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, 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_buf[index]; 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_buf[index]; 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_time[j] + 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_buf[i]); 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_time[j] + 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_buf[index], skb); 1430 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1431 tid_agg_rx->reorder_time[index] = jiffies; 1432 tid_agg_rx->stored_mpdu_num++; 1433 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1434 } 1435 1436 out: 1437 spin_unlock(&tid_agg_rx->reorder_lock); 1438 return ret; 1439 } 1440 1441 /* 1442 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1443 * true if the MPDU was buffered, false if it should be processed. 1444 */ 1445 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1446 struct sk_buff_head *frames) 1447 { 1448 struct sk_buff *skb = rx->skb; 1449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1450 struct sta_info *sta = rx->sta; 1451 struct tid_ampdu_rx *tid_agg_rx; 1452 u16 sc; 1453 u8 tid, ack_policy; 1454 1455 if (!ieee80211_is_data_qos(hdr->frame_control) || 1456 is_multicast_ether_addr(hdr->addr1)) 1457 goto dont_reorder; 1458 1459 /* 1460 * filter the QoS data rx stream according to 1461 * STA/TID and check if this STA/TID is on aggregation 1462 */ 1463 1464 if (!sta) 1465 goto dont_reorder; 1466 1467 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1468 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1469 tid = ieee80211_get_tid(hdr); 1470 1471 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1472 if (!tid_agg_rx) { 1473 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1474 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1475 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1476 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1477 WLAN_BACK_RECIPIENT, 1478 WLAN_REASON_QSTA_REQUIRE_SETUP, 1479 ieee80211_s1g_use_ndp_ba(rx->sdata, 1480 rx->sta)); 1481 goto dont_reorder; 1482 } 1483 1484 /* qos null data frames are excluded */ 1485 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1486 goto dont_reorder; 1487 1488 /* not part of a BA session */ 1489 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 1490 goto dont_reorder; 1491 1492 /* new, potentially un-ordered, ampdu frame - process it */ 1493 1494 /* reset session timer */ 1495 if (tid_agg_rx->timeout) 1496 tid_agg_rx->last_rx = jiffies; 1497 1498 /* if this mpdu is fragmented - terminate rx aggregation session */ 1499 sc = le16_to_cpu(hdr->seq_ctrl); 1500 if (sc & IEEE80211_SCTL_FRAG) { 1501 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb); 1502 return; 1503 } 1504 1505 /* 1506 * No locking needed -- we will only ever process one 1507 * RX packet at a time, and thus own tid_agg_rx. All 1508 * other code manipulating it needs to (and does) make 1509 * sure that we cannot get to it any more before doing 1510 * anything with it. 1511 */ 1512 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1513 frames)) 1514 return; 1515 1516 dont_reorder: 1517 __skb_queue_tail(frames, skb); 1518 } 1519 1520 static ieee80211_rx_result debug_noinline 1521 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1522 { 1523 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1524 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1525 1526 if (status->flag & RX_FLAG_DUP_VALIDATED) 1527 return RX_CONTINUE; 1528 1529 /* 1530 * Drop duplicate 802.11 retransmissions 1531 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1532 */ 1533 1534 if (rx->skb->len < 24) 1535 return RX_CONTINUE; 1536 1537 if (ieee80211_is_ctl(hdr->frame_control) || 1538 ieee80211_is_any_nullfunc(hdr->frame_control)) 1539 return RX_CONTINUE; 1540 1541 if (!rx->sta) 1542 return RX_CONTINUE; 1543 1544 if (unlikely(is_multicast_ether_addr(hdr->addr1))) { 1545 struct ieee80211_sub_if_data *sdata = rx->sdata; 1546 u16 sn = ieee80211_get_sn(hdr); 1547 1548 if (!ieee80211_is_data_present(hdr->frame_control)) 1549 return RX_CONTINUE; 1550 1551 if (!ieee80211_vif_is_mld(&sdata->vif) || 1552 sdata->vif.type != NL80211_IFTYPE_STATION) 1553 return RX_CONTINUE; 1554 1555 if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO && 1556 ieee80211_sn_less_eq(sn, sdata->u.mgd.mcast_seq_last)) 1557 return RX_DROP_U_DUP; 1558 1559 sdata->u.mgd.mcast_seq_last = sn; 1560 return RX_CONTINUE; 1561 } 1562 1563 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1564 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1565 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1566 rx->link_sta->rx_stats.num_duplicates++; 1567 return RX_DROP_U_DUP; 1568 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1569 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1570 } 1571 1572 return RX_CONTINUE; 1573 } 1574 1575 static ieee80211_rx_result debug_noinline 1576 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1577 { 1578 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1579 1580 /* Drop disallowed frame classes based on STA auth/assoc state; 1581 * IEEE 802.11, Chap 5.5. 1582 * 1583 * mac80211 filters only based on association state, i.e. it drops 1584 * Class 3 frames from not associated stations. hostapd sends 1585 * deauth/disassoc frames when needed. In addition, hostapd is 1586 * responsible for filtering on both auth and assoc states. 1587 */ 1588 1589 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1590 return ieee80211_rx_mesh_check(rx); 1591 1592 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1593 ieee80211_is_pspoll(hdr->frame_control)) && 1594 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1595 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1596 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1597 /* 1598 * accept port control frames from the AP even when it's not 1599 * yet marked ASSOC to prevent a race where we don't set the 1600 * assoc bit quickly enough before it sends the first frame 1601 */ 1602 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1603 ieee80211_is_data_present(hdr->frame_control)) { 1604 unsigned int hdrlen; 1605 __be16 ethertype; 1606 1607 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1608 1609 if (rx->skb->len < hdrlen + 8) 1610 return RX_DROP_U_RUNT_DATA; 1611 1612 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1613 if (ethertype == rx->sdata->control_port_protocol) 1614 return RX_CONTINUE; 1615 } 1616 1617 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1618 cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2, 1619 rx->link_id, GFP_ATOMIC)) 1620 return RX_DROP_U_SPURIOUS_NOTIF; 1621 1622 return RX_DROP_U_SPURIOUS; 1623 } 1624 1625 return RX_CONTINUE; 1626 } 1627 1628 1629 static ieee80211_rx_result debug_noinline 1630 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1631 { 1632 struct ieee80211_local *local; 1633 struct ieee80211_hdr *hdr; 1634 struct sk_buff *skb; 1635 1636 local = rx->local; 1637 skb = rx->skb; 1638 hdr = (struct ieee80211_hdr *) skb->data; 1639 1640 if (!local->pspolling) 1641 return RX_CONTINUE; 1642 1643 if (!ieee80211_has_fromds(hdr->frame_control)) 1644 /* this is not from AP */ 1645 return RX_CONTINUE; 1646 1647 if (!ieee80211_is_data(hdr->frame_control)) 1648 return RX_CONTINUE; 1649 1650 if (!ieee80211_has_moredata(hdr->frame_control)) { 1651 /* AP has no more frames buffered for us */ 1652 local->pspolling = false; 1653 return RX_CONTINUE; 1654 } 1655 1656 /* more data bit is set, let's request a new frame from the AP */ 1657 ieee80211_send_pspoll(local, rx->sdata); 1658 1659 return RX_CONTINUE; 1660 } 1661 1662 static void sta_ps_start(struct sta_info *sta) 1663 { 1664 struct ieee80211_sub_if_data *sdata = sta->sdata; 1665 struct ieee80211_local *local = sdata->local; 1666 struct ps_data *ps; 1667 int tid; 1668 1669 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1670 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1671 ps = &sdata->bss->ps; 1672 else 1673 return; 1674 1675 atomic_inc(&ps->num_sta_ps); 1676 set_sta_flag(sta, WLAN_STA_PS_STA); 1677 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1678 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1679 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1680 sta->sta.addr, sta->sta.aid); 1681 1682 ieee80211_clear_fast_xmit(sta); 1683 1684 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1685 struct ieee80211_txq *txq = sta->sta.txq[tid]; 1686 struct txq_info *txqi = to_txq_info(txq); 1687 1688 spin_lock(&local->active_txq_lock[txq->ac]); 1689 if (!list_empty(&txqi->schedule_order)) 1690 list_del_init(&txqi->schedule_order); 1691 spin_unlock(&local->active_txq_lock[txq->ac]); 1692 1693 if (txq_has_queue(txq)) 1694 set_bit(tid, &sta->txq_buffered_tids); 1695 else 1696 clear_bit(tid, &sta->txq_buffered_tids); 1697 } 1698 } 1699 1700 static void sta_ps_end(struct sta_info *sta) 1701 { 1702 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1703 sta->sta.addr, sta->sta.aid); 1704 1705 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1706 /* 1707 * Clear the flag only if the other one is still set 1708 * so that the TX path won't start TX'ing new frames 1709 * directly ... In the case that the driver flag isn't 1710 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1711 */ 1712 clear_sta_flag(sta, WLAN_STA_PS_STA); 1713 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1714 sta->sta.addr, sta->sta.aid); 1715 return; 1716 } 1717 1718 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1719 clear_sta_flag(sta, WLAN_STA_PS_STA); 1720 ieee80211_sta_ps_deliver_wakeup(sta); 1721 } 1722 1723 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1724 { 1725 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1726 bool in_ps; 1727 1728 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1729 1730 /* Don't let the same PS state be set twice */ 1731 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1732 if ((start && in_ps) || (!start && !in_ps)) 1733 return -EINVAL; 1734 1735 if (start) 1736 sta_ps_start(sta); 1737 else 1738 sta_ps_end(sta); 1739 1740 return 0; 1741 } 1742 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1743 1744 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1745 { 1746 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1747 1748 if (test_sta_flag(sta, WLAN_STA_SP)) 1749 return; 1750 1751 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1752 ieee80211_sta_ps_deliver_poll_response(sta); 1753 else 1754 set_sta_flag(sta, WLAN_STA_PSPOLL); 1755 } 1756 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1757 1758 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1759 { 1760 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1761 int ac = ieee80211_ac_from_tid(tid); 1762 1763 /* 1764 * If this AC is not trigger-enabled do nothing unless the 1765 * driver is calling us after it already checked. 1766 * 1767 * NB: This could/should check a separate bitmap of trigger- 1768 * enabled queues, but for now we only implement uAPSD w/o 1769 * TSPEC changes to the ACs, so they're always the same. 1770 */ 1771 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1772 tid != IEEE80211_NUM_TIDS) 1773 return; 1774 1775 /* if we are in a service period, do nothing */ 1776 if (test_sta_flag(sta, WLAN_STA_SP)) 1777 return; 1778 1779 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1780 ieee80211_sta_ps_deliver_uapsd(sta); 1781 else 1782 set_sta_flag(sta, WLAN_STA_UAPSD); 1783 } 1784 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1785 1786 static ieee80211_rx_result debug_noinline 1787 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1788 { 1789 struct ieee80211_sub_if_data *sdata = rx->sdata; 1790 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1791 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1792 1793 if (!rx->sta) 1794 return RX_CONTINUE; 1795 1796 if (sdata->vif.type != NL80211_IFTYPE_AP && 1797 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1798 return RX_CONTINUE; 1799 1800 /* 1801 * The device handles station powersave, so don't do anything about 1802 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1803 * it to mac80211 since they're handled.) 1804 */ 1805 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1806 return RX_CONTINUE; 1807 1808 /* 1809 * Don't do anything if the station isn't already asleep. In 1810 * the uAPSD case, the station will probably be marked asleep, 1811 * in the PS-Poll case the station must be confused ... 1812 */ 1813 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1814 return RX_CONTINUE; 1815 1816 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1817 ieee80211_sta_pspoll(&rx->sta->sta); 1818 1819 /* Free PS Poll skb here instead of returning RX_DROP that would 1820 * count as an dropped frame. */ 1821 dev_kfree_skb(rx->skb); 1822 1823 return RX_QUEUED; 1824 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1825 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1826 ieee80211_has_pm(hdr->frame_control) && 1827 (ieee80211_is_data_qos(hdr->frame_control) || 1828 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1829 u8 tid = ieee80211_get_tid(hdr); 1830 1831 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1832 } 1833 1834 return RX_CONTINUE; 1835 } 1836 1837 static ieee80211_rx_result debug_noinline 1838 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1839 { 1840 struct sta_info *sta = rx->sta; 1841 struct link_sta_info *link_sta = rx->link_sta; 1842 struct sk_buff *skb = rx->skb; 1843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1844 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1845 int i; 1846 1847 if (!sta || !link_sta) 1848 return RX_CONTINUE; 1849 1850 /* 1851 * Update last_rx only for IBSS packets which are for the current 1852 * BSSID and for station already AUTHORIZED to avoid keeping the 1853 * current IBSS network alive in cases where other STAs start 1854 * using different BSSID. This will also give the station another 1855 * chance to restart the authentication/authorization in case 1856 * something went wrong the first time. 1857 */ 1858 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1859 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1860 NL80211_IFTYPE_ADHOC); 1861 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1862 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1863 link_sta->rx_stats.last_rx = jiffies; 1864 if (ieee80211_is_data_present(hdr->frame_control) && 1865 !is_multicast_ether_addr(hdr->addr1)) 1866 link_sta->rx_stats.last_rate = 1867 sta_stats_encode_rate(status); 1868 } 1869 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1870 link_sta->rx_stats.last_rx = jiffies; 1871 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && 1872 !is_multicast_ether_addr(hdr->addr1)) { 1873 /* 1874 * Mesh beacons will update last_rx when if they are found to 1875 * match the current local configuration when processed. 1876 */ 1877 link_sta->rx_stats.last_rx = jiffies; 1878 if (ieee80211_is_data_present(hdr->frame_control)) 1879 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1880 } 1881 1882 link_sta->rx_stats.fragments++; 1883 1884 u64_stats_update_begin(&link_sta->rx_stats.syncp); 1885 u64_stats_add(&link_sta->rx_stats.bytes, rx->skb->len); 1886 u64_stats_update_end(&link_sta->rx_stats.syncp); 1887 1888 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1889 link_sta->rx_stats.last_signal = status->signal; 1890 ewma_signal_add(&link_sta->rx_stats_avg.signal, 1891 -status->signal); 1892 } 1893 1894 if (status->chains) { 1895 link_sta->rx_stats.chains = status->chains; 1896 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1897 int signal = status->chain_signal[i]; 1898 1899 if (!