1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/jiffies.h> 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rcupdate.h> 19 #include <linux/export.h> 20 #include <net/mac80211.h> 21 #include <net/ieee80211_radiotap.h> 22 23 #include "ieee80211_i.h" 24 #include "driver-ops.h" 25 #include "led.h" 26 #include "mesh.h" 27 #include "wep.h" 28 #include "wpa.h" 29 #include "tkip.h" 30 #include "wme.h" 31 #include "rate.h" 32 33 /* 34 * monitor mode reception 35 * 36 * This function cleans up the SKB, i.e. it removes all the stuff 37 * only useful for monitoring. 38 */ 39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, 40 struct sk_buff *skb) 41 { 42 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { 43 if (likely(skb->len > FCS_LEN)) 44 __pskb_trim(skb, skb->len - FCS_LEN); 45 else { 46 /* driver bug */ 47 WARN_ON(1); 48 dev_kfree_skb(skb); 49 skb = NULL; 50 } 51 } 52 53 return skb; 54 } 55 56 static inline int should_drop_frame(struct sk_buff *skb, 57 int present_fcs_len) 58 { 59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 60 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 61 62 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 63 return 1; 64 if (unlikely(skb->len < 16 + present_fcs_len)) 65 return 1; 66 if (ieee80211_is_ctl(hdr->frame_control) && 67 !ieee80211_is_pspoll(hdr->frame_control) && 68 !ieee80211_is_back_req(hdr->frame_control)) 69 return 1; 70 return 0; 71 } 72 73 static int 74 ieee80211_rx_radiotap_len(struct ieee80211_local *local, 75 struct ieee80211_rx_status *status) 76 { 77 int len; 78 79 /* always present fields */ 80 len = sizeof(struct ieee80211_radiotap_header) + 9; 81 82 if (status->flag & RX_FLAG_MACTIME_MPDU) 83 len += 8; 84 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 85 len += 1; 86 87 if (len & 1) /* padding for RX_FLAGS if necessary */ 88 len++; 89 90 if (status->flag & RX_FLAG_HT) /* HT info */ 91 len += 3; 92 93 return len; 94 } 95 96 /* 97 * ieee80211_add_rx_radiotap_header - add radiotap header 98 * 99 * add a radiotap header containing all the fields which the hardware provided. 100 */ 101 static void 102 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 103 struct sk_buff *skb, 104 struct ieee80211_rate *rate, 105 int rtap_len) 106 { 107 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 108 struct ieee80211_radiotap_header *rthdr; 109 unsigned char *pos; 110 u16 rx_flags = 0; 111 112 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); 113 memset(rthdr, 0, rtap_len); 114 115 /* radiotap header, set always present flags */ 116 rthdr->it_present = 117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | 118 (1 << IEEE80211_RADIOTAP_CHANNEL) | 119 (1 << IEEE80211_RADIOTAP_ANTENNA) | 120 (1 << IEEE80211_RADIOTAP_RX_FLAGS)); 121 rthdr->it_len = cpu_to_le16(rtap_len); 122 123 pos = (unsigned char *)(rthdr+1); 124 125 /* the order of the following fields is important */ 126 127 /* IEEE80211_RADIOTAP_TSFT */ 128 if (status->flag & RX_FLAG_MACTIME_MPDU) { 129 put_unaligned_le64(status->mactime, pos); 130 rthdr->it_present |= 131 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 132 pos += 8; 133 } 134 135 /* IEEE80211_RADIOTAP_FLAGS */ 136 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 137 *pos |= IEEE80211_RADIOTAP_F_FCS; 138 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 139 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 140 if (status->flag & RX_FLAG_SHORTPRE) 141 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 142 pos++; 143 144 /* IEEE80211_RADIOTAP_RATE */ 145 if (!rate || status->flag & RX_FLAG_HT) { 146 /* 147 * Without rate information don't add it. If we have, 148 * MCS information is a separate field in radiotap, 149 * added below. The byte here is needed as padding 150 * for the channel though, so initialise it to 0. 151 */ 152 *pos = 0; 153 } else { 154 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 155 *pos = rate->bitrate / 5; 156 } 157 pos++; 158 159 /* IEEE80211_RADIOTAP_CHANNEL */ 160 put_unaligned_le16(status->freq, pos); 161 pos += 2; 162 if (status->band == IEEE80211_BAND_5GHZ) 163 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, 164 pos); 165 else if (status->flag & RX_FLAG_HT) 166 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, 167 pos); 168 else if (rate && rate->flags & IEEE80211_RATE_ERP_G) 169 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, 170 pos); 171 else if (rate) 172 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, 173 pos); 174 else 175 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos); 176 pos += 2; 177 178 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 179 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { 180 *pos = status->signal; 181 rthdr->it_present |= 182 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 183 pos++; 184 } 185 186 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 187 188 /* IEEE80211_RADIOTAP_ANTENNA */ 189 *pos = status->antenna; 190 pos++; 191 192 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 193 194 /* IEEE80211_RADIOTAP_RX_FLAGS */ 195 /* ensure 2 byte alignment for the 2 byte field as required */ 196 if ((pos - (u8 *)rthdr) & 1) 197 pos++; 198 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 199 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 200 put_unaligned_le16(rx_flags, pos); 201 pos += 2; 202 203 if (status->flag & RX_FLAG_HT) { 204 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 205 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 206 IEEE80211_RADIOTAP_MCS_HAVE_GI | 207 IEEE80211_RADIOTAP_MCS_HAVE_BW; 208 *pos = 0; 209 if (status->flag & RX_FLAG_SHORT_GI) 210 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 211 if (status->flag & RX_FLAG_40MHZ) 212 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 213 pos++; 214 *pos++ = status->rate_idx; 215 } 216 } 217 218 /* 219 * This function copies a received frame to all monitor interfaces and 220 * returns a cleaned-up SKB that no longer includes the FCS nor the 221 * radiotap header the driver might have added. 222 */ 223 static struct sk_buff * 224 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 225 struct ieee80211_rate *rate) 226 { 227 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 228 struct ieee80211_sub_if_data *sdata; 229 int needed_headroom = 0; 230 struct sk_buff *skb, *skb2; 231 struct net_device *prev_dev = NULL; 232 int present_fcs_len = 0; 233 234 /* 235 * First, we may need to make a copy of the skb because 236 * (1) we need to modify it for radiotap (if not present), and 237 * (2) the other RX handlers will modify the skb we got. 238 * 239 * We don't need to, of course, if we aren't going to return 240 * the SKB because it has a bad FCS/PLCP checksum. 241 */ 242 243 /* room for the radiotap header based on driver features */ 244 needed_headroom = ieee80211_rx_radiotap_len(local, status); 245 246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 247 present_fcs_len = FCS_LEN; 248 249 /* make sure hdr->frame_control is on the linear part */ 250 if (!pskb_may_pull(origskb, 2)) { 251 dev_kfree_skb(origskb); 252 return NULL; 253 } 254 255 if (!local->monitors) { 256 if (should_drop_frame(origskb, present_fcs_len)) { 257 dev_kfree_skb(origskb); 258 return NULL; 259 } 260 261 return remove_monitor_info(local, origskb); 262 } 263 264 if (should_drop_frame(origskb, present_fcs_len)) { 265 /* only need to expand headroom if necessary */ 266 skb = origskb; 267 origskb = NULL; 268 269 /* 270 * This shouldn't trigger often because most devices have an 271 * RX header they pull before we get here, and that should 272 * be big enough for our radiotap information. We should 273 * probably export the length to drivers so that we can have 274 * them allocate enough headroom to start with. 275 */ 276 if (skb_headroom(skb) < needed_headroom && 277 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 278 dev_kfree_skb(skb); 279 return NULL; 280 } 281 } else { 282 /* 283 * Need to make a copy and possibly remove radiotap header 284 * and FCS from the original. 285 */ 286 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); 287 288 origskb = remove_monitor_info(local, origskb); 289 290 if (!skb) 291 return origskb; 292 } 293 294 /* prepend radiotap information */ 295 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); 296 297 skb_reset_mac_header(skb); 298 skb->ip_summed = CHECKSUM_UNNECESSARY; 299 skb->pkt_type = PACKET_OTHERHOST; 300 skb->protocol = htons(ETH_P_802_2); 301 302 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 303 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) 304 continue; 305 306 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) 307 continue; 308 309 if (!ieee80211_sdata_running(sdata)) 310 continue; 311 312 if (prev_dev) { 313 skb2 = skb_clone(skb, GFP_ATOMIC); 314 if (skb2) { 315 skb2->dev = prev_dev; 316 netif_receive_skb(skb2); 317 } 318 } 319 320 prev_dev = sdata->dev; 321 sdata->dev->stats.rx_packets++; 322 sdata->dev->stats.rx_bytes += skb->len; 323 } 324 325 if (prev_dev) { 326 skb->dev = prev_dev; 327 netif_receive_skb(skb); 328 } else 329 dev_kfree_skb(skb); 330 331 return origskb; 332 } 333 334 335 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 336 { 337 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 338 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 339 int tid, seqno_idx, security_idx; 340 341 /* does the frame have a qos control field? */ 342 if (ieee80211_is_data_qos(hdr->frame_control)) { 343 u8 *qc = ieee80211_get_qos_ctl(hdr); 344 /* frame has qos control */ 345 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 346 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 347 status->rx_flags |= IEEE80211_RX_AMSDU; 348 349 seqno_idx = tid; 350 security_idx = tid; 351 } else { 352 /* 353 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 354 * 355 * Sequence numbers for management frames, QoS data 356 * frames with a broadcast/multicast address in the 357 * Address 1 field, and all non-QoS data frames sent 358 * by QoS STAs are assigned using an additional single 359 * modulo-4096 counter, [...] 360 * 361 * We also use that counter for non-QoS STAs. 362 */ 363 seqno_idx = NUM_RX_DATA_QUEUES; 364 security_idx = 0; 365 if (ieee80211_is_mgmt(hdr->frame_control)) 366 security_idx = NUM_RX_DATA_QUEUES; 367 tid = 0; 368 } 369 370 rx->seqno_idx = seqno_idx; 371 rx->security_idx = security_idx; 372 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 373 * For now, set skb->priority to 0 for other cases. */ 374 rx->skb->priority = (tid > 7) ? 0 : tid; 375 } 376 377 /** 378 * DOC: Packet alignment 379 * 380 * Drivers always need to pass packets that are aligned to two-byte boundaries 381 * to the stack. 