1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH 8 * Copyright (C) 2018 Intel Corporation 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/jiffies.h> 16 #include <linux/slab.h> 17 #include <linux/kernel.h> 18 #include <linux/skbuff.h> 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <linux/bitops.h> 24 #include <net/mac80211.h> 25 #include <net/ieee80211_radiotap.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "led.h" 31 #include "mesh.h" 32 #include "wep.h" 33 #include "wpa.h" 34 #include "tkip.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len) 39 { 40 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 41 42 u64_stats_update_begin(&tstats->syncp); 43 tstats->rx_packets++; 44 tstats->rx_bytes += len; 45 u64_stats_update_end(&tstats->syncp); 46 } 47 48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, 49 enum nl80211_iftype type) 50 { 51 __le16 fc = hdr->frame_control; 52 53 if (ieee80211_is_data(fc)) { 54 if (len < 24) /* drop incorrect hdr len (data) */ 55 return NULL; 56 57 if (ieee80211_has_a4(fc)) 58 return NULL; 59 if (ieee80211_has_tods(fc)) 60 return hdr->addr1; 61 if (ieee80211_has_fromds(fc)) 62 return hdr->addr2; 63 64 return hdr->addr3; 65 } 66 67 if (ieee80211_is_mgmt(fc)) { 68 if (len < 24) /* drop incorrect hdr len (mgmt) */ 69 return NULL; 70 return hdr->addr3; 71 } 72 73 if (ieee80211_is_ctl(fc)) { 74 if (ieee80211_is_pspoll(fc)) 75 return hdr->addr1; 76 77 if (ieee80211_is_back_req(fc)) { 78 switch (type) { 79 case NL80211_IFTYPE_STATION: 80 return hdr->addr2; 81 case NL80211_IFTYPE_AP: 82 case NL80211_IFTYPE_AP_VLAN: 83 return hdr->addr1; 84 default: 85 break; /* fall through to the return */ 86 } 87 } 88 } 89 90 return NULL; 91 } 92 93 /* 94 * monitor mode reception 95 * 96 * This function cleans up the SKB, i.e. it removes all the stuff 97 * only useful for monitoring. 98 */ 99 static void remove_monitor_info(struct sk_buff *skb, 100 unsigned int present_fcs_len, 101 unsigned int rtap_space) 102 { 103 if (present_fcs_len) 104 __pskb_trim(skb, skb->len - present_fcs_len); 105 __pskb_pull(skb, rtap_space); 106 } 107 108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len, 109 unsigned int rtap_space) 110 { 111 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 112 struct ieee80211_hdr *hdr; 113 114 hdr = (void *)(skb->data + rtap_space); 115 116 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 117 RX_FLAG_FAILED_PLCP_CRC | 118 RX_FLAG_ONLY_MONITOR | 119 RX_FLAG_NO_PSDU)) 120 return true; 121 122 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space)) 123 return true; 124 125 if (ieee80211_is_ctl(hdr->frame_control) && 126 !ieee80211_is_pspoll(hdr->frame_control) && 127 !ieee80211_is_back_req(hdr->frame_control)) 128 return true; 129 130 return false; 131 } 132 133 static int 134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, 135 struct ieee80211_rx_status *status, 136 struct sk_buff *skb) 137 { 138 int len; 139 140 /* always present fields */ 141 len = sizeof(struct ieee80211_radiotap_header) + 8; 142 143 /* allocate extra bitmaps */ 144 if (status->chains) 145 len += 4 * hweight8(status->chains); 146 /* vendor presence bitmap */ 147 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) 148 len += 4; 149 150 if (ieee80211_have_rx_timestamp(status)) { 151 len = ALIGN(len, 8); 152 len += 8; 153 } 154 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 155 len += 1; 156 157 /* antenna field, if we don't have per-chain info */ 158 if (!status->chains) 159 len += 1; 160 161 /* padding for RX_FLAGS if necessary */ 162 len = ALIGN(len, 2); 163 164 if (status->encoding == RX_ENC_HT) /* HT info */ 165 len += 3; 166 167 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 168 len = ALIGN(len, 4); 169 len += 8; 170 } 171 172 if (status->encoding == RX_ENC_VHT) { 173 len = ALIGN(len, 2); 174 len += 12; 175 } 176 177 if (local->hw.radiotap_timestamp.units_pos >= 0) { 178 len = ALIGN(len, 8); 179 len += 12; 180 } 181 182 if (status->encoding == RX_ENC_HE && 183 status->flag & RX_FLAG_RADIOTAP_HE) { 184 len = ALIGN(len, 2); 185 len += 12; 186 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12); 187 } 188 189 if (status->encoding == RX_ENC_HE && 190 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 191 len = ALIGN(len, 2); 192 len += 12; 193 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12); 194 } 195 196 if (status->flag & RX_FLAG_NO_PSDU) 197 len += 1; 198 199 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 200 len = ALIGN(len, 2); 201 len += 4; 202 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4); 203 } 204 205 if (status->chains) { 206 /* antenna and antenna signal fields */ 207 len += 2 * hweight8(status->chains); 208 } 209 210 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 211 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data; 212 213 /* alignment for fixed 6-byte vendor data header */ 214 len = ALIGN(len, 2); 215 /* vendor data header */ 216 len += 6; 217 if (WARN_ON(rtap->align == 0)) 218 rtap->align = 1; 219 len = ALIGN(len, rtap->align); 220 len += rtap->len + rtap->pad; 221 } 222 223 return len; 224 } 225 226 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, 227 struct sk_buff *skb, 228 int rtap_space) 229 { 230 struct { 231 struct ieee80211_hdr_3addr hdr; 232 u8 category; 233 u8 action_code; 234 } __packed __aligned(2) action; 235 236 if (!sdata) 237 return; 238 239 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1); 240 241 if (skb->len < rtap_space + sizeof(action) + 242 VHT_MUMIMO_GROUPS_DATA_LEN) 243 return; 244 245 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) 246 return; 247 248 skb_copy_bits(skb, rtap_space, &action, sizeof(action)); 249 250 if (!ieee80211_is_action(action.hdr.frame_control)) 251 return; 252 253 if (action.category != WLAN_CATEGORY_VHT) 254 return; 255 256 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) 257 return; 258 259 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) 260 return; 261 262 skb = skb_copy(skb, GFP_ATOMIC); 263 if (!skb) 264 return; 265 266 skb_queue_tail(&sdata->skb_queue, skb); 267 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 268 } 269 270 /* 271 * ieee80211_add_rx_radiotap_header - add radiotap header 272 * 273 * add a radiotap header containing all the fields which the hardware provided. 274 */ 275 static void 276 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 277 struct sk_buff *skb, 278 struct ieee80211_rate *rate, 279 int rtap_len, bool has_fcs) 280 { 281 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 282 struct ieee80211_radiotap_header *rthdr; 283 unsigned char *pos; 284 __le32 *it_present; 285 u32 it_present_val; 286 u16 rx_flags = 0; 287 u16 channel_flags = 0; 288 int mpdulen, chain; 289 unsigned long chains = status->chains; 290 struct ieee80211_vendor_radiotap rtap = {}; 291 struct ieee80211_radiotap_he he = {}; 292 struct ieee80211_radiotap_he_mu he_mu = {}; 293 struct ieee80211_radiotap_lsig lsig = {}; 294 295 if (status->flag & RX_FLAG_RADIOTAP_HE) { 296 he = *(struct ieee80211_radiotap_he *)skb->data; 297 skb_pull(skb, sizeof(he)); 298 WARN_ON_ONCE(status->encoding != RX_ENC_HE); 299 } 300 301 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { 302 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; 303 skb_pull(skb, sizeof(he_mu)); 304 } 305 306 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 307 lsig = *(struct ieee80211_radiotap_lsig *)skb->data; 308 skb_pull(skb, sizeof(lsig)); 309 } 310 311 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 312 rtap = *(struct ieee80211_vendor_radiotap *)skb->data; 313 /* rtap.len and rtap.pad are undone immediately */ 314 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad); 315 } 316 317 mpdulen = skb->len; 318 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 319 mpdulen += FCS_LEN; 320 321 rthdr = skb_push(skb, rtap_len); 322 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad); 323 it_present = &rthdr->it_present; 324 325 /* radiotap header, set always present flags */ 326 rthdr->it_len = cpu_to_le16(rtap_len); 327 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 328 BIT(IEEE80211_RADIOTAP_CHANNEL) | 329 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 330 331 if (!status->chains) 332 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 333 334 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 335 it_present_val |= 336 BIT(IEEE80211_RADIOTAP_EXT) | 337 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 338 put_unaligned_le32(it_present_val, it_present); 339 it_present++; 340 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 341 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 342 } 343 344 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 345 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | 346 BIT(IEEE80211_RADIOTAP_EXT); 347 put_unaligned_le32(it_present_val, it_present); 348 it_present++; 349 it_present_val = rtap.present; 350 } 351 352 put_unaligned_le32(it_present_val, it_present); 353 354 pos = (void *)(it_present + 1); 355 356 /* the order of the following fields is important */ 357 358 /* IEEE80211_RADIOTAP_TSFT */ 359 if (ieee80211_have_rx_timestamp(status)) { 360 /* padding */ 361 while ((pos - (u8 *)rthdr) & 7) 362 *pos++ = 0; 363 put_unaligned_le64( 364 ieee80211_calculate_rx_timestamp(local, status, 365 mpdulen, 0), 366 pos); 367 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 368 pos += 8; 369 } 370 371 /* IEEE80211_RADIOTAP_FLAGS */ 372 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 373 *pos |= IEEE80211_RADIOTAP_F_FCS; 374 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 375 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 376 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) 377 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 378 pos++; 379 380 /* IEEE80211_RADIOTAP_RATE */ 381 if (!rate || status->encoding != RX_ENC_LEGACY) { 382 /* 383 * Without rate information don't add it. If we have, 384 * MCS information is a separate field in radiotap, 385 * added below. The byte here is needed as padding 386 * for the channel though, so initialise it to 0. 387 */ 388 *pos = 0; 389 } else { 390 int shift = 0; 391 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 392 if (status->bw == RATE_INFO_BW_10) 393 shift = 1; 394 else if (status->bw == RATE_INFO_BW_5) 395 shift = 2; 396 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 397 } 398 pos++; 399 400 /* IEEE80211_RADIOTAP_CHANNEL */ 401 put_unaligned_le16(status->freq, pos); 402 pos += 2; 403 if (status->bw == RATE_INFO_BW_10) 404 channel_flags |= IEEE80211_CHAN_HALF; 405 else if (status->bw == RATE_INFO_BW_5) 406 channel_flags |= IEEE80211_CHAN_QUARTER; 407 408 if (status->band == NL80211_BAND_5GHZ) 409 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 410 else if (status->encoding != RX_ENC_LEGACY) 411 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 412 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 413 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 414 else if (rate) 415 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 416 else 417 channel_flags |= IEEE80211_CHAN_2GHZ; 418 put_unaligned_le16(channel_flags, pos); 419 pos += 2; 420 421 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 422 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 423 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 424 *pos = status->signal; 425 rthdr->it_present |= 426 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 427 pos++; 428 } 429 430 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 431 432 if (!status->chains) { 433 /* IEEE80211_RADIOTAP_ANTENNA */ 434 *pos = status->antenna; 435 pos++; 436 } 437 438 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 439 440 /* IEEE80211_RADIOTAP_RX_FLAGS */ 441 /* ensure 2 byte alignment for the 2 byte field as required */ 442 if ((pos - (u8 *)rthdr) & 1) 443 *pos++ = 0; 444 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 445 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 446 put_unaligned_le16(rx_flags, pos); 447 pos += 2; 448 449 if (status->encoding == RX_ENC_HT) { 450 unsigned int stbc; 451 452 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 453 *pos++ = local->hw.radiotap_mcs_details; 454 *pos = 0; 455 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 456 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 457 if (status->bw == RATE_INFO_BW_40) 458 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 459 if (status->enc_flags & RX_ENC_FLAG_HT_GF) 460 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 461 if (status->enc_flags & RX_ENC_FLAG_LDPC) 462 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 463 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; 464 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 465 pos++; 466 *pos++ = status->rate_idx; 467 } 468 469 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 470 u16 flags = 0; 471 472 /* ensure 4 byte alignment */ 473 while ((pos - (u8 *)rthdr) & 3) 474 pos++; 475 rthdr->it_present |= 476 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); 477 put_unaligned_le32(status->ampdu_reference, pos); 478 pos += 4; 479 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 480 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 481 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 482 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 483 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 484 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 485 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 486 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; 487 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) 488 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; 489 if (status->flag & RX_FLAG_AMPDU_EOF_BIT) 490 flags |= IEEE80211_RADIOTAP_AMPDU_EOF; 491 put_unaligned_le16(flags, pos); 492 pos += 2; 493 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 494 *pos++ = status->ampdu_delimiter_crc; 495 else 496 *pos++ = 0; 497 *pos++ = 0; 498 } 499 500 if (status->encoding == RX_ENC_VHT) { 501 u16 known = local->hw.radiotap_vht_details; 502 503 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 504 put_unaligned_le16(known, pos); 505 pos += 2; 506 /* flags */ 507 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) 508 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 509 /* in VHT, STBC is binary */ 510 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) 511 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 512 if (status->enc_flags & RX_ENC_FLAG_BF) 513 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 514 pos++; 515 /* bandwidth */ 516 switch (status->bw) { 517 case RATE_INFO_BW_80: 518 *pos++ = 4; 519 break; 520 case RATE_INFO_BW_160: 521 *pos++ = 11; 522 break; 523 case RATE_INFO_BW_40: 524 *pos++ = 1; 525 break; 526 default: 527 *pos++ = 0; 528 } 529 /* MCS/NSS */ 530 *pos = (status->rate_idx << 4) | status->nss; 531 pos += 4; 532 /* coding field */ 533 if (status->enc_flags & RX_ENC_FLAG_LDPC) 534 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 535 pos++; 536 /* group ID */ 537 pos++; 538 /* partial_aid */ 539 pos += 2; 540 } 541 542 if (local->hw.radiotap_timestamp.units_pos >= 0) { 543 u16 accuracy = 0; 544 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; 545 546 rthdr->it_present |= 547 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP); 548 549 /* ensure 8 byte alignment */ 550 while ((pos - (u8 *)rthdr) & 7) 551 pos++; 552 553 put_unaligned_le64(status->device_timestamp, pos); 554 pos += sizeof(u64); 555 556 if (local->hw.radiotap_timestamp.accuracy >= 0) { 557 accuracy = local->hw.radiotap_timestamp.accuracy; 558 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; 559 } 560 put_unaligned_le16(accuracy, pos); 561 pos += sizeof(u16); 562 563 *pos++ = local->hw.radiotap_timestamp.units_pos; 564 *pos++ = flags; 565 } 566 567 if (status->encoding == RX_ENC_HE && 568 status->flag & RX_FLAG_RADIOTAP_HE) { 569 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) 570 571 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { 572 he.data6 |= HE_PREP(DATA6_NSTS, 573 FIELD_GET(RX_ENC_FLAG_STBC_MASK, 574 status->enc_flags)); 575 he.data3 |= HE_PREP(DATA3_STBC, 1); 576 } else { 577 he.data6 |= HE_PREP(DATA6_NSTS, status->nss); 578 } 579 580 #define CHECK_GI(s) \ 581 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ 582 (int)NL80211_RATE_INFO_HE_GI_##s) 583 584 CHECK_GI(0_8); 585 CHECK_GI(1_6); 586 CHECK_GI(3_2); 587 588 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); 589 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); 590 he.data3 |= HE_PREP(DATA3_CODING, 591 !!