forward it to the network (even if the 2775 * client was not associated yet), which isn't supposed to 2776 * happen. 2777 * To avoid that, rewrite the destination address to our own 2778 * address, so that the authenticator (e.g. hostapd) will see 2779 * the frame, but bridge won't forward it anywhere else. Note 2780 * that due to earlier filtering, the only other address can 2781 * be the PAE group address, unless the hardware allowed them 2782 * through in 802.3 offloaded mode. 2783 */ 2784 if (unlikely(skb->protocol == sdata->control_port_protocol && 2785 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2786 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2787 2788 /* deliver to local stack */ 2789 if (rx->list) 2790 list_add_tail(&skb->list, rx->list); 2791 else 2792 netif_receive_skb(skb); 2793 } 2794 } 2795 2796 /* 2797 * requires that rx->skb is a frame with ethernet header 2798 */ 2799 static void 2800 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2801 { 2802 struct ieee80211_sub_if_data *sdata = rx->sdata; 2803 struct net_device *dev = sdata->dev; 2804 struct sk_buff *skb, *xmit_skb; 2805 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2806 struct sta_info *dsta; 2807 2808 skb = rx->skb; 2809 xmit_skb = NULL; 2810 2811 dev_sw_netstats_rx_add(dev, skb->len); 2812 2813 if (rx->sta) { 2814 /* The seqno index has the same property as needed 2815 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2816 * for non-QoS-data frames. Here we know it's a data 2817 * frame, so count MSDUs. 2818 */ 2819 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2820 u64_stats_inc(&rx->link_sta->rx_stats.msdu[rx->seqno_idx]); 2821 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2822 } 2823 2824 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2825 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2826 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2827 ehdr->h_proto != rx->sdata->control_port_protocol && 2828 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2829 if (is_multicast_ether_addr(ehdr->h_dest) && 2830 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2831 /* 2832 * send multicast frames both to higher layers in 2833 * local net stack and back to the wireless medium 2834 */ 2835 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2836 if (!xmit_skb) 2837 net_info_ratelimited("%s: failed to clone multicast frame\n", 2838 dev->name); 2839 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2840 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2841 dsta = sta_info_get(sdata, ehdr->h_dest); 2842 if (dsta) { 2843 /* 2844 * The destination station is associated to 2845 * this AP (in this VLAN), so send the frame 2846 * directly to it and do not pass it to local 2847 * net stack. 2848 */ 2849 xmit_skb = skb; 2850 skb = NULL; 2851 } 2852 } 2853 } 2854 2855 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2856 if (skb) { 2857 /* 'align' will only take the values 0 or 2 here since all 2858 * frames are required to be aligned to 2-byte boundaries 2859 * when being passed to mac80211; the code here works just 2860 * as well if that isn't true, but mac80211 assumes it can 2861 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2862 */ 2863 int align; 2864 2865 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2866 if (align) { 2867 if (WARN_ON(skb_headroom(skb) < 3)) { 2868 dev_kfree_skb(skb); 2869 skb = NULL; 2870 } else { 2871 u8 *data = skb->data; 2872 size_t len = skb_headlen(skb); 2873 skb->data -= align; 2874 memmove(skb->data, data, len); 2875 skb_set_tail_pointer(skb, len); 2876 } 2877 } 2878 } 2879 #endif 2880 2881 if (skb) { 2882 skb->protocol = eth_type_trans(skb, dev); 2883 ieee80211_deliver_skb_to_local_stack(skb, rx); 2884 } 2885 2886 if (xmit_skb) { 2887 /* 2888 * Send to wireless media and increase priority by 256 to 2889 * keep the received priority instead of reclassifying 2890 * the frame (see cfg80211_classify8021d). 2891 */ 2892 xmit_skb->priority += 256; 2893 xmit_skb->protocol = htons(ETH_P_802_3); 2894 skb_reset_network_header(xmit_skb); 2895 skb_reset_mac_header(xmit_skb); 2896 dev_queue_xmit(xmit_skb); 2897 } 2898 } 2899 2900 #ifdef CONFIG_MAC80211_MESH 2901 static bool 2902 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2903 struct sk_buff *skb, int hdrlen) 2904 { 2905 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2906 struct ieee80211_mesh_fast_tx_key key = { 2907 .type = MESH_FAST_TX_TYPE_FORWARDED 2908 }; 2909 struct ieee80211_mesh_fast_tx *entry; 2910 struct ieee80211s_hdr *mesh_hdr; 2911 struct tid_ampdu_tx *tid_tx; 2912 struct sta_info *sta; 2913 struct ethhdr eth; 2914 u8 tid; 2915 2916 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2917 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2918 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2919 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2920 ether_addr_copy(key.addr, skb->data); 2921 else 2922 return false; 2923 2924 entry = mesh_fast_tx_get(sdata, &key); 2925 if (!entry) 2926 return false; 2927 2928 sta = rcu_dereference(entry->mpath->next_hop); 2929 if (!sta) 2930 return false; 2931 2932 if (skb_linearize(skb)) 2933 return false; 2934 2935 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2936 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2937 if (tid_tx) { 2938 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2939 return false; 2940 2941 if (tid_tx->timeout) 2942 tid_tx->last_tx = jiffies; 2943 } 2944 2945 ieee80211_aggr_check(sdata, sta, skb); 2946 2947 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2948 &skb->protocol)) 2949 hdrlen += ETH_ALEN; 2950 else 2951 skb->protocol = htons(skb->len - hdrlen); 2952 skb_set_network_header(skb, hdrlen + 2); 2953 2954 skb->dev = sdata->dev; 2955 memcpy(ð, skb->data, ETH_HLEN - 2); 2956 skb_pull(skb, 2); 2957 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2958 eth.h_dest, eth.h_source); 2959 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2960 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2961 2962 return true; 2963 } 2964 #endif 2965 2966 static ieee80211_rx_result 2967 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2968 struct sk_buff *skb) 2969 { 2970 #ifdef CONFIG_MAC80211_MESH 2971 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2972 struct ieee80211_local *local = sdata->local; 2973 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2974 struct ieee80211_hdr hdr = { 2975 .frame_control = cpu_to_le16(fc) 2976 }; 2977 struct ieee80211_hdr *fwd_hdr; 2978 struct ieee80211s_hdr *mesh_hdr; 2979 struct ieee80211_tx_info *info; 2980 struct sk_buff *fwd_skb; 2981 struct ethhdr *eth; 2982 bool multicast; 2983 int tailroom = 0; 2984 int hdrlen, mesh_hdrlen; 2985 u8 *qos; 2986 2987 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2988 return RX_CONTINUE; 2989 2990 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2991 return RX_DROP_U_RUNT_MESH_DATA; 2992 2993 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2994 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2995 2996 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2997 return RX_DROP_U_RUNT_MESH_DATA; 2998 2999 eth = (struct ethhdr *)skb->data; 3000 multicast = is_multicast_ether_addr(eth->h_dest); 3001 3002 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 3003 if (!mesh_hdr->ttl) 3004 return RX_DROP_U_MESH_NO_TTL; 3005 3006 /* frame is in RMC, don't forward */ 3007 if (is_multicast_ether_addr(eth->h_dest) && 3008 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 3009 return RX_DROP_U_MESH_RMC; 3010 3011 /* forward packet */ 3012 if (sdata->crypto_tx_tailroom_needed_cnt) 3013 tailroom = IEEE80211_ENCRYPT_TAILROOM; 3014 3015 if (mesh_hdr->flags & MESH_FLAGS_AE) { 3016 struct mesh_path *mppath; 3017 char *proxied_addr; 3018 bool update = false; 3019 3020 if (multicast) 3021 proxied_addr = mesh_hdr->eaddr1; 3022 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 3023 /* has_a4 already checked in ieee80211_rx_mesh_check */ 3024 proxied_addr = mesh_hdr->eaddr2; 3025 else 3026 return RX_DROP_U_MESH_BAD_AE; 3027 3028 rcu_read_lock(); 3029 mppath = mpp_path_lookup(sdata, proxied_addr); 3030 if (!mppath) { 3031 mpp_path_add(sdata, proxied_addr, eth->h_source); 3032 } else { 3033 spin_lock_bh(&mppath->state_lock); 3034 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 3035 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 3036 update = true; 3037 } 3038 mppath->exp_time = jiffies; 3039 spin_unlock_bh(&mppath->state_lock); 3040 } 3041 3042 /* flush fast xmit cache if the address path changed */ 3043 if (update) 3044 mesh_fast_tx_flush_addr(sdata, proxied_addr); 3045 3046 rcu_read_unlock(); 3047 } 3048 3049 /* Frame has reached destination. Don't forward */ 3050 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 3051 goto rx_accept; 3052 3053 if (!--mesh_hdr->ttl) { 3054 if (multicast) 3055 goto rx_accept; 3056 3057 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 3058 return RX_DROP_U_MESH_TTL_EXPIRED; 3059 } 3060 3061 if (!ifmsh->mshcfg.dot11MeshForwarding) { 3062 if (is_multicast_ether_addr(eth->h_dest)) 3063 goto rx_accept; 3064 3065 return RX_DROP_U_MESH_NOT_FORWARDING; 3066 } 3067 3068 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 3069 3070 if (!multicast && 3071 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 3072 return RX_QUEUED; 3073 3074 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 3075 eth->h_dest, eth->h_source); 3076 hdrlen = ieee80211_hdrlen(hdr.frame_control); 3077 if (multicast) { 3078 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 3079 3080 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 3081 IEEE80211_ENCRYPT_HEADROOM, 3082 tailroom, GFP_ATOMIC); 3083 if (!fwd_skb) 3084 goto rx_accept; 3085 } else { 3086 fwd_skb = skb; 3087 skb = NULL; 3088 3089 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 3090 return RX_DROP_U_OOM; 3091 3092 if (skb_linearize(fwd_skb)) 3093 return RX_DROP_U_OOM; 3094 } 3095 3096 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 3097 memcpy(fwd_hdr, &hdr, hdrlen - 2); 3098 qos = ieee80211_get_qos_ctl(fwd_hdr); 3099 qos[0] = qos[1] = 0; 3100 3101 skb_reset_mac_header(fwd_skb); 3102 hdrlen += mesh_hdrlen; 3103 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 3104 &fwd_skb->protocol)) 3105 hdrlen += ETH_ALEN; 3106 else 3107 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 3108 skb_set_network_header(fwd_skb, hdrlen + 2); 3109 3110 info = IEEE80211_SKB_CB(fwd_skb); 3111 memset(info, 0, sizeof(*info)); 3112 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3113 info->control.vif = &sdata->vif; 3114 info->control.jiffies = jiffies; 3115 fwd_skb->dev = sdata->dev; 3116 if (multicast) { 3117 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 3118 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 3119 /* update power mode indication when forwarding */ 3120 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 3121 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 3122 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3123 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3124 } else { 3125 /* unable to resolve next hop */ 3126 if (sta) 3127 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3128 hdr.addr3, 0, 3129 WLAN_REASON_MESH_PATH_NOFORWARD, 3130 sta->sta.addr); 3131 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3132 kfree_skb(fwd_skb); 3133 goto rx_accept; 3134 } 3135 3136 