1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/jiffies.h> 14 #include <linux/slab.h> 15 #include <linux/kernel.h> 16 #include <linux/skbuff.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/mac80211.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <asm/unaligned.h> 24 25 #include "ieee80211_i.h" 26 #include "driver-ops.h" 27 #include "led.h" 28 #include "mesh.h" 29 #include "wep.h" 30 #include "wpa.h" 31 #include "tkip.h" 32 #include "wme.h" 33 #include "rate.h" 34 35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len) 36 { 37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 38 39 u64_stats_update_begin(&tstats->syncp); 40 tstats->rx_packets++; 41 tstats->rx_bytes += len; 42 u64_stats_update_end(&tstats->syncp); 43 } 44 45 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, 46 enum nl80211_iftype type) 47 { 48 __le16 fc = hdr->frame_control; 49 50 if (ieee80211_is_data(fc)) { 51 if (len < 24) /* drop incorrect hdr len (data) */ 52 return NULL; 53 54 if (ieee80211_has_a4(fc)) 55 return NULL; 56 if (ieee80211_has_tods(fc)) 57 return hdr->addr1; 58 if (ieee80211_has_fromds(fc)) 59 return hdr->addr2; 60 61 return hdr->addr3; 62 } 63 64 if (ieee80211_is_mgmt(fc)) { 65 if (len < 24) /* drop incorrect hdr len (mgmt) */ 66 return NULL; 67 return hdr->addr3; 68 } 69 70 if (ieee80211_is_ctl(fc)) { 71 if (ieee80211_is_pspoll(fc)) 72 return hdr->addr1; 73 74 if (ieee80211_is_back_req(fc)) { 75 switch (type) { 76 case NL80211_IFTYPE_STATION: 77 return hdr->addr2; 78 case NL80211_IFTYPE_AP: 79 case NL80211_IFTYPE_AP_VLAN: 80 return hdr->addr1; 81 default: 82 break; /* fall through to the return */ 83 } 84 } 85 } 86 87 return NULL; 88 } 89 90 /* 91 * monitor mode reception 92 * 93 * This function cleans up the SKB, i.e. it removes all the stuff 94 * only useful for monitoring. 95 */ 96 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, 97 struct sk_buff *skb, 98 unsigned int rtap_vendor_space) 99 { 100 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { 101 if (likely(skb->len > FCS_LEN)) 102 __pskb_trim(skb, skb->len - FCS_LEN); 103 else { 104 /* driver bug */ 105 WARN_ON(1); 106 dev_kfree_skb(skb); 107 return NULL; 108 } 109 } 110 111 __pskb_pull(skb, rtap_vendor_space); 112 113 return skb; 114 } 115 116 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len, 117 unsigned int rtap_vendor_space) 118 { 119 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 120 struct ieee80211_hdr *hdr; 121 122 hdr = (void *)(skb->data + rtap_vendor_space); 123 124 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | 125 RX_FLAG_FAILED_PLCP_CRC)) 126 return true; 127 128 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space)) 129 return true; 130 131 if (ieee80211_is_ctl(hdr->frame_control) && 132 !ieee80211_is_pspoll(hdr->frame_control) && 133 !ieee80211_is_back_req(hdr->frame_control)) 134 return true; 135 136 return false; 137 } 138 139 static int 140 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, 141 struct ieee80211_rx_status *status, 142 struct sk_buff *skb) 143 { 144 int len; 145 146 /* always present fields */ 147 len = sizeof(struct ieee80211_radiotap_header) + 8; 148 149 /* allocate extra bitmaps */ 150 if (status->chains) 151 len += 4 * hweight8(status->chains); 152 153 if (ieee80211_have_rx_timestamp(status)) { 154 len = ALIGN(len, 8); 155 len += 8; 156 } 157 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 158 len += 1; 159 160 /* antenna field, if we don't have per-chain info */ 161 if (!status->chains) 162 len += 1; 163 164 /* padding for RX_FLAGS if necessary */ 165 len = ALIGN(len, 2); 166 167 if (status->flag & RX_FLAG_HT) /* HT info */ 168 len += 3; 169 170 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 171 len = ALIGN(len, 4); 172 len += 8; 173 } 174 175 if (status->flag & RX_FLAG_VHT) { 176 len = ALIGN(len, 2); 177 len += 12; 178 } 179 180 if (status->chains) { 181 /* antenna and antenna signal fields */ 182 len += 2 * hweight8(status->chains); 183 } 184 185 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 186 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data; 187 188 /* vendor presence bitmap */ 189 len += 4; 190 /* alignment for fixed 6-byte vendor data header */ 191 len = ALIGN(len, 2); 192 /* vendor data header */ 193 len += 6; 194 if (WARN_ON(rtap->align == 0)) 195 rtap->align = 1; 196 len = ALIGN(len, rtap->align); 197 len += rtap->len + rtap->pad; 198 } 199 200 return len; 201 } 202 203 /* 204 * ieee80211_add_rx_radiotap_header - add radiotap header 205 * 206 * add a radiotap header containing all the fields which the hardware provided. 207 */ 208 static void 209 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 210 struct sk_buff *skb, 211 struct ieee80211_rate *rate, 212 int rtap_len, bool has_fcs) 213 { 214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 215 struct ieee80211_radiotap_header *rthdr; 216 unsigned char *pos; 217 __le32 *it_present; 218 u32 it_present_val; 219 u16 rx_flags = 0; 220 u16 channel_flags = 0; 221 int mpdulen, chain; 222 unsigned long chains = status->chains; 223 struct ieee80211_vendor_radiotap rtap = {}; 224 225 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 226 rtap = *(struct ieee80211_vendor_radiotap *)skb->data; 227 /* rtap.len and rtap.pad are undone immediately */ 228 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad); 229 } 230 231 mpdulen = skb->len; 232 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) 233 mpdulen += FCS_LEN; 234 235 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); 236 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad); 237 it_present = &rthdr->it_present; 238 239 /* radiotap header, set always present flags */ 240 rthdr->it_len = cpu_to_le16(rtap_len); 241 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | 242 BIT(IEEE80211_RADIOTAP_CHANNEL) | 243 BIT(IEEE80211_RADIOTAP_RX_FLAGS); 244 245 if (!status->chains) 246 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); 247 248 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 249 it_present_val |= 250 BIT(IEEE80211_RADIOTAP_EXT) | 251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); 252 put_unaligned_le32(it_present_val, it_present); 253 it_present++; 254 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | 255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 256 } 257 258 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 259 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | 260 BIT(IEEE80211_RADIOTAP_EXT); 261 put_unaligned_le32(it_present_val, it_present); 262 it_present++; 263 it_present_val = rtap.present; 264 } 265 266 put_unaligned_le32(it_present_val, it_present); 267 268 pos = (void *)(it_present + 1); 269 270 /* the order of the following fields is important */ 271 272 /* IEEE80211_RADIOTAP_TSFT */ 273 if (ieee80211_have_rx_timestamp(status)) { 274 /* padding */ 275 while ((pos - (u8 *)rthdr) & 7) 276 *pos++ = 0; 277 put_unaligned_le64( 278 ieee80211_calculate_rx_timestamp(local, status, 279 mpdulen, 0), 280 pos); 281 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 282 pos += 8; 283 } 284 285 /* IEEE80211_RADIOTAP_FLAGS */ 286 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 287 *pos |= IEEE80211_RADIOTAP_F_FCS; 288 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 289 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 290 if (status->flag & RX_FLAG_SHORTPRE) 291 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 292 pos++; 293 294 /* IEEE80211_RADIOTAP_RATE */ 295 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) { 296 /* 297 * Without rate information don't add it. If we have, 298 * MCS information is a separate field in radiotap, 299 * added below. The byte here is needed as padding 300 * for the channel though, so initialise it to 0. 301 */ 302 *pos = 0; 303 } else { 304 int shift = 0; 305 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 306 if (status->flag & RX_FLAG_10MHZ) 307 shift = 1; 308 else if (status->flag & RX_FLAG_5MHZ) 309 shift = 2; 310 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); 311 } 312 pos++; 313 314 /* IEEE80211_RADIOTAP_CHANNEL */ 315 put_unaligned_le16(status->freq, pos); 316 pos += 2; 317 if (status->flag & RX_FLAG_10MHZ) 318 channel_flags |= IEEE80211_CHAN_HALF; 319 else if (status->flag & RX_FLAG_5MHZ) 320 channel_flags |= IEEE80211_CHAN_QUARTER; 321 322 if (status->band == IEEE80211_BAND_5GHZ) 323 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; 324 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) 325 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; 326 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 327 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; 328 else if (rate) 329 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; 330 else 331 channel_flags |= IEEE80211_CHAN_2GHZ; 332 put_unaligned_le16(channel_flags, pos); 333 pos += 2; 334 335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 336 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && 337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 338 *pos = status->signal; 339 rthdr->it_present |= 340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 341 pos++; 342 } 343 344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 345 346 if (!status->chains) { 347 /* IEEE80211_RADIOTAP_ANTENNA */ 348 *pos = status->antenna; 349 pos++; 350 } 351 352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 353 354 /* IEEE80211_RADIOTAP_RX_FLAGS */ 355 /* ensure 2 byte alignment for the 2 byte field as required */ 356 if ((pos - (u8 *)rthdr) & 1) 357 *pos++ = 0; 358 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 359 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 360 put_unaligned_le16(rx_flags, pos); 361 pos += 2; 362 363 if (status->flag & RX_FLAG_HT) { 364 unsigned int stbc; 365 366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 367 *pos++ = local->hw.radiotap_mcs_details; 368 *pos = 0; 369 if (status->flag & RX_FLAG_SHORT_GI) 370 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 371 if (status->flag & RX_FLAG_40MHZ) 372 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 373 if (status->flag & RX_FLAG_HT_GF) 374 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; 375 if (status->flag & RX_FLAG_LDPC) 376 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; 377 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT; 378 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; 379 pos++; 380 *pos++ = status->rate_idx; 381 } 382 383 if (status->flag & RX_FLAG_AMPDU_DETAILS) { 384 u16 flags = 0; 385 386 /* ensure 4 byte alignment */ 387 while ((pos - (u8 *)rthdr) & 3) 388 pos++; 389 rthdr->it_present |= 390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); 391 put_unaligned_le32(status->ampdu_reference, pos); 392 pos += 4; 393 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) 394 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; 395 if (status->flag & RX_FLAG_AMPDU_IS_LAST) 396 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; 397 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) 398 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; 399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; 401 put_unaligned_le16(flags, pos); 402 pos += 2; 403 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) 404 *pos++ = status->ampdu_delimiter_crc; 405 else 406 *pos++ = 0; 407 *pos++ = 0; 408 } 409 410 if (status->flag & RX_FLAG_VHT) { 411 u16 known = local->hw.radiotap_vht_details; 412 413 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 414 put_unaligned_le16(known, pos); 415 pos += 2; 416 /* flags */ 417 if (status->flag & RX_FLAG_SHORT_GI) 418 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 419 /* in VHT, STBC is binary */ 420 if (status->flag & RX_FLAG_STBC_MASK) 421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; 422 if (status->vht_flag & RX_VHT_FLAG_BF) 423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; 424 pos++; 425 /* bandwidth */ 426 if (status->vht_flag & RX_VHT_FLAG_80MHZ) 427 *pos++ = 4; 428 else if (status->vht_flag & RX_VHT_FLAG_160MHZ) 429 *pos++ = 11; 430 else if (status->flag & RX_FLAG_40MHZ) 431 *pos++ = 1; 432 else /* 20 MHz */ 433 *pos++ = 0; 434 /* MCS/NSS */ 435 *pos = (status->rate_idx << 4) | status->vht_nss; 436 pos += 4; 437 /* coding field */ 438 if (status->flag & RX_FLAG_LDPC) 439 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; 440 pos++; 441 /* group ID */ 442 pos++; 443 /* partial_aid */ 444 pos += 2; 445 } 446 447 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { 448 *pos++ = status->chain_signal[chain]; 449 *pos++ = chain; 450 } 451 452 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { 453 /* ensure 2 byte alignment for the vendor field as required */ 454 if ((pos - (u8 *)rthdr) & 1) 455 *pos++ = 0; 456 *pos++ = rtap.oui[0]; 457 *pos++ = rtap.oui[1]; 458 *pos++ = rtap.oui[2]; 459 *pos++ = rtap.subns; 460 put_unaligned_le16(rtap.len, pos); 461 pos += 2; 462 /* align the actual payload as requested */ 463 while ((pos - (u8 *)rthdr) & (rtap.align - 1)) 464 *pos++ = 0; 465 /* data (and possible padding) already follows */ 466 } 467 } 468 469 /* 470 * This function copies a received frame to all monitor interfaces and 471 * returns a cleaned-up SKB that no longer includes the FCS nor the 472 * radiotap header the driver might have added. 473 */ 474 static struct sk_buff * 475 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 476 struct ieee80211_rate *rate) 477 { 478 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 479 struct ieee80211_sub_if_data *sdata; 480 int rt_hdrlen, needed_headroom; 481 struct sk_buff *skb, *skb2; 482 struct net_device *prev_dev = NULL; 483 int present_fcs_len = 0; 484 unsigned int rtap_vendor_space = 0; 485 486 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) { 487 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data; 488 489 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad; 490 } 491 492 /* 493 * First, we may need to make a copy of the skb because 494 * (1) we need to modify it for radiotap (if not present), and 495 * (2) the other RX handlers will modify the skb we got. 496 * 497 * We don't need to, of course, if we aren't going to return 498 * the SKB because it has a bad FCS/PLCP checksum. 