(status->enc_flags & RX_ENC_FLAG_LDPC)); 592 593 he.data5 |= HE_PREP(DATA5_GI, status->he_gi); 594 595 switch (status->bw) { 596 case RATE_INFO_BW_20: 597 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 598 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); 599 break; 600 case RATE_INFO_BW_40: 601 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 602 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); 603 break; 604 case RATE_INFO_BW_80: 605 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 606 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); 607 break; 608 case RATE_INFO_BW_160: 609 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 610 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); 611 break; 612 case RATE_INFO_BW_HE_RU: 613 #define CHECK_RU_ALLOC(s) \ 614 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ 615 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) 616 617 CHECK_RU_ALLOC(26); 618 CHECK_RU_ALLOC(52); 619 CHECK_RU_ALLOC(106); 620 CHECK_RU_ALLOC(242); 621 CHECK_RU_ALLOC(484); 622 CHECK_RU_ALLOC(996); 623 CHECK_RU_ALLOC(2x996); 624 625 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, 626 status->he_ru + 4); 627 break; 628 default: 629 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); 630 } 631 632 /* ensure 2 byte alignment */ 633 while ((pos - (u8 *)rthdr) & 1) 634 pos++; 635 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE); 636 memcpy(pos, &he, sizeof(he)); 637 pos += sizeof(he); 638 } 639 640 if (status->encoding == RX_ENC_HE && 641 status->flag & RX_FLAG_RADIOTAP_HE_MU) { 642 /* ensure 2 byte alignment */ 643 while ((pos - (u8 *)rthdr) & 1) 644 pos++; 645 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU); 646 memcpy(pos, &he_mu, sizeof(he_mu)); 647 pos += sizeof(he_mu); 648 } 649 650 if (status->flag & RX_FLAG_NO_PSDU) { 651 rthdr->it_present |= 652 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU); 653 *pos++ = status->zero_length_psdu_type; 654 } 655 656 if (status->flag & RX_FLAG_RADIOTAP_LSIG) { 657 /* ensure 2 byte alignment */ 658 while ((pos - (u8 *)rthdr) & 1) 659 pos++; 660 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG); 661 memcpy(pos, &lsig, sizeof(lsig)); 662 pos += sizeof(lsig); 663 } 664 665 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 666 *pos++ = status->chain_signal[chain]; 667 *pos++ = chain; 668 } 669 670 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 671 /* ensure 2 byte alignment for the vendor field as required */ 672 if ((pos - (u8 *)rthdr) & 1) 673 *pos++ = 0; 674 *pos++ = rtap.oui[0]; 675 *pos++ = rtap.oui[1]; 676 *pos++ = rtap.oui[2]; 677 *pos++ = rtap.subns; 678 put_unaligned_le16(rtap.len, pos); 679 pos += 2; 680 /* align the actual payload as requested */ 681 while ((pos - (u8 *)rthdr) & (rtap.align - 1)) 682 *pos++ = 0; 683 /* data (and possible padding) already follows */ 684 } 685 } 686 687 static struct sk_buff * 688 ieee80211_make_monitor_skb(struct ieee80211_local *local, 689 struct sk_buff **origskb, 690 struct ieee80211_rate *rate, 691 int rtap_space, bool use_origskb) 692 { 693 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); 694 int rt_hdrlen, needed_headroom; 695 struct sk_buff *skb; 696 697 /* room for the radiotap header based on driver features */ 698 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); 699 needed_headroom = rt_hdrlen - rtap_space; 700 701 if (use_origskb) { 702 /* only need to expand headroom if necessary */ 703 skb = *origskb; 704 *origskb = NULL; 705 706 /* 707 * This shouldn't trigger often because most devices have an 708 * RX header they pull before we get here, and that should 709 * be big enough for our radiotap information. We should 710 * probably export the length to drivers so that we can have 711 * them allocate enough headroom to start with. 712 */ 713 if (skb_headroom(skb) < needed_headroom && 714 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 715 dev_kfree_skb(skb); 716 return NULL; 717 } 718 } else { 719 /* 720 * Need to make a copy and possibly remove radiotap header 721 * and FCS from the original. 722 */ 723 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC); 724 725 if (!skb) 726 return NULL; 727 } 728 729 /* prepend radiotap information */ 730 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 731 732 skb_reset_mac_header(skb); 733 skb->ip_summed = CHECKSUM_UNNECESSARY; 734 skb->pkt_type = PACKET_OTHERHOST; 735 skb->protocol = htons(ETH_P_802_2); 736 737 return skb; 738 } 739 740 /* 741 * This function copies a received frame to all monitor interfaces and 742 * returns a cleaned-up SKB that no longer includes the FCS nor the 743 * radiotap header the driver might have added. 744 */ 745 static struct sk_buff * 746 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 747 struct ieee80211_rate *rate) 748 { 749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 750 struct ieee80211_sub_if_data *sdata; 751 struct sk_buff *monskb = NULL; 752 int present_fcs_len = 0; 753 unsigned int rtap_space = 0; 754 struct ieee80211_sub_if_data *monitor_sdata = 755 rcu_dereference(local->monitor_sdata); 756 bool only_monitor = false; 757 unsigned int min_head_len; 758 759 if (status->flag & RX_FLAG_RADIOTAP_HE) 760 rtap_space += sizeof(struct ieee80211_radiotap_he); 761 762 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) 763 rtap_space += sizeof(struct ieee80211_radiotap_he_mu); 764 765 if (status->flag & RX_FLAG_RADIOTAP_LSIG) 766 rtap_space += sizeof(struct ieee80211_radiotap_lsig); 767 768 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) { 769 struct ieee80211_vendor_radiotap *rtap = 770 (void *)(origskb->data + rtap_space); 771 772 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad; 773 } 774 775 min_head_len = rtap_space; 776 777 /* 778 * First, we may need to make a copy of the skb because 779 * (1) we need to modify it for radiotap (if not present), and 780 * (2) the other RX handlers will modify the skb we got. 781 * 782 * We don't need to, of course, if we aren't going to return 783 * the SKB because it has a bad FCS/PLCP checksum. 784 */ 785 786 if (!(status->flag & RX_FLAG_NO_PSDU)) { 787 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 788 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { 789 /* driver bug */ 790 WARN_ON(1); 791 dev_kfree_skb(origskb); 792 return NULL; 793 } 794 present_fcs_len = FCS_LEN; 795 } 796 797 /* also consider the hdr->frame_control */ 798 min_head_len += 2; 799 } 800 801 /* ensure that the expected data elements are in skb head */ 802 if (!pskb_may_pull(origskb, min_head_len)) { 803 dev_kfree_skb(origskb); 804 return NULL; 805 } 806 807 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); 808 809 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { 810 if (only_monitor) { 811 dev_kfree_skb(origskb); 812 return NULL; 813 } 814 815 remove_monitor_info(origskb, present_fcs_len, rtap_space); 816 return origskb; 817 } 818 819 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); 820 821 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { 822 bool last_monitor = list_is_last(&sdata->u.mntr.list, 823 &local->mon_list); 824 825 if (!monskb) 826 monskb = ieee80211_make_monitor_skb(local, &origskb, 827 rate, rtap_space, 828 only_monitor && 829 last_monitor); 830 831 if (monskb) { 832 struct sk_buff *skb; 833 834 if (last_monitor) { 835 skb = monskb; 836 monskb = NULL; 837 } else { 838 skb = skb_clone(monskb, GFP_ATOMIC); 839 } 840 841 if (skb) { 842 skb->dev = sdata->dev; 843 ieee80211_rx_stats(skb->dev, skb->len); 844 netif_receive_skb(skb); 845 } 846 } 847 848 if (last_monitor) 849 break; 850 } 851 852 /* this happens if last_monitor was erroneously false */ 853 dev_kfree_skb(monskb); 854 855 /* ditto */ 856 if (!origskb) 857 return NULL; 858 859 remove_monitor_info(origskb, present_fcs_len, rtap_space); 860 return origskb; 861 } 862 863 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 864 { 865 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 866 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 867 int tid, seqno_idx, security_idx; 868 869 /* does the frame have a qos control field? */ 870 if (ieee80211_is_data_qos(hdr->frame_control)) { 871 u8 *qc = ieee80211_get_qos_ctl(hdr); 872 /* frame has qos control */ 873 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 874 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 875 status->rx_flags |= IEEE80211_RX_AMSDU; 876 877 seqno_idx = tid; 878 security_idx = tid; 879 } else { 880 /* 881 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 882 * 883 * Sequence numbers for management frames, QoS data 884 * frames with a broadcast/multicast address in the 885 * Address 1 field, and all non-QoS data frames sent 886 * by QoS STAs are assigned using an additional single 887 * modulo-4096 counter, [...] 888 * 889 * We also use that counter for non-QoS STAs. 890 */ 891 seqno_idx = IEEE80211_NUM_TIDS; 892 security_idx = 0; 893 if (ieee80211_is_mgmt(hdr->frame_control)) 894 security_idx = IEEE80211_NUM_TIDS; 895 tid = 0; 896 } 897 898 rx->seqno_idx = seqno_idx; 899 rx->security_idx = security_idx; 900 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 901 * For now, set skb->priority to 0 for other cases. */ 902 rx->skb->priority = (tid > 7) ? 0 : tid; 903 } 904 905 /** 906 * DOC: Packet alignment 907 * 908 * Drivers always need to pass packets that are aligned to two-byte boundaries 909 * to the stack. 910 * 911 * Additionally, should, if possible, align the payload data in a way that 912 * guarantees that the contained IP header is aligned to a four-byte 913 * boundary. In the case of regular frames, this simply means aligning the 914 * payload to a four-byte boundary (because either the IP header is directly 915 * contained, or IV/RFC1042 headers that have a length divisible by four are 916 * in front of it). If the payload data is not properly aligned and the 917 * architecture doesn't support efficient unaligned operations, mac80211 918 * will align the data. 919 * 920 * With A-MSDU frames, however, the payload data address must yield two modulo 921 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 922 * push the IP header further back to a multiple of four again. Thankfully, the 923 * specs were sane enough this time around to require padding each A-MSDU 924 * subframe to a length that is a multiple of four. 925 * 926 * Padding like Atheros hardware adds which is between the 802.11 header and 927 * the payload is not supported, the driver is required to move the 802.11 928 * header to be directly in front of the payload in that case. 929 */ 930 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 931 { 932 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 933 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 934 #endif 935 } 936 937 938 /* rx handlers */ 939 940 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 941 { 942 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 943 944 if (is_multicast_ether_addr(hdr->addr1)) 945 return 0; 946 947 return ieee80211_is_robust_mgmt_frame(skb); 948 } 949 950 951 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 952 { 953 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 954 955 if (!is_multicast_ether_addr(hdr->addr1)) 956 return 0; 957 958 return ieee80211_is_robust_mgmt_frame(skb); 959 } 960 961 962 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 963 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 964 { 965 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 966 struct ieee80211_mmie *mmie; 967 struct ieee80211_mmie_16 *mmie16; 968 969 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 970 return -1; 971 972 if (!ieee80211_is_robust_mgmt_frame(skb)) 973 return -1; /* not a robust management frame */ 974 975 mmie = (struct ieee80211_mmie *) 976 (skb->data + skb->len - sizeof(*mmie)); 977 if (mmie->element_id == WLAN_EID_MMIE && 978 mmie->length == sizeof(*mmie) - 2) 979 return le16_to_cpu(mmie->key_id); 980 981 mmie16 = (struct ieee80211_mmie_16 *) 982 (skb->data + skb->len - sizeof(*mmie16)); 983 if (skb->len >= 24 + sizeof(*mmie16) && 984 mmie16->element_id == WLAN_EID_MMIE && 985 mmie16->length == sizeof(*mmie16) - 2) 986 return le16_to_cpu(mmie16->key_id); 987 988 return -1; 989 } 990 991 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs, 992 struct sk_buff *skb) 993 { 994 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 995 __le16 fc; 996 int hdrlen; 997 u8 keyid; 998 999 fc = hdr->frame_control; 1000 hdrlen = ieee80211_hdrlen(fc); 1001 1002 if (skb->len < hdrlen + cs->hdr_len) 1003 return -EINVAL; 1004 1005 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1); 1006 keyid &= cs->key_idx_mask; 1007 keyid >>= cs->key_idx_shift; 1008 1009 return keyid; 1010 } 1011 1012 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 1013 { 1014 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1015 char *dev_addr = rx->sdata->vif.addr; 1016 1017 if (ieee80211_is_data(hdr->frame_control)) { 1018 if (is_multicast_ether_addr(hdr->addr1)) { 1019 if (ieee80211_has_tods(hdr->frame_control) || 1020 !ieee80211_has_fromds(hdr->frame_control)) 1021 return RX_DROP_MONITOR; 1022 if (ether_addr_equal(hdr->addr3, dev_addr)) 1023 return RX_DROP_MONITOR; 1024 } else { 1025 if (!ieee80211_has_a4(hdr->frame_control)) 1026 return RX_DROP_MONITOR; 1027 if (ether_addr_equal(hdr->addr4, dev_addr)) 1028 return RX_DROP_MONITOR; 1029 } 1030 } 1031 1032 /* If there is not an established peer link and this is not a peer link 1033 * establisment frame, beacon or probe, drop the frame. 1034 */ 1035 1036 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 1037 struct ieee80211_mgmt *mgmt; 1038 1039 if (!ieee80211_is_mgmt(hdr->frame_control)) 1040 return RX_DROP_MONITOR; 1041 1042 if (ieee80211_is_action(hdr->frame_control)) { 1043 u8 category; 1044 1045 /* make sure category field is present */ 1046 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 1047 return RX_DROP_MONITOR; 1048 1049 mgmt = (struct ieee80211_mgmt *)hdr; 1050 category = mgmt->u.action.category; 1051 if (category != WLAN_CATEGORY_MESH_ACTION && 1052 category != WLAN_CATEGORY_SELF_PROTECTED) 1053 return RX_DROP_MONITOR; 1054 return RX_CONTINUE; 1055 } 1056 1057 if (ieee80211_is_probe_req(hdr->frame_control) || 1058 ieee80211_is_probe_resp(hdr->frame_control) || 1059 ieee80211_is_beacon(hdr->frame_control) || 1060 ieee80211_is_auth(hdr->frame_control)) 1061 return RX_CONTINUE; 1062 1063 return RX_DROP_MONITOR; 1064 } 1065 1066 return RX_CONTINUE; 1067 } 1068 1069 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, 1070 int index) 1071 { 1072 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index]; 1073 struct sk_buff *tail = skb_peek_tail(frames); 1074 struct ieee80211_rx_status *status; 1075 1076 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) 1077 return true; 1078 1079 if (!tail) 1080 return false; 1081 1082 status = IEEE80211_SKB_RXCB(tail); 1083 if (status->flag & RX_FLAG_AMSDU_MORE) 1084 return false; 1085 1086 return true; 1087 } 1088 1089 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 1090 struct tid_ampdu_rx *tid_agg_rx, 1091 int index, 1092 struct sk_buff_head *frames) 1093 { 1094 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; 1095 struct sk_buff *skb; 1096 struct ieee80211_rx_status *status; 1097 1098 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1099 1100 if (skb_queue_empty(skb_list)) 1101 goto no_frame; 1102 1103 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1104 __skb_queue_purge(skb_list); 1105 goto no_frame; 1106 } 1107 1108 /* release frames from the reorder ring buffer */ 1109 tid_agg_rx->stored_mpdu_num--; 1110 while ((skb = __skb_dequeue(skb_list))) { 1111 status = IEEE80211_SKB_RXCB(skb); 1112 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 1113 __skb_queue_tail(frames, skb); 1114 } 1115 1116 no_frame: 1117 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 1118 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1119 } 1120 1121 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 1122 struct tid_ampdu_rx *tid_agg_rx, 1123 u16 head_seq_num, 1124 struct sk_buff_head *frames) 1125 { 1126 int index; 1127 1128 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1129 1130 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 1131 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1132 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1133 frames); 1134 } 1135 } 1136 1137 /* 1138 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 1139 * the skb was added to the buffer longer than this time ago, the earlier 1140 * frames that have not yet been received are assumed to be lost and the skb 1141 * can be released for processing. This may also release other skb's from the 1142 * reorder buffer if there are no additional gaps between the frames. 1143 * 1144 * Callers must hold tid_agg_rx->reorder_lock. 1145 */ 1146 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 1147 1148 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 1149 struct tid_ampdu_rx *tid_agg_rx, 1150 struct sk_buff_head *frames) 1151 { 1152 int index, i, j; 1153 1154 lockdep_assert_held(&tid_agg_rx->reorder_lock); 1155 1156 /* release the buffer until next missing frame */ 1157 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1158 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && 1159 tid_agg_rx->stored_mpdu_num) { 1160 /* 1161 * No buffers ready to be released, but check whether any 1162 * frames in the reorder buffer have timed out. 1163 */ 1164 int skipped = 1; 1165 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 1166 j = (j + 1) % tid_agg_rx->buf_size) { 1167 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { 1168 skipped++; 1169 continue; 1170 } 1171 if (skipped && 1172 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 1173 HT_RX_REORDER_BUF_TIMEOUT)) 1174 goto set_release_timer; 1175 1176 /* don't leave incomplete A-MSDUs around */ 1177 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 1178 i = (i + 1) % tid_agg_rx->buf_size) 1179 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]); 1180 1181 ht_dbg_ratelimited(sdata, 1182 "release an RX reorder frame due to timeout on earlier frames\n"); 1183 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 1184 frames); 1185 1186 /* 1187 * Increment the head seq# also for the skipped slots. 