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3137 ieee80211_set_qos_hdr(sdata, fwd_skb); 3138 ieee80211_add_pending_skb(local, fwd_skb); 3139 3140 rx_accept: 3141 if (!skb) 3142 return RX_QUEUED; 3143 3144 ieee80211_strip_8023_mesh_hdr(skb); 3145 #endif 3146 3147 return RX_CONTINUE; 3148 } 3149 3150 static ieee80211_rx_result debug_noinline 3151 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3152 { 3153 struct net_device *dev = rx->sdata->dev; 3154 struct sk_buff *skb = rx->skb; 3155 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3156 __le16 fc = hdr->frame_control; 3157 struct sk_buff_head frame_list; 3158 struct ethhdr ethhdr; 3159 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3160 3161 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3162 check_da = NULL; 3163 check_sa = NULL; 3164 } else switch (rx->sdata->vif.type) { 3165 case NL80211_IFTYPE_AP: 3166 case NL80211_IFTYPE_AP_VLAN: 3167 check_da = NULL; 3168 break; 3169 case NL80211_IFTYPE_STATION: 3170 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3171 check_sa = NULL; 3172 break; 3173 case NL80211_IFTYPE_MESH_POINT: 3174 check_sa = NULL; 3175 check_da = NULL; 3176 break; 3177 default: 3178 break; 3179 } 3180 3181 skb->dev = dev; 3182 __skb_queue_head_init(&frame_list); 3183 3184 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3185 rx->sdata->vif.addr, 3186 rx->sdata->vif.type, 3187 data_offset, true)) 3188 return RX_DROP_U_BAD_AMSDU; 3189 3190 if (rx->sta->amsdu_mesh_control < 0) { 3191 s8 valid = -1; 3192 int i; 3193 3194 for (i = 0; i <= 2; i++) { 3195 if (!ieee80211_is_valid_amsdu(skb, i)) 3196 continue; 3197 3198 if (valid >= 0) { 3199 /* ambiguous */ 3200 valid = -1; 3201 break; 3202 } 3203 3204 valid = i; 3205 } 3206 3207 rx->sta->amsdu_mesh_control = valid; 3208 } 3209 3210 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3211 rx->sdata->vif.type, 3212 rx->local->hw.extra_tx_headroom, 3213 check_da, check_sa, 3214 rx->sta->amsdu_mesh_control); 3215 3216 while (!skb_queue_empty(&frame_list)) { 3217 rx->skb = __skb_dequeue(&frame_list); 3218 3219 switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) { 3220 case RX_QUEUED: 3221 break; 3222 case RX_CONTINUE: 3223 if (ieee80211_frame_allowed(rx, fc)) { 3224 ieee80211_deliver_skb(rx); 3225 break; 3226 } 3227 fallthrough; 3228 default: 3229 dev_kfree_skb(rx->skb); 3230 } 3231 } 3232 3233 return RX_QUEUED; 3234 } 3235 3236 static ieee80211_rx_result debug_noinline 3237 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3238 { 3239 struct sk_buff *skb = rx->skb; 3240 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3242 __le16 fc = hdr->frame_control; 3243 3244 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3245 return RX_CONTINUE; 3246 3247 if (unlikely(!ieee80211_is_data(fc))) 3248 return RX_CONTINUE; 3249 3250 if (unlikely(!ieee80211_is_data_present(fc))) 3251 return RX_DROP_U_AMSDU_WITHOUT_DATA; 3252 3253 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3254 switch (rx->sdata->vif.type) { 3255 case NL80211_IFTYPE_AP_VLAN: 3256 if (!rx->sdata->u.vlan.sta) 3257 return RX_DROP_U_BAD_4ADDR; 3258 break; 3259 case NL80211_IFTYPE_STATION: 3260 if (!rx->sdata->u.mgd.use_4addr) 3261 return RX_DROP_U_BAD_4ADDR; 3262 break; 3263 case NL80211_IFTYPE_MESH_POINT: 3264 break; 3265 default: 3266 return RX_DROP_U_BAD_4ADDR; 3267 } 3268 } 3269 3270 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3271 return RX_DROP_U_BAD_AMSDU; 3272 3273 if (rx->key) { 3274 /* 3275 * We should not receive A-MSDUs on pre-HT connections, 3276 * and HT connections cannot use old ciphers. Thus drop 3277 * them, as in those cases we couldn't even have SPP 3278 * A-MSDUs or such. 3279 */ 3280 switch (rx->key->conf.cipher) { 3281 case WLAN_CIPHER_SUITE_WEP40: 3282 case WLAN_CIPHER_SUITE_WEP104: 3283 case WLAN_CIPHER_SUITE_TKIP: 3284 return RX_DROP_U_BAD_AMSDU_CIPHER; 3285 default: 3286 break; 3287 } 3288 } 3289 3290 return __ieee80211_rx_h_amsdu(rx, 0); 3291 } 3292 3293 static ieee80211_rx_result debug_noinline 3294 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3295 { 3296 struct ieee80211_sub_if_data *sdata = rx->sdata; 3297 struct ieee80211_local *local = rx->local; 3298 struct net_device *dev = sdata->dev; 3299 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3300 __le16 fc = hdr->frame_control; 3301 ieee80211_rx_result res; 3302 bool port_control; 3303 3304 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3305 return RX_CONTINUE; 3306 3307 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3308 return RX_DROP_U_NULL_DATA; 3309 3310 /* Send unexpected-4addr-frame event to hostapd */ 3311 if (ieee80211_has_a4(hdr->frame_control) && 3312 sdata->vif.type == NL80211_IFTYPE_AP) { 3313 if (rx->sta && 3314 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3315 cfg80211_rx_unexpected_4addr_frame( 3316 rx->sdata->dev, rx->sta->sta.addr, rx->link_id, 3317 GFP_ATOMIC); 3318 return RX_DROP_U_UNEXPECTED_4ADDR; 3319 } 3320 3321 res = __ieee80211_data_to_8023(rx, &port_control); 3322 if (unlikely(res != RX_CONTINUE)) 3323 return res; 3324 3325 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3326 if (res != RX_CONTINUE) 3327 return res; 3328 3329 if (!ieee80211_frame_allowed(rx, fc)) 3330 return RX_DROP_U_PORT_CONTROL; 3331 3332 /* directly handle TDLS channel switch requests/responses */ 3333 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3334 cpu_to_be16(ETH_P_TDLS))) { 3335 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3336 3337 if (pskb_may_pull(rx->skb, 3338 offsetof(struct ieee80211_tdls_data, u)) && 3339 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3340 tf->category == WLAN_CATEGORY_TDLS && 3341 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3342 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3343 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3344 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3345 rx->sta, rx->skb); 3346 return RX_QUEUED; 3347 } 3348 } 3349 3350 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3351 unlikely(port_control) && sdata->bss) { 3352 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3353 u.ap); 3354 dev = sdata->dev; 3355 rx->sdata = sdata; 3356 } 3357 3358 rx->skb->dev = dev; 3359 3360 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3361 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3362 !is_multicast_ether_addr( 3363 ((struct ethhdr *)rx->skb->data)->h_dest) && 3364 (!local->scanning && 3365 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3366 mod_timer(&local->dynamic_ps_timer, jiffies + 3367 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3368 3369 ieee80211_deliver_skb(rx); 3370 3371 return RX_QUEUED; 3372 } 3373 3374 static ieee80211_rx_result debug_noinline 3375 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3376 { 3377 struct sk_buff *skb = rx->skb; 3378 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3379 struct tid_ampdu_rx *tid_agg_rx; 3380 u16 start_seq_num; 3381 u16 tid; 3382 3383 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3384 return RX_CONTINUE; 3385 3386 if (ieee80211_is_back_req(bar->frame_control)) { 3387 struct { 3388 __le16 control, start_seq_num; 3389 } __packed bar_data; 3390 struct ieee80211_event event = { 3391 .type = BAR_RX_EVENT, 3392 }; 3393 3394 if (!rx->sta) 3395 return RX_DROP_U_UNKNOWN_STA; 3396 3397 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3398 &bar_data, sizeof(bar_data))) 3399 return RX_DROP_U_RUNT_BAR; 3400 3401 tid = le16_to_cpu(bar_data.control) >> 12; 3402 3403 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3404 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3405 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3406 WLAN_BACK_RECIPIENT, 3407 WLAN_REASON_QSTA_REQUIRE_SETUP, 3408 ieee80211_s1g_use_ndp_ba(rx->sdata, 3409 rx->sta)); 3410 3411 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3412 if (!tid_agg_rx) 3413 return RX_DROP_U_BAR_OUTSIDE_SESSION; 3414 3415 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3416 event.u.ba.tid = tid; 3417 event.u.ba.ssn = start_seq_num; 3418 event.u.ba.sta = &rx->sta->sta; 3419 3420 /* reset session timer */ 3421 if (tid_agg_rx->timeout) 3422 mod_timer(&tid_agg_rx->session_timer, 3423 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3424 3425 spin_lock(&tid_agg_rx->reorder_lock); 3426 /* release stored frames up to start of BAR */ 3427 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3428 start_seq_num, frames); 3429 spin_unlock(&tid_agg_rx->reorder_lock); 3430 3431 drv_event_callback(rx->local, rx->sdata, &event); 3432 3433 kfree_skb(skb); 3434 return RX_QUEUED; 3435 } 3436 3437 return RX_DROP_U_CTRL_FRAME; 3438 } 3439 3440 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3441 struct ieee80211_mgmt *mgmt, 3442 size_t len) 3443 { 3444 struct ieee80211_local *local = sdata->local; 3445 struct sk_buff *skb; 3446 struct ieee80211_mgmt *resp; 3447 3448 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3449 /* Not to own unicast address */ 3450 return; 3451 } 3452 3453 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3454 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3455 /* Not from the current AP or not associated yet. */ 3456 return; 3457 } 3458 3459 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) { 3460 /* Too short SA Query request frame */ 3461 return; 3462 } 3463 3464 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3465 if (skb == NULL) 3466 return; 3467 3468 skb_reserve(skb, local->hw.extra_tx_headroom); 3469 resp = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(sa_query)); 3470 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3471 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3472 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3473 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3474 IEEE80211_STYPE_ACTION); 3475 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3476 resp->u.action.action_code = WLAN_ACTION_SA_QUERY_RESPONSE; 3477 memcpy(resp->u.action.sa_query.trans_id, 3478 mgmt->u.action.sa_query.trans_id, 3479 WLAN_SA_QUERY_TR_ID_LEN); 3480 3481 ieee80211_tx_skb(sdata, skb); 3482 } 3483 3484 static void 3485 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3486 { 3487 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3488 struct ieee80211_bss_conf *bss_conf; 3489 const struct element *ie; 3490 size_t baselen; 3491 3492 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3493 NL80211_EXT_FEATURE_BSS_COLOR)) 3494 return; 3495 3496 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3497 return; 3498 3499 bss_conf = rx->link->conf; 3500 if (bss_conf->csa_active || bss_conf->color_change_active || 3501 !bss_conf->he_bss_color.enabled) 3502 return; 3503 3504 baselen = mgmt->u.beacon.variable - rx->skb->data; 3505 if (baselen > rx->skb->len) 3506 return; 3507 3508 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3509 mgmt->u.beacon.variable, 3510 rx->skb->len - baselen); 3511 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3512 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3513 const struct ieee80211_he_operation *he_oper; 3514 u8 color; 3515 3516 he_oper = (void *)(ie->data + 1); 3517 if (le32_get_bits(he_oper->he_oper_params, 3518 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3519 return; 3520 3521 color = le32_get_bits(he_oper->he_oper_params, 3522 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3523 if (color == bss_conf->he_bss_color.color) 3524 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3525 BIT_ULL(color), 3526 bss_conf->link_id); 3527 } 3528 } 3529 3530 static ieee80211_rx_result debug_noinline 3531 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3532 { 3533 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3534 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3535 3536 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3537 return RX_CONTINUE; 3538 3539 /* 3540 * From here on, look only at management frames. 