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 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/jiffies.h> 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rcupdate.h> 19 #include <linux/export.h> 20 #include <net/mac80211.h> 21 #include <net/ieee80211_radiotap.h> 22 #include <asm/unaligned.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "led.h" 27 #include "mesh.h" 28 #include "wep.h" 29 #include "wpa.h" 30 #include "tkip.h" 31 #include "wme.h" 32 #include "rate.h" 33 34 /* 35 * monitor mode reception 36 * 37 * This function cleans up the SKB, i.e. it removes all the stuff 38 * only useful for monitoring. 39 */ 40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, 41 struct sk_buff *skb) 42 { 43 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 44 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { 46 if (likely(skb->len > FCS_LEN)) 47 __pskb_trim(skb, skb->len - FCS_LEN); 48 else { 49 /* driver bug */ 50 WARN_ON(1); 51 dev_kfree_skb(skb); 52 return NULL; 53 } 54 } 55 56 if (status->vendor_radiotap_len) 57 __pskb_pull(skb, status->vendor_radiotap_len); 58 59 return skb; 60 } 61 62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len) 63 { 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 65 struct ieee80211_hdr *hdr; 66 67 hdr = (void *)(skb->data + status->vendor_radiotap_len); 68 69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 70 RX_FLAG_FAILED_PLCP_CRC | 71 RX_FLAG_AMPDU_IS_ZEROLEN)) 72 return 1; 73 if (unlikely(skb->len < 16 + present_fcs_len + 74 status->vendor_radiotap_len)) 75 return 1; 76 if (ieee80211_is_ctl(hdr->frame_control) && 77 !ieee80211_is_pspoll(hdr->frame_control) && 78 !ieee80211_is_back_req(hdr->frame_control)) 79 return 1; 80 return 0; 81 } 82 83 static int 84 ieee80211_rx_radiotap_space(struct ieee80211_local *local, 85 struct ieee80211_rx_status *status) 86 { 87 int len; 88 89 /* always present fields */ 90 len = sizeof(struct ieee80211_radiotap_header) + 8; 91 92 /* allocate extra bitmaps */ 93 if (status->vendor_radiotap_len) 94 len += 4; 95 if (status->chains) 96 len += 4 * hweight8(status->chains); 97 98 if (ieee80211_have_rx_timestamp(status)) { 99 len = ALIGN(len, 8); 100 len += 8; 101 } 102 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 103 len += 1; 104 105 /* antenna field, if we don't have per-chain info */ 106 if (!status->chains) 107 len += 1; 108 109 /* padding for RX_FLAGS if necessary */ 110 len = ALIGN(len, 2); 111 112 if (status->flag & RX_FLAG_HT) /* HT info */ 113 len += 3; 114 115 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 116 len = ALIGN(len, 4); 117 len += 8; 118 } 119 120 if (status->flag & RX_FLAG_VHT) { 121 len = ALIGN(len, 2); 122 len += 12; 123 } 124 125 if (status->chains) { 126 /* antenna and antenna signal fields */ 127 len += 2 * hweight8(status->chains); 128 } 129 130 if (status->vendor_radiotap_len) { 131 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0)) 132 status->vendor_radiotap_align = 1; 133 /* align standard part of vendor namespace */ 134 len = ALIGN(len, 2); 135 /* allocate standard part of vendor namespace */ 136 len += 6; 137 /* align vendor-defined part */ 138 len = ALIGN(len, status->vendor_radiotap_align); 139 /* vendor-defined part is already in skb */ 140 } 141 142 return len; 143 } 144 145 /* 146 * ieee80211_add_rx_radiotap_header - add radiotap header 147 * 148 * add a radiotap header containing all the fields which the hardware provided. 149 */ 150 static void 151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 152 struct sk_buff *skb, 153 struct ieee80211_rate *rate, 154 int rtap_len, bool has_fcs) 155 { 156 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 157 struct ieee80211_radiotap_header *rthdr; 158 unsigned char *pos; 159 __le32 *it_present; 160 u32 it_present_val; 161 u16 rx_flags = 0; 162 u16 channel_flags = 0; 163 int mpdulen, chain; 164 unsigned long chains = status->chains; 165 166 mpdulen = skb->len; 167 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))) 168 mpdulen += FCS_LEN; 169 170 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); 171 memset(rthdr, 0, rtap_len); 172 it_present = &rthdr->it_present; 173 174 /* radiotap header, set always present flags */ 175 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len); 176 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 177 BIT(IEEE80211_RADIOTAP_CHANNEL) | 178 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 179 180 if (!status->chains) 181 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 182 183 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 184 it_present_val |= 185 BIT(IEEE80211_RADIOTAP_EXT) | 186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 187 put_unaligned_le32(it_present_val, it_present); 188 it_present++; 189 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 191 } 192 193 if (status->vendor_radiotap_len) { 194 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | 195 BIT(IEEE80211_RADIOTAP_EXT); 196 put_unaligned_le32(it_present_val, it_present); 197 it_present++; 198 it_present_val = status->vendor_radiotap_bitmap; 199 } 200 201 put_unaligned_le32(it_present_val, it_present); 202 203 pos = (void *)(it_present + 1); 204 205 /* the order of the following fields is important */ 206 207 /* IEEE80211_RADIOTAP_TSFT */ 208 if (ieee80211_have_rx_timestamp(status)) { 209 /* padding */ 210 while ((pos - (u8 *)rthdr) & 7) 211 *pos++ = 0; 212 put_unaligned_le64( 213 ieee80211_calculate_rx_timestamp(local, status, 214 mpdulen, 0), 215 pos); 216 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 217 pos += 8; 218 } 219 220 /* IEEE80211_RADIOTAP_FLAGS */ 221 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)) 222 *pos |= IEEE80211_RADIOTAP_F_FCS; 223 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 224 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 225 if (status->flag & RX_FLAG_SHORTPRE) 226 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 227 pos++; 228 229 /* IEEE80211_RADIOTAP_RATE */ 230 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) { 231 /* 232 * Without rate information don't add it. If we have, 233 * MCS information is a separate field in radiotap, 234 * added below. The byte here is needed as padding 235 * for the channel though, so initialise it to 0. 236 */ 237 *pos = 0; 238 } else { 239 int shift = 0; 240 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 241 if (status->flag & RX_FLAG_10MHZ) 242 shift = 1; 243 else if (status->flag & RX_FLAG_5MHZ) 244 shift = 2; 245 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 246 } 247 pos++; 248 249 /* IEEE80211_RADIOTAP_CHANNEL */ 250 put_unaligned_le16(status->freq, pos); 251 pos += 2; 252 if (status->flag & RX_FLAG_10MHZ) 253 channel_flags |= IEEE80211_CHAN_HALF; 254 else if (status->flag & RX_FLAG_5MHZ) 255 channel_flags |= IEEE80211_CHAN_QUARTER; 256 257 if (status->band == IEEE80211_BAND_5GHZ) 258 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 259 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) 260 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 261 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 262 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 263 else if (rate) 264 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 265 else 266 channel_flags |= IEEE80211_CHAN_2GHZ; 267 put_unaligned_le16(channel_flags, pos); 268 pos += 2; 269 270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 271 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM && 272 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 273 *pos = status->signal; 274 rthdr->it_present |= 275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 276 pos++; 277 } 278 279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 280 281 if (!status->chains) { 282 /* IEEE80211_RADIOTAP_ANTENNA */ 283 *pos = status->antenna; 284 pos++; 285 } 286 287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 288 289 /* IEEE80211_RADIOTAP_RX_FLAGS */ 290 /* ensure 2 byte alignment for the 2 byte field as required */ 291 if ((pos - (u8 *)rthdr) & 1) 292 *pos++ = 0; 293 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 294 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 295 put_unaligned_le16(rx_flags, pos); 296 pos += 2; 297 298 if (status->flag & RX_FLAG_HT) { 299 unsigned int stbc; 300 301 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 302 *pos++ = local->hw.radiotap_mcs_details; 303 *pos = 0; 304 if (status->flag & RX_FLAG_SHORT_GI) 305 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 306 if (status->flag & RX_FLAG_40MHZ) 307 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 308 if (status->flag & RX_FLAG_HT_GF) 309 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 310 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT; 311 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 312 pos++; 313 *pos++ = status->rate_idx; 314 } 315 316 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 317 u16 flags = 0; 318 319 /* ensure 4 byte alignment */ 320 while ((pos - (u8 *)rthdr) & 3) 321 pos++; 322 rthdr->it_present |= 323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); 324 put_unaligned_le32(status->ampdu_reference, pos); 325 pos += 4; 326 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN) 327 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN; 328 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN) 329 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN; 330 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 331 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 332 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 333 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 334 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 335 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 336 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 337 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; 338 put_unaligned_le16(flags, pos); 339 pos += 2; 340 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 341 *pos++ = status->ampdu_delimiter_crc; 342 else 343 *pos++ = 0; 344 *pos++ = 0; 345 } 346 347 if (status->flag & RX_FLAG_VHT) { 348 u16 known = local->hw.radiotap_vht_details; 349 350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 351 /* known field - how to handle 80+80? */ 352 if (status->flag & RX_FLAG_80P80MHZ) 353 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 354 put_unaligned_le16(known, pos); 355 pos += 2; 356 /* flags */ 357 if (status->flag & RX_FLAG_SHORT_GI) 358 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 359 pos++; 360 /* bandwidth */ 361 if (status->flag & RX_FLAG_80MHZ) 362 *pos++ = 4; 363 else if (status->flag & RX_FLAG_80P80MHZ) 364 *pos++ = 0; /* marked not known above */ 365 else if (status->flag & RX_FLAG_160MHZ) 366 *pos++ = 11; 367 else if (status->flag & RX_FLAG_40MHZ) 368 *pos++ = 1; 369 else /* 20 MHz */ 370 *pos++ = 0; 371 /* MCS/NSS */ 372 *pos = (status->rate_idx << 4) | status->vht_nss; 373 pos += 4; 374 /* coding field */ 375 pos++; 376 /* group ID */ 377 pos++; 378 /* partial_aid */ 379 pos += 2; 380 } 381 382 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 383 *pos++ = status->chain_signal[chain]; 384 *pos++ = chain; 385 } 386 387 if (status->vendor_radiotap_len) { 388 /* ensure 2 byte alignment for the vendor field as required */ 389 if ((pos - (u8 *)rthdr) & 1) 390 *pos++ = 0; 391 *pos++ = status->vendor_radiotap_oui[0]; 392 *pos++ = status->vendor_radiotap_oui[1]; 393 *pos++ = status->vendor_radiotap_oui[2]; 394 *pos++ = status->vendor_radiotap_subns; 395 put_unaligned_le16(status->vendor_radiotap_len, pos); 396 pos += 2; 397 /* align the actual payload as requested */ 398 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1)) 399 *pos++ = 0; 400 } 401 } 402 403 /* 404 * This function copies a received frame to all monitor interfaces and 405 * returns a cleaned-up SKB that no longer includes the FCS nor the 406 * radiotap header the driver might have added. 407 */ 408 static struct sk_buff * 409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 410 struct ieee80211_rate *rate) 411 { 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 413 struct ieee80211_sub_if_data *sdata; 414 int needed_headroom; 415 struct sk_buff *skb, *skb2; 416 struct net_device *prev_dev = NULL; 417 int present_fcs_len = 0; 418 419 /* 420 * First, we may need to make a copy of the skb because 421 * (1) we need to modify it for radiotap (if not present), and 422 * (2) the other RX handlers will modify the skb we got. 423 * 424 * We don't need to, of course, if we aren't going to return 425 * the SKB because it has a bad FCS/PLCP checksum. 