1188 */ 1189 tid_agg_rx->head_seq_num = 1190 (tid_agg_rx->head_seq_num + 1191 skipped) & IEEE80211_SN_MASK; 1192 skipped = 0; 1193 } 1194 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1195 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 1196 frames); 1197 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1198 } 1199 1200 if (tid_agg_rx->stored_mpdu_num) { 1201 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 1202 1203 for (; j != (index - 1) % tid_agg_rx->buf_size; 1204 j = (j + 1) % tid_agg_rx->buf_size) { 1205 if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) 1206 break; 1207 } 1208 1209 set_release_timer: 1210 1211 if (!tid_agg_rx->removed) 1212 mod_timer(&tid_agg_rx->reorder_timer, 1213 tid_agg_rx->reorder_time[j] + 1 + 1214 HT_RX_REORDER_BUF_TIMEOUT); 1215 } else { 1216 del_timer(&tid_agg_rx->reorder_timer); 1217 } 1218 } 1219 1220 /* 1221 * As this function belongs to the RX path it must be under 1222 * rcu_read_lock protection. It returns false if the frame 1223 * can be processed immediately, true if it was consumed. 1224 */ 1225 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 1226 struct tid_ampdu_rx *tid_agg_rx, 1227 struct sk_buff *skb, 1228 struct sk_buff_head *frames) 1229 { 1230 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1231 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1232 u16 sc = le16_to_cpu(hdr->seq_ctrl); 1233 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 1234 u16 head_seq_num, buf_size; 1235 int index; 1236 bool ret = true; 1237 1238 spin_lock(&tid_agg_rx->reorder_lock); 1239 1240 /* 1241 * Offloaded BA sessions have no known starting sequence number so pick 1242 * one from first Rxed frame for this tid after BA was started. 1243 */ 1244 if (unlikely(tid_agg_rx->auto_seq)) { 1245 tid_agg_rx->auto_seq = false; 1246 tid_agg_rx->ssn = mpdu_seq_num; 1247 tid_agg_rx->head_seq_num = mpdu_seq_num; 1248 } 1249 1250 buf_size = tid_agg_rx->buf_size; 1251 head_seq_num = tid_agg_rx->head_seq_num; 1252 1253 /* 1254 * If the current MPDU's SN is smaller than the SSN, it shouldn't 1255 * be reordered. 1256 */ 1257 if (unlikely(!tid_agg_rx->started)) { 1258 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1259 ret = false; 1260 goto out; 1261 } 1262 tid_agg_rx->started = true; 1263 } 1264 1265 /* frame with out of date sequence number */ 1266 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 1267 dev_kfree_skb(skb); 1268 goto out; 1269 } 1270 1271 /* 1272 * If frame the sequence number exceeds our buffering window 1273 * size release some previous frames to make room for this one. 1274 */ 1275 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 1276 head_seq_num = ieee80211_sn_inc( 1277 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 1278 /* release stored frames up to new head to stack */ 1279 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 1280 head_seq_num, frames); 1281 } 1282 1283 /* Now the new frame is always in the range of the reordering buffer */ 1284 1285 index = mpdu_seq_num % tid_agg_rx->buf_size; 1286 1287 /* check if we already stored this frame */ 1288 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { 1289 dev_kfree_skb(skb); 1290 goto out; 1291 } 1292 1293 /* 1294 * If the current MPDU is in the right order and nothing else 1295 * is stored we can process it directly, no need to buffer it. 1296 * If it is first but there's something stored, we may be able 1297 * to release frames after this one. 1298 */ 1299 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1300 tid_agg_rx->stored_mpdu_num == 0) { 1301 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1302 tid_agg_rx->head_seq_num = 1303 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1304 ret = false; 1305 goto out; 1306 } 1307 1308 /* put the frame in the reordering buffer */ 1309 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); 1310 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1311 tid_agg_rx->reorder_time[index] = jiffies; 1312 tid_agg_rx->stored_mpdu_num++; 1313 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1314 } 1315 1316 out: 1317 spin_unlock(&tid_agg_rx->reorder_lock); 1318 return ret; 1319 } 1320 1321 /* 1322 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1323 * true if the MPDU was buffered, false if it should be processed. 1324 */ 1325 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1326 struct sk_buff_head *frames) 1327 { 1328 struct sk_buff *skb = rx->skb; 1329 struct ieee80211_local *local = rx->local; 1330 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1331 struct sta_info *sta = rx->sta; 1332 struct tid_ampdu_rx *tid_agg_rx; 1333 u16 sc; 1334 u8 tid, ack_policy; 1335 1336 if (!ieee80211_is_data_qos(hdr->frame_control) || 1337 is_multicast_ether_addr(hdr->addr1)) 1338 goto dont_reorder; 1339 1340 /* 1341 * filter the QoS data rx stream according to 1342 * STA/TID and check if this STA/TID is on aggregation 1343 */ 1344 1345 if (!sta) 1346 goto dont_reorder; 1347 1348 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1349 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1350 tid = ieee80211_get_tid(hdr); 1351 1352 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1353 if (!tid_agg_rx) { 1354 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1355 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 1356 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 1357 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 1358 WLAN_BACK_RECIPIENT, 1359 WLAN_REASON_QSTA_REQUIRE_SETUP); 1360 goto dont_reorder; 1361 } 1362 1363 /* qos null data frames are excluded */ 1364 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1365 goto dont_reorder; 1366 1367 /* not part of a BA session */ 1368 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1369 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) 1370 goto dont_reorder; 1371 1372 /* new, potentially un-ordered, ampdu frame - process it */ 1373 1374 /* reset session timer */ 1375 if (tid_agg_rx->timeout) 1376 tid_agg_rx->last_rx = jiffies; 1377 1378 /* if this mpdu is fragmented - terminate rx aggregation session */ 1379 sc = le16_to_cpu(hdr->seq_ctrl); 1380 if (sc & IEEE80211_SCTL_FRAG) { 1381 skb_queue_tail(&rx->sdata->skb_queue, skb); 1382 ieee80211_queue_work(&local->hw, &rx->sdata->work); 1383 return; 1384 } 1385 1386 /* 1387 * No locking needed -- we will only ever process one 1388 * RX packet at a time, and thus own tid_agg_rx. All 1389 * other code manipulating it needs to (and does) make 1390 * sure that we cannot get to it any more before doing 1391 * anything with it. 1392 */ 1393 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1394 frames)) 1395 return; 1396 1397 dont_reorder: 1398 __skb_queue_tail(frames, skb); 1399 } 1400 1401 static ieee80211_rx_result debug_noinline 1402 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1403 { 1404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1405 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1406 1407 if (status->flag & RX_FLAG_DUP_VALIDATED) 1408 return RX_CONTINUE; 1409 1410 /* 1411 * Drop duplicate 802.11 retransmissions 1412 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1413 */ 1414 1415 if (rx->skb->len < 24) 1416 return RX_CONTINUE; 1417 1418 if (ieee80211_is_ctl(hdr->frame_control) || 1419 ieee80211_is_nullfunc(hdr->frame_control) || 1420 ieee80211_is_qos_nullfunc(hdr->frame_control) || 1421 is_multicast_ether_addr(hdr->addr1)) 1422 return RX_CONTINUE; 1423 1424 if (!rx->sta) 1425 return RX_CONTINUE; 1426 1427 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1428 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1429 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1430 rx->sta->rx_stats.num_duplicates++; 1431 return RX_DROP_UNUSABLE; 1432 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1433 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1434 } 1435 1436 return RX_CONTINUE; 1437 } 1438 1439 static ieee80211_rx_result debug_noinline 1440 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1441 { 1442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1443 1444 /* Drop disallowed frame classes based on STA auth/assoc state; 1445 * IEEE 802.11, Chap 5.5. 1446 * 1447 * mac80211 filters only based on association state, i.e. it drops 1448 * Class 3 frames from not associated stations. hostapd sends 1449 * deauth/disassoc frames when needed. In addition, hostapd is 1450 * responsible for filtering on both auth and assoc states. 1451 */ 1452 1453 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1454 return ieee80211_rx_mesh_check(rx); 1455 1456 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1457 ieee80211_is_pspoll(hdr->frame_control)) && 1458 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1459 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 1460 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1461 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1462 /* 1463 * accept port control frames from the AP even when it's not 1464 * yet marked ASSOC to prevent a race where we don't set the 1465 * assoc bit quickly enough before it sends the first frame 1466 */ 1467 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1468 ieee80211_is_data_present(hdr->frame_control)) { 1469 unsigned int hdrlen; 1470 __be16 ethertype; 1471 1472 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1473 1474 if (rx->skb->len < hdrlen + 8) 1475 return RX_DROP_MONITOR; 1476 1477 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1478 if (ethertype == rx->sdata->control_port_protocol) 1479 return RX_CONTINUE; 1480 } 1481 1482 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1483 cfg80211_rx_spurious_frame(rx->sdata->dev, 1484 hdr->addr2, 1485 GFP_ATOMIC)) 1486 return RX_DROP_UNUSABLE; 1487 1488 return RX_DROP_MONITOR; 1489 } 1490 1491 return RX_CONTINUE; 1492 } 1493 1494 1495 static ieee80211_rx_result debug_noinline 1496 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1497 { 1498 struct ieee80211_local *local; 1499 struct ieee80211_hdr *hdr; 1500 struct sk_buff *skb; 1501 1502 local = rx->local; 1503 skb = rx->skb; 1504 hdr = (struct ieee80211_hdr *) skb->data; 1505 1506 if (!local->pspolling) 1507 return RX_CONTINUE; 1508 1509 if (!ieee80211_has_fromds(hdr->frame_control)) 1510 /* this is not from AP */ 1511 return RX_CONTINUE; 1512 1513 if (!ieee80211_is_data(hdr->frame_control)) 1514 return RX_CONTINUE; 1515 1516 if (!ieee80211_has_moredata(hdr->frame_control)) { 1517 /* AP has no more frames buffered for us */ 1518 local->pspolling = false; 1519 return RX_CONTINUE; 1520 } 1521 1522 /* more data bit is set, let's request a new frame from the AP */ 1523 ieee80211_send_pspoll(local, rx->sdata); 1524 1525 return RX_CONTINUE; 1526 } 1527 1528 static void sta_ps_start(struct sta_info *sta) 1529 { 1530 struct ieee80211_sub_if_data *sdata = sta->sdata; 1531 struct ieee80211_local *local = sdata->local; 1532 struct ps_data *ps; 1533 int tid; 1534 1535 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1536 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1537 ps = &sdata->bss->ps; 1538 else 1539 return; 1540 1541 atomic_inc(&ps->num_sta_ps); 1542 set_sta_flag(sta, WLAN_STA_PS_STA); 1543 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1544 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1545 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1546 sta->sta.addr, sta->sta.aid); 1547 1548 ieee80211_clear_fast_xmit(sta); 1549 1550 if (!sta->sta.txq[0]) 1551 return; 1552 1553 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 1554 if (txq_has_queue(sta->sta.txq[tid])) 1555 set_bit(tid, &sta->txq_buffered_tids); 1556 else 1557 clear_bit(tid, &sta->txq_buffered_tids); 1558 } 1559 } 1560 1561 static void sta_ps_end(struct sta_info *sta) 1562 { 1563 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1564 sta->sta.addr, sta->sta.aid); 1565 1566 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1567 /* 1568 * Clear the flag only if the other one is still set 1569 * so that the TX path won't start TX'ing new frames 1570 * directly ... In the case that the driver flag isn't 1571 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1572 */ 1573 clear_sta_flag(sta, WLAN_STA_PS_STA); 1574 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1575 sta->sta.addr, sta->sta.aid); 1576 return; 1577 } 1578 1579 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1580 clear_sta_flag(sta, WLAN_STA_PS_STA); 1581 ieee80211_sta_ps_deliver_wakeup(sta); 1582 } 1583 1584 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1585 { 1586 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1587 bool in_ps; 1588 1589 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1590 1591 /* Don't let the same PS state be set twice */ 1592 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1593 if ((start && in_ps) || (!start && !in_ps)) 1594 return -EINVAL; 1595 1596 if (start) 1597 sta_ps_start(sta); 1598 else 1599 sta_ps_end(sta); 1600 1601 return 0; 1602 } 1603 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1604 1605 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) 1606 { 1607 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1608 1609 if (test_sta_flag(sta, WLAN_STA_SP)) 1610 return; 1611 1612 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1613 ieee80211_sta_ps_deliver_poll_response(sta); 1614 else 1615 set_sta_flag(sta, WLAN_STA_PSPOLL); 1616 } 1617 EXPORT_SYMBOL(ieee80211_sta_pspoll); 1618 1619 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) 1620 { 1621 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1622 int ac = ieee80211_ac_from_tid(tid); 1623 1624 /* 1625 * If this AC is not trigger-enabled do nothing unless the 1626 * driver is calling us after it already checked. 1627 * 1628 * NB: This could/should check a separate bitmap of trigger- 1629 * enabled queues, but for now we only implement uAPSD w/o 1630 * TSPEC changes to the ACs, so they're always the same. 1631 */ 1632 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && 1633 tid != IEEE80211_NUM_TIDS) 1634 return; 1635 1636 /* if we are in a service period, do nothing */ 1637 if (test_sta_flag(sta, WLAN_STA_SP)) 1638 return; 1639 1640 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1641 ieee80211_sta_ps_deliver_uapsd(sta); 1642 else 1643 set_sta_flag(sta, WLAN_STA_UAPSD); 1644 } 1645 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); 1646 1647 static ieee80211_rx_result debug_noinline 1648 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1649 { 1650 struct ieee80211_sub_if_data *sdata = rx->sdata; 1651 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1652 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1653 1654 if (!rx->sta) 1655 return RX_CONTINUE; 1656 1657 if (sdata->vif.type != NL80211_IFTYPE_AP && 1658 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1659 return RX_CONTINUE; 1660 1661 /* 1662 * The device handles station powersave, so don't do anything about 1663 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1664 * it to mac80211 since they're handled.) 1665 */ 1666 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1667 return RX_CONTINUE; 1668 1669 /* 1670 * Don't do anything if the station isn't already asleep. In 1671 * the uAPSD case, the station will probably be marked asleep, 1672 * in the PS-Poll case the station must be confused ... 1673 */ 1674 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1675 return RX_CONTINUE; 1676 1677 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1678 ieee80211_sta_pspoll(&rx->sta->sta); 1679 1680 /* Free PS Poll skb here instead of returning RX_DROP that would 1681 * count as an dropped frame. */ 1682 dev_kfree_skb(rx->skb); 1683 1684 return RX_QUEUED; 1685 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1686 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1687 ieee80211_has_pm(hdr->frame_control) && 1688 (ieee80211_is_data_qos(hdr->frame_control) || 1689 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1690 u8 tid = ieee80211_get_tid(hdr); 1691 1692 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); 1693 } 1694 1695 return RX_CONTINUE; 1696 } 1697 1698 static ieee80211_rx_result debug_noinline 1699 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1700 { 1701 struct sta_info *sta = rx->sta; 1702 struct sk_buff *skb = rx->skb; 1703 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1704 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1705 int i; 1706 1707 if (!sta) 1708 return RX_CONTINUE; 1709 1710 /* 1711 * Update last_rx only for IBSS packets which are for the current 1712 * BSSID and for station already AUTHORIZED to avoid keeping the 1713 * current IBSS network alive in cases where other STAs start 1714 * using different BSSID. This will also give the station another 1715 * chance to restart the authentication/authorization in case 1716 * something went wrong the first time. 1717 */ 1718 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1719 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1720 NL80211_IFTYPE_ADHOC); 1721 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1722 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1723 sta->rx_stats.last_rx = jiffies; 1724 if (ieee80211_is_data(hdr->frame_control) && 1725 !is_multicast_ether_addr(hdr->addr1)) 1726 sta->rx_stats.last_rate = 1727 sta_stats_encode_rate(status); 1728 } 1729 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1730 sta->rx_stats.last_rx = jiffies; 1731 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1732 /* 1733 * Mesh beacons will update last_rx when if they are found to 1734 * match the current local configuration when processed. 1735 */ 1736 sta->rx_stats.last_rx = jiffies; 1737 if (ieee80211_is_data(hdr->frame_control)) 1738 sta->rx_stats.last_rate = sta_stats_encode_rate(status); 1739 } 1740 1741 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1742 ieee80211_sta_rx_notify(rx->sdata, hdr); 1743 1744 sta->rx_stats.fragments++; 1745 1746 u64_stats_update_begin(&rx->sta->rx_stats.syncp); 1747 sta->rx_stats.bytes += rx->skb->len; 1748 u64_stats_update_end(&rx->sta->rx_stats.syncp); 1749 1750 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1751 sta->rx_stats.last_signal = status->signal; 1752 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal); 1753 } 1754 1755 if (status->chains) { 1756 sta->rx_stats.chains = status->chains; 1757 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1758 int signal = status->chain_signal[i]; 1759 1760 if (!