3541 * Data and control frames are already handled, 3542 * and unknown (reserved) frames are useless. 3543 */ 3544 if (rx->skb->len < 24) 3545 return RX_DROP_U_RUNT_MGMT; 3546 3547 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3548 return RX_DROP_U_EXPECTED_MGMT; 3549 3550 /* drop too small action frames */ 3551 if (ieee80211_is_action(mgmt->frame_control) && 3552 rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category)) 3553 return RX_DROP_U_RUNT_ACTION; 3554 3555 /* Drop non-broadcast Beacon frames */ 3556 if (ieee80211_is_beacon(mgmt->frame_control) && 3557 !is_broadcast_ether_addr(mgmt->da)) 3558 return RX_DROP_U_NONBCAST_BEACON; 3559 3560 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3561 ieee80211_is_beacon(mgmt->frame_control) && 3562 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3563 int sig = 0; 3564 3565 /* sw bss color collision detection */ 3566 ieee80211_rx_check_bss_color_collision(rx); 3567 3568 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3569 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3570 sig = status->signal; 3571 3572 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3573 rx->skb->data, rx->skb->len, 3574 ieee80211_rx_status_to_khz(status), 3575 sig); 3576 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3577 } 3578 3579 return ieee80211_drop_unencrypted_mgmt(rx); 3580 } 3581 3582 static bool 3583 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3584 { 3585 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3586 struct ieee80211_sub_if_data *sdata = rx->sdata; 3587 3588 /* TWT actions are only supported in AP for the moment */ 3589 if (sdata->vif.type != NL80211_IFTYPE_AP) 3590 return false; 3591 3592 if (!rx->local->ops->add_twt_setup) 3593 return false; 3594 3595 if (!sdata->vif.bss_conf.twt_responder) 3596 return false; 3597 3598 if (!rx->sta) 3599 return false; 3600 3601 switch (mgmt->u.action.action_code) { 3602 case WLAN_S1G_TWT_SETUP: { 3603 struct ieee80211_twt_setup *twt; 3604 3605 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3606 sizeof(struct ieee80211_twt_setup) + 3607 2 /* TWT req_type agrt */) 3608 break; 3609 3610 twt = (void *)mgmt->u.action.s1g.variable; 3611 if (twt->element_id != WLAN_EID_S1G_TWT) 3612 break; 3613 3614 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3615 3 + /* token + tlv */ 3616 twt->length) 3617 break; 3618 3619 return true; /* queue the frame */ 3620 } 3621 case WLAN_S1G_TWT_TEARDOWN: 3622 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 1) 3623 break; 3624 3625 return true; /* queue the frame */ 3626 default: 3627 break; 3628 } 3629 3630 return false; 3631 } 3632 3633 static ieee80211_rx_result debug_noinline 3634 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3635 { 3636 struct ieee80211_local *local = rx->local; 3637 struct ieee80211_sub_if_data *sdata = rx->sdata; 3638 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3639 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3640 int len = rx->skb->len; 3641 3642 if (!ieee80211_is_action(mgmt->frame_control)) 3643 return RX_CONTINUE; 3644 3645 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3646 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3647 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3648 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3649 3650 switch (mgmt->u.action.category) { 3651 case WLAN_CATEGORY_HT: 3652 /* reject HT action frames from stations not supporting HT 3653 * or not HE Capable 3654 */ 3655 if (!rx->link_sta->pub->ht_cap.ht_supported && 3656 !rx->link_sta->pub->he_cap.has_he) 3657 goto invalid; 3658 3659 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3660 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3661 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3662 sdata->vif.type != NL80211_IFTYPE_AP && 3663 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3664 break; 3665 3666 /* verify action & smps_control/chanwidth are present */ 3667 if (len < IEEE80211_MIN_ACTION_SIZE(ht_smps)) 3668 goto invalid; 3669 3670 switch (mgmt->u.action.action_code) { 3671 case WLAN_HT_ACTION_SMPS: { 3672 struct ieee80211_supported_band *sband; 3673 enum ieee80211_smps_mode smps_mode; 3674 struct sta_opmode_info sta_opmode = {}; 3675 3676 if (sdata->vif.type != NL80211_IFTYPE_AP && 3677 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3678 goto handled; 3679 3680 /* convert to HT capability */ 3681 switch (mgmt->u.action.ht_smps.smps_control) { 3682 case WLAN_HT_SMPS_CONTROL_DISABLED: 3683 smps_mode = IEEE80211_SMPS_OFF; 3684 break; 3685 case WLAN_HT_SMPS_CONTROL_STATIC: 3686 smps_mode = IEEE80211_SMPS_STATIC; 3687 break; 3688 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3689 smps_mode = IEEE80211_SMPS_DYNAMIC; 3690 break; 3691 default: 3692 goto invalid; 3693 } 3694 3695 /* if no change do nothing */ 3696 if (rx->link_sta->pub->smps_mode == smps_mode) 3697 goto handled; 3698 rx->link_sta->pub->smps_mode = smps_mode; 3699 sta_opmode.smps_mode = 3700 ieee80211_smps_mode_to_smps_mode(smps_mode); 3701 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3702 3703 sband = rx->local->hw.wiphy->bands[status->band]; 3704 3705 rate_control_rate_update(local, sband, rx->link_sta, 3706 IEEE80211_RC_SMPS_CHANGED); 3707 cfg80211_sta_opmode_change_notify(sdata->dev, 3708 rx->sta->addr, 3709 &sta_opmode, 3710 GFP_ATOMIC); 3711 goto handled; 3712 } 3713 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3714 u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth; 3715 3716 if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ && 3717 chanwidth != IEEE80211_HT_CHANWIDTH_ANY) 3718 goto invalid; 3719 3720 /* If it doesn't support 40 MHz it can't change ... */ 3721 if (!(rx->link_sta->pub->ht_cap.cap & 3722 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3723 goto handled; 3724 3725 goto queue; 3726 } 3727 default: 3728 goto invalid; 3729 } 3730 3731 break; 3732 case WLAN_CATEGORY_PUBLIC: 3733 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3734 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3735 goto invalid; 3736 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3737 break; 3738 if (!rx->sta) 3739 break; 3740 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3741 break; 3742 if (mgmt->u.action.action_code != 3743 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3744 break; 3745 if (len < IEEE80211_MIN_ACTION_SIZE(ext_chan_switch)) 3746 goto invalid; 3747 goto queue; 3748 case WLAN_CATEGORY_VHT: 3749 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3750 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3751 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3752 sdata->vif.type != NL80211_IFTYPE_AP && 3753 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3754 break; 3755 3756 /* verify action code is present */ 3757 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3758 goto invalid; 3759 3760 switch (mgmt->u.action.action_code) { 3761 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3762 /* verify opmode is present */ 3763 if (len < IEEE80211_MIN_ACTION_SIZE(vht_opmode_notif)) 3764 goto invalid; 3765 goto queue; 3766 } 3767 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3768 if (len < IEEE80211_MIN_ACTION_SIZE(vht_group_notif)) 3769 goto invalid; 3770 goto queue; 3771 } 3772 default: 3773 break; 3774 } 3775 break; 3776 case WLAN_CATEGORY_BACK: 3777 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3778 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3779 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3780 sdata->vif.type != NL80211_IFTYPE_AP && 3781 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3782 sdata->vif.type != NL80211_IFTYPE_NAN_DATA) 3783 break; 3784 3785 /* verify action_code is present */ 3786 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3787 break; 3788 3789 switch (mgmt->u.action.action_code) { 3790 case WLAN_ACTION_ADDBA_REQ: 3791 case WLAN_ACTION_NDP_ADDBA_REQ: 3792 if (len < IEEE80211_MIN_ACTION_SIZE(addba_req)) 3793 goto invalid; 3794 break; 3795 case WLAN_ACTION_ADDBA_RESP: 3796 case WLAN_ACTION_NDP_ADDBA_RESP: 3797 if (len < IEEE80211_MIN_ACTION_SIZE(addba_resp)) 3798 goto invalid; 3799 break; 3800 case WLAN_ACTION_DELBA: 3801 case WLAN_ACTION_NDP_DELBA: 3802 if (len < IEEE80211_MIN_ACTION_SIZE(delba)) 3803 goto invalid; 3804 break; 3805 default: 3806 goto invalid; 3807 } 3808 3809 goto queue; 3810 case WLAN_CATEGORY_SPECTRUM_MGMT: 3811 /* verify action_code is present */ 3812 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3813 break; 3814 3815 switch (mgmt->u.action.action_code) { 3816 case WLAN_ACTION_SPCT_MSR_REQ: 3817 if (status->band != NL80211_BAND_5GHZ) 3818 break; 3819 3820 if (len < IEEE80211_MIN_ACTION_SIZE(measurement)) 3821 break; 3822 3823 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3824 break; 3825 3826 ieee80211_process_measurement_req(sdata, mgmt, len); 3827 goto handled; 3828 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3829 u8 *bssid; 3830 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 3831 break; 3832 3833 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3834 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3835 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3836 break; 3837 3838 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3839 bssid = sdata->deflink.u.mgd.bssid; 3840 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3841 bssid = sdata->u.ibss.bssid; 3842 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3843 bssid = mgmt->sa; 3844 else 3845 break; 3846 3847 if (!ether_addr_equal(mgmt->bssid, bssid)) 3848 break; 3849 3850 goto queue; 3851 } 3852 } 3853 break; 3854 case WLAN_CATEGORY_SELF_PROTECTED: 3855 if (len < IEEE80211_MIN_ACTION_SIZE(self_prot)) 3856 break; 3857 3858 switch (mgmt->u.action.action_code) { 3859 case WLAN_SP_MESH_PEERING_OPEN: 3860 case WLAN_SP_MESH_PEERING_CLOSE: 3861 case WLAN_SP_MESH_PEERING_CONFIRM: 3862 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3863 goto invalid; 3864 if (sdata->u.mesh.user_mpm) 3865 /* userspace handles this frame */ 3866 break; 3867 goto queue; 3868 case WLAN_SP_MGK_INFORM: 3869 case WLAN_SP_MGK_ACK: 3870 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3871 goto invalid; 3872 break; 3873 } 3874 break; 3875 case WLAN_CATEGORY_MESH_ACTION: 3876 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3877 break; 3878 3879 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3880 break; 3881 if (mesh_action_is_path_sel(mgmt) && 3882 !mesh_path_sel_is_hwmp(sdata)) 3883 break; 3884 goto queue; 3885 case WLAN_CATEGORY_S1G: 3886 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3887 break; 3888 3889 switch (mgmt->u.action.action_code) { 3890 case WLAN_S1G_TWT_SETUP: 3891 case WLAN_S1G_TWT_TEARDOWN: 3892 if (ieee80211_process_rx_twt_action(rx)) 3893 goto queue; 3894 break; 3895 default: 3896 break; 3897 } 3898 break; 3899 case WLAN_CATEGORY_PROTECTED_EHT: 3900 