(status->chains & BIT(i))) 1900 continue; 1901 1902 link_sta->rx_stats.chain_signal_last[i] = signal; 1903 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 1904 -signal); 1905 } 1906 } 1907 1908 if (ieee80211_is_s1g_beacon(hdr->frame_control)) 1909 return RX_CONTINUE; 1910 1911 /* 1912 * Change STA power saving mode only at the end of a frame 1913 * exchange sequence, and only for a data or management 1914 * frame as specified in IEEE 802.11-2016 11.2.3.2 1915 */ 1916 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1917 !ieee80211_has_morefrags(hdr->frame_control) && 1918 !is_multicast_ether_addr(hdr->addr1) && 1919 (ieee80211_is_mgmt(hdr->frame_control) || 1920 ieee80211_is_data(hdr->frame_control)) && 1921 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1922 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1923 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1924 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1925 if (!ieee80211_has_pm(hdr->frame_control)) 1926 sta_ps_end(sta); 1927 } else { 1928 if (ieee80211_has_pm(hdr->frame_control)) 1929 sta_ps_start(sta); 1930 } 1931 } 1932 1933 /* mesh power save support */ 1934 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1935 ieee80211_mps_rx_h_sta_process(sta, hdr); 1936 1937 /* 1938 * Drop (qos-)data::nullfunc frames silently, since they 1939 * are used only to control station power saving mode. 1940 */ 1941 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 1942 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1943 1944 /* 1945 * If we receive a 4-addr nullfunc frame from a STA 1946 * that was not moved to a 4-addr STA vlan yet send 1947 * the event to userspace and for older hostapd drop 1948 * the frame to the monitor interface. 1949 */ 1950 if (ieee80211_has_a4(hdr->frame_control) && 1951 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1952 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1953 !rx->sdata->u.vlan.sta))) { 1954 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1955 cfg80211_rx_unexpected_4addr_frame( 1956 rx->sdata->dev, sta->sta.addr, 1957 rx->link_id, GFP_ATOMIC); 1958 return RX_DROP_U_UNEXPECTED_4ADDR_FRAME; 1959 } 1960 /* 1961 * Update counter and free packet here to avoid 1962 * counting this as a dropped packed. 1963 */ 1964 link_sta->rx_stats.packets++; 1965 dev_kfree_skb(rx->skb); 1966 return RX_QUEUED; 1967 } 1968 1969 return RX_CONTINUE; 1970 } /* ieee80211_rx_h_sta_process */ 1971 1972 static struct ieee80211_key * 1973 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) 1974 { 1975 struct ieee80211_key *key = NULL; 1976 int idx2; 1977 1978 /* Make sure key gets set if either BIGTK key index is set so that 1979 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected 1980 * Beacon frames and Beacon frames that claim to use another BIGTK key 1981 * index (i.e., a key that we do not have). 1982 */ 1983 1984 if (idx < 0) { 1985 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; 1986 idx2 = idx + 1; 1987 } else { 1988 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1989 idx2 = idx + 1; 1990 else 1991 idx2 = idx - 1; 1992 } 1993 1994 if (rx->link_sta) 1995 key = rcu_dereference(rx->link_sta->gtk[idx]); 1996 if (!key) 1997 key = rcu_dereference(rx->link->gtk[idx]); 1998 if (!key && rx->link_sta) 1999 key = rcu_dereference(rx->link_sta->gtk[idx2]); 2000 if (!key) 2001 key = rcu_dereference(rx->link->gtk[idx2]); 2002 2003 return key; 2004 } 2005 2006 static ieee80211_rx_result debug_noinline 2007 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 2008 { 2009 struct sk_buff *skb = rx->skb; 2010 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2011 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2012 int keyidx; 2013 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL; 2014 struct ieee80211_key *sta_ptk = NULL; 2015 struct ieee80211_key *ptk_idx = NULL; 2016 int mmie_keyidx = -1; 2017 __le16 fc; 2018 2019 if (ieee80211_is_ext(hdr->frame_control)) 2020 return RX_CONTINUE; 2021 2022 /* 2023 * Key selection 101 2024 * 2025 * There are five types of keys: 2026 * - GTK (group keys) 2027 * - IGTK (group keys for management frames) 2028 * - BIGTK (group keys for Beacon frames) 2029 * - PTK (pairwise keys) 2030 * - STK (station-to-station pairwise keys) 2031 * 2032 * When selecting a key, we have to distinguish between multicast 2033 * (including broadcast) and unicast frames, the latter can only 2034 * use PTKs and STKs while the former always use GTKs, IGTKs, and 2035 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, 2036 * then unicast frames can also use key indices like GTKs. Hence, if we 2037 * don't have a PTK/STK we check the key index for a WEP key. 2038 * 2039 * Note that in a regular BSS, multicast frames are sent by the 2040 * AP only, associated stations unicast the frame to the AP first 2041 * which then multicasts it on their behalf. 2042 * 2043 * There is also a slight problem in IBSS mode: GTKs are negotiated 2044 * with each station, that is something we don't currently handle. 2045 * The spec seems to expect that one negotiates the same key with 2046 * every station but there's no such requirement; VLANs could be 2047 * possible. 2048 */ 2049 2050 /* start without a key */ 2051 rx->key = NULL; 2052 fc = hdr->frame_control; 2053 2054 if (rx->sta) { 2055 int keyid = rx->sta->ptk_idx; 2056 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 2057 2058 if (ieee80211_has_protected(fc) && 2059 !(status->flag & RX_FLAG_IV_STRIPPED)) { 2060 keyid = ieee80211_get_keyid(rx->skb); 2061 2062 if (unlikely(keyid < 0)) 2063 return RX_DROP_U_NO_KEY_ID; 2064 2065 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); 2066 } 2067 } 2068 2069 if (!ieee80211_has_protected(fc)) 2070 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 2071 2072 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 2073 rx->key = ptk_idx ? ptk_idx : sta_ptk; 2074 if ((status->flag & RX_FLAG_DECRYPTED) && 2075 (status->flag & RX_FLAG_IV_STRIPPED)) 2076 return RX_CONTINUE; 2077 /* Skip decryption if the frame is not protected. */ 2078 if (!ieee80211_has_protected(fc)) 2079 return RX_CONTINUE; 2080 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { 2081 /* Broadcast/multicast robust management frame / BIP */ 2082 if ((status->flag & RX_FLAG_DECRYPTED) && 2083 (status->flag & RX_FLAG_IV_STRIPPED)) 2084 return RX_CONTINUE; 2085 2086 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || 2087 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 2088 NUM_DEFAULT_BEACON_KEYS) { 2089 if (rx->sdata->dev) 2090 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2091 skb->data, 2092 skb->len); 2093 return RX_DROP_U_BAD_BCN_KEYIDX; 2094 } 2095 2096 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); 2097 if (!rx->key) 2098 return RX_CONTINUE; /* Beacon protection not in use */ 2099 } else if (mmie_keyidx >= 0) { 2100 /* Broadcast/multicast robust management frame / BIP */ 2101 if ((status->flag & RX_FLAG_DECRYPTED) && 2102 (status->flag & RX_FLAG_IV_STRIPPED)) 2103 return RX_CONTINUE; 2104 2105 if (mmie_keyidx < NUM_DEFAULT_KEYS || 2106 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 2107 return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */ 2108 if (rx->link_sta) { 2109 if (ieee80211_is_group_privacy_action(skb) && 2110 test_sta_flag(rx->sta, WLAN_STA_MFP)) 2111 return RX_DROP_U_UNPROTECTED; 2112 2113 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]); 2114 } 2115 if (!rx->key) 2116 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]); 2117 } else if (!ieee80211_has_protected(fc)) { 2118 /* 2119 * The frame was not protected, so skip decryption. However, we 2120 * need to set rx->key if there is a key that could have been 2121 * used so that the frame may be dropped if encryption would 2122 * have been expected. 2123 */ 2124 struct ieee80211_key *key = NULL; 2125 int i; 2126 2127 if (ieee80211_is_beacon(fc)) { 2128 key = ieee80211_rx_get_bigtk(rx, -1); 2129 } else if (ieee80211_is_mgmt(fc) && 2130 is_multicast_ether_addr(hdr->addr1)) { 2131 key = rcu_dereference(rx->link->default_mgmt_key); 2132 } else { 2133 if (rx->link_sta) { 2134 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2135 key = rcu_dereference(rx->link_sta->gtk[i]); 2136 if (key) 2137 break; 2138 } 2139 } 2140 if (!key) { 2141 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 2142 key = rcu_dereference(rx->link->gtk[i]); 2143 if (key) 2144 break; 2145 } 2146 } 2147 } 2148 if (key) 2149 rx->key = key; 2150 return RX_CONTINUE; 2151 } else { 2152 /* 2153 * The device doesn't give us the IV so we won't be 2154 * able to look up the key. That's ok though, we 2155 * don't need to decrypt the frame, we just won't 2156 * be able to keep statistics accurate. 2157 * Except for key threshold notifications, should 2158 * we somehow allow the driver to tell us which key 2159 * the hardware used if this flag is set? 2160 */ 2161 if ((status->flag & RX_FLAG_DECRYPTED) && 2162 (status->flag & RX_FLAG_IV_STRIPPED)) 2163 return RX_CONTINUE; 2164 2165 keyidx = ieee80211_get_keyid(rx->skb); 2166 2167 if (unlikely(keyidx < 0)) 2168 return RX_DROP_U_NO_KEY_ID; 2169 2170 /* check per-station GTK first, if multicast packet */ 2171 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta) 2172 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]); 2173 2174 /* if not found, try default key */ 2175 if (!rx->key) { 2176 if (is_multicast_ether_addr(hdr->addr1)) 2177 rx->key = rcu_dereference(rx->link->gtk[keyidx]); 2178 if (!rx->key) 2179 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 2180 2181 /* 2182 * RSNA-protected unicast frames should always be 2183 * sent with pairwise or station-to-station keys, 2184 * but for WEP we allow using a key index as well. 2185 */ 2186 if (rx->key && 2187 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2188 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2189 !is_multicast_ether_addr(hdr->addr1)) 2190 rx->key = NULL; 2191 } 2192 } 2193 2194 if (rx->key) { 2195 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2196 return RX_DROP_U_KEY_TAINTED; 2197 2198 /* TODO: add threshold stuff again */ 2199 } else { 2200 return RX_DROP_U_UNPROTECTED; 2201 } 2202 2203 switch (rx->key->conf.cipher) { 2204 case WLAN_CIPHER_SUITE_WEP40: 2205 case WLAN_CIPHER_SUITE_WEP104: 2206 result = ieee80211_crypto_wep_decrypt(rx); 2207 break; 2208 case WLAN_CIPHER_SUITE_TKIP: 2209 result = ieee80211_crypto_tkip_decrypt(rx); 2210 break; 2211 case WLAN_CIPHER_SUITE_CCMP: 2212 result = ieee80211_crypto_ccmp_decrypt( 2213 rx, IEEE80211_CCMP_MIC_LEN); 2214 break; 2215 case WLAN_CIPHER_SUITE_CCMP_256: 2216 result = ieee80211_crypto_ccmp_decrypt( 2217 rx, IEEE80211_CCMP_256_MIC_LEN); 2218 break; 2219 case WLAN_CIPHER_SUITE_AES_CMAC: 2220 result = ieee80211_crypto_aes_cmac_decrypt( 2221 rx, IEEE80211_CMAC_128_MIC_LEN); 2222 break; 2223 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2224 result = ieee80211_crypto_aes_cmac_decrypt( 2225 rx, IEEE80211_CMAC_256_MIC_LEN); 2226 break; 2227 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2228 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2229 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2230 break; 2231 case WLAN_CIPHER_SUITE_GCMP: 2232 case WLAN_CIPHER_SUITE_GCMP_256: 2233 result = ieee80211_crypto_gcmp_decrypt(rx); 2234 break; 2235 default: 2236 result = RX_DROP_U_BAD_CIPHER; 2237 } 2238 2239 /* the hdr variable is invalid after the decrypt handlers */ 2240 2241 /* either the frame has been decrypted or will be dropped */ 2242 status->flag |= RX_FLAG_DECRYPTED; 2243 2244 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) && 2245 rx->sdata->dev)) 2246 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2247 skb->data, skb->len); 2248 2249 return result; 2250 } 2251 2252 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) 2253 { 2254 int i; 2255 2256 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2257 skb_queue_head_init(&cache->entries[i].skb_list); 2258 } 2259 2260 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) 2261 { 2262 int i; 2263 2264 for (i = 0; i < ARRAY_SIZE(cache->entries); i++) 2265 __skb_queue_purge(&cache->entries[i].skb_list); 2266 } 2267 2268 static inline struct ieee80211_fragment_entry * 2269 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, 2270 unsigned int frag, unsigned int seq, int rx_queue, 2271 struct sk_buff **skb) 2272 { 2273 struct ieee80211_fragment_entry *entry; 2274 2275 entry = &cache->entries[cache->next++]; 2276 if (cache->next >= IEEE80211_FRAGMENT_MAX) 2277 cache->next = 0; 2278 2279 __skb_queue_purge(&entry->skb_list); 2280 2281 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2282 *skb = NULL; 2283 entry->first_frag_time = jiffies; 2284 entry->seq = seq; 2285 entry->rx_queue = rx_queue; 2286 entry->last_frag = frag; 2287 entry->check_sequential_pn = false; 2288 entry->extra_len = 0; 2289 2290 return entry; 2291 } 2292 2293 static inline struct ieee80211_fragment_entry * 2294 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, 2295 unsigned int frag, unsigned int seq, 2296 int rx_queue, struct ieee80211_hdr *hdr) 2297 { 2298 struct ieee80211_fragment_entry *entry; 2299 int i, idx; 2300 2301 idx = cache->next; 2302 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2303 struct ieee80211_hdr *f_hdr; 2304 struct sk_buff *f_skb; 2305 2306 idx--; 2307 if (idx < 0) 2308 idx = IEEE80211_FRAGMENT_MAX - 1; 2309 2310 entry = &cache->entries[idx]; 2311 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2312 entry->rx_queue != rx_queue || 2313 entry->last_frag + 1 != frag) 2314 continue; 2315 2316 f_skb = __skb_peek(&entry->skb_list); 2317 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2318 2319 /* 2320 * Check ftype and addresses are equal, else check next fragment 2321 */ 2322 if (((hdr->frame_control ^ f_hdr->frame_control) & 2323 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2324 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2325 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2326 continue; 2327 2328 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2329 __skb_queue_purge(&entry->skb_list); 2330 continue; 2331 } 2332 return entry; 2333 } 2334 2335 return NULL; 2336 } 2337 2338 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) 2339 { 2340 return rx->key && 2341 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2342 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2343 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2344 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2345 ieee80211_has_protected(fc); 2346 } 2347 2348 static ieee80211_rx_result debug_noinline 2349 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2350 { 2351 struct ieee80211_fragment_cache *cache = &rx->sdata->frags; 2352 struct ieee80211_hdr *hdr; 2353 u16 sc; 2354 __le16 fc; 2355 unsigned int frag, seq; 2356 struct ieee80211_fragment_entry *entry; 2357 struct sk_buff *skb; 2358 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2359 2360 hdr = (struct ieee80211_hdr *)rx->skb->data; 2361 fc = hdr->frame_control; 2362 2363 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) 2364 return RX_CONTINUE; 2365 2366 sc = le16_to_cpu(hdr->seq_ctrl); 2367 frag = sc & IEEE80211_SCTL_FRAG; 2368 2369 if (rx->sta) 2370 cache = &rx->sta->frags; 2371 2372 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2373 goto out; 2374 2375 if (is_multicast_ether_addr(hdr->addr1)) 2376 return RX_DROP_U_MCAST_FRAGMENT; 2377 2378 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2379 2380 if (skb_linearize(rx->skb)) 2381 return RX_DROP_U_OOM; 2382 2383 /* 2384 * skb_linearize() might change the skb->data and 2385 * previously cached variables (in this case, hdr) need to 2386 * be refreshed with the new data. 2387 */ 2388 hdr = (struct ieee80211_hdr *)rx->skb->data; 2389 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2390 2391 if (frag == 0) { 2392 /* This is the first fragment of a new frame. */ 2393 entry = ieee80211_reassemble_add(cache, frag, seq, 2394 rx->seqno_idx, &(rx->skb)); 2395 if (requires_sequential_pn(rx, fc)) { 2396 int queue = rx->security_idx; 2397 2398 /* Store CCMP/GCMP PN so that we can verify that the 2399 * next fragment has a sequential PN value. 2400 */ 2401 entry->check_sequential_pn = true; 2402 entry->is_protected = true; 2403 entry->key_color = rx->key->color; 2404 memcpy(entry->last_pn, 2405 rx->key->u.ccmp.rx_pn[queue], 2406 IEEE80211_CCMP_PN_LEN); 2407 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2408 u.ccmp.rx_pn) != 2409 offsetof(struct ieee80211_key, 2410 u.gcmp.rx_pn)); 2411 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2412 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2413 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2414 IEEE80211_GCMP_PN_LEN); 2415 } else if (rx->key && 2416 (ieee80211_has_protected(fc) || 2417 (status->flag & RX_FLAG_DECRYPTED))) { 2418 entry->is_protected = true; 2419 entry->key_color = rx->key->color; 2420 } 2421 return RX_QUEUED; 2422 } 2423 2424 /* This is a fragment for a frame that should already be pending in 2425 * fragment cache. Add this fragment to the end of the pending entry. 