(status->chains & BIT(i))) 1761 continue; 1762 1763 sta->rx_stats.chain_signal_last[i] = signal; 1764 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], 1765 -signal); 1766 } 1767 } 1768 1769 /* 1770 * Change STA power saving mode only at the end of a frame 1771 * exchange sequence, and only for a data or management 1772 * frame as specified in IEEE 802.11-2016 11.2.3.2 1773 */ 1774 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1775 !ieee80211_has_morefrags(hdr->frame_control) && 1776 !is_multicast_ether_addr(hdr->addr1) && 1777 (ieee80211_is_mgmt(hdr->frame_control) || 1778 ieee80211_is_data(hdr->frame_control)) && 1779 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1780 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1781 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1782 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1783 if (!ieee80211_has_pm(hdr->frame_control)) 1784 sta_ps_end(sta); 1785 } else { 1786 if (ieee80211_has_pm(hdr->frame_control)) 1787 sta_ps_start(sta); 1788 } 1789 } 1790 1791 /* mesh power save support */ 1792 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1793 ieee80211_mps_rx_h_sta_process(sta, hdr); 1794 1795 /* 1796 * Drop (qos-)data::nullfunc frames silently, since they 1797 * are used only to control station power saving mode. 1798 */ 1799 if (ieee80211_is_nullfunc(hdr->frame_control) || 1800 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1801 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1802 1803 /* 1804 * If we receive a 4-addr nullfunc frame from a STA 1805 * that was not moved to a 4-addr STA vlan yet send 1806 * the event to userspace and for older hostapd drop 1807 * the frame to the monitor interface. 1808 */ 1809 if (ieee80211_has_a4(hdr->frame_control) && 1810 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1811 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1812 !rx->sdata->u.vlan.sta))) { 1813 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1814 cfg80211_rx_unexpected_4addr_frame( 1815 rx->sdata->dev, sta->sta.addr, 1816 GFP_ATOMIC); 1817 return RX_DROP_MONITOR; 1818 } 1819 /* 1820 * Update counter and free packet here to avoid 1821 * counting this as a dropped packed. 1822 */ 1823 sta->rx_stats.packets++; 1824 dev_kfree_skb(rx->skb); 1825 return RX_QUEUED; 1826 } 1827 1828 return RX_CONTINUE; 1829 } /* ieee80211_rx_h_sta_process */ 1830 1831 static ieee80211_rx_result debug_noinline 1832 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1833 { 1834 struct sk_buff *skb = rx->skb; 1835 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1836 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1837 int keyidx; 1838 int hdrlen; 1839 ieee80211_rx_result result = RX_DROP_UNUSABLE; 1840 struct ieee80211_key *sta_ptk = NULL; 1841 int mmie_keyidx = -1; 1842 __le16 fc; 1843 const struct ieee80211_cipher_scheme *cs = NULL; 1844 1845 /* 1846 * Key selection 101 1847 * 1848 * There are four types of keys: 1849 * - GTK (group keys) 1850 * - IGTK (group keys for management frames) 1851 * - PTK (pairwise keys) 1852 * - STK (station-to-station pairwise keys) 1853 * 1854 * When selecting a key, we have to distinguish between multicast 1855 * (including broadcast) and unicast frames, the latter can only 1856 * use PTKs and STKs while the former always use GTKs and IGTKs. 1857 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 1858 * unicast frames can also use key indices like GTKs. Hence, if we 1859 * don't have a PTK/STK we check the key index for a WEP key. 1860 * 1861 * Note that in a regular BSS, multicast frames are sent by the 1862 * AP only, associated stations unicast the frame to the AP first 1863 * which then multicasts it on their behalf. 1864 * 1865 * There is also a slight problem in IBSS mode: GTKs are negotiated 1866 * with each station, that is something we don't currently handle. 1867 * The spec seems to expect that one negotiates the same key with 1868 * every station but there's no such requirement; VLANs could be 1869 * possible. 1870 */ 1871 1872 /* start without a key */ 1873 rx->key = NULL; 1874 fc = hdr->frame_control; 1875 1876 if (rx->sta) { 1877 int keyid = rx->sta->ptk_idx; 1878 1879 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) { 1880 cs = rx->sta->cipher_scheme; 1881 keyid = ieee80211_get_cs_keyid(cs, rx->skb); 1882 if (unlikely(keyid < 0)) 1883 return RX_DROP_UNUSABLE; 1884 } 1885 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1886 } 1887 1888 if (!ieee80211_has_protected(fc)) 1889 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1890 1891 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1892 rx->key = sta_ptk; 1893 if ((status->flag & RX_FLAG_DECRYPTED) && 1894 (status->flag & RX_FLAG_IV_STRIPPED)) 1895 return RX_CONTINUE; 1896 /* Skip decryption if the frame is not protected. */ 1897 if (!ieee80211_has_protected(fc)) 1898 return RX_CONTINUE; 1899 } else if (mmie_keyidx >= 0) { 1900 /* Broadcast/multicast robust management frame / BIP */ 1901 if ((status->flag & RX_FLAG_DECRYPTED) && 1902 (status->flag & RX_FLAG_IV_STRIPPED)) 1903 return RX_CONTINUE; 1904 1905 if (mmie_keyidx < NUM_DEFAULT_KEYS || 1906 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1907 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1908 if (rx->sta) { 1909 if (ieee80211_is_group_privacy_action(skb) && 1910 test_sta_flag(rx->sta, WLAN_STA_MFP)) 1911 return RX_DROP_MONITOR; 1912 1913 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 1914 } 1915 if (!rx->key) 1916 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 1917 } else if (!ieee80211_has_protected(fc)) { 1918 /* 1919 * The frame was not protected, so skip decryption. However, we 1920 * need to set rx->key if there is a key that could have been 1921 * used so that the frame may be dropped if encryption would 1922 * have been expected. 1923 */ 1924 struct ieee80211_key *key = NULL; 1925 struct ieee80211_sub_if_data *sdata = rx->sdata; 1926 int i; 1927 1928 if (ieee80211_is_mgmt(fc) && 1929 is_multicast_ether_addr(hdr->addr1) && 1930 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 1931 rx->key = key; 1932 else { 1933 if (rx->sta) { 1934 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1935 key = rcu_dereference(rx->sta->gtk[i]); 1936 if (key) 1937 break; 1938 } 1939 } 1940 if (!key) { 1941 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1942 key = rcu_dereference(sdata->keys[i]); 1943 if (key) 1944 break; 1945 } 1946 } 1947 if (key) 1948 rx->key = key; 1949 } 1950 return RX_CONTINUE; 1951 } else { 1952 u8 keyid; 1953 1954 /* 1955 * The device doesn't give us the IV so we won't be 1956 * able to look up the key. That's ok though, we 1957 * don't need to decrypt the frame, we just won't 1958 * be able to keep statistics accurate. 1959 * Except for key threshold notifications, should 1960 * we somehow allow the driver to tell us which key 1961 * the hardware used if this flag is set? 1962 */ 1963 if ((status->flag & RX_FLAG_DECRYPTED) && 1964 (status->flag & RX_FLAG_IV_STRIPPED)) 1965 return RX_CONTINUE; 1966 1967 hdrlen = ieee80211_hdrlen(fc); 1968 1969 if (cs) { 1970 keyidx = ieee80211_get_cs_keyid(cs, rx->skb); 1971 1972 if (unlikely(keyidx < 0)) 1973 return RX_DROP_UNUSABLE; 1974 } else { 1975 if (rx->skb->len < 8 + hdrlen) 1976 return RX_DROP_UNUSABLE; /* TODO: count this? */ 1977 /* 1978 * no need to call ieee80211_wep_get_keyidx, 1979 * it verifies a bunch of things we've done already 1980 */ 1981 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 1982 keyidx = keyid >> 6; 1983 } 1984 1985 /* check per-station GTK first, if multicast packet */ 1986 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1987 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1988 1989 /* if not found, try default key */ 1990 if (!rx->key) { 1991 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1992 1993 /* 1994 * RSNA-protected unicast frames should always be 1995 * sent with pairwise or station-to-station keys, 1996 * but for WEP we allow using a key index as well. 1997 */ 1998 if (rx->key && 1999 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 2000 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 2001 !is_multicast_ether_addr(hdr->addr1)) 2002 rx->key = NULL; 2003 } 2004 } 2005 2006 if (rx->key) { 2007 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 2008 return RX_DROP_MONITOR; 2009 2010 /* TODO: add threshold stuff again */ 2011 } else { 2012 return RX_DROP_MONITOR; 2013 } 2014 2015 switch (rx->key->conf.cipher) { 2016 case WLAN_CIPHER_SUITE_WEP40: 2017 case WLAN_CIPHER_SUITE_WEP104: 2018 result = ieee80211_crypto_wep_decrypt(rx); 2019 break; 2020 case WLAN_CIPHER_SUITE_TKIP: 2021 result = ieee80211_crypto_tkip_decrypt(rx); 2022 break; 2023 case WLAN_CIPHER_SUITE_CCMP: 2024 result = ieee80211_crypto_ccmp_decrypt( 2025 rx, IEEE80211_CCMP_MIC_LEN); 2026 break; 2027 case WLAN_CIPHER_SUITE_CCMP_256: 2028 result = ieee80211_crypto_ccmp_decrypt( 2029 rx, IEEE80211_CCMP_256_MIC_LEN); 2030 break; 2031 case WLAN_CIPHER_SUITE_AES_CMAC: 2032 result = ieee80211_crypto_aes_cmac_decrypt(rx); 2033 break; 2034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2035 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 2036 break; 2037 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2038 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2039 result = ieee80211_crypto_aes_gmac_decrypt(rx); 2040 break; 2041 case WLAN_CIPHER_SUITE_GCMP: 2042 case WLAN_CIPHER_SUITE_GCMP_256: 2043 result = ieee80211_crypto_gcmp_decrypt(rx); 2044 break; 2045 default: 2046 result = ieee80211_crypto_hw_decrypt(rx); 2047 } 2048 2049 /* the hdr variable is invalid after the decrypt handlers */ 2050 2051 /* either the frame has been decrypted or will be dropped */ 2052 status->flag |= RX_FLAG_DECRYPTED; 2053 2054 return result; 2055 } 2056 2057 static inline struct ieee80211_fragment_entry * 2058 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, 2059 unsigned int frag, unsigned int seq, int rx_queue, 2060 struct sk_buff **skb) 2061 { 2062 struct ieee80211_fragment_entry *entry; 2063 2064 entry = &sdata->fragments[sdata->fragment_next++]; 2065 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) 2066 sdata->fragment_next = 0; 2067 2068 if (!skb_queue_empty(&entry->skb_list)) 2069 __skb_queue_purge(&entry->skb_list); 2070 2071 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 2072 *skb = NULL; 2073 entry->first_frag_time = jiffies; 2074 entry->seq = seq; 2075 entry->rx_queue = rx_queue; 2076 entry->last_frag = frag; 2077 entry->check_sequential_pn = false; 2078 entry->extra_len = 0; 2079 2080 return entry; 2081 } 2082 2083 static inline struct ieee80211_fragment_entry * 2084 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, 2085 unsigned int frag, unsigned int seq, 2086 int rx_queue, struct ieee80211_hdr *hdr) 2087 { 2088 struct ieee80211_fragment_entry *entry; 2089 int i, idx; 2090 2091 idx = sdata->fragment_next; 2092 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 2093 struct ieee80211_hdr *f_hdr; 2094 struct sk_buff *f_skb; 2095 2096 idx--; 2097 if (idx < 0) 2098 idx = IEEE80211_FRAGMENT_MAX - 1; 2099 2100 entry = &sdata->fragments[idx]; 2101 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 2102 entry->rx_queue != rx_queue || 2103 entry->last_frag + 1 != frag) 2104 continue; 2105 2106 f_skb = __skb_peek(&entry->skb_list); 2107 f_hdr = (struct ieee80211_hdr *) f_skb->data; 2108 2109 /* 2110 * Check ftype and addresses are equal, else check next fragment 2111 */ 2112 if (((hdr->frame_control ^ f_hdr->frame_control) & 2113 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 2114 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 2115 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 2116 continue; 2117 2118 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 2119 __skb_queue_purge(&entry->skb_list); 2120 continue; 2121 } 2122 return entry; 2123 } 2124 2125 return NULL; 2126 } 2127 2128 static ieee80211_rx_result debug_noinline 2129 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 2130 { 2131 struct ieee80211_hdr *hdr; 2132 u16 sc; 2133 __le16 fc; 2134 unsigned int frag, seq; 2135 struct ieee80211_fragment_entry *entry; 2136 struct sk_buff *skb; 2137 2138 hdr = (struct ieee80211_hdr *)rx->skb->data; 2139 fc = hdr->frame_control; 2140 2141 if (ieee80211_is_ctl(fc)) 2142 return RX_CONTINUE; 2143 2144 sc = le16_to_cpu(hdr->seq_ctrl); 2145 frag = sc & IEEE80211_SCTL_FRAG; 2146 2147 if (is_multicast_ether_addr(hdr->addr1)) { 2148 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount); 2149 goto out_no_led; 2150 } 2151 2152 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 2153 goto out; 2154 2155 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 2156 2157 if (skb_linearize(rx->skb)) 2158 return RX_DROP_UNUSABLE; 2159 2160 /* 2161 * skb_linearize() might change the skb->data and 2162 * previously cached variables (in this case, hdr) need to 2163 * be refreshed with the new data. 2164 */ 2165 hdr = (struct ieee80211_hdr *)rx->skb->data; 2166 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 2167 2168 if (frag == 0) { 2169 /* This is the first fragment of a new frame. */ 2170 entry = ieee80211_reassemble_add(rx->sdata, frag, seq, 2171 rx->seqno_idx, &(rx->skb)); 2172 if (rx->key && 2173 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 2174 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || 2175 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || 2176 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && 2177 ieee80211_has_protected(fc)) { 2178 int queue = rx->security_idx; 2179 2180 /* Store CCMP/GCMP PN so that we can verify that the 2181 * next fragment has a sequential PN value. 2182 */ 2183 entry->check_sequential_pn = true; 2184 memcpy(entry->last_pn, 2185 rx->key->u.ccmp.rx_pn[queue], 2186 IEEE80211_CCMP_PN_LEN); 2187 BUILD_BUG_ON(offsetof(struct ieee80211_key, 2188 u.ccmp.rx_pn) != 2189 offsetof(struct ieee80211_key, 2190 u.gcmp.rx_pn)); 2191 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != 2192 sizeof(rx->key->u.gcmp.rx_pn[queue])); 2193 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != 2194 IEEE80211_GCMP_PN_LEN); 2195 } 2196 return RX_QUEUED; 2197 } 2198 2199 /* This is a fragment for a frame that should already be pending in 2200 * fragment cache. Add this fragment to the end of the pending entry. 2201 */ 2202 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, 2203 rx->seqno_idx, hdr); 2204 if (!entry) { 2205 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2206 return RX_DROP_MONITOR; 2207 } 2208 2209 /* "The receiver shall discard MSDUs and MMPDUs whose constituent 2210 * MPDU PN values are not incrementing in steps of 1." 2211 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) 2212 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) 2213 */ 2214 if (entry->check_sequential_pn) { 2215 int i; 2216 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 2217 int queue; 2218 2219 if (!rx->key || 2220 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP && 2221 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 && 2222 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP && 2223 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256)) 2224 return RX_DROP_UNUSABLE; 2225 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 2226 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 2227 pn[i]++; 2228 if (pn[i]) 2229 break; 2230 } 2231 queue = rx->security_idx; 2232 rpn = rx->key->u.ccmp.rx_pn[queue]; 2233 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 2234 return RX_DROP_UNUSABLE; 2235 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 2236 } 2237 2238 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 2239 __skb_queue_tail(&entry->skb_list, rx->skb); 2240 entry->last_frag = frag; 2241 entry->extra_len += rx->skb->len; 2242 if (ieee80211_has_morefrags(fc)) { 2243 rx->skb = NULL; 2244 return RX_QUEUED; 2245 } 2246 2247 rx->skb = __skb_dequeue(&entry->skb_list); 2248 if (skb_tailroom(rx->skb) < entry->extra_len) { 2249 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 2250 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 2251 GFP_ATOMIC))) { 2252 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 2253 __skb_queue_purge(&entry->skb_list); 2254 return RX_DROP_UNUSABLE; 2255 } 2256 } 2257 while ((skb = __skb_dequeue(&entry->skb_list))) { 2258 skb_put_data(rx->skb, skb->data, skb->len); 2259 dev_kfree_skb(skb); 2260 } 2261 2262 out: 2263 ieee80211_led_rx(rx->local); 2264 out_no_led: 2265 if (rx->sta) 2266 rx->sta->rx_stats.packets++; 2267 return RX_CONTINUE; 2268 } 2269 2270 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 2271 { 2272 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 2273 return -EACCES; 2274 2275 return 0; 2276 } 2277 2278 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 2279 { 2280 struct sk_buff *skb = rx->skb; 2281 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2282 2283 /* 2284 * Pass through unencrypted frames if the hardware has 2285 * decrypted them already. 2286 */ 2287 if (status->flag & RX_FLAG_DECRYPTED) 2288 return 0; 2289 2290 /* Drop unencrypted frames if key is set. */ 2291 if (unlikely(!ieee80211_has_protected(fc) && 2292 !ieee80211_is_nullfunc(fc) && 2293 ieee80211_is_data(fc) && rx->key)) 2294 return -EACCES; 2295 2296 return 0; 2297 } 2298 2299 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 2300 { 2301 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2302 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2303 __le16 fc = hdr->frame_control; 2304 2305 /* 2306 * Pass through unencrypted frames if the hardware has 2307 * decrypted them already. 