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3901 break; 3902 3903 switch (mgmt->u.action.action_code) { 3904 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3905 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3906 break; 3907 3908 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_req)) 3909 goto invalid; 3910 goto queue; 3911 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3912 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3913 break; 3914 3915 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_res)) 3916 goto invalid; 3917 goto queue; 3918 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3919 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3920 break; 3921 3922 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_tear_down)) 3923 goto invalid; 3924 goto queue; 3925 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3926 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3927 break; 3928 3929 /* The reconfiguration response action frame must 3930 * least one 'Status Duple' entry (3 octets) 3931 */ 3932 if (len < IEEE80211_MIN_ACTION_SIZE(ml_reconf_resp) + 3) 3933 goto invalid; 3934 goto queue; 3935 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3936 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3937 break; 3938 3939 if (len < IEEE80211_MIN_ACTION_SIZE(epcs) + 3940 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3941 goto invalid; 3942 goto queue; 3943 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3944 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3945 break; 3946 3947 if (len < IEEE80211_MIN_ACTION_SIZE(epcs)) 3948 goto invalid; 3949 goto queue; 3950 case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF: 3951 if (sdata->vif.type != NL80211_IFTYPE_AP) 3952 break; 3953 3954 if (len < IEEE80211_MIN_ACTION_SIZE(eml_omn)) 3955 goto invalid; 3956 goto queue; 3957 default: 3958 break; 3959 } 3960 break; 3961 case WLAN_CATEGORY_PROTECTED_UHR: 3962 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3963 break; 3964 3965 switch (mgmt->u.action.action_code) { 3966 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_REQUEST: 3967 if (sdata->vif.type != NL80211_IFTYPE_AP) 3968 break; 3969 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_req)) 3970 goto invalid; 3971 if (mgmt->u.action.uhr_link_reconf_req.type != 3972 IEEE80211_UHR_LINK_RECONFIG_REQUEST_OMP_REQUEST) 3973 break; 3974 goto queue; 3975 case IEEE80211_PROTECTED_UHR_ACTION_LINK_RECONFIG_NOTIFY: 3976 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3977 break; 3978 3979 if (len < IEEE80211_MIN_ACTION_SIZE(uhr_link_reconf_notif)) 3980 goto invalid; 3981 goto queue; 3982 } 3983 break; 3984 } 3985 3986 return RX_CONTINUE; 3987 3988 invalid: 3989 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3990 /* will return in the next handlers */ 3991 return RX_CONTINUE; 3992 3993 handled: 3994 if (rx->sta) 3995 rx->link_sta->rx_stats.packets++; 3996 dev_kfree_skb(rx->skb); 3997 return RX_QUEUED; 3998 3999 queue: 4000 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4001 return RX_QUEUED; 4002 } 4003 4004 static ieee80211_rx_result debug_noinline 4005 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 4006 { 4007 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4008 struct cfg80211_rx_info info = { 4009 .freq = ieee80211_rx_status_to_khz(status), 4010 .buf = rx->skb->data, 4011 .len = rx->skb->len, 4012 .link_id = rx->link_id, 4013 .have_link_id = rx->link_id >= 0, 4014 }; 4015 4016 /* skip known-bad action frames and return them in the next handler */ 4017 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 4018 return RX_CONTINUE; 4019 4020 /* 4021 * Getting here means the kernel doesn't know how to handle 4022 * it, but maybe userspace does ... include returned frames 4023 * so userspace can register for those to know whether ones 4024 * it transmitted were processed or returned. 4025 */ 4026 4027 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 4028 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 4029 info.sig_dbm = status->signal; 4030 4031 if (ieee80211_is_timing_measurement(rx->skb) || 4032 ieee80211_is_ftm(rx->skb)) { 4033 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 4034 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 4035 } 4036 4037 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 4038 if (rx->sta) 4039 rx->link_sta->rx_stats.packets++; 4040 dev_kfree_skb(rx->skb); 4041 return RX_QUEUED; 4042 } 4043 4044 return RX_CONTINUE; 4045 } 4046 4047 static ieee80211_rx_result debug_noinline 4048 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 4049 { 4050 struct ieee80211_sub_if_data *sdata = rx->sdata; 4051 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4052 int len = rx->skb->len; 4053 4054 if (!ieee80211_is_action(mgmt->frame_control)) 4055 return RX_CONTINUE; 4056 4057 switch (mgmt->u.action.category) { 4058 case WLAN_CATEGORY_SA_QUERY: 4059 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) 4060 break; 4061 4062 switch (mgmt->u.action.action_code) { 4063 case WLAN_ACTION_SA_QUERY_REQUEST: 4064 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4065 break; 4066 ieee80211_process_sa_query_req(sdata, mgmt, len); 4067 goto handled; 4068 } 4069 break; 4070 } 4071 4072 return RX_CONTINUE; 4073 4074 handled: 4075 if (rx->sta) 4076 rx->link_sta->rx_stats.packets++; 4077 dev_kfree_skb(rx->skb); 4078 return RX_QUEUED; 4079 } 4080 4081 static ieee80211_rx_result debug_noinline 4082 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 4083 { 4084 struct ieee80211_local *local = rx->local; 4085 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4086 struct sk_buff *nskb; 4087 struct ieee80211_sub_if_data *sdata = rx->sdata; 4088 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4089 4090 if (!ieee80211_is_action(mgmt->frame_control)) 4091 return RX_CONTINUE; 4092 4093 /* 4094 * For AP mode, hostapd is responsible for handling any action 4095 * frames that we didn't handle, including returning unknown 4096 * ones. For all other modes we will return them to the sender, 4097 * setting the 0x80 bit in the action category, as required by 4098 * 802.11-2012 9.24.4. 4099 * Newer versions of hostapd use the management frame registration 4100 * mechanisms and old cooked monitor interface is no longer supported. 4101 */ 4102 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 4103 (sdata->vif.type == NL80211_IFTYPE_AP || 4104 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 4105 return RX_DROP_U_MALFORMED_ACTION; 4106 4107 if (is_multicast_ether_addr(mgmt->da)) 4108 return RX_DROP_U_UNKNOWN_MCAST_ACTION; 4109 4110 /* do not return rejected action frames */ 4111 if (mgmt->u.action.category & 0x80) 4112 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 4113 4114 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 4115 GFP_ATOMIC); 4116 if (nskb) { 4117 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 4118 4119 nmgmt->u.action.category |= 0x80; 4120 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 4121 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 4122 4123 memset(nskb->cb, 0, sizeof(nskb->cb)); 4124 4125 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 4126 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 4127 4128 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 4129 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 4130 IEEE80211_TX_CTL_NO_CCK_RATE; 4131 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 4132 info->hw_queue = 4133 local->hw.offchannel_tx_hw_queue; 4134 } 4135 4136 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 4137 status->band); 4138 } 4139 4140 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 4141 } 4142 4143 static ieee80211_rx_result debug_noinline 4144 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 4145 { 4146 struct ieee80211_sub_if_data *sdata = rx->sdata; 4147 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4148 4149 if (!ieee80211_is_ext(hdr->frame_control)) 4150 return RX_CONTINUE; 4151 4152 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4153 return RX_DROP_U_UNEXPECTED_EXT_FRAME; 4154 4155 /* for now only beacons are ext, so queue them */ 4156 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4157 4158 return RX_QUEUED; 4159 } 4160 4161 static ieee80211_rx_result debug_noinline 4162 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4163 { 4164 struct ieee80211_sub_if_data *sdata = rx->sdata; 4165 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4166 __le16 stype; 4167 4168 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4169 4170 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4171 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4172 sdata->vif.type != NL80211_IFTYPE_OCB && 4173 sdata->vif.type != NL80211_IFTYPE_STATION) 4174 return RX_DROP_U_UNHANDLED_MGMT; 4175 4176 switch (stype) { 4177 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4178 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4179 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4180 /* process for all: mesh, mlme, ibss */ 4181 break; 4182 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4183 if (is_multicast_ether_addr(mgmt->da) && 4184 !is_broadcast_ether_addr(mgmt->da)) 4185 return RX_DROP_U_MCAST_DEAUTH; 4186 4187 /* process only for station/IBSS */ 4188 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4189 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4190 return RX_DROP_U_UNHANDLED_DEAUTH; 4191 break; 4192 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4193 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4194 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4195 if (is_multicast_ether_addr(mgmt->da) && 4196 !is_broadcast_ether_addr(mgmt->da)) 4197 return RX_DROP_U_MCAST_DISASSOC; 4198 4199 /* process only for station */ 4200 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4201 return RX_DROP_U_UNHANDLED_DISASSOC; 4202 break; 4203 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4204 /* process only for ibss and mesh */ 4205 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4206 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4207 return RX_DROP_U_UNHANDLED_PREQ; 4208 break; 4209 default: 4210 return RX_DROP_U_UNHANDLED_MGMT_STYPE; 4211 } 4212 4213 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4214 4215 return RX_QUEUED; 4216 } 4217 4218 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4219 ieee80211_rx_result res) 4220 { 4221 if (res == RX_QUEUED) { 4222 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4223 return; 4224 } 4225 4226 if (res != RX_CONTINUE) { 4227 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4228 if (rx->sta) 4229 rx->link_sta->rx_stats.dropped++; 4230 } 4231 4232 kfree_skb_reason(rx->skb, (__force u32)res); 4233 } 4234 4235 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4236 struct sk_buff_head *frames) 4237 { 4238 ieee80211_rx_result res; 4239 struct sk_buff *skb; 4240 4241 #define CALL_RXH(rxh) \ 4242 do { \ 4243 res = rxh(rx); \ 4244 if (res != RX_CONTINUE) \ 4245 goto rxh_next; \ 4246 } while (0) 4247 4248 /* Lock here to avoid hitting all of the data used in the RX 4249 * path (e.g. key data, station data, ...) concurrently when 4250 * a frame is released from the reorder buffer due to timeout 4251 * from the timer, potentially concurrently with RX from the 4252 * driver. 