426 */ 427 428 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 429 present_fcs_len = FCS_LEN; 430 431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */ 432 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) { 433 dev_kfree_skb(origskb); 434 return NULL; 435 } 436 437 if (!local->monitors) { 438 if (should_drop_frame(origskb, present_fcs_len)) { 439 dev_kfree_skb(origskb); 440 return NULL; 441 } 442 443 return remove_monitor_info(local, origskb); 444 } 445 446 /* room for the radiotap header based on driver features */ 447 needed_headroom = ieee80211_rx_radiotap_space(local, status); 448 449 if (should_drop_frame(origskb, present_fcs_len)) { 450 /* only need to expand headroom if necessary */ 451 skb = origskb; 452 origskb = NULL; 453 454 /* 455 * This shouldn't trigger often because most devices have an 456 * RX header they pull before we get here, and that should 457 * be big enough for our radiotap information. We should 458 * probably export the length to drivers so that we can have 459 * them allocate enough headroom to start with. 460 */ 461 if (skb_headroom(skb) < needed_headroom && 462 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 463 dev_kfree_skb(skb); 464 return NULL; 465 } 466 } else { 467 /* 468 * Need to make a copy and possibly remove radiotap header 469 * and FCS from the original. 470 */ 471 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); 472 473 origskb = remove_monitor_info(local, origskb); 474 475 if (!skb) 476 return origskb; 477 } 478 479 /* prepend radiotap information */ 480 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 481 true); 482 483 skb_reset_mac_header(skb); 484 skb->ip_summed = CHECKSUM_UNNECESSARY; 485 skb->pkt_type = PACKET_OTHERHOST; 486 skb->protocol = htons(ETH_P_802_2); 487 488 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 489 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) 490 continue; 491 492 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) 493 continue; 494 495 if (!ieee80211_sdata_running(sdata)) 496 continue; 497 498 if (prev_dev) { 499 skb2 = skb_clone(skb, GFP_ATOMIC); 500 if (skb2) { 501 skb2->dev = prev_dev; 502 netif_receive_skb(skb2); 503 } 504 } 505 506 prev_dev = sdata->dev; 507 sdata->dev->stats.rx_packets++; 508 sdata->dev->stats.rx_bytes += skb->len; 509 } 510 511 if (prev_dev) { 512 skb->dev = prev_dev; 513 netif_receive_skb(skb); 514 } else 515 dev_kfree_skb(skb); 516 517 return origskb; 518 } 519 520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 521 { 522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 524 int tid, seqno_idx, security_idx; 525 526 /* does the frame have a qos control field? */ 527 if (ieee80211_is_data_qos(hdr->frame_control)) { 528 u8 *qc = ieee80211_get_qos_ctl(hdr); 529 /* frame has qos control */ 530 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 531 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 532 status->rx_flags |= IEEE80211_RX_AMSDU; 533 534 seqno_idx = tid; 535 security_idx = tid; 536 } else { 537 /* 538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 539 * 540 * Sequence numbers for management frames, QoS data 541 * frames with a broadcast/multicast address in the 542 * Address 1 field, and all non-QoS data frames sent 543 * by QoS STAs are assigned using an additional single 544 * modulo-4096 counter, [...] 545 * 546 * We also use that counter for non-QoS STAs. 547 */ 548 seqno_idx = IEEE80211_NUM_TIDS; 549 security_idx = 0; 550 if (ieee80211_is_mgmt(hdr->frame_control)) 551 security_idx = IEEE80211_NUM_TIDS; 552 tid = 0; 553 } 554 555 rx->seqno_idx = seqno_idx; 556 rx->security_idx = security_idx; 557 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 558 * For now, set skb->priority to 0 for other cases. */ 559 rx->skb->priority = (tid > 7) ? 0 : tid; 560 } 561 562 /** 563 * DOC: Packet alignment 564 * 565 * Drivers always need to pass packets that are aligned to two-byte boundaries 566 * to the stack. 567 * 568 * Additionally, should, if possible, align the payload data in a way that 569 * guarantees that the contained IP header is aligned to a four-byte 570 * boundary. In the case of regular frames, this simply means aligning the 571 * payload to a four-byte boundary (because either the IP header is directly 572 * contained, or IV/RFC1042 headers that have a length divisible by four are 573 * in front of it). If the payload data is not properly aligned and the 574 * architecture doesn't support efficient unaligned operations, mac80211 575 * will align the data. 576 * 577 * With A-MSDU frames, however, the payload data address must yield two modulo 578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 579 * push the IP header further back to a multiple of four again. Thankfully, the 580 * specs were sane enough this time around to require padding each A-MSDU 581 * subframe to a length that is a multiple of four. 582 * 583 * Padding like Atheros hardware adds which is between the 802.11 header and 584 * the payload is not supported, the driver is required to move the 802.11 585 * header to be directly in front of the payload in that case. 586 */ 587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 588 { 589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 590 WARN_ONCE((unsigned long)rx->skb->data & 1, 591 "unaligned packet at 0x%p\n", rx->skb->data); 592 #endif 593 } 594 595 596 /* rx handlers */ 597 598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 599 { 600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 601 602 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) 603 return 0; 604 605 return ieee80211_is_robust_mgmt_frame(hdr); 606 } 607 608 609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 610 { 611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 612 613 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) 614 return 0; 615 616 return ieee80211_is_robust_mgmt_frame(hdr); 617 } 618 619 620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 622 { 623 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 624 struct ieee80211_mmie *mmie; 625 626 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 627 return -1; 628 629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) 630 return -1; /* not a robust management frame */ 631 632 mmie = (struct ieee80211_mmie *) 633 (skb->data + skb->len - sizeof(*mmie)); 634 if (mmie->element_id != WLAN_EID_MMIE || 635 mmie->length != sizeof(*mmie) - 2) 636 return -1; 637 638 return le16_to_cpu(mmie->key_id); 639 } 640 641 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 642 { 643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 644 char *dev_addr = rx->sdata->vif.addr; 645 646 if (ieee80211_is_data(hdr->frame_control)) { 647 if (is_multicast_ether_addr(hdr->addr1)) { 648 if (ieee80211_has_tods(hdr->frame_control) || 649 !ieee80211_has_fromds(hdr->frame_control)) 650 return RX_DROP_MONITOR; 651 if (ether_addr_equal(hdr->addr3, dev_addr)) 652 return RX_DROP_MONITOR; 653 } else { 654 if (!ieee80211_has_a4(hdr->frame_control)) 655 return RX_DROP_MONITOR; 656 if (ether_addr_equal(hdr->addr4, dev_addr)) 657 return RX_DROP_MONITOR; 658 } 659 } 660 661 /* If there is not an established peer link and this is not a peer link 662 * establisment frame, beacon or probe, drop the frame. 663 */ 664 665 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 666 struct ieee80211_mgmt *mgmt; 667 668 if (!ieee80211_is_mgmt(hdr->frame_control)) 669 return RX_DROP_MONITOR; 670 671 if (ieee80211_is_action(hdr->frame_control)) { 672 u8 category; 673 674 /* make sure category field is present */ 675 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 676 return RX_DROP_MONITOR; 677 678 mgmt = (struct ieee80211_mgmt *)hdr; 679 category = mgmt->u.action.category; 680 if (category != WLAN_CATEGORY_MESH_ACTION && 681 category != WLAN_CATEGORY_SELF_PROTECTED) 682 return RX_DROP_MONITOR; 683 return RX_CONTINUE; 684 } 685 686 if (ieee80211_is_probe_req(hdr->frame_control) || 687 ieee80211_is_probe_resp(hdr->frame_control) || 688 ieee80211_is_beacon(hdr->frame_control) || 689 ieee80211_is_auth(hdr->frame_control)) 690 return RX_CONTINUE; 691 692 return RX_DROP_MONITOR; 693 } 694 695 return RX_CONTINUE; 696 } 697 698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 699 struct tid_ampdu_rx *tid_agg_rx, 700 int index, 701 struct sk_buff_head *frames) 702 { 703 struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; 704 struct ieee80211_rx_status *status; 705 706 lockdep_assert_held(&tid_agg_rx->reorder_lock); 707 708 if (!skb) 709 goto no_frame; 710 711 /* release the frame from the reorder ring buffer */ 712 tid_agg_rx->stored_mpdu_num--; 713 tid_agg_rx->reorder_buf[index] = NULL; 714 status = IEEE80211_SKB_RXCB(skb); 715 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 716 __skb_queue_tail(frames, skb); 717 718 no_frame: 719 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 720 } 721 722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 723 struct tid_ampdu_rx *tid_agg_rx, 724 u16 head_seq_num, 725 struct sk_buff_head *frames) 726 { 727 int index; 728 729 lockdep_assert_held(&tid_agg_rx->reorder_lock); 730 731 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 732 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, 733 tid_agg_rx->ssn) % 734 tid_agg_rx->buf_size; 735 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 736 frames); 737 } 738 } 739 740 /* 741 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 742 * the skb was added to the buffer longer than this time ago, the earlier 743 * frames that have not yet been received are assumed to be lost and the skb 744 * can be released for processing. This may also release other skb's from the 745 * reorder buffer if there are no additional gaps between the frames. 746 * 747 * Callers must hold tid_agg_rx->reorder_lock. 748 */ 749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 750 751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 752 struct tid_ampdu_rx *tid_agg_rx, 753 struct sk_buff_head *frames) 754 { 755 int index, j; 756 757 lockdep_assert_held(&tid_agg_rx->reorder_lock); 758 759 /* release the buffer until next missing frame */ 760 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, 761 tid_agg_rx->ssn) % tid_agg_rx->buf_size; 762 if (!tid_agg_rx->reorder_buf[index] && 763 tid_agg_rx->stored_mpdu_num) { 764 /* 765 * No buffers ready to be released, but check whether any 766 * frames in the reorder buffer have timed out. 767 */ 768 int skipped = 1; 769 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 770 j = (j + 1) % tid_agg_rx->buf_size) { 771 if (!tid_agg_rx->reorder_buf[j]) { 772 skipped++; 773 continue; 774 } 775 if (skipped && 776 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 777 HT_RX_REORDER_BUF_TIMEOUT)) 778 goto set_release_timer; 779 780 ht_dbg_ratelimited(sdata, 781 "release an RX reorder frame due to timeout on earlier frames\n"); 782 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 783 frames); 784 785 /* 786 * Increment the head seq# also for the skipped slots. 787 */ 788 tid_agg_rx->head_seq_num = 789 (tid_agg_rx->head_seq_num + 790 skipped) & IEEE80211_SN_MASK; 791 skipped = 0; 792 } 793 } else while (tid_agg_rx->reorder_buf[index]) { 794 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 795 frames); 796 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, 797 tid_agg_rx->ssn) % 798 tid_agg_rx->buf_size; 799 } 800 801 if (tid_agg_rx->stored_mpdu_num) { 802 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, 803 tid_agg_rx->ssn) % 804 tid_agg_rx->buf_size; 805 806 for (; j != (index - 1) % tid_agg_rx->buf_size; 807 j = (j + 1) % tid_agg_rx->buf_size) { 808 if (tid_agg_rx->reorder_buf[j]) 809 break; 810 } 811 812 set_release_timer: 813 814 mod_timer(&tid_agg_rx->reorder_timer, 815 tid_agg_rx->reorder_time[j] + 1 + 816 HT_RX_REORDER_BUF_TIMEOUT); 817 } else { 818 del_timer(&tid_agg_rx->reorder_timer); 819 } 820 } 821 822 /* 823 * As this function belongs to the RX path it must be under 824 * rcu_read_lock protection. It returns false if the frame 825 * can be processed immediately, true if it was consumed. 826 */ 827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 828 struct tid_ampdu_rx *tid_agg_rx, 829 struct sk_buff *skb, 830 struct sk_buff_head *frames) 831 { 832 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 833 u16 sc = le16_to_cpu(hdr->seq_ctrl); 834 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 835 u16 head_seq_num, buf_size; 836 int index; 837 bool ret = true; 838 839 spin_lock(&tid_agg_rx->reorder_lock); 840 841 buf_size = tid_agg_rx->buf_size; 842 head_seq_num = tid_agg_rx->head_seq_num; 843 844 /* frame with out of date sequence number */ 845 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 846 dev_kfree_skb(skb); 847 goto out; 848 } 849 850 /* 851 * If frame the sequence number exceeds our buffering window 852 * size release some previous frames to make room for this one. 853 */ 854 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 855 head_seq_num = ieee80211_sn_inc( 856 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 857 /* release stored frames up to new head to stack */ 858 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 859 head_seq_num, frames); 860 } 861 862 /* Now the new frame is always in the range of the reordering buffer */ 863 864 index = ieee80211_sn_sub(mpdu_seq_num, 865 tid_agg_rx->ssn) % tid_agg_rx->buf_size; 866 867 /* check if we already stored this frame */ 868 if (tid_agg_rx->reorder_buf[index]) { 869 dev_kfree_skb(skb); 870 goto out; 871 } 872 873 /* 874 * If the current MPDU is in the right order and nothing else 875 * is stored we can process it directly, no need to buffer it. 876 * If it is first but there's something stored, we may be able 877 * to release frames after this one. 878 */ 879 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 880 tid_agg_rx->stored_mpdu_num == 0) { 881 tid_agg_rx->head_seq_num = 882 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 883 ret = false; 884 goto out; 885 } 886 887 /* put the frame in the reordering buffer */ 888 tid_agg_rx->reorder_buf[index] = skb; 889 tid_agg_rx->reorder_time[index] = jiffies; 890 tid_agg_rx->stored_mpdu_num++; 891 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 892 893 out: 894 spin_unlock(&tid_agg_rx->reorder_lock); 895 return ret; 896 } 897 898 /* 899 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 900 * true if the MPDU was buffered, false if it should be processed. 