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 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { 44 if (likely(skb->len > FCS_LEN)) 45 __pskb_trim(skb, skb->len - FCS_LEN); 46 else { 47 /* driver bug */ 48 WARN_ON(1); 49 dev_kfree_skb(skb); 50 return NULL; 51 } 52 } 53 54 return skb; 55 } 56 57 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len) 58 { 59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 60 struct ieee80211_hdr *hdr = (void *)skb->data; 61 62 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 63 RX_FLAG_FAILED_PLCP_CRC | 64 RX_FLAG_AMPDU_IS_ZEROLEN)) 65 return true; 66 67 if (unlikely(skb->len < 16 + present_fcs_len)) 68 return true; 69 70 if (ieee80211_is_ctl(hdr->frame_control) && 71 !ieee80211_is_pspoll(hdr->frame_control) && 72 !ieee80211_is_back_req(hdr->frame_control)) 73 return true; 74 75 return false; 76 } 77 78 static int 79 ieee80211_rx_radiotap_space(struct ieee80211_local *local, 80 struct ieee80211_rx_status *status) 81 { 82 int len; 83 84 /* always present fields */ 85 len = sizeof(struct ieee80211_radiotap_header) + 8; 86 87 /* allocate extra bitmaps */ 88 if (status->chains) 89 len += 4 * hweight8(status->chains); 90 91 if (ieee80211_have_rx_timestamp(status)) { 92 len = ALIGN(len, 8); 93 len += 8; 94 } 95 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 96 len += 1; 97 98 /* antenna field, if we don't have per-chain info */ 99 if (!status->chains) 100 len += 1; 101 102 /* padding for RX_FLAGS if necessary */ 103 len = ALIGN(len, 2); 104 105 if (status->flag & RX_FLAG_HT) /* HT info */ 106 len += 3; 107 108 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 109 len = ALIGN(len, 4); 110 len += 8; 111 } 112 113 if (status->flag & RX_FLAG_VHT) { 114 len = ALIGN(len, 2); 115 len += 12; 116 } 117 118 if (status->chains) { 119 /* antenna and antenna signal fields */ 120 len += 2 * hweight8(status->chains); 121 } 122 123 return len; 124 } 125 126 /* 127 * ieee80211_add_rx_radiotap_header - add radiotap header 128 * 129 * add a radiotap header containing all the fields which the hardware provided. 130 */ 131 static void 132 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 133 struct sk_buff *skb, 134 struct ieee80211_rate *rate, 135 int rtap_len, bool has_fcs) 136 { 137 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 138 struct ieee80211_radiotap_header *rthdr; 139 unsigned char *pos; 140 __le32 *it_present; 141 u32 it_present_val; 142 u16 rx_flags = 0; 143 u16 channel_flags = 0; 144 int mpdulen, chain; 145 unsigned long chains = status->chains; 146 147 mpdulen = skb->len; 148 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))) 149 mpdulen += FCS_LEN; 150 151 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); 152 memset(rthdr, 0, rtap_len); 153 it_present = &rthdr->it_present; 154 155 /* radiotap header, set always present flags */ 156 rthdr->it_len = cpu_to_le16(rtap_len); 157 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 158 BIT(IEEE80211_RADIOTAP_CHANNEL) | 159 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 160 161 if (!status->chains) 162 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 163 164 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 165 it_present_val |= 166 BIT(IEEE80211_RADIOTAP_EXT) | 167 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 168 put_unaligned_le32(it_present_val, it_present); 169 it_present++; 170 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 171 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 172 } 173 174 put_unaligned_le32(it_present_val, it_present); 175 176 pos = (void *)(it_present + 1); 177 178 /* the order of the following fields is important */ 179 180 /* IEEE80211_RADIOTAP_TSFT */ 181 if (ieee80211_have_rx_timestamp(status)) { 182 /* padding */ 183 while ((pos - (u8 *)rthdr) & 7) 184 *pos++ = 0; 185 put_unaligned_le64( 186 ieee80211_calculate_rx_timestamp(local, status, 187 mpdulen, 0), 188 pos); 189 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 190 pos += 8; 191 } 192 193 /* IEEE80211_RADIOTAP_FLAGS */ 194 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)) 195 *pos |= IEEE80211_RADIOTAP_F_FCS; 196 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 197 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 198 if (status->flag & RX_FLAG_SHORTPRE) 199 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 200 pos++; 201 202 /* IEEE80211_RADIOTAP_RATE */ 203 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) { 204 /* 205 * Without rate information don't add it. If we have, 206 * MCS information is a separate field in radiotap, 207 * added below. The byte here is needed as padding 208 * for the channel though, so initialise it to 0. 209 */ 210 *pos = 0; 211 } else { 212 int shift = 0; 213 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 214 if (status->flag & RX_FLAG_10MHZ) 215 shift = 1; 216 else if (status->flag & RX_FLAG_5MHZ) 217 shift = 2; 218 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 219 } 220 pos++; 221 222 /* IEEE80211_RADIOTAP_CHANNEL */ 223 put_unaligned_le16(status->freq, pos); 224 pos += 2; 225 if (status->flag & RX_FLAG_10MHZ) 226 channel_flags |= IEEE80211_CHAN_HALF; 227 else if (status->flag & RX_FLAG_5MHZ) 228 channel_flags |= IEEE80211_CHAN_QUARTER; 229 230 if (status->band == IEEE80211_BAND_5GHZ) 231 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 232 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) 233 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 234 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 235 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 236 else if (rate) 237 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 238 else 239 channel_flags |= IEEE80211_CHAN_2GHZ; 240 put_unaligned_le16(channel_flags, pos); 241 pos += 2; 242 243 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 244 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM && 245 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 246 *pos = status->signal; 247 rthdr->it_present |= 248 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 249 pos++; 250 } 251 252 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 253 254 if (!status->chains) { 255 /* IEEE80211_RADIOTAP_ANTENNA */ 256 *pos = status->antenna; 257 pos++; 258 } 259 260 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 261 262 /* IEEE80211_RADIOTAP_RX_FLAGS */ 263 /* ensure 2 byte alignment for the 2 byte field as required */ 264 if ((pos - (u8 *)rthdr) & 1) 265 *pos++ = 0; 266 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 267 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 268 put_unaligned_le16(rx_flags, pos); 269 pos += 2; 270 271 if (status->flag & RX_FLAG_HT) { 272 unsigned int stbc; 273 274 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 275 *pos++ = local->hw.radiotap_mcs_details; 276 *pos = 0; 277 if (status->flag & RX_FLAG_SHORT_GI) 278 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 279 if (status->flag & RX_FLAG_40MHZ) 280 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 281 if (status->flag & RX_FLAG_HT_GF) 282 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 283 if (status->flag & RX_FLAG_LDPC) 284 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 285 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT; 286 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 287 pos++; 288 *pos++ = status->rate_idx; 289 } 290 291 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 292 u16 flags = 0; 293 294 /* ensure 4 byte alignment */ 295 while ((pos - (u8 *)rthdr) & 3) 296 pos++; 297 rthdr->it_present |= 298 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); 299 put_unaligned_le32(status->ampdu_reference, pos); 300 pos += 4; 301 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN) 302 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN; 303 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN) 304 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN; 305 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 306 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 307 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 308 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 309 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 310 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 311 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 312 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; 