4253 */ 4254 spin_lock_bh(&rx->local->rx_path_lock); 4255 4256 while ((skb = __skb_dequeue(frames))) { 4257 /* 4258 * all the other fields are valid across frames 4259 * that belong to an aMPDU since they are on the 4260 * same TID from the same station 4261 */ 4262 rx->skb = skb; 4263 4264 if (WARN_ON_ONCE(!rx->link)) { 4265 res = RX_DROP_U_NO_LINK; 4266 goto rxh_next; 4267 } 4268 4269 CALL_RXH(ieee80211_rx_h_check_more_data); 4270 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4271 CALL_RXH(ieee80211_rx_h_sta_process); 4272 CALL_RXH(ieee80211_rx_h_decrypt); 4273 CALL_RXH(ieee80211_rx_h_defragment); 4274 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4275 /* must be after MMIC verify so header is counted in MPDU mic */ 4276 CALL_RXH(ieee80211_rx_h_amsdu); 4277 CALL_RXH(ieee80211_rx_h_data); 4278 4279 /* special treatment -- needs the queue */ 4280 res = ieee80211_rx_h_ctrl(rx, frames); 4281 if (res != RX_CONTINUE) 4282 goto rxh_next; 4283 4284 CALL_RXH(ieee80211_rx_h_mgmt_check); 4285 CALL_RXH(ieee80211_rx_h_action); 4286 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4287 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4288 CALL_RXH(ieee80211_rx_h_action_return); 4289 CALL_RXH(ieee80211_rx_h_ext); 4290 CALL_RXH(ieee80211_rx_h_mgmt); 4291 4292 rxh_next: 4293 ieee80211_rx_handlers_result(rx, res); 4294 4295 #undef CALL_RXH 4296 } 4297 4298 spin_unlock_bh(&rx->local->rx_path_lock); 4299 } 4300 4301 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4302 { 4303 struct sk_buff_head reorder_release; 4304 ieee80211_rx_result res; 4305 4306 __skb_queue_head_init(&reorder_release); 4307 4308 #define CALL_RXH(rxh) \ 4309 do { \ 4310 res = rxh(rx); \ 4311 if (res != RX_CONTINUE) \ 4312 goto rxh_next; \ 4313 } while (0) 4314 4315 CALL_RXH(ieee80211_rx_h_check_dup); 4316 CALL_RXH(ieee80211_rx_h_check); 4317 4318 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4319 4320 ieee80211_rx_handlers(rx, &reorder_release); 4321 return; 4322 4323 rxh_next: 4324 ieee80211_rx_handlers_result(rx, res); 4325 4326 #undef CALL_RXH 4327 } 4328 4329 static bool 4330 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4331 { 4332 return !!(sta->valid_links & BIT(link_id)); 4333 } 4334 4335 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4336 u8 link_id) 4337 { 4338 rx->link_id = link_id; 4339 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4340 4341 if (!rx->sta) 4342 return rx->link; 4343 4344 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4345 return false; 4346 4347 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4348 4349 return rx->link && rx->link_sta; 4350 } 4351 4352 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4353 struct sta_info *sta, int link_id) 4354 { 4355 rx->link_id = link_id; 4356 rx->sta = sta; 4357 4358 if (sta) { 4359 rx->local = sta->sdata->local; 4360 if (!rx->sdata) 4361 rx->sdata = sta->sdata; 4362 rx->link_sta = &sta->deflink; 4363 } else { 4364 rx->link_sta = NULL; 4365 } 4366 4367 if (link_id < 0) { 4368 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4369 sta && !sta->sta.valid_links) 4370 rx->link = 4371 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4372 else 4373 rx->link = &rx->sdata->deflink; 4374 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4375 return false; 4376 } 4377 4378 return true; 4379 } 4380 4381 /* 4382 * This function makes calls into the RX path, therefore 4383 * it has to be invoked under RCU read lock. 4384 */ 4385 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4386 { 4387 struct sk_buff_head frames; 4388 struct ieee80211_rx_data rx = { 4389 /* This is OK -- must be QoS data frame */ 4390 .security_idx = tid, 4391 .seqno_idx = tid, 4392 }; 4393 struct tid_ampdu_rx *tid_agg_rx; 4394 int link_id = -1; 4395 4396 /* FIXME: statistics won't be right with this */ 4397 if (sta->sta.valid_links) 4398 link_id = ffs(sta->sta.valid_links) - 1; 4399 4400 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4401 return; 4402 4403 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4404 if (!tid_agg_rx) 4405 return; 4406 4407 __skb_queue_head_init(&frames); 4408 4409 spin_lock(&tid_agg_rx->reorder_lock); 4410 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4411 spin_unlock(&tid_agg_rx->reorder_lock); 4412 4413 if (!skb_queue_empty(&frames)) { 4414 struct ieee80211_event event = { 4415 .type = BA_FRAME_TIMEOUT, 4416 .u.ba.tid = tid, 4417 .u.ba.sta = &sta->sta, 4418 }; 4419 drv_event_callback(rx.local, rx.sdata, &event); 4420 } 4421 4422 ieee80211_rx_handlers(&rx, &frames); 4423 } 4424 4425 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4426 u16 ssn, u64 filtered, 4427 u16 received_mpdus) 4428 { 4429 struct ieee80211_local *local; 4430 struct sta_info *sta; 4431 struct tid_ampdu_rx *tid_agg_rx; 4432 struct sk_buff_head frames; 4433 struct ieee80211_rx_data rx = { 4434 /* This is OK -- must be QoS data frame */ 4435 .security_idx = tid, 4436 .seqno_idx = tid, 4437 }; 4438 int i, diff; 4439 4440 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4441 return; 4442 4443 __skb_queue_head_init(&frames); 4444 4445 sta = container_of(pubsta, struct sta_info, sta); 4446 4447 local = sta->sdata->local; 4448 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4449 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4450 local->hw.max_rx_aggregation_subframes); 4451 4452 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4453 return; 4454 4455 rcu_read_lock(); 4456 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4457 if (!tid_agg_rx) 4458 goto out; 4459 4460 spin_lock_bh(&tid_agg_rx->reorder_lock); 4461 4462 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4463 int release; 4464 4465 /* release all frames in the reorder buffer */ 4466 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4467 IEEE80211_SN_MODULO; 4468 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4469 release, &frames); 4470 /* update ssn to match received ssn */ 4471 tid_agg_rx->head_seq_num = ssn; 4472 } else { 4473 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4474 &frames); 4475 } 4476 4477 /* handle the case that received ssn is behind the mac ssn. 4478 * it can be tid_agg_rx->buf_size behind and still be valid */ 4479 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4480 if (diff >= tid_agg_rx->buf_size) { 4481 tid_agg_rx->reorder_buf_filtered = 0; 4482 goto release; 4483 } 4484 filtered = filtered >> diff; 4485 ssn += diff; 4486 4487 /* update bitmap */ 4488 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4489 int index = (ssn + i) % tid_agg_rx->buf_size; 4490 4491 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4492 if (filtered & BIT_ULL(i)) 4493 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4494 } 4495 4496 /* now process also frames that the filter marking released */ 4497 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4498 4499 release: 4500 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4501 4502 ieee80211_rx_handlers(&rx, &frames); 4503 4504 out: 4505 rcu_read_unlock(); 4506 } 4507 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4508 4509 /* main receive path */ 4510 4511 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4512 { 4513 return ether_addr_equal(raddr, addr) || 4514 is_broadcast_ether_addr(raddr); 4515 } 4516 4517 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4518 { 4519 struct ieee80211_sub_if_data *sdata = rx->sdata; 4520 struct sk_buff *skb = rx->skb; 4521 struct ieee80211_hdr *hdr = (void *)skb->data; 4522 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4523 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4524 bool multicast; 4525 static const u8 nan_network_id[ETH_ALEN] __aligned(2) = { 4526 0x51, 0x6F, 0x9A, 0x01, 0x00, 0x00 4527 }; 4528 4529 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 4530 return sdata->vif.type == NL80211_IFTYPE_STATION && bssid; 4531 4532 multicast = is_multicast_ether_addr(hdr->addr1); 4533 4534 switch (sdata->vif.type) { 4535 case NL80211_IFTYPE_STATION: 4536 if (!bssid && !sdata->u.mgd.use_4addr) 4537 return false; 4538 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4539 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4540 return false; 4541 if (multicast) 4542 return true; 4543 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4544 case NL80211_IFTYPE_ADHOC: 4545 if (!bssid) 4546 return false; 4547 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4548 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4549 !is_valid_ether_addr(hdr->addr2)) 4550 return false; 4551 if (ieee80211_is_beacon(hdr->frame_control)) 4552 return true; 4553 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4554 return false; 4555 if (!multicast && 4556 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4557 return false; 4558 if (!rx->sta) { 4559 int rate_idx; 4560 if (status->encoding != RX_ENC_LEGACY) 4561 rate_idx = 0; /* TODO: HT/VHT rates */ 4562 else 4563 rate_idx = status->rate_idx; 4564 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4565 BIT(rate_idx)); 4566 } 4567 return true; 4568 case NL80211_IFTYPE_OCB: 4569 if (!bssid) 4570 return false; 4571 if (!ieee80211_is_data_present(hdr->frame_control)) 4572 return false; 4573 if (!is_broadcast_ether_addr(bssid)) 4574 return false; 4575 if (!multicast && 4576 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4577 return false; 4578 /* reject invalid/our STA address */ 4579 if (!is_valid_ether_addr(hdr->addr2) || 4580 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4581 return false; 4582 if (!rx->sta) { 4583 int rate_idx; 4584 if (status->encoding != RX_ENC_LEGACY) 4585 rate_idx = 0; /* TODO: HT rates */ 4586 else 4587 rate_idx = status->rate_idx; 4588 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4589 BIT(rate_idx)); 4590 } 4591 return true; 4592 case NL80211_IFTYPE_MESH_POINT: 4593 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4594 return false; 4595 if (multicast) 4596 return true; 4597 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4598 case NL80211_IFTYPE_AP_VLAN: 4599 case NL80211_IFTYPE_AP: 4600 if (!bssid) 4601 return ieee80211_is_our_addr(sdata, hdr->addr1, 4602 &rx->link_id); 4603 4604 if (!is_broadcast_ether_addr(bssid) && 4605 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4606 /* 4607 * Accept public action frames even when the 4608 * BSSID doesn't match, this is used for P2P 4609 * and location updates. Note that mac80211 4610 * itself never looks at these frames. 4611 */ 4612 if (!multicast && 4613 !ieee80211_is_our_addr(sdata, hdr->addr1, 4614 &rx->link_id)) 4615 return false; 4616 if (ieee80211_is_public_action(hdr, skb->len)) 4617 return true; 4618 return ieee80211_is_beacon(hdr->frame_control); 4619 } 4620 4621 if (!ieee80211_has_tods(hdr->frame_control)) { 4622 /* ignore data frames to TDLS-peers */ 4623 if (ieee80211_is_data(hdr->frame_control)) 4624 return false; 4625 /* ignore action frames to TDLS-peers */ 4626 if (ieee80211_is_action(hdr->frame_control) && 4627 !is_broadcast_ether_addr(bssid) && 4628 !ether_addr_equal(bssid, hdr->addr1)) 4629 return false; 4630 } 4631 4632 /* 4633 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4634 * the BSSID - we've checked that already but may have accepted 4635 * the wildcard (ff:ff:ff:ff:ff:ff). 4636 * 4637 * It also says: 4638 * The BSSID of the Data frame is determined as follows: 4639 * a) If the STA is contained within an AP or is associated 4640 * with an AP, the BSSID is the address currently in use 4641 * by the STA contained in the AP. 4642 * 4643 * So we should not accept data frames with an address that's 4644 * multicast. 