901 */ 902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 903 struct sk_buff_head *frames) 904 { 905 struct sk_buff *skb = rx->skb; 906 struct ieee80211_local *local = rx->local; 907 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 908 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 909 struct sta_info *sta = rx->sta; 910 struct tid_ampdu_rx *tid_agg_rx; 911 u16 sc; 912 u8 tid, ack_policy; 913 914 if (!ieee80211_is_data_qos(hdr->frame_control)) 915 goto dont_reorder; 916 917 /* 918 * filter the QoS data rx stream according to 919 * STA/TID and check if this STA/TID is on aggregation 920 */ 921 922 if (!sta) 923 goto dont_reorder; 924 925 ack_policy = *ieee80211_get_qos_ctl(hdr) & 926 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 927 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 928 929 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 930 if (!tid_agg_rx) 931 goto dont_reorder; 932 933 /* qos null data frames are excluded */ 934 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 935 goto dont_reorder; 936 937 /* not part of a BA session */ 938 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 939 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) 940 goto dont_reorder; 941 942 /* not actually part of this BA session */ 943 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 944 goto dont_reorder; 945 946 /* new, potentially un-ordered, ampdu frame - process it */ 947 948 /* reset session timer */ 949 if (tid_agg_rx->timeout) 950 tid_agg_rx->last_rx = jiffies; 951 952 /* if this mpdu is fragmented - terminate rx aggregation session */ 953 sc = le16_to_cpu(hdr->seq_ctrl); 954 if (sc & IEEE80211_SCTL_FRAG) { 955 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 956 skb_queue_tail(&rx->sdata->skb_queue, skb); 957 ieee80211_queue_work(&local->hw, &rx->sdata->work); 958 return; 959 } 960 961 /* 962 * No locking needed -- we will only ever process one 963 * RX packet at a time, and thus own tid_agg_rx. All 964 * other code manipulating it needs to (and does) make 965 * sure that we cannot get to it any more before doing 966 * anything with it. 967 */ 968 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 969 frames)) 970 return; 971 972 dont_reorder: 973 __skb_queue_tail(frames, skb); 974 } 975 976 static ieee80211_rx_result debug_noinline 977 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 978 { 979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 980 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 981 982 /* 983 * Drop duplicate 802.11 retransmissions 984 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 985 */ 986 if (rx->skb->len >= 24 && rx->sta && 987 !ieee80211_is_ctl(hdr->frame_control) && 988 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 989 !is_multicast_ether_addr(hdr->addr1)) { 990 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 991 rx->sta->last_seq_ctrl[rx->seqno_idx] == 992 hdr->seq_ctrl)) { 993 if (status->rx_flags & IEEE80211_RX_RA_MATCH) { 994 rx->local->dot11FrameDuplicateCount++; 995 rx->sta->num_duplicates++; 996 } 997 return RX_DROP_UNUSABLE; 998 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 999 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1000 } 1001 } 1002 1003 if (unlikely(rx->skb->len < 16)) { 1004 I802_DEBUG_INC(rx->local->rx_handlers_drop_short); 1005 return RX_DROP_MONITOR; 1006 } 1007 1008 /* Drop disallowed frame classes based on STA auth/assoc state; 1009 * IEEE 802.11, Chap 5.5. 1010 * 1011 * mac80211 filters only based on association state, i.e. it drops 1012 * Class 3 frames from not associated stations. hostapd sends 1013 * deauth/disassoc frames when needed. In addition, hostapd is 1014 * responsible for filtering on both auth and assoc states. 1015 */ 1016 1017 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1018 return ieee80211_rx_mesh_check(rx); 1019 1020 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1021 ieee80211_is_pspoll(hdr->frame_control)) && 1022 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1023 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 1024 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1025 /* 1026 * accept port control frames from the AP even when it's not 1027 * yet marked ASSOC to prevent a race where we don't set the 1028 * assoc bit quickly enough before it sends the first frame 1029 */ 1030 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1031 ieee80211_is_data_present(hdr->frame_control)) { 1032 unsigned int hdrlen; 1033 __be16 ethertype; 1034 1035 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1036 1037 if (rx->skb->len < hdrlen + 8) 1038 return RX_DROP_MONITOR; 1039 1040 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1041 if (ethertype == rx->sdata->control_port_protocol) 1042 return RX_CONTINUE; 1043 } 1044 1045 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1046 cfg80211_rx_spurious_frame(rx->sdata->dev, 1047 hdr->addr2, 1048 GFP_ATOMIC)) 1049 return RX_DROP_UNUSABLE; 1050 1051 return RX_DROP_MONITOR; 1052 } 1053 1054 return RX_CONTINUE; 1055 } 1056 1057 1058 static ieee80211_rx_result debug_noinline 1059 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1060 { 1061 struct ieee80211_local *local; 1062 struct ieee80211_hdr *hdr; 1063 struct sk_buff *skb; 1064 1065 local = rx->local; 1066 skb = rx->skb; 1067 hdr = (struct ieee80211_hdr *) skb->data; 1068 1069 if (!local->pspolling) 1070 return RX_CONTINUE; 1071 1072 if (!ieee80211_has_fromds(hdr->frame_control)) 1073 /* this is not from AP */ 1074 return RX_CONTINUE; 1075 1076 if (!ieee80211_is_data(hdr->frame_control)) 1077 return RX_CONTINUE; 1078 1079 if (!ieee80211_has_moredata(hdr->frame_control)) { 1080 /* AP has no more frames buffered for us */ 1081 local->pspolling = false; 1082 return RX_CONTINUE; 1083 } 1084 1085 /* more data bit is set, let's request a new frame from the AP */ 1086 ieee80211_send_pspoll(local, rx->sdata); 1087 1088 return RX_CONTINUE; 1089 } 1090 1091 static void sta_ps_start(struct sta_info *sta) 1092 { 1093 struct ieee80211_sub_if_data *sdata = sta->sdata; 1094 struct ieee80211_local *local = sdata->local; 1095 struct ps_data *ps; 1096 1097 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1098 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1099 ps = &sdata->bss->ps; 1100 else 1101 return; 1102 1103 atomic_inc(&ps->num_sta_ps); 1104 set_sta_flag(sta, WLAN_STA_PS_STA); 1105 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1106 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1107 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1108 sta->sta.addr, sta->sta.aid); 1109 } 1110 1111 static void sta_ps_end(struct sta_info *sta) 1112 { 1113 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1114 sta->sta.addr, sta->sta.aid); 1115 1116 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1117 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1118 sta->sta.addr, sta->sta.aid); 1119 return; 1120 } 1121 1122 ieee80211_sta_ps_deliver_wakeup(sta); 1123 } 1124 1125 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) 1126 { 1127 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); 1128 bool in_ps; 1129 1130 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); 1131 1132 /* Don't let the same PS state be set twice */ 1133 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); 1134 if ((start && in_ps) || (!start && !in_ps)) 1135 return -EINVAL; 1136 1137 if (start) 1138 sta_ps_start(sta_inf); 1139 else 1140 sta_ps_end(sta_inf); 1141 1142 return 0; 1143 } 1144 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1145 1146 static ieee80211_rx_result debug_noinline 1147 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1148 { 1149 struct ieee80211_sub_if_data *sdata = rx->sdata; 1150 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1151 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1152 int tid, ac; 1153 1154 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1155 return RX_CONTINUE; 1156 1157 if (sdata->vif.type != NL80211_IFTYPE_AP && 1158 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1159 return RX_CONTINUE; 1160 1161 /* 1162 * The device handles station powersave, so don't do anything about 1163 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1164 * it to mac80211 since they're handled.) 1165 */ 1166 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) 1167 return RX_CONTINUE; 1168 1169 /* 1170 * Don't do anything if the station isn't already asleep. In 1171 * the uAPSD case, the station will probably be marked asleep, 1172 * in the PS-Poll case the station must be confused ... 1173 */ 1174 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1175 return RX_CONTINUE; 1176 1177 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1178 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { 1179 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1180 ieee80211_sta_ps_deliver_poll_response(rx->sta); 1181 else 1182 set_sta_flag(rx->sta, WLAN_STA_PSPOLL); 1183 } 1184 1185 /* Free PS Poll skb here instead of returning RX_DROP that would 1186 * count as an dropped frame. */ 1187 dev_kfree_skb(rx->skb); 1188 1189 return RX_QUEUED; 1190 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1191 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1192 ieee80211_has_pm(hdr->frame_control) && 1193 (ieee80211_is_data_qos(hdr->frame_control) || 1194 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1195 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 1196 ac = ieee802_1d_to_ac[tid & 7]; 1197 1198 /* 1199 * If this AC is not trigger-enabled do nothing. 1200 * 1201 * NB: This could/should check a separate bitmap of trigger- 1202 * enabled queues, but for now we only implement uAPSD w/o 1203 * TSPEC changes to the ACs, so they're always the same. 1204 */ 1205 if (!(rx->sta->sta.uapsd_queues & BIT(ac))) 1206 return RX_CONTINUE; 1207 1208 /* if we are in a service period, do nothing */ 1209 if (test_sta_flag(rx->sta, WLAN_STA_SP)) 1210 return RX_CONTINUE; 1211 1212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1213 ieee80211_sta_ps_deliver_uapsd(rx->sta); 1214 else 1215 set_sta_flag(rx->sta, WLAN_STA_UAPSD); 1216 } 1217 1218 return RX_CONTINUE; 1219 } 1220 1221 static ieee80211_rx_result debug_noinline 1222 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1223 { 1224 struct sta_info *sta = rx->sta; 1225 struct sk_buff *skb = rx->skb; 1226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1227 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1228 int i; 1229 1230 if (!sta) 1231 return RX_CONTINUE; 1232 1233 /* 1234 * Update last_rx only for IBSS packets which are for the current 1235 * BSSID and for station already AUTHORIZED to avoid keeping the 1236 * current IBSS network alive in cases where other STAs start 1237 * using different BSSID. This will also give the station another 1238 * chance to restart the authentication/authorization in case 1239 * something went wrong the first time. 1240 */ 1241 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1242 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1243 NL80211_IFTYPE_ADHOC); 1244 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1245 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1246 sta->last_rx = jiffies; 1247 if (ieee80211_is_data(hdr->frame_control)) { 1248 sta->last_rx_rate_idx = status->rate_idx; 1249 sta->last_rx_rate_flag = status->flag; 1250 sta->last_rx_rate_vht_nss = status->vht_nss; 1251 } 1252 } 1253 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1254 /* 1255 * Mesh beacons will update last_rx when if they are found to 1256 * match the current local configuration when processed. 1257 */ 1258 sta->last_rx = jiffies; 1259 if (ieee80211_is_data(hdr->frame_control)) { 1260 sta->last_rx_rate_idx = status->rate_idx; 1261 sta->last_rx_rate_flag = status->flag; 1262 sta->last_rx_rate_vht_nss = status->vht_nss; 1263 } 1264 } 1265 1266 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1267 return RX_CONTINUE; 1268 1269 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1270 ieee80211_sta_rx_notify(rx->sdata, hdr); 1271 1272 sta->rx_fragments++; 1273 sta->rx_bytes += rx->skb->len; 1274 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1275 sta->last_signal = status->signal; 1276 ewma_add(&sta->avg_signal, -status->signal); 1277 } 1278 1279 if (status->chains) { 1280 sta->chains = status->chains; 1281 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1282 int signal = status->chain_signal[i]; 1283 1284 if (!