313 put_unaligned_le16(flags, pos); 314 pos += 2; 315 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 316 *pos++ = status->ampdu_delimiter_crc; 317 else 318 *pos++ = 0; 319 *pos++ = 0; 320 } 321 322 if (status->flag & RX_FLAG_VHT) { 323 u16 known = local->hw.radiotap_vht_details; 324 325 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 326 /* known field - how to handle 80+80? */ 327 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ) 328 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 329 put_unaligned_le16(known, pos); 330 pos += 2; 331 /* flags */ 332 if (status->flag & RX_FLAG_SHORT_GI) 333 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 334 /* in VHT, STBC is binary */ 335 if (status->flag & RX_FLAG_STBC_MASK) 336 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 337 if (status->vht_flag & RX_VHT_FLAG_BF) 338 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 339 pos++; 340 /* bandwidth */ 341 if (status->vht_flag & RX_VHT_FLAG_80MHZ) 342 *pos++ = 4; 343 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ) 344 *pos++ = 0; /* marked not known above */ 345 else if (status->vht_flag & RX_VHT_FLAG_160MHZ) 346 *pos++ = 11; 347 else if (status->flag & RX_FLAG_40MHZ) 348 *pos++ = 1; 349 else /* 20 MHz */ 350 *pos++ = 0; 351 /* MCS/NSS */ 352 *pos = (status->rate_idx << 4) | status->vht_nss; 353 pos += 4; 354 /* coding field */ 355 if (status->flag & RX_FLAG_LDPC) 356 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 357 pos++; 358 /* group ID */ 359 pos++; 360 /* partial_aid */ 361 pos += 2; 362 } 363 364 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 365 *pos++ = status->chain_signal[chain]; 366 *pos++ = chain; 367 } 368 } 369 370 /* 371 * This function copies a received frame to all monitor interfaces and 372 * returns a cleaned-up SKB that no longer includes the FCS nor the 373 * radiotap header the driver might have added. 374 */ 375 static struct sk_buff * 376 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 377 struct ieee80211_rate *rate) 378 { 379 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 380 struct ieee80211_sub_if_data *sdata; 381 int needed_headroom; 382 struct sk_buff *skb, *skb2; 383 struct net_device *prev_dev = NULL; 384 int present_fcs_len = 0; 385 386 /* 387 * First, we may need to make a copy of the skb because 388 * (1) we need to modify it for radiotap (if not present), and 389 * (2) the other RX handlers will modify the skb we got. 390 * 391 * We don't need to, of course, if we aren't going to return 392 * the SKB because it has a bad FCS/PLCP checksum. 393 */ 394 395 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 396 present_fcs_len = FCS_LEN; 397 398 /* ensure hdr->frame_control is in skb head */ 399 if (!pskb_may_pull(origskb, 2)) { 400 dev_kfree_skb(origskb); 401 return NULL; 402 } 403 404 if (!local->monitors) { 405 if (should_drop_frame(origskb, present_fcs_len)) { 406 dev_kfree_skb(origskb); 407 return NULL; 408 } 409 410 return remove_monitor_info(local, origskb); 411 } 412 413 /* room for the radiotap header based on driver features */ 414 needed_headroom = ieee80211_rx_radiotap_space(local, status); 415 416 if (should_drop_frame(origskb, present_fcs_len)) { 417 /* only need to expand headroom if necessary */ 418 skb = origskb; 419 origskb = NULL; 420 421 /* 422 * This shouldn't trigger often because most devices have an 423 * RX header they pull before we get here, and that should 424 * be big enough for our radiotap information. We should 425 * probably export the length to drivers so that we can have 426 * them allocate enough headroom to start with. 427 */ 428 if (skb_headroom(skb) < needed_headroom && 429 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 430 dev_kfree_skb(skb); 431 return NULL; 432 } 433 } else { 434 /* 435 * Need to make a copy and possibly remove radiotap header 436 * and FCS from the original. 437 */ 438 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); 439 440 origskb = remove_monitor_info(local, origskb); 441 442 if (!skb) 443 return origskb; 444 } 445 446 /* prepend radiotap information */ 447 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 448 true); 449 450 skb_reset_mac_header(skb); 451 skb->ip_summed = CHECKSUM_UNNECESSARY; 452 skb->pkt_type = PACKET_OTHERHOST; 453 skb->protocol = htons(ETH_P_802_2); 454 455 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 456 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) 457 continue; 458 459 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) 460 continue; 461 462 if (!ieee80211_sdata_running(sdata)) 463 continue; 464 465 if (prev_dev) { 466 skb2 = skb_clone(skb, GFP_ATOMIC); 467 if (skb2) { 468 skb2->dev = prev_dev; 469 netif_receive_skb(skb2); 470 } 471 } 472 473 prev_dev = sdata->dev; 474 sdata->dev->stats.rx_packets++; 475 sdata->dev->stats.rx_bytes += skb->len; 476 } 477 478 if (prev_dev) { 479 skb->dev = prev_dev; 480 netif_receive_skb(skb); 481 } else 482 dev_kfree_skb(skb); 483 484 return origskb; 485 } 486 487 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 488 { 489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 490 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 491 int tid, seqno_idx, security_idx; 492 493 /* does the frame have a qos control field? */ 494 if (ieee80211_is_data_qos(hdr->frame_control)) { 495 u8 *qc = ieee80211_get_qos_ctl(hdr); 496 /* frame has qos control */ 497 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 498 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 499 status->rx_flags |= IEEE80211_RX_AMSDU; 500 501 seqno_idx = tid; 502 security_idx = tid; 503 } else { 504 /* 505 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 506 * 507 * Sequence numbers for management frames, QoS data 508 * frames with a broadcast/multicast address in the 509 * Address 1 field, and all non-QoS data frames sent 510 * by QoS STAs are assigned using an additional single 511 * modulo-4096 counter, [...] 512 * 513 * We also use that counter for non-QoS STAs. 514 */ 515 seqno_idx = IEEE80211_NUM_TIDS; 516 security_idx = 0; 517 if (ieee80211_is_mgmt(hdr->frame_control)) 518 security_idx = IEEE80211_NUM_TIDS; 519 tid = 0; 520 } 521 522 rx->seqno_idx = seqno_idx; 523 rx->security_idx = security_idx; 524 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 525 * For now, set skb->priority to 0 for other cases. */ 526 rx->skb->priority = (tid > 7) ? 0 : tid; 527 } 528 529 /** 530 * DOC: Packet alignment 531 * 532 * Drivers always need to pass packets that are aligned to two-byte boundaries 533 * to the stack. 534 * 535 * Additionally, should, if possible, align the payload data in a way that 536 * guarantees that the contained IP header is aligned to a four-byte 537 * boundary. In the case of regular frames, this simply means aligning the 538 * payload to a four-byte boundary (because either the IP header is directly 539 * contained, or IV/RFC1042 headers that have a length divisible by four are 540 * in front of it). If the payload data is not properly aligned and the 541 * architecture doesn't support efficient unaligned operations, mac80211 542 * will align the data. 543 * 544 * With A-MSDU frames, however, the payload data address must yield two modulo 545 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 546 * push the IP header further back to a multiple of four again. Thankfully, the 547 * specs were sane enough this time around to require padding each A-MSDU 548 * subframe to a length that is a multiple of four. 549 * 550 * Padding like Atheros hardware adds which is between the 802.11 header and 551 * the payload is not supported, the driver is required to move the 802.11 552 * header to be directly in front of the payload in that case. 553 */ 554 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 555 { 556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 557 WARN_ONCE((unsigned long)rx->skb->data & 1, 558 "unaligned packet at 0x%p\n", rx->skb->data); 559 #endif 560 } 561 562 563 /* rx handlers */ 564 565 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 566 { 567 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 568 569 if (is_multicast_ether_addr(hdr->addr1)) 570 return 0; 571 572 return ieee80211_is_robust_mgmt_frame(skb); 573 } 574 575 576 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 577 { 578 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 579 580 if (!is_multicast_ether_addr(hdr->addr1)) 581 return 0; 582 583 return ieee80211_is_robust_mgmt_frame(skb); 584 } 585 586 587 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 588 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 589 { 590 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 591 struct ieee80211_mmie *mmie; 592 593 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 594 return -1; 595 596 if (!ieee80211_is_robust_mgmt_frame(skb)) 597 return -1; /* not a robust management frame */ 598 599 mmie = (struct ieee80211_mmie *) 600 (skb->data + skb->len - sizeof(*mmie)); 601 if (mmie->element_id != WLAN_EID_MMIE || 602 mmie->length != sizeof(*mmie) - 2) 603 return -1; 604 605 return le16_to_cpu(mmie->key_id); 606 } 607 608 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs, 609 struct sk_buff *skb) 610 { 611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 612 __le16 fc; 613 int hdrlen; 614 u8 keyid; 615 616 fc = hdr->frame_control; 617 hdrlen = ieee80211_hdrlen(fc); 618 619 if (skb->len < hdrlen + cs->hdr_len) 620 return -EINVAL; 621 622 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1); 623 keyid &= cs->key_idx_mask; 624 keyid >>= cs->key_idx_shift; 625 626 return keyid; 627 } 628 629 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 630 { 631 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 632 char *dev_addr = rx->sdata->vif.addr; 633 634 if (ieee80211_is_data(hdr->frame_control)) { 635 if (is_multicast_ether_addr(hdr->addr1)) { 636 if (ieee80211_has_tods(hdr->frame_control) || 637 !ieee80211_has_fromds(hdr->frame_control)) 638 return RX_DROP_MONITOR; 639 if (ether_addr_equal(hdr->addr3, dev_addr)) 640 return RX_DROP_MONITOR; 641 } else { 642 if (!ieee80211_has_a4(hdr->frame_control)) 643 return RX_DROP_MONITOR; 644 if (ether_addr_equal(hdr->addr4, dev_addr)) 645 return RX_DROP_MONITOR; 646 } 647 } 648 649 /* If there is not an established peer link and this is not a peer link 650 * establisment frame, beacon or probe, drop the frame. 651 */ 652 653 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 654 struct ieee80211_mgmt *mgmt; 655 656 if (!ieee80211_is_mgmt(hdr->frame_control)) 657 return RX_DROP_MONITOR; 658 659 if (ieee80211_is_action(hdr->frame_control)) { 660 u8 category; 661 662 /* make sure category field is present */ 663 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 664 return RX_DROP_MONITOR; 665 666 mgmt = (struct ieee80211_mgmt *)hdr; 667 category = mgmt->u.action.category; 668 if (category != WLAN_CATEGORY_MESH_ACTION && 669 category != WLAN_CATEGORY_SELF_PROTECTED) 670 return RX_DROP_MONITOR; 671 return RX_CONTINUE; 672 } 673 674 if (ieee80211_is_probe_req(hdr->frame_control) || 675 ieee80211_is_probe_resp(hdr->frame_control) || 676 ieee80211_is_beacon(hdr->frame_control) || 677 ieee80211_is_auth(hdr->frame_control)) 678 return RX_CONTINUE; 679 680 return RX_DROP_MONITOR; 681 } 682 683 return RX_CONTINUE; 684 } 685 686 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 687 struct tid_ampdu_rx *tid_agg_rx, 688 int index, 689 struct sk_buff_head *frames) 690 { 691 struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; 692 struct ieee80211_rx_status *status; 693 694 lockdep_assert_held(&tid_agg_rx->reorder_lock); 695 696 if (!skb) 697 goto no_frame; 698 699 /* release the frame from the reorder ring buffer */ 700 tid_agg_rx->stored_mpdu_num--; 701 tid_agg_rx->reorder_buf[index] = NULL; 702 status = IEEE80211_SKB_RXCB(skb); 703 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 704 __skb_queue_tail(frames, skb); 705 706 no_frame: 707 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 708 } 709 710 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 711 struct tid_ampdu_rx *tid_agg_rx, 712 u16 head_seq_num, 713 struct sk_buff_head *frames) 714 { 715 int index; 716 717 lockdep_assert_held(&tid_agg_rx->reorder_lock); 718 719 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 720 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 721 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 722 frames); 723 } 724 } 725 726 /* 727 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 728 * the skb was added to the buffer longer than this time ago, the earlier 729 * frames that have not yet been received are assumed to be lost and the skb 730 * can be released for processing. This may also release other skb's from the 731 * reorder buffer if there are no additional gaps between the frames. 732 * 733 * Callers must hold tid_agg_rx->reorder_lock. 734 */ 735 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 736 737 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 738 struct tid_ampdu_rx *tid_agg_rx, 739 struct sk_buff_head *frames) 740 { 741 int index, j; 742 743 lockdep_assert_held(&tid_agg_rx->reorder_lock); 744 745 /* release the buffer until next missing frame */ 746 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 747 if (!tid_agg_rx->reorder_buf[index] && 748 tid_agg_rx->stored_mpdu_num) { 749 /* 750 * No buffers ready to be released, but check whether any 751 * frames in the reorder buffer have timed out. 752 */ 753 int skipped = 1; 754 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 755 j = (j + 1) % tid_agg_rx->buf_size) { 756 if (!tid_agg_rx->reorder_buf[j]) { 757 skipped++; 758 continue; 759 } 760 if (skipped && 761 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 762 HT_RX_REORDER_BUF_TIMEOUT)) 763 goto set_release_timer; 764 765 ht_dbg_ratelimited(sdata, 766 "release an RX reorder frame due to timeout on earlier frames\n"); 767 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 768 frames); 769 770 /* 771 * Increment the head seq# also for the skipped slots. 772 */ 773 tid_agg_rx->head_seq_num = 774 (tid_agg_rx->head_seq_num + 775 skipped) & IEEE80211_SN_MASK; 776 skipped = 0; 777 } 778 } else while (tid_agg_rx->reorder_buf[index]) { 779 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 780 frames); 781 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 782 } 783 784 if (tid_agg_rx->stored_mpdu_num) { 785 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 786 787 for (; j != (index - 1) % tid_agg_rx->buf_size; 788 j = (j + 1) % tid_agg_rx->buf_size) { 789 if (tid_agg_rx->reorder_buf[j]) 790 break; 791 } 792 793 set_release_timer: 794 795 mod_timer(&tid_agg_rx->reorder_timer, 796 tid_agg_rx->reorder_time[j] + 1 + 797 HT_RX_REORDER_BUF_TIMEOUT); 798 } else { 799 del_timer(&tid_agg_rx->reorder_timer); 800 } 801 } 802 803 /* 804 * As this function belongs to the RX path it must be under 805 * rcu_read_lock protection. It returns false if the frame 806 * can be processed immediately, true if it was consumed. 807 */ 808 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 809 struct tid_ampdu_rx *tid_agg_rx, 810 struct sk_buff *skb, 811 struct sk_buff_head *frames) 812 { 813 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 814 u16 sc = le16_to_cpu(hdr->seq_ctrl); 815 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 816 u16 head_seq_num, buf_size; 817 int index; 818 bool ret = true; 819 820 spin_lock(&tid_agg_rx->reorder_lock); 821 822 buf_size = tid_agg_rx->buf_size; 823 head_seq_num = tid_agg_rx->head_seq_num; 824 825 /* frame with out of date sequence number */ 826 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 827 dev_kfree_skb(skb); 828 goto out; 829 } 830 831 /* 832 * If frame the sequence number exceeds our buffering window 833 * size release some previous frames to make room for this one. 834 */ 835 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 836 head_seq_num = ieee80211_sn_inc( 837 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 838 /* release stored frames up to new head to stack */ 839 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 840 head_seq_num, frames); 841 } 842 843 /* Now the new frame is always in the range of the reordering buffer */ 844 845 index = mpdu_seq_num % tid_agg_rx->buf_size; 846 847 /* check if we already stored this frame */ 848 if (tid_agg_rx->reorder_buf[index]) { 849 dev_kfree_skb(skb); 850 goto out; 851 } 852 853 /* 854 * If the current MPDU is in the right order and nothing else 855 * is stored we can process it directly, no need to buffer it. 856 * If it is first but there's something stored, we may be able 857 * to release frames after this one. 858 */ 859 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 860 tid_agg_rx->stored_mpdu_num == 0) { 861 tid_agg_rx->head_seq_num = 862 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 863 ret = false; 864 goto out; 865 } 866 867 /* put the frame in the reordering buffer */ 868 tid_agg_rx->reorder_buf[index] = skb; 869 tid_agg_rx->reorder_time[index] = jiffies; 870 tid_agg_rx->stored_mpdu_num++; 871 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 872 873 out: 874 spin_unlock(&tid_agg_rx->reorder_lock); 875 return ret; 876 } 877 878 /* 879 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 880 * true if the MPDU was buffered, false if it should be processed. 