382 * 383 * Additionally, should, if possible, align the payload data in a way that 384 * guarantees that the contained IP header is aligned to a four-byte 385 * boundary. In the case of regular frames, this simply means aligning the 386 * payload to a four-byte boundary (because either the IP header is directly 387 * contained, or IV/RFC1042 headers that have a length divisible by four are 388 * in front of it). If the payload data is not properly aligned and the 389 * architecture doesn't support efficient unaligned operations, mac80211 390 * will align the data. 391 * 392 * With A-MSDU frames, however, the payload data address must yield two modulo 393 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 394 * push the IP header further back to a multiple of four again. Thankfully, the 395 * specs were sane enough this time around to require padding each A-MSDU 396 * subframe to a length that is a multiple of four. 397 * 398 * Padding like Atheros hardware adds which is between the 802.11 header and 399 * the payload is not supported, the driver is required to move the 802.11 400 * header to be directly in front of the payload in that case. 401 */ 402 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 403 { 404 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 405 WARN_ONCE((unsigned long)rx->skb->data & 1, 406 "unaligned packet at 0x%p\n", rx->skb->data); 407 #endif 408 } 409 410 411 /* rx handlers */ 412 413 static ieee80211_rx_result debug_noinline 414 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) 415 { 416 struct ieee80211_local *local = rx->local; 417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 418 struct sk_buff *skb = rx->skb; 419 420 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) && 421 !local->sched_scanning)) 422 return RX_CONTINUE; 423 424 if (test_bit(SCAN_HW_SCANNING, &local->scanning) || 425 test_bit(SCAN_SW_SCANNING, &local->scanning) || 426 local->sched_scanning) 427 return ieee80211_scan_rx(rx->sdata, skb); 428 429 /* scanning finished during invoking of handlers */ 430 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); 431 return RX_DROP_UNUSABLE; 432 } 433 434 435 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 436 { 437 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 438 439 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) 440 return 0; 441 442 return ieee80211_is_robust_mgmt_frame(hdr); 443 } 444 445 446 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 447 { 448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 449 450 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) 451 return 0; 452 453 return ieee80211_is_robust_mgmt_frame(hdr); 454 } 455 456 457 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 458 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 459 { 460 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 461 struct ieee80211_mmie *mmie; 462 463 if (skb->len < 24 + sizeof(*mmie) || 464 !is_multicast_ether_addr(hdr->da)) 465 return -1; 466 467 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) 468 return -1; /* not a robust management frame */ 469 470 mmie = (struct ieee80211_mmie *) 471 (skb->data + skb->len - sizeof(*mmie)); 472 if (mmie->element_id != WLAN_EID_MMIE || 473 mmie->length != sizeof(*mmie) - 2) 474 return -1; 475 476 return le16_to_cpu(mmie->key_id); 477 } 478 479 480 static ieee80211_rx_result 481 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 482 { 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 484 char *dev_addr = rx->sdata->vif.addr; 485 486 if (ieee80211_is_data(hdr->frame_control)) { 487 if (is_multicast_ether_addr(hdr->addr1)) { 488 if (ieee80211_has_tods(hdr->frame_control) || 489 !ieee80211_has_fromds(hdr->frame_control)) 490 return RX_DROP_MONITOR; 491 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) 492 return RX_DROP_MONITOR; 493 } else { 494 if (!ieee80211_has_a4(hdr->frame_control)) 495 return RX_DROP_MONITOR; 496 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) 497 return RX_DROP_MONITOR; 498 } 499 } 500 501 /* If there is not an established peer link and this is not a peer link 502 * establisment frame, beacon or probe, drop the frame. 503 */ 504 505 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 506 struct ieee80211_mgmt *mgmt; 507 508 if (!ieee80211_is_mgmt(hdr->frame_control)) 509 return RX_DROP_MONITOR; 510 511 if (ieee80211_is_action(hdr->frame_control)) { 512 u8 category; 513 mgmt = (struct ieee80211_mgmt *)hdr; 514 category = mgmt->u.action.category; 515 if (category != WLAN_CATEGORY_MESH_ACTION && 516 category != WLAN_CATEGORY_SELF_PROTECTED) 517 return RX_DROP_MONITOR; 518 return RX_CONTINUE; 519 } 520 521 if (ieee80211_is_probe_req(hdr->frame_control) || 522 ieee80211_is_probe_resp(hdr->frame_control) || 523 ieee80211_is_beacon(hdr->frame_control) || 524 ieee80211_is_auth(hdr->frame_control)) 525 return RX_CONTINUE; 526 527 return RX_DROP_MONITOR; 528 529 } 530 531 return RX_CONTINUE; 532 } 533 534 #define SEQ_MODULO 0x1000 535 #define SEQ_MASK 0xfff 536 537 static inline int seq_less(u16 sq1, u16 sq2) 538 { 539 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); 540 } 541 542 static inline u16 seq_inc(u16 sq) 543 { 544 return (sq + 1) & SEQ_MASK; 545 } 546 547 static inline u16 seq_sub(u16 sq1, u16 sq2) 548 { 549 return (sq1 - sq2) & SEQ_MASK; 550 } 551 552 553 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, 554 struct tid_ampdu_rx *tid_agg_rx, 555 int index) 556 { 557 struct ieee80211_local *local = hw_to_local(hw); 558 struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; 559 struct ieee80211_rx_status *status; 560 561 lockdep_assert_held(&tid_agg_rx->reorder_lock); 562 563 if (!skb) 564 goto no_frame; 565 566 /* release the frame from the reorder ring buffer */ 567 tid_agg_rx->stored_mpdu_num--; 568 tid_agg_rx->reorder_buf[index] = NULL; 569 status = IEEE80211_SKB_RXCB(skb); 570 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 571 skb_queue_tail(&local->rx_skb_queue, skb); 572 573 no_frame: 574 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); 575 } 576 577 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, 578 struct tid_ampdu_rx *tid_agg_rx, 579 u16 head_seq_num) 580 { 581 int index; 582 583 lockdep_assert_held(&tid_agg_rx->reorder_lock); 584 585 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { 586 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 587 tid_agg_rx->buf_size; 588 ieee80211_release_reorder_frame(hw, tid_agg_rx, index); 589 } 590 } 591 592 /* 593 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 594 * the skb was added to the buffer longer than this time ago, the earlier 595 * frames that have not yet been received are assumed to be lost and the skb 596 * can be released for processing. This may also release other skb's from the 597 * reorder buffer if there are no additional gaps between the frames. 598 * 599 * Callers must hold tid_agg_rx->reorder_lock. 600 */ 601 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 602 603 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, 604 struct tid_ampdu_rx *tid_agg_rx) 605 { 606 int index, j; 607 608 lockdep_assert_held(&tid_agg_rx->reorder_lock); 609 610 /* release the buffer until next missing frame */ 611 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 612 tid_agg_rx->buf_size; 613 if (!tid_agg_rx->reorder_buf[index] && 614 tid_agg_rx->stored_mpdu_num) { 615 /* 616 * No buffers ready to be released, but check whether any 617 * frames in the reorder buffer have timed out. 618 */ 619 int skipped = 1; 620 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 621 j = (j + 1) % tid_agg_rx->buf_size) { 622 if (!tid_agg_rx->reorder_buf[j]) { 623 skipped++; 624 continue; 625 } 626 if (skipped && 627 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 628 HT_RX_REORDER_BUF_TIMEOUT)) 629 goto set_release_timer; 630 631 #ifdef CONFIG_MAC80211_HT_DEBUG 632 if (net_ratelimit()) 633 wiphy_debug(hw->wiphy, 634 "release an RX reorder frame due to timeout on earlier frames\n"); 635 #endif 636 ieee80211_release_reorder_frame(hw, tid_agg_rx, j); 637 638 /* 639 * Increment the head seq# also for the skipped slots. 640 */ 641 tid_agg_rx->head_seq_num = 642 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; 643 skipped = 0; 644 } 645 } else while (tid_agg_rx->reorder_buf[index]) { 646 ieee80211_release_reorder_frame(hw, tid_agg_rx, index); 647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 648 tid_agg_rx->buf_size; 649 } 650 651 if (tid_agg_rx->stored_mpdu_num) { 652 j = index = seq_sub(tid_agg_rx->head_seq_num, 653 tid_agg_rx->ssn) % tid_agg_rx->buf_size; 654 655 for (; j != (index - 1) % tid_agg_rx->buf_size; 656 j = (j + 1) % tid_agg_rx->buf_size) { 657 if (tid_agg_rx->reorder_buf[j]) 658 break; 659 } 660 661 set_release_timer: 662 663 mod_timer(&tid_agg_rx->reorder_timer, 664 tid_agg_rx->reorder_time[j] + 1 + 665 HT_RX_REORDER_BUF_TIMEOUT); 666 } else { 667 del_timer(&tid_agg_rx->reorder_timer); 668 } 669 } 670 671 /* 672 * As this function belongs to the RX path it must be under 673 * rcu_read_lock protection. It returns false if the frame 674 * can be processed immediately, true if it was consumed. 675 */ 676 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, 677 struct tid_ampdu_rx *tid_agg_rx, 678 struct sk_buff *skb) 679 { 680 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 681 u16 sc = le16_to_cpu(hdr->seq_ctrl); 682 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 683 u16 head_seq_num, buf_size; 684 int index; 685 bool ret = true; 686 687 spin_lock(&tid_agg_rx->reorder_lock); 688 689 buf_size = tid_agg_rx->buf_size; 690 head_seq_num = tid_agg_rx->head_seq_num; 691 692 /* frame with out of date sequence number */ 693 if (seq_less(mpdu_seq_num, head_seq_num)) { 694 dev_kfree_skb(skb); 695 goto out; 696 } 697 698 /* 699 * If frame the sequence number exceeds our buffering window 700 * size release some previous frames to make room for this one. 701 */ 702 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { 703 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); 704 /* release stored frames up to new head to stack */ 705 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); 706 } 707 708 /* Now the new frame is always in the range of the reordering buffer */ 709 710 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; 711 712 /* check if we already stored this frame */ 713 if (tid_agg_rx->reorder_buf[index]) { 714 dev_kfree_skb(skb); 715 goto out; 716 } 717 718 /* 719 * If the current MPDU is in the right order and nothing else 720 * is stored we can process it directly, no need to buffer it. 721 * If it is first but there's something stored, we may be able 722 * to release frames after this one. 723 */ 724 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 725 tid_agg_rx->stored_mpdu_num == 0) { 726 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); 727 ret = false; 728 goto out; 729 } 730 731 /* put the frame in the reordering buffer */ 732 tid_agg_rx->reorder_buf[index] = skb; 733 tid_agg_rx->reorder_time[index] = jiffies; 734 tid_agg_rx->stored_mpdu_num++; 735 ieee80211_sta_reorder_release(hw, tid_agg_rx); 736 737 out: 738 spin_unlock(&tid_agg_rx->reorder_lock); 739 return ret; 740 } 741 742 /* 743 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 744 * true if the MPDU was buffered, false if it should be processed. 