2426 */ 2427 entry = ieee80211_reassemble_find(cache, frag, seq, 2428 rx->seqno_idx, hdr); 2429 if (!entry) { 2430 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2431 return RX_DROP_U_DEFRAG_MISMATCH; 2432 } 2433 2434 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2435 * MPDU PN values are not incrementing in steps of 1." 2436 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2437 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2438 */ 2439 if (entry->check_sequential_pn) { 2440 int i; 2441 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2442 2443 if (!requires_sequential_pn(rx, fc)) 2444 return RX_DROP_U_NONSEQ_PN; 2445 2446 /* Prevent mixed key and fragment cache attacks */ 2447 if (entry->key_color != rx->key->color) 2448 return RX_DROP_U_BAD_KEY_COLOR; 2449 2450 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2451 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2452 pn[i]++; 2453 if (pn[i]) 2454 break; 2455 } 2456 2457 rpn = rx->ccm_gcm.pn; 2458 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2459 return RX_DROP_U_REPLAY; 2460 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2461 } else if (entry->is_protected && 2462 (!rx->key || 2463 (!ieee80211_has_protected(fc) && 2464 !(status->flag & RX_FLAG_DECRYPTED)) || 2465 rx->key->color != entry->key_color)) { 2466 /* Drop this as a mixed key or fragment cache attack, even 2467 * if for TKIP Michael MIC should protect us, and WEP is a 2468 * lost cause anyway. 2469 */ 2470 return RX_DROP_U_EXPECT_DEFRAG_PROT; 2471 } else if (entry->is_protected && rx->key && 2472 entry->key_color != rx->key->color && 2473 (status->flag & RX_FLAG_DECRYPTED)) { 2474 return RX_DROP_U_BAD_KEY_COLOR; 2475 } 2476 2477 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2478 __skb_queue_tail(&entry->skb_list, rx->skb); 2479 entry->last_frag = frag; 2480 entry->extra_len += rx->skb->len; 2481 if (ieee80211_has_morefrags(fc)) { 2482 rx->skb = NULL; 2483 return RX_QUEUED; 2484 } 2485 2486 rx->skb = __skb_dequeue(&entry->skb_list); 2487 if (skb_tailroom(rx->skb) < entry->extra_len) { 2488 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2489 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2490 GFP_ATOMIC))) { 2491 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2492 __skb_queue_purge(&entry->skb_list); 2493 return RX_DROP_U_OOM; 2494 } 2495 } 2496 while ((skb = __skb_dequeue(&entry->skb_list))) { 2497 skb_put_data(rx->skb, skb->data, skb->len); 2498 dev_kfree_skb(skb); 2499 } 2500 2501 out: 2502 ieee80211_led_rx(rx->local); 2503 if (rx->sta) 2504 rx->link_sta->rx_stats.packets++; 2505 return RX_CONTINUE; 2506 } 2507 2508 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2509 { 2510 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2511 return -EACCES; 2512 2513 return 0; 2514 } 2515 2516 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2517 { 2518 struct sk_buff *skb = rx->skb; 2519 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2520 2521 /* 2522 * Pass through unencrypted frames if the hardware has 2523 * decrypted them already. 2524 */ 2525 if (status->flag & RX_FLAG_DECRYPTED) 2526 return 0; 2527 2528 /* Drop unencrypted frames if key is set. */ 2529 if (unlikely(!ieee80211_has_protected(fc) && 2530 !ieee80211_is_any_nullfunc(fc) && 2531 ieee80211_is_data(fc) && rx->key)) 2532 return -EACCES; 2533 2534 return 0; 2535 } 2536 2537 VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result 2538 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2539 { 2540 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2541 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2542 __le16 fc = mgmt->frame_control; 2543 2544 /* 2545 * Pass through unencrypted frames if the hardware has 2546 * decrypted them already. 2547 */ 2548 if (status->flag & RX_FLAG_DECRYPTED) 2549 return RX_CONTINUE; 2550 2551 /* drop unicast protected dual (that wasn't protected) */ 2552 if (ieee80211_is_action(fc) && 2553 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION) 2554 return RX_DROP_U_UNPROT_DUAL; 2555 2556 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2557 if (unlikely(!ieee80211_has_protected(fc) && 2558 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) { 2559 if (ieee80211_is_deauth(fc) || 2560 ieee80211_is_disassoc(fc)) { 2561 /* 2562 * Permit unprotected deauth/disassoc frames 2563 * during 4-way-HS (key is installed after HS). 2564 */ 2565 if (!rx->key) 2566 return RX_CONTINUE; 2567 2568 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2569 rx->skb->data, 2570 rx->skb->len); 2571 } 2572 return RX_DROP_U_UNPROT_UCAST_MGMT; 2573 } 2574 /* BIP does not use Protected field, so need to check MMIE */ 2575 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2576 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2577 if (ieee80211_is_deauth(fc) || 2578 ieee80211_is_disassoc(fc)) 2579 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2580 rx->skb->data, 2581 rx->skb->len); 2582 return RX_DROP_U_UNPROT_MCAST_MGMT; 2583 } 2584 if (unlikely(ieee80211_is_beacon(fc) && rx->key && 2585 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2586 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2587 rx->skb->data, 2588 rx->skb->len); 2589 return RX_DROP_U_UNPROT_BEACON; 2590 } 2591 /* 2592 * When using MFP, Action frames are not allowed prior to 2593 * having configured keys. 2594 */ 2595 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2596 ieee80211_is_robust_mgmt_frame(rx->skb))) 2597 return RX_DROP_U_UNPROT_ACTION; 2598 2599 /* drop unicast public action frames when using MPF */ 2600 if (is_unicast_ether_addr(mgmt->da) && 2601 ieee80211_is_protected_dual_of_public_action(rx->skb)) 2602 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION; 2603 } 2604 2605 /* 2606 * Drop robust action frames before assoc regardless of MFP state, 2607 * after assoc we also have decided on MFP or not. 2608 */ 2609 if (ieee80211_is_action(fc) && 2610 ieee80211_is_robust_mgmt_frame(rx->skb) && 2611 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) 2612 return RX_DROP_U_UNPROT_ROBUST_ACTION; 2613 2614 /* 2615 * Drop unprotected (Re)Association Request/Response frame received from 2616 * an EPP Peer. 2617 */ 2618 if (!ieee80211_has_protected(fc) && 2619 ieee80211_require_encrypted_assoc(fc, rx->sta)) 2620 return RX_DROP_U_UNPROT_UCAST_MGMT; 2621 2622 return RX_CONTINUE; 2623 } 2624 EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt); 2625 2626 static ieee80211_rx_result 2627 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2628 { 2629 struct ieee80211_sub_if_data *sdata = rx->sdata; 2630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2631 bool check_port_control = false; 2632 struct ethhdr *ehdr; 2633 int ret; 2634 2635 *port_control = false; 2636 if (ieee80211_has_a4(hdr->frame_control) && 2637 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2638 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR; 2639 2640 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2641 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2642 if (!sdata->u.mgd.use_4addr) 2643 return RX_DROP_U_UNEXPECTED_STA_4ADDR; 2644 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2645 check_port_control = true; 2646 } 2647 2648 if (is_multicast_ether_addr(hdr->addr1) && 2649 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2650 return RX_DROP_U_UNEXPECTED_VLAN_MCAST; 2651 2652 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2653 if (ret < 0) 2654 return RX_DROP_U_INVALID_8023; 2655 2656 ehdr = (struct ethhdr *) rx->skb->data; 2657 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2658 *port_control = true; 2659 else if (check_port_control) 2660 return RX_DROP_U_NOT_PORT_CONTROL; 2661 2662 return RX_CONTINUE; 2663 } 2664 2665 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata, 2666 const u8 *addr, int *out_link_id) 2667 { 2668 unsigned int link_id; 2669 2670 /* non-MLO, or MLD address replaced by hardware */ 2671 if (ether_addr_equal(sdata->vif.addr, addr)) 2672 return true; 2673 2674 if (!ieee80211_vif_is_mld(&sdata->vif)) 2675 return false; 2676 2677 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) { 2678 struct ieee80211_bss_conf *conf; 2679 2680 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2681 2682 if (!conf) 2683 continue; 2684 if (ether_addr_equal(conf->addr, addr)) { 2685 if (out_link_id) 2686 *out_link_id = link_id; 2687 return true; 2688 } 2689 } 2690 2691 return false; 2692 } 2693 2694 /* 2695 * requires that rx->skb is a frame with ethernet header 2696 */ 2697 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2698 { 2699 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2700 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2701 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2702 2703 /* 2704 * Allow EAPOL frames to us/the PAE group address regardless of 2705 * whether the frame was encrypted or not, and always disallow 2706 * all other destination addresses for them. 2707 */ 2708 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) 2709 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) || 2710 ether_addr_equal(ehdr->h_dest, pae_group_addr); 2711 2712 if (ieee80211_802_1x_port_control(rx) || 2713 ieee80211_drop_unencrypted(rx, fc)) 2714 return false; 2715 2716 return true; 2717 } 2718 2719 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2720 struct ieee80211_rx_data *rx) 2721 { 2722 struct ieee80211_sub_if_data *sdata = rx->sdata; 2723 struct net_device *dev = sdata->dev; 2724 2725 if (unlikely((skb->protocol == sdata->control_port_protocol || 2726 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && 2727 !sdata->control_port_no_preauth)) && 2728 sdata->control_port_over_nl80211)) { 2729 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2730 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); 2731 2732 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id); 2733 dev_kfree_skb(skb); 2734 } else { 2735 struct ethhdr *ehdr = (void *)skb_mac_header(skb); 2736 2737 memset(skb->cb, 0, sizeof(skb->cb)); 2738 2739 /* 2740 * 802.1X over 802.11 requires that the authenticator address 2741 * be used for EAPOL frames. However, 802.1X allows the use of 2742 * the PAE group address instead. If the interface is part of 2743 * a bridge and we pass the frame with the PAE group address, 2744 * then the bridge will forward it to the network (even if the 2745 * client was not associated yet), which isn't supposed to 2746 * happen. 2747 * To avoid that, rewrite the destination address to our own 2748 * address, so that the authenticator (e.g. hostapd) will see 2749 * the frame, but bridge won't forward it anywhere else. Note 2750 * that due to earlier filtering, the only other address can 2751 * be the PAE group address, unless the hardware allowed them 2752 * through in 802.3 offloaded mode. 2753 */ 2754 if (unlikely(skb->protocol == sdata->control_port_protocol && 2755 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) 2756 ether_addr_copy(ehdr->h_dest, sdata->vif.addr); 2757 2758 /* deliver to local stack */ 2759 if (rx->list) 2760 list_add_tail(&skb->list, rx->list); 2761 else 2762 netif_receive_skb(skb); 2763 } 2764 } 2765 2766 /* 2767 * requires that rx->skb is a frame with ethernet header 2768 */ 2769 static void 2770 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2771 { 2772 struct ieee80211_sub_if_data *sdata = rx->sdata; 2773 struct net_device *dev = sdata->dev; 2774 struct sk_buff *skb, *xmit_skb; 2775 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2776 struct sta_info *dsta; 2777 2778 skb = rx->skb; 2779 xmit_skb = NULL; 2780 2781 dev_sw_netstats_rx_add(dev, skb->len); 2782 2783 if (rx->sta) { 2784 /* The seqno index has the same property as needed 2785 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2786 * for non-QoS-data frames. Here we know it's a data 2787 * frame, so count MSDUs. 2788 */ 2789 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp); 2790 u64_stats_inc(&rx->link_sta->rx_stats.msdu[rx->seqno_idx]); 2791 u64_stats_update_end(&rx->link_sta->rx_stats.syncp); 2792 } 2793 2794 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2795 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2796 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2797 ehdr->h_proto != rx->sdata->control_port_protocol && 2798 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2799 if (is_multicast_ether_addr(ehdr->h_dest) && 2800 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2801 /* 2802 * send multicast frames both to higher layers in 2803 * local net stack and back to the wireless medium 2804 */ 2805 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2806 if (!xmit_skb) 2807 net_info_ratelimited("%s: failed to clone multicast frame\n", 2808 dev->name); 2809 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2810 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2811 dsta = sta_info_get(sdata, ehdr->h_dest); 2812 if (dsta) { 2813 /* 2814 * The destination station is associated to 2815 * this AP (in this VLAN), so send the frame 2816 * directly to it and do not pass it to local 2817 * net stack. 2818 */ 2819 xmit_skb = skb; 2820 skb = NULL; 2821 } 2822 } 2823 } 2824 2825 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2826 if (skb) { 2827 /* 'align' will only take the values 0 or 2 here since all 2828 * frames are required to be aligned to 2-byte boundaries 2829 * when being passed to mac80211; the code here works just 2830 * as well if that isn't true, but mac80211 assumes it can 2831 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2832 */ 2833 int align; 2834 2835 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2836 if (align) { 2837 if (WARN_ON(skb_headroom(skb) < 3)) { 2838 dev_kfree_skb(skb); 2839 skb = NULL; 2840 } else { 2841 u8 *data = skb->data; 2842 size_t len = skb_headlen(skb); 2843 skb->data -= align; 2844 memmove(skb->data, data, len); 2845 skb_set_tail_pointer(skb, len); 2846 } 2847 } 2848 } 2849 #endif 2850 2851 if (skb) { 2852 skb->protocol = eth_type_trans(skb, dev); 2853 ieee80211_deliver_skb_to_local_stack(skb, rx); 2854 } 2855 2856 if (xmit_skb) { 2857 /* 2858 * Send to wireless media and increase priority by 256 to 2859 * keep the received priority instead of reclassifying 2860 * the frame (see cfg80211_classify8021d). 2861 */ 2862 xmit_skb->priority += 256; 2863 xmit_skb->protocol = htons(ETH_P_802_3); 2864 skb_reset_network_header(xmit_skb); 2865 skb_reset_mac_header(xmit_skb); 2866 dev_queue_xmit(xmit_skb); 2867 } 2868 } 2869 2870 #ifdef CONFIG_MAC80211_MESH 2871 static bool 2872 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata, 2873 struct sk_buff *skb, int hdrlen) 2874 { 2875 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2876 struct ieee80211_mesh_fast_tx_key key = { 2877 .type = MESH_FAST_TX_TYPE_FORWARDED 2878 }; 2879 struct ieee80211_mesh_fast_tx *entry; 2880 struct ieee80211s_hdr *mesh_hdr; 2881 struct tid_ampdu_tx *tid_tx; 2882 struct sta_info *sta; 2883 struct ethhdr eth; 2884 u8 tid; 2885 2886 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth)); 2887 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2888 ether_addr_copy(key.addr, mesh_hdr->eaddr1); 2889 else if (!