881 */ 882 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 883 struct sk_buff_head *frames) 884 { 885 struct sk_buff *skb = rx->skb; 886 struct ieee80211_local *local = rx->local; 887 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 889 struct sta_info *sta = rx->sta; 890 struct tid_ampdu_rx *tid_agg_rx; 891 u16 sc; 892 u8 tid, ack_policy; 893 894 if (!ieee80211_is_data_qos(hdr->frame_control) || 895 is_multicast_ether_addr(hdr->addr1)) 896 goto dont_reorder; 897 898 /* 899 * filter the QoS data rx stream according to 900 * STA/TID and check if this STA/TID is on aggregation 901 */ 902 903 if (!sta) 904 goto dont_reorder; 905 906 ack_policy = *ieee80211_get_qos_ctl(hdr) & 907 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 908 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 909 910 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 911 if (!tid_agg_rx) 912 goto dont_reorder; 913 914 /* qos null data frames are excluded */ 915 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 916 goto dont_reorder; 917 918 /* not part of a BA session */ 919 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 920 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) 921 goto dont_reorder; 922 923 /* not actually part of this BA session */ 924 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 925 goto dont_reorder; 926 927 /* new, potentially un-ordered, ampdu frame - process it */ 928 929 /* reset session timer */ 930 if (tid_agg_rx->timeout) 931 tid_agg_rx->last_rx = jiffies; 932 933 /* if this mpdu is fragmented - terminate rx aggregation session */ 934 sc = le16_to_cpu(hdr->seq_ctrl); 935 if (sc & IEEE80211_SCTL_FRAG) { 936 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 937 skb_queue_tail(&rx->sdata->skb_queue, skb); 938 ieee80211_queue_work(&local->hw, &rx->sdata->work); 939 return; 940 } 941 942 /* 943 * No locking needed -- we will only ever process one 944 * RX packet at a time, and thus own tid_agg_rx. All 945 * other code manipulating it needs to (and does) make 946 * sure that we cannot get to it any more before doing 947 * anything with it. 948 */ 949 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 950 frames)) 951 return; 952 953 dont_reorder: 954 __skb_queue_tail(frames, skb); 955 } 956 957 static ieee80211_rx_result debug_noinline 958 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 959 { 960 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 961 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 962 963 /* 964 * Drop duplicate 802.11 retransmissions 965 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 966 */ 967 if (rx->skb->len >= 24 && rx->sta && 968 !ieee80211_is_ctl(hdr->frame_control) && 969 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 970 !is_multicast_ether_addr(hdr->addr1)) { 971 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 972 rx->sta->last_seq_ctrl[rx->seqno_idx] == 973 hdr->seq_ctrl)) { 974 if (status->rx_flags & IEEE80211_RX_RA_MATCH) { 975 rx->local->dot11FrameDuplicateCount++; 976 rx->sta->num_duplicates++; 977 } 978 return RX_DROP_UNUSABLE; 979 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 980 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 981 } 982 } 983 984 if (unlikely(rx->skb->len < 16)) { 985 I802_DEBUG_INC(rx->local->rx_handlers_drop_short); 986 return RX_DROP_MONITOR; 987 } 988 989 /* Drop disallowed frame classes based on STA auth/assoc state; 990 * IEEE 802.11, Chap 5.5. 991 * 992 * mac80211 filters only based on association state, i.e. it drops 993 * Class 3 frames from not associated stations. hostapd sends 994 * deauth/disassoc frames when needed. In addition, hostapd is 995 * responsible for filtering on both auth and assoc states. 996 */ 997 998 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 999 return ieee80211_rx_mesh_check(rx); 1000 1001 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1002 ieee80211_is_pspoll(hdr->frame_control)) && 1003 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1004 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 1005 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1006 /* 1007 * accept port control frames from the AP even when it's not 1008 * yet marked ASSOC to prevent a race where we don't set the 1009 * assoc bit quickly enough before it sends the first frame 1010 */ 1011 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1012 ieee80211_is_data_present(hdr->frame_control)) { 1013 unsigned int hdrlen; 1014 __be16 ethertype; 1015 1016 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1017 1018 if (rx->skb->len < hdrlen + 8) 1019 return RX_DROP_MONITOR; 1020 1021 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1022 if (ethertype == rx->sdata->control_port_protocol) 1023 return RX_CONTINUE; 1024 } 1025 1026 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1027 cfg80211_rx_spurious_frame(rx->sdata->dev, 1028 hdr->addr2, 1029 GFP_ATOMIC)) 1030 return RX_DROP_UNUSABLE; 1031 1032 return RX_DROP_MONITOR; 1033 } 1034 1035 return RX_CONTINUE; 1036 } 1037 1038 1039 static ieee80211_rx_result debug_noinline 1040 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1041 { 1042 struct ieee80211_local *local; 1043 struct ieee80211_hdr *hdr; 1044 struct sk_buff *skb; 1045 1046 local = rx->local; 1047 skb = rx->skb; 1048 hdr = (struct ieee80211_hdr *) skb->data; 1049 1050 if (!local->pspolling) 1051 return RX_CONTINUE; 1052 1053 if (!ieee80211_has_fromds(hdr->frame_control)) 1054 /* this is not from AP */ 1055 return RX_CONTINUE; 1056 1057 if (!ieee80211_is_data(hdr->frame_control)) 1058 return RX_CONTINUE; 1059 1060 if (!ieee80211_has_moredata(hdr->frame_control)) { 1061 /* AP has no more frames buffered for us */ 1062 local->pspolling = false; 1063 return RX_CONTINUE; 1064 } 1065 1066 /* more data bit is set, let's request a new frame from the AP */ 1067 ieee80211_send_pspoll(local, rx->sdata); 1068 1069 return RX_CONTINUE; 1070 } 1071 1072 static void sta_ps_start(struct sta_info *sta) 1073 { 1074 struct ieee80211_sub_if_data *sdata = sta->sdata; 1075 struct ieee80211_local *local = sdata->local; 1076 struct ps_data *ps; 1077 1078 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1079 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1080 ps = &sdata->bss->ps; 1081 else 1082 return; 1083 1084 atomic_inc(&ps->num_sta_ps); 1085 set_sta_flag(sta, WLAN_STA_PS_STA); 1086 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1087 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1088 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1089 sta->sta.addr, sta->sta.aid); 1090 } 1091 1092 static void sta_ps_end(struct sta_info *sta) 1093 { 1094 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1095 sta->sta.addr, sta->sta.aid); 1096 1097 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1098 /* 1099 * Clear the flag only if the other one is still set 1100 * so that the TX path won't start TX'ing new frames 1101 * directly ... In the case that the driver flag isn't 1102 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1103 */ 1104 clear_sta_flag(sta, WLAN_STA_PS_STA); 1105 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1106 sta->sta.addr, sta->sta.aid); 1107 return; 1108 } 1109 1110 ieee80211_sta_ps_deliver_wakeup(sta); 1111 } 1112 1113 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) 1114 { 1115 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); 1116 bool in_ps; 1117 1118 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); 1119 1120 /* Don't let the same PS state be set twice */ 1121 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); 1122 if ((start && in_ps) || (!start && !in_ps)) 1123 return -EINVAL; 1124 1125 if (start) 1126 sta_ps_start(sta_inf); 1127 else 1128 sta_ps_end(sta_inf); 1129 1130 return 0; 1131 } 1132 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1133 1134 static ieee80211_rx_result debug_noinline 1135 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1136 { 1137 struct ieee80211_sub_if_data *sdata = rx->sdata; 1138 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1139 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1140 int tid, ac; 1141 1142 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1143 return RX_CONTINUE; 1144 1145 if (sdata->vif.type != NL80211_IFTYPE_AP && 1146 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1147 return RX_CONTINUE; 1148 1149 /* 1150 * The device handles station powersave, so don't do anything about 1151 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1152 * it to mac80211 since they're handled.) 