2308 */ 2309 if (status->flag & RX_FLAG_DECRYPTED) 2310 return 0; 2311 2312 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 2313 if (unlikely(!ieee80211_has_protected(fc) && 2314 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 2315 rx->key)) { 2316 if (ieee80211_is_deauth(fc) || 2317 ieee80211_is_disassoc(fc)) 2318 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2319 rx->skb->data, 2320 rx->skb->len); 2321 return -EACCES; 2322 } 2323 /* BIP does not use Protected field, so need to check MMIE */ 2324 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 2325 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 2326 if (ieee80211_is_deauth(fc) || 2327 ieee80211_is_disassoc(fc)) 2328 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 2329 rx->skb->data, 2330 rx->skb->len); 2331 return -EACCES; 2332 } 2333 /* 2334 * When using MFP, Action frames are not allowed prior to 2335 * having configured keys. 2336 */ 2337 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2338 ieee80211_is_robust_mgmt_frame(rx->skb))) 2339 return -EACCES; 2340 } 2341 2342 return 0; 2343 } 2344 2345 static int 2346 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2347 { 2348 struct ieee80211_sub_if_data *sdata = rx->sdata; 2349 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2350 bool check_port_control = false; 2351 struct ethhdr *ehdr; 2352 int ret; 2353 2354 *port_control = false; 2355 if (ieee80211_has_a4(hdr->frame_control) && 2356 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2357 return -1; 2358 2359 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2360 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2361 2362 if (!sdata->u.mgd.use_4addr) 2363 return -1; 2364 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) 2365 check_port_control = true; 2366 } 2367 2368 if (is_multicast_ether_addr(hdr->addr1) && 2369 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2370 return -1; 2371 2372 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2373 if (ret < 0) 2374 return ret; 2375 2376 ehdr = (struct ethhdr *) rx->skb->data; 2377 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2378 *port_control = true; 2379 else if (check_port_control) 2380 return -1; 2381 2382 return 0; 2383 } 2384 2385 /* 2386 * requires that rx->skb is a frame with ethernet header 2387 */ 2388 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2389 { 2390 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2391 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2392 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2393 2394 /* 2395 * Allow EAPOL frames to us/the PAE group address regardless 2396 * of whether the frame was encrypted or not. 2397 */ 2398 if (ehdr->h_proto == rx->sdata->control_port_protocol && 2399 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || 2400 ether_addr_equal(ehdr->h_dest, pae_group_addr))) 2401 return true; 2402 2403 if (ieee80211_802_1x_port_control(rx) || 2404 ieee80211_drop_unencrypted(rx, fc)) 2405 return false; 2406 2407 return true; 2408 } 2409 2410 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, 2411 struct ieee80211_rx_data *rx) 2412 { 2413 struct ieee80211_sub_if_data *sdata = rx->sdata; 2414 struct net_device *dev = sdata->dev; 2415 2416 if (unlikely((skb->protocol == sdata->control_port_protocol || 2417 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) && 2418 sdata->control_port_over_nl80211)) { 2419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2420 bool noencrypt = status->flag & RX_FLAG_DECRYPTED; 2421 2422 cfg80211_rx_control_port(dev, skb, noencrypt); 2423 dev_kfree_skb(skb); 2424 } else { 2425 /* deliver to local stack */ 2426 if (rx->napi) 2427 napi_gro_receive(rx->napi, skb); 2428 else 2429 netif_receive_skb(skb); 2430 } 2431 } 2432 2433 /* 2434 * requires that rx->skb is a frame with ethernet header 2435 */ 2436 static void 2437 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2438 { 2439 struct ieee80211_sub_if_data *sdata = rx->sdata; 2440 struct net_device *dev = sdata->dev; 2441 struct sk_buff *skb, *xmit_skb; 2442 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2443 struct sta_info *dsta; 2444 2445 skb = rx->skb; 2446 xmit_skb = NULL; 2447 2448 ieee80211_rx_stats(dev, skb->len); 2449 2450 if (rx->sta) { 2451 /* The seqno index has the same property as needed 2452 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2453 * for non-QoS-data frames. Here we know it's a data 2454 * frame, so count MSDUs. 2455 */ 2456 u64_stats_update_begin(&rx->sta->rx_stats.syncp); 2457 rx->sta->rx_stats.msdu[rx->seqno_idx]++; 2458 u64_stats_update_end(&rx->sta->rx_stats.syncp); 2459 } 2460 2461 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2462 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2463 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2464 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2465 if (is_multicast_ether_addr(ehdr->h_dest) && 2466 ieee80211_vif_get_num_mcast_if(sdata) != 0) { 2467 /* 2468 * send multicast frames both to higher layers in 2469 * local net stack and back to the wireless medium 2470 */ 2471 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2472 if (!xmit_skb) 2473 net_info_ratelimited("%s: failed to clone multicast frame\n", 2474 dev->name); 2475 } else if (!is_multicast_ether_addr(ehdr->h_dest) && 2476 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { 2477 dsta = sta_info_get(sdata, ehdr->h_dest); 2478 if (dsta) { 2479 /* 2480 * The destination station is associated to 2481 * this AP (in this VLAN), so send the frame 2482 * directly to it and do not pass it to local 2483 * net stack. 2484 */ 2485 xmit_skb = skb; 2486 skb = NULL; 2487 } 2488 } 2489 } 2490 2491 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2492 if (skb) { 2493 /* 'align' will only take the values 0 or 2 here since all 2494 * frames are required to be aligned to 2-byte boundaries 2495 * when being passed to mac80211; the code here works just 2496 * as well if that isn't true, but mac80211 assumes it can 2497 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2498 */ 2499 int align; 2500 2501 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2502 if (align) { 2503 if (WARN_ON(skb_headroom(skb) < 3)) { 2504 dev_kfree_skb(skb); 2505 skb = NULL; 2506 } else { 2507 u8 *data = skb->data; 2508 size_t len = skb_headlen(skb); 2509 skb->data -= align; 2510 memmove(skb->data, data, len); 2511 skb_set_tail_pointer(skb, len); 2512 } 2513 } 2514 } 2515 #endif 2516 2517 if (skb) { 2518 skb->protocol = eth_type_trans(skb, dev); 2519 memset(skb->cb, 0, sizeof(skb->cb)); 2520 2521 ieee80211_deliver_skb_to_local_stack(skb, rx); 2522 } 2523 2524 if (xmit_skb) { 2525 /* 2526 * Send to wireless media and increase priority by 256 to 2527 * keep the received priority instead of reclassifying 2528 * the frame (see cfg80211_classify8021d). 2529 */ 2530 xmit_skb->priority += 256; 2531 xmit_skb->protocol = htons(ETH_P_802_3); 2532 skb_reset_network_header(xmit_skb); 2533 skb_reset_mac_header(xmit_skb); 2534 dev_queue_xmit(xmit_skb); 2535 } 2536 } 2537 2538 static ieee80211_rx_result debug_noinline 2539 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) 2540 { 2541 struct net_device *dev = rx->sdata->dev; 2542 struct sk_buff *skb = rx->skb; 2543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2544 __le16 fc = hdr->frame_control; 2545 struct sk_buff_head frame_list; 2546 struct ethhdr ethhdr; 2547 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; 2548 2549 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 2550 check_da = NULL; 2551 check_sa = NULL; 2552 } else switch (rx->sdata->vif.type) { 2553 case NL80211_IFTYPE_AP: 2554 case NL80211_IFTYPE_AP_VLAN: 2555 check_da = NULL; 2556 break; 2557 case NL80211_IFTYPE_STATION: 2558 if (!rx->sta || 2559 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) 2560 check_sa = NULL; 2561 break; 2562 case NL80211_IFTYPE_MESH_POINT: 2563 check_sa = NULL; 2564 break; 2565 default: 2566 break; 2567 } 2568 2569 skb->dev = dev; 2570 __skb_queue_head_init(&frame_list); 2571 2572 if (ieee80211_data_to_8023_exthdr(skb, ðhdr, 2573 rx->sdata->vif.addr, 2574 rx->sdata->vif.type, 2575 data_offset)) 2576 return RX_DROP_UNUSABLE; 2577 2578 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 2579 rx->sdata->vif.type, 2580 rx->local->hw.extra_tx_headroom, 2581 check_da, check_sa); 2582 2583 while (!skb_queue_empty(&frame_list)) { 2584 rx->skb = __skb_dequeue(&frame_list); 2585 2586 if (!ieee80211_frame_allowed(rx, fc)) { 2587 dev_kfree_skb(rx->skb); 2588 continue; 2589 } 2590 2591 ieee80211_deliver_skb(rx); 2592 } 2593 2594 return RX_QUEUED; 2595 } 2596 2597 static ieee80211_rx_result debug_noinline 2598 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 2599 { 2600 struct sk_buff *skb = rx->skb; 2601 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2602 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2603 __le16 fc = hdr->frame_control; 2604 2605 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 2606 return RX_CONTINUE; 2607 2608 if (unlikely(!ieee80211_is_data(fc))) 2609 return RX_CONTINUE; 2610 2611 if (unlikely(!ieee80211_is_data_present(fc))) 2612 return RX_DROP_MONITOR; 2613 2614 if (unlikely(ieee80211_has_a4(hdr->frame_control))) { 2615 switch (rx->sdata->vif.type) { 2616 case NL80211_IFTYPE_AP_VLAN: 2617 if (!rx->sdata->u.vlan.sta) 2618 return RX_DROP_UNUSABLE; 2619 break; 2620 case NL80211_IFTYPE_STATION: 2621 if (!rx->sdata->u.mgd.use_4addr) 2622 return RX_DROP_UNUSABLE; 2623 break; 2624 default: 2625 return RX_DROP_UNUSABLE; 2626 } 2627 } 2628 2629 if (is_multicast_ether_addr(hdr->addr1)) 2630 return RX_DROP_UNUSABLE; 2631 2632 return __ieee80211_rx_h_amsdu(rx, 0); 2633 } 2634 2635 #ifdef CONFIG_MAC80211_MESH 2636 static ieee80211_rx_result 2637 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 2638 { 2639 struct ieee80211_hdr *fwd_hdr, *hdr; 2640 struct ieee80211_tx_info *info; 2641 struct ieee80211s_hdr *mesh_hdr; 2642 struct sk_buff *skb = rx->skb, *fwd_skb; 2643 struct ieee80211_local *local = rx->local; 2644 struct ieee80211_sub_if_data *sdata = rx->sdata; 2645 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2646 u16 ac, q, hdrlen; 2647 2648 hdr = (struct ieee80211_hdr *) skb->data; 2649 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2650 2651 /* make sure fixed part of mesh header is there, also checks skb len */ 2652 if (!pskb_may_pull(rx->skb, hdrlen + 6)) 2653 return RX_DROP_MONITOR; 2654 2655 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2656 2657 /* make sure full mesh header is there, also checks skb len */ 2658 if (!pskb_may_pull(rx->skb, 2659 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) 2660 return RX_DROP_MONITOR; 2661 2662 /* reload pointers */ 2663 hdr = (struct ieee80211_hdr *) skb->data; 2664 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2665 2666 if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) 2667 return RX_DROP_MONITOR; 2668 2669 /* frame is in RMC, don't forward */ 2670 if (ieee80211_is_data(hdr->frame_control) && 2671 is_multicast_ether_addr(hdr->addr1) && 2672 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) 2673 return RX_DROP_MONITOR; 2674 2675 if (!ieee80211_is_data(hdr->frame_control)) 2676 return RX_CONTINUE; 2677 2678 if (!mesh_hdr->ttl) 2679 return RX_DROP_MONITOR; 2680 2681 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2682 struct mesh_path *mppath; 2683 char *proxied_addr; 2684 char *mpp_addr; 2685 2686 if (is_multicast_ether_addr(hdr->addr1)) { 2687 mpp_addr = hdr->addr3; 2688 proxied_addr = mesh_hdr->eaddr1; 2689 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) == 2690 MESH_FLAGS_AE_A5_A6) { 2691 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2692 mpp_addr = hdr->addr4; 2693 proxied_addr = mesh_hdr->eaddr2; 2694 } else { 2695 return RX_DROP_MONITOR; 2696 } 2697 2698 rcu_read_lock(); 2699 mppath = mpp_path_lookup(sdata, proxied_addr); 2700 if (!mppath) { 2701 mpp_path_add(sdata, proxied_addr, mpp_addr); 2702 } else { 2703 spin_lock_bh(&mppath->state_lock); 2704 if (!ether_addr_equal(mppath->mpp, mpp_addr)) 2705 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 2706 mppath->exp_time = jiffies; 2707 spin_unlock_bh(&mppath->state_lock); 2708 } 2709 rcu_read_unlock(); 2710 } 2711 2712 /* Frame has reached destination. Don't forward */ 2713 if (!is_multicast_ether_addr(hdr->addr1) && 2714 ether_addr_equal(sdata->vif.addr, hdr->addr3)) 2715 return RX_CONTINUE; 2716 2717 ac = ieee80211_select_queue_80211(sdata, skb, hdr); 2718 q = sdata->vif.hw_queue[ac]; 2719 if (ieee80211_queue_stopped(&local->hw, q)) { 2720 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 2721 return RX_DROP_MONITOR; 2722 } 2723 skb_set_queue_mapping(skb, q); 2724 2725 if (!--mesh_hdr->ttl) { 2726 if (!is_multicast_ether_addr(hdr->addr1)) 2727 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, 2728 dropped_frames_ttl); 2729 goto out; 2730 } 2731 2732 if (!ifmsh->mshcfg.dot11MeshForwarding) 2733 goto out; 2734 2735 fwd_skb = skb_copy_expand(skb, local->tx_headroom + 2736 sdata->encrypt_headroom, 0, GFP_ATOMIC); 2737 if (!fwd_skb) 2738 goto out; 2739 2740 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 2741 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); 2742 info = IEEE80211_SKB_CB(fwd_skb); 2743 memset(info, 0, sizeof(*info)); 2744 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 2745 info->control.vif = &rx->sdata->vif; 2746 info->control.jiffies = jiffies; 2747 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 2748 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2749 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2750 /* update power mode indication when forwarding */ 2751 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2752 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2753 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2754 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2755 } else { 2756 /* unable to resolve next hop */ 2757 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2758 fwd_hdr->addr3, 0, 2759 WLAN_REASON_MESH_PATH_NOFORWARD, 2760 fwd_hdr->addr2); 2761 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 2762 kfree_skb(fwd_skb); 2763 return RX_DROP_MONITOR; 2764 } 2765 2766 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2767 ieee80211_add_pending_skb(local, fwd_skb); 2768 out: 2769 if (is_multicast_ether_addr(hdr->addr1)) 2770 return RX_CONTINUE; 2771 return RX_DROP_MONITOR; 2772 } 2773 #endif 2774 2775 static ieee80211_rx_result debug_noinline 2776 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 2777 { 2778 struct ieee80211_sub_if_data *sdata = rx->sdata; 2779 struct ieee80211_local *local = rx->local; 2780 struct net_device *dev = sdata->dev; 2781 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2782 __le16 fc = hdr->frame_control; 2783 bool port_control; 2784 int err; 2785 2786 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 2787 return RX_CONTINUE; 2788 2789 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 2790 return RX_DROP_MONITOR; 2791 2792 /* 2793 * Send unexpected-4addr-frame event to hostapd. For older versions, 2794 * also drop the frame to cooked monitor interfaces. 2795 */ 2796 if (ieee80211_has_a4(hdr->frame_control) && 2797 sdata->vif.type == NL80211_IFTYPE_AP) { 2798 if (rx->sta && 2799 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 2800 cfg80211_rx_unexpected_4addr_frame( 2801 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 2802 return RX_DROP_MONITOR; 2803 } 2804 2805 err = __ieee80211_data_to_8023(rx, &port_control); 2806 if (unlikely(err)) 2807 return RX_DROP_UNUSABLE; 2808 2809 if (!ieee80211_frame_allowed(rx, fc)) 2810 return RX_DROP_MONITOR; 2811 2812 /* directly handle TDLS channel switch requests/responses */ 2813 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 2814 cpu_to_be16(ETH_P_TDLS))) { 2815 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 2816 2817 if (pskb_may_pull(rx->skb, 2818 offsetof(struct ieee80211_tdls_data, u)) && 2819 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 2820 tf->category == WLAN_CATEGORY_TDLS && 2821 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 2822 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 2823 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb); 2824 schedule_work(&local->tdls_chsw_work); 2825 if (rx->sta) 2826 rx->sta->rx_stats.packets++; 2827 2828 return RX_QUEUED; 2829 } 2830 } 2831 2832 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2833 unlikely(port_control) && sdata->bss) { 2834 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2835 u.ap); 2836 dev = sdata->dev; 2837 rx->sdata = sdata; 2838 } 2839 2840 rx->skb->dev = dev; 2841 2842 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2843 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 2844 !is_multicast_ether_addr( 2845 ((struct ethhdr *)rx->skb->data)->h_dest) && 2846 (!local->scanning && 2847 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) 2848 mod_timer(&local->dynamic_ps_timer, jiffies + 2849 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 2850 2851 ieee80211_deliver_skb(rx); 2852 2853 return RX_QUEUED; 2854 } 2855 2856 static ieee80211_rx_result debug_noinline 2857 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 2858 { 2859 struct sk_buff *skb = rx->skb; 2860 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 2861 struct tid_ampdu_rx *tid_agg_rx; 2862 u16 start_seq_num; 2863 u16 tid; 2864 2865 if (likely(!ieee80211_is_ctl(bar->frame_control))) 2866 return RX_CONTINUE; 2867 2868 if (ieee80211_is_back_req(bar->frame_control)) { 2869 struct { 2870 __le16 control, start_seq_num; 2871 } __packed bar_data; 2872 struct ieee80211_event event = { 2873 .type = BAR_RX_EVENT, 2874 }; 2875 2876 if (!rx->sta) 2877 return RX_DROP_MONITOR; 2878 2879 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 2880 &bar_data, sizeof(bar_data))) 2881 return RX_DROP_MONITOR; 2882 2883 tid = le16_to_cpu(bar_data.control) >> 12; 2884 2885 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && 2886 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) 2887 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, 2888 WLAN_BACK_RECIPIENT, 2889 WLAN_REASON_QSTA_REQUIRE_SETUP); 2890 2891 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 2892 if (!tid_agg_rx) 2893 return RX_DROP_MONITOR; 2894 2895 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 2896 event.u.ba.tid = tid; 2897 event.u.ba.ssn = start_seq_num; 2898 event.u.ba.sta = &rx->sta->sta; 2899 2900 /* reset session timer */ 2901 if (tid_agg_rx->timeout) 2902 mod_timer(&tid_agg_rx->session_timer, 2903 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 2904 2905 spin_lock(&tid_agg_rx->reorder_lock); 2906 /* release stored frames up to start of BAR */ 2907 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 2908 start_seq_num, frames); 2909 spin_unlock(&tid_agg_rx->reorder_lock); 2910 2911 drv_event_callback(rx->local, rx->sdata, &event); 2912 2913 kfree_skb(skb); 2914 return RX_QUEUED; 2915 } 2916 2917 /* 2918 * After this point, we only want management frames, 2919 * so we can drop all remaining control frames to 2920 * cooked monitor interfaces. 