(status->chains & BIT(i))) 1285 continue; 1286 1287 sta->chain_signal_last[i] = signal; 1288 ewma_add(&sta->chain_signal_avg[i], -signal); 1289 } 1290 } 1291 1292 /* 1293 * Change STA power saving mode only at the end of a frame 1294 * exchange sequence. 1295 */ 1296 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && 1297 !ieee80211_has_morefrags(hdr->frame_control) && 1298 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1299 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1300 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1301 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1302 /* 1303 * Ignore doze->wake transitions that are 1304 * indicated by non-data frames, the standard 1305 * is unclear here, but for example going to 1306 * PS mode and then scanning would cause a 1307 * doze->wake transition for the probe request, 1308 * and that is clearly undesirable. 1309 */ 1310 if (ieee80211_is_data(hdr->frame_control) && 1311 !ieee80211_has_pm(hdr->frame_control)) 1312 sta_ps_end(sta); 1313 } else { 1314 if (ieee80211_has_pm(hdr->frame_control)) 1315 sta_ps_start(sta); 1316 } 1317 } 1318 1319 /* mesh power save support */ 1320 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1321 ieee80211_mps_rx_h_sta_process(sta, hdr); 1322 1323 /* 1324 * Drop (qos-)data::nullfunc frames silently, since they 1325 * are used only to control station power saving mode. 1326 */ 1327 if (ieee80211_is_nullfunc(hdr->frame_control) || 1328 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1329 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1330 1331 /* 1332 * If we receive a 4-addr nullfunc frame from a STA 1333 * that was not moved to a 4-addr STA vlan yet send 1334 * the event to userspace and for older hostapd drop 1335 * the frame to the monitor interface. 1336 */ 1337 if (ieee80211_has_a4(hdr->frame_control) && 1338 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1339 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1340 !rx->sdata->u.vlan.sta))) { 1341 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1342 cfg80211_rx_unexpected_4addr_frame( 1343 rx->sdata->dev, sta->sta.addr, 1344 GFP_ATOMIC); 1345 return RX_DROP_MONITOR; 1346 } 1347 /* 1348 * Update counter and free packet here to avoid 1349 * counting this as a dropped packed. 1350 */ 1351 sta->rx_packets++; 1352 dev_kfree_skb(rx->skb); 1353 return RX_QUEUED; 1354 } 1355 1356 return RX_CONTINUE; 1357 } /* ieee80211_rx_h_sta_process */ 1358 1359 static ieee80211_rx_result debug_noinline 1360 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1361 { 1362 struct sk_buff *skb = rx->skb; 1363 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1364 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1365 int keyidx; 1366 int hdrlen; 1367 ieee80211_rx_result result = RX_DROP_UNUSABLE; 1368 struct ieee80211_key *sta_ptk = NULL; 1369 int mmie_keyidx = -1; 1370 __le16 fc; 1371 1372 /* 1373 * Key selection 101 1374 * 1375 * There are four types of keys: 1376 * - GTK (group keys) 1377 * - IGTK (group keys for management frames) 1378 * - PTK (pairwise keys) 1379 * - STK (station-to-station pairwise keys) 1380 * 1381 * When selecting a key, we have to distinguish between multicast 1382 * (including broadcast) and unicast frames, the latter can only 1383 * use PTKs and STKs while the former always use GTKs and IGTKs. 1384 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 1385 * unicast frames can also use key indices like GTKs. Hence, if we 1386 * don't have a PTK/STK we check the key index for a WEP key. 1387 * 1388 * Note that in a regular BSS, multicast frames are sent by the 1389 * AP only, associated stations unicast the frame to the AP first 1390 * which then multicasts it on their behalf. 1391 * 1392 * There is also a slight problem in IBSS mode: GTKs are negotiated 1393 * with each station, that is something we don't currently handle. 1394 * The spec seems to expect that one negotiates the same key with 1395 * every station but there's no such requirement; VLANs could be 1396 * possible. 1397 */ 1398 1399 /* 1400 * No point in finding a key and decrypting if the frame is neither 1401 * addressed to us nor a multicast frame. 1402 */ 1403 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1404 return RX_CONTINUE; 1405 1406 /* start without a key */ 1407 rx->key = NULL; 1408 1409 if (rx->sta) 1410 sta_ptk = rcu_dereference(rx->sta->ptk); 1411 1412 fc = hdr->frame_control; 1413 1414 if (!ieee80211_has_protected(fc)) 1415 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1416 1417 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1418 rx->key = sta_ptk; 1419 if ((status->flag & RX_FLAG_DECRYPTED) && 1420 (status->flag & RX_FLAG_IV_STRIPPED)) 1421 return RX_CONTINUE; 1422 /* Skip decryption if the frame is not protected. */ 1423 if (!ieee80211_has_protected(fc)) 1424 return RX_CONTINUE; 1425 } else if (mmie_keyidx >= 0) { 1426 /* Broadcast/multicast robust management frame / BIP */ 1427 if ((status->flag & RX_FLAG_DECRYPTED) && 1428 (status->flag & RX_FLAG_IV_STRIPPED)) 1429 return RX_CONTINUE; 1430 1431 if (mmie_keyidx < NUM_DEFAULT_KEYS || 1432 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1433 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1434 if (rx->sta) 1435 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 1436 if (!rx->key) 1437 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 1438 } else if (!ieee80211_has_protected(fc)) { 1439 /* 1440 * The frame was not protected, so skip decryption. However, we 1441 * need to set rx->key if there is a key that could have been 1442 * used so that the frame may be dropped if encryption would 1443 * have been expected. 1444 */ 1445 struct ieee80211_key *key = NULL; 1446 struct ieee80211_sub_if_data *sdata = rx->sdata; 1447 int i; 1448 1449 if (ieee80211_is_mgmt(fc) && 1450 is_multicast_ether_addr(hdr->addr1) && 1451 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 1452 rx->key = key; 1453 else { 1454 if (rx->sta) { 1455 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1456 key = rcu_dereference(rx->sta->gtk[i]); 1457 if (key) 1458 break; 1459 } 1460 } 1461 if (!key) { 1462 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1463 key = rcu_dereference(sdata->keys[i]); 1464 if (key) 1465 break; 1466 } 1467 } 1468 if (key) 1469 rx->key = key; 1470 } 1471 return RX_CONTINUE; 1472 } else { 1473 u8 keyid; 1474 /* 1475 * The device doesn't give us the IV so we won't be 1476 * able to look up the key. That's ok though, we 1477 * don't need to decrypt the frame, we just won't 1478 * be able to keep statistics accurate. 1479 * Except for key threshold notifications, should 1480 * we somehow allow the driver to tell us which key 1481 * the hardware used if this flag is set? 1482 */ 1483 if ((status->flag & RX_FLAG_DECRYPTED) && 1484 (status->flag & RX_FLAG_IV_STRIPPED)) 1485 return RX_CONTINUE; 1486 1487 hdrlen = ieee80211_hdrlen(fc); 1488 1489 if (rx->skb->len < 8 + hdrlen) 1490 return RX_DROP_UNUSABLE; /* TODO: count this? */ 1491 1492 /* 1493 * no need to call ieee80211_wep_get_keyidx, 1494 * it verifies a bunch of things we've done already 1495 */ 1496 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 1497 keyidx = keyid >> 6; 1498 1499 /* check per-station GTK first, if multicast packet */ 1500 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1501 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1502 1503 /* if not found, try default key */ 1504 if (!rx->key) { 1505 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1506 1507 /* 1508 * RSNA-protected unicast frames should always be 1509 * sent with pairwise or station-to-station keys, 1510 * but for WEP we allow using a key index as well. 1511 */ 1512 if (rx->key && 1513 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 1514 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 1515 !is_multicast_ether_addr(hdr->addr1)) 1516 rx->key = NULL; 1517 } 1518 } 1519 1520 if (rx->key) { 1521 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 1522 return RX_DROP_MONITOR; 1523 1524 rx->key->tx_rx_count++; 1525 /* TODO: add threshold stuff again */ 1526 } else { 1527 return RX_DROP_MONITOR; 1528 } 1529 1530 switch (rx->key->conf.cipher) { 1531 case WLAN_CIPHER_SUITE_WEP40: 1532 case WLAN_CIPHER_SUITE_WEP104: 1533 result = ieee80211_crypto_wep_decrypt(rx); 1534 break; 1535 case WLAN_CIPHER_SUITE_TKIP: 1536 result = ieee80211_crypto_tkip_decrypt(rx); 1537 break; 1538 case WLAN_CIPHER_SUITE_CCMP: 1539 result = ieee80211_crypto_ccmp_decrypt(rx); 1540 break; 1541 case WLAN_CIPHER_SUITE_AES_CMAC: 1542 result = ieee80211_crypto_aes_cmac_decrypt(rx); 1543 break; 1544 default: 1545 /* 1546 * We can reach here only with HW-only algorithms 1547 * but why didn't it decrypt the frame?! 1548 */ 1549 return RX_DROP_UNUSABLE; 1550 } 1551 1552 /* the hdr variable is invalid after the decrypt handlers */ 1553 1554 /* either the frame has been decrypted or will be dropped */ 1555 status->flag |= RX_FLAG_DECRYPTED; 1556 1557 return result; 1558 } 1559 1560 static inline struct ieee80211_fragment_entry * 1561 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, 1562 unsigned int frag, unsigned int seq, int rx_queue, 1563 struct sk_buff **skb) 1564 { 1565 struct ieee80211_fragment_entry *entry; 1566 1567 entry = &sdata->fragments[sdata->fragment_next++]; 1568 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) 1569 sdata->fragment_next = 0; 1570 1571 if (!skb_queue_empty(&entry->skb_list)) 1572 __skb_queue_purge(&entry->skb_list); 1573 1574 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 1575 *skb = NULL; 1576 entry->first_frag_time = jiffies; 1577 entry->seq = seq; 1578 entry->rx_queue = rx_queue; 1579 entry->last_frag = frag; 1580 entry->ccmp = 0; 1581 entry->extra_len = 0; 1582 1583 return entry; 1584 } 1585 1586 static inline struct ieee80211_fragment_entry * 1587 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, 1588 unsigned int frag, unsigned int seq, 1589 int rx_queue, struct ieee80211_hdr *hdr) 1590 { 1591 struct ieee80211_fragment_entry *entry; 1592 int i, idx; 1593 1594 idx = sdata->fragment_next; 1595 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 1596 struct ieee80211_hdr *f_hdr; 1597 1598 idx--; 1599 if (idx < 0) 1600 idx = IEEE80211_FRAGMENT_MAX - 1; 1601 1602 entry = &sdata->fragments[idx]; 1603 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 1604 entry->rx_queue != rx_queue || 1605 entry->last_frag + 1 != frag) 1606 continue; 1607 1608 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; 1609 1610 /* 1611 * Check ftype and addresses are equal, else check next fragment 1612 */ 1613 if (((hdr->frame_control ^ f_hdr->frame_control) & 1614 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 1615 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 1616 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 1617 continue; 1618 1619 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 1620 __skb_queue_purge(&entry->skb_list); 1621 continue; 1622 } 1623 return entry; 1624 } 1625 1626 return NULL; 1627 } 1628 1629 static ieee80211_rx_result debug_noinline 1630 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 1631 { 1632 struct ieee80211_hdr *hdr; 1633 u16 sc; 1634 __le16 fc; 1635 unsigned int frag, seq; 1636 struct ieee80211_fragment_entry *entry; 1637 struct sk_buff *skb; 1638 struct ieee80211_rx_status *status; 1639 1640 hdr = (struct ieee80211_hdr *)rx->skb->data; 1641 fc = hdr->frame_control; 1642 1643 if (ieee80211_is_ctl(fc)) 1644 return RX_CONTINUE; 1645 1646 sc = le16_to_cpu(hdr->seq_ctrl); 1647 frag = sc & IEEE80211_SCTL_FRAG; 1648 1649 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || 1650 is_multicast_ether_addr(hdr->addr1))) { 1651 /* not fragmented */ 1652 goto out; 1653 } 1654 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 1655 1656 if (skb_linearize(rx->skb)) 1657 return RX_DROP_UNUSABLE; 1658 1659 /* 1660 * skb_linearize() might change the skb->data and 1661 * previously cached variables (in this case, hdr) need to 1662 * be refreshed with the new data. 1663 */ 1664 hdr = (struct ieee80211_hdr *)rx->skb->data; 1665 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 1666 1667 if (frag == 0) { 1668 /* This is the first fragment of a new frame. */ 1669 entry = ieee80211_reassemble_add(rx->sdata, frag, seq, 1670 rx->seqno_idx, &(rx->skb)); 1671 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && 1672 ieee80211_has_protected(fc)) { 1673 int queue = rx->security_idx; 1674 /* Store CCMP PN so that we can verify that the next 1675 * fragment has a sequential PN value. */ 1676 entry->ccmp = 1; 1677 memcpy(entry->last_pn, 1678 rx->key->u.ccmp.rx_pn[queue], 1679 IEEE80211_CCMP_PN_LEN); 1680 } 1681 return RX_QUEUED; 1682 } 1683 1684 /* This is a fragment for a frame that should already be pending in 1685 * fragment cache. Add this fragment to the end of the pending entry. 1686 */ 1687 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, 1688 rx->seqno_idx, hdr); 1689 if (!entry) { 1690 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1691 return RX_DROP_MONITOR; 1692 } 1693 1694 /* Verify that MPDUs within one MSDU have sequential PN values. 