499 */ 500 501 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) 502 present_fcs_len = FCS_LEN; 503 504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */ 505 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) { 506 dev_kfree_skb(origskb); 507 return NULL; 508 } 509 510 if (!local->monitors) { 511 if (should_drop_frame(origskb, present_fcs_len, 512 rtap_vendor_space)) { 513 dev_kfree_skb(origskb); 514 return NULL; 515 } 516 517 return remove_monitor_info(local, origskb, rtap_vendor_space); 518 } 519 520 /* room for the radiotap header based on driver features */ 521 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb); 522 needed_headroom = rt_hdrlen - rtap_vendor_space; 523 524 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) { 525 /* only need to expand headroom if necessary */ 526 skb = origskb; 527 origskb = NULL; 528 529 /* 530 * This shouldn't trigger often because most devices have an 531 * RX header they pull before we get here, and that should 532 * be big enough for our radiotap information. We should 533 * probably export the length to drivers so that we can have 534 * them allocate enough headroom to start with. 535 */ 536 if (skb_headroom(skb) < needed_headroom && 537 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 538 dev_kfree_skb(skb); 539 return NULL; 540 } 541 } else { 542 /* 543 * Need to make a copy and possibly remove radiotap header 544 * and FCS from the original. 545 */ 546 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); 547 548 origskb = remove_monitor_info(local, origskb, 549 rtap_vendor_space); 550 551 if (!skb) 552 return origskb; 553 } 554 555 /* prepend radiotap information */ 556 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); 557 558 skb_reset_mac_header(skb); 559 skb->ip_summed = CHECKSUM_UNNECESSARY; 560 skb->pkt_type = PACKET_OTHERHOST; 561 skb->protocol = htons(ETH_P_802_2); 562 563 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 564 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) 565 continue; 566 567 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) 568 continue; 569 570 if (!ieee80211_sdata_running(sdata)) 571 continue; 572 573 if (prev_dev) { 574 skb2 = skb_clone(skb, GFP_ATOMIC); 575 if (skb2) { 576 skb2->dev = prev_dev; 577 netif_receive_skb(skb2); 578 } 579 } 580 581 prev_dev = sdata->dev; 582 ieee80211_rx_stats(sdata->dev, skb->len); 583 } 584 585 if (prev_dev) { 586 skb->dev = prev_dev; 587 netif_receive_skb(skb); 588 } else 589 dev_kfree_skb(skb); 590 591 return origskb; 592 } 593 594 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 595 { 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 598 int tid, seqno_idx, security_idx; 599 600 /* does the frame have a qos control field? */ 601 if (ieee80211_is_data_qos(hdr->frame_control)) { 602 u8 *qc = ieee80211_get_qos_ctl(hdr); 603 /* frame has qos control */ 604 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 605 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 606 status->rx_flags |= IEEE80211_RX_AMSDU; 607 608 seqno_idx = tid; 609 security_idx = tid; 610 } else { 611 /* 612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 613 * 614 * Sequence numbers for management frames, QoS data 615 * frames with a broadcast/multicast address in the 616 * Address 1 field, and all non-QoS data frames sent 617 * by QoS STAs are assigned using an additional single 618 * modulo-4096 counter, [...] 619 * 620 * We also use that counter for non-QoS STAs. 621 */ 622 seqno_idx = IEEE80211_NUM_TIDS; 623 security_idx = 0; 624 if (ieee80211_is_mgmt(hdr->frame_control)) 625 security_idx = IEEE80211_NUM_TIDS; 626 tid = 0; 627 } 628 629 rx->seqno_idx = seqno_idx; 630 rx->security_idx = security_idx; 631 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 632 * For now, set skb->priority to 0 for other cases. */ 633 rx->skb->priority = (tid > 7) ? 0 : tid; 634 } 635 636 /** 637 * DOC: Packet alignment 638 * 639 * Drivers always need to pass packets that are aligned to two-byte boundaries 640 * to the stack. 641 * 642 * Additionally, should, if possible, align the payload data in a way that 643 * guarantees that the contained IP header is aligned to a four-byte 644 * boundary. In the case of regular frames, this simply means aligning the 645 * payload to a four-byte boundary (because either the IP header is directly 646 * contained, or IV/RFC1042 headers that have a length divisible by four are 647 * in front of it). If the payload data is not properly aligned and the 648 * architecture doesn't support efficient unaligned operations, mac80211 649 * will align the data. 650 * 651 * With A-MSDU frames, however, the payload data address must yield two modulo 652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 653 * push the IP header further back to a multiple of four again. Thankfully, the 654 * specs were sane enough this time around to require padding each A-MSDU 655 * subframe to a length that is a multiple of four. 656 * 657 * Padding like Atheros hardware adds which is between the 802.11 header and 658 * the payload is not supported, the driver is required to move the 802.11 659 * header to be directly in front of the payload in that case. 660 */ 661 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 662 { 663 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 664 WARN_ON_ONCE((unsigned long)rx->skb->data & 1); 665 #endif 666 } 667 668 669 /* rx handlers */ 670 671 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 672 { 673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 674 675 if (is_multicast_ether_addr(hdr->addr1)) 676 return 0; 677 678 return ieee80211_is_robust_mgmt_frame(skb); 679 } 680 681 682 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 683 { 684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 685 686 if (!is_multicast_ether_addr(hdr->addr1)) 687 return 0; 688 689 return ieee80211_is_robust_mgmt_frame(skb); 690 } 691 692 693 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 694 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 695 { 696 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 697 struct ieee80211_mmie *mmie; 698 struct ieee80211_mmie_16 *mmie16; 699 700 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) 701 return -1; 702 703 if (!ieee80211_is_robust_mgmt_frame(skb)) 704 return -1; /* not a robust management frame */ 705 706 mmie = (struct ieee80211_mmie *) 707 (skb->data + skb->len - sizeof(*mmie)); 708 if (mmie->element_id == WLAN_EID_MMIE && 709 mmie->length == sizeof(*mmie) - 2) 710 return le16_to_cpu(mmie->key_id); 711 712 mmie16 = (struct ieee80211_mmie_16 *) 713 (skb->data + skb->len - sizeof(*mmie16)); 714 if (skb->len >= 24 + sizeof(*mmie16) && 715 mmie16->element_id == WLAN_EID_MMIE && 716 mmie16->length == sizeof(*mmie16) - 2) 717 return le16_to_cpu(mmie16->key_id); 718 719 return -1; 720 } 721 722 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs, 723 struct sk_buff *skb) 724 { 725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 726 __le16 fc; 727 int hdrlen; 728 u8 keyid; 729 730 fc = hdr->frame_control; 731 hdrlen = ieee80211_hdrlen(fc); 732 733 if (skb->len < hdrlen + cs->hdr_len) 734 return -EINVAL; 735 736 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1); 737 keyid &= cs->key_idx_mask; 738 keyid >>= cs->key_idx_shift; 739 740 return keyid; 741 } 742 743 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 744 { 745 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 746 char *dev_addr = rx->sdata->vif.addr; 747 748 if (ieee80211_is_data(hdr->frame_control)) { 749 if (is_multicast_ether_addr(hdr->addr1)) { 750 if (ieee80211_has_tods(hdr->frame_control) || 751 !ieee80211_has_fromds(hdr->frame_control)) 752 return RX_DROP_MONITOR; 753 if (ether_addr_equal(hdr->addr3, dev_addr)) 754 return RX_DROP_MONITOR; 755 } else { 756 if (!ieee80211_has_a4(hdr->frame_control)) 757 return RX_DROP_MONITOR; 758 if (ether_addr_equal(hdr->addr4, dev_addr)) 759 return RX_DROP_MONITOR; 760 } 761 } 762 763 /* If there is not an established peer link and this is not a peer link 764 * establisment frame, beacon or probe, drop the frame. 765 */ 766 767 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 768 struct ieee80211_mgmt *mgmt; 769 770 if (!ieee80211_is_mgmt(hdr->frame_control)) 771 return RX_DROP_MONITOR; 772 773 if (ieee80211_is_action(hdr->frame_control)) { 774 u8 category; 775 776 /* make sure category field is present */ 777 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) 778 return RX_DROP_MONITOR; 779 780 mgmt = (struct ieee80211_mgmt *)hdr; 781 category = mgmt->u.action.category; 782 if (category != WLAN_CATEGORY_MESH_ACTION && 783 category != WLAN_CATEGORY_SELF_PROTECTED) 784 return RX_DROP_MONITOR; 785 return RX_CONTINUE; 786 } 787 788 if (ieee80211_is_probe_req(hdr->frame_control) || 789 ieee80211_is_probe_resp(hdr->frame_control) || 790 ieee80211_is_beacon(hdr->frame_control) || 791 ieee80211_is_auth(hdr->frame_control)) 792 return RX_CONTINUE; 793 794 return RX_DROP_MONITOR; 795 } 796 797 return RX_CONTINUE; 798 } 799 800 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, 801 struct tid_ampdu_rx *tid_agg_rx, 802 int index, 803 struct sk_buff_head *frames) 804 { 805 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; 806 struct sk_buff *skb; 807 struct ieee80211_rx_status *status; 808 809 lockdep_assert_held(&tid_agg_rx->reorder_lock); 810 811 if (skb_queue_empty(skb_list)) 812 goto no_frame; 813 814 if (!ieee80211_rx_reorder_ready(skb_list)) { 815 __skb_queue_purge(skb_list); 816 goto no_frame; 817 } 818 819 /* release frames from the reorder ring buffer */ 820 tid_agg_rx->stored_mpdu_num--; 821 while ((skb = __skb_dequeue(skb_list))) { 822 status = IEEE80211_SKB_RXCB(skb); 823 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 824 __skb_queue_tail(frames, skb); 825 } 826 827 no_frame: 828 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); 829 } 830 831 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, 832 struct tid_ampdu_rx *tid_agg_rx, 833 u16 head_seq_num, 834 struct sk_buff_head *frames) 835 { 836 int index; 837 838 lockdep_assert_held(&tid_agg_rx->reorder_lock); 839 840 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { 841 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 842 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 843 frames); 844 } 845 } 846 847 /* 848 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 849 * the skb was added to the buffer longer than this time ago, the earlier 850 * frames that have not yet been received are assumed to be lost and the skb 851 * can be released for processing. This may also release other skb's from the 852 * reorder buffer if there are no additional gaps between the frames. 853 * 854 * Callers must hold tid_agg_rx->reorder_lock. 855 */ 856 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 857 858 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, 859 struct tid_ampdu_rx *tid_agg_rx, 860 struct sk_buff_head *frames) 861 { 862 int index, i, j; 863 864 lockdep_assert_held(&tid_agg_rx->reorder_lock); 865 866 /* release the buffer until next missing frame */ 867 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 868 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) && 869 tid_agg_rx->stored_mpdu_num) { 870 /* 871 * No buffers ready to be released, but check whether any 872 * frames in the reorder buffer have timed out. 873 */ 874 int skipped = 1; 875 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 876 j = (j + 1) % tid_agg_rx->buf_size) { 877 if (!ieee80211_rx_reorder_ready( 878 &tid_agg_rx->reorder_buf[j])) { 879 skipped++; 880 continue; 881 } 882 if (skipped && 883 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 884 HT_RX_REORDER_BUF_TIMEOUT)) 885 goto set_release_timer; 886 887 /* don't leave incomplete A-MSDUs around */ 888 for (i = (index + 1) % tid_agg_rx->buf_size; i != j; 889 i = (i + 1) % tid_agg_rx->buf_size) 890 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]); 891 892 ht_dbg_ratelimited(sdata, 893 "release an RX reorder frame due to timeout on earlier frames\n"); 894 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, 895 frames); 896 897 /* 898 * Increment the head seq# also for the skipped slots. 899 */ 900 tid_agg_rx->head_seq_num = 901 (tid_agg_rx->head_seq_num + 902 skipped) & IEEE80211_SN_MASK; 903 skipped = 0; 904 } 905 } else while (ieee80211_rx_reorder_ready( 906 &tid_agg_rx->reorder_buf[index])) { 907 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, 908 frames); 909 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 910 } 911 912 if (tid_agg_rx->stored_mpdu_num) { 913 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; 914 915 for (; j != (index - 1) % tid_agg_rx->buf_size; 916 j = (j + 1) % tid_agg_rx->buf_size) { 917 if (ieee80211_rx_reorder_ready( 918 &tid_agg_rx->reorder_buf[j])) 919 break; 920 } 921 922 set_release_timer: 923 924 if (!tid_agg_rx->removed) 925 mod_timer(&tid_agg_rx->reorder_timer, 926 tid_agg_rx->reorder_time[j] + 1 + 927 HT_RX_REORDER_BUF_TIMEOUT); 928 } else { 929 del_timer(&tid_agg_rx->reorder_timer); 930 } 931 } 932 933 /* 934 * As this function belongs to the RX path it must be under 935 * rcu_read_lock protection. It returns false if the frame 936 * can be processed immediately, true if it was consumed. 937 */ 938 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, 939 struct tid_ampdu_rx *tid_agg_rx, 940 struct sk_buff *skb, 941 struct sk_buff_head *frames) 942 { 943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 945 u16 sc = le16_to_cpu(hdr->seq_ctrl); 946 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 947 u16 head_seq_num, buf_size; 948 int index; 949 bool ret = true; 950 951 spin_lock(&tid_agg_rx->reorder_lock); 952 953 /* 954 * Offloaded BA sessions have no known starting sequence number so pick 955 * one from first Rxed frame for this tid after BA was started. 