745 */ 746 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) 747 { 748 struct sk_buff *skb = rx->skb; 749 struct ieee80211_local *local = rx->local; 750 struct ieee80211_hw *hw = &local->hw; 751 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 753 struct sta_info *sta = rx->sta; 754 struct tid_ampdu_rx *tid_agg_rx; 755 u16 sc; 756 u8 tid, ack_policy; 757 758 if (!ieee80211_is_data_qos(hdr->frame_control)) 759 goto dont_reorder; 760 761 /* 762 * filter the QoS data rx stream according to 763 * STA/TID and check if this STA/TID is on aggregation 764 */ 765 766 if (!sta) 767 goto dont_reorder; 768 769 ack_policy = *ieee80211_get_qos_ctl(hdr) & 770 IEEE80211_QOS_CTL_ACK_POLICY_MASK; 771 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 772 773 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 774 if (!tid_agg_rx) 775 goto dont_reorder; 776 777 /* qos null data frames are excluded */ 778 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 779 goto dont_reorder; 780 781 /* not part of a BA session */ 782 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && 783 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) 784 goto dont_reorder; 785 786 /* not actually part of this BA session */ 787 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 788 goto dont_reorder; 789 790 /* new, potentially un-ordered, ampdu frame - process it */ 791 792 /* reset session timer */ 793 if (tid_agg_rx->timeout) 794 mod_timer(&tid_agg_rx->session_timer, 795 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 796 797 /* if this mpdu is fragmented - terminate rx aggregation session */ 798 sc = le16_to_cpu(hdr->seq_ctrl); 799 if (sc & IEEE80211_SCTL_FRAG) { 800 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 801 skb_queue_tail(&rx->sdata->skb_queue, skb); 802 ieee80211_queue_work(&local->hw, &rx->sdata->work); 803 return; 804 } 805 806 /* 807 * No locking needed -- we will only ever process one 808 * RX packet at a time, and thus own tid_agg_rx. All 809 * other code manipulating it needs to (and does) make 810 * sure that we cannot get to it any more before doing 811 * anything with it. 812 */ 813 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) 814 return; 815 816 dont_reorder: 817 skb_queue_tail(&local->rx_skb_queue, skb); 818 } 819 820 static ieee80211_rx_result debug_noinline 821 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 822 { 823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 825 826 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ 827 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { 828 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 829 rx->sta->last_seq_ctrl[rx->seqno_idx] == 830 hdr->seq_ctrl)) { 831 if (status->rx_flags & IEEE80211_RX_RA_MATCH) { 832 rx->local->dot11FrameDuplicateCount++; 833 rx->sta->num_duplicates++; 834 } 835 return RX_DROP_UNUSABLE; 836 } else 837 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 838 } 839 840 if (unlikely(rx->skb->len < 16)) { 841 I802_DEBUG_INC(rx->local->rx_handlers_drop_short); 842 return RX_DROP_MONITOR; 843 } 844 845 /* Drop disallowed frame classes based on STA auth/assoc state; 846 * IEEE 802.11, Chap 5.5. 847 * 848 * mac80211 filters only based on association state, i.e. it drops 849 * Class 3 frames from not associated stations. hostapd sends 850 * deauth/disassoc frames when needed. In addition, hostapd is 851 * responsible for filtering on both auth and assoc states. 852 */ 853 854 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 855 return ieee80211_rx_mesh_check(rx); 856 857 if (unlikely((ieee80211_is_data(hdr->frame_control) || 858 ieee80211_is_pspoll(hdr->frame_control)) && 859 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 860 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 861 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { 862 if (rx->sta && rx->sta->dummy && 863 ieee80211_is_data_present(hdr->frame_control)) { 864 u16 ethertype; 865 u8 *payload; 866 867 payload = rx->skb->data + 868 ieee80211_hdrlen(hdr->frame_control); 869 ethertype = (payload[6] << 8) | payload[7]; 870 if (cpu_to_be16(ethertype) == 871 rx->sdata->control_port_protocol) 872 return RX_CONTINUE; 873 } 874 875 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 876 cfg80211_rx_spurious_frame(rx->sdata->dev, 877 hdr->addr2, 878 GFP_ATOMIC)) 879 return RX_DROP_UNUSABLE; 880 881 return RX_DROP_MONITOR; 882 } 883 884 return RX_CONTINUE; 885 } 886 887 888 static ieee80211_rx_result debug_noinline 889 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 890 { 891 struct sk_buff *skb = rx->skb; 892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 893 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 894 int keyidx; 895 int hdrlen; 896 ieee80211_rx_result result = RX_DROP_UNUSABLE; 897 struct ieee80211_key *sta_ptk = NULL; 898 int mmie_keyidx = -1; 899 __le16 fc; 900 901 /* 902 * Key selection 101 903 * 904 * There are four types of keys: 905 * - GTK (group keys) 906 * - IGTK (group keys for management frames) 907 * - PTK (pairwise keys) 908 * - STK (station-to-station pairwise keys) 909 * 910 * When selecting a key, we have to distinguish between multicast 911 * (including broadcast) and unicast frames, the latter can only 912 * use PTKs and STKs while the former always use GTKs and IGTKs. 913 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 914 * unicast frames can also use key indices like GTKs. Hence, if we 915 * don't have a PTK/STK we check the key index for a WEP key. 916 * 917 * Note that in a regular BSS, multicast frames are sent by the 918 * AP only, associated stations unicast the frame to the AP first 919 * which then multicasts it on their behalf. 920 * 921 * There is also a slight problem in IBSS mode: GTKs are negotiated 922 * with each station, that is something we don't currently handle. 923 * The spec seems to expect that one negotiates the same key with 924 * every station but there's no such requirement; VLANs could be 925 * possible. 926 */ 927 928 /* 929 * No point in finding a key and decrypting if the frame is neither 930 * addressed to us nor a multicast frame. 931 */ 932 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 933 return RX_CONTINUE; 934 935 /* start without a key */ 936 rx->key = NULL; 937 938 if (rx->sta) 939 sta_ptk = rcu_dereference(rx->sta->ptk); 940 941 fc = hdr->frame_control; 942 943 if (!ieee80211_has_protected(fc)) 944 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 945 946 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 947 rx->key = sta_ptk; 948 if ((status->flag & RX_FLAG_DECRYPTED) && 949 (status->flag & RX_FLAG_IV_STRIPPED)) 950 return RX_CONTINUE; 951 /* Skip decryption if the frame is not protected. */ 952 if (!ieee80211_has_protected(fc)) 953 return RX_CONTINUE; 954 } else if (mmie_keyidx >= 0) { 955 /* Broadcast/multicast robust management frame / BIP */ 956 if ((status->flag & RX_FLAG_DECRYPTED) && 957 (status->flag & RX_FLAG_IV_STRIPPED)) 958 return RX_CONTINUE; 959 960 if (mmie_keyidx < NUM_DEFAULT_KEYS || 961 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 962 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 963 if (rx->sta) 964 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 965 if (!rx->key) 966 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 967 } else if (!ieee80211_has_protected(fc)) { 968 /* 969 * The frame was not protected, so skip decryption. However, we 970 * need to set rx->key if there is a key that could have been 971 * used so that the frame may be dropped if encryption would 972 * have been expected. 973 */ 974 struct ieee80211_key *key = NULL; 975 struct ieee80211_sub_if_data *sdata = rx->sdata; 976 int i; 977 978 if (ieee80211_is_mgmt(fc) && 979 is_multicast_ether_addr(hdr->addr1) && 980 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 981 rx->key = key; 982 else { 983 if (rx->sta) { 984 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 985 key = rcu_dereference(rx->sta->gtk[i]); 986 if (key) 987 break; 988 } 989 } 990 if (!key) { 991 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 992 key = rcu_dereference(sdata->keys[i]); 993 if (key) 994 break; 995 } 996 } 997 if (key) 998 rx->key = key; 999 } 1000 return RX_CONTINUE; 1001 } else { 1002 u8 keyid; 1003 /* 1004 * The device doesn't give us the IV so we won't be 1005 * able to look up the key. That's ok though, we 1006 * don't need to decrypt the frame, we just won't 1007 * be able to keep statistics accurate. 1008 * Except for key threshold notifications, should 1009 * we somehow allow the driver to tell us which key 1010 * the hardware used if this flag is set? 1011 */ 1012 if ((status->flag & RX_FLAG_DECRYPTED) && 1013 (status->flag & RX_FLAG_IV_STRIPPED)) 1014 return RX_CONTINUE; 1015 1016 hdrlen = ieee80211_hdrlen(fc); 1017 1018 if (rx->skb->len < 8 + hdrlen) 1019 return RX_DROP_UNUSABLE; /* TODO: count this? */ 1020 1021 /* 1022 * no need to call ieee80211_wep_get_keyidx, 1023 * it verifies a bunch of things we've done already 1024 */ 1025 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 1026 keyidx = keyid >> 6; 1027 1028 /* check per-station GTK first, if multicast packet */ 1029 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1030 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1031 1032 /* if not found, try default key */ 1033 if (!rx->key) { 1034 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1035 1036 /* 1037 * RSNA-protected unicast frames should always be 1038 * sent with pairwise or station-to-station keys, 1039 * but for WEP we allow using a key index as well. 1040 */ 1041 if (rx->key && 1042 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 1043 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 1044 !is_multicast_ether_addr(hdr->addr1)) 1045 rx->key = NULL; 1046 } 1047 } 1048 1049 if (rx->key) { 1050 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 1051 return RX_DROP_MONITOR; 1052 1053 rx->key->tx_rx_count++; 1054 /* TODO: add threshold stuff again */ 1055 } else { 1056 return RX_DROP_MONITOR; 1057 } 1058 1059 if (skb_linearize(rx->skb)) 1060 return RX_DROP_UNUSABLE; 1061 /* the hdr variable is invalid now! */ 1062 1063 switch (rx->key->conf.cipher) { 1064 case WLAN_CIPHER_SUITE_WEP40: 1065 case WLAN_CIPHER_SUITE_WEP104: 1066 /* Check for weak IVs if possible */ 1067 if (rx->sta && ieee80211_is_data(fc) && 1068 (!(status->flag & RX_FLAG_IV_STRIPPED) || 1069 !(status->flag & RX_FLAG_DECRYPTED)) && 1070 ieee80211_wep_is_weak_iv(rx->skb, rx->key)) 1071 rx->sta->wep_weak_iv_count++; 1072 1073 result = ieee80211_crypto_wep_decrypt(rx); 1074 break; 1075 case WLAN_CIPHER_SUITE_TKIP: 1076 result = ieee80211_crypto_tkip_decrypt(rx); 1077 break; 1078 case WLAN_CIPHER_SUITE_CCMP: 1079 result = ieee80211_crypto_ccmp_decrypt(rx); 1080 break; 1081 case WLAN_CIPHER_SUITE_AES_CMAC: 1082 result = ieee80211_crypto_aes_cmac_decrypt(rx); 1083 break; 1084 default: 1085 /* 1086 * We can reach here only with HW-only algorithms 1087 * but why didn't it decrypt the frame?! 1088 */ 1089 return RX_DROP_UNUSABLE; 1090 } 1091 1092 /* either the frame has been decrypted or will be dropped */ 1093 status->flag |= RX_FLAG_DECRYPTED; 1094 1095 return result; 1096 } 1097 1098 static ieee80211_rx_result debug_noinline 1099 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1100 { 1101 struct ieee80211_local *local; 1102 struct ieee80211_hdr *hdr; 1103 struct sk_buff *skb; 1104 1105 local = rx->local; 1106 skb = rx->skb; 1107 hdr = (struct ieee80211_hdr *) skb->data; 1108 1109 if (!local->pspolling) 1110 return RX_CONTINUE; 1111 1112 if (!ieee80211_has_fromds(hdr->frame_control)) 1113 /* this is not from AP */ 1114 return RX_CONTINUE; 1115 1116 if (!ieee80211_is_data(hdr->frame_control)) 1117 return RX_CONTINUE; 1118 1119 if (!ieee80211_has_moredata(hdr->frame_control)) { 1120 /* AP has no more frames buffered for us */ 1121 local->pspolling = false; 1122 return RX_CONTINUE; 1123 } 1124 1125 /* more data bit is set, let's request a new frame from the AP */ 1126 ieee80211_send_pspoll(local, rx->sdata); 1127 1128 return RX_CONTINUE; 1129 } 1130 1131 static void ap_sta_ps_start(struct sta_info *sta) 1132 { 1133 struct ieee80211_sub_if_data *sdata = sta->sdata; 1134 struct ieee80211_local *local = sdata->local; 1135 1136 atomic_inc(&sdata->bss->num_sta_ps); 1137 set_sta_flag(sta, WLAN_STA_PS_STA); 1138 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1139 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1140 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1141 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", 1142 sdata->name, sta->sta.addr, sta->sta.aid); 1143 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1144 } 1145 1146 static void ap_sta_ps_end(struct sta_info *sta) 1147 { 1148 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1149 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", 1150 sta->sdata->name, sta->sta.addr, sta->sta.aid); 1151 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1152 1153 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { 1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1155 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", 1156 sta->sdata->name, sta->sta.addr, sta->sta.aid); 1157 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1158 return; 1159 } 1160 1161 ieee80211_sta_ps_deliver_wakeup(sta); 1162 } 1163 1164 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) 1165 { 1166 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); 1167 bool in_ps; 1168 1169 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); 1170 1171 /* Don't let the same PS state be set twice */ 1172 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); 1173 if ((start && in_ps) || (!start && !in_ps)) 1174 return -EINVAL; 1175 1176 if (start) 1177 ap_sta_ps_start(sta_inf); 1178 else 1179 ap_sta_ps_end(sta_inf); 1180 1181 return 0; 1182 } 1183 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1184 1185 static ieee80211_rx_result debug_noinline 1186 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) 1187 { 1188 struct ieee80211_sub_if_data *sdata = rx->sdata; 1189 struct ieee80211_hdr *hdr = (void *)rx->skb->data; 1190 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1191 int tid, ac; 1192 1193 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1194 return RX_CONTINUE; 1195 1196 if (sdata->vif.type != NL80211_IFTYPE_AP && 1197 sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 1198 return RX_CONTINUE; 1199 1200 /* 1201 * The device handles station powersave, so don't do anything about 1202 * uAPSD and PS-Poll frames (the latter shouldn't even come up from 1203 * it to mac80211 since they're handled.) 