1695 * (IEEE 802.11i, 8.3.3.4.5) */ 1696 if (entry->ccmp) { 1697 int i; 1698 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 1699 int queue; 1700 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) 1701 return RX_DROP_UNUSABLE; 1702 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 1703 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 1704 pn[i]++; 1705 if (pn[i]) 1706 break; 1707 } 1708 queue = rx->security_idx; 1709 rpn = rx->key->u.ccmp.rx_pn[queue]; 1710 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 1711 return RX_DROP_UNUSABLE; 1712 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 1713 } 1714 1715 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 1716 __skb_queue_tail(&entry->skb_list, rx->skb); 1717 entry->last_frag = frag; 1718 entry->extra_len += rx->skb->len; 1719 if (ieee80211_has_morefrags(fc)) { 1720 rx->skb = NULL; 1721 return RX_QUEUED; 1722 } 1723 1724 rx->skb = __skb_dequeue(&entry->skb_list); 1725 if (skb_tailroom(rx->skb) < entry->extra_len) { 1726 I802_DEBUG_INC(rx->local->rx_expand_skb_head2); 1727 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 1728 GFP_ATOMIC))) { 1729 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1730 __skb_queue_purge(&entry->skb_list); 1731 return RX_DROP_UNUSABLE; 1732 } 1733 } 1734 while ((skb = __skb_dequeue(&entry->skb_list))) { 1735 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); 1736 dev_kfree_skb(skb); 1737 } 1738 1739 /* Complete frame has been reassembled - process it now */ 1740 status = IEEE80211_SKB_RXCB(rx->skb); 1741 status->rx_flags |= IEEE80211_RX_FRAGMENTED; 1742 1743 out: 1744 if (rx->sta) 1745 rx->sta->rx_packets++; 1746 if (is_multicast_ether_addr(hdr->addr1)) 1747 rx->local->dot11MulticastReceivedFrameCount++; 1748 else 1749 ieee80211_led_rx(rx->local); 1750 return RX_CONTINUE; 1751 } 1752 1753 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 1754 { 1755 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 1756 return -EACCES; 1757 1758 return 0; 1759 } 1760 1761 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 1762 { 1763 struct sk_buff *skb = rx->skb; 1764 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1765 1766 /* 1767 * Pass through unencrypted frames if the hardware has 1768 * decrypted them already. 1769 */ 1770 if (status->flag & RX_FLAG_DECRYPTED) 1771 return 0; 1772 1773 /* Drop unencrypted frames if key is set. */ 1774 if (unlikely(!ieee80211_has_protected(fc) && 1775 !ieee80211_is_nullfunc(fc) && 1776 ieee80211_is_data(fc) && 1777 (rx->key || rx->sdata->drop_unencrypted))) 1778 return -EACCES; 1779 1780 return 0; 1781 } 1782 1783 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 1784 { 1785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1786 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1787 __le16 fc = hdr->frame_control; 1788 1789 /* 1790 * Pass through unencrypted frames if the hardware has 1791 * decrypted them already. 1792 */ 1793 if (status->flag & RX_FLAG_DECRYPTED) 1794 return 0; 1795 1796 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 1797 if (unlikely(!ieee80211_has_protected(fc) && 1798 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 1799 rx->key)) { 1800 if (ieee80211_is_deauth(fc) || 1801 ieee80211_is_disassoc(fc)) 1802 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1803 rx->skb->data, 1804 rx->skb->len); 1805 return -EACCES; 1806 } 1807 /* BIP does not use Protected field, so need to check MMIE */ 1808 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 1809 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 1810 if (ieee80211_is_deauth(fc) || 1811 ieee80211_is_disassoc(fc)) 1812 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1813 rx->skb->data, 1814 rx->skb->len); 1815 return -EACCES; 1816 } 1817 /* 1818 * When using MFP, Action frames are not allowed prior to 1819 * having configured keys. 1820 */ 1821 if (unlikely(ieee80211_is_action(fc) && !rx->key && 1822 ieee80211_is_robust_mgmt_frame( 1823 (struct ieee80211_hdr *) rx->skb->data))) 1824 return -EACCES; 1825 } 1826 1827 return 0; 1828 } 1829 1830 static int 1831 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 1832 { 1833 struct ieee80211_sub_if_data *sdata = rx->sdata; 1834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1835 bool check_port_control = false; 1836 struct ethhdr *ehdr; 1837 int ret; 1838 1839 *port_control = false; 1840 if (ieee80211_has_a4(hdr->frame_control) && 1841 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 1842 return -1; 1843 1844 if (sdata->vif.type == NL80211_IFTYPE_STATION && 1845 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 1846 1847 if (!sdata->u.mgd.use_4addr) 1848 return -1; 1849 else 1850 check_port_control = true; 1851 } 1852 1853 if (is_multicast_ether_addr(hdr->addr1) && 1854 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 1855 return -1; 1856 1857 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 1858 if (ret < 0) 1859 return ret; 1860 1861 ehdr = (struct ethhdr *) rx->skb->data; 1862 if (ehdr->h_proto == rx->sdata->control_port_protocol) 1863 *port_control = true; 1864 else if (check_port_control) 1865 return -1; 1866 1867 return 0; 1868 } 1869 1870 /* 1871 * requires that rx->skb is a frame with ethernet header 1872 */ 1873 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 1874 { 1875 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 1876 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 1877 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1878 1879 /* 1880 * Allow EAPOL frames to us/the PAE group address regardless 1881 * of whether the frame was encrypted or not. 1882 */ 1883 if (ehdr->h_proto == rx->sdata->control_port_protocol && 1884 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || 1885 ether_addr_equal(ehdr->h_dest, pae_group_addr))) 1886 return true; 1887 1888 if (ieee80211_802_1x_port_control(rx) || 1889 ieee80211_drop_unencrypted(rx, fc)) 1890 return false; 1891 1892 return true; 1893 } 1894 1895 /* 1896 * requires that rx->skb is a frame with ethernet header 1897 */ 1898 static void 1899 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 1900 { 1901 struct ieee80211_sub_if_data *sdata = rx->sdata; 1902 struct net_device *dev = sdata->dev; 1903 struct sk_buff *skb, *xmit_skb; 1904 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1905 struct sta_info *dsta; 1906 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1907 1908 skb = rx->skb; 1909 xmit_skb = NULL; 1910 1911 if ((sdata->vif.type == NL80211_IFTYPE_AP || 1912 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1913 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 1914 (status->rx_flags & IEEE80211_RX_RA_MATCH) && 1915 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 1916 if (is_multicast_ether_addr(ehdr->h_dest)) { 1917 /* 1918 * send multicast frames both to higher layers in 1919 * local net stack and back to the wireless medium 1920 */ 1921 xmit_skb = skb_copy(skb, GFP_ATOMIC); 1922 if (!xmit_skb) 1923 net_info_ratelimited("%s: failed to clone multicast frame\n", 1924 dev->name); 1925 } else { 1926 dsta = sta_info_get(sdata, skb->data); 1927 if (dsta) { 1928 /* 1929 * The destination station is associated to 1930 * this AP (in this VLAN), so send the frame 1931 * directly to it and do not pass it to local 1932 * net stack. 1933 */ 1934 xmit_skb = skb; 1935 skb = NULL; 1936 } 1937 } 1938 } 1939 1940 if (skb) { 1941 int align __maybe_unused; 1942 1943 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1944 /* 1945 * 'align' will only take the values 0 or 2 here 1946 * since all frames are required to be aligned 1947 * to 2-byte boundaries when being passed to 1948 * mac80211; the code here works just as well if 1949 * that isn't true, but mac80211 assumes it can 1950 * access fields as 2-byte aligned (e.g. for 1951 * compare_ether_addr) 1952 */ 1953 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; 1954 if (align) { 1955 if (WARN_ON(skb_headroom(skb) < 3)) { 1956 dev_kfree_skb(skb); 1957 skb = NULL; 1958 } else { 1959 u8 *data = skb->data; 1960 size_t len = skb_headlen(skb); 1961 skb->data -= align; 1962 memmove(skb->data, data, len); 1963 skb_set_tail_pointer(skb, len); 1964 } 1965 } 1966 #endif 1967 1968 if (skb) { 1969 /* deliver to local stack */ 1970 skb->protocol = eth_type_trans(skb, dev); 1971 memset(skb->cb, 0, sizeof(skb->cb)); 1972 netif_receive_skb(skb); 1973 } 1974 } 1975 1976 if (xmit_skb) { 1977 /* 1978 * Send to wireless media and increase priority by 256 to 1979 * keep the received priority instead of reclassifying 1980 * the frame (see cfg80211_classify8021d). 1981 */ 1982 xmit_skb->priority += 256; 1983 xmit_skb->protocol = htons(ETH_P_802_3); 1984 skb_reset_network_header(xmit_skb); 1985 skb_reset_mac_header(xmit_skb); 1986 dev_queue_xmit(xmit_skb); 1987 } 1988 } 1989 1990 static ieee80211_rx_result debug_noinline 1991 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 1992 { 1993 struct net_device *dev = rx->sdata->dev; 1994 struct sk_buff *skb = rx->skb; 1995 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1996 __le16 fc = hdr->frame_control; 1997 struct sk_buff_head frame_list; 1998 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1999 2000 if (unlikely(!ieee80211_is_data(fc))) 2001 return RX_CONTINUE; 2002 2003 if (unlikely(!ieee80211_is_data_present(fc))) 2004 return RX_DROP_MONITOR; 2005 2006 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 2007 return RX_CONTINUE; 2008 2009 if (ieee80211_has_a4(hdr->frame_control) && 2010 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2011 !rx->sdata->u.vlan.sta) 2012 return RX_DROP_UNUSABLE; 2013 2014 if (is_multicast_ether_addr(hdr->addr1) && 2015 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2016 rx->sdata->u.vlan.sta) || 2017 (rx->sdata->vif.type == NL80211_IFTYPE_STATION && 2018 rx->sdata->u.mgd.use_4addr))) 2019 return RX_DROP_UNUSABLE; 2020 2021 skb->dev = dev; 2022 __skb_queue_head_init(&frame_list); 2023 2024 if (skb_linearize(skb)) 2025 return RX_DROP_UNUSABLE; 2026 2027 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 2028 rx->sdata->vif.type, 2029 rx->local->hw.extra_tx_headroom, true); 2030 2031 while (!skb_queue_empty(&frame_list)) { 2032 rx->skb = __skb_dequeue(&frame_list); 2033 2034 if (!ieee80211_frame_allowed(rx, fc)) { 2035 dev_kfree_skb(rx->skb); 2036 continue; 2037 } 2038 dev->stats.rx_packets++; 2039 dev->stats.rx_bytes += rx->skb->len; 2040 2041 ieee80211_deliver_skb(rx); 2042 } 2043 2044 return RX_QUEUED; 2045 } 2046 2047 #ifdef CONFIG_MAC80211_MESH 2048 static ieee80211_rx_result 2049 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 2050 { 2051 struct ieee80211_hdr *fwd_hdr, *hdr; 2052 struct ieee80211_tx_info *info; 2053 struct ieee80211s_hdr *mesh_hdr; 2054 struct sk_buff *skb = rx->skb, *fwd_skb; 2055 struct ieee80211_local *local = rx->local; 2056 struct ieee80211_sub_if_data *sdata = rx->sdata; 2057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2058 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2059 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); 2060 u16 q, hdrlen; 2061 2062 hdr = (struct ieee80211_hdr *) skb->data; 2063 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2064 2065 /* make sure fixed part of mesh header is there, also checks skb len */ 2066 if (!pskb_may_pull(rx->skb, hdrlen + 6)) 2067 return RX_DROP_MONITOR; 2068 2069 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2070 2071 /* make sure full mesh header is there, also checks skb len */ 2072 if (!pskb_may_pull(rx->skb, 2073 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) 2074 return RX_DROP_MONITOR; 2075 2076 /* reload pointers */ 2077 hdr = (struct ieee80211_hdr *) skb->data; 2078 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2079 2080 /* frame is in RMC, don't forward */ 2081 if (ieee80211_is_data(hdr->frame_control) && 2082 is_multicast_ether_addr(hdr->addr1) && 2083 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) 2084 return RX_DROP_MONITOR; 2085 2086 if (!ieee80211_is_data(hdr->frame_control) || 2087 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2088 return RX_CONTINUE; 2089 2090 if (!mesh_hdr->ttl) 2091 return RX_DROP_MONITOR; 2092 2093 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2094 struct mesh_path *mppath; 2095 char *proxied_addr; 2096 char *mpp_addr; 2097 2098 if (is_multicast_ether_addr(hdr->addr1)) { 2099 mpp_addr = hdr->addr3; 2100 proxied_addr = mesh_hdr->eaddr1; 2101 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) { 2102 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2103 mpp_addr = hdr->addr4; 2104 proxied_addr = mesh_hdr->eaddr2; 2105 } else { 2106 return RX_DROP_MONITOR; 2107 } 2108 2109 rcu_read_lock(); 2110 mppath = mpp_path_lookup(sdata, proxied_addr); 2111 if (!mppath) { 2112 mpp_path_add(sdata, proxied_addr, mpp_addr); 2113 } else { 2114 spin_lock_bh(&mppath->state_lock); 2115 if (!ether_addr_equal(mppath->mpp, mpp_addr)) 2116 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 2117 spin_unlock_bh(&mppath->state_lock); 2118 } 2119 rcu_read_unlock(); 2120 } 2121 2122 /* Frame has reached destination. Don't forward */ 2123 if (!is_multicast_ether_addr(hdr->addr1) && 2124 ether_addr_equal(sdata->vif.addr, hdr->addr3)) 2125 return RX_CONTINUE; 2126 2127 q = ieee80211_select_queue_80211(sdata, skb, hdr); 2128 if (ieee80211_queue_stopped(&local->hw, q)) { 2129 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 2130 return RX_DROP_MONITOR; 2131 } 2132 skb_set_queue_mapping(skb, q); 2133 2134 if (!