956 */ 957 if (unlikely(tid_agg_rx->auto_seq)) { 958 tid_agg_rx->auto_seq = false; 959 tid_agg_rx->ssn = mpdu_seq_num; 960 tid_agg_rx->head_seq_num = mpdu_seq_num; 961 } 962 963 buf_size = tid_agg_rx->buf_size; 964 head_seq_num = tid_agg_rx->head_seq_num; 965 966 /* frame with out of date sequence number */ 967 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { 968 dev_kfree_skb(skb); 969 goto out; 970 } 971 972 /* 973 * If frame the sequence number exceeds our buffering window 974 * size release some previous frames to make room for this one. 975 */ 976 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { 977 head_seq_num = ieee80211_sn_inc( 978 ieee80211_sn_sub(mpdu_seq_num, buf_size)); 979 /* release stored frames up to new head to stack */ 980 ieee80211_release_reorder_frames(sdata, tid_agg_rx, 981 head_seq_num, frames); 982 } 983 984 /* Now the new frame is always in the range of the reordering buffer */ 985 986 index = mpdu_seq_num % tid_agg_rx->buf_size; 987 988 /* check if we already stored this frame */ 989 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) { 990 dev_kfree_skb(skb); 991 goto out; 992 } 993 994 /* 995 * If the current MPDU is in the right order and nothing else 996 * is stored we can process it directly, no need to buffer it. 997 * If it is first but there's something stored, we may be able 998 * to release frames after this one. 999 */ 1000 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 1001 tid_agg_rx->stored_mpdu_num == 0) { 1002 if (!(status->flag & RX_FLAG_AMSDU_MORE)) 1003 tid_agg_rx->head_seq_num = 1004 ieee80211_sn_inc(tid_agg_rx->head_seq_num); 1005 ret = false; 1006 goto out; 1007 } 1008 1009 /* put the frame in the reordering buffer */ 1010 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); 1011 if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1012 tid_agg_rx->reorder_time[index] = jiffies; 1013 tid_agg_rx->stored_mpdu_num++; 1014 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); 1015 } 1016 1017 out: 1018 spin_unlock(&tid_agg_rx->reorder_lock); 1019 return ret; 1020 } 1021 1022 /* 1023 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 1024 * true if the MPDU was buffered, false if it should be processed. 1025 */ 1026 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, 1027 struct sk_buff_head *frames) 1028 { 1029 struct sk_buff *skb = rx->skb; 1030 struct ieee80211_local *local = rx->local; 1031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1032 struct sta_info *sta = rx->sta; 1033 struct tid_ampdu_rx *tid_agg_rx; 1034 u16 sc; 1035 u8 tid, ack_policy; 1036 1037 if (!ieee80211_is_data_qos(hdr->frame_control) || 1038 is_multicast_ether_addr(hdr->addr1)) 1039 goto dont_reorder; 1040 1041 /* 1042 * filter the QoS data rx stream according to 1043 * STA/TID and check if this STA/TID is on aggregation 1044 */ 1045 1046 if (!sta) 1047 goto dont_reorder; 1048 1049 ack_policy = *ieee80211_get_qos_ctl(hdr) & 1050 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 1051 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 1052 1053 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 1054 if (!tid_agg_rx) 1055 goto dont_reorder; 1056 1057 /* qos null data frames are excluded */ 1058 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 1059 goto dont_reorder; 1060 1061 /* not part of a BA session */ 1062 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 1063 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) 1064 goto dont_reorder; 1065 1066 /* new, potentially un-ordered, ampdu frame - process it */ 1067 1068 /* reset session timer */ 1069 if (tid_agg_rx->timeout) 1070 tid_agg_rx->last_rx = jiffies; 1071 1072 /* if this mpdu is fragmented - terminate rx aggregation session */ 1073 sc = le16_to_cpu(hdr->seq_ctrl); 1074 if (sc & IEEE80211_SCTL_FRAG) { 1075 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 1076 skb_queue_tail(&rx->sdata->skb_queue, skb); 1077 ieee80211_queue_work(&local->hw, &rx->sdata->work); 1078 return; 1079 } 1080 1081 /* 1082 * No locking needed -- we will only ever process one 1083 * RX packet at a time, and thus own tid_agg_rx. All 1084 * other code manipulating it needs to (and does) make 1085 * sure that we cannot get to it any more before doing 1086 * anything with it. 1087 */ 1088 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, 1089 frames)) 1090 return; 1091 1092 dont_reorder: 1093 __skb_queue_tail(frames, skb); 1094 } 1095 1096 static ieee80211_rx_result debug_noinline 1097 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) 1098 { 1099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1100 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1101 1102 /* 1103 * Drop duplicate 802.11 retransmissions 1104 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 1105 */ 1106 1107 if (rx->skb->len < 24) 1108 return RX_CONTINUE; 1109 1110 if (ieee80211_is_ctl(hdr->frame_control) || 1111 ieee80211_is_qos_nullfunc(hdr->frame_control) || 1112 is_multicast_ether_addr(hdr->addr1)) 1113 return RX_CONTINUE; 1114 1115 if (!rx->sta) 1116 return RX_CONTINUE; 1117 1118 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 1119 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { 1120 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); 1121 rx->sta->rx_stats.num_duplicates++; 1122 return RX_DROP_UNUSABLE; 1123 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { 1124 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 1125 } 1126 1127 return RX_CONTINUE; 1128 } 1129 1130 static ieee80211_rx_result debug_noinline 1131 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 1132 { 1133 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1134 1135 /* Drop disallowed frame classes based on STA auth/assoc state; 1136 * IEEE 802.11, Chap 5.5. 1137 * 1138 * mac80211 filters only based on association state, i.e. it drops 1139 * Class 3 frames from not associated stations. hostapd sends 1140 * deauth/disassoc frames when needed. In addition, hostapd is 1141 * responsible for filtering on both auth and assoc states. 1142 */ 1143 1144 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1145 return ieee80211_rx_mesh_check(rx); 1146 1147 if (unlikely((ieee80211_is_data(hdr->frame_control) || 1148 ieee80211_is_pspoll(hdr->frame_control)) && 1149 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 1150 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 1151 rx->sdata->vif.type != NL80211_IFTYPE_OCB && 1152 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 1153 /* 1154 * accept port control frames from the AP even when it's not 1155 * yet marked ASSOC to prevent a race where we don't set the 1156 * assoc bit quickly enough before it sends the first frame 1157 */ 1158 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1159 ieee80211_is_data_present(hdr->frame_control)) { 1160 unsigned int hdrlen; 1161 __be16 ethertype; 1162 1163 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1164 1165 if (rx->skb->len < hdrlen + 8) 1166 return RX_DROP_MONITOR; 1167 1168 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); 1169 if (ethertype == rx->sdata->control_port_protocol) 1170 return RX_CONTINUE; 1171 } 1172 1173 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 1174 cfg80211_rx_spurious_frame(rx->sdata->dev, 1175 hdr->addr2, 1176 GFP_ATOMIC)) 1177 return RX_DROP_UNUSABLE; 1178 1179 return RX_DROP_MONITOR; 1180 } 1181 1182 return RX_CONTINUE; 1183 } 1184 1185 1186 static ieee80211_rx_result debug_noinline 1187 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1188 { 1189 struct ieee80211_local *local; 1190 struct ieee80211_hdr *hdr; 1191 struct sk_buff *skb; 1192 1193 local = rx->local; 1194 skb = rx->skb; 1195 hdr = (struct ieee80211_hdr *) skb->data; 1196 1197 if (!local->pspolling) 1198 return RX_CONTINUE; 1199 1200 if (!ieee80211_has_fromds(hdr->frame_control)) 1201 /* this is not from AP */ 1202 return RX_CONTINUE; 1203 1204 if (!ieee80211_is_data(hdr->frame_control)) 1205 return RX_CONTINUE; 1206 1207 if (!ieee80211_has_moredata(hdr->frame_control)) { 1208 /* AP has no more frames buffered for us */ 1209 local->pspolling = false; 1210 return RX_CONTINUE; 1211 } 1212 1213 /* more data bit is set, let's request a new frame from the AP */ 1214 ieee80211_send_pspoll(local, rx->sdata); 1215 1216 return RX_CONTINUE; 1217 } 1218 1219 static void sta_ps_start(struct sta_info *sta) 1220 { 1221 struct ieee80211_sub_if_data *sdata = sta->sdata; 1222 struct ieee80211_local *local = sdata->local; 1223 struct ps_data *ps; 1224 int tid; 1225 1226 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1227 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1228 ps = &sdata->bss->ps; 1229 else 1230 return; 1231 1232 atomic_inc(&ps->num_sta_ps); 1233 set_sta_flag(sta, WLAN_STA_PS_STA); 1234 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1235 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1236 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", 1237 sta->sta.addr, sta->sta.aid); 1238 1239 ieee80211_clear_fast_xmit(sta); 1240 1241 if (!sta->sta.txq[0]) 1242 return; 1243 1244 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) { 1245 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]); 1246 1247 if (!skb_queue_len(&txqi->queue)) 1248 set_bit(tid, &sta->txq_buffered_tids); 1249 else 1250 clear_bit(tid, &sta->txq_buffered_tids); 1251 } 1252 } 1253 1254 static void sta_ps_end(struct sta_info *sta) 1255 { 1256 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", 1257 sta->sta.addr, sta->sta.aid); 1258 1259 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1260 /* 1261 * Clear the flag only if the other one is still set 1262 * so that the TX path won't start TX'ing new frames 1263 * directly ... In the case that the driver flag isn't 1264 * set ieee80211_sta_ps_deliver_wakeup() will clear it. 1265 */ 1266 clear_sta_flag(sta, WLAN_STA_PS_STA); 1267 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", 1268 sta->sta.addr, sta->sta.aid); 1269 return; 1270 } 1271 1272 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1273 clear_sta_flag(sta, WLAN_STA_PS_STA); 1274 ieee80211_sta_ps_deliver_wakeup(sta); 1275 } 1276 1277 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) 1278 { 1279 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1280 bool in_ps; 1281 1282 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); 1283 1284 /* Don't let the same PS state be set twice */ 1285 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); 1286 if ((start && in_ps) || (!start && !in_ps)) 1287 return -EINVAL; 1288 1289 if (start) 1290 sta_ps_start(sta); 1291 else 1292 sta_ps_end(sta); 1293 1294 return 0; 1295 } 1296 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1297 1298 static ieee80211_rx_result debug_noinline 1299 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1300 { 1301 struct ieee80211_sub_if_data *sdata = rx->sdata; 1302 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1303 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1304 int tid, ac; 1305 1306 if (!rx->sta) 1307 return RX_CONTINUE; 1308 1309 if (sdata->vif.type != NL80211_IFTYPE_AP && 1310 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1311 return RX_CONTINUE; 1312 1313 /* 1314 * The device handles station powersave, so don't do anything about 1315 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1316 * it to mac80211 since they're handled.) 1317 */ 1318 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) 1319 return RX_CONTINUE; 1320 1321 /* 1322 * Don't do anything if the station isn't already asleep. In 1323 * the uAPSD case, the station will probably be marked asleep, 1324 * in the PS-Poll case the station must be confused ... 1325 */ 1326 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1327 return RX_CONTINUE; 1328 1329 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1330 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { 1331 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1332 ieee80211_sta_ps_deliver_poll_response(rx->sta); 1333 else 1334 set_sta_flag(rx->sta, WLAN_STA_PSPOLL); 1335 } 1336 1337 /* Free PS Poll skb here instead of returning RX_DROP that would 1338 * count as an dropped frame. */ 1339 dev_kfree_skb(rx->skb); 1340 1341 return RX_QUEUED; 1342 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1343 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1344 ieee80211_has_pm(hdr->frame_control) && 1345 (ieee80211_is_data_qos(hdr->frame_control) || 1346 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1347 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 1348 ac = ieee802_1d_to_ac[tid & 7]; 1349 1350 /* 1351 * If this AC is not trigger-enabled do nothing. 1352 * 1353 * NB: This could/should check a separate bitmap of trigger- 1354 * enabled queues, but for now we only implement uAPSD w/o 1355 * TSPEC changes to the ACs, so they're always the same. 1356 */ 1357 if (!(rx->sta->sta.uapsd_queues & BIT(ac))) 1358 return RX_CONTINUE; 1359 1360 /* if we are in a service period, do nothing */ 1361 if (test_sta_flag(rx->sta, WLAN_STA_SP)) 1362 return RX_CONTINUE; 1363 1364 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1365 ieee80211_sta_ps_deliver_uapsd(rx->sta); 1366 else 1367 set_sta_flag(rx->sta, WLAN_STA_UAPSD); 1368 } 1369 1370 return RX_CONTINUE; 1371 } 1372 1373 static ieee80211_rx_result debug_noinline 1374 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1375 { 1376 struct sta_info *sta = rx->sta; 1377 struct sk_buff *skb = rx->skb; 1378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1380 int i; 1381 1382 if (!sta) 1383 return RX_CONTINUE; 1384 1385 /* 1386 * Update last_rx only for IBSS packets which are for the current 1387 * BSSID and for station already AUTHORIZED to avoid keeping the 1388 * current IBSS network alive in cases where other STAs start 1389 * using different BSSID. This will also give the station another 1390 * chance to restart the authentication/authorization in case 1391 * something went wrong the first time. 1392 */ 1393 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1394 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1395 NL80211_IFTYPE_ADHOC); 1396 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && 1397 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { 1398 sta->rx_stats.last_rx = jiffies; 1399 if (ieee80211_is_data(hdr->frame_control) && 1400 !is_multicast_ether_addr(hdr->addr1)) { 1401 sta->rx_stats.last_rate_idx = 1402 status->rate_idx; 1403 sta->rx_stats.last_rate_flag = 1404 status->flag; 1405 sta->rx_stats.last_rate_vht_flag = 1406 status->vht_flag; 1407 sta->rx_stats.last_rate_vht_nss = 1408 status->vht_nss; 1409 } 1410 } 1411 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { 1412 sta->rx_stats.last_rx = jiffies; 1413 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1414 /* 1415 * Mesh beacons will update last_rx when if they are found to 1416 * match the current local configuration when processed. 