1204 */ 1205 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) 1206 return RX_CONTINUE; 1207 1208 /* 1209 * Don't do anything if the station isn't already asleep. In 1210 * the uAPSD case, the station will probably be marked asleep, 1211 * in the PS-Poll case the station must be confused ... 1212 */ 1213 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) 1214 return RX_CONTINUE; 1215 1216 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { 1217 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { 1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1219 ieee80211_sta_ps_deliver_poll_response(rx->sta); 1220 else 1221 set_sta_flag(rx->sta, WLAN_STA_PSPOLL); 1222 } 1223 1224 /* Free PS Poll skb here instead of returning RX_DROP that would 1225 * count as an dropped frame. */ 1226 dev_kfree_skb(rx->skb); 1227 1228 return RX_QUEUED; 1229 } else if (!ieee80211_has_morefrags(hdr->frame_control) && 1230 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1231 ieee80211_has_pm(hdr->frame_control) && 1232 (ieee80211_is_data_qos(hdr->frame_control) || 1233 ieee80211_is_qos_nullfunc(hdr->frame_control))) { 1234 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 1235 ac = ieee802_1d_to_ac[tid & 7]; 1236 1237 /* 1238 * If this AC is not trigger-enabled do nothing. 1239 * 1240 * NB: This could/should check a separate bitmap of trigger- 1241 * enabled queues, but for now we only implement uAPSD w/o 1242 * TSPEC changes to the ACs, so they're always the same. 1243 */ 1244 if (!(rx->sta->sta.uapsd_queues & BIT(ac))) 1245 return RX_CONTINUE; 1246 1247 /* if we are in a service period, do nothing */ 1248 if (test_sta_flag(rx->sta, WLAN_STA_SP)) 1249 return RX_CONTINUE; 1250 1251 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) 1252 ieee80211_sta_ps_deliver_uapsd(rx->sta); 1253 else 1254 set_sta_flag(rx->sta, WLAN_STA_UAPSD); 1255 } 1256 1257 return RX_CONTINUE; 1258 } 1259 1260 static ieee80211_rx_result debug_noinline 1261 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1262 { 1263 struct sta_info *sta = rx->sta; 1264 struct sk_buff *skb = rx->skb; 1265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1267 1268 if (!sta) 1269 return RX_CONTINUE; 1270 1271 /* 1272 * Update last_rx only for IBSS packets which are for the current 1273 * BSSID to avoid keeping the current IBSS network alive in cases 1274 * where other STAs start using different BSSID. 1275 */ 1276 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1277 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1278 NL80211_IFTYPE_ADHOC); 1279 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) { 1280 sta->last_rx = jiffies; 1281 if (ieee80211_is_data(hdr->frame_control)) { 1282 sta->last_rx_rate_idx = status->rate_idx; 1283 sta->last_rx_rate_flag = status->flag; 1284 } 1285 } 1286 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1287 /* 1288 * Mesh beacons will update last_rx when if they are found to 1289 * match the current local configuration when processed. 1290 */ 1291 sta->last_rx = jiffies; 1292 if (ieee80211_is_data(hdr->frame_control)) { 1293 sta->last_rx_rate_idx = status->rate_idx; 1294 sta->last_rx_rate_flag = status->flag; 1295 } 1296 } 1297 1298 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1299 return RX_CONTINUE; 1300 1301 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1302 ieee80211_sta_rx_notify(rx->sdata, hdr); 1303 1304 sta->rx_fragments++; 1305 sta->rx_bytes += rx->skb->len; 1306 sta->last_signal = status->signal; 1307 ewma_add(&sta->avg_signal, -status->signal); 1308 1309 /* 1310 * Change STA power saving mode only at the end of a frame 1311 * exchange sequence. 1312 */ 1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && 1314 !ieee80211_has_morefrags(hdr->frame_control) && 1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 1319 /* 1320 * Ignore doze->wake transitions that are 1321 * indicated by non-data frames, the standard 1322 * is unclear here, but for example going to 1323 * PS mode and then scanning would cause a 1324 * doze->wake transition for the probe request, 1325 * and that is clearly undesirable. 1326 */ 1327 if (ieee80211_is_data(hdr->frame_control) && 1328 !ieee80211_has_pm(hdr->frame_control)) 1329 ap_sta_ps_end(sta); 1330 } else { 1331 if (ieee80211_has_pm(hdr->frame_control)) 1332 ap_sta_ps_start(sta); 1333 } 1334 } 1335 1336 /* 1337 * Drop (qos-)data::nullfunc frames silently, since they 1338 * are used only to control station power saving mode. 1339 */ 1340 if (ieee80211_is_nullfunc(hdr->frame_control) || 1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1343 1344 /* 1345 * If we receive a 4-addr nullfunc frame from a STA 1346 * that was not moved to a 4-addr STA vlan yet send 1347 * the event to userspace and for older hostapd drop 1348 * the frame to the monitor interface. 1349 */ 1350 if (ieee80211_has_a4(hdr->frame_control) && 1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1353 !rx->sdata->u.vlan.sta))) { 1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) 1355 cfg80211_rx_unexpected_4addr_frame( 1356 rx->sdata->dev, sta->sta.addr, 1357 GFP_ATOMIC); 1358 return RX_DROP_MONITOR; 1359 } 1360 /* 1361 * Update counter and free packet here to avoid 1362 * counting this as a dropped packed. 1363 */ 1364 sta->rx_packets++; 1365 dev_kfree_skb(rx->skb); 1366 return RX_QUEUED; 1367 } 1368 1369 return RX_CONTINUE; 1370 } /* ieee80211_rx_h_sta_process */ 1371 1372 static inline struct ieee80211_fragment_entry * 1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, 1374 unsigned int frag, unsigned int seq, int rx_queue, 1375 struct sk_buff **skb) 1376 { 1377 struct ieee80211_fragment_entry *entry; 1378 int idx; 1379 1380 idx = sdata->fragment_next; 1381 entry = &sdata->fragments[sdata->fragment_next++]; 1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) 1383 sdata->fragment_next = 0; 1384 1385 if (!skb_queue_empty(&entry->skb_list)) { 1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1387 struct ieee80211_hdr *hdr = 1388 (struct ieee80211_hdr *) entry->skb_list.next->data; 1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest " 1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " 1391 "addr1=%pM addr2=%pM\n", 1392 sdata->name, idx, 1393 jiffies - entry->first_frag_time, entry->seq, 1394 entry->last_frag, hdr->addr1, hdr->addr2); 1395 #endif 1396 __skb_queue_purge(&entry->skb_list); 1397 } 1398 1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 1400 *skb = NULL; 1401 entry->first_frag_time = jiffies; 1402 entry->seq = seq; 1403 entry->rx_queue = rx_queue; 1404 entry->last_frag = frag; 1405 entry->ccmp = 0; 1406 entry->extra_len = 0; 1407 1408 return entry; 1409 } 1410 1411 static inline struct ieee80211_fragment_entry * 1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, 1413 unsigned int frag, unsigned int seq, 1414 int rx_queue, struct ieee80211_hdr *hdr) 1415 { 1416 struct ieee80211_fragment_entry *entry; 1417 int i, idx; 1418 1419 idx = sdata->fragment_next; 1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 1421 struct ieee80211_hdr *f_hdr; 1422 1423 idx--; 1424 if (idx < 0) 1425 idx = IEEE80211_FRAGMENT_MAX - 1; 1426 1427 entry = &sdata->fragments[idx]; 1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 1429 entry->rx_queue != rx_queue || 1430 entry->last_frag + 1 != frag) 1431 continue; 1432 1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; 1434 1435 /* 1436 * Check ftype and addresses are equal, else check next fragment 1437 */ 1438 if (((hdr->frame_control ^ f_hdr->frame_control) & 1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || 1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) 1442 continue; 1443 1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 1445 __skb_queue_purge(&entry->skb_list); 1446 continue; 1447 } 1448 return entry; 1449 } 1450 1451 return NULL; 1452 } 1453 1454 static ieee80211_rx_result debug_noinline 1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 1456 { 1457 struct ieee80211_hdr *hdr; 1458 u16 sc; 1459 __le16 fc; 1460 unsigned int frag, seq; 1461 struct ieee80211_fragment_entry *entry; 1462 struct sk_buff *skb; 1463 struct ieee80211_rx_status *status; 1464 1465 hdr = (struct ieee80211_hdr *)rx->skb->data; 1466 fc = hdr->frame_control; 1467 sc = le16_to_cpu(hdr->seq_ctrl); 1468 frag = sc & IEEE80211_SCTL_FRAG; 1469 1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || 1471 (rx->skb)->len < 24 || 1472 is_multicast_ether_addr(hdr->addr1))) { 1473 /* not fragmented */ 1474 goto out; 1475 } 1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 1477 1478 if (skb_linearize(rx->skb)) 1479 return RX_DROP_UNUSABLE; 1480 1481 /* 1482 * skb_linearize() might change the skb->data and 1483 * previously cached variables (in this case, hdr) need to 1484 * be refreshed with the new data. 1485 */ 1486 hdr = (struct ieee80211_hdr *)rx->skb->data; 1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 1488 1489 if (frag == 0) { 1490 /* This is the first fragment of a new frame. */ 1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq, 1492 rx->seqno_idx, &(rx->skb)); 1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && 1494 ieee80211_has_protected(fc)) { 1495 int queue = rx->security_idx; 1496 /* Store CCMP PN so that we can verify that the next 1497 * fragment has a sequential PN value. */ 1498 entry->ccmp = 1; 1499 memcpy(entry->last_pn, 1500 rx->key->u.ccmp.rx_pn[queue], 1501 CCMP_PN_LEN); 1502 } 1503 return RX_QUEUED; 1504 } 1505 1506 /* This is a fragment for a frame that should already be pending in 1507 * fragment cache. Add this fragment to the end of the pending entry. 1508 */ 1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, 1510 rx->seqno_idx, hdr); 1511 if (!entry) { 1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1513 return RX_DROP_MONITOR; 1514 } 1515 1516 /* Verify that MPDUs within one MSDU have sequential PN values. 