--mesh_hdr->ttl) { 2135 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2136 goto out; 2137 } 2138 2139 if (!ifmsh->mshcfg.dot11MeshForwarding) 2140 goto out; 2141 2142 fwd_skb = skb_copy(skb, GFP_ATOMIC); 2143 if (!fwd_skb) { 2144 net_info_ratelimited("%s: failed to clone mesh frame\n", 2145 sdata->name); 2146 goto out; 2147 } 2148 2149 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 2150 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); 2151 info = IEEE80211_SKB_CB(fwd_skb); 2152 memset(info, 0, sizeof(*info)); 2153 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 2154 info->control.vif = &rx->sdata->vif; 2155 info->control.jiffies = jiffies; 2156 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 2157 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2158 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2159 /* update power mode indication when forwarding */ 2160 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2161 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2162 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2163 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2164 } else { 2165 /* unable to resolve next hop */ 2166 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2167 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2); 2168 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 2169 kfree_skb(fwd_skb); 2170 return RX_DROP_MONITOR; 2171 } 2172 2173 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2174 ieee80211_add_pending_skb(local, fwd_skb); 2175 out: 2176 if (is_multicast_ether_addr(hdr->addr1) || 2177 sdata->dev->flags & IFF_PROMISC) 2178 return RX_CONTINUE; 2179 else 2180 return RX_DROP_MONITOR; 2181 } 2182 #endif 2183 2184 static ieee80211_rx_result debug_noinline 2185 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 2186 { 2187 struct ieee80211_sub_if_data *sdata = rx->sdata; 2188 struct ieee80211_local *local = rx->local; 2189 struct net_device *dev = sdata->dev; 2190 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2191 __le16 fc = hdr->frame_control; 2192 bool port_control; 2193 int err; 2194 2195 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 2196 return RX_CONTINUE; 2197 2198 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 2199 return RX_DROP_MONITOR; 2200 2201 /* 2202 * Send unexpected-4addr-frame event to hostapd. For older versions, 2203 * also drop the frame to cooked monitor interfaces. 2204 */ 2205 if (ieee80211_has_a4(hdr->frame_control) && 2206 sdata->vif.type == NL80211_IFTYPE_AP) { 2207 if (rx->sta && 2208 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 2209 cfg80211_rx_unexpected_4addr_frame( 2210 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 2211 return RX_DROP_MONITOR; 2212 } 2213 2214 err = __ieee80211_data_to_8023(rx, &port_control); 2215 if (unlikely(err)) 2216 return RX_DROP_UNUSABLE; 2217 2218 if (!ieee80211_frame_allowed(rx, fc)) 2219 return RX_DROP_MONITOR; 2220 2221 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2222 unlikely(port_control) && sdata->bss) { 2223 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2224 u.ap); 2225 dev = sdata->dev; 2226 rx->sdata = sdata; 2227 } 2228 2229 rx->skb->dev = dev; 2230 2231 dev->stats.rx_packets++; 2232 dev->stats.rx_bytes += rx->skb->len; 2233 2234 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 2235 !is_multicast_ether_addr( 2236 ((struct ethhdr *)rx->skb->data)->h_dest) && 2237 (!local->scanning && 2238 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { 2239 mod_timer(&local->dynamic_ps_timer, jiffies + 2240 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 2241 } 2242 2243 ieee80211_deliver_skb(rx); 2244 2245 return RX_QUEUED; 2246 } 2247 2248 static ieee80211_rx_result debug_noinline 2249 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 2250 { 2251 struct sk_buff *skb = rx->skb; 2252 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 2253 struct tid_ampdu_rx *tid_agg_rx; 2254 u16 start_seq_num; 2255 u16 tid; 2256 2257 if (likely(!ieee80211_is_ctl(bar->frame_control))) 2258 return RX_CONTINUE; 2259 2260 if (ieee80211_is_back_req(bar->frame_control)) { 2261 struct { 2262 __le16 control, start_seq_num; 2263 } __packed bar_data; 2264 2265 if (!rx->sta) 2266 return RX_DROP_MONITOR; 2267 2268 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 2269 &bar_data, sizeof(bar_data))) 2270 return RX_DROP_MONITOR; 2271 2272 tid = le16_to_cpu(bar_data.control) >> 12; 2273 2274 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 2275 if (!tid_agg_rx) 2276 return RX_DROP_MONITOR; 2277 2278 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 2279 2280 /* reset session timer */ 2281 if (tid_agg_rx->timeout) 2282 mod_timer(&tid_agg_rx->session_timer, 2283 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 2284 2285 spin_lock(&tid_agg_rx->reorder_lock); 2286 /* release stored frames up to start of BAR */ 2287 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 2288 start_seq_num, frames); 2289 spin_unlock(&tid_agg_rx->reorder_lock); 2290 2291 kfree_skb(skb); 2292 return RX_QUEUED; 2293 } 2294 2295 /* 2296 * After this point, we only want management frames, 2297 * so we can drop all remaining control frames to 2298 * cooked monitor interfaces. 2299 */ 2300 return RX_DROP_MONITOR; 2301 } 2302 2303 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 2304 struct ieee80211_mgmt *mgmt, 2305 size_t len) 2306 { 2307 struct ieee80211_local *local = sdata->local; 2308 struct sk_buff *skb; 2309 struct ieee80211_mgmt *resp; 2310 2311 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 2312 /* Not to own unicast address */ 2313 return; 2314 } 2315 2316 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || 2317 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { 2318 /* Not from the current AP or not associated yet. */ 2319 return; 2320 } 2321 2322 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 2323 /* Too short SA Query request frame */ 2324 return; 2325 } 2326 2327 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 2328 if (skb == NULL) 2329 return; 2330 2331 skb_reserve(skb, local->hw.extra_tx_headroom); 2332 resp = (struct ieee80211_mgmt *) skb_put(skb, 24); 2333 memset(resp, 0, 24); 2334 memcpy(resp->da, mgmt->sa, ETH_ALEN); 2335 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 2336 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 2337 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2338 IEEE80211_STYPE_ACTION); 2339 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 2340 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 2341 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 2342 memcpy(resp->u.action.u.sa_query.trans_id, 2343 mgmt->u.action.u.sa_query.trans_id, 2344 WLAN_SA_QUERY_TR_ID_LEN); 2345 2346 ieee80211_tx_skb(sdata, skb); 2347 } 2348 2349 static ieee80211_rx_result debug_noinline 2350 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 2351 { 2352 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2353 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2354 2355 /* 2356 * From here on, look only at management frames. 2357 * Data and control frames are already handled, 2358 * and unknown (reserved) frames are useless. 2359 */ 2360 if (rx->skb->len < 24) 2361 return RX_DROP_MONITOR; 2362 2363 if (!ieee80211_is_mgmt(mgmt->frame_control)) 2364 return RX_DROP_MONITOR; 2365 2366 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 2367 ieee80211_is_beacon(mgmt->frame_control) && 2368 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 2369 int sig = 0; 2370 2371 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 2372 sig = status->signal; 2373 2374 cfg80211_report_obss_beacon(rx->local->hw.wiphy, 2375 rx->skb->data, rx->skb->len, 2376 status->freq, sig); 2377 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 2378 } 2379 2380 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2381 return RX_DROP_MONITOR; 2382 2383 if (ieee80211_drop_unencrypted_mgmt(rx)) 2384 return RX_DROP_UNUSABLE; 2385 2386 return RX_CONTINUE; 2387 } 2388 2389 static ieee80211_rx_result debug_noinline 2390 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 2391 { 2392 struct ieee80211_local *local = rx->local; 2393 struct ieee80211_sub_if_data *sdata = rx->sdata; 2394 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2395 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2396 int len = rx->skb->len; 2397 2398 if (!ieee80211_is_action(mgmt->frame_control)) 2399 return RX_CONTINUE; 2400 2401 /* drop too small frames */ 2402 if (len < IEEE80211_MIN_ACTION_SIZE) 2403 return RX_DROP_UNUSABLE; 2404 2405 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 2406 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 2407 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 2408 return RX_DROP_UNUSABLE; 2409 2410 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2411 return RX_DROP_UNUSABLE; 2412 2413 switch (mgmt->u.action.category) { 2414 case WLAN_CATEGORY_HT: 2415 /* reject HT action frames from stations not supporting HT */ 2416 if (!rx->sta->sta.ht_cap.ht_supported) 2417 goto invalid; 2418 2419 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2420 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2421 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2422 sdata->vif.type != NL80211_IFTYPE_AP && 2423 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2424 break; 2425 2426 /* verify action & smps_control/chanwidth are present */ 2427 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 2428 goto invalid; 2429 2430 switch (mgmt->u.action.u.ht_smps.action) { 2431 case WLAN_HT_ACTION_SMPS: { 2432 struct ieee80211_supported_band *sband; 2433 enum ieee80211_smps_mode smps_mode; 2434 2435 /* convert to HT capability */ 2436 switch (mgmt->u.action.u.ht_smps.smps_control) { 2437 case WLAN_HT_SMPS_CONTROL_DISABLED: 2438 smps_mode = IEEE80211_SMPS_OFF; 2439 break; 2440 case WLAN_HT_SMPS_CONTROL_STATIC: 2441 smps_mode = IEEE80211_SMPS_STATIC; 2442 break; 2443 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 2444 smps_mode = IEEE80211_SMPS_DYNAMIC; 2445 break; 2446 default: 2447 goto invalid; 2448 } 2449 2450 /* if no change do nothing */ 2451 if (rx->sta->sta.smps_mode == smps_mode) 2452 goto handled; 2453 rx->sta->sta.smps_mode = smps_mode; 2454 2455 sband = rx->local->hw.wiphy->bands[status->band]; 2456 2457 rate_control_rate_update(local, sband, rx->sta, 2458 IEEE80211_RC_SMPS_CHANGED); 2459 goto handled; 2460 } 2461 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 2462 struct ieee80211_supported_band *sband; 2463 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 2464 enum ieee80211_sta_rx_bandwidth new_bw; 2465 2466 /* If it doesn't support 40 MHz it can't change ... */ 2467 if (!(rx->sta->sta.ht_cap.cap & 2468 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 2469 goto handled; 2470 2471 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 2472 new_bw = IEEE80211_STA_RX_BW_20; 2473 else 2474 new_bw = ieee80211_sta_cur_vht_bw(rx->sta); 2475 2476 if (rx->sta->sta.bandwidth == new_bw) 2477 goto handled; 2478 2479 sband = rx->local->hw.wiphy->bands[status->band]; 2480 2481 rate_control_rate_update(local, sband, rx->sta, 2482 IEEE80211_RC_BW_CHANGED); 2483 goto handled; 2484 } 2485 default: 2486 goto invalid; 2487 } 2488 2489 break; 2490 case WLAN_CATEGORY_PUBLIC: 2491 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2492 goto invalid; 2493 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2494 break; 2495 if (!rx->sta) 2496 break; 2497 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) 2498 break; 2499 if (mgmt->u.action.u.ext_chan_switch.action_code != 2500 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 2501 break; 2502 if (len < offsetof(struct ieee80211_mgmt, 2503 u.action.u.ext_chan_switch.variable)) 2504 goto invalid; 2505 goto queue; 2506 case WLAN_CATEGORY_VHT: 2507 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2508 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2509 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2510 sdata->vif.type != NL80211_IFTYPE_AP && 2511 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2512 break; 2513 2514 /* verify action code is present */ 2515 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2516 goto invalid; 2517 2518 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 2519 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 2520 u8 opmode; 2521 2522 /* verify opmode is present */ 2523 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 2524 goto invalid; 2525 2526 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 2527 2528 ieee80211_vht_handle_opmode(rx->sdata, rx->sta, 2529 opmode, status->band, 2530 false); 2531 goto handled; 2532 } 2533 default: 2534 break; 2535 } 2536 break; 2537 case WLAN_CATEGORY_BACK: 2538 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2539 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2540 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2541 