1417 */ 1418 sta->rx_stats.last_rx = jiffies; 1419 if (ieee80211_is_data(hdr->frame_control)) { 1420 sta->rx_stats.last_rate_idx = status->rate_idx; 1421 sta->rx_stats.last_rate_flag = status->flag; 1422 sta->rx_stats.last_rate_vht_flag = status->vht_flag; 1423 sta->rx_stats.last_rate_vht_nss = status->vht_nss; 1424 } 1425 } 1426 1427 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1428 ieee80211_sta_rx_notify(rx->sdata, hdr); 1429 1430 sta->rx_stats.fragments++; 1431 sta->rx_stats.bytes += rx->skb->len; 1432 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { 1433 sta->rx_stats.last_signal = status->signal; 1434 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal); 1435 } 1436 1437 if (status->chains) { 1438 sta->rx_stats.chains = status->chains; 1439 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { 1440 int signal = status->chain_signal[i]; 1441 1442 if (!(status->chains & BIT(i))) 1443 continue; 1444 1445 sta->rx_stats.chain_signal_last[i] = signal; 1446 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i], 1447 -signal); 1448 } 1449 } 1450 1451 /* 1452 * Change STA power saving mode only at the end of a frame 1453 * exchange sequence. 1454 */ 1455 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && 1456 !ieee80211_has_morefrags(hdr->frame_control) && 1457 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1458 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1459 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1460 /* PM bit is only checked in frames where it isn't reserved, 1461 * in AP mode it's reserved in non-bufferable management frames 1462 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field) 1463 */ 1464 (!ieee80211_is_mgmt(hdr->frame_control) || 1465 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) { 1466 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1467 if (!ieee80211_has_pm(hdr->frame_control)) 1468 sta_ps_end(sta); 1469 } else { 1470 if (ieee80211_has_pm(hdr->frame_control)) 1471 sta_ps_start(sta); 1472 } 1473 } 1474 1475 /* mesh power save support */ 1476 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 1477 ieee80211_mps_rx_h_sta_process(sta, hdr); 1478 1479 /* 1480 * Drop (qos-)data::nullfunc frames silently, since they 1481 * are used only to control station power saving mode. 1482 */ 1483 if (ieee80211_is_nullfunc(hdr->frame_control) || 1484 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1485 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1486 1487 /* 1488 * If we receive a 4-addr nullfunc frame from a STA 1489 * that was not moved to a 4-addr STA vlan yet send 1490 * the event to userspace and for older hostapd drop 1491 * the frame to the monitor interface. 1492 */ 1493 if (ieee80211_has_a4(hdr->frame_control) && 1494 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1495 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1496 !rx->sdata->u.vlan.sta))) { 1497 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1498 cfg80211_rx_unexpected_4addr_frame( 1499 rx->sdata->dev, sta->sta.addr, 1500 GFP_ATOMIC); 1501 return RX_DROP_MONITOR; 1502 } 1503 /* 1504 * Update counter and free packet here to avoid 1505 * counting this as a dropped packed. 1506 */ 1507 sta->rx_stats.packets++; 1508 dev_kfree_skb(rx->skb); 1509 return RX_QUEUED; 1510 } 1511 1512 return RX_CONTINUE; 1513 } /* ieee80211_rx_h_sta_process */ 1514 1515 static ieee80211_rx_result debug_noinline 1516 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 1517 { 1518 struct sk_buff *skb = rx->skb; 1519 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1520 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1521 int keyidx; 1522 int hdrlen; 1523 ieee80211_rx_result result = RX_DROP_UNUSABLE; 1524 struct ieee80211_key *sta_ptk = NULL; 1525 int mmie_keyidx = -1; 1526 __le16 fc; 1527 const struct ieee80211_cipher_scheme *cs = NULL; 1528 1529 /* 1530 * Key selection 101 1531 * 1532 * There are four types of keys: 1533 * - GTK (group keys) 1534 * - IGTK (group keys for management frames) 1535 * - PTK (pairwise keys) 1536 * - STK (station-to-station pairwise keys) 1537 * 1538 * When selecting a key, we have to distinguish between multicast 1539 * (including broadcast) and unicast frames, the latter can only 1540 * use PTKs and STKs while the former always use GTKs and IGTKs. 1541 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 1542 * unicast frames can also use key indices like GTKs. Hence, if we 1543 * don't have a PTK/STK we check the key index for a WEP key. 1544 * 1545 * Note that in a regular BSS, multicast frames are sent by the 1546 * AP only, associated stations unicast the frame to the AP first 1547 * which then multicasts it on their behalf. 1548 * 1549 * There is also a slight problem in IBSS mode: GTKs are negotiated 1550 * with each station, that is something we don't currently handle. 1551 * The spec seems to expect that one negotiates the same key with 1552 * every station but there's no such requirement; VLANs could be 1553 * possible. 1554 */ 1555 1556 /* start without a key */ 1557 rx->key = NULL; 1558 fc = hdr->frame_control; 1559 1560 if (rx->sta) { 1561 int keyid = rx->sta->ptk_idx; 1562 1563 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) { 1564 cs = rx->sta->cipher_scheme; 1565 keyid = iwl80211_get_cs_keyid(cs, rx->skb); 1566 if (unlikely(keyid < 0)) 1567 return RX_DROP_UNUSABLE; 1568 } 1569 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); 1570 } 1571 1572 if (!ieee80211_has_protected(fc)) 1573 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 1574 1575 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 1576 rx->key = sta_ptk; 1577 if ((status->flag & RX_FLAG_DECRYPTED) && 1578 (status->flag & RX_FLAG_IV_STRIPPED)) 1579 return RX_CONTINUE; 1580 /* Skip decryption if the frame is not protected. */ 1581 if (!ieee80211_has_protected(fc)) 1582 return RX_CONTINUE; 1583 } else if (mmie_keyidx >= 0) { 1584 /* Broadcast/multicast robust management frame / BIP */ 1585 if ((status->flag & RX_FLAG_DECRYPTED) && 1586 (status->flag & RX_FLAG_IV_STRIPPED)) 1587 return RX_CONTINUE; 1588 1589 if (mmie_keyidx < NUM_DEFAULT_KEYS || 1590 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 1591 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 1592 if (rx->sta) 1593 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 1594 if (!rx->key) 1595 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 1596 } else if (!ieee80211_has_protected(fc)) { 1597 /* 1598 * The frame was not protected, so skip decryption. However, we 1599 * need to set rx->key if there is a key that could have been 1600 * used so that the frame may be dropped if encryption would 1601 * have been expected. 1602 */ 1603 struct ieee80211_key *key = NULL; 1604 struct ieee80211_sub_if_data *sdata = rx->sdata; 1605 int i; 1606 1607 if (ieee80211_is_mgmt(fc) && 1608 is_multicast_ether_addr(hdr->addr1) && 1609 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 1610 rx->key = key; 1611 else { 1612 if (rx->sta) { 1613 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1614 key = rcu_dereference(rx->sta->gtk[i]); 1615 if (key) 1616 break; 1617 } 1618 } 1619 if (!key) { 1620 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1621 key = rcu_dereference(sdata->keys[i]); 1622 if (key) 1623 break; 1624 } 1625 } 1626 if (key) 1627 rx->key = key; 1628 } 1629 return RX_CONTINUE; 1630 } else { 1631 u8 keyid; 1632 1633 /* 1634 * The device doesn't give us the IV so we won't be 1635 * able to look up the key. That's ok though, we 1636 * don't need to decrypt the frame, we just won't 1637 * be able to keep statistics accurate. 1638 * Except for key threshold notifications, should 1639 * we somehow allow the driver to tell us which key 1640 * the hardware used if this flag is set? 1641 */ 1642 if ((status->flag & RX_FLAG_DECRYPTED) && 1643 (status->flag & RX_FLAG_IV_STRIPPED)) 1644 return RX_CONTINUE; 1645 1646 hdrlen = ieee80211_hdrlen(fc); 1647 1648 if (cs) { 1649 keyidx = iwl80211_get_cs_keyid(cs, rx->skb); 1650 1651 if (unlikely(keyidx < 0)) 1652 return RX_DROP_UNUSABLE; 1653 } else { 1654 if (rx->skb->len < 8 + hdrlen) 1655 return RX_DROP_UNUSABLE; /* TODO: count this? */ 1656 /* 1657 * no need to call ieee80211_wep_get_keyidx, 1658 * it verifies a bunch of things we've done already 1659 */ 1660 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 1661 keyidx = keyid >> 6; 1662 } 1663 1664 /* check per-station GTK first, if multicast packet */ 1665 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1666 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1667 1668 /* if not found, try default key */ 1669 if (!rx->key) { 1670 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1671 1672 /* 1673 * RSNA-protected unicast frames should always be 1674 * sent with pairwise or station-to-station keys, 1675 * but for WEP we allow using a key index as well. 1676 */ 1677 if (rx->key && 1678 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 1679 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 1680 !is_multicast_ether_addr(hdr->addr1)) 1681 rx->key = NULL; 1682 } 1683 } 1684 1685 if (rx->key) { 1686 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 1687 return RX_DROP_MONITOR; 1688 1689 /* TODO: add threshold stuff again */ 1690 } else { 1691 return RX_DROP_MONITOR; 1692 } 1693 1694 switch (rx->key->conf.cipher) { 1695 case WLAN_CIPHER_SUITE_WEP40: 1696 case WLAN_CIPHER_SUITE_WEP104: 1697 result = ieee80211_crypto_wep_decrypt(rx); 1698 break; 1699 case WLAN_CIPHER_SUITE_TKIP: 1700 result = ieee80211_crypto_tkip_decrypt(rx); 1701 break; 1702 case WLAN_CIPHER_SUITE_CCMP: 1703 result = ieee80211_crypto_ccmp_decrypt( 1704 rx, IEEE80211_CCMP_MIC_LEN); 1705 break; 1706 case WLAN_CIPHER_SUITE_CCMP_256: 1707 result = ieee80211_crypto_ccmp_decrypt( 1708 rx, IEEE80211_CCMP_256_MIC_LEN); 1709 break; 1710 case WLAN_CIPHER_SUITE_AES_CMAC: 1711 result = ieee80211_crypto_aes_cmac_decrypt(rx); 1712 break; 1713 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1714 result = ieee80211_crypto_aes_cmac_256_decrypt(rx); 1715 break; 1716 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1717 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1718 result = ieee80211_crypto_aes_gmac_decrypt(rx); 1719 break; 1720 case WLAN_CIPHER_SUITE_GCMP: 1721 case WLAN_CIPHER_SUITE_GCMP_256: 1722 result = ieee80211_crypto_gcmp_decrypt(rx); 1723 break; 1724 default: 1725 result = ieee80211_crypto_hw_decrypt(rx); 1726 } 1727 1728 /* the hdr variable is invalid after the decrypt handlers */ 1729 1730 /* either the frame has been decrypted or will be dropped */ 1731 status->flag |= RX_FLAG_DECRYPTED; 1732 1733 return result; 1734 } 1735 1736 static inline struct ieee80211_fragment_entry * 1737 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, 1738 unsigned int frag, unsigned int seq, int rx_queue, 1739 struct sk_buff **skb) 1740 { 1741 struct ieee80211_fragment_entry *entry; 1742 1743 entry = &sdata->fragments[sdata->fragment_next++]; 1744 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) 1745 sdata->fragment_next = 0; 1746 1747 if (!skb_queue_empty(&entry->skb_list)) 1748 __skb_queue_purge(&entry->skb_list); 1749 1750 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 1751 *skb = NULL; 1752 entry->first_frag_time = jiffies; 1753 entry->seq = seq; 1754 entry->rx_queue = rx_queue; 1755 entry->last_frag = frag; 1756 entry->ccmp = 0; 1757 entry->extra_len = 0; 1758 1759 return entry; 1760 } 1761 1762 static inline struct ieee80211_fragment_entry * 1763 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, 1764 unsigned int frag, unsigned int seq, 1765 int rx_queue, struct ieee80211_hdr *hdr) 1766 { 1767 struct ieee80211_fragment_entry *entry; 1768 int i, idx; 1769 1770 idx = sdata->fragment_next; 1771 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 1772 struct ieee80211_hdr *f_hdr; 1773 1774 idx--; 1775 if (idx < 0) 1776 idx = IEEE80211_FRAGMENT_MAX - 1; 1777 1778 entry = &sdata->fragments[idx]; 1779 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 1780 entry->rx_queue != rx_queue || 1781 entry->last_frag + 1 != frag) 1782 continue; 1783 1784 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; 1785 1786 /* 1787 * Check ftype and addresses are equal, else check next fragment 1788 */ 1789 if (((hdr->frame_control ^ f_hdr->frame_control) & 1790 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 1791 !ether_addr_equal(hdr->addr1, f_hdr->addr1) || 1792 !ether_addr_equal(hdr->addr2, f_hdr->addr2)) 1793 continue; 1794 1795 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 1796 __skb_queue_purge(&entry->skb_list); 1797 continue; 1798 } 1799 return entry; 1800 } 1801 1802 return NULL; 1803 } 1804 1805 static ieee80211_rx_result debug_noinline 1806 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 1807 { 1808 struct ieee80211_hdr *hdr; 1809 u16 sc; 1810 __le16 fc; 1811 unsigned int frag, seq; 1812 struct ieee80211_fragment_entry *entry; 1813 struct sk_buff *skb; 1814 struct ieee80211_rx_status *status; 1815 1816 hdr = (struct ieee80211_hdr *)rx->skb->data; 1817 fc = hdr->frame_control; 1818 1819 if (ieee80211_is_ctl(fc)) 1820 return RX_CONTINUE; 1821 1822 sc = le16_to_cpu(hdr->seq_ctrl); 1823 frag = sc & IEEE80211_SCTL_FRAG; 1824 1825 if (is_multicast_ether_addr(hdr->addr1)) { 1826 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount); 1827 goto out_no_led; 1828 } 1829 1830 if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) 1831 goto out; 1832 1833 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 1834 1835 if (skb_linearize(rx->skb)) 1836 return RX_DROP_UNUSABLE; 1837 1838 /* 1839 * skb_linearize() might change the skb->data and 1840 * previously cached variables (in this case, hdr) need to 1841 * be refreshed with the new data. 1842 */ 1843 hdr = (struct ieee80211_hdr *)rx->skb->data; 1844 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 1845 1846 if (frag == 0) { 1847 /* This is the first fragment of a new frame. */ 1848 entry = ieee80211_reassemble_add(rx->sdata, frag, seq, 1849 rx->seqno_idx, &(rx->skb)); 1850 if (rx->key && 1851 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || 1852 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) && 1853 ieee80211_has_protected(fc)) { 1854 int queue = rx->security_idx; 1855 /* Store CCMP PN so that we can verify that the next 1856 * fragment has a sequential PN value. */ 1857 entry->ccmp = 1; 1858 memcpy(entry->last_pn, 1859 rx->key->u.ccmp.rx_pn[queue], 1860 IEEE80211_CCMP_PN_LEN); 1861 } 1862 return RX_QUEUED; 1863 } 1864 1865 /* This is a fragment for a frame that should already be pending in 1866 * fragment cache. Add this fragment to the end of the pending entry. 