1517 * (IEEE 802.11i, 8.3.3.4.5) */ 1518 if (entry->ccmp) { 1519 int i; 1520 u8 pn[CCMP_PN_LEN], *rpn; 1521 int queue; 1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) 1523 return RX_DROP_UNUSABLE; 1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN); 1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) { 1526 pn[i]++; 1527 if (pn[i]) 1528 break; 1529 } 1530 queue = rx->security_idx; 1531 rpn = rx->key->u.ccmp.rx_pn[queue]; 1532 if (memcmp(pn, rpn, CCMP_PN_LEN)) 1533 return RX_DROP_UNUSABLE; 1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN); 1535 } 1536 1537 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 1538 __skb_queue_tail(&entry->skb_list, rx->skb); 1539 entry->last_frag = frag; 1540 entry->extra_len += rx->skb->len; 1541 if (ieee80211_has_morefrags(fc)) { 1542 rx->skb = NULL; 1543 return RX_QUEUED; 1544 } 1545 1546 rx->skb = __skb_dequeue(&entry->skb_list); 1547 if (skb_tailroom(rx->skb) < entry->extra_len) { 1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2); 1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 1550 GFP_ATOMIC))) { 1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1552 __skb_queue_purge(&entry->skb_list); 1553 return RX_DROP_UNUSABLE; 1554 } 1555 } 1556 while ((skb = __skb_dequeue(&entry->skb_list))) { 1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); 1558 dev_kfree_skb(skb); 1559 } 1560 1561 /* Complete frame has been reassembled - process it now */ 1562 status = IEEE80211_SKB_RXCB(rx->skb); 1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED; 1564 1565 out: 1566 if (rx->sta) 1567 rx->sta->rx_packets++; 1568 if (is_multicast_ether_addr(hdr->addr1)) 1569 rx->local->dot11MulticastReceivedFrameCount++; 1570 else 1571 ieee80211_led_rx(rx->local); 1572 return RX_CONTINUE; 1573 } 1574 1575 static int 1576 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 1577 { 1578 if (unlikely(!rx->sta || 1579 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) 1580 return -EACCES; 1581 1582 return 0; 1583 } 1584 1585 static int 1586 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 1587 { 1588 struct sk_buff *skb = rx->skb; 1589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1590 1591 /* 1592 * Pass through unencrypted frames if the hardware has 1593 * decrypted them already. 1594 */ 1595 if (status->flag & RX_FLAG_DECRYPTED) 1596 return 0; 1597 1598 /* Drop unencrypted frames if key is set. */ 1599 if (unlikely(!ieee80211_has_protected(fc) && 1600 !ieee80211_is_nullfunc(fc) && 1601 ieee80211_is_data(fc) && 1602 (rx->key || rx->sdata->drop_unencrypted))) 1603 return -EACCES; 1604 1605 return 0; 1606 } 1607 1608 static int 1609 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 1610 { 1611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1613 __le16 fc = hdr->frame_control; 1614 1615 /* 1616 * Pass through unencrypted frames if the hardware has 1617 * decrypted them already. 1618 */ 1619 if (status->flag & RX_FLAG_DECRYPTED) 1620 return 0; 1621 1622 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { 1623 if (unlikely(!ieee80211_has_protected(fc) && 1624 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 1625 rx->key)) { 1626 if (ieee80211_is_deauth(fc)) 1627 cfg80211_send_unprot_deauth(rx->sdata->dev, 1628 rx->skb->data, 1629 rx->skb->len); 1630 else if (ieee80211_is_disassoc(fc)) 1631 cfg80211_send_unprot_disassoc(rx->sdata->dev, 1632 rx->skb->data, 1633 rx->skb->len); 1634 return -EACCES; 1635 } 1636 /* BIP does not use Protected field, so need to check MMIE */ 1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 1638 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 1639 if (ieee80211_is_deauth(fc)) 1640 cfg80211_send_unprot_deauth(rx->sdata->dev, 1641 rx->skb->data, 1642 rx->skb->len); 1643 else if (ieee80211_is_disassoc(fc)) 1644 cfg80211_send_unprot_disassoc(rx->sdata->dev, 1645 rx->skb->data, 1646 rx->skb->len); 1647 return -EACCES; 1648 } 1649 /* 1650 * When using MFP, Action frames are not allowed prior to 1651 * having configured keys. 1652 */ 1653 if (unlikely(ieee80211_is_action(fc) && !rx->key && 1654 ieee80211_is_robust_mgmt_frame( 1655 (struct ieee80211_hdr *) rx->skb->data))) 1656 return -EACCES; 1657 } 1658 1659 return 0; 1660 } 1661 1662 static int 1663 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 1664 { 1665 struct ieee80211_sub_if_data *sdata = rx->sdata; 1666 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1667 bool check_port_control = false; 1668 struct ethhdr *ehdr; 1669 int ret; 1670 1671 *port_control = false; 1672 if (ieee80211_has_a4(hdr->frame_control) && 1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 1674 return -1; 1675 1676 if (sdata->vif.type == NL80211_IFTYPE_STATION && 1677 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 1678 1679 if (!sdata->u.mgd.use_4addr) 1680 return -1; 1681 else 1682 check_port_control = true; 1683 } 1684 1685 if (is_multicast_ether_addr(hdr->addr1) && 1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 1687 return -1; 1688 1689 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 1690 if (ret < 0) 1691 return ret; 1692 1693 ehdr = (struct ethhdr *) rx->skb->data; 1694 if (ehdr->h_proto == rx->sdata->control_port_protocol) 1695 *port_control = true; 1696 else if (check_port_control) 1697 return -1; 1698 1699 return 0; 1700 } 1701 1702 /* 1703 * requires that rx->skb is a frame with ethernet header 1704 */ 1705 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 1706 { 1707 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 1709 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1710 1711 /* 1712 * Allow EAPOL frames to us/the PAE group address regardless 1713 * of whether the frame was encrypted or not. 1714 */ 1715 if (ehdr->h_proto == rx->sdata->control_port_protocol && 1716 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || 1717 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) 1718 return true; 1719 1720 if (ieee80211_802_1x_port_control(rx) || 1721 ieee80211_drop_unencrypted(rx, fc)) 1722 return false; 1723 1724 return true; 1725 } 1726 1727 /* 1728 * requires that rx->skb is a frame with ethernet header 1729 */ 1730 static void 1731 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 1732 { 1733 struct ieee80211_sub_if_data *sdata = rx->sdata; 1734 struct net_device *dev = sdata->dev; 1735 struct sk_buff *skb, *xmit_skb; 1736 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1737 struct sta_info *dsta; 1738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1739 1740 skb = rx->skb; 1741 xmit_skb = NULL; 1742 1743 if ((sdata->vif.type == NL80211_IFTYPE_AP || 1744 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1745 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 1746 (status->rx_flags & IEEE80211_RX_RA_MATCH) && 1747 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 1748 if (is_multicast_ether_addr(ehdr->h_dest)) { 1749 /* 1750 * send multicast frames both to higher layers in 1751 * local net stack and back to the wireless medium 1752 */ 1753 xmit_skb = skb_copy(skb, GFP_ATOMIC); 1754 if (!xmit_skb && net_ratelimit()) 1755 printk(KERN_DEBUG "%s: failed to clone " 1756 "multicast frame\n", dev->name); 1757 } else { 1758 dsta = sta_info_get(sdata, skb->data); 1759 if (dsta) { 1760 /* 1761 * The destination station is associated to 1762 * this AP (in this VLAN), so send the frame 1763 * directly to it and do not pass it to local 1764 * net stack. 1765 */ 1766 xmit_skb = skb; 1767 skb = NULL; 1768 } 1769 } 1770 } 1771 1772 if (skb) { 1773 int align __maybe_unused; 1774 1775 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1776 /* 1777 * 'align' will only take the values 0 or 2 here 1778 * since all frames are required to be aligned 1779 * to 2-byte boundaries when being passed to 1780 * mac80211. That also explains the __skb_push() 1781 * below. 1782 */ 1783 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; 1784 if (align) { 1785 if (WARN_ON(skb_headroom(skb) < 3)) { 1786 dev_kfree_skb(skb); 1787 skb = NULL; 1788 } else { 1789 u8 *data = skb->data; 1790 size_t len = skb_headlen(skb); 1791 skb->data -= align; 1792 memmove(skb->data, data, len); 1793 skb_set_tail_pointer(skb, len); 1794 } 1795 } 1796 #endif 1797 1798 if (skb) { 1799 /* deliver to local stack */ 1800 skb->protocol = eth_type_trans(skb, dev); 1801 memset(skb->cb, 0, sizeof(skb->cb)); 1802 netif_receive_skb(skb); 1803 } 1804 } 1805 1806 if (xmit_skb) { 1807 /* 1808 * Send to wireless media and increase priority by 256 to 1809 * keep the received priority instead of reclassifying 1810 * the frame (see cfg80211_classify8021d). 1811 */ 1812 xmit_skb->priority += 256; 1813 xmit_skb->protocol = htons(ETH_P_802_3); 1814 skb_reset_network_header(xmit_skb); 1815 skb_reset_mac_header(xmit_skb); 1816 dev_queue_xmit(xmit_skb); 1817 } 1818 } 1819 1820 static ieee80211_rx_result debug_noinline 1821 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 1822 { 1823 struct net_device *dev = rx->sdata->dev; 1824 struct sk_buff *skb = rx->skb; 1825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1826 __le16 fc = hdr->frame_control; 1827 struct sk_buff_head frame_list; 1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1829 1830 if (unlikely(!ieee80211_is_data(fc))) 1831 return RX_CONTINUE; 1832 1833 if (unlikely(!ieee80211_is_data_present(fc))) 1834 return RX_DROP_MONITOR; 1835 1836 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 1837 return RX_CONTINUE; 1838 1839 if (ieee80211_has_a4(hdr->frame_control) && 1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1841 !rx->sdata->u.vlan.sta) 1842 return RX_DROP_UNUSABLE; 1843 1844 if (is_multicast_ether_addr(hdr->addr1) && 1845 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1846 rx->sdata->u.vlan.sta) || 1847 (rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1848 rx->sdata->u.mgd.use_4addr))) 1849 return RX_DROP_UNUSABLE; 1850 1851 skb->dev = dev; 1852 __skb_queue_head_init(&frame_list); 1853 1854 if (skb_linearize(skb)) 1855 return RX_DROP_UNUSABLE; 1856 1857 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 1858 rx->sdata->vif.type, 1859 rx->local->hw.extra_tx_headroom, true); 1860 1861 while (!skb_queue_empty(&frame_list)) { 1862 rx->skb = __skb_dequeue(&frame_list); 1863 1864 if (!ieee80211_frame_allowed(rx, fc)) { 1865 dev_kfree_skb(rx->skb); 1866 continue; 1867 } 1868 dev->stats.rx_packets++; 1869 dev->stats.rx_bytes += rx->skb->len; 1870 1871 ieee80211_deliver_skb(rx); 1872 } 1873 1874 return RX_QUEUED; 1875 } 1876 1877 #ifdef CONFIG_MAC80211_MESH 1878 static ieee80211_rx_result 1879 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 1880 { 1881 struct ieee80211_hdr *fwd_hdr, *hdr; 1882 struct ieee80211_tx_info *info; 1883 struct ieee80211s_hdr *mesh_hdr; 1884 struct sk_buff *skb = rx->skb, *fwd_skb; 1885 struct ieee80211_local *local = rx->local; 1886 struct ieee80211_sub_if_data *sdata = rx->sdata; 1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1889 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); 1890 u16 q, hdrlen; 1891 1892 hdr = (struct ieee80211_hdr *) skb->data; 1893 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1894 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1895 1896 /* frame is in RMC, don't forward */ 1897 if (ieee80211_is_data(hdr->frame_control) && 1898 is_multicast_ether_addr(hdr->addr1) && 1899 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata)) 1900 return RX_DROP_MONITOR; 1901 1902 if (!ieee80211_is_data(hdr->frame_control)) 1903 return RX_CONTINUE; 1904 1905 if (!mesh_hdr->ttl) 1906 return RX_DROP_MONITOR; 1907 1908 if (mesh_hdr->flags & MESH_FLAGS_AE) { 1909 struct mesh_path *mppath; 1910 char *proxied_addr; 1911 char *mpp_addr; 1912 1913 if (is_multicast_ether_addr(hdr->addr1)) { 1914 mpp_addr = hdr->addr3; 1915 proxied_addr = mesh_hdr->eaddr1; 1916 } else { 1917 mpp_addr = hdr->addr4; 1918 proxied_addr = mesh_hdr->eaddr2; 1919 } 1920 1921 rcu_read_lock(); 1922 mppath = mpp_path_lookup(proxied_addr, sdata); 1923 if (!mppath) { 1924 mpp_path_add(proxied_addr, mpp_addr, sdata); 1925 } else { 1926 spin_lock_bh(&mppath->state_lock); 1927 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) 1928 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 1929 spin_unlock_bh(&mppath->state_lock); 1930 } 1931 rcu_read_unlock(); 1932 } 1933 1934 /* Frame has reached destination. Don't forward */ 1935 if (!is_multicast_ether_addr(hdr->addr1) && 1936 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) 1937 return RX_CONTINUE; 1938 1939 q = ieee80211_select_queue_80211(local, skb, hdr); 1940 if (ieee80211_queue_stopped(&local->hw, q)) { 1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); 1942 return RX_DROP_MONITOR; 1943 } 1944 skb_set_queue_mapping(skb, q); 1945 1946 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1947 goto out; 1948 1949 if (!