4645 * 4646 * Accepting it also opens a security problem because stations 4647 * could encrypt it with the GTK and inject traffic that way. 4648 */ 4649 if (ieee80211_is_data(hdr->frame_control) && multicast) 4650 return false; 4651 4652 return true; 4653 case NL80211_IFTYPE_P2P_DEVICE: 4654 return ieee80211_is_public_action(hdr, skb->len) || 4655 ieee80211_is_probe_req(hdr->frame_control) || 4656 ieee80211_is_probe_resp(hdr->frame_control) || 4657 ieee80211_is_beacon(hdr->frame_control) || 4658 (ieee80211_is_auth(hdr->frame_control) && 4659 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4660 case NL80211_IFTYPE_NAN: 4661 if (ieee80211_has_tods(hdr->frame_control) || 4662 ieee80211_has_fromds(hdr->frame_control)) 4663 return false; 4664 4665 /* 4666 * Accept only frames that are addressed to the NAN cluster 4667 * (based on the Cluster ID). From these frames, accept only 4668 * - public action frames, 4669 * - authentication frames to the local address, and 4670 * - robust management frames except disassoc. 4671 */ 4672 if (!ether_addr_equal(sdata->u.nan.conf.cluster_id, hdr->addr3)) 4673 return false; 4674 if (ieee80211_is_public_action(hdr, skb->len)) 4675 return true; 4676 if (ieee80211_is_auth(hdr->frame_control) && 4677 ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4678 return true; 4679 if (!ieee80211_is_disassoc(hdr->frame_control) && 4680 ieee80211_is_robust_mgmt_frame(skb)) 4681 return true; 4682 return false; 4683 case NL80211_IFTYPE_NAN_DATA: 4684 if (ieee80211_has_tods(hdr->frame_control) || 4685 ieee80211_has_fromds(hdr->frame_control)) 4686 return false; 4687 4688 if (ieee80211_is_data(hdr->frame_control)) { 4689 struct ieee80211_sub_if_data *nmi; 4690 4691 nmi = rcu_dereference(sdata->u.nan_data.nmi); 4692 if (!nmi) 4693 return false; 4694 4695 if (!ether_addr_equal(nmi->u.nan.conf.cluster_id, 4696 hdr->addr3)) 4697 return false; 4698 4699 return multicast || 4700 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4701 } 4702 4703 /* Non-public action frames (unicast or multicast) */ 4704 if (ieee80211_is_action(hdr->frame_control) && 4705 !ieee80211_is_public_action(hdr, skb->len) && 4706 (ether_addr_equal(nan_network_id, hdr->addr1) || 4707 ether_addr_equal(sdata->vif.addr, hdr->addr1))) 4708 return true; 4709 4710 /* Unicast secure management frames */ 4711 return ether_addr_equal(sdata->vif.addr, hdr->addr1) && 4712 ieee80211_is_unicast_robust_mgmt_frame(skb); 4713 case NL80211_IFTYPE_PD: 4714 /* 4715 * Accept only authentication frames (PASN) addressed to 4716 * this interface. 4717 */ 4718 return ieee80211_is_auth(hdr->frame_control) && 4719 ether_addr_equal(sdata->vif.addr, hdr->addr1); 4720 default: 4721 break; 4722 } 4723 4724 WARN_ON_ONCE(1); 4725 return false; 4726 } 4727 4728 void ieee80211_check_fast_rx(struct sta_info *sta) 4729 { 4730 struct ieee80211_sub_if_data *sdata = sta->sdata; 4731 struct ieee80211_local *local = sdata->local; 4732 struct ieee80211_key *key; 4733 struct ieee80211_fast_rx fastrx = { 4734 .dev = sdata->dev, 4735 .vif_type = sdata->vif.type, 4736 .control_port_protocol = sdata->control_port_protocol, 4737 }, *old, *new = NULL; 4738 u32 offload_flags; 4739 bool set_offload = false; 4740 bool assign = false; 4741 bool offload; 4742 4743 /* use sparse to check that we don't return without updating */ 4744 __acquire(check_fast_rx); 4745 4746 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4747 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4748 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4749 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4750 4751 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4752 4753 /* fast-rx doesn't do reordering */ 4754 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4755 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4756 goto clear; 4757 4758 switch (sdata->vif.type) { 4759 case NL80211_IFTYPE_STATION: 4760 if (sta->sta.tdls) { 4761 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4762 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4763 fastrx.expected_ds_bits = 0; 4764 } else { 4765 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4766 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4767 fastrx.expected_ds_bits = 4768 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4769 } 4770 4771 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4772 fastrx.expected_ds_bits |= 4773 cpu_to_le16(IEEE80211_FCTL_TODS); 4774 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4775 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4776 } 4777 4778 if (!sdata->u.mgd.powersave) 4779 break; 4780 4781 /* software powersave is a huge mess, avoid all of it */ 4782 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4783 goto clear; 4784 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4785 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4786 goto clear; 4787 break; 4788 case NL80211_IFTYPE_AP_VLAN: 4789 case NL80211_IFTYPE_AP: 4790 /* parallel-rx requires this, at least with calls to 4791 * ieee80211_sta_ps_transition() 4792 */ 4793 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4794 goto clear; 4795 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4796 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4797 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4798 4799 fastrx.internal_forward = 4800 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4801 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4802 !sdata->u.vlan.sta); 4803 4804 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4805 sdata->u.vlan.sta) { 4806 fastrx.expected_ds_bits |= 4807 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4808 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4809 fastrx.internal_forward = 0; 4810 } 4811 4812 break; 4813 case NL80211_IFTYPE_MESH_POINT: 4814 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4815 IEEE80211_FCTL_TODS); 4816 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4817 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4818 break; 4819 default: 4820 goto clear; 4821 } 4822 4823 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4824 goto clear; 4825 4826 rcu_read_lock(); 4827 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4828 if (!key) 4829 key = rcu_dereference(sdata->default_unicast_key); 4830 if (key) { 4831 switch (key->conf.cipher) { 4832 case WLAN_CIPHER_SUITE_TKIP: 4833 /* we don't want to deal with MMIC in fast-rx */ 4834 goto clear_rcu; 4835 case WLAN_CIPHER_SUITE_CCMP: 4836 case WLAN_CIPHER_SUITE_CCMP_256: 4837 case WLAN_CIPHER_SUITE_GCMP: 4838 case WLAN_CIPHER_SUITE_GCMP_256: 4839 break; 4840 default: 4841 /* We also don't want to deal with 4842 * WEP or cipher scheme. 4843 */ 4844 goto clear_rcu; 4845 } 4846 4847 fastrx.key = true; 4848 fastrx.icv_len = key->conf.icv_len; 4849 } 4850 4851 assign = true; 4852 clear_rcu: 4853 rcu_read_unlock(); 4854 clear: 4855 __release(check_fast_rx); 4856 4857 if (assign) 4858 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4859 4860 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4861 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4862 4863 if (assign && offload) 4864 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4865 else 4866 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4867 4868 if (set_offload) 4869 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4870 4871 spin_lock_bh(&sta->lock); 4872 old = rcu_dereference_protected(sta->fast_rx, true); 4873 rcu_assign_pointer(sta->fast_rx, new); 4874 spin_unlock_bh(&sta->lock); 4875 4876 if (old) 4877 kfree_rcu(old, rcu_head); 4878 } 4879 4880 void ieee80211_clear_fast_rx(struct sta_info *sta) 4881 { 4882 struct ieee80211_fast_rx *old; 4883 4884 spin_lock_bh(&sta->lock); 4885 old = rcu_dereference_protected(sta->fast_rx, true); 4886 RCU_INIT_POINTER(sta->fast_rx, NULL); 4887 spin_unlock_bh(&sta->lock); 4888 4889 if (old) 4890 kfree_rcu(old, rcu_head); 4891 } 4892 4893 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4894 { 4895 struct ieee80211_local *local = sdata->local; 4896 struct sta_info *sta; 4897 4898 lockdep_assert_wiphy(local->hw.wiphy); 4899 4900 list_for_each_entry(sta, &local->sta_list, list) { 4901 if (sdata != sta->sdata && 4902 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4903 continue; 4904 ieee80211_check_fast_rx(sta); 4905 } 4906 } 4907 4908 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4909 { 4910 struct ieee80211_local *local = sdata->local; 4911 4912 lockdep_assert_wiphy(local->hw.wiphy); 4913 4914 __ieee80211_check_fast_rx_iface(sdata); 4915 } 4916 4917 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4918 struct ieee80211_fast_rx *fast_rx, 4919 int orig_len) 4920 { 4921 struct ieee80211_sta_rx_stats *stats; 4922 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4923 struct sta_info *sta = rx->sta; 4924 struct link_sta_info *link_sta; 4925 struct sk_buff *skb = rx->skb; 4926 void *sa = skb->data + ETH_ALEN; 4927 void *da = skb->data; 4928 4929 if (rx->link_id >= 0) { 4930 link_sta = rcu_dereference(sta->link[rx->link_id]); 4931 if (WARN_ON_ONCE(!link_sta)) { 4932 dev_kfree_skb(rx->skb); 4933 return; 4934 } 4935 } else { 4936 link_sta = &sta->deflink; 4937 } 4938 4939 stats = &link_sta->rx_stats; 4940 if (fast_rx->uses_rss) 4941 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4942 4943 /* statistics part of ieee80211_rx_h_sta_process() */ 4944 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4945 stats->last_signal = status->signal; 4946 if (!fast_rx->uses_rss) 4947 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4948 -status->signal); 4949 } 4950 4951 if (status->chains) { 4952 int i; 4953 4954 stats->chains = status->chains; 4955 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4956 int signal = status->chain_signal[i]; 4957 4958 if (!(status->chains & BIT(i))) 4959 continue; 4960 4961 stats->chain_signal_last[i] = signal; 4962 if (!fast_rx->uses_rss) 4963 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4964 -signal); 4965 } 4966 } 4967 /* end of statistics */ 4968 4969 stats->last_rx = jiffies; 4970 stats->last_rate = sta_stats_encode_rate(status); 4971 4972 stats->fragments++; 4973 stats->packets++; 4974 4975 skb->dev = fast_rx->dev; 4976 4977 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4978 4979 /* The seqno index has the same property as needed 4980 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4981 * for non-QoS-data frames. Here we know it's a data 4982 * frame, so count MSDUs. 4983 */ 4984 u64_stats_update_begin(&stats->syncp); 4985 u64_stats_inc(&stats->msdu[rx->seqno_idx]); 4986 u64_stats_add(&stats->bytes, orig_len); 4987 u64_stats_update_end(&stats->syncp); 4988 4989 if (fast_rx->internal_forward) { 4990 struct sk_buff *xmit_skb = NULL; 4991 if (is_multicast_ether_addr(da)) { 4992 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4993 } else if (!ether_addr_equal(da, sa) && 4994 sta_info_get(rx->sdata, da)) { 4995 xmit_skb = skb; 4996 skb = NULL; 4997 } 4998 4999 if (xmit_skb) { 5000 /* 5001 * Send to wireless media and increase priority by 256 5002 * to keep the received priority instead of 5003 * reclassifying the frame (see cfg80211_classify8021d). 