1867 */ 1868 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, 1869 rx->seqno_idx, hdr); 1870 if (!entry) { 1871 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1872 return RX_DROP_MONITOR; 1873 } 1874 1875 /* Verify that MPDUs within one MSDU have sequential PN values. 1876 * (IEEE 802.11i, 8.3.3.4.5) */ 1877 if (entry->ccmp) { 1878 int i; 1879 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; 1880 int queue; 1881 if (!rx->key || 1882 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP && 1883 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256)) 1884 return RX_DROP_UNUSABLE; 1885 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); 1886 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { 1887 pn[i]++; 1888 if (pn[i]) 1889 break; 1890 } 1891 queue = rx->security_idx; 1892 rpn = rx->key->u.ccmp.rx_pn[queue]; 1893 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) 1894 return RX_DROP_UNUSABLE; 1895 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); 1896 } 1897 1898 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 1899 __skb_queue_tail(&entry->skb_list, rx->skb); 1900 entry->last_frag = frag; 1901 entry->extra_len += rx->skb->len; 1902 if (ieee80211_has_morefrags(fc)) { 1903 rx->skb = NULL; 1904 return RX_QUEUED; 1905 } 1906 1907 rx->skb = __skb_dequeue(&entry->skb_list); 1908 if (skb_tailroom(rx->skb) < entry->extra_len) { 1909 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); 1910 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 1911 GFP_ATOMIC))) { 1912 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1913 __skb_queue_purge(&entry->skb_list); 1914 return RX_DROP_UNUSABLE; 1915 } 1916 } 1917 while ((skb = __skb_dequeue(&entry->skb_list))) { 1918 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); 1919 dev_kfree_skb(skb); 1920 } 1921 1922 /* Complete frame has been reassembled - process it now */ 1923 status = IEEE80211_SKB_RXCB(rx->skb); 1924 1925 out: 1926 ieee80211_led_rx(rx->local); 1927 out_no_led: 1928 if (rx->sta) 1929 rx->sta->rx_stats.packets++; 1930 return RX_CONTINUE; 1931 } 1932 1933 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 1934 { 1935 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 1936 return -EACCES; 1937 1938 return 0; 1939 } 1940 1941 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 1942 { 1943 struct sk_buff *skb = rx->skb; 1944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1945 1946 /* 1947 * Pass through unencrypted frames if the hardware has 1948 * decrypted them already. 1949 */ 1950 if (status->flag & RX_FLAG_DECRYPTED) 1951 return 0; 1952 1953 /* Drop unencrypted frames if key is set. */ 1954 if (unlikely(!ieee80211_has_protected(fc) && 1955 !ieee80211_is_nullfunc(fc) && 1956 ieee80211_is_data(fc) && rx->key)) 1957 return -EACCES; 1958 1959 return 0; 1960 } 1961 1962 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 1963 { 1964 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1965 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1966 __le16 fc = hdr->frame_control; 1967 1968 /* 1969 * Pass through unencrypted frames if the hardware has 1970 * decrypted them already. 1971 */ 1972 if (status->flag & RX_FLAG_DECRYPTED) 1973 return 0; 1974 1975 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 1976 if (unlikely(!ieee80211_has_protected(fc) && 1977 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 1978 rx->key)) { 1979 if (ieee80211_is_deauth(fc) || 1980 ieee80211_is_disassoc(fc)) 1981 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1982 rx->skb->data, 1983 rx->skb->len); 1984 return -EACCES; 1985 } 1986 /* BIP does not use Protected field, so need to check MMIE */ 1987 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 1988 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 1989 if (ieee80211_is_deauth(fc) || 1990 ieee80211_is_disassoc(fc)) 1991 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, 1992 rx->skb->data, 1993 rx->skb->len); 1994 return -EACCES; 1995 } 1996 /* 1997 * When using MFP, Action frames are not allowed prior to 1998 * having configured keys. 1999 */ 2000 if (unlikely(ieee80211_is_action(fc) && !rx->key && 2001 ieee80211_is_robust_mgmt_frame(rx->skb))) 2002 return -EACCES; 2003 } 2004 2005 return 0; 2006 } 2007 2008 static int 2009 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 2010 { 2011 struct ieee80211_sub_if_data *sdata = rx->sdata; 2012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2013 bool check_port_control = false; 2014 struct ethhdr *ehdr; 2015 int ret; 2016 2017 *port_control = false; 2018 if (ieee80211_has_a4(hdr->frame_control) && 2019 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 2020 return -1; 2021 2022 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2023 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 2024 2025 if (!sdata->u.mgd.use_4addr) 2026 return -1; 2027 else 2028 check_port_control = true; 2029 } 2030 2031 if (is_multicast_ether_addr(hdr->addr1) && 2032 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 2033 return -1; 2034 2035 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 2036 if (ret < 0) 2037 return ret; 2038 2039 ehdr = (struct ethhdr *) rx->skb->data; 2040 if (ehdr->h_proto == rx->sdata->control_port_protocol) 2041 *port_control = true; 2042 else if (check_port_control) 2043 return -1; 2044 2045 return 0; 2046 } 2047 2048 /* 2049 * requires that rx->skb is a frame with ethernet header 2050 */ 2051 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 2052 { 2053 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 2054 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 2055 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2056 2057 /* 2058 * Allow EAPOL frames to us/the PAE group address regardless 2059 * of whether the frame was encrypted or not. 2060 */ 2061 if (ehdr->h_proto == rx->sdata->control_port_protocol && 2062 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || 2063 ether_addr_equal(ehdr->h_dest, pae_group_addr))) 2064 return true; 2065 2066 if (ieee80211_802_1x_port_control(rx) || 2067 ieee80211_drop_unencrypted(rx, fc)) 2068 return false; 2069 2070 return true; 2071 } 2072 2073 /* 2074 * requires that rx->skb is a frame with ethernet header 2075 */ 2076 static void 2077 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 2078 { 2079 struct ieee80211_sub_if_data *sdata = rx->sdata; 2080 struct net_device *dev = sdata->dev; 2081 struct sk_buff *skb, *xmit_skb; 2082 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 2083 struct sta_info *dsta; 2084 2085 skb = rx->skb; 2086 xmit_skb = NULL; 2087 2088 ieee80211_rx_stats(dev, skb->len); 2089 2090 if ((sdata->vif.type == NL80211_IFTYPE_AP || 2091 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 2092 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 2093 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 2094 if (is_multicast_ether_addr(ehdr->h_dest)) { 2095 /* 2096 * send multicast frames both to higher layers in 2097 * local net stack and back to the wireless medium 2098 */ 2099 xmit_skb = skb_copy(skb, GFP_ATOMIC); 2100 if (!xmit_skb) 2101 net_info_ratelimited("%s: failed to clone multicast frame\n", 2102 dev->name); 2103 } else { 2104 dsta = sta_info_get(sdata, skb->data); 2105 if (dsta) { 2106 /* 2107 * The destination station is associated to 2108 * this AP (in this VLAN), so send the frame 2109 * directly to it and do not pass it to local 2110 * net stack. 2111 */ 2112 xmit_skb = skb; 2113 skb = NULL; 2114 } 2115 } 2116 } 2117 2118 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2119 if (skb) { 2120 /* 'align' will only take the values 0 or 2 here since all 2121 * frames are required to be aligned to 2-byte boundaries 2122 * when being passed to mac80211; the code here works just 2123 * as well if that isn't true, but mac80211 assumes it can 2124 * access fields as 2-byte aligned (e.g. for ether_addr_equal) 2125 */ 2126 int align; 2127 2128 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; 2129 if (align) { 2130 if (WARN_ON(skb_headroom(skb) < 3)) { 2131 dev_kfree_skb(skb); 2132 skb = NULL; 2133 } else { 2134 u8 *data = skb->data; 2135 size_t len = skb_headlen(skb); 2136 skb->data -= align; 2137 memmove(skb->data, data, len); 2138 skb_set_tail_pointer(skb, len); 2139 } 2140 } 2141 } 2142 #endif 2143 2144 if (skb) { 2145 /* deliver to local stack */ 2146 skb->protocol = eth_type_trans(skb, dev); 2147 memset(skb->cb, 0, sizeof(skb->cb)); 2148 if (rx->napi) 2149 napi_gro_receive(rx->napi, skb); 2150 else 2151 netif_receive_skb(skb); 2152 } 2153 2154 if (xmit_skb) { 2155 /* 2156 * Send to wireless media and increase priority by 256 to 2157 * keep the received priority instead of reclassifying 2158 * the frame (see cfg80211_classify8021d). 2159 */ 2160 xmit_skb->priority += 256; 2161 xmit_skb->protocol = htons(ETH_P_802_3); 2162 skb_reset_network_header(xmit_skb); 2163 skb_reset_mac_header(xmit_skb); 2164 dev_queue_xmit(xmit_skb); 2165 } 2166 } 2167 2168 static ieee80211_rx_result debug_noinline 2169 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 2170 { 2171 struct net_device *dev = rx->sdata->dev; 2172 struct sk_buff *skb = rx->skb; 2173 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 2174 __le16 fc = hdr->frame_control; 2175 struct sk_buff_head frame_list; 2176 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2177 2178 if (unlikely(!ieee80211_is_data(fc))) 2179 return RX_CONTINUE; 2180 2181 if (unlikely(!ieee80211_is_data_present(fc))) 2182 return RX_DROP_MONITOR; 2183 2184 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 2185 return RX_CONTINUE; 2186 2187 if (ieee80211_has_a4(hdr->frame_control) && 2188 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2189 !rx->sdata->u.vlan.sta) 2190 return RX_DROP_UNUSABLE; 2191 2192 if (is_multicast_ether_addr(hdr->addr1) && 2193 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2194 rx->sdata->u.vlan.sta) || 2195 (rx->sdata->vif.type == NL80211_IFTYPE_STATION && 2196 rx->sdata->u.mgd.use_4addr))) 2197 return RX_DROP_UNUSABLE; 2198 2199 skb->dev = dev; 2200 __skb_queue_head_init(&frame_list); 2201 2202 if (skb_linearize(skb)) 2203 return RX_DROP_UNUSABLE; 2204 2205 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 2206 rx->sdata->vif.type, 2207 rx->local->hw.extra_tx_headroom, true); 2208 2209 while (!skb_queue_empty(&frame_list)) { 2210 rx->skb = __skb_dequeue(&frame_list); 2211 2212 if (!ieee80211_frame_allowed(rx, fc)) { 2213 dev_kfree_skb(rx->skb); 2214 continue; 2215 } 2216 2217 ieee80211_deliver_skb(rx); 2218 } 2219 2220 return RX_QUEUED; 2221 } 2222 2223 #ifdef CONFIG_MAC80211_MESH 2224 static ieee80211_rx_result 2225 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 2226 { 2227 struct ieee80211_hdr *fwd_hdr, *hdr; 2228 struct ieee80211_tx_info *info; 2229 struct ieee80211s_hdr *mesh_hdr; 2230 struct sk_buff *skb = rx->skb, *fwd_skb; 2231 struct ieee80211_local *local = rx->local; 2232 struct ieee80211_sub_if_data *sdata = rx->sdata; 2233 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2234 u16 q, hdrlen; 2235 2236 hdr = (struct ieee80211_hdr *) skb->data; 2237 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2238 2239 /* make sure fixed part of mesh header is there, also checks skb len */ 2240 if (!pskb_may_pull(rx->skb, hdrlen + 6)) 2241 return RX_DROP_MONITOR; 2242 2243 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2244 2245 /* make sure full mesh header is there, also checks skb len */ 2246 if (!pskb_may_pull(rx->skb, 2247 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) 2248 return RX_DROP_MONITOR; 2249 2250 /* reload pointers */ 2251 hdr = (struct ieee80211_hdr *) skb->data; 2252 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 2253 2254 if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) 2255 return RX_DROP_MONITOR; 2256 2257 /* frame is in RMC, don't forward */ 2258 if (ieee80211_is_data(hdr->frame_control) && 2259 is_multicast_ether_addr(hdr->addr1) && 2260 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) 2261 return RX_DROP_MONITOR; 2262 2263 if (!ieee80211_is_data(hdr->frame_control)) 2264 return RX_CONTINUE; 2265 2266 if (!mesh_hdr->ttl) 2267 return RX_DROP_MONITOR; 2268 2269 if (mesh_hdr->flags & MESH_FLAGS_AE) { 2270 struct mesh_path *mppath; 2271 char *proxied_addr; 2272 char *mpp_addr; 2273 2274 if (is_multicast_ether_addr(hdr->addr1)) { 2275 mpp_addr = hdr->addr3; 2276 proxied_addr = mesh_hdr->eaddr1; 2277 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) { 2278 /* has_a4 already checked in ieee80211_rx_mesh_check */ 2279 mpp_addr = hdr->addr4; 2280 proxied_addr = mesh_hdr->eaddr2; 2281 } else { 2282 return RX_DROP_MONITOR; 2283 } 2284 2285 rcu_read_lock(); 2286 mppath = mpp_path_lookup(sdata, proxied_addr); 2287 if (!mppath) { 2288 mpp_path_add(sdata, proxied_addr, mpp_addr); 2289 } else { 2290 spin_lock_bh(&mppath->state_lock); 2291 if (!ether_addr_equal(mppath->mpp, mpp_addr)) 2292 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 2293 spin_unlock_bh(&mppath->state_lock); 2294 } 2295 rcu_read_unlock(); 2296 } 2297 2298 /* Frame has reached destination. Don't forward */ 2299 if (!is_multicast_ether_addr(hdr->addr1) && 2300 ether_addr_equal(sdata->vif.addr, hdr->addr3)) 2301 return RX_CONTINUE; 2302 2303 q = ieee80211_select_queue_80211(sdata, skb, hdr); 2304 if (ieee80211_queue_stopped(&local->hw, q)) { 2305 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 2306 return RX_DROP_MONITOR; 2307 } 2308 skb_set_queue_mapping(skb, q); 2309 2310 if (!