1153 */ 1154 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) 1155 return RX_CONTINUE; 1156 1157 /* 1158 * Don't do anything if the station isn't already asleep. In 1159 * the uAPSD case, the station will probably be marked asleep, 1160 * in the PS-Poll case the station must be confused ... 1161 */ 1162 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1163 return RX_CONTINUE; 1164 1165 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1166 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { 1167 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1168 ieee80211_sta_ps_deliver_poll_response(rx->sta); 1169 else 1170 set_sta_flag(rx->sta, WLAN_STA_PSPOLL); 1171 } 1172 1173 /* Free PS Poll skb here instead of returning RX_DROP that would 1174 * count as an dropped frame. */ 1175 dev_kfree_skb(rx->skb); 1176 1177 return RX_QUEUED; 1178 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1179 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1180 ieee80211_has_pm(hdr->frame_control) && 1181 (ieee80211_is_data_qos(hdr->frame_control) || 1182 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1183 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 1184 ac = ieee802_1d_to_ac[tid & 7]; 1185 1186 /* 1187 * If this AC is not trigger-enabled do nothing. 1188 * 1189 * NB: This could/should check a separate bitmap of trigger- 1190 * enabled queues, but for now we only implement uAPSD w/o 1191 * TSPEC changes to the ACs, so they're always the same. 1192 */ 1193 if (!(rx->sta->sta.uapsd_queues & BIT(ac))) 1194 return RX_CONTINUE; 1195 1196 /* if we are in a service period, do nothing */ 1197 if (test_sta_flag(rx->sta, WLAN_STA_SP)) 1198 return RX_CONTINUE; 1199 1200 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1201 ieee80211_sta_ps_deliver_uapsd(rx->sta); 1202 else 1203 set_sta_flag(rx->sta, WLAN_STA_UAPSD); 1204 } 1205 1206 return RX_CONTINUE; 1207 } 1208 1209 static ieee80211_rx_result debug_noinline 1210 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1211 { 1212 struct sta_info *sta = rx->sta; 1213 struct sk_buff *skb = rx->skb; 1214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1216 int i; 1217 1218 if (!sta) 1219 return RX_CONTINUE; 1220 1221 /* 1222 * Update last_rx only for IBSS packets which are for the current 1223 * BSSID and for station already AUTHORIZED to avoid keeping the 1224 * current IBSS network alive in cases where other STAs start 1225 * using different BSSID. This will also give the station another 1226 * chance to restart the authentication/authorization in case 1227 * something went wrong the first time. 1228 */ 1229 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1230 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1231 NL80211_IFTYPE_ADHOC); 1232 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1233 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1234 sta->last_rx = jiffies; 1235 if (ieee80211_is_data(hdr->frame_control) && 1236 !is_multicast_ether_addr(hdr->addr1)) { 1237 sta->last_rx_rate_idx = status->rate_idx; 1238 sta->last_rx_rate_flag = status->flag; 1239 sta->last_rx_rate_vht_flag = status->vht_flag; 1240 sta->last_rx_rate_vht_nss = status->vht_nss; 1241 } 1242 } 1243 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1244 /* 1245 * Mesh beacons will update last_rx when if they are found to 1246 * match the current local configuration when processed. 1247 */ 1248 sta->last_rx = jiffies; 1249 if (ieee80211_is_data(hdr->frame_control)) { 1250 sta->last_rx_rate_idx = status->rate_idx; 1251 sta->last_rx_rate_flag = status->flag; 1252 sta->last_rx_rate_vht_flag = status->vht_flag; 1253 sta->last_rx_rate_vht_nss = status->vht_nss; 1254 } 1255 } 1256 1257 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1258 return RX_CONTINUE; 1259 1260 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1261 ieee80211_sta_rx_notify(rx->sdata, hdr); 1262 1263 sta->rx_fragments++; 1264 sta->rx_bytes += rx->skb->len; 1265 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1266 sta->last_signal = status->signal; 1267 ewma_add(&sta->avg_signal, -status->signal); 1268 } 1269 1270 if (status->chains) { 1271 sta->chains = status->chains; 1272 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1273 int signal = status->chain_signal[i]; 1274 1275 if (!(status->chains & BIT(i))) 1276 continue; 1277 1278 sta->chain_signal_last[i] = signal; 1279 ewma_add(&sta->chain_signal_avg[i], -signal); 1280 } 1281 } 1282 1283 /* 1284 * Change STA power saving mode only at the end of a frame 1285 * exchange sequence. 1286 */ 1287 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && 1288 !ieee80211_has_morefrags(hdr->frame_control) && 1289 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1290 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1291 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1292 /* PM bit is only checked in frames where it isn't reserved, 1293 * in AP mode it's reserved in non-bufferable management frames 1294 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field) 1295 */ 1296 (!ieee80211_is_mgmt(hdr->frame_control) || 1297 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) { 1298 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1299 if (!ieee80211_has_pm(hdr->frame_control)) 1300 sta_ps_end(sta); 1301 } else { 1302 if (ieee80211_has_pm(hdr->frame_control)) 1303 sta_ps_start(sta); 1304 } 1305 } 1306 1307 /* mesh power save support */ 1308 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1309 ieee80211_mps_rx_h_sta_process(sta, hdr); 1310 1311 /* 1312 * Drop (qos-)data::nullfunc frames silently, since they 1313 * are used only to control station power saving mode. 1314 */ 1315 if (ieee80211_is_nullfunc(hdr->frame_control) || 1316 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1317 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1318 1319 /* 1320 * If we receive a 4-addr nullfunc frame from a STA 1321 * that was not moved to a 4-addr STA vlan yet send 1322 * the event to userspace and for older hostapd drop 1323 * the frame to the monitor interface. 1324 */ 1325 if (ieee80211_has_a4(hdr->frame_control) && 1326 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1327 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1328 !rx->sdata->u.vlan.sta))) { 1329 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1330 cfg80211_rx_unexpected_4addr_frame( 1331 rx->sdata->dev, sta->sta.addr, 1332 GFP_ATOMIC); 1333 return RX_DROP_MONITOR; 1334 } 1335 /* 1336 * Update counter and free packet here to avoid 1337 * counting this as a dropped packed. 1338 */ 1339 sta->rx_packets++; 1340 dev_kfree_skb(rx->skb); 1341 return RX_QUEUED; 1342 } 1343 1344 return RX_CONTINUE; 1345 } /* ieee80211_rx_h_sta_process */ 1346 1347 static ieee80211_rx_result debug_noinline 1348 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1349 { 1350 struct sk_buff *skb = rx->skb; 1351 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1352 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1353 int keyidx; 1354 int hdrlen; 1355 ieee80211_rx_result result = RX_DROP_UNUSABLE; 1356 struct ieee80211_key *sta_ptk = NULL; 1357 int mmie_keyidx = -1; 1358 __le16 fc; 1359 const struct ieee80211_cipher_scheme *cs = NULL; 1360 1361 /* 1362 * Key selection 101 1363 * 1364 * There are four types of keys: 1365 * - GTK (group keys) 1366 * - IGTK (group keys for management frames) 1367 * - PTK (pairwise keys) 1368 * - STK (station-to-station pairwise keys) 1369 * 1370 * When selecting a key, we have to distinguish between multicast 1371 * (including broadcast) and unicast frames, the latter can only 1372 * use PTKs and STKs while the former always use GTKs and IGTKs. 