2921 */ 2922 return RX_DROP_MONITOR; 2923 } 2924 2925 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 2926 struct ieee80211_mgmt *mgmt, 2927 size_t len) 2928 { 2929 struct ieee80211_local *local = sdata->local; 2930 struct sk_buff *skb; 2931 struct ieee80211_mgmt *resp; 2932 2933 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 2934 /* Not to own unicast address */ 2935 return; 2936 } 2937 2938 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || 2939 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { 2940 /* Not from the current AP or not associated yet. */ 2941 return; 2942 } 2943 2944 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 2945 /* Too short SA Query request frame */ 2946 return; 2947 } 2948 2949 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 2950 if (skb == NULL) 2951 return; 2952 2953 skb_reserve(skb, local->hw.extra_tx_headroom); 2954 resp = skb_put_zero(skb, 24); 2955 memcpy(resp->da, mgmt->sa, ETH_ALEN); 2956 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 2957 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 2958 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2959 IEEE80211_STYPE_ACTION); 2960 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 2961 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 2962 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 2963 memcpy(resp->u.action.u.sa_query.trans_id, 2964 mgmt->u.action.u.sa_query.trans_id, 2965 WLAN_SA_QUERY_TR_ID_LEN); 2966 2967 ieee80211_tx_skb(sdata, skb); 2968 } 2969 2970 static ieee80211_rx_result debug_noinline 2971 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 2972 { 2973 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2974 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2975 2976 /* 2977 * From here on, look only at management frames. 2978 * Data and control frames are already handled, 2979 * and unknown (reserved) frames are useless. 2980 */ 2981 if (rx->skb->len < 24) 2982 return RX_DROP_MONITOR; 2983 2984 if (!ieee80211_is_mgmt(mgmt->frame_control)) 2985 return RX_DROP_MONITOR; 2986 2987 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 2988 ieee80211_is_beacon(mgmt->frame_control) && 2989 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 2990 int sig = 0; 2991 2992 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 2993 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 2994 sig = status->signal; 2995 2996 cfg80211_report_obss_beacon(rx->local->hw.wiphy, 2997 rx->skb->data, rx->skb->len, 2998 status->freq, sig); 2999 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 3000 } 3001 3002 if (ieee80211_drop_unencrypted_mgmt(rx)) 3003 return RX_DROP_UNUSABLE; 3004 3005 return RX_CONTINUE; 3006 } 3007 3008 static ieee80211_rx_result debug_noinline 3009 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 3010 { 3011 struct ieee80211_local *local = rx->local; 3012 struct ieee80211_sub_if_data *sdata = rx->sdata; 3013 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3015 int len = rx->skb->len; 3016 3017 if (!ieee80211_is_action(mgmt->frame_control)) 3018 return RX_CONTINUE; 3019 3020 /* drop too small frames */ 3021 if (len < IEEE80211_MIN_ACTION_SIZE) 3022 return RX_DROP_UNUSABLE; 3023 3024 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 3025 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 3026 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 3027 return RX_DROP_UNUSABLE; 3028 3029 switch (mgmt->u.action.category) { 3030 case WLAN_CATEGORY_HT: 3031 /* reject HT action frames from stations not supporting HT */ 3032 if (!rx->sta->sta.ht_cap.ht_supported) 3033 goto invalid; 3034 3035 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3036 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3037 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3038 sdata->vif.type != NL80211_IFTYPE_AP && 3039 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3040 break; 3041 3042 /* verify action & smps_control/chanwidth are present */ 3043 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3044 goto invalid; 3045 3046 switch (mgmt->u.action.u.ht_smps.action) { 3047 case WLAN_HT_ACTION_SMPS: { 3048 struct ieee80211_supported_band *sband; 3049 enum ieee80211_smps_mode smps_mode; 3050 struct sta_opmode_info sta_opmode = {}; 3051 3052 /* convert to HT capability */ 3053 switch (mgmt->u.action.u.ht_smps.smps_control) { 3054 case WLAN_HT_SMPS_CONTROL_DISABLED: 3055 smps_mode = IEEE80211_SMPS_OFF; 3056 break; 3057 case WLAN_HT_SMPS_CONTROL_STATIC: 3058 smps_mode = IEEE80211_SMPS_STATIC; 3059 break; 3060 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 3061 smps_mode = IEEE80211_SMPS_DYNAMIC; 3062 break; 3063 default: 3064 goto invalid; 3065 } 3066 3067 /* if no change do nothing */ 3068 if (rx->sta->sta.smps_mode == smps_mode) 3069 goto handled; 3070 rx->sta->sta.smps_mode = smps_mode; 3071 sta_opmode.smps_mode = 3072 ieee80211_smps_mode_to_smps_mode(smps_mode); 3073 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; 3074 3075 sband = rx->local->hw.wiphy->bands[status->band]; 3076 3077 rate_control_rate_update(local, sband, rx->sta, 3078 IEEE80211_RC_SMPS_CHANGED); 3079 cfg80211_sta_opmode_change_notify(sdata->dev, 3080 rx->sta->addr, 3081 &sta_opmode, 3082 GFP_ATOMIC); 3083 goto handled; 3084 } 3085 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 3086 struct ieee80211_supported_band *sband; 3087 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 3088 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 3089 struct sta_opmode_info sta_opmode = {}; 3090 3091 /* If it doesn't support 40 MHz it can't change ... */ 3092 if (!(rx->sta->sta.ht_cap.cap & 3093 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 3094 goto handled; 3095 3096 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 3097 max_bw = IEEE80211_STA_RX_BW_20; 3098 else 3099 max_bw = ieee80211_sta_cap_rx_bw(rx->sta); 3100 3101 /* set cur_max_bandwidth and recalc sta bw */ 3102 rx->sta->cur_max_bandwidth = max_bw; 3103 new_bw = ieee80211_sta_cur_vht_bw(rx->sta); 3104 3105 if (rx->sta->sta.bandwidth == new_bw) 3106 goto handled; 3107 3108 rx->sta->sta.bandwidth = new_bw; 3109 sband = rx->local->hw.wiphy->bands[status->band]; 3110 sta_opmode.bw = 3111 ieee80211_sta_rx_bw_to_chan_width(rx->sta); 3112 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; 3113 3114 rate_control_rate_update(local, sband, rx->sta, 3115 IEEE80211_RC_BW_CHANGED); 3116 cfg80211_sta_opmode_change_notify(sdata->dev, 3117 rx->sta->addr, 3118 &sta_opmode, 3119 GFP_ATOMIC); 3120 goto handled; 3121 } 3122 default: 3123 goto invalid; 3124 } 3125 3126 break; 3127 case WLAN_CATEGORY_PUBLIC: 3128 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3129 goto invalid; 3130 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3131 break; 3132 if (!rx->sta) 3133 break; 3134 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) 3135 break; 3136 if (mgmt->u.action.u.ext_chan_switch.action_code != 3137 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 3138 break; 3139 if (len < offsetof(struct ieee80211_mgmt, 3140 u.action.u.ext_chan_switch.variable)) 3141 goto invalid; 3142 goto queue; 3143 case WLAN_CATEGORY_VHT: 3144 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3145 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3146 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3147 sdata->vif.type != NL80211_IFTYPE_AP && 3148 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3149 break; 3150 3151 /* verify action code is present */ 3152 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3153 goto invalid; 3154 3155 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 3156 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 3157 /* verify opmode is present */ 3158 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 3159 goto invalid; 3160 goto queue; 3161 } 3162 case WLAN_VHT_ACTION_GROUPID_MGMT: { 3163 if (len < IEEE80211_MIN_ACTION_SIZE + 25) 3164 goto invalid; 3165 goto queue; 3166 } 3167 default: 3168 break; 3169 } 3170 break; 3171 case WLAN_CATEGORY_BACK: 3172 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3173 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 3174 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 3175 sdata->vif.type != NL80211_IFTYPE_AP && 3176 sdata->vif.type != NL80211_IFTYPE_ADHOC) 3177 break; 3178 3179 /* verify action_code is present */ 3180 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3181 break; 3182 3183 switch (mgmt->u.action.u.addba_req.action_code) { 3184 case WLAN_ACTION_ADDBA_REQ: 3185 if (len < (IEEE80211_MIN_ACTION_SIZE + 3186 sizeof(mgmt->u.action.u.addba_req))) 3187 goto invalid; 3188 break; 3189 case WLAN_ACTION_ADDBA_RESP: 3190 if (len < (IEEE80211_MIN_ACTION_SIZE + 3191 sizeof(mgmt->u.action.u.addba_resp))) 3192 goto invalid; 3193 break; 3194 case WLAN_ACTION_DELBA: 3195 if (len < (IEEE80211_MIN_ACTION_SIZE + 3196 sizeof(mgmt->u.action.u.delba))) 3197 goto invalid; 3198 break; 3199 default: 3200 goto invalid; 3201 } 3202 3203 goto queue; 3204 case WLAN_CATEGORY_SPECTRUM_MGMT: 3205 /* verify action_code is present */ 3206 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 3207 break; 3208 3209 switch (mgmt->u.action.u.measurement.action_code) { 3210 case WLAN_ACTION_SPCT_MSR_REQ: 3211 if (status->band != NL80211_BAND_5GHZ) 3212 break; 3213 3214 if (len < (IEEE80211_MIN_ACTION_SIZE + 3215 sizeof(mgmt->u.action.u.measurement))) 3216 break; 3217 3218 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3219 break; 3220 3221 ieee80211_process_measurement_req(sdata, mgmt, len); 3222 goto handled; 3223 case WLAN_ACTION_SPCT_CHL_SWITCH: { 3224 u8 *bssid; 3225 if (len < (IEEE80211_MIN_ACTION_SIZE + 3226 sizeof(mgmt->u.action.u.chan_switch))) 3227 break; 3228 3229 if (sdata->vif.type != NL80211_IFTYPE_STATION && 3230 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3231 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3232 break; 3233 3234 if (sdata->vif.type == NL80211_IFTYPE_STATION) 3235 bssid = sdata->u.mgd.bssid; 3236 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3237 bssid = sdata->u.ibss.bssid; 3238 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3239 bssid = mgmt->sa; 3240 else 3241 break; 3242 3243 if (!ether_addr_equal(mgmt->bssid, bssid)) 3244 break; 3245 3246 goto queue; 3247 } 3248 } 3249 break; 3250 case WLAN_CATEGORY_SA_QUERY: 3251 if (len < (IEEE80211_MIN_ACTION_SIZE + 3252 sizeof(mgmt->u.action.u.sa_query))) 3253 break; 3254 3255 switch (mgmt->u.action.u.sa_query.action) { 3256 case WLAN_ACTION_SA_QUERY_REQUEST: 3257 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3258 break; 3259 ieee80211_process_sa_query_req(sdata, mgmt, len); 3260 goto handled; 3261 } 3262 break; 3263 case WLAN_CATEGORY_SELF_PROTECTED: 3264 if (len < (IEEE80211_MIN_ACTION_SIZE + 3265 sizeof(mgmt->u.action.u.self_prot.action_code))) 3266 break; 3267 3268 switch (mgmt->u.action.u.self_prot.action_code) { 3269 case WLAN_SP_MESH_PEERING_OPEN: 3270 case WLAN_SP_MESH_PEERING_CLOSE: 3271 case WLAN_SP_MESH_PEERING_CONFIRM: 3272 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3273 goto invalid; 3274 if (sdata->u.mesh.user_mpm) 3275 /* userspace handles this frame */ 3276 break; 3277 goto queue; 3278 case WLAN_SP_MGK_INFORM: 3279 case WLAN_SP_MGK_ACK: 3280 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3281 goto invalid; 3282 break; 3283 } 3284 break; 3285 case WLAN_CATEGORY_MESH_ACTION: 3286 if (len < (IEEE80211_MIN_ACTION_SIZE + 3287 sizeof(mgmt->u.action.u.mesh_action.action_code))) 3288 break; 3289 3290 if (!ieee80211_vif_is_mesh(&sdata->vif)) 3291 break; 3292 if (mesh_action_is_path_sel(mgmt) && 3293 !mesh_path_sel_is_hwmp(sdata)) 3294 break; 3295 goto queue; 3296 } 3297 3298 return RX_CONTINUE; 3299 3300 invalid: 3301 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 3302 /* will return in the next handlers */ 3303 return RX_CONTINUE; 3304 3305 handled: 3306 if (rx->sta) 3307 rx->sta->rx_stats.packets++; 3308 dev_kfree_skb(rx->skb); 3309 return RX_QUEUED; 3310 3311 queue: 3312 skb_queue_tail(&sdata->skb_queue, rx->skb); 3313 ieee80211_queue_work(&local->hw, &sdata->work); 3314 if (rx->sta) 3315 rx->sta->rx_stats.packets++; 3316 return RX_QUEUED; 3317 } 3318 3319 static ieee80211_rx_result debug_noinline 3320 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 3321 { 3322 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3323 int sig = 0; 3324 3325 /* skip known-bad action frames and return them in the next handler */ 3326 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 3327 return RX_CONTINUE; 3328 3329 /* 3330 * Getting here means the kernel doesn't know how to handle 3331 * it, but maybe userspace does ... include returned frames 3332 * so userspace can register for those to know whether ones 3333 * it transmitted were processed or returned. 3334 */ 3335 3336 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && 3337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) 3338 sig = status->signal; 3339 3340 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig, 3341 rx->skb->data, rx->skb->len, 0)) { 3342 if (rx->sta) 3343 rx->sta->rx_stats.packets++; 3344 dev_kfree_skb(rx->skb); 3345 return RX_QUEUED; 3346 } 3347 3348 return RX_CONTINUE; 3349 } 3350 3351 static ieee80211_rx_result debug_noinline 3352 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 3353 { 3354 struct ieee80211_local *local = rx->local; 3355 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 3356 struct sk_buff *nskb; 3357 struct ieee80211_sub_if_data *sdata = rx->sdata; 3358 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 3359 3360 if (!ieee80211_is_action(mgmt->frame_control)) 3361 return RX_CONTINUE; 3362 3363 /* 3364 * For AP mode, hostapd is responsible for handling any action 3365 * frames that we didn't handle, including returning unknown 3366 * ones. For all other modes we will return them to the sender, 3367 * setting the 0x80 bit in the action category, as required by 3368 * 802.11-2012 9.24.4. 3369 * Newer versions of hostapd shall also use the management frame 3370 * registration mechanisms, but older ones still use cooked 3371 * monitor interfaces so push all frames there. 