--mesh_hdr->ttl) { 2311 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 2312 goto out; 2313 } 2314 2315 if (!ifmsh->mshcfg.dot11MeshForwarding) 2316 goto out; 2317 2318 fwd_skb = skb_copy(skb, GFP_ATOMIC); 2319 if (!fwd_skb) { 2320 net_info_ratelimited("%s: failed to clone mesh frame\n", 2321 sdata->name); 2322 goto out; 2323 } 2324 2325 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 2326 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); 2327 info = IEEE80211_SKB_CB(fwd_skb); 2328 memset(info, 0, sizeof(*info)); 2329 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 2330 info->control.vif = &rx->sdata->vif; 2331 info->control.jiffies = jiffies; 2332 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 2333 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 2334 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 2335 /* update power mode indication when forwarding */ 2336 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); 2337 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { 2338 /* mesh power mode flags updated in mesh_nexthop_lookup */ 2339 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 2340 } else { 2341 /* unable to resolve next hop */ 2342 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, 2343 fwd_hdr->addr3, 0, 2344 WLAN_REASON_MESH_PATH_NOFORWARD, 2345 fwd_hdr->addr2); 2346 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 2347 kfree_skb(fwd_skb); 2348 return RX_DROP_MONITOR; 2349 } 2350 2351 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 2352 ieee80211_add_pending_skb(local, fwd_skb); 2353 out: 2354 if (is_multicast_ether_addr(hdr->addr1)) 2355 return RX_CONTINUE; 2356 return RX_DROP_MONITOR; 2357 } 2358 #endif 2359 2360 static ieee80211_rx_result debug_noinline 2361 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 2362 { 2363 struct ieee80211_sub_if_data *sdata = rx->sdata; 2364 struct ieee80211_local *local = rx->local; 2365 struct net_device *dev = sdata->dev; 2366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2367 __le16 fc = hdr->frame_control; 2368 bool port_control; 2369 int err; 2370 2371 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 2372 return RX_CONTINUE; 2373 2374 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 2375 return RX_DROP_MONITOR; 2376 2377 if (rx->sta) { 2378 /* The seqno index has the same property as needed 2379 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS 2380 * for non-QoS-data frames. Here we know it's a data 2381 * frame, so count MSDUs. 2382 */ 2383 rx->sta->rx_stats.msdu[rx->seqno_idx]++; 2384 } 2385 2386 /* 2387 * Send unexpected-4addr-frame event to hostapd. For older versions, 2388 * also drop the frame to cooked monitor interfaces. 2389 */ 2390 if (ieee80211_has_a4(hdr->frame_control) && 2391 sdata->vif.type == NL80211_IFTYPE_AP) { 2392 if (rx->sta && 2393 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 2394 cfg80211_rx_unexpected_4addr_frame( 2395 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 2396 return RX_DROP_MONITOR; 2397 } 2398 2399 err = __ieee80211_data_to_8023(rx, &port_control); 2400 if (unlikely(err)) 2401 return RX_DROP_UNUSABLE; 2402 2403 if (!ieee80211_frame_allowed(rx, fc)) 2404 return RX_DROP_MONITOR; 2405 2406 /* directly handle TDLS channel switch requests/responses */ 2407 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == 2408 cpu_to_be16(ETH_P_TDLS))) { 2409 struct ieee80211_tdls_data *tf = (void *)rx->skb->data; 2410 2411 if (pskb_may_pull(rx->skb, 2412 offsetof(struct ieee80211_tdls_data, u)) && 2413 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && 2414 tf->category == WLAN_CATEGORY_TDLS && 2415 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || 2416 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { 2417 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb); 2418 schedule_work(&local->tdls_chsw_work); 2419 if (rx->sta) 2420 rx->sta->rx_stats.packets++; 2421 2422 return RX_QUEUED; 2423 } 2424 } 2425 2426 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2427 unlikely(port_control) && sdata->bss) { 2428 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2429 u.ap); 2430 dev = sdata->dev; 2431 rx->sdata = sdata; 2432 } 2433 2434 rx->skb->dev = dev; 2435 2436 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 2437 !is_multicast_ether_addr( 2438 ((struct ethhdr *)rx->skb->data)->h_dest) && 2439 (!local->scanning && 2440 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { 2441 mod_timer(&local->dynamic_ps_timer, jiffies + 2442 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 2443 } 2444 2445 ieee80211_deliver_skb(rx); 2446 2447 return RX_QUEUED; 2448 } 2449 2450 static ieee80211_rx_result debug_noinline 2451 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) 2452 { 2453 struct sk_buff *skb = rx->skb; 2454 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 2455 struct tid_ampdu_rx *tid_agg_rx; 2456 u16 start_seq_num; 2457 u16 tid; 2458 2459 if (likely(!ieee80211_is_ctl(bar->frame_control))) 2460 return RX_CONTINUE; 2461 2462 if (ieee80211_is_back_req(bar->frame_control)) { 2463 struct { 2464 __le16 control, start_seq_num; 2465 } __packed bar_data; 2466 struct ieee80211_event event = { 2467 .type = BAR_RX_EVENT, 2468 }; 2469 2470 if (!rx->sta) 2471 return RX_DROP_MONITOR; 2472 2473 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 2474 &bar_data, sizeof(bar_data))) 2475 return RX_DROP_MONITOR; 2476 2477 tid = le16_to_cpu(bar_data.control) >> 12; 2478 2479 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 2480 if (!tid_agg_rx) 2481 return RX_DROP_MONITOR; 2482 2483 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 2484 event.u.ba.tid = tid; 2485 event.u.ba.ssn = start_seq_num; 2486 event.u.ba.sta = &rx->sta->sta; 2487 2488 /* reset session timer */ 2489 if (tid_agg_rx->timeout) 2490 mod_timer(&tid_agg_rx->session_timer, 2491 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 2492 2493 spin_lock(&tid_agg_rx->reorder_lock); 2494 /* release stored frames up to start of BAR */ 2495 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, 2496 start_seq_num, frames); 2497 spin_unlock(&tid_agg_rx->reorder_lock); 2498 2499 drv_event_callback(rx->local, rx->sdata, &event); 2500 2501 kfree_skb(skb); 2502 return RX_QUEUED; 2503 } 2504 2505 /* 2506 * After this point, we only want management frames, 2507 * so we can drop all remaining control frames to 2508 * cooked monitor interfaces. 2509 */ 2510 return RX_DROP_MONITOR; 2511 } 2512 2513 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 2514 struct ieee80211_mgmt *mgmt, 2515 size_t len) 2516 { 2517 struct ieee80211_local *local = sdata->local; 2518 struct sk_buff *skb; 2519 struct ieee80211_mgmt *resp; 2520 2521 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { 2522 /* Not to own unicast address */ 2523 return; 2524 } 2525 2526 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || 2527 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { 2528 /* Not from the current AP or not associated yet. */ 2529 return; 2530 } 2531 2532 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 2533 /* Too short SA Query request frame */ 2534 return; 2535 } 2536 2537 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 2538 if (skb == NULL) 2539 return; 2540 2541 skb_reserve(skb, local->hw.extra_tx_headroom); 2542 resp = (struct ieee80211_mgmt *) skb_put(skb, 24); 2543 memset(resp, 0, 24); 2544 memcpy(resp->da, mgmt->sa, ETH_ALEN); 2545 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 2546 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 2547 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2548 IEEE80211_STYPE_ACTION); 2549 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 2550 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 2551 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 2552 memcpy(resp->u.action.u.sa_query.trans_id, 2553 mgmt->u.action.u.sa_query.trans_id, 2554 WLAN_SA_QUERY_TR_ID_LEN); 2555 2556 ieee80211_tx_skb(sdata, skb); 2557 } 2558 2559 static ieee80211_rx_result debug_noinline 2560 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 2561 { 2562 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2563 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2564 2565 /* 2566 * From here on, look only at management frames. 2567 * Data and control frames are already handled, 2568 * and unknown (reserved) frames are useless. 2569 */ 2570 if (rx->skb->len < 24) 2571 return RX_DROP_MONITOR; 2572 2573 if (!ieee80211_is_mgmt(mgmt->frame_control)) 2574 return RX_DROP_MONITOR; 2575 2576 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 2577 ieee80211_is_beacon(mgmt->frame_control) && 2578 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 2579 int sig = 0; 2580 2581 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM)) 2582 sig = status->signal; 2583 2584 cfg80211_report_obss_beacon(rx->local->hw.wiphy, 2585 rx->skb->data, rx->skb->len, 2586 status->freq, sig); 2587 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 2588 } 2589 2590 if (ieee80211_drop_unencrypted_mgmt(rx)) 2591 return RX_DROP_UNUSABLE; 2592 2593 return RX_CONTINUE; 2594 } 2595 2596 static ieee80211_rx_result debug_noinline 2597 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 2598 { 2599 struct ieee80211_local *local = rx->local; 2600 struct ieee80211_sub_if_data *sdata = rx->sdata; 2601 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2602 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2603 int len = rx->skb->len; 2604 2605 if (!ieee80211_is_action(mgmt->frame_control)) 2606 return RX_CONTINUE; 2607 2608 /* drop too small frames */ 2609 if (len < IEEE80211_MIN_ACTION_SIZE) 2610 return RX_DROP_UNUSABLE; 2611 2612 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && 2613 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && 2614 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) 2615 return RX_DROP_UNUSABLE; 2616 2617 switch (mgmt->u.action.category) { 2618 case WLAN_CATEGORY_HT: 2619 /* reject HT action frames from stations not supporting HT */ 2620 if (!rx->sta->sta.ht_cap.ht_supported) 2621 goto invalid; 2622 2623 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2624 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2625 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2626 sdata->vif.type != NL80211_IFTYPE_AP && 2627 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2628 break; 2629 2630 /* verify action & smps_control/chanwidth are present */ 2631 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 2632 goto invalid; 2633 2634 switch (mgmt->u.action.u.ht_smps.action) { 2635 case WLAN_HT_ACTION_SMPS: { 2636 struct ieee80211_supported_band *sband; 2637 enum ieee80211_smps_mode smps_mode; 2638 2639 /* convert to HT capability */ 2640 switch (mgmt->u.action.u.ht_smps.smps_control) { 2641 case WLAN_HT_SMPS_CONTROL_DISABLED: 2642 smps_mode = IEEE80211_SMPS_OFF; 2643 break; 2644 case WLAN_HT_SMPS_CONTROL_STATIC: 2645 smps_mode = IEEE80211_SMPS_STATIC; 2646 break; 2647 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 2648 smps_mode = IEEE80211_SMPS_DYNAMIC; 2649 break; 2650 default: 2651 goto invalid; 2652 } 2653 2654 /* if no change do nothing */ 2655 if (rx->sta->sta.smps_mode == smps_mode) 2656 goto handled; 2657 rx->sta->sta.smps_mode = smps_mode; 2658 2659 sband = rx->local->hw.wiphy->bands[status->band]; 2660 2661 rate_control_rate_update(local, sband, rx->sta, 2662 IEEE80211_RC_SMPS_CHANGED); 2663 goto handled; 2664 } 2665 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 2666 struct ieee80211_supported_band *sband; 2667 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 2668 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 2669 2670 /* If it doesn't support 40 MHz it can't change ... */ 2671 if (!