1373 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 1374 * unicast frames can also use key indices like GTKs. Hence, if we 1375 * don't have a PTK/STK we check the key index for a WEP key. 1376 * 1377 * Note that in a regular BSS, multicast frames are sent by the 1378 * AP only, associated stations unicast the frame to the AP first 1379 * which then multicasts it on their behalf. 1380 * 1381 * There is also a slight problem in IBSS mode: GTKs are negotiated 1382 * with each station, that is something we don't currently handle. 1383 * The spec seems to expect that one negotiates the same key with 1384 * every station but there's no such requirement; VLANs could be 1385 * possible. 1386 */ 1387 1388 /* 1389 * No point in finding a key and decrypting if the frame is neither 1390 * addressed to us nor a multicast frame. 1391 */ 1392 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1393 return RX_CONTINUE; 1394 1395 /* start without a key */ 1396 rx->key = NULL; 1397 fc = hdr->frame_control; 1398 1399 if (rx->sta) { 1400 int keyid = rx->sta->ptk_idx; 1401 1402 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) { 1403 cs = rx->sta->cipher_scheme; 1404 keyid = iwl80211_get_cs_keyid(cs, rx->skb); 1405 if (unlikely(keyid < 0)) 1406 return RX_DROP_UNUSABLE; 1407 } 1408 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1409 } 1410 1411 if (!ieee80211_has_protected(fc)) 1412 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1413 1414 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1415 rx->key = sta_ptk; 1416 if ((status->flag & RX_FLAG_DECRYPTED) && 1417 (status->flag & RX_FLAG_IV_STRIPPED)) 1418 return RX_CONTINUE; 1419 /* Skip decryption if the frame is not protected. */ 1420 if (!ieee80211_has_protected(fc)) 1421 return RX_CONTINUE; 1422 } else if (mmie_keyidx >= 0) { 1423 /* Broadcast/multicast robust management frame / BIP */ 1424 if ((status->flag & RX_FLAG_DECRYPTED) && 1425 (status->flag & RX_FLAG_IV_STRIPPED)) 1426 return RX_CONTINUE; 1427 1428 if (mmie_keyidx < NUM_DEFAULT_KEYS || 1429 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1430 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1431 if (rx->sta) 1432 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 1433 if (!rx->key) 1434 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 1435 } else if (!ieee80211_has_protected(fc)) { 1436 /* 1437 * The frame was not protected, so skip decryption. However, we 1438 * need to set rx->key if there is a key that could have been 1439 * used so that the frame may be dropped if encryption would 1440 * have been expected. 1441 */ 1442 struct ieee80211_key *key = NULL; 1443 struct ieee80211_sub_if_data *sdata = rx->sdata; 1444 int i; 1445 1446 if (ieee80211_is_mgmt(fc) && 1447 is_multicast_ether_addr(hdr->addr1) && 1448 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 1449 rx->key = key; 1450 else { 1451 if (rx->sta) { 1452 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1453 key = rcu_dereference(rx->sta->gtk[i]); 1454 if (key) 1455 break; 1456 } 1457 } 1458 if (!key) { 1459 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1460 key = rcu_dereference(sdata->keys[i]); 1461 if (key) 1462 break; 1463 } 1464 } 1465 if (key) 1466 rx->key = key; 1467 } 1468 return RX_CONTINUE; 1469 } else { 1470 u8 keyid; 1471 1472 /* 1473 * The device doesn't give us the IV so we won't be 1474 * able to look up the key. That's ok though, we 1475 * don't need to decrypt the frame, we just won't 1476 * be able to keep statistics accurate. 1477 * Except for key threshold notifications, should 1478 * we somehow allow the driver to tell us which key 1479 * the hardware used if this flag is set? 1480 */ 1481 if ((status->flag & RX_FLAG_DECRYPTED) && 1482 (status->flag & RX_FLAG_IV_STRIPPED)) 1483 return RX_CONTINUE; 1484 1485 hdrlen = ieee80211_hdrlen(fc); 1486 1487 if (cs) { 1488 keyidx = iwl80211_get_cs_keyid(cs, rx->skb); 1489 1490 if (unlikely(keyidx < 0)) 1491 return RX_DROP_UNUSABLE; 1492 } else { 1493 if (rx->skb->len < 8 + hdrlen) 1494 return RX_DROP_UNUSABLE; /* TODO: count this? */ 1495 /* 1496 * no need to call ieee80211_wep_get_keyidx, 1497 * it verifies a bunch of things we've done already 1498 */ 1499 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 1500 keyidx = keyid >> 6; 1501 } 1502 1503 /* check per-station GTK first, if multicast packet */ 1504 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1505 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1506 1507 /* if not found, try default key */ 1508 if (!rx->key) { 1509 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1510 1511 /* 1512 * RSNA-protected unicast frames should always be 1513 * sent with pairwise or station-to-station keys, 1514 * but for WEP we allow using a key index as well. 1515 */ 1516 if (rx->key && 1517 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 1518 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 1519 !is_multicast_ether_addr(hdr->addr1)) 1520 rx->key = NULL; 1521 } 1522 } 1523 1524 if (rx->key) { 1525 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 1526 return RX_DROP_MONITOR; 1527 1528 rx->key->tx_rx_count++; 1529 /* TODO: add threshold stuff again */ 1530 } else { 1531 return RX_DROP_MONITOR; 1532 } 1533 1534 switch (rx->key->conf.cipher) { 1535 case WLAN_CIPHER_SUITE_WEP40: 1536 case WLAN_CIPHER_SUITE_WEP104: 1537 result = ieee80211_crypto_wep_decrypt(rx); 1538 break; 1539 case WLAN_CIPHER_SUITE_TKIP: 1540 result = ieee80211_crypto_tkip_decrypt(rx); 1541 break; 1542 case WLAN_CIPHER_SUITE_CCMP: 1543 result = ieee80211_crypto_ccmp_decrypt(rx); 1544 break; 1545 case WLAN_CIPHER_SUITE_AES_CMAC: 1546 result = ieee80211_crypto_aes_cmac_decrypt(rx); 1547 break; 1548 default: 1549 result = ieee80211_crypto_hw_decrypt(rx); 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(rx->skb))) 1823 return -EACCES; 1824 } 1825 1826 return 0; 1827 } 1828 1829 static int 1830 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 1831 { 1832 struct ieee80211_sub_if_data *sdata = rx->sdata; 1833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1834 bool check_port_control = false; 1835 struct ethhdr *ehdr; 1836 int ret; 1837 1838 *port_control = false; 1839 if (ieee80211_has_a4(hdr->frame_control) && 1840 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 1841 return -1; 1842 1843 if (sdata->vif.type == NL80211_IFTYPE_STATION && 1844 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 1845 1846 if (!sdata->u.mgd.use_4addr) 1847 return -1; 1848 else 1849 check_port_control = true; 1850 } 1851 1852 if (is_multicast_ether_addr(hdr->addr1) && 1853 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 1854 return -1; 1855 1856 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 1857 if (ret < 0) 1858 return ret; 1859 1860 ehdr = (struct ethhdr *) rx->skb->data; 1861 if (ehdr->h_proto == rx->sdata->control_port_protocol) 1862 *port_control = true; 1863 else if (check_port_control) 1864 return -1; 1865 1866 return 0; 1867 } 1868 1869 /* 1870 * requires that rx->skb is a frame with ethernet header 1871 */ 1872 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 1873 { 1874 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 1875 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 1876 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1877 1878 /* 1879 * Allow EAPOL frames to us/the PAE group address regardless 1880 * of whether the frame was encrypted or not. 1881 */ 1882 if (ehdr->h_proto == rx->sdata->control_port_protocol && 1883 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || 1884 ether_addr_equal(ehdr->h_dest, pae_group_addr))) 1885 return true; 1886 1887 if (ieee80211_802_1x_port_control(rx) || 1888 ieee80211_drop_unencrypted(rx, fc)) 1889 return false; 1890 1891 return true; 1892 } 1893 1894 /* 1895 * requires that rx->skb is a frame with ethernet header 1896 */ 1897 static void 1898 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 1899 { 1900 struct ieee80211_sub_if_data *sdata = rx->sdata; 1901 struct net_device *dev = sdata->dev; 1902 struct sk_buff *skb, *xmit_skb; 1903 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1904 struct sta_info *dsta; 1905 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1906 1907 skb = rx->skb; 1908 xmit_skb = NULL; 1909 1910 if ((sdata->vif.type == NL80211_IFTYPE_AP || 1911 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1912 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 1913 (status->rx_flags & IEEE80211_RX_RA_MATCH) && 1914 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 1915 if (is_multicast_ether_addr(ehdr->h_dest)) { 1916 /* 1917 * send multicast frames both to higher layers in 1918 * local net stack and back to the wireless medium 1919 */ 1920 xmit_skb = skb_copy(skb, GFP_ATOMIC); 1921 if (!xmit_skb) 1922 net_info_ratelimited("%s: failed to clone multicast frame\n", 1923 dev->name); 1924 } else { 1925 dsta = sta_info_get(sdata, skb->data); 1926 if (dsta) { 1927 /* 1928 * The destination station is associated to 1929 * this AP (in this VLAN), so send the frame 1930 * directly to it and do not pass it to local 1931 * net stack. 