3372 */ 3373 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 3374 (sdata->vif.type == NL80211_IFTYPE_AP || 3375 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 3376 return RX_DROP_MONITOR; 3377 3378 if (is_multicast_ether_addr(mgmt->da)) 3379 return RX_DROP_MONITOR; 3380 3381 /* do not return rejected action frames */ 3382 if (mgmt->u.action.category & 0x80) 3383 return RX_DROP_UNUSABLE; 3384 3385 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 3386 GFP_ATOMIC); 3387 if (nskb) { 3388 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 3389 3390 nmgmt->u.action.category |= 0x80; 3391 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 3392 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 3393 3394 memset(nskb->cb, 0, sizeof(nskb->cb)); 3395 3396 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 3397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 3398 3399 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 3400 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 3401 IEEE80211_TX_CTL_NO_CCK_RATE; 3402 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 3403 info->hw_queue = 3404 local->hw.offchannel_tx_hw_queue; 3405 } 3406 3407 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, 3408 status->band, 0); 3409 } 3410 dev_kfree_skb(rx->skb); 3411 return RX_QUEUED; 3412 } 3413 3414 static ieee80211_rx_result debug_noinline 3415 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 3416 { 3417 struct ieee80211_sub_if_data *sdata = rx->sdata; 3418 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 3419 __le16 stype; 3420 3421 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 3422 3423 if (!ieee80211_vif_is_mesh(&sdata->vif) && 3424 sdata->vif.type != NL80211_IFTYPE_ADHOC && 3425 sdata->vif.type != NL80211_IFTYPE_OCB && 3426 sdata->vif.type != NL80211_IFTYPE_STATION) 3427 return RX_DROP_MONITOR; 3428 3429 switch (stype) { 3430 case cpu_to_le16(IEEE80211_STYPE_AUTH): 3431 case cpu_to_le16(IEEE80211_STYPE_BEACON): 3432 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 3433 /* process for all: mesh, mlme, ibss */ 3434 break; 3435 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 3436 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 3437 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 3438 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 3439 if (is_multicast_ether_addr(mgmt->da) && 3440 !is_broadcast_ether_addr(mgmt->da)) 3441 return RX_DROP_MONITOR; 3442 3443 /* process only for station */ 3444 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3445 return RX_DROP_MONITOR; 3446 break; 3447 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 3448 /* process only for ibss and mesh */ 3449 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 3450 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3451 return RX_DROP_MONITOR; 3452 break; 3453 default: 3454 return RX_DROP_MONITOR; 3455 } 3456 3457 /* queue up frame and kick off work to process it */ 3458 skb_queue_tail(&sdata->skb_queue, rx->skb); 3459 ieee80211_queue_work(&rx->local->hw, &sdata->work); 3460 if (rx->sta) 3461 rx->sta->rx_stats.packets++; 3462 3463 return RX_QUEUED; 3464 } 3465 3466 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 3467 struct ieee80211_rate *rate) 3468 { 3469 struct ieee80211_sub_if_data *sdata; 3470 struct ieee80211_local *local = rx->local; 3471 struct sk_buff *skb = rx->skb, *skb2; 3472 struct net_device *prev_dev = NULL; 3473 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3474 int needed_headroom; 3475 3476 /* 3477 * If cooked monitor has been processed already, then 3478 * don't do it again. If not, set the flag. 3479 */ 3480 if (rx->flags & IEEE80211_RX_CMNTR) 3481 goto out_free_skb; 3482 rx->flags |= IEEE80211_RX_CMNTR; 3483 3484 /* If there are no cooked monitor interfaces, just free the SKB */ 3485 if (!local->cooked_mntrs) 3486 goto out_free_skb; 3487 3488 /* vendor data is long removed here */ 3489 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA; 3490 /* room for the radiotap header based on driver features */ 3491 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb); 3492 3493 if (skb_headroom(skb) < needed_headroom && 3494 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) 3495 goto out_free_skb; 3496 3497 /* prepend radiotap information */ 3498 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 3499 false); 3500 3501 skb_reset_mac_header(skb); 3502 skb->ip_summed = CHECKSUM_UNNECESSARY; 3503 skb->pkt_type = PACKET_OTHERHOST; 3504 skb->protocol = htons(ETH_P_802_2); 3505 3506 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3507 if (!ieee80211_sdata_running(sdata)) 3508 continue; 3509 3510 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 3511 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)) 3512 continue; 3513 3514 if (prev_dev) { 3515 skb2 = skb_clone(skb, GFP_ATOMIC); 3516 if (skb2) { 3517 skb2->dev = prev_dev; 3518 netif_receive_skb(skb2); 3519 } 3520 } 3521 3522 prev_dev = sdata->dev; 3523 ieee80211_rx_stats(sdata->dev, skb->len); 3524 } 3525 3526 if (prev_dev) { 3527 skb->dev = prev_dev; 3528 netif_receive_skb(skb); 3529 return; 3530 } 3531 3532 out_free_skb: 3533 dev_kfree_skb(skb); 3534 } 3535 3536 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 3537 ieee80211_rx_result res) 3538 { 3539 switch (res) { 3540 case RX_DROP_MONITOR: 3541 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3542 if (rx->sta) 3543 rx->sta->rx_stats.dropped++; 3544 /* fall through */ 3545 case RX_CONTINUE: { 3546 struct ieee80211_rate *rate = NULL; 3547 struct ieee80211_supported_band *sband; 3548 struct ieee80211_rx_status *status; 3549 3550 status = IEEE80211_SKB_RXCB((rx->skb)); 3551 3552 sband = rx->local->hw.wiphy->bands[status->band]; 3553 if (status->encoding == RX_ENC_LEGACY) 3554 rate = &sband->bitrates[status->rate_idx]; 3555 3556 ieee80211_rx_cooked_monitor(rx, rate); 3557 break; 3558 } 3559 case RX_DROP_UNUSABLE: 3560 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3561 if (rx->sta) 3562 rx->sta->rx_stats.dropped++; 3563 dev_kfree_skb(rx->skb); 3564 break; 3565 case RX_QUEUED: 3566 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 3567 break; 3568 } 3569 } 3570 3571 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 3572 struct sk_buff_head *frames) 3573 { 3574 ieee80211_rx_result res = RX_DROP_MONITOR; 3575 struct sk_buff *skb; 3576 3577 #define CALL_RXH(rxh) \ 3578 do { \ 3579 res = rxh(rx); \ 3580 if (res != RX_CONTINUE) \ 3581 goto rxh_next; \ 3582 } while (0) 3583 3584 /* Lock here to avoid hitting all of the data used in the RX 3585 * path (e.g. key data, station data, ...) concurrently when 3586 * a frame is released from the reorder buffer due to timeout 3587 * from the timer, potentially concurrently with RX from the 3588 * driver. 3589 */ 3590 spin_lock_bh(&rx->local->rx_path_lock); 3591 3592 while ((skb = __skb_dequeue(frames))) { 3593 /* 3594 * all the other fields are valid across frames 3595 * that belong to an aMPDU since they are on the 3596 * same TID from the same station 3597 */ 3598 rx->skb = skb; 3599 3600 CALL_RXH(ieee80211_rx_h_check_more_data); 3601 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); 3602 CALL_RXH(ieee80211_rx_h_sta_process); 3603 CALL_RXH(ieee80211_rx_h_decrypt); 3604 CALL_RXH(ieee80211_rx_h_defragment); 3605 CALL_RXH(ieee80211_rx_h_michael_mic_verify); 3606 /* must be after MMIC verify so header is counted in MPDU mic */ 3607 #ifdef CONFIG_MAC80211_MESH 3608 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 3609 CALL_RXH(ieee80211_rx_h_mesh_fwding); 3610 #endif 3611 CALL_RXH(ieee80211_rx_h_amsdu); 3612 CALL_RXH(ieee80211_rx_h_data); 3613 3614 /* special treatment -- needs the queue */ 3615 res = ieee80211_rx_h_ctrl(rx, frames); 3616 if (res != RX_CONTINUE) 3617 goto rxh_next; 3618 3619 CALL_RXH(ieee80211_rx_h_mgmt_check); 3620 CALL_RXH(ieee80211_rx_h_action); 3621 CALL_RXH(ieee80211_rx_h_userspace_mgmt); 3622 CALL_RXH(ieee80211_rx_h_action_return); 3623 CALL_RXH(ieee80211_rx_h_mgmt); 3624 3625 rxh_next: 3626 ieee80211_rx_handlers_result(rx, res); 3627 3628 #undef CALL_RXH 3629 } 3630 3631 spin_unlock_bh(&rx->local->rx_path_lock); 3632 } 3633 3634 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 3635 { 3636 struct sk_buff_head reorder_release; 3637 ieee80211_rx_result res = RX_DROP_MONITOR; 3638 3639 __skb_queue_head_init(&reorder_release); 3640 3641 #define CALL_RXH(rxh) \ 3642 do { \ 3643 res = rxh(rx); \ 3644 if (res != RX_CONTINUE) \ 3645 goto rxh_next; \ 3646 } while (0) 3647 3648 CALL_RXH(ieee80211_rx_h_check_dup); 3649 CALL_RXH(ieee80211_rx_h_check); 3650 3651 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 3652 3653 ieee80211_rx_handlers(rx, &reorder_release); 3654 return; 3655 3656 rxh_next: 3657 ieee80211_rx_handlers_result(rx, res); 3658 3659 #undef CALL_RXH 3660 } 3661 3662 /* 3663 * This function makes calls into the RX path, therefore 3664 * it has to be invoked under RCU read lock. 3665 */ 3666 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 3667 { 3668 struct sk_buff_head frames; 3669 struct ieee80211_rx_data rx = { 3670 .sta = sta, 3671 .sdata = sta->sdata, 3672 .local = sta->local, 3673 /* This is OK -- must be QoS data frame */ 3674 .security_idx = tid, 3675 .seqno_idx = tid, 3676 .napi = NULL, /* must be NULL to not have races */ 3677 }; 3678 struct tid_ampdu_rx *tid_agg_rx; 3679 3680 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3681 if (!tid_agg_rx) 3682 return; 3683 3684 __skb_queue_head_init(&frames); 3685 3686 spin_lock(&tid_agg_rx->reorder_lock); 3687 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 3688 spin_unlock(&tid_agg_rx->reorder_lock); 3689 3690 if (!skb_queue_empty(&frames)) { 3691 struct ieee80211_event event = { 3692 .type = BA_FRAME_TIMEOUT, 3693 .u.ba.tid = tid, 3694 .u.ba.sta = &sta->sta, 3695 }; 3696 drv_event_callback(rx.local, rx.sdata, &event); 3697 } 3698 3699 ieee80211_rx_handlers(&rx, &frames); 3700 } 3701 3702 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, 3703 u16 ssn, u64 filtered, 3704 u16 received_mpdus) 3705 { 3706 struct sta_info *sta; 3707 struct tid_ampdu_rx *tid_agg_rx; 3708 struct sk_buff_head frames; 3709 struct ieee80211_rx_data rx = { 3710 /* This is OK -- must be QoS data frame */ 3711 .security_idx = tid, 3712 .seqno_idx = tid, 3713 }; 3714 int i, diff; 3715 3716 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) 3717 return; 3718 3719 __skb_queue_head_init(&frames); 3720 3721 sta = container_of(pubsta, struct sta_info, sta); 3722 3723 rx.sta = sta; 3724 rx.sdata = sta->sdata; 3725 rx.local = sta->local; 3726 3727 rcu_read_lock(); 3728 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3729 if (!tid_agg_rx) 3730 goto out; 3731 3732 spin_lock_bh(&tid_agg_rx->reorder_lock); 3733 3734 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { 3735 int release; 3736 3737 /* release all frames in the reorder buffer */ 3738 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % 3739 IEEE80211_SN_MODULO; 3740 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, 3741 release, &frames); 3742 /* update ssn to match received ssn */ 3743 tid_agg_rx->head_seq_num = ssn; 3744 } else { 3745 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, 3746 &frames); 3747 } 3748 3749 /* handle the case that received ssn is behind the mac ssn. 3750 * it can be tid_agg_rx->buf_size behind and still be valid */ 3751 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; 3752 if (diff >= tid_agg_rx->buf_size) { 3753 tid_agg_rx->reorder_buf_filtered = 0; 3754 goto release; 3755 } 3756 filtered = filtered >> diff; 3757 ssn += diff; 3758 3759 /* update bitmap */ 3760 for (i = 0; i < tid_agg_rx->buf_size; i++) { 3761 int index = (ssn + i) % tid_agg_rx->buf_size; 3762 3763 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); 3764 if (filtered & BIT_ULL(i)) 3765 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); 3766 } 3767 3768 /* now process also frames that the filter marking released */ 3769 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 3770 3771 release: 3772 spin_unlock_bh(&tid_agg_rx->reorder_lock); 3773 3774 ieee80211_rx_handlers(&rx, &frames); 3775 3776 out: 3777 rcu_read_unlock(); 3778 } 3779 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); 3780 3781 /* main receive path */ 3782 3783 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 3784 { 3785 struct ieee80211_sub_if_data *sdata = rx->sdata; 3786 struct sk_buff *skb = rx->skb; 3787 struct ieee80211_hdr *hdr = (void *)skb->data; 3788 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3789 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 3790 bool multicast = is_multicast_ether_addr(hdr->addr1); 3791 3792 switch (sdata->vif.type) { 3793 case NL80211_IFTYPE_STATION: 3794 if (!bssid && !sdata->u.mgd.use_4addr) 3795 return false; 3796 if (multicast) 3797 return true; 3798 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3799 case NL80211_IFTYPE_ADHOC: 3800 if (!bssid) 3801 return false; 3802 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 3803 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) 3804 return false; 3805 if (ieee80211_is_beacon(hdr->frame_control)) 3806 return true; 3807 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 3808 return false; 3809 if (!multicast && 3810 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3811 return false; 3812 if (!rx->sta) { 3813 int rate_idx; 3814 if (status->encoding != RX_ENC_LEGACY) 3815 rate_idx = 0; /* TODO: HT/VHT rates */ 3816 else 3817 rate_idx = status->rate_idx; 3818 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 3819 BIT(rate_idx)); 3820 } 3821 return true; 3822 case NL80211_IFTYPE_OCB: 3823 if (!bssid) 3824 return false; 3825 if (!ieee80211_is_data_present(hdr->frame_control)) 3826 return false; 3827 if (!is_broadcast_ether_addr(bssid)) 3828 return false; 3829 if (!multicast && 3830 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 3831 return false; 3832 if (!rx->sta) { 3833 int rate_idx; 3834 if (status->encoding != RX_ENC_LEGACY) 3835 rate_idx = 0; /* TODO: HT rates */ 3836 else 3837 rate_idx = status->rate_idx; 3838 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 3839 BIT(rate_idx)); 3840 } 3841 return true; 3842 case NL80211_IFTYPE_MESH_POINT: 3843 if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) 3844 return false; 3845 if (multicast) 3846 return true; 3847 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3848 case NL80211_IFTYPE_AP_VLAN: 3849 case NL80211_IFTYPE_AP: 3850 if (!bssid) 3851 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3852 3853 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { 3854 /* 3855 * Accept public action frames even when the 3856 * BSSID doesn't match, this is used for P2P 3857 * and location updates. Note that mac80211 3858 * itself never looks at these frames. 3859 */ 3860 if (!multicast && 3861 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3862 return false; 3863 if (ieee80211_is_public_action(hdr, skb->len)) 3864 return true; 3865 return ieee80211_is_beacon(hdr->frame_control); 3866 } 3867 3868 if (!ieee80211_has_tods(hdr->frame_control)) { 3869 /* ignore data frames to TDLS-peers */ 3870 if (ieee80211_is_data(hdr->frame_control)) 3871 return false; 3872 /* ignore action frames to TDLS-peers */ 3873 if (ieee80211_is_action(hdr->frame_control) && 3874 !is_broadcast_ether_addr(bssid) && 3875 !ether_addr_equal(bssid, hdr->addr1)) 3876 return false; 3877 } 3878 3879 /* 3880 * 802.11-2016 Table 9-26 says that for data frames, A1 must be 3881 * the BSSID - we've checked that already but may have accepted 3882 * the wildcard (ff:ff:ff:ff:ff:ff). 3883 * 3884 * It also says: 3885 * The BSSID of the Data frame is determined as follows: 3886 * a) If the STA is contained within an AP or is associated 3887 * with an AP, the BSSID is the address currently in use 3888 * by the STA contained in the AP. 3889 * 3890 * So we should not accept data frames with an address that's 3891 * multicast. 3892 * 3893 * Accepting it also opens a security problem because stations 3894 * could encrypt it with the GTK and inject traffic that way. 3895 */ 3896 if (ieee80211_is_data(hdr->frame_control) && multicast) 3897 return false; 3898 3899 return true; 3900 case NL80211_IFTYPE_WDS: 3901 if (bssid || !ieee80211_is_data(hdr->frame_control)) 3902 return false; 3903 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2); 3904 case NL80211_IFTYPE_P2P_DEVICE: 3905 return ieee80211_is_public_action(hdr, skb->len) || 3906 ieee80211_is_probe_req(hdr->frame_control) || 3907 ieee80211_is_probe_resp(hdr->frame_control) || 3908 ieee80211_is_beacon(hdr->frame_control); 3909 case NL80211_IFTYPE_NAN: 3910 /* Currently no frames on NAN interface are allowed */ 3911 return false; 3912 default: 3913 break; 3914 } 3915 3916 WARN_ON_ONCE(1); 3917 return false; 3918 } 3919 3920 void ieee80211_check_fast_rx(struct sta_info *sta) 3921 { 3922 struct ieee80211_sub_if_data *sdata = sta->sdata; 3923 struct ieee80211_local *local = sdata->local; 3924 struct ieee80211_key *key; 3925 struct ieee80211_fast_rx fastrx = { 3926 .dev = sdata->dev, 3927 .vif_type = sdata->vif.type, 3928 .control_port_protocol = sdata->control_port_protocol, 3929 }, *old, *new = NULL; 3930 bool assign = false; 3931 3932 /* use sparse to check that we don't return without updating */ 3933 __acquire(check_fast_rx); 3934 3935 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); 3936 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); 3937 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); 3938 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); 3939 3940 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); 3941 3942 /* fast-rx doesn't do reordering */ 3943 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 3944 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) 3945 goto clear; 3946 3947 switch (sdata->vif.type) { 3948 case NL80211_IFTYPE_STATION: 3949 if (sta->sta.tdls) { 3950 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 3951 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3952 fastrx.expected_ds_bits = 0; 3953 } else { 3954 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0; 3955 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); 3956 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3957 fastrx.expected_ds_bits = 3958 cpu_to_le16(IEEE80211_FCTL_FROMDS); 3959 } 3960 3961 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { 3962 fastrx.expected_ds_bits |= 3963 cpu_to_le16(IEEE80211_FCTL_TODS); 3964 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 3965 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3966 } 3967 3968 if (!sdata->u.mgd.powersave) 3969 break; 3970 3971 /* software powersave is a huge mess, avoid all of it */ 3972 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 3973 goto clear; 3974 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3975 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 3976 goto clear; 3977 break; 3978 case NL80211_IFTYPE_AP_VLAN: 3979 case NL80211_IFTYPE_AP: 3980 /* parallel-rx requires this, at least with calls to 3981 * ieee80211_sta_ps_transition() 3982 */ 3983 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 3984 goto clear; 3985 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); 3986 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3987 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); 3988 3989 fastrx.internal_forward = 3990 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 3991 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || 3992 !sdata->u.vlan.sta); 3993 3994 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 3995 sdata->u.vlan.sta) { 3996 fastrx.expected_ds_bits |= 3997 cpu_to_le16(IEEE80211_FCTL_FROMDS); 3998 