--mesh_hdr->ttl) { 1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); 1951 return RX_DROP_MONITOR; 1952 } 1953 1954 fwd_skb = skb_copy(skb, GFP_ATOMIC); 1955 if (!fwd_skb) { 1956 if (net_ratelimit()) 1957 printk(KERN_DEBUG "%s: failed to clone mesh frame\n", 1958 sdata->name); 1959 goto out; 1960 } 1961 1962 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 1963 info = IEEE80211_SKB_CB(fwd_skb); 1964 memset(info, 0, sizeof(*info)); 1965 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1966 info->control.vif = &rx->sdata->vif; 1967 info->control.jiffies = jiffies; 1968 if (is_multicast_ether_addr(fwd_hdr->addr1)) { 1969 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); 1970 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 1971 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) { 1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); 1973 } else { 1974 /* unable to resolve next hop */ 1975 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3, 1976 0, reason, fwd_hdr->addr2, sdata); 1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); 1978 kfree_skb(fwd_skb); 1979 return RX_DROP_MONITOR; 1980 } 1981 1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); 1983 ieee80211_add_pending_skb(local, fwd_skb); 1984 out: 1985 if (is_multicast_ether_addr(hdr->addr1) || 1986 sdata->dev->flags & IFF_PROMISC) 1987 return RX_CONTINUE; 1988 else 1989 return RX_DROP_MONITOR; 1990 } 1991 #endif 1992 1993 static ieee80211_rx_result debug_noinline 1994 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 1995 { 1996 struct ieee80211_sub_if_data *sdata = rx->sdata; 1997 struct ieee80211_local *local = rx->local; 1998 struct net_device *dev = sdata->dev; 1999 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 2000 __le16 fc = hdr->frame_control; 2001 bool port_control; 2002 int err; 2003 2004 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 2005 return RX_CONTINUE; 2006 2007 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 2008 return RX_DROP_MONITOR; 2009 2010 /* 2011 * Send unexpected-4addr-frame event to hostapd. For older versions, 2012 * also drop the frame to cooked monitor interfaces. 2013 */ 2014 if (ieee80211_has_a4(hdr->frame_control) && 2015 sdata->vif.type == NL80211_IFTYPE_AP) { 2016 if (rx->sta && 2017 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) 2018 cfg80211_rx_unexpected_4addr_frame( 2019 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); 2020 return RX_DROP_MONITOR; 2021 } 2022 2023 err = __ieee80211_data_to_8023(rx, &port_control); 2024 if (unlikely(err)) 2025 return RX_DROP_UNUSABLE; 2026 2027 if (!ieee80211_frame_allowed(rx, fc)) 2028 return RX_DROP_MONITOR; 2029 2030 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 2031 unlikely(port_control) && sdata->bss) { 2032 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2033 u.ap); 2034 dev = sdata->dev; 2035 rx->sdata = sdata; 2036 } 2037 2038 rx->skb->dev = dev; 2039 2040 dev->stats.rx_packets++; 2041 dev->stats.rx_bytes += rx->skb->len; 2042 2043 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 2044 !is_multicast_ether_addr( 2045 ((struct ethhdr *)rx->skb->data)->h_dest) && 2046 (!local->scanning && 2047 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { 2048 mod_timer(&local->dynamic_ps_timer, jiffies + 2049 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 2050 } 2051 2052 ieee80211_deliver_skb(rx); 2053 2054 return RX_QUEUED; 2055 } 2056 2057 static ieee80211_rx_result debug_noinline 2058 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) 2059 { 2060 struct ieee80211_local *local = rx->local; 2061 struct ieee80211_hw *hw = &local->hw; 2062 struct sk_buff *skb = rx->skb; 2063 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 2064 struct tid_ampdu_rx *tid_agg_rx; 2065 u16 start_seq_num; 2066 u16 tid; 2067 2068 if (likely(!ieee80211_is_ctl(bar->frame_control))) 2069 return RX_CONTINUE; 2070 2071 if (ieee80211_is_back_req(bar->frame_control)) { 2072 struct { 2073 __le16 control, start_seq_num; 2074 } __packed bar_data; 2075 2076 if (!rx->sta) 2077 return RX_DROP_MONITOR; 2078 2079 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 2080 &bar_data, sizeof(bar_data))) 2081 return RX_DROP_MONITOR; 2082 2083 tid = le16_to_cpu(bar_data.control) >> 12; 2084 2085 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 2086 if (!tid_agg_rx) 2087 return RX_DROP_MONITOR; 2088 2089 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 2090 2091 /* reset session timer */ 2092 if (tid_agg_rx->timeout) 2093 mod_timer(&tid_agg_rx->session_timer, 2094 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 2095 2096 spin_lock(&tid_agg_rx->reorder_lock); 2097 /* release stored frames up to start of BAR */ 2098 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); 2099 spin_unlock(&tid_agg_rx->reorder_lock); 2100 2101 kfree_skb(skb); 2102 return RX_QUEUED; 2103 } 2104 2105 /* 2106 * After this point, we only want management frames, 2107 * so we can drop all remaining control frames to 2108 * cooked monitor interfaces. 2109 */ 2110 return RX_DROP_MONITOR; 2111 } 2112 2113 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 2114 struct ieee80211_mgmt *mgmt, 2115 size_t len) 2116 { 2117 struct ieee80211_local *local = sdata->local; 2118 struct sk_buff *skb; 2119 struct ieee80211_mgmt *resp; 2120 2121 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { 2122 /* Not to own unicast address */ 2123 return; 2124 } 2125 2126 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || 2127 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { 2128 /* Not from the current AP or not associated yet. */ 2129 return; 2130 } 2131 2132 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 2133 /* Too short SA Query request frame */ 2134 return; 2135 } 2136 2137 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 2138 if (skb == NULL) 2139 return; 2140 2141 skb_reserve(skb, local->hw.extra_tx_headroom); 2142 resp = (struct ieee80211_mgmt *) skb_put(skb, 24); 2143 memset(resp, 0, 24); 2144 memcpy(resp->da, mgmt->sa, ETH_ALEN); 2145 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 2146 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 2147 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2148 IEEE80211_STYPE_ACTION); 2149 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 2150 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 2151 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 2152 memcpy(resp->u.action.u.sa_query.trans_id, 2153 mgmt->u.action.u.sa_query.trans_id, 2154 WLAN_SA_QUERY_TR_ID_LEN); 2155 2156 ieee80211_tx_skb(sdata, skb); 2157 } 2158 2159 static ieee80211_rx_result debug_noinline 2160 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 2161 { 2162 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2164 2165 /* 2166 * From here on, look only at management frames. 2167 * Data and control frames are already handled, 2168 * and unknown (reserved) frames are useless. 2169 */ 2170 if (rx->skb->len < 24) 2171 return RX_DROP_MONITOR; 2172 2173 if (!ieee80211_is_mgmt(mgmt->frame_control)) 2174 return RX_DROP_MONITOR; 2175 2176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && 2177 ieee80211_is_beacon(mgmt->frame_control) && 2178 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { 2179 cfg80211_report_obss_beacon(rx->local->hw.wiphy, 2180 rx->skb->data, rx->skb->len, 2181 status->freq, GFP_ATOMIC); 2182 rx->flags |= IEEE80211_RX_BEACON_REPORTED; 2183 } 2184 2185 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2186 return RX_DROP_MONITOR; 2187 2188 if (ieee80211_drop_unencrypted_mgmt(rx)) 2189 return RX_DROP_UNUSABLE; 2190 2191 return RX_CONTINUE; 2192 } 2193 2194 static ieee80211_rx_result debug_noinline 2195 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 2196 { 2197 struct ieee80211_local *local = rx->local; 2198 struct ieee80211_sub_if_data *sdata = rx->sdata; 2199 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2200 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2201 int len = rx->skb->len; 2202 2203 if (!ieee80211_is_action(mgmt->frame_control)) 2204 return RX_CONTINUE; 2205 2206 /* drop too small frames */ 2207 if (len < IEEE80211_MIN_ACTION_SIZE) 2208 return RX_DROP_UNUSABLE; 2209 2210 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) 2211 return RX_DROP_UNUSABLE; 2212 2213 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2214 return RX_DROP_UNUSABLE; 2215 2216 switch (mgmt->u.action.category) { 2217 case WLAN_CATEGORY_HT: 2218 /* reject HT action frames from stations not supporting HT */ 2219 if (!rx->sta->sta.ht_cap.ht_supported) 2220 goto invalid; 2221 2222 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2223 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2224 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2225 sdata->vif.type != NL80211_IFTYPE_AP && 2226 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2227 break; 2228 2229 /* verify action & smps_control are present */ 2230 if (len < IEEE80211_MIN_ACTION_SIZE + 2) 2231 goto invalid; 2232 2233 switch (mgmt->u.action.u.ht_smps.action) { 2234 case WLAN_HT_ACTION_SMPS: { 2235 struct ieee80211_supported_band *sband; 2236 u8 smps; 2237 2238 /* convert to HT capability */ 2239 switch (mgmt->u.action.u.ht_smps.smps_control) { 2240 case WLAN_HT_SMPS_CONTROL_DISABLED: 2241 smps = WLAN_HT_CAP_SM_PS_DISABLED; 2242 break; 2243 case WLAN_HT_SMPS_CONTROL_STATIC: 2244 smps = WLAN_HT_CAP_SM_PS_STATIC; 2245 break; 2246 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 2247 smps = WLAN_HT_CAP_SM_PS_DYNAMIC; 2248 break; 2249 default: 2250 goto invalid; 2251 } 2252 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT; 2253 2254 /* if no change do nothing */ 2255 if ((rx->sta->sta.ht_cap.cap & 2256 IEEE80211_HT_CAP_SM_PS) == smps) 2257 goto handled; 2258 2259 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS; 2260 rx->sta->sta.ht_cap.cap |= smps; 2261 2262 sband = rx->local->hw.wiphy->bands[status->band]; 2263 2264 rate_control_rate_update(local, sband, rx->sta, 2265 IEEE80211_RC_SMPS_CHANGED, 2266 local->_oper_channel_type); 2267 goto handled; 2268 } 2269 default: 2270 goto invalid; 2271 } 2272 2273 break; 2274 case WLAN_CATEGORY_BACK: 2275 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2276 sdata->vif.type != NL80211_IFTYPE_MESH_POINT && 2277 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2278 sdata->vif.type != NL80211_IFTYPE_AP && 2279 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2280 break; 2281 2282 /* verify action_code is present */ 2283 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2284 break; 2285 2286 switch (mgmt->u.action.u.addba_req.action_code) { 2287 case WLAN_ACTION_ADDBA_REQ: 2288 if (len < (IEEE80211_MIN_ACTION_SIZE + 2289 sizeof(mgmt->u.action.u.addba_req))) 2290 goto invalid; 2291 break; 2292 case WLAN_ACTION_ADDBA_RESP: 2293 if (len < (IEEE80211_MIN_ACTION_SIZE + 2294 sizeof(mgmt->u.action.u.addba_resp))) 2295 goto invalid; 2296 break; 2297 case WLAN_ACTION_DELBA: 2298 if (len < (IEEE80211_MIN_ACTION_SIZE + 2299 sizeof(mgmt->u.action.u.delba))) 2300 goto invalid; 2301 break; 2302 default: 2303 goto invalid; 2304 } 2305 2306 goto queue; 2307 case WLAN_CATEGORY_SPECTRUM_MGMT: 2308 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) 2309 break; 2310 2311 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2312 break; 2313 2314 /* verify action_code is present */ 2315 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2316 break; 2317 2318 switch (mgmt->u.action.u.measurement.action_code) { 2319 case WLAN_ACTION_SPCT_MSR_REQ: 2320 if (len < (IEEE80211_MIN_ACTION_SIZE + 2321 