1932 */ 1933 xmit_skb = skb; 1934 skb = NULL; 1935 } 1936 } 1937 } 1938 1939 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1940 if (skb) { 1941 /* 'align' will only take the values 0 or 2 here since all 1942 * frames are required to be aligned to 2-byte boundaries 1943 * when being passed to mac80211; the code here works just 1944 * as well if that isn't true, but mac80211 assumes it can 1945 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 1946 */ 1947 int align; 1948 1949 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 1950 if (align) { 1951 if (WARN_ON(skb_headroom(skb) < 3)) { 1952 dev_kfree_skb(skb); 1953 skb = NULL; 1954 } else { 1955 u8 *data = skb->data; 1956 size_t len = skb_headlen(skb); 1957 skb->data -= align; 1958 memmove(skb->data, data, len); 1959 skb_set_tail_pointer(skb, len); 1960 } 1961 } 1962 } 1963 #endif 1964 1965 if (skb) { 1966 /* deliver to local stack */ 1967 skb->protocol = eth_type_trans(skb, dev); 1968 memset(skb->cb, 0, sizeof(skb->cb)); 1969 if (rx->local->napi) 1970 napi_gro_receive(rx->local->napi, skb); 1971 else 1972 netif_receive_skb(skb); 1973 } 1974 1975 if (xmit_skb) { 1976 /* 1977 * Send to wireless media and increase priority by 256 to 1978 * keep the received priority instead of reclassifying 1979 * the frame (see cfg80211_classify8021d). 1980 */ 1981 xmit_skb->priority += 256; 1982 xmit_skb->protocol = htons(ETH_P_802_3); 1983 skb_reset_network_header(xmit_skb); 1984 skb_reset_mac_header(xmit_skb); 1985 dev_queue_xmit(xmit_skb); 1986 } 1987 } 1988 1989 static ieee80211_rx_result debug_noinline 1990 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 1991 { 1992 struct net_device *dev = rx->sdata->dev; 1993 struct sk_buff *skb = rx->skb; 1994 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1995 __le16 fc = hdr->frame_control; 1996 struct sk_buff_head frame_list; 1997 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1998 1999 if (unlikely(!ieee80211_is_data(fc))) 2000 return RX_CONTINUE; 2001 2002 if (unlikely(!ieee80211_is_data_present(fc))) 2003 return RX_DROP_MONITOR; 2004 2005 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 2006 return RX_CONTINUE; 2007 2008 if (ieee80211_has_a4(hdr->frame_control) && 2009 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2010 !rx->sdata->u.vlan.sta) 2011 return RX_DROP_UNUSABLE; 2012 2013 if (is_multicast_ether_addr(hdr->addr1) && 2014 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2015 rx->sdata->u.vlan.sta) || 2016 (rx->sdata->vif.type == NL80211_IFTYPE_STATION && 2017 rx->sdata->u.mgd.use_4addr))) 2018 return RX_DROP_UNUSABLE; 2019 2020 skb->dev = dev; 2021 __skb_queue_head_init(&frame_list); 2022 2023 if (skb_linearize(skb)) 2024 return RX_DROP_UNUSABLE; 2025 2026 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 2027 rx->sdata->vif.type, 2028 rx->local->hw.extra_tx_headroom, true); 2029 2030 while (!skb_queue_empty(&frame_list)) { 2031 rx->skb = __skb_dequeue(&frame_list); 2032 2033 if (!ieee80211_frame_allowed(rx, fc)) { 2034 dev_kfree_skb(rx->skb); 2035 continue; 2036 } 2037 dev->stats.rx_packets++; 2038 dev->stats.rx_bytes += rx->skb->len; 2039 2040 ieee80211_deliver_skb(rx); 2041 } 2042 2043 return RX_QUEUED; 2044 } 2045 2046 #ifdef CONFIG_MAC80211_MESH 2047 static ieee80211_rx_result 2048 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 2049 { 2050 struct ieee80211_hdr *fwd_hdr, *hdr; 2051 struct ieee80211_tx_info *info; 2052 struct ieee80211s_hdr *mesh_hdr; 2053 struct sk_buff *skb = rx->skb, *fwd_skb; 2054 struct ieee80211_local *local = rx->local; 2055 struct ieee80211_sub_if_data *sdata = rx->sdata; 2056 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2057 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2058 u16 q, hdrlen; 2059 2060 hdr = (struct ieee80211_hdr *) skb->data; 2061 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2062 2063 /* make sure fixed part of mesh header is there, also checks skb len */ 2064 if (!pskb_may_pull(rx->skb, hdrlen + 6)) 2065 return RX_DROP_MONITOR; 2066 2067 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2068 2069 /* make sure full mesh header is there, also checks skb len */ 2070 if (!pskb_may_pull(rx->skb, 2071 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) 2072 return RX_DROP_MONITOR; 2073 2074 /* reload pointers */ 2075 hdr = (struct ieee80211_hdr *) skb->data; 2076 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2077 2078 /* frame is in RMC, don't forward */ 2079 if (ieee80211_is_data(hdr->frame_control) && 2080 is_multicast_ether_addr(hdr->addr1) && 2081 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) 2082 return RX_DROP_MONITOR; 2083 2084 if (!ieee80211_is_data(hdr->frame_control) || 2085 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2086 return RX_CONTINUE; 2087 2088 if (!mesh_hdr->ttl) 2089 return RX_DROP_MONITOR; 2090 2091 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2092 struct mesh_path *mppath; 2093 char *proxied_addr; 2094 char *mpp_addr; 2095 2096 if (is_multicast_ether_addr(hdr->addr1)) { 2097 mpp_addr = hdr->addr3; 2098 proxied_addr = mesh_hdr->eaddr1; 2099 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) { 2100 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2101 mpp_addr = hdr->addr4; 2102 proxied_addr = mesh_hdr->eaddr2; 2103 } else { 2104 return RX_DROP_MONITOR; 2105 } 2106 2107 rcu_read_lock(); 2108 mppath = mpp_path_lookup(sdata, proxied_addr); 2109 if (!mppath) { 2110 mpp_path_add(sdata, proxied_addr, mpp_addr); 2111 } else { 2112 spin_lock_bh(&mppath->state_lock); 2113 if (!ether_addr_equal(mppath->mpp, mpp_addr)) 2114 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 2115 spin_unlock_bh(&mppath->state_lock); 2116 } 2117 rcu_read_unlock(); 2118 } 2119 2120 /* Frame has reached destination. Don't forward */ 2121 if (!is_multicast_ether_addr(hdr->addr1) && 2122 ether_addr_equal(sdata->vif.addr, hdr->addr3)) 2123 return RX_CONTINUE; 2124 2125 q = ieee80211_select_queue_80211(sdata, skb, hdr); 2126 if (ieee80211_queue_stopped(&local->hw, q)) { 2127 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 2128 return RX_DROP_MONITOR; 2129 } 2130 skb_set_queue_mapping(skb, q); 2131 2132 if (!--mesh_hdr->ttl) { 2133 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2134 goto out; 2135 } 2136 2137 if (!ifmsh->mshcfg.dot11MeshForwarding) 2138 goto out; 2139 2140 fwd_skb = skb_copy(skb, GFP_ATOMIC); 2141 if (!fwd_skb) { 2142 net_info_ratelimited("%s: failed to clone mesh frame\n", 2143 sdata->name); 2144 goto out; 2145 } 2146 2147 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 2148 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); 2149 info = IEEE80211_SKB_CB(fwd_skb); 2150 memset(info, 0, sizeof(*info)); 2151 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 2152 info->control.vif = &rx->sdata->vif; 2153 info->control.jiffies = jiffies; 2154 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 2155 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2156 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2157 /* update power mode indication when forwarding */ 2158 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2159 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2160 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2161 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2162 } else { 2163 /* unable to resolve next hop */ 2164 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2165 fwd_hdr->addr3, 0, 2166 WLAN_REASON_MESH_PATH_NOFORWARD, 2167 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 bool 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 false; 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 false; 3073 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 3074 } 3075 break; 3076 case NL80211_IFTYPE_ADHOC: 3077 if (!bssid) 3078 return false; 3079 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 3080 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) 3081 return false; 3082 if (ieee80211_is_beacon(hdr->frame_control)) { 3083 return true; 3084 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { 3085 return false; 3086 } else if (!multicast && 3087 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { 3088 if (!