5004 */ 5005 xmit_skb->priority += 256; 5006 xmit_skb->protocol = htons(ETH_P_802_3); 5007 skb_reset_network_header(xmit_skb); 5008 skb_reset_mac_header(xmit_skb); 5009 dev_queue_xmit(xmit_skb); 5010 } 5011 5012 if (!skb) 5013 return; 5014 } 5015 5016 /* deliver to local stack */ 5017 skb->protocol = eth_type_trans(skb, fast_rx->dev); 5018 ieee80211_deliver_skb_to_local_stack(skb, rx); 5019 } 5020 5021 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 5022 struct ieee80211_fast_rx *fast_rx) 5023 { 5024 struct sk_buff *skb = rx->skb; 5025 struct ieee80211_hdr *hdr = (void *)skb->data; 5026 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5027 ieee80211_rx_result res; 5028 int orig_len = skb->len; 5029 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 5030 int snap_offs = hdrlen; 5031 struct { 5032 u8 snap[sizeof(rfc1042_header)]; 5033 __be16 proto; 5034 } *payload __aligned(2); 5035 struct { 5036 u8 da[ETH_ALEN]; 5037 u8 sa[ETH_ALEN]; 5038 } addrs __aligned(2); 5039 struct ieee80211_sta_rx_stats *stats; 5040 u32 encoded_rate; 5041 5042 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 5043 * to a common data structure; drivers can implement that per queue 5044 * but we don't have that information in mac80211 5045 */ 5046 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 5047 return false; 5048 5049 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 5050 5051 /* If using encryption, we also need to have: 5052 * - PN_VALIDATED: similar, but the implementation is tricky 5053 * - DECRYPTED: necessary for PN_VALIDATED 5054 */ 5055 if (fast_rx->key && 5056 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 5057 return false; 5058 5059 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 5060 return false; 5061 5062 if (unlikely(ieee80211_is_frag(hdr))) 5063 return false; 5064 5065 /* Since our interface address cannot be multicast, this 5066 * implicitly also rejects multicast frames without the 5067 * explicit check. 5068 * 5069 * We shouldn't get any *data* frames not addressed to us 5070 * (AP mode will accept multicast *management* frames), but 5071 * punting here will make it go through the full checks in 5072 * ieee80211_accept_frame(). 5073 */ 5074 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 5075 return false; 5076 5077 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 5078 IEEE80211_FCTL_TODS)) != 5079 fast_rx->expected_ds_bits) 5080 return false; 5081 5082 /* assign the key to drop unencrypted frames (later) 5083 * and strip the IV/MIC if necessary 5084 */ 5085 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 5086 /* GCMP header length is the same */ 5087 snap_offs += IEEE80211_CCMP_HDR_LEN; 5088 } 5089 5090 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 5091 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 5092 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 5093 return false; 5094 5095 payload = (void *)(skb->data + snap_offs); 5096 5097 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 5098 return false; 5099 5100 /* Don't handle these here since they require special code. 5101 * Accept AARP and IPX even though they should come with a 5102 * bridge-tunnel header - but if we get them this way then 5103 * there's little point in discarding them. 5104 */ 5105 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 5106 payload->proto == fast_rx->control_port_protocol)) 5107 return false; 5108 } 5109 5110 /* after this point, don't punt to the slowpath! */ 5111 5112 if (fast_rx->uses_rss) 5113 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 5114 else 5115 stats = &rx->link_sta->rx_stats; 5116 5117 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 5118 pskb_trim(skb, skb->len - fast_rx->icv_len)) 5119 goto drop; 5120 5121 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 5122 goto drop; 5123 5124 if (status->rx_flags & IEEE80211_RX_AMSDU) { 5125 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 5126 RX_QUEUED) 5127 goto drop; 5128 5129 return true; 5130 } 5131 5132 /* do the header conversion - first grab the addresses */ 5133 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 5134 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 5135 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 5136 skb_pull(skb, snap_offs - 2); 5137 put_unaligned_be16(skb->len - 2, skb->data); 5138 } else { 5139 skb_postpull_rcsum(skb, skb->data + snap_offs, 5140 sizeof(rfc1042_header) + 2); 5141 5142 /* remove the SNAP but leave the ethertype */ 5143 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 5144 } 5145 /* push the addresses in front */ 5146 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 5147 5148 /* capture before mesh forward may memset or free skb->cb */ 5149 encoded_rate = sta_stats_encode_rate(status); 5150 5151 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 5152 switch (res) { 5153 case RX_QUEUED: 5154 stats->last_rx = jiffies; 5155 stats->last_rate = encoded_rate; 5156 return true; 5157 case RX_CONTINUE: 5158 break; 5159 default: 5160 goto drop; 5161 } 5162 5163 ieee80211_rx_8023(rx, fast_rx, orig_len); 5164 5165 return true; 5166 drop: 5167 dev_kfree_skb(skb); 5168 5169 stats->dropped++; 5170 return true; 5171 } 5172 5173 /* 5174 * This function returns whether or not the SKB 5175 * was destined for RX processing or not, which, 5176 * if consume is true, is equivalent to whether 5177 * or not the skb was consumed. 5178 */ 5179 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 5180 struct sk_buff *skb, bool consume) 5181 { 5182 struct ieee80211_local *local = rx->local; 5183 struct ieee80211_sub_if_data *sdata = rx->sdata; 5184 struct ieee80211_hdr *hdr = (void *)skb->data; 5185 struct link_sta_info *link_sta = rx->link_sta; 5186 struct ieee80211_link_data *link = rx->link; 5187 5188 rx->skb = skb; 5189 5190 /* See if we can do fast-rx; if we have to copy we already lost, 5191 * so punt in that case. We should never have to deliver a data 5192 * frame to multiple interfaces anyway. 5193 * 5194 * We skip the ieee80211_accept_frame() call and do the necessary 5195 * checking inside ieee80211_invoke_fast_rx(). 5196 */ 5197 if (consume && rx->sta) { 5198 struct ieee80211_fast_rx *fast_rx; 5199 5200 fast_rx = rcu_dereference(rx->sta->fast_rx); 5201 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5202 return true; 5203 } 5204 5205 if (!ieee80211_accept_frame(rx)) 5206 return false; 5207 5208 if (!consume) { 5209 struct skb_shared_hwtstamps *shwt; 5210 5211 rx->skb = skb_copy(skb, GFP_ATOMIC); 5212 if (!rx->skb) { 5213 if (net_ratelimit()) 5214 wiphy_debug(local->hw.wiphy, 5215 "failed to copy skb for %s\n", 5216 sdata->name); 5217 return true; 5218 } 5219 5220 /* skb_copy() does not copy the hw timestamps, so copy it 5221 * explicitly 5222 */ 5223 shwt = skb_hwtstamps(rx->skb); 5224 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5225 5226 /* Update the hdr pointer to the new skb for translation below */ 5227 hdr = (struct ieee80211_hdr *)rx->skb->data; 5228 } 5229 5230 if (ieee80211_is_s1g_beacon(hdr->frame_control)) { 5231 ieee80211_invoke_rx_handlers(rx); 5232 return true; 5233 } 5234 5235 /* Store a copy of the pre-translated link addresses for SW crypto */ 5236 if (unlikely(is_unicast_ether_addr(hdr->addr1) && 5237 !ieee80211_is_data(hdr->frame_control))) 5238 memcpy(rx->link_addrs, &hdr->addrs, 3 * ETH_ALEN); 5239 5240 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5241 is_unicast_ether_addr(hdr->addr1) && 5242 !ieee80211_is_probe_resp(hdr->frame_control) && 5243 !ieee80211_is_beacon(hdr->frame_control)) { 5244 /* translate to MLD addresses */ 5245 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5246 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5247 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5248 ether_addr_copy(hdr->addr2, rx->sta->addr); 5249 /* translate A3 only if it's the BSSID */ 5250 if (!ieee80211_has_tods(hdr->frame_control) && 5251 !ieee80211_has_fromds(hdr->frame_control)) { 5252 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5253 ether_addr_copy(hdr->addr3, rx->sta->addr); 5254 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5255 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5256 } 5257 /* not needed for A4 since it can only carry the SA */ 5258 } 5259 5260 ieee80211_invoke_rx_handlers(rx); 5261 return true; 5262 } 5263 5264 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5265 struct ieee80211_sta *pubsta, 5266 struct sk_buff *skb, 5267 struct list_head *list) 5268 { 5269 struct ieee80211_local *local = hw_to_local(hw); 5270 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5271 struct ieee80211_fast_rx *fast_rx; 5272 struct ieee80211_rx_data rx; 5273 struct sta_info *sta; 5274 int link_id = -1; 5275 5276 memset(&rx, 0, sizeof(rx)); 5277 rx.skb = skb; 5278 rx.local = local; 5279 rx.list = list; 5280 rx.link_id = -1; 5281 5282 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5283 5284 /* drop frame if too short for header */ 5285 if (skb->len < sizeof(struct ethhdr)) 5286 goto drop; 5287 5288 if (!pubsta) 5289 goto drop; 5290 5291 if (status->link_valid) 5292 link_id = status->link_id; 5293 5294 /* 5295 * TODO: Should the frame be dropped if the right link_id is not 5296 * available? Or may be it is fine in the current form to proceed with 5297 * the frame processing because with frame being in 802.3 format, 5298 * link_id is used only for stats purpose and updating the stats on 5299 * the deflink is fine? 5300 */ 5301 sta = container_of(pubsta, struct sta_info, sta); 5302 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5303 goto drop; 5304 5305 fast_rx = rcu_dereference(rx.sta->fast_rx); 5306 if (!fast_rx) 5307 goto drop; 5308 5309 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5310 return; 5311 5312 drop: 5313 dev_kfree_skb(skb); 5314 } 5315 5316 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5317 struct sk_buff *skb, bool consume) 5318 { 5319 struct link_sta_info *link_sta; 5320 struct ieee80211_hdr *hdr = (void *)skb->data; 5321 struct sta_info *sta; 5322 int link_id = -1; 5323 5324 if (ieee80211_is_s1g_beacon(hdr->frame_control)) { 5325 if (!ieee80211_rx_data_set_sta(rx, NULL, -1)) 5326 return false; 5327 5328 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5329 } 5330 5331 /* 5332 * Look up link station first, in case there's a 5333 * chance that they might have a link address that 5334 * is identical to the MLD address, that way we'll 5335 * have the link information if needed. 5336 */ 5337 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5338 if (link_sta) { 5339 sta = link_sta->sta; 5340 link_id = link_sta->link_id; 5341 } else { 5342 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5343 5344 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5345 if (status->link_valid) { 5346 link_id = status->link_id; 5347 } else if (ieee80211_vif_is_mld(&rx->sdata->vif) && 5348 status->freq) { 5349 struct ieee80211_link_data *link; 5350 struct ieee80211_chanctx_conf *conf; 5351 5352 for_each_link_data_rcu(rx->sdata, link) { 5353 conf = rcu_dereference(link->conf->chanctx_conf); 5354 if (!conf || !conf->def.chan) 5355 continue; 5356 5357 if (status->freq == conf->def.chan->center_freq) { 5358 link_id = link->link_id; 5359 break; 5360 } 5361 } 5362 } 5363 } 5364 5365 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5366 return false; 5367 5368 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5369 } 5370 5371 /* 5372 * This is the actual Rx frames handler. as it belongs to Rx path it must 5373 * be called with rcu_read_lock protection. 