sizeof(mgmt->u.action.u.measurement))) 2322 break; 2323 ieee80211_process_measurement_req(sdata, mgmt, len); 2324 goto handled; 2325 case WLAN_ACTION_SPCT_CHL_SWITCH: 2326 if (len < (IEEE80211_MIN_ACTION_SIZE + 2327 sizeof(mgmt->u.action.u.chan_switch))) 2328 break; 2329 2330 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2331 break; 2332 2333 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) 2334 break; 2335 2336 goto queue; 2337 } 2338 break; 2339 case WLAN_CATEGORY_SA_QUERY: 2340 if (len < (IEEE80211_MIN_ACTION_SIZE + 2341 sizeof(mgmt->u.action.u.sa_query))) 2342 break; 2343 2344 switch (mgmt->u.action.u.sa_query.action) { 2345 case WLAN_ACTION_SA_QUERY_REQUEST: 2346 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2347 break; 2348 ieee80211_process_sa_query_req(sdata, mgmt, len); 2349 goto handled; 2350 } 2351 break; 2352 case WLAN_CATEGORY_SELF_PROTECTED: 2353 switch (mgmt->u.action.u.self_prot.action_code) { 2354 case WLAN_SP_MESH_PEERING_OPEN: 2355 case WLAN_SP_MESH_PEERING_CLOSE: 2356 case WLAN_SP_MESH_PEERING_CONFIRM: 2357 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2358 goto invalid; 2359 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE) 2360 /* userspace handles this frame */ 2361 break; 2362 goto queue; 2363 case WLAN_SP_MGK_INFORM: 2364 case WLAN_SP_MGK_ACK: 2365 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2366 goto invalid; 2367 break; 2368 } 2369 break; 2370 case WLAN_CATEGORY_MESH_ACTION: 2371 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2372 break; 2373 if (mesh_action_is_path_sel(mgmt) && 2374 (!mesh_path_sel_is_hwmp(sdata))) 2375 break; 2376 goto queue; 2377 } 2378 2379 return RX_CONTINUE; 2380 2381 invalid: 2382 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 2383 /* will return in the next handlers */ 2384 return RX_CONTINUE; 2385 2386 handled: 2387 if (rx->sta) 2388 rx->sta->rx_packets++; 2389 dev_kfree_skb(rx->skb); 2390 return RX_QUEUED; 2391 2392 queue: 2393 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2394 skb_queue_tail(&sdata->skb_queue, rx->skb); 2395 ieee80211_queue_work(&local->hw, &sdata->work); 2396 if (rx->sta) 2397 rx->sta->rx_packets++; 2398 return RX_QUEUED; 2399 } 2400 2401 static ieee80211_rx_result debug_noinline 2402 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 2403 { 2404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2405 2406 /* skip known-bad action frames and return them in the next handler */ 2407 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 2408 return RX_CONTINUE; 2409 2410 /* 2411 * Getting here means the kernel doesn't know how to handle 2412 * it, but maybe userspace does ... include returned frames 2413 * so userspace can register for those to know whether ones 2414 * it transmitted were processed or returned. 2415 */ 2416 2417 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, 2418 rx->skb->data, rx->skb->len, 2419 GFP_ATOMIC)) { 2420 if (rx->sta) 2421 rx->sta->rx_packets++; 2422 dev_kfree_skb(rx->skb); 2423 return RX_QUEUED; 2424 } 2425 2426 2427 return RX_CONTINUE; 2428 } 2429 2430 static ieee80211_rx_result debug_noinline 2431 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 2432 { 2433 struct ieee80211_local *local = rx->local; 2434 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2435 struct sk_buff *nskb; 2436 struct ieee80211_sub_if_data *sdata = rx->sdata; 2437 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2438 2439 if (!ieee80211_is_action(mgmt->frame_control)) 2440 return RX_CONTINUE; 2441 2442 /* 2443 * For AP mode, hostapd is responsible for handling any action 2444 * frames that we didn't handle, including returning unknown 2445 * ones. For all other modes we will return them to the sender, 2446 * setting the 0x80 bit in the action category, as required by 2447 * 802.11-2007 7.3.1.11. 2448 * Newer versions of hostapd shall also use the management frame 2449 * registration mechanisms, but older ones still use cooked 2450 * monitor interfaces so push all frames there. 2451 */ 2452 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 2453 (sdata->vif.type == NL80211_IFTYPE_AP || 2454 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 2455 return RX_DROP_MONITOR; 2456 2457 /* do not return rejected action frames */ 2458 if (mgmt->u.action.category & 0x80) 2459 return RX_DROP_UNUSABLE; 2460 2461 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 2462 GFP_ATOMIC); 2463 if (nskb) { 2464 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 2465 2466 nmgmt->u.action.category |= 0x80; 2467 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 2468 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 2469 2470 memset(nskb->cb, 0, sizeof(nskb->cb)); 2471 2472 ieee80211_tx_skb(rx->sdata, nskb); 2473 } 2474 dev_kfree_skb(rx->skb); 2475 return RX_QUEUED; 2476 } 2477 2478 static ieee80211_rx_result debug_noinline 2479 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 2480 { 2481 struct ieee80211_sub_if_data *sdata = rx->sdata; 2482 ieee80211_rx_result rxs; 2483 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2484 __le16 stype; 2485 2486 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); 2487 if (rxs != RX_CONTINUE) 2488 return rxs; 2489 2490 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 2491 2492 if (!ieee80211_vif_is_mesh(&sdata->vif) && 2493 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2494 sdata->vif.type != NL80211_IFTYPE_STATION) 2495 return RX_DROP_MONITOR; 2496 2497 switch (stype) { 2498 case cpu_to_le16(IEEE80211_STYPE_BEACON): 2499 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 2500 /* process for all: mesh, mlme, ibss */ 2501 break; 2502 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 2503 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 2504 if (is_multicast_ether_addr(mgmt->da) && 2505 !is_broadcast_ether_addr(mgmt->da)) 2506 return RX_DROP_MONITOR; 2507 2508 /* process only for station */ 2509 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2510 return RX_DROP_MONITOR; 2511 break; 2512 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 2513 case cpu_to_le16(IEEE80211_STYPE_AUTH): 2514 /* process only for ibss */ 2515 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 2516 return RX_DROP_MONITOR; 2517 break; 2518 default: 2519 return RX_DROP_MONITOR; 2520 } 2521 2522 /* queue up frame and kick off work to process it */ 2523 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2524 skb_queue_tail(&sdata->skb_queue, rx->skb); 2525 ieee80211_queue_work(&rx->local->hw, &sdata->work); 2526 if (rx->sta) 2527 rx->sta->rx_packets++; 2528 2529 return RX_QUEUED; 2530 } 2531 2532 /* TODO: use IEEE80211_RX_FRAGMENTED */ 2533 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 2534 struct ieee80211_rate *rate) 2535 { 2536 struct ieee80211_sub_if_data *sdata; 2537 struct ieee80211_local *local = rx->local; 2538 struct ieee80211_rtap_hdr { 2539 struct ieee80211_radiotap_header hdr; 2540 u8 flags; 2541 u8 rate_or_pad; 2542 __le16 chan_freq; 2543 __le16 chan_flags; 2544 } __packed *rthdr; 2545 struct sk_buff *skb = rx->skb, *skb2; 2546 struct net_device *prev_dev = NULL; 2547 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2548 2549 /* 2550 * If cooked monitor has been processed already, then 2551 * don't do it again. If not, set the flag. 2552 */ 2553 if (rx->flags & IEEE80211_RX_CMNTR) 2554 goto out_free_skb; 2555 rx->flags |= IEEE80211_RX_CMNTR; 2556 2557 /* If there are no cooked monitor interfaces, just free the SKB */ 2558 if (!local->cooked_mntrs) 2559 goto out_free_skb; 2560 2561 if (skb_headroom(skb) < sizeof(*rthdr) && 2562 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) 2563 goto out_free_skb; 2564 2565 rthdr = (void *)skb_push(skb, sizeof(*rthdr)); 2566 memset(rthdr, 0, sizeof(*rthdr)); 2567 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 2568 rthdr->hdr.it_present = 2569 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | 2570 (1 << IEEE80211_RADIOTAP_CHANNEL)); 2571 2572 if (rate) { 2573 rthdr->rate_or_pad = rate->bitrate / 5; 2574 rthdr->hdr.it_present |= 2575 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 2576 } 2577 rthdr->chan_freq = cpu_to_le16(status->freq); 2578 2579 if (status->band == IEEE80211_BAND_5GHZ) 2580 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | 2581 IEEE80211_CHAN_5GHZ); 2582 else 2583 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | 2584 IEEE80211_CHAN_2GHZ); 2585 2586 skb_set_mac_header(skb, 0); 2587 skb->ip_summed = CHECKSUM_UNNECESSARY; 2588 skb->pkt_type = PACKET_OTHERHOST; 2589 skb->protocol = htons(ETH_P_802_2); 2590 2591 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2592 if (!ieee80211_sdata_running(sdata)) 2593 continue; 2594 2595 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 2596 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) 2597 continue; 2598 2599 if (prev_dev) { 2600 skb2 = skb_clone(skb, GFP_ATOMIC); 2601 if (skb2) { 2602 skb2->dev = prev_dev; 2603 netif_receive_skb(skb2); 2604 } 2605 } 2606 2607 prev_dev = sdata->dev; 2608 sdata->dev->stats.rx_packets++; 2609 sdata->dev->stats.rx_bytes += skb->len; 2610 } 2611 2612 if (prev_dev) { 2613 skb->dev = prev_dev; 2614 netif_receive_skb(skb); 2615 return; 2616 } 2617 2618 out_free_skb: 2619 dev_kfree_skb(skb); 2620 } 2621 2622 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 2623 ieee80211_rx_result res) 2624 { 2625 switch (res) { 2626 case RX_DROP_MONITOR: 2627 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2628 if (rx->sta) 2629 rx->sta->rx_dropped++; 2630 /* fall through */ 2631 case RX_CONTINUE: { 2632 struct ieee80211_rate *rate = NULL; 2633 struct ieee80211_supported_band *sband; 2634 struct ieee80211_rx_status *status; 2635 2636 status = IEEE80211_SKB_RXCB((rx->skb)); 2637 2638 sband = rx->local->hw.wiphy->bands[status->band]; 2639 if (!(status->flag & RX_FLAG_HT)) 2640 rate = &sband->bitrates[status->rate_idx]; 2641 2642 ieee80211_rx_cooked_monitor(rx, rate); 2643 break; 2644 } 2645 case RX_DROP_UNUSABLE: 2646 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2647 if (rx->sta) 2648 rx->sta->rx_dropped++; 2649 dev_kfree_skb(rx->skb); 2650 break; 2651 case RX_QUEUED: 2652 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 2653 break; 2654 } 2655 } 2656 2657 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) 2658 { 2659 ieee80211_rx_result res = RX_DROP_MONITOR; 2660 struct sk_buff *skb; 2661 2662 #define CALL_RXH(rxh) \ 2663 do { \ 2664 res = rxh(rx); \ 2665 if (res != RX_CONTINUE) \ 2666 goto rxh_next; \ 2667 } while (0); 2668 2669 spin_lock(&rx->local->rx_skb_queue.lock); 2670 if (rx->local->running_rx_handler) 2671 goto unlock; 2672 2673 rx->local->running_rx_handler = true; 2674 2675 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { 2676 spin_unlock(&rx->local->rx_skb_queue.lock); 2677 2678 /* 2679 * all the other fields are valid across frames 2680 * that belong to an aMPDU since they are on the 2681 * same TID from the same station 2682 */ 2683 rx->skb = skb; 2684 2685 CALL_RXH(ieee80211_rx_h_decrypt) 2686 CALL_RXH(ieee80211_rx_h_check_more_data) 2687 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) 2688 CALL_RXH(ieee80211_rx_h_sta_process) 2689 CALL_RXH(ieee80211_rx_h_defragment) 2690 CALL_RXH(ieee80211_rx_h_michael_mic_verify) 2691 /* must be after MMIC verify so header is counted in MPDU mic */ 2692 #ifdef CONFIG_MAC80211_MESH 2693 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 2694 CALL_RXH(ieee80211_rx_h_mesh_fwding); 2695 #endif 2696 CALL_RXH(ieee80211_rx_h_amsdu) 2697 CALL_RXH(ieee80211_rx_h_data) 2698 CALL_RXH(ieee80211_rx_h_ctrl); 2699 CALL_RXH(ieee80211_rx_h_mgmt_check) 2700 CALL_RXH(ieee80211_rx_h_action) 2701 CALL_RXH(ieee80211_rx_h_userspace_mgmt) 2702 CALL_RXH(ieee80211_rx_h_action_return) 2703 CALL_RXH(ieee80211_rx_h_mgmt) 2704 2705 rxh_next: 2706 ieee80211_rx_handlers_result(rx, res); 