sdata->vif.type != NL80211_IFTYPE_AP && 2542 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2543 break; 2544 2545 /* verify action_code is present */ 2546 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2547 break; 2548 2549 switch (mgmt->u.action.u.addba_req.action_code) { 2550 case WLAN_ACTION_ADDBA_REQ: 2551 if (len < (IEEE80211_MIN_ACTION_SIZE + 2552 sizeof(mgmt->u.action.u.addba_req))) 2553 goto invalid; 2554 break; 2555 case WLAN_ACTION_ADDBA_RESP: 2556 if (len < (IEEE80211_MIN_ACTION_SIZE + 2557 sizeof(mgmt->u.action.u.addba_resp))) 2558 goto invalid; 2559 break; 2560 case WLAN_ACTION_DELBA: 2561 if (len < (IEEE80211_MIN_ACTION_SIZE + 2562 sizeof(mgmt->u.action.u.delba))) 2563 goto invalid; 2564 break; 2565 default: 2566 goto invalid; 2567 } 2568 2569 goto queue; 2570 case WLAN_CATEGORY_SPECTRUM_MGMT: 2571 /* verify action_code is present */ 2572 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2573 break; 2574 2575 switch (mgmt->u.action.u.measurement.action_code) { 2576 case WLAN_ACTION_SPCT_MSR_REQ: 2577 if (status->band != IEEE80211_BAND_5GHZ) 2578 break; 2579 2580 if (len < (IEEE80211_MIN_ACTION_SIZE + 2581 sizeof(mgmt->u.action.u.measurement))) 2582 break; 2583 2584 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2585 break; 2586 2587 ieee80211_process_measurement_req(sdata, mgmt, len); 2588 goto handled; 2589 case WLAN_ACTION_SPCT_CHL_SWITCH: { 2590 u8 *bssid; 2591 if (len < (IEEE80211_MIN_ACTION_SIZE + 2592 sizeof(mgmt->u.action.u.chan_switch))) 2593 break; 2594 2595 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2596 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2597 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 2598 break; 2599 2600 if (sdata->vif.type == NL80211_IFTYPE_STATION) 2601 bssid = sdata->u.mgd.bssid; 2602 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 2603 bssid = sdata->u.ibss.bssid; 2604 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 2605 bssid = mgmt->sa; 2606 else 2607 break; 2608 2609 if (!ether_addr_equal(mgmt->bssid, bssid)) 2610 break; 2611 2612 goto queue; 2613 } 2614 } 2615 break; 2616 case WLAN_CATEGORY_SA_QUERY: 2617 if (len < (IEEE80211_MIN_ACTION_SIZE + 2618 sizeof(mgmt->u.action.u.sa_query))) 2619 break; 2620 2621 switch (mgmt->u.action.u.sa_query.action) { 2622 case WLAN_ACTION_SA_QUERY_REQUEST: 2623 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2624 break; 2625 ieee80211_process_sa_query_req(sdata, mgmt, len); 2626 goto handled; 2627 } 2628 break; 2629 case WLAN_CATEGORY_SELF_PROTECTED: 2630 if (len < (IEEE80211_MIN_ACTION_SIZE + 2631 sizeof(mgmt->u.action.u.self_prot.action_code))) 2632 break; 2633 2634 switch (mgmt->u.action.u.self_prot.action_code) { 2635 case WLAN_SP_MESH_PEERING_OPEN: 2636 case WLAN_SP_MESH_PEERING_CLOSE: 2637 case WLAN_SP_MESH_PEERING_CONFIRM: 2638 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2639 goto invalid; 2640 if (sdata->u.mesh.user_mpm) 2641 /* userspace handles this frame */ 2642 break; 2643 goto queue; 2644 case WLAN_SP_MGK_INFORM: 2645 case WLAN_SP_MGK_ACK: 2646 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2647 goto invalid; 2648 break; 2649 } 2650 break; 2651 case WLAN_CATEGORY_MESH_ACTION: 2652 if (len < (IEEE80211_MIN_ACTION_SIZE + 2653 sizeof(mgmt->u.action.u.mesh_action.action_code))) 2654 break; 2655 2656 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2657 break; 2658 if (mesh_action_is_path_sel(mgmt) && 2659 !mesh_path_sel_is_hwmp(sdata)) 2660 break; 2661 goto queue; 2662 } 2663 2664 return RX_CONTINUE; 2665 2666 invalid: 2667 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 2668 /* will return in the next handlers */ 2669 return RX_CONTINUE; 2670 2671 handled: 2672 if (rx->sta) 2673 rx->sta->rx_packets++; 2674 dev_kfree_skb(rx->skb); 2675 return RX_QUEUED; 2676 2677 queue: 2678 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2679 skb_queue_tail(&sdata->skb_queue, rx->skb); 2680 ieee80211_queue_work(&local->hw, &sdata->work); 2681 if (rx->sta) 2682 rx->sta->rx_packets++; 2683 return RX_QUEUED; 2684 } 2685 2686 static ieee80211_rx_result debug_noinline 2687 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 2688 { 2689 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2690 int sig = 0; 2691 2692 /* skip known-bad action frames and return them in the next handler */ 2693 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 2694 return RX_CONTINUE; 2695 2696 /* 2697 * Getting here means the kernel doesn't know how to handle 2698 * it, but maybe userspace does ... include returned frames 2699 * so userspace can register for those to know whether ones 2700 * it transmitted were processed or returned. 2701 */ 2702 2703 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 2704 sig = status->signal; 2705 2706 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig, 2707 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) { 2708 if (rx->sta) 2709 rx->sta->rx_packets++; 2710 dev_kfree_skb(rx->skb); 2711 return RX_QUEUED; 2712 } 2713 2714 return RX_CONTINUE; 2715 } 2716 2717 static ieee80211_rx_result debug_noinline 2718 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 2719 { 2720 struct ieee80211_local *local = rx->local; 2721 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2722 struct sk_buff *nskb; 2723 struct ieee80211_sub_if_data *sdata = rx->sdata; 2724 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2725 2726 if (!ieee80211_is_action(mgmt->frame_control)) 2727 return RX_CONTINUE; 2728 2729 /* 2730 * For AP mode, hostapd is responsible for handling any action 2731 * frames that we didn't handle, including returning unknown 2732 * ones. For all other modes we will return them to the sender, 2733 * setting the 0x80 bit in the action category, as required by 2734 * 802.11-2012 9.24.4. 2735 * Newer versions of hostapd shall also use the management frame 2736 * registration mechanisms, but older ones still use cooked 2737 * monitor interfaces so push all frames there. 2738 */ 2739 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 2740 (sdata->vif.type == NL80211_IFTYPE_AP || 2741 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 2742 return RX_DROP_MONITOR; 2743 2744 if (is_multicast_ether_addr(mgmt->da)) 2745 return RX_DROP_MONITOR; 2746 2747 /* do not return rejected action frames */ 2748 if (mgmt->u.action.category & 0x80) 2749 return RX_DROP_UNUSABLE; 2750 2751 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 2752 GFP_ATOMIC); 2753 if (nskb) { 2754 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 2755 2756 nmgmt->u.action.category |= 0x80; 2757 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 2758 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 2759 2760 memset(nskb->cb, 0, sizeof(nskb->cb)); 2761 2762 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 2763 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 2764 2765 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 2766 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 2767 IEEE80211_TX_CTL_NO_CCK_RATE; 2768 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 2769 info->hw_queue = 2770 local->hw.offchannel_tx_hw_queue; 2771 } 2772 2773 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, 2774 status->band); 2775 } 2776 dev_kfree_skb(rx->skb); 2777 return RX_QUEUED; 2778 } 2779 2780 static ieee80211_rx_result debug_noinline 2781 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 2782 { 2783 struct ieee80211_sub_if_data *sdata = rx->sdata; 2784 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2785 __le16 stype; 2786 2787 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 2788 2789 if (!ieee80211_vif_is_mesh(&sdata->vif) && 2790 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2791 sdata->vif.type != NL80211_IFTYPE_STATION) 2792 return RX_DROP_MONITOR; 2793 2794 switch (stype) { 2795 case cpu_to_le16(IEEE80211_STYPE_AUTH): 2796 case cpu_to_le16(IEEE80211_STYPE_BEACON): 2797 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 2798 /* process for all: mesh, mlme, ibss */ 2799 break; 2800 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 2801 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 2802 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 2803 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 2804 if (is_multicast_ether_addr(mgmt->da) && 2805 !is_broadcast_ether_addr(mgmt->da)) 2806 return RX_DROP_MONITOR; 2807 2808 /* process only for station */ 2809 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2810 return RX_DROP_MONITOR; 2811 break; 2812 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 2813 /* process only for ibss and mesh */ 2814 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 2815 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 2816 return RX_DROP_MONITOR; 2817 break; 2818 default: 2819 return RX_DROP_MONITOR; 2820 } 2821 2822 /* queue up frame and kick off work to process it */ 2823 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2824 skb_queue_tail(&sdata->skb_queue, rx->skb); 2825 ieee80211_queue_work(&rx->local->hw, &sdata->work); 2826 if (rx->sta) 2827 rx->sta->rx_packets++; 2828 2829 return RX_QUEUED; 2830 } 2831 2832 /* TODO: use IEEE80211_RX_FRAGMENTED */ 2833 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 2834 struct ieee80211_rate *rate) 2835 { 2836 struct ieee80211_sub_if_data *sdata; 2837 struct ieee80211_local *local = rx->local; 2838 struct sk_buff *skb = rx->skb, *skb2; 2839 struct net_device *prev_dev = NULL; 2840 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2841 int needed_headroom; 2842 2843 /* 2844 * If cooked monitor has been processed already, then 2845 * don't do it again. If not, set the flag. 2846 */ 2847 if (rx->flags & IEEE80211_RX_CMNTR) 2848 goto out_free_skb; 2849 rx->flags |= IEEE80211_RX_CMNTR; 2850 2851 /* If there are no cooked monitor interfaces, just free the SKB */ 2852 if (!local->cooked_mntrs) 2853 goto out_free_skb; 2854 2855 /* room for the radiotap header based on driver features */ 2856 needed_headroom = ieee80211_rx_radiotap_space(local, status); 2857 2858 if (skb_headroom(skb) < needed_headroom && 2859 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) 2860 goto out_free_skb; 2861 2862 /* prepend radiotap information */ 2863 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 2864 false); 2865 2866 skb_set_mac_header(skb, 0); 2867 skb->ip_summed = CHECKSUM_UNNECESSARY; 2868 skb->pkt_type = PACKET_OTHERHOST; 2869 skb->protocol = htons(ETH_P_802_2); 2870 2871 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2872 if (!ieee80211_sdata_running(sdata)) 2873 continue; 2874 2875 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 2876 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) 2877 continue; 2878 2879 if (prev_dev) { 2880 skb2 = skb_clone(skb, GFP_ATOMIC); 2881 if (skb2) { 2882 skb2->dev = prev_dev; 2883 netif_receive_skb(skb2); 2884 } 2885 } 2886 2887 prev_dev = sdata->dev; 2888 sdata->dev->stats.rx_packets++; 2889 sdata->dev->stats.rx_bytes += skb->len; 2890 } 2891 2892 if (prev_dev) { 2893 skb->dev = prev_dev; 2894 netif_receive_skb(skb); 2895 return; 2896 } 2897 2898 out_free_skb: 2899 dev_kfree_skb(skb); 2900 } 2901 2902 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 2903 ieee80211_rx_result res) 2904 { 2905 switch (res) { 2906 case RX_DROP_MONITOR: 2907 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2908 if (rx->sta) 2909 rx->sta->rx_dropped++; 2910 /* fall through */ 2911 case RX_CONTINUE: { 2912 struct ieee80211_rate *rate = NULL; 2913 struct ieee80211_supported_band *sband; 2914 struct ieee80211_rx_status *status; 2915 2916 status = IEEE80211_SKB_RXCB((rx->skb)); 2917 2918 sband = rx->local->hw.wiphy->bands[status->band]; 2919 if (!(status->flag & RX_FLAG_HT) && 2920 !