(mesh_hdr->flags & MESH_FLAGS_AE)) 2890 ether_addr_copy(key.addr, skb->data); 2891 else 2892 return false; 2893 2894 entry = mesh_fast_tx_get(sdata, &key); 2895 if (!entry) 2896 return false; 2897 2898 sta = rcu_dereference(entry->mpath->next_hop); 2899 if (!sta) 2900 return false; 2901 2902 if (skb_linearize(skb)) 2903 return false; 2904 2905 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2906 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2907 if (tid_tx) { 2908 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2909 return false; 2910 2911 if (tid_tx->timeout) 2912 tid_tx->last_tx = jiffies; 2913 } 2914 2915 ieee80211_aggr_check(sdata, sta, skb); 2916 2917 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen, 2918 &skb->protocol)) 2919 hdrlen += ETH_ALEN; 2920 else 2921 skb->protocol = htons(skb->len - hdrlen); 2922 skb_set_network_header(skb, hdrlen + 2); 2923 2924 skb->dev = sdata->dev; 2925 memcpy(ð, skb->data, ETH_HLEN - 2); 2926 skb_pull(skb, 2); 2927 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx, 2928 eth.h_dest, eth.h_source); 2929 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2930 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2931 2932 return true; 2933 } 2934 #endif 2935 2936 static ieee80211_rx_result 2937 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, 2938 struct sk_buff *skb) 2939 { 2940 #ifdef CONFIG_MAC80211_MESH 2941 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2942 struct ieee80211_local *local = sdata->local; 2943 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA; 2944 struct ieee80211_hdr hdr = { 2945 .frame_control = cpu_to_le16(fc) 2946 }; 2947 struct ieee80211_hdr *fwd_hdr; 2948 struct ieee80211s_hdr *mesh_hdr; 2949 struct ieee80211_tx_info *info; 2950 struct sk_buff *fwd_skb; 2951 struct ethhdr *eth; 2952 bool multicast; 2953 int tailroom = 0; 2954 int hdrlen, mesh_hdrlen; 2955 u8 *qos; 2956 2957 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2958 return RX_CONTINUE; 2959 2960 if (!pskb_may_pull(skb, sizeof(*eth) + 6)) 2961 return RX_DROP_U_RUNT_MESH_DATA; 2962 2963 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth)); 2964 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr); 2965 2966 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen)) 2967 return RX_DROP_U_RUNT_MESH_DATA; 2968 2969 eth = (struct ethhdr *)skb->data; 2970 multicast = is_multicast_ether_addr(eth->h_dest); 2971 2972 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1); 2973 if (!mesh_hdr->ttl) 2974 return RX_DROP_U_MESH_NO_TTL; 2975 2976 /* frame is in RMC, don't forward */ 2977 if (is_multicast_ether_addr(eth->h_dest) && 2978 mesh_rmc_check(sdata, eth->h_source, mesh_hdr)) 2979 return RX_DROP_U_MESH_RMC; 2980 2981 /* forward packet */ 2982 if (sdata->crypto_tx_tailroom_needed_cnt) 2983 tailroom = IEEE80211_ENCRYPT_TAILROOM; 2984 2985 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2986 struct mesh_path *mppath; 2987 char *proxied_addr; 2988 bool update = false; 2989 2990 if (multicast) 2991 proxied_addr = mesh_hdr->eaddr1; 2992 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) 2993 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2994 proxied_addr = mesh_hdr->eaddr2; 2995 else 2996 return RX_DROP_U_MESH_BAD_AE; 2997 2998 rcu_read_lock(); 2999 mppath = mpp_path_lookup(sdata, proxied_addr); 3000 if (!mppath) { 3001 mpp_path_add(sdata, proxied_addr, eth->h_source); 3002 } else { 3003 spin_lock_bh(&mppath->state_lock); 3004 if (!ether_addr_equal(mppath->mpp, eth->h_source)) { 3005 memcpy(mppath->mpp, eth->h_source, ETH_ALEN); 3006 update = true; 3007 } 3008 mppath->exp_time = jiffies; 3009 spin_unlock_bh(&mppath->state_lock); 3010 } 3011 3012 /* flush fast xmit cache if the address path changed */ 3013 if (update) 3014 mesh_fast_tx_flush_addr(sdata, proxied_addr); 3015 3016 rcu_read_unlock(); 3017 } 3018 3019 /* Frame has reached destination. Don't forward */ 3020 if (ether_addr_equal(sdata->vif.addr, eth->h_dest)) 3021 goto rx_accept; 3022 3023 if (!--mesh_hdr->ttl) { 3024 if (multicast) 3025 goto rx_accept; 3026 3027 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 3028 return RX_DROP_U_MESH_TTL_EXPIRED; 3029 } 3030 3031 if (!ifmsh->mshcfg.dot11MeshForwarding) { 3032 if (is_multicast_ether_addr(eth->h_dest)) 3033 goto rx_accept; 3034 3035 return RX_DROP_U_MESH_NOT_FORWARDING; 3036 } 3037 3038 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]); 3039 3040 if (!multicast && 3041 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen)) 3042 return RX_QUEUED; 3043 3044 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control, 3045 eth->h_dest, eth->h_source); 3046 hdrlen = ieee80211_hdrlen(hdr.frame_control); 3047 if (multicast) { 3048 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth); 3049 3050 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head + 3051 IEEE80211_ENCRYPT_HEADROOM, 3052 tailroom, GFP_ATOMIC); 3053 if (!fwd_skb) 3054 goto rx_accept; 3055 } else { 3056 fwd_skb = skb; 3057 skb = NULL; 3058 3059 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr))) 3060 return RX_DROP_U_OOM; 3061 3062 if (skb_linearize(fwd_skb)) 3063 return RX_DROP_U_OOM; 3064 } 3065 3066 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr)); 3067 memcpy(fwd_hdr, &hdr, hdrlen - 2); 3068 qos = ieee80211_get_qos_ctl(fwd_hdr); 3069 qos[0] = qos[1] = 0; 3070 3071 skb_reset_mac_header(fwd_skb); 3072 hdrlen += mesh_hdrlen; 3073 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen, 3074 &fwd_skb->protocol)) 3075 hdrlen += ETH_ALEN; 3076 else 3077 fwd_skb->protocol = htons(fwd_skb->len - hdrlen); 3078 skb_set_network_header(fwd_skb, hdrlen + 2); 3079 3080 info = IEEE80211_SKB_CB(fwd_skb); 3081 memset(info, 0, sizeof(*info)); 3082 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3083 info->control.vif = &sdata->vif; 3084 info->control.jiffies = jiffies; 3085 fwd_skb->dev = sdata->dev; 3086 if (multicast) { 3087 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 3088 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 3089 /* update power mode indication when forwarding */ 3090 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 3091 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 3092 /* mesh power mode flags updated in mesh_nexthop_lookup */ 3093 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 3094 } else { 3095 /* unable to resolve next hop */ 3096 if (sta) 3097 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 3098 hdr.addr3, 0, 3099 WLAN_REASON_MESH_PATH_NOFORWARD, 3100 sta->sta.addr); 3101 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 3102 kfree_skb(fwd_skb); 3103 goto rx_accept; 3104 } 3105 3106 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 3107 ieee80211_set_qos_hdr(sdata, fwd_skb); 3108 ieee80211_add_pending_skb(local, fwd_skb); 3109 3110 rx_accept: 3111 if (!skb) 3112 return RX_QUEUED; 3113 3114 ieee80211_strip_8023_mesh_hdr(skb); 3115 #endif 3116 3117 return RX_CONTINUE; 3118 } 3119 3120 static ieee80211_rx_result debug_noinline 3121 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 3122 { 3123 struct net_device *dev = rx->sdata->dev; 3124 struct sk_buff *skb = rx->skb; 3125 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3126 __le16 fc = hdr->frame_control; 3127 struct sk_buff_head frame_list; 3128 struct ethhdr ethhdr; 3129 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 3130 3131 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3132 check_da = NULL; 3133 check_sa = NULL; 3134 } else switch (rx->sdata->vif.type) { 3135 case NL80211_IFTYPE_AP: 3136 case NL80211_IFTYPE_AP_VLAN: 3137 check_da = NULL; 3138 break; 3139 case NL80211_IFTYPE_STATION: 3140 if (!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 3141 check_sa = NULL; 3142 break; 3143 case NL80211_IFTYPE_MESH_POINT: 3144 check_sa = NULL; 3145 check_da = NULL; 3146 break; 3147 default: 3148 break; 3149 } 3150 3151 skb->dev = dev; 3152 __skb_queue_head_init(&frame_list); 3153 3154 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 3155 rx->sdata->vif.addr, 3156 rx->sdata->vif.type, 3157 data_offset, true)) 3158 return RX_DROP_U_BAD_AMSDU; 3159 3160 if (rx->sta->amsdu_mesh_control < 0) { 3161 s8 valid = -1; 3162 int i; 3163 3164 for (i = 0; i <= 2; i++) { 3165 if (!ieee80211_is_valid_amsdu(skb, i)) 3166 continue; 3167 3168 if (valid >= 0) { 3169 /* ambiguous */ 3170 valid = -1; 3171 break; 3172 } 3173 3174 valid = i; 3175 } 3176 3177 rx->sta->amsdu_mesh_control = valid; 3178 } 3179 3180 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 3181 rx->sdata->vif.type, 3182 rx->local->hw.extra_tx_headroom, 3183 check_da, check_sa, 3184 rx->sta->amsdu_mesh_control); 3185 3186 while (!skb_queue_empty(&frame_list)) { 3187 rx->skb = __skb_dequeue(&frame_list); 3188 3189 switch (ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb)) { 3190 case RX_QUEUED: 3191 break; 3192 case RX_CONTINUE: 3193 if (ieee80211_frame_allowed(rx, fc)) { 3194 ieee80211_deliver_skb(rx); 3195 break; 3196 } 3197 fallthrough; 3198 default: 3199 dev_kfree_skb(rx->skb); 3200 } 3201 } 3202 3203 return RX_QUEUED; 3204 } 3205 3206 static ieee80211_rx_result debug_noinline 3207 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 3208 { 3209 struct sk_buff *skb = rx->skb; 3210 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3211 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 3212 __le16 fc = hdr->frame_control; 3213 3214 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 3215 return RX_CONTINUE; 3216 3217 if (unlikely(!ieee80211_is_data(fc))) 3218 return RX_CONTINUE; 3219 3220 if (unlikely(!ieee80211_is_data_present(fc))) 3221 return RX_DROP_U_AMSDU_WITHOUT_DATA; 3222 3223 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 3224 switch (rx->sdata->vif.type) { 3225 case NL80211_IFTYPE_AP_VLAN: 3226 if (!rx->sdata->u.vlan.sta) 3227 return RX_DROP_U_BAD_4ADDR; 3228 break; 3229 case NL80211_IFTYPE_STATION: 3230 if (!rx->sdata->u.mgd.use_4addr) 3231 return RX_DROP_U_BAD_4ADDR; 3232 break; 3233 case NL80211_IFTYPE_MESH_POINT: 3234 break; 3235 default: 3236 return RX_DROP_U_BAD_4ADDR; 3237 } 3238 } 3239 3240 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta) 3241 return RX_DROP_U_BAD_AMSDU; 3242 3243 if (rx->key) { 3244 /* 3245 * We should not receive A-MSDUs on pre-HT connections, 3246 * and HT connections cannot use old ciphers. Thus drop 3247 * them, as in those cases we couldn't even have SPP 3248 * A-MSDUs or such. 3249 */ 3250 switch (rx->key->conf.cipher) { 3251 case WLAN_CIPHER_SUITE_WEP40: 3252 case WLAN_CIPHER_SUITE_WEP104: 3253 case WLAN_CIPHER_SUITE_TKIP: 3254 return RX_DROP_U_BAD_AMSDU_CIPHER; 3255 default: 3256 break; 3257 } 3258 } 3259 3260 return __ieee80211_rx_h_amsdu(rx, 0); 3261 } 3262 3263 static ieee80211_rx_result debug_noinline 3264 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 3265 { 3266 struct ieee80211_sub_if_data *sdata = rx->sdata; 3267 struct ieee80211_local *local = rx->local; 3268 struct net_device *dev = sdata->dev; 3269 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 3270 __le16 fc = hdr->frame_control; 3271 ieee80211_rx_result res; 3272 bool port_control; 3273 3274 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 3275 return RX_CONTINUE; 3276 3277 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 3278 return RX_DROP_U_NULL_DATA; 3279 3280 /* Send unexpected-4addr-frame event to hostapd */ 3281 if (ieee80211_has_a4(hdr->frame_control) && 3282 sdata->vif.type == NL80211_IFTYPE_AP) { 3283 if (rx->sta && 3284 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 3285 cfg80211_rx_unexpected_4addr_frame( 3286 rx->sdata->dev, rx->sta->sta.addr, rx->link_id, 3287 GFP_ATOMIC); 3288 return RX_DROP_U_UNEXPECTED_4ADDR; 3289 } 3290 3291 res = __ieee80211_data_to_8023(rx, &port_control); 3292 if (unlikely(res != RX_CONTINUE)) 3293 return res; 3294 3295 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 3296 if (res != RX_CONTINUE) 3297 return res; 3298 3299 if (!ieee80211_frame_allowed(rx, fc)) 3300 return RX_DROP_U_PORT_CONTROL; 3301 3302 /* directly handle TDLS channel switch requests/responses */ 3303 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 3304 cpu_to_be16(ETH_P_TDLS))) { 3305 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 3306 3307 if (pskb_may_pull(rx->skb, 3308 offsetof(struct ieee80211_tdls_data, u)) && 3309 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 3310 tf->category == WLAN_CATEGORY_TDLS && 3311 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 3312 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 3313 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS); 3314 __ieee80211_queue_skb_to_iface(sdata, rx->link_id, 3315 rx->sta, rx->skb); 3316 return RX_QUEUED; 3317 } 3318 } 3319 3320 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3321 unlikely(port_control) && sdata->bss) { 3322 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 3323 u.ap); 3324 dev = sdata->dev; 3325 rx->sdata = sdata; 3326 } 3327 3328 rx->skb->dev = dev; 3329 3330 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3331 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 3332 !is_multicast_ether_addr( 3333 ((struct ethhdr *)rx->skb->data)->h_dest) && 3334 (!local->scanning && 3335 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 3336 mod_timer(&local->dynamic_ps_timer, jiffies + 3337 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 3338 3339 ieee80211_deliver_skb(rx); 3340 3341 return RX_QUEUED; 3342 } 3343 3344 static ieee80211_rx_result debug_noinline 3345 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 3346 { 3347 struct sk_buff *skb = rx->skb; 3348 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 3349 struct tid_ampdu_rx *tid_agg_rx; 3350 u16 start_seq_num; 3351 u16 tid; 3352 3353 if (likely(!ieee80211_is_ctl(bar->frame_control))) 3354 return RX_CONTINUE; 3355 3356 if (ieee80211_is_back_req(bar->frame_control)) { 3357 struct { 3358 __le16 control, start_seq_num; 3359 } __packed bar_data; 3360 struct ieee80211_event event = { 3361 .type = BAR_RX_EVENT, 3362 }; 3363 3364 if (!rx->sta) 3365 return RX_DROP_U_UNKNOWN_STA; 3366 3367 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 3368 &bar_data, sizeof(bar_data))) 3369 return RX_DROP_U_RUNT_BAR; 3370 3371 tid = le16_to_cpu(bar_data.control) >> 12; 3372 3373 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 3374 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 3375 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 3376 WLAN_BACK_RECIPIENT, 3377 WLAN_REASON_QSTA_REQUIRE_SETUP, 3378 ieee80211_s1g_use_ndp_ba(rx->sdata, 3379 rx->sta)); 3380 3381 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 3382 if (!tid_agg_rx) 3383 return RX_DROP_U_BAR_OUTSIDE_SESSION; 3384 3385 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 3386 event.u.ba.tid = tid; 3387 event.u.ba.ssn = start_seq_num; 3388 event.u.ba.sta = &rx->sta->sta; 3389 3390 /* reset session timer */ 3391 if (tid_agg_rx->timeout) 3392 mod_timer(&tid_agg_rx->session_timer, 3393 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 3394 3395 spin_lock(&tid_agg_rx->reorder_lock); 3396 /* release stored frames up to start of BAR */ 3397 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 3398 start_seq_num, frames); 3399 spin_unlock(&tid_agg_rx->reorder_lock); 3400 3401 drv_event_callback(rx->local, rx->sdata, &event); 3402 3403 kfree_skb(skb); 3404 return RX_QUEUED; 3405 } 3406 3407 return RX_DROP_U_CTRL_FRAME; 3408 } 3409 3410 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 3411 struct ieee80211_mgmt *mgmt, 3412 size_t len) 3413 { 3414 struct ieee80211_local *local = sdata->local; 3415 struct sk_buff *skb; 3416 struct ieee80211_mgmt *resp; 3417 3418 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 3419 /* Not to own unicast address */ 3420 return; 3421 } 3422 3423 if (!ether_addr_equal(mgmt->sa, sdata->vif.cfg.ap_addr) || 3424 !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) { 3425 /* Not from the current AP or not associated yet. */ 3426 return; 3427 } 3428 3429 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) { 3430 /* Too short SA Query request frame */ 3431 return; 3432 } 3433 3434 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 3435 if (skb == NULL) 3436 return; 3437 3438 skb_reserve(skb, local->hw.extra_tx_headroom); 3439 resp = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(sa_query)); 3440 memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN); 3441 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 3442 memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN); 3443 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3444 IEEE80211_STYPE_ACTION); 3445 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 3446 resp->u.action.action_code = WLAN_ACTION_SA_QUERY_RESPONSE; 3447 memcpy(resp->u.action.sa_query.trans_id, 3448 mgmt->u.action.sa_query.trans_id, 3449 WLAN_SA_QUERY_TR_ID_LEN); 3450 3451 ieee80211_tx_skb(sdata, skb); 3452 } 3453 3454 static void 3455 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx) 3456 { 3457 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3458 struct ieee80211_bss_conf *bss_conf; 3459 const struct element *ie; 3460 size_t baselen; 3461 3462 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy, 3463 NL80211_EXT_FEATURE_BSS_COLOR)) 3464 return; 3465 3466 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION)) 3467 return; 3468 3469 bss_conf = rx->link->conf; 3470 if (bss_conf->csa_active || bss_conf->color_change_active || 3471 !bss_conf->he_bss_color.enabled) 3472 return; 3473 3474 baselen = mgmt->u.beacon.variable - rx->skb->data; 3475 if (baselen > rx->skb->len) 3476 return; 3477 3478 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 3479 mgmt->u.beacon.variable, 3480 rx->skb->len - baselen); 3481 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) && 3482 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) { 3483 const struct ieee80211_he_operation *he_oper; 3484 u8 color; 3485 3486 he_oper = (void *)(ie->data + 1); 3487 if (le32_get_bits(he_oper->he_oper_params, 3488 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED)) 3489 return; 3490 3491 color = le32_get_bits(he_oper->he_oper_params, 3492 IEEE80211_HE_OPERATION_BSS_COLOR_MASK); 3493 if (color == bss_conf->he_bss_color.color) 3494 ieee80211_obss_color_collision_notify(&rx->sdata->vif, 3495 BIT_ULL(color), 3496 bss_conf->link_id); 3497 } 3498 } 3499 3500 static ieee80211_rx_result debug_noinline 3501 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 3502 { 3503 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3504 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3505 3506 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) 3507 return RX_CONTINUE; 3508 3509 /* 3510 * From here on, look only at management frames. 