(sdata->dev->flags & IFF_PROMISC)) 3089 return false; 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 false; 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 false; 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 false; 3125 if (ieee80211_is_public_action(hdr, skb->len)) 3126 return true; 3127 if (!ieee80211_is_beacon(hdr->frame_control)) 3128 return false; 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 false; 3135 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2)) 3136 return false; 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 false; 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 true; 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 3171 rx->skb = skb; 3172 status->rx_flags |= IEEE80211_RX_RA_MATCH; 3173 3174 if (!prepare_for_handlers(rx, hdr)) 3175 return false; 3176 3177 if (!consume) { 3178 skb = skb_copy(skb, GFP_ATOMIC); 3179 if (!skb) { 3180 if (net_ratelimit()) 3181 wiphy_debug(local->hw.wiphy, 3182 "failed to copy skb for %s\n", 3183 sdata->name); 3184 return true; 3185 } 3186 3187 rx->skb = skb; 3188 } 3189 3190 ieee80211_invoke_rx_handlers(rx); 3191 return true; 3192 } 3193 3194 /* 3195 * This is the actual Rx frames handler. as it belongs to Rx path it must 3196 * be called with rcu_read_lock protection. 3197 */ 3198 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 3199 struct sk_buff *skb) 3200 { 3201 struct ieee80211_local *local = hw_to_local(hw); 3202 struct ieee80211_sub_if_data *sdata; 3203 struct ieee80211_hdr *hdr; 3204 __le16 fc; 3205 struct ieee80211_rx_data rx; 3206 struct ieee80211_sub_if_data *prev; 3207 struct sta_info *sta, *tmp, *prev_sta; 3208 int err = 0; 3209 3210 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 3211 memset(&rx, 0, sizeof(rx)); 3212 rx.skb = skb; 3213 rx.local = local; 3214 3215 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 3216 local->dot11ReceivedFragmentCount++; 3217 3218 if (ieee80211_is_mgmt(fc)) { 3219 /* drop frame if too short for header */ 3220 if (skb->len < ieee80211_hdrlen(fc)) 3221 err = -ENOBUFS; 3222 else 3223 err = skb_linearize(skb); 3224 } else { 3225 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 3226 } 3227 3228 if (err) { 3229 dev_kfree_skb(skb); 3230 return; 3231 } 3232 3233 hdr = (struct ieee80211_hdr *)skb->data; 3234 ieee80211_parse_qos(&rx); 3235 ieee80211_verify_alignment(&rx); 3236 3237 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 3238 ieee80211_is_beacon(hdr->frame_control))) 3239 ieee80211_scan_rx(local, skb); 3240 3241 if (ieee80211_is_data(fc)) { 3242 prev_sta = NULL; 3243 3244 for_each_sta_info(local, hdr->addr2, sta, tmp) { 3245 if (!prev_sta) { 3246 prev_sta = sta; 3247 continue; 3248 } 3249 3250 rx.sta = prev_sta; 3251 rx.sdata = prev_sta->sdata; 3252 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3253 3254 prev_sta = sta; 3255 } 3256 3257 if (prev_sta) { 3258 rx.sta = prev_sta; 3259 rx.sdata = prev_sta->sdata; 3260 3261 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3262 return; 3263 goto out; 3264 } 3265 } 3266 3267 prev = NULL; 3268 3269 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3270 if (!ieee80211_sdata_running(sdata)) 3271 continue; 3272 3273 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 3274 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3275 continue; 3276 3277 /* 3278 * frame is destined for this interface, but if it's 3279 * not also for the previous one we handle that after 3280 * the loop to avoid copying the SKB once too much 3281 */ 3282 3283 if (!prev) { 3284 prev = sdata; 3285 continue; 3286 } 3287 3288 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3289 rx.sdata = prev; 3290 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3291 3292 prev = sdata; 3293 } 3294 3295 if (prev) { 3296 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3297 rx.sdata = prev; 3298 3299 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3300 return; 3301 } 3302 3303 out: 3304 dev_kfree_skb(skb); 3305 } 3306 3307 /* 3308 * This is the receive path handler. It is called by a low level driver when an 3309 * 802.11 MPDU is received from the hardware. 3310 */ 3311 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) 3312 { 3313 struct ieee80211_local *local = hw_to_local(hw); 3314 struct ieee80211_rate *rate = NULL; 3315 struct ieee80211_supported_band *sband; 3316 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3317 3318 WARN_ON_ONCE(softirq_count() == 0); 3319 3320 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS)) 3321 goto drop; 3322 3323 sband = local->hw.wiphy->bands[status->band]; 3324 if (WARN_ON(!sband)) 3325 goto drop; 3326 3327 /* 3328 * If we're suspending, it is possible although not too likely 3329 * that we'd be receiving frames after having already partially 3330 * quiesced the stack. We can't process such frames then since 3331 * that might, for example, cause stations to be added or other 3332 * driver callbacks be invoked. 3333 */ 3334 if (unlikely(local->quiescing || local->suspended)) 3335 goto drop; 3336 3337 /* We might be during a HW reconfig, prevent Rx for the same reason */ 3338 if (unlikely(local->in_reconfig)) 3339 goto drop; 3340 3341 /* 3342 * The same happens when we're not even started, 3343 * but that's worth a warning. 3344 */ 3345 if (WARN_ON(!local->started)) 3346 goto drop; 3347 3348 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 3349 /* 3350 * Validate the rate, unless a PLCP error means that 3351 * we probably can't have a valid rate here anyway. 3352 */ 3353 3354 if (status->flag & RX_FLAG_HT) { 3355 /* 3356 * rate_idx is MCS index, which can be [0-76] 3357 * as documented on: 3358 * 3359 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 3360 * 3361 * Anything else would be some sort of driver or 3362 * hardware error. The driver should catch hardware 3363 * errors. 3364 */ 3365 if (WARN(status->rate_idx > 76, 3366 "Rate marked as an HT rate but passed " 3367 "status->rate_idx is not " 3368 "an MCS index [0-76]: %d (0x%02x)\n", 3369 status->rate_idx, 3370 status->rate_idx)) 3371 goto drop; 3372 } else if (status->flag & RX_FLAG_VHT) { 3373 if (WARN_ONCE(status->rate_idx > 9 || 3374 !status->vht_nss || 3375 status->vht_nss > 8, 3376 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 3377 status->rate_idx, status->vht_nss)) 3378 goto drop; 3379 } else { 3380 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 3381 goto drop; 3382 rate = &sband->bitrates[status->rate_idx]; 3383 } 3384 } 3385 3386 status->rx_flags = 0; 3387 3388 /* 3389 * key references and virtual interfaces are protected using RCU 3390 * and this requires that we are in a read-side RCU section during 3391 * receive processing 3392 */ 3393 rcu_read_lock(); 3394 3395 /* 3396 * Frames with failed FCS/PLCP checksum are not returned, 3397 * all other frames are returned without radiotap header 3398 * if it was previously present. 3399 * Also, frames with less than 16 bytes are dropped. 3400 */ 3401 skb = ieee80211_rx_monitor(local, skb, rate); 3402 if (!skb) { 3403 rcu_read_unlock(); 3404 return; 3405 } 3406 3407 ieee80211_tpt_led_trig_rx(local, 3408 ((struct ieee80211_hdr *)skb->data)->frame_control, 3409 skb->len); 3410 __ieee80211_rx_handle_packet(hw, skb); 3411 3412 rcu_read_unlock(); 3413 3414 return; 3415 drop: 3416 kfree_skb(skb); 3417 } 3418 EXPORT_SYMBOL(ieee80211_rx); 3419 3420 /* This is a version of the rx handler that can be called from hard irq 3421 * context. Post the skb on the queue and schedule the tasklet */ 3422 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 3423 { 3424 struct ieee80211_local *local = hw_to_local(hw); 3425 3426 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 3427 3428 skb->pkt_type = IEEE80211_RX_MSG; 3429 skb_queue_tail(&local->skb_queue, skb); 3430 tasklet_schedule(&local->tasklet); 3431 } 3432 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 3433