(status->flag & RX_FLAG_VHT)) 2921 rate = &sband->bitrates[status->rate_idx]; 2922 2923 ieee80211_rx_cooked_monitor(rx, rate); 2924 break; 2925 } 2926 case RX_DROP_UNUSABLE: 2927 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2928 if (rx->sta) 2929 rx->sta->rx_dropped++; 2930 dev_kfree_skb(rx->skb); 2931 break; 2932 case RX_QUEUED: 2933 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 2934 break; 2935 } 2936 } 2937 2938 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 2939 struct sk_buff_head *frames) 2940 { 2941 ieee80211_rx_result res = RX_DROP_MONITOR; 2942 struct sk_buff *skb; 2943 2944 #define CALL_RXH(rxh) \ 2945 do { \ 2946 res = rxh(rx); \ 2947 if (res != RX_CONTINUE) \ 2948 goto rxh_next; \ 2949 } while (0); 2950 2951 spin_lock_bh(&rx->local->rx_path_lock); 2952 2953 while ((skb = __skb_dequeue(frames))) { 2954 /* 2955 * all the other fields are valid across frames 2956 * that belong to an aMPDU since they are on the 2957 * same TID from the same station 2958 */ 2959 rx->skb = skb; 2960 2961 CALL_RXH(ieee80211_rx_h_check_more_data) 2962 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) 2963 CALL_RXH(ieee80211_rx_h_sta_process) 2964 CALL_RXH(ieee80211_rx_h_decrypt) 2965 CALL_RXH(ieee80211_rx_h_defragment) 2966 CALL_RXH(ieee80211_rx_h_michael_mic_verify) 2967 /* must be after MMIC verify so header is counted in MPDU mic */ 2968 #ifdef CONFIG_MAC80211_MESH 2969 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 2970 CALL_RXH(ieee80211_rx_h_mesh_fwding); 2971 #endif 2972 CALL_RXH(ieee80211_rx_h_amsdu) 2973 CALL_RXH(ieee80211_rx_h_data) 2974 2975 /* special treatment -- needs the queue */ 2976 res = ieee80211_rx_h_ctrl(rx, frames); 2977 if (res != RX_CONTINUE) 2978 goto rxh_next; 2979 2980 CALL_RXH(ieee80211_rx_h_mgmt_check) 2981 CALL_RXH(ieee80211_rx_h_action) 2982 CALL_RXH(ieee80211_rx_h_userspace_mgmt) 2983 CALL_RXH(ieee80211_rx_h_action_return) 2984 CALL_RXH(ieee80211_rx_h_mgmt) 2985 2986 rxh_next: 2987 ieee80211_rx_handlers_result(rx, res); 2988 2989 #undef CALL_RXH 2990 } 2991 2992 spin_unlock_bh(&rx->local->rx_path_lock); 2993 } 2994 2995 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 2996 { 2997 struct sk_buff_head reorder_release; 2998 ieee80211_rx_result res = RX_DROP_MONITOR; 2999 3000 __skb_queue_head_init(&reorder_release); 3001 3002 #define CALL_RXH(rxh) \ 3003 do { \ 3004 res = rxh(rx); \ 3005 if (res != RX_CONTINUE) \ 3006 goto rxh_next; \ 3007 } while (0); 3008 3009 CALL_RXH(ieee80211_rx_h_check) 3010 3011 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 3012 3013 ieee80211_rx_handlers(rx, &reorder_release); 3014 return; 3015 3016 rxh_next: 3017 ieee80211_rx_handlers_result(rx, res); 3018 3019 #undef CALL_RXH 3020 } 3021 3022 /* 3023 * This function makes calls into the RX path, therefore 3024 * it has to be invoked under RCU read lock. 3025 */ 3026 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 3027 { 3028 struct sk_buff_head frames; 3029 struct ieee80211_rx_data rx = { 3030 .sta = sta, 3031 .sdata = sta->sdata, 3032 .local = sta->local, 3033 /* This is OK -- must be QoS data frame */ 3034 .security_idx = tid, 3035 .seqno_idx = tid, 3036 .flags = 0, 3037 }; 3038 struct tid_ampdu_rx *tid_agg_rx; 3039 3040 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3041 if (!tid_agg_rx) 3042 return; 3043 3044 __skb_queue_head_init(&frames); 3045 3046 spin_lock(&tid_agg_rx->reorder_lock); 3047 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 3048 spin_unlock(&tid_agg_rx->reorder_lock); 3049 3050 ieee80211_rx_handlers(&rx, &frames); 3051 } 3052 3053 /* main receive path */ 3054 3055 static int prepare_for_handlers(struct ieee80211_rx_data *rx, 3056 struct ieee80211_hdr *hdr) 3057 { 3058 struct ieee80211_sub_if_data *sdata = rx->sdata; 3059 struct sk_buff *skb = rx->skb; 3060 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3061 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 3062 int multicast = is_multicast_ether_addr(hdr->addr1); 3063 3064 switch (sdata->vif.type) { 3065 case NL80211_IFTYPE_STATION: 3066 if (!bssid && !sdata->u.mgd.use_4addr) 3067 return 0; 3068 if (!multicast && 3069 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { 3070 if (!(sdata->dev->flags & IFF_PROMISC) || 3071 sdata->u.mgd.use_4addr) 3072 return 0; 3073 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3074 } 3075 break; 3076 case NL80211_IFTYPE_ADHOC: 3077 if (!bssid) 3078 return 0; 3079 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 3080 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) 3081 return 0; 3082 if (ieee80211_is_beacon(hdr->frame_control)) { 3083 return 1; 3084 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { 3085 return 0; 3086 } else if (!multicast && 3087 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { 3088 if (!(sdata->dev->flags & IFF_PROMISC)) 3089 return 0; 3090 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3091 } else if (!rx->sta) { 3092 int rate_idx; 3093 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) 3094 rate_idx = 0; /* TODO: HT/VHT rates */ 3095 else 3096 rate_idx = status->rate_idx; 3097 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 3098 BIT(rate_idx)); 3099 } 3100 break; 3101 case NL80211_IFTYPE_MESH_POINT: 3102 if (!multicast && 3103 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { 3104 if (!(sdata->dev->flags & IFF_PROMISC)) 3105 return 0; 3106 3107 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3108 } 3109 break; 3110 case NL80211_IFTYPE_AP_VLAN: 3111 case NL80211_IFTYPE_AP: 3112 if (!bssid) { 3113 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3114 return 0; 3115 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { 3116 /* 3117 * Accept public action frames even when the 3118 * BSSID doesn't match, this is used for P2P 3119 * and location updates. Note that mac80211 3120 * itself never looks at these frames. 3121 */ 3122 if (!multicast && 3123 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3124 return 0; 3125 if (ieee80211_is_public_action(hdr, skb->len)) 3126 return 1; 3127 if (!ieee80211_is_beacon(hdr->frame_control)) 3128 return 0; 3129 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3130 } 3131 break; 3132 case NL80211_IFTYPE_WDS: 3133 if (bssid || !ieee80211_is_data(hdr->frame_control)) 3134 return 0; 3135 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2)) 3136 return 0; 3137 break; 3138 case NL80211_IFTYPE_P2P_DEVICE: 3139 if (!ieee80211_is_public_action(hdr, skb->len) && 3140 !ieee80211_is_probe_req(hdr->frame_control) && 3141 !ieee80211_is_probe_resp(hdr->frame_control) && 3142 !ieee80211_is_beacon(hdr->frame_control)) 3143 return 0; 3144 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) && 3145 !multicast) 3146 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3147 break; 3148 default: 3149 /* should never get here */ 3150 WARN_ON_ONCE(1); 3151 break; 3152 } 3153 3154 return 1; 3155 } 3156 3157 /* 3158 * This function returns whether or not the SKB 3159 * was destined for RX processing or not, which, 3160 * if consume is true, is equivalent to whether 3161 * or not the skb was consumed. 3162 */ 3163 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 3164 struct sk_buff *skb, bool consume) 3165 { 3166 struct ieee80211_local *local = rx->local; 3167 struct ieee80211_sub_if_data *sdata = rx->sdata; 3168 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3169 struct ieee80211_hdr *hdr = (void *)skb->data; 3170 int prepares; 3171 3172 rx->skb = skb; 3173 status->rx_flags |= IEEE80211_RX_RA_MATCH; 3174 prepares = prepare_for_handlers(rx, hdr); 3175 3176 if (!prepares) 3177 return false; 3178 3179 if (!consume) { 3180 skb = skb_copy(skb, GFP_ATOMIC); 3181 if (!skb) { 3182 if (net_ratelimit()) 3183 wiphy_debug(local->hw.wiphy, 3184 "failed to copy skb for %s\n", 3185 sdata->name); 3186 return true; 3187 } 3188 3189 rx->skb = skb; 3190 } 3191 3192 ieee80211_invoke_rx_handlers(rx); 3193 return true; 3194 } 3195 3196 /* 3197 * This is the actual Rx frames handler. as it blongs to Rx path it must 3198 * be called with rcu_read_lock protection. 3199 */ 3200 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 3201 struct sk_buff *skb) 3202 { 3203 struct ieee80211_local *local = hw_to_local(hw); 3204 struct ieee80211_sub_if_data *sdata; 3205 struct ieee80211_hdr *hdr; 3206 __le16 fc; 3207 struct ieee80211_rx_data rx; 3208 struct ieee80211_sub_if_data *prev; 3209 struct sta_info *sta, *tmp, *prev_sta; 3210 int err = 0; 3211 3212 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 3213 memset(&rx, 0, sizeof(rx)); 3214 rx.skb = skb; 3215 rx.local = local; 3216 3217 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 3218 local->dot11ReceivedFragmentCount++; 3219 3220 if (ieee80211_is_mgmt(fc)) { 3221 /* drop frame if too short for header */ 3222 if (skb->len < ieee80211_hdrlen(fc)) 3223 err = -ENOBUFS; 3224 else 3225 err = skb_linearize(skb); 3226 } else { 3227 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 3228 } 3229 3230 if (err) { 3231 dev_kfree_skb(skb); 3232 return; 3233 } 3234 3235 hdr = (struct ieee80211_hdr *)skb->data; 3236 ieee80211_parse_qos(&rx); 3237 ieee80211_verify_alignment(&rx); 3238 3239 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 3240 ieee80211_is_beacon(hdr->frame_control))) 3241 ieee80211_scan_rx(local, skb); 3242 3243 if (ieee80211_is_data(fc)) { 3244 prev_sta = NULL; 3245 3246 for_each_sta_info(local, hdr->addr2, sta, tmp) { 3247 if (!prev_sta) { 3248 prev_sta = sta; 3249 continue; 3250 } 3251 3252 rx.sta = prev_sta; 3253 rx.sdata = prev_sta->sdata; 3254 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3255 3256 prev_sta = sta; 3257 } 3258 3259 if (prev_sta) { 3260 rx.sta = prev_sta; 3261 rx.sdata = prev_sta->sdata; 3262 3263 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3264 return; 3265 goto out; 3266 } 3267 } 3268 3269 prev = NULL; 3270 3271 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3272 if (!ieee80211_sdata_running(sdata)) 3273 continue; 3274 3275 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 3276 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3277 continue; 3278 3279 /* 3280 * frame is destined for this interface, but if it's 3281 * not also for the previous one we handle that after 3282 * the loop to avoid copying the SKB once too much 3283 */ 3284 3285 if (!prev) { 3286 prev = sdata; 3287 continue; 3288 } 3289 3290 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3291 rx.sdata = prev; 3292 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3293 3294 prev = sdata; 3295 } 3296 3297 if (prev) { 3298 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3299 rx.sdata = prev; 3300 3301 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3302 return; 3303 } 3304 3305 out: 3306 dev_kfree_skb(skb); 3307 } 3308 3309 /* 3310 * This is the receive path handler. It is called by a low level driver when an 3311 * 802.11 MPDU is received from the hardware. 3312 */ 3313 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) 3314 { 3315 struct ieee80211_local *local = hw_to_local(hw); 3316 struct ieee80211_rate *rate = NULL; 3317 struct ieee80211_supported_band *sband; 3318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3319 3320 WARN_ON_ONCE(softirq_count() == 0); 3321 3322 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS)) 3323 goto drop; 3324 3325 sband = local->hw.wiphy->bands[status->band]; 3326 if (WARN_ON(!sband)) 3327 goto drop; 3328 3329 /* 3330 * If we're suspending, it is possible although not too likely 3331 * that we'd be receiving frames after having already partially 3332 * quiesced the stack. We can't process such frames then since 3333 * that might, for example, cause stations to be added or other 3334 * driver callbacks be invoked. 3335 */ 3336 if (unlikely(local->quiescing || local->suspended)) 3337 goto drop; 3338 3339 /* We might be during a HW reconfig, prevent Rx for the same reason */ 3340 if (unlikely(local->in_reconfig)) 3341 goto drop; 3342 3343 /* 3344 * The same happens when we're not even started, 3345 * but that's worth a warning. 3346 */ 3347 if (WARN_ON(!local->started)) 3348 goto drop; 3349 3350 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 3351 /* 3352 * Validate the rate, unless a PLCP error means that 3353 * we probably can't have a valid rate here anyway. 3354 */ 3355 3356 if (status->flag & RX_FLAG_HT) { 3357 /* 3358 * rate_idx is MCS index, which can be [0-76] 3359 * as documented on: 3360 * 3361 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 3362 * 3363 * Anything else would be some sort of driver or 3364 * hardware error. The driver should catch hardware 3365 * errors. 3366 */ 3367 if (WARN(status->rate_idx > 76, 3368 "Rate marked as an HT rate but passed " 3369 "status->rate_idx is not " 3370 "an MCS index [0-76]: %d (0x%02x)\n", 3371 status->rate_idx, 3372 status->rate_idx)) 3373 goto drop; 3374 } else if (status->flag & RX_FLAG_VHT) { 3375 if (WARN_ONCE(status->rate_idx > 9 || 3376 !status->vht_nss || 3377 status->vht_nss > 8, 3378 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 3379 status->rate_idx, status->vht_nss)) 3380 goto drop; 3381 } else { 3382 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 3383 goto drop; 3384 rate = &sband->bitrates[status->rate_idx]; 3385 } 3386 } 3387 3388 status->rx_flags = 0; 3389 3390 /* 3391 * key references and virtual interfaces are protected using RCU 3392 * and this requires that we are in a read-side RCU section during 3393 * receive processing 3394 */ 3395 rcu_read_lock(); 3396 3397 /* 3398 * Frames with failed FCS/PLCP checksum are not returned, 3399 * all other frames are returned without radiotap header 3400 * if it was previously present. 3401 * Also, frames with less than 16 bytes are dropped. 3402 */ 3403 skb = ieee80211_rx_monitor(local, skb, rate); 3404 if (!skb) { 3405 rcu_read_unlock(); 3406 return; 3407 } 3408 3409 ieee80211_tpt_led_trig_rx(local, 3410 ((struct ieee80211_hdr *)skb->data)->frame_control, 3411 skb->len); 3412 __ieee80211_rx_handle_packet(hw, skb); 3413 3414 rcu_read_unlock(); 3415 3416 return; 3417 drop: 3418 kfree_skb(skb); 3419 } 3420 EXPORT_SYMBOL(ieee80211_rx); 3421 3422 /* This is a version of the rx handler that can be called from hard irq 3423 * context. Post the skb on the queue and schedule the tasklet */ 3424 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 3425 { 3426 struct ieee80211_local *local = hw_to_local(hw); 3427 3428 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 3429 3430 skb->pkt_type = IEEE80211_RX_MSG; 3431 skb_queue_tail(&local->skb_queue, skb); 3432 tasklet_schedule(&local->tasklet); 3433 } 3434 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 3435