(rx->sta->sta.ht_cap.cap & 2672 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 2673 goto handled; 2674 2675 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 2676 max_bw = IEEE80211_STA_RX_BW_20; 2677 else 2678 max_bw = ieee80211_sta_cap_rx_bw(rx->sta); 2679 2680 /* set cur_max_bandwidth and recalc sta bw */ 2681 rx->sta->cur_max_bandwidth = max_bw; 2682 new_bw = ieee80211_sta_cur_vht_bw(rx->sta); 2683 2684 if (rx->sta->sta.bandwidth == new_bw) 2685 goto handled; 2686 2687 rx->sta->sta.bandwidth = new_bw; 2688 sband = rx->local->hw.wiphy->bands[status->band]; 2689 2690 rate_control_rate_update(local, sband, rx->sta, 2691 IEEE80211_RC_BW_CHANGED); 2692 goto handled; 2693 } 2694 default: 2695 goto invalid; 2696 } 2697 2698 break; 2699 case WLAN_CATEGORY_PUBLIC: 2700 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2701 goto invalid; 2702 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2703 break; 2704 if (!rx->sta) 2705 break; 2706 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) 2707 break; 2708 if (mgmt->u.action.u.ext_chan_switch.action_code != 2709 WLAN_PUB_ACTION_EXT_CHANSW_ANN) 2710 break; 2711 if (len < offsetof(struct ieee80211_mgmt, 2712 u.action.u.ext_chan_switch.variable)) 2713 goto invalid; 2714 goto queue; 2715 case WLAN_CATEGORY_VHT: 2716 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2717 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2718 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2719 sdata->vif.type != NL80211_IFTYPE_AP && 2720 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2721 break; 2722 2723 /* verify action code is present */ 2724 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2725 goto invalid; 2726 2727 switch (mgmt->u.action.u.vht_opmode_notif.action_code) { 2728 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 2729 u8 opmode; 2730 2731 /* verify opmode is present */ 2732 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 2733 goto invalid; 2734 2735 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 2736 2737 ieee80211_vht_handle_opmode(rx->sdata, rx->sta, 2738 opmode, status->band); 2739 goto handled; 2740 } 2741 default: 2742 break; 2743 } 2744 break; 2745 case WLAN_CATEGORY_BACK: 2746 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2747 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2748 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2749 sdata->vif.type != NL80211_IFTYPE_AP && 2750 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2751 break; 2752 2753 /* verify action_code is present */ 2754 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2755 break; 2756 2757 switch (mgmt->u.action.u.addba_req.action_code) { 2758 case WLAN_ACTION_ADDBA_REQ: 2759 if (len < (IEEE80211_MIN_ACTION_SIZE + 2760 sizeof(mgmt->u.action.u.addba_req))) 2761 goto invalid; 2762 break; 2763 case WLAN_ACTION_ADDBA_RESP: 2764 if (len < (IEEE80211_MIN_ACTION_SIZE + 2765 sizeof(mgmt->u.action.u.addba_resp))) 2766 goto invalid; 2767 break; 2768 case WLAN_ACTION_DELBA: 2769 if (len < (IEEE80211_MIN_ACTION_SIZE + 2770 sizeof(mgmt->u.action.u.delba))) 2771 goto invalid; 2772 break; 2773 default: 2774 goto invalid; 2775 } 2776 2777 goto queue; 2778 case WLAN_CATEGORY_SPECTRUM_MGMT: 2779 /* verify action_code is present */ 2780 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2781 break; 2782 2783 switch (mgmt->u.action.u.measurement.action_code) { 2784 case WLAN_ACTION_SPCT_MSR_REQ: 2785 if (status->band != IEEE80211_BAND_5GHZ) 2786 break; 2787 2788 if (len < (IEEE80211_MIN_ACTION_SIZE + 2789 sizeof(mgmt->u.action.u.measurement))) 2790 break; 2791 2792 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2793 break; 2794 2795 ieee80211_process_measurement_req(sdata, mgmt, len); 2796 goto handled; 2797 case WLAN_ACTION_SPCT_CHL_SWITCH: { 2798 u8 *bssid; 2799 if (len < (IEEE80211_MIN_ACTION_SIZE + 2800 sizeof(mgmt->u.action.u.chan_switch))) 2801 break; 2802 2803 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2804 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2805 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 2806 break; 2807 2808 if (sdata->vif.type == NL80211_IFTYPE_STATION) 2809 bssid = sdata->u.mgd.bssid; 2810 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 2811 bssid = sdata->u.ibss.bssid; 2812 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 2813 bssid = mgmt->sa; 2814 else 2815 break; 2816 2817 if (!ether_addr_equal(mgmt->bssid, bssid)) 2818 break; 2819 2820 goto queue; 2821 } 2822 } 2823 break; 2824 case WLAN_CATEGORY_SA_QUERY: 2825 if (len < (IEEE80211_MIN_ACTION_SIZE + 2826 sizeof(mgmt->u.action.u.sa_query))) 2827 break; 2828 2829 switch (mgmt->u.action.u.sa_query.action) { 2830 case WLAN_ACTION_SA_QUERY_REQUEST: 2831 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2832 break; 2833 ieee80211_process_sa_query_req(sdata, mgmt, len); 2834 goto handled; 2835 } 2836 break; 2837 case WLAN_CATEGORY_SELF_PROTECTED: 2838 if (len < (IEEE80211_MIN_ACTION_SIZE + 2839 sizeof(mgmt->u.action.u.self_prot.action_code))) 2840 break; 2841 2842 switch (mgmt->u.action.u.self_prot.action_code) { 2843 case WLAN_SP_MESH_PEERING_OPEN: 2844 case WLAN_SP_MESH_PEERING_CLOSE: 2845 case WLAN_SP_MESH_PEERING_CONFIRM: 2846 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2847 goto invalid; 2848 if (sdata->u.mesh.user_mpm) 2849 /* userspace handles this frame */ 2850 break; 2851 goto queue; 2852 case WLAN_SP_MGK_INFORM: 2853 case WLAN_SP_MGK_ACK: 2854 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2855 goto invalid; 2856 break; 2857 } 2858 break; 2859 case WLAN_CATEGORY_MESH_ACTION: 2860 if (len < (IEEE80211_MIN_ACTION_SIZE + 2861 sizeof(mgmt->u.action.u.mesh_action.action_code))) 2862 break; 2863 2864 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2865 break; 2866 if (mesh_action_is_path_sel(mgmt) && 2867 !mesh_path_sel_is_hwmp(sdata)) 2868 break; 2869 goto queue; 2870 } 2871 2872 return RX_CONTINUE; 2873 2874 invalid: 2875 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 2876 /* will return in the next handlers */ 2877 return RX_CONTINUE; 2878 2879 handled: 2880 if (rx->sta) 2881 rx->sta->rx_stats.packets++; 2882 dev_kfree_skb(rx->skb); 2883 return RX_QUEUED; 2884 2885 queue: 2886 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2887 skb_queue_tail(&sdata->skb_queue, rx->skb); 2888 ieee80211_queue_work(&local->hw, &sdata->work); 2889 if (rx->sta) 2890 rx->sta->rx_stats.packets++; 2891 return RX_QUEUED; 2892 } 2893 2894 static ieee80211_rx_result debug_noinline 2895 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 2896 { 2897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2898 int sig = 0; 2899 2900 /* skip known-bad action frames and return them in the next handler */ 2901 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 2902 return RX_CONTINUE; 2903 2904 /* 2905 * Getting here means the kernel doesn't know how to handle 2906 * it, but maybe userspace does ... include returned frames 2907 * so userspace can register for those to know whether ones 2908 * it transmitted were processed or returned. 2909 */ 2910 2911 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM)) 2912 sig = status->signal; 2913 2914 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig, 2915 rx->skb->data, rx->skb->len, 0)) { 2916 if (rx->sta) 2917 rx->sta->rx_stats.packets++; 2918 dev_kfree_skb(rx->skb); 2919 return RX_QUEUED; 2920 } 2921 2922 return RX_CONTINUE; 2923 } 2924 2925 static ieee80211_rx_result debug_noinline 2926 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 2927 { 2928 struct ieee80211_local *local = rx->local; 2929 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2930 struct sk_buff *nskb; 2931 struct ieee80211_sub_if_data *sdata = rx->sdata; 2932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2933 2934 if (!ieee80211_is_action(mgmt->frame_control)) 2935 return RX_CONTINUE; 2936 2937 /* 2938 * For AP mode, hostapd is responsible for handling any action 2939 * frames that we didn't handle, including returning unknown 2940 * ones. For all other modes we will return them to the sender, 2941 * setting the 0x80 bit in the action category, as required by 2942 * 802.11-2012 9.24.4. 2943 * Newer versions of hostapd shall also use the management frame 2944 * registration mechanisms, but older ones still use cooked 2945 * monitor interfaces so push all frames there. 2946 */ 2947 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 2948 (sdata->vif.type == NL80211_IFTYPE_AP || 2949 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 2950 return RX_DROP_MONITOR; 2951 2952 if (is_multicast_ether_addr(mgmt->da)) 2953 return RX_DROP_MONITOR; 2954 2955 /* do not return rejected action frames */ 2956 if (mgmt->u.action.category & 0x80) 2957 return RX_DROP_UNUSABLE; 2958 2959 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 2960 GFP_ATOMIC); 2961 if (nskb) { 2962 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 2963 2964 nmgmt->u.action.category |= 0x80; 2965 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 2966 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 2967 2968 memset(nskb->cb, 0, sizeof(nskb->cb)); 2969 2970 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 2971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); 2972 2973 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | 2974 IEEE80211_TX_INTFL_OFFCHAN_TX_OK | 2975 IEEE80211_TX_CTL_NO_CCK_RATE; 2976 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 2977 info->hw_queue = 2978 local->hw.offchannel_tx_hw_queue; 2979 } 2980 2981 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, 2982 status->band); 2983 } 2984 dev_kfree_skb(rx->skb); 2985 return RX_QUEUED; 2986 } 2987 2988 static ieee80211_rx_result debug_noinline 2989 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 2990 { 2991 struct ieee80211_sub_if_data *sdata = rx->sdata; 2992 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2993 __le16 stype; 2994 2995 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 2996 2997 if (!ieee80211_vif_is_mesh(&sdata->vif) && 2998 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2999 sdata->vif.type != NL80211_IFTYPE_OCB && 3000 sdata->vif.type != NL80211_IFTYPE_STATION) 3001 return RX_DROP_MONITOR; 3002 3003 switch (stype) { 3004 case cpu_to_le16(IEEE80211_STYPE_AUTH): 3005 case cpu_to_le16(IEEE80211_STYPE_BEACON): 3006 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 3007 /* process for all: mesh, mlme, ibss */ 3008 break; 3009 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): 3010 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): 3011 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 3012 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 3013 if (is_multicast_ether_addr(mgmt->da) && 3014 !is_broadcast_ether_addr(mgmt->da)) 3015 return RX_DROP_MONITOR; 3016 3017 /* process only for station */ 3018 if (sdata->vif.type != NL80211_IFTYPE_STATION) 3019 return RX_DROP_MONITOR; 3020 break; 3021 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 3022 /* process only for ibss and mesh */ 3023 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 3024 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 3025 return RX_DROP_MONITOR; 3026 break; 3027 default: 3028 return RX_DROP_MONITOR; 3029 } 3030 3031 /* queue up frame and kick off work to process it */ 3032 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 3033 skb_queue_tail(&sdata->skb_queue, rx->skb); 3034 ieee80211_queue_work(&rx->local->hw, &sdata->work); 3035 if (rx->sta) 3036 rx->sta->rx_stats.packets++; 3037 3038 return RX_QUEUED; 3039 } 3040 3041 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 3042 struct ieee80211_rate *rate) 3043 { 3044 struct ieee80211_sub_if_data *sdata; 3045 struct ieee80211_local *local = rx->local; 3046 struct sk_buff *skb = rx->skb, *skb2; 3047 struct net_device *prev_dev = NULL; 3048 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3049 int needed_headroom; 3050 3051 /* 3052 * If cooked monitor has been processed already, then 3053 * don't do it again. If not, set the flag. 3054 */ 3055 if (rx->flags & IEEE80211_RX_CMNTR) 3056 goto out_free_skb; 3057 rx->flags |= IEEE80211_RX_CMNTR; 3058 3059 /* If there are no cooked monitor interfaces, just free the SKB */ 3060 if (!local->cooked_mntrs) 3061 goto out_free_skb; 3062 3063 /* vendor data is long removed here */ 3064 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA; 3065 /* room for the radiotap header based on driver features */ 3066 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb); 3067 3068 if (skb_headroom(skb) < needed_headroom && 3069 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) 3070 goto out_free_skb; 3071 3072 /* prepend radiotap information */ 3073 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, 3074 false); 3075 3076 skb_set_mac_header(skb, 0); 3077 skb->ip_summed = CHECKSUM_UNNECESSARY; 3078 skb->pkt_type = PACKET_OTHERHOST; 3079 skb->protocol = htons(ETH_P_802_2); 3080 3081 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3082 if (!ieee80211_sdata_running(sdata)) 3083 continue; 3084 3085 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 3086 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) 3087 continue; 3088 3089 if (prev_dev) { 3090 skb2 = skb_clone(skb, GFP_ATOMIC); 3091 if (skb2) { 3092 skb2->dev = prev_dev; 3093 netif_receive_skb(skb2); 3094 } 3095 } 3096 3097 prev_dev = sdata->dev; 3098 ieee80211_rx_stats(sdata->dev, skb->len); 3099 } 3100 3101 if (prev_dev) { 3102 skb->dev = prev_dev; 3103 netif_receive_skb(skb); 3104 return; 3105 } 3106 3107 out_free_skb: 3108 dev_kfree_skb(skb); 3109 } 3110 3111 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 3112 ieee80211_rx_result res) 3113 { 3114 switch (res) { 3115 case RX_DROP_MONITOR: 3116 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3117 if (rx->sta) 3118 rx->sta->rx_stats.dropped++; 3119 /* fall through */ 3120 case RX_CONTINUE: { 3121 struct ieee80211_rate *rate = NULL; 3122 struct ieee80211_supported_band *sband; 3123 struct ieee80211_rx_status *status; 3124 3125 status = IEEE80211_SKB_RXCB((rx->skb)); 3126 3127 sband = rx->local->hw.wiphy->bands[status->band]; 3128 if (!(status->flag & RX_FLAG_HT) && 3129 !(status->flag & RX_FLAG_VHT)) 3130 rate = &sband->bitrates[status->rate_idx]; 3131 3132 ieee80211_rx_cooked_monitor(rx, rate); 3133 break; 3134 } 3135 case RX_DROP_UNUSABLE: 3136 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 3137 if (rx->sta) 3138 rx->sta->rx_stats.dropped++; 3139 dev_kfree_skb(rx->skb); 3140 break; 3141 case RX_QUEUED: 3142 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 3143 break; 3144 } 3145 } 3146 3147 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, 3148 struct sk_buff_head *frames) 3149 { 3150 ieee80211_rx_result res = RX_DROP_MONITOR; 3151 struct sk_buff *skb; 3152 3153 #define CALL_RXH(rxh) \ 3154 do { \ 3155 res = rxh(rx); \ 3156 if (res != RX_CONTINUE) \ 3157 goto rxh_next; \ 3158 } while (0); 3159 3160 /* Lock here to avoid hitting all of the data used in the RX 3161 * path (e.g. key data, station data, ...) concurrently when 3162 * a frame is released from the reorder buffer due to timeout 3163 * from the timer, potentially concurrently with RX from the 3164 * driver. 