3511 * Data and control frames are already handled, 3512 * and unknown (reserved) frames are useless. 3513 */ 3514 if (rx->skb->len < 24) 3515 return RX_DROP_U_RUNT_MGMT; 3516 3517 if (!ieee80211_is_mgmt(mgmt->frame_control)) 3518 return RX_DROP_U_EXPECTED_MGMT; 3519 3520 /* drop too small action frames */ 3521 if (ieee80211_is_action(mgmt->frame_control) && 3522 rx->skb->len < IEEE80211_MIN_ACTION_SIZE(category)) 3523 return RX_DROP_U_RUNT_ACTION; 3524 3525 /* Drop non-broadcast Beacon frames */ 3526 if (ieee80211_is_beacon(mgmt->frame_control) && 3527 !is_broadcast_ether_addr(mgmt->da)) 3528 return RX_DROP_U_NONBCAST_BEACON; 3529 3530 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 3531 ieee80211_is_beacon(mgmt->frame_control) && 3532 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 3533 int sig = 0; 3534 3535 /* sw bss color collision detection */ 3536 ieee80211_rx_check_bss_color_collision(rx); 3537 3538 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3539 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3540 sig = status->signal; 3541 3542 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, 3543 rx->skb->data, rx->skb->len, 3544 ieee80211_rx_status_to_khz(status), 3545 sig); 3546 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3547 } 3548 3549 return ieee80211_drop_unencrypted_mgmt(rx); 3550 } 3551 3552 static bool 3553 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx) 3554 { 3555 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data; 3556 struct ieee80211_sub_if_data *sdata = rx->sdata; 3557 3558 /* TWT actions are only supported in AP for the moment */ 3559 if (sdata->vif.type != NL80211_IFTYPE_AP) 3560 return false; 3561 3562 if (!rx->local->ops->add_twt_setup) 3563 return false; 3564 3565 if (!sdata->vif.bss_conf.twt_responder) 3566 return false; 3567 3568 if (!rx->sta) 3569 return false; 3570 3571 switch (mgmt->u.action.action_code) { 3572 case WLAN_S1G_TWT_SETUP: { 3573 struct ieee80211_twt_setup *twt; 3574 3575 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3576 sizeof(struct ieee80211_twt_setup) + 3577 2 /* TWT req_type agrt */) 3578 break; 3579 3580 twt = (void *)mgmt->u.action.s1g.variable; 3581 if (twt->element_id != WLAN_EID_S1G_TWT) 3582 break; 3583 3584 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 3585 3 + /* token + tlv */ 3586 twt->length) 3587 break; 3588 3589 return true; /* queue the frame */ 3590 } 3591 case WLAN_S1G_TWT_TEARDOWN: 3592 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE(action_code) + 1) 3593 break; 3594 3595 return true; /* queue the frame */ 3596 default: 3597 break; 3598 } 3599 3600 return false; 3601 } 3602 3603 static ieee80211_rx_result debug_noinline 3604 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3605 { 3606 struct ieee80211_local *local = rx->local; 3607 struct ieee80211_sub_if_data *sdata = rx->sdata; 3608 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3609 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3610 int len = rx->skb->len; 3611 3612 if (!ieee80211_is_action(mgmt->frame_control)) 3613 return RX_CONTINUE; 3614 3615 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3616 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3617 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3618 return RX_DROP_U_ACTION_UNKNOWN_SRC; 3619 3620 switch (mgmt->u.action.category) { 3621 case WLAN_CATEGORY_HT: 3622 /* reject HT action frames from stations not supporting HT 3623 * or not HE Capable 3624 */ 3625 if (!rx->link_sta->pub->ht_cap.ht_supported && 3626 !rx->link_sta->pub->he_cap.has_he) 3627 goto invalid; 3628 3629 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3630 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3631 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3632 sdata->vif.type != NL80211_IFTYPE_AP && 3633 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3634 break; 3635 3636 /* verify action & smps_control/chanwidth are present */ 3637 if (len < IEEE80211_MIN_ACTION_SIZE(ht_smps)) 3638 goto invalid; 3639 3640 switch (mgmt->u.action.action_code) { 3641 case WLAN_HT_ACTION_SMPS: { 3642 struct ieee80211_supported_band *sband; 3643 enum ieee80211_smps_mode smps_mode; 3644 struct sta_opmode_info sta_opmode = {}; 3645 3646 if (sdata->vif.type != NL80211_IFTYPE_AP && 3647 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3648 goto handled; 3649 3650 /* convert to HT capability */ 3651 switch (mgmt->u.action.ht_smps.smps_control) { 3652 case WLAN_HT_SMPS_CONTROL_DISABLED: 3653 smps_mode = IEEE80211_SMPS_OFF; 3654 break; 3655 case WLAN_HT_SMPS_CONTROL_STATIC: 3656 smps_mode = IEEE80211_SMPS_STATIC; 3657 break; 3658 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3659 smps_mode = IEEE80211_SMPS_DYNAMIC; 3660 break; 3661 default: 3662 goto invalid; 3663 } 3664 3665 /* if no change do nothing */ 3666 if (rx->link_sta->pub->smps_mode == smps_mode) 3667 goto handled; 3668 rx->link_sta->pub->smps_mode = smps_mode; 3669 sta_opmode.smps_mode = 3670 ieee80211_smps_mode_to_smps_mode(smps_mode); 3671 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3672 3673 sband = rx->local->hw.wiphy->bands[status->band]; 3674 3675 rate_control_rate_update(local, sband, rx->link_sta, 3676 IEEE80211_RC_SMPS_CHANGED); 3677 cfg80211_sta_opmode_change_notify(sdata->dev, 3678 rx->sta->addr, 3679 &sta_opmode, 3680 GFP_ATOMIC); 3681 goto handled; 3682 } 3683 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3684 u8 chanwidth = mgmt->u.action.ht_notify_cw.chanwidth; 3685 3686 if (chanwidth != IEEE80211_HT_CHANWIDTH_20MHZ && 3687 chanwidth != IEEE80211_HT_CHANWIDTH_ANY) 3688 goto invalid; 3689 3690 /* If it doesn't support 40 MHz it can't change ... */ 3691 if (!(rx->link_sta->pub->ht_cap.cap & 3692 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3693 goto handled; 3694 3695 goto queue; 3696 } 3697 default: 3698 goto invalid; 3699 } 3700 3701 break; 3702 case WLAN_CATEGORY_PUBLIC: 3703 case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION: 3704 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3705 goto invalid; 3706 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3707 break; 3708 if (!rx->sta) 3709 break; 3710 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) 3711 break; 3712 if (mgmt->u.action.action_code != 3713 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3714 break; 3715 if (len < IEEE80211_MIN_ACTION_SIZE(ext_chan_switch)) 3716 goto invalid; 3717 goto queue; 3718 case WLAN_CATEGORY_VHT: 3719 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3720 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3721 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3722 sdata->vif.type != NL80211_IFTYPE_AP && 3723 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3724 break; 3725 3726 /* verify action code is present */ 3727 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3728 goto invalid; 3729 3730 switch (mgmt->u.action.action_code) { 3731 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3732 /* verify opmode is present */ 3733 if (len < IEEE80211_MIN_ACTION_SIZE(vht_opmode_notif)) 3734 goto invalid; 3735 goto queue; 3736 } 3737 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3738 if (len < IEEE80211_MIN_ACTION_SIZE(vht_group_notif)) 3739 goto invalid; 3740 goto queue; 3741 } 3742 default: 3743 break; 3744 } 3745 break; 3746 case WLAN_CATEGORY_BACK: 3747 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3748 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3749 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3750 sdata->vif.type != NL80211_IFTYPE_AP && 3751 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3752 break; 3753 3754 /* verify action_code is present */ 3755 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3756 break; 3757 3758 switch (mgmt->u.action.action_code) { 3759 case WLAN_ACTION_ADDBA_REQ: 3760 case WLAN_ACTION_NDP_ADDBA_REQ: 3761 if (len < IEEE80211_MIN_ACTION_SIZE(addba_req)) 3762 goto invalid; 3763 break; 3764 case WLAN_ACTION_ADDBA_RESP: 3765 case WLAN_ACTION_NDP_ADDBA_RESP: 3766 if (len < IEEE80211_MIN_ACTION_SIZE(addba_resp)) 3767 goto invalid; 3768 break; 3769 case WLAN_ACTION_DELBA: 3770 case WLAN_ACTION_NDP_DELBA: 3771 if (len < IEEE80211_MIN_ACTION_SIZE(delba)) 3772 goto invalid; 3773 break; 3774 default: 3775 goto invalid; 3776 } 3777 3778 goto queue; 3779 case WLAN_CATEGORY_SPECTRUM_MGMT: 3780 /* verify action_code is present */ 3781 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3782 break; 3783 3784 switch (mgmt->u.action.action_code) { 3785 case WLAN_ACTION_SPCT_MSR_REQ: 3786 if (status->band != NL80211_BAND_5GHZ) 3787 break; 3788 3789 if (len < IEEE80211_MIN_ACTION_SIZE(measurement)) 3790 break; 3791 3792 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3793 break; 3794 3795 ieee80211_process_measurement_req(sdata, mgmt, len); 3796 goto handled; 3797 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3798 u8 *bssid; 3799 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 3800 break; 3801 3802 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3803 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3804 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3805 break; 3806 3807 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3808 bssid = sdata->deflink.u.mgd.bssid; 3809 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3810 bssid = sdata->u.ibss.bssid; 3811 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3812 bssid = mgmt->sa; 3813 else 3814 break; 3815 3816 if (!ether_addr_equal(mgmt->bssid, bssid)) 3817 break; 3818 3819 goto queue; 3820 } 3821 } 3822 break; 3823 case WLAN_CATEGORY_SELF_PROTECTED: 3824 if (len < IEEE80211_MIN_ACTION_SIZE(self_prot)) 3825 break; 3826 3827 switch (mgmt->u.action.action_code) { 3828 case WLAN_SP_MESH_PEERING_OPEN: 3829 case WLAN_SP_MESH_PEERING_CLOSE: 3830 case WLAN_SP_MESH_PEERING_CONFIRM: 3831 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3832 goto invalid; 3833 if (sdata->u.mesh.user_mpm) 3834 /* userspace handles this frame */ 3835 break; 3836 goto queue; 3837 case WLAN_SP_MGK_INFORM: 3838 case WLAN_SP_MGK_ACK: 3839 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3840 goto invalid; 3841 break; 3842 } 3843 break; 3844 case WLAN_CATEGORY_MESH_ACTION: 3845 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3846 break; 3847 3848 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3849 break; 3850 if (mesh_action_is_path_sel(mgmt) && 3851 !mesh_path_sel_is_hwmp(sdata)) 3852 break; 3853 goto queue; 3854 case WLAN_CATEGORY_S1G: 3855 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3856 break; 3857 3858 switch (mgmt->u.action.action_code) { 3859 case WLAN_S1G_TWT_SETUP: 3860 case WLAN_S1G_TWT_TEARDOWN: 3861 if (ieee80211_process_rx_twt_action(rx)) 3862 goto queue; 3863 break; 3864 default: 3865 break; 3866 } 3867 break; 3868 case WLAN_CATEGORY_PROTECTED_EHT: 3869 if (len < IEEE80211_MIN_ACTION_SIZE(action_code)) 3870 break; 3871 3872 switch (mgmt->u.action.action_code) { 3873 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 3874 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3875 break; 3876 3877 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_req)) 3878 goto invalid; 3879 goto queue; 3880 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 3881 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3882 break; 3883 3884 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_res)) 3885 goto invalid; 3886 goto queue; 3887 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 3888 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3889 break; 3890 3891 if (len < IEEE80211_MIN_ACTION_SIZE(ttlm_tear_down)) 3892 goto invalid; 3893 goto queue; 3894 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 3895 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3896 break; 3897 3898 /* The reconfiguration response action frame must 3899 * least one 'Status Duple' entry (3 octets) 3900 */ 3901 if (len < IEEE80211_MIN_ACTION_SIZE(ml_reconf_resp) + 3) 3902 goto invalid; 3903 goto queue; 3904 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 3905 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3906 break; 3907 3908 if (len < IEEE80211_MIN_ACTION_SIZE(epcs) + 3909 IEEE80211_EPCS_ENA_RESP_BODY_LEN) 3910 goto invalid; 3911 goto queue; 3912 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 3913 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3914 break; 3915 3916 if (len < IEEE80211_MIN_ACTION_SIZE(epcs)) 3917 goto invalid; 3918 goto queue; 3919 case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF: 3920 if (sdata->vif.type != NL80211_IFTYPE_AP) 3921 break; 3922 3923 if (len < IEEE80211_MIN_ACTION_SIZE(eml_omn)) 3924 goto invalid; 3925 goto queue; 3926 default: 3927 break; 3928 } 3929 break; 3930 } 3931 3932 return RX_CONTINUE; 3933 3934 invalid: 3935 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3936 /* will return in the next handlers */ 3937 return RX_CONTINUE; 3938 3939 handled: 3940 if (rx->sta) 3941 rx->link_sta->rx_stats.packets++; 3942 dev_kfree_skb(rx->skb); 3943 return RX_QUEUED; 3944 3945 queue: 3946 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 3947 return RX_QUEUED; 3948 } 3949 3950 static ieee80211_rx_result debug_noinline 3951 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3952 { 3953 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3954 struct cfg80211_rx_info info = { 3955 .freq = ieee80211_rx_status_to_khz(status), 3956 .buf = rx->skb->data, 3957 .len = rx->skb->len, 3958 .link_id = rx->link_id, 3959 .have_link_id = rx->link_id >= 0, 3960 }; 3961 3962 /* skip known-bad action frames and return them in the next handler */ 3963 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3964 return RX_CONTINUE; 3965 3966 /* 3967 * Getting here means the kernel doesn't know how to handle 3968 * it, but maybe userspace does ... include returned frames 3969 * so userspace can register for those to know whether ones 3970 * it transmitted were processed or returned. 3971 */ 3972 3973 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3974 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3975 info.sig_dbm = status->signal; 3976 3977 if (ieee80211_is_timing_measurement(rx->skb) || 3978 ieee80211_is_ftm(rx->skb)) { 3979 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp); 3980 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp); 3981 } 3982 3983 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) { 3984 if (rx->sta) 3985 rx->link_sta->rx_stats.packets++; 3986 dev_kfree_skb(rx->skb); 3987 return RX_QUEUED; 3988 } 3989 3990 return RX_CONTINUE; 3991 } 3992 3993 static ieee80211_rx_result debug_noinline 3994 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) 3995 { 3996 struct ieee80211_sub_if_data *sdata = rx->sdata; 3997 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3998 int len = rx->skb->len; 3999 4000 if (!ieee80211_is_action(mgmt->frame_control)) 4001 return RX_CONTINUE; 4002 4003 switch (mgmt->u.action.category) { 4004 case WLAN_CATEGORY_SA_QUERY: 4005 if (len < IEEE80211_MIN_ACTION_SIZE(sa_query)) 4006 break; 4007 4008 switch (mgmt->u.action.action_code) { 4009 case WLAN_ACTION_SA_QUERY_REQUEST: 4010 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4011 break; 4012 ieee80211_process_sa_query_req(sdata, mgmt, len); 4013 goto handled; 4014 } 4015 break; 4016 } 4017 4018 return RX_CONTINUE; 4019 4020 handled: 4021 if (rx->sta) 4022 rx->link_sta->rx_stats.packets++; 4023 dev_kfree_skb(rx->skb); 4024 return RX_QUEUED; 4025 } 4026 4027 static ieee80211_rx_result debug_noinline 4028 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 4029 { 4030 struct ieee80211_local *local = rx->local; 4031 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 4032 struct sk_buff *nskb; 4033 struct ieee80211_sub_if_data *sdata = rx->sdata; 4034 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4035 4036 if (!ieee80211_is_action(mgmt->frame_control)) 4037 return RX_CONTINUE; 4038 4039 /* 4040 * For AP mode, hostapd is responsible for handling any action 4041 * frames that we didn't handle, including returning unknown 4042 * ones. For all other modes we will return them to the sender, 4043 * setting the 0x80 bit in the action category, as required by 4044 * 802.11-2012 9.24.4. 