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3999 fastrx.internal_forward = 0; 4000 } 4001 4002 break; 4003 default: 4004 goto clear; 4005 } 4006 4007 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 4008 goto clear; 4009 4010 rcu_read_lock(); 4011 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4012 if (key) { 4013 switch (key->conf.cipher) { 4014 case WLAN_CIPHER_SUITE_TKIP: 4015 /* we don't want to deal with MMIC in fast-rx */ 4016 goto clear_rcu; 4017 case WLAN_CIPHER_SUITE_CCMP: 4018 case WLAN_CIPHER_SUITE_CCMP_256: 4019 case WLAN_CIPHER_SUITE_GCMP: 4020 case WLAN_CIPHER_SUITE_GCMP_256: 4021 break; 4022 default: 4023 /* we also don't want to deal with WEP or cipher scheme 4024 * since those require looking up the key idx in the 4025 * frame, rather than assuming the PTK is used 4026 * (we need to revisit this once we implement the real 4027 * PTK index, which is now valid in the spec, but we 4028 * haven't implemented that part yet) 4029 */ 4030 goto clear_rcu; 4031 } 4032 4033 fastrx.key = true; 4034 fastrx.icv_len = key->conf.icv_len; 4035 } 4036 4037 assign = true; 4038 clear_rcu: 4039 rcu_read_unlock(); 4040 clear: 4041 __release(check_fast_rx); 4042 4043 if (assign) 4044 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); 4045 4046 spin_lock_bh(&sta->lock); 4047 old = rcu_dereference_protected(sta->fast_rx, true); 4048 rcu_assign_pointer(sta->fast_rx, new); 4049 spin_unlock_bh(&sta->lock); 4050 4051 if (old) 4052 kfree_rcu(old, rcu_head); 4053 } 4054 4055 void ieee80211_clear_fast_rx(struct sta_info *sta) 4056 { 4057 struct ieee80211_fast_rx *old; 4058 4059 spin_lock_bh(&sta->lock); 4060 old = rcu_dereference_protected(sta->fast_rx, true); 4061 RCU_INIT_POINTER(sta->fast_rx, NULL); 4062 spin_unlock_bh(&sta->lock); 4063 4064 if (old) 4065 kfree_rcu(old, rcu_head); 4066 } 4067 4068 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4069 { 4070 struct ieee80211_local *local = sdata->local; 4071 struct sta_info *sta; 4072 4073 lockdep_assert_held(&local->sta_mtx); 4074 4075 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4076 if (sdata != sta->sdata && 4077 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 4078 continue; 4079 ieee80211_check_fast_rx(sta); 4080 } 4081 } 4082 4083 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) 4084 { 4085 struct ieee80211_local *local = sdata->local; 4086 4087 mutex_lock(&local->sta_mtx); 4088 __ieee80211_check_fast_rx_iface(sdata); 4089 mutex_unlock(&local->sta_mtx); 4090 } 4091 4092 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, 4093 struct ieee80211_fast_rx *fast_rx) 4094 { 4095 struct sk_buff *skb = rx->skb; 4096 struct ieee80211_hdr *hdr = (void *)skb->data; 4097 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4098 struct sta_info *sta = rx->sta; 4099 int orig_len = skb->len; 4100 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 4101 int snap_offs = hdrlen; 4102 struct { 4103 u8 snap[sizeof(rfc1042_header)]; 4104 __be16 proto; 4105 } *payload __aligned(2); 4106 struct { 4107 u8 da[ETH_ALEN]; 4108 u8 sa[ETH_ALEN]; 4109 } addrs __aligned(2); 4110 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats; 4111 4112 if (fast_rx->uses_rss) 4113 stats = this_cpu_ptr(sta->pcpu_rx_stats); 4114 4115 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write 4116 * to a common data structure; drivers can implement that per queue 4117 * but we don't have that information in mac80211 4118 */ 4119 if (!(status->flag & RX_FLAG_DUP_VALIDATED)) 4120 return false; 4121 4122 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) 4123 4124 /* If using encryption, we also need to have: 4125 * - PN_VALIDATED: similar, but the implementation is tricky 4126 * - DECRYPTED: necessary for PN_VALIDATED 4127 */ 4128 if (fast_rx->key && 4129 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) 4130 return false; 4131 4132 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 4133 return false; 4134 4135 if (unlikely(ieee80211_is_frag(hdr))) 4136 return false; 4137 4138 /* Since our interface address cannot be multicast, this 4139 * implicitly also rejects multicast frames without the 4140 * explicit check. 4141 * 4142 * We shouldn't get any *data* frames not addressed to us 4143 * (AP mode will accept multicast *management* frames), but 4144 * punting here will make it go through the full checks in 4145 * ieee80211_accept_frame(). 4146 */ 4147 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) 4148 return false; 4149 4150 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | 4151 IEEE80211_FCTL_TODS)) != 4152 fast_rx->expected_ds_bits) 4153 return false; 4154 4155 /* assign the key to drop unencrypted frames (later) 4156 * and strip the IV/MIC if necessary 4157 */ 4158 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { 4159 /* GCMP header length is the same */ 4160 snap_offs += IEEE80211_CCMP_HDR_LEN; 4161 } 4162 4163 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) { 4164 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) 4165 goto drop; 4166 4167 payload = (void *)(skb->data + snap_offs); 4168 4169 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) 4170 return false; 4171 4172 /* Don't handle these here since they require special code. 4173 * Accept AARP and IPX even though they should come with a 4174 * bridge-tunnel header - but if we get them this way then 4175 * there's little point in discarding them. 4176 */ 4177 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || 4178 payload->proto == fast_rx->control_port_protocol)) 4179 return false; 4180 } 4181 4182 /* after this point, don't punt to the slowpath! */ 4183 4184 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && 4185 pskb_trim(skb, skb->len - fast_rx->icv_len)) 4186 goto drop; 4187 4188 if (unlikely(fast_rx->sta_notify)) { 4189 ieee80211_sta_rx_notify(rx->sdata, hdr); 4190 fast_rx->sta_notify = false; 4191 } 4192 4193 /* statistics part of ieee80211_rx_h_sta_process() */ 4194 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 4195 stats->last_signal = status->signal; 4196 if (!fast_rx->uses_rss) 4197 ewma_signal_add(&sta->rx_stats_avg.signal, 4198 -status->signal); 4199 } 4200 4201 if (status->chains) { 4202 int i; 4203 4204 stats->chains = status->chains; 4205 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 4206 int signal = status->chain_signal[i]; 4207 4208 if (!(status->chains & BIT(i))) 4209 continue; 4210 4211 stats->chain_signal_last[i] = signal; 4212 if (!fast_rx->uses_rss) 4213 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], 4214 -signal); 4215 } 4216 } 4217 /* end of statistics */ 4218 4219 if (rx->key && !ieee80211_has_protected(hdr->frame_control)) 4220 goto drop; 4221 4222 if (status->rx_flags & IEEE80211_RX_AMSDU) { 4223 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != 4224 RX_QUEUED) 4225 goto drop; 4226 4227 return true; 4228 } 4229 4230 stats->last_rx = jiffies; 4231 stats->last_rate = sta_stats_encode_rate(status); 4232 4233 stats->fragments++; 4234 stats->packets++; 4235 4236 /* do the header conversion - first grab the addresses */ 4237 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); 4238 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); 4239 /* remove the SNAP but leave the ethertype */ 4240 skb_pull(skb, snap_offs + sizeof(rfc1042_header)); 4241 /* push the addresses in front */ 4242 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); 4243 4244 skb->dev = fast_rx->dev; 4245 4246 ieee80211_rx_stats(fast_rx->dev, skb->len); 4247 4248 /* The seqno index has the same property as needed 4249 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 4250 * for non-QoS-data frames. Here we know it's a data 4251 * frame, so count MSDUs. 4252 */ 4253 u64_stats_update_begin(&stats->syncp); 4254 stats->msdu[rx->seqno_idx]++; 4255 stats->bytes += orig_len; 4256 u64_stats_update_end(&stats->syncp); 4257 4258 if (fast_rx->internal_forward) { 4259 struct sk_buff *xmit_skb = NULL; 4260 if (is_multicast_ether_addr(addrs.da)) { 4261 xmit_skb = skb_copy(skb, GFP_ATOMIC); 4262 } else if (!ether_addr_equal(addrs.da, addrs.sa) && 4263 sta_info_get(rx->sdata, addrs.da)) { 4264 xmit_skb = skb; 4265 skb = NULL; 4266 } 4267 4268 if (xmit_skb) { 4269 /* 4270 * Send to wireless media and increase priority by 256 4271 * to keep the received priority instead of 4272 * reclassifying the frame (see cfg80211_classify8021d). 4273 */ 4274 xmit_skb->priority += 256; 4275 xmit_skb->protocol = htons(ETH_P_802_3); 4276 skb_reset_network_header(xmit_skb); 4277 skb_reset_mac_header(xmit_skb); 4278 dev_queue_xmit(xmit_skb); 4279 } 4280 4281 if (!skb) 4282 return true; 4283 } 4284 4285 /* deliver to local stack */ 4286 skb->protocol = eth_type_trans(skb, fast_rx->dev); 4287 memset(skb->cb, 0, sizeof(skb->cb)); 4288 if (rx->napi) 4289 napi_gro_receive(rx->napi, skb); 4290 else 4291 netif_receive_skb(skb); 4292 4293 return true; 4294 drop: 4295 dev_kfree_skb(skb); 4296 stats->dropped++; 4297 return true; 4298 } 4299 4300 /* 4301 * This function returns whether or not the SKB 4302 * was destined for RX processing or not, which, 4303 * if consume is true, is equivalent to whether 4304 * or not the skb was consumed. 4305 */ 4306 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 4307 struct sk_buff *skb, bool consume) 4308 { 4309 struct ieee80211_local *local = rx->local; 4310 struct ieee80211_sub_if_data *sdata = rx->sdata; 4311 4312 rx->skb = skb; 4313 4314 /* See if we can do fast-rx; if we have to copy we already lost, 4315 * so punt in that case. We should never have to deliver a data 4316 * frame to multiple interfaces anyway. 4317 * 4318 * We skip the ieee80211_accept_frame() call and do the necessary 4319 * checking inside ieee80211_invoke_fast_rx(). 4320 */ 4321 if (consume && rx->sta) { 4322 struct ieee80211_fast_rx *fast_rx; 4323 4324 fast_rx = rcu_dereference(rx->sta->fast_rx); 4325 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) 4326 return true; 4327 } 4328 4329 if (!ieee80211_accept_frame(rx)) 4330 return false; 4331 4332 if (!consume) { 4333 skb = skb_copy(skb, GFP_ATOMIC); 4334 if (!skb) { 4335 if (net_ratelimit()) 4336 wiphy_debug(local->hw.wiphy, 4337 "failed to copy skb for %s\n", 4338 sdata->name); 4339 return true; 4340 } 4341 4342 rx->skb = skb; 4343 } 4344 4345 ieee80211_invoke_rx_handlers(rx); 4346 return true; 4347 } 4348 4349 /* 4350 * This is the actual Rx frames handler. as it belongs to Rx path it must 4351 * be called with rcu_read_lock protection. 4352 */ 4353 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 4354 struct ieee80211_sta *pubsta, 4355 struct sk_buff *skb, 4356 struct napi_struct *napi) 4357 { 4358 struct ieee80211_local *local = hw_to_local(hw); 4359 struct ieee80211_sub_if_data *sdata; 4360 struct ieee80211_hdr *hdr; 4361 __le16 fc; 4362 struct ieee80211_rx_data rx; 4363 struct ieee80211_sub_if_data *prev; 4364 struct rhlist_head *tmp; 4365 int err = 0; 4366 4367 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 4368 memset(&rx, 0, sizeof(rx)); 4369 rx.skb = skb; 4370 rx.local = local; 4371 rx.napi = napi; 4372 4373 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 4374 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 4375 4376 if (ieee80211_is_mgmt(fc)) { 4377 /* drop frame if too short for header */ 4378 if (skb->len < ieee80211_hdrlen(fc)) 4379 err = -ENOBUFS; 4380 else 4381 err = skb_linearize(skb); 4382 } else { 4383 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 4384 } 4385 4386 if (err) { 4387 dev_kfree_skb(skb); 4388 return; 4389 } 4390 4391 hdr = (struct ieee80211_hdr *)skb->data; 4392 ieee80211_parse_qos(&rx); 4393 ieee80211_verify_alignment(&rx); 4394 4395 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 4396 ieee80211_is_beacon(hdr->frame_control))) 4397 ieee80211_scan_rx(local, skb); 4398 4399 if (ieee80211_is_data(fc)) { 4400 struct sta_info *sta, *prev_sta; 4401 4402 if (pubsta) { 4403 rx.sta = container_of(pubsta, struct sta_info, sta); 4404 rx.sdata = rx.sta->sdata; 4405 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4406 return; 4407 goto out; 4408 } 4409 4410 prev_sta = NULL; 4411 4412 for_each_sta_info(local, hdr->addr2, sta, tmp) { 4413 if (!prev_sta) { 4414 prev_sta = sta; 4415 continue; 4416 } 4417 4418 rx.sta = prev_sta; 4419 rx.sdata = prev_sta->sdata; 4420 ieee80211_prepare_and_rx_handle(&rx, skb, false); 4421 4422 prev_sta = sta; 4423 } 4424 4425 if (prev_sta) { 4426 rx.sta = prev_sta; 4427 rx.sdata = prev_sta->sdata; 4428 4429 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4430 return; 4431 goto out; 4432 } 4433 } 4434 4435 prev = NULL; 4436 4437 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4438 if (!ieee80211_sdata_running(sdata)) 4439 continue; 4440 4441 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 4442 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4443 continue; 4444 4445 /* 4446 * frame is destined for this interface, but if it's 4447 * not also for the previous one we handle that after 4448 * the loop to avoid copying the SKB once too much 4449 */ 4450 4451 if (!prev) { 4452 prev = sdata; 4453 continue; 4454 } 4455 4456 rx.sta = sta_info_get_bss(prev, hdr->addr2); 4457 rx.sdata = prev; 4458 ieee80211_prepare_and_rx_handle(&rx, skb, false); 4459 4460 prev = sdata; 4461 } 4462 4463 if (prev) { 4464 rx.sta = sta_info_get_bss(prev, hdr->addr2); 4465 rx.sdata = prev; 4466 4467 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 4468 return; 4469 } 4470 4471 out: 4472 dev_kfree_skb(skb); 4473 } 4474 4475 /* 4476 * This is the receive path handler. It is called by a low level driver when an 4477 * 802.11 MPDU is received from the hardware. 4478 */ 4479 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, 4480 struct sk_buff *skb, struct napi_struct *napi) 4481 { 4482 struct ieee80211_local *local = hw_to_local(hw); 4483 struct ieee80211_rate *rate = NULL; 4484 struct ieee80211_supported_band *sband; 4485 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 4486 4487 WARN_ON_ONCE(softirq_count() == 0); 4488 4489 if (WARN_ON(status->band >= NUM_NL80211_BANDS)) 4490 goto drop; 4491 4492 sband = local->hw.wiphy->bands[status->band]; 4493 if (WARN_ON(!sband)) 4494 goto drop; 4495 4496 /* 4497 * If we're suspending, it is possible although not too likely 4498 * that we'd be receiving frames after having already partially 4499 * quiesced the stack. We can't process such frames then since 4500 * that might, for example, cause stations to be added or other 4501 * driver callbacks be invoked. 4502 */ 4503 if (unlikely(local->quiescing || local->suspended)) 4504 goto drop; 4505 4506 /* We might be during a HW reconfig, prevent Rx for the same reason */ 4507 if (unlikely(local->in_reconfig)) 4508 goto drop; 4509 4510 /* 4511 * The same happens when we're not even started, 4512 * but that's worth a warning. 4513 */ 4514 if (WARN_ON(!local->started)) 4515 goto drop; 4516 4517 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 4518 /* 4519 * Validate the rate, unless a PLCP error means that 4520 * we probably can't have a valid rate here anyway. 4521 */ 4522 4523 switch (status->encoding) { 4524 case RX_ENC_HT: 4525 /* 4526 * rate_idx is MCS index, which can be [0-76] 4527 * as documented on: 4528 * 4529 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 4530 * 4531 * Anything else would be some sort of driver or 4532 * hardware error. The driver should catch hardware 4533 * errors. 4534 */ 4535 if (WARN(status->rate_idx > 76, 4536 "Rate marked as an HT rate but passed " 4537 "status->rate_idx is not " 4538 "an MCS index [0-76]: %d (0x%02x)\n", 4539 status->rate_idx, 4540 status->rate_idx)) 4541 goto drop; 4542 break; 4543 case RX_ENC_VHT: 4544 if (WARN_ONCE(status->rate_idx > 9 || 4545 !status->nss || 4546 status->nss > 8, 4547 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 4548 status->rate_idx, status->nss)) 4549 goto drop; 4550 break; 4551 case RX_ENC_HE: 4552 if (WARN_ONCE(status->rate_idx > 11 || 4553 !status->nss || 4554 status->nss > 8, 4555 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", 4556 status->rate_idx, status->nss)) 4557 goto drop; 4558 break; 4559 default: 4560 WARN_ON_ONCE(1); 4561 /* fall through */ 4562 case RX_ENC_LEGACY: 4563 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 4564 goto drop; 4565 rate = &sband->bitrates[status->rate_idx]; 4566 } 4567 } 4568 4569 status->rx_flags = 0; 4570 4571 /* 4572 * key references and virtual interfaces are protected using RCU 4573 * and this requires that we are in a read-side RCU section during 4574 * receive processing 4575 */ 4576 rcu_read_lock(); 4577 4578 /* 4579 * Frames with failed FCS/PLCP checksum are not returned, 4580 * all other frames are returned without radiotap header 4581 * if it was previously present. 4582 * Also, frames with less than 16 bytes are dropped. 4583 */ 4584 skb = ieee80211_rx_monitor(local, skb, rate); 4585 if (!skb) { 4586 rcu_read_unlock(); 4587 return; 4588 } 4589 4590 ieee80211_tpt_led_trig_rx(local, 4591 ((struct ieee80211_hdr *)skb->data)->frame_control, 4592 skb->len); 4593 4594 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi); 4595 4596 rcu_read_unlock(); 4597 4598 return; 4599 drop: 4600 kfree_skb(skb); 4601 } 4602 EXPORT_SYMBOL(ieee80211_rx_napi); 4603 4604 /* This is a version of the rx handler that can be called from hard irq 4605 * context. Post the skb on the queue and schedule the tasklet */ 4606 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 4607 { 4608 struct ieee80211_local *local = hw_to_local(hw); 4609 4610 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 4611 4612 skb->pkt_type = IEEE80211_RX_MSG; 4613 skb_queue_tail(&local->skb_queue, skb); 4614 tasklet_schedule(&local->tasklet); 4615 } 4616 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 4617