5374 */ 5375 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5376 struct ieee80211_sta *pubsta, 5377 struct sk_buff *skb, 5378 struct list_head *list) 5379 { 5380 struct ieee80211_local *local = hw_to_local(hw); 5381 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5382 struct ieee80211_sub_if_data *sdata; 5383 struct ieee80211_hdr *hdr; 5384 __le16 fc; 5385 struct ieee80211_rx_data rx; 5386 struct ieee80211_sub_if_data *prev; 5387 struct rhlist_head *tmp; 5388 int err = 0; 5389 5390 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5391 memset(&rx, 0, sizeof(rx)); 5392 rx.skb = skb; 5393 rx.local = local; 5394 rx.list = list; 5395 rx.link_id = -1; 5396 5397 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5398 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5399 5400 if (ieee80211_is_mgmt(fc)) { 5401 /* drop frame if too short for header */ 5402 if (skb->len < ieee80211_hdrlen(fc)) 5403 err = -ENOBUFS; 5404 else 5405 err = skb_linearize(skb); 5406 } else if (ieee80211_is_s1g_beacon(fc)) { 5407 size_t s1g_hdr_len = offsetof(struct ieee80211_ext, 5408 u.s1g_beacon.variable) + 5409 ieee80211_s1g_optional_len(fc); 5410 5411 if (skb->len < s1g_hdr_len) 5412 err = -ENOBUFS; 5413 else 5414 err = skb_linearize(skb); 5415 } else if (ieee80211_is_ext(fc)) { 5416 err = -EINVAL; 5417 } else { 5418 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5419 } 5420 5421 if (err) { 5422 dev_kfree_skb(skb); 5423 return; 5424 } 5425 5426 hdr = (struct ieee80211_hdr *)skb->data; 5427 ieee80211_parse_qos(&rx); 5428 ieee80211_verify_alignment(&rx); 5429 5430 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5431 ieee80211_is_beacon(hdr->frame_control) || 5432 ieee80211_is_s1g_beacon(hdr->frame_control))) 5433 ieee80211_scan_rx(local, skb); 5434 5435 if (ieee80211_is_data(fc)) { 5436 struct sta_info *sta, *prev_sta; 5437 int link_id = -1; 5438 5439 if (status->link_valid) 5440 link_id = status->link_id; 5441 5442 if (pubsta) { 5443 sta = container_of(pubsta, struct sta_info, sta); 5444 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5445 goto out; 5446 5447 /* 5448 * In MLO connection, fetch the link_id using addr2 5449 * when the driver does not pass link_id in status. 5450 * When the address translation is already performed by 5451 * driver/hw, the valid link_id must be passed in 5452 * status. 5453 */ 5454 5455 if (!status->link_valid && pubsta->mlo) { 5456 struct link_sta_info *link_sta; 5457 5458 link_sta = link_sta_info_get_bss(rx.sdata, 5459 hdr->addr2); 5460 if (!link_sta) 5461 goto out; 5462 5463 if (!ieee80211_rx_data_set_link(&rx, 5464 link_sta->link_id)) 5465 goto out; 5466 } 5467 5468 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5469 return; 5470 goto out; 5471 } 5472 5473 prev_sta = NULL; 5474 5475 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5476 if (!prev_sta) { 5477 prev_sta = sta; 5478 continue; 5479 } 5480 5481 rx.sdata = prev_sta->sdata; 5482 if (!status->link_valid && prev_sta->sta.mlo) { 5483 struct link_sta_info *link_sta; 5484 5485 link_sta = link_sta_info_get_bss(rx.sdata, 5486 hdr->addr2); 5487 if (!link_sta) 5488 continue; 5489 5490 link_id = link_sta->link_id; 5491 } 5492 5493 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5494 goto out; 5495 5496 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5497 5498 prev_sta = sta; 5499 } 5500 5501 if (prev_sta) { 5502 rx.sdata = prev_sta->sdata; 5503 if (!status->link_valid && prev_sta->sta.mlo) { 5504 struct link_sta_info *link_sta; 5505 5506 link_sta = link_sta_info_get_bss(rx.sdata, 5507 hdr->addr2); 5508 if (!link_sta) 5509 goto out; 5510 5511 link_id = link_sta->link_id; 5512 } 5513 5514 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5515 goto out; 5516 5517 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5518 return; 5519 goto out; 5520 } 5521 } 5522 5523 prev = NULL; 5524 5525 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5526 if (!ieee80211_sdata_running(sdata)) 5527 continue; 5528 5529 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5530 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5531 continue; 5532 5533 /* 5534 * frame is destined for this interface, but if it's 5535 * not also for the previous one we handle that after 5536 * the loop to avoid copying the SKB once too much 5537 */ 5538 5539 if (!prev) { 5540 prev = sdata; 5541 continue; 5542 } 5543 5544 rx.sdata = prev; 5545 ieee80211_rx_for_interface(&rx, skb, false); 5546 5547 prev = sdata; 5548 } 5549 5550 if (prev) { 5551 rx.sdata = prev; 5552 5553 if (ieee80211_rx_for_interface(&rx, skb, true)) 5554 return; 5555 } 5556 5557 out: 5558 dev_kfree_skb(skb); 5559 } 5560 5561 /* 5562 * This is the receive path handler. It is called by a low level driver when an 5563 * 802.11 MPDU is received from the hardware. 5564 */ 5565 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5566 struct sk_buff *skb, struct list_head *list) 5567 { 5568 struct ieee80211_local *local = hw_to_local(hw); 5569 struct ieee80211_rate *rate = NULL; 5570 struct ieee80211_supported_band *sband; 5571 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5572 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5573 5574 WARN_ON_ONCE(softirq_count() == 0); 5575 5576 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5577 goto drop; 5578 5579 sband = local->hw.wiphy->bands[status->band]; 5580 if (WARN_ON(!sband)) 5581 goto drop; 5582 5583 /* 5584 * If we're suspending, it is possible although not too likely 5585 * that we'd be receiving frames after having already partially 5586 * quiesced the stack. We can't process such frames then since 5587 * that might, for example, cause stations to be added or other 5588 * driver callbacks be invoked. 5589 */ 5590 if (unlikely(local->quiescing || local->suspended)) 5591 goto drop; 5592 5593 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5594 if (unlikely(local->in_reconfig)) 5595 goto drop; 5596 5597 /* 5598 * The same happens when we're not even started, 5599 * but that's worth a warning. 5600 */ 5601 if (WARN_ON(!local->started)) 5602 goto drop; 5603 5604 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC) && 5605 !(status->flag & RX_FLAG_NO_PSDU && 5606 status->zero_length_psdu_type == 5607 IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED))) { 5608 /* 5609 * Validate the rate, unless there was a PLCP error which may 5610 * have an invalid rate or the PSDU was not capture and may be 5611 * missing rate information. 5612 */ 5613 5614 switch (status->encoding) { 5615 case RX_ENC_HT: 5616 /* 5617 * rate_idx is MCS index, which can be [0-76] 5618 * as documented on: 5619 * 5620 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5621 * 5622 * Anything else would be some sort of driver or 5623 * hardware error. The driver should catch hardware 5624 * errors. 5625 */ 5626 if (WARN(status->rate_idx > 76, 5627 "Rate marked as an HT rate but passed " 5628 "status->rate_idx is not " 5629 "an MCS index [0-76]: %d (0x%02x)\n", 5630 status->rate_idx, 5631 status->rate_idx)) 5632 goto drop; 5633 break; 5634 case RX_ENC_VHT: 5635 if (WARN_ONCE(status->rate_idx > 11 || 5636 !status->nss || 5637 status->nss > 8, 5638 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5639 status->rate_idx, status->nss)) 5640 goto drop; 5641 break; 5642 case RX_ENC_HE: 5643 if (WARN_ONCE(status->rate_idx > 11 || 5644 !status->nss || 5645 status->nss > 8, 5646 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5647 status->rate_idx, status->nss)) 5648 goto drop; 5649 break; 5650 case RX_ENC_EHT: 5651 if (WARN_ONCE(status->rate_idx > 15 || 5652 !status->nss || 5653 status->nss > 8 || 5654 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5655 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5656 status->rate_idx, status->nss, status->eht.gi)) 5657 goto drop; 5658 break; 5659 case RX_ENC_UHR: 5660 if (WARN_ONCE(!(status->rate_idx <= 15 || 5661 status->rate_idx == 17 || 5662 status->rate_idx == 19 || 5663 status->rate_idx == 20 || 5664 status->rate_idx == 23) || 5665 !status->nss || 5666 status->nss > 8 || 5667 status->uhr.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5668 "Rate marked as a UHR rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5669 status->rate_idx, status->nss, status->uhr.gi)) 5670 goto drop; 5671 if (WARN_ONCE(status->uhr.elr && 5672 (status->nss != 1 || status->rate_idx > 1 || 5673 status->uhr.gi != NL80211_RATE_INFO_EHT_GI_1_6 || 5674 status->bw != RATE_INFO_BW_20 || status->uhr.im), 5675 "bad UHR ELR MCS MCS:%d, NSS:%d, GI:%d, BW:%d, IM:%d\n", 5676 status->rate_idx, status->nss, status->uhr.gi, 5677 status->bw, status->uhr.im)) 5678 goto drop; 5679 if (WARN_ONCE(status->uhr.im && 5680 (status->nss != 1 || status->rate_idx == 15), 5681 "bad UHR IM MCS MCS:%d, NSS:%d\n", 5682 status->rate_idx, status->nss)) 5683 goto drop; 5684 break; 5685 case RX_ENC_S1G: 5686 if (WARN_ONCE(status->rate_idx > 12 || 5687 !status->nss || 5688 status->nss > 4, 5689 "Rate marked as an S1G rate but data is invalid: MCS: %d, NSS: %d\n", 5690 status->rate_idx, status->nss)) 5691 goto drop; 5692 break; 5693 default: 5694 WARN_ON_ONCE(1); 5695 fallthrough; 5696 case RX_ENC_LEGACY: 5697 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5698 goto drop; 5699 rate = &sband->bitrates[status->rate_idx]; 5700 } 5701 } 5702 5703 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5704 goto drop; 5705 5706 status->rx_flags = 0; 5707 5708 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5709 5710 /* 5711 * Frames with failed FCS/PLCP checksum are not returned, 5712 * all other frames are returned without radiotap header 5713 * if it was previously present. 5714 * Also, frames with less than 16 bytes are dropped. 5715 */ 5716 if (!(status->flag & RX_FLAG_8023)) 5717 skb = ieee80211_rx_monitor(local, skb, rate); 5718 if (skb) { 5719 if ((status->flag & RX_FLAG_8023) || 5720 ieee80211_is_data_present(hdr->frame_control)) 5721 ieee80211_tpt_led_trig_rx(local, skb->len); 5722 5723 if (status->flag & RX_FLAG_8023) 5724 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5725 else 5726 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5727 } 5728 5729 kcov_remote_stop(); 5730 return; 5731 drop: 5732 kfree_skb(skb); 5733 } 5734 EXPORT_SYMBOL(ieee80211_rx_list); 5735 5736 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5737 struct sk_buff *skb, struct napi_struct *napi) 5738 { 5739 struct sk_buff *tmp; 5740 LIST_HEAD(list); 5741 5742 5743 /* 5744 * key references and virtual interfaces are protected using RCU 5745 * and this requires that we are in a read-side RCU section during 5746 * receive processing 5747 */ 5748 rcu_read_lock(); 5749 ieee80211_rx_list(hw, pubsta, skb, &list); 5750 rcu_read_unlock(); 5751 5752 if (!napi) { 5753 netif_receive_skb_list(&list); 5754 return; 5755 } 5756 5757 list_for_each_entry_safe(skb, tmp, &list, list) { 5758 skb_list_del_init(skb); 5759 napi_gro_receive(napi, skb); 5760 } 5761 } 5762 EXPORT_SYMBOL(ieee80211_rx_napi); 5763 5764 /* This is a version of the rx handler that can be called from hard irq 5765 * context. Post the skb on the queue and schedule the tasklet */ 5766 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5767 { 5768 struct ieee80211_local *local = hw_to_local(hw); 5769 5770 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5771 5772 skb->pkt_type = IEEE80211_RX_MSG; 5773 skb_queue_tail(&local->skb_queue, skb); 5774 tasklet_schedule(&local->tasklet); 5775 } 5776 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5777