4045 * Newer versions of hostapd use the management frame registration 4046 * mechanisms and old cooked monitor interface is no longer supported. 4047 */ 4048 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 4049 (sdata->vif.type == NL80211_IFTYPE_AP || 4050 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 4051 return RX_DROP_U_MALFORMED_ACTION; 4052 4053 if (is_multicast_ether_addr(mgmt->da)) 4054 return RX_DROP_U_UNKNOWN_MCAST_ACTION; 4055 4056 /* do not return rejected action frames */ 4057 if (mgmt->u.action.category & 0x80) 4058 return RX_DROP_U_REJECTED_ACTION_RESPONSE; 4059 4060 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 4061 GFP_ATOMIC); 4062 if (nskb) { 4063 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 4064 4065 nmgmt->u.action.category |= 0x80; 4066 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 4067 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 4068 4069 memset(nskb->cb, 0, sizeof(nskb->cb)); 4070 4071 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 4072 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 4073 4074 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 4075 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 4076 IEEE80211_TX_CTL_NO_CCK_RATE; 4077 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 4078 info->hw_queue = 4079 local->hw.offchannel_tx_hw_queue; 4080 } 4081 4082 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1, 4083 status->band); 4084 } 4085 4086 return RX_DROP_U_UNKNOWN_ACTION_REJECTED; 4087 } 4088 4089 static ieee80211_rx_result debug_noinline 4090 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) 4091 { 4092 struct ieee80211_sub_if_data *sdata = rx->sdata; 4093 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 4094 4095 if (!ieee80211_is_ext(hdr->frame_control)) 4096 return RX_CONTINUE; 4097 4098 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4099 return RX_DROP_U_UNEXPECTED_EXT_FRAME; 4100 4101 /* for now only beacons are ext, so queue them */ 4102 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4103 4104 return RX_QUEUED; 4105 } 4106 4107 static ieee80211_rx_result debug_noinline 4108 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 4109 { 4110 struct ieee80211_sub_if_data *sdata = rx->sdata; 4111 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 4112 __le16 stype; 4113 4114 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 4115 4116 if (!ieee80211_vif_is_mesh(&sdata->vif) && 4117 sdata->vif.type != NL80211_IFTYPE_ADHOC && 4118 sdata->vif.type != NL80211_IFTYPE_OCB && 4119 sdata->vif.type != NL80211_IFTYPE_STATION) 4120 return RX_DROP_U_UNHANDLED_MGMT; 4121 4122 switch (stype) { 4123 case cpu_to_le16(IEEE80211_STYPE_AUTH): 4124 case cpu_to_le16(IEEE80211_STYPE_BEACON): 4125 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 4126 /* process for all: mesh, mlme, ibss */ 4127 break; 4128 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 4129 if (is_multicast_ether_addr(mgmt->da) && 4130 !is_broadcast_ether_addr(mgmt->da)) 4131 return RX_DROP_U_MCAST_DEAUTH; 4132 4133 /* process only for station/IBSS */ 4134 if (sdata->vif.type != NL80211_IFTYPE_STATION && 4135 sdata->vif.type != NL80211_IFTYPE_ADHOC) 4136 return RX_DROP_U_UNHANDLED_DEAUTH; 4137 break; 4138 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 4139 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 4140 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 4141 if (is_multicast_ether_addr(mgmt->da) && 4142 !is_broadcast_ether_addr(mgmt->da)) 4143 return RX_DROP_U_MCAST_DISASSOC; 4144 4145 /* process only for station */ 4146 if (sdata->vif.type != NL80211_IFTYPE_STATION) 4147 return RX_DROP_U_UNHANDLED_DISASSOC; 4148 break; 4149 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 4150 /* process only for ibss and mesh */ 4151 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 4152 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 4153 return RX_DROP_U_UNHANDLED_PREQ; 4154 break; 4155 default: 4156 return RX_DROP_U_UNHANDLED_MGMT_STYPE; 4157 } 4158 4159 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb); 4160 4161 return RX_QUEUED; 4162 } 4163 4164 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 4165 ieee80211_rx_result res) 4166 { 4167 if (res == RX_QUEUED) { 4168 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 4169 return; 4170 } 4171 4172 if (res != RX_CONTINUE) { 4173 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 4174 if (rx->sta) 4175 rx->link_sta->rx_stats.dropped++; 4176 } 4177 4178 kfree_skb_reason(rx->skb, (__force u32)res); 4179 } 4180 4181 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 4182 struct sk_buff_head *frames) 4183 { 4184 ieee80211_rx_result res; 4185 struct sk_buff *skb; 4186 4187 #define CALL_RXH(rxh) \ 4188 do { \ 4189 res = rxh(rx); \ 4190 if (res != RX_CONTINUE) \ 4191 goto rxh_next; \ 4192 } while (0) 4193 4194 /* Lock here to avoid hitting all of the data used in the RX 4195 * path (e.g. key data, station data, ...) concurrently when 4196 * a frame is released from the reorder buffer due to timeout 4197 * from the timer, potentially concurrently with RX from the 4198 * driver. 4199 */ 4200 spin_lock_bh(&rx->local->rx_path_lock); 4201 4202 while ((skb = __skb_dequeue(frames))) { 4203 /* 4204 * all the other fields are valid across frames 4205 * that belong to an aMPDU since they are on the 4206 * same TID from the same station 4207 */ 4208 rx->skb = skb; 4209 4210 if (WARN_ON_ONCE(!rx->link)) { 4211 res = RX_DROP_U_NO_LINK; 4212 goto rxh_next; 4213 } 4214 4215 CALL_RXH(ieee80211_rx_h_check_more_data); 4216 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 4217 CALL_RXH(ieee80211_rx_h_sta_process); 4218 CALL_RXH(ieee80211_rx_h_decrypt); 4219 CALL_RXH(ieee80211_rx_h_defragment); 4220 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 4221 /* must be after MMIC verify so header is counted in MPDU mic */ 4222 CALL_RXH(ieee80211_rx_h_amsdu); 4223 CALL_RXH(ieee80211_rx_h_data); 4224 4225 /* special treatment -- needs the queue */ 4226 res = ieee80211_rx_h_ctrl(rx, frames); 4227 if (res != RX_CONTINUE) 4228 goto rxh_next; 4229 4230 CALL_RXH(ieee80211_rx_h_mgmt_check); 4231 CALL_RXH(ieee80211_rx_h_action); 4232 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 4233 CALL_RXH(ieee80211_rx_h_action_post_userspace); 4234 CALL_RXH(ieee80211_rx_h_action_return); 4235 CALL_RXH(ieee80211_rx_h_ext); 4236 CALL_RXH(ieee80211_rx_h_mgmt); 4237 4238 rxh_next: 4239 ieee80211_rx_handlers_result(rx, res); 4240 4241 #undef CALL_RXH 4242 } 4243 4244 spin_unlock_bh(&rx->local->rx_path_lock); 4245 } 4246 4247 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 4248 { 4249 struct sk_buff_head reorder_release; 4250 ieee80211_rx_result res; 4251 4252 __skb_queue_head_init(&reorder_release); 4253 4254 #define CALL_RXH(rxh) \ 4255 do { \ 4256 res = rxh(rx); \ 4257 if (res != RX_CONTINUE) \ 4258 goto rxh_next; \ 4259 } while (0) 4260 4261 CALL_RXH(ieee80211_rx_h_check_dup); 4262 CALL_RXH(ieee80211_rx_h_check); 4263 4264 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 4265 4266 ieee80211_rx_handlers(rx, &reorder_release); 4267 return; 4268 4269 rxh_next: 4270 ieee80211_rx_handlers_result(rx, res); 4271 4272 #undef CALL_RXH 4273 } 4274 4275 static bool 4276 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id) 4277 { 4278 return !!(sta->valid_links & BIT(link_id)); 4279 } 4280 4281 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx, 4282 u8 link_id) 4283 { 4284 rx->link_id = link_id; 4285 rx->link = rcu_dereference(rx->sdata->link[link_id]); 4286 4287 if (!rx->sta) 4288 return rx->link; 4289 4290 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id)) 4291 return false; 4292 4293 rx->link_sta = rcu_dereference(rx->sta->link[link_id]); 4294 4295 return rx->link && rx->link_sta; 4296 } 4297 4298 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx, 4299 struct sta_info *sta, int link_id) 4300 { 4301 rx->link_id = link_id; 4302 rx->sta = sta; 4303 4304 if (sta) { 4305 rx->local = sta->sdata->local; 4306 if (!rx->sdata) 4307 rx->sdata = sta->sdata; 4308 rx->link_sta = &sta->deflink; 4309 } else { 4310 rx->link_sta = NULL; 4311 } 4312 4313 if (link_id < 0) { 4314 if (ieee80211_vif_is_mld(&rx->sdata->vif) && 4315 sta && !sta->sta.valid_links) 4316 rx->link = 4317 rcu_dereference(rx->sdata->link[sta->deflink.link_id]); 4318 else 4319 rx->link = &rx->sdata->deflink; 4320 } else if (!ieee80211_rx_data_set_link(rx, link_id)) { 4321 return false; 4322 } 4323 4324 return true; 4325 } 4326 4327 /* 4328 * This function makes calls into the RX path, therefore 4329 * it has to be invoked under RCU read lock. 4330 */ 4331 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 4332 { 4333 struct sk_buff_head frames; 4334 struct ieee80211_rx_data rx = { 4335 /* This is OK -- must be QoS data frame */ 4336 .security_idx = tid, 4337 .seqno_idx = tid, 4338 }; 4339 struct tid_ampdu_rx *tid_agg_rx; 4340 int link_id = -1; 4341 4342 /* FIXME: statistics won't be right with this */ 4343 if (sta->sta.valid_links) 4344 link_id = ffs(sta->sta.valid_links) - 1; 4345 4346 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 4347 return; 4348 4349 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4350 if (!tid_agg_rx) 4351 return; 4352 4353 __skb_queue_head_init(&frames); 4354 4355 spin_lock(&tid_agg_rx->reorder_lock); 4356 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4357 spin_unlock(&tid_agg_rx->reorder_lock); 4358 4359 if (!skb_queue_empty(&frames)) { 4360 struct ieee80211_event event = { 4361 .type = BA_FRAME_TIMEOUT, 4362 .u.ba.tid = tid, 4363 .u.ba.sta = &sta->sta, 4364 }; 4365 drv_event_callback(rx.local, rx.sdata, &event); 4366 } 4367 4368 ieee80211_rx_handlers(&rx, &frames); 4369 } 4370 4371 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 4372 u16 ssn, u64 filtered, 4373 u16 received_mpdus) 4374 { 4375 struct ieee80211_local *local; 4376 struct sta_info *sta; 4377 struct tid_ampdu_rx *tid_agg_rx; 4378 struct sk_buff_head frames; 4379 struct ieee80211_rx_data rx = { 4380 /* This is OK -- must be QoS data frame */ 4381 .security_idx = tid, 4382 .seqno_idx = tid, 4383 }; 4384 int i, diff; 4385 4386 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 4387 return; 4388 4389 __skb_queue_head_init(&frames); 4390 4391 sta = container_of(pubsta, struct sta_info, sta); 4392 4393 local = sta->sdata->local; 4394 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64, 4395 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n", 4396 local->hw.max_rx_aggregation_subframes); 4397 4398 if (!ieee80211_rx_data_set_sta(&rx, sta, -1)) 4399 return; 4400 4401 rcu_read_lock(); 4402 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 4403 if (!tid_agg_rx) 4404 goto out; 4405 4406 spin_lock_bh(&tid_agg_rx->reorder_lock); 4407 4408 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 4409 int release; 4410 4411 /* release all frames in the reorder buffer */ 4412 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 4413 IEEE80211_SN_MODULO; 4414 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 4415 release, &frames); 4416 /* update ssn to match received ssn */ 4417 tid_agg_rx->head_seq_num = ssn; 4418 } else { 4419 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 4420 &frames); 4421 } 4422 4423 /* handle the case that received ssn is behind the mac ssn. 4424 * it can be tid_agg_rx->buf_size behind and still be valid */ 4425 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 4426 if (diff >= tid_agg_rx->buf_size) { 4427 tid_agg_rx->reorder_buf_filtered = 0; 4428 goto release; 4429 } 4430 filtered = filtered >> diff; 4431 ssn += diff; 4432 4433 /* update bitmap */ 4434 for (i = 0; i < tid_agg_rx->buf_size; i++) { 4435 int index = (ssn + i) % tid_agg_rx->buf_size; 4436 4437 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 4438 if (filtered & BIT_ULL(i)) 4439 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 4440 } 4441 4442 /* now process also frames that the filter marking released */ 4443 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 4444 4445 release: 4446 spin_unlock_bh(&tid_agg_rx->reorder_lock); 4447 4448 ieee80211_rx_handlers(&rx, &frames); 4449 4450 out: 4451 rcu_read_unlock(); 4452 } 4453 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 4454 4455 /* main receive path */ 4456 4457 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr) 4458 { 4459 return ether_addr_equal(raddr, addr) || 4460 is_broadcast_ether_addr(raddr); 4461 } 4462 4463 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 4464 { 4465 struct ieee80211_sub_if_data *sdata = rx->sdata; 4466 struct sk_buff *skb = rx->skb; 4467 struct ieee80211_hdr *hdr = (void *)skb->data; 4468 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4469 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 4470 bool multicast = is_multicast_ether_addr(hdr->addr1) || 4471 ieee80211_is_s1g_beacon(hdr->frame_control); 4472 4473 switch (sdata->vif.type) { 4474 case NL80211_IFTYPE_STATION: 4475 if (!bssid && !sdata->u.mgd.use_4addr) 4476 return false; 4477 if (ieee80211_is_first_frag(hdr->seq_ctrl) && 4478 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) 4479 return false; 4480 if (multicast) 4481 return true; 4482 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id); 4483 case NL80211_IFTYPE_ADHOC: 4484 if (!bssid) 4485 return false; 4486 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 4487 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || 4488 !is_valid_ether_addr(hdr->addr2)) 4489 return false; 4490 if (ieee80211_is_beacon(hdr->frame_control)) 4491 return true; 4492 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 4493 return false; 4494 if (!multicast && 4495 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 4496 return false; 4497 if (!rx->sta) { 4498 int rate_idx; 4499 if (status->encoding != RX_ENC_LEGACY) 4500 rate_idx = 0; /* TODO: HT/VHT rates */ 4501 else 4502 rate_idx = status->rate_idx; 4503 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 4504 BIT(rate_idx)); 4505 } 4506 return true; 4507 case NL80211_IFTYPE_OCB: 4508 if (!bssid) 4509 return false; 4510 if (!ieee80211_is_data_present(hdr->frame_control)) 4511 return false; 4512 if (!is_broadcast_ether_addr(bssid)) 4513 return false; 4514 if (!multicast && 4515 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 4516 return false; 4517 /* reject invalid/our STA address */ 4518 if (!is_valid_ether_addr(hdr->addr2) || 4519 ether_addr_equal(sdata->dev->dev_addr, hdr->addr2)) 4520 return false; 4521 if (!rx->sta) { 4522 int rate_idx; 4523 if (status->encoding != RX_ENC_LEGACY) 4524 rate_idx = 0; /* TODO: HT rates */ 4525 else 4526 rate_idx = status->rate_idx; 4527 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 4528 BIT(rate_idx)); 4529 } 4530 return true; 4531 case NL80211_IFTYPE_MESH_POINT: 4532 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 4533 return false; 4534 if (multicast) 4535 return true; 4536 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 4537 case NL80211_IFTYPE_AP_VLAN: 4538 case NL80211_IFTYPE_AP: 4539 if (!bssid) 4540 return ieee80211_is_our_addr(sdata, hdr->addr1, 4541 &rx->link_id); 4542 4543 if (!is_broadcast_ether_addr(bssid) && 4544 !ieee80211_is_our_addr(sdata, bssid, NULL)) { 4545 /* 4546 * Accept public action frames even when the 4547 * BSSID doesn't match, this is used for P2P 4548 * and location updates. Note that mac80211 4549 * itself never looks at these frames. 