3165 */ 3166 spin_lock_bh(&rx->local->rx_path_lock); 3167 3168 while ((skb = __skb_dequeue(frames))) { 3169 /* 3170 * all the other fields are valid across frames 3171 * that belong to an aMPDU since they are on the 3172 * same TID from the same station 3173 */ 3174 rx->skb = skb; 3175 3176 CALL_RXH(ieee80211_rx_h_check_more_data) 3177 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) 3178 CALL_RXH(ieee80211_rx_h_sta_process) 3179 CALL_RXH(ieee80211_rx_h_decrypt) 3180 CALL_RXH(ieee80211_rx_h_defragment) 3181 CALL_RXH(ieee80211_rx_h_michael_mic_verify) 3182 /* must be after MMIC verify so header is counted in MPDU mic */ 3183 #ifdef CONFIG_MAC80211_MESH 3184 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 3185 CALL_RXH(ieee80211_rx_h_mesh_fwding); 3186 #endif 3187 CALL_RXH(ieee80211_rx_h_amsdu) 3188 CALL_RXH(ieee80211_rx_h_data) 3189 3190 /* special treatment -- needs the queue */ 3191 res = ieee80211_rx_h_ctrl(rx, frames); 3192 if (res != RX_CONTINUE) 3193 goto rxh_next; 3194 3195 CALL_RXH(ieee80211_rx_h_mgmt_check) 3196 CALL_RXH(ieee80211_rx_h_action) 3197 CALL_RXH(ieee80211_rx_h_userspace_mgmt) 3198 CALL_RXH(ieee80211_rx_h_action_return) 3199 CALL_RXH(ieee80211_rx_h_mgmt) 3200 3201 rxh_next: 3202 ieee80211_rx_handlers_result(rx, res); 3203 3204 #undef CALL_RXH 3205 } 3206 3207 spin_unlock_bh(&rx->local->rx_path_lock); 3208 } 3209 3210 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 3211 { 3212 struct sk_buff_head reorder_release; 3213 ieee80211_rx_result res = RX_DROP_MONITOR; 3214 3215 __skb_queue_head_init(&reorder_release); 3216 3217 #define CALL_RXH(rxh) \ 3218 do { \ 3219 res = rxh(rx); \ 3220 if (res != RX_CONTINUE) \ 3221 goto rxh_next; \ 3222 } while (0); 3223 3224 CALL_RXH(ieee80211_rx_h_check_dup) 3225 CALL_RXH(ieee80211_rx_h_check) 3226 3227 ieee80211_rx_reorder_ampdu(rx, &reorder_release); 3228 3229 ieee80211_rx_handlers(rx, &reorder_release); 3230 return; 3231 3232 rxh_next: 3233 ieee80211_rx_handlers_result(rx, res); 3234 3235 #undef CALL_RXH 3236 } 3237 3238 /* 3239 * This function makes calls into the RX path, therefore 3240 * it has to be invoked under RCU read lock. 3241 */ 3242 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 3243 { 3244 struct sk_buff_head frames; 3245 struct ieee80211_rx_data rx = { 3246 .sta = sta, 3247 .sdata = sta->sdata, 3248 .local = sta->local, 3249 /* This is OK -- must be QoS data frame */ 3250 .security_idx = tid, 3251 .seqno_idx = tid, 3252 .napi = NULL, /* must be NULL to not have races */ 3253 }; 3254 struct tid_ampdu_rx *tid_agg_rx; 3255 3256 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 3257 if (!tid_agg_rx) 3258 return; 3259 3260 __skb_queue_head_init(&frames); 3261 3262 spin_lock(&tid_agg_rx->reorder_lock); 3263 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); 3264 spin_unlock(&tid_agg_rx->reorder_lock); 3265 3266 if (!skb_queue_empty(&frames)) { 3267 struct ieee80211_event event = { 3268 .type = BA_FRAME_TIMEOUT, 3269 .u.ba.tid = tid, 3270 .u.ba.sta = &sta->sta, 3271 }; 3272 drv_event_callback(rx.local, rx.sdata, &event); 3273 } 3274 3275 ieee80211_rx_handlers(&rx, &frames); 3276 } 3277 3278 /* main receive path */ 3279 3280 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) 3281 { 3282 struct ieee80211_sub_if_data *sdata = rx->sdata; 3283 struct sk_buff *skb = rx->skb; 3284 struct ieee80211_hdr *hdr = (void *)skb->data; 3285 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3286 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 3287 int multicast = is_multicast_ether_addr(hdr->addr1); 3288 3289 switch (sdata->vif.type) { 3290 case NL80211_IFTYPE_STATION: 3291 if (!bssid && !sdata->u.mgd.use_4addr) 3292 return false; 3293 if (multicast) 3294 return true; 3295 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3296 case NL80211_IFTYPE_ADHOC: 3297 if (!bssid) 3298 return false; 3299 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || 3300 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) 3301 return false; 3302 if (ieee80211_is_beacon(hdr->frame_control)) 3303 return true; 3304 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) 3305 return false; 3306 if (!multicast && 3307 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3308 return false; 3309 if (!rx->sta) { 3310 int rate_idx; 3311 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) 3312 rate_idx = 0; /* TODO: HT/VHT rates */ 3313 else 3314 rate_idx = status->rate_idx; 3315 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 3316 BIT(rate_idx)); 3317 } 3318 return true; 3319 case NL80211_IFTYPE_OCB: 3320 if (!bssid) 3321 return false; 3322 if (!ieee80211_is_data_present(hdr->frame_control)) 3323 return false; 3324 if (!is_broadcast_ether_addr(bssid)) 3325 return false; 3326 if (!multicast && 3327 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) 3328 return false; 3329 if (!rx->sta) { 3330 int rate_idx; 3331 if (status->flag & RX_FLAG_HT) 3332 rate_idx = 0; /* TODO: HT rates */ 3333 else 3334 rate_idx = status->rate_idx; 3335 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, 3336 BIT(rate_idx)); 3337 } 3338 return true; 3339 case NL80211_IFTYPE_MESH_POINT: 3340 if (multicast) 3341 return true; 3342 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3343 case NL80211_IFTYPE_AP_VLAN: 3344 case NL80211_IFTYPE_AP: 3345 if (!bssid) 3346 return ether_addr_equal(sdata->vif.addr, hdr->addr1); 3347 3348 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { 3349 /* 3350 * Accept public action frames even when the 3351 * BSSID doesn't match, this is used for P2P 3352 * and location updates. Note that mac80211 3353 * itself never looks at these frames. 3354 */ 3355 if (!multicast && 3356 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) 3357 return false; 3358 if (ieee80211_is_public_action(hdr, skb->len)) 3359 return true; 3360 return ieee80211_is_beacon(hdr->frame_control); 3361 } 3362 3363 if (!ieee80211_has_tods(hdr->frame_control)) { 3364 /* ignore data frames to TDLS-peers */ 3365 if (ieee80211_is_data(hdr->frame_control)) 3366 return false; 3367 /* ignore action frames to TDLS-peers */ 3368 if (ieee80211_is_action(hdr->frame_control) && 3369 !ether_addr_equal(bssid, hdr->addr1)) 3370 return false; 3371 } 3372 return true; 3373 case NL80211_IFTYPE_WDS: 3374 if (bssid || !ieee80211_is_data(hdr->frame_control)) 3375 return false; 3376 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2); 3377 case NL80211_IFTYPE_P2P_DEVICE: 3378 return ieee80211_is_public_action(hdr, skb->len) || 3379 ieee80211_is_probe_req(hdr->frame_control) || 3380 ieee80211_is_probe_resp(hdr->frame_control) || 3381 ieee80211_is_beacon(hdr->frame_control); 3382 default: 3383 break; 3384 } 3385 3386 WARN_ON_ONCE(1); 3387 return false; 3388 } 3389 3390 /* 3391 * This function returns whether or not the SKB 3392 * was destined for RX processing or not, which, 3393 * if consume is true, is equivalent to whether 3394 * or not the skb was consumed. 3395 */ 3396 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 3397 struct sk_buff *skb, bool consume) 3398 { 3399 struct ieee80211_local *local = rx->local; 3400 struct ieee80211_sub_if_data *sdata = rx->sdata; 3401 3402 rx->skb = skb; 3403 3404 if (!ieee80211_accept_frame(rx)) 3405 return false; 3406 3407 if (!consume) { 3408 skb = skb_copy(skb, GFP_ATOMIC); 3409 if (!skb) { 3410 if (net_ratelimit()) 3411 wiphy_debug(local->hw.wiphy, 3412 "failed to copy skb for %s\n", 3413 sdata->name); 3414 return true; 3415 } 3416 3417 rx->skb = skb; 3418 } 3419 3420 ieee80211_invoke_rx_handlers(rx); 3421 return true; 3422 } 3423 3424 /* 3425 * This is the actual Rx frames handler. as it belongs to Rx path it must 3426 * be called with rcu_read_lock protection. 3427 */ 3428 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 3429 struct sk_buff *skb, 3430 struct napi_struct *napi) 3431 { 3432 struct ieee80211_local *local = hw_to_local(hw); 3433 struct ieee80211_sub_if_data *sdata; 3434 struct ieee80211_hdr *hdr; 3435 __le16 fc; 3436 struct ieee80211_rx_data rx; 3437 struct ieee80211_sub_if_data *prev; 3438 struct sta_info *sta, *prev_sta; 3439 struct rhash_head *tmp; 3440 int err = 0; 3441 3442 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 3443 memset(&rx, 0, sizeof(rx)); 3444 rx.skb = skb; 3445 rx.local = local; 3446 rx.napi = napi; 3447 3448 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 3449 I802_DEBUG_INC(local->dot11ReceivedFragmentCount); 3450 3451 if (ieee80211_is_mgmt(fc)) { 3452 /* drop frame if too short for header */ 3453 if (skb->len < ieee80211_hdrlen(fc)) 3454 err = -ENOBUFS; 3455 else 3456 err = skb_linearize(skb); 3457 } else { 3458 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 3459 } 3460 3461 if (err) { 3462 dev_kfree_skb(skb); 3463 return; 3464 } 3465 3466 hdr = (struct ieee80211_hdr *)skb->data; 3467 ieee80211_parse_qos(&rx); 3468 ieee80211_verify_alignment(&rx); 3469 3470 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || 3471 ieee80211_is_beacon(hdr->frame_control))) 3472 ieee80211_scan_rx(local, skb); 3473 3474 if (ieee80211_is_data(fc)) { 3475 const struct bucket_table *tbl; 3476 3477 prev_sta = NULL; 3478 3479 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash); 3480 3481 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) { 3482 if (!prev_sta) { 3483 prev_sta = sta; 3484 continue; 3485 } 3486 3487 rx.sta = prev_sta; 3488 rx.sdata = prev_sta->sdata; 3489 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3490 3491 prev_sta = sta; 3492 } 3493 3494 if (prev_sta) { 3495 rx.sta = prev_sta; 3496 rx.sdata = prev_sta->sdata; 3497 3498 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3499 return; 3500 goto out; 3501 } 3502 } 3503 3504 prev = NULL; 3505 3506 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3507 if (!ieee80211_sdata_running(sdata)) 3508 continue; 3509 3510 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 3511 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3512 continue; 3513 3514 /* 3515 * frame is destined for this interface, but if it's 3516 * not also for the previous one we handle that after 3517 * the loop to avoid copying the SKB once too much 3518 */ 3519 3520 if (!prev) { 3521 prev = sdata; 3522 continue; 3523 } 3524 3525 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3526 rx.sdata = prev; 3527 ieee80211_prepare_and_rx_handle(&rx, skb, false); 3528 3529 prev = sdata; 3530 } 3531 3532 if (prev) { 3533 rx.sta = sta_info_get_bss(prev, hdr->addr2); 3534 rx.sdata = prev; 3535 3536 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3537 return; 3538 } 3539 3540 out: 3541 dev_kfree_skb(skb); 3542 } 3543 3544 /* 3545 * This is the receive path handler. It is called by a low level driver when an 3546 * 802.11 MPDU is received from the hardware. 3547 */ 3548 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb, 3549 struct napi_struct *napi) 3550 { 3551 struct ieee80211_local *local = hw_to_local(hw); 3552 struct ieee80211_rate *rate = NULL; 3553 struct ieee80211_supported_band *sband; 3554 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3555 3556 WARN_ON_ONCE(softirq_count() == 0); 3557 3558 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS)) 3559 goto drop; 3560 3561 sband = local->hw.wiphy->bands[status->band]; 3562 if (WARN_ON(!sband)) 3563 goto drop; 3564 3565 /* 3566 * If we're suspending, it is possible although not too likely 3567 * that we'd be receiving frames after having already partially 3568 * quiesced the stack. We can't process such frames then since 3569 * that might, for example, cause stations to be added or other 3570 * driver callbacks be invoked. 3571 */ 3572 if (unlikely(local->quiescing || local->suspended)) 3573 goto drop; 3574 3575 /* We might be during a HW reconfig, prevent Rx for the same reason */ 3576 if (unlikely(local->in_reconfig)) 3577 goto drop; 3578 3579 /* 3580 * The same happens when we're not even started, 3581 * but that's worth a warning. 3582 */ 3583 if (WARN_ON(!local->started)) 3584 goto drop; 3585 3586 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 3587 /* 3588 * Validate the rate, unless a PLCP error means that 3589 * we probably can't have a valid rate here anyway. 3590 */ 3591 3592 if (status->flag & RX_FLAG_HT) { 3593 /* 3594 * rate_idx is MCS index, which can be [0-76] 3595 * as documented on: 3596 * 3597 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 3598 * 3599 * Anything else would be some sort of driver or 3600 * hardware error. The driver should catch hardware 3601 * errors. 3602 */ 3603 if (WARN(status->rate_idx > 76, 3604 "Rate marked as an HT rate but passed " 3605 "status->rate_idx is not " 3606 "an MCS index [0-76]: %d (0x%02x)\n", 3607 status->rate_idx, 3608 status->rate_idx)) 3609 goto drop; 3610 } else if (status->flag & RX_FLAG_VHT) { 3611 if (WARN_ONCE(status->rate_idx > 9 || 3612 !status->vht_nss || 3613 status->vht_nss > 8, 3614 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", 3615 status->rate_idx, status->vht_nss)) 3616 goto drop; 3617 } else { 3618 if (WARN_ON(status->rate_idx >= sband->n_bitrates)) 3619 goto drop; 3620 rate = &sband->bitrates[status->rate_idx]; 3621 } 3622 } 3623 3624 status->rx_flags = 0; 3625 3626 /* 3627 * key references and virtual interfaces are protected using RCU 3628 * and this requires that we are in a read-side RCU section during 3629 * receive processing 3630 */ 3631 rcu_read_lock(); 3632 3633 /* 3634 * Frames with failed FCS/PLCP checksum are not returned, 3635 * all other frames are returned without radiotap header 3636 * if it was previously present. 3637 * Also, frames with less than 16 bytes are dropped. 3638 */ 3639 skb = ieee80211_rx_monitor(local, skb, rate); 3640 if (!skb) { 3641 rcu_read_unlock(); 3642 return; 3643 } 3644 3645 ieee80211_tpt_led_trig_rx(local, 3646 ((struct ieee80211_hdr *)skb->data)->frame_control, 3647 skb->len); 3648 __ieee80211_rx_handle_packet(hw, skb, napi); 3649 3650 rcu_read_unlock(); 3651 3652 return; 3653 drop: 3654 kfree_skb(skb); 3655 } 3656 EXPORT_SYMBOL(ieee80211_rx_napi); 3657 3658 /* This is a version of the rx handler that can be called from hard irq 3659 * context. Post the skb on the queue and schedule the tasklet */ 3660 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 3661 { 3662 struct ieee80211_local *local = hw_to_local(hw); 3663 3664 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 3665 3666 skb->pkt_type = IEEE80211_RX_MSG; 3667 skb_queue_tail(&local->skb_queue, skb); 3668 tasklet_schedule(&local->tasklet); 3669 } 3670 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 3671