2707 spin_lock(&rx->local->rx_skb_queue.lock); 2708 #undef CALL_RXH 2709 } 2710 2711 rx->local->running_rx_handler = false; 2712 2713 unlock: 2714 spin_unlock(&rx->local->rx_skb_queue.lock); 2715 } 2716 2717 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 2718 { 2719 ieee80211_rx_result res = RX_DROP_MONITOR; 2720 2721 #define CALL_RXH(rxh) \ 2722 do { \ 2723 res = rxh(rx); \ 2724 if (res != RX_CONTINUE) \ 2725 goto rxh_next; \ 2726 } while (0); 2727 2728 CALL_RXH(ieee80211_rx_h_passive_scan) 2729 CALL_RXH(ieee80211_rx_h_check) 2730 2731 ieee80211_rx_reorder_ampdu(rx); 2732 2733 ieee80211_rx_handlers(rx); 2734 return; 2735 2736 rxh_next: 2737 ieee80211_rx_handlers_result(rx, res); 2738 2739 #undef CALL_RXH 2740 } 2741 2742 /* 2743 * This function makes calls into the RX path, therefore 2744 * it has to be invoked under RCU read lock. 2745 */ 2746 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 2747 { 2748 struct ieee80211_rx_data rx = { 2749 .sta = sta, 2750 .sdata = sta->sdata, 2751 .local = sta->local, 2752 /* This is OK -- must be QoS data frame */ 2753 .security_idx = tid, 2754 .seqno_idx = tid, 2755 .flags = 0, 2756 }; 2757 struct tid_ampdu_rx *tid_agg_rx; 2758 2759 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 2760 if (!tid_agg_rx) 2761 return; 2762 2763 spin_lock(&tid_agg_rx->reorder_lock); 2764 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); 2765 spin_unlock(&tid_agg_rx->reorder_lock); 2766 2767 ieee80211_rx_handlers(&rx); 2768 } 2769 2770 /* main receive path */ 2771 2772 static int prepare_for_handlers(struct ieee80211_rx_data *rx, 2773 struct ieee80211_hdr *hdr) 2774 { 2775 struct ieee80211_sub_if_data *sdata = rx->sdata; 2776 struct sk_buff *skb = rx->skb; 2777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2778 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 2779 int multicast = is_multicast_ether_addr(hdr->addr1); 2780 2781 switch (sdata->vif.type) { 2782 case NL80211_IFTYPE_STATION: 2783 if (!bssid && !sdata->u.mgd.use_4addr) 2784 return 0; 2785 if (!multicast && 2786 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { 2787 if (!(sdata->dev->flags & IFF_PROMISC) || 2788 sdata->u.mgd.use_4addr) 2789 return 0; 2790 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2791 } 2792 break; 2793 case NL80211_IFTYPE_ADHOC: 2794 if (!bssid) 2795 return 0; 2796 if (ieee80211_is_beacon(hdr->frame_control)) { 2797 return 1; 2798 } 2799 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { 2800 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) 2801 return 0; 2802 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2803 } else if (!multicast && 2804 compare_ether_addr(sdata->vif.addr, 2805 hdr->addr1) != 0) { 2806 if (!(sdata->dev->flags & IFF_PROMISC)) 2807 return 0; 2808 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2809 } else if (!rx->sta) { 2810 int rate_idx; 2811 if (status->flag & RX_FLAG_HT) 2812 rate_idx = 0; /* TODO: HT rates */ 2813 else 2814 rate_idx = status->rate_idx; 2815 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, 2816 BIT(rate_idx)); 2817 } 2818 break; 2819 case NL80211_IFTYPE_MESH_POINT: 2820 if (!multicast && 2821 compare_ether_addr(sdata->vif.addr, 2822 hdr->addr1) != 0) { 2823 if (!(sdata->dev->flags & IFF_PROMISC)) 2824 return 0; 2825 2826 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2827 } 2828 break; 2829 case NL80211_IFTYPE_AP_VLAN: 2830 case NL80211_IFTYPE_AP: 2831 if (!bssid) { 2832 if (compare_ether_addr(sdata->vif.addr, 2833 hdr->addr1)) 2834 return 0; 2835 } else if (!ieee80211_bssid_match(bssid, 2836 sdata->vif.addr)) { 2837 /* 2838 * Accept public action frames even when the 2839 * BSSID doesn't match, this is used for P2P 2840 * and location updates. Note that mac80211 2841 * itself never looks at these frames. 2842 */ 2843 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && 2844 ieee80211_is_public_action(hdr, skb->len)) 2845 return 1; 2846 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && 2847 !ieee80211_is_beacon(hdr->frame_control)) 2848 return 0; 2849 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2850 } 2851 break; 2852 case NL80211_IFTYPE_WDS: 2853 if (bssid || !ieee80211_is_data(hdr->frame_control)) 2854 return 0; 2855 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) 2856 return 0; 2857 break; 2858 default: 2859 /* should never get here */ 2860 WARN_ON(1); 2861 break; 2862 } 2863 2864 return 1; 2865 } 2866 2867 /* 2868 * This function returns whether or not the SKB 2869 * was destined for RX processing or not, which, 2870 * if consume is true, is equivalent to whether 2871 * or not the skb was consumed. 2872 */ 2873 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 2874 struct sk_buff *skb, bool consume) 2875 { 2876 struct ieee80211_local *local = rx->local; 2877 struct ieee80211_sub_if_data *sdata = rx->sdata; 2878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2879 struct ieee80211_hdr *hdr = (void *)skb->data; 2880 int prepares; 2881 2882 rx->skb = skb; 2883 status->rx_flags |= IEEE80211_RX_RA_MATCH; 2884 prepares = prepare_for_handlers(rx, hdr); 2885 2886 if (!prepares) 2887 return false; 2888 2889 if (!consume) { 2890 skb = skb_copy(skb, GFP_ATOMIC); 2891 if (!skb) { 2892 if (net_ratelimit()) 2893 wiphy_debug(local->hw.wiphy, 2894 "failed to copy skb for %s\n", 2895 sdata->name); 2896 return true; 2897 } 2898 2899 rx->skb = skb; 2900 } 2901 2902 ieee80211_invoke_rx_handlers(rx); 2903 return true; 2904 } 2905 2906 /* 2907 * This is the actual Rx frames handler. as it blongs to Rx path it must 2908 * be called with rcu_read_lock protection. 2909 */ 2910 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 2911 struct sk_buff *skb) 2912 { 2913 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2914 struct ieee80211_local *local = hw_to_local(hw); 2915 struct ieee80211_sub_if_data *sdata; 2916 struct ieee80211_hdr *hdr; 2917 __le16 fc; 2918 struct ieee80211_rx_data rx; 2919 struct ieee80211_sub_if_data *prev; 2920 struct sta_info *sta, *tmp, *prev_sta; 2921 int err = 0; 2922 2923 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 2924 memset(&rx, 0, sizeof(rx)); 2925 rx.skb = skb; 2926 rx.local = local; 2927 2928 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 2929 local->dot11ReceivedFragmentCount++; 2930 2931 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || 2932 test_bit(SCAN_SW_SCANNING, &local->scanning))) 2933 status->rx_flags |= IEEE80211_RX_IN_SCAN; 2934 2935 if (ieee80211_is_mgmt(fc)) 2936 err = skb_linearize(skb); 2937 else 2938 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 2939 2940 if (err) { 2941 dev_kfree_skb(skb); 2942 return; 2943 } 2944 2945 hdr = (struct ieee80211_hdr *)skb->data; 2946 ieee80211_parse_qos(&rx); 2947 ieee80211_verify_alignment(&rx); 2948 2949 if (ieee80211_is_data(fc)) { 2950 prev_sta = NULL; 2951 2952 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) { 2953 if (!prev_sta) { 2954 prev_sta = sta; 2955 continue; 2956 } 2957 2958 rx.sta = prev_sta; 2959 rx.sdata = prev_sta->sdata; 2960 ieee80211_prepare_and_rx_handle(&rx, skb, false); 2961 2962 prev_sta = sta; 2963 } 2964 2965 if (prev_sta) { 2966 rx.sta = prev_sta; 2967 rx.sdata = prev_sta->sdata; 2968 2969 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 2970 return; 2971 goto out; 2972 } 2973 } 2974 2975 prev = NULL; 2976 2977 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2978 if (!ieee80211_sdata_running(sdata)) 2979 continue; 2980 2981 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 2982 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2983 continue; 2984 2985 /* 2986 * frame is destined for this interface, but if it's 2987 * not also for the previous one we handle that after 2988 * the loop to avoid copying the SKB once too much 2989 */ 2990 2991 if (!prev) { 2992 prev = sdata; 2993 continue; 2994 } 2995 2996 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2); 2997 rx.sdata = prev; 2998 ieee80211_prepare_and_rx_handle(&rx, skb, false); 2999 3000 prev = sdata; 3001 } 3002 3003 if (prev) { 3004 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2); 3005 rx.sdata = prev; 3006 3007 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 3008 return; 3009 } 3010 3011 out: 3012 dev_kfree_skb(skb); 3013 } 3014 3015 /* 3016 * This is the receive path handler. It is called by a low level driver when an 3017 * 802.11 MPDU is received from the hardware. 3018 */ 3019 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) 3020 { 3021 struct ieee80211_local *local = hw_to_local(hw); 3022 struct ieee80211_rate *rate = NULL; 3023 struct ieee80211_supported_band *sband; 3024 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 3025 3026 WARN_ON_ONCE(softirq_count() == 0); 3027 3028 if (WARN_ON(status->band < 0 || 3029 status->band >= IEEE80211_NUM_BANDS)) 3030 goto drop; 3031 3032 sband = local->hw.wiphy->bands[status->band]; 3033 if (WARN_ON(!sband)) 3034 goto drop; 3035 3036 /* 3037 * If we're suspending, it is possible although not too likely 3038 * that we'd be receiving frames after having already partially 3039 * quiesced the stack. We can't process such frames then since 3040 * that might, for example, cause stations to be added or other 3041 * driver callbacks be invoked. 3042 */ 3043 if (unlikely(local->quiescing || local->suspended)) 3044 goto drop; 3045 3046 /* 3047 * The same happens when we're not even started, 3048 * but that's worth a warning. 3049 */ 3050 if (WARN_ON(!local->started)) 3051 goto drop; 3052 3053 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 3054 /* 3055 * Validate the rate, unless a PLCP error means that 3056 * we probably can't have a valid rate here anyway. 3057 */ 3058 3059 if (status->flag & RX_FLAG_HT) { 3060 /* 3061 * rate_idx is MCS index, which can be [0-76] 3062 * as documented on: 3063 * 3064 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 3065 * 3066 * Anything else would be some sort of driver or 3067 * hardware error. The driver should catch hardware 3068 * errors. 3069 */ 3070 if (WARN((status->rate_idx < 0 || 3071 status->rate_idx > 76), 3072 "Rate marked as an HT rate but passed " 3073 "status->rate_idx is not " 3074 "an MCS index [0-76]: %d (0x%02x)\n", 3075 status->rate_idx, 3076 status->rate_idx)) 3077 goto drop; 3078 } else { 3079 if (WARN_ON(status->rate_idx < 0 || 3080 status->rate_idx >= sband->n_bitrates)) 3081 goto drop; 3082 rate = &sband->bitrates[status->rate_idx]; 3083 } 3084 } 3085 3086 status->rx_flags = 0; 3087 3088 /* 3089 * key references and virtual interfaces are protected using RCU 3090 * and this requires that we are in a read-side RCU section during 3091 * receive processing 3092 */ 3093 rcu_read_lock(); 3094 3095 /* 3096 * Frames with failed FCS/PLCP checksum are not returned, 3097 * all other frames are returned without radiotap header 3098 * if it was previously present. 3099 * Also, frames with less than 16 bytes are dropped. 3100 */ 3101 skb = ieee80211_rx_monitor(local, skb, rate); 3102 if (!skb) { 3103 rcu_read_unlock(); 3104 return; 3105 } 3106 3107 ieee80211_tpt_led_trig_rx(local, 3108 ((struct ieee80211_hdr *)skb->data)->frame_control, 3109 skb->len); 3110 __ieee80211_rx_handle_packet(hw, skb); 3111 3112 rcu_read_unlock(); 3113 3114 return; 3115 drop: 3116 kfree_skb(skb); 3117 } 3118 EXPORT_SYMBOL(ieee80211_rx); 3119 3120 /* This is a version of the rx handler that can be called from hard irq 3121 * context. Post the skb on the queue and schedule the tasklet */ 3122 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 3123 { 3124 struct ieee80211_local *local = hw_to_local(hw); 3125 3126 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 3127 3128 skb->pkt_type = IEEE80211_RX_MSG; 3129 skb_queue_tail(&local->skb_queue, skb); 3130 tasklet_schedule(&local->tasklet); 3131 } 3132 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 3133