4550 */ 4551 if (!multicast && 4552 !ieee80211_is_our_addr(sdata, hdr->addr1, 4553 &rx->link_id)) 4554 return false; 4555 if (ieee80211_is_public_action(hdr, skb->len)) 4556 return true; 4557 return ieee80211_is_beacon(hdr->frame_control); 4558 } 4559 4560 if (!ieee80211_has_tods(hdr->frame_control)) { 4561 /* ignore data frames to TDLS-peers */ 4562 if (ieee80211_is_data(hdr->frame_control)) 4563 return false; 4564 /* ignore action frames to TDLS-peers */ 4565 if (ieee80211_is_action(hdr->frame_control) && 4566 !is_broadcast_ether_addr(bssid) && 4567 !ether_addr_equal(bssid, hdr->addr1)) 4568 return false; 4569 } 4570 4571 /* 4572 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 4573 * the BSSID - we've checked that already but may have accepted 4574 * the wildcard (ff:ff:ff:ff:ff:ff). 4575 * 4576 * It also says: 4577 * The BSSID of the Data frame is determined as follows: 4578 * a) If the STA is contained within an AP or is associated 4579 * with an AP, the BSSID is the address currently in use 4580 * by the STA contained in the AP. 4581 * 4582 * So we should not accept data frames with an address that's 4583 * multicast. 4584 * 4585 * Accepting it also opens a security problem because stations 4586 * could encrypt it with the GTK and inject traffic that way. 4587 */ 4588 if (ieee80211_is_data(hdr->frame_control) && multicast) 4589 return false; 4590 4591 return true; 4592 case NL80211_IFTYPE_P2P_DEVICE: 4593 return ieee80211_is_public_action(hdr, skb->len) || 4594 ieee80211_is_probe_req(hdr->frame_control) || 4595 ieee80211_is_probe_resp(hdr->frame_control) || 4596 ieee80211_is_beacon(hdr->frame_control) || 4597 (ieee80211_is_auth(hdr->frame_control) && 4598 ether_addr_equal(sdata->vif.addr, hdr->addr1)); 4599 case NL80211_IFTYPE_NAN: 4600 /* Accept only frames that are addressed to the NAN cluster 4601 * (based on the Cluster ID). From these frames, accept only 4602 * action frames or authentication frames that are addressed to 4603 * the local NAN interface. 4604 */ 4605 return memcmp(sdata->wdev.u.nan.cluster_id, 4606 hdr->addr3, ETH_ALEN) == 0 && 4607 (ieee80211_is_public_action(hdr, skb->len) || 4608 (ieee80211_is_auth(hdr->frame_control) && 4609 ether_addr_equal(sdata->vif.addr, hdr->addr1))); 4610 case NL80211_IFTYPE_NAN_DATA: 4611 return false; 4612 default: 4613 break; 4614 } 4615 4616 WARN_ON_ONCE(1); 4617 return false; 4618 } 4619 4620 void ieee80211_check_fast_rx(struct sta_info *sta) 4621 { 4622 struct ieee80211_sub_if_data *sdata = sta->sdata; 4623 struct ieee80211_local *local = sdata->local; 4624 struct ieee80211_key *key; 4625 struct ieee80211_fast_rx fastrx = { 4626 .dev = sdata->dev, 4627 .vif_type = sdata->vif.type, 4628 .control_port_protocol = sdata->control_port_protocol, 4629 }, *old, *new = NULL; 4630 u32 offload_flags; 4631 bool set_offload = false; 4632 bool assign = false; 4633 bool offload; 4634 4635 /* use sparse to check that we don't return without updating */ 4636 __acquire(check_fast_rx); 4637 4638 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 4639 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 4640 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 4641 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 4642 4643 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 4644 4645 /* fast-rx doesn't do reordering */ 4646 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 4647 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 4648 goto clear; 4649 4650 switch (sdata->vif.type) { 4651 case NL80211_IFTYPE_STATION: 4652 if (sta->sta.tdls) { 4653 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4654 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4655 fastrx.expected_ds_bits = 0; 4656 } else { 4657 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 4658 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 4659 fastrx.expected_ds_bits = 4660 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4661 } 4662 4663 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 4664 fastrx.expected_ds_bits |= 4665 cpu_to_le16(IEEE80211_FCTL_TODS); 4666 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4667 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4668 } 4669 4670 if (!sdata->u.mgd.powersave) 4671 break; 4672 4673 /* software powersave is a huge mess, avoid all of it */ 4674 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 4675 goto clear; 4676 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 4677 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 4678 goto clear; 4679 break; 4680 case NL80211_IFTYPE_AP_VLAN: 4681 case NL80211_IFTYPE_AP: 4682 /* parallel-rx requires this, at least with calls to 4683 * ieee80211_sta_ps_transition() 4684 */ 4685 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 4686 goto clear; 4687 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4688 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 4689 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 4690 4691 fastrx.internal_forward = 4692 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 4693 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 4694 !sdata->u.vlan.sta); 4695 4696 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4697 sdata->u.vlan.sta) { 4698 fastrx.expected_ds_bits |= 4699 cpu_to_le16(IEEE80211_FCTL_FROMDS); 4700 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4701 fastrx.internal_forward = 0; 4702 } 4703 4704 break; 4705 case NL80211_IFTYPE_MESH_POINT: 4706 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS | 4707 IEEE80211_FCTL_TODS); 4708 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 4709 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 4710 break; 4711 default: 4712 goto clear; 4713 } 4714 4715 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4716 goto clear; 4717 4718 rcu_read_lock(); 4719 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4720 if (!key) 4721 key = rcu_dereference(sdata->default_unicast_key); 4722 if (key) { 4723 switch (key->conf.cipher) { 4724 case WLAN_CIPHER_SUITE_TKIP: 4725 /* we don't want to deal with MMIC in fast-rx */ 4726 goto clear_rcu; 4727 case WLAN_CIPHER_SUITE_CCMP: 4728 case WLAN_CIPHER_SUITE_CCMP_256: 4729 case WLAN_CIPHER_SUITE_GCMP: 4730 case WLAN_CIPHER_SUITE_GCMP_256: 4731 break; 4732 default: 4733 /* We also don't want to deal with 4734 * WEP or cipher scheme. 4735 */ 4736 goto clear_rcu; 4737 } 4738 4739 fastrx.key = true; 4740 fastrx.icv_len = key->conf.icv_len; 4741 } 4742 4743 assign = true; 4744 clear_rcu: 4745 rcu_read_unlock(); 4746 clear: 4747 __release(check_fast_rx); 4748 4749 if (assign) 4750 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4751 4752 offload_flags = get_bss_sdata(sdata)->vif.offload_flags; 4753 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED; 4754 4755 if (assign && offload) 4756 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4757 else 4758 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); 4759 4760 if (set_offload) 4761 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); 4762 4763 spin_lock_bh(&sta->lock); 4764 old = rcu_dereference_protected(sta->fast_rx, true); 4765 rcu_assign_pointer(sta->fast_rx, new); 4766 spin_unlock_bh(&sta->lock); 4767 4768 if (old) 4769 kfree_rcu(old, rcu_head); 4770 } 4771 4772 void ieee80211_clear_fast_rx(struct sta_info *sta) 4773 { 4774 struct ieee80211_fast_rx *old; 4775 4776 spin_lock_bh(&sta->lock); 4777 old = rcu_dereference_protected(sta->fast_rx, true); 4778 RCU_INIT_POINTER(sta->fast_rx, NULL); 4779 spin_unlock_bh(&sta->lock); 4780 4781 if (old) 4782 kfree_rcu(old, rcu_head); 4783 } 4784 4785 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4786 { 4787 struct ieee80211_local *local = sdata->local; 4788 struct sta_info *sta; 4789 4790 lockdep_assert_wiphy(local->hw.wiphy); 4791 4792 list_for_each_entry(sta, &local->sta_list, list) { 4793 if (sdata != sta->sdata && 4794 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4795 continue; 4796 ieee80211_check_fast_rx(sta); 4797 } 4798 } 4799 4800 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4801 { 4802 struct ieee80211_local *local = sdata->local; 4803 4804 lockdep_assert_wiphy(local->hw.wiphy); 4805 4806 __ieee80211_check_fast_rx_iface(sdata); 4807 } 4808 4809 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, 4810 struct ieee80211_fast_rx *fast_rx, 4811 int orig_len) 4812 { 4813 struct ieee80211_sta_rx_stats *stats; 4814 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 4815 struct sta_info *sta = rx->sta; 4816 struct link_sta_info *link_sta; 4817 struct sk_buff *skb = rx->skb; 4818 void *sa = skb->data + ETH_ALEN; 4819 void *da = skb->data; 4820 4821 if (rx->link_id >= 0) { 4822 link_sta = rcu_dereference(sta->link[rx->link_id]); 4823 if (WARN_ON_ONCE(!link_sta)) { 4824 dev_kfree_skb(rx->skb); 4825 return; 4826 } 4827 } else { 4828 link_sta = &sta->deflink; 4829 } 4830 4831 stats = &link_sta->rx_stats; 4832 if (fast_rx->uses_rss) 4833 stats = this_cpu_ptr(link_sta->pcpu_rx_stats); 4834 4835 /* statistics part of ieee80211_rx_h_sta_process() */ 4836 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4837 stats->last_signal = status->signal; 4838 if (!fast_rx->uses_rss) 4839 ewma_signal_add(&link_sta->rx_stats_avg.signal, 4840 -status->signal); 4841 } 4842 4843 if (status->chains) { 4844 int i; 4845 4846 stats->chains = status->chains; 4847 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4848 int signal = status->chain_signal[i]; 4849 4850 if (!(status->chains & BIT(i))) 4851 continue; 4852 4853 stats->chain_signal_last[i] = signal; 4854 if (!fast_rx->uses_rss) 4855 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i], 4856 -signal); 4857 } 4858 } 4859 /* end of statistics */ 4860 4861 stats->last_rx = jiffies; 4862 stats->last_rate = sta_stats_encode_rate(status); 4863 4864 stats->fragments++; 4865 stats->packets++; 4866 4867 skb->dev = fast_rx->dev; 4868 4869 dev_sw_netstats_rx_add(fast_rx->dev, skb->len); 4870 4871 /* The seqno index has the same property as needed 4872 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4873 * for non-QoS-data frames. Here we know it's a data 4874 * frame, so count MSDUs. 4875 */ 4876 u64_stats_update_begin(&stats->syncp); 4877 u64_stats_inc(&stats->msdu[rx->seqno_idx]); 4878 u64_stats_add(&stats->bytes, orig_len); 4879 u64_stats_update_end(&stats->syncp); 4880 4881 if (fast_rx->internal_forward) { 4882 struct sk_buff *xmit_skb = NULL; 4883 if (is_multicast_ether_addr(da)) { 4884 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4885 } else if (!ether_addr_equal(da, sa) && 4886 sta_info_get(rx->sdata, da)) { 4887 xmit_skb = skb; 4888 skb = NULL; 4889 } 4890 4891 if (xmit_skb) { 4892 /* 4893 * Send to wireless media and increase priority by 256 4894 * to keep the received priority instead of 4895 * reclassifying the frame (see cfg80211_classify8021d). 4896 */ 4897 xmit_skb->priority += 256; 4898 xmit_skb->protocol = htons(ETH_P_802_3); 4899 skb_reset_network_header(xmit_skb); 4900 skb_reset_mac_header(xmit_skb); 4901 dev_queue_xmit(xmit_skb); 4902 } 4903 4904 if (!skb) 4905 return; 4906 } 4907 4908 /* deliver to local stack */ 4909 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4910 ieee80211_deliver_skb_to_local_stack(skb, rx); 4911 } 4912 4913 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4914 struct ieee80211_fast_rx *fast_rx) 4915 { 4916 struct sk_buff *skb = rx->skb; 4917 struct ieee80211_hdr *hdr = (void *)skb->data; 4918 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4919 static ieee80211_rx_result res; 4920 int orig_len = skb->len; 4921 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4922 int snap_offs = hdrlen; 4923 struct { 4924 u8 snap[sizeof(rfc1042_header)]; 4925 __be16 proto; 4926 } *payload __aligned(2); 4927 struct { 4928 u8 da[ETH_ALEN]; 4929 u8 sa[ETH_ALEN]; 4930 } addrs __aligned(2); 4931 struct ieee80211_sta_rx_stats *stats; 4932 4933 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4934 * to a common data structure; drivers can implement that per queue 4935 * but we don't have that information in mac80211 4936 */ 4937 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4938 return false; 4939 4940 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4941 4942 /* If using encryption, we also need to have: 4943 * - PN_VALIDATED: similar, but the implementation is tricky 4944 * - DECRYPTED: necessary for PN_VALIDATED 4945 */ 4946 if (fast_rx->key && 4947 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4948 return false; 4949 4950 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4951 return false; 4952 4953 if (unlikely(ieee80211_is_frag(hdr))) 4954 return false; 4955 4956 /* Since our interface address cannot be multicast, this 4957 * implicitly also rejects multicast frames without the 4958 * explicit check. 4959 * 4960 * We shouldn't get any *data* frames not addressed to us 4961 * (AP mode will accept multicast *management* frames), but 4962 * punting here will make it go through the full checks in 4963 * ieee80211_accept_frame(). 4964 */ 4965 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4966 return false; 4967 4968 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4969 IEEE80211_FCTL_TODS)) != 4970 fast_rx->expected_ds_bits) 4971 return false; 4972 4973 /* assign the key to drop unencrypted frames (later) 4974 * and strip the IV/MIC if necessary 4975 */ 4976 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4977 /* GCMP header length is the same */ 4978 snap_offs += IEEE80211_CCMP_HDR_LEN; 4979 } 4980 4981 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) && 4982 !(status->rx_flags & IEEE80211_RX_AMSDU)) { 4983 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4984 return false; 4985 4986 payload = (void *)(skb->data + snap_offs); 4987 4988 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4989 return false; 4990 4991 /* Don't handle these here since they require special code. 4992 * Accept AARP and IPX even though they should come with a 4993 * bridge-tunnel header - but if we get them this way then 4994 * there's little point in discarding them. 4995 */ 4996 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4997 payload->proto == fast_rx->control_port_protocol)) 4998 return false; 4999 } 5000 5001 /* after this point, don't punt to the slowpath! */ 5002 5003 if (fast_rx->uses_rss) 5004 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats); 5005 else 5006 stats = &rx->link_sta->rx_stats; 5007 5008 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 5009 pskb_trim(skb, skb->len - fast_rx->icv_len)) 5010 goto drop; 5011 5012 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 5013 goto drop; 5014 5015 if (status->rx_flags & IEEE80211_RX_AMSDU) { 5016 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 5017 RX_QUEUED) 5018 goto drop; 5019 5020 return true; 5021 } 5022 5023 /* do the header conversion - first grab the addresses */ 5024 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 5025 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 5026 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) { 5027 skb_pull(skb, snap_offs - 2); 5028 put_unaligned_be16(skb->len - 2, skb->data); 5029 } else { 5030 skb_postpull_rcsum(skb, skb->data + snap_offs, 5031 sizeof(rfc1042_header) + 2); 5032 5033 /* remove the SNAP but leave the ethertype */ 5034 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 5035 } 5036 /* push the addresses in front */ 5037 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 5038 5039 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb); 5040 switch (res) { 5041 case RX_QUEUED: 5042 stats->last_rx = jiffies; 5043 stats->last_rate = sta_stats_encode_rate(status); 5044 return true; 5045 case RX_CONTINUE: 5046 break; 5047 default: 5048 goto drop; 5049 } 5050 5051 ieee80211_rx_8023(rx, fast_rx, orig_len); 5052 5053 return true; 5054 drop: 5055 dev_kfree_skb(skb); 5056 5057 stats->dropped++; 5058 return true; 5059 } 5060 5061 /* 5062 * This function returns whether or not the SKB 5063 * was destined for RX processing or not, which, 5064 * if consume is true, is equivalent to whether 5065 * or not the skb was consumed. 5066 */ 5067 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 5068 struct sk_buff *skb, bool consume) 5069 { 5070 struct ieee80211_local *local = rx->local; 5071 struct ieee80211_sub_if_data *sdata = rx->sdata; 5072 struct ieee80211_hdr *hdr = (void *)skb->data; 5073 struct link_sta_info *link_sta = rx->link_sta; 5074 struct ieee80211_link_data *link = rx->link; 5075 5076 rx->skb = skb; 5077 5078 /* See if we can do fast-rx; if we have to copy we already lost, 5079 * so punt in that case. We should never have to deliver a data 5080 * frame to multiple interfaces anyway. 5081 * 5082 * We skip the ieee80211_accept_frame() call and do the necessary 5083 * checking inside ieee80211_invoke_fast_rx(). 5084 */ 5085 if (consume && rx->sta) { 5086 struct ieee80211_fast_rx *fast_rx; 5087 5088 fast_rx = rcu_dereference(rx->sta->fast_rx); 5089 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 5090 return true; 5091 } 5092 5093 if (!ieee80211_accept_frame(rx)) 5094 return false; 5095 5096 if (!consume) { 5097 struct skb_shared_hwtstamps *shwt; 5098 5099 rx->skb = skb_copy(skb, GFP_ATOMIC); 5100 if (!rx->skb) { 5101 if (net_ratelimit()) 5102 wiphy_debug(local->hw.wiphy, 5103 "failed to copy skb for %s\n", 5104 sdata->name); 5105 return true; 5106 } 5107 5108 /* skb_copy() does not copy the hw timestamps, so copy it 5109 * explicitly 5110 */ 5111 shwt = skb_hwtstamps(rx->skb); 5112 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 5113 5114 /* Update the hdr pointer to the new skb for translation below */ 5115 hdr = (struct ieee80211_hdr *)rx->skb->data; 5116 } 5117 5118 /* Store a copy of the pre-translated link addresses for SW crypto */ 5119 if (unlikely(is_unicast_ether_addr(hdr->addr1) && 5120 !ieee80211_is_data(hdr->frame_control))) 5121 memcpy(rx->link_addrs, &hdr->addrs, 3 * ETH_ALEN); 5122 5123 if (unlikely(rx->sta && rx->sta->sta.mlo) && 5124 is_unicast_ether_addr(hdr->addr1) && 5125 !ieee80211_is_probe_resp(hdr->frame_control) && 5126 !ieee80211_is_beacon(hdr->frame_control)) { 5127 /* translate to MLD addresses */ 5128 if (ether_addr_equal(link->conf->addr, hdr->addr1)) 5129 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr); 5130 if (ether_addr_equal(link_sta->addr, hdr->addr2)) 5131 ether_addr_copy(hdr->addr2, rx->sta->addr); 5132 /* translate A3 only if it's the BSSID */ 5133 if (!ieee80211_has_tods(hdr->frame_control) && 5134 !ieee80211_has_fromds(hdr->frame_control)) { 5135 if (ether_addr_equal(link_sta->addr, hdr->addr3)) 5136 ether_addr_copy(hdr->addr3, rx->sta->addr); 5137 else if (ether_addr_equal(link->conf->addr, hdr->addr3)) 5138 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr); 5139 } 5140 /* not needed for A4 since it can only carry the SA */ 5141 } 5142 5143 ieee80211_invoke_rx_handlers(rx); 5144 return true; 5145 } 5146 5147 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, 5148 struct ieee80211_sta *pubsta, 5149 struct sk_buff *skb, 5150 struct list_head *list) 5151 { 5152 struct ieee80211_local *local = hw_to_local(hw); 5153 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5154 struct ieee80211_fast_rx *fast_rx; 5155 struct ieee80211_rx_data rx; 5156 struct sta_info *sta; 5157 int link_id = -1; 5158 5159 memset(&rx, 0, sizeof(rx)); 5160 rx.skb = skb; 5161 rx.local = local; 5162 rx.list = list; 5163 rx.link_id = -1; 5164 5165 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5166 5167 /* drop frame if too short for header */ 5168 if (skb->len < sizeof(struct ethhdr)) 5169 goto drop; 5170 5171 if (!pubsta) 5172 goto drop; 5173 5174 if (status->link_valid) 5175 link_id = status->link_id; 5176 5177 /* 5178 * TODO: Should the frame be dropped if the right link_id is not 5179 * available? Or may be it is fine in the current form to proceed with 5180 * the frame processing because with frame being in 802.3 format, 5181 * link_id is used only for stats purpose and updating the stats on 5182 * the deflink is fine? 5183 */ 5184 sta = container_of(pubsta, struct sta_info, sta); 5185 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5186 goto drop; 5187 5188 fast_rx = rcu_dereference(rx.sta->fast_rx); 5189 if (!fast_rx) 5190 goto drop; 5191 5192 ieee80211_rx_8023(&rx, fast_rx, skb->len); 5193 return; 5194 5195 drop: 5196 dev_kfree_skb(skb); 5197 } 5198 5199 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx, 5200 struct sk_buff *skb, bool consume) 5201 { 5202 struct link_sta_info *link_sta; 5203 struct ieee80211_hdr *hdr = (void *)skb->data; 5204 struct sta_info *sta; 5205 int link_id = -1; 5206 5207 /* 5208 * Look up link station first, in case there's a 5209 * chance that they might have a link address that 5210 * is identical to the MLD address, that way we'll 5211 * have the link information if needed. 5212 */ 5213 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2); 5214 if (link_sta) { 5215 sta = link_sta->sta; 5216 link_id = link_sta->link_id; 5217 } else { 5218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5219 5220 sta = sta_info_get_bss(rx->sdata, hdr->addr2); 5221 if (status->link_valid) { 5222 link_id = status->link_id; 5223 } else if (ieee80211_vif_is_mld(&rx->sdata->vif) && 5224 status->freq) { 5225 struct ieee80211_link_data *link; 5226 struct ieee80211_chanctx_conf *conf; 5227 5228 for_each_link_data_rcu(rx->sdata, link) { 5229 conf = rcu_dereference(link->conf->chanctx_conf); 5230 if (!conf || !conf->def.chan) 5231 continue; 5232 5233 if (status->freq == conf->def.chan->center_freq) { 5234 link_id = link->link_id; 5235 break; 5236 } 5237 } 5238 } 5239 } 5240 5241 if (!ieee80211_rx_data_set_sta(rx, sta, link_id)) 5242 return false; 5243 5244 return ieee80211_prepare_and_rx_handle(rx, skb, consume); 5245 } 5246 5247 /* 5248 * This is the actual Rx frames handler. as it belongs to Rx path it must 5249 * be called with rcu_read_lock protection. 5250 */ 5251 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 5252 struct ieee80211_sta *pubsta, 5253 struct sk_buff *skb, 5254 struct list_head *list) 5255 { 5256 struct ieee80211_local *local = hw_to_local(hw); 5257 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5258 struct ieee80211_sub_if_data *sdata; 5259 struct ieee80211_hdr *hdr; 5260 __le16 fc; 5261 struct ieee80211_rx_data rx; 5262 struct ieee80211_sub_if_data *prev; 5263 struct rhlist_head *tmp; 5264 int err = 0; 5265 5266 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 5267 memset(&rx, 0, sizeof(rx)); 5268 rx.skb = skb; 5269 rx.local = local; 5270 rx.list = list; 5271 rx.link_id = -1; 5272 5273 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 5274 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 5275 5276 if (ieee80211_is_mgmt(fc)) { 5277 /* drop frame if too short for header */ 5278 if (skb->len < ieee80211_hdrlen(fc)) 5279 err = -ENOBUFS; 5280 else 5281 err = skb_linearize(skb); 5282 } else { 5283 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 5284 } 5285 5286 if (err) { 5287 dev_kfree_skb(skb); 5288 return; 5289 } 5290 5291 hdr = (struct ieee80211_hdr *)skb->data; 5292 ieee80211_parse_qos(&rx); 5293 ieee80211_verify_alignment(&rx); 5294 5295 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 5296 ieee80211_is_beacon(hdr->frame_control) || 5297 ieee80211_is_s1g_beacon(hdr->frame_control))) 5298 ieee80211_scan_rx(local, skb); 5299 5300 if (ieee80211_is_data(fc)) { 5301 struct sta_info *sta, *prev_sta; 5302 int link_id = -1; 5303 5304 if (status->link_valid) 5305 link_id = status->link_id; 5306 5307 if (pubsta) { 5308 sta = container_of(pubsta, struct sta_info, sta); 5309 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id)) 5310 goto out; 5311 5312 /* 5313 * In MLO connection, fetch the link_id using addr2 5314 * when the driver does not pass link_id in status. 5315 * When the address translation is already performed by 5316 * driver/hw, the valid link_id must be passed in 5317 * status. 5318 */ 5319 5320 if (!status->link_valid && pubsta->mlo) { 5321 struct link_sta_info *link_sta; 5322 5323 link_sta = link_sta_info_get_bss(rx.sdata, 5324 hdr->addr2); 5325 if (!link_sta) 5326 goto out; 5327 5328 ieee80211_rx_data_set_link(&rx, link_sta->link_id); 5329 } 5330 5331 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5332 return; 5333 goto out; 5334 } 5335 5336 prev_sta = NULL; 5337 5338 for_each_sta_info(local, hdr->addr2, sta, tmp) { 5339 if (!prev_sta) { 5340 prev_sta = sta; 5341 continue; 5342 } 5343 5344 rx.sdata = prev_sta->sdata; 5345 if (!status->link_valid && prev_sta->sta.mlo) { 5346 struct link_sta_info *link_sta; 5347 5348 link_sta = link_sta_info_get_bss(rx.sdata, 5349 hdr->addr2); 5350 if (!link_sta) 5351 continue; 5352 5353 link_id = link_sta->link_id; 5354 } 5355 5356 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5357 goto out; 5358 5359 ieee80211_prepare_and_rx_handle(&rx, skb, false); 5360 5361 prev_sta = sta; 5362 } 5363 5364 if (prev_sta) { 5365 rx.sdata = prev_sta->sdata; 5366 if (!status->link_valid && prev_sta->sta.mlo) { 5367 struct link_sta_info *link_sta; 5368 5369 link_sta = link_sta_info_get_bss(rx.sdata, 5370 hdr->addr2); 5371 if (!link_sta) 5372 goto out; 5373 5374 link_id = link_sta->link_id; 5375 } 5376 5377 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id)) 5378 goto out; 5379 5380 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 5381 return; 5382 goto out; 5383 } 5384 } 5385 5386 prev = NULL; 5387 5388 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 5389 if (!ieee80211_sdata_running(sdata)) 5390 continue; 5391 5392 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 5393 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 5394 continue; 5395 5396 /* 5397 * frame is destined for this interface, but if it's 5398 * not also for the previous one we handle that after 5399 * the loop to avoid copying the SKB once too much 5400 */ 5401 5402 if (!prev) { 5403 prev = sdata; 5404 continue; 5405 } 5406 5407 rx.sdata = prev; 5408 ieee80211_rx_for_interface(&rx, skb, false); 5409 5410 prev = sdata; 5411 } 5412 5413 if (prev) { 5414 rx.sdata = prev; 5415 5416 if (ieee80211_rx_for_interface(&rx, skb, true)) 5417 return; 5418 } 5419 5420 out: 5421 dev_kfree_skb(skb); 5422 } 5423 5424 /* 5425 * This is the receive path handler. It is called by a low level driver when an 5426 * 802.11 MPDU is received from the hardware. 5427 */ 5428 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5429 struct sk_buff *skb, struct list_head *list) 5430 { 5431 struct ieee80211_local *local = hw_to_local(hw); 5432 struct ieee80211_rate *rate = NULL; 5433 struct ieee80211_supported_band *sband; 5434 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 5435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 5436 5437 WARN_ON_ONCE(softirq_count() == 0); 5438 5439 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 5440 goto drop; 5441 5442 sband = local->hw.wiphy->bands[status->band]; 5443 if (WARN_ON(!sband)) 5444 goto drop; 5445 5446 /* 5447 * If we're suspending, it is possible although not too likely 5448 * that we'd be receiving frames after having already partially 5449 * quiesced the stack. We can't process such frames then since 5450 * that might, for example, cause stations to be added or other 5451 * driver callbacks be invoked. 5452 */ 5453 if (unlikely(local->quiescing || local->suspended)) 5454 goto drop; 5455 5456 /* We might be during a HW reconfig, prevent Rx for the same reason */ 5457 if (unlikely(local->in_reconfig)) 5458 goto drop; 5459 5460 /* 5461 * The same happens when we're not even started, 5462 * but that's worth a warning. 5463 */ 5464 if (WARN_ON(!local->started)) 5465 goto drop; 5466 5467 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC) && 5468 !(status->flag & RX_FLAG_NO_PSDU && 5469 status->zero_length_psdu_type == 5470 IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED))) { 5471 /* 5472 * Validate the rate, unless there was a PLCP error which may 5473 * have an invalid rate or the PSDU was not capture and may be 5474 * missing rate information. 5475 */ 5476 5477 switch (status->encoding) { 5478 case RX_ENC_HT: 5479 /* 5480 * rate_idx is MCS index, which can be [0-76] 5481 * as documented on: 5482 * 5483 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n 5484 * 5485 * Anything else would be some sort of driver or 5486 * hardware error. The driver should catch hardware 5487 * errors. 5488 */ 5489 if (WARN(status->rate_idx > 76, 5490 "Rate marked as an HT rate but passed " 5491 "status->rate_idx is not " 5492 "an MCS index [0-76]: %d (0x%02x)\n", 5493 status->rate_idx, 5494 status->rate_idx)) 5495 goto drop; 5496 break; 5497 case RX_ENC_VHT: 5498 if (WARN_ONCE(status->rate_idx > 11 || 5499 !status->nss || 5500 status->nss > 8, 5501 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 5502 status->rate_idx, status->nss)) 5503 goto drop; 5504 break; 5505 case RX_ENC_HE: 5506 if (WARN_ONCE(status->rate_idx > 11 || 5507 !status->nss || 5508 status->nss > 8, 5509 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 5510 status->rate_idx, status->nss)) 5511 goto drop; 5512 break; 5513 case RX_ENC_EHT: 5514 if (WARN_ONCE(status->rate_idx > 15 || 5515 !status->nss || 5516 status->nss > 8 || 5517 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5518 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5519 status->rate_idx, status->nss, status->eht.gi)) 5520 goto drop; 5521 break; 5522 case RX_ENC_UHR: 5523 if (WARN_ONCE(!(status->rate_idx <= 15 || 5524 status->rate_idx == 17 || 5525 status->rate_idx == 19 || 5526 status->rate_idx == 20 || 5527 status->rate_idx == 23) || 5528 !status->nss || 5529 status->nss > 8 || 5530 status->uhr.gi > NL80211_RATE_INFO_EHT_GI_3_2, 5531 "Rate marked as a UHR rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n", 5532 status->rate_idx, status->nss, status->uhr.gi)) 5533 goto drop; 5534 if (WARN_ONCE(status->uhr.elr && 5535 (status->nss != 1 || status->rate_idx > 1 || 5536 status->uhr.gi != NL80211_RATE_INFO_EHT_GI_1_6 || 5537 status->bw != RATE_INFO_BW_20 || status->uhr.im), 5538 "bad UHR ELR MCS MCS:%d, NSS:%d, GI:%d, BW:%d, IM:%d\n", 5539 status->rate_idx, status->nss, status->uhr.gi, 5540 status->bw, status->uhr.im)) 5541 goto drop; 5542 if (WARN_ONCE(status->uhr.im && 5543 (status->nss != 1 || status->rate_idx == 15), 5544 "bad UHR IM MCS MCS:%d, NSS:%d\n", 5545 status->rate_idx, status->nss)) 5546 goto drop; 5547 break; 5548 default: 5549 WARN_ON_ONCE(1); 5550 fallthrough; 5551 case RX_ENC_LEGACY: 5552 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 5553 goto drop; 5554 rate = &sband->bitrates[status->rate_idx]; 5555 } 5556 } 5557 5558 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED)) 5559 goto drop; 5560 5561 status->rx_flags = 0; 5562 5563 kcov_remote_start_common(skb_get_kcov_handle(skb)); 5564 5565 /* 5566 * Frames with failed FCS/PLCP checksum are not returned, 5567 * all other frames are returned without radiotap header 5568 * if it was previously present. 5569 * Also, frames with less than 16 bytes are dropped. 5570 */ 5571 if (!(status->flag & RX_FLAG_8023)) 5572 skb = ieee80211_rx_monitor(local, skb, rate); 5573 if (skb) { 5574 if ((status->flag & RX_FLAG_8023) || 5575 ieee80211_is_data_present(hdr->frame_control)) 5576 ieee80211_tpt_led_trig_rx(local, skb->len); 5577 5578 if (status->flag & RX_FLAG_8023) 5579 __ieee80211_rx_handle_8023(hw, pubsta, skb, list); 5580 else 5581 __ieee80211_rx_handle_packet(hw, pubsta, skb, list); 5582 } 5583 5584 kcov_remote_stop(); 5585 return; 5586 drop: 5587 kfree_skb(skb); 5588 } 5589 EXPORT_SYMBOL(ieee80211_rx_list); 5590 5591 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 5592 struct sk_buff *skb, struct napi_struct *napi) 5593 { 5594 struct sk_buff *tmp; 5595 LIST_HEAD(list); 5596 5597 5598 /* 5599 * key references and virtual interfaces are protected using RCU 5600 * and this requires that we are in a read-side RCU section during 5601 * receive processing 5602 */ 5603 rcu_read_lock(); 5604 ieee80211_rx_list(hw, pubsta, skb, &list); 5605 rcu_read_unlock(); 5606 5607 if (!napi) { 5608 netif_receive_skb_list(&list); 5609 return; 5610 } 5611 5612 list_for_each_entry_safe(skb, tmp, &list, list) { 5613 skb_list_del_init(skb); 5614 napi_gro_receive(napi, skb); 5615 } 5616 } 5617 EXPORT_SYMBOL(ieee80211_rx_napi); 5618 5619 /* This is a version of the rx handler that can be called from hard irq 5620 * context. Post the skb on the queue and schedule the tasklet */ 5621 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 5622 { 5623 struct ieee80211_local *local = hw_to_local(hw); 5624 5625 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 5626 5627 skb->pkt_type = IEEE80211_RX_MSG; 5628 skb_queue_tail(&local->skb_queue, skb); 5629 tasklet_schedule(&local->tasklet); 5630 } 5631 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 5632